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Commit 442f04c3 authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Ingo Molnar
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objtool: Add tool to perform compile-time stack metadata validation 

This adds a host tool named objtool which has a "check" subcommand which
analyzes .o files to ensure the validity of stack metadata.  It enforces
a set of rules on asm code and C inline assembly code so that stack
traces can be reliable.

For each function, it recursively follows all possible code paths and
validates the correct frame pointer state at each instruction.

It also follows code paths involving kernel special sections, like
.altinstructions, __jump_table, and __ex_table, which can add
alternative execution paths to a given instruction (or set of
instructions).  Similarly, it knows how to follow switch statements, for
which gcc sometimes uses jump tables.

Here are some of the benefits of validating stack metadata:

a) More reliable stack traces for frame pointer enabled kernels

   Frame pointers are used for debugging purposes.  They allow runtime
   code and debug tools to be able to walk the stack to determine the
   chain of function call sites that led to the currently executing
   code.

   For some architectures, frame pointers are enabled by
   CONFIG_FRAME_POINTER.  For some other architectures they may be
   required by the ABI (sometimes referred to as "backchain pointers").

   For C code, gcc automatically generates instructions for setting up
   frame pointers when the -fno-omit-frame-pointer option is used.

   But for asm code, the frame setup instructions have to be written by
   hand, which most people don't do.  So the end result is that
   CONFIG_FRAME_POINTER is honored for C code but not for most asm code.

   For stack traces based on frame pointers to be reliable, all
   functions which call other functions must first create a stack frame
   and update the frame pointer.  If a first function doesn't properly
   create a stack frame before calling a second function, the *caller*
   of the first function will be skipped on the stack trace.

   For example, consider the following example backtrace with frame
   pointers enabled:

     [<ffffffff81812584>] dump_stack+0x4b/0x63
     [<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
     [<ffffffff8127f568>] seq_read+0x108/0x3e0
     [<ffffffff812cce62>] proc_reg_read+0x42/0x70
     [<ffffffff81256197>] __vfs_read+0x37/0x100
     [<ffffffff81256b16>] vfs_read+0x86/0x130
     [<ffffffff81257898>] SyS_read+0x58/0xd0
     [<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76

   It correctly shows that the caller of cmdline_proc_show() is
   seq_read().

   If we remove the frame pointer logic from cmdline_proc_show() by
   replacing the frame pointer related instructions with nops, here's
   what it looks like instead:

     [<ffffffff81812584>] dump_stack+0x4b/0x63
     [<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
     [<ffffffff812cce62>] proc_reg_read+0x42/0x70
     [<ffffffff81256197>] __vfs_read+0x37/0x100
     [<ffffffff81256b16>] vfs_read+0x86/0x130
     [<ffffffff81257898>] SyS_read+0x58/0xd0
     [<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76

   Notice that cmdline_proc_show()'s caller, seq_read(), has been
   skipped.  Instead the stack trace seems to show that
   cmdline_proc_show() was called by proc_reg_read().

   The benefit of "objtool check" here is that because it ensures that
   *all* functions honor CONFIG_FRAME_POINTER, no functions will ever[*]
   be skipped on a stack trace.

   [*] unless an interrupt or exception has occurred at the very
       beginning of a function before the stack frame has been created,
       or at the very end of the function after the stack frame has been
       destroyed.  This is an inherent limitation of frame pointers.

b) 100% reliable stack traces for DWARF enabled kernels

   This is not yet implemented.  For more details about what is planned,
   see tools/objtool/Documentation/stack-validation.txt.

c) Higher live patching compatibility rate

   This is not yet implemented.  For more details about what is planned,
   see tools/objtool/Documentation/stack-validation.txt.

To achieve the validation, "objtool check" enforces the following rules:

1. Each callable function must be annotated as such with the ELF
   function type.  In asm code, this is typically done using the
   ENTRY/ENDPROC macros.  If objtool finds a return instruction
   outside of a function, it flags an error since that usually indicates
   callable code which should be annotated accordingly.

   This rule is needed so that objtool can properly identify each
   callable function in order to analyze its stack metadata.

2. Conversely, each section of code which is *not* callable should *not*
   be annotated as an ELF function.  The ENDPROC macro shouldn't be used
   in this case.

   This rule is needed so that objtool can ignore non-callable code.
   Such code doesn't have to follow any of the other rules.

3. Each callable function which calls another function must have the
   correct frame pointer logic, if required by CONFIG_FRAME_POINTER or
   the architecture's back chain rules.  This can by done in asm code
   with the FRAME_BEGIN/FRAME_END macros.

   This rule ensures that frame pointer based stack traces will work as
   designed.  If function A doesn't create a stack frame before calling
   function B, the _caller_ of function A will be skipped on the stack
   trace.

4. Dynamic jumps and jumps to undefined symbols are only allowed if:

   a) the jump is part of a switch statement; or

   b) the jump matches sibling call semantics and the frame pointer has
      the same value it had on function entry.

   This rule is needed so that objtool can reliably analyze all of a
   function's code paths.  If a function jumps to code in another file,
   and it's not a sibling call, objtool has no way to follow the jump
   because it only analyzes a single file at a time.

5. A callable function may not execute kernel entry/exit instructions.
   The only code which needs such instructions is kernel entry code,
   which shouldn't be be in callable functions anyway.

   This rule is just a sanity check to ensure that callable functions
   return normally.

It currently only supports x86_64.  I tried to make the code generic so
that support for other architectures can hopefully be plugged in
relatively easily.

On my Lenovo laptop with a i7-4810MQ 4-core/8-thread CPU, building the
kernel with objtool checking every .o file adds about three seconds of
total build time.  It hasn't been optimized for performance yet, so
there are probably some opportunities for better build performance.
Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chris J Arges <chris.j.arges@canonical.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Pedro Alves <palves@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: live-patching@vger.kernel.org
Link: http://lkml.kernel.org/r/f3efb173de43bd067b060de73f856567c0fa1174.1456719558.git.jpoimboe@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 87aaff2a
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Showing with 5178 additions and 6 deletions
MAINTAINERS
View file @ 442f04c3
......@@ -7778,6 +7778,11 @@ L: alsa-devel@alsa-project.org (moderated for non-subscribers)
S: Maintained
F: sound/soc/codecs/tfa9879*
OBJTOOL
M: Josh Poimboeuf <jpoimboe@redhat.com>
S: Supported
F: tools/objtool/
OMAP SUPPORT
M: Tony Lindgren <tony@atomide.com>
L: linux-omap@vger.kernel.org
......
tools/Makefile
View file @ 442f04c3
......@@ -20,6 +20,7 @@ help:
@echo ' perf - Linux performance measurement and analysis tool'
@echo ' selftests - various kernel selftests'
@echo ' spi - spi tools'
@echo ' objtool - an ELF object analysis tool'
@echo ' tmon - thermal monitoring and tuning tool'
@echo ' turbostat - Intel CPU idle stats and freq reporting tool'
@echo ' usb - USB testing tools'
......@@ -53,7 +54,7 @@ acpi: FORCE
cpupower: FORCE
$(call descend,power/$@)
cgroup firewire hv guest spi usb virtio vm net iio: FORCE
cgroup firewire hv guest spi usb virtio vm net iio objtool: FORCE
$(call descend,$@)
liblockdep: FORCE
......@@ -85,7 +86,7 @@ freefall: FORCE
all: acpi cgroup cpupower hv firewire lguest \
perf selftests turbostat usb \
virtio vm net x86_energy_perf_policy \
tmon freefall
tmon freefall objtool
acpi_install:
$(call descend,power/$(@:_install=),install)
......@@ -93,7 +94,7 @@ acpi_install:
cpupower_install:
$(call descend,power/$(@:_install=),install)
cgroup_install firewire_install hv_install lguest_install perf_install usb_install virtio_install vm_install net_install:
cgroup_install firewire_install hv_install lguest_install perf_install usb_install virtio_install vm_install net_install objtool_install:
$(call descend,$(@:_install=),install)
selftests_install:
......@@ -111,7 +112,7 @@ freefall_install:
install: acpi_install cgroup_install cpupower_install hv_install firewire_install lguest_install \
perf_install selftests_install turbostat_install usb_install \
virtio_install vm_install net_install x86_energy_perf_policy_install \
tmon_install freefall_install
tmon_install freefall_install objtool_install
acpi_clean:
$(call descend,power/acpi,clean)
......@@ -119,7 +120,7 @@ acpi_clean:
cpupower_clean:
$(call descend,power/cpupower,clean)
cgroup_clean hv_clean firewire_clean lguest_clean spi_clean usb_clean virtio_clean vm_clean net_clean iio_clean:
cgroup_clean hv_clean firewire_clean lguest_clean spi_clean usb_clean virtio_clean vm_clean net_clean iio_clean objtool_clean:
$(call descend,$(@:_clean=),clean)
liblockdep_clean:
......@@ -155,6 +156,7 @@ build_clean:
clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean lguest_clean \
perf_clean selftests_clean turbostat_clean spi_clean usb_clean virtio_clean \
vm_clean net_clean iio_clean x86_energy_perf_policy_clean tmon_clean \
freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean
freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean \
objtool_clean
.PHONY: FORCE
tools/objtool/.gitignore 0 → 100644
View file @ 442f04c3
arch/x86/insn/inat-tables.c
objtool
tools/objtool/Build 0 → 100644
View file @ 442f04c3
objtool-y += arch/$(ARCH)/
objtool-y += builtin-check.o
objtool-y += elf.o
objtool-y += special.o
objtool-y += objtool.o
objtool-y += libstring.o
CFLAGS += -I$(srctree)/tools/lib
$(OUTPUT)libstring.o: ../lib/string.c FORCE
$(call rule_mkdir)
$(call if_changed_dep,cc_o_c)
tools/objtool/Documentation/stack-validation.txt 0 → 100644
View file @ 442f04c3
Compile-time stack metadata validation
======================================
Overview
--------
The kernel CONFIG_STACK_VALIDATION option enables a host tool named
objtool which runs at compile time. It has a "check" subcommand which
analyzes every .o file and ensures the validity of its stack metadata.
It enforces a set of rules on asm code and C inline assembly code so
that stack traces can be reliable.
Currently it only checks frame pointer usage, but there are plans to add
CFI validation for C files and CFI generation for asm files.
For each function, it recursively follows all possible code paths and
validates the correct frame pointer state at each instruction.
It also follows code paths involving special sections, like
.altinstructions, __jump_table, and __ex_table, which can add
alternative execution paths to a given instruction (or set of
instructions). Similarly, it knows how to follow switch statements, for
which gcc sometimes uses jump tables.
Why do we need stack metadata validation?
-----------------------------------------
Here are some of the benefits of validating stack metadata:
a) More reliable stack traces for frame pointer enabled kernels
Frame pointers are used for debugging purposes. They allow runtime
code and debug tools to be able to walk the stack to determine the
chain of function call sites that led to the currently executing
code.
For some architectures, frame pointers are enabled by
CONFIG_FRAME_POINTER. For some other architectures they may be
required by the ABI (sometimes referred to as "backchain pointers").
For C code, gcc automatically generates instructions for setting up
frame pointers when the -fno-omit-frame-pointer option is used.
But for asm code, the frame setup instructions have to be written by
hand, which most people don't do. So the end result is that
CONFIG_FRAME_POINTER is honored for C code but not for most asm code.
For stack traces based on frame pointers to be reliable, all
functions which call other functions must first create a stack frame
and update the frame pointer. If a first function doesn't properly
create a stack frame before calling a second function, the *caller*
of the first function will be skipped on the stack trace.
For example, consider the following example backtrace with frame
pointers enabled:
[<ffffffff81812584>] dump_stack+0x4b/0x63
[<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
[<ffffffff8127f568>] seq_read+0x108/0x3e0
[<ffffffff812cce62>] proc_reg_read+0x42/0x70
[<ffffffff81256197>] __vfs_read+0x37/0x100
[<ffffffff81256b16>] vfs_read+0x86/0x130
[<ffffffff81257898>] SyS_read+0x58/0xd0
[<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76
It correctly shows that the caller of cmdline_proc_show() is
seq_read().
If we remove the frame pointer logic from cmdline_proc_show() by
replacing the frame pointer related instructions with nops, here's
what it looks like instead:
[<ffffffff81812584>] dump_stack+0x4b/0x63
[<ffffffff812d6dc2>] cmdline_proc_show+0x12/0x30
[<ffffffff812cce62>] proc_reg_read+0x42/0x70
[<ffffffff81256197>] __vfs_read+0x37/0x100
[<ffffffff81256b16>] vfs_read+0x86/0x130
[<ffffffff81257898>] SyS_read+0x58/0xd0
[<ffffffff8181c1f2>] entry_SYSCALL_64_fastpath+0x12/0x76
Notice that cmdline_proc_show()'s caller, seq_read(), has been
skipped. Instead the stack trace seems to show that
cmdline_proc_show() was called by proc_reg_read().
The benefit of objtool here is that because it ensures that *all*
functions honor CONFIG_FRAME_POINTER, no functions will ever[*] be
skipped on a stack trace.
[*] unless an interrupt or exception has occurred at the very
beginning of a function before the stack frame has been created,
or at the very end of the function after the stack frame has been
destroyed. This is an inherent limitation of frame pointers.
b) 100% reliable stack traces for DWARF enabled kernels
(NOTE: This is not yet implemented)
As an alternative to frame pointers, DWARF Call Frame Information
(CFI) metadata can be used to walk the stack. Unlike frame pointers,
CFI metadata is out of band. So it doesn't affect runtime
performance and it can be reliable even when interrupts or exceptions
are involved.
For C code, gcc automatically generates DWARF CFI metadata. But for
asm code, generating CFI is a tedious manual approach which requires
manually placed .cfi assembler macros to be scattered throughout the
code. It's clumsy and very easy to get wrong, and it makes the real
code harder to read.
Stacktool will improve this situation in several ways. For code
which already has CFI annotations, it will validate them. For code
which doesn't have CFI annotations, it will generate them. So an
architecture can opt to strip out all the manual .cfi annotations
from their asm code and have objtool generate them instead.
We might also add a runtime stack validation debug option where we
periodically walk the stack from schedule() and/or an NMI to ensure
that the stack metadata is sane and that we reach the bottom of the
stack.
So the benefit of objtool here will be that external tooling should
always show perfect stack traces. And the same will be true for
kernel warning/oops traces if the architecture has a runtime DWARF
unwinder.
c) Higher live patching compatibility rate
(NOTE: This is not yet implemented)
Currently with CONFIG_LIVEPATCH there's a basic live patching
framework which is safe for roughly 85-90% of "security" fixes. But
patches can't have complex features like function dependency or
prototype changes, or data structure changes.
There's a strong need to support patches which have the more complex
features so that the patch compatibility rate for security fixes can
eventually approach something resembling 100%. To achieve that, a
"consistency model" is needed, which allows tasks to be safely
transitioned from an unpatched state to a patched state.
One of the key requirements of the currently proposed livepatch
consistency model [*] is that it needs to walk the stack of each
sleeping task to determine if it can be transitioned to the patched
state. If objtool can ensure that stack traces are reliable, this
consistency model can be used and the live patching compatibility
rate can be improved significantly.
[*] https://lkml.kernel.org/r/cover.1423499826.git.jpoimboe@redhat.com
Rules
-----
To achieve the validation, objtool enforces the following rules:
1. Each callable function must be annotated as such with the ELF
function type. In asm code, this is typically done using the
ENTRY/ENDPROC macros. If objtool finds a return instruction
outside of a function, it flags an error since that usually indicates
callable code which should be annotated accordingly.
This rule is needed so that objtool can properly identify each
callable function in order to analyze its stack metadata.
2. Conversely, each section of code which is *not* callable should *not*
be annotated as an ELF function. The ENDPROC macro shouldn't be used
in this case.
This rule is needed so that objtool can ignore non-callable code.
Such code doesn't have to follow any of the other rules.
3. Each callable function which calls another function must have the
correct frame pointer logic, if required by CONFIG_FRAME_POINTER or
the architecture's back chain rules. This can by done in asm code
with the FRAME_BEGIN/FRAME_END macros.
This rule ensures that frame pointer based stack traces will work as
designed. If function A doesn't create a stack frame before calling
function B, the _caller_ of function A will be skipped on the stack
trace.
4. Dynamic jumps and jumps to undefined symbols are only allowed if:
a) the jump is part of a switch statement; or
b) the jump matches sibling call semantics and the frame pointer has
the same value it had on function entry.
This rule is needed so that objtool can reliably analyze all of a
function's code paths. If a function jumps to code in another file,
and it's not a sibling call, objtool has no way to follow the jump
because it only analyzes a single file at a time.
5. A callable function may not execute kernel entry/exit instructions.
The only code which needs such instructions is kernel entry code,
which shouldn't be be in callable functions anyway.
This rule is just a sanity check to ensure that callable functions
return normally.
Errors in .S files
------------------
If you're getting an error in a compiled .S file which you don't
understand, first make sure that the affected code follows the above
rules.
Here are some examples of common warnings reported by objtool, what
they mean, and suggestions for how to fix them.
1. asm_file.o: warning: objtool: func()+0x128: call without frame pointer save/setup
The func() function made a function call without first saving and/or
updating the frame pointer.
If func() is indeed a callable function, add proper frame pointer
logic using the FRAME_BEGIN and FRAME_END macros. Otherwise, remove
its ELF function annotation by changing ENDPROC to END.
If you're getting this error in a .c file, see the "Errors in .c
files" section.
2. asm_file.o: warning: objtool: .text+0x53: return instruction outside of a callable function
A return instruction was detected, but objtool couldn't find a way
for a callable function to reach the instruction.
If the return instruction is inside (or reachable from) a callable
function, the function needs to be annotated with the ENTRY/ENDPROC
macros.
If you _really_ need a return instruction outside of a function, and
are 100% sure that it won't affect stack traces, you can tell
objtool to ignore it. See the "Adding exceptions" section below.
3. asm_file.o: warning: objtool: func()+0x9: function has unreachable instruction
The instruction lives inside of a callable function, but there's no
possible control flow path from the beginning of the function to the
instruction.
If the instruction is actually needed, and it's actually in a
callable function, ensure that its function is properly annotated
with ENTRY/ENDPROC.
If it's not actually in a callable function (e.g. kernel entry code),
change ENDPROC to END.
4. asm_file.o: warning: objtool: func(): can't find starting instruction
or
asm_file.o: warning: objtool: func()+0x11dd: can't decode instruction
Did you put data in a text section? If so, that can confuse
objtool's instruction decoder. Move the data to a more appropriate
section like .data or .rodata.
5. asm_file.o: warning: objtool: func()+0x6: kernel entry/exit from callable instruction
This is a kernel entry/exit instruction like sysenter or sysret.
Such instructions aren't allowed in a callable function, and are most
likely part of the kernel entry code.
If the instruction isn't actually in a callable function, change
ENDPROC to END.
6. asm_file.o: warning: objtool: func()+0x26: sibling call from callable instruction with changed frame pointer
This is a dynamic jump or a jump to an undefined symbol. Stacktool
assumed it's a sibling call and detected that the frame pointer
wasn't first restored to its original state.
If it's not really a sibling call, you may need to move the
destination code to the local file.
If the instruction is not actually in a callable function (e.g.
kernel entry code), change ENDPROC to END.
7. asm_file: warning: objtool: func()+0x5c: frame pointer state mismatch
The instruction's frame pointer state is inconsistent, depending on
which execution path was taken to reach the instruction.
Make sure the function pushes and sets up the frame pointer (for
x86_64, this means rbp) at the beginning of the function and pops it
at the end of the function. Also make sure that no other code in the
function touches the frame pointer.
Errors in .c files
------------------
If you're getting an objtool error in a compiled .c file, chances are
the file uses an asm() statement which has a "call" instruction. An
asm() statement with a call instruction must declare the use of the
stack pointer in its output operand. For example, on x86_64:
register void *__sp asm("rsp");
asm volatile("call func" : "+r" (__sp));
Otherwise the stack frame may not get created before the call.
Another possible cause for errors in C code is if the Makefile removes
-fno-omit-frame-pointer or adds -fomit-frame-pointer to the gcc options.
Also see the above section for .S file errors for more information what
the individual error messages mean.
If the error doesn't seem to make sense, it could be a bug in objtool.
Feel free to ask the objtool maintainer for help.
Adding exceptions
-----------------
If you _really_ need objtool to ignore something, and are 100% sure
that it won't affect kernel stack traces, you can tell objtool to
ignore it:
- To skip validation of a function, use the STACK_FRAME_NON_STANDARD
macro.
- To skip validation of a file, add
OBJECT_FILES_NON_STANDARD_filename.o := n
to the Makefile.
- To skip validation of a directory, add
OBJECT_FILES_NON_STANDARD := y
to the Makefile.
tools/objtool/Makefile 0 → 100644
View file @ 442f04c3
include ../scripts/Makefile.include
ifndef ($(ARCH))
ARCH ?= $(shell uname -m)
ifeq ($(ARCH),x86_64)
ARCH := x86
endif
endif
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(shell pwd)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
endif
SUBCMD_SRCDIR = $(srctree)/tools/lib/subcmd/
LIBSUBCMD = $(if $(OUTPUT),$(OUTPUT),$(SUBCMD_SRCDIR))libsubcmd.a
OBJTOOL := $(OUTPUT)objtool
OBJTOOL_IN := $(OBJTOOL)-in.o
all: $(OBJTOOL)
INCLUDES := -I$(srctree)/tools/include
CFLAGS += -Wall -Werror $(EXTRA_WARNINGS) -fomit-frame-pointer -O2 $(INCLUDES)
LDFLAGS += -lelf $(LIBSUBCMD)
AWK = awk
export srctree OUTPUT CFLAGS ARCH AWK
include $(srctree)/tools/build/Makefile.include
$(OBJTOOL_IN): fixdep FORCE
@$(MAKE) $(build)=objtool
$(OBJTOOL): $(LIBSUBCMD) $(OBJTOOL_IN)
@(test -d ../../kernel -a -d ../../tools -a -d ../objtool && (( \
diff -I'^#include' arch/x86/insn/insn.c ../../arch/x86/lib/insn.c >/dev/null && \
diff -I'^#include' arch/x86/insn/inat.c ../../arch/x86/lib/inat.c >/dev/null && \
diff arch/x86/insn/x86-opcode-map.txt ../../arch/x86/lib/x86-opcode-map.txt >/dev/null && \
diff arch/x86/insn/gen-insn-attr-x86.awk ../../arch/x86/tools/gen-insn-attr-x86.awk >/dev/null && \
diff -I'^#include' arch/x86/insn/insn.h ../../arch/x86/include/asm/insn.h >/dev/null && \
diff -I'^#include' arch/x86/insn/inat.h ../../arch/x86/include/asm/inat.h >/dev/null && \
diff -I'^#include' arch/x86/insn/inat_types.h ../../arch/x86/include/asm/inat_types.h >/dev/null) \
|| echo "Warning: objtool: x86 instruction decoder differs from kernel" >&2 )) || true
$(QUIET_LINK)$(CC) $(OBJTOOL_IN) $(LDFLAGS) -o $@
$(LIBSUBCMD): fixdep FORCE
$(Q)$(MAKE) -C $(SUBCMD_SRCDIR)
$(LIBSUBCMD)-clean:
$(Q)$(MAKE) -C $(SUBCMD_SRCDIR) clean > /dev/null
clean: $(LIBSUBCMD)-clean
$(call QUIET_CLEAN, objtool) $(RM) $(OBJTOOL)
$(Q)find $(OUTPUT) -name '*.o' -delete -o -name '\.*.cmd' -delete -o -name '\.*.d' -delete
$(Q)$(RM) $(OUTPUT)arch/x86/insn/inat-tables.c $(OUTPUT)fixdep
FORCE:
.PHONY: clean FORCE
tools/objtool/arch.h 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ARCH_H
#define _ARCH_H
#include <stdbool.h>
#include "elf.h"
#define INSN_FP_SAVE 1
#define INSN_FP_SETUP 2
#define INSN_FP_RESTORE 3
#define INSN_JUMP_CONDITIONAL 4
#define INSN_JUMP_UNCONDITIONAL 5
#define INSN_JUMP_DYNAMIC 6
#define INSN_CALL 7
#define INSN_CALL_DYNAMIC 8
#define INSN_RETURN 9
#define INSN_CONTEXT_SWITCH 10
#define INSN_BUG 11
#define INSN_NOP 12
#define INSN_OTHER 13
#define INSN_LAST INSN_OTHER
int arch_decode_instruction(struct elf *elf, struct section *sec,
unsigned long offset, unsigned int maxlen,
unsigned int *len, unsigned char *type,
unsigned long *displacement);
#endif /* _ARCH_H */
tools/objtool/arch/x86/Build 0 → 100644
View file @ 442f04c3
objtool-y += decode.o
inat_tables_script = arch/x86/insn/gen-insn-attr-x86.awk
inat_tables_maps = arch/x86/insn/x86-opcode-map.txt
$(OUTPUT)arch/x86/insn/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
$(call rule_mkdir)
$(Q)$(call echo-cmd,gen)$(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@
$(OUTPUT)arch/x86/decode.o: $(OUTPUT)arch/x86/insn/inat-tables.c
CFLAGS_decode.o += -I$(OUTPUT)arch/x86/insn
tools/objtool/arch/x86/decode.c 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#define unlikely(cond) (cond)
#include "insn/insn.h"
#include "insn/inat.c"
#include "insn/insn.c"
#include "../../elf.h"
#include "../../arch.h"
#include "../../warn.h"
static int is_x86_64(struct elf *elf)
{
switch (elf->ehdr.e_machine) {
case EM_X86_64:
return 1;
case EM_386:
return 0;
default:
WARN("unexpected ELF machine type %d", elf->ehdr.e_machine);
return -1;
}
}
int arch_decode_instruction(struct elf *elf, struct section *sec,
unsigned long offset, unsigned int maxlen,
unsigned int *len, unsigned char *type,
unsigned long *immediate)
{
struct insn insn;
int x86_64;
unsigned char op1, op2, ext;
x86_64 = is_x86_64(elf);
if (x86_64 == -1)
return -1;
insn_init(&insn, (void *)(sec->data + offset), maxlen, x86_64);
insn_get_length(&insn);
insn_get_opcode(&insn);
insn_get_modrm(&insn);
insn_get_immediate(&insn);
if (!insn_complete(&insn)) {
WARN_FUNC("can't decode instruction", sec, offset);
return -1;
}
*len = insn.length;
*type = INSN_OTHER;
if (insn.vex_prefix.nbytes)
return 0;
op1 = insn.opcode.bytes[0];
op2 = insn.opcode.bytes[1];
switch (op1) {
case 0x55:
if (!insn.rex_prefix.nbytes)
/* push rbp */
*type = INSN_FP_SAVE;
break;
case 0x5d:
if (!insn.rex_prefix.nbytes)
/* pop rbp */
*type = INSN_FP_RESTORE;
break;
case 0x70 ... 0x7f:
*type = INSN_JUMP_CONDITIONAL;
break;
case 0x89:
if (insn.rex_prefix.nbytes == 1 &&
insn.rex_prefix.bytes[0] == 0x48 &&
insn.modrm.nbytes && insn.modrm.bytes[0] == 0xe5)
/* mov rsp, rbp */
*type = INSN_FP_SETUP;
break;
case 0x90:
*type = INSN_NOP;
break;
case 0x0f:
if (op2 >= 0x80 && op2 <= 0x8f)
*type = INSN_JUMP_CONDITIONAL;
else if (op2 == 0x05 || op2 == 0x07 || op2 == 0x34 ||
op2 == 0x35)
/* sysenter, sysret */
*type = INSN_CONTEXT_SWITCH;
else if (op2 == 0x0b || op2 == 0xb9)
/* ud2 */
*type = INSN_BUG;
else if (op2 == 0x0d || op2 == 0x1f)
/* nopl/nopw */
*type = INSN_NOP;
else if (op2 == 0x01 && insn.modrm.nbytes &&
(insn.modrm.bytes[0] == 0xc2 ||
insn.modrm.bytes[0] == 0xd8))
/* vmlaunch, vmrun */
*type = INSN_CONTEXT_SWITCH;
break;
case 0xc9: /* leave */
*type = INSN_FP_RESTORE;
break;
case 0xe3: /* jecxz/jrcxz */
*type = INSN_JUMP_CONDITIONAL;
break;
case 0xe9:
case 0xeb:
*type = INSN_JUMP_UNCONDITIONAL;
break;
case 0xc2:
case 0xc3:
*type = INSN_RETURN;
break;
case 0xc5: /* iret */
case 0xca: /* retf */
case 0xcb: /* retf */
*type = INSN_CONTEXT_SWITCH;
break;
case 0xe8:
*type = INSN_CALL;
break;
case 0xff:
ext = X86_MODRM_REG(insn.modrm.bytes[0]);
if (ext == 2 || ext == 3)
*type = INSN_CALL_DYNAMIC;
else if (ext == 4)
*type = INSN_JUMP_DYNAMIC;
else if (ext == 5) /*jmpf */
*type = INSN_CONTEXT_SWITCH;
break;
default:
break;
}
*immediate = insn.immediate.nbytes ? insn.immediate.value : 0;
return 0;
}
tools/objtool/arch/x86/insn/gen-insn-attr-x86.awk 0 → 100644
View file @ 442f04c3
#!/bin/awk -f
# gen-insn-attr-x86.awk: Instruction attribute table generator
# Written by Masami Hiramatsu <mhiramat@redhat.com>
#
# Usage: awk -f gen-insn-attr-x86.awk x86-opcode-map.txt > inat-tables.c
# Awk implementation sanity check
function check_awk_implement() {
if (sprintf("%x", 0) != "0")
return "Your awk has a printf-format problem."
return ""
}
# Clear working vars
function clear_vars() {
delete table
delete lptable2
delete lptable1
delete lptable3
eid = -1 # escape id
gid = -1 # group id
aid = -1 # AVX id
tname = ""
}
BEGIN {
# Implementation error checking
awkchecked = check_awk_implement()
if (awkchecked != "") {
print "Error: " awkchecked > "/dev/stderr"
print "Please try to use gawk." > "/dev/stderr"
exit 1
}
# Setup generating tables
print "/* x86 opcode map generated from x86-opcode-map.txt */"
print "/* Do not change this code. */\n"
ggid = 1
geid = 1
gaid = 0
delete etable
delete gtable
delete atable
opnd_expr = "^[A-Za-z/]"
ext_expr = "^\\("
sep_expr = "^\\|$"
group_expr = "^Grp[0-9A-Za-z]+"
imm_expr = "^[IJAOL][a-z]"
imm_flag["Ib"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
imm_flag["Jb"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
imm_flag["Iw"] = "INAT_MAKE_IMM(INAT_IMM_WORD)"
imm_flag["Id"] = "INAT_MAKE_IMM(INAT_IMM_DWORD)"
imm_flag["Iq"] = "INAT_MAKE_IMM(INAT_IMM_QWORD)"
imm_flag["Ap"] = "INAT_MAKE_IMM(INAT_IMM_PTR)"
imm_flag["Iz"] = "INAT_MAKE_IMM(INAT_IMM_VWORD32)"
imm_flag["Jz"] = "INAT_MAKE_IMM(INAT_IMM_VWORD32)"
imm_flag["Iv"] = "INAT_MAKE_IMM(INAT_IMM_VWORD)"
imm_flag["Ob"] = "INAT_MOFFSET"
imm_flag["Ov"] = "INAT_MOFFSET"
imm_flag["Lx"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
modrm_expr = "^([CDEGMNPQRSUVW/][a-z]+|NTA|T[012])"
force64_expr = "\\([df]64\\)"
rex_expr = "^REX(\\.[XRWB]+)*"
fpu_expr = "^ESC" # TODO
lprefix1_expr = "\\((66|!F3)\\)"
lprefix2_expr = "\\(F3\\)"
lprefix3_expr = "\\((F2|!F3|66\\&F2)\\)"
lprefix_expr = "\\((66|F2|F3)\\)"
max_lprefix = 4
# All opcodes starting with lower-case 'v' or with (v1) superscript
# accepts VEX prefix
vexok_opcode_expr = "^v.*"
vexok_expr = "\\(v1\\)"
# All opcodes with (v) superscript supports *only* VEX prefix
vexonly_expr = "\\(v\\)"
prefix_expr = "\\(Prefix\\)"
prefix_num["Operand-Size"] = "INAT_PFX_OPNDSZ"
prefix_num["REPNE"] = "INAT_PFX_REPNE"
prefix_num["REP/REPE"] = "INAT_PFX_REPE"
prefix_num["XACQUIRE"] = "INAT_PFX_REPNE"
prefix_num["XRELEASE"] = "INAT_PFX_REPE"
prefix_num["LOCK"] = "INAT_PFX_LOCK"
prefix_num["SEG=CS"] = "INAT_PFX_CS"
prefix_num["SEG=DS"] = "INAT_PFX_DS"
prefix_num["SEG=ES"] = "INAT_PFX_ES"
prefix_num["SEG=FS"] = "INAT_PFX_FS"
prefix_num["SEG=GS"] = "INAT_PFX_GS"
prefix_num["SEG=SS"] = "INAT_PFX_SS"
prefix_num["Address-Size"] = "INAT_PFX_ADDRSZ"
prefix_num["VEX+1byte"] = "INAT_PFX_VEX2"
prefix_num["VEX+2byte"] = "INAT_PFX_VEX3"
clear_vars()
}
function semantic_error(msg) {
print "Semantic error at " NR ": " msg > "/dev/stderr"
exit 1
}
function debug(msg) {
print "DEBUG: " msg
}
function array_size(arr, i,c) {
c = 0
for (i in arr)
c++
return c
}
/^Table:/ {
print "/* " $0 " */"
if (tname != "")
semantic_error("Hit Table: before EndTable:.");
}
/^Referrer:/ {
if (NF != 1) {
# escape opcode table
ref = ""
for (i = 2; i <= NF; i++)
ref = ref $i
eid = escape[ref]
tname = sprintf("inat_escape_table_%d", eid)
}
}
/^AVXcode:/ {
if (NF != 1) {
# AVX/escape opcode table
aid = $2
if (gaid <= aid)
gaid = aid + 1
if (tname == "") # AVX only opcode table
tname = sprintf("inat_avx_table_%d", $2)
}
if (aid == -1 && eid == -1) # primary opcode table
tname = "inat_primary_table"
}
/^GrpTable:/ {
print "/* " $0 " */"
if (!($2 in group))
semantic_error("No group: " $2 )
gid = group[$2]
tname = "inat_group_table_" gid
}
function print_table(tbl,name,fmt,n)
{
print "const insn_attr_t " name " = {"
for (i = 0; i < n; i++) {
id = sprintf(fmt, i)
if (tbl[id])
print " [" id "] = " tbl[id] ","
}
print "};"
}
/^EndTable/ {
if (gid != -1) {
# print group tables
if (array_size(table) != 0) {
print_table(table, tname "[INAT_GROUP_TABLE_SIZE]",
"0x%x", 8)
gtable[gid,0] = tname
}
if (array_size(lptable1) != 0) {
print_table(lptable1, tname "_1[INAT_GROUP_TABLE_SIZE]",
"0x%x", 8)
gtable[gid,1] = tname "_1"
}
if (array_size(lptable2) != 0) {
print_table(lptable2, tname "_2[INAT_GROUP_TABLE_SIZE]",
"0x%x", 8)
gtable[gid,2] = tname "_2"
}
if (array_size(lptable3) != 0) {
print_table(lptable3, tname "_3[INAT_GROUP_TABLE_SIZE]",
"0x%x", 8)
gtable[gid,3] = tname "_3"
}
} else {
# print primary/escaped tables
if (array_size(table) != 0) {
print_table(table, tname "[INAT_OPCODE_TABLE_SIZE]",
"0x%02x", 256)
etable[eid,0] = tname
if (aid >= 0)
atable[aid,0] = tname
}
if (array_size(lptable1) != 0) {
print_table(lptable1,tname "_1[INAT_OPCODE_TABLE_SIZE]",
"0x%02x", 256)
etable[eid,1] = tname "_1"
if (aid >= 0)
atable[aid,1] = tname "_1"
}
if (array_size(lptable2) != 0) {
print_table(lptable2,tname "_2[INAT_OPCODE_TABLE_SIZE]",
"0x%02x", 256)
etable[eid,2] = tname "_2"
if (aid >= 0)
atable[aid,2] = tname "_2"
}
if (array_size(lptable3) != 0) {
print_table(lptable3,tname "_3[INAT_OPCODE_TABLE_SIZE]",
"0x%02x", 256)
etable[eid,3] = tname "_3"
if (aid >= 0)
atable[aid,3] = tname "_3"
}
}
print ""
clear_vars()
}
function add_flags(old,new) {
if (old && new)
return old " | " new
else if (old)
return old
else
return new
}
# convert operands to flags.
function convert_operands(count,opnd, i,j,imm,mod)
{
imm = null
mod = null
for (j = 1; j <= count; j++) {
i = opnd[j]
if (match(i, imm_expr) == 1) {
if (!imm_flag[i])
semantic_error("Unknown imm opnd: " i)
if (imm) {
if (i != "Ib")
semantic_error("Second IMM error")
imm = add_flags(imm, "INAT_SCNDIMM")
} else
imm = imm_flag[i]
} else if (match(i, modrm_expr))
mod = "INAT_MODRM"
}
return add_flags(imm, mod)
}
/^[0-9a-f]+\:/ {
if (NR == 1)
next
# get index
idx = "0x" substr($1, 1, index($1,":") - 1)
if (idx in table)
semantic_error("Redefine " idx " in " tname)
# check if escaped opcode
if ("escape" == $2) {
if ($3 != "#")
semantic_error("No escaped name")
ref = ""
for (i = 4; i <= NF; i++)
ref = ref $i
if (ref in escape)
semantic_error("Redefine escape (" ref ")")
escape[ref] = geid
geid++
table[idx] = "INAT_MAKE_ESCAPE(" escape[ref] ")"
next
}
variant = null
# converts
i = 2
while (i <= NF) {
opcode = $(i++)
delete opnds
ext = null
flags = null
opnd = null
# parse one opcode
if (match($i, opnd_expr)) {
opnd = $i
count = split($(i++), opnds, ",")
flags = convert_operands(count, opnds)
}
if (match($i, ext_expr))
ext = $(i++)
if (match($i, sep_expr))
i++
else if (i < NF)
semantic_error($i " is not a separator")
# check if group opcode
if (match(opcode, group_expr)) {
if (!(opcode in group)) {
group[opcode] = ggid
ggid++
}
flags = add_flags(flags, "INAT_MAKE_GROUP(" group[opcode] ")")
}
# check force(or default) 64bit
if (match(ext, force64_expr))
flags = add_flags(flags, "INAT_FORCE64")
# check REX prefix
if (match(opcode, rex_expr))
flags = add_flags(flags, "INAT_MAKE_PREFIX(INAT_PFX_REX)")
# check coprocessor escape : TODO
if (match(opcode, fpu_expr))
flags = add_flags(flags, "INAT_MODRM")
# check VEX codes
if (match(ext, vexonly_expr))
flags = add_flags(flags, "INAT_VEXOK | INAT_VEXONLY")
else if (match(ext, vexok_expr) || match(opcode, vexok_opcode_expr))
flags = add_flags(flags, "INAT_VEXOK")
# check prefixes
if (match(ext, prefix_expr)) {
if (!prefix_num[opcode])
semantic_error("Unknown prefix: " opcode)
flags = add_flags(flags, "INAT_MAKE_PREFIX(" prefix_num[opcode] ")")
}
if (length(flags) == 0)
continue
# check if last prefix
if (match(ext, lprefix1_expr)) {
lptable1[idx] = add_flags(lptable1[idx],flags)
variant = "INAT_VARIANT"
}
if (match(ext, lprefix2_expr)) {
lptable2[idx] = add_flags(lptable2[idx],flags)
variant = "INAT_VARIANT"
}
if (match(ext, lprefix3_expr)) {
lptable3[idx] = add_flags(lptable3[idx],flags)
variant = "INAT_VARIANT"
}
if (!match(ext, lprefix_expr)){
table[idx] = add_flags(table[idx],flags)
}
}
if (variant)
table[idx] = add_flags(table[idx],variant)
}
END {
if (awkchecked != "")
exit 1
# print escape opcode map's array
print "/* Escape opcode map array */"
print "const insn_attr_t * const inat_escape_tables[INAT_ESC_MAX + 1]" \
"[INAT_LSTPFX_MAX + 1] = {"
for (i = 0; i < geid; i++)
for (j = 0; j < max_lprefix; j++)
if (etable[i,j])
print " ["i"]["j"] = "etable[i,j]","
print "};\n"
# print group opcode map's array
print "/* Group opcode map array */"
print "const insn_attr_t * const inat_group_tables[INAT_GRP_MAX + 1]"\
"[INAT_LSTPFX_MAX + 1] = {"
for (i = 0; i < ggid; i++)
for (j = 0; j < max_lprefix; j++)
if (gtable[i,j])
print " ["i"]["j"] = "gtable[i,j]","
print "};\n"
# print AVX opcode map's array
print "/* AVX opcode map array */"
print "const insn_attr_t * const inat_avx_tables[X86_VEX_M_MAX + 1]"\
"[INAT_LSTPFX_MAX + 1] = {"
for (i = 0; i < gaid; i++)
for (j = 0; j < max_lprefix; j++)
if (atable[i,j])
print " ["i"]["j"] = "atable[i,j]","
print "};"
}
tools/objtool/arch/x86/insn/inat.c 0 → 100644
View file @ 442f04c3
/*
* x86 instruction attribute tables
*
* Written by Masami Hiramatsu <mhiramat@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "insn.h"
/* Attribute tables are generated from opcode map */
#include "inat-tables.c"
/* Attribute search APIs */
insn_attr_t inat_get_opcode_attribute(insn_byte_t opcode)
{
return inat_primary_table[opcode];
}
int inat_get_last_prefix_id(insn_byte_t last_pfx)
{
insn_attr_t lpfx_attr;
lpfx_attr = inat_get_opcode_attribute(last_pfx);
return inat_last_prefix_id(lpfx_attr);
}
insn_attr_t inat_get_escape_attribute(insn_byte_t opcode, int lpfx_id,
insn_attr_t esc_attr)
{
const insn_attr_t *table;
int n;
n = inat_escape_id(esc_attr);
table = inat_escape_tables[n][0];
if (!table)
return 0;
if (inat_has_variant(table[opcode]) && lpfx_id) {
table = inat_escape_tables[n][lpfx_id];
if (!table)
return 0;
}
return table[opcode];
}
insn_attr_t inat_get_group_attribute(insn_byte_t modrm, int lpfx_id,
insn_attr_t grp_attr)
{
const insn_attr_t *table;
int n;
n = inat_group_id(grp_attr);
table = inat_group_tables[n][0];
if (!table)
return inat_group_common_attribute(grp_attr);
if (inat_has_variant(table[X86_MODRM_REG(modrm)]) && lpfx_id) {
table = inat_group_tables[n][lpfx_id];
if (!table)
return inat_group_common_attribute(grp_attr);
}
return table[X86_MODRM_REG(modrm)] |
inat_group_common_attribute(grp_attr);
}
insn_attr_t inat_get_avx_attribute(insn_byte_t opcode, insn_byte_t vex_m,
insn_byte_t vex_p)
{
const insn_attr_t *table;
if (vex_m > X86_VEX_M_MAX || vex_p > INAT_LSTPFX_MAX)
return 0;
/* At first, this checks the master table */
table = inat_avx_tables[vex_m][0];
if (!table)
return 0;
if (!inat_is_group(table[opcode]) && vex_p) {
/* If this is not a group, get attribute directly */
table = inat_avx_tables[vex_m][vex_p];
if (!table)
return 0;
}
return table[opcode];
}
tools/objtool/arch/x86/insn/inat.h 0 → 100644
View file @ 442f04c3
#ifndef _ASM_X86_INAT_H
#define _ASM_X86_INAT_H
/*
* x86 instruction attributes
*
* Written by Masami Hiramatsu <mhiramat@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "inat_types.h"
/*
* Internal bits. Don't use bitmasks directly, because these bits are
* unstable. You should use checking functions.
*/
#define INAT_OPCODE_TABLE_SIZE 256
#define INAT_GROUP_TABLE_SIZE 8
/* Legacy last prefixes */
#define INAT_PFX_OPNDSZ 1 /* 0x66 */ /* LPFX1 */
#define INAT_PFX_REPE 2 /* 0xF3 */ /* LPFX2 */
#define INAT_PFX_REPNE 3 /* 0xF2 */ /* LPFX3 */
/* Other Legacy prefixes */
#define INAT_PFX_LOCK 4 /* 0xF0 */
#define INAT_PFX_CS 5 /* 0x2E */
#define INAT_PFX_DS 6 /* 0x3E */
#define INAT_PFX_ES 7 /* 0x26 */
#define INAT_PFX_FS 8 /* 0x64 */
#define INAT_PFX_GS 9 /* 0x65 */
#define INAT_PFX_SS 10 /* 0x36 */
#define INAT_PFX_ADDRSZ 11 /* 0x67 */
/* x86-64 REX prefix */
#define INAT_PFX_REX 12 /* 0x4X */
/* AVX VEX prefixes */
#define INAT_PFX_VEX2 13 /* 2-bytes VEX prefix */
#define INAT_PFX_VEX3 14 /* 3-bytes VEX prefix */
#define INAT_LSTPFX_MAX 3
#define INAT_LGCPFX_MAX 11
/* Immediate size */
#define INAT_IMM_BYTE 1
#define INAT_IMM_WORD 2
#define INAT_IMM_DWORD 3
#define INAT_IMM_QWORD 4
#define INAT_IMM_PTR 5
#define INAT_IMM_VWORD32 6
#define INAT_IMM_VWORD 7
/* Legacy prefix */
#define INAT_PFX_OFFS 0
#define INAT_PFX_BITS 4
#define INAT_PFX_MAX ((1 << INAT_PFX_BITS) - 1)
#define INAT_PFX_MASK (INAT_PFX_MAX << INAT_PFX_OFFS)
/* Escape opcodes */
#define INAT_ESC_OFFS (INAT_PFX_OFFS + INAT_PFX_BITS)
#define INAT_ESC_BITS 2
#define INAT_ESC_MAX ((1 << INAT_ESC_BITS) - 1)
#define INAT_ESC_MASK (INAT_ESC_MAX << INAT_ESC_OFFS)
/* Group opcodes (1-16) */
#define INAT_GRP_OFFS (INAT_ESC_OFFS + INAT_ESC_BITS)
#define INAT_GRP_BITS 5
#define INAT_GRP_MAX ((1 << INAT_GRP_BITS) - 1)
#define INAT_GRP_MASK (INAT_GRP_MAX << INAT_GRP_OFFS)
/* Immediates */
#define INAT_IMM_OFFS (INAT_GRP_OFFS + INAT_GRP_BITS)
#define INAT_IMM_BITS 3
#define INAT_IMM_MASK (((1 << INAT_IMM_BITS) - 1) << INAT_IMM_OFFS)
/* Flags */
#define INAT_FLAG_OFFS (INAT_IMM_OFFS + INAT_IMM_BITS)
#define INAT_MODRM (1 << (INAT_FLAG_OFFS))
#define INAT_FORCE64 (1 << (INAT_FLAG_OFFS + 1))
#define INAT_SCNDIMM (1 << (INAT_FLAG_OFFS + 2))
#define INAT_MOFFSET (1 << (INAT_FLAG_OFFS + 3))
#define INAT_VARIANT (1 << (INAT_FLAG_OFFS + 4))
#define INAT_VEXOK (1 << (INAT_FLAG_OFFS + 5))
#define INAT_VEXONLY (1 << (INAT_FLAG_OFFS + 6))
/* Attribute making macros for attribute tables */
#define INAT_MAKE_PREFIX(pfx) (pfx << INAT_PFX_OFFS)
#define INAT_MAKE_ESCAPE(esc) (esc << INAT_ESC_OFFS)
#define INAT_MAKE_GROUP(grp) ((grp << INAT_GRP_OFFS) | INAT_MODRM)
#define INAT_MAKE_IMM(imm) (imm << INAT_IMM_OFFS)
/* Attribute search APIs */
extern insn_attr_t inat_get_opcode_attribute(insn_byte_t opcode);
extern int inat_get_last_prefix_id(insn_byte_t last_pfx);
extern insn_attr_t inat_get_escape_attribute(insn_byte_t opcode,
int lpfx_id,
insn_attr_t esc_attr);
extern insn_attr_t inat_get_group_attribute(insn_byte_t modrm,
int lpfx_id,
insn_attr_t esc_attr);
extern insn_attr_t inat_get_avx_attribute(insn_byte_t opcode,
insn_byte_t vex_m,
insn_byte_t vex_pp);
/* Attribute checking functions */
static inline int inat_is_legacy_prefix(insn_attr_t attr)
{
attr &= INAT_PFX_MASK;
return attr && attr <= INAT_LGCPFX_MAX;
}
static inline int inat_is_address_size_prefix(insn_attr_t attr)
{
return (attr & INAT_PFX_MASK) == INAT_PFX_ADDRSZ;
}
static inline int inat_is_operand_size_prefix(insn_attr_t attr)
{
return (attr & INAT_PFX_MASK) == INAT_PFX_OPNDSZ;
}
static inline int inat_is_rex_prefix(insn_attr_t attr)
{
return (attr & INAT_PFX_MASK) == INAT_PFX_REX;
}
static inline int inat_last_prefix_id(insn_attr_t attr)
{
if ((attr & INAT_PFX_MASK) > INAT_LSTPFX_MAX)
return 0;
else
return attr & INAT_PFX_MASK;
}
static inline int inat_is_vex_prefix(insn_attr_t attr)
{
attr &= INAT_PFX_MASK;
return attr == INAT_PFX_VEX2 || attr == INAT_PFX_VEX3;
}
static inline int inat_is_vex3_prefix(insn_attr_t attr)
{
return (attr & INAT_PFX_MASK) == INAT_PFX_VEX3;
}
static inline int inat_is_escape(insn_attr_t attr)
{
return attr & INAT_ESC_MASK;
}
static inline int inat_escape_id(insn_attr_t attr)
{
return (attr & INAT_ESC_MASK) >> INAT_ESC_OFFS;
}
static inline int inat_is_group(insn_attr_t attr)
{
return attr & INAT_GRP_MASK;
}
static inline int inat_group_id(insn_attr_t attr)
{
return (attr & INAT_GRP_MASK) >> INAT_GRP_OFFS;
}
static inline int inat_group_common_attribute(insn_attr_t attr)
{
return attr & ~INAT_GRP_MASK;
}
static inline int inat_has_immediate(insn_attr_t attr)
{
return attr & INAT_IMM_MASK;
}
static inline int inat_immediate_size(insn_attr_t attr)
{
return (attr & INAT_IMM_MASK) >> INAT_IMM_OFFS;
}
static inline int inat_has_modrm(insn_attr_t attr)
{
return attr & INAT_MODRM;
}
static inline int inat_is_force64(insn_attr_t attr)
{
return attr & INAT_FORCE64;
}
static inline int inat_has_second_immediate(insn_attr_t attr)
{
return attr & INAT_SCNDIMM;
}
static inline int inat_has_moffset(insn_attr_t attr)
{
return attr & INAT_MOFFSET;
}
static inline int inat_has_variant(insn_attr_t attr)
{
return attr & INAT_VARIANT;
}
static inline int inat_accept_vex(insn_attr_t attr)
{
return attr & INAT_VEXOK;
}
static inline int inat_must_vex(insn_attr_t attr)
{
return attr & INAT_VEXONLY;
}
#endif
tools/objtool/arch/x86/insn/inat_types.h 0 → 100644
View file @ 442f04c3
#ifndef _ASM_X86_INAT_TYPES_H
#define _ASM_X86_INAT_TYPES_H
/*
* x86 instruction attributes
*
* Written by Masami Hiramatsu <mhiramat@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/* Instruction attributes */
typedef unsigned int insn_attr_t;
typedef unsigned char insn_byte_t;
typedef signed int insn_value_t;
#endif
tools/objtool/arch/x86/insn/insn.c 0 → 100644
View file @ 442f04c3
/*
* x86 instruction analysis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) IBM Corporation, 2002, 2004, 2009
*/
#ifdef __KERNEL__
#include <linux/string.h>
#else
#include <string.h>
#endif
#include "inat.h"
#include "insn.h"
/* Verify next sizeof(t) bytes can be on the same instruction */
#define validate_next(t, insn, n) \
((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
#define __get_next(t, insn) \
({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); r; })
#define __peek_nbyte_next(t, insn, n) \
({ t r = *(t*)((insn)->next_byte + n); r; })
#define get_next(t, insn) \
({ if (unlikely(!validate_next(t, insn, 0))) goto err_out; __get_next(t, insn); })
#define peek_nbyte_next(t, insn, n) \
({ if (unlikely(!validate_next(t, insn, n))) goto err_out; __peek_nbyte_next(t, insn, n); })
#define peek_next(t, insn) peek_nbyte_next(t, insn, 0)
/**
* insn_init() - initialize struct insn
* @insn: &struct insn to be initialized
* @kaddr: address (in kernel memory) of instruction (or copy thereof)
* @x86_64: !0 for 64-bit kernel or 64-bit app
*/
void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64)
{
/*
* Instructions longer than MAX_INSN_SIZE (15 bytes) are invalid
* even if the input buffer is long enough to hold them.
*/
if (buf_len > MAX_INSN_SIZE)
buf_len = MAX_INSN_SIZE;
memset(insn, 0, sizeof(*insn));
insn->kaddr = kaddr;
insn->end_kaddr = kaddr + buf_len;
insn->next_byte = kaddr;
insn->x86_64 = x86_64 ? 1 : 0;
insn->opnd_bytes = 4;
if (x86_64)
insn->addr_bytes = 8;
else
insn->addr_bytes = 4;
}
/**
* insn_get_prefixes - scan x86 instruction prefix bytes
* @insn: &struct insn containing instruction
*
* Populates the @insn->prefixes bitmap, and updates @insn->next_byte
* to point to the (first) opcode. No effect if @insn->prefixes.got
* is already set.
*/
void insn_get_prefixes(struct insn *insn)
{
struct insn_field *prefixes = &insn->prefixes;
insn_attr_t attr;
insn_byte_t b, lb;
int i, nb;
if (prefixes->got)
return;
nb = 0;
lb = 0;
b = peek_next(insn_byte_t, insn);
attr = inat_get_opcode_attribute(b);
while (inat_is_legacy_prefix(attr)) {
/* Skip if same prefix */
for (i = 0; i < nb; i++)
if (prefixes->bytes[i] == b)
goto found;
if (nb == 4)
/* Invalid instruction */
break;
prefixes->bytes[nb++] = b;
if (inat_is_address_size_prefix(attr)) {
/* address size switches 2/4 or 4/8 */
if (insn->x86_64)
insn->addr_bytes ^= 12;
else
insn->addr_bytes ^= 6;
} else if (inat_is_operand_size_prefix(attr)) {
/* oprand size switches 2/4 */
insn->opnd_bytes ^= 6;
}
found:
prefixes->nbytes++;
insn->next_byte++;
lb = b;
b = peek_next(insn_byte_t, insn);
attr = inat_get_opcode_attribute(b);
}
/* Set the last prefix */
if (lb && lb != insn->prefixes.bytes[3]) {
if (unlikely(insn->prefixes.bytes[3])) {
/* Swap the last prefix */
b = insn->prefixes.bytes[3];
for (i = 0; i < nb; i++)
if (prefixes->bytes[i] == lb)
prefixes->bytes[i] = b;
}
insn->prefixes.bytes[3] = lb;
}
/* Decode REX prefix */
if (insn->x86_64) {
b = peek_next(insn_byte_t, insn);
attr = inat_get_opcode_attribute(b);
if (inat_is_rex_prefix(attr)) {
insn->rex_prefix.value = b;
insn->rex_prefix.nbytes = 1;
insn->next_byte++;
if (X86_REX_W(b))
/* REX.W overrides opnd_size */
insn->opnd_bytes = 8;
}
}
insn->rex_prefix.got = 1;
/* Decode VEX prefix */
b = peek_next(insn_byte_t, insn);
attr = inat_get_opcode_attribute(b);
if (inat_is_vex_prefix(attr)) {
insn_byte_t b2 = peek_nbyte_next(insn_byte_t, insn, 1);
if (!insn->x86_64) {
/*
* In 32-bits mode, if the [7:6] bits (mod bits of
* ModRM) on the second byte are not 11b, it is
* LDS or LES.
*/
if (X86_MODRM_MOD(b2) != 3)
goto vex_end;
}
insn->vex_prefix.bytes[0] = b;
insn->vex_prefix.bytes[1] = b2;
if (inat_is_vex3_prefix(attr)) {
b2 = peek_nbyte_next(insn_byte_t, insn, 2);
insn->vex_prefix.bytes[2] = b2;
insn->vex_prefix.nbytes = 3;
insn->next_byte += 3;
if (insn->x86_64 && X86_VEX_W(b2))
/* VEX.W overrides opnd_size */
insn->opnd_bytes = 8;
} else {
/*
* For VEX2, fake VEX3-like byte#2.
* Makes it easier to decode vex.W, vex.vvvv,
* vex.L and vex.pp. Masking with 0x7f sets vex.W == 0.
*/
insn->vex_prefix.bytes[2] = b2 & 0x7f;
insn->vex_prefix.nbytes = 2;
insn->next_byte += 2;
}
}
vex_end:
insn->vex_prefix.got = 1;
prefixes->got = 1;
err_out:
return;
}
/**
* insn_get_opcode - collect opcode(s)
* @insn: &struct insn containing instruction
*
* Populates @insn->opcode, updates @insn->next_byte to point past the
* opcode byte(s), and set @insn->attr (except for groups).
* If necessary, first collects any preceding (prefix) bytes.
* Sets @insn->opcode.value = opcode1. No effect if @insn->opcode.got
* is already 1.
*/
void insn_get_opcode(struct insn *insn)
{
struct insn_field *opcode = &insn->opcode;
insn_byte_t op;
int pfx_id;
if (opcode->got)
return;
if (!insn->prefixes.got)
insn_get_prefixes(insn);
/* Get first opcode */
op = get_next(insn_byte_t, insn);
opcode->bytes[0] = op;
opcode->nbytes = 1;
/* Check if there is VEX prefix or not */
if (insn_is_avx(insn)) {
insn_byte_t m, p;
m = insn_vex_m_bits(insn);
p = insn_vex_p_bits(insn);
insn->attr = inat_get_avx_attribute(op, m, p);
if (!inat_accept_vex(insn->attr) && !inat_is_group(insn->attr))
insn->attr = 0; /* This instruction is bad */
goto end; /* VEX has only 1 byte for opcode */
}
insn->attr = inat_get_opcode_attribute(op);
while (inat_is_escape(insn->attr)) {
/* Get escaped opcode */
op = get_next(insn_byte_t, insn);
opcode->bytes[opcode->nbytes++] = op;
pfx_id = insn_last_prefix_id(insn);
insn->attr = inat_get_escape_attribute(op, pfx_id, insn->attr);
}
if (inat_must_vex(insn->attr))
insn->attr = 0; /* This instruction is bad */
end:
opcode->got = 1;
err_out:
return;
}
/**
* insn_get_modrm - collect ModRM byte, if any
* @insn: &struct insn containing instruction
*
* Populates @insn->modrm and updates @insn->next_byte to point past the
* ModRM byte, if any. If necessary, first collects the preceding bytes
* (prefixes and opcode(s)). No effect if @insn->modrm.got is already 1.
*/
void insn_get_modrm(struct insn *insn)
{
struct insn_field *modrm = &insn->modrm;
insn_byte_t pfx_id, mod;
if (modrm->got)
return;
if (!insn->opcode.got)
insn_get_opcode(insn);
if (inat_has_modrm(insn->attr)) {
mod = get_next(insn_byte_t, insn);
modrm->value = mod;
modrm->nbytes = 1;
if (inat_is_group(insn->attr)) {
pfx_id = insn_last_prefix_id(insn);
insn->attr = inat_get_group_attribute(mod, pfx_id,
insn->attr);
if (insn_is_avx(insn) && !inat_accept_vex(insn->attr))
insn->attr = 0; /* This is bad */
}
}
if (insn->x86_64 && inat_is_force64(insn->attr))
insn->opnd_bytes = 8;
modrm->got = 1;
err_out:
return;
}
/**
* insn_rip_relative() - Does instruction use RIP-relative addressing mode?
* @insn: &struct insn containing instruction
*
* If necessary, first collects the instruction up to and including the
* ModRM byte. No effect if @insn->x86_64 is 0.
*/
int insn_rip_relative(struct insn *insn)
{
struct insn_field *modrm = &insn->modrm;
if (!insn->x86_64)
return 0;
if (!modrm->got)
insn_get_modrm(insn);
/*
* For rip-relative instructions, the mod field (top 2 bits)
* is zero and the r/m field (bottom 3 bits) is 0x5.
*/
return (modrm->nbytes && (modrm->value & 0xc7) == 0x5);
}
/**
* insn_get_sib() - Get the SIB byte of instruction
* @insn: &struct insn containing instruction
*
* If necessary, first collects the instruction up to and including the
* ModRM byte.
*/
void insn_get_sib(struct insn *insn)
{
insn_byte_t modrm;
if (insn->sib.got)
return;
if (!insn->modrm.got)
insn_get_modrm(insn);
if (insn->modrm.nbytes) {
modrm = (insn_byte_t)insn->modrm.value;
if (insn->addr_bytes != 2 &&
X86_MODRM_MOD(modrm) != 3 && X86_MODRM_RM(modrm) == 4) {
insn->sib.value = get_next(insn_byte_t, insn);
insn->sib.nbytes = 1;
}
}
insn->sib.got = 1;
err_out:
return;
}
/**
* insn_get_displacement() - Get the displacement of instruction
* @insn: &struct insn containing instruction
*
* If necessary, first collects the instruction up to and including the
* SIB byte.
* Displacement value is sign-expanded.
*/
void insn_get_displacement(struct insn *insn)
{
insn_byte_t mod, rm, base;
if (insn->displacement.got)
return;
if (!insn->sib.got)
insn_get_sib(insn);
if (insn->modrm.nbytes) {
/*
* Interpreting the modrm byte:
* mod = 00 - no displacement fields (exceptions below)
* mod = 01 - 1-byte displacement field
* mod = 10 - displacement field is 4 bytes, or 2 bytes if
* address size = 2 (0x67 prefix in 32-bit mode)
* mod = 11 - no memory operand
*
* If address size = 2...
* mod = 00, r/m = 110 - displacement field is 2 bytes
*
* If address size != 2...
* mod != 11, r/m = 100 - SIB byte exists
* mod = 00, SIB base = 101 - displacement field is 4 bytes
* mod = 00, r/m = 101 - rip-relative addressing, displacement
* field is 4 bytes
*/
mod = X86_MODRM_MOD(insn->modrm.value);
rm = X86_MODRM_RM(insn->modrm.value);
base = X86_SIB_BASE(insn->sib.value);
if (mod == 3)
goto out;
if (mod == 1) {
insn->displacement.value = get_next(char, insn);
insn->displacement.nbytes = 1;
} else if (insn->addr_bytes == 2) {
if ((mod == 0 && rm == 6) || mod == 2) {
insn->displacement.value =
get_next(short, insn);
insn->displacement.nbytes = 2;
}
} else {
if ((mod == 0 && rm == 5) || mod == 2 ||
(mod == 0 && base == 5)) {
insn->displacement.value = get_next(int, insn);
insn->displacement.nbytes = 4;
}
}
}
out:
insn->displacement.got = 1;
err_out:
return;
}
/* Decode moffset16/32/64. Return 0 if failed */
static int __get_moffset(struct insn *insn)
{
switch (insn->addr_bytes) {
case 2:
insn->moffset1.value = get_next(short, insn);
insn->moffset1.nbytes = 2;
break;
case 4:
insn->moffset1.value = get_next(int, insn);
insn->moffset1.nbytes = 4;
break;
case 8:
insn->moffset1.value = get_next(int, insn);
insn->moffset1.nbytes = 4;
insn->moffset2.value = get_next(int, insn);
insn->moffset2.nbytes = 4;
break;
default: /* opnd_bytes must be modified manually */
goto err_out;
}
insn->moffset1.got = insn->moffset2.got = 1;
return 1;
err_out:
return 0;
}
/* Decode imm v32(Iz). Return 0 if failed */
static int __get_immv32(struct insn *insn)
{
switch (insn->opnd_bytes) {
case 2:
insn->immediate.value = get_next(short, insn);
insn->immediate.nbytes = 2;
break;
case 4:
case 8:
insn->immediate.value = get_next(int, insn);
insn->immediate.nbytes = 4;
break;
default: /* opnd_bytes must be modified manually */
goto err_out;
}
return 1;
err_out:
return 0;
}
/* Decode imm v64(Iv/Ov), Return 0 if failed */
static int __get_immv(struct insn *insn)
{
switch (insn->opnd_bytes) {
case 2:
insn->immediate1.value = get_next(short, insn);
insn->immediate1.nbytes = 2;
break;
case 4:
insn->immediate1.value = get_next(int, insn);
insn->immediate1.nbytes = 4;
break;
case 8:
insn->immediate1.value = get_next(int, insn);
insn->immediate1.nbytes = 4;
insn->immediate2.value = get_next(int, insn);
insn->immediate2.nbytes = 4;
break;
default: /* opnd_bytes must be modified manually */
goto err_out;
}
insn->immediate1.got = insn->immediate2.got = 1;
return 1;
err_out:
return 0;
}
/* Decode ptr16:16/32(Ap) */
static int __get_immptr(struct insn *insn)
{
switch (insn->opnd_bytes) {
case 2:
insn->immediate1.value = get_next(short, insn);
insn->immediate1.nbytes = 2;
break;
case 4:
insn->immediate1.value = get_next(int, insn);
insn->immediate1.nbytes = 4;
break;
case 8:
/* ptr16:64 is not exist (no segment) */
return 0;
default: /* opnd_bytes must be modified manually */
goto err_out;
}
insn->immediate2.value = get_next(unsigned short, insn);
insn->immediate2.nbytes = 2;
insn->immediate1.got = insn->immediate2.got = 1;
return 1;
err_out:
return 0;
}
/**
* insn_get_immediate() - Get the immediates of instruction
* @insn: &struct insn containing instruction
*
* If necessary, first collects the instruction up to and including the
* displacement bytes.
* Basically, most of immediates are sign-expanded. Unsigned-value can be
* get by bit masking with ((1 << (nbytes * 8)) - 1)
*/
void insn_get_immediate(struct insn *insn)
{
if (insn->immediate.got)
return;
if (!insn->displacement.got)
insn_get_displacement(insn);
if (inat_has_moffset(insn->attr)) {
if (!__get_moffset(insn))
goto err_out;
goto done;
}
if (!inat_has_immediate(insn->attr))
/* no immediates */
goto done;
switch (inat_immediate_size(insn->attr)) {
case INAT_IMM_BYTE:
insn->immediate.value = get_next(char, insn);
insn->immediate.nbytes = 1;
break;
case INAT_IMM_WORD:
insn->immediate.value = get_next(short, insn);
insn->immediate.nbytes = 2;
break;
case INAT_IMM_DWORD:
insn->immediate.value = get_next(int, insn);
insn->immediate.nbytes = 4;
break;
case INAT_IMM_QWORD:
insn->immediate1.value = get_next(int, insn);
insn->immediate1.nbytes = 4;
insn->immediate2.value = get_next(int, insn);
insn->immediate2.nbytes = 4;
break;
case INAT_IMM_PTR:
if (!__get_immptr(insn))
goto err_out;
break;
case INAT_IMM_VWORD32:
if (!__get_immv32(insn))
goto err_out;
break;
case INAT_IMM_VWORD:
if (!__get_immv(insn))
goto err_out;
break;
default:
/* Here, insn must have an immediate, but failed */
goto err_out;
}
if (inat_has_second_immediate(insn->attr)) {
insn->immediate2.value = get_next(char, insn);
insn->immediate2.nbytes = 1;
}
done:
insn->immediate.got = 1;
err_out:
return;
}
/**
* insn_get_length() - Get the length of instruction
* @insn: &struct insn containing instruction
*
* If necessary, first collects the instruction up to and including the
* immediates bytes.
*/
void insn_get_length(struct insn *insn)
{
if (insn->length)
return;
if (!insn->immediate.got)
insn_get_immediate(insn);
insn->length = (unsigned char)((unsigned long)insn->next_byte
- (unsigned long)insn->kaddr);
}
tools/objtool/arch/x86/insn/insn.h 0 → 100644
View file @ 442f04c3
#ifndef _ASM_X86_INSN_H
#define _ASM_X86_INSN_H
/*
* x86 instruction analysis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) IBM Corporation, 2009
*/
/* insn_attr_t is defined in inat.h */
#include "inat.h"
struct insn_field {
union {
insn_value_t value;
insn_byte_t bytes[4];
};
/* !0 if we've run insn_get_xxx() for this field */
unsigned char got;
unsigned char nbytes;
};
struct insn {
struct insn_field prefixes; /*
* Prefixes
* prefixes.bytes[3]: last prefix
*/
struct insn_field rex_prefix; /* REX prefix */
struct insn_field vex_prefix; /* VEX prefix */
struct insn_field opcode; /*
* opcode.bytes[0]: opcode1
* opcode.bytes[1]: opcode2
* opcode.bytes[2]: opcode3
*/
struct insn_field modrm;
struct insn_field sib;
struct insn_field displacement;
union {
struct insn_field immediate;
struct insn_field moffset1; /* for 64bit MOV */
struct insn_field immediate1; /* for 64bit imm or off16/32 */
};
union {
struct insn_field moffset2; /* for 64bit MOV */
struct insn_field immediate2; /* for 64bit imm or seg16 */
};
insn_attr_t attr;
unsigned char opnd_bytes;
unsigned char addr_bytes;
unsigned char length;
unsigned char x86_64;
const insn_byte_t *kaddr; /* kernel address of insn to analyze */
const insn_byte_t *end_kaddr; /* kernel address of last insn in buffer */
const insn_byte_t *next_byte;
};
#define MAX_INSN_SIZE 15
#define X86_MODRM_MOD(modrm) (((modrm) & 0xc0) >> 6)
#define X86_MODRM_REG(modrm) (((modrm) & 0x38) >> 3)
#define X86_MODRM_RM(modrm) ((modrm) & 0x07)
#define X86_SIB_SCALE(sib) (((sib) & 0xc0) >> 6)
#define X86_SIB_INDEX(sib) (((sib) & 0x38) >> 3)
#define X86_SIB_BASE(sib) ((sib) & 0x07)
#define X86_REX_W(rex) ((rex) & 8)
#define X86_REX_R(rex) ((rex) & 4)
#define X86_REX_X(rex) ((rex) & 2)
#define X86_REX_B(rex) ((rex) & 1)
/* VEX bit flags */
#define X86_VEX_W(vex) ((vex) & 0x80) /* VEX3 Byte2 */
#define X86_VEX_R(vex) ((vex) & 0x80) /* VEX2/3 Byte1 */
#define X86_VEX_X(vex) ((vex) & 0x40) /* VEX3 Byte1 */
#define X86_VEX_B(vex) ((vex) & 0x20) /* VEX3 Byte1 */
#define X86_VEX_L(vex) ((vex) & 0x04) /* VEX3 Byte2, VEX2 Byte1 */
/* VEX bit fields */
#define X86_VEX3_M(vex) ((vex) & 0x1f) /* VEX3 Byte1 */
#define X86_VEX2_M 1 /* VEX2.M always 1 */
#define X86_VEX_V(vex) (((vex) & 0x78) >> 3) /* VEX3 Byte2, VEX2 Byte1 */
#define X86_VEX_P(vex) ((vex) & 0x03) /* VEX3 Byte2, VEX2 Byte1 */
#define X86_VEX_M_MAX 0x1f /* VEX3.M Maximum value */
extern void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64);
extern void insn_get_prefixes(struct insn *insn);
extern void insn_get_opcode(struct insn *insn);
extern void insn_get_modrm(struct insn *insn);
extern void insn_get_sib(struct insn *insn);
extern void insn_get_displacement(struct insn *insn);
extern void insn_get_immediate(struct insn *insn);
extern void insn_get_length(struct insn *insn);
/* Attribute will be determined after getting ModRM (for opcode groups) */
static inline void insn_get_attribute(struct insn *insn)
{
insn_get_modrm(insn);
}
/* Instruction uses RIP-relative addressing */
extern int insn_rip_relative(struct insn *insn);
/* Init insn for kernel text */
static inline void kernel_insn_init(struct insn *insn,
const void *kaddr, int buf_len)
{
#ifdef CONFIG_X86_64
insn_init(insn, kaddr, buf_len, 1);
#else /* CONFIG_X86_32 */
insn_init(insn, kaddr, buf_len, 0);
#endif
}
static inline int insn_is_avx(struct insn *insn)
{
if (!insn->prefixes.got)
insn_get_prefixes(insn);
return (insn->vex_prefix.value != 0);
}
/* Ensure this instruction is decoded completely */
static inline int insn_complete(struct insn *insn)
{
return insn->opcode.got && insn->modrm.got && insn->sib.got &&
insn->displacement.got && insn->immediate.got;
}
static inline insn_byte_t insn_vex_m_bits(struct insn *insn)
{
if (insn->vex_prefix.nbytes == 2) /* 2 bytes VEX */
return X86_VEX2_M;
else
return X86_VEX3_M(insn->vex_prefix.bytes[1]);
}
static inline insn_byte_t insn_vex_p_bits(struct insn *insn)
{
if (insn->vex_prefix.nbytes == 2) /* 2 bytes VEX */
return X86_VEX_P(insn->vex_prefix.bytes[1]);
else
return X86_VEX_P(insn->vex_prefix.bytes[2]);
}
/* Get the last prefix id from last prefix or VEX prefix */
static inline int insn_last_prefix_id(struct insn *insn)
{
if (insn_is_avx(insn))
return insn_vex_p_bits(insn); /* VEX_p is a SIMD prefix id */
if (insn->prefixes.bytes[3])
return inat_get_last_prefix_id(insn->prefixes.bytes[3]);
return 0;
}
/* Offset of each field from kaddr */
static inline int insn_offset_rex_prefix(struct insn *insn)
{
return insn->prefixes.nbytes;
}
static inline int insn_offset_vex_prefix(struct insn *insn)
{
return insn_offset_rex_prefix(insn) + insn->rex_prefix.nbytes;
}
static inline int insn_offset_opcode(struct insn *insn)
{
return insn_offset_vex_prefix(insn) + insn->vex_prefix.nbytes;
}
static inline int insn_offset_modrm(struct insn *insn)
{
return insn_offset_opcode(insn) + insn->opcode.nbytes;
}
static inline int insn_offset_sib(struct insn *insn)
{
return insn_offset_modrm(insn) + insn->modrm.nbytes;
}
static inline int insn_offset_displacement(struct insn *insn)
{
return insn_offset_sib(insn) + insn->sib.nbytes;
}
static inline int insn_offset_immediate(struct insn *insn)
{
return insn_offset_displacement(insn) + insn->displacement.nbytes;
}
#endif /* _ASM_X86_INSN_H */
tools/objtool/arch/x86/insn/x86-opcode-map.txt 0 → 100644
View file @ 442f04c3
# x86 Opcode Maps
#
# This is (mostly) based on following documentations.
# - Intel(R) 64 and IA-32 Architectures Software Developer's Manual Vol.2C
# (#326018-047US, June 2013)
#
#<Opcode maps>
# Table: table-name
# Referrer: escaped-name
# AVXcode: avx-code
# opcode: mnemonic|GrpXXX [operand1[,operand2...]] [(extra1)[,(extra2)...] [| 2nd-mnemonic ...]
# (or)
# opcode: escape # escaped-name
# EndTable
#
#<group maps>
# GrpTable: GrpXXX
# reg: mnemonic [operand1[,operand2...]] [(extra1)[,(extra2)...] [| 2nd-mnemonic ...]
# EndTable
#
# AVX Superscripts
# (v): this opcode requires VEX prefix.
# (v1): this opcode only supports 128bit VEX.
#
# Last Prefix Superscripts
# - (66): the last prefix is 0x66
# - (F3): the last prefix is 0xF3
# - (F2): the last prefix is 0xF2
# - (!F3) : the last prefix is not 0xF3 (including non-last prefix case)
# - (66&F2): Both 0x66 and 0xF2 prefixes are specified.
Table: one byte opcode
Referrer:
AVXcode:
# 0x00 - 0x0f
00: ADD Eb,Gb
01: ADD Ev,Gv
02: ADD Gb,Eb
03: ADD Gv,Ev
04: ADD AL,Ib
05: ADD rAX,Iz
06: PUSH ES (i64)
07: POP ES (i64)
08: OR Eb,Gb
09: OR Ev,Gv
0a: OR Gb,Eb
0b: OR Gv,Ev
0c: OR AL,Ib
0d: OR rAX,Iz
0e: PUSH CS (i64)
0f: escape # 2-byte escape
# 0x10 - 0x1f
10: ADC Eb,Gb
11: ADC Ev,Gv
12: ADC Gb,Eb
13: ADC Gv,Ev
14: ADC AL,Ib
15: ADC rAX,Iz
16: PUSH SS (i64)
17: POP SS (i64)
18: SBB Eb,Gb
19: SBB Ev,Gv
1a: SBB Gb,Eb
1b: SBB Gv,Ev
1c: SBB AL,Ib
1d: SBB rAX,Iz
1e: PUSH DS (i64)
1f: POP DS (i64)
# 0x20 - 0x2f
20: AND Eb,Gb
21: AND Ev,Gv
22: AND Gb,Eb
23: AND Gv,Ev
24: AND AL,Ib
25: AND rAx,Iz
26: SEG=ES (Prefix)
27: DAA (i64)
28: SUB Eb,Gb
29: SUB Ev,Gv
2a: SUB Gb,Eb
2b: SUB Gv,Ev
2c: SUB AL,Ib
2d: SUB rAX,Iz
2e: SEG=CS (Prefix)
2f: DAS (i64)
# 0x30 - 0x3f
30: XOR Eb,Gb
31: XOR Ev,Gv
32: XOR Gb,Eb
33: XOR Gv,Ev
34: XOR AL,Ib
35: XOR rAX,Iz
36: SEG=SS (Prefix)
37: AAA (i64)
38: CMP Eb,Gb
39: CMP Ev,Gv
3a: CMP Gb,Eb
3b: CMP Gv,Ev
3c: CMP AL,Ib
3d: CMP rAX,Iz
3e: SEG=DS (Prefix)
3f: AAS (i64)
# 0x40 - 0x4f
40: INC eAX (i64) | REX (o64)
41: INC eCX (i64) | REX.B (o64)
42: INC eDX (i64) | REX.X (o64)
43: INC eBX (i64) | REX.XB (o64)
44: INC eSP (i64) | REX.R (o64)
45: INC eBP (i64) | REX.RB (o64)
46: INC eSI (i64) | REX.RX (o64)
47: INC eDI (i64) | REX.RXB (o64)
48: DEC eAX (i64) | REX.W (o64)
49: DEC eCX (i64) | REX.WB (o64)
4a: DEC eDX (i64) | REX.WX (o64)
4b: DEC eBX (i64) | REX.WXB (o64)
4c: DEC eSP (i64) | REX.WR (o64)
4d: DEC eBP (i64) | REX.WRB (o64)
4e: DEC eSI (i64) | REX.WRX (o64)
4f: DEC eDI (i64) | REX.WRXB (o64)
# 0x50 - 0x5f
50: PUSH rAX/r8 (d64)
51: PUSH rCX/r9 (d64)
52: PUSH rDX/r10 (d64)
53: PUSH rBX/r11 (d64)
54: PUSH rSP/r12 (d64)
55: PUSH rBP/r13 (d64)
56: PUSH rSI/r14 (d64)
57: PUSH rDI/r15 (d64)
58: POP rAX/r8 (d64)
59: POP rCX/r9 (d64)
5a: POP rDX/r10 (d64)
5b: POP rBX/r11 (d64)
5c: POP rSP/r12 (d64)
5d: POP rBP/r13 (d64)
5e: POP rSI/r14 (d64)
5f: POP rDI/r15 (d64)
# 0x60 - 0x6f
60: PUSHA/PUSHAD (i64)
61: POPA/POPAD (i64)
62: BOUND Gv,Ma (i64)
63: ARPL Ew,Gw (i64) | MOVSXD Gv,Ev (o64)
64: SEG=FS (Prefix)
65: SEG=GS (Prefix)
66: Operand-Size (Prefix)
67: Address-Size (Prefix)
68: PUSH Iz (d64)
69: IMUL Gv,Ev,Iz
6a: PUSH Ib (d64)
6b: IMUL Gv,Ev,Ib
6c: INS/INSB Yb,DX
6d: INS/INSW/INSD Yz,DX
6e: OUTS/OUTSB DX,Xb
6f: OUTS/OUTSW/OUTSD DX,Xz
# 0x70 - 0x7f
70: JO Jb
71: JNO Jb
72: JB/JNAE/JC Jb
73: JNB/JAE/JNC Jb
74: JZ/JE Jb
75: JNZ/JNE Jb
76: JBE/JNA Jb
77: JNBE/JA Jb
78: JS Jb
79: JNS Jb
7a: JP/JPE Jb
7b: JNP/JPO Jb
7c: JL/JNGE Jb
7d: JNL/JGE Jb
7e: JLE/JNG Jb
7f: JNLE/JG Jb
# 0x80 - 0x8f
80: Grp1 Eb,Ib (1A)
81: Grp1 Ev,Iz (1A)
82: Grp1 Eb,Ib (1A),(i64)
83: Grp1 Ev,Ib (1A)
84: TEST Eb,Gb
85: TEST Ev,Gv
86: XCHG Eb,Gb
87: XCHG Ev,Gv
88: MOV Eb,Gb
89: MOV Ev,Gv
8a: MOV Gb,Eb
8b: MOV Gv,Ev
8c: MOV Ev,Sw
8d: LEA Gv,M
8e: MOV Sw,Ew
8f: Grp1A (1A) | POP Ev (d64)
# 0x90 - 0x9f
90: NOP | PAUSE (F3) | XCHG r8,rAX
91: XCHG rCX/r9,rAX
92: XCHG rDX/r10,rAX
93: XCHG rBX/r11,rAX
94: XCHG rSP/r12,rAX
95: XCHG rBP/r13,rAX
96: XCHG rSI/r14,rAX
97: XCHG rDI/r15,rAX
98: CBW/CWDE/CDQE
99: CWD/CDQ/CQO
9a: CALLF Ap (i64)
9b: FWAIT/WAIT
9c: PUSHF/D/Q Fv (d64)
9d: POPF/D/Q Fv (d64)
9e: SAHF
9f: LAHF
# 0xa0 - 0xaf
a0: MOV AL,Ob
a1: MOV rAX,Ov
a2: MOV Ob,AL
a3: MOV Ov,rAX
a4: MOVS/B Yb,Xb
a5: MOVS/W/D/Q Yv,Xv
a6: CMPS/B Xb,Yb
a7: CMPS/W/D Xv,Yv
a8: TEST AL,Ib
a9: TEST rAX,Iz
aa: STOS/B Yb,AL
ab: STOS/W/D/Q Yv,rAX
ac: LODS/B AL,Xb
ad: LODS/W/D/Q rAX,Xv
ae: SCAS/B AL,Yb
# Note: The May 2011 Intel manual shows Xv for the second parameter of the
# next instruction but Yv is correct
af: SCAS/W/D/Q rAX,Yv
# 0xb0 - 0xbf
b0: MOV AL/R8L,Ib
b1: MOV CL/R9L,Ib
b2: MOV DL/R10L,Ib
b3: MOV BL/R11L,Ib
b4: MOV AH/R12L,Ib
b5: MOV CH/R13L,Ib
b6: MOV DH/R14L,Ib
b7: MOV BH/R15L,Ib
b8: MOV rAX/r8,Iv
b9: MOV rCX/r9,Iv
ba: MOV rDX/r10,Iv
bb: MOV rBX/r11,Iv
bc: MOV rSP/r12,Iv
bd: MOV rBP/r13,Iv
be: MOV rSI/r14,Iv
bf: MOV rDI/r15,Iv
# 0xc0 - 0xcf
c0: Grp2 Eb,Ib (1A)
c1: Grp2 Ev,Ib (1A)
c2: RETN Iw (f64)
c3: RETN
c4: LES Gz,Mp (i64) | VEX+2byte (Prefix)
c5: LDS Gz,Mp (i64) | VEX+1byte (Prefix)
c6: Grp11A Eb,Ib (1A)
c7: Grp11B Ev,Iz (1A)
c8: ENTER Iw,Ib
c9: LEAVE (d64)
ca: RETF Iw
cb: RETF
cc: INT3
cd: INT Ib
ce: INTO (i64)
cf: IRET/D/Q
# 0xd0 - 0xdf
d0: Grp2 Eb,1 (1A)
d1: Grp2 Ev,1 (1A)
d2: Grp2 Eb,CL (1A)
d3: Grp2 Ev,CL (1A)
d4: AAM Ib (i64)
d5: AAD Ib (i64)
d6:
d7: XLAT/XLATB
d8: ESC
d9: ESC
da: ESC
db: ESC
dc: ESC
dd: ESC
de: ESC
df: ESC
# 0xe0 - 0xef
# Note: "forced64" is Intel CPU behavior: they ignore 0x66 prefix
# in 64-bit mode. AMD CPUs accept 0x66 prefix, it causes RIP truncation
# to 16 bits. In 32-bit mode, 0x66 is accepted by both Intel and AMD.
e0: LOOPNE/LOOPNZ Jb (f64)
e1: LOOPE/LOOPZ Jb (f64)
e2: LOOP Jb (f64)
e3: JrCXZ Jb (f64)
e4: IN AL,Ib
e5: IN eAX,Ib
e6: OUT Ib,AL
e7: OUT Ib,eAX
# With 0x66 prefix in 64-bit mode, for AMD CPUs immediate offset
# in "near" jumps and calls is 16-bit. For CALL,
# push of return address is 16-bit wide, RSP is decremented by 2
# but is not truncated to 16 bits, unlike RIP.
e8: CALL Jz (f64)
e9: JMP-near Jz (f64)
ea: JMP-far Ap (i64)
eb: JMP-short Jb (f64)
ec: IN AL,DX
ed: IN eAX,DX
ee: OUT DX,AL
ef: OUT DX,eAX
# 0xf0 - 0xff
f0: LOCK (Prefix)
f1:
f2: REPNE (Prefix) | XACQUIRE (Prefix)
f3: REP/REPE (Prefix) | XRELEASE (Prefix)
f4: HLT
f5: CMC
f6: Grp3_1 Eb (1A)
f7: Grp3_2 Ev (1A)
f8: CLC
f9: STC
fa: CLI
fb: STI
fc: CLD
fd: STD
fe: Grp4 (1A)
ff: Grp5 (1A)
EndTable
Table: 2-byte opcode (0x0f)
Referrer: 2-byte escape
AVXcode: 1
# 0x0f 0x00-0x0f
00: Grp6 (1A)
01: Grp7 (1A)
02: LAR Gv,Ew
03: LSL Gv,Ew
04:
05: SYSCALL (o64)
06: CLTS
07: SYSRET (o64)
08: INVD
09: WBINVD
0a:
0b: UD2 (1B)
0c:
# AMD's prefetch group. Intel supports prefetchw(/1) only.
0d: GrpP
0e: FEMMS
# 3DNow! uses the last imm byte as opcode extension.
0f: 3DNow! Pq,Qq,Ib
# 0x0f 0x10-0x1f
# NOTE: According to Intel SDM opcode map, vmovups and vmovupd has no operands
# but it actually has operands. And also, vmovss and vmovsd only accept 128bit.
# MOVSS/MOVSD has too many forms(3) on SDM. This map just shows a typical form.
# Many AVX instructions lack v1 superscript, according to Intel AVX-Prgramming
# Reference A.1
10: vmovups Vps,Wps | vmovupd Vpd,Wpd (66) | vmovss Vx,Hx,Wss (F3),(v1) | vmovsd Vx,Hx,Wsd (F2),(v1)
11: vmovups Wps,Vps | vmovupd Wpd,Vpd (66) | vmovss Wss,Hx,Vss (F3),(v1) | vmovsd Wsd,Hx,Vsd (F2),(v1)
12: vmovlps Vq,Hq,Mq (v1) | vmovhlps Vq,Hq,Uq (v1) | vmovlpd Vq,Hq,Mq (66),(v1) | vmovsldup Vx,Wx (F3) | vmovddup Vx,Wx (F2)
13: vmovlps Mq,Vq (v1) | vmovlpd Mq,Vq (66),(v1)
14: vunpcklps Vx,Hx,Wx | vunpcklpd Vx,Hx,Wx (66)
15: vunpckhps Vx,Hx,Wx | vunpckhpd Vx,Hx,Wx (66)
16: vmovhps Vdq,Hq,Mq (v1) | vmovlhps Vdq,Hq,Uq (v1) | vmovhpd Vdq,Hq,Mq (66),(v1) | vmovshdup Vx,Wx (F3)
17: vmovhps Mq,Vq (v1) | vmovhpd Mq,Vq (66),(v1)
18: Grp16 (1A)
19:
# Intel SDM opcode map does not list MPX instructions. For now using Gv for
# bnd registers and Ev for everything else is OK because the instruction
# decoder does not use the information except as an indication that there is
# a ModR/M byte.
1a: BNDCL Gv,Ev (F3) | BNDCU Gv,Ev (F2) | BNDMOV Gv,Ev (66) | BNDLDX Gv,Ev
1b: BNDCN Gv,Ev (F2) | BNDMOV Ev,Gv (66) | BNDMK Gv,Ev (F3) | BNDSTX Ev,Gv
1c:
1d:
1e:
1f: NOP Ev
# 0x0f 0x20-0x2f
20: MOV Rd,Cd
21: MOV Rd,Dd
22: MOV Cd,Rd
23: MOV Dd,Rd
24:
25:
26:
27:
28: vmovaps Vps,Wps | vmovapd Vpd,Wpd (66)
29: vmovaps Wps,Vps | vmovapd Wpd,Vpd (66)
2a: cvtpi2ps Vps,Qpi | cvtpi2pd Vpd,Qpi (66) | vcvtsi2ss Vss,Hss,Ey (F3),(v1) | vcvtsi2sd Vsd,Hsd,Ey (F2),(v1)
2b: vmovntps Mps,Vps | vmovntpd Mpd,Vpd (66)
2c: cvttps2pi Ppi,Wps | cvttpd2pi Ppi,Wpd (66) | vcvttss2si Gy,Wss (F3),(v1) | vcvttsd2si Gy,Wsd (F2),(v1)
2d: cvtps2pi Ppi,Wps | cvtpd2pi Qpi,Wpd (66) | vcvtss2si Gy,Wss (F3),(v1) | vcvtsd2si Gy,Wsd (F2),(v1)
2e: vucomiss Vss,Wss (v1) | vucomisd Vsd,Wsd (66),(v1)
2f: vcomiss Vss,Wss (v1) | vcomisd Vsd,Wsd (66),(v1)
# 0x0f 0x30-0x3f
30: WRMSR
31: RDTSC
32: RDMSR
33: RDPMC
34: SYSENTER
35: SYSEXIT
36:
37: GETSEC
38: escape # 3-byte escape 1
39:
3a: escape # 3-byte escape 2
3b:
3c:
3d:
3e:
3f:
# 0x0f 0x40-0x4f
40: CMOVO Gv,Ev
41: CMOVNO Gv,Ev
42: CMOVB/C/NAE Gv,Ev
43: CMOVAE/NB/NC Gv,Ev
44: CMOVE/Z Gv,Ev
45: CMOVNE/NZ Gv,Ev
46: CMOVBE/NA Gv,Ev
47: CMOVA/NBE Gv,Ev
48: CMOVS Gv,Ev
49: CMOVNS Gv,Ev
4a: CMOVP/PE Gv,Ev
4b: CMOVNP/PO Gv,Ev
4c: CMOVL/NGE Gv,Ev
4d: CMOVNL/GE Gv,Ev
4e: CMOVLE/NG Gv,Ev
4f: CMOVNLE/G Gv,Ev
# 0x0f 0x50-0x5f
50: vmovmskps Gy,Ups | vmovmskpd Gy,Upd (66)
51: vsqrtps Vps,Wps | vsqrtpd Vpd,Wpd (66) | vsqrtss Vss,Hss,Wss (F3),(v1) | vsqrtsd Vsd,Hsd,Wsd (F2),(v1)
52: vrsqrtps Vps,Wps | vrsqrtss Vss,Hss,Wss (F3),(v1)
53: vrcpps Vps,Wps | vrcpss Vss,Hss,Wss (F3),(v1)
54: vandps Vps,Hps,Wps | vandpd Vpd,Hpd,Wpd (66)
55: vandnps Vps,Hps,Wps | vandnpd Vpd,Hpd,Wpd (66)
56: vorps Vps,Hps,Wps | vorpd Vpd,Hpd,Wpd (66)
57: vxorps Vps,Hps,Wps | vxorpd Vpd,Hpd,Wpd (66)
58: vaddps Vps,Hps,Wps | vaddpd Vpd,Hpd,Wpd (66) | vaddss Vss,Hss,Wss (F3),(v1) | vaddsd Vsd,Hsd,Wsd (F2),(v1)
59: vmulps Vps,Hps,Wps | vmulpd Vpd,Hpd,Wpd (66) | vmulss Vss,Hss,Wss (F3),(v1) | vmulsd Vsd,Hsd,Wsd (F2),(v1)
5a: vcvtps2pd Vpd,Wps | vcvtpd2ps Vps,Wpd (66) | vcvtss2sd Vsd,Hx,Wss (F3),(v1) | vcvtsd2ss Vss,Hx,Wsd (F2),(v1)
5b: vcvtdq2ps Vps,Wdq | vcvtps2dq Vdq,Wps (66) | vcvttps2dq Vdq,Wps (F3)
5c: vsubps Vps,Hps,Wps | vsubpd Vpd,Hpd,Wpd (66) | vsubss Vss,Hss,Wss (F3),(v1) | vsubsd Vsd,Hsd,Wsd (F2),(v1)
5d: vminps Vps,Hps,Wps | vminpd Vpd,Hpd,Wpd (66) | vminss Vss,Hss,Wss (F3),(v1) | vminsd Vsd,Hsd,Wsd (F2),(v1)
5e: vdivps Vps,Hps,Wps | vdivpd Vpd,Hpd,Wpd (66) | vdivss Vss,Hss,Wss (F3),(v1) | vdivsd Vsd,Hsd,Wsd (F2),(v1)
5f: vmaxps Vps,Hps,Wps | vmaxpd Vpd,Hpd,Wpd (66) | vmaxss Vss,Hss,Wss (F3),(v1) | vmaxsd Vsd,Hsd,Wsd (F2),(v1)
# 0x0f 0x60-0x6f
60: punpcklbw Pq,Qd | vpunpcklbw Vx,Hx,Wx (66),(v1)
61: punpcklwd Pq,Qd | vpunpcklwd Vx,Hx,Wx (66),(v1)
62: punpckldq Pq,Qd | vpunpckldq Vx,Hx,Wx (66),(v1)
63: packsswb Pq,Qq | vpacksswb Vx,Hx,Wx (66),(v1)
64: pcmpgtb Pq,Qq | vpcmpgtb Vx,Hx,Wx (66),(v1)
65: pcmpgtw Pq,Qq | vpcmpgtw Vx,Hx,Wx (66),(v1)
66: pcmpgtd Pq,Qq | vpcmpgtd Vx,Hx,Wx (66),(v1)
67: packuswb Pq,Qq | vpackuswb Vx,Hx,Wx (66),(v1)
68: punpckhbw Pq,Qd | vpunpckhbw Vx,Hx,Wx (66),(v1)
69: punpckhwd Pq,Qd | vpunpckhwd Vx,Hx,Wx (66),(v1)
6a: punpckhdq Pq,Qd | vpunpckhdq Vx,Hx,Wx (66),(v1)
6b: packssdw Pq,Qd | vpackssdw Vx,Hx,Wx (66),(v1)
6c: vpunpcklqdq Vx,Hx,Wx (66),(v1)
6d: vpunpckhqdq Vx,Hx,Wx (66),(v1)
6e: movd/q Pd,Ey | vmovd/q Vy,Ey (66),(v1)
6f: movq Pq,Qq | vmovdqa Vx,Wx (66) | vmovdqu Vx,Wx (F3)
# 0x0f 0x70-0x7f
70: pshufw Pq,Qq,Ib | vpshufd Vx,Wx,Ib (66),(v1) | vpshufhw Vx,Wx,Ib (F3),(v1) | vpshuflw Vx,Wx,Ib (F2),(v1)
71: Grp12 (1A)
72: Grp13 (1A)
73: Grp14 (1A)
74: pcmpeqb Pq,Qq | vpcmpeqb Vx,Hx,Wx (66),(v1)
75: pcmpeqw Pq,Qq | vpcmpeqw Vx,Hx,Wx (66),(v1)
76: pcmpeqd Pq,Qq | vpcmpeqd Vx,Hx,Wx (66),(v1)
# Note: Remove (v), because vzeroall and vzeroupper becomes emms without VEX.
77: emms | vzeroupper | vzeroall
78: VMREAD Ey,Gy
79: VMWRITE Gy,Ey
7a:
7b:
7c: vhaddpd Vpd,Hpd,Wpd (66) | vhaddps Vps,Hps,Wps (F2)
7d: vhsubpd Vpd,Hpd,Wpd (66) | vhsubps Vps,Hps,Wps (F2)
7e: movd/q Ey,Pd | vmovd/q Ey,Vy (66),(v1) | vmovq Vq,Wq (F3),(v1)
7f: movq Qq,Pq | vmovdqa Wx,Vx (66) | vmovdqu Wx,Vx (F3)
# 0x0f 0x80-0x8f
# Note: "forced64" is Intel CPU behavior (see comment about CALL insn).
80: JO Jz (f64)
81: JNO Jz (f64)
82: JB/JC/JNAE Jz (f64)
83: JAE/JNB/JNC Jz (f64)
84: JE/JZ Jz (f64)
85: JNE/JNZ Jz (f64)
86: JBE/JNA Jz (f64)
87: JA/JNBE Jz (f64)
88: JS Jz (f64)
89: JNS Jz (f64)
8a: JP/JPE Jz (f64)
8b: JNP/JPO Jz (f64)
8c: JL/JNGE Jz (f64)
8d: JNL/JGE Jz (f64)
8e: JLE/JNG Jz (f64)
8f: JNLE/JG Jz (f64)
# 0x0f 0x90-0x9f
90: SETO Eb
91: SETNO Eb
92: SETB/C/NAE Eb
93: SETAE/NB/NC Eb
94: SETE/Z Eb
95: SETNE/NZ Eb
96: SETBE/NA Eb
97: SETA/NBE Eb
98: SETS Eb
99: SETNS Eb
9a: SETP/PE Eb
9b: SETNP/PO Eb
9c: SETL/NGE Eb
9d: SETNL/GE Eb
9e: SETLE/NG Eb
9f: SETNLE/G Eb
# 0x0f 0xa0-0xaf
a0: PUSH FS (d64)
a1: POP FS (d64)
a2: CPUID
a3: BT Ev,Gv
a4: SHLD Ev,Gv,Ib
a5: SHLD Ev,Gv,CL
a6: GrpPDLK
a7: GrpRNG
a8: PUSH GS (d64)
a9: POP GS (d64)
aa: RSM
ab: BTS Ev,Gv
ac: SHRD Ev,Gv,Ib
ad: SHRD Ev,Gv,CL
ae: Grp15 (1A),(1C)
af: IMUL Gv,Ev
# 0x0f 0xb0-0xbf
b0: CMPXCHG Eb,Gb
b1: CMPXCHG Ev,Gv
b2: LSS Gv,Mp
b3: BTR Ev,Gv
b4: LFS Gv,Mp
b5: LGS Gv,Mp
b6: MOVZX Gv,Eb
b7: MOVZX Gv,Ew
b8: JMPE (!F3) | POPCNT Gv,Ev (F3)
b9: Grp10 (1A)
ba: Grp8 Ev,Ib (1A)
bb: BTC Ev,Gv
bc: BSF Gv,Ev (!F3) | TZCNT Gv,Ev (F3)
bd: BSR Gv,Ev (!F3) | LZCNT Gv,Ev (F3)
be: MOVSX Gv,Eb
bf: MOVSX Gv,Ew
# 0x0f 0xc0-0xcf
c0: XADD Eb,Gb
c1: XADD Ev,Gv
c2: vcmpps Vps,Hps,Wps,Ib | vcmppd Vpd,Hpd,Wpd,Ib (66) | vcmpss Vss,Hss,Wss,Ib (F3),(v1) | vcmpsd Vsd,Hsd,Wsd,Ib (F2),(v1)
c3: movnti My,Gy
c4: pinsrw Pq,Ry/Mw,Ib | vpinsrw Vdq,Hdq,Ry/Mw,Ib (66),(v1)
c5: pextrw Gd,Nq,Ib | vpextrw Gd,Udq,Ib (66),(v1)
c6: vshufps Vps,Hps,Wps,Ib | vshufpd Vpd,Hpd,Wpd,Ib (66)
c7: Grp9 (1A)
c8: BSWAP RAX/EAX/R8/R8D
c9: BSWAP RCX/ECX/R9/R9D
ca: BSWAP RDX/EDX/R10/R10D
cb: BSWAP RBX/EBX/R11/R11D
cc: BSWAP RSP/ESP/R12/R12D
cd: BSWAP RBP/EBP/R13/R13D
ce: BSWAP RSI/ESI/R14/R14D
cf: BSWAP RDI/EDI/R15/R15D
# 0x0f 0xd0-0xdf
d0: vaddsubpd Vpd,Hpd,Wpd (66) | vaddsubps Vps,Hps,Wps (F2)
d1: psrlw Pq,Qq | vpsrlw Vx,Hx,Wx (66),(v1)
d2: psrld Pq,Qq | vpsrld Vx,Hx,Wx (66),(v1)
d3: psrlq Pq,Qq | vpsrlq Vx,Hx,Wx (66),(v1)
d4: paddq Pq,Qq | vpaddq Vx,Hx,Wx (66),(v1)
d5: pmullw Pq,Qq | vpmullw Vx,Hx,Wx (66),(v1)
d6: vmovq Wq,Vq (66),(v1) | movq2dq Vdq,Nq (F3) | movdq2q Pq,Uq (F2)
d7: pmovmskb Gd,Nq | vpmovmskb Gd,Ux (66),(v1)
d8: psubusb Pq,Qq | vpsubusb Vx,Hx,Wx (66),(v1)
d9: psubusw Pq,Qq | vpsubusw Vx,Hx,Wx (66),(v1)
da: pminub Pq,Qq | vpminub Vx,Hx,Wx (66),(v1)
db: pand Pq,Qq | vpand Vx,Hx,Wx (66),(v1)
dc: paddusb Pq,Qq | vpaddusb Vx,Hx,Wx (66),(v1)
dd: paddusw Pq,Qq | vpaddusw Vx,Hx,Wx (66),(v1)
de: pmaxub Pq,Qq | vpmaxub Vx,Hx,Wx (66),(v1)
df: pandn Pq,Qq | vpandn Vx,Hx,Wx (66),(v1)
# 0x0f 0xe0-0xef
e0: pavgb Pq,Qq | vpavgb Vx,Hx,Wx (66),(v1)
e1: psraw Pq,Qq | vpsraw Vx,Hx,Wx (66),(v1)
e2: psrad Pq,Qq | vpsrad Vx,Hx,Wx (66),(v1)
e3: pavgw Pq,Qq | vpavgw Vx,Hx,Wx (66),(v1)
e4: pmulhuw Pq,Qq | vpmulhuw Vx,Hx,Wx (66),(v1)
e5: pmulhw Pq,Qq | vpmulhw Vx,Hx,Wx (66),(v1)
e6: vcvttpd2dq Vx,Wpd (66) | vcvtdq2pd Vx,Wdq (F3) | vcvtpd2dq Vx,Wpd (F2)
e7: movntq Mq,Pq | vmovntdq Mx,Vx (66)
e8: psubsb Pq,Qq | vpsubsb Vx,Hx,Wx (66),(v1)
e9: psubsw Pq,Qq | vpsubsw Vx,Hx,Wx (66),(v1)
ea: pminsw Pq,Qq | vpminsw Vx,Hx,Wx (66),(v1)
eb: por Pq,Qq | vpor Vx,Hx,Wx (66),(v1)
ec: paddsb Pq,Qq | vpaddsb Vx,Hx,Wx (66),(v1)
ed: paddsw Pq,Qq | vpaddsw Vx,Hx,Wx (66),(v1)
ee: pmaxsw Pq,Qq | vpmaxsw Vx,Hx,Wx (66),(v1)
ef: pxor Pq,Qq | vpxor Vx,Hx,Wx (66),(v1)
# 0x0f 0xf0-0xff
f0: vlddqu Vx,Mx (F2)
f1: psllw Pq,Qq | vpsllw Vx,Hx,Wx (66),(v1)
f2: pslld Pq,Qq | vpslld Vx,Hx,Wx (66),(v1)
f3: psllq Pq,Qq | vpsllq Vx,Hx,Wx (66),(v1)
f4: pmuludq Pq,Qq | vpmuludq Vx,Hx,Wx (66),(v1)
f5: pmaddwd Pq,Qq | vpmaddwd Vx,Hx,Wx (66),(v1)
f6: psadbw Pq,Qq | vpsadbw Vx,Hx,Wx (66),(v1)
f7: maskmovq Pq,Nq | vmaskmovdqu Vx,Ux (66),(v1)
f8: psubb Pq,Qq | vpsubb Vx,Hx,Wx (66),(v1)
f9: psubw Pq,Qq | vpsubw Vx,Hx,Wx (66),(v1)
fa: psubd Pq,Qq | vpsubd Vx,Hx,Wx (66),(v1)
fb: psubq Pq,Qq | vpsubq Vx,Hx,Wx (66),(v1)
fc: paddb Pq,Qq | vpaddb Vx,Hx,Wx (66),(v1)
fd: paddw Pq,Qq | vpaddw Vx,Hx,Wx (66),(v1)
fe: paddd Pq,Qq | vpaddd Vx,Hx,Wx (66),(v1)
ff:
EndTable
Table: 3-byte opcode 1 (0x0f 0x38)
Referrer: 3-byte escape 1
AVXcode: 2
# 0x0f 0x38 0x00-0x0f
00: pshufb Pq,Qq | vpshufb Vx,Hx,Wx (66),(v1)
01: phaddw Pq,Qq | vphaddw Vx,Hx,Wx (66),(v1)
02: phaddd Pq,Qq | vphaddd Vx,Hx,Wx (66),(v1)
03: phaddsw Pq,Qq | vphaddsw Vx,Hx,Wx (66),(v1)
04: pmaddubsw Pq,Qq | vpmaddubsw Vx,Hx,Wx (66),(v1)
05: phsubw Pq,Qq | vphsubw Vx,Hx,Wx (66),(v1)
06: phsubd Pq,Qq | vphsubd Vx,Hx,Wx (66),(v1)
07: phsubsw Pq,Qq | vphsubsw Vx,Hx,Wx (66),(v1)
08: psignb Pq,Qq | vpsignb Vx,Hx,Wx (66),(v1)
09: psignw Pq,Qq | vpsignw Vx,Hx,Wx (66),(v1)
0a: psignd Pq,Qq | vpsignd Vx,Hx,Wx (66),(v1)
0b: pmulhrsw Pq,Qq | vpmulhrsw Vx,Hx,Wx (66),(v1)
0c: vpermilps Vx,Hx,Wx (66),(v)
0d: vpermilpd Vx,Hx,Wx (66),(v)
0e: vtestps Vx,Wx (66),(v)
0f: vtestpd Vx,Wx (66),(v)
# 0x0f 0x38 0x10-0x1f
10: pblendvb Vdq,Wdq (66)
11:
12:
13: vcvtph2ps Vx,Wx,Ib (66),(v)
14: blendvps Vdq,Wdq (66)
15: blendvpd Vdq,Wdq (66)
16: vpermps Vqq,Hqq,Wqq (66),(v)
17: vptest Vx,Wx (66)
18: vbroadcastss Vx,Wd (66),(v)
19: vbroadcastsd Vqq,Wq (66),(v)
1a: vbroadcastf128 Vqq,Mdq (66),(v)
1b:
1c: pabsb Pq,Qq | vpabsb Vx,Wx (66),(v1)
1d: pabsw Pq,Qq | vpabsw Vx,Wx (66),(v1)
1e: pabsd Pq,Qq | vpabsd Vx,Wx (66),(v1)
1f:
# 0x0f 0x38 0x20-0x2f
20: vpmovsxbw Vx,Ux/Mq (66),(v1)
21: vpmovsxbd Vx,Ux/Md (66),(v1)
22: vpmovsxbq Vx,Ux/Mw (66),(v1)
23: vpmovsxwd Vx,Ux/Mq (66),(v1)
24: vpmovsxwq Vx,Ux/Md (66),(v1)
25: vpmovsxdq Vx,Ux/Mq (66),(v1)
26:
27:
28: vpmuldq Vx,Hx,Wx (66),(v1)
29: vpcmpeqq Vx,Hx,Wx (66),(v1)
2a: vmovntdqa Vx,Mx (66),(v1)
2b: vpackusdw Vx,Hx,Wx (66),(v1)
2c: vmaskmovps Vx,Hx,Mx (66),(v)
2d: vmaskmovpd Vx,Hx,Mx (66),(v)
2e: vmaskmovps Mx,Hx,Vx (66),(v)
2f: vmaskmovpd Mx,Hx,Vx (66),(v)
# 0x0f 0x38 0x30-0x3f
30: vpmovzxbw Vx,Ux/Mq (66),(v1)
31: vpmovzxbd Vx,Ux/Md (66),(v1)
32: vpmovzxbq Vx,Ux/Mw (66),(v1)
33: vpmovzxwd Vx,Ux/Mq (66),(v1)
34: vpmovzxwq Vx,Ux/Md (66),(v1)
35: vpmovzxdq Vx,Ux/Mq (66),(v1)
36: vpermd Vqq,Hqq,Wqq (66),(v)
37: vpcmpgtq Vx,Hx,Wx (66),(v1)
38: vpminsb Vx,Hx,Wx (66),(v1)
39: vpminsd Vx,Hx,Wx (66),(v1)
3a: vpminuw Vx,Hx,Wx (66),(v1)
3b: vpminud Vx,Hx,Wx (66),(v1)
3c: vpmaxsb Vx,Hx,Wx (66),(v1)
3d: vpmaxsd Vx,Hx,Wx (66),(v1)
3e: vpmaxuw Vx,Hx,Wx (66),(v1)
3f: vpmaxud Vx,Hx,Wx (66),(v1)
# 0x0f 0x38 0x40-0x8f
40: vpmulld Vx,Hx,Wx (66),(v1)
41: vphminposuw Vdq,Wdq (66),(v1)
42:
43:
44:
45: vpsrlvd/q Vx,Hx,Wx (66),(v)
46: vpsravd Vx,Hx,Wx (66),(v)
47: vpsllvd/q Vx,Hx,Wx (66),(v)
# Skip 0x48-0x57
58: vpbroadcastd Vx,Wx (66),(v)
59: vpbroadcastq Vx,Wx (66),(v)
5a: vbroadcasti128 Vqq,Mdq (66),(v)
# Skip 0x5b-0x77
78: vpbroadcastb Vx,Wx (66),(v)
79: vpbroadcastw Vx,Wx (66),(v)
# Skip 0x7a-0x7f
80: INVEPT Gy,Mdq (66)
81: INVPID Gy,Mdq (66)
82: INVPCID Gy,Mdq (66)
8c: vpmaskmovd/q Vx,Hx,Mx (66),(v)
8e: vpmaskmovd/q Mx,Vx,Hx (66),(v)
# 0x0f 0x38 0x90-0xbf (FMA)
90: vgatherdd/q Vx,Hx,Wx (66),(v)
91: vgatherqd/q Vx,Hx,Wx (66),(v)
92: vgatherdps/d Vx,Hx,Wx (66),(v)
93: vgatherqps/d Vx,Hx,Wx (66),(v)
94:
95:
96: vfmaddsub132ps/d Vx,Hx,Wx (66),(v)
97: vfmsubadd132ps/d Vx,Hx,Wx (66),(v)
98: vfmadd132ps/d Vx,Hx,Wx (66),(v)
99: vfmadd132ss/d Vx,Hx,Wx (66),(v),(v1)
9a: vfmsub132ps/d Vx,Hx,Wx (66),(v)
9b: vfmsub132ss/d Vx,Hx,Wx (66),(v),(v1)
9c: vfnmadd132ps/d Vx,Hx,Wx (66),(v)
9d: vfnmadd132ss/d Vx,Hx,Wx (66),(v),(v1)
9e: vfnmsub132ps/d Vx,Hx,Wx (66),(v)
9f: vfnmsub132ss/d Vx,Hx,Wx (66),(v),(v1)
a6: vfmaddsub213ps/d Vx,Hx,Wx (66),(v)
a7: vfmsubadd213ps/d Vx,Hx,Wx (66),(v)
a8: vfmadd213ps/d Vx,Hx,Wx (66),(v)
a9: vfmadd213ss/d Vx,Hx,Wx (66),(v),(v1)
aa: vfmsub213ps/d Vx,Hx,Wx (66),(v)
ab: vfmsub213ss/d Vx,Hx,Wx (66),(v),(v1)
ac: vfnmadd213ps/d Vx,Hx,Wx (66),(v)
ad: vfnmadd213ss/d Vx,Hx,Wx (66),(v),(v1)
ae: vfnmsub213ps/d Vx,Hx,Wx (66),(v)
af: vfnmsub213ss/d Vx,Hx,Wx (66),(v),(v1)
b6: vfmaddsub231ps/d Vx,Hx,Wx (66),(v)
b7: vfmsubadd231ps/d Vx,Hx,Wx (66),(v)
b8: vfmadd231ps/d Vx,Hx,Wx (66),(v)
b9: vfmadd231ss/d Vx,Hx,Wx (66),(v),(v1)
ba: vfmsub231ps/d Vx,Hx,Wx (66),(v)
bb: vfmsub231ss/d Vx,Hx,Wx (66),(v),(v1)
bc: vfnmadd231ps/d Vx,Hx,Wx (66),(v)
bd: vfnmadd231ss/d Vx,Hx,Wx (66),(v),(v1)
be: vfnmsub231ps/d Vx,Hx,Wx (66),(v)
bf: vfnmsub231ss/d Vx,Hx,Wx (66),(v),(v1)
# 0x0f 0x38 0xc0-0xff
c8: sha1nexte Vdq,Wdq
c9: sha1msg1 Vdq,Wdq
ca: sha1msg2 Vdq,Wdq
cb: sha256rnds2 Vdq,Wdq
cc: sha256msg1 Vdq,Wdq
cd: sha256msg2 Vdq,Wdq
db: VAESIMC Vdq,Wdq (66),(v1)
dc: VAESENC Vdq,Hdq,Wdq (66),(v1)
dd: VAESENCLAST Vdq,Hdq,Wdq (66),(v1)
de: VAESDEC Vdq,Hdq,Wdq (66),(v1)
df: VAESDECLAST Vdq,Hdq,Wdq (66),(v1)
f0: MOVBE Gy,My | MOVBE Gw,Mw (66) | CRC32 Gd,Eb (F2) | CRC32 Gd,Eb (66&F2)
f1: MOVBE My,Gy | MOVBE Mw,Gw (66) | CRC32 Gd,Ey (F2) | CRC32 Gd,Ew (66&F2)
f2: ANDN Gy,By,Ey (v)
f3: Grp17 (1A)
f5: BZHI Gy,Ey,By (v) | PEXT Gy,By,Ey (F3),(v) | PDEP Gy,By,Ey (F2),(v)
f6: ADCX Gy,Ey (66) | ADOX Gy,Ey (F3) | MULX By,Gy,rDX,Ey (F2),(v)
f7: BEXTR Gy,Ey,By (v) | SHLX Gy,Ey,By (66),(v) | SARX Gy,Ey,By (F3),(v) | SHRX Gy,Ey,By (F2),(v)
EndTable
Table: 3-byte opcode 2 (0x0f 0x3a)
Referrer: 3-byte escape 2
AVXcode: 3
# 0x0f 0x3a 0x00-0xff
00: vpermq Vqq,Wqq,Ib (66),(v)
01: vpermpd Vqq,Wqq,Ib (66),(v)
02: vpblendd Vx,Hx,Wx,Ib (66),(v)
03:
04: vpermilps Vx,Wx,Ib (66),(v)
05: vpermilpd Vx,Wx,Ib (66),(v)
06: vperm2f128 Vqq,Hqq,Wqq,Ib (66),(v)
07:
08: vroundps Vx,Wx,Ib (66)
09: vroundpd Vx,Wx,Ib (66)
0a: vroundss Vss,Wss,Ib (66),(v1)
0b: vroundsd Vsd,Wsd,Ib (66),(v1)
0c: vblendps Vx,Hx,Wx,Ib (66)
0d: vblendpd Vx,Hx,Wx,Ib (66)
0e: vpblendw Vx,Hx,Wx,Ib (66),(v1)
0f: palignr Pq,Qq,Ib | vpalignr Vx,Hx,Wx,Ib (66),(v1)
14: vpextrb Rd/Mb,Vdq,Ib (66),(v1)
15: vpextrw Rd/Mw,Vdq,Ib (66),(v1)
16: vpextrd/q Ey,Vdq,Ib (66),(v1)
17: vextractps Ed,Vdq,Ib (66),(v1)
18: vinsertf128 Vqq,Hqq,Wqq,Ib (66),(v)
19: vextractf128 Wdq,Vqq,Ib (66),(v)
1d: vcvtps2ph Wx,Vx,Ib (66),(v)
20: vpinsrb Vdq,Hdq,Ry/Mb,Ib (66),(v1)
21: vinsertps Vdq,Hdq,Udq/Md,Ib (66),(v1)
22: vpinsrd/q Vdq,Hdq,Ey,Ib (66),(v1)
38: vinserti128 Vqq,Hqq,Wqq,Ib (66),(v)
39: vextracti128 Wdq,Vqq,Ib (66),(v)
40: vdpps Vx,Hx,Wx,Ib (66)
41: vdppd Vdq,Hdq,Wdq,Ib (66),(v1)
42: vmpsadbw Vx,Hx,Wx,Ib (66),(v1)
44: vpclmulqdq Vdq,Hdq,Wdq,Ib (66),(v1)
46: vperm2i128 Vqq,Hqq,Wqq,Ib (66),(v)
4a: vblendvps Vx,Hx,Wx,Lx (66),(v)
4b: vblendvpd Vx,Hx,Wx,Lx (66),(v)
4c: vpblendvb Vx,Hx,Wx,Lx (66),(v1)
60: vpcmpestrm Vdq,Wdq,Ib (66),(v1)
61: vpcmpestri Vdq,Wdq,Ib (66),(v1)
62: vpcmpistrm Vdq,Wdq,Ib (66),(v1)
63: vpcmpistri Vdq,Wdq,Ib (66),(v1)
cc: sha1rnds4 Vdq,Wdq,Ib
df: VAESKEYGEN Vdq,Wdq,Ib (66),(v1)
f0: RORX Gy,Ey,Ib (F2),(v)
EndTable
GrpTable: Grp1
0: ADD
1: OR
2: ADC
3: SBB
4: AND
5: SUB
6: XOR
7: CMP
EndTable
GrpTable: Grp1A
0: POP
EndTable
GrpTable: Grp2
0: ROL
1: ROR
2: RCL
3: RCR
4: SHL/SAL
5: SHR
6:
7: SAR
EndTable
GrpTable: Grp3_1
0: TEST Eb,Ib
1:
2: NOT Eb
3: NEG Eb
4: MUL AL,Eb
5: IMUL AL,Eb
6: DIV AL,Eb
7: IDIV AL,Eb
EndTable
GrpTable: Grp3_2
0: TEST Ev,Iz
1:
2: NOT Ev
3: NEG Ev
4: MUL rAX,Ev
5: IMUL rAX,Ev
6: DIV rAX,Ev
7: IDIV rAX,Ev
EndTable
GrpTable: Grp4
0: INC Eb
1: DEC Eb
EndTable
GrpTable: Grp5
0: INC Ev
1: DEC Ev
# Note: "forced64" is Intel CPU behavior (see comment about CALL insn).
2: CALLN Ev (f64)
3: CALLF Ep
4: JMPN Ev (f64)
5: JMPF Mp
6: PUSH Ev (d64)
7:
EndTable
GrpTable: Grp6
0: SLDT Rv/Mw
1: STR Rv/Mw
2: LLDT Ew
3: LTR Ew
4: VERR Ew
5: VERW Ew
EndTable
GrpTable: Grp7
0: SGDT Ms | VMCALL (001),(11B) | VMLAUNCH (010),(11B) | VMRESUME (011),(11B) | VMXOFF (100),(11B)
1: SIDT Ms | MONITOR (000),(11B) | MWAIT (001),(11B) | CLAC (010),(11B) | STAC (011),(11B)
2: LGDT Ms | XGETBV (000),(11B) | XSETBV (001),(11B) | VMFUNC (100),(11B) | XEND (101)(11B) | XTEST (110)(11B)
3: LIDT Ms
4: SMSW Mw/Rv
5: rdpkru (110),(11B) | wrpkru (111),(11B)
6: LMSW Ew
7: INVLPG Mb | SWAPGS (o64),(000),(11B) | RDTSCP (001),(11B)
EndTable
GrpTable: Grp8
4: BT
5: BTS
6: BTR
7: BTC
EndTable
GrpTable: Grp9
1: CMPXCHG8B/16B Mq/Mdq
3: xrstors
4: xsavec
5: xsaves
6: VMPTRLD Mq | VMCLEAR Mq (66) | VMXON Mq (F3) | RDRAND Rv (11B)
7: VMPTRST Mq | VMPTRST Mq (F3) | RDSEED Rv (11B)
EndTable
GrpTable: Grp10
EndTable
# Grp11A and Grp11B are expressed as Grp11 in Intel SDM
GrpTable: Grp11A
0: MOV Eb,Ib
7: XABORT Ib (000),(11B)
EndTable
GrpTable: Grp11B
0: MOV Eb,Iz
7: XBEGIN Jz (000),(11B)
EndTable
GrpTable: Grp12
2: psrlw Nq,Ib (11B) | vpsrlw Hx,Ux,Ib (66),(11B),(v1)
4: psraw Nq,Ib (11B) | vpsraw Hx,Ux,Ib (66),(11B),(v1)
6: psllw Nq,Ib (11B) | vpsllw Hx,Ux,Ib (66),(11B),(v1)
EndTable
GrpTable: Grp13
2: psrld Nq,Ib (11B) | vpsrld Hx,Ux,Ib (66),(11B),(v1)
4: psrad Nq,Ib (11B) | vpsrad Hx,Ux,Ib (66),(11B),(v1)
6: pslld Nq,Ib (11B) | vpslld Hx,Ux,Ib (66),(11B),(v1)
EndTable
GrpTable: Grp14
2: psrlq Nq,Ib (11B) | vpsrlq Hx,Ux,Ib (66),(11B),(v1)
3: vpsrldq Hx,Ux,Ib (66),(11B),(v1)
6: psllq Nq,Ib (11B) | vpsllq Hx,Ux,Ib (66),(11B),(v1)
7: vpslldq Hx,Ux,Ib (66),(11B),(v1)
EndTable
GrpTable: Grp15
0: fxsave | RDFSBASE Ry (F3),(11B)
1: fxstor | RDGSBASE Ry (F3),(11B)
2: vldmxcsr Md (v1) | WRFSBASE Ry (F3),(11B)
3: vstmxcsr Md (v1) | WRGSBASE Ry (F3),(11B)
4: XSAVE
5: XRSTOR | lfence (11B)
6: XSAVEOPT | clwb (66) | mfence (11B)
7: clflush | clflushopt (66) | sfence (11B) | pcommit (66),(11B)
EndTable
GrpTable: Grp16
0: prefetch NTA
1: prefetch T0
2: prefetch T1
3: prefetch T2
EndTable
GrpTable: Grp17
1: BLSR By,Ey (v)
2: BLSMSK By,Ey (v)
3: BLSI By,Ey (v)
EndTable
# AMD's Prefetch Group
GrpTable: GrpP
0: PREFETCH
1: PREFETCHW
EndTable
GrpTable: GrpPDLK
0: MONTMUL
1: XSHA1
2: XSHA2
EndTable
GrpTable: GrpRNG
0: xstore-rng
1: xcrypt-ecb
2: xcrypt-cbc
4: xcrypt-cfb
5: xcrypt-ofb
EndTable
tools/objtool/builtin-check.c 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* objtool check:
*
* This command analyzes every .o file and ensures the validity of its stack
* trace metadata. It enforces a set of rules on asm code and C inline
* assembly code so that stack traces can be reliable.
*
* For more information, see tools/objtool/Documentation/stack-validation.txt.
*/
#include <string.h>
#include <subcmd/parse-options.h>
#include "builtin.h"
#include "elf.h"
#include "special.h"
#include "arch.h"
#include "warn.h"
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define STATE_FP_SAVED 0x1
#define STATE_FP_SETUP 0x2
#define STATE_FENTRY 0x4
struct instruction {
struct list_head list;
struct section *sec;
unsigned long offset;
unsigned int len, state;
unsigned char type;
unsigned long immediate;
bool alt_group, visited;
struct symbol *call_dest;
struct instruction *jump_dest;
struct list_head alts;
};
struct alternative {
struct list_head list;
struct instruction *insn;
};
struct objtool_file {
struct elf *elf;
struct list_head insns;
};
const char *objname;
static bool nofp;
static struct instruction *find_instruction(struct objtool_file *file,
struct section *sec,
unsigned long offset)
{
struct instruction *insn;
list_for_each_entry(insn, &file->insns, list)
if (insn->sec == sec && insn->offset == offset)
return insn;
return NULL;
}
/*
* Check if the function has been manually whitelisted with the
* STACK_FRAME_NON_STANDARD macro, or if it should be automatically whitelisted
* due to its use of a context switching instruction.
*/
static bool ignore_func(struct objtool_file *file, struct symbol *func)
{
struct section *macro_sec;
struct rela *rela;
struct instruction *insn;
/* check for STACK_FRAME_NON_STANDARD */
macro_sec = find_section_by_name(file->elf, "__func_stack_frame_non_standard");
if (macro_sec && macro_sec->rela)
list_for_each_entry(rela, &macro_sec->rela->relas, list)
if (rela->sym->sec == func->sec &&
rela->addend == func->offset)
return true;
/* check if it has a context switching instruction */
insn = find_instruction(file, func->sec, func->offset);
if (!insn)
return false;
list_for_each_entry_from(insn, &file->insns, list) {
if (insn->sec != func->sec ||
insn->offset >= func->offset + func->len)
break;
if (insn->type == INSN_CONTEXT_SWITCH)
return true;
}
return false;
}
/*
* This checks to see if the given function is a "noreturn" function.
*
* For global functions which are outside the scope of this object file, we
* have to keep a manual list of them.
*
* For local functions, we have to detect them manually by simply looking for
* the lack of a return instruction.
*/
static bool dead_end_function(struct objtool_file *file, struct symbol *func)
{
int i;
struct instruction *insn;
bool empty = true;
/*
* Unfortunately these have to be hard coded because the noreturn
* attribute isn't provided in ELF data.
*/
static const char * const global_noreturns[] = {
"__stack_chk_fail",
"panic",
"do_exit",
"__module_put_and_exit",
"complete_and_exit",
"kvm_spurious_fault",
"__reiserfs_panic",
"lbug_with_loc"
};
if (func->bind == STB_WEAK)
return false;
if (func->bind == STB_GLOBAL)
for (i = 0; i < ARRAY_SIZE(global_noreturns); i++)
if (!strcmp(func->name, global_noreturns[i]))
return true;
if (!func->sec)
return false;
insn = find_instruction(file, func->sec, func->offset);
if (!insn)
return false;
list_for_each_entry_from(insn, &file->insns, list) {
if (insn->sec != func->sec ||
insn->offset >= func->offset + func->len)
break;
empty = false;
if (insn->type == INSN_RETURN)
return false;
if (insn->type == INSN_JUMP_UNCONDITIONAL) {
struct instruction *dest = insn->jump_dest;
struct symbol *dest_func;
if (!dest)
/* sibling call to another file */
return false;
if (dest->sec != func->sec ||
dest->offset < func->offset ||
dest->offset >= func->offset + func->len) {
/* local sibling call */
dest_func = find_symbol_by_offset(dest->sec,
dest->offset);
if (!dest_func)
continue;
return dead_end_function(file, dest_func);
}
}
if (insn->type == INSN_JUMP_DYNAMIC)
/* sibling call */
return false;
}
return !empty;
}
/*
* Call the arch-specific instruction decoder for all the instructions and add
* them to the global insns list.
*/
static int decode_instructions(struct objtool_file *file)
{
struct section *sec;
unsigned long offset;
struct instruction *insn;
int ret;
INIT_LIST_HEAD(&file->insns);
list_for_each_entry(sec, &file->elf->sections, list) {
if (!(sec->sh.sh_flags & SHF_EXECINSTR))
continue;
for (offset = 0; offset < sec->len; offset += insn->len) {
insn = malloc(sizeof(*insn));
memset(insn, 0, sizeof(*insn));
INIT_LIST_HEAD(&insn->alts);
insn->sec = sec;
insn->offset = offset;
ret = arch_decode_instruction(file->elf, sec, offset,
sec->len - offset,
&insn->len, &insn->type,
&insn->immediate);
if (ret)
return ret;
if (!insn->type || insn->type > INSN_LAST) {
WARN_FUNC("invalid instruction type %d",
insn->sec, insn->offset, insn->type);
return -1;
}
list_add_tail(&insn->list, &file->insns);
}
}
return 0;
}
/*
* Warnings shouldn't be reported for ignored functions.
*/
static void get_ignores(struct objtool_file *file)
{
struct instruction *insn;
struct section *sec;
struct symbol *func;
list_for_each_entry(sec, &file->elf->sections, list) {
list_for_each_entry(func, &sec->symbols, list) {
if (func->type != STT_FUNC)
continue;
if (!ignore_func(file, func))
continue;
insn = find_instruction(file, sec, func->offset);
if (!insn)
continue;
list_for_each_entry_from(insn, &file->insns, list) {
if (insn->sec != func->sec ||
insn->offset >= func->offset + func->len)
break;
insn->visited = true;
}
}
}
}
/*
* Find the destination instructions for all jumps.
*/
static int get_jump_destinations(struct objtool_file *file)
{
struct instruction *insn;
struct rela *rela;
struct section *dest_sec;
unsigned long dest_off;
list_for_each_entry(insn, &file->insns, list) {
if (insn->type != INSN_JUMP_CONDITIONAL &&
insn->type != INSN_JUMP_UNCONDITIONAL)
continue;
/* skip ignores */
if (insn->visited)
continue;
rela = find_rela_by_dest_range(insn->sec, insn->offset,
insn->len);
if (!rela) {
dest_sec = insn->sec;
dest_off = insn->offset + insn->len + insn->immediate;
} else if (rela->sym->type == STT_SECTION) {
dest_sec = rela->sym->sec;
dest_off = rela->addend + 4;
} else if (rela->sym->sec->idx) {
dest_sec = rela->sym->sec;
dest_off = rela->sym->sym.st_value + rela->addend + 4;
} else {
/* sibling call */
insn->jump_dest = 0;
continue;
}
insn->jump_dest = find_instruction(file, dest_sec, dest_off);
if (!insn->jump_dest) {
/*
* This is a special case where an alt instruction
* jumps past the end of the section. These are
* handled later in handle_group_alt().
*/
if (!strcmp(insn->sec->name, ".altinstr_replacement"))
continue;
WARN_FUNC("can't find jump dest instruction at %s+0x%lx",
insn->sec, insn->offset, dest_sec->name,
dest_off);
return -1;
}
}
return 0;
}
/*
* Find the destination instructions for all calls.
*/
static int get_call_destinations(struct objtool_file *file)
{
struct instruction *insn;
unsigned long dest_off;
struct rela *rela;
list_for_each_entry(insn, &file->insns, list) {
if (insn->type != INSN_CALL)
continue;
rela = find_rela_by_dest_range(insn->sec, insn->offset,
insn->len);
if (!rela) {
dest_off = insn->offset + insn->len + insn->immediate;
insn->call_dest = find_symbol_by_offset(insn->sec,
dest_off);
if (!insn->call_dest) {
WARN_FUNC("can't find call dest symbol at offset 0x%lx",
insn->sec, insn->offset, dest_off);
return -1;
}
} else if (rela->sym->type == STT_SECTION) {
insn->call_dest = find_symbol_by_offset(rela->sym->sec,
rela->addend+4);
if (!insn->call_dest ||
insn->call_dest->type != STT_FUNC) {
WARN_FUNC("can't find call dest symbol at %s+0x%x",
insn->sec, insn->offset,
rela->sym->sec->name,
rela->addend + 4);
return -1;
}
} else
insn->call_dest = rela->sym;
}
return 0;
}
/*
* The .alternatives section requires some extra special care, over and above
* what other special sections require:
*
* 1. Because alternatives are patched in-place, we need to insert a fake jump
* instruction at the end so that validate_branch() skips all the original
* replaced instructions when validating the new instruction path.
*
* 2. An added wrinkle is that the new instruction length might be zero. In
* that case the old instructions are replaced with noops. We simulate that
* by creating a fake jump as the only new instruction.
*
* 3. In some cases, the alternative section includes an instruction which
* conditionally jumps to the _end_ of the entry. We have to modify these
* jumps' destinations to point back to .text rather than the end of the
* entry in .altinstr_replacement.
*
* 4. It has been requested that we don't validate the !POPCNT feature path
* which is a "very very small percentage of machines".
*/
static int handle_group_alt(struct objtool_file *file,
struct special_alt *special_alt,
struct instruction *orig_insn,
struct instruction **new_insn)
{
struct instruction *last_orig_insn, *last_new_insn, *insn, *fake_jump;
unsigned long dest_off;
last_orig_insn = NULL;
insn = orig_insn;
list_for_each_entry_from(insn, &file->insns, list) {
if (insn->sec != special_alt->orig_sec ||
insn->offset >= special_alt->orig_off + special_alt->orig_len)
break;
if (special_alt->skip_orig)
insn->type = INSN_NOP;
insn->alt_group = true;
last_orig_insn = insn;
}
if (list_is_last(&last_orig_insn->list, &file->insns) ||
list_next_entry(last_orig_insn, list)->sec != special_alt->orig_sec) {
WARN("%s: don't know how to handle alternatives at end of section",
special_alt->orig_sec->name);
return -1;
}
fake_jump = malloc(sizeof(*fake_jump));
if (!fake_jump) {
WARN("malloc failed");
return -1;
}
memset(fake_jump, 0, sizeof(*fake_jump));
INIT_LIST_HEAD(&fake_jump->alts);
fake_jump->sec = special_alt->new_sec;
fake_jump->offset = -1;
fake_jump->type = INSN_JUMP_UNCONDITIONAL;
fake_jump->jump_dest = list_next_entry(last_orig_insn, list);
if (!special_alt->new_len) {
*new_insn = fake_jump;
return 0;
}
last_new_insn = NULL;
insn = *new_insn;
list_for_each_entry_from(insn, &file->insns, list) {
if (insn->sec != special_alt->new_sec ||
insn->offset >= special_alt->new_off + special_alt->new_len)
break;
last_new_insn = insn;
if (insn->type != INSN_JUMP_CONDITIONAL &&
insn->type != INSN_JUMP_UNCONDITIONAL)
continue;
if (!insn->immediate)
continue;
dest_off = insn->offset + insn->len + insn->immediate;
if (dest_off == special_alt->new_off + special_alt->new_len)
insn->jump_dest = fake_jump;
if (!insn->jump_dest) {
WARN_FUNC("can't find alternative jump destination",
insn->sec, insn->offset);
return -1;
}
}
if (!last_new_insn) {
WARN_FUNC("can't find last new alternative instruction",
special_alt->new_sec, special_alt->new_off);
return -1;
}
list_add(&fake_jump->list, &last_new_insn->list);
return 0;
}
/*
* A jump table entry can either convert a nop to a jump or a jump to a nop.
* If the original instruction is a jump, make the alt entry an effective nop
* by just skipping the original instruction.
*/
static int handle_jump_alt(struct objtool_file *file,
struct special_alt *special_alt,
struct instruction *orig_insn,
struct instruction **new_insn)
{
if (orig_insn->type == INSN_NOP)
return 0;
if (orig_insn->type != INSN_JUMP_UNCONDITIONAL) {
WARN_FUNC("unsupported instruction at jump label",
orig_insn->sec, orig_insn->offset);
return -1;
}
*new_insn = list_next_entry(orig_insn, list);
return 0;
}
/*
* Read all the special sections which have alternate instructions which can be
* patched in or redirected to at runtime. Each instruction having alternate
* instruction(s) has them added to its insn->alts list, which will be
* traversed in validate_branch().
*/
static int get_special_section_alts(struct objtool_file *file)
{
struct list_head special_alts;
struct instruction *orig_insn, *new_insn;
struct special_alt *special_alt, *tmp;
struct alternative *alt;
int ret;
ret = special_get_alts(file->elf, &special_alts);
if (ret)
return ret;
list_for_each_entry_safe(special_alt, tmp, &special_alts, list) {
alt = malloc(sizeof(*alt));
if (!alt) {
WARN("malloc failed");
ret = -1;
goto out;
}
orig_insn = find_instruction(file, special_alt->orig_sec,
special_alt->orig_off);
if (!orig_insn) {
WARN_FUNC("special: can't find orig instruction",
special_alt->orig_sec, special_alt->orig_off);
ret = -1;
goto out;
}
new_insn = NULL;
if (!special_alt->group || special_alt->new_len) {
new_insn = find_instruction(file, special_alt->new_sec,
special_alt->new_off);
if (!new_insn) {
WARN_FUNC("special: can't find new instruction",
special_alt->new_sec,
special_alt->new_off);
ret = -1;
goto out;
}
}
if (special_alt->group) {
ret = handle_group_alt(file, special_alt, orig_insn,
&new_insn);
if (ret)
goto out;
} else if (special_alt->jump_or_nop) {
ret = handle_jump_alt(file, special_alt, orig_insn,
&new_insn);
if (ret)
goto out;
}
alt->insn = new_insn;
list_add_tail(&alt->list, &orig_insn->alts);
list_del(&special_alt->list);
free(special_alt);
}
out:
return ret;
}
/*
* For some switch statements, gcc generates a jump table in the .rodata
* section which contains a list of addresses within the function to jump to.
* This finds these jump tables and adds them to the insn->alts lists.
*/
static int get_switch_alts(struct objtool_file *file)
{
struct instruction *insn, *alt_insn;
struct rela *rodata_rela, *rela;
struct section *rodata;
struct symbol *func;
struct alternative *alt;
list_for_each_entry(insn, &file->insns, list) {
if (insn->type != INSN_JUMP_DYNAMIC)
continue;
rodata_rela = find_rela_by_dest_range(insn->sec, insn->offset,
insn->len);
if (!rodata_rela || strcmp(rodata_rela->sym->name, ".rodata"))
continue;
rodata = find_section_by_name(file->elf, ".rodata");
if (!rodata || !rodata->rela)
continue;
/* common case: jmpq *[addr](,%rax,8) */
rela = find_rela_by_dest(rodata, rodata_rela->addend);
/* rare case: jmpq *[addr](%rip) */
if (!rela)
rela = find_rela_by_dest(rodata,
rodata_rela->addend + 4);
if (!rela)
continue;
func = find_containing_func(insn->sec, insn->offset);
if (!func) {
WARN_FUNC("can't find containing func",
insn->sec, insn->offset);
return -1;
}
list_for_each_entry_from(rela, &rodata->rela->relas, list) {
if (rela->sym->sec != insn->sec ||
rela->addend <= func->offset ||
rela->addend >= func->offset + func->len)
break;
alt_insn = find_instruction(file, insn->sec,
rela->addend);
if (!alt_insn) {
WARN("%s: can't find instruction at %s+0x%x",
rodata->rela->name, insn->sec->name,
rela->addend);
return -1;
}
alt = malloc(sizeof(*alt));
if (!alt) {
WARN("malloc failed");
return -1;
}
alt->insn = alt_insn;
list_add_tail(&alt->list, &insn->alts);
}
}
return 0;
}
static int decode_sections(struct objtool_file *file)
{
int ret;
ret = decode_instructions(file);
if (ret)
return ret;
get_ignores(file);
ret = get_jump_destinations(file);
if (ret)
return ret;
ret = get_call_destinations(file);
if (ret)
return ret;
ret = get_special_section_alts(file);
if (ret)
return ret;
ret = get_switch_alts(file);
if (ret)
return ret;
return 0;
}
static bool is_fentry_call(struct instruction *insn)
{
if (insn->type == INSN_CALL &&
insn->call_dest->type == STT_NOTYPE &&
!strcmp(insn->call_dest->name, "__fentry__"))
return true;
return false;
}
static bool has_modified_stack_frame(struct instruction *insn)
{
return (insn->state & STATE_FP_SAVED) ||
(insn->state & STATE_FP_SETUP);
}
static bool has_valid_stack_frame(struct instruction *insn)
{
return (insn->state & STATE_FP_SAVED) &&
(insn->state & STATE_FP_SETUP);
}
/*
* Follow the branch starting at the given instruction, and recursively follow
* any other branches (jumps). Meanwhile, track the frame pointer state at
* each instruction and validate all the rules described in
* tools/objtool/Documentation/stack-validation.txt.
*/
static int validate_branch(struct objtool_file *file,
struct instruction *first, unsigned char first_state)
{
struct alternative *alt;
struct instruction *insn;
struct section *sec;
unsigned char state;
int ret, warnings = 0;
insn = first;
sec = insn->sec;
state = first_state;
if (insn->alt_group && list_empty(&insn->alts)) {
WARN_FUNC("don't know how to handle branch to middle of alternative instruction group",
sec, insn->offset);
warnings++;
}
while (1) {
if (insn->visited) {
if (insn->state != state) {
WARN_FUNC("frame pointer state mismatch",
sec, insn->offset);
warnings++;
}
return warnings;
}
/*
* Catch a rare case where a noreturn function falls through to
* the next function.
*/
if (is_fentry_call(insn) && (state & STATE_FENTRY))
return warnings;
insn->visited = true;
insn->state = state;
list_for_each_entry(alt, &insn->alts, list) {
ret = validate_branch(file, alt->insn, state);
warnings += ret;
}
switch (insn->type) {
case INSN_FP_SAVE:
if (!nofp) {
if (state & STATE_FP_SAVED) {
WARN_FUNC("duplicate frame pointer save",
sec, insn->offset);
warnings++;
}
state |= STATE_FP_SAVED;
}
break;
case INSN_FP_SETUP:
if (!nofp) {
if (state & STATE_FP_SETUP) {
WARN_FUNC("duplicate frame pointer setup",
sec, insn->offset);
warnings++;
}
state |= STATE_FP_SETUP;
}
break;
case INSN_FP_RESTORE:
if (!nofp) {
if (has_valid_stack_frame(insn))
state &= ~STATE_FP_SETUP;
state &= ~STATE_FP_SAVED;
}
break;
case INSN_RETURN:
if (!nofp && has_modified_stack_frame(insn)) {
WARN_FUNC("return without frame pointer restore",
sec, insn->offset);
warnings++;
}
return warnings;
case INSN_CALL:
if (is_fentry_call(insn)) {
state |= STATE_FENTRY;
break;
}
if (dead_end_function(file, insn->call_dest))
return warnings;
/* fallthrough */
case INSN_CALL_DYNAMIC:
if (!nofp && !has_valid_stack_frame(insn)) {
WARN_FUNC("call without frame pointer save/setup",
sec, insn->offset);
warnings++;
}
break;
case INSN_JUMP_CONDITIONAL:
case INSN_JUMP_UNCONDITIONAL:
if (insn->jump_dest) {
ret = validate_branch(file, insn->jump_dest,
state);
warnings += ret;
} else if (has_modified_stack_frame(insn)) {
WARN_FUNC("sibling call from callable instruction with changed frame pointer",
sec, insn->offset);
warnings++;
} /* else it's a sibling call */
if (insn->type == INSN_JUMP_UNCONDITIONAL)
return warnings;
break;
case INSN_JUMP_DYNAMIC:
if (list_empty(&insn->alts) &&
has_modified_stack_frame(insn)) {
WARN_FUNC("sibling call from callable instruction with changed frame pointer",
sec, insn->offset);
warnings++;
}
return warnings;
case INSN_BUG:
return warnings;
default:
break;
}
insn = list_next_entry(insn, list);
if (&insn->list == &file->insns || insn->sec != sec) {
WARN("%s: unexpected end of section", sec->name);
warnings++;
return warnings;
}
}
return warnings;
}
static bool is_gcov_insn(struct instruction *insn)
{
struct rela *rela;
struct section *sec;
struct symbol *sym;
unsigned long offset;
rela = find_rela_by_dest_range(insn->sec, insn->offset, insn->len);
if (!rela)
return false;
if (rela->sym->type != STT_SECTION)
return false;
sec = rela->sym->sec;
offset = rela->addend + insn->offset + insn->len - rela->offset;
list_for_each_entry(sym, &sec->symbols, list) {
if (sym->type != STT_OBJECT)
continue;
if (offset >= sym->offset && offset < sym->offset + sym->len)
return (!memcmp(sym->name, "__gcov0.", 8));
}
return false;
}
static bool is_kasan_insn(struct instruction *insn)
{
return (insn->type == INSN_CALL &&
!strcmp(insn->call_dest->name, "__asan_handle_no_return"));
}
static bool is_ubsan_insn(struct instruction *insn)
{
return (insn->type == INSN_CALL &&
!strcmp(insn->call_dest->name,
"__ubsan_handle_builtin_unreachable"));
}
static bool ignore_unreachable_insn(struct instruction *insn,
unsigned long func_end)
{
int i;
if (insn->type == INSN_NOP)
return true;
if (is_gcov_insn(insn))
return true;
/*
* Check if this (or a subsequent) instruction is related to
* CONFIG_UBSAN or CONFIG_KASAN.
*
* End the search at 5 instructions to avoid going into the weeds.
*/
for (i = 0; i < 5; i++) {
if (is_kasan_insn(insn) || is_ubsan_insn(insn))
return true;
if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest) {
insn = insn->jump_dest;
continue;
}
if (insn->offset + insn->len >= func_end)
break;
insn = list_next_entry(insn, list);
}
return false;
}
static int validate_functions(struct objtool_file *file)
{
struct section *sec;
struct symbol *func;
struct instruction *insn;
unsigned long func_end;
int ret, warnings = 0;
list_for_each_entry(sec, &file->elf->sections, list) {
list_for_each_entry(func, &sec->symbols, list) {
if (func->type != STT_FUNC)
continue;
insn = find_instruction(file, sec, func->offset);
if (!insn) {
WARN("%s(): can't find starting instruction",
func->name);
warnings++;
continue;
}
ret = validate_branch(file, insn, 0);
warnings += ret;
}
}
list_for_each_entry(sec, &file->elf->sections, list) {
list_for_each_entry(func, &sec->symbols, list) {
if (func->type != STT_FUNC)
continue;
insn = find_instruction(file, sec, func->offset);
if (!insn)
continue;
func_end = func->offset + func->len;
list_for_each_entry_from(insn, &file->insns, list) {
if (insn->sec != func->sec ||
insn->offset >= func_end)
break;
if (insn->visited)
continue;
if (!ignore_unreachable_insn(insn, func_end)) {
WARN_FUNC("function has unreachable instruction", insn->sec, insn->offset);
warnings++;
}
insn->visited = true;
}
}
}
return warnings;
}
static int validate_uncallable_instructions(struct objtool_file *file)
{
struct instruction *insn;
int warnings = 0;
list_for_each_entry(insn, &file->insns, list) {
if (!insn->visited && insn->type == INSN_RETURN) {
WARN_FUNC("return instruction outside of a callable function",
insn->sec, insn->offset);
warnings++;
}
}
return warnings;
}
static void cleanup(struct objtool_file *file)
{
struct instruction *insn, *tmpinsn;
struct alternative *alt, *tmpalt;
list_for_each_entry_safe(insn, tmpinsn, &file->insns, list) {
list_for_each_entry_safe(alt, tmpalt, &insn->alts, list) {
list_del(&alt->list);
free(alt);
}
list_del(&insn->list);
free(insn);
}
elf_close(file->elf);
}
const char * const check_usage[] = {
"objtool check [<options>] file.o",
NULL,
};
int cmd_check(int argc, const char **argv)
{
struct objtool_file file;
int ret, warnings = 0;
const struct option options[] = {
OPT_BOOLEAN('f', "no-fp", &nofp, "Skip frame pointer validation"),
OPT_END(),
};
argc = parse_options(argc, argv, options, check_usage, 0);
if (argc != 1)
usage_with_options(check_usage, options);
objname = argv[0];
file.elf = elf_open(objname);
if (!file.elf) {
fprintf(stderr, "error reading elf file %s\n", objname);
return 1;
}
INIT_LIST_HEAD(&file.insns);
ret = decode_sections(&file);
if (ret < 0)
goto out;
warnings += ret;
ret = validate_functions(&file);
if (ret < 0)
goto out;
warnings += ret;
ret = validate_uncallable_instructions(&file);
if (ret < 0)
goto out;
warnings += ret;
out:
cleanup(&file);
/* ignore warnings for now until we get all the code cleaned up */
if (ret || warnings)
return 0;
return 0;
}
tools/objtool/builtin.h 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _BUILTIN_H
#define _BUILTIN_H
extern int cmd_check(int argc, const char **argv);
#endif /* _BUILTIN_H */
tools/objtool/elf.c 0 → 100644
View file @ 442f04c3
/*
* elf.c - ELF access library
*
* Adapted from kpatch (https://github.com/dynup/kpatch):
* Copyright (C) 2013-2015 Josh Poimboeuf <jpoimboe@redhat.com>
* Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "elf.h"
#include "warn.h"
struct section *find_section_by_name(struct elf *elf, const char *name)
{
struct section *sec;
list_for_each_entry(sec, &elf->sections, list)
if (!strcmp(sec->name, name))
return sec;
return NULL;
}
static struct section *find_section_by_index(struct elf *elf,
unsigned int idx)
{
struct section *sec;
list_for_each_entry(sec, &elf->sections, list)
if (sec->idx == idx)
return sec;
return NULL;
}
static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx)
{
struct section *sec;
struct symbol *sym;
list_for_each_entry(sec, &elf->sections, list)
list_for_each_entry(sym, &sec->symbols, list)
if (sym->idx == idx)
return sym;
return NULL;
}
struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)
{
struct symbol *sym;
list_for_each_entry(sym, &sec->symbols, list)
if (sym->type != STT_SECTION &&
sym->offset == offset)
return sym;
return NULL;
}
struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
unsigned int len)
{
struct rela *rela;
if (!sec->rela)
return NULL;
list_for_each_entry(rela, &sec->rela->relas, list)
if (rela->offset >= offset && rela->offset < offset + len)
return rela;
return NULL;
}
struct rela *find_rela_by_dest(struct section *sec, unsigned long offset)
{
return find_rela_by_dest_range(sec, offset, 1);
}
struct symbol *find_containing_func(struct section *sec, unsigned long offset)
{
struct symbol *func;
list_for_each_entry(func, &sec->symbols, list)
if (func->type == STT_FUNC && offset >= func->offset &&
offset < func->offset + func->len)
return func;
return NULL;
}
static int read_sections(struct elf *elf)
{
Elf_Scn *s = NULL;
struct section *sec;
size_t shstrndx, sections_nr;
int i;
if (elf_getshdrnum(elf->elf, &sections_nr)) {
perror("elf_getshdrnum");
return -1;
}
if (elf_getshdrstrndx(elf->elf, &shstrndx)) {
perror("elf_getshdrstrndx");
return -1;
}
for (i = 0; i < sections_nr; i++) {
sec = malloc(sizeof(*sec));
if (!sec) {
perror("malloc");
return -1;
}
memset(sec, 0, sizeof(*sec));
INIT_LIST_HEAD(&sec->symbols);
INIT_LIST_HEAD(&sec->relas);
list_add_tail(&sec->list, &elf->sections);
s = elf_getscn(elf->elf, i);
if (!s) {
perror("elf_getscn");
return -1;
}
sec->idx = elf_ndxscn(s);
if (!gelf_getshdr(s, &sec->sh)) {
perror("gelf_getshdr");
return -1;
}
sec->name = elf_strptr(elf->elf, shstrndx, sec->sh.sh_name);
if (!sec->name) {
perror("elf_strptr");
return -1;
}
sec->elf_data = elf_getdata(s, NULL);
if (!sec->elf_data) {
perror("elf_getdata");
return -1;
}
if (sec->elf_data->d_off != 0 ||
sec->elf_data->d_size != sec->sh.sh_size) {
WARN("unexpected data attributes for %s", sec->name);
return -1;
}
sec->data = (unsigned long)sec->elf_data->d_buf;
sec->len = sec->elf_data->d_size;
}
/* sanity check, one more call to elf_nextscn() should return NULL */
if (elf_nextscn(elf->elf, s)) {
WARN("section entry mismatch");
return -1;
}
return 0;
}
static int read_symbols(struct elf *elf)
{
struct section *symtab;
struct symbol *sym;
struct list_head *entry, *tmp;
int symbols_nr, i;
symtab = find_section_by_name(elf, ".symtab");
if (!symtab) {
WARN("missing symbol table");
return -1;
}
symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize;
for (i = 0; i < symbols_nr; i++) {
sym = malloc(sizeof(*sym));
if (!sym) {
perror("malloc");
return -1;
}
memset(sym, 0, sizeof(*sym));
sym->idx = i;
if (!gelf_getsym(symtab->elf_data, i, &sym->sym)) {
perror("gelf_getsym");
goto err;
}
sym->name = elf_strptr(elf->elf, symtab->sh.sh_link,
sym->sym.st_name);
if (!sym->name) {
perror("elf_strptr");
goto err;
}
sym->type = GELF_ST_TYPE(sym->sym.st_info);
sym->bind = GELF_ST_BIND(sym->sym.st_info);
if (sym->sym.st_shndx > SHN_UNDEF &&
sym->sym.st_shndx < SHN_LORESERVE) {
sym->sec = find_section_by_index(elf,
sym->sym.st_shndx);
if (!sym->sec) {
WARN("couldn't find section for symbol %s",
sym->name);
goto err;
}
if (sym->type == STT_SECTION) {
sym->name = sym->sec->name;
sym->sec->sym = sym;
}
} else
sym->sec = find_section_by_index(elf, 0);
sym->offset = sym->sym.st_value;
sym->len = sym->sym.st_size;
/* sorted insert into a per-section list */
entry = &sym->sec->symbols;
list_for_each_prev(tmp, &sym->sec->symbols) {
struct symbol *s;
s = list_entry(tmp, struct symbol, list);
if (sym->offset > s->offset) {
entry = tmp;
break;
}
if (sym->offset == s->offset && sym->len >= s->len) {
entry = tmp;
break;
}
}
list_add(&sym->list, entry);
}
return 0;
err:
free(sym);
return -1;
}
static int read_relas(struct elf *elf)
{
struct section *sec;
struct rela *rela;
int i;
unsigned int symndx;
list_for_each_entry(sec, &elf->sections, list) {
if (sec->sh.sh_type != SHT_RELA)
continue;
sec->base = find_section_by_name(elf, sec->name + 5);
if (!sec->base) {
WARN("can't find base section for rela section %s",
sec->name);
return -1;
}
sec->base->rela = sec;
for (i = 0; i < sec->sh.sh_size / sec->sh.sh_entsize; i++) {
rela = malloc(sizeof(*rela));
if (!rela) {
perror("malloc");
return -1;
}
memset(rela, 0, sizeof(*rela));
list_add_tail(&rela->list, &sec->relas);
if (!gelf_getrela(sec->elf_data, i, &rela->rela)) {
perror("gelf_getrela");
return -1;
}
rela->type = GELF_R_TYPE(rela->rela.r_info);
rela->addend = rela->rela.r_addend;
rela->offset = rela->rela.r_offset;
symndx = GELF_R_SYM(rela->rela.r_info);
rela->sym = find_symbol_by_index(elf, symndx);
if (!rela->sym) {
WARN("can't find rela entry symbol %d for %s",
symndx, sec->name);
return -1;
}
}
}
return 0;
}
struct elf *elf_open(const char *name)
{
struct elf *elf;
elf_version(EV_CURRENT);
elf = malloc(sizeof(*elf));
if (!elf) {
perror("malloc");
return NULL;
}
memset(elf, 0, sizeof(*elf));
INIT_LIST_HEAD(&elf->sections);
elf->name = strdup(name);
if (!elf->name) {
perror("strdup");
goto err;
}
elf->fd = open(name, O_RDONLY);
if (elf->fd == -1) {
perror("open");
goto err;
}
elf->elf = elf_begin(elf->fd, ELF_C_READ_MMAP, NULL);
if (!elf->elf) {
perror("elf_begin");
goto err;
}
if (!gelf_getehdr(elf->elf, &elf->ehdr)) {
perror("gelf_getehdr");
goto err;
}
if (read_sections(elf))
goto err;
if (read_symbols(elf))
goto err;
if (read_relas(elf))
goto err;
return elf;
err:
elf_close(elf);
return NULL;
}
void elf_close(struct elf *elf)
{
struct section *sec, *tmpsec;
struct symbol *sym, *tmpsym;
struct rela *rela, *tmprela;
list_for_each_entry_safe(sec, tmpsec, &elf->sections, list) {
list_for_each_entry_safe(sym, tmpsym, &sec->symbols, list) {
list_del(&sym->list);
free(sym);
}
list_for_each_entry_safe(rela, tmprela, &sec->relas, list) {
list_del(&rela->list);
free(rela);
}
list_del(&sec->list);
free(sec);
}
if (elf->name)
free(elf->name);
if (elf->fd > 0)
close(elf->fd);
if (elf->elf)
elf_end(elf->elf);
free(elf);
}
tools/objtool/elf.h 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _OBJTOOL_ELF_H
#define _OBJTOOL_ELF_H
#include <stdio.h>
#include <gelf.h>
#include <linux/list.h>
struct section {
struct list_head list;
GElf_Shdr sh;
struct list_head symbols;
struct list_head relas;
struct section *base, *rela;
struct symbol *sym;
Elf_Data *elf_data;
char *name;
int idx;
unsigned long data;
unsigned int len;
};
struct symbol {
struct list_head list;
GElf_Sym sym;
struct section *sec;
char *name;
int idx;
unsigned char bind, type;
unsigned long offset;
unsigned int len;
};
struct rela {
struct list_head list;
GElf_Rela rela;
struct symbol *sym;
unsigned int type;
int offset;
int addend;
};
struct elf {
Elf *elf;
GElf_Ehdr ehdr;
int fd;
char *name;
struct list_head sections;
};
struct elf *elf_open(const char *name);
struct section *find_section_by_name(struct elf *elf, const char *name);
struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
unsigned int len);
struct symbol *find_containing_func(struct section *sec, unsigned long offset);
void elf_close(struct elf *elf);
#endif /* _OBJTOOL_ELF_H */
tools/objtool/objtool.c 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* objtool:
*
* The 'check' subcmd analyzes every .o file and ensures the validity of its
* stack trace metadata. It enforces a set of rules on asm code and C inline
* assembly code so that stack traces can be reliable.
*
* For more information, see tools/objtool/Documentation/stack-validation.txt.
*/
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <subcmd/exec-cmd.h>
#include <subcmd/pager.h>
#include "builtin.h"
#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
struct cmd_struct {
const char *name;
int (*fn)(int, const char **);
const char *help;
};
static const char objtool_usage_string[] =
"objtool [OPTIONS] COMMAND [ARGS]";
static struct cmd_struct objtool_cmds[] = {
{"check", cmd_check, "Perform stack metadata validation on an object file" },
};
bool help;
static void cmd_usage(void)
{
unsigned int i, longest = 0;
printf("\n usage: %s\n\n", objtool_usage_string);
for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
if (longest < strlen(objtool_cmds[i].name))
longest = strlen(objtool_cmds[i].name);
}
puts(" Commands:");
for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
printf(" %-*s ", longest, objtool_cmds[i].name);
puts(objtool_cmds[i].help);
}
printf("\n");
exit(1);
}
static void handle_options(int *argc, const char ***argv)
{
while (*argc > 0) {
const char *cmd = (*argv)[0];
if (cmd[0] != '-')
break;
if (!strcmp(cmd, "--help") || !strcmp(cmd, "-h")) {
help = true;
break;
} else {
fprintf(stderr, "Unknown option: %s\n", cmd);
fprintf(stderr, "\n Usage: %s\n",
objtool_usage_string);
exit(1);
}
(*argv)++;
(*argc)--;
}
}
static void handle_internal_command(int argc, const char **argv)
{
const char *cmd = argv[0];
unsigned int i, ret;
for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
struct cmd_struct *p = objtool_cmds+i;
if (strcmp(p->name, cmd))
continue;
ret = p->fn(argc, argv);
exit(ret);
}
cmd_usage();
}
int main(int argc, const char **argv)
{
static const char *UNUSED = "OBJTOOL_NOT_IMPLEMENTED";
/* libsubcmd init */
exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
pager_init(UNUSED);
argv++;
argc--;
handle_options(&argc, &argv);
if (!argc || help)
cmd_usage();
handle_internal_command(argc, argv);
return 0;
}
tools/objtool/special.c 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* This file reads all the special sections which have alternate instructions
* which can be patched in or redirected to at runtime.
*/
#include <stdlib.h>
#include <string.h>
#include "special.h"
#include "warn.h"
#define EX_ENTRY_SIZE 12
#define EX_ORIG_OFFSET 0
#define EX_NEW_OFFSET 4
#define JUMP_ENTRY_SIZE 24
#define JUMP_ORIG_OFFSET 0
#define JUMP_NEW_OFFSET 8
#define ALT_ENTRY_SIZE 13
#define ALT_ORIG_OFFSET 0
#define ALT_NEW_OFFSET 4
#define ALT_FEATURE_OFFSET 8
#define ALT_ORIG_LEN_OFFSET 10
#define ALT_NEW_LEN_OFFSET 11
#define X86_FEATURE_POPCNT (4*32+23)
struct special_entry {
const char *sec;
bool group, jump_or_nop;
unsigned char size, orig, new;
unsigned char orig_len, new_len; /* group only */
unsigned char feature; /* ALTERNATIVE macro CPU feature */
};
struct special_entry entries[] = {
{
.sec = ".altinstructions",
.group = true,
.size = ALT_ENTRY_SIZE,
.orig = ALT_ORIG_OFFSET,
.orig_len = ALT_ORIG_LEN_OFFSET,
.new = ALT_NEW_OFFSET,
.new_len = ALT_NEW_LEN_OFFSET,
.feature = ALT_FEATURE_OFFSET,
},
{
.sec = "__jump_table",
.jump_or_nop = true,
.size = JUMP_ENTRY_SIZE,
.orig = JUMP_ORIG_OFFSET,
.new = JUMP_NEW_OFFSET,
},
{
.sec = "__ex_table",
.size = EX_ENTRY_SIZE,
.orig = EX_ORIG_OFFSET,
.new = EX_NEW_OFFSET,
},
{},
};
static int get_alt_entry(struct elf *elf, struct special_entry *entry,
struct section *sec, int idx,
struct special_alt *alt)
{
struct rela *orig_rela, *new_rela;
unsigned long offset;
offset = idx * entry->size;
alt->group = entry->group;
alt->jump_or_nop = entry->jump_or_nop;
if (alt->group) {
alt->orig_len = *(unsigned char *)(sec->data + offset +
entry->orig_len);
alt->new_len = *(unsigned char *)(sec->data + offset +
entry->new_len);
}
if (entry->feature) {
unsigned short feature;
feature = *(unsigned short *)(sec->data + offset +
entry->feature);
/*
* It has been requested that we don't validate the !POPCNT
* feature path which is a "very very small percentage of
* machines".
*/
if (feature == X86_FEATURE_POPCNT)
alt->skip_orig = true;
}
orig_rela = find_rela_by_dest(sec, offset + entry->orig);
if (!orig_rela) {
WARN_FUNC("can't find orig rela", sec, offset + entry->orig);
return -1;
}
if (orig_rela->sym->type != STT_SECTION) {
WARN_FUNC("don't know how to handle non-section rela symbol %s",
sec, offset + entry->orig, orig_rela->sym->name);
return -1;
}
alt->orig_sec = orig_rela->sym->sec;
alt->orig_off = orig_rela->addend;
if (!entry->group || alt->new_len) {
new_rela = find_rela_by_dest(sec, offset + entry->new);
if (!new_rela) {
WARN_FUNC("can't find new rela",
sec, offset + entry->new);
return -1;
}
alt->new_sec = new_rela->sym->sec;
alt->new_off = (unsigned int)new_rela->addend;
/* _ASM_EXTABLE_EX hack */
if (alt->new_off >= 0x7ffffff0)
alt->new_off -= 0x7ffffff0;
}
return 0;
}
/*
* Read all the special sections and create a list of special_alt structs which
* describe all the alternate instructions which can be patched in or
* redirected to at runtime.
*/
int special_get_alts(struct elf *elf, struct list_head *alts)
{
struct special_entry *entry;
struct section *sec;
unsigned int nr_entries;
struct special_alt *alt;
int idx, ret;
INIT_LIST_HEAD(alts);
for (entry = entries; entry->sec; entry++) {
sec = find_section_by_name(elf, entry->sec);
if (!sec)
continue;
if (sec->len % entry->size != 0) {
WARN("%s size not a multiple of %d",
sec->name, entry->size);
return -1;
}
nr_entries = sec->len / entry->size;
for (idx = 0; idx < nr_entries; idx++) {
alt = malloc(sizeof(*alt));
if (!alt) {
WARN("malloc failed");
return -1;
}
memset(alt, 0, sizeof(*alt));
ret = get_alt_entry(elf, entry, sec, idx, alt);
if (ret)
return ret;
list_add_tail(&alt->list, alts);
}
}
return 0;
}
tools/objtool/special.h 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _SPECIAL_H
#define _SPECIAL_H
#include <stdbool.h>
#include "elf.h"
struct special_alt {
struct list_head list;
bool group;
bool skip_orig;
bool jump_or_nop;
struct section *orig_sec;
unsigned long orig_off;
struct section *new_sec;
unsigned long new_off;
unsigned int orig_len, new_len; /* group only */
};
int special_get_alts(struct elf *elf, struct list_head *alts);
#endif /* _SPECIAL_H */
tools/objtool/warn.h 0 → 100644
View file @ 442f04c3
/*
* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _WARN_H
#define _WARN_H
extern const char *objname;
static inline char *offstr(struct section *sec, unsigned long offset)
{
struct symbol *func;
char *name, *str;
unsigned long name_off;
func = find_containing_func(sec, offset);
if (func) {
name = func->name;
name_off = offset - func->offset;
} else {
name = sec->name;
name_off = offset;
}
str = malloc(strlen(name) + 20);
if (func)
sprintf(str, "%s()+0x%lx", name, name_off);
else
sprintf(str, "%s+0x%lx", name, name_off);
return str;
}
#define WARN(format, ...) \
fprintf(stderr, \
"%s: warning: objtool: " format "\n", \
objname, ##__VA_ARGS__)
#define WARN_FUNC(format, sec, offset, ...) \
({ \
char *_str = offstr(sec, offset); \
WARN("%s: " format, _str, ##__VA_ARGS__); \
free(_str); \
})
#endif /* _WARN_H */
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