Commit 24759481 authored by Richard Henderson's avatar Richard Henderson

Fix unwind info for sysenter entry point.

Add unwind info for sigreturn entry points.
parent 1dbc2a79
......@@ -114,6 +114,15 @@ zdisk bzdisk: vmlinux
install fdimage fdimage144 fdimage288: vmlinux
$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(BOOTIMAGE) $@
prepare: include/asm-$(ARCH)/asm_offsets.h
CLEAN_FILES += include/asm-$(ARCH)/asm_offsets.h
arch/$(ARCH)/kernel/asm-offsets.s: include/asm include/linux/version.h \
include/config/MARKER
include/asm-$(ARCH)/asm_offsets.h: arch/$(ARCH)/kernel/asm-offsets.s
$(call filechk,gen-asm-offsets)
archclean:
$(Q)$(MAKE) $(clean)=arch/i386/boot
......
/*
* Generate definitions needed by assembly language modules.
* This code generates raw asm output which is post-processed
* to extract and format the required data.
*/
#include <linux/signal.h>
#include <asm/ucontext.h>
#include "sigframe.h"
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))
#define BLANK() asm volatile("\n->" : : )
void foo(void)
{
DEFINE(SIGCONTEXT_eax, offsetof (struct sigcontext, eax));
DEFINE(SIGCONTEXT_ebx, offsetof (struct sigcontext, ebx));
DEFINE(SIGCONTEXT_ecx, offsetof (struct sigcontext, ecx));
DEFINE(SIGCONTEXT_edx, offsetof (struct sigcontext, edx));
DEFINE(SIGCONTEXT_esi, offsetof (struct sigcontext, esi));
DEFINE(SIGCONTEXT_edi, offsetof (struct sigcontext, edi));
DEFINE(SIGCONTEXT_ebp, offsetof (struct sigcontext, ebp));
DEFINE(SIGCONTEXT_esp, offsetof (struct sigcontext, esp));
DEFINE(SIGCONTEXT_eip, offsetof (struct sigcontext, eip));
BLANK();
DEFINE(RT_SIGFRAME_sigcontext,
offsetof (struct rt_sigframe, uc.uc_mcontext));
}
struct sigframe
{
char *pretcode;
int sig;
struct sigcontext sc;
struct _fpstate fpstate;
unsigned long extramask[_NSIG_WORDS-1];
char retcode[8];
};
struct rt_sigframe
{
char *pretcode;
int sig;
struct siginfo *pinfo;
void *puc;
struct siginfo info;
struct ucontext uc;
struct _fpstate fpstate;
char retcode[8];
};
......@@ -23,6 +23,7 @@
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/i387.h>
#include "sigframe.h"
#define DEBUG_SIG 0
......@@ -126,28 +127,6 @@ sys_sigaltstack(const stack_t *uss, stack_t *uoss)
* Do a signal return; undo the signal stack.
*/
struct sigframe
{
char *pretcode;
int sig;
struct sigcontext sc;
struct _fpstate fpstate;
unsigned long extramask[_NSIG_WORDS-1];
char retcode[8];
};
struct rt_sigframe
{
char *pretcode;
int sig;
struct siginfo *pinfo;
void *puc;
struct siginfo info;
struct ucontext uc;
struct _fpstate fpstate;
char retcode[8];
};
static int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax)
{
......
......@@ -7,6 +7,7 @@
*/
#include <asm/unistd.h>
#include <asm/asm_offsets.h>
/* XXX
......@@ -18,21 +19,124 @@
.globl __kernel_sigreturn
.type __kernel_sigreturn,@function
__kernel_sigreturn:
.LSTART_kernel_sigreturn:
.LSTART_sigreturn:
popl %eax /* XXX does this mean it needs unwind info? */
movl $__NR_sigreturn, %eax
int $0x80
.LEND_sigreturn:
.size __kernel_sigreturn,.-.LSTART_sigreturn
.text
.balign 32
.globl __kernel_rt_sigreturn
.type __kernel_rt_sigreturn,@function
__kernel_rt_sigreturn:
.LSTART_kernel_rt_sigreturn:
.LSTART_rt_sigreturn:
movl $__NR_rt_sigreturn, %eax
int $0x80
.LEND_rt_sigreturn:
.size __kernel_rt_sigreturn,.-.LSTART_rt_sigreturn
.previous
.section .eh_frame,"a",@progbits
.LSTARTFRAMEDLSI1:
.long .LENDCIEDLSI1-.LSTARTCIEDLSI1
.LSTARTCIEDLSI1:
.long 0 /* CIE ID */
.byte 1 /* Version number */
.string "zR" /* NUL-terminated augmentation string */
.uleb128 1 /* Code alignment factor */
.sleb128 -4 /* Data alignment factor */
.byte 8 /* Return address register column */
.uleb128 1 /* Augmentation value length */
.byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
.byte 0 /* DW_CFA_nop */
.align 4
.LENDCIEDLSI1:
.long .LENDFDEDLSI1-.LSTARTFDEDLSI1 /* Length FDE */
.LSTARTFDEDLSI1:
.long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */
/* HACK: The dwarf2 unwind routines will subtract 1 from the
return address to get an address in the middle of the
presumed call instruction. Since we didn't get here via
a call, we need to include the nop before the real start
to make up for it. */
.long .LSTART_sigreturn-1-. /* PC-relative start address */
.long .LEND_sigreturn-.LSTART_sigreturn+1
.uleb128 0 /* Augmentation */
/* What follows are the instructions for the table generation.
We record the locations of each register saved. This is
complicated by the fact that the "CFA" is always assumed to
be the value of the stack pointer in the caller. This means
that we must define the CFA of this body of code to be the
saved value of the stack pointer in the sigcontext. Which
also means that there is no fixed relation to the other
saved registers, which means that we must use DW_CFA_expression
to compute their addresses. It also means that when we
adjust the stack with the popl, we have to do it all over again. */
#define do_cfa_expr(offset) \
.byte 0x0f; /* DW_CFA_def_cfa_expression */ \
.uleb128 1f-0f; /* length */ \
0: .byte 0x74; /* DW_OP_breg4 */ \
.sleb128 offset; /* offset */ \
.byte 0x06; /* DW_OP_deref */ \
1:
#define do_expr(regno, offset) \
.byte 0x10; /* DW_CFA_expression */ \
.uleb128 regno; /* regno */ \
.uleb128 1f-0f; /* length */ \
0: .byte 0x74; /* DW_OP_breg4 */ \
.sleb128 offset; /* offset */ \
1:
do_cfa_expr(SIGCONTEXT_esp+4)
do_expr(0, SIGCONTEXT_eax+4)
do_expr(1, SIGCONTEXT_ecx+4)
do_expr(2, SIGCONTEXT_edx+4)
do_expr(3, SIGCONTEXT_ebx+4)
do_expr(5, SIGCONTEXT_ebp+4)
do_expr(6, SIGCONTEXT_esi+4)
do_expr(7, SIGCONTEXT_edi+4)
do_expr(8, SIGCONTEXT_eip+4)
.byte 0x42 /* DW_CFA_advance_loc 2 -- nop; popl eax. */
do_cfa_expr(SIGCONTEXT_esp)
do_expr(0, SIGCONTEXT_eax)
do_expr(1, SIGCONTEXT_ecx)
do_expr(2, SIGCONTEXT_edx)
do_expr(3, SIGCONTEXT_ebx)
do_expr(5, SIGCONTEXT_ebp)
do_expr(6, SIGCONTEXT_esi)
do_expr(7, SIGCONTEXT_edi)
do_expr(8, SIGCONTEXT_eip)
.align 4
.LENDFDEDLSI1:
.long .LENDFDEDLSI2-.LSTARTFDEDLSI2 /* Length FDE */
.LSTARTFDEDLSI2:
.long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1 /* CIE pointer */
/* HACK: See above wrt unwind library assumptions. */
.long .LSTART_rt_sigreturn-1-. /* PC-relative start address */
.long .LEND_rt_sigreturn-.LSTART_rt_sigreturn+1
.uleb128 0 /* Augmentation */
/* What follows are the instructions for the table generation.
We record the locations of each register saved. This is
slightly less complicated than the above, since we don't
modify the stack pointer in the process. */
do_cfa_expr(RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_esp)
do_expr(0, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_eax)
do_expr(1, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_ecx)
do_expr(2, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_edx)
do_expr(3, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_ebx)
do_expr(5, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_ebp)
do_expr(6, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_esi)
do_expr(7, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_edi)
do_expr(8, RT_SIGFRAME_sigcontext-4 + SIGCONTEXT_eip)
.align 4
.LENDFDEDLSI2:
.previous
......@@ -74,11 +74,13 @@ SYSENTER_RETURN:
.long .Lenter_kernel-.Lpush_edx
.byte 0x0e /* DW_CFA_def_cfa_offset */
.byte 0x10 /* RA at offset 16 now */
.byte 0x85, 0x04 /* DW_CFA_offset %ebp -16 */
/* Finally the epilogue. */
.byte 0x04 /* DW_CFA_advance_loc4 */
.long .Lpop_ebp-.Lenter_kernel
.byte 0x0e /* DW_CFA_def_cfa_offset */
.byte 0x12 /* RA at offset 12 now */
.byte 0xc5 /* DW_CFA_restore %ebp */
.byte 0x04 /* DW_CFA_advance_loc4 */
.long .Lpop_edx-.Lpop_ebp
.byte 0x0e /* DW_CFA_def_cfa_offset */
......
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