Skip to content

L
linux
Commit ab6e570b authored by Paul Mundt's avatar Paul Mundt
Browse files
Options

sh: Generic kgdb stub support. 

This migrates from the old bitrotted kgdb stub implementation and moves
to the generic stub. In the process support for SH-2/SH-2A is also added,
which the old stub never provided.
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d7b01f78
Show whitespace changes
Inline Side-by-side
Showing with 328 additions and 1244 deletions
arch/sh/Kconfig
View file @ ab6e570b
...@@ -27,6 +27,7 @@ config SUPERH32 ...@@ -27,6 +27,7 @@ config SUPERH32
select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_TRACER
select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE
select HAVE_ARCH_KGDB
config SUPERH64 config SUPERH64
def_bool y if CPU_SH5 def_bool y if CPU_SH5
......
arch/sh/Kconfig.debug
View file @ ab6e570b
...@@ -98,19 +98,6 @@ config IRQSTACKS ...@@ -98,19 +98,6 @@ config IRQSTACKS
for handling hard and soft interrupts. This can help avoid for handling hard and soft interrupts. This can help avoid
overflowing the process kernel stacks. overflowing the process kernel stacks.
config SH_KGDB
bool "Include KGDB kernel debugger"
select FRAME_POINTER
select DEBUG_INFO
depends on CPU_SH3 || CPU_SH4
help
Include in-kernel hooks for kgdb, the Linux kernel source level
debugger. See <http://kgdb.sourceforge.net/> for more information.
Unless you are intending to debug the kernel, say N here.
menu "KGDB configuration options"
depends on SH_KGDB
config MORE_COMPILE_OPTIONS config MORE_COMPILE_OPTIONS
bool "Add any additional compile options" bool "Add any additional compile options"
help help
...@@ -122,62 +109,6 @@ config COMPILE_OPTIONS ...@@ -122,62 +109,6 @@ config COMPILE_OPTIONS
string "Additional compile arguments" string "Additional compile arguments"
depends on MORE_COMPILE_OPTIONS depends on MORE_COMPILE_OPTIONS
config KGDB_NMI
def_bool n
prompt "Enter KGDB on NMI"
config SH_KGDB_CONSOLE
def_bool n
prompt "Console messages through GDB"
depends on !SERIAL_SH_SCI_CONSOLE && SERIAL_SH_SCI=y
select SERIAL_CORE_CONSOLE
config KGDB_SYSRQ
def_bool y
prompt "Allow SysRq 'G' to enter KGDB"
depends on MAGIC_SYSRQ
comment "Serial port setup"
config KGDB_DEFPORT
int "Port number (ttySCn)"
default "1"
config KGDB_DEFBAUD
int "Baud rate"
default "115200"
choice
prompt "Parity"
depends on SH_KGDB
default KGDB_DEFPARITY_N
config KGDB_DEFPARITY_N
bool "None"
config KGDB_DEFPARITY_E
bool "Even"
config KGDB_DEFPARITY_O
bool "Odd"
endchoice
choice
prompt "Data bits"
depends on SH_KGDB
default KGDB_DEFBITS_8
config KGDB_DEFBITS_8
bool "8"
config KGDB_DEFBITS_7
bool "7"
endchoice
endmenu
if SUPERH64 if SUPERH64
config SH64_SR_WATCH config SH64_SR_WATCH
......
arch/sh/include/asm/kgdb.h
View file @ ab6e570b
/* #ifndef __ASM_SH_KGDB_H
* May be copied or modified under the terms of the GNU General Public #define __ASM_SH_KGDB_H
* License. See linux/COPYING for more information.
*
* Based on original code by Glenn Engel, Jim Kingdon,
* David Grothe <dave@gcom.com>, Tigran Aivazian, <tigran@sco.com> and
* Amit S. Kale <akale@veritas.com>
*
* Super-H port based on sh-stub.c (Ben Lee and Steve Chamberlain) by
* Henry Bell <henry.bell@st.com>
*
* Header file for low-level support for remote debug using GDB.
*
*/
#ifndef __KGDB_H
#define __KGDB_H
#include <asm/cacheflush.h>
#include <asm/ptrace.h> #include <asm/ptrace.h>
/* Same as pt_regs but has vbr in place of syscall_nr */ /* Same as pt_regs but has vbr in place of syscall_nr */
...@@ -30,40 +16,26 @@ struct kgdb_regs { ...@@ -30,40 +16,26 @@ struct kgdb_regs {
unsigned long vbr; unsigned long vbr;
}; };
/* State info */ enum regnames {
extern char kgdb_in_gdb_mode; GDB_R0, GDB_R1, GDB_R2, GDB_R3, GDB_R4, GDB_R5, GDB_R6, GDB_R7,
extern int kgdb_nofault; /* Ignore bus errors (in gdb mem access) */ GDB_R8, GDB_R9, GDB_R10, GDB_R11, GDB_R12, GDB_R13, GDB_R14, GDB_R15,
extern char in_nmi; /* Debounce flag to prevent NMI reentry*/
/* SCI */ GDB_PC, GDB_PR, GDB_SR, GDB_GBR, GDB_MACH, GDB_MACL, GDB_VBR,
extern int kgdb_portnum; };
extern int kgdb_baud;
extern char kgdb_parity;
extern char kgdb_bits;
/* Init and interface stuff */ #define NUMREGBYTES ((GDB_VBR + 1) * 4)
extern int kgdb_init(void);
extern int (*kgdb_getchar)(void);
extern void (*kgdb_putchar)(int);
/* Trap functions */ static inline void arch_kgdb_breakpoint(void)
typedef void (kgdb_debug_hook_t)(struct pt_regs *regs); {
typedef void (kgdb_bus_error_hook_t)(void); __asm__ __volatile__ ("trapa #0x3c\n");
extern kgdb_debug_hook_t *kgdb_debug_hook; }
extern kgdb_bus_error_hook_t *kgdb_bus_err_hook;
/* Console */ /* State info */
struct console; extern char in_nmi; /* Debounce flag to prevent NMI reentry*/
void kgdb_console_write(struct console *co, const char *s, unsigned count);
extern int kgdb_console_setup(struct console *, char *);
/* Prototypes for jmp fns */ #define BUFMAX 2048
#define _JBLEN 9
typedef int jmp_buf[_JBLEN];
extern void longjmp(jmp_buf __jmpb, int __retval);
extern int setjmp(jmp_buf __jmpb);
/* Forced breakpoint */ #define CACHE_FLUSH_IS_SAFE 1
#define breakpoint() __asm__ __volatile__("trapa #0x3c") #define BREAK_INSTR_SIZE 2
#endif #endif /* __ASM_SH_KGDB_H */
arch/sh/include/asm/system.h
View file @ ab6e570b
...@@ -175,6 +175,8 @@ asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs) ...@@ -175,6 +175,8 @@ asmlinkage void name##_trap_handler(unsigned int vec, struct pt_regs *regs)
BUILD_TRAP_HANDLER(address_error); BUILD_TRAP_HANDLER(address_error);
BUILD_TRAP_HANDLER(debug); BUILD_TRAP_HANDLER(debug);
BUILD_TRAP_HANDLER(bug); BUILD_TRAP_HANDLER(bug);
BUILD_TRAP_HANDLER(breakpoint);
BUILD_TRAP_HANDLER(singlestep);
BUILD_TRAP_HANDLER(fpu_error); BUILD_TRAP_HANDLER(fpu_error);
BUILD_TRAP_HANDLER(fpu_state_restore); BUILD_TRAP_HANDLER(fpu_state_restore);
......
arch/sh/kernel/Makefile_32
View file @ ab6e570b
...@@ -19,7 +19,7 @@ obj-$(CONFIG_VSYSCALL) += vsyscall/ ...@@ -19,7 +19,7 @@ obj-$(CONFIG_VSYSCALL) += vsyscall/
obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_CF_ENABLER) += cf-enabler.o obj-$(CONFIG_CF_ENABLER) += cf-enabler.o
obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o obj-$(CONFIG_SH_STANDARD_BIOS) += sh_bios.o
obj-$(CONFIG_SH_KGDB) += kgdb_stub.o kgdb_jmp.o obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o obj-$(CONFIG_SH_CPU_FREQ) += cpufreq.o
obj-$(CONFIG_MODULES) += sh_ksyms_32.o module.o obj-$(CONFIG_MODULES) += sh_ksyms_32.o module.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
......
arch/sh/kernel/cpu/sh3/entry.S
View file @ ab6e570b
...@@ -52,7 +52,7 @@ ...@@ -52,7 +52,7 @@
* syscall # * syscall #
* *
*/ */
#if defined(CONFIG_KGDB_NMI) #if defined(CONFIG_KGDB)
NMI_VEC = 0x1c0 ! Must catch early for debounce NMI_VEC = 0x1c0 ! Must catch early for debounce
#endif #endif
...@@ -307,7 +307,7 @@ skip_restore: ...@@ -307,7 +307,7 @@ skip_restore:
6: or k0, k2 ! Set the IMASK-bits 6: or k0, k2 ! Set the IMASK-bits
ldc k2, ssr ldc k2, ssr
! !
#if defined(CONFIG_KGDB_NMI) #if defined(CONFIG_KGDB)
! Clear in_nmi ! Clear in_nmi
mov.l 6f, k0 mov.l 6f, k0
mov #0, k1 mov #0, k1
...@@ -320,7 +320,7 @@ skip_restore: ...@@ -320,7 +320,7 @@ skip_restore:
.align 2 .align 2
5: .long 0x00001000 ! DSP 5: .long 0x00001000 ! DSP
#ifdef CONFIG_KGDB_NMI #ifdef CONFIG_KGDB
6: .long in_nmi 6: .long in_nmi
#endif #endif
7: .long 0x30000000 7: .long 0x30000000
...@@ -377,7 +377,7 @@ tlb_miss: ...@@ -377,7 +377,7 @@ tlb_miss:
.balign 512,0,512 .balign 512,0,512
interrupt: interrupt:
mov.l 3f, k3 mov.l 3f, k3
#if defined(CONFIG_KGDB_NMI) #if defined(CONFIG_KGDB)
mov.l 2f, k2 mov.l 2f, k2
! Debounce (filter nested NMI) ! Debounce (filter nested NMI)
mov.l @k2, k0 mov.l @k2, k0
...@@ -394,7 +394,7 @@ interrupt: ...@@ -394,7 +394,7 @@ interrupt:
5: .long NMI_VEC 5: .long NMI_VEC
6: .long in_nmi 6: .long in_nmi
0: 0:
#endif /* defined(CONFIG_KGDB_NMI) */ #endif /* defined(CONFIG_KGDB) */
bra handle_exception bra handle_exception
mov #-1, k2 ! interrupt exception marker mov #-1, k2 ! interrupt exception marker
......
arch/sh/kernel/cpu/sh3/ex.S
View file @ ab6e570b
...@@ -26,7 +26,7 @@ ...@@ -26,7 +26,7 @@
#define fpu_error_trap_handler exception_error #define fpu_error_trap_handler exception_error
#endif #endif
#if !defined(CONFIG_KGDB_NMI) #if !defined(CONFIG_KGDB)
#define kgdb_handle_exception exception_error #define kgdb_handle_exception exception_error
#endif #endif
......
arch/sh/kernel/debugtraps.S
View file @ ab6e570b
...@@ -3,7 +3,7 @@ ...@@ -3,7 +3,7 @@
* *
* Debug trap jump tables for SuperH * Debug trap jump tables for SuperH
* *
* Copyright (C) 2006 Paul Mundt * Copyright (C) 2006 - 2008 Paul Mundt
* *
* This file is subject to the terms and conditions of the GNU General Public * This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive * License. See the file "COPYING" in the main directory of this archive
...@@ -12,8 +12,9 @@ ...@@ -12,8 +12,9 @@
#include <linux/sys.h> #include <linux/sys.h>
#include <linux/linkage.h> #include <linux/linkage.h>
#if !defined(CONFIG_SH_KGDB) #if !defined(CONFIG_KGDB)
#define kgdb_handle_exception debug_trap_handler #define breakpoint_trap_handler debug_trap_handler
#define singlestep_trap_handler debug_trap_handler
#endif #endif
#if !defined(CONFIG_SH_STANDARD_BIOS) #if !defined(CONFIG_SH_STANDARD_BIOS)
...@@ -35,7 +36,7 @@ ENTRY(debug_trap_table) ...@@ -35,7 +36,7 @@ ENTRY(debug_trap_table)
.long debug_trap_handler /* 0x39 */ .long debug_trap_handler /* 0x39 */
.long debug_trap_handler /* 0x3a */ .long debug_trap_handler /* 0x3a */
.long debug_trap_handler /* 0x3b */ .long debug_trap_handler /* 0x3b */
.long kgdb_handle_exception /* 0x3c */ .long breakpoint_trap_handler /* 0x3c */
.long debug_trap_handler /* 0x3d */ .long singlestep_trap_handler /* 0x3d */
.long bug_trap_handler /* 0x3e */ .long bug_trap_handler /* 0x3e */
.long sh_bios_handler /* 0x3f */ .long sh_bios_handler /* 0x3f */
arch/sh/kernel/entry-common.S
View file @ ab6e570b
...@@ -308,15 +308,19 @@ ENTRY(system_call) ...@@ -308,15 +308,19 @@ ENTRY(system_call)
mov.l 1f, r9 mov.l 1f, r9
mov.l @r9, r8 ! Read from TRA (Trap Address) Register mov.l @r9, r8 ! Read from TRA (Trap Address) Register
#endif #endif
mov #OFF_TRA, r10
add r15, r10
mov.l r8, @r10 ! set TRA value to tra
/* /*
* Check the trap type * Check the trap type
*/ */
mov #((0x20 << 2) - 1), r9 mov #((0x20 << 2) - 1), r9
cmp/hi r9, r8 cmp/hi r9, r8
bt/s debug_trap ! it's a debug trap.. bt/s debug_trap ! it's a debug trap..
mov #OFF_TRA, r9 nop
add r15, r9
mov.l r8, @r9 ! set TRA value to tra
#ifdef CONFIG_TRACE_IRQFLAGS #ifdef CONFIG_TRACE_IRQFLAGS
mov.l 5f, r10 mov.l 5f, r10
jsr @r10 jsr @r10
......
arch/sh/kernel/kgdb.c 0 → 100644
View file @ ab6e570b
/*
* SuperH KGDB support
*
* Copyright (C) 2008 Paul Mundt
*
* Single stepping taken from the old stub by Henry Bell and Jeremy Siegel.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/cacheflush.h>
char in_nmi = 0; /* Set during NMI to prevent re-entry */
/* Macros for single step instruction identification */
#define OPCODE_BT(op) (((op) & 0xff00) == 0x8900)
#define OPCODE_BF(op) (((op) & 0xff00) == 0x8b00)
#define OPCODE_BTF_DISP(op) (((op) & 0x80) ? (((op) | 0xffffff80) << 1) : \
(((op) & 0x7f ) << 1))
#define OPCODE_BFS(op) (((op) & 0xff00) == 0x8f00)
#define OPCODE_BTS(op) (((op) & 0xff00) == 0x8d00)
#define OPCODE_BRA(op) (((op) & 0xf000) == 0xa000)
#define OPCODE_BRA_DISP(op) (((op) & 0x800) ? (((op) | 0xfffff800) << 1) : \
(((op) & 0x7ff) << 1))
#define OPCODE_BRAF(op) (((op) & 0xf0ff) == 0x0023)
#define OPCODE_BRAF_REG(op) (((op) & 0x0f00) >> 8)
#define OPCODE_BSR(op) (((op) & 0xf000) == 0xb000)
#define OPCODE_BSR_DISP(op) (((op) & 0x800) ? (((op) | 0xfffff800) << 1) : \
(((op) & 0x7ff) << 1))
#define OPCODE_BSRF(op) (((op) & 0xf0ff) == 0x0003)
#define OPCODE_BSRF_REG(op) (((op) >> 8) & 0xf)
#define OPCODE_JMP(op) (((op) & 0xf0ff) == 0x402b)
#define OPCODE_JMP_REG(op) (((op) >> 8) & 0xf)
#define OPCODE_JSR(op) (((op) & 0xf0ff) == 0x400b)
#define OPCODE_JSR_REG(op) (((op) >> 8) & 0xf)
#define OPCODE_RTS(op) ((op) == 0xb)
#define OPCODE_RTE(op) ((op) == 0x2b)
#define SR_T_BIT_MASK 0x1
#define STEP_OPCODE 0xc33d
/* Calculate the new address for after a step */
static short *get_step_address(struct pt_regs *linux_regs)
{
opcode_t op = __raw_readw(linux_regs->pc);
long addr;
/* BT */
if (OPCODE_BT(op)) {
if (linux_regs->sr & SR_T_BIT_MASK)
addr = linux_regs->pc + 4 + OPCODE_BTF_DISP(op);
else
addr = linux_regs->pc + 2;
}
/* BTS */
else if (OPCODE_BTS(op)) {
if (linux_regs->sr & SR_T_BIT_MASK)
addr = linux_regs->pc + 4 + OPCODE_BTF_DISP(op);
else
addr = linux_regs->pc + 4; /* Not in delay slot */
}
/* BF */
else if (OPCODE_BF(op)) {
if (!(linux_regs->sr & SR_T_BIT_MASK))
addr = linux_regs->pc + 4 + OPCODE_BTF_DISP(op);
else
addr = linux_regs->pc + 2;
}
/* BFS */
else if (OPCODE_BFS(op)) {
if (!(linux_regs->sr & SR_T_BIT_MASK))
addr = linux_regs->pc + 4 + OPCODE_BTF_DISP(op);
else
addr = linux_regs->pc + 4; /* Not in delay slot */
}
/* BRA */
else if (OPCODE_BRA(op))
addr = linux_regs->pc + 4 + OPCODE_BRA_DISP(op);
/* BRAF */
else if (OPCODE_BRAF(op))
addr = linux_regs->pc + 4
+ linux_regs->regs[OPCODE_BRAF_REG(op)];
/* BSR */
else if (OPCODE_BSR(op))
addr = linux_regs->pc + 4 + OPCODE_BSR_DISP(op);
/* BSRF */
else if (OPCODE_BSRF(op))
addr = linux_regs->pc + 4
+ linux_regs->regs[OPCODE_BSRF_REG(op)];
/* JMP */
else if (OPCODE_JMP(op))
addr = linux_regs->regs[OPCODE_JMP_REG(op)];
/* JSR */
else if (OPCODE_JSR(op))
addr = linux_regs->regs[OPCODE_JSR_REG(op)];
/* RTS */
else if (OPCODE_RTS(op))
addr = linux_regs->pr;
/* RTE */
else if (OPCODE_RTE(op))
addr = linux_regs->regs[15];
/* Other */
else
addr = linux_regs->pc + instruction_size(op);
flush_icache_range(addr, addr + instruction_size(op));
return (short *)addr;
}
/*
* Replace the instruction immediately after the current instruction
* (i.e. next in the expected flow of control) with a trap instruction,
* so that returning will cause only a single instruction to be executed.
* Note that this model is slightly broken for instructions with delay
* slots (e.g. B[TF]S, BSR, BRA etc), where both the branch and the
* instruction in the delay slot will be executed.
*/
static unsigned long stepped_address;
static opcode_t stepped_opcode;
static void do_single_step(struct pt_regs *linux_regs)
{
/* Determine where the target instruction will send us to */
unsigned short *addr = get_step_address(linux_regs);
stepped_address = (int)addr;
/* Replace it */
stepped_opcode = __raw_readw((long)addr);
*addr = STEP_OPCODE;
/* Flush and return */
flush_icache_range((long)addr, (long)addr +
instruction_size(stepped_opcode));
}
/* Undo a single step */
static void undo_single_step(struct pt_regs *linux_regs)
{
/* If we have stepped, put back the old instruction */
/* Use stepped_address in case we stopped elsewhere */
if (stepped_opcode != 0) {
__raw_writew(stepped_opcode, stepped_address);
flush_icache_range(stepped_address, stepped_address + 2);
}
stepped_opcode = 0;
}
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
int i;
for (i = 0; i < 16; i++)
gdb_regs[GDB_R0 + i] = regs->regs[i];
gdb_regs[GDB_PC] = regs->pc;
gdb_regs[GDB_PR] = regs->pr;
gdb_regs[GDB_SR] = regs->sr;
gdb_regs[GDB_GBR] = regs->gbr;
gdb_regs[GDB_MACH] = regs->mach;
gdb_regs[GDB_MACL] = regs->macl;
__asm__ __volatile__ ("stc vbr, %0" : "=r" (gdb_regs[GDB_VBR]));
}
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
int i;
for (i = 0; i < 16; i++)
regs->regs[GDB_R0 + i] = gdb_regs[GDB_R0 + i];
regs->pc = gdb_regs[GDB_PC];
regs->pr = gdb_regs[GDB_PR];
regs->sr = gdb_regs[GDB_SR];
regs->gbr = gdb_regs[GDB_GBR];
regs->mach = gdb_regs[GDB_MACH];
regs->macl = gdb_regs[GDB_MACL];
__asm__ __volatile__ ("ldc %0, vbr" : : "r" (gdb_regs[GDB_VBR]));
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
gdb_regs[GDB_R15] = p->thread.sp;
gdb_regs[GDB_PC] = p->thread.pc;
}
int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
char *remcomInBuffer, char *remcomOutBuffer,
struct pt_regs *linux_regs)
{
unsigned long addr;
char *ptr;
/* Undo any stepping we may have done */
undo_single_step(linux_regs);
switch (remcomInBuffer[0]) {
case 'c':
case 's':
/* try to read optional parameter, pc unchanged if no parm */
ptr = &remcomInBuffer[1];
if (kgdb_hex2long(&ptr, &addr))
linux_regs->pc = addr;
case 'D':
case 'k':
atomic_set(&kgdb_cpu_doing_single_step, -1);
if (remcomInBuffer[0] == 's') {
do_single_step(linux_regs);
kgdb_single_step = 1;
atomic_set(&kgdb_cpu_doing_single_step,
raw_smp_processor_id());
}
return 0;
}
/* this means that we do not want to exit from the handler: */
return -1;
}
/*
* The primary entry points for the kgdb debug trap table entries.
*/
BUILD_TRAP_HANDLER(singlestep)
{
unsigned long flags;
TRAP_HANDLER_DECL;
local_irq_save(flags);
regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
kgdb_handle_exception(vec >> 2, SIGTRAP, 0, regs);
local_irq_restore(flags);
}
BUILD_TRAP_HANDLER(breakpoint)
{
unsigned long flags;
TRAP_HANDLER_DECL;
local_irq_save(flags);
kgdb_handle_exception(vec >> 2, SIGTRAP, 0, regs);
local_irq_restore(flags);
}
int kgdb_arch_init(void)
{
return 0;
}
void kgdb_arch_exit(void)
{
}
struct kgdb_arch arch_kgdb_ops = {
/* Breakpoint instruction: trapa #0x3c */
#ifdef CONFIG_CPU_LITTLE_ENDIAN
.gdb_bpt_instr = { 0x3c, 0xc3 },
#else
.gdb_bpt_instr = { 0xc3, 0x3c },
#endif
};
arch/sh/kernel/kgdb_jmp.S deleted 100644 → 0
View file @ d7b01f78
#include <linux/linkage.h>
ENTRY(setjmp)
add #(9*4), r4
sts.l pr, @-r4
mov.l r15, @-r4
mov.l r14, @-r4
mov.l r13, @-r4
mov.l r12, @-r4
mov.l r11, @-r4
mov.l r10, @-r4
mov.l r9, @-r4
mov.l r8, @-r4
rts
mov #0, r0
ENTRY(longjmp)
mov.l @r4+, r8
mov.l @r4+, r9
mov.l @r4+, r10
mov.l @r4+, r11
mov.l @r4+, r12
mov.l @r4+, r13
mov.l @r4+, r14
mov.l @r4+, r15
lds.l @r4+, pr
mov r5, r0
tst r0, r0
bf 1f
mov #1, r0 ! in case val==0
1: rts
nop
arch/sh/kernel/kgdb_stub.c deleted 100644 → 0
View file @ d7b01f78
/*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* Contains extracts from code by Glenn Engel, Jim Kingdon,
* David Grothe <dave@gcom.com>, Tigran Aivazian <tigran@sco.com>,
* Amit S. Kale <akale@veritas.com>, William Gatliff <bgat@open-widgets.com>,
* Ben Lee, Steve Chamberlain and Benoit Miller <fulg@iname.com>.
*
* This version by Henry Bell <henry.bell@st.com>
* Minor modifications by Jeremy Siegel <jsiegel@mvista.com>
*
* Contains low-level support for remote debug using GDB.
*
* To enable debugger support, two things need to happen. A call to
* set_debug_traps() is necessary in order to allow any breakpoints
* or error conditions to be properly intercepted and reported to gdb.
* A breakpoint also needs to be generated to begin communication. This
* is most easily accomplished by a call to breakpoint() which does
* a trapa if the initialisation phase has been successfully completed.
*
* In this case, set_debug_traps() is not used to "take over" exceptions;
* other kernel code is modified instead to enter the kgdb functions here
* when appropriate (see entry.S for breakpoint traps and NMI interrupts,
* see traps.c for kernel error exceptions).
*
* The following gdb commands are supported:
*
* Command Function Return value
*
* g return the value of the CPU registers hex data or ENN
* G set the value of the CPU registers OK or ENN
*
* mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
* MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
* XAA..AA,LLLL: Same, but data is binary (not hex) OK or ENN
*
* c Resume at current address SNN ( signal NN)
* cAA..AA Continue at address AA..AA SNN
* CNN; Resume at current address with signal SNN
* CNN;AA..AA Resume at address AA..AA with signal SNN
*
* s Step one instruction SNN
* sAA..AA Step one instruction from AA..AA SNN
* SNN; Step one instruction with signal SNN
* SNNAA..AA Step one instruction from AA..AA w/NN SNN
*
* k kill (Detach GDB)
*
* d Toggle debug flag
* D Detach GDB
*
* Hct Set thread t for operations, OK or ENN
* c = 'c' (step, cont), c = 'g' (other
* operations)
*
* qC Query current thread ID QCpid
* qfThreadInfo Get list of current threads (first) m<id>
* qsThreadInfo " " " " " (subsequent)
* qOffsets Get section offsets Text=x;Data=y;Bss=z
*
* TXX Find if thread XX is alive OK or ENN
* ? What was the last sigval ? SNN (signal NN)
* O Output to GDB console
*
* Remote communication protocol.
*
* A debug packet whose contents are <data> is encapsulated for
* transmission in the form:
*
* $ <data> # CSUM1 CSUM2
*
* <data> must be ASCII alphanumeric and cannot include characters
* '$' or '#'. If <data> starts with two characters followed by
* ':', then the existing stubs interpret this as a sequence number.
*
* CSUM1 and CSUM2 are ascii hex representation of an 8-bit
* checksum of <data>, the most significant nibble is sent first.
* the hex digits 0-9,a-f are used.
*
* Receiver responds with:
*
* + - if CSUM is correct and ready for next packet
* - - if CSUM is incorrect
*
* Responses can be run-length encoded to save space. A '*' means that
* the next character is an ASCII encoding giving a repeat count which
* stands for that many repetitions of the character preceding the '*'.
* The encoding is n+29, yielding a printable character where n >=3
* (which is where RLE starts to win). Don't use an n > 126.
*
* So "0* " means the same as "0000".
*/
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/module.h>
#include <asm/system.h>
#include <asm/cacheflush.h>
#include <asm/current.h>
#include <asm/signal.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>
#include <asm/kgdb.h>
#include <asm/io.h>
/* Function pointers for linkage */
kgdb_debug_hook_t *kgdb_debug_hook;
kgdb_bus_error_hook_t *kgdb_bus_err_hook;
int (*kgdb_getchar)(void);
EXPORT_SYMBOL_GPL(kgdb_getchar);
void (*kgdb_putchar)(int);
EXPORT_SYMBOL_GPL(kgdb_putchar);
static void put_debug_char(int c)
{
if (!kgdb_putchar)
return;
(*kgdb_putchar)(c);
}
static int get_debug_char(void)
{
if (!kgdb_getchar)
return -1;
return (*kgdb_getchar)();
}
/* Num chars in in/out bound buffers, register packets need NUMREGBYTES * 2 */
#define BUFMAX 1024
#define NUMREGBYTES (MAXREG*4)
#define OUTBUFMAX (NUMREGBYTES*2+512)
enum {
R0 = 0, R1, R2, R3, R4, R5, R6, R7,
R8, R9, R10, R11, R12, R13, R14, R15,
PC, PR, GBR, VBR, MACH, MACL, SR,
/* */
MAXREG
};
static unsigned int registers[MAXREG];
struct kgdb_regs trap_registers;
char kgdb_in_gdb_mode;
char in_nmi; /* Set during NMI to prevent reentry */
int kgdb_nofault; /* Boolean to ignore bus errs (i.e. in GDB) */
/* Default values for SCI (can override via kernel args in setup.c) */
#ifndef CONFIG_KGDB_DEFPORT
#define CONFIG_KGDB_DEFPORT 1
#endif
#ifndef CONFIG_KGDB_DEFBAUD
#define CONFIG_KGDB_DEFBAUD 115200
#endif
#if defined(CONFIG_KGDB_DEFPARITY_E)
#define CONFIG_KGDB_DEFPARITY 'E'
#elif defined(CONFIG_KGDB_DEFPARITY_O)
#define CONFIG_KGDB_DEFPARITY 'O'
#else /* CONFIG_KGDB_DEFPARITY_N */
#define CONFIG_KGDB_DEFPARITY 'N'
#endif
#ifdef CONFIG_KGDB_DEFBITS_7
#define CONFIG_KGDB_DEFBITS '7'
#else /* CONFIG_KGDB_DEFBITS_8 */
#define CONFIG_KGDB_DEFBITS '8'
#endif
/* SCI/UART settings, used in kgdb_console_setup() */
int kgdb_portnum = CONFIG_KGDB_DEFPORT;
EXPORT_SYMBOL_GPL(kgdb_portnum);
int kgdb_baud = CONFIG_KGDB_DEFBAUD;
EXPORT_SYMBOL_GPL(kgdb_baud);
char kgdb_parity = CONFIG_KGDB_DEFPARITY;
EXPORT_SYMBOL_GPL(kgdb_parity);
char kgdb_bits = CONFIG_KGDB_DEFBITS;
EXPORT_SYMBOL_GPL(kgdb_bits);
/* Jump buffer for setjmp/longjmp */
static jmp_buf rem_com_env;
/* TRA differs sh3/4 */
#if defined(CONFIG_CPU_SH3)
#define TRA 0xffffffd0
#elif defined(CONFIG_CPU_SH4)
#define TRA 0xff000020
#endif
/* Macros for single step instruction identification */
#define OPCODE_BT(op) (((op) & 0xff00) == 0x8900)
#define OPCODE_BF(op) (((op) & 0xff00) == 0x8b00)
#define OPCODE_BTF_DISP(op) (((op) & 0x80) ? (((op) | 0xffffff80) << 1) : \
(((op) & 0x7f ) << 1))
#define OPCODE_BFS(op) (((op) & 0xff00) == 0x8f00)
#define OPCODE_BTS(op) (((op) & 0xff00) == 0x8d00)
#define OPCODE_BRA(op) (((op) & 0xf000) == 0xa000)
#define OPCODE_BRA_DISP(op) (((op) & 0x800) ? (((op) | 0xfffff800) << 1) : \
(((op) & 0x7ff) << 1))
#define OPCODE_BRAF(op) (((op) & 0xf0ff) == 0x0023)
#define OPCODE_BRAF_REG(op) (((op) & 0x0f00) >> 8)
#define OPCODE_BSR(op) (((op) & 0xf000) == 0xb000)
#define OPCODE_BSR_DISP(op) (((op) & 0x800) ? (((op) | 0xfffff800) << 1) : \
(((op) & 0x7ff) << 1))
#define OPCODE_BSRF(op) (((op) & 0xf0ff) == 0x0003)
#define OPCODE_BSRF_REG(op) (((op) >> 8) & 0xf)
#define OPCODE_JMP(op) (((op) & 0xf0ff) == 0x402b)
#define OPCODE_JMP_REG(op) (((op) >> 8) & 0xf)
#define OPCODE_JSR(op) (((op) & 0xf0ff) == 0x400b)
#define OPCODE_JSR_REG(op) (((op) >> 8) & 0xf)
#define OPCODE_RTS(op) ((op) == 0xb)
#define OPCODE_RTE(op) ((op) == 0x2b)
#define SR_T_BIT_MASK 0x1
#define STEP_OPCODE 0xc320
#define BIOS_CALL_TRAP 0x3f
/* Exception codes as per SH-4 core manual */
#define ADDRESS_ERROR_LOAD_VEC 7
#define ADDRESS_ERROR_STORE_VEC 8
#define TRAP_VEC 11
#define INVALID_INSN_VEC 12
#define INVALID_SLOT_VEC 13
#define NMI_VEC 14
#define USER_BREAK_VEC 15
#define SERIAL_BREAK_VEC 58
/* Misc static */
static int stepped_address;
static short stepped_opcode;
static char in_buffer[BUFMAX];
static char out_buffer[OUTBUFMAX];
static void kgdb_to_gdb(const char *s);
/* Convert ch to hex */
static int hex(const char ch)
{
if ((ch >= 'a') && (ch <= 'f'))
return (ch - 'a' + 10);
if ((ch >= '0') && (ch <= '9'))
return (ch - '0');
if ((ch >= 'A') && (ch <= 'F'))
return (ch - 'A' + 10);
return (-1);
}
/* Convert the memory pointed to by mem into hex, placing result in buf.
Returns a pointer to the last char put in buf (null) */
static char *mem_to_hex(const char *mem, char *buf, const int count)
{
int i;
int ch;
unsigned short s_val;
unsigned long l_val;
/* Check for 16 or 32 */
if (count == 2 && ((long) mem & 1) == 0) {
s_val = *(unsigned short *) mem;
mem = (char *) &s_val;
} else if (count == 4 && ((long) mem & 3) == 0) {
l_val = *(unsigned long *) mem;
mem = (char *) &l_val;
}
for (i = 0; i < count; i++) {
ch = *mem++;
buf = pack_hex_byte(buf, ch);
}
*buf = 0;
return (buf);
}
/* Convert the hex array pointed to by buf into binary, to be placed in mem.
Return a pointer to the character after the last byte written */
static char *hex_to_mem(const char *buf, char *mem, const int count)
{
int i;
unsigned char ch;
for (i = 0; i < count; i++) {
ch = hex(*buf++) << 4;
ch = ch + hex(*buf++);
*mem++ = ch;
}
return (mem);
}
/* While finding valid hex chars, convert to an integer, then return it */
static int hex_to_int(char **ptr, int *int_value)
{
int num_chars = 0;
int hex_value;
*int_value = 0;
while (**ptr) {
hex_value = hex(**ptr);
if (hex_value >= 0) {
*int_value = (*int_value << 4) | hex_value;
num_chars++;
} else
break;
(*ptr)++;
}
return num_chars;
}
/* Copy the binary array pointed to by buf into mem. Fix $, #,
and 0x7d escaped with 0x7d. Return a pointer to the character
after the last byte written. */
static char *ebin_to_mem(const char *buf, char *mem, int count)
{
for (; count > 0; count--, buf++) {
if (*buf == 0x7d)
*mem++ = *(++buf) ^ 0x20;
else
*mem++ = *buf;
}
return mem;
}
/* Scan for the start char '$', read the packet and check the checksum */
static void get_packet(char *buffer, int buflen)
{
unsigned char checksum;
unsigned char xmitcsum;
int i;
int count;
char ch;
do {
/* Ignore everything until the start character */
while ((ch = get_debug_char()) != '$');
checksum = 0;
xmitcsum = -1;
count = 0;
/* Now, read until a # or end of buffer is found */
while (count < (buflen - 1)) {
ch = get_debug_char();
if (ch == '#')
break;
checksum = checksum + ch;
buffer[count] = ch;
count = count + 1;
}
buffer[count] = 0;
/* Continue to read checksum following # */
if (ch == '#') {
xmitcsum = hex(get_debug_char()) << 4;
xmitcsum += hex(get_debug_char());
/* Checksum */
if (checksum != xmitcsum)
put_debug_char('-'); /* Failed checksum */
else {
/* Ack successful transfer */
put_debug_char('+');
/* If a sequence char is present, reply
the sequence ID */
if (buffer[2] == ':') {
put_debug_char(buffer[0]);
put_debug_char(buffer[1]);
/* Remove sequence chars from buffer */
count = strlen(buffer);
for (i = 3; i <= count; i++)
buffer[i - 3] = buffer[i];
}
}
}
}
while (checksum != xmitcsum); /* Keep trying while we fail */
}
/* Send the packet in the buffer with run-length encoding */
static void put_packet(char *buffer)
{
int checksum;
char *src;
int runlen;
int encode;
do {
src = buffer;
put_debug_char('$');
checksum = 0;
/* Continue while we still have chars left */
while (*src) {
/* Check for runs up to 99 chars long */
for (runlen = 1; runlen < 99; runlen++) {
if (src[0] != src[runlen])
break;
}
if (runlen > 3) {
/* Got a useful amount, send encoding */
encode = runlen + ' ' - 4;
put_debug_char(*src); checksum += *src;
put_debug_char('*'); checksum += '*';
put_debug_char(encode); checksum += encode;
src += runlen;
} else {
/* Otherwise just send the current char */
put_debug_char(*src); checksum += *src;
src += 1;
}
}
/* '#' Separator, put high and low components of checksum */
put_debug_char('#');
put_debug_char(hex_asc_hi(checksum));
put_debug_char(hex_asc_lo(checksum));
}
while ((get_debug_char()) != '+'); /* While no ack */
}
/* A bus error has occurred - perform a longjmp to return execution and
allow handling of the error */
static void kgdb_handle_bus_error(void)
{
longjmp(rem_com_env, 1);
}
/* Translate SH-3/4 exception numbers to unix-like signal values */
static int compute_signal(const int excep_code)
{
int sigval;
switch (excep_code) {
case INVALID_INSN_VEC:
case INVALID_SLOT_VEC:
sigval = SIGILL;
break;
case ADDRESS_ERROR_LOAD_VEC:
case ADDRESS_ERROR_STORE_VEC:
sigval = SIGSEGV;
break;
case SERIAL_BREAK_VEC:
case NMI_VEC:
sigval = SIGINT;
break;
case USER_BREAK_VEC:
case TRAP_VEC:
sigval = SIGTRAP;
break;
default:
sigval = SIGBUS; /* "software generated" */
break;
}
return (sigval);
}
/* Make a local copy of the registers passed into the handler (bletch) */
static void kgdb_regs_to_gdb_regs(const struct kgdb_regs *regs,
int *gdb_regs)
{
gdb_regs[R0] = regs->regs[R0];
gdb_regs[R1] = regs->regs[R1];
gdb_regs[R2] = regs->regs[R2];
gdb_regs[R3] = regs->regs[R3];
gdb_regs[R4] = regs->regs[R4];
gdb_regs[R5] = regs->regs[R5];
gdb_regs[R6] = regs->regs[R6];
gdb_regs[R7] = regs->regs[R7];
gdb_regs[R8] = regs->regs[R8];
gdb_regs[R9] = regs->regs[R9];
gdb_regs[R10] = regs->regs[R10];
gdb_regs[R11] = regs->regs[R11];
gdb_regs[R12] = regs->regs[R12];
gdb_regs[R13] = regs->regs[R13];
gdb_regs[R14] = regs->regs[R14];
gdb_regs[R15] = regs->regs[R15];
gdb_regs[PC] = regs->pc;
gdb_regs[PR] = regs->pr;
gdb_regs[GBR] = regs->gbr;
gdb_regs[MACH] = regs->mach;
gdb_regs[MACL] = regs->macl;
gdb_regs[SR] = regs->sr;
gdb_regs[VBR] = regs->vbr;
}
/* Copy local gdb registers back to kgdb regs, for later copy to kernel */
static void gdb_regs_to_kgdb_regs(const int *gdb_regs,
struct kgdb_regs *regs)
{
regs->regs[R0] = gdb_regs[R0];
regs->regs[R1] = gdb_regs[R1];
regs->regs[R2] = gdb_regs[R2];
regs->regs[R3] = gdb_regs[R3];
regs->regs[R4] = gdb_regs[R4];
regs->regs[R5] = gdb_regs[R5];
regs->regs[R6] = gdb_regs[R6];
regs->regs[R7] = gdb_regs[R7];
regs->regs[R8] = gdb_regs[R8];
regs->regs[R9] = gdb_regs[R9];
regs->regs[R10] = gdb_regs[R10];
regs->regs[R11] = gdb_regs[R11];
regs->regs[R12] = gdb_regs[R12];
regs->regs[R13] = gdb_regs[R13];
regs->regs[R14] = gdb_regs[R14];
regs->regs[R15] = gdb_regs[R15];
regs->pc = gdb_regs[PC];
regs->pr = gdb_regs[PR];
regs->gbr = gdb_regs[GBR];
regs->mach = gdb_regs[MACH];
regs->macl = gdb_regs[MACL];
regs->sr = gdb_regs[SR];
regs->vbr = gdb_regs[VBR];
}
/* Calculate the new address for after a step */
static short *get_step_address(void)
{
short op = *(short *) trap_registers.pc;
long addr;
/* BT */
if (OPCODE_BT(op)) {
if (trap_registers.sr & SR_T_BIT_MASK)
addr = trap_registers.pc + 4 + OPCODE_BTF_DISP(op);
else
addr = trap_registers.pc + 2;
}
/* BTS */
else if (OPCODE_BTS(op)) {
if (trap_registers.sr & SR_T_BIT_MASK)
addr = trap_registers.pc + 4 + OPCODE_BTF_DISP(op);
else
addr = trap_registers.pc + 4; /* Not in delay slot */
}
/* BF */
else if (OPCODE_BF(op)) {
if (!(trap_registers.sr & SR_T_BIT_MASK))
addr = trap_registers.pc + 4 + OPCODE_BTF_DISP(op);
else
addr = trap_registers.pc + 2;
}
/* BFS */
else if (OPCODE_BFS(op)) {
if (!(trap_registers.sr & SR_T_BIT_MASK))
addr = trap_registers.pc + 4 + OPCODE_BTF_DISP(op);
else
addr = trap_registers.pc + 4; /* Not in delay slot */
}
/* BRA */
else if (OPCODE_BRA(op))
addr = trap_registers.pc + 4 + OPCODE_BRA_DISP(op);
/* BRAF */
else if (OPCODE_BRAF(op))
addr = trap_registers.pc + 4
+ trap_registers.regs[OPCODE_BRAF_REG(op)];
/* BSR */
else if (OPCODE_BSR(op))
addr = trap_registers.pc + 4 + OPCODE_BSR_DISP(op);
/* BSRF */
else if (OPCODE_BSRF(op))
addr = trap_registers.pc + 4
+ trap_registers.regs[OPCODE_BSRF_REG(op)];
/* JMP */
else if (OPCODE_JMP(op))
addr = trap_registers.regs[OPCODE_JMP_REG(op)];
/* JSR */
else if (OPCODE_JSR(op))
addr = trap_registers.regs[OPCODE_JSR_REG(op)];
/* RTS */
else if (OPCODE_RTS(op))
addr = trap_registers.pr;
/* RTE */
else if (OPCODE_RTE(op))
addr = trap_registers.regs[15];
/* Other */
else
addr = trap_registers.pc + 2;
flush_icache_range(addr, addr + 2);
return (short *) addr;
}
/* Set up a single-step. Replace the instruction immediately after the
current instruction (i.e. next in the expected flow of control) with a
trap instruction, so that returning will cause only a single instruction
to be executed. Note that this model is slightly broken for instructions
with delay slots (e.g. B[TF]S, BSR, BRA etc), where both the branch
and the instruction in the delay slot will be executed. */
static void do_single_step(void)
{
unsigned short *addr = 0;
/* Determine where the target instruction will send us to */
addr = get_step_address();
stepped_address = (int)addr;
/* Replace it */
stepped_opcode = *(short *)addr;
*addr = STEP_OPCODE;
/* Flush and return */
flush_icache_range((long) addr, (long) addr + 2);
}
/* Undo a single step */
static void undo_single_step(void)
{
/* If we have stepped, put back the old instruction */
/* Use stepped_address in case we stopped elsewhere */
if (stepped_opcode != 0) {
*(short*)stepped_address = stepped_opcode;
flush_icache_range(stepped_address, stepped_address + 2);
}
stepped_opcode = 0;
}
/* Send a signal message */
static void send_signal_msg(const int signum)
{
out_buffer[0] = 'S';
out_buffer[1] = hex_asc_hi(signum);
out_buffer[2] = hex_asc_lo(signum);
out_buffer[3] = 0;
put_packet(out_buffer);
}
/* Reply that all was well */
static void send_ok_msg(void)
{
strcpy(out_buffer, "OK");
put_packet(out_buffer);
}
/* Reply that an error occurred */
static void send_err_msg(void)
{
strcpy(out_buffer, "E01");
put_packet(out_buffer);
}
/* Empty message indicates unrecognised command */
static void send_empty_msg(void)
{
put_packet("");
}
/* Read memory due to 'm' message */
static void read_mem_msg(void)
{
char *ptr;
int addr;
int length;
/* Jmp, disable bus error handler */
if (setjmp(rem_com_env) == 0) {
kgdb_nofault = 1;
/* Walk through, have m<addr>,<length> */
ptr = &in_buffer[1];
if (hex_to_int(&ptr, &addr) && (*ptr++ == ','))
if (hex_to_int(&ptr, &length)) {
ptr = 0;
if (length * 2 > OUTBUFMAX)
length = OUTBUFMAX / 2;
mem_to_hex((char *) addr, out_buffer, length);
}
if (ptr)
send_err_msg();
else
put_packet(out_buffer);
} else
send_err_msg();
/* Restore bus error handler */
kgdb_nofault = 0;
}
/* Write memory due to 'M' or 'X' message */
static void write_mem_msg(int binary)
{
char *ptr;
int addr;
int length;
if (setjmp(rem_com_env) == 0) {
kgdb_nofault = 1;
/* Walk through, have M<addr>,<length>:<data> */
ptr = &in_buffer[1];
if (hex_to_int(&ptr, &addr) && (*ptr++ == ','))
if (hex_to_int(&ptr, &length) && (*ptr++ == ':')) {
if (binary)
ebin_to_mem(ptr, (char*)addr, length);
else
hex_to_mem(ptr, (char*)addr, length);
flush_icache_range(addr, addr + length);
ptr = 0;
send_ok_msg();
}
if (ptr)
send_err_msg();
} else
send_err_msg();
/* Restore bus error handler */
kgdb_nofault = 0;
}
/* Continue message */
static void continue_msg(void)
{
/* Try to read optional parameter, PC unchanged if none */
char *ptr = &in_buffer[1];
int addr;
if (hex_to_int(&ptr, &addr))
trap_registers.pc = addr;
}
/* Continue message with signal */
static void continue_with_sig_msg(void)
{
int signal;
char *ptr = &in_buffer[1];
int addr;
/* Report limitation */
kgdb_to_gdb("Cannot force signal in kgdb, continuing anyway.\n");
/* Signal */
hex_to_int(&ptr, &signal);
if (*ptr == ';')
ptr++;
/* Optional address */
if (hex_to_int(&ptr, &addr))
trap_registers.pc = addr;
}
/* Step message */
static void step_msg(void)
{
continue_msg();
do_single_step();
}
/* Step message with signal */
static void step_with_sig_msg(void)
{
continue_with_sig_msg();
do_single_step();
}
/* Send register contents */
static void send_regs_msg(void)
{
kgdb_regs_to_gdb_regs(&trap_registers, registers);
mem_to_hex((char *) registers, out_buffer, NUMREGBYTES);
put_packet(out_buffer);
}
/* Set register contents - currently can't set other thread's registers */
static void set_regs_msg(void)
{
kgdb_regs_to_gdb_regs(&trap_registers, registers);
hex_to_mem(&in_buffer[1], (char *) registers, NUMREGBYTES);
gdb_regs_to_kgdb_regs(registers, &trap_registers);
send_ok_msg();
}
#ifdef CONFIG_SH_KGDB_CONSOLE
/*
* Bring up the ports..
*/
static int __init kgdb_serial_setup(void)
{
struct console dummy;
return kgdb_console_setup(&dummy, 0);
}
#else
#define kgdb_serial_setup() 0
#endif
/* The command loop, read and act on requests */
static void kgdb_command_loop(const int excep_code, const int trapa_value)
{
int sigval;
/* Enter GDB mode (e.g. after detach) */
if (!kgdb_in_gdb_mode) {
/* Do serial setup, notify user, issue preemptive ack */
printk(KERN_NOTICE "KGDB: Waiting for GDB\n");
kgdb_in_gdb_mode = 1;
put_debug_char('+');
}
/* Reply to host that an exception has occurred */
sigval = compute_signal(excep_code);
send_signal_msg(sigval);
/* TRAP_VEC exception indicates a software trap inserted in place of
code by GDB so back up PC by one instruction, as this instruction
will later be replaced by its original one. Do NOT do this for
trap 0xff, since that indicates a compiled-in breakpoint which
will not be replaced (and we would retake the trap forever) */
if ((excep_code == TRAP_VEC) && (trapa_value != (0x3c << 2)))
trap_registers.pc -= 2;
/* Undo any stepping we may have done */
undo_single_step();
while (1) {
out_buffer[0] = 0;
get_packet(in_buffer, BUFMAX);
/* Examine first char of buffer to see what we need to do */
switch (in_buffer[0]) {
case '?': /* Send which signal we've received */
send_signal_msg(sigval);
break;
case 'g': /* Return the values of the CPU registers */
send_regs_msg();
break;
case 'G': /* Set the value of the CPU registers */
set_regs_msg();
break;
case 'm': /* Read LLLL bytes address AA..AA */
read_mem_msg();
break;
case 'M': /* Write LLLL bytes address AA..AA, ret OK */
write_mem_msg(0); /* 0 = data in hex */
break;
case 'X': /* Write LLLL bytes esc bin address AA..AA */
if (kgdb_bits == '8')
write_mem_msg(1); /* 1 = data in binary */
else
send_empty_msg();
break;
case 'C': /* Continue, signum included, we ignore it */
continue_with_sig_msg();
return;
case 'c': /* Continue at address AA..AA (optional) */
continue_msg();
return;
case 'S': /* Step, signum included, we ignore it */
step_with_sig_msg();
return;
case 's': /* Step one instruction from AA..AA */
step_msg();
return;
case 'k': /* 'Kill the program' with a kernel ? */
break;
case 'D': /* Detach from program, send reply OK */
kgdb_in_gdb_mode = 0;
send_ok_msg();
get_debug_char();
return;
default:
send_empty_msg();
break;
}
}
}
/* There has been an exception, most likely a breakpoint. */
static void handle_exception(struct pt_regs *regs)
{
int excep_code, vbr_val;
int count;
int trapa_value = ctrl_inl(TRA);
/* Copy kernel regs (from stack) */
for (count = 0; count < 16; count++)
trap_registers.regs[count] = regs->regs[count];
trap_registers.pc = regs->pc;
trap_registers.pr = regs->pr;
trap_registers.sr = regs->sr;
trap_registers.gbr = regs->gbr;
trap_registers.mach = regs->mach;
trap_registers.macl = regs->macl;
asm("stc vbr, %0":"=r"(vbr_val));
trap_registers.vbr = vbr_val;
/* Get excode for command loop call, user access */
asm("stc r2_bank, %0":"=r"(excep_code));
/* Act on the exception */
kgdb_command_loop(excep_code, trapa_value);
/* Copy back the (maybe modified) registers */
for (count = 0; count < 16; count++)
regs->regs[count] = trap_registers.regs[count];
regs->pc = trap_registers.pc;
regs->pr = trap_registers.pr;
regs->sr = trap_registers.sr;
regs->gbr = trap_registers.gbr;
regs->mach = trap_registers.mach;
regs->macl = trap_registers.macl;
vbr_val = trap_registers.vbr;
asm("ldc %0, vbr": :"r"(vbr_val));
}
asmlinkage void kgdb_handle_exception(unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7,
struct pt_regs __regs)
{
struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
handle_exception(regs);
}
/* Initialise the KGDB data structures and serial configuration */
int __init kgdb_init(void)
{
in_nmi = 0;
kgdb_nofault = 0;
stepped_opcode = 0;
kgdb_in_gdb_mode = 0;
if (kgdb_serial_setup() != 0) {
printk(KERN_NOTICE "KGDB: serial setup error\n");
return -1;
}
/* Init ptr to exception handler */
kgdb_debug_hook = handle_exception;
kgdb_bus_err_hook = kgdb_handle_bus_error;
/* Enter kgdb now if requested, or just report init done */
printk(KERN_NOTICE "KGDB: stub is initialized.\n");
return 0;
}
/* Make function available for "user messages"; console will use it too. */
char gdbmsgbuf[BUFMAX];
#define MAXOUT ((BUFMAX-2)/2)
static void kgdb_msg_write(const char *s, unsigned count)
{
int i;
int wcount;
char *bufptr;
/* 'O'utput */
gdbmsgbuf[0] = 'O';
/* Fill and send buffers... */
while (count > 0) {
bufptr = gdbmsgbuf + 1;
/* Calculate how many this time */
wcount = (count > MAXOUT) ? MAXOUT : count;
/* Pack in hex chars */
for (i = 0; i < wcount; i++)
bufptr = pack_hex_byte(bufptr, s[i]);
*bufptr = '\0';
/* Move up */
s += wcount;
count -= wcount;
/* Write packet */
put_packet(gdbmsgbuf);
}
}
static void kgdb_to_gdb(const char *s)
{
kgdb_msg_write(s, strlen(s));
}
#ifdef CONFIG_SH_KGDB_CONSOLE
void kgdb_console_write(struct console *co, const char *s, unsigned count)
{
/* Bail if we're not talking to GDB */
if (!kgdb_in_gdb_mode)
return;
kgdb_msg_write(s, count);
}
#endif
#ifdef CONFIG_KGDB_SYSRQ
static void sysrq_handle_gdb(int key, struct tty_struct *tty)
{
printk("Entering GDB stub\n");
breakpoint();
}
static struct sysrq_key_op sysrq_gdb_op = {
.handler = sysrq_handle_gdb,
.help_msg = "Gdb",
.action_msg = "GDB",
};
static int gdb_register_sysrq(void)
{
printk("Registering GDB sysrq handler\n");
register_sysrq_key('g', &sysrq_gdb_op);
return 0;
}
module_init(gdb_register_sysrq);
#endif
arch/sh/kernel/time_32.c
View file @ ab6e570b
...@@ -277,11 +277,4 @@ void __init time_init(void) ...@@ -277,11 +277,4 @@ void __init time_init(void)
((sh_hpt_frequency + 500) / 1000) / 1000, ((sh_hpt_frequency + 500) / 1000) / 1000,
((sh_hpt_frequency + 500) / 1000) % 1000); ((sh_hpt_frequency + 500) / 1000) % 1000);
#if defined(CONFIG_SH_KGDB)
/*
* Set up kgdb as requested. We do it here because the serial
* init uses the timer vars we just set up for figuring baud.
*/
kgdb_init();
#endif
} }
arch/sh/kernel/traps_32.c
View file @ ab6e570b
...@@ -28,17 +28,6 @@ ...@@ -28,17 +28,6 @@
#include <asm/fpu.h> #include <asm/fpu.h>
#include <asm/kprobes.h> #include <asm/kprobes.h>
#ifdef CONFIG_SH_KGDB
#include <asm/kgdb.h>
#define CHK_REMOTE_DEBUG(regs) \
{ \
if (kgdb_debug_hook && !user_mode(regs))\
(*kgdb_debug_hook)(regs); \
}
#else
#define CHK_REMOTE_DEBUG(regs)
#endif
#ifdef CONFIG_CPU_SH2 #ifdef CONFIG_CPU_SH2
# define TRAP_RESERVED_INST 4 # define TRAP_RESERVED_INST 4
# define TRAP_ILLEGAL_SLOT_INST 6 # define TRAP_ILLEGAL_SLOT_INST 6
...@@ -94,7 +83,6 @@ void die(const char * str, struct pt_regs * regs, long err) ...@@ -94,7 +83,6 @@ void die(const char * str, struct pt_regs * regs, long err)
printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter); printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
CHK_REMOTE_DEBUG(regs);
print_modules(); print_modules();
show_regs(regs); show_regs(regs);
...@@ -683,7 +671,6 @@ asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5, ...@@ -683,7 +671,6 @@ asmlinkage void do_reserved_inst(unsigned long r4, unsigned long r5,
error_code = lookup_exception_vector(); error_code = lookup_exception_vector();
local_irq_enable(); local_irq_enable();
CHK_REMOTE_DEBUG(regs);
force_sig(SIGILL, tsk); force_sig(SIGILL, tsk);
die_if_no_fixup("reserved instruction", regs, error_code); die_if_no_fixup("reserved instruction", regs, error_code);
} }
...@@ -761,7 +748,6 @@ asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5, ...@@ -761,7 +748,6 @@ asmlinkage void do_illegal_slot_inst(unsigned long r4, unsigned long r5,
inst = lookup_exception_vector(); inst = lookup_exception_vector();
local_irq_enable(); local_irq_enable();
CHK_REMOTE_DEBUG(regs);
force_sig(SIGILL, tsk); force_sig(SIGILL, tsk);
die_if_no_fixup("illegal slot instruction", regs, inst); die_if_no_fixup("illegal slot instruction", regs, inst);
} }
......
arch/sh/mm/fault_32.c
View file @ ab6e570b
...@@ -20,7 +20,6 @@ ...@@ -20,7 +20,6 @@
#include <asm/system.h> #include <asm/system.h>
#include <asm/mmu_context.h> #include <asm/mmu_context.h>
#include <asm/tlbflush.h> #include <asm/tlbflush.h>
#include <asm/kgdb.h>
/* /*
* This routine handles page faults. It determines the address, * This routine handles page faults. It determines the address,
...@@ -282,11 +281,6 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs, ...@@ -282,11 +281,6 @@ asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs,
if (notify_page_fault(regs, lookup_exception_vector())) if (notify_page_fault(regs, lookup_exception_vector()))
goto out; goto out;
#ifdef CONFIG_SH_KGDB
if (kgdb_nofault && kgdb_bus_err_hook)
kgdb_bus_err_hook();
#endif
ret = 1; ret = 1;
/* /*
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7