495 lines
14 KiB
C
495 lines
14 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* PowerPC backend to the KGDB stub.
|
||
|
|
*
|
||
|
|
* 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
|
||
|
|
* Copyright (C) 2003 Timesys Corporation.
|
||
|
|
* Copyright (C) 2004-2006 MontaVista Software, Inc.
|
||
|
|
* PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
|
||
|
|
* PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
|
||
|
|
* Sergei Shtylyov <sshtylyov@ru.mvista.com>
|
||
|
|
* Copyright (C) 2007-2008 Wind River Systems, Inc.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/kgdb.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/signal.h>
|
||
|
|
#include <linux/ptrace.h>
|
||
|
|
#include <linux/kdebug.h>
|
||
|
|
#include <asm/current.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/machdep.h>
|
||
|
|
#include <asm/debug.h>
|
||
|
|
#include <asm/code-patching.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <asm/inst.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This table contains the mapping between PowerPC hardware trap types, and
|
||
|
|
* signals, which are primarily what GDB understands. GDB and the kernel
|
||
|
|
* don't always agree on values, so we use constants taken from gdb-6.2.
|
||
|
|
*/
|
||
|
|
static struct hard_trap_info
|
||
|
|
{
|
||
|
|
unsigned int tt; /* Trap type code for powerpc */
|
||
|
|
unsigned char signo; /* Signal that we map this trap into */
|
||
|
|
} hard_trap_info[] = {
|
||
|
|
{ 0x0100, 0x02 /* SIGINT */ }, /* system reset */
|
||
|
|
{ 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */
|
||
|
|
{ 0x0300, 0x0b /* SIGSEGV */ }, /* data access */
|
||
|
|
{ 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */
|
||
|
|
{ 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */
|
||
|
|
{ 0x0600, 0x0a /* SIGBUS */ }, /* alignment */
|
||
|
|
{ 0x0700, 0x05 /* SIGTRAP */ }, /* program check */
|
||
|
|
{ 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */
|
||
|
|
{ 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */
|
||
|
|
{ 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */
|
||
|
|
#ifdef CONFIG_BOOKE_OR_40x
|
||
|
|
{ 0x2002, 0x05 /* SIGTRAP */ }, /* debug */
|
||
|
|
#if defined(CONFIG_PPC_85xx)
|
||
|
|
{ 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */
|
||
|
|
{ 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */
|
||
|
|
{ 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */
|
||
|
|
{ 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */
|
||
|
|
{ 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */
|
||
|
|
{ 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */
|
||
|
|
{ 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */
|
||
|
|
{ 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */
|
||
|
|
{ 0x3200, 0x02 /* SIGINT */ }, /* watchdog */
|
||
|
|
#else /* ! CONFIG_PPC_85xx */
|
||
|
|
{ 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */
|
||
|
|
{ 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */
|
||
|
|
{ 0x1020, 0x02 /* SIGINT */ }, /* watchdog */
|
||
|
|
{ 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */
|
||
|
|
{ 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */
|
||
|
|
#endif
|
||
|
|
#else /* !CONFIG_BOOKE_OR_40x */
|
||
|
|
{ 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */
|
||
|
|
#if defined(CONFIG_PPC_8xx)
|
||
|
|
{ 0x1000, 0x04 /* SIGILL */ }, /* software emulation */
|
||
|
|
#else /* ! CONFIG_PPC_8xx */
|
||
|
|
{ 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */
|
||
|
|
{ 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */
|
||
|
|
{ 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */
|
||
|
|
#if defined(CONFIG_PPC64)
|
||
|
|
{ 0x1200, 0x05 /* SIGILL */ }, /* system error */
|
||
|
|
{ 0x1500, 0x04 /* SIGILL */ }, /* soft patch */
|
||
|
|
{ 0x1600, 0x04 /* SIGILL */ }, /* maintenance */
|
||
|
|
{ 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */
|
||
|
|
{ 0x1800, 0x04 /* SIGILL */ }, /* thermal */
|
||
|
|
#else /* ! CONFIG_PPC64 */
|
||
|
|
{ 0x1400, 0x02 /* SIGINT */ }, /* SMI */
|
||
|
|
{ 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */
|
||
|
|
{ 0x1700, 0x04 /* SIGILL */ }, /* TAU */
|
||
|
|
{ 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
{ 0x0000, 0x00 } /* Must be last */
|
||
|
|
};
|
||
|
|
|
||
|
|
static int computeSignal(unsigned int tt)
|
||
|
|
{
|
||
|
|
struct hard_trap_info *ht;
|
||
|
|
|
||
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
||
|
|
if (ht->tt == tt)
|
||
|
|
return ht->signo;
|
||
|
|
|
||
|
|
return SIGHUP; /* default for things we don't know about */
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
*
|
||
|
|
* kgdb_skipexception - Bail out of KGDB when we've been triggered.
|
||
|
|
* @exception: Exception vector number
|
||
|
|
* @regs: Current &struct pt_regs.
|
||
|
|
*
|
||
|
|
* On some architectures we need to skip a breakpoint exception when
|
||
|
|
* it occurs after a breakpoint has been removed.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
int kgdb_skipexception(int exception, struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
return kgdb_isremovedbreak(regs->nip);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kgdb_debugger_ipi(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
kgdb_nmicallback(raw_smp_processor_id(), regs);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
void kgdb_roundup_cpus(void)
|
||
|
|
{
|
||
|
|
smp_send_debugger_break();
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* KGDB functions to use existing PowerPC64 hooks. */
|
||
|
|
static int kgdb_debugger(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
|
||
|
|
DIE_OOPS, regs);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kgdb_handle_breakpoint(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
if (user_mode(regs))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (*(u32 *)regs->nip == BREAK_INSTR)
|
||
|
|
regs_add_return_ip(regs, BREAK_INSTR_SIZE);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kgdb_singlestep(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
if (user_mode(regs))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
kgdb_handle_exception(0, SIGTRAP, 0, regs);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kgdb_iabr_match(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
if (user_mode(regs))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
|
||
|
|
return 0;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kgdb_break_match(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
if (user_mode(regs))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
|
||
|
|
return 0;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)
|
||
|
|
|
||
|
|
#define PACK32(ptr, src) do { \
|
||
|
|
u32 *ptr32; \
|
||
|
|
ptr32 = (u32 *)ptr; \
|
||
|
|
*(ptr32++) = (src); \
|
||
|
|
ptr = (unsigned long *)ptr32; \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
|
||
|
|
{
|
||
|
|
struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
|
||
|
|
STACK_FRAME_OVERHEAD);
|
||
|
|
unsigned long *ptr = gdb_regs;
|
||
|
|
int reg;
|
||
|
|
|
||
|
|
memset(gdb_regs, 0, NUMREGBYTES);
|
||
|
|
|
||
|
|
/* Regs GPR0-2 */
|
||
|
|
for (reg = 0; reg < 3; reg++)
|
||
|
|
PACK64(ptr, regs->gpr[reg]);
|
||
|
|
|
||
|
|
/* Regs GPR3-13 are caller saved, not in regs->gpr[] */
|
||
|
|
ptr += 11;
|
||
|
|
|
||
|
|
/* Regs GPR14-31 */
|
||
|
|
for (reg = 14; reg < 32; reg++)
|
||
|
|
PACK64(ptr, regs->gpr[reg]);
|
||
|
|
|
||
|
|
#ifdef CONFIG_PPC_85xx
|
||
|
|
#ifdef CONFIG_SPE
|
||
|
|
for (reg = 0; reg < 32; reg++)
|
||
|
|
PACK64(ptr, p->thread.evr[reg]);
|
||
|
|
#else
|
||
|
|
ptr += 32;
|
||
|
|
#endif
|
||
|
|
#else
|
||
|
|
/* fp registers not used by kernel, leave zero */
|
||
|
|
ptr += 32 * 8 / sizeof(long);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
PACK64(ptr, regs->nip);
|
||
|
|
PACK64(ptr, regs->msr);
|
||
|
|
PACK32(ptr, regs->ccr);
|
||
|
|
PACK64(ptr, regs->link);
|
||
|
|
PACK64(ptr, regs->ctr);
|
||
|
|
PACK32(ptr, regs->xer);
|
||
|
|
|
||
|
|
BUG_ON((unsigned long)ptr >
|
||
|
|
(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
|
||
|
|
}
|
||
|
|
|
||
|
|
#define GDB_SIZEOF_REG sizeof(unsigned long)
|
||
|
|
#define GDB_SIZEOF_REG_U32 sizeof(u32)
|
||
|
|
|
||
|
|
#ifdef CONFIG_PPC_85xx
|
||
|
|
#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
|
||
|
|
#else
|
||
|
|
#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
|
||
|
|
{
|
||
|
|
{ "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
|
||
|
|
{ "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
|
||
|
|
{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
|
||
|
|
{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
|
||
|
|
{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
|
||
|
|
{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
|
||
|
|
{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
|
||
|
|
{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
|
||
|
|
{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
|
||
|
|
{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
|
||
|
|
{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
|
||
|
|
{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
|
||
|
|
{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
|
||
|
|
{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
|
||
|
|
{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
|
||
|
|
{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
|
||
|
|
{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
|
||
|
|
{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
|
||
|
|
{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
|
||
|
|
{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
|
||
|
|
{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
|
||
|
|
{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
|
||
|
|
{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
|
||
|
|
{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
|
||
|
|
{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
|
||
|
|
{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
|
||
|
|
{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
|
||
|
|
{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
|
||
|
|
{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
|
||
|
|
{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
|
||
|
|
{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
|
||
|
|
{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
|
||
|
|
|
||
|
|
{ "f0", GDB_SIZEOF_FLOAT_REG, 0 },
|
||
|
|
{ "f1", GDB_SIZEOF_FLOAT_REG, 1 },
|
||
|
|
{ "f2", GDB_SIZEOF_FLOAT_REG, 2 },
|
||
|
|
{ "f3", GDB_SIZEOF_FLOAT_REG, 3 },
|
||
|
|
{ "f4", GDB_SIZEOF_FLOAT_REG, 4 },
|
||
|
|
{ "f5", GDB_SIZEOF_FLOAT_REG, 5 },
|
||
|
|
{ "f6", GDB_SIZEOF_FLOAT_REG, 6 },
|
||
|
|
{ "f7", GDB_SIZEOF_FLOAT_REG, 7 },
|
||
|
|
{ "f8", GDB_SIZEOF_FLOAT_REG, 8 },
|
||
|
|
{ "f9", GDB_SIZEOF_FLOAT_REG, 9 },
|
||
|
|
{ "f10", GDB_SIZEOF_FLOAT_REG, 10 },
|
||
|
|
{ "f11", GDB_SIZEOF_FLOAT_REG, 11 },
|
||
|
|
{ "f12", GDB_SIZEOF_FLOAT_REG, 12 },
|
||
|
|
{ "f13", GDB_SIZEOF_FLOAT_REG, 13 },
|
||
|
|
{ "f14", GDB_SIZEOF_FLOAT_REG, 14 },
|
||
|
|
{ "f15", GDB_SIZEOF_FLOAT_REG, 15 },
|
||
|
|
{ "f16", GDB_SIZEOF_FLOAT_REG, 16 },
|
||
|
|
{ "f17", GDB_SIZEOF_FLOAT_REG, 17 },
|
||
|
|
{ "f18", GDB_SIZEOF_FLOAT_REG, 18 },
|
||
|
|
{ "f19", GDB_SIZEOF_FLOAT_REG, 19 },
|
||
|
|
{ "f20", GDB_SIZEOF_FLOAT_REG, 20 },
|
||
|
|
{ "f21", GDB_SIZEOF_FLOAT_REG, 21 },
|
||
|
|
{ "f22", GDB_SIZEOF_FLOAT_REG, 22 },
|
||
|
|
{ "f23", GDB_SIZEOF_FLOAT_REG, 23 },
|
||
|
|
{ "f24", GDB_SIZEOF_FLOAT_REG, 24 },
|
||
|
|
{ "f25", GDB_SIZEOF_FLOAT_REG, 25 },
|
||
|
|
{ "f26", GDB_SIZEOF_FLOAT_REG, 26 },
|
||
|
|
{ "f27", GDB_SIZEOF_FLOAT_REG, 27 },
|
||
|
|
{ "f28", GDB_SIZEOF_FLOAT_REG, 28 },
|
||
|
|
{ "f29", GDB_SIZEOF_FLOAT_REG, 29 },
|
||
|
|
{ "f30", GDB_SIZEOF_FLOAT_REG, 30 },
|
||
|
|
{ "f31", GDB_SIZEOF_FLOAT_REG, 31 },
|
||
|
|
|
||
|
|
{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
|
||
|
|
{ "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
|
||
|
|
{ "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
|
||
|
|
{ "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
|
||
|
|
{ "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
|
||
|
|
{ "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
|
||
|
|
};
|
||
|
|
|
||
|
|
char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
if (regno >= DBG_MAX_REG_NUM || regno < 0)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
if (regno < 32 || regno >= 64)
|
||
|
|
/* First 0 -> 31 gpr registers*/
|
||
|
|
/* pc, msr, ls... registers 64 -> 69 */
|
||
|
|
memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
|
||
|
|
dbg_reg_def[regno].size);
|
||
|
|
|
||
|
|
if (regno >= 32 && regno < 64) {
|
||
|
|
/* FP registers 32 -> 63 */
|
||
|
|
#if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE)
|
||
|
|
if (current)
|
||
|
|
memcpy(mem, ¤t->thread.evr[regno-32],
|
||
|
|
dbg_reg_def[regno].size);
|
||
|
|
#else
|
||
|
|
/* fp registers not used by kernel, leave zero */
|
||
|
|
memset(mem, 0, dbg_reg_def[regno].size);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
return dbg_reg_def[regno].name;
|
||
|
|
}
|
||
|
|
|
||
|
|
int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
if (regno >= DBG_MAX_REG_NUM || regno < 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (regno < 32 || regno >= 64)
|
||
|
|
/* First 0 -> 31 gpr registers*/
|
||
|
|
/* pc, msr, ls... registers 64 -> 69 */
|
||
|
|
memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
|
||
|
|
dbg_reg_def[regno].size);
|
||
|
|
|
||
|
|
if (regno >= 32 && regno < 64) {
|
||
|
|
/* FP registers 32 -> 63 */
|
||
|
|
#if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE)
|
||
|
|
memcpy(¤t->thread.evr[regno-32], mem,
|
||
|
|
dbg_reg_def[regno].size);
|
||
|
|
#else
|
||
|
|
/* fp registers not used by kernel, leave zero */
|
||
|
|
return 0;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
|
||
|
|
{
|
||
|
|
regs_set_return_ip(regs, pc);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This function does PowerPC specific processing for interfacing to gdb.
|
||
|
|
*/
|
||
|
|
int kgdb_arch_handle_exception(int vector, int signo, int err_code,
|
||
|
|
char *remcom_in_buffer, char *remcom_out_buffer,
|
||
|
|
struct pt_regs *linux_regs)
|
||
|
|
{
|
||
|
|
char *ptr = &remcom_in_buffer[1];
|
||
|
|
unsigned long addr;
|
||
|
|
|
||
|
|
switch (remcom_in_buffer[0]) {
|
||
|
|
/*
|
||
|
|
* sAA..AA Step one instruction from AA..AA
|
||
|
|
* This will return an error to gdb ..
|
||
|
|
*/
|
||
|
|
case 's':
|
||
|
|
case 'c':
|
||
|
|
/* handle the optional parameter */
|
||
|
|
if (kgdb_hex2long(&ptr, &addr))
|
||
|
|
regs_set_return_ip(linux_regs, addr);
|
||
|
|
|
||
|
|
atomic_set(&kgdb_cpu_doing_single_step, -1);
|
||
|
|
/* set the trace bit if we're stepping */
|
||
|
|
if (remcom_in_buffer[0] == 's') {
|
||
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
||
|
|
mtspr(SPRN_DBCR0,
|
||
|
|
mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
|
||
|
|
regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE);
|
||
|
|
#else
|
||
|
|
regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE);
|
||
|
|
#endif
|
||
|
|
atomic_set(&kgdb_cpu_doing_single_step,
|
||
|
|
raw_smp_processor_id());
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
|
||
|
|
{
|
||
|
|
u32 instr, *addr = (u32 *)bpt->bpt_addr;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = get_kernel_nofault(instr, addr);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
err = patch_instruction(addr, ppc_inst(BREAK_INSTR));
|
||
|
|
if (err)
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
*(u32 *)bpt->saved_instr = instr;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
unsigned int instr = *(unsigned int *)bpt->saved_instr;
|
||
|
|
u32 *addr = (u32 *)bpt->bpt_addr;
|
||
|
|
|
||
|
|
err = patch_instruction(addr, ppc_inst(instr));
|
||
|
|
if (err)
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Global data
|
||
|
|
*/
|
||
|
|
const struct kgdb_arch arch_kgdb_ops;
|
||
|
|
|
||
|
|
static int kgdb_not_implemented(struct pt_regs *regs)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void *old__debugger_ipi;
|
||
|
|
static void *old__debugger;
|
||
|
|
static void *old__debugger_bpt;
|
||
|
|
static void *old__debugger_sstep;
|
||
|
|
static void *old__debugger_iabr_match;
|
||
|
|
static void *old__debugger_break_match;
|
||
|
|
static void *old__debugger_fault_handler;
|
||
|
|
|
||
|
|
int kgdb_arch_init(void)
|
||
|
|
{
|
||
|
|
old__debugger_ipi = __debugger_ipi;
|
||
|
|
old__debugger = __debugger;
|
||
|
|
old__debugger_bpt = __debugger_bpt;
|
||
|
|
old__debugger_sstep = __debugger_sstep;
|
||
|
|
old__debugger_iabr_match = __debugger_iabr_match;
|
||
|
|
old__debugger_break_match = __debugger_break_match;
|
||
|
|
old__debugger_fault_handler = __debugger_fault_handler;
|
||
|
|
|
||
|
|
__debugger_ipi = kgdb_debugger_ipi;
|
||
|
|
__debugger = kgdb_debugger;
|
||
|
|
__debugger_bpt = kgdb_handle_breakpoint;
|
||
|
|
__debugger_sstep = kgdb_singlestep;
|
||
|
|
__debugger_iabr_match = kgdb_iabr_match;
|
||
|
|
__debugger_break_match = kgdb_break_match;
|
||
|
|
__debugger_fault_handler = kgdb_not_implemented;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void kgdb_arch_exit(void)
|
||
|
|
{
|
||
|
|
__debugger_ipi = old__debugger_ipi;
|
||
|
|
__debugger = old__debugger;
|
||
|
|
__debugger_bpt = old__debugger_bpt;
|
||
|
|
__debugger_sstep = old__debugger_sstep;
|
||
|
|
__debugger_iabr_match = old__debugger_iabr_match;
|
||
|
|
__debugger_break_match = old__debugger_break_match;
|
||
|
|
__debugger_fault_handler = old__debugger_fault_handler;
|
||
|
|
}
|