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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel…
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…/git/jwessel/linux-2.6-kgdb

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  debug_core,kdb: fix crash when arch does not have single step
  kgdb,x86: use macro HBP_NUM to replace magic number 4
  kgdb,mips: remove unused kgdb_cpu_doing_single_step operations
  mm,kdb,kgdb: Add a debug reference for the kdb kmap usage
  KGDB: Remove set but unused newPC
  ftrace,kdb: Allow dumping a specific cpu's buffer with ftdump
  ftrace,kdb: Extend kdb to be able to dump the ftrace buffer
  kgdb,powerpc: Replace hardcoded offset by BREAK_INSTR_SIZE
  arm,kgdb: Add ability to trap into debugger on notify_die
  gdbstub: do not directly use dbg_reg_def[] in gdb_cmd_reg_set()
  gdbstub: Implement gdbserial 'p' and 'P' packets
  kgdb,arm: Individual register get/set for arm
  kgdb,mips: Individual register get/set for mips
  kgdb,x86: Individual register get/set for x86
  kgdb,kdb: individual register set and and get API
  gdbstub: Optimize kgdb's "thread:" response for the gdb serial protocol
  kgdb: remove custom hex_to_bin()implementation
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Linus Torvalds committed Aug 5, 2010
2 parents 03c0c29 + 3fa43ab commit 89a6c8c
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Showing 16 changed files with 801 additions and 316 deletions.
6 changes: 3 additions & 3 deletions arch/arm/include/asm/kgdb.h
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Original file line number Diff line number Diff line change
Expand Up @@ -70,11 +70,11 @@ extern int kgdb_fault_expected;
#define _GP_REGS 16
#define _FP_REGS 8
#define _EXTRA_REGS 2
#define GDB_MAX_REGS (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)
#define DBG_MAX_REG_NUM (_GP_REGS + (_FP_REGS * 3) + _EXTRA_REGS)

#define KGDB_MAX_NO_CPUS 1
#define BUFMAX 400
#define NUMREGBYTES (GDB_MAX_REGS << 2)
#define NUMREGBYTES (DBG_MAX_REG_NUM << 2)
#define NUMCRITREGBYTES (32 << 2)

#define _R0 0
Expand All @@ -93,7 +93,7 @@ extern int kgdb_fault_expected;
#define _SPT 13
#define _LR 14
#define _PC 15
#define _CPSR (GDB_MAX_REGS - 1)
#define _CPSR (DBG_MAX_REG_NUM - 1)

/*
* So that we can denote the end of a frame for tracing,
Expand Down
124 changes: 81 additions & 43 deletions arch/arm/kernel/kgdb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,57 +10,62 @@
* Deepak Saxena <dsaxena@plexity.net>
*/
#include <linux/irq.h>
#include <linux/kdebug.h>
#include <linux/kgdb.h>
#include <asm/traps.h>

/* Make a local copy of the registers passed into the handler (bletch) */
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
int regno;

/* Initialize all to zero. */
for (regno = 0; regno < GDB_MAX_REGS; regno++)
gdb_regs[regno] = 0;
{ "r0", 4, offsetof(struct pt_regs, ARM_r0)},
{ "r1", 4, offsetof(struct pt_regs, ARM_r1)},
{ "r2", 4, offsetof(struct pt_regs, ARM_r2)},
{ "r3", 4, offsetof(struct pt_regs, ARM_r3)},
{ "r4", 4, offsetof(struct pt_regs, ARM_r4)},
{ "r5", 4, offsetof(struct pt_regs, ARM_r5)},
{ "r6", 4, offsetof(struct pt_regs, ARM_r6)},
{ "r7", 4, offsetof(struct pt_regs, ARM_r7)},
{ "r8", 4, offsetof(struct pt_regs, ARM_r8)},
{ "r9", 4, offsetof(struct pt_regs, ARM_r9)},
{ "r10", 4, offsetof(struct pt_regs, ARM_r10)},
{ "fp", 4, offsetof(struct pt_regs, ARM_fp)},
{ "ip", 4, offsetof(struct pt_regs, ARM_ip)},
{ "sp", 4, offsetof(struct pt_regs, ARM_sp)},
{ "lr", 4, offsetof(struct pt_regs, ARM_lr)},
{ "pc", 4, offsetof(struct pt_regs, ARM_pc)},
{ "f0", 12, -1 },
{ "f1", 12, -1 },
{ "f2", 12, -1 },
{ "f3", 12, -1 },
{ "f4", 12, -1 },
{ "f5", 12, -1 },
{ "f6", 12, -1 },
{ "f7", 12, -1 },
{ "fps", 4, -1 },
{ "cpsr", 4, offsetof(struct pt_regs, ARM_cpsr)},
};

gdb_regs[_R0] = kernel_regs->ARM_r0;
gdb_regs[_R1] = kernel_regs->ARM_r1;
gdb_regs[_R2] = kernel_regs->ARM_r2;
gdb_regs[_R3] = kernel_regs->ARM_r3;
gdb_regs[_R4] = kernel_regs->ARM_r4;
gdb_regs[_R5] = kernel_regs->ARM_r5;
gdb_regs[_R6] = kernel_regs->ARM_r6;
gdb_regs[_R7] = kernel_regs->ARM_r7;
gdb_regs[_R8] = kernel_regs->ARM_r8;
gdb_regs[_R9] = kernel_regs->ARM_r9;
gdb_regs[_R10] = kernel_regs->ARM_r10;
gdb_regs[_FP] = kernel_regs->ARM_fp;
gdb_regs[_IP] = kernel_regs->ARM_ip;
gdb_regs[_SPT] = kernel_regs->ARM_sp;
gdb_regs[_LR] = kernel_regs->ARM_lr;
gdb_regs[_PC] = kernel_regs->ARM_pc;
gdb_regs[_CPSR] = kernel_regs->ARM_cpsr;
char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return NULL;

if (dbg_reg_def[regno].offset != -1)
memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
dbg_reg_def[regno].size);
else
memset(mem, 0, dbg_reg_def[regno].size);
return dbg_reg_def[regno].name;
}

/* Copy local gdb registers back to kgdb regs, for later copy to kernel */
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs)
int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
kernel_regs->ARM_r0 = gdb_regs[_R0];
kernel_regs->ARM_r1 = gdb_regs[_R1];
kernel_regs->ARM_r2 = gdb_regs[_R2];
kernel_regs->ARM_r3 = gdb_regs[_R3];
kernel_regs->ARM_r4 = gdb_regs[_R4];
kernel_regs->ARM_r5 = gdb_regs[_R5];
kernel_regs->ARM_r6 = gdb_regs[_R6];
kernel_regs->ARM_r7 = gdb_regs[_R7];
kernel_regs->ARM_r8 = gdb_regs[_R8];
kernel_regs->ARM_r9 = gdb_regs[_R9];
kernel_regs->ARM_r10 = gdb_regs[_R10];
kernel_regs->ARM_fp = gdb_regs[_FP];
kernel_regs->ARM_ip = gdb_regs[_IP];
kernel_regs->ARM_sp = gdb_regs[_SPT];
kernel_regs->ARM_lr = gdb_regs[_LR];
kernel_regs->ARM_pc = gdb_regs[_PC];
kernel_regs->ARM_cpsr = gdb_regs[_CPSR];
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return -EINVAL;

if (dbg_reg_def[regno].offset != -1)
memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
dbg_reg_def[regno].size);
return 0;
}

void
Expand Down Expand Up @@ -176,6 +181,33 @@ void kgdb_roundup_cpus(unsigned long flags)
local_irq_disable();
}

static int __kgdb_notify(struct die_args *args, unsigned long cmd)
{
struct pt_regs *regs = args->regs;

if (kgdb_handle_exception(1, args->signr, cmd, regs))
return NOTIFY_DONE;
return NOTIFY_STOP;
}
static int
kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
{
unsigned long flags;
int ret;

local_irq_save(flags);
ret = __kgdb_notify(ptr, cmd);
local_irq_restore(flags);

return ret;
}

static struct notifier_block kgdb_notifier = {
.notifier_call = kgdb_notify,
.priority = -INT_MAX,
};


/**
* kgdb_arch_init - Perform any architecture specific initalization.
*
Expand All @@ -184,6 +216,11 @@ void kgdb_roundup_cpus(unsigned long flags)
*/
int kgdb_arch_init(void)
{
int ret = register_die_notifier(&kgdb_notifier);

if (ret != 0)
return ret;

register_undef_hook(&kgdb_brkpt_hook);
register_undef_hook(&kgdb_compiled_brkpt_hook);

Expand All @@ -200,6 +237,7 @@ void kgdb_arch_exit(void)
{
unregister_undef_hook(&kgdb_brkpt_hook);
unregister_undef_hook(&kgdb_compiled_brkpt_hook);
unregister_die_notifier(&kgdb_notifier);
}

/*
Expand Down
19 changes: 9 additions & 10 deletions arch/mips/include/asm/kgdb.h
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Original file line number Diff line number Diff line change
Expand Up @@ -8,28 +8,27 @@
#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
(_MIPS_ISA == _MIPS_ISA_MIPS32)

#define KGDB_GDB_REG_SIZE 32
#define KGDB_GDB_REG_SIZE 32
#define GDB_SIZEOF_REG sizeof(u32)

#elif (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
(_MIPS_ISA == _MIPS_ISA_MIPS64)

#ifdef CONFIG_32BIT
#define KGDB_GDB_REG_SIZE 32
#define KGDB_GDB_REG_SIZE 32
#define GDB_SIZEOF_REG sizeof(u32)
#else /* CONFIG_CPU_32BIT */
#define KGDB_GDB_REG_SIZE 64
#define KGDB_GDB_REG_SIZE 64
#define GDB_SIZEOF_REG sizeof(u64)
#endif
#else
#error "Need to set KGDB_GDB_REG_SIZE for MIPS ISA"
#endif /* _MIPS_ISA */

#define BUFMAX 2048
#if (KGDB_GDB_REG_SIZE == 32)
#define NUMREGBYTES (90*sizeof(u32))
#define NUMCRITREGBYTES (12*sizeof(u32))
#else
#define NUMREGBYTES (90*sizeof(u64))
#define NUMCRITREGBYTES (12*sizeof(u64))
#endif
#define DBG_MAX_REG_NUM 72
#define NUMREGBYTES (DBG_MAX_REG_NUM * sizeof(GDB_SIZEOF_REG))
#define NUMCRITREGBYTES (12 * sizeof(GDB_SIZEOF_REG))
#define BREAK_INSTR_SIZE 4
#define CACHE_FLUSH_IS_SAFE 0

Expand Down
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