Release 4.11 arch/arm/kernel/kgdb.c
/*
* arch/arm/kernel/kgdb.c
*
* ARM KGDB support
*
* Copyright (c) 2002-2004 MontaVista Software, Inc
* Copyright (c) 2008 Wind River Systems, Inc.
*
* Authors: George Davis <davis_g@mvista.com>
* Deepak Saxena <dsaxena@plexity.net>
*/
#include <linux/irq.h>
#include <linux/kdebug.h>
#include <linux/kgdb.h>
#include <linux/uaccess.h>
#include <asm/patch.h>
#include <asm/traps.h>
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
{ "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)},
};
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 91 | 100.00% | 2 | 100.00% |
| Total | 91 | 100.00% | 2 | 100.00% |
int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 71 | 100.00% | 2 | 100.00% |
| Total | 71 | 100.00% | 2 | 100.00% |
void
sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
{
struct thread_info *ti;
int regno;
/* Just making sure... */
if (task == NULL)
return;
/* Initialize to zero */
for (regno = 0; regno < GDB_MAX_REGS; regno++)
gdb_regs[regno] = 0;
/* Otherwise, we have only some registers from switch_to() */
ti = task_thread_info(task);
gdb_regs[_R4] = ti->cpu_context.r4;
gdb_regs[_R5] = ti->cpu_context.r5;
gdb_regs[_R6] = ti->cpu_context.r6;
gdb_regs[_R7] = ti->cpu_context.r7;
gdb_regs[_R8] = ti->cpu_context.r8;
gdb_regs[_R9] = ti->cpu_context.r9;
gdb_regs[_R10] = ti->cpu_context.sl;
gdb_regs[_FP] = ti->cpu_context.fp;
gdb_regs[_SPT] = ti->cpu_context.sp;
gdb_regs[_PC] = ti->cpu_context.pc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 125 | 73.53% | 1 | 33.33% |
| Doug Anderson | 44 | 25.88% | 1 | 33.33% |
| Rabin Vincent | 1 | 0.59% | 1 | 33.33% |
| Total | 170 | 100.00% | 3 | 100.00% |
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
{
regs->ARM_pc = pc;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
static int compiled_break;
int kgdb_arch_handle_exception(int exception_vector, int signo,
int err_code, char *remcom_in_buffer,
char *remcom_out_buffer,
struct pt_regs *linux_regs)
{
unsigned long addr;
char *ptr;
switch (remcom_in_buffer[0]) {
case 'D':
case 'k':
case 'c':
/*
* Try to read optional parameter, pc unchanged if no parm.
* If this was a compiled breakpoint, we need to move
* to the next instruction or we will just breakpoint
* over and over again.
*/
ptr = &remcom_in_buffer[1];
if (kgdb_hex2long(&ptr, &addr))
linux_regs->ARM_pc = addr;
else if (compiled_break == 1)
linux_regs->ARM_pc += 4;
compiled_break = 0;
return 0;
}
return -1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 103 | 100.00% | 1 | 100.00% |
| Total | 103 | 100.00% | 1 | 100.00% |
static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr)
{
kgdb_handle_exception(1, SIGTRAP, 0, regs);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 29 | 100.00% | 1 | 100.00% |
| Total | 29 | 100.00% | 1 | 100.00% |
static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr)
{
compiled_break = 1;
kgdb_handle_exception(1, SIGTRAP, 0, regs);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 33 | 100.00% | 1 | 100.00% |
| Total | 33 | 100.00% | 1 | 100.00% |
static struct undef_hook kgdb_brkpt_hook = {
.instr_mask = 0xffffffff,
.instr_val = KGDB_BREAKINST,
.cpsr_mask = MODE_MASK,
.cpsr_val = SVC_MODE,
.fn = kgdb_brk_fn
};
static struct undef_hook kgdb_compiled_brkpt_hook = {
.instr_mask = 0xffffffff,
.instr_val = KGDB_COMPILED_BREAK,
.cpsr_mask = MODE_MASK,
.cpsr_val = SVC_MODE,
.fn = kgdb_compiled_brk_fn
};
static void kgdb_call_nmi_hook(void *ignored)
{
kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 19 | 100.00% | 1 | 100.00% |
| Total | 19 | 100.00% | 1 | 100.00% |
void kgdb_roundup_cpus(unsigned long flags)
{
local_irq_enable();
smp_call_function(kgdb_call_nmi_hook, NULL, 0);
local_irq_disable();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Will Deacon | 24 | 100.00% | 1 | 100.00% |
| Total | 24 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 45 | 100.00% | 1 | 100.00% |
| Total | 45 | 100.00% | 1 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 48 | 100.00% | 1 | 100.00% |
| Total | 48 | 100.00% | 1 | 100.00% |
static struct notifier_block kgdb_notifier = {
.notifier_call = kgdb_notify,
.priority = -INT_MAX,
};
/**
* kgdb_arch_init - Perform any architecture specific initalization.
*
* This function will handle the initalization of any architecture
* specific callbacks.
*/
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);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 40 | 100.00% | 2 | 100.00% |
| Total | 40 | 100.00% | 2 | 100.00% |
/**
* kgdb_arch_exit - Perform any architecture specific uninitalization.
*
* This function will handle the uninitalization of any architecture
* specific callbacks, for dynamic registration and unregistration.
*/
void kgdb_arch_exit(void)
{
unregister_undef_hook(&kgdb_brkpt_hook);
unregister_undef_hook(&kgdb_compiled_brkpt_hook);
unregister_die_notifier(&kgdb_notifier);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 25 | 100.00% | 2 | 100.00% |
| Total | 25 | 100.00% | 2 | 100.00% |
int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
/* patch_text() only supports int-sized breakpoints */
BUILD_BUG_ON(sizeof(int) != BREAK_INSTR_SIZE);
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
/* Machine is already stopped, so we can use __patch_text() directly */
__patch_text((void *)bpt->bpt_addr,
*(unsigned int *)arch_kgdb_ops.gdb_bpt_instr);
return err;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Douglas Anderson | 73 | 97.33% | 1 | 50.00% |
| Doug Anderson | 2 | 2.67% | 1 | 50.00% |
| Total | 75 | 100.00% | 2 | 100.00% |
int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
/* Machine is already stopped, so we can use __patch_text() directly */
__patch_text((void *)bpt->bpt_addr, *(unsigned int *)bpt->saved_instr);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Douglas Anderson | 33 | 94.29% | 1 | 50.00% |
| Doug Anderson | 2 | 5.71% | 1 | 50.00% |
| Total | 35 | 100.00% | 2 | 100.00% |
/*
* Register our undef instruction hooks with ARM undef core.
* We regsiter a hook specifically looking for the KGB break inst
* and we handle the normal undef case within the do_undefinstr
* handler.
*/
struct kgdb_arch arch_kgdb_ops = {
#ifndef __ARMEB__
.gdb_bpt_instr = {0xfe, 0xde, 0xff, 0xe7}
#else /* ! __ARMEB__ */
.gdb_bpt_instr = {0xe7, 0xff, 0xde, 0xfe}
#endif
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jason Wessel | 1058 | 82.27% | 4 | 36.36% |
| Douglas Anderson | 111 | 8.63% | 1 | 9.09% |
| Doug Anderson | 48 | 3.73% | 2 | 18.18% |
| Will Deacon | 46 | 3.58% | 1 | 9.09% |
| Omar Sandoval | 20 | 1.56% | 1 | 9.09% |
| Wang Nan | 2 | 0.16% | 1 | 9.09% |
| Rabin Vincent | 1 | 0.08% | 1 | 9.09% |
| Total | 1286 | 100.00% | 11 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.