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[MIPS] dump_stack() based on prologue code analysis

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Instead of dump all possible address in the stack, unwind the stack frame
based on prologue code analysis, as like as get_wchan() does.  While the
code analysis might fail for some reason, there is a new kernel option
"raw_show_trace" to disable this feature.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2006-07-29 23:27:20 +09:00 • committed by Ralf Baechle
parent 79495d876c
commit f66686f70a
2 changed files with 141 additions and 23 deletions
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66
arch/mips/kernel/process.c
View file

@ -281,7 +281,7 @@ static struct mips_frame_info {
} *schedule_frame, mfinfo[64];
static int mfinfo_num;
static int __init get_frame_info(struct mips_frame_info *info)
static int get_frame_info(struct mips_frame_info *info)
{
int i;
void *func = info->func;
@ -329,14 +329,12 @@ static int __init get_frame_info(struct mips_frame_info *info)
ip->i_format.simmediate / sizeof(long);
}
}
if (info->pc_offset == -1 || info->frame_size == 0) {
if (func == schedule)
printk("Can't analyze prologue code at %p\n", func);
info->pc_offset = -1;
info->frame_size = 0;
}
return 0;
if (info->frame_size && info->pc_offset >= 0) /* nested */
return 0;
if (info->pc_offset < 0) /* leaf */
return 1;
/* prologue seems boggus... */
return -1;
}
static int __init frame_info_init(void)
@ -367,8 +365,15 @@ static int __init frame_info_init(void)
mfinfo[0].func = schedule;
schedule_frame = &mfinfo[0];
#endif
for (i = 0; i < ARRAY_SIZE(mfinfo) && mfinfo[i].func; i++)
get_frame_info(&mfinfo[i]);
for (i = 0; i < ARRAY_SIZE(mfinfo) && mfinfo[i].func; i++) {
struct mips_frame_info *info = &mfinfo[i];
if (get_frame_info(info)) {
/* leaf or unknown */
if (info->func == schedule)
printk("Can't analyze prologue code at %p\n",
info->func);
}
}
mfinfo_num = i;
return 0;
@ -427,6 +432,8 @@ unsigned long get_wchan(struct task_struct *p)
if (i < 0)
break;
if (mfinfo[i].pc_offset < 0)
break;
pc = ((unsigned long *)frame)[mfinfo[i].pc_offset];
if (!mfinfo[i].frame_size)
break;
@ -437,3 +444,40 @@ unsigned long get_wchan(struct task_struct *p)
return pc;
}
#ifdef CONFIG_KALLSYMS
/* used by show_frametrace() */
unsigned long unwind_stack(struct task_struct *task,
unsigned long **sp, unsigned long pc)
{
unsigned long stack_page;
struct mips_frame_info info;
char *modname;
char namebuf[KSYM_NAME_LEN + 1];
unsigned long size, ofs;
stack_page = (unsigned long)task_stack_page(task);
if (!stack_page)
return 0;
if (!kallsyms_lookup(pc, &size, &ofs, &modname, namebuf))
return 0;
if (ofs == 0)
return 0;
info.func = (void *)(pc - ofs);
info.func_size = ofs; /* analyze from start to ofs */
if (get_frame_info(&info)) {
/* leaf or unknown */
*sp += info.frame_size / sizeof(long);
return 0;
}
if ((unsigned long)*sp < stack_page ||
(unsigned long)*sp + info.frame_size / sizeof(long) >
stack_page + THREAD_SIZE - 32)
return 0;
pc = (*sp)[info.pc_offset];
*sp += info.frame_size / sizeof(long);
return pc;
}
#endif