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[PARISC] unwinder improvements

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Add special-case handling for "handle_interruption" so that we can rewind
past the interruption. This is useful for seeing what caused a BUG() or
WARN_ON(); otherwise the unwind stops at the interruption.

Signed-off-by: Randolph Chung <tausq@debian.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Randolph Chung 2007-06-12 14:27:32 +08:00 committed by Kyle McMartin
parent e036306aa1
commit 05dc16d6a1
1 changed files with 34 additions and 7 deletions
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41
arch/parisc/kernel/unwind.c
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@ -16,6 +16,8 @@
#include <asm/uaccess.h>
#include <asm/assembly.h>
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>
#include <asm/unwind.h>
@ -199,6 +201,29 @@ static int unwind_init(void)
return 0;
}
#ifdef CONFIG_64BIT
#define get_func_addr(fptr) fptr[2]
#else
#define get_func_addr(fptr) fptr[0]
#endif
static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)
{
void handle_interruption(int, struct pt_regs *);
static unsigned long *hi = (unsigned long)&handle_interruption;
if (pc == get_func_addr(hi)) {
struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);
dbg("Unwinding through handle_interruption()\n");
info->prev_sp = regs->gr[30];
info->prev_ip = regs->iaoq[0];
return 1;
}
return 0;
}
static void unwind_frame_regs(struct unwind_frame_info *info)
{
const struct unwind_table_entry *e;
@ -312,13 +337,15 @@ static void unwind_frame_regs(struct unwind_frame_info *info)
}
}
info->prev_sp = info->sp - frame_size;
if (e->Millicode)
info->rp = info->r31;
else if (rpoffset)
info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
info->prev_ip = info->rp;
info->rp = 0;
if (!unwind_special(info, e->region_start, frame_size)) {
info->prev_sp = info->sp - frame_size;
if (e->Millicode)
info->rp = info->r31;
else if (rpoffset)
info->rp = *(unsigned long *)(info->prev_sp - rpoffset);
info->prev_ip = info->rp;
info->rp = 0;
}
dbg("analyzing func @ %lx, setting prev_sp=%lx "
"prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp,