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Blackfin arch: Add one more check on `fp' to prevent double fault

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Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Jie Zhang 2009-02-04 16:49:45 +08:00 committed by Bryan Wu
parent 45c4f2a0b6
commit 881eb621fc
1 changed files with 3 additions and 5 deletions
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8
arch/blackfin/kernel/traps.c
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@ -820,11 +820,8 @@ void show_stack(struct task_struct *task, unsigned long *stack)
decode_address(buf, (unsigned int)stack);
printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
addr = (unsigned int *)((unsigned int)stack & ~0x3F);
/* First thing is to look for a frame pointer */
for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
addr < endstack; addr++, i++) {
for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
if (*addr & 0x1)
continue;
ins_addr = (unsigned short *)*addr;
@ -834,7 +831,8 @@ void show_stack(struct task_struct *task, unsigned long *stack)
if (fp) {
/* Let's check to see if it is a frame pointer */
while (fp >= (addr - 1) && fp < endstack && fp)
while (fp >= (addr - 1) && fp < endstack
&& fp && ((unsigned int) fp & 0x3) == 0)
fp = (unsigned int *)*fp;
if (fp == 0 || fp == endstack) {
fp = addr - 1;