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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-09-28 19:15:33 +0900
committerRalf Baechle <ralf@linux-mips.org>2006-10-01 23:16:58 +0100
commit23126692e30ec22760e0ef932c3c2fff00d440bb (patch)
tree1bdfdbe895090d6c73a2c6ea0aaf6b6fa9c2ebce /arch/mips/kernel/stacktrace.c
parentc8cc9618c55a341dda39357cce5ff39f7ad17132 (diff)
[MIPS] Stacktrace build-fix and improvement
Fix build error due to stacktrace API change. Now save_stack_trace() tries to save all kernel context, including interrupts and exception. Also some asm code are changed a bit so that we can detect the end of current context easily. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/stacktrace.c')
-rw-r--r--arch/mips/kernel/stacktrace.c52
1 files changed, 23 insertions, 29 deletions
diff --git a/arch/mips/kernel/stacktrace.c b/arch/mips/kernel/stacktrace.c
index f851d0cc245f..676e6f69d24b 100644
--- a/arch/mips/kernel/stacktrace.c
+++ b/arch/mips/kernel/stacktrace.c
@@ -13,7 +13,7 @@
* Save stack-backtrace addresses into a stack_trace buffer:
*/
static void save_raw_context_stack(struct stack_trace *trace,
- unsigned int skip, unsigned long reg29)
+ unsigned long reg29)
{
unsigned long *sp = (unsigned long *)reg29;
unsigned long addr;
@@ -21,10 +21,10 @@ static void save_raw_context_stack(struct stack_trace *trace,
while (!kstack_end(sp)) {
addr = *sp++;
if (__kernel_text_address(addr)) {
- if (!skip)
- trace->entries[trace->nr_entries++] = addr;
+ if (trace->skip > 0)
+ trace->skip--;
else
- skip--;
+ trace->entries[trace->nr_entries++] = addr;
if (trace->nr_entries >= trace->max_entries)
break;
}
@@ -32,37 +32,40 @@ static void save_raw_context_stack(struct stack_trace *trace,
}
static struct pt_regs * save_context_stack(struct stack_trace *trace,
- unsigned int skip, struct task_struct *task, struct pt_regs *regs)
+ struct task_struct *task, struct pt_regs *regs)
{
unsigned long sp = regs->regs[29];
#ifdef CONFIG_KALLSYMS
unsigned long ra = regs->regs[31];
unsigned long pc = regs->cp0_epc;
+ unsigned long stack_page =
+ (unsigned long)task_stack_page(task);
extern void ret_from_irq(void);
+ extern void ret_from_exception(void);
if (raw_show_trace || !__kernel_text_address(pc)) {
- save_raw_context_stack(trace, skip, sp);
+ if (stack_page && sp >= stack_page &&
+ sp <= stack_page + THREAD_SIZE - 32)
+ save_raw_context_stack(trace, sp);
return NULL;
}
do {
- if (!skip)
- trace->entries[trace->nr_entries++] = pc;
+ if (trace->skip > 0)
+ trace->skip--;
else
- skip--;
+ trace->entries[trace->nr_entries++] = pc;
if (trace->nr_entries >= trace->max_entries)
break;
/*
* If we reached the bottom of interrupt context,
* return saved pt_regs.
*/
- if (pc == (unsigned long)ret_from_irq) {
- unsigned long stack_page =
- (unsigned long)task_stack_page(task);
- if (!stack_page ||
- sp < stack_page ||
- sp > stack_page + THREAD_SIZE - 32)
- break;
- return (struct pt_regs *)sp;
+ if (pc == (unsigned long)ret_from_irq ||
+ pc == (unsigned long)ret_from_exception) {
+ if (stack_page && sp >= stack_page &&
+ sp <= stack_page + THREAD_SIZE - 32)
+ return (struct pt_regs *)sp;
+ break;
}
pc = unwind_stack(task, &sp, pc, ra);
ra = 0;
@@ -76,12 +79,8 @@ static struct pt_regs * save_context_stack(struct stack_trace *trace,
/*
* Save stack-backtrace addresses into a stack_trace buffer.
- * If all_contexts is set, all contexts (hardirq, softirq and process)
- * are saved. If not set then only the current context is saved.
*/
-void save_stack_trace(struct stack_trace *trace,
- struct task_struct *task, int all_contexts,
- unsigned int skip)
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
{
struct pt_regs dummyregs;
struct pt_regs *regs = &dummyregs;
@@ -99,13 +98,8 @@ void save_stack_trace(struct stack_trace *trace,
}
while (1) {
- regs = save_context_stack(trace, skip, task, regs);
- if (!all_contexts || !regs ||
- trace->nr_entries >= trace->max_entries)
- break;
- trace->entries[trace->nr_entries++] = ULONG_MAX;
- if (trace->nr_entries >= trace->max_entries)
+ regs = save_context_stack(trace, task, regs);
+ if (!regs || trace->nr_entries >= trace->max_entries)
break;
- skip = 0;
}
}