aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/kernel/process.c
diff options
context:
space:
mode:
authorCatalin Marinas <catalin.marinas@arm.com>2009-02-11 13:07:53 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2009-02-12 13:21:17 +0000
commit2d7c11bfc91637e5f9bc5f8c9a82aaffcc0e97aa (patch)
tree0bb67dae38b1185089b6c9813769689cb79c5ee3 /arch/arm/kernel/process.c
parent67a94c23bb7338c321ae71aa33f8d398c94e1d0c (diff)
[ARM] 5382/1: unwind: Reorganise the stacktrace support
This patch changes the walk_stacktrace and its callers for easier integration of stack unwinding. The arch/arm/kernel/stacktrace.h file is also moved to arch/arm/include/asm/stacktrace.h. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/process.c')
-rw-r--r--arch/arm/kernel/process.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index d3ea6fa8952..af377c73d90 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -34,6 +34,7 @@
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/thread_notify.h>
+#include <asm/stacktrace.h>
#include <asm/mach/time.h>
static const char *processor_modes[] = {
@@ -372,23 +373,21 @@ EXPORT_SYMBOL(kernel_thread);
unsigned long get_wchan(struct task_struct *p)
{
- unsigned long fp, lr;
- unsigned long stack_start, stack_end;
+ struct stackframe frame;
int count = 0;
if (!p || p == current || p->state == TASK_RUNNING)
return 0;
- stack_start = (unsigned long)end_of_stack(p);
- stack_end = (unsigned long)task_stack_page(p) + THREAD_SIZE;
-
- fp = thread_saved_fp(p);
+ frame.fp = thread_saved_fp(p);
+ frame.sp = thread_saved_sp(p);
+ frame.lr = 0; /* recovered from the stack */
+ frame.pc = thread_saved_pc(p);
do {
- if (fp < stack_start || fp > stack_end)
+ int ret = unwind_frame(&frame);
+ if (ret < 0)
return 0;
- lr = ((unsigned long *)fp)[-1];
- if (!in_sched_functions(lr))
- return lr;
- fp = *(unsigned long *) (fp - 12);
+ if (!in_sched_functions(frame.pc))
+ return frame.pc;
} while (count ++ < 16);
return 0;
}