xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[ARM] 5382/1: unwind: Reorganise the stacktrace support

Browse Source 
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>
This commit is contained in:
Catalin Marinas
2009-02-11 13:07:53 +01:00
committed by Russell King
parent 67a94c23bb
commit 2d7c11bfc9
7 changed files with 109 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
arch/arm/kernel/process.c
View File

@@ -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;
}