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ARC: Make arc_unwind_core accessible externally

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The arc unwinder can also be used for perf callchains.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2013-07-10 16:03:45 +02:00
parent c517d838eb
commit 3a51d50f42
2 changed files with 51 additions and 1 deletions
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15
arch/arc/kernel/stacktrace.c
View file

@ -43,6 +43,10 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
struct pt_regs *regs,
struct unwind_frame_info *frame_info)
{
/*
* synchronous unwinding (e.g. dump_stack)
* - uses current values of SP and friends
*/
if (tsk == NULL && regs == NULL) {
unsigned long fp, sp, blink, ret;
frame_info->task = current;
@ -61,6 +65,11 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
frame_info->regs.r63 = ret;
frame_info->call_frame = 0;
} else if (regs == NULL) {
/*
* Asynchronous unwinding of sleeping task
* - Gets SP etc from task's pt_regs (saved bottom of kernel
* mode stack of task)
*/
frame_info->task = tsk;
@ -83,6 +92,10 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
frame_info->call_frame = 0;
} else {
/*
* Asynchronous unwinding of intr/exception
* - Just uses the pt_regs passed
*/
frame_info->task = tsk;
frame_info->regs.r27 = regs->fp;
@ -95,7 +108,7 @@ static void seed_unwind_frame_info(struct task_struct *tsk,
#endif
static noinline unsigned int
notrace noinline unsigned int
arc_unwind_core(struct task_struct *tsk, struct pt_regs *regs,
int (*consumer_fn) (unsigned int, void *), void *arg)
{