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ARC: stack unwinding: reorganize how initial register state setup 

This is a non-functional change, if anything a better fall-back
handling.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2020-11-06 17:37:34 -08:00
parent e42404fa10
commit f737561c70
1 changed files with 18 additions and 19 deletions
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37
arch/arc/kernel/stacktrace.c
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@ -42,11 +42,23 @@ static int
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 (regs == NULL && (tsk == NULL || tsk == current)) {
if (regs) {
/*
* Asynchronous unwinding of intr/exception
* - Just uses the pt_regs passed
*/
frame_info->task = tsk;
frame_info->regs.r27 = regs->fp;
frame_info->regs.r28 = regs->sp;
frame_info->regs.r31 = regs->blink;
frame_info->regs.r63 = regs->ret;
frame_info->call_frame = 0;
} else if (tsk == NULL || tsk == current) {
/*
* synchronous unwinding (e.g. dump_stack)
* - uses current values of SP and friends
*/
unsigned long fp, sp, blink, ret;
frame_info->task = current;
@ -63,7 +75,7 @@ seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs,
frame_info->regs.r31 = blink;
frame_info->regs.r63 = ret;
frame_info->call_frame = 0;
} else if (regs == NULL) {
} else {
/*
* Asynchronous unwinding of a likely sleeping task
* - first ensure it is actually sleeping
@ -94,20 +106,7 @@ seed_unwind_frame_info(struct task_struct *tsk, struct pt_regs *regs,
frame_info->regs.r28 += 60;
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;
frame_info->regs.r28 = regs->sp;
frame_info->regs.r31 = regs->blink;
frame_info->regs.r63 = regs->ret;
frame_info->call_frame = 0;
}
return 0;
}