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| author | Vineet Gupta <vgupta@synopsys.com> | 2020-11-06 17:37:34 -0800 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2020-11-17 20:12:01 -0800 |
| commit | f737561c709667013d832316dd3198a7fe3d1260 (patch) | |
| tree | 65ed7f728109a8abf3eee310a0190a908daf9689 | |
| parent | e42404fa10fd11fe72d0a0e149a321d10e577715 (diff) | |
| download | linux-f737561c709667013d832316dd3198a7fe3d1260.tar.gz linux-f737561c709667013d832316dd3198a7fe3d1260.tar.bz2 linux-f737561c709667013d832316dd3198a7fe3d1260.zip | |
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>
| -rw-r--r-- | arch/arc/kernel/stacktrace.c | 37 |
1 files changed, 18 insertions, 19 deletions
diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c index b2557f581ea8..f73da203b170 100644 --- a/arch/arc/kernel/stacktrace.c +++ b/arch/arc/kernel/stacktrace.c @@ -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; } |