diff options
Diffstat (limited to 'arch/arm64/kernel/stacktrace.c')
| -rw-r--r-- | arch/arm64/kernel/stacktrace.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index 804d076b02cb..fa56af1a59c3 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -132,6 +132,71 @@ void notrace walk_stackframe(struct task_struct *tsk, struct stackframe *frame, } NOKPROBE_SYMBOL(walk_stackframe); +static void dump_backtrace_entry(unsigned long where, const char *loglvl) +{ + printk("%s %pS\n", loglvl, (void *)where); +} + +void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk, + const char *loglvl) +{ + struct stackframe frame; + int skip = 0; + + pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk); + + if (regs) { + if (user_mode(regs)) + return; + skip = 1; + } + + if (!tsk) + tsk = current; + + if (!try_get_task_stack(tsk)) + return; + + if (tsk == current) { + start_backtrace(&frame, + (unsigned long)__builtin_frame_address(0), + (unsigned long)dump_backtrace); + } else { + /* + * task blocked in __switch_to + */ + start_backtrace(&frame, + thread_saved_fp(tsk), + thread_saved_pc(tsk)); + } + + printk("%sCall trace:\n", loglvl); + do { + /* skip until specified stack frame */ + if (!skip) { + dump_backtrace_entry(frame.pc, loglvl); + } else if (frame.fp == regs->regs[29]) { + skip = 0; + /* + * Mostly, this is the case where this function is + * called in panic/abort. As exception handler's + * stack frame does not contain the corresponding pc + * at which an exception has taken place, use regs->pc + * instead. + */ + dump_backtrace_entry(regs->pc, loglvl); + } + } while (!unwind_frame(tsk, &frame)); + + put_task_stack(tsk); +} + +void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl) +{ + dump_backtrace(NULL, tsk, loglvl); + barrier(); +} + #ifdef CONFIG_STACKTRACE void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, |