diff options
Diffstat (limited to 'runtime/stack-x86_64.c')
| -rw-r--r-- | runtime/stack-x86_64.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/runtime/stack-x86_64.c b/runtime/stack-x86_64.c index c3b171ea..729b8a2a 100644 --- a/runtime/stack-x86_64.c +++ b/runtime/stack-x86_64.c @@ -9,16 +9,16 @@ */ /* DWARF unwinder failed. Just dump intereting addresses on kernel stack. */ -static void _stp_stack_print_fallback(unsigned long stack, int verbose) +static void _stp_stack_print_fallback(unsigned long stack, int verbose, int levels) { unsigned long addr; - while (stack & (THREAD_SIZE - 1) && - !_stp_pbuf_full()) { + while (levels && stack & (THREAD_SIZE - 1)) { if (unlikely(_stp_read_address(addr, (unsigned long *)stack, KERNEL_DS))) { /* cannot access stack. give up. */ return; } - _stp_func_print(addr, verbose, 0); + if (_stp_func_print(addr, verbose, 0)) + levels--; stack++; } } @@ -30,17 +30,18 @@ static void __stp_stack_print(struct pt_regs *regs, int verbose, int levels) struct unwind_frame_info info; arch_unw_init_frame_info(&info, regs); - while (!arch_unw_user_mode(&info)) { + while (levels && !arch_unw_user_mode(&info)) { int ret = unwind(&info); dbug_unwind(1, "ret=%d PC=%lx SP=%lx\n", ret, UNW_PC(&info), UNW_SP(&info)); if (ret == 0) { _stp_func_print(UNW_PC(&info), verbose, 1); + levels--; continue; } /* If an error happened or we hit a kretprobe trampoline, use fallback backtrace */ /* FIXME: is there a way to unwind across kretprobe trampolines? */ if (ret < 0 || (ret > 0 && UNW_PC(&info) == _stp_kretprobe_trampoline)) - _stp_stack_print_fallback(UNW_SP(&info), verbose); + _stp_stack_print_fallback(UNW_SP(&info), verbose, levels); break; } #else /* ! STP_USE_DWARF_UNWINDER */ |