diff options
Diffstat (limited to 'runtime/stack-x86_64.c')
| -rw-r--r-- | runtime/stack-x86_64.c | 37 |
1 files changed, 31 insertions, 6 deletions
diff --git a/runtime/stack-x86_64.c b/runtime/stack-x86_64.c index 186b2ad4..3ba99201 100644 --- a/runtime/stack-x86_64.c +++ b/runtime/stack-x86_64.c @@ -1,6 +1,6 @@ /* -*- linux-c -*- * x86_64 stack tracing functions - * Copyright (C) 2005, 2006, 2007 Red Hat Inc. + * Copyright (C) 2005-2008 Red Hat Inc. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General @@ -8,13 +8,38 @@ * later version. */ -static void __stp_stack_print (struct pt_regs *regs, int verbose, int levels) +// todo: don't use unwinder for kernel if CONFIG_FRAME + +/* DWARF unwinder failed. Just dump intereting addresses on kernel stack. */ +static void _stp_stack_print_fallback(unsigned long stack, int verbose) { - unsigned long *stack = (unsigned long *)REG_SP(regs); unsigned long addr; - while ((long)stack & (THREAD_SIZE-1)) { - addr = *stack++; - _stp_func_print(addr, verbose, 1); + while (stack & (THREAD_SIZE - 1)) { + if (unlikely(__stp_get_user(addr, (unsigned long *)stack))) { + /* cannot access stack. give up. */ + return; + } + _stp_func_print(addr, verbose, 0); + stack++; + } +} + +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); + + /* we haven't actually executed the instruction at the IP yet. */ + UNW_PC(&info) -= 1; + + while (!arch_unw_user_mode(&info)) { + int ret = unwind(&info); + dbug_unwind(1, "ret=%d PC=%lx\n", ret, UNW_PC(&info)); + if (ret < 0) { + _stp_stack_print_fallback(UNW_SP(&info), verbose); + break; + } + _stp_func_print(UNW_PC(&info), verbose, 1); } } |