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/* -*- linux-c -*-
* x86_64 stack tracing functions
* 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
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
// 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 addr;
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);
}
}
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