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/* -*- linux-c -*-
* i386 stack tracing functions
* Copyright (C) 2005, 2006, 2007 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.
*/
#ifdef CONFIG_STACK_UNWIND
#include <linux/unwind.h>
static inline int _stp_valid_stack_ptr_info(struct unwind_frame_info *info)
{
unsigned long context = (unsigned long)UNW_SP(info) & ~(THREAD_SIZE - 1);
unsigned long p = UNW_PC(info);
return p > context && p < context + THREAD_SIZE - 3;
}
static int
_stp_show_trace_unwind(struct unwind_frame_info *info, int verbose)
{
int n = 0;
while (unwind(info) == 0 && UNW_PC(info)) {
if (_stp_valid_stack_ptr_info(info))
break;
n++;
if (verbose) {
_stp_print_char (' ');
_stp_symbol_print (UNW_PC(info));
_stp_print_char ('\n');
} else
_stp_printf ("0x%08lx ", UNW_PC(info));
if (arch_unw_user_mode(info))
break;
}
return n;
}
#endif /* CONFIG_STACK_UNWIND */
static inline int _stp_valid_stack_ptr(unsigned long context, unsigned long p)
{
return p > context && p < context + THREAD_SIZE - 3;
}
static void __stp_stack_print (struct pt_regs *regs, int verbose, int levels)
{
unsigned long *stack = (unsigned long *)®_SP(regs);
unsigned long context = (unsigned long)stack & ~(THREAD_SIZE - 1);
unsigned long addr;
int uw_ret = 0;
#ifdef CONFIG_STACK_UNWIND
struct unwind_frame_info info;
if (unwind_init_frame_info(&info, current, regs) == 0)
uw_ret = _stp_show_trace_unwind(&info, verbose);
stack = (void *)UNW_SP(&info);
#endif
if (uw_ret == 0)
_stp_print("Inexact backtrace:\n");
#ifdef CONFIG_FRAME_POINTER
{
unsigned long ebp;
/* Grab ebp right from our regs.*/
asm ("movl %%ebp, %0" : "=r" (ebp) : );
while (_stp_valid_stack_ptr(context, (unsigned long)ebp)) {
addr = *(unsigned long *)(ebp + 4);
if (verbose) {
if (uw_ret) {
uw_ret = 0;
_stp_print("Leftover inexact backtrace:\n");
}
_stp_print_char(' ');
_stp_symbol_print (addr);
_stp_print_char('\n');
} else
_stp_printf ("0x%08lx ", addr);
ebp = *(unsigned long *)ebp;
}
}
#else
while (_stp_valid_stack_ptr(context, (unsigned long)stack)) {
addr = *stack++;
if (_stp_kta(addr)) {
if (verbose) {
if (uw_ret) {
uw_ret = 0;
_stp_print("Leftover inexact backtrace:\n");
}
_stp_print_char(' ');
_stp_symbol_print(addr);
_stp_print_char('\n');
} else
_stp_printf ("0x%08lx ", addr);
}
}
#endif
}
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