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Tip revision: 28a33cbc24e4256c143dce96c7d93bf423229f92 authored by Linus Torvalds on 21 July 2012, 20:58:29 UTC
Linux 3.5
Linux 3.5
Tip revision: 28a33cb
stacktrace.c
/*
* Stack trace management functions
*
* Copyright (C) 2009 Helge Deller <deller@gmx.de>
* based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
* and parisc unwind functions by Randolph Chung <tausq@debian.org>
*
* TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
*/
#include <linux/module.h>
#include <linux/stacktrace.h>
#include <asm/unwind.h>
static void dump_trace(struct task_struct *task, struct stack_trace *trace)
{
struct unwind_frame_info info;
/* initialize unwind info */
if (task == current) {
unsigned long sp;
struct pt_regs r;
HERE:
asm volatile ("copy %%r30, %0" : "=r"(sp));
memset(&r, 0, sizeof(struct pt_regs));
r.iaoq[0] = (unsigned long)&&HERE;
r.gr[2] = (unsigned long)__builtin_return_address(0);
r.gr[30] = sp;
unwind_frame_init(&info, task, &r);
} else {
unwind_frame_init_from_blocked_task(&info, task);
}
/* unwind stack and save entries in stack_trace struct */
trace->nr_entries = 0;
while (trace->nr_entries < trace->max_entries) {
if (unwind_once(&info) < 0 || info.ip == 0)
break;
if (__kernel_text_address(info.ip))
trace->entries[trace->nr_entries++] = info.ip;
}
}
/*
* Save stack-backtrace addresses into a stack_trace buffer.
*/
void save_stack_trace(struct stack_trace *trace)
{
dump_trace(current, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
dump_trace(tsk, trace);
if (trace->nr_entries < trace->max_entries)
trace->entries[trace->nr_entries++] = ULONG_MAX;
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);