81 lines
2 KiB
C
81 lines
2 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
||
|
|
* Copyright (C) 2013 Richard Weinberger <richard@nod.at>
|
||
|
|
* Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kallsyms.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/stacktrace.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <asm/stacktrace.h>
|
||
|
|
|
||
|
|
void dump_trace(struct task_struct *tsk,
|
||
|
|
const struct stacktrace_ops *ops,
|
||
|
|
void *data)
|
||
|
|
{
|
||
|
|
int reliable = 0;
|
||
|
|
unsigned long *sp, bp, addr;
|
||
|
|
struct pt_regs *segv_regs = tsk->thread.segv_regs;
|
||
|
|
struct stack_frame *frame;
|
||
|
|
|
||
|
|
bp = get_frame_pointer(tsk, segv_regs);
|
||
|
|
sp = get_stack_pointer(tsk, segv_regs);
|
||
|
|
|
||
|
|
frame = (struct stack_frame *)bp;
|
||
|
|
while (((long) sp & (THREAD_SIZE-1)) != 0) {
|
||
|
|
addr = *sp;
|
||
|
|
if (__kernel_text_address(addr)) {
|
||
|
|
reliable = 0;
|
||
|
|
if ((unsigned long) sp == bp + sizeof(long)) {
|
||
|
|
frame = frame ? frame->next_frame : NULL;
|
||
|
|
bp = (unsigned long)frame;
|
||
|
|
reliable = 1;
|
||
|
|
}
|
||
|
|
ops->address(data, addr, reliable);
|
||
|
|
}
|
||
|
|
sp++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void save_addr(void *data, unsigned long address, int reliable)
|
||
|
|
{
|
||
|
|
struct stack_trace *trace = data;
|
||
|
|
|
||
|
|
if (!reliable)
|
||
|
|
return;
|
||
|
|
if (trace->nr_entries >= trace->max_entries)
|
||
|
|
return;
|
||
|
|
|
||
|
|
trace->entries[trace->nr_entries++] = address;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct stacktrace_ops dump_ops = {
|
||
|
|
.address = save_addr
|
||
|
|
};
|
||
|
|
|
||
|
|
static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
dump_trace(tsk, &dump_ops, trace);
|
||
|
|
if (trace->nr_entries < trace->max_entries)
|
||
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
||
|
|
}
|
||
|
|
|
||
|
|
void save_stack_trace(struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
__save_stack_trace(current, trace);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
||
|
|
|
||
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
__save_stack_trace(tsk, trace);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|