80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* arch/sh/kernel/stacktrace.c
|
||
|
|
*
|
||
|
|
* Stack trace management functions
|
||
|
|
*
|
||
|
|
* Copyright (C) 2006 - 2008 Paul Mundt
|
||
|
|
*/
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/sched/debug.h>
|
||
|
|
#include <linux/stacktrace.h>
|
||
|
|
#include <linux/thread_info.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <asm/unwinder.h>
|
||
|
|
#include <asm/ptrace.h>
|
||
|
|
#include <asm/stacktrace.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
||
|
|
*/
|
||
|
|
static void save_stack_address(void *data, unsigned long addr, int reliable)
|
||
|
|
{
|
||
|
|
struct stack_trace *trace = data;
|
||
|
|
|
||
|
|
if (!reliable)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (trace->skip > 0) {
|
||
|
|
trace->skip--;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (trace->nr_entries < trace->max_entries)
|
||
|
|
trace->entries[trace->nr_entries++] = addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct stacktrace_ops save_stack_ops = {
|
||
|
|
.address = save_stack_address,
|
||
|
|
};
|
||
|
|
|
||
|
|
void save_stack_trace(struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
unsigned long *sp = (unsigned long *)current_stack_pointer;
|
||
|
|
|
||
|
|
unwind_stack(current, NULL, sp, &save_stack_ops, trace);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
||
|
|
|
||
|
|
static void
|
||
|
|
save_stack_address_nosched(void *data, unsigned long addr, int reliable)
|
||
|
|
{
|
||
|
|
struct stack_trace *trace = (struct stack_trace *)data;
|
||
|
|
|
||
|
|
if (!reliable)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (in_sched_functions(addr))
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (trace->skip > 0) {
|
||
|
|
trace->skip--;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (trace->nr_entries < trace->max_entries)
|
||
|
|
trace->entries[trace->nr_entries++] = addr;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct stacktrace_ops save_stack_ops_nosched = {
|
||
|
|
.address = save_stack_address_nosched,
|
||
|
|
};
|
||
|
|
|
||
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
unsigned long *sp = (unsigned long *)tsk->thread.sp;
|
||
|
|
|
||
|
|
unwind_stack(current, NULL, sp, &save_stack_ops_nosched, trace);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|