87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
|
/*
|
||
|
|
* Stack trace utility for OpenRISC
|
||
|
|
*
|
||
|
|
* Copyright (C) 2017 Stafford Horne <shorne@gmail.com>
|
||
|
|
*
|
||
|
|
* This file is licensed under the terms of the GNU General Public License
|
||
|
|
* version 2. This program is licensed "as is" without any warranty of any
|
||
|
|
* kind, whether express or implied.
|
||
|
|
*
|
||
|
|
* Losely based on work from sh and powerpc.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/sched/debug.h>
|
||
|
|
#include <linux/stacktrace.h>
|
||
|
|
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/unwinder.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;
|
||
|
|
}
|
||
|
|
|
||
|
|
void save_stack_trace(struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
unwind_stack(trace, (unsigned long *) &trace, save_stack_address);
|
||
|
|
}
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
unsigned long *sp = NULL;
|
||
|
|
|
||
|
|
if (tsk == current)
|
||
|
|
sp = (unsigned long *) &sp;
|
||
|
|
else
|
||
|
|
sp = (unsigned long *) KSTK_ESP(tsk);
|
||
|
|
|
||
|
|
unwind_stack(trace, sp, save_stack_address_nosched);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|
||
|
|
|
||
|
|
void
|
||
|
|
save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
|
||
|
|
{
|
||
|
|
unwind_stack(trace, (unsigned long *) regs->sp,
|
||
|
|
save_stack_address_nosched);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_regs);
|