55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Stacktrace support for Hexagon
|
|
*
|
|
* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/thread_info.h>
|
|
#include <linux/module.h>
|
|
|
|
register unsigned long current_frame_pointer asm("r30");
|
|
|
|
struct stackframe {
|
|
unsigned long fp;
|
|
unsigned long rets;
|
|
};
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
|
*/
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
unsigned long low, high;
|
|
unsigned long fp;
|
|
struct stackframe *frame;
|
|
int skip = trace->skip;
|
|
|
|
low = (unsigned long)task_stack_page(current);
|
|
high = low + THREAD_SIZE;
|
|
fp = current_frame_pointer;
|
|
|
|
while (fp >= low && fp <= (high - sizeof(*frame))) {
|
|
frame = (struct stackframe *)fp;
|
|
|
|
if (skip) {
|
|
skip--;
|
|
} else {
|
|
trace->entries[trace->nr_entries++] = frame->rets;
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The next frame must be at a higher address than the
|
|
* current frame.
|
|
*/
|
|
low = fp + sizeof(*frame);
|
|
fp = frame->fp;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|