Commit 74d04d6f authored by Richard Kuo's avatar Richard Kuo Committed by Linus Torvalds
Browse files

Hexagon: Add basic stacktrace functionality for Hexagon architecture.

Signed-off-by: default avatarRichard Kuo <>
Signed-off-by: default avatarLinas Vepstas <>
Acked-by: default avatarArnd Bergmann <>
Signed-off-by: default avatarLinus Torvalds <>
parent e95bf452
* Stacktrace support for Hexagon
* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
#include <linux/sched.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) {
} else {
trace->entries[trace->nr_entries++] = frame->rets;
if (trace->nr_entries >= trace->max_entries)
* The next frame must be at a higher address than the
* current frame.
low = fp + sizeof(*frame);
fp = frame->fp;
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