Commit 2f026037 authored by Haavard Skinnemoen's avatar Haavard Skinnemoen
Browse files

[AVR32] Implement stacktrace support 



Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
parent 58bd2bfe

arch/avr32/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -24,6 +24,9 @@ config GENERIC_GPIO 
config GENERIC_HARDIRQS

	def_bool y



config STACKTRACE_SUPPORT

	def_bool y



config HARDIRQS_SW_RESEND

	def_bool y

arch/avr32/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,3 +11,4 @@ obj-y += signal.o sys_avr32.o process.o time.o 
obj-y				+= init_task.o switch_to.o cpu.o

obj-$(CONFIG_MODULES)		+= module.o avr32_ksyms.o

obj-$(CONFIG_KPROBES)		+= kprobes.o

obj-$(CONFIG_STACKTRACE)	+= stacktrace.o

arch/avr32/kernel/stacktrace.c

0 → 100644
+53 −0
Original line number Diff line number Diff line 
/*

 * Stack trace management functions

 *

 * Copyright (C) 2007 Atmel Corporation

 *

 * 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/sched.h>

#include <linux/stacktrace.h>

#include <linux/thread_info.h>



register unsigned long current_frame_pointer asm("r7");



struct stackframe {

	unsigned long lr;

	unsigned long fp;

};



/*

 * 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 - 8)) {

		frame = (struct stackframe *)fp;



		if (skip) {

			skip--;

		} else {

			trace->entries[trace->nr_entries++] = frame->lr;

			if (trace->nr_entries >= trace->max_entries)

				break;

		}



		/*

		 * The next frame must be at a higher address than the

		 * current frame.

		 */

		low = fp + 8;

		fp = frame->fp;

	}

}