[AVR32] Implement stacktrace support (2f026037) · Commits · e / devices / android_kernel_sony_msm8994

arch/avr32/Kconfig

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	@@ -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-y += init_task.o switch_to.o cpu.o
	obj-$(CONFIG_MODULES) += module.o avr32_ksyms.o		obj-$(CONFIG_MODULES) += module.o avr32_ksyms.o
	obj-$(CONFIG_KPROBES) += kprobes.o		obj-$(CONFIG_KPROBES) += kprobes.o
			obj-$(CONFIG_STACKTRACE) += stacktrace.o

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			/*
			* 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;
			}
			}