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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-11-23 20:01:59 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2007-12-07 14:52:36 +0100
commit2f0260371f428fd78ffc2287a5c5768ea8eeab97 (patch)
tree7e9da0354fa88da8d4113267b04fba3ba337d3ec /arch/avr32/kernel/stacktrace.c
parent58bd2bfebd02ff7fe84bbb36188e908223b2c7b7 (diff)
[AVR32] Implement stacktrace support
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/kernel/stacktrace.c')
-rw-r--r--arch/avr32/kernel/stacktrace.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/avr32/kernel/stacktrace.c b/arch/avr32/kernel/stacktrace.c
new file mode 100644
index 00000000000..9a68190bbff
--- /dev/null
+++ b/arch/avr32/kernel/stacktrace.c
@@ -0,0 +1,53 @@
+/*
+ * 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;
+ }
+}