Hexagon: Add basic stacktrace functionality for Hexagon architecture.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Signed-off-by: Linas Vepstas <linas@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/hexagon/kernel/stacktrace.c b/arch/hexagon/kernel/stacktrace.c
new file mode 100644 (file)
index 0000000..11c597b
--- /dev/null
+++ b/arch/hexagon/kernel/stacktrace.c
@@ -0,0 +1,66 @@
+/*
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * 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) {
+                       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);