diff options
author | Richard Kuo | 2011-10-31 18:56:19 -0500 |
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committer | Linus Torvalds | 2011-11-01 07:34:21 -0700 |
commit | 74d04d6ffd39274457eafa15022ab717e40cbc63 (patch) | |
tree | f700ed0d1a1581bf3943d449307c1f796794b269 /arch/hexagon | |
parent | e95bf452a9e22bd1c9ae23fea041989e0603c39d (diff) |
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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon')
-rw-r--r-- | arch/hexagon/kernel/stacktrace.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/hexagon/kernel/stacktrace.c b/arch/hexagon/kernel/stacktrace.c new file mode 100644 index 000000000000..11c597b2ac59 --- /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); |