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    Subject[patch v3 34/36] Hexagon: Add basic stacktrace functionality for Hexagon architecture.
    Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
    Acked-by: Arnd Bergmann <arnd@arndb.de>

    ---
    arch/hexagon/kernel/stacktrace.c | 66 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 66 insertions(+)

    Index: linux-hexagon-kernel/arch/hexagon/kernel/stacktrace.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-hexagon-kernel/arch/hexagon/kernel/stacktrace.c 2011-09-07 13:00:31.140647106 -0500
    @@ -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);
    --

    Sent by an employee of the Qualcomm Innovation Center, Inc.
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.



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