linux-imx

/*

 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)

 * Copyright (C) 2013 Richard Weinberger <richard@nod.at>

 * Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com>

 *

 * 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/kallsyms.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/stacktrace.h>

#include <linux/module.h>

#include <linux/uaccess.h>

#include <asm/stacktrace.h>

​

void dump_trace(struct task_struct *tsk,

        const struct stacktrace_ops *ops,

        void *data)

{

    int reliable = 0;

    unsigned long *sp, bp, addr;

    struct pt_regs *segv_regs = tsk->thread.segv_regs;

    struct stack_frame *frame;

​

    bp = get_frame_pointer(tsk, segv_regs);

    sp = get_stack_pointer(tsk, segv_regs);

​

    frame = (struct stack_frame *)bp;

    while (((long) sp & (THREAD_SIZE-1)) != 0) {

        addr = *sp;

        if (__kernel_text_address(addr)) {

            reliable = 0;

            if ((unsigned long) sp == bp + sizeof(long)) {

                frame = frame ? frame->next_frame : NULL;

                bp = (unsigned long)frame;

                reliable = 1;

            }

            ops->address(data, addr, reliable);

        }

        sp++;

    }

}

​

static void save_addr(void *data, unsigned long address, int reliable)

{

    struct stack_trace *trace = data;

​

    if (!reliable)

        return;

    if (trace->nr_entries >= trace->max_entries)

        return;

​

    trace->entries[trace->nr_entries++] = address;

}

​

static const struct stacktrace_ops dump_ops = {

    .address = save_addr

};

​

static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace)