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/**
* Copyright (C) ARM Limited 2010-2011. 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 as
* published by the Free Software Foundation.
*
*/
/*
* EABI backtrace stores {fp,lr} on the stack.
*/
struct frame_tail_eabi {
unsigned long fp; // points to prev_lr
unsigned long lr;
};
static void arm_backtrace_eabi(int cpu, struct pt_regs * const regs, unsigned int depth)
{
#if defined(__arm__)
struct frame_tail_eabi *tail;
struct frame_tail_eabi *next;
struct frame_tail_eabi *ptrtail;
struct frame_tail_eabi buftail;
unsigned long fp = regs->ARM_fp;
unsigned long lr = regs->ARM_lr;
int is_user_mode = user_mode(regs);
if (!is_user_mode) {
return;
}
/* entry preamble may not have executed */
gator_add_trace(cpu, lr);
/* check tail is valid */
if (fp == 0) {
return;
}
tail = (struct frame_tail_eabi *)(fp - 4);
while (depth-- && tail && !((unsigned long) tail & 3)) {
/* Also check accessibility of one struct frame_tail beyond */
if (!access_ok(VERIFY_READ, tail, sizeof(struct frame_tail_eabi)))
return;
if (__copy_from_user_inatomic(&buftail, tail, sizeof(struct frame_tail_eabi)))
return;
ptrtail = &buftail;
lr = ptrtail[0].lr;
gator_add_trace(cpu, lr);
/* frame pointers should progress back up the stack, towards higher addresses */
next = (struct frame_tail_eabi *)(lr - 4);
if (tail >= next || lr == 0) {
fp = ptrtail[0].fp;
next = (struct frame_tail_eabi *)(fp - 4);
/* check tail is valid */
if (tail >= next || fp == 0) {
return;
}
}
tail = next;
}
#endif
}
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