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Linux/arch/arm/kernel/return_address.c

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  1 /*
  2  * arch/arm/kernel/return_address.c
  3  *
  4  * Copyright (C) 2009 Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
  5  * for Pengutronix
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License version 2 as published by
  9  * the Free Software Foundation.
 10  */
 11 #include <linux/export.h>
 12 #include <linux/ftrace.h>
 13 
 14 #if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND)
 15 #include <linux/sched.h>
 16 
 17 #include <asm/stacktrace.h>
 18 
 19 struct return_address_data {
 20         unsigned int level;
 21         void *addr;
 22 };
 23 
 24 static int save_return_addr(struct stackframe *frame, void *d)
 25 {
 26         struct return_address_data *data = d;
 27 
 28         if (!data->level) {
 29                 data->addr = (void *)frame->pc;
 30 
 31                 return 1;
 32         } else {
 33                 --data->level;
 34                 return 0;
 35         }
 36 }
 37 
 38 void *return_address(unsigned int level)
 39 {
 40         struct return_address_data data;
 41         struct stackframe frame;
 42 
 43         data.level = level + 2;
 44         data.addr = NULL;
 45 
 46         frame.fp = (unsigned long)__builtin_frame_address(0);
 47         frame.sp = current_stack_pointer;
 48         frame.lr = (unsigned long)__builtin_return_address(0);
 49         frame.pc = (unsigned long)return_address;
 50 
 51         walk_stackframe(&frame, save_return_addr, &data);
 52 
 53         if (!data.level)
 54                 return data.addr;
 55         else
 56                 return NULL;
 57 }
 58 
 59 #endif /* if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) */
 60 
 61 EXPORT_SYMBOL_GPL(return_address);
 62 

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