arch/blackfin/include/asm/ftrace.h

   1 /*
   2  * Blackfin ftrace code
   3  *
   4  * Copyright 2009 Analog Devices Inc.
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #ifndef __ASM_BFIN_FTRACE_H__
   9 #define __ASM_BFIN_FTRACE_H__
  10
  11 #define MCOUNT_INSN_SIZE        6 /* sizeof "[++sp] = rets; call __mcount;" */
  12
  13 #ifndef __ASSEMBLY__
  14
  15 #ifdef CONFIG_FRAME_POINTER
  16 #include <linux/mm.h>
  17
  18 extern inline void *return_address(unsigned int level)
  19 {
  20         unsigned long *endstack, *fp, *ret_addr;
  21         unsigned int current_level = 0;
  22
  23         if (level == 0)
  24                 return __builtin_return_address(0);
  25
  26         fp = (unsigned long *)__builtin_frame_address(0);
  27         endstack = (unsigned long *)PAGE_ALIGN((unsigned long)&level);
  28
  29         while (((unsigned long)fp & 0x3) == 0 && fp &&
  30                (fp + 1) < endstack && current_level < level) {
  31                 fp = (unsigned long *)*fp;
  32                 current_level++;
  33         }
  34
  35         if (((unsigned long)fp & 0x3) == 0 && fp &&
  36             (fp + 1) < endstack)
  37                 ret_addr = (unsigned long *)*(fp + 1);
  38         else
  39                 ret_addr = NULL;
  40
  41         return ret_addr;
  42 }
  43
  44 #else
  45
  46 extern inline void *return_address(unsigned int level)
  47 {
  48         return NULL;
  49 }
  50
  51 #endif /* CONFIG_FRAME_POINTER */
  52
  53 #define HAVE_ARCH_CALLER_ADDR
  54
  55 /* inline function or macro may lead to unexpected result */
  56 #define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
  57 #define CALLER_ADDR1 ((unsigned long)return_address(1))
  58 #define CALLER_ADDR2 ((unsigned long)return_address(2))
  59 #define CALLER_ADDR3 ((unsigned long)return_address(3))
  60 #define CALLER_ADDR4 ((unsigned long)return_address(4))
  61 #define CALLER_ADDR5 ((unsigned long)return_address(5))
  62 #define CALLER_ADDR6 ((unsigned long)return_address(6))
  63
  64 #endif /* __ASSEMBLY__ */
  65
  66 #endif