include/asm-cris/arch-v10/bug.h

   1 #ifndef __ASM_CRISv10_ARCH_BUG_H
   2 #define __ASM_CRISv10_ARCH_BUG_H
   3
   4 #include <linux/stringify.h>
   5
   6 #ifdef CONFIG_BUG
   7 #ifdef CONFIG_DEBUG_BUGVERBOSE
   8 /* The BUG() macro is used for marking obviously incorrect code paths.
   9  * It will cause a message with the file name and line number to be printed,
  10  * and then cause an oops.  The message is actually printed by handle_BUG()
  11  * in arch/cris/kernel/traps.c, and the reason we use this method of storing
  12  * the file name and line number is that we do not want to affect the registers
  13  * by calling printk() before causing the oops.
  14  */
  15
  16 #define BUG_PREFIX 0x0D7F
  17 #define BUG_MAGIC  0x00001234
  18
  19 struct bug_frame {
  20         unsigned short prefix;
  21         unsigned int magic;
  22         unsigned short clear;
  23         unsigned short movu;
  24         unsigned short line;
  25         unsigned short jump;
  26         unsigned char *filename;
  27 };
  28
  29 #if 0
  30 /* Unfortunately this version of the macro does not work due to a problem
  31  * with the compiler (aka a bug) when compiling with -O2, which sometimes
  32  * erroneously causes the second input to be stored in a register...
  33  */
  34 #define BUG()                                                           \
  35         __asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
  36                                 "movu.w %0,$r0\n\t"                     \
  37                                 "jump %1\n\t"                           \
  38                                 : : "i" (__LINE__), "i" (__FILE__))
  39 #else
  40 /* This version will have to do for now, until the compiler is fixed.
  41  * The drawbacks of this version are that the file name will appear multiple
  42  * times in the .rodata section, and that __LINE__ and __FILE__ can probably
  43  * not be used like this with newer versions of gcc.
  44  */
  45 #define BUG()                                                           \
  46         __asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
  47                               "movu.w " __stringify(__LINE__) ",$r0\n\t"\
  48                               "jump 0f\n\t"                             \
  49                               ".section .rodata\n"                      \
  50                               "0:\t.string \"" __FILE__ "\"\n\t"        \
  51                               ".previous")
  52 #endif
  53
  54 #else
  55
  56 /* This just causes an oops. */
  57 #define BUG() (*(int *)0 = 0)
  58
  59 #endif
  60
  61 #define HAVE_ARCH_BUG
  62 #endif
  63
  64 #include <asm-generic/bug.h>
  65
  66 #endif