LXR linux/arch/cris/include/arch-v10/arch/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
  19struct 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
  67