| Jesper Nilsson | 0dfb8c3 | 2008-01-17 10:42:58 +0100 | [diff] [blame] | 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 |
