diff options
| -rw-r--r-- | include/asm-cris/arch-v10/bug.h | 66 | ||||
| -rw-r--r-- | include/asm-cris/arch-v32/bug.h | 33 |
2 files changed, 99 insertions, 0 deletions
diff --git a/include/asm-cris/arch-v10/bug.h b/include/asm-cris/arch-v10/bug.h new file mode 100644 index 00000000000..3485d6b34bb --- /dev/null +++ b/include/asm-cris/arch-v10/bug.h @@ -0,0 +1,66 @@ +#ifndef __ASM_CRISv10_ARCH_BUG_H +#define __ASM_CRISv10_ARCH_BUG_H + +#include <linux/stringify.h> + +#ifdef CONFIG_BUG +#ifdef CONFIG_DEBUG_BUGVERBOSE +/* The BUG() macro is used for marking obviously incorrect code paths. + * It will cause a message with the file name and line number to be printed, + * and then cause an oops. The message is actually printed by handle_BUG() + * in arch/cris/kernel/traps.c, and the reason we use this method of storing + * the file name and line number is that we do not want to affect the registers + * by calling printk() before causing the oops. + */ + +#define BUG_PREFIX 0x0D7F +#define BUG_MAGIC 0x00001234 + +struct bug_frame { + unsigned short prefix; + unsigned int magic; + unsigned short clear; + unsigned short movu; + unsigned short line; + unsigned short jump; + unsigned char *filename; +}; + +#if 0 +/* Unfortunately this version of the macro does not work due to a problem + * with the compiler (aka a bug) when compiling with -O2, which sometimes + * erroneously causes the second input to be stored in a register... + */ +#define BUG() \ + __asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\ + "movu.w %0,$r0\n\t" \ + "jump %1\n\t" \ + : : "i" (__LINE__), "i" (__FILE__)) +#else +/* This version will have to do for now, until the compiler is fixed. + * The drawbacks of this version are that the file name will appear multiple + * times in the .rodata section, and that __LINE__ and __FILE__ can probably + * not be used like this with newer versions of gcc. + */ +#define BUG() \ + __asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\ + "movu.w " __stringify(__LINE__) ",$r0\n\t"\ + "jump 0f\n\t" \ + ".section .rodata\n" \ + "0:\t.string \"" __FILE__ "\"\n\t" \ + ".previous") +#endif + +#else + +/* This just causes an oops. */ +#define BUG() (*(int *)0 = 0) + +#endif + +#define HAVE_ARCH_BUG +#endif + +#include <asm-generic/bug.h> + +#endif diff --git a/include/asm-cris/arch-v32/bug.h b/include/asm-cris/arch-v32/bug.h new file mode 100644 index 00000000000..0f211e13524 --- /dev/null +++ b/include/asm-cris/arch-v32/bug.h @@ -0,0 +1,33 @@ +#ifndef __ASM_CRISv32_ARCH_BUG_H +#define __ASM_CRISv32_ARCH_BUG_H + +#include <linux/stringify.h> + +#ifdef CONFIG_BUG +#ifdef CONFIG_DEBUG_BUGVERBOSE +/* + * The penalty for the in-band code path will be the size of break 14. + * All other stuff is done out-of-band with exception handlers. + */ +#define BUG() \ + __asm__ __volatile__ ("0: break 14\n\t" \ + ".section .fixup,\"ax\"\n" \ + "1:\n\t" \ + "move.d %0, $r10\n\t" \ + "move.d %1, $r11\n\t" \ + "jump do_BUG\n\t" \ + "nop\n\t" \ + ".previous\n\t" \ + ".section __ex_table,\"a\"\n\t" \ + ".dword 0b, 1b\n\t" \ + ".previous\n\t" \ + : : "ri" (__FILE__), "i" (__LINE__)) +#else +#define BUG() __asm__ __volatile__ ("break 14\n\t") +#endif + +#define HAVE_ARCH_BUG +#endif + +#include <asm-generic/bug.h> +#endif |