linux/include/asm-sh/bug.h
Paul Mundt dc34d312c7 sh: BUG() handling through trapa vector.
Previously we haven't been doing anything with verbose BUG() reporting,
and we've been relying on the oops path for handling BUG()'s, which is
rather sub-optimal.

This switches BUG handling to use a fixed trapa vector (#0x3e) where we
construct a small bug frame post trapa instruction to get the context
right. This also makes it trivial to wire up a DIE_BUG for the atomic
die chain, which we couldn't really do before.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-12-12 08:42:08 +09:00

55 lines
919 B
C

#ifndef __ASM_SH_BUG_H
#define __ASM_SH_BUG_H
#ifdef CONFIG_BUG
struct bug_frame {
unsigned short opcode;
unsigned short line;
const char *file;
const char *func;
};
struct pt_regs;
extern void handle_BUG(struct pt_regs *);
#define TRAPA_BUG_OPCODE 0xc33e /* trapa #0x3e */
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define BUG() \
do { \
__asm__ __volatile__ ( \
".align 2\n\t" \
".short %O0\n\t" \
".short %O1\n\t" \
".long %O2\n\t" \
".long %O3\n\t" \
: \
: "n" (TRAPA_BUG_OPCODE), \
"i" (__LINE__), "X" (__FILE__), \
"X" (__FUNCTION__)); \
} while (0)
#else
#define BUG() \
do { \
__asm__ __volatile__ ( \
".align 2\n\t" \
".short %O0\n\t" \
: \
: "n" (TRAPA_BUG_OPCODE)); \
} while (0)
#endif /* CONFIG_DEBUG_BUGVERBOSE */
#define HAVE_ARCH_BUG
#endif /* CONFIG_BUG */
#include <asm-generic/bug.h>
#endif /* __ASM_SH_BUG_H */