diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2006-12-08 02:36:22 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-08 08:28:39 -0800 |
| commit | c31a0bf3e1bc581676618db7492f18798fd0a73f (patch) | |
| tree | 68eb38dbc58d647c3b20cd73fb812cafe93eb663 /include/asm-x86_64 | |
| parent | 91768d6c2bad0d2766a166f13f2f57e197de3458 (diff) | |
| download | linux-c31a0bf3e1bc581676618db7492f18798fd0a73f.tar.bz2 | |
[PATCH] Generic BUG for x86-64
This makes x86-64 use the generic BUG machinery.
The main advantage in using the generic BUG machinery for x86-64 is that
the inlined overhead of BUG is just the ud2a instruction; the file+line
information are no longer inlined into the instruction stream. This
reduces cache pollution.
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andi Kleen <ak@muc.de>
Cc: Hugh Dickens <hugh@veritas.com>
Cc: Michael Ellerman <michael@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
| -rw-r--r-- | include/asm-x86_64/bug.h | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/include/asm-x86_64/bug.h b/include/asm-x86_64/bug.h index 80ac1fe966ac..682606414913 100644 --- a/include/asm-x86_64/bug.h +++ b/include/asm-x86_64/bug.h @@ -1,30 +1,30 @@ #ifndef __ASM_X8664_BUG_H #define __ASM_X8664_BUG_H 1 -#include <linux/stringify.h> - -/* - * Tell the user there is some problem. The exception handler decodes - * this frame. - */ -struct bug_frame { - unsigned char ud2[2]; - unsigned char push; - signed int filename; - unsigned char ret; - unsigned short line; -} __attribute__((packed)); - #ifdef CONFIG_BUG #define HAVE_ARCH_BUG -/* We turn the bug frame into valid instructions to not confuse - the disassembler. Thanks to Jan Beulich & Suresh Siddha - for nice instruction selection. - The magic numbers generate mov $64bitimm,%eax ; ret $offset. */ -#define BUG() \ - asm volatile( \ - "ud2 ; pushq $%c1 ; ret $%c0" :: \ - "i"(__LINE__), "i" (__FILE__)) + +#ifdef CONFIG_DEBUG_BUGVERBOSE +#define BUG() \ + do { \ + asm volatile("1:\tud2\n" \ + ".pushsection __bug_table,\"a\"\n" \ + "2:\t.quad 1b, %c0\n" \ + "\t.word %c1, 0\n" \ + "\t.org 2b+%c2\n" \ + ".popsection" \ + : : "i" (__FILE__), "i" (__LINE__), \ + "i" (sizeof(struct bug_entry))); \ + for(;;) ; \ + } while(0) +#else +#define BUG() \ + do { \ + asm volatile("ud2"); \ + for(;;) ; \ + } while(0) +#endif + void out_of_line_bug(void); #else static inline void out_of_line_bug(void) { } |