Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef __ASM_X8664_BUG_H
2#define __ASM_X8664_BUG_H 1
3
4#include <linux/stringify.h>
5
6/*
7 * Tell the user there is some problem. The exception handler decodes
8 * this frame.
9 */
10struct bug_frame {
11 unsigned char ud2[2];
12 unsigned char mov;
13 /* should use 32bit offset instead, but the assembler doesn't
14 like it */
15 char *filename;
16 unsigned char ret;
17 unsigned short line;
18} __attribute__((packed));
19
20#ifdef CONFIG_BUG
21#define HAVE_ARCH_BUG
22/* We turn the bug frame into valid instructions to not confuse
23 the disassembler. Thanks to Jan Beulich & Suresh Siddha
24 for nice instruction selection.
25 The magic numbers generate mov $64bitimm,%eax ; ret $offset. */
26#define BUG() \
27 asm volatile( \
28 "ud2 ; .byte 0xa3 ; .quad %c1 ; .byte 0xc2 ; .short %c0" :: \
29 "i"(__LINE__), "i" (__stringify(__FILE__)))
30void out_of_line_bug(void);
31#else
32static inline void out_of_line_bug(void) { }
33#endif
34
35#include <asm-generic/bug.h>
36#endif