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
19struct 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
67