85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _ASM_X86_BUG_H
|
||
|
|
#define _ASM_X86_BUG_H
|
||
|
|
|
||
|
|
#include <linux/stringify.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Since some emulators terminate on UD2, we cannot use it for WARN.
|
||
|
|
* Since various instruction decoders disagree on the length of UD1,
|
||
|
|
* we cannot use it either. So use UD0 for WARN.
|
||
|
|
*
|
||
|
|
* (binutils knows about "ud1" but {en,de}codes it as 2 bytes, whereas
|
||
|
|
* our kernel decoder thinks it takes a ModRM byte, which seems consistent
|
||
|
|
* with various things like the Intel SDM instruction encoding rules)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define ASM_UD0 ".byte 0x0f, 0xff"
|
||
|
|
#define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */
|
||
|
|
#define ASM_UD2 ".byte 0x0f, 0x0b"
|
||
|
|
|
||
|
|
#define INSN_UD0 0xff0f
|
||
|
|
#define INSN_UD2 0x0b0f
|
||
|
|
|
||
|
|
#define LEN_UD0 2
|
||
|
|
|
||
|
|
#ifdef CONFIG_GENERIC_BUG
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_32
|
||
|
|
# define __BUG_REL(val) ".long " __stringify(val)
|
||
|
|
#else
|
||
|
|
# define __BUG_REL(val) ".long " __stringify(val) " - 2b"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_DEBUG_BUGVERBOSE
|
||
|
|
|
||
|
|
#define _BUG_FLAGS(ins, flags) \
|
||
|
|
do { \
|
||
|
|
asm volatile("1:\t" ins "\n" \
|
||
|
|
".pushsection __bug_table,\"aw\"\n" \
|
||
|
|
"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
|
||
|
|
"\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \
|
||
|
|
"\t.word %c1" "\t# bug_entry::line\n" \
|
||
|
|
"\t.word %c2" "\t# bug_entry::flags\n" \
|
||
|
|
"\t.org 2b+%c3\n" \
|
||
|
|
".popsection" \
|
||
|
|
: : "i" (__FILE__), "i" (__LINE__), \
|
||
|
|
"i" (flags), \
|
||
|
|
"i" (sizeof(struct bug_entry))); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#else /* !CONFIG_DEBUG_BUGVERBOSE */
|
||
|
|
|
||
|
|
#define _BUG_FLAGS(ins, flags) \
|
||
|
|
do { \
|
||
|
|
asm volatile("1:\t" ins "\n" \
|
||
|
|
".pushsection __bug_table,\"aw\"\n" \
|
||
|
|
"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
|
||
|
|
"\t.word %c0" "\t# bug_entry::flags\n" \
|
||
|
|
"\t.org 2b+%c1\n" \
|
||
|
|
".popsection" \
|
||
|
|
: : "i" (flags), \
|
||
|
|
"i" (sizeof(struct bug_entry))); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#endif /* CONFIG_DEBUG_BUGVERBOSE */
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define _BUG_FLAGS(ins, flags) asm volatile(ins)
|
||
|
|
|
||
|
|
#endif /* CONFIG_GENERIC_BUG */
|
||
|
|
|
||
|
|
#define HAVE_ARCH_BUG
|
||
|
|
#define BUG() \
|
||
|
|
do { \
|
||
|
|
_BUG_FLAGS(ASM_UD2, 0); \
|
||
|
|
unreachable(); \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define __WARN_FLAGS(flags) _BUG_FLAGS(ASM_UD0, BUGFLAG_WARNING|(flags))
|
||
|
|
|
||
|
|
#include <asm-generic/bug.h>
|
||
|
|
|
||
|
|
#endif /* _ASM_X86_BUG_H */
|