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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_BUG_H
#define _ASM_X86_BUG_H
#include <linux/stringify.h>
#include <linux/instrumentation.h>
#include <linux/objtool.h>
/*
* Despite that some emulators terminate on UD2, we use it for WARN().
*/
#define ASM_UD2 ".byte 0x0f, 0x0b"
#define INSN_UD2 0x0b0f
#define LEN_UD2 2
/*
* In clang we have UD1s reporting UBSAN failures on X86, 64 and 32bit.
*/
#define INSN_ASOP 0x67
#define INSN_LOCK 0xf0
#define OPCODE_ESCAPE 0x0f
#define SECOND_BYTE_OPCODE_UD1 0xb9
#define SECOND_BYTE_OPCODE_UD2 0x0b
#define BUG_NONE 0xffff
#define BUG_UD2 0xfffe
#define BUG_UD1 0xfffd
#define BUG_UD1_UBSAN 0xfffc
#define BUG_EA 0xffea
#define BUG_LOCK 0xfff0
#ifdef CONFIG_GENERIC_BUG
#ifdef CONFIG_X86_32
# define __BUG_REL(val) ".long " val
#else
# define __BUG_REL(val) ".long " val " - ."
#endif
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define __BUG_ENTRY(file, line, flags) \
"2:\t" __BUG_REL("1b") "\t# bug_entry::bug_addr\n" \
"\t" __BUG_REL(file) "\t# bug_entry::file\n" \
"\t.word " line "\t# bug_entry::line\n" \
"\t.word " flags "\t# bug_entry::flags\n"
#else
#define __BUG_ENTRY(file, line, flags) \
"2:\t" __BUG_REL("1b") "\t# bug_entry::bug_addr\n" \
"\t.word " flags "\t# bug_entry::flags\n"
#endif
#define _BUG_FLAGS_ASM(ins, file, line, flags, size, extra) \
"1:\t" ins "\n" \
".pushsection __bug_table,\"aw\"\n" \
__BUG_ENTRY(file, line, flags) \
"\t.org 2b + " size "\n" \
".popsection\n" \
extra
#define _BUG_FLAGS(ins, flags, extra) \
do { \
asm_inline volatile(_BUG_FLAGS_ASM(ins, "%c0", \
"%c1", "%c2", "%c3", extra) \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (flags), \
"i" (sizeof(struct bug_entry))); \
} while (0)
#define ARCH_WARN_ASM(file, line, flags, size) \
_BUG_FLAGS_ASM(ASM_UD2, file, line, flags, size, "")
#else
#define _BUG_FLAGS(ins, flags, extra) asm volatile(ins)
#endif /* CONFIG_GENERIC_BUG */
#define HAVE_ARCH_BUG
#define BUG() \
do { \
instrumentation_begin(); \
_BUG_FLAGS(ASM_UD2, 0, ""); \
__builtin_unreachable(); \
} while (0)
/*
* This instrumentation_begin() is strictly speaking incorrect; but it
* suppresses the complaints from WARN()s in noinstr code. If such a WARN()
* were to trigger, we'd rather wreck the machine in an attempt to get the
* message out than not know about it.
*/
#define ARCH_WARN_REACHABLE ANNOTATE_REACHABLE(1b)
#define __WARN_FLAGS(flags) \
do { \
__auto_type __flags = BUGFLAG_WARNING|(flags); \
instrumentation_begin(); \
_BUG_FLAGS(ASM_UD2, __flags, ARCH_WARN_REACHABLE); \
instrumentation_end(); \
} while (0)
#include <asm-generic/bug.h>
#endif /* _ASM_X86_BUG_H */
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