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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
- #ifdef CONFIG_GENERIC_BUG
- #ifdef CONFIG_X86_32
- # define __BUG_REL(val) ".long " __stringify(val)
- #else
- # define __BUG_REL(val) ".long " __stringify(val) " - ."
- #endif
- #ifdef CONFIG_DEBUG_BUGVERBOSE
- #define _BUG_FLAGS(ins, flags, extra) \
- do { \
- asm_inline 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\n" \
- extra \
- : : "i" (__FILE__), "i" (__LINE__), \
- "i" (flags), \
- "i" (sizeof(struct bug_entry))); \
- } while (0)
- #else /* !CONFIG_DEBUG_BUGVERBOSE */
- #define _BUG_FLAGS(ins, flags, extra) \
- do { \
- asm_inline 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\n" \
- extra \
- : : "i" (flags), \
- "i" (sizeof(struct bug_entry))); \
- } while (0)
- #endif /* CONFIG_DEBUG_BUGVERBOSE */
- #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 __WARN_FLAGS(flags) \
- do { \
- __auto_type __flags = BUGFLAG_WARNING|(flags); \
- instrumentation_begin(); \
- _BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \
- instrumentation_end(); \
- } while (0)
- #include <asm-generic/bug.h>
- #endif /* _ASM_X86_BUG_H */
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