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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_BUG_H #define _ASM_X86_BUG_H #include <linux/stringify.h> /* * Despite that some emulators terminate on UD2, we use it for WARN(). * * Since various instruction decoders/specs disagree on the encoding of * UD0/UD1. */ #define ASM_UD0 ".byte 0x0f, 0xff" /* + ModRM (for Intel) */ #define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */ #define ASM_UD2 ".byte 0x0f, 0x0b" #define INSN_UD0 0xff0f #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) " - 2b" #endif #ifdef CONFIG_DEBUG_BUGVERBOSE #define _BUG_FLAGS(ins, flags) \ 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" \ : : "i" (__FILE__), "i" (__LINE__), \ "i" (flags), \ "i" (sizeof(struct bug_entry))); \ } while (0) #else /* !CONFIG_DEBUG_BUGVERBOSE */ #define _BUG_FLAGS(ins, flags) \ 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" \ : : "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) \ do { \ _BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \ annotate_reachable(); \ } while (0) #include <asm-generic/bug.h> #endif /* _ASM_X86_BUG_H */
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