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8c8efa93db
Add new ARCH_WARN_ASM macro for BUG/WARN assembly code sharing with Rust to avoid the duplication. No functional changes. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Link: https://lore.kernel.org/r/20250502094537.231725-2-fujita.tomonori@gmail.com [ Fixed typo in macro parameter name. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_BUG_H
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#define _ASM_X86_BUG_H
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#include <linux/stringify.h>
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#include <linux/instrumentation.h>
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#include <linux/objtool.h>
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/*
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* Despite that some emulators terminate on UD2, we use it for WARN().
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*/
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#define ASM_UD2 ".byte 0x0f, 0x0b"
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#define INSN_UD2 0x0b0f
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#define LEN_UD2 2
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/*
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* In clang we have UD1s reporting UBSAN failures on X86, 64 and 32bit.
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*/
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#define INSN_ASOP 0x67
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#define INSN_LOCK 0xf0
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#define OPCODE_ESCAPE 0x0f
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#define SECOND_BYTE_OPCODE_UD1 0xb9
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#define SECOND_BYTE_OPCODE_UD2 0x0b
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#define BUG_NONE 0xffff
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#define BUG_UD2 0xfffe
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#define BUG_UD1 0xfffd
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#define BUG_UD1_UBSAN 0xfffc
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#define BUG_EA 0xffea
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#define BUG_LOCK 0xfff0
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#ifdef CONFIG_GENERIC_BUG
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#ifdef CONFIG_X86_32
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# define __BUG_REL(val) ".long " val
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#else
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# define __BUG_REL(val) ".long " val " - ."
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#endif
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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#define __BUG_ENTRY(file, line, flags) \
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"2:\t" __BUG_REL("1b") "\t# bug_entry::bug_addr\n" \
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"\t" __BUG_REL(file) "\t# bug_entry::file\n" \
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"\t.word " line "\t# bug_entry::line\n" \
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"\t.word " flags "\t# bug_entry::flags\n"
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#else
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#define __BUG_ENTRY(file, line, flags) \
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"2:\t" __BUG_REL("1b") "\t# bug_entry::bug_addr\n" \
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"\t.word " flags "\t# bug_entry::flags\n"
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#endif
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#define _BUG_FLAGS_ASM(ins, file, line, flags, size, extra) \
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"1:\t" ins "\n" \
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".pushsection __bug_table,\"aw\"\n" \
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__BUG_ENTRY(file, line, flags) \
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"\t.org 2b + " size "\n" \
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".popsection\n" \
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extra
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#define _BUG_FLAGS(ins, flags, extra) \
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do { \
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asm_inline volatile(_BUG_FLAGS_ASM(ins, "%c0", \
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"%c1", "%c2", "%c3", extra) \
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: : "i" (__FILE__), "i" (__LINE__), \
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"i" (flags), \
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"i" (sizeof(struct bug_entry))); \
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} while (0)
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#define ARCH_WARN_ASM(file, line, flags, size) \
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_BUG_FLAGS_ASM(ASM_UD2, file, line, flags, size, "")
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#else
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#define _BUG_FLAGS(ins, flags, extra) asm volatile(ins)
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#endif /* CONFIG_GENERIC_BUG */
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#define HAVE_ARCH_BUG
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#define BUG() \
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do { \
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instrumentation_begin(); \
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_BUG_FLAGS(ASM_UD2, 0, ""); \
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__builtin_unreachable(); \
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} while (0)
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/*
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* This instrumentation_begin() is strictly speaking incorrect; but it
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* suppresses the complaints from WARN()s in noinstr code. If such a WARN()
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* were to trigger, we'd rather wreck the machine in an attempt to get the
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* message out than not know about it.
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*/
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#define ARCH_WARN_REACHABLE ANNOTATE_REACHABLE(1b)
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#define __WARN_FLAGS(flags) \
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do { \
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__auto_type __flags = BUGFLAG_WARNING|(flags); \
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instrumentation_begin(); \
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_BUG_FLAGS(ASM_UD2, __flags, ARCH_WARN_REACHABLE); \
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instrumentation_end(); \
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} while (0)
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#include <asm-generic/bug.h>
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#endif /* _ASM_X86_BUG_H */
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