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aca282ab7e
In preparation for the objtool klp diff subcommand, add annotations for special section entries. This will enable objtool to determine the size and location of the entries and to extract them when needed. Acked-by: Petr Mladek <pmladek@suse.com> Tested-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
112 lines
2.9 KiB
C
112 lines
2.9 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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#include <asm/asm.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 _ASM_BYTES(0x0f, 0x0b)
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#define INSN_UD2 0x0b0f
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#define LEN_UD2 2
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#define ASM_UDB _ASM_BYTES(0xd6)
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#define INSN_UDB 0xd6
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#define LEN_UDB 1
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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_UDB 0xffd6
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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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ANNOTATE_DATA_SPECIAL \
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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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