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305c8dc477
Consolidate __ASM_ANNOTATE into a single macro which is used by both C and asm. This also makes the code generation a bit more palatable by putting it all on a single line. Turn this: 911: .pushsection .discard.annotate_insn,"M", @progbits, 8 .long 911b - . .long 1 .popsection jmp __x86_return_thunk Into: 911: .pushsection ".discard.annotate_insn", "M", @progbits, 8; .long 911b - .; .long 1; .popsection jmp __x86_return_thunk Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://patch.msgid.link/c05ff40d3383e85c3b59018ef0b3c7aaf993a60d.1764694625.git.jpoimboe@kernel.org
129 lines
4.2 KiB
C
129 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_ANNOTATE_H
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#define _LINUX_ANNOTATE_H
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#include <linux/objtool_types.h>
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#ifdef CONFIG_OBJTOOL
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#define __ASM_ANNOTATE(section, label, type) \
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.pushsection section, "M", @progbits, 8; \
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.long label - .; \
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.long type; \
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.popsection
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#ifndef __ASSEMBLY__
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#define ASM_ANNOTATE_LABEL(label, type) \
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__stringify(__ASM_ANNOTATE(".discard.annotate_insn", label, type)) "\n\t"
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#define ASM_ANNOTATE(type) \
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"911: " \
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__stringify(__ASM_ANNOTATE(".discard.annotate_insn", 911b, type)) "\n\t"
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#define ASM_ANNOTATE_DATA(type) \
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"912: " \
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__stringify(__ASM_ANNOTATE(".discard.annotate_data", 912b, type)) "\n\t"
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#else /* __ASSEMBLY__ */
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.macro ANNOTATE type
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.Lhere_\@:
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__ASM_ANNOTATE(".discard.annotate_insn", .Lhere_\@, \type)
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.endm
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.macro ANNOTATE_DATA type
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.Lhere_\@:
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__ASM_ANNOTATE(".discard.annotate_data", .Lhere_\@, \type)
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.endm
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#endif /* __ASSEMBLY__ */
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#else /* !CONFIG_OBJTOOL */
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#ifndef __ASSEMBLY__
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#define ASM_ANNOTATE_LABEL(label, type) ""
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#define ASM_ANNOTATE(type)
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#define ASM_ANNOTATE_DATA(type)
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#else /* __ASSEMBLY__ */
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.macro ANNOTATE type
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.endm
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.macro ANNOTATE_DATA type
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.endm
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#endif /* __ASSEMBLY__ */
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#endif /* !CONFIG_OBJTOOL */
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#ifndef __ASSEMBLY__
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/*
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* Annotate away the various 'relocation to !ENDBR` complaints; knowing that
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* these relocations will never be used for indirect calls.
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*/
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#define ANNOTATE_NOENDBR ASM_ANNOTATE(ANNOTYPE_NOENDBR)
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#define ANNOTATE_NOENDBR_SYM(sym) asm(ASM_ANNOTATE_LABEL(sym, ANNOTYPE_NOENDBR))
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/*
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* This should be used immediately before an indirect jump/call. It tells
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* objtool the subsequent indirect jump/call is vouched safe for retpoline
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* builds.
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*/
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#define ANNOTATE_RETPOLINE_SAFE ASM_ANNOTATE(ANNOTYPE_RETPOLINE_SAFE)
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/*
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* See linux/instrumentation.h
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*/
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#define ANNOTATE_INSTR_BEGIN(label) ASM_ANNOTATE_LABEL(label, ANNOTYPE_INSTR_BEGIN)
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#define ANNOTATE_INSTR_END(label) ASM_ANNOTATE_LABEL(label, ANNOTYPE_INSTR_END)
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/*
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* objtool annotation to ignore the alternatives and only consider the original
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* instruction(s).
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*/
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#define ANNOTATE_IGNORE_ALTERNATIVE ASM_ANNOTATE(ANNOTYPE_IGNORE_ALTS)
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/*
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* This macro indicates that the following intra-function call is valid.
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* Any non-annotated intra-function call will cause objtool to issue a warning.
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*/
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#define ANNOTATE_INTRA_FUNCTION_CALL ASM_ANNOTATE(ANNOTYPE_INTRA_FUNCTION_CALL)
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/*
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* Use objtool to validate the entry requirement that all code paths do
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* VALIDATE_UNRET_END before RET.
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*
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* NOTE: The macro must be used at the beginning of a global symbol, otherwise
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* it will be ignored.
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*/
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#define ANNOTATE_UNRET_BEGIN ASM_ANNOTATE(ANNOTYPE_UNRET_BEGIN)
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/*
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* This should be used to refer to an instruction that is considered
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* terminating, like a noreturn CALL or UD2 when we know they are not -- eg
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* WARN using UD2.
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*/
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#define ANNOTATE_REACHABLE(label) ASM_ANNOTATE_LABEL(label, ANNOTYPE_REACHABLE)
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/*
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* This should not be used; it annotates away CFI violations. There are a few
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* valid use cases like kexec handover to the next kernel image, and there is
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* no security concern there.
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*
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* There are also a few real issues annotated away, like EFI because we can't
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* control the EFI code.
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*/
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#define ANNOTATE_NOCFI_SYM(sym) asm(ASM_ANNOTATE_LABEL(sym, ANNOTYPE_NOCFI))
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/*
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* Annotate a special section entry. This emables livepatch module generation
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* to find and extract individual special section entries as needed.
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*/
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#define ANNOTATE_DATA_SPECIAL ASM_ANNOTATE_DATA(ANNOTYPE_DATA_SPECIAL)
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#else /* __ASSEMBLY__ */
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#define ANNOTATE_NOENDBR ANNOTATE type=ANNOTYPE_NOENDBR
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#define ANNOTATE_RETPOLINE_SAFE ANNOTATE type=ANNOTYPE_RETPOLINE_SAFE
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/* ANNOTATE_INSTR_BEGIN ANNOTATE type=ANNOTYPE_INSTR_BEGIN */
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/* ANNOTATE_INSTR_END ANNOTATE type=ANNOTYPE_INSTR_END */
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#define ANNOTATE_IGNORE_ALTERNATIVE ANNOTATE type=ANNOTYPE_IGNORE_ALTS
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#define ANNOTATE_INTRA_FUNCTION_CALL ANNOTATE type=ANNOTYPE_INTRA_FUNCTION_CALL
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#define ANNOTATE_UNRET_BEGIN ANNOTATE type=ANNOTYPE_UNRET_BEGIN
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#define ANNOTATE_REACHABLE ANNOTATE type=ANNOTYPE_REACHABLE
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#define ANNOTATE_NOCFI_SYM ANNOTATE type=ANNOTYPE_NOCFI
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#define ANNOTATE_DATA_SPECIAL ANNOTATE_DATA type=ANNOTYPE_DATA_SPECIAL
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_ANNOTATE_H */
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