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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_ANNOTATE_H
#define _LINUX_ANNOTATE_H
#include <linux/objtool_types.h>
#ifdef CONFIG_OBJTOOL
#ifndef __ASSEMBLY__
#define __ASM_ANNOTATE(label, type) \
".pushsection .discard.annotate_insn,\"M\",@progbits,8\n\t" \
".long " __stringify(label) " - .\n\t" \
".long " __stringify(type) "\n\t" \
".popsection\n\t"
#define ASM_ANNOTATE(type) \
"911:\n\t" \
__ASM_ANNOTATE(911b, type)
#else /* __ASSEMBLY__ */
.macro ANNOTATE type:req
.Lhere_\@:
.pushsection .discard.annotate_insn,"M",@progbits,8
.long .Lhere_\@ - .
.long \type
.popsection
.endm
#endif /* __ASSEMBLY__ */
#else /* !CONFIG_OBJTOOL */
#ifndef __ASSEMBLY__
#define __ASM_ANNOTATE(label, type) ""
#define ASM_ANNOTATE(type)
#else /* __ASSEMBLY__ */
.macro ANNOTATE type:req
.endm
#endif /* __ASSEMBLY__ */
#endif /* !CONFIG_OBJTOOL */
#ifndef __ASSEMBLY__
/*
* Annotate away the various 'relocation to !ENDBR` complaints; knowing that
* these relocations will never be used for indirect calls.
*/
#define ANNOTATE_NOENDBR ASM_ANNOTATE(ANNOTYPE_NOENDBR)
#define ANNOTATE_NOENDBR_SYM(sym) asm(__ASM_ANNOTATE(sym, ANNOTYPE_NOENDBR))
/*
* This should be used immediately before an indirect jump/call. It tells
* objtool the subsequent indirect jump/call is vouched safe for retpoline
* builds.
*/
#define ANNOTATE_RETPOLINE_SAFE ASM_ANNOTATE(ANNOTYPE_RETPOLINE_SAFE)
/*
* See linux/instrumentation.h
*/
#define ANNOTATE_INSTR_BEGIN(label) __ASM_ANNOTATE(label, ANNOTYPE_INSTR_BEGIN)
#define ANNOTATE_INSTR_END(label) __ASM_ANNOTATE(label, ANNOTYPE_INSTR_END)
/*
* objtool annotation to ignore the alternatives and only consider the original
* instruction(s).
*/
#define ANNOTATE_IGNORE_ALTERNATIVE ASM_ANNOTATE(ANNOTYPE_IGNORE_ALTS)
/*
* This macro indicates that the following intra-function call is valid.
* Any non-annotated intra-function call will cause objtool to issue a warning.
*/
#define ANNOTATE_INTRA_FUNCTION_CALL ASM_ANNOTATE(ANNOTYPE_INTRA_FUNCTION_CALL)
/*
* Use objtool to validate the entry requirement that all code paths do
* VALIDATE_UNRET_END before RET.
*
* NOTE: The macro must be used at the beginning of a global symbol, otherwise
* it will be ignored.
*/
#define ANNOTATE_UNRET_BEGIN ASM_ANNOTATE(ANNOTYPE_UNRET_BEGIN)
/*
* This should be used to refer to an instruction that is considered
* terminating, like a noreturn CALL or UD2 when we know they are not -- eg
* WARN using UD2.
*/
#define ANNOTATE_REACHABLE(label) __ASM_ANNOTATE(label, ANNOTYPE_REACHABLE)
/*
* This should not be used; it annotates away CFI violations. There are a few
* valid use cases like kexec handover to the next kernel image, and there is
* no security concern there.
*
* There are also a few real issues annotated away, like EFI because we can't
* control the EFI code.
*/
#define ANNOTATE_NOCFI_SYM(sym) asm(__ASM_ANNOTATE(sym, ANNOTYPE_NOCFI))
#else /* __ASSEMBLY__ */
#define ANNOTATE_NOENDBR ANNOTATE type=ANNOTYPE_NOENDBR
#define ANNOTATE_RETPOLINE_SAFE ANNOTATE type=ANNOTYPE_RETPOLINE_SAFE
/* ANNOTATE_INSTR_BEGIN ANNOTATE type=ANNOTYPE_INSTR_BEGIN */
/* ANNOTATE_INSTR_END ANNOTATE type=ANNOTYPE_INSTR_END */
#define ANNOTATE_IGNORE_ALTERNATIVE ANNOTATE type=ANNOTYPE_IGNORE_ALTS
#define ANNOTATE_INTRA_FUNCTION_CALL ANNOTATE type=ANNOTYPE_INTRA_FUNCTION_CALL
#define ANNOTATE_UNRET_BEGIN ANNOTATE type=ANNOTYPE_UNRET_BEGIN
#define ANNOTATE_REACHABLE ANNOTATE type=ANNOTYPE_REACHABLE
#define ANNOTATE_NOCFI_SYM ANNOTATE type=ANNOTYPE_NOCFI
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_ANNOTATE_H */
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