linux/arch/x86/include/asm/linkage.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_LINKAGE_H
#define _ASM_X86_LINKAGE_H

#include <linux/stringify.h>
#include <asm/ibt.h>

#undef notrace
#define notrace …

#ifdef CONFIG_64BIT
/*
 * The generic version tends to create spurious ENDBR instructions under
 * certain conditions.
 */
#define _THIS_IP_ …
#endif

#ifdef CONFIG_X86_32
#define asmlinkage …
#endif /* CONFIG_X86_32 */

#define __ALIGN …
#define __ALIGN_STR …

#if defined(CONFIG_CALL_PADDING) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define FUNCTION_PADDING …
#else
#define FUNCTION_PADDING
#endif

#if (CONFIG_FUNCTION_ALIGNMENT > 8) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define __FUNC_ALIGN …
#else
#define __FUNC_ALIGN …
#endif

#define ASM_FUNC_ALIGN …
#define SYM_F_ALIGN …

#ifdef __ASSEMBLY__

#if defined(CONFIG_MITIGATION_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define RET …
#else /* CONFIG_MITIGATION_RETPOLINE */
#ifdef CONFIG_MITIGATION_SLS
#define RET …
#else
#define RET …
#endif
#endif /* CONFIG_MITIGATION_RETPOLINE */

#else /* __ASSEMBLY__ */

#if defined(CONFIG_MITIGATION_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define ASM_RET …
#else /* CONFIG_MITIGATION_RETPOLINE */
#ifdef CONFIG_MITIGATION_SLS
#define ASM_RET …
#else
#define ASM_RET …
#endif
#endif /* CONFIG_MITIGATION_RETPOLINE */

#endif /* __ASSEMBLY__ */

/*
 * Depending on -fpatchable-function-entry=N,N usage (CONFIG_CALL_PADDING) the
 * CFI symbol layout changes.
 *
 * Without CALL_THUNKS:
 *
 * 	.align	FUNCTION_ALIGNMENT
 * __cfi_##name:
 * 	.skip	FUNCTION_PADDING, 0x90
 * 	.byte   0xb8
 * 	.long	__kcfi_typeid_##name
 * name:
 *
 * With CALL_THUNKS:
 *
 * 	.align FUNCTION_ALIGNMENT
 * __cfi_##name:
 * 	.byte	0xb8
 * 	.long	__kcfi_typeid_##name
 * 	.skip	FUNCTION_PADDING, 0x90
 * name:
 *
 * In both cases the whole thing is FUNCTION_ALIGNMENT aligned and sized.
 */

#ifdef CONFIG_CALL_PADDING
#define CFI_PRE_PADDING
#define CFI_POST_PADDING …
#else
#define CFI_PRE_PADDING …
#define CFI_POST_PADDING
#endif

#define __CFI_TYPE(name) …

/* UML needs to be able to override memcpy() and friends for KASAN. */
#ifdef CONFIG_UML
#define SYM_FUNC_ALIAS_MEMFUNC …
#else
#define SYM_FUNC_ALIAS_MEMFUNC …
#endif

/* SYM_TYPED_FUNC_START -- use for indirectly called globals, w/ CFI type */
#define SYM_TYPED_FUNC_START(name) …

/* SYM_FUNC_START -- use for global functions */
#define SYM_FUNC_START(name) …

/* SYM_FUNC_START_NOALIGN -- use for global functions, w/o alignment */
#define SYM_FUNC_START_NOALIGN(name) …

/* SYM_FUNC_START_LOCAL -- use for local functions */
#define SYM_FUNC_START_LOCAL(name) …

/* SYM_FUNC_START_LOCAL_NOALIGN -- use for local functions, w/o alignment */
#define SYM_FUNC_START_LOCAL_NOALIGN(name) …

/* SYM_FUNC_START_WEAK -- use for weak functions */
#define SYM_FUNC_START_WEAK(name) …

/* SYM_FUNC_START_WEAK_NOALIGN -- use for weak functions, w/o alignment */
#define SYM_FUNC_START_WEAK_NOALIGN(name) …

#endif /* _ASM_X86_LINKAGE_H */