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/* 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 __attribute__((no_instrument_function))
#ifdef CONFIG_64BIT
/*
* The generic version tends to create spurious ENDBR instructions under
* certain conditions.
*/
#define _THIS_IP_ ({ unsigned long __here; asm ("lea 0(%%rip), %0" : "=r" (__here)); __here; })
#endif
#ifdef CONFIG_X86_32
#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
#endif /* CONFIG_X86_32 */
#define __ALIGN .balign CONFIG_FUNCTION_ALIGNMENT, 0x90;
#define __ALIGN_STR __stringify(__ALIGN)
#if defined(CONFIG_CALL_PADDING) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define FUNCTION_PADDING .skip CONFIG_FUNCTION_ALIGNMENT, 0x90;
#else
#define FUNCTION_PADDING
#endif
#if (CONFIG_FUNCTION_ALIGNMENT > 8) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
# define __FUNC_ALIGN __ALIGN; FUNCTION_PADDING
#else
# define __FUNC_ALIGN __ALIGN
#endif
#define ASM_FUNC_ALIGN __stringify(__FUNC_ALIGN)
#define SYM_F_ALIGN __FUNC_ALIGN
#ifdef __ASSEMBLY__
#if defined(CONFIG_MITIGATION_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define RET jmp __x86_return_thunk
#else /* CONFIG_MITIGATION_RETPOLINE */
#ifdef CONFIG_MITIGATION_SLS
#define RET ret; int3
#else
#define RET ret
#endif
#endif /* CONFIG_MITIGATION_RETPOLINE */
#else /* __ASSEMBLY__ */
#if defined(CONFIG_MITIGATION_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
#define ASM_RET "jmp __x86_return_thunk\n\t"
#else /* CONFIG_MITIGATION_RETPOLINE */
#ifdef CONFIG_MITIGATION_SLS
#define ASM_RET "ret; int3\n\t"
#else
#define ASM_RET "ret\n\t"
#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 .skip CONFIG_FUNCTION_PADDING_BYTES, 0x90;
#else
#define CFI_PRE_PADDING .skip CONFIG_FUNCTION_PADDING_BYTES, 0x90;
#define CFI_POST_PADDING
#endif
#define __CFI_TYPE(name) \
SYM_START(__cfi_##name, SYM_L_LOCAL, SYM_A_NONE) \
CFI_PRE_PADDING \
.byte 0xb8 ASM_NL \
.long __kcfi_typeid_##name ASM_NL \
CFI_POST_PADDING \
SYM_FUNC_END(__cfi_##name)
/* UML needs to be able to override memcpy() and friends for KASAN. */
#ifdef CONFIG_UML
# define SYM_FUNC_ALIAS_MEMFUNC SYM_FUNC_ALIAS_WEAK
#else
# define SYM_FUNC_ALIAS_MEMFUNC SYM_FUNC_ALIAS
#endif
/* SYM_TYPED_FUNC_START -- use for indirectly called globals, w/ CFI type */
#define SYM_TYPED_FUNC_START(name) \
SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_F_ALIGN) \
ENDBR
/* SYM_FUNC_START -- use for global functions */
#define SYM_FUNC_START(name) \
SYM_START(name, SYM_L_GLOBAL, SYM_F_ALIGN) \
ENDBR
/* SYM_FUNC_START_NOALIGN -- use for global functions, w/o alignment */
#define SYM_FUNC_START_NOALIGN(name) \
SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE) \
ENDBR
/* SYM_FUNC_START_LOCAL -- use for local functions */
#define SYM_FUNC_START_LOCAL(name) \
SYM_START(name, SYM_L_LOCAL, SYM_F_ALIGN) \
ENDBR
/* SYM_FUNC_START_LOCAL_NOALIGN -- use for local functions, w/o alignment */
#define SYM_FUNC_START_LOCAL_NOALIGN(name) \
SYM_START(name, SYM_L_LOCAL, SYM_A_NONE) \
ENDBR
/* SYM_FUNC_START_WEAK -- use for weak functions */
#define SYM_FUNC_START_WEAK(name) \
SYM_START(name, SYM_L_WEAK, SYM_F_ALIGN) \
ENDBR
/* SYM_FUNC_START_WEAK_NOALIGN -- use for weak functions, w/o alignment */
#define SYM_FUNC_START_WEAK_NOALIGN(name) \
SYM_START(name, SYM_L_WEAK, SYM_A_NONE) \
ENDBR
#endif /* _ASM_X86_LINKAGE_H */
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