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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | /* 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_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(BULID_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_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO) #define RET jmp __x86_return_thunk #else /* CONFIG_RETPOLINE */ #ifdef CONFIG_SLS #define RET ret; int3 #else #define RET ret #endif #endif /* CONFIG_RETPOLINE */ #else /* __ASSEMBLY__ */ #if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO) #define ASM_RET "jmp __x86_return_thunk\n\t" #else /* CONFIG_RETPOLINE */ #ifdef CONFIG_SLS #define ASM_RET "ret; int3\n\t" #else #define ASM_RET "ret\n\t" #endif #endif /* CONFIG_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) /* 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_A_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 */ |