1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef PERF_LINUX_LINKAGE_H_ 4 #define PERF_LINUX_LINKAGE_H_ 5 6 /* linkage.h ... for including arch/x86/lib/memcpy_64.S */ 7 8 /* Some toolchains use other characters (e.g. '`') to mark new line in macro */ 9 #ifndef ASM_NL 10 #define ASM_NL ; 11 #endif 12 13 #ifndef __ALIGN 14 #define __ALIGN .align 4,0x90 15 #define __ALIGN_STR ".align 4,0x90" 16 #endif 17 18 /* SYM_T_FUNC -- type used by assembler to mark functions */ 19 #ifndef SYM_T_FUNC 20 #define SYM_T_FUNC STT_FUNC 21 #endif 22 23 /* SYM_A_* -- align the symbol? */ 24 #define SYM_A_ALIGN ALIGN 25 26 /* SYM_L_* -- linkage of symbols */ 27 #define SYM_L_GLOBAL(name) .globl name 28 #define SYM_L_WEAK(name) .weak name 29 #define SYM_L_LOCAL(name) /* nothing */ 30 31 #define ALIGN __ALIGN 32 33 /* === generic annotations === */ 34 35 /* SYM_ENTRY -- use only if you have to for non-paired symbols */ 36 #ifndef SYM_ENTRY 37 #define SYM_ENTRY(name, linkage, align...) \ 38 linkage(name) ASM_NL \ 39 align ASM_NL \ 40 name: 41 #endif 42 43 /* SYM_START -- use only if you have to */ 44 #ifndef SYM_START 45 #define SYM_START(name, linkage, align...) \ 46 SYM_ENTRY(name, linkage, align) 47 #endif 48 49 /* SYM_END -- use only if you have to */ 50 #ifndef SYM_END 51 #define SYM_END(name, sym_type) \ 52 .type name sym_type ASM_NL \ 53 .size name, .-name 54 #endif 55 56 /* 57 * SYM_FUNC_START_ALIAS -- use where there are two global names for one 58 * function 59 */ 60 #ifndef SYM_FUNC_START_ALIAS 61 #define SYM_FUNC_START_ALIAS(name) \ 62 SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) 63 #endif 64 65 /* SYM_FUNC_START -- use for global functions */ 66 #ifndef SYM_FUNC_START 67 /* 68 * The same as SYM_FUNC_START_ALIAS, but we will need to distinguish these two 69 * later. 70 */ 71 #define SYM_FUNC_START(name) \ 72 SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) 73 #endif 74 75 /* SYM_FUNC_START_LOCAL -- use for local functions */ 76 #ifndef SYM_FUNC_START_LOCAL 77 /* the same as SYM_FUNC_START_LOCAL_ALIAS, see comment near SYM_FUNC_START */ 78 #define SYM_FUNC_START_LOCAL(name) \ 79 SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN) 80 #endif 81 82 /* SYM_FUNC_END_ALIAS -- the end of LOCAL_ALIASed or ALIASed function */ 83 #ifndef SYM_FUNC_END_ALIAS 84 #define SYM_FUNC_END_ALIAS(name) \ 85 SYM_END(name, SYM_T_FUNC) 86 #endif 87 88 /* SYM_FUNC_START_WEAK -- use for weak functions */ 89 #ifndef SYM_FUNC_START_WEAK 90 #define SYM_FUNC_START_WEAK(name) \ 91 SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN) 92 #endif 93 94 /* 95 * SYM_FUNC_END -- the end of SYM_FUNC_START_LOCAL, SYM_FUNC_START, 96 * SYM_FUNC_START_WEAK, ... 97 */ 98 #ifndef SYM_FUNC_END 99 /* the same as SYM_FUNC_END_ALIAS, see comment near SYM_FUNC_START */ 100 #define SYM_FUNC_END(name) \ 101 SYM_END(name, SYM_T_FUNC) 102 #endif 103 104 #endif /* PERF_LINUX_LINKAGE_H_ */ 105