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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_NL10#define ASM_NL ;11#endif12 13#ifndef __ALIGN14#define __ALIGN .align 4,0x9015#define __ALIGN_STR ".align 4,0x90"16#endif17 18/* SYM_T_FUNC -- type used by assembler to mark functions */19#ifndef SYM_T_FUNC20#define SYM_T_FUNC STT_FUNC21#endif22 23/* SYM_A_* -- align the symbol? */24#define SYM_A_ALIGN ALIGN25 26/* SYM_L_* -- linkage of symbols */27#define SYM_L_GLOBAL(name) .globl name28#define SYM_L_WEAK(name) .weak name29#define SYM_L_LOCAL(name) /* nothing */30 31#define ALIGN __ALIGN32 33/* === generic annotations === */34 35/* SYM_ENTRY -- use only if you have to for non-paired symbols */36#ifndef SYM_ENTRY37#define SYM_ENTRY(name, linkage, align...) \38 linkage(name) ASM_NL \39 align ASM_NL \40 name:41#endif42 43/* SYM_START -- use only if you have to */44#ifndef SYM_START45#define SYM_START(name, linkage, align...) \46 SYM_ENTRY(name, linkage, align)47#endif48 49/* SYM_END -- use only if you have to */50#ifndef SYM_END51#define SYM_END(name, sym_type) \52 .type name sym_type ASM_NL \53 .set .L__sym_size_##name, .-name ASM_NL \54 .size name, .-name55#endif56 57/* SYM_ALIAS -- use only if you have to */58#ifndef SYM_ALIAS59#define SYM_ALIAS(alias, name, sym_type, linkage) \60 linkage(alias) ASM_NL \61 .set alias, name ASM_NL \62 .type alias sym_type ASM_NL \63 .set .L__sym_size_##alias, .L__sym_size_##name ASM_NL \64 .size alias, .L__sym_size_##alias65#endif66 67/* SYM_FUNC_START -- use for global functions */68#ifndef SYM_FUNC_START69#define SYM_FUNC_START(name) \70 SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)71#endif72 73/* SYM_FUNC_START_LOCAL -- use for local functions */74#ifndef SYM_FUNC_START_LOCAL75#define SYM_FUNC_START_LOCAL(name) \76 SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)77#endif78 79/* SYM_FUNC_START_WEAK -- use for weak functions */80#ifndef SYM_FUNC_START_WEAK81#define SYM_FUNC_START_WEAK(name) \82 SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN)83#endif84 85/*86 * SYM_FUNC_END -- the end of SYM_FUNC_START_LOCAL, SYM_FUNC_START,87 * SYM_FUNC_START_WEAK, ...88 */89#ifndef SYM_FUNC_END90#define SYM_FUNC_END(name) \91 SYM_END(name, SYM_T_FUNC)92#endif93 94/*95 * SYM_FUNC_ALIAS -- define a global alias for an existing function96 */97#ifndef SYM_FUNC_ALIAS98#define SYM_FUNC_ALIAS(alias, name) \99 SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_GLOBAL)100#endif101 102/*103 * SYM_FUNC_ALIAS_LOCAL -- define a local alias for an existing function104 */105#ifndef SYM_FUNC_ALIAS_LOCAL106#define SYM_FUNC_ALIAS_LOCAL(alias, name) \107 SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_LOCAL)108#endif109 110/*111 * SYM_FUNC_ALIAS_WEAK -- define a weak global alias for an existing function112 */113#ifndef SYM_FUNC_ALIAS_WEAK114#define SYM_FUNC_ALIAS_WEAK(alias, name) \115 SYM_ALIAS(alias, name, SYM_T_FUNC, SYM_L_WEAK)116#endif117 118#ifndef SYM_FUNC_ALIAS_MEMFUNC119#define SYM_FUNC_ALIAS_MEMFUNC SYM_FUNC_ALIAS120#endif121 122// In the kernel sources (include/linux/cfi_types.h), this has a different123// definition when CONFIG_CFI_CLANG is used, for tools/ just use the !clang124// definition:125#ifndef SYM_TYPED_START126#define SYM_TYPED_START(name, linkage, align...) \127 SYM_START(name, linkage, align)128#endif129 130#ifndef SYM_TYPED_FUNC_START131#define SYM_TYPED_FUNC_START(name) \132 SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)133#endif134 135#endif /* PERF_LINUX_LINKAGE_H_ */136