tools/perf/util/include/linux/linkage.h

   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_LOCAL(name)                       /* nothing */
  29
  30 #define ALIGN __ALIGN
  31
  32 /* === generic annotations === */
  33
  34 /* SYM_ENTRY -- use only if you have to for non-paired symbols */
  35 #ifndef SYM_ENTRY
  36 #define SYM_ENTRY(name, linkage, align...)              \
  37         linkage(name) ASM_NL                            \
  38         align ASM_NL                                    \
  39         name:
  40 #endif
  41
  42 /* SYM_START -- use only if you have to */
  43 #ifndef SYM_START
  44 #define SYM_START(name, linkage, align...)              \
  45         SYM_ENTRY(name, linkage, align)
  46 #endif
  47
  48 /* SYM_END -- use only if you have to */
  49 #ifndef SYM_END
  50 #define SYM_END(name, sym_type)                         \
  51         .type name sym_type ASM_NL                      \
  52         .size name, .-name
  53 #endif
  54
  55 /*
  56  * SYM_FUNC_START_ALIAS -- use where there are two global names for one
  57  * function
  58  */
  59 #ifndef SYM_FUNC_START_ALIAS
  60 #define SYM_FUNC_START_ALIAS(name)                      \
  61         SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)
  62 #endif
  63
  64 /* SYM_FUNC_START -- use for global functions */
  65 #ifndef SYM_FUNC_START
  66 /*
  67  * The same as SYM_FUNC_START_ALIAS, but we will need to distinguish these two
  68  * later.
  69  */
  70 #define SYM_FUNC_START(name)                            \
  71         SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)
  72 #endif
  73
  74 /* SYM_FUNC_START_LOCAL -- use for local functions */
  75 #ifndef SYM_FUNC_START_LOCAL
  76 /* the same as SYM_FUNC_START_LOCAL_ALIAS, see comment near SYM_FUNC_START */
  77 #define SYM_FUNC_START_LOCAL(name)                      \
  78         SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)
  79 #endif
  80
  81 /* SYM_FUNC_END_ALIAS -- the end of LOCAL_ALIASed or ALIASed function */
  82 #ifndef SYM_FUNC_END_ALIAS
  83 #define SYM_FUNC_END_ALIAS(name)                        \
  84         SYM_END(name, SYM_T_FUNC)
  85 #endif
  86
  87 /*
  88  * SYM_FUNC_END -- the end of SYM_FUNC_START_LOCAL, SYM_FUNC_START,
  89  * SYM_FUNC_START_WEAK, ...
  90  */
  91 #ifndef SYM_FUNC_END
  92 /* the same as SYM_FUNC_END_ALIAS, see comment near SYM_FUNC_START */
  93 #define SYM_FUNC_END(name)                              \
  94         SYM_END(name, SYM_T_FUNC)
  95 #endif
  96
  97 #endif  /* PERF_LINUX_LINKAGE_H_ */