include/asm-generic/export.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef __ASM_GENERIC_EXPORT_H
   3 #define __ASM_GENERIC_EXPORT_H
   4
   5 #ifndef KSYM_FUNC
   6 #define KSYM_FUNC(x) x
   7 #endif
   8 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
   9 #define KSYM_ALIGN 4
  10 #elif defined(CONFIG_64BIT)
  11 #define KSYM_ALIGN 8
  12 #else
  13 #define KSYM_ALIGN 4
  14 #endif
  15 #ifndef KCRC_ALIGN
  16 #define KCRC_ALIGN 4
  17 #endif
  18
  19 .macro __put, val, name
  20 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
  21         .long   \val - ., \name - ., 0
  22 #elif defined(CONFIG_64BIT)
  23         .quad   \val, \name, 0
  24 #else
  25         .long   \val, \name, 0
  26 #endif
  27 .endm
  28
  29 /*
  30  * note on .section use: @progbits vs %progbits nastiness doesn't matter,
  31  * since we immediately emit into those sections anyway.
  32  */
  33 .macro ___EXPORT_SYMBOL name,val,sec
  34 #ifdef CONFIG_MODULES
  35         .section ___ksymtab\sec+\name,"a"
  36         .balign KSYM_ALIGN
  37 __ksymtab_\name:
  38         __put \val, __kstrtab_\name
  39         .previous
  40         .section __ksymtab_strings,"a"
  41 __kstrtab_\name:
  42         .asciz "\name"
  43         .previous
  44 #ifdef CONFIG_MODVERSIONS
  45         .section ___kcrctab\sec+\name,"a"
  46         .balign KCRC_ALIGN
  47 #if defined(CONFIG_MODULE_REL_CRCS)
  48         .long __crc_\name - .
  49 #else
  50         .long __crc_\name
  51 #endif
  52         .weak __crc_\name
  53         .previous
  54 #endif
  55 #endif
  56 .endm
  57
  58 #if defined(CONFIG_TRIM_UNUSED_KSYMS)
  59
  60 #include <linux/kconfig.h>
  61 #include <generated/autoksyms.h>
  62
  63 .macro __ksym_marker sym
  64         .section ".discard.ksym","a"
  65 __ksym_marker_\sym:
  66          .previous
  67 .endm
  68
  69 #define __EXPORT_SYMBOL(sym, val, sec)                          \
  70         __ksym_marker sym;                                      \
  71         __cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
  72 #define __cond_export_sym(sym, val, sec, conf)                  \
  73         ___cond_export_sym(sym, val, sec, conf)
  74 #define ___cond_export_sym(sym, val, sec, enabled)              \
  75         __cond_export_sym_##enabled(sym, val, sec)
  76 #define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  77 #define __cond_export_sym_0(sym, val, sec) /* nothing */
  78
  79 #else
  80 #define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
  81 #endif
  82
  83 #define EXPORT_SYMBOL(name)                                     \
  84         __EXPORT_SYMBOL(name, KSYM_FUNC(name),)
  85 #define EXPORT_SYMBOL_GPL(name)                                 \
  86         __EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
  87 #define EXPORT_DATA_SYMBOL(name)                                \
  88         __EXPORT_SYMBOL(name, name,)
  89 #define EXPORT_DATA_SYMBOL_GPL(name)                            \
  90         __EXPORT_SYMBOL(name, name,_gpl)
  91
  92 #endif