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  1. #ifndef _LINUX_LINKAGE_H
  2. #define _LINUX_LINKAGE_H
  3.  
  4. #include <linux/compiler.h>
  5. #include <linux/stringify.h>
  6. #include <linux/export.h>
  7. #include <asm/linkage.h>
  8.  
  9. /* Some toolchains use other characters (e.g. '`') to mark new line in macro */
  10. #ifndef ASM_NL
  11. #define ASM_NL           ;
  12. #endif
  13.  
  14. #ifdef __cplusplus
  15. #define CPP_ASMLINKAGE extern "C"
  16. #else
  17. #define CPP_ASMLINKAGE
  18. #endif
  19.  
  20. #ifndef asmlinkage
  21. #define asmlinkage CPP_ASMLINKAGE
  22. #endif
  23.  
  24. #ifndef cond_syscall
  25. #define cond_syscall(x) asm(                            \
  26.         ".weak " VMLINUX_SYMBOL_STR(x) "\n\t"           \
  27.         ".set  " VMLINUX_SYMBOL_STR(x) ","              \
  28.                  VMLINUX_SYMBOL_STR(sys_ni_syscall))
  29. #endif
  30.  
  31. #ifndef SYSCALL_ALIAS
  32. #define SYSCALL_ALIAS(alias, name) asm(                 \
  33.         ".globl " VMLINUX_SYMBOL_STR(alias) "\n\t"      \
  34.         ".set   " VMLINUX_SYMBOL_STR(alias) ","         \
  35.                   VMLINUX_SYMBOL_STR(name))
  36. #endif
  37.  
  38. #define __page_aligned_data     __section(.data..page_aligned) __aligned(PAGE_SIZE)
  39. #define __page_aligned_bss      __section(.bss..page_aligned) __aligned(PAGE_SIZE)
  40.  
  41. /*
  42.  * For assembly routines.
  43.  *
  44.  * Note when using these that you must specify the appropriate
  45.  * alignment directives yourself
  46.  */
  47. #define __PAGE_ALIGNED_DATA     .section ".data..page_aligned", "aw"
  48. #define __PAGE_ALIGNED_BSS      .section ".bss..page_aligned", "aw"
  49.  
  50. /*
  51.  * This is used by architectures to keep arguments on the stack
  52.  * untouched by the compiler by keeping them live until the end.
  53.  * The argument stack may be owned by the assembly-language
  54.  * caller, not the callee, and gcc doesn't always understand
  55.  * that.
  56.  *
  57.  * We have the return value, and a maximum of six arguments.
  58.  *
  59.  * This should always be followed by a "return ret" for the
  60.  * protection to work (ie no more work that the compiler might
  61.  * end up needing stack temporaries for).
  62.  */
  63. /* Assembly files may be compiled with -traditional .. */
  64. #ifndef __ASSEMBLY__
  65. #ifndef asmlinkage_protect
  66. # define asmlinkage_protect(n, ret, args...)    do { } while (0)
  67. #endif
  68. #endif
  69.  
  70. #ifndef __ALIGN
  71. #define __ALIGN         .align 4,0x90
  72. #define __ALIGN_STR     ".align 4,0x90"
  73. #endif
  74.  
  75. #ifdef __ASSEMBLY__
  76.  
  77. #ifndef LINKER_SCRIPT
  78. #define ALIGN __ALIGN
  79. #define ALIGN_STR __ALIGN_STR
  80.  
  81. #ifndef ENTRY
  82. #define ENTRY(name) \
  83.         .globl name ASM_NL \
  84.         ALIGN ASM_NL \
  85.         name:
  86. #endif
  87. #endif /* LINKER_SCRIPT */
  88.  
  89. #ifndef WEAK
  90. #define WEAK(name)         \
  91.         .weak name ASM_NL   \
  92.         name:
  93. #endif
  94.  
  95. #ifndef END
  96. #define END(name) \
  97.         .size name, .-name
  98. #endif
  99.  
  100. /* If symbol 'name' is treated as a subroutine (gets called, and returns)
  101.  * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
  102.  * static analysis tools such as stack depth analyzer.
  103.  */
  104. #ifndef ENDPROC
  105. #define ENDPROC(name) \
  106.         .type name, @function ASM_NL \
  107.         END(name)
  108. #endif
  109.  
  110. #endif
  111.  
  112. #endif
  113.