include/linux/linkage.h

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