LXR linux/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
 100