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 * This is used by architectures to keep arguments on the stack
  26 * untouched by the compiler by keeping them live until the end.
  27 * The argument stack may be owned by the assembly-language
  28 * caller, not the callee, and gcc doesn't always understand
  29 * that.
  30 *
  31 * We have the return value, and a maximum of six arguments.
  32 *
  33 * This should always be followed by a "return ret" for the
  34 * protection to work (ie no more work that the compiler might
  35 * end up needing stack temporaries for).
  36 */
  37/* Assembly files may be compiled with -traditional .. */
  38#ifndef __ASSEMBLY__
  39#ifndef asmlinkage_protect
  40# define asmlinkage_protect(n, ret, args...)    do { } while (0)
  41#endif
  42#endif
  43
  44#ifndef __ALIGN
  45#define __ALIGN         .align 4,0x90
  46#define __ALIGN_STR     ".align 4,0x90"
  47#endif
  48
  49#ifdef __ASSEMBLY__
  50
  51#define ALIGN __ALIGN
  52#define ALIGN_STR __ALIGN_STR
  53
  54#ifndef ENTRY
  55#define ENTRY(name) \
  56  .globl name; \
  57  ALIGN; \
  58  name:
  59#endif
  60
  61#ifndef WEAK
  62#define WEAK(name)         \
  63        .weak name;        \
  64        name:
  65#endif
  66
  67#define KPROBE_ENTRY(name) \
  68  .pushsection .kprobes.text, "ax"; \
  69  ENTRY(name)
  70
  71#define KPROBE_END(name) \
  72  END(name);             \
  73  .popsection
  74
  75#ifndef END
  76#define END(name) \
  77  .size name, .-name
  78#endif
  79
  80/* If symbol 'name' is treated as a subroutine (gets called, and returns)
  81 * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
  82 * static analysis tools such as stack depth analyzer.
  83 */
  84#ifndef ENDPROC
  85#define ENDPROC(name) \
  86  .type name, @function; \
  87  END(name)
  88#endif
  89
  90#endif
  91
  92#define NORET_TYPE    /**/
  93#define ATTRIB_NORET  __attribute__((noreturn))
  94#define NORET_AND     noreturn,
  95
  96#endif
  97