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