include/linux/linkage.h

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