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