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 #define notrace __attribute__((no_instrument_function))
   8
   9 #ifdef __cplusplus
  10 #define CPP_ASMLINKAGE extern "C"
  11 #else
  12 #define CPP_ASMLINKAGE
  13 #endif
  14
  15 #ifndef asmlinkage
  16 #define asmlinkage CPP_ASMLINKAGE
  17 #endif
  18
  19 #ifndef asmregparm
  20 # define asmregparm
  21 #endif
  22
  23 #define __page_aligned_data     __section(.data.page_aligned) __aligned(PAGE_SIZE)
  24 #define __page_aligned_bss      __section(.bss.page_aligned) __aligned(PAGE_SIZE)
  25
  26 /*
  27  * This is used by architectures to keep arguments on the stack
  28  * untouched by the compiler by keeping them live until the end.
  29  * The argument stack may be owned by the assembly-language
  30  * caller, not the callee, and gcc doesn't always understand
  31  * that.
  32  *
  33  * We have the return value, and a maximum of six arguments.
  34  *
  35  * This should always be followed by a "return ret" for the
  36  * protection to work (ie no more work that the compiler might
  37  * end up needing stack temporaries for).
  38  */
  39 /* Assembly files may be compiled with -traditional .. */
  40 #ifndef __ASSEMBLY__
  41 #ifndef asmlinkage_protect
  42 # define asmlinkage_protect(n, ret, args...)    do { } while (0)
  43 #endif
  44 #endif
  45
  46 #ifndef __ALIGN
  47 #define __ALIGN         .align 4,0x90
  48 #define __ALIGN_STR     ".align 4,0x90"
  49 #endif
  50
  51 #ifdef __ASSEMBLY__
  52
  53 #define ALIGN __ALIGN
  54 #define ALIGN_STR __ALIGN_STR
  55
  56 #ifndef ENTRY
  57 #define ENTRY(name) \
  58   .globl name; \
  59   ALIGN; \
  60   name:
  61 #endif
  62
  63 #ifndef WEAK
  64 #define WEAK(name)         \
  65         .weak name;        \
  66         name:
  67 #endif
  68
  69 #define KPROBE_ENTRY(name) \
  70   .pushsection .kprobes.text, "ax"; \
  71   ENTRY(name)
  72
  73 #define KPROBE_END(name) \
  74   END(name);             \
  75   .popsection
  76
  77 #ifndef END
  78 #define END(name) \
  79   .size name, .-name
  80 #endif
  81
  82 /* If symbol 'name' is treated as a subroutine (gets called, and returns)
  83  * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
  84  * static analysis tools such as stack depth analyzer.
  85  */
  86 #ifndef ENDPROC
  87 #define ENDPROC(name) \
  88   .type name, @function; \
  89   END(name)
  90 #endif
  91
  92 #endif
  93
  94 #define NORET_TYPE    /**/
  95 #define ATTRIB_NORET  __attribute__((noreturn))
  96 #define NORET_AND     noreturn,
  97
  98 #endif