LXR linux/arch/x86/include/asm/linkage.h

   1#ifndef _ASM_X86_LINKAGE_H
   2#define _ASM_X86_LINKAGE_H
   3
   4#include <linux/stringify.h>
   5
   6#undef notrace
   7#define notrace __attribute__((no_instrument_function))
   8
   9#ifdef CONFIG_X86_32
  10#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
  11
  12/*
  13 * Make sure the compiler doesn't do anything stupid with the
  14 * arguments on the stack - they are owned by the *caller*, not
  15 * the callee. This just fools gcc into not spilling into them,
  16 * and keeps it from doing tailcall recursion and/or using the
  17 * stack slots for temporaries, since they are live and "used"
  18 * all the way to the end of the function.
  19 *
  20 * NOTE! On x86-64, all the arguments are in registers, so this
  21 * only matters on a 32-bit kernel.
  22 */
  23#define asmlinkage_protect(n, ret, args...) \
  24        __asmlinkage_protect##n(ret, ##args)
  25#define __asmlinkage_protect_n(ret, args...) \
  26        __asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
  27#define __asmlinkage_protect0(ret) \
  28        __asmlinkage_protect_n(ret)
  29#define __asmlinkage_protect1(ret, arg1) \
  30        __asmlinkage_protect_n(ret, "m" (arg1))
  31#define __asmlinkage_protect2(ret, arg1, arg2) \
  32        __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2))
  33#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
  34        __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3))
  35#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
  36        __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
  37                              "m" (arg4))
  38#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
  39        __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
  40                              "m" (arg4), "m" (arg5))
  41#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
  42        __asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
  43                              "m" (arg4), "m" (arg5), "m" (arg6))
  44
  45#endif /* CONFIG_X86_32 */
  46
  47#ifdef __ASSEMBLY__
  48
  49#define GLOBAL(name)    \
  50        .globl name;    \
  51        name:
  52
  53#if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16)
  54#define __ALIGN         .p2align 4, 0x90
  55#define __ALIGN_STR     __stringify(__ALIGN)
  56#endif
  57
  58#endif /* __ASSEMBLY__ */
  59
  60#endif /* _ASM_X86_LINKAGE_H */
  61
  62