include/asm-x86/linkage.h

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