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