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  * 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 /* CONFIG_X86_32 */
  51
  52 #ifdef __ASSEMBLY__
  53
  54 #define GLOBAL(name)    \
  55         .globl name;    \
  56         name:
  57
  58 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16)
  59 #define __ALIGN         .p2align 4, 0x90
  60 #define __ALIGN_STR     __stringify(__ALIGN)
  61 #endif
  62
  63 #endif /* __ASSEMBLY__ */
  64
  65 #endif /* _ASM_X86_LINKAGE_H */
  66