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   1 #ifndef _ASM_X86_LINKAGE_H
   2 #define _ASM_X86_LINKAGE_H
   3
   4 #undef notrace
   5 #define notrace __attribute__((no_instrument_function))
   6
   7 #ifdef CONFIG_X86_64
   8 #define __ALIGN .p2align 4,,15
   9 #define __ALIGN_STR ".p2align 4,,15"
  10 #endif
  11
  12 #ifdef CONFIG_X86_32
  13 #define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
  14 /*
  15  * For 32-bit UML - mark functions implemented in assembly that use
  16  * regparm input parameters:
  17  */
  18 #define asmregparm __attribute__((regparm(3)))
  19
  20 /*
  21  * Make sure the compiler doesn't do anything stupid with the
  22  * arguments on the stack - they are owned by the *caller*, not
  23  * the callee. This just fools gcc into not spilling into them,
  24  * and keeps it from doing tailcall recursion and/or using the
  25  * stack slots for temporaries, since they are live and "used"
  26  * all the way to the end of the function.
  27  *
  28  * NOTE! On x86-64, all the arguments are in registers, so this
  29  * only matters on a 32-bit kernel.
  30  */
  31 #define asmlinkage_protect(n, ret, args...) \
  32         __asmlinkage_protect##n(ret, ##args)
  33 #define __asmlinkage_protect_n(ret, args...) \
  34         __asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
  35 #define __asmlinkage_protect0(ret) \
  36         __asmlinkage_protect_n(ret)
  37 #define __asmlinkage_protect1(ret, arg1) \
  38         __asmlinkage_protect_n(ret, "g" (arg1))
  39 #define __asmlinkage_protect2(ret, arg1, arg2) \
  40         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2))
  41 #define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
  42         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3))
  43 #define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
  44         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
  45                               "g" (arg4))
  46 #define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
  47         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
  48                               "g" (arg4), "g" (arg5))
  49 #define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
  50         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
  51                               "g" (arg4), "g" (arg5), "g" (arg6))
  52
  53 #endif
  54
  55 #ifdef CONFIG_X86_ALIGNMENT_16
  56 #define __ALIGN .align 16,0x90
  57 #define __ALIGN_STR ".align 16,0x90"
  58 #endif
  59
  60 /*
  61  * to check ENTRY_X86/END_X86 and
  62  * KPROBE_ENTRY_X86/KPROBE_END_X86
  63  * unbalanced-missed-mixed appearance
  64  */
  65 #define __set_entry_x86         .set ENTRY_X86_IN, 0
  66 #define __unset_entry_x86       .set ENTRY_X86_IN, 1
  67 #define __set_kprobe_x86        .set KPROBE_X86_IN, 0
  68 #define __unset_kprobe_x86      .set KPROBE_X86_IN, 1
  69
  70 #define __macro_err_x86 .error "ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed"
  71
  72 #define __check_entry_x86       \
  73         .ifdef ENTRY_X86_IN;    \
  74         .ifeq ENTRY_X86_IN;     \
  75         __macro_err_x86;        \
  76         .abort;                 \
  77         .endif;                 \
  78         .endif
  79
  80 #define __check_kprobe_x86      \
  81         .ifdef KPROBE_X86_IN;   \
  82         .ifeq KPROBE_X86_IN;    \
  83         __macro_err_x86;        \
  84         .abort;                 \
  85         .endif;                 \
  86         .endif
  87
  88 #define __check_entry_kprobe_x86        \
  89         __check_entry_x86;              \
  90         __check_kprobe_x86
  91
  92 #define ENTRY_KPROBE_FINAL_X86 __check_entry_kprobe_x86
  93
  94 #define ENTRY_X86(name)                 \
  95         __check_entry_kprobe_x86;       \
  96         __set_entry_x86;                \
  97         .globl name;                    \
  98         __ALIGN;                        \
  99         name:
 100
 101 #define END_X86(name)                   \
 102         __unset_entry_x86;              \
 103         __check_entry_kprobe_x86;       \
 104         .size name, .-name
 105
 106 #define KPROBE_ENTRY_X86(name)          \
 107         __check_entry_kprobe_x86;       \
 108         __set_kprobe_x86;               \
 109         .pushsection .kprobes.text, "ax"; \
 110         .globl name;                    \
 111         __ALIGN;                        \
 112         name:
 113
 114 #define KPROBE_END_X86(name)            \
 115         __unset_kprobe_x86;             \
 116         __check_entry_kprobe_x86;       \
 117         .size name, .-name;             \
 118         .popsection
 119
 120 #endif /* _ASM_X86_LINKAGE_H */
 121