arch/x86/include/asm/linkage.h

   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  * For syscalls that need a pointer to the pt_regs struct (ie. fork).
  22  * The regs pointer is passed in %eax as the first argument.  The
  23  * remaining function arguments remain on the stack.
  24  */
  25 #define ptregscall __attribute__((regparm(1)))
  26
  27 /*
  28  * Make sure the compiler doesn't do anything stupid with the
  29  * arguments on the stack - they are owned by the *caller*, not
  30  * the callee. This just fools gcc into not spilling into them,
  31  * and keeps it from doing tailcall recursion and/or using the
  32  * stack slots for temporaries, since they are live and "used"
  33  * all the way to the end of the function.
  34  *
  35  * NOTE! On x86-64, all the arguments are in registers, so this
  36  * only matters on a 32-bit kernel.
  37  */
  38 #define asmlinkage_protect(n, ret, args...) \
  39         __asmlinkage_protect##n(ret, ##args)
  40 #define __asmlinkage_protect_n(ret, args...) \
  41         __asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
  42 #define __asmlinkage_protect0(ret) \
  43         __asmlinkage_protect_n(ret)
  44 #define __asmlinkage_protect1(ret, arg1) \
  45         __asmlinkage_protect_n(ret, "g" (arg1))
  46 #define __asmlinkage_protect2(ret, arg1, arg2) \
  47         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2))
  48 #define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
  49         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3))
  50 #define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
  51         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
  52                               "g" (arg4))
  53 #define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
  54         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
  55                               "g" (arg4), "g" (arg5))
  56 #define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
  57         __asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
  58                               "g" (arg4), "g" (arg5), "g" (arg6))
  59
  60 #endif
  61
  62 #ifdef CONFIG_X86_ALIGNMENT_16
  63 #define __ALIGN .align 16,0x90
  64 #define __ALIGN_STR ".align 16,0x90"
  65 #endif
  66
  67 /*
  68  * to check ENTRY_X86/END_X86 and
  69  * KPROBE_ENTRY_X86/KPROBE_END_X86
  70  * unbalanced-missed-mixed appearance
  71  */
  72 #define __set_entry_x86         .set ENTRY_X86_IN, 0
  73 #define __unset_entry_x86       .set ENTRY_X86_IN, 1
  74 #define __set_kprobe_x86        .set KPROBE_X86_IN, 0
  75 #define __unset_kprobe_x86      .set KPROBE_X86_IN, 1
  76
  77 #define __macro_err_x86 .error "ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed"
  78
  79 #define __check_entry_x86       \
  80         .ifdef ENTRY_X86_IN;    \
  81         .ifeq ENTRY_X86_IN;     \
  82         __macro_err_x86;        \
  83         .abort;                 \
  84         .endif;                 \
  85         .endif
  86
  87 #define __check_kprobe_x86      \
  88         .ifdef KPROBE_X86_IN;   \
  89         .ifeq KPROBE_X86_IN;    \
  90         __macro_err_x86;        \
  91         .abort;                 \
  92         .endif;                 \
  93         .endif
  94
  95 #define __check_entry_kprobe_x86        \
  96         __check_entry_x86;              \
  97         __check_kprobe_x86
  98
  99 #define ENTRY_KPROBE_FINAL_X86 __check_entry_kprobe_x86
 100
 101 #define ENTRY_X86(name)                 \
 102         __check_entry_kprobe_x86;       \
 103         __set_entry_x86;                \
 104         .globl name;                    \
 105         __ALIGN;                        \
 106         name:
 107
 108 #define END_X86(name)                   \
 109         __unset_entry_x86;              \
 110         __check_entry_kprobe_x86;       \
 111         .size name, .-name
 112
 113 #define KPROBE_ENTRY_X86(name)          \
 114         __check_entry_kprobe_x86;       \
 115         __set_kprobe_x86;               \
 116         .pushsection .kprobes.text, "ax"; \
 117         .globl name;                    \
 118         __ALIGN;                        \
 119         name:
 120
 121 #define KPROBE_END_X86(name)            \
 122         __unset_kprobe_x86;             \
 123         __check_entry_kprobe_x86;       \
 124         .size name, .-name;             \
 125         .popsection
 126
 127 #endif /* _ASM_X86_LINKAGE_H */
 128