lib/libc/arch/x86_64/SYS.h

   1 /*-
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * William Jolitz.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
  33  *      $NetBSD: SYS.h,v 1.10 2007/11/23 07:36:05 dsl Exp $
  34  */
  35
  36 #include <machine/asm.h>
  37 #include <sys/syscall.h>
  38
  39 #ifdef __STDC__
  40 #define SYSTRAP(x)      movl $(SYS_ ## x),%eax; movq %rcx, %r10; syscall
  41 #else
  42 #define SYSTRAP(x)      movl $(SYS_/**/x),%eax; movq %rcx, %r10; syscall
  43 #endif
  44
  45 #define CERROR          _C_LABEL(__cerror)
  46 #define CURBRK          _C_LABEL(__curbrk)
  47
  48 #define _SYSCALL_NOERROR(x,y)                                           \
  49         ENTRY(x);                                                       \
  50         SYSTRAP(y)
  51
  52 #ifdef PIC
  53 #define _SYSCALL_ERR                                                    \
  54         mov PIC_GOT(CERROR), %rcx;                                      \
  55         jmp *%rcx
  56 #else
  57 #define _SYSCALL_ERR                                                    \
  58         jmp CERROR
  59 #endif
  60
  61 #define _SYSCALL(x,y)                                                   \
  62         .text; _ALIGN_TEXT;                                             \
  63         2: _SYSCALL_ERR;                                                \
  64         _SYSCALL_NOERROR(x,y);                                          \
  65         jc 2b
  66
  67 #define SYSCALL_NOERROR(x)                                              \
  68         _SYSCALL_NOERROR(x,x)
  69
  70 #define SYSCALL(x)                                                      \
  71         _SYSCALL(x,x)
  72
  73 #define PSEUDO_NOERROR(x,y)                                             \
  74         _SYSCALL_NOERROR(x,y);                                          \
  75         ret
  76
  77 #define PSEUDO(x,y)                                                     \
  78         _SYSCALL_NOERROR(x,y);                                          \
  79         jc 2f;                                                          \
  80         ret;                                                            \
  81         2: _SYSCALL_ERR
  82
  83 #define RSYSCALL_NOERROR(x)                                             \
  84         PSEUDO_NOERROR(x,x)
  85
  86 #define RSYSCALL(x)                                                     \
  87         PSEUDO(x,x)
  88
  89 #define WSYSCALL(weak,strong)                                           \
  90         WEAK_ALIAS(weak,strong);                                        \
  91         PSEUDO(strong,weak)
  92
  93         .globl  CERROR