lib/libc/arch/i386/SYS.h

   1 /*      $NetBSD: SYS.h,v 1.23 2008/04/28 20:22:56 martin Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Andrew Doran.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*-
  33  * Copyright (c) 1990 The Regents of the University of California.
  34  * All rights reserved.
  35  *
  36  * This code is derived from software contributed to Berkeley by
  37  * William Jolitz.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  * 3. Neither the name of the University nor the names of its contributors
  48  *    may be used to endorse or promote products derived from this software
  49  *    without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  61  * SUCH DAMAGE.
  62  *
  63  *      from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
  64  */
  65
  66 #include <machine/asm.h>
  67 #include <sys/syscall.h>
  68
  69 #ifdef __STDC__
  70 #define _SYSNAM(x)      $(SYS_ ## x)
  71 #else
  72 #define _SYSNAM(x)      $(SYS_/**/x)
  73 #endif
  74
  75 #define OSYSTRAP(x)                     \
  76         movl _SYSNAM(x),%eax            ;\
  77         int $0x80
  78
  79 #ifdef I686_LIBC
  80 #define SYSTRAP(x)                      \
  81         pushl   %ebx                    ;\
  82         movl    _SYSNAM(x),%eax         ;\
  83         movl    $123f,%edx              ;\
  84         movl    %esp,%ecx               ;\
  85         sysenter                        ;\
  86 123:    movl    %ebx,%edx               ;\
  87         popl    %ebx
  88 #else   /* I686_LIBC */
  89 #define SYSTRAP(x)      OSYSTRAP(x)
  90 #endif  /* I686_LIBC */
  91
  92 #ifdef __ELF__
  93 #define CERROR          _C_LABEL(__cerror)
  94 #define CURBRK          _C_LABEL(__curbrk)
  95 #else
  96 #define CERROR          _ASM_LABEL(cerror)
  97 #define CURBRK          _ASM_LABEL(curbrk)
  98 #endif
  99
 100 #define _SYSCALL_NOERROR(x,y)                                           \
 101         ENTRY(x);                                                       \
 102         SYSTRAP(y)
 103
 104 #ifdef PIC
 105 #define _SYSCALL_ERR                                                    \
 106         PIC_PROLOGUE;                                                   \
 107         mov PIC_GOT(CERROR), %ecx;                                      \
 108         PIC_EPILOGUE;                                                   \
 109         jmp *%ecx
 110 #else
 111 #define _SYSCALL_ERR                                                    \
 112         jmp CERROR
 113 #endif
 114
 115 #define _SYSCALL(x,y)                                                   \
 116         .text; _ALIGN_TEXT;                                             \
 117         2: _SYSCALL_ERR;                                                \
 118         _SYSCALL_NOERROR(x,y);                                          \
 119         jc 2b
 120
 121 #define SYSCALL_NOERROR(x)                                              \
 122         _SYSCALL_NOERROR(x,x)
 123
 124 #define SYSCALL(x)                                                      \
 125         _SYSCALL(x,x)
 126
 127 #define PSEUDO_NOERROR(x,y)                                             \
 128         _SYSCALL_NOERROR(x,y);                                          \
 129         ret
 130
 131 #define PSEUDO(x,y)                                                     \
 132         _SYSCALL_NOERROR(x,y);                                          \
 133         jc 2f;                                                          \
 134         ret;                                                            \
 135         2: _SYSCALL_ERR
 136
 137 #define RSYSCALL_NOERROR(x)                                             \
 138         PSEUDO_NOERROR(x,x)
 139
 140 #define RSYSCALL(x)                                                     \
 141         PSEUDO(x,x)
 142
 143 #ifdef WEAK_ALIAS
 144 #define WSYSCALL(weak,strong)                                           \
 145         WEAK_ALIAS(weak,strong);                                        \
 146         PSEUDO(strong,weak)
 147 #else
 148 #define WSYSCALL(weak,strong)                                           \
 149         PSEUDO(weak,weak)
 150 #endif
 151
 152         .globl  CERROR