lib/libc/i386/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  * 4. 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  *      @(#)SYS.h       5.5 (Berkeley) 5/7/91
  33  * $FreeBSD: src/lib/libc/i386/SYS.h,v 1.27 2008/11/02 01:28:47 peter Exp $
  34  * $DragonFly: src/lib/libc/i386/SYS.h,v 1.7 2006/07/27 00:43:42 corecode Exp $
  35  */
  36
  37 #include <sys/syscall.h>
  38 #include <machine/asm.h>
  39
  40 #define SYSCALL(x)      2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \
  41                         ENTRY(__CONCAT(__sys_,x));                      \
  42                         .weak CNAME(x);                                 \
  43                         .set CNAME(x),CNAME(__CONCAT(__sys_,x));        \
  44                         .weak CNAME(__CONCAT(_,x));                     \
  45                         .set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
  46                         mov __CONCAT($SYS_,x),%eax; KERNCALL; jb 2b
  47
  48 #define RSYSCALL(x)     SYSCALL(x); ret; END(__CONCAT(__sys_,x))
  49
  50 #define PSEUDO(x)       2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \
  51                         ENTRY(__CONCAT(__sys_,x));                      \
  52                         .weak CNAME(__CONCAT(_,x));                     \
  53                         .set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
  54                         mov __CONCAT($SYS_,x),%eax; KERNCALL; jb 2b; ret; \
  55                         END(__CONCAT(__sys_,x))
  56
  57 /* gas messes up offset -- although we don't currently need it, do for BCS */
  58 #define LCALL(x,y)      .byte 0x9a ; .long y; .word x
  59
  60 #define KERNCALL        int $0x80