lib/libc/amd64/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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)SYS.h       5.5 (Berkeley) 5/7/91
  37  * $FreeBSD: src/lib/libc/amd64/SYS.h,v 1.26 2003/05/24 17:35:23 peter Exp $
  38  * $DragonFly: src/lib/libc/amd64/SYS.h,v 1.2 2006/07/27 00:43:42 corecode Exp $
  39  */
  40
  41 #include <sys/syscall.h>
  42 #include <machine/asm.h>
  43
  44 #ifdef PIC
  45 #define SYSCALL(x)      2: movq PIC_GOT(HIDENAME(cerror)),%rcx;         \
  46                         jmp *%rcx;                                      \
  47                         ENTRY(__CONCAT(__sys_,x));                      \
  48                         .weak CNAME(x);                                 \
  49                         .set CNAME(x),CNAME(__CONCAT(__sys_,x));        \
  50                         .weak CNAME(__CONCAT(_,x));                     \
  51                         .set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
  52                         mov __CONCAT($SYS_,x),%rax; KERNCALL; jb 2b
  53 #else
  54 #define SYSCALL(x)      2: jmp HIDENAME(cerror);                        \
  55                         ENTRY(__CONCAT(__sys_,x));                      \
  56                         .weak CNAME(x);                                 \
  57                         .set CNAME(x),CNAME(__CONCAT(__sys_,x));        \
  58                         .weak CNAME(__CONCAT(_,x));                     \
  59                         .set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
  60                         mov __CONCAT($SYS_,x),%rax; KERNCALL; jb 2b
  61 #endif
  62
  63 #define RSYSCALL(x)     SYSCALL(x); ret
  64
  65 #define PSEUDO(x,y)     ENTRY(__CONCAT(__sys_,x));                      \
  66                         .weak CNAME(x);                                 \
  67                         .set CNAME(x),CNAME(__CONCAT(__sys_,x));        \
  68                         .weak CNAME(__CONCAT(_,x));                     \
  69                         .set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
  70                         mov __CONCAT($SYS_,y),%rax; KERNCALL; ret
  71
  72 #define KERNCALL        movq %rcx, %r10; syscall