usr/src/lib/libc/i386/sys/forkallx.s

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27         .file   "forkallx.s"
  28
  29 #include "SYS.h"
  30
  31 /*
  32  * pid = __forkallx(flags);
  33  *
  34  * syscall trap: forksys(1, flags)
  35  *
  36  * From the syscall:
  37  * %edx == 0 in parent process, %edx = 1 in child process.
  38  * %eax == pid of child in parent, %eax == pid of parent in child.
  39  *
  40  * The child gets a zero return value.
  41  * The parent gets the pid of the child.
  42  */
  43
  44         ENTRY(__forkallx)
  45         popl    %ecx
  46         pushl   $1
  47         pushl   %ecx
  48         SYSTRAP_2RVALS(forksys)
  49         popl    %ecx
  50         movl    %ecx, 0(%esp)
  51         SYSCERROR
  52         testl   %edx, %edx
  53         jz      1f              /* jump if parent */
  54         xorl    %eax, %eax      /* child, return (0) */
  55 1:
  56         RET
  57         SET_SIZE(__forkallx)