sys_call_new.S

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/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors.
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors in the documentation and/or
 *    other materials provided with the distribution.
 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define FAKE_MCOUNT(caller)     pushl caller ; call __mcount ; popl %ecx

.globl _sysCall_new
.text
.code32
_sysCall_new:
  pushl   $2                      /* sizeof "int 0x80" */
  subl    $4,%esp                 /* skip over tf_trapno */
  pushal
  pushl   %ds
  pushl   %es
  pushl   %fs
  /* switch to kernel segments */
  movl    $0x10,%eax
  movl    %eax,%ds
  movl    %eax,%es
  movl    %eax,%fs
  //FAKE_MCOUNT(TF_EIP(%esp))
  call    syscall
  //MEXITCOUNT
  //jmp     doreti
  popl    %fs
  popl    %es
  popl    %ds
  popal
  addl    $8,%esp
  iret       
             
invalidSysCall:
  push %eax
  call invalidCall
  pop %eax
  movl $-1,%eax
  iret

/***
 END
 ***/