_x86_64_syscall.c

/* File: _x86_64_syscall.c

   Copyright (C) 2010 David Hauweele <david@hauweele.net>

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program. If not, see <http://www.gnu.org/licenses/>. */

#include "tlibc.h"

int _syscall_error()
{
  register int rcx __asm__("%rcx");
  __asm__("mov %rax, %rcx; neg %rcx");
  errno = rcx;
  return -1;
}