x64/syscall-stubs.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef SERVICE
#error syscall-stubs.h requires SERVICE to be defined
#endif
#ifndef SERVICE_ERROR
#error syscall-stubs.h requires SERVICE_ERROR to be defined
#endif
#ifndef SERVICE_INIT
#error syscall-stubs.h requires SERVICE_INIT to be defined
#endif
 
static long syscall6(long function, long p1, long p2, long p3, long p4, long p5, long p6) {
  long eax = ((SERVICE & 0xFFFF) << 16) | (function & 0xFFFF);
  long ret;
  long err;
  register long p5_r __asm__("r8") = p5;
  register long p6_r __asm__("r9") = p6;
 
  SERVICE_INIT;
 
  __asm__ __volatile__("syscall"
                       : "=a"(ret), "=b"(err)
                       : "0"(eax), "1"(p1), "d"(p2), "S"(p3), "D"(p4), "r"(p5_r), "r"(p6_r)
                       : "rcx", "r11", "memory");
 
  if (err) {
    SERVICE_ERROR = err;
  }
  return ret;
}
 
static long syscall6_err(long function, long p1, long p2, long p3, long p4, long p5, long p6,
                         long* err) {
  long eax = ((SERVICE & 0xFFFF) << 16) | (function & 0xFFFF);
  long ret;
  register long p5_r __asm__("r8") = p5;
  register long p6_r __asm__("r9") = p6;
 
  *err = 0;
  __asm__ __volatile__("syscall"
                       : "=a"(ret), "=b"(*err)
                       : "0"(eax), "1"(p1), "d"(p2), "S"(p3), "D"(p4), "r"(p5_r), "r"(p6_r)
                       : "rcx", "r11", "memory");
 
  return ret;
}
 
static long syscall6_for_service_err(long service, long function, long p1, long p2, long p3,
                                     long p4, long p5, long p6, long* err) {
  long eax = ((service & 0xFFFF) << 16) | (function & 0xFFFF);
  long ret;
  register long p4_r __asm__("r10") = p4;
  register long p5_r __asm__("r8") = p5;
  register long p6_r __asm__("r9") = p6;
 
  *err = 0;
  __asm__ __volatile__("syscall"
                       : "=a"(ret)
                       : "0"(eax), "D"(p1), "S"(p2), "d"(p3), "r"(p4_r), "r"(p5_r), "r"(p6_r)
                       : "rcx", "r11", "memory");
 
  return ret;
}
 
static long syscall0(long function) {
  return syscall6(function, 0, 0, 0, 0, 0, 0);
}
 
static long syscall1(long function, long p1) {
  return syscall6(function, p1, 0, 0, 0, 0, 0);
}
 
static long syscall2(long function, long p1, long p2) {
  return syscall6(function, p1, p2, 0, 0, 0, 0);
}
 
static long syscall3(long function, long p1, long p2, long p3) {
  return syscall6(function, p1, p2, p3, 0, 0, 0);
}
 
static long syscall4(long function, long p1, long p2, long p3, long p4) {
  return syscall6(function, p1, p2, p3, p4, 0, 0);
}
 
static long syscall5(long function, long p1, long p2, long p3, long p4, long p5) {
  return syscall6(function, p1, p2, p3, p4, p5, 0);
}