src/arch/alpha/syscallreturn.hh

   1 /*
   2  * Copyright (c) 2003-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Steve Reinhardt
  29  *          Gabe Black
  30  */
  31
  32 #ifndef __ARCH_ALPHA_SYSCALLRETURN_HH__
  33 #define __ARCH_ALPHA_SYSCALLRETURN_HH__
  34
  35 #include "cpu/thread_context.hh"
  36 #include "sim/syscallreturn.hh"
  37
  38 namespace AlphaISA {
  39
  40 static inline void
  41 setSyscallReturn(SyscallReturn return_value, ThreadContext *tc)
  42 {
  43     // check for error condition.  Alpha syscall convention is to
  44     // indicate success/failure in reg a3 (r19) and put the
  45     // return value itself in the standard return value reg (v0).
  46     if (return_value.successful()) {
  47         // no error
  48         tc->setIntReg(SyscallSuccessReg, 0);
  49         tc->setIntReg(ReturnValueReg, return_value.value());
  50     } else {
  51         // got an error, return details
  52         tc->setIntReg(SyscallSuccessReg, (IntReg)-1);
  53         tc->setIntReg(ReturnValueReg, -return_value.value());
  54     }
  55 }
  56
  57 } // namespace AlphaISA
  58
  59 #endif // __ARCH_ALPHA_SYSCALLRETURN_HH__