src/arch/sparc/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: Gabe Black
  29  */
  30
  31 #ifndef __ARCH_SPARC_SYSCALLRETURN_HH__
  32 #define __ARCH_SPARC_SYSCALLRETURN_HH__
  33
  34 #include <inttypes.h>
  35
  36 #include "sim/syscallreturn.hh"
  37 #include "arch/sparc/regfile.hh"
  38 #include "cpu/thread_context.hh"
  39
  40 namespace SparcISA
  41 {
  42     static inline void setSyscallReturn(SyscallReturn return_value,
  43             ThreadContext * tc)
  44     {
  45         // check for error condition.  SPARC syscall convention is to
  46         // indicate success/failure in reg the carry bit of the ccr
  47         // and put the return value itself in the standard return value reg ().
  48         if (return_value.successful()) {
  49             // no error, clear XCC.C
  50             tc->setIntReg(NumIntArchRegs + 2,
  51                     tc->readIntReg(NumIntArchRegs + 2) & 0xEE);
  52             //tc->setMiscRegNoEffect(MISCREG_CCR, tc->readMiscRegNoEffect(MISCREG_CCR) & 0xEE);
  53             IntReg val = return_value.value();
  54             if (bits(tc->readMiscRegNoEffect(
  55                             SparcISA::MISCREG_PSTATE), 3, 3)) {
  56                 val = bits(val, 31, 0);
  57             }
  58             tc->setIntReg(ReturnValueReg, val);
  59         } else {
  60             // got an error, set XCC.C
  61             tc->setIntReg(NumIntArchRegs + 2,
  62                     tc->readIntReg(NumIntArchRegs + 2) | 0x11);
  63             //tc->setMiscRegNoEffect(MISCREG_CCR, tc->readMiscRegNoEffect(MISCREG_CCR) | 0x11);
  64             IntReg val = -return_value.value();
  65             if (bits(tc->readMiscRegNoEffect(
  66                             SparcISA::MISCREG_PSTATE), 3, 3)) {
  67                 val = bits(val, 31, 0);
  68             }
  69             tc->setIntReg(ReturnValueReg, val);
  70         }
  71     }
  72 };
  73
  74 #endif