src/arch/arm/freebsd/process.hh

   1 /*
   2  * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
   3  * All rights reserved.
   4  *
   5  * This software was developed by the University of Cambridge Computer
   6  * Laboratory as part of the CTSRD Project, with support from the UK Higher
   7  * Education Innovation Fund (HEIF).
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions are
  11  * met: redistributions of source code must retain the above copyright
  12  * notice, this list of conditions and the following disclaimer;
  13  * redistributions in binary form must reproduce the above copyright
  14  * notice, this list of conditions and the following disclaimer in the
  15  * documentation and/or other materials provided with the distribution;
  16  * neither the name of the copyright holders nor the names of its
  17  * contributors may be used to endorse or promote products derived from
  18  * this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef __ARCH_ARM_FREEBSD_PROCESS_HH__
  34 #define __ARCH_ARM_FREEBSD_PROCESS_HH__
  35
  36 #include <vector>
  37
  38 #include "arch/arm/process.hh"
  39
  40 class ArmFreebsdProcessBits
  41 {
  42   public:
  43     struct SyscallABI {};
  44 };
  45
  46 namespace GuestABI
  47 {
  48
  49 template <typename ABI>
  50 struct Result<ABI, SyscallReturn,
  51     typename std::enable_if_t<std::is_base_of<
  52         ArmFreebsdProcessBits::SyscallABI, ABI>::value>>
  53 {
  54     static void
  55     store(ThreadContext *tc, const SyscallReturn &ret)
  56     {
  57         if (ret.suppressed() || ret.needsRetry())
  58             return;
  59
  60         RegVal val;
  61         if (ret.successful()) {
  62             tc->setCCReg(ArmISA::CCREG_C, 0);
  63             val = ret.returnValue();
  64         } else {
  65             tc->setCCReg(ArmISA::CCREG_C, 1);
  66             val = ret.encodedValue();
  67         }
  68         tc->setIntReg(ArmISA::ReturnValueReg, val);
  69         if (ret.count() > 1)
  70             tc->setIntReg(ArmISA::SyscallPseudoReturnReg, ret.value2());
  71     }
  72 };
  73
  74 } // namespace GuestABI
  75
  76 /// A process with emulated Arm/Freebsd syscalls.
  77 class ArmFreebsdProcess32 : public ArmProcess32, public ArmFreebsdProcessBits
  78 {
  79   public:
  80     ArmFreebsdProcess32(const ProcessParams &params,
  81                         ::Loader::ObjectFile *objFile, ::Loader::Arch _arch);
  82
  83     void initState() override;
  84
  85     void syscall(ThreadContext *tc) override;
  86
  87     /// A page to hold "kernel" provided functions. The name might be wrong.
  88     static const Addr commPage;
  89
  90     struct SyscallABI : public ArmProcess32::SyscallABI,
  91                         public ArmFreebsdProcessBits::SyscallABI
  92     {};
  93 };
  94
  95 /// A process with emulated Arm/Freebsd syscalls.
  96 class ArmFreebsdProcess64 : public ArmProcess64, public ArmFreebsdProcessBits
  97 {
  98   public:
  99     ArmFreebsdProcess64(const ProcessParams &params,
 100                         ::Loader::ObjectFile *objFile, ::Loader::Arch _arch);
 101
 102     void initState() override;
 103     void syscall(ThreadContext *tc) override;
 104
 105     struct SyscallABI : public ArmProcess64::SyscallABI,
 106                         public ArmFreebsdProcessBits::SyscallABI
 107     {};
 108 };
 109
 110 #endif // __ARCH_ARM_FREEBSD_PROCESS_HH__