3f722b991f
When accessing arguments for a syscall, the position of an argument depends on the policies of the ISA, how much space preceding arguments took up, and the "alignment" of the index for this particular argument into the number of possible storate locations. This change adjusts getSyscallArg to take its index parameter by reference instead of value and to adjust it to point to the possible location of the next argument on the stack, basically just after the current one. This way, the rules for the new argument can be applied locally without knowing about other arguments since those have already been taken into account implicitly. All system calls have also been changed to reflect the new interface. In a number of cases this made the implementation clearer since it encourages arguments to be collected in one place in order and then used as necessary later, as opposed to scattering them throughout the function or using them in place in long expressions. It also discourages using getSyscallArg over and over to retrieve the same value when a temporary would do the job.
140 lines
5.1 KiB
C++
140 lines
5.1 KiB
C++
/*
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* Copyright (c) 2007 The Hewlett-Packard Development Company
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* All rights reserved.
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*
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* Redistribution and use of this software in source and binary forms,
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* with or without modification, are permitted provided that the
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* following conditions are met:
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*
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* The software must be used only for Non-Commercial Use which means any
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* use which is NOT directed to receiving any direct monetary
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* compensation for, or commercial advantage from such use. Illustrative
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* examples of non-commercial use are academic research, personal study,
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* teaching, education and corporate research & development.
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* Illustrative examples of commercial use are distributing products for
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* commercial advantage and providing services using the software for
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* commercial advantage.
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*
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* If you wish to use this software or functionality therein that may be
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* covered by patents for commercial use, please contact:
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* Director of Intellectual Property Licensing
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* Office of Strategy and Technology
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* Hewlett-Packard Company
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* 1501 Page Mill Road
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* Palo Alto, California 94304
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer. Redistributions
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* in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution. Neither the name of
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* the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission. No right of
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* sublicense is granted herewith. Derivatives of the software and
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* output created using the software may be prepared, but only for
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* Non-Commercial Uses. Derivatives of the software may be shared with
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* others provided: (i) the others agree to abide by the list of
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* conditions herein which includes the Non-Commercial Use restrictions;
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* and (ii) such Derivatives of the software include the above copyright
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* notice to acknowledge the contribution from this software where
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* applicable, this list of conditions and the disclaimer below.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Gabe Black
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*/
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#ifndef __ARCH_X86_PROCESS_HH__
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#define __ARCH_X86_PROCESS_HH__
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#include <string>
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#include <vector>
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#include "sim/process.hh"
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class SyscallDesc;
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namespace X86ISA
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{
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class X86LiveProcess : public LiveProcess
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{
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protected:
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Addr _gdtStart;
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Addr _gdtSize;
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SyscallDesc *syscallDescs;
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const int numSyscallDescs;
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X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile,
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SyscallDesc *_syscallDescs, int _numSyscallDescs);
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template<class IntType>
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void argsInit(int pageSize,
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std::vector<AuxVector<IntType> > extraAuxvs);
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public:
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Addr gdtStart()
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{ return _gdtStart; }
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Addr gdtSize()
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{ return _gdtSize; }
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SyscallDesc* getDesc(int callnum);
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void setSyscallReturn(ThreadContext *tc, SyscallReturn return_value);
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};
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class X86_64LiveProcess : public X86LiveProcess
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{
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protected:
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X86_64LiveProcess(LiveProcessParams *params, ObjectFile *objFile,
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SyscallDesc *_syscallDescs, int _numSyscallDescs);
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public:
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void argsInit(int intSize, int pageSize);
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void startup();
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X86ISA::IntReg getSyscallArg(ThreadContext *tc, int &i);
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void setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val);
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};
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class I386LiveProcess : public X86LiveProcess
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{
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protected:
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I386LiveProcess(LiveProcessParams *params, ObjectFile *objFile,
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SyscallDesc *_syscallDescs, int _numSyscallDescs);
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class VSyscallPage
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{
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public:
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Addr base;
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Addr size;
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Addr vsyscallOffset;
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Addr vsysexitOffset;
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};
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VSyscallPage vsyscallPage;
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public:
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void argsInit(int intSize, int pageSize);
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void startup();
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void syscall(int64_t callnum, ThreadContext *tc);
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X86ISA::IntReg getSyscallArg(ThreadContext *tc, int &i);
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X86ISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width);
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void setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val);
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};
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}
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#endif // __ARCH_X86_PROCESS_HH__
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