2014-10-23 00:53:34 +02:00
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/*
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* Copyright (c) 2003-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders 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.
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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: Steve Reinhardt
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*/
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#ifndef __SIM_SYSCALL_EMUL_BUF_HH__
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#define __SIM_SYSCALL_EMUL_BUF_HH__
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///
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/// @file syscall_emul_buf.hh
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///
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/// This file defines buffer classes used to handle pointer arguments
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/// in emulated syscalls.
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#include <cstring>
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#include "base/types.hh"
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#include "mem/se_translating_port_proxy.hh"
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/**
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* Base class for BufferArg and TypedBufferArg, Not intended to be
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* used directly.
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*
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* The BufferArg classes represent buffers in target user space that
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* are passed by reference to an (emulated) system call. Each
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* instance provides an internal (simulator-space) buffer of the
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* appropriate size and tracks the user-space address. The copyIn()
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* and copyOut() methods copy the user-space buffer to and from the
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* simulator-space buffer, respectively.
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*/
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class BaseBufferArg {
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public:
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/**
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* Allocate a buffer of size 'size' representing the memory at
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* target address 'addr'.
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*/
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BaseBufferArg(Addr _addr, int _size)
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: addr(_addr), size(_size), bufPtr(new uint8_t[size])
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{
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// clear out buffer: in case we only partially populate this,
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// and then do a copyOut(), we want to make sure we don't
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// introduce any random junk into the simulated address space
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memset(bufPtr, 0, size);
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}
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2014-10-23 00:53:34 +02:00
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~BaseBufferArg() { delete [] bufPtr; }
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2014-10-23 00:53:34 +02:00
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/**
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* copy data into simulator space (read from target memory)
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*/
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2014-10-23 00:53:34 +02:00
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bool copyIn(SETranslatingPortProxy &memproxy)
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2014-10-23 00:53:34 +02:00
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{
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memproxy.readBlob(addr, bufPtr, size);
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return true; // no EFAULT detection for now
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}
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/**
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* copy data out of simulator space (write to target memory)
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*/
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2014-10-23 00:53:34 +02:00
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bool copyOut(SETranslatingPortProxy &memproxy)
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2014-10-23 00:53:34 +02:00
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{
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memproxy.writeBlob(addr, bufPtr, size);
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return true; // no EFAULT detection for now
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}
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protected:
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const Addr addr; ///< address of buffer in target address space
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const int size; ///< buffer size
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uint8_t * const bufPtr; ///< pointer to buffer in simulator space
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};
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/**
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* BufferArg represents an untyped buffer in target user space that is
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* passed by reference to an (emulated) system call.
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*/
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class BufferArg : public BaseBufferArg
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{
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public:
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/**
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* Allocate a buffer of size 'size' representing the memory at
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* target address 'addr'.
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*/
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BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
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/**
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* Return a pointer to the internal simulator-space buffer.
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*/
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void *bufferPtr() { return bufPtr; }
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};
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/**
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* TypedBufferArg is a class template; instances of this template
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* represent typed buffers in target user space that are passed by
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* reference to an (emulated) system call.
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*
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* This template provides operator overloads for convenience, allowing
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* for example the use of '->' to reference fields within a struct
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* type.
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*/
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template <class T>
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class TypedBufferArg : public BaseBufferArg
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{
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public:
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/**
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* Allocate a buffer of type T representing the memory at target
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* address 'addr'. The user can optionally specify a specific
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* number of bytes to allocate to deal with structs that have
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* variable-size arrays at the end.
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*/
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TypedBufferArg(Addr _addr, int _size = sizeof(T))
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: BaseBufferArg(_addr, _size)
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{ }
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/**
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* Convert TypedBufferArg<T> to a pointer to T that points to the
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* internal buffer.
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*/
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operator T*() { return (T *)bufPtr; }
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/**
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* Convert TypedBufferArg<T> to a reference to T that references the
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* internal buffer value.
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*/
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T &operator*() { return *((T *)bufPtr); }
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/**
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* Enable the use of '->' to reference fields where T is a struct
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* type.
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*/
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T* operator->() { return (T *)bufPtr; }
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/**
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* Enable the use of '[]' to reference fields where T is an array
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* type.
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*/
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T &operator[](int i) { return ((T *)bufPtr)[i]; }
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};
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#endif // __SIM_SYSCALL_EMUL_BUF_HH__
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