process.hh revision 2
1/* 2 * Copyright (c) 2003 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 29#ifndef __PROG_HH__ 30#define __PROG_HH__ 31 32// 33// The purpose of this code is to fake the loader & syscall mechanism 34// when there's no OS: thus there's no reason to use it in FULL_SYSTEM 35// mode when we do have an OS. 36// 37#ifndef FULL_SYSTEM 38 39#include <list> 40 41#include "stats.hh" 42#include "sim_object.hh" 43 44#include "statistics.hh" 45#include "sim_stats.hh" 46 47class ExecContext; 48class FunctionalMemory; 49class Process : public SimObject 50{ 51 public: 52 53 // have we initialized an execution context from this process? If 54 // yes, subsequent contexts are assumed to be for dynamically 55 // created threads and are not initialized. 56 bool initialContextLoaded; 57 58 // execution contexts associated with this process 59 std::list<ExecContext *> execContexts; 60 // number of CPUs assigned to this process: should match number of 61 // contexts in execContexts list 62 unsigned numCpus; 63 64 // record of blocked context 65 struct WaitRec 66 { 67 Addr waitChan; 68 ExecContext *waitingContext; 69 70 WaitRec(Addr chan, ExecContext *ctx) 71 : waitChan(chan), waitingContext(ctx) 72 { 73 } 74 }; 75 76 // list of all blocked contexts 77 std::list<WaitRec> waitList; 78 79 RegFile *init_regs; // initial register contents 80 81 Addr text_base; // text (code) segment base 82 unsigned text_size; // text (code) size in bytes 83 84 Addr data_base; // initialized data segment base 85 unsigned data_size; // initialized data + bss size in bytes 86 87 Addr brk_point; // top of the data segment 88 89 Addr environ_base; // environment base address 90 Addr stack_base; // stack segment base (highest address) 91 unsigned stack_size; // initial stack size 92 Addr stack_min; // lowest address accessed on the stack 93 94 95 // addr to use for next stack region (for multithreaded apps) 96 Addr next_thread_stack_base; 97 98 std::string prog_fname; // file name 99 Addr prog_entry; // entry point (initial PC) 100 101 Statistics::Scalar<> num_syscalls; // number of syscalls executed 102 103 104 protected: 105 // constructor 106 Process(const std::string &name, 107 int stdin_fd, // initial I/O descriptors 108 int stdout_fd, 109 int stderr_fd); 110 111 112 protected: 113 FunctionalMemory *memory; 114 115 private: 116 // file descriptor remapping support 117 static const int MAX_FD = 100; // max legal fd value 118 int fd_map[MAX_FD+1]; 119 120 public: 121 // static helper functions to generate file descriptors for constructor 122 static int openInputFile(const std::string &filename); 123 static int openOutputFile(const std::string &filename); 124 125 // override of virtual SimObject method: register statistics 126 virtual void regStats(); 127 128 // register an execution context for this process 129 void registerExecContext(ExecContext *); 130 131 // map simulator fd sim_fd to target fd tgt_fd 132 void dup_fd(int sim_fd, int tgt_fd); 133 134 // generate new target fd for sim_fd 135 int open_fd(int sim_fd); 136 137 // look up simulator fd for given target fd 138 int sim_fd(int tgt_fd); 139 140 // is this a valid instruction fetch address? 141 bool validInstAddr(Addr addr) 142 { 143 return (text_base <= addr && 144 addr < text_base + text_size && 145 !(addr & (sizeof(MachInst)-1))); 146 } 147 148 // is this a valid address? (used to filter data fetches) 149 // note that we just assume stack size <= 16MB 150 // this may be alpha-specific 151 bool validDataAddr(Addr addr) 152 { 153 return ((data_base <= addr && addr < brk_point) || 154 ((stack_base - 16*1024*1024) <= addr && addr < stack_base) || 155 (text_base <= addr && addr < (text_base + text_size))); 156 } 157 158 virtual void syscall(ExecContext *xc) = 0; 159 160 virtual FunctionalMemory *getMemory() { return memory; } 161}; 162 163// 164// "Live" process with system calls redirected to host system 165// 166class MainMemory; 167class LiveProcess : public Process 168{ 169 public: 170 LiveProcess(const std::string &name, 171 int stdin_fd, int stdout_fd, int stderr_fd, 172 std::vector<std::string> &argv, 173 std::vector<std::string> &envp); 174 175 virtual void syscall(ExecContext *xc); 176}; 177 178#endif // !FULL_SYSTEM 179 180#endif // __PROG_HH__ 181