process.hh revision 180
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 <vector> 40 41#include "targetarch/isa_traits.hh" 42#include "sim/sim_object.hh" 43#include "sim/sim_stats.hh" 44#include "base/statistics.hh" 45 46class ExecContext; 47class FunctionalMemory; 48class Process : public SimObject 49{ 50 public: 51 52 // have we initialized an execution context from this process? If 53 // yes, subsequent contexts are assumed to be for dynamically 54 // created threads and are not initialized. 55 bool initialContextLoaded; 56 57 // execution contexts associated with this process 58 std::vector<ExecContext *> execContexts; 59 60 // number of CPUs (esxec contexts, really) assigned to this process. 61 unsigned int numCpus() { return execContexts.size(); } 62 63 // record of blocked context 64 struct WaitRec 65 { 66 Addr waitChan; 67 ExecContext *waitingContext; 68 69 WaitRec(Addr chan, ExecContext *ctx) 70 : waitChan(chan), waitingContext(ctx) 71 { 72 } 73 }; 74 75 // list of all blocked contexts 76 std::list<WaitRec> waitList; 77 78 RegFile *init_regs; // initial register contents 79 80 Addr text_base; // text (code) segment base 81 unsigned text_size; // text (code) size in bytes 82 83 Addr data_base; // initialized data segment base 84 unsigned data_size; // initialized data + bss size in bytes 85 86 Addr brk_point; // top of the data segment 87 88 Addr stack_base; // stack segment base (highest address) 89 unsigned stack_size; // initial stack size 90 Addr stack_min; // lowest address accessed on the stack 91 92 93 // addr to use for next stack region (for multithreaded apps) 94 Addr next_thread_stack_base; 95 96 std::string prog_fname; // file name 97 Addr prog_entry; // entry point (initial PC) 98 99 Statistics::Scalar<> num_syscalls; // number of syscalls executed 100 101 102 protected: 103 // constructor 104 Process(const std::string &name, 105 int stdin_fd, // initial I/O descriptors 106 int stdout_fd, 107 int stderr_fd); 108 109 110 protected: 111 FunctionalMemory *memory; 112 113 private: 114 // file descriptor remapping support 115 static const int MAX_FD = 100; // max legal fd value 116 int fd_map[MAX_FD+1]; 117 118 public: 119 // static helper functions to generate file descriptors for constructor 120 static int openInputFile(const std::string &filename); 121 static int openOutputFile(const std::string &filename); 122 123 // override of virtual SimObject method: register statistics 124 virtual void regStats(); 125 126 // register an execution context for this process. 127 // returns xc's cpu number (index into execContexts[]) 128 int registerExecContext(ExecContext *xc); 129 130 131 void replaceExecContext(int xcIndex, ExecContext *xc); 132 133 // map simulator fd sim_fd to target fd tgt_fd 134 void dup_fd(int sim_fd, int tgt_fd); 135 136 // generate new target fd for sim_fd 137 int open_fd(int sim_fd); 138 139 // look up simulator fd for given target fd 140 int sim_fd(int tgt_fd); 141 142 // is this a valid instruction fetch address? 143 bool validInstAddr(Addr addr) 144 { 145 return (text_base <= addr && 146 addr < text_base + text_size && 147 !(addr & (sizeof(MachInst)-1))); 148 } 149 150 // is this a valid address? (used to filter data fetches) 151 // note that we just assume stack size <= 16MB 152 // this may be alpha-specific 153 bool validDataAddr(Addr addr) 154 { 155 return ((data_base <= addr && addr < brk_point) || 156 ((stack_base - 16*1024*1024) <= addr && addr < stack_base) || 157 (text_base <= addr && addr < (text_base + text_size))); 158 } 159 160 virtual void syscall(ExecContext *xc) = 0; 161 162 virtual FunctionalMemory *getMemory() { return memory; } 163}; 164 165// 166// "Live" process with system calls redirected to host system 167// 168class MainMemory; 169class LiveProcess : public Process 170{ 171 public: 172 LiveProcess(const std::string &name, 173 int stdin_fd, int stdout_fd, int stderr_fd, 174 std::vector<std::string> &argv, 175 std::vector<std::string> &envp); 176 177 virtual void syscall(ExecContext *xc); 178}; 179 180#endif // !FULL_SYSTEM 181 182#endif // __PROG_HH__ 183