process.hh revision 2093
1/* 2 * Copyright (c) 2001-2005 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 __PROCESS_HH__ 30#define __PROCESS_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#include "config/full_system.hh" 38 39#if !FULL_SYSTEM 40 41#include <vector> 42 43#include "arch/isa_traits.hh" 44#include "sim/sim_object.hh" 45#include "sim/stats.hh" 46#include "base/statistics.hh" 47#include "base/trace.hh" 48 49class ExecContext; 50class FunctionalMemory; 51class SyscallDesc; 52class Process : public SimObject 53{ 54 public: 55 56 // have we initialized an execution context from this process? If 57 // yes, subsequent contexts are assumed to be for dynamically 58 // created threads and are not initialized. 59 bool initialContextLoaded; 60 61 // execution contexts associated with this process 62 std::vector<ExecContext *> execContexts; 63 64 // number of CPUs (esxec contexts, really) assigned to this process. 65 unsigned int numCpus() { return execContexts.size(); } 66 67 // record of blocked context 68 struct WaitRec 69 { 70 Addr waitChan; 71 ExecContext *waitingContext; 72 73 WaitRec(Addr chan, ExecContext *ctx) 74 : waitChan(chan), waitingContext(ctx) 75 { 76 } 77 }; 78 79 // list of all blocked contexts 80 std::list<WaitRec> waitList; 81 82 RegFile *init_regs; // initial register contents 83 84 Addr text_base; // text (code) segment base 85 unsigned text_size; // text (code) size in bytes 86 87 Addr data_base; // initialized data segment base 88 unsigned data_size; // initialized data + bss size in bytes 89 90 Addr brk_point; // top of the data segment 91 92 Addr stack_base; // stack segment base (highest address) 93 unsigned stack_size; // initial stack size 94 Addr stack_min; // lowest address accessed on the stack 95 96 // addr to use for next stack region (for multithreaded apps) 97 Addr next_thread_stack_base; 98 99 // Base of region for mmaps (when user doesn't specify an address). 100 Addr mmap_start; 101 Addr mmap_end; 102 103 // Base of region for nxm data 104 Addr nxm_start; 105 Addr nxm_end; 106 107 std::string prog_fname; // file name 108 Addr prog_entry; // entry point (initial PC) 109 110 Stats::Scalar<> num_syscalls; // number of syscalls executed 111 112 113 protected: 114 // constructor 115 Process(const std::string &nm, 116 int stdin_fd, // initial I/O descriptors 117 int stdout_fd, 118 int stderr_fd); 119 120 // post initialization startup 121 virtual void startup(); 122 123 protected: 124 FunctionalMemory *memory; 125 126 private: 127 // file descriptor remapping support 128 static const int MAX_FD = 256; // max legal fd value 129 int fd_map[MAX_FD+1]; 130 131 public: 132 // static helper functions to generate file descriptors for constructor 133 static int openInputFile(const std::string &filename); 134 static int openOutputFile(const std::string &filename); 135 136 // override of virtual SimObject method: register statistics 137 virtual void regStats(); 138 139 // register an execution context for this process. 140 // returns xc's cpu number (index into execContexts[]) 141 int registerExecContext(ExecContext *xc); 142 143 144 void replaceExecContext(ExecContext *xc, int xcIndex); 145 146 // map simulator fd sim_fd to target fd tgt_fd 147 void dup_fd(int sim_fd, int tgt_fd); 148 149 // generate new target fd for sim_fd 150 int alloc_fd(int sim_fd); 151 152 // free target fd (e.g., after close) 153 void free_fd(int tgt_fd); 154 155 // look up simulator fd for given target fd 156 int sim_fd(int tgt_fd); 157 158 // is this a valid instruction fetch address? 159 bool validInstAddr(Addr addr) 160 { 161 return (text_base <= addr && 162 addr < text_base + text_size && 163 !(addr & (sizeof(MachInst)-1))); 164 } 165 166 // is this a valid address? (used to filter data fetches) 167 // note that we just assume stack size <= 16MB 168 // this may be alpha-specific 169 bool validDataAddr(Addr addr) 170 { 171 return ((data_base <= addr && addr < brk_point) || 172 (next_thread_stack_base <= addr && addr < stack_base) || 173 (text_base <= addr && addr < (text_base + text_size)) || 174 (mmap_start <= addr && addr < mmap_end) || 175 (nxm_start <= addr && addr < nxm_end)); 176 } 177 178 virtual void syscall(ExecContext *xc) = 0; 179 180 virtual FunctionalMemory *getMemory() { return memory; } 181}; 182 183// 184// "Live" process with system calls redirected to host system 185// 186class ObjectFile; 187class LiveProcess : public Process 188{ 189 protected: 190 LiveProcess(const std::string &nm, ObjectFile *objFile, 191 int stdin_fd, int stdout_fd, int stderr_fd, 192 std::vector<std::string> &argv, 193 std::vector<std::string> &envp); 194 195 public: 196 // this function is used to create the LiveProcess object, since 197 // we can't tell which subclass of LiveProcess to use until we 198 // open and look at the object file. 199 static LiveProcess *create(const std::string &nm, 200 int stdin_fd, int stdout_fd, int stderr_fd, 201 std::string executable, 202 std::vector<std::string> &argv, 203 std::vector<std::string> &envp); 204 205 virtual void syscall(ExecContext *xc); 206 207 virtual SyscallDesc* getDesc(int callnum) { panic("Must be implemented."); } 208 209}; 210 211 212#endif // !FULL_SYSTEM 213 214#endif // __PROCESS_HH__ 215