process.hh revision 2190
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 CPUExecContext; 50class ExecContext; 51class FunctionalMemory; 52class SyscallDesc; 53class Process : public SimObject 54{ 55 protected: 56 typedef TheISA::RegFile RegFile; 57 typedef TheISA::MachInst MachInst; 58 public: 59 60 // have we initialized an execution context from this process? If 61 // yes, subsequent contexts are assumed to be for dynamically 62 // created threads and are not initialized. 63 bool initialContextLoaded; 64 65 // execution contexts associated with this process 66 std::vector<ExecContext *> execContexts; 67 68 // number of CPUs (esxec contexts, really) assigned to this process. 69 unsigned int numCpus() { return execContexts.size(); } 70 71 // record of blocked context 72 struct WaitRec 73 { 74 Addr waitChan; 75 ExecContext *waitingContext; 76 77 WaitRec(Addr chan, ExecContext *ctx) 78 : waitChan(chan), waitingContext(ctx) 79 { 80 } 81 }; 82 83 // list of all blocked contexts 84 std::list<WaitRec> waitList; 85 86 RegFile *init_regs; // initial register contents 87 CPUExecContext *cpuXC; // XC to hold the init_regs 88 89 Addr text_base; // text (code) segment base 90 unsigned text_size; // text (code) size in bytes 91 92 Addr data_base; // initialized data segment base 93 unsigned data_size; // initialized data + bss size in bytes 94 95 Addr brk_point; // top of the data segment 96 97 Addr stack_base; // stack segment base (highest address) 98 unsigned stack_size; // initial stack size 99 Addr stack_min; // lowest address accessed on the stack 100 101 // addr to use for next stack region (for multithreaded apps) 102 Addr next_thread_stack_base; 103 104 // Base of region for mmaps (when user doesn't specify an address). 105 Addr mmap_start; 106 Addr mmap_end; 107 108 // Base of region for nxm data 109 Addr nxm_start; 110 Addr nxm_end; 111 112 std::string prog_fname; // file name 113 Addr prog_entry; // entry point (initial PC) 114 115 Stats::Scalar<> num_syscalls; // number of syscalls executed 116 117 118 protected: 119 // constructor 120 Process(const std::string &nm, 121 int stdin_fd, // initial I/O descriptors 122 int stdout_fd, 123 int stderr_fd); 124 125 // post initialization startup 126 virtual void startup(); 127 128 protected: 129 FunctionalMemory *memory; 130 131 private: 132 // file descriptor remapping support 133 static const int MAX_FD = 256; // max legal fd value 134 int fd_map[MAX_FD+1]; 135 136 public: 137 // static helper functions to generate file descriptors for constructor 138 static int openInputFile(const std::string &filename); 139 static int openOutputFile(const std::string &filename); 140 141 // override of virtual SimObject method: register statistics 142 virtual void regStats(); 143 144 // register an execution context for this process. 145 // returns xc's cpu number (index into execContexts[]) 146 int registerExecContext(ExecContext *xc); 147 148 149 void replaceExecContext(ExecContext *xc, int xcIndex); 150 151 // map simulator fd sim_fd to target fd tgt_fd 152 void dup_fd(int sim_fd, int tgt_fd); 153 154 // generate new target fd for sim_fd 155 int alloc_fd(int sim_fd); 156 157 // free target fd (e.g., after close) 158 void free_fd(int tgt_fd); 159 160 // look up simulator fd for given target fd 161 int sim_fd(int tgt_fd); 162 163 // is this a valid instruction fetch address? 164 bool validInstAddr(Addr addr) 165 { 166 return (text_base <= addr && 167 addr < text_base + text_size && 168 !(addr & (sizeof(MachInst)-1))); 169 } 170 171 // is this a valid address? (used to filter data fetches) 172 // note that we just assume stack size <= 16MB 173 // this may be alpha-specific 174 bool validDataAddr(Addr addr) 175 { 176 return ((data_base <= addr && addr < brk_point) || 177 (next_thread_stack_base <= addr && addr < stack_base) || 178 (text_base <= addr && addr < (text_base + text_size)) || 179 (mmap_start <= addr && addr < mmap_end) || 180 (nxm_start <= addr && addr < nxm_end)); 181 } 182 183 virtual void syscall(ExecContext *xc) = 0; 184 185 virtual FunctionalMemory *getMemory() { return memory; } 186}; 187 188// 189// "Live" process with system calls redirected to host system 190// 191class ObjectFile; 192class LiveProcess : public Process 193{ 194 protected: 195 LiveProcess(const std::string &nm, ObjectFile *objFile, 196 int stdin_fd, int stdout_fd, int stderr_fd, 197 std::vector<std::string> &argv, 198 std::vector<std::string> &envp); 199 200 public: 201 // this function is used to create the LiveProcess object, since 202 // we can't tell which subclass of LiveProcess to use until we 203 // open and look at the object file. 204 static LiveProcess *create(const std::string &nm, 205 int stdin_fd, int stdout_fd, int stderr_fd, 206 std::string executable, 207 std::vector<std::string> &argv, 208 std::vector<std::string> &envp); 209 210 virtual void syscall(ExecContext *xc); 211 212 virtual SyscallDesc* getDesc(int callnum) { panic("Must be implemented."); } 213 214}; 215 216 217#endif // !FULL_SYSTEM 218 219#endif // __PROCESS_HH__ 220