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29 #ifndef __PROCESS_HH__
30 #define __PROCESS_HH__
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.
41 #include "targetarch/isa_traits.hh"
42 #include "sim/sim_object.hh"
43 #include "sim/sim_stats.hh"
44 #include "base/statistics.hh"
47 class FunctionalMemory;
48 class Process : public SimObject
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;
57 // execution contexts associated with this process
58 std::vector<ExecContext *> execContexts;
60 // number of CPUs (esxec contexts, really) assigned to this process.
61 unsigned int numCpus() { return execContexts.size(); }
63 // record of blocked context
67 ExecContext *waitingContext;
69 WaitRec(Addr chan, ExecContext *ctx)
70 : waitChan(chan), waitingContext(ctx)
75 // list of all blocked contexts
76 std::list<WaitRec> waitList;
78 RegFile *init_regs; // initial register contents
80 Addr text_base; // text (code) segment base
81 unsigned text_size; // text (code) size in bytes
83 Addr data_base; // initialized data segment base
84 unsigned data_size; // initialized data + bss size in bytes
86 Addr brk_point; // top of the data segment
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
92 // addr to use for next stack region (for multithreaded apps)
93 Addr next_thread_stack_base;
95 // Base of region for mmaps (when user doesn't specify an address).
98 std::string prog_fname; // file name
99 Addr prog_entry; // entry point (initial PC)
101 Statistics::Scalar<> num_syscalls; // number of syscalls executed
106 Process(const std::string &name,
107 int stdin_fd, // initial I/O descriptors
113 FunctionalMemory *memory;
116 // file descriptor remapping support
117 static const int MAX_FD = 100; // max legal fd value
118 int fd_map[MAX_FD+1];
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);
125 // override of virtual SimObject method: register statistics
126 virtual void regStats();
128 // register an execution context for this process.
129 // returns xc's cpu number (index into execContexts[])
130 int registerExecContext(ExecContext *xc);
133 void replaceExecContext(int xcIndex, ExecContext *xc);
135 // map simulator fd sim_fd to target fd tgt_fd
136 void dup_fd(int sim_fd, int tgt_fd);
138 // generate new target fd for sim_fd
139 int open_fd(int sim_fd);
141 // look up simulator fd for given target fd
142 int sim_fd(int tgt_fd);
144 // is this a valid instruction fetch address?
145 bool validInstAddr(Addr addr)
147 return (text_base <= addr &&
148 addr < text_base + text_size &&
149 !(addr & (sizeof(MachInst)-1)));
152 // is this a valid address? (used to filter data fetches)
153 // note that we just assume stack size <= 16MB
154 // this may be alpha-specific
155 bool validDataAddr(Addr addr)
157 return ((data_base <= addr && addr < brk_point) ||
158 ((stack_base - 16*1024*1024) <= addr && addr < stack_base) ||
159 (text_base <= addr && addr < (text_base + text_size)));
162 virtual void syscall(ExecContext *xc) = 0;
164 virtual FunctionalMemory *getMemory() { return memory; }
168 // "Live" process with system calls redirected to host system
171 class LiveProcess : public Process
174 LiveProcess(const std::string &name, ObjectFile *objFile,
175 int stdin_fd, int stdout_fd, int stderr_fd,
176 std::vector<std::string> &argv,
177 std::vector<std::string> &envp);
180 // this function is used to create the LiveProcess object, since
181 // we can't tell which subclass of LiveProcess to use until we
182 // open and look at the object file.
183 static LiveProcess *create(const std::string &name,
184 int stdin_fd, int stdout_fd, int stderr_fd,
185 std::vector<std::string> &argv,
186 std::vector<std::string> &envp);
190 #endif // !FULL_SYSTEM
192 #endif // __PROCESS_HH__