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Diffstat (limited to 'sim/prog.hh')
| -rw-r--r-- | sim/prog.hh | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/sim/prog.hh b/sim/prog.hh new file mode 100644 index 000000000..a38afee14 --- /dev/null +++ b/sim/prog.hh @@ -0,0 +1,180 @@ +/* + * Copyright (c) 2003 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __PROG_HH__ +#define __PROG_HH__ + +// +// The purpose of this code is to fake the loader & syscall mechanism +// when there's no OS: thus there's no reason to use it in FULL_SYSTEM +// mode when we do have an OS. +// +#ifndef FULL_SYSTEM + +#include <list> + +#include "stats.hh" +#include "sim_object.hh" + +#include "statistics.hh" +#include "sim_stats.hh" + +class ExecContext; +class FunctionalMemory; +class Process : public SimObject +{ + public: + + // have we initialized an execution context from this process? If + // yes, subsequent contexts are assumed to be for dynamically + // created threads and are not initialized. + bool initialContextLoaded; + + // execution contexts associated with this process + std::list<ExecContext *> execContexts; + // number of CPUs assigned to this process: should match number of + // contexts in execContexts list + unsigned numCpus; + + // record of blocked context + struct WaitRec + { + Addr waitChan; + ExecContext *waitingContext; + + WaitRec(Addr chan, ExecContext *ctx) + : waitChan(chan), waitingContext(ctx) + { + } + }; + + // list of all blocked contexts + std::list<WaitRec> waitList; + + RegFile *init_regs; // initial register contents + + Addr text_base; // text (code) segment base + unsigned text_size; // text (code) size in bytes + + Addr data_base; // initialized data segment base + unsigned data_size; // initialized data + bss size in bytes + + Addr brk_point; // top of the data segment + + Addr environ_base; // environment base address + Addr stack_base; // stack segment base (highest address) + unsigned stack_size; // initial stack size + Addr stack_min; // lowest address accessed on the stack + + + // addr to use for next stack region (for multithreaded apps) + Addr next_thread_stack_base; + + std::string prog_fname; // file name + Addr prog_entry; // entry point (initial PC) + + Statistics::Scalar<> num_syscalls; // number of syscalls executed + + + protected: + // constructor + Process(const std::string &name, + int stdin_fd, // initial I/O descriptors + int stdout_fd, + int stderr_fd); + + + protected: + FunctionalMemory *memory; + + private: + // file descriptor remapping support + static const int MAX_FD = 100; // max legal fd value + int fd_map[MAX_FD+1]; + + public: + // static helper functions to generate file descriptors for constructor + static int openInputFile(const std::string &filename); + static int openOutputFile(const std::string &filename); + + // override of virtual SimObject method: register statistics + virtual void regStats(); + + // register an execution context for this process + void registerExecContext(ExecContext *); + + // map simulator fd sim_fd to target fd tgt_fd + void dup_fd(int sim_fd, int tgt_fd); + + // generate new target fd for sim_fd + int open_fd(int sim_fd); + + // look up simulator fd for given target fd + int sim_fd(int tgt_fd); + + // is this a valid instruction fetch address? + bool validInstAddr(Addr addr) + { + return (text_base <= addr && + addr < text_base + text_size && + !(addr & (sizeof(MachInst)-1))); + } + + // is this a valid address? (used to filter data fetches) + // note that we just assume stack size <= 16MB + // this may be alpha-specific + bool validDataAddr(Addr addr) + { + return ((data_base <= addr && addr < brk_point) || + ((stack_base - 16*1024*1024) <= addr && addr < stack_base) || + (text_base <= addr && addr < (text_base + text_size))); + } + + virtual void syscall(ExecContext *xc) = 0; + + virtual FunctionalMemory *getMemory() { return memory; } +}; + +// +// "Live" process with system calls redirected to host system +// +class MainMemory; +class LiveProcess : public Process +{ + public: + LiveProcess(const std::string &name, + int stdin_fd, int stdout_fd, int stderr_fd, + std::vector<std::string> &argv, + std::vector<std::string> &envp); + + virtual void syscall(ExecContext *xc); +}; + +#endif // !FULL_SYSTEM + +#endif // __PROG_HH__ |