a1ad9e652a
Do some minor cleanup of some recently added comments, a warning, and change other instances of stack extension to be like what's now being done for x86.
322 lines
8.9 KiB
C++
322 lines
8.9 KiB
C++
/*
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* Copyright (c) 2001-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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* Steve Reinhardt
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*/
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#ifndef __PROCESS_HH__
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#define __PROCESS_HH__
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//
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// The purpose of this code is to fake the loader & syscall mechanism
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// when there's no OS: thus there's no reason to use it in FULL_SYSTEM
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// mode when we do have an OS.
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//
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#include "config/full_system.hh"
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#if !FULL_SYSTEM
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#include <string>
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#include <vector>
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#include "arch/registers.hh"
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#include "base/statistics.hh"
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#include "base/types.hh"
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#include "config/the_isa.hh"
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#include "sim/sim_object.hh"
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#include "sim/syscallreturn.hh"
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class PageTable;
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class ProcessParams;
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class LiveProcessParams;
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class SyscallDesc;
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class System;
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class ThreadContext;
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class TranslatingPort;
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template<class IntType>
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struct AuxVector
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{
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IntType a_type;
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IntType a_val;
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AuxVector()
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{}
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AuxVector(IntType type, IntType val);
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};
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class Process : public SimObject
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{
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public:
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/// Pointer to object representing the system this process is
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/// running on.
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System *system;
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// thread contexts associated with this process
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std::vector<int> contextIds;
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// number of CPUs (esxec contexts, really) assigned to this process.
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unsigned int numCpus() { return contextIds.size(); }
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// record of blocked context
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struct WaitRec
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{
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Addr waitChan;
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ThreadContext *waitingContext;
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WaitRec(Addr chan, ThreadContext *ctx)
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: waitChan(chan), waitingContext(ctx)
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{ }
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};
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// list of all blocked contexts
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std::list<WaitRec> waitList;
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Addr brk_point; // top of the data segment
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Addr stack_base; // stack segment base (highest address)
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unsigned stack_size; // initial stack size
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Addr stack_min; // lowest address accessed on the stack
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// The maximum size allowed for the stack.
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Addr max_stack_size;
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// addr to use for next stack region (for multithreaded apps)
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Addr next_thread_stack_base;
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// Base of region for mmaps (when user doesn't specify an address).
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Addr mmap_start;
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Addr mmap_end;
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// Base of region for nxm data
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Addr nxm_start;
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Addr nxm_end;
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std::string prog_fname; // file name
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Stats::Scalar num_syscalls; // number of syscalls executed
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protected:
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// constructor
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Process(ProcessParams *params);
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virtual void initState();
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protected:
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/// Memory object for initialization (image loading)
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TranslatingPort *initVirtMem;
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public:
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PageTable *pTable;
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//This id is assigned by m5 and is used to keep process' tlb entries
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//separated.
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uint64_t M5_pid;
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class FdMap
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{
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public:
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int fd;
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std::string filename;
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int mode;
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int flags;
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bool isPipe;
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int readPipeSource;
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uint64_t fileOffset;
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FdMap()
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: fd(-1), filename("NULL"), mode(0), flags(0),
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isPipe(false), readPipeSource(0), fileOffset(0)
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{ }
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void serialize(std::ostream &os);
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void unserialize(Checkpoint *cp, const std::string §ion);
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};
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private:
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// file descriptor remapping support
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static const int MAX_FD = 256; // max legal fd value
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FdMap fd_map[MAX_FD+1];
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public:
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// static helper functions to generate file descriptors for constructor
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static int openInputFile(const std::string &filename);
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static int openOutputFile(const std::string &filename);
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// override of virtual SimObject method: register statistics
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virtual void regStats();
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// After getting registered with system object, tell process which
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// system-wide context id it is assigned.
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void assignThreadContext(int context_id)
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{
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contextIds.push_back(context_id);
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}
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// Find a free context to use
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ThreadContext *findFreeContext();
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// map simulator fd sim_fd to target fd tgt_fd
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void dup_fd(int sim_fd, int tgt_fd);
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// generate new target fd for sim_fd
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int alloc_fd(int sim_fd, std::string filename, int flags, int mode,
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bool pipe);
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// free target fd (e.g., after close)
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void free_fd(int tgt_fd);
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// look up simulator fd for given target fd
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int sim_fd(int tgt_fd);
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// look up simulator fd_map object for a given target fd
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FdMap *sim_fd_obj(int tgt_fd);
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// fix all offsets for currently open files and save them
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void fix_file_offsets();
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// find all offsets for currently open files and save them
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void find_file_offsets();
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// set the source of this read pipe for a checkpoint resume
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void setReadPipeSource(int read_pipe_fd, int source_fd);
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virtual void syscall(int64_t callnum, ThreadContext *tc) = 0;
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/// Attempt to fix up a fault at vaddr by allocating a page on the stack.
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/// @return Whether the fault has been fixed.
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bool fixupStackFault(Addr vaddr);
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void serialize(std::ostream &os);
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void unserialize(Checkpoint *cp, const std::string §ion);
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};
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//
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// "Live" process with system calls redirected to host system
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//
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class ObjectFile;
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class LiveProcess : public Process
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{
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protected:
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ObjectFile *objFile;
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std::vector<std::string> argv;
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std::vector<std::string> envp;
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std::string cwd;
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LiveProcess(LiveProcessParams *params, ObjectFile *objFile);
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// Id of the owner of the process
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uint64_t __uid;
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uint64_t __euid;
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uint64_t __gid;
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uint64_t __egid;
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// pid of the process and it's parent
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uint64_t __pid;
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uint64_t __ppid;
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public:
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enum AuxiliaryVectorType {
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M5_AT_NULL = 0,
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M5_AT_IGNORE = 1,
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M5_AT_EXECFD = 2,
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M5_AT_PHDR = 3,
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M5_AT_PHENT = 4,
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M5_AT_PHNUM = 5,
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M5_AT_PAGESZ = 6,
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M5_AT_BASE = 7,
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M5_AT_FLAGS = 8,
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M5_AT_ENTRY = 9,
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M5_AT_NOTELF = 10,
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M5_AT_UID = 11,
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M5_AT_EUID = 12,
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M5_AT_GID = 13,
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M5_AT_EGID = 14,
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// The following may be specific to Linux
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M5_AT_PLATFORM = 15,
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M5_AT_HWCAP = 16,
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M5_AT_CLKTCK = 17,
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M5_AT_SECURE = 23,
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M5_BASE_PLATFORM = 24,
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M5_AT_RANDOM = 25,
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M5_AT_EXECFN = 31,
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M5_AT_VECTOR_SIZE = 44
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};
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inline uint64_t uid() {return __uid;}
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inline uint64_t euid() {return __euid;}
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inline uint64_t gid() {return __gid;}
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inline uint64_t egid() {return __egid;}
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inline uint64_t pid() {return __pid;}
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inline uint64_t ppid() {return __ppid;}
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std::string
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fullPath(const std::string &filename)
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{
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if (filename[0] == '/' || cwd.empty())
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return filename;
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std::string full = cwd;
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if (cwd[cwd.size() - 1] != '/')
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full += '/';
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return full + filename;
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}
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std::string getcwd() const { return cwd; }
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virtual void syscall(int64_t callnum, ThreadContext *tc);
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virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i) = 0;
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virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width);
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virtual void setSyscallArg(ThreadContext *tc,
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int i, TheISA::IntReg val) = 0;
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virtual void setSyscallReturn(ThreadContext *tc,
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SyscallReturn return_value) = 0;
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virtual SyscallDesc *getDesc(int callnum) = 0;
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// this function is used to create the LiveProcess object, since
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// we can't tell which subclass of LiveProcess to use until we
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// open and look at the object file.
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static LiveProcess *create(LiveProcessParams *params);
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};
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#endif // !FULL_SYSTEM
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#endif // __PROCESS_HH__
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