X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fsim%2Fprocess.hh;h=cb2a3e2beb3d17ea8cffd5f5137a730b86bb6287;hb=aa56ed4dc50255869e72b9399c671c21d88e88d4;hp=99666384786f94694335a4eefaa807f94de4f5f1;hpb=854aa60fdcec2a95d2c08844d62681b498281ca3;p=gem5.git diff --git a/src/sim/process.hh b/src/sim/process.hh index 996663847..cb2a3e2be 100644 --- a/src/sim/process.hh +++ b/src/sim/process.hh @@ -1,4 +1,5 @@ /* + * Copyright (c) 2014-2016 Advanced Micro Devices, Inc. * Copyright (c) 2001-2005 The Regents of The University of Michigan * All rights reserved. * @@ -27,314 +28,192 @@ * * Authors: Nathan Binkert * Steve Reinhardt + * Brandon Potter */ #ifndef __PROCESS_HH__ #define __PROCESS_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. -// -#include "config/full_system.hh" - -#if !FULL_SYSTEM +#include +#include #include #include +#include "arch/registers.hh" #include "base/statistics.hh" -#include "sim/host.hh" +#include "base/types.hh" +#include "config/the_isa.hh" +#include "mem/se_translating_port_proxy.hh" +#include "sim/fd_array.hh" +#include "sim/fd_entry.hh" +#include "sim/mem_state.hh" #include "sim/sim_object.hh" -class GDBListener; -class PageTable; -class ProcessParams; -class LiveProcessParams; +struct ProcessParams; + +class EmulatedDriver; +class ObjectFile; +class EmulationPageTable; class SyscallDesc; +class SyscallReturn; class System; class ThreadContext; -class TranslatingPort; -namespace TheISA -{ - class RemoteGDB; -} - -template -struct M5_auxv_t -{ - IntType a_type; - union { - IntType a_val; - IntType a_ptr; - IntType a_fcn; - }; - - M5_auxv_t() - {} - - M5_auxv_t(IntType type, IntType val); -}; class Process : public SimObject { public: + Process(ProcessParams *params, EmulationPageTable *pTable, + ObjectFile *obj_file); + + void serialize(CheckpointOut &cp) const override; + void unserialize(CheckpointIn &cp) override; + + void initState() override; + DrainState drain() override; + + virtual void syscall(int64_t callnum, ThreadContext *tc, Fault *fault); + virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i) = 0; + virtual TheISA::IntReg getSyscallArg(ThreadContext *tc, int &i, int width); + virtual void setSyscallArg(ThreadContext *tc, int i, + TheISA::IntReg val) = 0; + virtual void setSyscallReturn(ThreadContext *tc, + SyscallReturn return_value) = 0; + virtual SyscallDesc *getDesc(int callnum) = 0; + + inline uint64_t uid() { return _uid; } + inline uint64_t euid() { return _euid; } + inline uint64_t gid() { return _gid; } + inline uint64_t egid() { return _egid; } + inline uint64_t pid() { return _pid; } + inline uint64_t ppid() { return _ppid; } + inline uint64_t pgid() { return _pgid; } + inline uint64_t tgid() { return _tgid; } + inline void setpgid(uint64_t pgid) { _pgid = pgid; } + + const char *progName() const { return executable.c_str(); } + std::string fullPath(const std::string &filename); + std::string getcwd() const { return cwd; } - /// Pointer to object representing the system this process is - /// running on. - System *system; - - // have we initialized a thread context from this process? If - // yes, subsequent contexts are assumed to be for dynamically - // created threads and are not initialized. - bool initialContextLoaded; - - bool checkpointRestored; - - // thread contexts associated with this process - std::vector contextIds; - - // remote gdb objects - std::vector remoteGDB; - std::vector gdbListen; - bool breakpoint(); - - // number of CPUs (esxec contexts, really) assigned to this process. - unsigned int numCpus() { return contextIds.size(); } - - // record of blocked context - struct WaitRec - { - Addr waitChan; - ThreadContext *waitingContext; - - WaitRec(Addr chan, ThreadContext *ctx) - : waitChan(chan), waitingContext(ctx) - { } - }; - - // list of all blocked contexts - std::list waitList; - - Addr brk_point; // top of the data segment - - Addr stack_base; // stack segment base (highest address) - unsigned stack_size; // initial stack size - Addr stack_min; // lowest address accessed on the stack - - // The maximum size allowed for the stack. - Addr max_stack_size; - - // addr to use for next stack region (for multithreaded apps) - Addr next_thread_stack_base; - - // Base of region for mmaps (when user doesn't specify an address). - Addr mmap_start; - Addr mmap_end; - - // Base of region for nxm data - Addr nxm_start; - Addr nxm_end; - - std::string prog_fname; // file name - - Stats::Scalar<> num_syscalls; // number of syscalls executed - - - protected: - // constructor - Process(ProcessParams * params); - - // post initialization startup - virtual void startup(); - - protected: - /// Memory object for initialization (image loading) - TranslatingPort *initVirtMem; - - public: - PageTable *pTable; - - //This id is assigned by m5 and is used to keep process' tlb entries - //separated. - uint64_t M5_pid; - - class FdMap - { - public: - int fd; - std::string filename; - int mode; - int flags; - bool isPipe; - int readPipeSource; - uint64_t fileOffset; - - - FdMap() - { - fd = -1; - filename = "NULL"; - mode = 0; - flags = 0; - isPipe = false; - readPipeSource = 0; - fileOffset = 0; - - } - - void serialize(std::ostream &os); - void unserialize(Checkpoint *cp, const std::string §ion); - - }; - - private: - // file descriptor remapping support - static const int MAX_FD = 256; // max legal fd value - FdMap fd_map[MAX_FD+1]; + /** + * Find an emulated device driver. + * + * @param filename Name of the device (under /dev) + * @return Pointer to driver object if found, else nullptr + */ + EmulatedDriver *findDriver(std::string filename); + + // This function acts as a callback to update the bias value in + // the object file because the parameters needed to calculate the + // bias are not available when the object file is created. + void updateBias(); + Addr getBias(); + Addr getStartPC(); + ObjectFile *getInterpreter(); + // override of virtual SimObject method: register statistics + void regStats() override; - public: - // static helper functions to generate file descriptors for constructor - static int openInputFile(const std::string &filename); - static int openOutputFile(const std::string &filename); + void allocateMem(Addr vaddr, int64_t size, bool clobber = false); - // override of virtual SimObject method: register statistics - virtual void regStats(); + /// Attempt to fix up a fault at vaddr by allocating a page on the stack. + /// @return Whether the fault has been fixed. + bool fixupStackFault(Addr vaddr); // After getting registered with system object, tell process which // system-wide context id it is assigned. - void assignThreadContext(int context_id) + void + assignThreadContext(ContextID context_id) { contextIds.push_back(context_id); } // Find a free context to use - ThreadContext * findFreeContext(); - - // 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 alloc_fd(int sim_fd, std::string filename, int flags, int mode, bool pipe); - - // free target fd (e.g., after close) - void free_fd(int tgt_fd); - - // look up simulator fd for given target fd - int sim_fd(int tgt_fd); - - // look up simulator fd_map object for a given target fd - FdMap * sim_fd_obj(int tgt_fd); + ThreadContext *findFreeContext(); + + /** + * After delegating a thread context to a child process + * no longer should relate to the ThreadContext + */ + void revokeThreadContext(int context_id); + + /** + * Does mmap region grow upward or downward from mmapEnd? Most + * platforms grow downward, but a few (such as Alpha) grow upward + * instead, so they can override this method to return false. + */ + virtual bool mmapGrowsDown() const { return true; } + + /** + * Maps a contiguous range of virtual addresses in this process's + * address space to a contiguous range of physical addresses. + * This function exists primarily to expose the map operation to + * python, so that configuration scripts can set up mappings in SE mode. + * + * @param vaddr The starting virtual address of the range. + * @param paddr The starting physical address of the range. + * @param size The length of the range in bytes. + * @param cacheable Specifies whether accesses are cacheable. + * @return True if the map operation was successful. (At this + * point in time, the map operation always succeeds.) + */ + bool map(Addr vaddr, Addr paddr, int size, bool cacheable = true); + + void replicatePage(Addr vaddr, Addr new_paddr, ThreadContext *old_tc, + ThreadContext *new_tc, bool alloc_page); + + virtual void clone(ThreadContext *old_tc, ThreadContext *new_tc, + Process *new_p, TheISA::IntReg flags); - // fix all offsets for currently open files and save them - void fix_file_offsets(); + // thread contexts associated with this process + std::vector contextIds; - // find all offsets for currently open files and save them - void find_file_offsets(); + // system object which owns this process + System *system; - // set the source of this read pipe for a checkpoint resume - void setReadPipeSource(int read_pipe_fd, int source_fd); + Stats::Scalar numSyscalls; // track how many system calls are executed - virtual void syscall(int64_t callnum, ThreadContext *tc) = 0; + bool useArchPT; // flag for using architecture specific page table + bool kvmInSE; // running KVM requires special initialization - // check if the this addr is on the next available page and allocate it - // if it's not we'll panic - bool checkAndAllocNextPage(Addr vaddr); + EmulationPageTable *pTable; - void serialize(std::ostream &os); - void unserialize(Checkpoint *cp, const std::string §ion); -}; + SETranslatingPortProxy initVirtMem; // memory proxy for initial image load -// -// "Live" process with system calls redirected to host system -// -class ObjectFile; -class LiveProcess : public Process -{ - protected: ObjectFile *objFile; std::vector argv; std::vector envp; std::string cwd; - - LiveProcess(LiveProcessParams * params, ObjectFile *objFile); - - virtual void argsInit(int intSize, int pageSize); + std::string executable; // Id of the owner of the process - uint64_t __uid; - uint64_t __euid; - uint64_t __gid; - uint64_t __egid; + uint64_t _uid; + uint64_t _euid; + uint64_t _gid; + uint64_t _egid; // pid of the process and it's parent - uint64_t __pid; - uint64_t __ppid; + uint64_t _pid; + uint64_t _ppid; + uint64_t _pgid; + uint64_t _tgid; - public: + // Emulated drivers available to this process + std::vector drivers; - enum AuxiliaryVectorType { - M5_AT_NULL = 0, - M5_AT_IGNORE = 1, - M5_AT_EXECFD = 2, - M5_AT_PHDR = 3, - M5_AT_PHENT = 4, - M5_AT_PHNUM = 5, - M5_AT_PAGESZ = 6, - M5_AT_BASE = 7, - M5_AT_FLAGS = 8, - M5_AT_ENTRY = 9, - M5_AT_NOTELF = 10, - M5_AT_UID = 11, - M5_AT_EUID = 12, - M5_AT_GID = 13, - M5_AT_EGID = 14, - // The following may be specific to Linux - M5_AT_PLATFORM = 15, - M5_AT_HWCAP = 16, - M5_AT_CLKTCK = 17, - - M5_AT_SECURE = 23, - - M5_AT_VECTOR_SIZE = 44 - }; - - inline uint64_t uid() {return __uid;} - inline uint64_t euid() {return __euid;} - inline uint64_t gid() {return __gid;} - inline uint64_t egid() {return __egid;} - inline uint64_t pid() {return __pid;} - inline uint64_t ppid() {return __ppid;} - - std::string - fullPath(const std::string &filename) - { - if (filename[0] == '/' || cwd.empty()) - return filename; + std::shared_ptr fds; - std::string full = cwd; + bool *exitGroup; + std::shared_ptr memState; - if (cwd[cwd.size() - 1] != '/') - full += '/'; + /** + * Calls a futex wakeup at the address specified by this pointer when + * this process exits. + */ + uint64_t childClearTID; - return full + filename; - } - - std::string getcwd() const { return cwd; } - - virtual void syscall(int64_t callnum, ThreadContext *tc); - - virtual SyscallDesc* getDesc(int callnum) = 0; - - // this function is used to create the LiveProcess object, since - // we can't tell which subclass of LiveProcess to use until we - // open and look at the object file. - static LiveProcess *create(LiveProcessParams * params); + // Process was forked with SIGCHLD set. + bool *sigchld; }; - -#endif // !FULL_SYSTEM - #endif // __PROCESS_HH__