/*
 * Copyright (c) 2003-2004 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.
 *
 * Authors: Gabe Black
 *          Ali Saidi
 */

#include "arch/sparc/isa_traits.hh"
#include "arch/sparc/process.hh"
#include "base/loader/object_file.hh"
#include "base/loader/elf_object.hh"
#include "base/misc.hh"
#include "cpu/thread_context.hh"
#include "mem/page_table.hh"
#include "mem/translating_port.hh"
#include "sim/system.hh"

using namespace std;
using namespace SparcISA;


SparcLiveProcess::SparcLiveProcess(const std::string &nm, ObjectFile *objFile,
        System *_system, int stdin_fd, int stdout_fd, int stderr_fd,
        std::vector<std::string> &argv, std::vector<std::string> &envp)
    : LiveProcess(nm, objFile, _system, stdin_fd, stdout_fd, stderr_fd,
        argv, envp)
{

    // XXX all the below need to be updated for SPARC - Ali
    brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
    brk_point = roundUp(brk_point, VMPageSize);

    // Set up stack. On SPARC Linux, stack goes from the top of memory
    // downward, less the hole for the kernel address space.
    stack_base = ((Addr)0x80000000000ULL);

    // Set up region for mmaps.  Tru64 seems to start just above 0 and
    // grow up from there.
    mmap_start = mmap_end = 0x800000;

    // Set pointer for next thread stack.  Reserve 8M for main stack.
    next_thread_stack_base = stack_base - (8 * 1024 * 1024);
}

void
SparcLiveProcess::startup()
{
    argsInit(MachineBytes, VMPageSize);

    //From the SPARC ABI

    //The process runs in user mode
    threadContexts[0]->setMiscRegWithEffect(MISCREG_PSTATE, 0x02);

    //Setup default FP state
    threadContexts[0]->setMiscReg(MISCREG_FSR, 0);

    threadContexts[0]->setMiscReg(MISCREG_TICK, 0);
    //
    /*
     * Register window management registers
     */

    //No windows contain info from other programs
    threadContexts[0]->setMiscRegWithEffect(MISCREG_OTHERWIN, 0);
    //There are no windows to pop
    threadContexts[0]->setMiscRegWithEffect(MISCREG_CANRESTORE, 0);
    //All windows are available to save into
    threadContexts[0]->setMiscRegWithEffect(MISCREG_CANSAVE, NWindows - 2);
    //All windows are "clean"
    threadContexts[0]->setMiscRegWithEffect(MISCREG_CLEANWIN, NWindows);
    //Start with register window 0
    threadContexts[0]->setMiscRegWithEffect(MISCREG_CWP, 0);
}

m5_auxv_t buildAuxVect(int64_t type, int64_t val)
{
    m5_auxv_t result;
    result.a_type = TheISA::htog(type);
    result.a_val = TheISA::htog(val);
    return result;
}

void
SparcLiveProcess::argsInit(int intSize, int pageSize)
{
    Process::startup();

    Addr alignmentMask = ~(intSize - 1);

    // load object file into target memory
    objFile->loadSections(initVirtMem);

    //These are the auxilliary vector types
    enum auxTypes
    {
        SPARC_AT_HWCAP = 16,
        SPARC_AT_PAGESZ = 6,
        SPARC_AT_CLKTCK = 17,
        SPARC_AT_PHDR = 3,
        SPARC_AT_PHENT = 4,
        SPARC_AT_PHNUM = 5,
        SPARC_AT_BASE = 7,
        SPARC_AT_FLAGS = 8,
        SPARC_AT_ENTRY = 9,
        SPARC_AT_UID = 11,
        SPARC_AT_EUID = 12,
        SPARC_AT_GID = 13,
        SPARC_AT_EGID = 14,
        SPARC_AT_SECURE = 23
    };

    enum hardwareCaps
    {
        M5_HWCAP_SPARC_FLUSH = 1,
        M5_HWCAP_SPARC_STBAR = 2,
        M5_HWCAP_SPARC_SWAP = 4,
        M5_HWCAP_SPARC_MULDIV = 8,
        M5_HWCAP_SPARC_V9 = 16,
        //This one should technically only be set
        //if there is a cheetah or cheetah_plus tlb,
        //but we'll use it all the time
        M5_HWCAP_SPARC_ULTRA3 = 32
    };

    const int64_t hwcap =
        M5_HWCAP_SPARC_FLUSH |
        M5_HWCAP_SPARC_STBAR |
        M5_HWCAP_SPARC_SWAP |
        M5_HWCAP_SPARC_MULDIV |
        M5_HWCAP_SPARC_V9 |
        M5_HWCAP_SPARC_ULTRA3;


    //Setup the auxilliary vectors. These will already have endian conversion.
    //Auxilliary vectors are loaded only for elf formatted executables.
    ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
    if(elfObject)
    {
        //Bits which describe the system hardware capabilities
        auxv.push_back(buildAuxVect(SPARC_AT_HWCAP, hwcap));
        //The system page size
        auxv.push_back(buildAuxVect(SPARC_AT_PAGESZ, SparcISA::VMPageSize));
        //Defined to be 100 in the kernel source.
        //Frequency at which times() increments
        auxv.push_back(buildAuxVect(SPARC_AT_CLKTCK, 100));
        // For statically linked executables, this is the virtual address of the
        // program header tables if they appear in the executable image
        auxv.push_back(buildAuxVect(SPARC_AT_PHDR, elfObject->programHeaderTable()));
        // This is the size of a program header entry from the elf file.
        auxv.push_back(buildAuxVect(SPARC_AT_PHENT, elfObject->programHeaderSize()));
        // This is the number of program headers from the original elf file.
        auxv.push_back(buildAuxVect(SPARC_AT_PHNUM, elfObject->programHeaderCount()));
        //This is the address of the elf "interpreter", It should be set
        //to 0 for regular executables. It should be something else
        //(not sure what) for dynamic libraries.
        auxv.push_back(buildAuxVect(SPARC_AT_BASE, 0));
        //This is hardwired to 0 in the elf loading code in the kernel
        auxv.push_back(buildAuxVect(SPARC_AT_FLAGS, 0));
        //The entry point to the program
        auxv.push_back(buildAuxVect(SPARC_AT_ENTRY, objFile->entryPoint()));
        //Different user and group IDs
        auxv.push_back(buildAuxVect(SPARC_AT_UID, 100));
        auxv.push_back(buildAuxVect(SPARC_AT_EUID, 100));
        auxv.push_back(buildAuxVect(SPARC_AT_GID, 100));
        auxv.push_back(buildAuxVect(SPARC_AT_EGID, 100));
        //Whether to enable "secure mode" in the executable
        auxv.push_back(buildAuxVect(SPARC_AT_SECURE, 0));
    }

    //Figure out how big the initial stack needs to be

    //Each auxilliary vector is two 8 byte words
    int aux_data_size = 2 * intSize * auxv.size();
    int env_data_size = 0;
    for (int i = 0; i < envp.size(); ++i) {
        env_data_size += envp[i].size() + 1;
    }
    int arg_data_size = 0;
    for (int i = 0; i < argv.size(); ++i) {
        arg_data_size += argv[i].size() + 1;
    }

    int aux_array_size = intSize * 2 * (auxv.size() + 1);

    int argv_array_size = intSize * (argv.size() + 1);
    int envp_array_size = intSize * (envp.size() + 1);

    int argc_size = intSize;
    int window_save_size = intSize * 16;

    int info_block_size =
        (aux_data_size +
        env_data_size +
        arg_data_size +
        ~alignmentMask) & alignmentMask;

    int info_block_padding =
        info_block_size -
        aux_data_size -
        env_data_size -
        arg_data_size;

    int space_needed =
        info_block_size +
        aux_array_size +
        envp_array_size +
        argv_array_size +
        argc_size +
        window_save_size;

    stack_min = stack_base - space_needed;
    stack_min &= alignmentMask;
    stack_size = stack_base - stack_min;

    // map memory
    pTable->allocate(roundDown(stack_min, pageSize),
                     roundUp(stack_size, pageSize));

    // map out initial stack contents
    Addr aux_data_base = stack_base - aux_data_size - info_block_padding;
    Addr env_data_base = aux_data_base - env_data_size;
    Addr arg_data_base = env_data_base - arg_data_size;
    Addr auxv_array_base = arg_data_base - aux_array_size;
    Addr envp_array_base = auxv_array_base - envp_array_size;
    Addr argv_array_base = envp_array_base - argv_array_size;
    Addr argc_base = argv_array_base - argc_size;
    Addr window_save_base = argc_base - window_save_size;

    DPRINTF(Sparc, "The addresses of items on the initial stack:\n");
    DPRINTF(Sparc, "0x%x - aux data\n", aux_data_base);
    DPRINTF(Sparc, "0x%x - env data\n", env_data_base);
    DPRINTF(Sparc, "0x%x - arg data\n", arg_data_base);
    DPRINTF(Sparc, "0x%x - auxv array\n", auxv_array_base);
    DPRINTF(Sparc, "0x%x - envp array\n", envp_array_base);
    DPRINTF(Sparc, "0x%x - argv array\n", argv_array_base);
    DPRINTF(Sparc, "0x%x - argc \n", argc_base);
    DPRINTF(Sparc, "0x%x - window save\n", window_save_base);
    DPRINTF(Sparc, "0x%x - stack min\n", stack_min);

    // write contents to stack
    uint64_t argc = argv.size();
    uint64_t guestArgc = TheISA::htog(argc);

    //Copy the aux stuff
    for(int x = 0; x < auxv.size(); x++)
    {
        initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
                (uint8_t*)&(auxv[x].a_type), intSize);
        initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
                (uint8_t*)&(auxv[x].a_val), intSize);
    }
    //Write out the terminating zeroed auxilliary vector
    const uint64_t zero = 0;
    initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
            (uint8_t*)&zero, 2 * intSize);

    copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
    copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);

    initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);

    threadContexts[0]->setIntReg(ArgumentReg0, argc);
    threadContexts[0]->setIntReg(ArgumentReg1, argv_array_base);
    threadContexts[0]->setIntReg(StackPointerReg, stack_min - StackBias);

    Addr prog_entry = objFile->entryPoint();
    threadContexts[0]->setPC(prog_entry);
    threadContexts[0]->setNextPC(prog_entry + sizeof(MachInst));
    threadContexts[0]->setNextNPC(prog_entry + (2 * sizeof(MachInst)));

//    num_processes++;
}
