src/arch/sparc/process.cc

   1 /*
   2  * Copyright (c) 2003-2004 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Gabe Black
  29  *          Ali Saidi
  30  */
  31
  32 #include "arch/sparc/isa_traits.hh"
  33 #include "arch/sparc/process.hh"
  34 #include "base/loader/object_file.hh"
  35 #include "base/misc.hh"
  36 #include "cpu/thread_context.hh"
  37 #include "mem/page_table.hh"
  38 #include "mem/translating_port.hh"
  39 #include "sim/system.hh"
  40
  41 using namespace std;
  42 using namespace SparcISA;
  43
  44
  45 SparcLiveProcess::SparcLiveProcess(const std::string &nm, ObjectFile *objFile,
  46         System *_system, int stdin_fd, int stdout_fd, int stderr_fd,
  47         std::vector<std::string> &argv, std::vector<std::string> &envp)
  48     : LiveProcess(nm, objFile, _system, stdin_fd, stdout_fd, stderr_fd,
  49         argv, envp)
  50 {
  51
  52     // XXX all the below need to be updated for SPARC - Ali
  53     brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
  54     brk_point = roundUp(brk_point, VMPageSize);
  55
  56     // Set up stack. On SPARC Linux, stack goes from the top of memory
  57     // downward, less the hole for the kernel address space.
  58     stack_base = ((Addr)0x80000000000ULL);
  59
  60     // Set up region for mmaps.  Tru64 seems to start just above 0 and
  61     // grow up from there.
  62     mmap_start = mmap_end = 0x800000;
  63
  64     // Set pointer for next thread stack.  Reserve 8M for main stack.
  65     next_thread_stack_base = stack_base - (8 * 1024 * 1024);
  66 }
  67
  68 void
  69 SparcLiveProcess::startup()
  70 {
  71     argsInit(MachineBytes, VMPageSize);
  72
  73     //From the SPARC ABI
  74
  75     //The process runs in user mode
  76     threadContexts[0]->setMiscRegWithEffect(MISCREG_PSTATE, 0x02);
  77
  78     //Setup default FP state
  79     threadContexts[0]->setMiscReg(MISCREG_FSR, 0);
  80
  81     threadContexts[0]->setMiscReg(MISCREG_TICK, 0);
  82     //
  83     /*
  84      * Register window management registers
  85      */
  86
  87     //No windows contain info from other programs
  88     threadContexts[0]->setMiscRegWithEffect(MISCREG_OTHERWIN, 0);
  89     //There are no windows to pop
  90     threadContexts[0]->setMiscRegWithEffect(MISCREG_CANRESTORE, 0);
  91     //All windows are available to save into
  92     threadContexts[0]->setMiscRegWithEffect(MISCREG_CANSAVE, NWindows - 2);
  93     //All windows are "clean"
  94     threadContexts[0]->setMiscRegWithEffect(MISCREG_CLEANWIN, NWindows);
  95     //Start with register window 0
  96     threadContexts[0]->setMiscRegWithEffect(MISCREG_CWP, 0);
  97 }
  98
  99 m5_auxv_t buildAuxVect(int64_t type, int64_t val)
 100 {
 101     m5_auxv_t result;
 102     result.a_type = TheISA::htog(type);
 103     result.a_val = TheISA::htog(val);
 104     return result;
 105 }
 106
 107 void
 108 SparcLiveProcess::argsInit(int intSize, int pageSize)
 109 {
 110     Process::startup();
 111
 112     Addr alignmentMask = ~(intSize - 1);
 113
 114     // load object file into target memory
 115     objFile->loadSections(initVirtMem);
 116
 117     //These are the auxilliary vector types
 118     enum auxTypes
 119     {
 120         SPARC_AT_HWCAP = 16,
 121         SPARC_AT_PAGESZ = 6,
 122         SPARC_AT_CLKTCK = 17,
 123         SPARC_AT_PHDR = 3,
 124         SPARC_AT_PHENT = 4,
 125         SPARC_AT_PHNUM = 5,
 126         SPARC_AT_BASE = 7,
 127         SPARC_AT_FLAGS = 8,
 128         SPARC_AT_ENTRY = 9,
 129         SPARC_AT_UID = 11,
 130         SPARC_AT_EUID = 12,
 131         SPARC_AT_GID = 13,
 132         SPARC_AT_EGID = 14
 133     };
 134
 135     enum hardwareCaps
 136     {
 137         M5_HWCAP_SPARC_FLUSH = 1,
 138         M5_HWCAP_SPARC_STBAR = 2,
 139         M5_HWCAP_SPARC_SWAP = 4,
 140         M5_HWCAP_SPARC_MULDIV = 8,
 141         M5_HWCAP_SPARC_V9 = 16,
 142         //This one should technically only be set
 143         //if there is a cheetah or cheetah_plus tlb,
 144         //but we'll use it all the time
 145         M5_HWCAP_SPARC_ULTRA3 = 32
 146     };
 147
 148     const int64_t hwcap =
 149         M5_HWCAP_SPARC_FLUSH |
 150         M5_HWCAP_SPARC_STBAR |
 151         M5_HWCAP_SPARC_SWAP |
 152         M5_HWCAP_SPARC_MULDIV |
 153         M5_HWCAP_SPARC_V9 |
 154         M5_HWCAP_SPARC_ULTRA3;
 155
 156     //Setup the auxilliary vectors. These will already have
 157     //endian conversion.
 158     auxv.push_back(buildAuxVect(SPARC_AT_EGID, 100));
 159     auxv.push_back(buildAuxVect(SPARC_AT_GID, 100));
 160     auxv.push_back(buildAuxVect(SPARC_AT_EUID, 100));
 161     auxv.push_back(buildAuxVect(SPARC_AT_UID, 100));
 162     //This would work, but the entry point is a protected member
 163     //auxv.push_back(buildAuxVect(SPARC_AT_ENTRY, objFile->entry));
 164     auxv.push_back(buildAuxVect(SPARC_AT_FLAGS, 0));
 165     //This is the address of the elf "interpreter", which I don't
 166     //think we currently set up. It should be set to 0 (I think)
 167     //auxv.push_back(buildAuxVect(SPARC_AT_BASE, 0));
 168     //This is the number of headers which were in the original elf
 169     //file. This information isn't avaibale by this point.
 170     //auxv.push_back(buildAuxVect(SPARC_AT_PHNUM, 3));
 171     //This is the size of a program header entry. This isn't easy
 172     //to compute here.
 173     //auxv.push_back(buildAuxVect(SPARC_AT_PHENT, blah));
 174     //This is should be set to load_addr (whatever that is) +
 175     //e_phoff. I think it's a pointer to the program headers.
 176     //auxv.push_back(buildAuxVect(SPARC_AT_PHDR, blah));
 177     //This should be easy to get right, but I won't set it for now
 178     //auxv.push_back(buildAuxVect(SPARC_AT_CLKTCK, blah));
 179     auxv.push_back(buildAuxVect(SPARC_AT_PAGESZ, SparcISA::VMPageSize));
 180     auxv.push_back(buildAuxVect(SPARC_AT_HWCAP, hwcap));
 181
 182     //Figure out how big the initial stack needs to be
 183
 184     //Each auxilliary vector is two 8 byte words
 185     int aux_data_size = 2 * intSize * auxv.size();
 186     int env_data_size = 0;
 187     for (int i = 0; i < envp.size(); ++i) {
 188         env_data_size += envp[i].size() + 1;
 189     }
 190     int arg_data_size = 0;
 191     for (int i = 0; i < argv.size(); ++i) {
 192         arg_data_size += argv[i].size() + 1;
 193     }
 194
 195     int aux_array_size = intSize * 2 * (auxv.size() + 1);
 196
 197     int argv_array_size = intSize * (argv.size() + 1);
 198     int envp_array_size = intSize * (envp.size() + 1);
 199
 200     int argc_size = intSize;
 201     int window_save_size = intSize * 16;
 202
 203     int info_block_size =
 204         (aux_data_size +
 205         env_data_size +
 206         arg_data_size +
 207         ~alignmentMask) & alignmentMask;
 208
 209     int info_block_padding =
 210         info_block_size -
 211         aux_data_size -
 212         env_data_size -
 213         arg_data_size;
 214
 215     int space_needed =
 216         info_block_size +
 217         aux_array_size +
 218         envp_array_size +
 219         argv_array_size +
 220         argc_size +
 221         window_save_size;
 222
 223     stack_min = stack_base - space_needed;
 224     stack_min &= alignmentMask;
 225     stack_size = stack_base - stack_min;
 226
 227     // map memory
 228     pTable->allocate(roundDown(stack_min, pageSize),
 229                      roundUp(stack_size, pageSize));
 230
 231     // map out initial stack contents
 232     Addr aux_data_base = stack_base - aux_data_size - info_block_padding;
 233     Addr env_data_base = aux_data_base - env_data_size;
 234     Addr arg_data_base = env_data_base - arg_data_size;
 235     Addr auxv_array_base = arg_data_base - aux_array_size;
 236     Addr envp_array_base = auxv_array_base - envp_array_size;
 237     Addr argv_array_base = envp_array_base - argv_array_size;
 238     Addr argc_base = argv_array_base - argc_size;
 239     Addr window_save_base = argc_base - window_save_size;
 240
 241     DPRINTF(Sparc, "The addresses of items on the initial stack:\n");
 242     DPRINTF(Sparc, "0x%x - aux data\n", aux_data_base);
 243     DPRINTF(Sparc, "0x%x - env data\n", env_data_base);
 244     DPRINTF(Sparc, "0x%x - arg data\n", arg_data_base);
 245     DPRINTF(Sparc, "0x%x - auxv array\n", auxv_array_base);
 246     DPRINTF(Sparc, "0x%x - envp array\n", envp_array_base);
 247     DPRINTF(Sparc, "0x%x - argv array\n", argv_array_base);
 248     DPRINTF(Sparc, "0x%x - argc \n", argc_base);
 249     DPRINTF(Sparc, "0x%x - window save\n", window_save_base);
 250     DPRINTF(Sparc, "0x%x - stack min\n", stack_min);
 251
 252     // write contents to stack
 253     uint64_t argc = argv.size();
 254     uint64_t guestArgc = TheISA::htog(argc);
 255
 256     //Copy the aux stuff
 257     for(int x = 0; x < auxv.size(); x++)
 258     {
 259         initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
 260                 (uint8_t*)&(auxv[x].a_type), intSize);
 261         initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
 262                 (uint8_t*)&(auxv[x].a_val), intSize);
 263     }
 264     //Write out the terminating zeroed auxilliary vector
 265     const uint64_t zero = 0;
 266     initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
 267             (uint8_t*)&zero, 2 * intSize);
 268
 269     copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
 270     copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
 271
 272     initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
 273
 274     threadContexts[0]->setIntReg(ArgumentReg0, argc);
 275     threadContexts[0]->setIntReg(ArgumentReg1, argv_array_base);
 276     threadContexts[0]->setIntReg(StackPointerReg, stack_min - StackBias);
 277
 278     Addr prog_entry = objFile->entryPoint();
 279     threadContexts[0]->setPC(prog_entry);
 280     threadContexts[0]->setNextPC(prog_entry + sizeof(MachInst));
 281     threadContexts[0]->setNextNPC(prog_entry + (2 * sizeof(MachInst)));
 282
 283 //    num_processes++;
 284 }