src/arch/alpha/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/alpha/process.hh"
  33
  34 #include "arch/alpha/isa_traits.hh"
  35 #include "base/loader/elf_object.hh"
  36 #include "base/loader/object_file.hh"
  37 #include "base/misc.hh"
  38 #include "cpu/thread_context.hh"
  39 #include "debug/Loader.hh"
  40 #include "mem/page_table.hh"
  41 #include "sim/aux_vector.hh"
  42 #include "sim/byteswap.hh"
  43 #include "sim/process_impl.hh"
  44 #include "sim/syscall_return.hh"
  45 #include "sim/system.hh"
  46
  47 using namespace AlphaISA;
  48 using namespace std;
  49
  50 AlphaProcess::AlphaProcess(ProcessParams *params, ObjectFile *objFile)
  51     : Process(params, objFile)
  52 {
  53     Addr brk_point = objFile->dataBase() + objFile->dataSize() +
  54                      objFile->bssSize();
  55     brk_point = roundUp(brk_point, PageBytes);
  56
  57     // Set up stack.  On Alpha, stack goes below text section.  This
  58     // code should get moved to some architecture-specific spot.
  59     Addr stack_base = objFile->textBase() - (409600+4096);
  60
  61     // Set up region for mmaps.
  62     Addr mmap_end = 0x10000;
  63
  64     Addr max_stack_size = 8 * 1024 * 1024;
  65
  66     // Set pointer for next thread stack.  Reserve 8M for main stack.
  67     Addr next_thread_stack_base = stack_base - max_stack_size;
  68
  69     memState = make_shared<MemState>(brk_point, stack_base, max_stack_size,
  70                                      next_thread_stack_base, mmap_end);
  71 }
  72
  73 void
  74 AlphaProcess::argsInit(int intSize, int pageSize)
  75 {
  76     // Patch the ld_bias for dynamic executables.
  77     updateBias();
  78
  79     objFile->loadSections(initVirtMem);
  80
  81     typedef AuxVector<uint64_t> auxv_t;
  82     std::vector<auxv_t>  auxv;
  83
  84     ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
  85     if (elfObject)
  86     {
  87         // modern glibc uses a bunch of auxiliary vectors to set up
  88         // TLS as well as do a bunch of other stuff
  89         // these vectors go on the bottom of the stack, below argc/argv/envp
  90         // pointers but above actual arg strings
  91         // I don't have all the ones glibc looks at here, but so far it doesn't
  92         // seem to be a problem.
  93         // check out _dl_aux_init() in glibc/elf/dl-support.c for details
  94         // --Lisa
  95         auxv.push_back(auxv_t(M5_AT_PAGESZ, AlphaISA::PageBytes));
  96         auxv.push_back(auxv_t(M5_AT_CLKTCK, 100));
  97         auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
  98         DPRINTF(Loader, "auxv at PHDR %08p\n", elfObject->programHeaderTable());
  99         auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
 100         // This is the base address of the ELF interpreter; it should be
 101         // zero for static executables or contain the base address for
 102         // dynamic executables.
 103         auxv.push_back(auxv_t(M5_AT_BASE, getBias()));
 104         auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
 105         auxv.push_back(auxv_t(M5_AT_UID, uid()));
 106         auxv.push_back(auxv_t(M5_AT_EUID, euid()));
 107         auxv.push_back(auxv_t(M5_AT_GID, gid()));
 108         auxv.push_back(auxv_t(M5_AT_EGID, egid()));
 109
 110     }
 111
 112     // Calculate how much space we need for arg & env & auxv arrays.
 113     int argv_array_size = intSize * (argv.size() + 1);
 114     int envp_array_size = intSize * (envp.size() + 1);
 115     int auxv_array_size = intSize * 2 * (auxv.size() + 1);
 116
 117     int arg_data_size = 0;
 118     for (vector<string>::size_type i = 0; i < argv.size(); ++i) {
 119         arg_data_size += argv[i].size() + 1;
 120     }
 121     int env_data_size = 0;
 122     for (vector<string>::size_type i = 0; i < envp.size(); ++i) {
 123         env_data_size += envp[i].size() + 1;
 124     }
 125
 126     int space_needed =
 127         argv_array_size +
 128         envp_array_size +
 129         auxv_array_size +
 130         arg_data_size +
 131         env_data_size;
 132
 133     if (space_needed < 32*1024)
 134         space_needed = 32*1024;
 135
 136     // set bottom of stack
 137     memState->setStackMin(memState->getStackBase() - space_needed);
 138     // align it
 139     memState->setStackMin(roundDown(memState->getStackMin(), pageSize));
 140     memState->setStackSize(memState->getStackBase() - memState->getStackMin());
 141     // map memory
 142     allocateMem(memState->getStackMin(), roundUp(memState->getStackSize(),
 143                 pageSize));
 144
 145     // map out initial stack contents
 146     Addr argv_array_base = memState->getStackMin() + intSize; // room for argc
 147     Addr envp_array_base = argv_array_base + argv_array_size;
 148     Addr auxv_array_base = envp_array_base + envp_array_size;
 149     Addr arg_data_base = auxv_array_base + auxv_array_size;
 150     Addr env_data_base = arg_data_base + arg_data_size;
 151
 152     // write contents to stack
 153     uint64_t argc = argv.size();
 154     if (intSize == 8)
 155         argc = htog((uint64_t)argc);
 156     else if (intSize == 4)
 157         argc = htog((uint32_t)argc);
 158     else
 159         panic("Unknown int size");
 160
 161     initVirtMem.writeBlob(memState->getStackMin(), (uint8_t*)&argc, intSize);
 162
 163     copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
 164     copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
 165
 166     //Copy the aux stuff
 167     for (vector<auxv_t>::size_type x = 0; x < auxv.size(); x++) {
 168         initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize,
 169                 (uint8_t*)&(auxv[x].a_type), intSize);
 170         initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
 171                 (uint8_t*)&(auxv[x].a_val), intSize);
 172     }
 173
 174     ThreadContext *tc = system->getThreadContext(contextIds[0]);
 175
 176     setSyscallArg(tc, 0, argc);
 177     setSyscallArg(tc, 1, argv_array_base);
 178     tc->setIntReg(StackPointerReg, memState->getStackMin());
 179
 180     tc->pcState(getStartPC());
 181 }
 182
 183 void
 184 AlphaProcess::setupASNReg()
 185 {
 186     ThreadContext *tc = system->getThreadContext(contextIds[0]);
 187     tc->setMiscRegNoEffect(IPR_DTB_ASN, _pid << 57);
 188 }
 189
 190
 191 void
 192 AlphaProcess::unserialize(CheckpointIn &cp)
 193 {
 194     Process::unserialize(cp);
 195     // need to set up ASN after unserialization since _pid value may
 196     // come from checkpoint
 197     setupASNReg();
 198 }
 199
 200
 201 void
 202 AlphaProcess::initState()
 203 {
 204     // need to set up ASN before further initialization since init
 205     // will involve writing to virtual memory addresses
 206     setupASNReg();
 207
 208     Process::initState();
 209
 210     argsInit(MachineBytes, PageBytes);
 211
 212     ThreadContext *tc = system->getThreadContext(contextIds[0]);
 213     tc->setIntReg(GlobalPointerReg, objFile->globalPointer());
 214     //Operate in user mode
 215     tc->setMiscRegNoEffect(IPR_ICM, mode_user << 3);
 216     tc->setMiscRegNoEffect(IPR_DTB_CM, mode_user << 3);
 217     //No super page mapping
 218     tc->setMiscRegNoEffect(IPR_MCSR, 0);
 219 }
 220
 221 AlphaISA::IntReg
 222 AlphaProcess::getSyscallArg(ThreadContext *tc, int &i)
 223 {
 224     assert(i < 6);
 225     return tc->readIntReg(FirstArgumentReg + i++);
 226 }
 227
 228 void
 229 AlphaProcess::setSyscallArg(ThreadContext *tc, int i, AlphaISA::IntReg val)
 230 {
 231     assert(i < 6);
 232     tc->setIntReg(FirstArgumentReg + i, val);
 233 }
 234
 235 void
 236 AlphaProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret)
 237 {
 238     // check for error condition.  Alpha syscall convention is to
 239     // indicate success/failure in reg a3 (r19) and put the
 240     // return value itself in the standard return value reg (v0).
 241     if (sysret.successful()) {
 242         // no error
 243         tc->setIntReg(SyscallSuccessReg, 0);
 244         tc->setIntReg(ReturnValueReg, sysret.returnValue());
 245     } else {
 246         // got an error, return details
 247         tc->setIntReg(SyscallSuccessReg, (IntReg)-1);
 248         tc->setIntReg(ReturnValueReg, sysret.errnoValue());
 249     }
 250 }