src/arch/mips/process.cc

   1 /*
   2  * Copyright (c) 2004-2005 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  *          Korey Sewell
  31  */
  32
  33 #include "arch/mips/process.hh"
  34
  35 #include "arch/mips/isa_traits.hh"
  36 #include "base/loader/elf_object.hh"
  37 #include "base/loader/object_file.hh"
  38 #include "base/misc.hh"
  39 #include "cpu/thread_context.hh"
  40 #include "debug/Loader.hh"
  41 #include "mem/page_table.hh"
  42 #include "sim/process.hh"
  43 #include "sim/process_impl.hh"
  44 #include "sim/system.hh"
  45
  46 using namespace std;
  47 using namespace MipsISA;
  48
  49 MipsLiveProcess::MipsLiveProcess(LiveProcessParams * params,
  50         ObjectFile *objFile)
  51     : LiveProcess(params, objFile)
  52 {
  53     // Set up stack. On MIPS, stack starts at the top of kuseg
  54     // user address space. MIPS stack grows down from here
  55     stack_base = 0x7FFFFFFF;
  56
  57     // Set pointer for next thread stack.  Reserve 8M for main stack.
  58     next_thread_stack_base = stack_base - (8 * 1024 * 1024);
  59
  60     // Set up break point (Top of Heap)
  61     brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
  62     brk_point = roundUp(brk_point, PageBytes);
  63
  64     // Set up region for mmaps.  Start it 1GB above the top of the heap.
  65     mmap_end = brk_point + 0x40000000L;
  66 }
  67
  68 void
  69 MipsLiveProcess::initState()
  70 {
  71     LiveProcess::initState();
  72
  73     argsInit<uint32_t>(PageBytes);
  74 }
  75
  76 template<class IntType>
  77 void
  78 MipsLiveProcess::argsInit(int pageSize)
  79 {
  80     int intSize = sizeof(IntType);
  81
  82     // Patch the ld_bias for dynamic executables.
  83     updateBias();
  84
  85     // load object file into target memory
  86     objFile->loadSections(initVirtMem);
  87
  88     typedef AuxVector<IntType> auxv_t;
  89     std::vector<auxv_t> auxv;
  90
  91     ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
  92     if (elfObject)
  93     {
  94         // Set the system page size
  95         auxv.push_back(auxv_t(M5_AT_PAGESZ, MipsISA::PageBytes));
  96         // Set the frequency at which time() increments
  97         auxv.push_back(auxv_t(M5_AT_CLKTCK, 100));
  98         // For statically linked executables, this is the virtual
  99         // address of the program header tables if they appear in the
 100         // executable image.
 101         auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
 102         DPRINTF(Loader, "auxv at PHDR %08p\n", elfObject->programHeaderTable());
 103         // This is the size of a program header entry from the elf file.
 104         auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize()));
 105         // This is the number of program headers from the original elf file.
 106         auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
 107         // This is the base address of the ELF interpreter; it should be
 108         // zero for static executables or contain the base address for
 109         // dynamic executables.
 110         auxv.push_back(auxv_t(M5_AT_BASE, getBias()));
 111         //The entry point to the program
 112         auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
 113         //Different user and group IDs
 114         auxv.push_back(auxv_t(M5_AT_UID, uid()));
 115         auxv.push_back(auxv_t(M5_AT_EUID, euid()));
 116         auxv.push_back(auxv_t(M5_AT_GID, gid()));
 117         auxv.push_back(auxv_t(M5_AT_EGID, egid()));
 118     }
 119
 120     // Calculate how much space we need for arg & env & auxv arrays.
 121     int argv_array_size = intSize * (argv.size() + 1);
 122     int envp_array_size = intSize * (envp.size() + 1);
 123     int auxv_array_size = intSize * 2 * (auxv.size() + 1);
 124
 125     int arg_data_size = 0;
 126     for (vector<string>::size_type i = 0; i < argv.size(); ++i) {
 127         arg_data_size += argv[i].size() + 1;
 128     }
 129     int env_data_size = 0;
 130     for (vector<string>::size_type i = 0; i < envp.size(); ++i) {
 131         env_data_size += envp[i].size() + 1;
 132     }
 133
 134     int space_needed =
 135         argv_array_size +
 136         envp_array_size +
 137         auxv_array_size +
 138         arg_data_size +
 139         env_data_size;
 140
 141     // set bottom of stack
 142     stack_min = stack_base - space_needed;
 143     // align it
 144     stack_min = roundDown(stack_min, pageSize);
 145     stack_size = stack_base - stack_min;
 146     // map memory
 147     allocateMem(stack_min, roundUp(stack_size, pageSize));
 148
 149     // map out initial stack contents
 150     IntType argv_array_base = stack_min + intSize; // room for argc
 151     IntType envp_array_base = argv_array_base + argv_array_size;
 152     IntType auxv_array_base = envp_array_base + envp_array_size;
 153     IntType arg_data_base = auxv_array_base + auxv_array_size;
 154     IntType env_data_base = arg_data_base + arg_data_size;
 155
 156     // write contents to stack
 157     IntType argc = argv.size();
 158
 159     argc = htog((IntType)argc);
 160
 161     initVirtMem.writeBlob(stack_min, (uint8_t*)&argc, intSize);
 162
 163     copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
 164
 165     copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
 166
 167     // Copy the aux vector
 168     for (typename vector<auxv_t>::size_type x = 0; x < auxv.size(); x++) {
 169         initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize,
 170                 (uint8_t*)&(auxv[x].a_type), intSize);
 171         initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
 172                 (uint8_t*)&(auxv[x].a_val), intSize);
 173     }
 174
 175     // Write out the terminating zeroed auxilliary vector
 176     for (unsigned i = 0; i < 2; i++) {
 177         const IntType zero = 0;
 178         const Addr addr = auxv_array_base + 2 * intSize * (auxv.size() + i);
 179         initVirtMem.writeBlob(addr, (uint8_t*)&zero, intSize);
 180     }
 181
 182     ThreadContext *tc = system->getThreadContext(contextIds[0]);
 183
 184     setSyscallArg(tc, 0, argc);
 185     setSyscallArg(tc, 1, argv_array_base);
 186     tc->setIntReg(StackPointerReg, stack_min);
 187
 188     tc->pcState(getStartPC());
 189 }
 190
 191
 192 MipsISA::IntReg
 193 MipsLiveProcess::getSyscallArg(ThreadContext *tc, int &i)
 194 {
 195     assert(i < 6);
 196     return tc->readIntReg(FirstArgumentReg + i++);
 197 }
 198
 199 void
 200 MipsLiveProcess::setSyscallArg(ThreadContext *tc,
 201         int i, MipsISA::IntReg val)
 202 {
 203     assert(i < 6);
 204     tc->setIntReg(FirstArgumentReg + i, val);
 205 }
 206
 207 void
 208 MipsLiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret)
 209 {
 210     if (sysret.successful()) {
 211         // no error
 212         tc->setIntReg(SyscallSuccessReg, 0);
 213         tc->setIntReg(ReturnValueReg, sysret.returnValue());
 214     } else {
 215         // got an error, return details
 216         tc->setIntReg(SyscallSuccessReg, (IntReg) -1);
 217         tc->setIntReg(ReturnValueReg, sysret.errnoValue());
 218     }
 219 }