process.cc revision 12186
12SN/A/* 21762SN/A * Copyright (c) 2003-2004 The Regents of The University of Michigan 32SN/A * All rights reserved. 42SN/A * 52SN/A * Redistribution and use in source and binary forms, with or without 62SN/A * modification, are permitted provided that the following conditions are 72SN/A * met: redistributions of source code must retain the above copyright 82SN/A * notice, this list of conditions and the following disclaimer; 92SN/A * redistributions in binary form must reproduce the above copyright 102SN/A * notice, this list of conditions and the following disclaimer in the 112SN/A * documentation and/or other materials provided with the distribution; 122SN/A * neither the name of the copyright holders nor the names of its 132SN/A * contributors may be used to endorse or promote products derived from 142SN/A * this software without specific prior written permission. 152SN/A * 162SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 172SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 182SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 192SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 202SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 212SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 222SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 232SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 242SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 252SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 262SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665SN/A * 282665SN/A * Authors: Gabe Black 292SN/A * Ali Saidi 302SN/A */ 312SN/A 322SN/A#include "arch/alpha/process.hh" 332SN/A 342SN/A#include "arch/alpha/isa_traits.hh" 3511263Sandreas.sandberg@arm.com#include "base/loader/elf_object.hh" 3611263Sandreas.sandberg@arm.com#include "base/loader/object_file.hh" 372SN/A#include "base/misc.hh" 382SN/A#include "cpu/thread_context.hh" 392SN/A#include "debug/Loader.hh" 402SN/A#include "mem/page_table.hh" 414981SN/A#include "sim/aux_vector.hh" 4212056Sgabeblack@google.com#include "sim/byteswap.hh" 4311263Sandreas.sandberg@arm.com#include "sim/process_impl.hh" 4411263Sandreas.sandberg@arm.com#include "sim/syscall_return.hh" 4511263Sandreas.sandberg@arm.com#include "sim/system.hh" 4612056Sgabeblack@google.com 4712056Sgabeblack@google.comusing namespace AlphaISA; 4812056Sgabeblack@google.comusing namespace std; 4912056Sgabeblack@google.com 5012056Sgabeblack@google.comAlphaProcess::AlphaProcess(ProcessParams *params, ObjectFile *objFile) 5112056Sgabeblack@google.com : Process(params, objFile) 5212054Sgabeblack@google.com{ 5356SN/A Addr brk_point = objFile->dataBase() + objFile->dataSize() + 5456SN/A objFile->bssSize(); 552SN/A brk_point = roundUp(brk_point, PageBytes); 561872SN/A 5712055Sgabeblack@google.com // Set up stack. On Alpha, stack goes below text section. This 5812055Sgabeblack@google.com // code should get moved to some architecture-specific spot. 5912055Sgabeblack@google.com Addr stack_base = objFile->textBase() - (409600+4096); 6012055Sgabeblack@google.com 6112055Sgabeblack@google.com // Set up region for mmaps. 6212055Sgabeblack@google.com Addr mmap_end = 0x10000; 6312055Sgabeblack@google.com 6412055Sgabeblack@google.com Addr max_stack_size = 8 * 1024 * 1024; 6512055Sgabeblack@google.com 6612055Sgabeblack@google.com // Set pointer for next thread stack. Reserve 8M for main stack. 6712055Sgabeblack@google.com Addr next_thread_stack_base = stack_base - max_stack_size; 6812055Sgabeblack@google.com 6912055Sgabeblack@google.com memState = make_shared<MemState>(brk_point, stack_base, max_stack_size, 7012055Sgabeblack@google.com next_thread_stack_base, mmap_end); 7112055Sgabeblack@google.com} 7212055Sgabeblack@google.com 7312055Sgabeblack@google.comvoid 7412055Sgabeblack@google.comAlphaProcess::argsInit(int intSize, int pageSize) 7512055Sgabeblack@google.com{ 7612055Sgabeblack@google.com // Patch the ld_bias for dynamic executables. 7712055Sgabeblack@google.com updateBias(); 7812055Sgabeblack@google.com 7912055Sgabeblack@google.com objFile->loadSections(initVirtMem); 8012055Sgabeblack@google.com 8112055Sgabeblack@google.com typedef AuxVector<uint64_t> auxv_t; 8212055Sgabeblack@google.com std::vector<auxv_t> auxv; 8312055Sgabeblack@google.com 8412055Sgabeblack@google.com ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 8512055Sgabeblack@google.com if (elfObject) 8612055Sgabeblack@google.com { 8712055Sgabeblack@google.com // modern glibc uses a bunch of auxiliary vectors to set up 8812055Sgabeblack@google.com // TLS as well as do a bunch of other stuff 8912055Sgabeblack@google.com // these vectors go on the bottom of the stack, below argc/argv/envp 9012055Sgabeblack@google.com // pointers but above actual arg strings 9112055Sgabeblack@google.com // I don't have all the ones glibc looks at here, but so far it doesn't 9212055Sgabeblack@google.com // seem to be a problem. 9312055Sgabeblack@google.com // check out _dl_aux_init() in glibc/elf/dl-support.c for details 9412055Sgabeblack@google.com // --Lisa 9512055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_PAGESZ, AlphaISA::PageBytes)); 9612055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 9712055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 9812055Sgabeblack@google.com DPRINTF(Loader, "auxv at PHDR %08p\n", elfObject->programHeaderTable()); 9912055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 10012055Sgabeblack@google.com // This is the base address of the ELF interpreter; it should be 10112055Sgabeblack@google.com // zero for static executables or contain the base address for 10212055Sgabeblack@google.com // dynamic executables. 10312055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_BASE, getBias())); 10412055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 10512055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_UID, uid())); 10612055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_EUID, euid())); 10712055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_GID, gid())); 10812055Sgabeblack@google.com auxv.push_back(auxv_t(M5_AT_EGID, egid())); 10912055Sgabeblack@google.com 11012055Sgabeblack@google.com } 11112055Sgabeblack@google.com 11212055Sgabeblack@google.com // Calculate how much space we need for arg & env & auxv arrays. 11312055Sgabeblack@google.com int argv_array_size = intSize * (argv.size() + 1); 11412055Sgabeblack@google.com int envp_array_size = intSize * (envp.size() + 1); 11512055Sgabeblack@google.com int auxv_array_size = intSize * 2 * (auxv.size() + 1); 11612055Sgabeblack@google.com 11712055Sgabeblack@google.com int arg_data_size = 0; 11812055Sgabeblack@google.com for (vector<string>::size_type i = 0; i < argv.size(); ++i) { 11912055Sgabeblack@google.com arg_data_size += argv[i].size() + 1; 12012055Sgabeblack@google.com } 12112055Sgabeblack@google.com int env_data_size = 0; 12212055Sgabeblack@google.com for (vector<string>::size_type i = 0; i < envp.size(); ++i) { 12312055Sgabeblack@google.com env_data_size += envp[i].size() + 1; 12412055Sgabeblack@google.com } 12512055Sgabeblack@google.com 12612055Sgabeblack@google.com int space_needed = 12712055Sgabeblack@google.com argv_array_size + 12812055Sgabeblack@google.com envp_array_size + 12912055Sgabeblack@google.com auxv_array_size + 13012055Sgabeblack@google.com arg_data_size + 13112055Sgabeblack@google.com env_data_size; 13212055Sgabeblack@google.com 13312055Sgabeblack@google.com if (space_needed < 32*1024) 13412055Sgabeblack@google.com space_needed = 32*1024; 13512055Sgabeblack@google.com 13612055Sgabeblack@google.com // set bottom of stack 13712055Sgabeblack@google.com memState->setStackMin(memState->getStackBase() - space_needed); 13812055Sgabeblack@google.com // align it 13912055Sgabeblack@google.com memState->setStackMin(roundDown(memState->getStackMin(), pageSize)); 14012055Sgabeblack@google.com memState->setStackSize(memState->getStackBase() - memState->getStackMin()); 14112055Sgabeblack@google.com // map memory 14212055Sgabeblack@google.com allocateMem(memState->getStackMin(), roundUp(memState->getStackSize(), 14312055Sgabeblack@google.com pageSize)); 1441872SN/A 1451872SN/A // map out initial stack contents 1462SN/A Addr argv_array_base = memState->getStackMin() + intSize; // room for argc 14712054Sgabeblack@google.com Addr envp_array_base = argv_array_base + argv_array_size; 14812054Sgabeblack@google.com Addr auxv_array_base = envp_array_base + envp_array_size; 14912054Sgabeblack@google.com Addr arg_data_base = auxv_array_base + auxv_array_size; 15012054Sgabeblack@google.com Addr env_data_base = arg_data_base + arg_data_size; 1512SN/A 15212055Sgabeblack@google.com // write contents to stack 1532SN/A uint64_t argc = argv.size(); 1542SN/A if (intSize == 8) 15512054Sgabeblack@google.com argc = htog((uint64_t)argc); 15612054Sgabeblack@google.com else if (intSize == 4) 15712055Sgabeblack@google.com argc = htog((uint32_t)argc); 1582SN/A else 1594981SN/A panic("Unknown int size"); 1604981SN/A 1614981SN/A initVirtMem.writeBlob(memState->getStackMin(), (uint8_t*)&argc, intSize); 1624981SN/A 1634981SN/A copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 1644981SN/A copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 16511168SN/A 16611168SN/A //Copy the aux stuff 16712055Sgabeblack@google.com for (vector<auxv_t>::size_type x = 0; x < auxv.size(); x++) { 16812055Sgabeblack@google.com initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 16912055Sgabeblack@google.com (uint8_t*)&(auxv[x].a_type), intSize); 17012055Sgabeblack@google.com initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 17112055Sgabeblack@google.com (uint8_t*)&(auxv[x].a_val), intSize); 17212055Sgabeblack@google.com } 17312055Sgabeblack@google.com 17412055Sgabeblack@google.com ThreadContext *tc = system->getThreadContext(contextIds[0]); 17512055Sgabeblack@google.com 17612055Sgabeblack@google.com setSyscallArg(tc, 0, argc); 17712055Sgabeblack@google.com setSyscallArg(tc, 1, argv_array_base); 17812055Sgabeblack@google.com tc->setIntReg(StackPointerReg, memState->getStackMin()); 17912055Sgabeblack@google.com 18012055Sgabeblack@google.com tc->pcState(getStartPC()); 18112055Sgabeblack@google.com} 18212055Sgabeblack@google.com 1832SN/Avoid 1842SN/AAlphaProcess::setupASNReg() 1854981SN/A{ 18612056Sgabeblack@google.com ThreadContext *tc = system->getThreadContext(contextIds[0]); 18712056Sgabeblack@google.com tc->setMiscRegNoEffect(IPR_DTB_ASN, _pid << 57); 18812056Sgabeblack@google.com} 18912056Sgabeblack@google.com 19012056Sgabeblack@google.com 19112056Sgabeblack@google.comvoid 19212056Sgabeblack@google.comAlphaProcess::unserialize(CheckpointIn &cp) 19312056Sgabeblack@google.com{ 19412056Sgabeblack@google.com Process::unserialize(cp); 19512056Sgabeblack@google.com // need to set up ASN after unserialization since _pid value may 19612056Sgabeblack@google.com // come from checkpoint 19712056Sgabeblack@google.com setupASNReg(); 19812056Sgabeblack@google.com} 19912056Sgabeblack@google.com 20012056Sgabeblack@google.com 20112056Sgabeblack@google.comvoid 20212056Sgabeblack@google.comAlphaProcess::initState() 20312056Sgabeblack@google.com{ 20412056Sgabeblack@google.com // need to set up ASN before further initialization since init 20512056Sgabeblack@google.com // will involve writing to virtual memory addresses 20612056Sgabeblack@google.com setupASNReg(); 20712056Sgabeblack@google.com 20812056Sgabeblack@google.com Process::initState(); 20912056Sgabeblack@google.com 21011263Sandreas.sandberg@arm.com 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 221AlphaISA::IntReg 222AlphaProcess::getSyscallArg(ThreadContext *tc, int &i) 223{ 224 assert(i < 6); 225 return tc->readIntReg(FirstArgumentReg + i++); 226} 227 228void 229AlphaProcess::setSyscallArg(ThreadContext *tc, int i, AlphaISA::IntReg val) 230{ 231 assert(i < 6); 232 tc->setIntReg(FirstArgumentReg + i, val); 233} 234 235void 236AlphaProcess::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} 251