process.cc revision 4820
1/* 2 * Copyright (c) 2003-2006 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/* 33 * Copyright (c) 2007 The Hewlett-Packard Development Company 34 * All rights reserved. 35 * 36 * Redistribution and use of this software in source and binary forms, 37 * with or without modification, are permitted provided that the 38 * following conditions are met: 39 * 40 * The software must be used only for Non-Commercial Use which means any 41 * use which is NOT directed to receiving any direct monetary 42 * compensation for, or commercial advantage from such use. Illustrative 43 * examples of non-commercial use are academic research, personal study, 44 * teaching, education and corporate research & development. 45 * Illustrative examples of commercial use are distributing products for 46 * commercial advantage and providing services using the software for 47 * commercial advantage. 48 * 49 * If you wish to use this software or functionality therein that may be 50 * covered by patents for commercial use, please contact: 51 * Director of Intellectual Property Licensing 52 * Office of Strategy and Technology 53 * Hewlett-Packard Company 54 * 1501 Page Mill Road 55 * Palo Alto, California 94304 56 * 57 * Redistributions of source code must retain the above copyright notice, 58 * this list of conditions and the following disclaimer. Redistributions 59 * in binary form must reproduce the above copyright notice, this list of 60 * conditions and the following disclaimer in the documentation and/or 61 * other materials provided with the distribution. Neither the name of 62 * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its 63 * contributors may be used to endorse or promote products derived from 64 * this software without specific prior written permission. No right of 65 * sublicense is granted herewith. Derivatives of the software and 66 * output created using the software may be prepared, but only for 67 * Non-Commercial Uses. Derivatives of the software may be shared with 68 * others provided: (i) the others agree to abide by the list of 69 * conditions herein which includes the Non-Commercial Use restrictions; 70 * and (ii) such Derivatives of the software include the above copyright 71 * notice to acknowledge the contribution from this software where 72 * applicable, this list of conditions and the disclaimer below. 73 * 74 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 75 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 76 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 77 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 78 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 79 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 80 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 81 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 82 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 83 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 84 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 85 * 86 * Authors: Gabe Black 87 */ 88 89#include "arch/x86/isa_traits.hh" 90#include "arch/x86/process.hh" 91#include "arch/x86/types.hh" 92#include "base/loader/object_file.hh" 93#include "base/loader/elf_object.hh" 94#include "base/misc.hh" 95#include "cpu/thread_context.hh" 96#include "mem/page_table.hh" 97#include "mem/translating_port.hh" 98#include "sim/process_impl.hh" 99#include "sim/system.hh" 100 101using namespace std; 102using namespace X86ISA; 103 104M5_64_auxv_t::M5_64_auxv_t(int64_t type, int64_t val) 105{ 106 a_type = TheISA::htog(type); 107 a_val = TheISA::htog(val); 108} 109 110X86LiveProcess::X86LiveProcess(const std::string &nm, ObjectFile *objFile, 111 System *_system, int stdin_fd, int stdout_fd, int stderr_fd, 112 std::vector<std::string> &argv, std::vector<std::string> &envp, 113 const std::string &cwd, 114 uint64_t _uid, uint64_t _euid, uint64_t _gid, uint64_t _egid, 115 uint64_t _pid, uint64_t _ppid) 116 : LiveProcess(nm, objFile, _system, stdin_fd, stdout_fd, stderr_fd, 117 argv, envp, cwd, _uid, _euid, _gid, _egid, _pid, _ppid) 118{ 119 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 120 brk_point = roundUp(brk_point, VMPageSize); 121 122 // Set pointer for next thread stack. Reserve 8M for main stack. 123 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 124 125 // Set up stack. On X86_64 Linux, stack goes from the top of memory 126 // downward, less the hole for the kernel address space plus one page 127 // for undertermined purposes. 128 stack_base = (Addr)0x7FFFFFFFF000ULL; 129 130 // Set up region for mmaps. This was determined empirically and may not 131 // always be correct. 132 mmap_start = mmap_end = 0x2aaaaaaab000; 133} 134 135void X86LiveProcess::handleTrap(int trapNum, ThreadContext *tc) 136{ 137 switch(trapNum) 138 { 139 default: 140 panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum); 141 } 142} 143 144void 145X86LiveProcess::startup() 146{ 147 argsInit(sizeof(IntReg), VMPageSize); 148 149 //The AMD64 abi says that only rsp and rdx are defined at process 150 //startup. rsp will be set by argsInit, and I don't understand what 151 //rdx should be set to. The other floating point and integer registers 152 //will be zeroed by the register file constructors, but control registers 153 //should be initialized here. Since none of those are implemented, there 154 //isn't anything here. 155} 156 157void 158X86LiveProcess::argsInit(int intSize, int pageSize) 159{ 160 typedef M5_64_auxv_t auxv_t; 161 Process::startup(); 162 163 string filename; 164 if(argv.size() < 1) 165 filename = ""; 166 else 167 filename = argv[0]; 168 169 //We want 16 byte alignment 170 Addr alignmentMask = ~mask(4); 171 172 // load object file into target memory 173 objFile->loadSections(initVirtMem); 174 175 enum X86CpuFeature { 176 X86_OnboardFPU = 1 << 0, 177 X86_VirtualModeExtensions = 1 << 1, 178 X86_DebuggingExtensions = 1 << 2, 179 X86_PageSizeExtensions = 1 << 3, 180 181 X86_TimeStampCounter = 1 << 4, 182 X86_ModelSpecificRegisters = 1 << 5, 183 X86_PhysicalAddressExtensions = 1 << 6, 184 X86_MachineCheckExtensions = 1 << 7, 185 186 X86_CMPXCHG8Instruction = 1 << 8, 187 X86_OnboardAPIC = 1 << 9, 188 X86_SYSENTER_SYSEXIT = 1 << 11, 189 190 X86_MemoryTypeRangeRegisters = 1 << 12, 191 X86_PageGlobalEnable = 1 << 13, 192 X86_MachineCheckArchitecture = 1 << 14, 193 X86_CMOVInstruction = 1 << 15, 194 195 X86_PageAttributeTable = 1 << 16, 196 X86_36BitPSEs = 1 << 17, 197 X86_ProcessorSerialNumber = 1 << 18, 198 X86_CLFLUSHInstruction = 1 << 19, 199 200 X86_DebugTraceStore = 1 << 21, 201 X86_ACPIViaMSR = 1 << 22, 202 X86_MultimediaExtensions = 1 << 23, 203 204 X86_FXSAVE_FXRSTOR = 1 << 24, 205 X86_StreamingSIMDExtensions = 1 << 25, 206 X86_StreamingSIMDExtensions2 = 1 << 26, 207 X86_CPUSelfSnoop = 1 << 27, 208 209 X86_HyperThreading = 1 << 28, 210 X86_AutomaticClockControl = 1 << 29, 211 X86_IA64Processor = 1 << 30 212 }; 213 214 //Setup the auxilliary vectors. These will already have endian conversion. 215 //Auxilliary vectors are loaded only for elf formatted executables. 216 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 217 if(elfObject) 218 { 219 uint64_t features = 220 X86_OnboardFPU | 221 X86_VirtualModeExtensions | 222 X86_DebuggingExtensions | 223 X86_PageSizeExtensions | 224 X86_TimeStampCounter | 225 X86_ModelSpecificRegisters | 226 X86_PhysicalAddressExtensions | 227 X86_MachineCheckExtensions | 228 X86_CMPXCHG8Instruction | 229 X86_OnboardAPIC | 230 X86_SYSENTER_SYSEXIT | 231 X86_MemoryTypeRangeRegisters | 232 X86_PageGlobalEnable | 233 X86_MachineCheckArchitecture | 234 X86_CMOVInstruction | 235 X86_PageAttributeTable | 236 X86_36BitPSEs | 237// X86_ProcessorSerialNumber | 238 X86_CLFLUSHInstruction | 239// X86_DebugTraceStore | 240// X86_ACPIViaMSR | 241 X86_MultimediaExtensions | 242 X86_FXSAVE_FXRSTOR | 243 X86_StreamingSIMDExtensions | 244 X86_StreamingSIMDExtensions2 | 245// X86_CPUSelfSnoop | 246// X86_HyperThreading | 247// X86_AutomaticClockControl | 248// X86_IA64Processor | 249 0; 250 251 //Bits which describe the system hardware capabilities 252 //XXX Figure out what these should be 253 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 254 //The system page size 255 auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize)); 256 //Frequency at which times() increments 257 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 258 // For statically linked executables, this is the virtual address of the 259 // program header tables if they appear in the executable image 260 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 261 // This is the size of a program header entry from the elf file. 262 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 263 // This is the number of program headers from the original elf file. 264 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 265 //Defined to be 100 in the kernel source. 266 //This is the address of the elf "interpreter", It should be set 267 //to 0 for regular executables. It should be something else 268 //(not sure what) for dynamic libraries. 269 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 270 271 //XXX Figure out what this should be. 272 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 273 //The entry point to the program 274 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 275 //Different user and group IDs 276 auxv.push_back(auxv_t(M5_AT_UID, uid())); 277 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 278 auxv.push_back(auxv_t(M5_AT_GID, gid())); 279 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 280 //Whether to enable "secure mode" in the executable 281 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 282 //The string "x86_64" with unknown meaning 283 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 284 } 285 286 //Figure out how big the initial stack needs to be 287 288 // The unaccounted for 0 at the top of the stack 289 int mysterious_size = intSize; 290 291 //This is the name of the file which is present on the initial stack 292 //It's purpose is to let the user space linker examine the original file. 293 int file_name_size = filename.size(); 294 295 string platform = "x86_64"; 296 int aux_data_size = platform.size() + 1; 297 298 int env_data_size = 0; 299 for (int i = 0; i < envp.size(); ++i) { 300 env_data_size += envp[i].size(); 301 } 302 int arg_data_size = 0; 303 for (int i = 0; i < argv.size(); ++i) { 304 arg_data_size += argv[i].size(); 305 } 306 307 //The auxiliary vector data needs to be padded so it's size is a multiple 308 //of the alignment mask. 309 int aux_padding = 310 ((aux_data_size + ~alignmentMask) & alignmentMask) - aux_data_size; 311 312 //The info_block needs to be padded so it's size is a multiple of the 313 //alignment mask. Also, it appears that there needs to be at least some 314 //padding, so if the size is already a multiple, we need to increase it 315 //anyway. 316 int info_block_size = 317 (mysterious_size + 318 file_name_size + 319 env_data_size + 320 arg_data_size + 321 ~alignmentMask) & alignmentMask; 322 323 int info_block_padding = 324 info_block_size - 325 mysterious_size - 326 file_name_size - 327 env_data_size - 328 arg_data_size; 329 330 //Each auxilliary vector is two 8 byte words 331 int aux_array_size = intSize * 2 * (auxv.size() + 1); 332 333 int envp_array_size = intSize * (envp.size() + 1); 334 int argv_array_size = intSize * (argv.size() + 1); 335 336 int argc_size = intSize; 337 338 int space_needed = 339 info_block_size + 340 aux_data_size + 341 aux_padding + 342 aux_array_size + 343 envp_array_size + 344 argv_array_size + 345 argc_size; 346 347 stack_min = stack_base - space_needed; 348 stack_min &= alignmentMask; 349 stack_size = stack_base - stack_min; 350 351 // map memory 352 pTable->allocate(roundDown(stack_min, pageSize), 353 roundUp(stack_size, pageSize)); 354 355 // map out initial stack contents 356 Addr mysterious_base = stack_base - mysterious_size; 357 Addr file_name_base = mysterious_base - file_name_size; 358 Addr env_data_base = file_name_base - env_data_size; 359 Addr arg_data_base = env_data_base - arg_data_size; 360 Addr aux_data_base = arg_data_base - aux_data_size - info_block_padding; 361 Addr auxv_array_base = aux_data_base - aux_array_size - aux_padding; 362 Addr envp_array_base = auxv_array_base - envp_array_size; 363 Addr argv_array_base = envp_array_base - argv_array_size; 364 Addr argc_base = argv_array_base - argc_size; 365 366 DPRINTF(X86, "The addresses of items on the initial stack:\n"); 367 DPRINTF(X86, "0x%x - file name\n", file_name_base); 368 DPRINTF(X86, "0x%x - env data\n", env_data_base); 369 DPRINTF(X86, "0x%x - arg data\n", arg_data_base); 370 DPRINTF(X86, "0x%x - aux data\n", aux_data_base); 371 DPRINTF(X86, "0x%x - auxv array\n", auxv_array_base); 372 DPRINTF(X86, "0x%x - envp array\n", envp_array_base); 373 DPRINTF(X86, "0x%x - argv array\n", argv_array_base); 374 DPRINTF(X86, "0x%x - argc \n", argc_base); 375 DPRINTF(X86, "0x%x - stack min\n", stack_min); 376 377 // write contents to stack 378 379 // figure out argc 380 uint64_t argc = argv.size(); 381 uint64_t guestArgc = TheISA::htog(argc); 382 383 //Write out the mysterious 0 384 uint64_t mysterious_zero = 0; 385 initVirtMem->writeBlob(mysterious_base, 386 (uint8_t*)&mysterious_zero, mysterious_size); 387 388 //Write the file name 389 initVirtMem->writeString(file_name_base, filename.c_str()); 390 391 //Fix up the aux vector which points to the "platform" string 392 assert(auxv[auxv.size() - 1].a_type = M5_AT_PLATFORM); 393 auxv[auxv.size() - 1].a_val = aux_data_base; 394 395 //Copy the aux stuff 396 for(int x = 0; x < auxv.size(); x++) 397 { 398 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 399 (uint8_t*)&(auxv[x].a_type), intSize); 400 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 401 (uint8_t*)&(auxv[x].a_val), intSize); 402 } 403 //Write out the terminating zeroed auxilliary vector 404 const uint64_t zero = 0; 405 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 406 (uint8_t*)&zero, 2 * intSize); 407 408 initVirtMem->writeString(aux_data_base, platform.c_str()); 409 410 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 411 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 412 413 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 414 415 //Set up the thread context to start running the process 416 //Because of the peculiarities of how syscall works, I believe 417 //a process starts with r11 containing the value of eflags or maybe r11 418 //from before the call to execve. Empirically this value is 0x200. 419 threadContexts[0]->setIntReg(INTREG_R11, 0x200); 420 //Set the stack pointer register 421 threadContexts[0]->setIntReg(StackPointerReg, stack_min); 422 423 Addr prog_entry = objFile->entryPoint(); 424 threadContexts[0]->setPC(prog_entry); 425 threadContexts[0]->setNextPC(prog_entry + sizeof(MachInst)); 426 427 //Align the "stack_min" to a page boundary. 428 stack_min = roundDown(stack_min, pageSize); 429 430// num_processes++; 431} 432