process.cc revision 5973:07444c3d0a07
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/segmentregs.hh" 92#include "arch/x86/types.hh" 93#include "base/loader/object_file.hh" 94#include "base/loader/elf_object.hh" 95#include "base/misc.hh" 96#include "base/trace.hh" 97#include "cpu/thread_context.hh" 98#include "mem/page_table.hh" 99#include "mem/translating_port.hh" 100#include "sim/process_impl.hh" 101#include "sim/syscall_emul.hh" 102#include "sim/system.hh" 103 104using namespace std; 105using namespace X86ISA; 106 107static const int ReturnValueReg = INTREG_RAX; 108static const int ArgumentReg[] = { 109 INTREG_RDI, 110 INTREG_RSI, 111 INTREG_RDX, 112 //This argument register is r10 for syscalls and rcx for C. 113 INTREG_R10W, 114 //INTREG_RCX, 115 INTREG_R8W, 116 INTREG_R9W 117}; 118static const int NumArgumentRegs = sizeof(ArgumentReg) / sizeof(const int); 119static const int ArgumentReg32[] = { 120 INTREG_EBX, 121 INTREG_ECX, 122 INTREG_EDX, 123 INTREG_ESI, 124 INTREG_EDI, 125}; 126static const int NumArgumentRegs32 = sizeof(ArgumentReg) / sizeof(const int); 127 128X86LiveProcess::X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile, 129 SyscallDesc *_syscallDescs, int _numSyscallDescs) : 130 LiveProcess(params, objFile), syscallDescs(_syscallDescs), 131 numSyscallDescs(_numSyscallDescs) 132{ 133 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 134 brk_point = roundUp(brk_point, VMPageSize); 135} 136 137X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params, 138 ObjectFile *objFile, SyscallDesc *_syscallDescs, 139 int _numSyscallDescs) : 140 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 141{ 142 // Set up stack. On X86_64 Linux, stack goes from the top of memory 143 // downward, less the hole for the kernel address space plus one page 144 // for undertermined purposes. 145 stack_base = (Addr)0x7FFFFFFFF000ULL; 146 147 // Set pointer for next thread stack. Reserve 8M for main stack. 148 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 149 150 // Set up region for mmaps. This was determined empirically and may not 151 // always be correct. 152 mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL; 153} 154 155void 156I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc) 157{ 158 Addr eip = tc->readPC(); 159 if (eip >= vsyscallPage.base && 160 eip < vsyscallPage.base + vsyscallPage.size) { 161 tc->setNextPC(vsyscallPage.base + vsyscallPage.vsysexitOffset); 162 } 163 X86LiveProcess::syscall(callnum, tc); 164} 165 166 167I386LiveProcess::I386LiveProcess(LiveProcessParams *params, 168 ObjectFile *objFile, SyscallDesc *_syscallDescs, 169 int _numSyscallDescs) : 170 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 171{ 172 _gdtStart = 0x100000000; 173 _gdtSize = VMPageSize; 174 175 vsyscallPage.base = 0xffffe000ULL; 176 vsyscallPage.size = VMPageSize; 177 vsyscallPage.vsyscallOffset = 0x400; 178 vsyscallPage.vsysexitOffset = 0x410; 179 180 stack_base = vsyscallPage.base; 181 182 // Set pointer for next thread stack. Reserve 8M for main stack. 183 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 184 185 // Set up region for mmaps. This was determined empirically and may not 186 // always be correct. 187 mmap_start = mmap_end = (Addr)0xf7ffd000ULL; 188} 189 190SyscallDesc* 191X86LiveProcess::getDesc(int callnum) 192{ 193 if (callnum < 0 || callnum >= numSyscallDescs) 194 return NULL; 195 return &syscallDescs[callnum]; 196} 197 198void 199X86_64LiveProcess::startup() 200{ 201 LiveProcess::startup(); 202 203 if (checkpointRestored) 204 return; 205 206 argsInit(sizeof(uint64_t), VMPageSize); 207 208 for (int i = 0; i < contextIds.size(); i++) { 209 ThreadContext * tc = system->getThreadContext(contextIds[i]); 210 211 SegAttr dataAttr = 0; 212 dataAttr.writable = 1; 213 dataAttr.readable = 1; 214 dataAttr.expandDown = 0; 215 dataAttr.dpl = 3; 216 dataAttr.defaultSize = 0; 217 dataAttr.longMode = 1; 218 219 //Initialize the segment registers. 220 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 221 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 222 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 223 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 224 } 225 226 SegAttr csAttr = 0; 227 csAttr.writable = 0; 228 csAttr.readable = 1; 229 csAttr.expandDown = 0; 230 csAttr.dpl = 3; 231 csAttr.defaultSize = 0; 232 csAttr.longMode = 1; 233 234 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 235 236 //Set up the registers that describe the operating mode. 237 CR0 cr0 = 0; 238 cr0.pg = 1; // Turn on paging. 239 cr0.cd = 0; // Don't disable caching. 240 cr0.nw = 0; // This is bit is defined to be ignored. 241 cr0.am = 0; // No alignment checking 242 cr0.wp = 0; // Supervisor mode can write read only pages 243 cr0.ne = 1; 244 cr0.et = 1; // This should always be 1 245 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 246 // would be pointless. 247 cr0.em = 0; // Allow x87 instructions to execute natively. 248 cr0.mp = 1; // This doesn't really matter, but the manual suggests 249 // setting it to one. 250 cr0.pe = 1; // We're definitely in protected mode. 251 tc->setMiscReg(MISCREG_CR0, cr0); 252 253 Efer efer = 0; 254 efer.sce = 1; // Enable system call extensions. 255 efer.lme = 1; // Enable long mode. 256 efer.lma = 1; // Activate long mode. 257 efer.nxe = 1; // Enable nx support. 258 efer.svme = 0; // Disable svm support for now. It isn't implemented. 259 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 260 tc->setMiscReg(MISCREG_EFER, efer); 261 } 262} 263 264void 265I386LiveProcess::startup() 266{ 267 LiveProcess::startup(); 268 269 if (checkpointRestored) 270 return; 271 272 argsInit(sizeof(uint32_t), VMPageSize); 273 274 /* 275 * Set up a GDT for this process. The whole GDT wouldn't really be for 276 * this process, but the only parts we care about are. 277 */ 278 pTable->allocate(_gdtStart, _gdtSize); 279 uint64_t zero = 0; 280 assert(_gdtSize % sizeof(zero) == 0); 281 for (Addr gdtCurrent = _gdtStart; 282 gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) { 283 initVirtMem->write(gdtCurrent, zero); 284 } 285 286 // Set up the vsyscall page for this process. 287 pTable->allocate(vsyscallPage.base, vsyscallPage.size); 288 uint8_t vsyscallBlob[] = { 289 0x51, // push %ecx 290 0x52, // push %edp 291 0x55, // push %ebp 292 0x89, 0xe5, // mov %esp, %ebp 293 0x0f, 0x34 // sysenter 294 }; 295 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset, 296 vsyscallBlob, sizeof(vsyscallBlob)); 297 298 uint8_t vsysexitBlob[] = { 299 0x5d, // pop %ebp 300 0x5a, // pop %edx 301 0x59, // pop %ecx 302 0xc3 // ret 303 }; 304 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset, 305 vsysexitBlob, sizeof(vsysexitBlob)); 306 307 for (int i = 0; i < contextIds.size(); i++) { 308 ThreadContext * tc = system->getThreadContext(contextIds[i]); 309 310 SegAttr dataAttr = 0; 311 dataAttr.writable = 1; 312 dataAttr.readable = 1; 313 dataAttr.expandDown = 0; 314 dataAttr.dpl = 3; 315 dataAttr.defaultSize = 1; 316 dataAttr.longMode = 0; 317 318 //Initialize the segment registers. 319 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 320 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 321 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 322 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 323 tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB); 324 tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1)); 325 } 326 327 SegAttr csAttr = 0; 328 csAttr.writable = 0; 329 csAttr.readable = 1; 330 csAttr.expandDown = 0; 331 csAttr.dpl = 3; 332 csAttr.defaultSize = 1; 333 csAttr.longMode = 0; 334 335 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 336 337 tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart); 338 tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart); 339 tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1); 340 341 // Set the LDT selector to 0 to deactivate it. 342 tc->setMiscRegNoEffect(MISCREG_TSL, 0); 343 344 //Set up the registers that describe the operating mode. 345 CR0 cr0 = 0; 346 cr0.pg = 1; // Turn on paging. 347 cr0.cd = 0; // Don't disable caching. 348 cr0.nw = 0; // This is bit is defined to be ignored. 349 cr0.am = 0; // No alignment checking 350 cr0.wp = 0; // Supervisor mode can write read only pages 351 cr0.ne = 1; 352 cr0.et = 1; // This should always be 1 353 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 354 // would be pointless. 355 cr0.em = 0; // Allow x87 instructions to execute natively. 356 cr0.mp = 1; // This doesn't really matter, but the manual suggests 357 // setting it to one. 358 cr0.pe = 1; // We're definitely in protected mode. 359 tc->setMiscReg(MISCREG_CR0, cr0); 360 361 Efer efer = 0; 362 efer.sce = 1; // Enable system call extensions. 363 efer.lme = 1; // Enable long mode. 364 efer.lma = 0; // Deactivate long mode. 365 efer.nxe = 1; // Enable nx support. 366 efer.svme = 0; // Disable svm support for now. It isn't implemented. 367 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 368 tc->setMiscReg(MISCREG_EFER, efer); 369 } 370} 371 372template<class IntType> 373void 374X86LiveProcess::argsInit(int pageSize, 375 std::vector<AuxVector<IntType> > extraAuxvs) 376{ 377 int intSize = sizeof(IntType); 378 379 typedef AuxVector<IntType> auxv_t; 380 std::vector<auxv_t> auxv = extraAuxvs; 381 382 string filename; 383 if(argv.size() < 1) 384 filename = ""; 385 else 386 filename = argv[0]; 387 388 //We want 16 byte alignment 389 uint64_t align = 16; 390 391 // load object file into target memory 392 objFile->loadSections(initVirtMem); 393 394 enum X86CpuFeature { 395 X86_OnboardFPU = 1 << 0, 396 X86_VirtualModeExtensions = 1 << 1, 397 X86_DebuggingExtensions = 1 << 2, 398 X86_PageSizeExtensions = 1 << 3, 399 400 X86_TimeStampCounter = 1 << 4, 401 X86_ModelSpecificRegisters = 1 << 5, 402 X86_PhysicalAddressExtensions = 1 << 6, 403 X86_MachineCheckExtensions = 1 << 7, 404 405 X86_CMPXCHG8Instruction = 1 << 8, 406 X86_OnboardAPIC = 1 << 9, 407 X86_SYSENTER_SYSEXIT = 1 << 11, 408 409 X86_MemoryTypeRangeRegisters = 1 << 12, 410 X86_PageGlobalEnable = 1 << 13, 411 X86_MachineCheckArchitecture = 1 << 14, 412 X86_CMOVInstruction = 1 << 15, 413 414 X86_PageAttributeTable = 1 << 16, 415 X86_36BitPSEs = 1 << 17, 416 X86_ProcessorSerialNumber = 1 << 18, 417 X86_CLFLUSHInstruction = 1 << 19, 418 419 X86_DebugTraceStore = 1 << 21, 420 X86_ACPIViaMSR = 1 << 22, 421 X86_MultimediaExtensions = 1 << 23, 422 423 X86_FXSAVE_FXRSTOR = 1 << 24, 424 X86_StreamingSIMDExtensions = 1 << 25, 425 X86_StreamingSIMDExtensions2 = 1 << 26, 426 X86_CPUSelfSnoop = 1 << 27, 427 428 X86_HyperThreading = 1 << 28, 429 X86_AutomaticClockControl = 1 << 29, 430 X86_IA64Processor = 1 << 30 431 }; 432 433 //Setup the auxilliary vectors. These will already have endian conversion. 434 //Auxilliary vectors are loaded only for elf formatted executables. 435 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 436 if(elfObject) 437 { 438 uint64_t features = 439 X86_OnboardFPU | 440 X86_VirtualModeExtensions | 441 X86_DebuggingExtensions | 442 X86_PageSizeExtensions | 443 X86_TimeStampCounter | 444 X86_ModelSpecificRegisters | 445 X86_PhysicalAddressExtensions | 446 X86_MachineCheckExtensions | 447 X86_CMPXCHG8Instruction | 448 X86_OnboardAPIC | 449 X86_SYSENTER_SYSEXIT | 450 X86_MemoryTypeRangeRegisters | 451 X86_PageGlobalEnable | 452 X86_MachineCheckArchitecture | 453 X86_CMOVInstruction | 454 X86_PageAttributeTable | 455 X86_36BitPSEs | 456// X86_ProcessorSerialNumber | 457 X86_CLFLUSHInstruction | 458// X86_DebugTraceStore | 459// X86_ACPIViaMSR | 460 X86_MultimediaExtensions | 461 X86_FXSAVE_FXRSTOR | 462 X86_StreamingSIMDExtensions | 463 X86_StreamingSIMDExtensions2 | 464// X86_CPUSelfSnoop | 465// X86_HyperThreading | 466// X86_AutomaticClockControl | 467// X86_IA64Processor | 468 0; 469 470 //Bits which describe the system hardware capabilities 471 //XXX Figure out what these should be 472 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 473 //The system page size 474 auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize)); 475 //Frequency at which times() increments 476 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 477 // For statically linked executables, this is the virtual address of the 478 // program header tables if they appear in the executable image 479 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 480 // This is the size of a program header entry from the elf file. 481 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 482 // This is the number of program headers from the original elf file. 483 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 484 //Defined to be 100 in the kernel source. 485 //This is the address of the elf "interpreter", It should be set 486 //to 0 for regular executables. It should be something else 487 //(not sure what) for dynamic libraries. 488 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 489 490 //XXX Figure out what this should be. 491 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 492 //The entry point to the program 493 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 494 //Different user and group IDs 495 auxv.push_back(auxv_t(M5_AT_UID, uid())); 496 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 497 auxv.push_back(auxv_t(M5_AT_GID, gid())); 498 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 499 //Whether to enable "secure mode" in the executable 500 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 501 //The string "x86_64" with unknown meaning 502 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 503 } 504 505 //Figure out how big the initial stack needs to be 506 507 // A sentry NULL void pointer at the top of the stack. 508 int sentry_size = intSize; 509 510 //This is the name of the file which is present on the initial stack 511 //It's purpose is to let the user space linker examine the original file. 512 int file_name_size = filename.size() + 1; 513 514 string platform = "x86_64"; 515 int aux_data_size = platform.size() + 1; 516 517 int env_data_size = 0; 518 for (int i = 0; i < envp.size(); ++i) { 519 env_data_size += envp[i].size() + 1; 520 } 521 int arg_data_size = 0; 522 for (int i = 0; i < argv.size(); ++i) { 523 arg_data_size += argv[i].size() + 1; 524 } 525 526 //The info_block needs to be padded so it's size is a multiple of the 527 //alignment mask. Also, it appears that there needs to be at least some 528 //padding, so if the size is already a multiple, we need to increase it 529 //anyway. 530 int base_info_block_size = 531 sentry_size + file_name_size + env_data_size + arg_data_size; 532 533 int info_block_size = roundUp(base_info_block_size, align); 534 535 int info_block_padding = info_block_size - base_info_block_size; 536 537 //Each auxilliary vector is two 8 byte words 538 int aux_array_size = intSize * 2 * (auxv.size() + 1); 539 540 int envp_array_size = intSize * (envp.size() + 1); 541 int argv_array_size = intSize * (argv.size() + 1); 542 543 int argc_size = intSize; 544 545 //Figure out the size of the contents of the actual initial frame 546 int frame_size = 547 aux_array_size + 548 envp_array_size + 549 argv_array_size + 550 argc_size; 551 552 //There needs to be padding after the auxiliary vector data so that the 553 //very bottom of the stack is aligned properly. 554 int partial_size = frame_size + aux_data_size; 555 int aligned_partial_size = roundUp(partial_size, align); 556 int aux_padding = aligned_partial_size - partial_size; 557 558 int space_needed = 559 info_block_size + 560 aux_data_size + 561 aux_padding + 562 frame_size; 563 564 stack_min = stack_base - space_needed; 565 stack_min = roundDown(stack_min, align); 566 stack_size = stack_base - stack_min; 567 568 // map memory 569 pTable->allocate(roundDown(stack_min, pageSize), 570 roundUp(stack_size, pageSize)); 571 572 // map out initial stack contents 573 IntType sentry_base = stack_base - sentry_size; 574 IntType file_name_base = sentry_base - file_name_size; 575 IntType env_data_base = file_name_base - env_data_size; 576 IntType arg_data_base = env_data_base - arg_data_size; 577 IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size; 578 IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding; 579 IntType envp_array_base = auxv_array_base - envp_array_size; 580 IntType argv_array_base = envp_array_base - argv_array_size; 581 IntType argc_base = argv_array_base - argc_size; 582 583 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 584 DPRINTF(Stack, "0x%x - file name\n", file_name_base); 585 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 586 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 587 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 588 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 589 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 590 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 591 DPRINTF(Stack, "0x%x - argc \n", argc_base); 592 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 593 594 // write contents to stack 595 596 // figure out argc 597 IntType argc = argv.size(); 598 IntType guestArgc = X86ISA::htog(argc); 599 600 //Write out the sentry void * 601 IntType sentry_NULL = 0; 602 initVirtMem->writeBlob(sentry_base, 603 (uint8_t*)&sentry_NULL, sentry_size); 604 605 //Write the file name 606 initVirtMem->writeString(file_name_base, filename.c_str()); 607 608 //Fix up the aux vector which points to the "platform" string 609 assert(auxv[auxv.size() - 1].a_type = M5_AT_PLATFORM); 610 auxv[auxv.size() - 1].a_val = aux_data_base; 611 612 //Copy the aux stuff 613 for(int x = 0; x < auxv.size(); x++) 614 { 615 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 616 (uint8_t*)&(auxv[x].a_type), intSize); 617 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 618 (uint8_t*)&(auxv[x].a_val), intSize); 619 } 620 //Write out the terminating zeroed auxilliary vector 621 const uint64_t zero = 0; 622 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 623 (uint8_t*)&zero, 2 * intSize); 624 625 initVirtMem->writeString(aux_data_base, platform.c_str()); 626 627 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 628 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 629 630 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 631 632 ThreadContext *tc = system->getThreadContext(contextIds[0]); 633 //Set the stack pointer register 634 tc->setIntReg(StackPointerReg, stack_min); 635 636 Addr prog_entry = objFile->entryPoint(); 637 // There doesn't need to be any segment base added in since we're dealing 638 // with the flat segmentation model. 639 tc->setPC(prog_entry); 640 tc->setNextPC(prog_entry + sizeof(MachInst)); 641 642 //Align the "stack_min" to a page boundary. 643 stack_min = roundDown(stack_min, pageSize); 644 645// num_processes++; 646} 647 648void 649X86_64LiveProcess::argsInit(int intSize, int pageSize) 650{ 651 std::vector<AuxVector<uint64_t> > extraAuxvs; 652 X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs); 653} 654 655void 656I386LiveProcess::argsInit(int intSize, int pageSize) 657{ 658 std::vector<AuxVector<uint32_t> > extraAuxvs; 659 //Tell the binary where the vsyscall part of the vsyscall page is. 660 extraAuxvs.push_back(AuxVector<uint32_t>(0x20, 661 vsyscallPage.base + vsyscallPage.vsyscallOffset)); 662 extraAuxvs.push_back(AuxVector<uint32_t>(0x21, vsyscallPage.base)); 663 X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs); 664} 665 666void 667X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value) 668{ 669 tc->setIntReg(INTREG_RAX, return_value.value()); 670} 671 672X86ISA::IntReg 673X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int i) 674{ 675 assert(i < NumArgumentRegs); 676 return tc->readIntReg(ArgumentReg[i]); 677} 678 679void 680X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 681{ 682 assert(i < NumArgumentRegs); 683 return tc->setIntReg(ArgumentReg[i], val); 684} 685 686X86ISA::IntReg 687I386LiveProcess::getSyscallArg(ThreadContext *tc, int i) 688{ 689 assert(i < NumArgumentRegs32); 690 return tc->readIntReg(ArgumentReg32[i]); 691} 692 693void 694I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 695{ 696 assert(i < NumArgumentRegs); 697 return tc->setIntReg(ArgumentReg[i], val); 698} 699