process.cc revision 8601:af28085882dc
1/* 2 * Copyright (c) 2007 The Hewlett-Packard Development Company 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2003-2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Gabe Black 41 * Ali Saidi 42 */ 43 44#include "arch/x86/regs/misc.hh" 45#include "arch/x86/regs/segment.hh" 46#include "arch/x86/isa_traits.hh" 47#include "arch/x86/process.hh" 48#include "arch/x86/types.hh" 49#include "base/loader/elf_object.hh" 50#include "base/loader/object_file.hh" 51#include "base/misc.hh" 52#include "base/trace.hh" 53#include "cpu/thread_context.hh" 54#include "debug/Stack.hh" 55#include "mem/page_table.hh" 56#include "mem/translating_port.hh" 57#include "sim/process_impl.hh" 58#include "sim/syscall_emul.hh" 59#include "sim/system.hh" 60 61using namespace std; 62using namespace X86ISA; 63 64static const int ArgumentReg[] = { 65 INTREG_RDI, 66 INTREG_RSI, 67 INTREG_RDX, 68 //This argument register is r10 for syscalls and rcx for C. 69 INTREG_R10W, 70 //INTREG_RCX, 71 INTREG_R8W, 72 INTREG_R9W 73}; 74static const int NumArgumentRegs = sizeof(ArgumentReg) / sizeof(const int); 75static const int ArgumentReg32[] = { 76 INTREG_EBX, 77 INTREG_ECX, 78 INTREG_EDX, 79 INTREG_ESI, 80 INTREG_EDI, 81}; 82static const int NumArgumentRegs32 = sizeof(ArgumentReg) / sizeof(const int); 83 84X86LiveProcess::X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile, 85 SyscallDesc *_syscallDescs, int _numSyscallDescs) : 86 LiveProcess(params, objFile), syscallDescs(_syscallDescs), 87 numSyscallDescs(_numSyscallDescs) 88{ 89 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 90 brk_point = roundUp(brk_point, VMPageSize); 91} 92 93X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params, 94 ObjectFile *objFile, SyscallDesc *_syscallDescs, 95 int _numSyscallDescs) : 96 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 97{ 98 99 vsyscallPage.base = 0xffffffffff600000ULL; 100 vsyscallPage.size = VMPageSize; 101 vsyscallPage.vtimeOffset = 0x400; 102 vsyscallPage.vgettimeofdayOffset = 0x410; 103 104 // Set up stack. On X86_64 Linux, stack goes from the top of memory 105 // downward, less the hole for the kernel address space plus one page 106 // for undertermined purposes. 107 stack_base = (Addr)0x7FFFFFFFF000ULL; 108 109 // Set pointer for next thread stack. Reserve 8M for main stack. 110 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 111 112 // Set up region for mmaps. This was determined empirically and may not 113 // always be correct. 114 mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL; 115} 116 117void 118I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc) 119{ 120 TheISA::PCState pc = tc->pcState(); 121 Addr eip = pc.pc(); 122 if (eip >= vsyscallPage.base && 123 eip < vsyscallPage.base + vsyscallPage.size) { 124 pc.npc(vsyscallPage.base + vsyscallPage.vsysexitOffset); 125 tc->pcState(pc); 126 } 127 X86LiveProcess::syscall(callnum, tc); 128} 129 130 131I386LiveProcess::I386LiveProcess(LiveProcessParams *params, 132 ObjectFile *objFile, SyscallDesc *_syscallDescs, 133 int _numSyscallDescs) : 134 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 135{ 136 _gdtStart = ULL(0x100000000); 137 _gdtSize = VMPageSize; 138 139 vsyscallPage.base = 0xffffe000ULL; 140 vsyscallPage.size = VMPageSize; 141 vsyscallPage.vsyscallOffset = 0x400; 142 vsyscallPage.vsysexitOffset = 0x410; 143 144 stack_base = vsyscallPage.base; 145 146 // Set pointer for next thread stack. Reserve 8M for main stack. 147 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 148 149 // Set up region for mmaps. This was determined empirically and may not 150 // always be correct. 151 mmap_start = mmap_end = (Addr)0xf7ffe000ULL; 152} 153 154SyscallDesc* 155X86LiveProcess::getDesc(int callnum) 156{ 157 if (callnum < 0 || callnum >= numSyscallDescs) 158 return NULL; 159 return &syscallDescs[callnum]; 160} 161 162void 163X86_64LiveProcess::initState() 164{ 165 X86LiveProcess::initState(); 166 167 argsInit(sizeof(uint64_t), VMPageSize); 168 169 // Set up the vsyscall page for this process. 170 allocateMem(vsyscallPage.base, vsyscallPage.size); 171 uint8_t vtimeBlob[] = { 172 0x48,0xc7,0xc0,0xc9,0x00,0x00,0x00, // mov $0xc9,%rax 173 0x0f,0x05, // syscall 174 0xc3 // retq 175 }; 176 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vtimeOffset, 177 vtimeBlob, sizeof(vtimeBlob)); 178 179 uint8_t vgettimeofdayBlob[] = { 180 0x48,0xc7,0xc0,0x60,0x00,0x00,0x00, // mov $0x60,%rax 181 0x0f,0x05, // syscall 182 0xc3 // retq 183 }; 184 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vgettimeofdayOffset, 185 vgettimeofdayBlob, sizeof(vgettimeofdayBlob)); 186 187 for (int i = 0; i < contextIds.size(); i++) { 188 ThreadContext * tc = system->getThreadContext(contextIds[i]); 189 190 SegAttr dataAttr = 0; 191 dataAttr.dpl = 3; 192 dataAttr.unusable = 0; 193 dataAttr.defaultSize = 1; 194 dataAttr.longMode = 1; 195 dataAttr.avl = 0; 196 dataAttr.granularity = 1; 197 dataAttr.present = 1; 198 dataAttr.type = 3; 199 dataAttr.writable = 1; 200 dataAttr.readable = 1; 201 dataAttr.expandDown = 0; 202 dataAttr.system = 1; 203 204 //Initialize the segment registers. 205 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 206 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 207 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 208 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 209 } 210 211 SegAttr csAttr = 0; 212 csAttr.dpl = 3; 213 csAttr.unusable = 0; 214 csAttr.defaultSize = 0; 215 csAttr.longMode = 1; 216 csAttr.avl = 0; 217 csAttr.granularity = 1; 218 csAttr.present = 1; 219 csAttr.type = 10; 220 csAttr.writable = 0; 221 csAttr.readable = 1; 222 csAttr.expandDown = 0; 223 csAttr.system = 1; 224 225 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 226 227 Efer efer = 0; 228 efer.sce = 1; // Enable system call extensions. 229 efer.lme = 1; // Enable long mode. 230 efer.lma = 1; // Activate long mode. 231 efer.nxe = 1; // Enable nx support. 232 efer.svme = 0; // Disable svm support for now. It isn't implemented. 233 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 234 tc->setMiscReg(MISCREG_EFER, efer); 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 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 254 } 255} 256 257void 258I386LiveProcess::initState() 259{ 260 X86LiveProcess::initState(); 261 262 argsInit(sizeof(uint32_t), VMPageSize); 263 264 /* 265 * Set up a GDT for this process. The whole GDT wouldn't really be for 266 * this process, but the only parts we care about are. 267 */ 268 allocateMem(_gdtStart, _gdtSize); 269 uint64_t zero = 0; 270 assert(_gdtSize % sizeof(zero) == 0); 271 for (Addr gdtCurrent = _gdtStart; 272 gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) { 273 initVirtMem->write(gdtCurrent, zero); 274 } 275 276 // Set up the vsyscall page for this process. 277 allocateMem(vsyscallPage.base, vsyscallPage.size); 278 uint8_t vsyscallBlob[] = { 279 0x51, // push %ecx 280 0x52, // push %edp 281 0x55, // push %ebp 282 0x89, 0xe5, // mov %esp, %ebp 283 0x0f, 0x34 // sysenter 284 }; 285 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset, 286 vsyscallBlob, sizeof(vsyscallBlob)); 287 288 uint8_t vsysexitBlob[] = { 289 0x5d, // pop %ebp 290 0x5a, // pop %edx 291 0x59, // pop %ecx 292 0xc3 // ret 293 }; 294 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset, 295 vsysexitBlob, sizeof(vsysexitBlob)); 296 297 for (int i = 0; i < contextIds.size(); i++) { 298 ThreadContext * tc = system->getThreadContext(contextIds[i]); 299 300 SegAttr dataAttr = 0; 301 dataAttr.dpl = 3; 302 dataAttr.unusable = 0; 303 dataAttr.defaultSize = 1; 304 dataAttr.longMode = 0; 305 dataAttr.avl = 0; 306 dataAttr.granularity = 1; 307 dataAttr.present = 1; 308 dataAttr.type = 3; 309 dataAttr.writable = 1; 310 dataAttr.readable = 1; 311 dataAttr.expandDown = 0; 312 dataAttr.system = 1; 313 314 //Initialize the segment registers. 315 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 316 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 317 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 318 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 319 tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB); 320 tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1)); 321 } 322 323 SegAttr csAttr = 0; 324 csAttr.dpl = 3; 325 csAttr.unusable = 0; 326 csAttr.defaultSize = 1; 327 csAttr.longMode = 0; 328 csAttr.avl = 0; 329 csAttr.granularity = 1; 330 csAttr.present = 1; 331 csAttr.type = 0xa; 332 csAttr.writable = 0; 333 csAttr.readable = 1; 334 csAttr.expandDown = 0; 335 csAttr.system = 1; 336 337 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 338 339 tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart); 340 tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart); 341 tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1); 342 343 // Set the LDT selector to 0 to deactivate it. 344 tc->setMiscRegNoEffect(MISCREG_TSL, 0); 345 346 Efer efer = 0; 347 efer.sce = 1; // Enable system call extensions. 348 efer.lme = 1; // Enable long mode. 349 efer.lma = 0; // Deactivate long mode. 350 efer.nxe = 1; // Enable nx support. 351 efer.svme = 0; // Disable svm support for now. It isn't implemented. 352 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 353 tc->setMiscReg(MISCREG_EFER, efer); 354 355 //Set up the registers that describe the operating mode. 356 CR0 cr0 = 0; 357 cr0.pg = 1; // Turn on paging. 358 cr0.cd = 0; // Don't disable caching. 359 cr0.nw = 0; // This is bit is defined to be ignored. 360 cr0.am = 0; // No alignment checking 361 cr0.wp = 0; // Supervisor mode can write read only pages 362 cr0.ne = 1; 363 cr0.et = 1; // This should always be 1 364 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 365 // would be pointless. 366 cr0.em = 0; // Allow x87 instructions to execute natively. 367 cr0.mp = 1; // This doesn't really matter, but the manual suggests 368 // setting it to one. 369 cr0.pe = 1; // We're definitely in protected mode. 370 tc->setMiscReg(MISCREG_CR0, cr0); 371 372 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 373 } 374} 375 376template<class IntType> 377void 378X86LiveProcess::argsInit(int pageSize, 379 std::vector<AuxVector<IntType> > extraAuxvs) 380{ 381 int intSize = sizeof(IntType); 382 383 typedef AuxVector<IntType> auxv_t; 384 std::vector<auxv_t> auxv = extraAuxvs; 385 386 string filename; 387 if(argv.size() < 1) 388 filename = ""; 389 else 390 filename = argv[0]; 391 392 //We want 16 byte alignment 393 uint64_t align = 16; 394 395 // load object file into target memory 396 objFile->loadSections(initVirtMem); 397 398 enum X86CpuFeature { 399 X86_OnboardFPU = 1 << 0, 400 X86_VirtualModeExtensions = 1 << 1, 401 X86_DebuggingExtensions = 1 << 2, 402 X86_PageSizeExtensions = 1 << 3, 403 404 X86_TimeStampCounter = 1 << 4, 405 X86_ModelSpecificRegisters = 1 << 5, 406 X86_PhysicalAddressExtensions = 1 << 6, 407 X86_MachineCheckExtensions = 1 << 7, 408 409 X86_CMPXCHG8Instruction = 1 << 8, 410 X86_OnboardAPIC = 1 << 9, 411 X86_SYSENTER_SYSEXIT = 1 << 11, 412 413 X86_MemoryTypeRangeRegisters = 1 << 12, 414 X86_PageGlobalEnable = 1 << 13, 415 X86_MachineCheckArchitecture = 1 << 14, 416 X86_CMOVInstruction = 1 << 15, 417 418 X86_PageAttributeTable = 1 << 16, 419 X86_36BitPSEs = 1 << 17, 420 X86_ProcessorSerialNumber = 1 << 18, 421 X86_CLFLUSHInstruction = 1 << 19, 422 423 X86_DebugTraceStore = 1 << 21, 424 X86_ACPIViaMSR = 1 << 22, 425 X86_MultimediaExtensions = 1 << 23, 426 427 X86_FXSAVE_FXRSTOR = 1 << 24, 428 X86_StreamingSIMDExtensions = 1 << 25, 429 X86_StreamingSIMDExtensions2 = 1 << 26, 430 X86_CPUSelfSnoop = 1 << 27, 431 432 X86_HyperThreading = 1 << 28, 433 X86_AutomaticClockControl = 1 << 29, 434 X86_IA64Processor = 1 << 30 435 }; 436 437 //Setup the auxilliary vectors. These will already have endian conversion. 438 //Auxilliary vectors are loaded only for elf formatted executables. 439 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 440 if(elfObject) 441 { 442 uint64_t features = 443 X86_OnboardFPU | 444 X86_VirtualModeExtensions | 445 X86_DebuggingExtensions | 446 X86_PageSizeExtensions | 447 X86_TimeStampCounter | 448 X86_ModelSpecificRegisters | 449 X86_PhysicalAddressExtensions | 450 X86_MachineCheckExtensions | 451 X86_CMPXCHG8Instruction | 452 X86_OnboardAPIC | 453 X86_SYSENTER_SYSEXIT | 454 X86_MemoryTypeRangeRegisters | 455 X86_PageGlobalEnable | 456 X86_MachineCheckArchitecture | 457 X86_CMOVInstruction | 458 X86_PageAttributeTable | 459 X86_36BitPSEs | 460// X86_ProcessorSerialNumber | 461 X86_CLFLUSHInstruction | 462// X86_DebugTraceStore | 463// X86_ACPIViaMSR | 464 X86_MultimediaExtensions | 465 X86_FXSAVE_FXRSTOR | 466 X86_StreamingSIMDExtensions | 467 X86_StreamingSIMDExtensions2 | 468// X86_CPUSelfSnoop | 469// X86_HyperThreading | 470// X86_AutomaticClockControl | 471// X86_IA64Processor | 472 0; 473 474 //Bits which describe the system hardware capabilities 475 //XXX Figure out what these should be 476 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 477 //The system page size 478 auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize)); 479 //Frequency at which times() increments 480 //Defined to be 100 in the kernel source. 481 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 482 // For statically linked executables, this is the virtual address of the 483 // program header tables if they appear in the executable image 484 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 485 // This is the size of a program header entry from the elf file. 486 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 487 // This is the number of program headers from the original elf file. 488 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 489 //This is the address of the elf "interpreter", It should be set 490 //to 0 for regular executables. It should be something else 491 //(not sure what) for dynamic libraries. 492 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 493 494 //XXX Figure out what this should be. 495 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 496 //The entry point to the program 497 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 498 //Different user and group IDs 499 auxv.push_back(auxv_t(M5_AT_UID, uid())); 500 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 501 auxv.push_back(auxv_t(M5_AT_GID, gid())); 502 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 503 //Whether to enable "secure mode" in the executable 504 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 505 //The address of 16 "random" bytes. 506 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 507 //The name of the program 508 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 509 //The platform string 510 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 511 } 512 513 //Figure out how big the initial stack needs to be 514 515 // A sentry NULL void pointer at the top of the stack. 516 int sentry_size = intSize; 517 518 //This is the name of the file which is present on the initial stack 519 //It's purpose is to let the user space linker examine the original file. 520 int file_name_size = filename.size() + 1; 521 522 const int numRandomBytes = 16; 523 int aux_data_size = numRandomBytes; 524 525 string platform = "x86_64"; 526 aux_data_size += platform.size() + 1; 527 528 int env_data_size = 0; 529 for (int i = 0; i < envp.size(); ++i) { 530 env_data_size += envp[i].size() + 1; 531 } 532 int arg_data_size = 0; 533 for (int i = 0; i < argv.size(); ++i) { 534 arg_data_size += argv[i].size() + 1; 535 } 536 537 //The info_block needs to be padded so it's size is a multiple of the 538 //alignment mask. Also, it appears that there needs to be at least some 539 //padding, so if the size is already a multiple, we need to increase it 540 //anyway. 541 int base_info_block_size = 542 sentry_size + file_name_size + env_data_size + arg_data_size; 543 544 int info_block_size = roundUp(base_info_block_size, align); 545 546 int info_block_padding = info_block_size - base_info_block_size; 547 548 //Each auxilliary vector is two 8 byte words 549 int aux_array_size = intSize * 2 * (auxv.size() + 1); 550 551 int envp_array_size = intSize * (envp.size() + 1); 552 int argv_array_size = intSize * (argv.size() + 1); 553 554 int argc_size = intSize; 555 556 //Figure out the size of the contents of the actual initial frame 557 int frame_size = 558 aux_array_size + 559 envp_array_size + 560 argv_array_size + 561 argc_size; 562 563 //There needs to be padding after the auxiliary vector data so that the 564 //very bottom of the stack is aligned properly. 565 int partial_size = frame_size + aux_data_size; 566 int aligned_partial_size = roundUp(partial_size, align); 567 int aux_padding = aligned_partial_size - partial_size; 568 569 int space_needed = 570 info_block_size + 571 aux_data_size + 572 aux_padding + 573 frame_size; 574 575 stack_min = stack_base - space_needed; 576 stack_min = roundDown(stack_min, align); 577 stack_size = stack_base - stack_min; 578 579 // map memory 580 allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); 581 582 // map out initial stack contents 583 IntType sentry_base = stack_base - sentry_size; 584 IntType file_name_base = sentry_base - file_name_size; 585 IntType env_data_base = file_name_base - env_data_size; 586 IntType arg_data_base = env_data_base - arg_data_size; 587 IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size; 588 IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding; 589 IntType envp_array_base = auxv_array_base - envp_array_size; 590 IntType argv_array_base = envp_array_base - argv_array_size; 591 IntType argc_base = argv_array_base - argc_size; 592 593 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 594 DPRINTF(Stack, "0x%x - file name\n", file_name_base); 595 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 596 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 597 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 598 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 599 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 600 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 601 DPRINTF(Stack, "0x%x - argc \n", argc_base); 602 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 603 604 // write contents to stack 605 606 // figure out argc 607 IntType argc = argv.size(); 608 IntType guestArgc = X86ISA::htog(argc); 609 610 //Write out the sentry void * 611 IntType sentry_NULL = 0; 612 initVirtMem->writeBlob(sentry_base, 613 (uint8_t*)&sentry_NULL, sentry_size); 614 615 //Write the file name 616 initVirtMem->writeString(file_name_base, filename.c_str()); 617 618 //Fix up the aux vectors which point to data 619 assert(auxv[auxv.size() - 3].a_type == M5_AT_RANDOM); 620 auxv[auxv.size() - 3].a_val = aux_data_base; 621 assert(auxv[auxv.size() - 2].a_type == M5_AT_EXECFN); 622 auxv[auxv.size() - 2].a_val = argv_array_base; 623 assert(auxv[auxv.size() - 1].a_type == M5_AT_PLATFORM); 624 auxv[auxv.size() - 1].a_val = aux_data_base + numRandomBytes; 625 626 //Copy the aux stuff 627 for(int x = 0; x < auxv.size(); x++) 628 { 629 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 630 (uint8_t*)&(auxv[x].a_type), intSize); 631 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 632 (uint8_t*)&(auxv[x].a_val), intSize); 633 } 634 //Write out the terminating zeroed auxilliary vector 635 const uint64_t zero = 0; 636 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 637 (uint8_t*)&zero, 2 * intSize); 638 639 initVirtMem->writeString(aux_data_base, platform.c_str()); 640 641 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 642 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 643 644 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 645 646 ThreadContext *tc = system->getThreadContext(contextIds[0]); 647 //Set the stack pointer register 648 tc->setIntReg(StackPointerReg, stack_min); 649 650 // There doesn't need to be any segment base added in since we're dealing 651 // with the flat segmentation model. 652 tc->pcState(objFile->entryPoint()); 653 654 //Align the "stack_min" to a page boundary. 655 stack_min = roundDown(stack_min, pageSize); 656 657// num_processes++; 658} 659 660void 661X86_64LiveProcess::argsInit(int intSize, int pageSize) 662{ 663 std::vector<AuxVector<uint64_t> > extraAuxvs; 664 extraAuxvs.push_back(AuxVector<uint64_t>(M5_AT_SYSINFO_EHDR, 665 vsyscallPage.base)); 666 X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs); 667} 668 669void 670I386LiveProcess::argsInit(int intSize, int pageSize) 671{ 672 std::vector<AuxVector<uint32_t> > extraAuxvs; 673 //Tell the binary where the vsyscall part of the vsyscall page is. 674 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO, 675 vsyscallPage.base + vsyscallPage.vsyscallOffset)); 676 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO_EHDR, 677 vsyscallPage.base)); 678 X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs); 679} 680 681void 682X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value) 683{ 684 tc->setIntReg(INTREG_RAX, return_value.value()); 685} 686 687X86ISA::IntReg 688X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 689{ 690 assert(i < NumArgumentRegs); 691 return tc->readIntReg(ArgumentReg[i++]); 692} 693 694void 695X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 696{ 697 assert(i < NumArgumentRegs); 698 return tc->setIntReg(ArgumentReg[i], val); 699} 700 701X86ISA::IntReg 702I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 703{ 704 assert(i < NumArgumentRegs32); 705 return tc->readIntReg(ArgumentReg32[i++]); 706} 707 708X86ISA::IntReg 709I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width) 710{ 711 assert(width == 32 || width == 64); 712 assert(i < NumArgumentRegs); 713 uint64_t retVal = tc->readIntReg(ArgumentReg32[i++]) & mask(32); 714 if (width == 64) 715 retVal |= ((uint64_t)tc->readIntReg(ArgumentReg[i++]) << 32); 716 return retVal; 717} 718 719void 720I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 721{ 722 assert(i < NumArgumentRegs); 723 return tc->setIntReg(ArgumentReg[i], val); 724} 725