process.cc revision 7087:fb8d5786ff30
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/isa_traits.hh" 45#include "arch/x86/miscregs.hh" 46#include "arch/x86/process.hh" 47#include "arch/x86/segmentregs.hh" 48#include "arch/x86/types.hh" 49#include "base/loader/object_file.hh" 50#include "base/loader/elf_object.hh" 51#include "base/misc.hh" 52#include "base/trace.hh" 53#include "cpu/thread_context.hh" 54#include "mem/page_table.hh" 55#include "mem/translating_port.hh" 56#include "sim/process_impl.hh" 57#include "sim/syscall_emul.hh" 58#include "sim/system.hh" 59 60using namespace std; 61using namespace X86ISA; 62 63static const int ArgumentReg[] = { 64 INTREG_RDI, 65 INTREG_RSI, 66 INTREG_RDX, 67 //This argument register is r10 for syscalls and rcx for C. 68 INTREG_R10W, 69 //INTREG_RCX, 70 INTREG_R8W, 71 INTREG_R9W 72}; 73static const int NumArgumentRegs = sizeof(ArgumentReg) / sizeof(const int); 74static const int ArgumentReg32[] = { 75 INTREG_EBX, 76 INTREG_ECX, 77 INTREG_EDX, 78 INTREG_ESI, 79 INTREG_EDI, 80}; 81static const int NumArgumentRegs32 = sizeof(ArgumentReg) / sizeof(const int); 82 83X86LiveProcess::X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile, 84 SyscallDesc *_syscallDescs, int _numSyscallDescs) : 85 LiveProcess(params, objFile), syscallDescs(_syscallDescs), 86 numSyscallDescs(_numSyscallDescs) 87{ 88 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 89 brk_point = roundUp(brk_point, VMPageSize); 90} 91 92X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params, 93 ObjectFile *objFile, SyscallDesc *_syscallDescs, 94 int _numSyscallDescs) : 95 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 96{ 97 98 vsyscallPage.base = 0xffffffffff600000ULL; 99 vsyscallPage.size = VMPageSize; 100 vsyscallPage.vtimeOffset = 0x400; 101 vsyscallPage.vgettimeofdayOffset = 0x410; 102 103 // Set up stack. On X86_64 Linux, stack goes from the top of memory 104 // downward, less the hole for the kernel address space plus one page 105 // for undertermined purposes. 106 stack_base = (Addr)0x7FFFFFFFF000ULL; 107 108 // Set pointer for next thread stack. Reserve 8M for main stack. 109 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 110 111 // Set up region for mmaps. This was determined empirically and may not 112 // always be correct. 113 mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL; 114} 115 116void 117I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc) 118{ 119 Addr eip = tc->readPC(); 120 if (eip >= vsyscallPage.base && 121 eip < vsyscallPage.base + vsyscallPage.size) { 122 tc->setNextPC(vsyscallPage.base + vsyscallPage.vsysexitOffset); 123 } 124 X86LiveProcess::syscall(callnum, tc); 125} 126 127 128I386LiveProcess::I386LiveProcess(LiveProcessParams *params, 129 ObjectFile *objFile, SyscallDesc *_syscallDescs, 130 int _numSyscallDescs) : 131 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 132{ 133 _gdtStart = ULL(0x100000000); 134 _gdtSize = VMPageSize; 135 136 vsyscallPage.base = 0xffffe000ULL; 137 vsyscallPage.size = VMPageSize; 138 vsyscallPage.vsyscallOffset = 0x400; 139 vsyscallPage.vsysexitOffset = 0x410; 140 141 stack_base = vsyscallPage.base; 142 143 // Set pointer for next thread stack. Reserve 8M for main stack. 144 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 145 146 // Set up region for mmaps. This was determined empirically and may not 147 // always be correct. 148 mmap_start = mmap_end = (Addr)0xf7ffe000ULL; 149} 150 151SyscallDesc* 152X86LiveProcess::getDesc(int callnum) 153{ 154 if (callnum < 0 || callnum >= numSyscallDescs) 155 return NULL; 156 return &syscallDescs[callnum]; 157} 158 159void 160X86_64LiveProcess::startup() 161{ 162 LiveProcess::startup(); 163 164 if (checkpointRestored) 165 return; 166 167 argsInit(sizeof(uint64_t), VMPageSize); 168 169 // Set up the vsyscall page for this process. 170 pTable->allocate(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::startup() 259{ 260 LiveProcess::startup(); 261 262 if (checkpointRestored) 263 return; 264 265 argsInit(sizeof(uint32_t), VMPageSize); 266 267 /* 268 * Set up a GDT for this process. The whole GDT wouldn't really be for 269 * this process, but the only parts we care about are. 270 */ 271 pTable->allocate(_gdtStart, _gdtSize); 272 uint64_t zero = 0; 273 assert(_gdtSize % sizeof(zero) == 0); 274 for (Addr gdtCurrent = _gdtStart; 275 gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) { 276 initVirtMem->write(gdtCurrent, zero); 277 } 278 279 // Set up the vsyscall page for this process. 280 pTable->allocate(vsyscallPage.base, vsyscallPage.size); 281 uint8_t vsyscallBlob[] = { 282 0x51, // push %ecx 283 0x52, // push %edp 284 0x55, // push %ebp 285 0x89, 0xe5, // mov %esp, %ebp 286 0x0f, 0x34 // sysenter 287 }; 288 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset, 289 vsyscallBlob, sizeof(vsyscallBlob)); 290 291 uint8_t vsysexitBlob[] = { 292 0x5d, // pop %ebp 293 0x5a, // pop %edx 294 0x59, // pop %ecx 295 0xc3 // ret 296 }; 297 initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset, 298 vsysexitBlob, sizeof(vsysexitBlob)); 299 300 for (int i = 0; i < contextIds.size(); i++) { 301 ThreadContext * tc = system->getThreadContext(contextIds[i]); 302 303 SegAttr dataAttr = 0; 304 dataAttr.dpl = 3; 305 dataAttr.unusable = 0; 306 dataAttr.defaultSize = 1; 307 dataAttr.longMode = 0; 308 dataAttr.avl = 0; 309 dataAttr.granularity = 1; 310 dataAttr.present = 1; 311 dataAttr.type = 3; 312 dataAttr.writable = 1; 313 dataAttr.readable = 1; 314 dataAttr.expandDown = 0; 315 dataAttr.system = 1; 316 317 //Initialize the segment registers. 318 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 319 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 320 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 321 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 322 tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB); 323 tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1)); 324 } 325 326 SegAttr csAttr = 0; 327 csAttr.dpl = 3; 328 csAttr.unusable = 0; 329 csAttr.defaultSize = 1; 330 csAttr.longMode = 0; 331 csAttr.avl = 0; 332 csAttr.granularity = 1; 333 csAttr.present = 1; 334 csAttr.type = 0xa; 335 csAttr.writable = 0; 336 csAttr.readable = 1; 337 csAttr.expandDown = 0; 338 csAttr.system = 1; 339 340 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 341 342 tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart); 343 tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart); 344 tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1); 345 346 // Set the LDT selector to 0 to deactivate it. 347 tc->setMiscRegNoEffect(MISCREG_TSL, 0); 348 349 Efer efer = 0; 350 efer.sce = 1; // Enable system call extensions. 351 efer.lme = 1; // Enable long mode. 352 efer.lma = 0; // Deactivate long mode. 353 efer.nxe = 1; // Enable nx support. 354 efer.svme = 0; // Disable svm support for now. It isn't implemented. 355 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 356 tc->setMiscReg(MISCREG_EFER, efer); 357 358 //Set up the registers that describe the operating mode. 359 CR0 cr0 = 0; 360 cr0.pg = 1; // Turn on paging. 361 cr0.cd = 0; // Don't disable caching. 362 cr0.nw = 0; // This is bit is defined to be ignored. 363 cr0.am = 0; // No alignment checking 364 cr0.wp = 0; // Supervisor mode can write read only pages 365 cr0.ne = 1; 366 cr0.et = 1; // This should always be 1 367 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 368 // would be pointless. 369 cr0.em = 0; // Allow x87 instructions to execute natively. 370 cr0.mp = 1; // This doesn't really matter, but the manual suggests 371 // setting it to one. 372 cr0.pe = 1; // We're definitely in protected mode. 373 tc->setMiscReg(MISCREG_CR0, cr0); 374 375 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 376 } 377} 378 379template<class IntType> 380void 381X86LiveProcess::argsInit(int pageSize, 382 std::vector<AuxVector<IntType> > extraAuxvs) 383{ 384 int intSize = sizeof(IntType); 385 386 typedef AuxVector<IntType> auxv_t; 387 std::vector<auxv_t> auxv = extraAuxvs; 388 389 string filename; 390 if(argv.size() < 1) 391 filename = ""; 392 else 393 filename = argv[0]; 394 395 //We want 16 byte alignment 396 uint64_t align = 16; 397 398 // load object file into target memory 399 objFile->loadSections(initVirtMem); 400 401 enum X86CpuFeature { 402 X86_OnboardFPU = 1 << 0, 403 X86_VirtualModeExtensions = 1 << 1, 404 X86_DebuggingExtensions = 1 << 2, 405 X86_PageSizeExtensions = 1 << 3, 406 407 X86_TimeStampCounter = 1 << 4, 408 X86_ModelSpecificRegisters = 1 << 5, 409 X86_PhysicalAddressExtensions = 1 << 6, 410 X86_MachineCheckExtensions = 1 << 7, 411 412 X86_CMPXCHG8Instruction = 1 << 8, 413 X86_OnboardAPIC = 1 << 9, 414 X86_SYSENTER_SYSEXIT = 1 << 11, 415 416 X86_MemoryTypeRangeRegisters = 1 << 12, 417 X86_PageGlobalEnable = 1 << 13, 418 X86_MachineCheckArchitecture = 1 << 14, 419 X86_CMOVInstruction = 1 << 15, 420 421 X86_PageAttributeTable = 1 << 16, 422 X86_36BitPSEs = 1 << 17, 423 X86_ProcessorSerialNumber = 1 << 18, 424 X86_CLFLUSHInstruction = 1 << 19, 425 426 X86_DebugTraceStore = 1 << 21, 427 X86_ACPIViaMSR = 1 << 22, 428 X86_MultimediaExtensions = 1 << 23, 429 430 X86_FXSAVE_FXRSTOR = 1 << 24, 431 X86_StreamingSIMDExtensions = 1 << 25, 432 X86_StreamingSIMDExtensions2 = 1 << 26, 433 X86_CPUSelfSnoop = 1 << 27, 434 435 X86_HyperThreading = 1 << 28, 436 X86_AutomaticClockControl = 1 << 29, 437 X86_IA64Processor = 1 << 30 438 }; 439 440 //Setup the auxilliary vectors. These will already have endian conversion. 441 //Auxilliary vectors are loaded only for elf formatted executables. 442 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 443 if(elfObject) 444 { 445 uint64_t features = 446 X86_OnboardFPU | 447 X86_VirtualModeExtensions | 448 X86_DebuggingExtensions | 449 X86_PageSizeExtensions | 450 X86_TimeStampCounter | 451 X86_ModelSpecificRegisters | 452 X86_PhysicalAddressExtensions | 453 X86_MachineCheckExtensions | 454 X86_CMPXCHG8Instruction | 455 X86_OnboardAPIC | 456 X86_SYSENTER_SYSEXIT | 457 X86_MemoryTypeRangeRegisters | 458 X86_PageGlobalEnable | 459 X86_MachineCheckArchitecture | 460 X86_CMOVInstruction | 461 X86_PageAttributeTable | 462 X86_36BitPSEs | 463// X86_ProcessorSerialNumber | 464 X86_CLFLUSHInstruction | 465// X86_DebugTraceStore | 466// X86_ACPIViaMSR | 467 X86_MultimediaExtensions | 468 X86_FXSAVE_FXRSTOR | 469 X86_StreamingSIMDExtensions | 470 X86_StreamingSIMDExtensions2 | 471// X86_CPUSelfSnoop | 472// X86_HyperThreading | 473// X86_AutomaticClockControl | 474// X86_IA64Processor | 475 0; 476 477 //Bits which describe the system hardware capabilities 478 //XXX Figure out what these should be 479 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 480 //The system page size 481 auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize)); 482 //Frequency at which times() increments 483 //Defined to be 100 in the kernel source. 484 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 485 // For statically linked executables, this is the virtual address of the 486 // program header tables if they appear in the executable image 487 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 488 // This is the size of a program header entry from the elf file. 489 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 490 // This is the number of program headers from the original elf file. 491 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 492 //This is the address of the elf "interpreter", It should be set 493 //to 0 for regular executables. It should be something else 494 //(not sure what) for dynamic libraries. 495 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 496 497 //XXX Figure out what this should be. 498 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 499 //The entry point to the program 500 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 501 //Different user and group IDs 502 auxv.push_back(auxv_t(M5_AT_UID, uid())); 503 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 504 auxv.push_back(auxv_t(M5_AT_GID, gid())); 505 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 506 //Whether to enable "secure mode" in the executable 507 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 508 //The address of 16 "random" bytes. 509 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 510 //The name of the program 511 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 512 //The platform string 513 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 514 } 515 516 //Figure out how big the initial stack needs to be 517 518 // A sentry NULL void pointer at the top of the stack. 519 int sentry_size = intSize; 520 521 //This is the name of the file which is present on the initial stack 522 //It's purpose is to let the user space linker examine the original file. 523 int file_name_size = filename.size() + 1; 524 525 const int numRandomBytes = 16; 526 int aux_data_size = numRandomBytes; 527 528 string platform = "x86_64"; 529 aux_data_size += platform.size() + 1; 530 531 int env_data_size = 0; 532 for (int i = 0; i < envp.size(); ++i) { 533 env_data_size += envp[i].size() + 1; 534 } 535 int arg_data_size = 0; 536 for (int i = 0; i < argv.size(); ++i) { 537 arg_data_size += argv[i].size() + 1; 538 } 539 540 //The info_block needs to be padded so it's size is a multiple of the 541 //alignment mask. Also, it appears that there needs to be at least some 542 //padding, so if the size is already a multiple, we need to increase it 543 //anyway. 544 int base_info_block_size = 545 sentry_size + file_name_size + env_data_size + arg_data_size; 546 547 int info_block_size = roundUp(base_info_block_size, align); 548 549 int info_block_padding = info_block_size - base_info_block_size; 550 551 //Each auxilliary vector is two 8 byte words 552 int aux_array_size = intSize * 2 * (auxv.size() + 1); 553 554 int envp_array_size = intSize * (envp.size() + 1); 555 int argv_array_size = intSize * (argv.size() + 1); 556 557 int argc_size = intSize; 558 559 //Figure out the size of the contents of the actual initial frame 560 int frame_size = 561 aux_array_size + 562 envp_array_size + 563 argv_array_size + 564 argc_size; 565 566 //There needs to be padding after the auxiliary vector data so that the 567 //very bottom of the stack is aligned properly. 568 int partial_size = frame_size + aux_data_size; 569 int aligned_partial_size = roundUp(partial_size, align); 570 int aux_padding = aligned_partial_size - partial_size; 571 572 int space_needed = 573 info_block_size + 574 aux_data_size + 575 aux_padding + 576 frame_size; 577 578 stack_min = stack_base - space_needed; 579 stack_min = roundDown(stack_min, align); 580 stack_size = stack_base - stack_min; 581 582 // map memory 583 pTable->allocate(roundDown(stack_min, pageSize), 584 roundUp(stack_size, pageSize)); 585 586 // map out initial stack contents 587 IntType sentry_base = stack_base - sentry_size; 588 IntType file_name_base = sentry_base - file_name_size; 589 IntType env_data_base = file_name_base - env_data_size; 590 IntType arg_data_base = env_data_base - arg_data_size; 591 IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size; 592 IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding; 593 IntType envp_array_base = auxv_array_base - envp_array_size; 594 IntType argv_array_base = envp_array_base - argv_array_size; 595 IntType argc_base = argv_array_base - argc_size; 596 597 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 598 DPRINTF(Stack, "0x%x - file name\n", file_name_base); 599 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 600 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 601 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 602 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 603 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 604 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 605 DPRINTF(Stack, "0x%x - argc \n", argc_base); 606 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 607 608 // write contents to stack 609 610 // figure out argc 611 IntType argc = argv.size(); 612 IntType guestArgc = X86ISA::htog(argc); 613 614 //Write out the sentry void * 615 IntType sentry_NULL = 0; 616 initVirtMem->writeBlob(sentry_base, 617 (uint8_t*)&sentry_NULL, sentry_size); 618 619 //Write the file name 620 initVirtMem->writeString(file_name_base, filename.c_str()); 621 622 //Fix up the aux vectors which point to data 623 assert(auxv[auxv.size() - 3].a_type == M5_AT_RANDOM); 624 auxv[auxv.size() - 3].a_val = aux_data_base; 625 assert(auxv[auxv.size() - 2].a_type == M5_AT_EXECFN); 626 auxv[auxv.size() - 2].a_val = argv_array_base; 627 assert(auxv[auxv.size() - 1].a_type == M5_AT_PLATFORM); 628 auxv[auxv.size() - 1].a_val = aux_data_base + numRandomBytes; 629 630 //Copy the aux stuff 631 for(int x = 0; x < auxv.size(); x++) 632 { 633 initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize, 634 (uint8_t*)&(auxv[x].a_type), intSize); 635 initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 636 (uint8_t*)&(auxv[x].a_val), intSize); 637 } 638 //Write out the terminating zeroed auxilliary vector 639 const uint64_t zero = 0; 640 initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 641 (uint8_t*)&zero, 2 * intSize); 642 643 initVirtMem->writeString(aux_data_base, platform.c_str()); 644 645 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 646 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 647 648 initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 649 650 ThreadContext *tc = system->getThreadContext(contextIds[0]); 651 //Set the stack pointer register 652 tc->setIntReg(StackPointerReg, stack_min); 653 654 Addr prog_entry = objFile->entryPoint(); 655 // There doesn't need to be any segment base added in since we're dealing 656 // with the flat segmentation model. 657 tc->setPC(prog_entry); 658 tc->setNextPC(prog_entry + sizeof(MachInst)); 659 660 //Align the "stack_min" to a page boundary. 661 stack_min = roundDown(stack_min, pageSize); 662 663// num_processes++; 664} 665 666void 667X86_64LiveProcess::argsInit(int intSize, int pageSize) 668{ 669 std::vector<AuxVector<uint64_t> > extraAuxvs; 670 extraAuxvs.push_back(AuxVector<uint64_t>(M5_AT_SYSINFO_EHDR, 671 vsyscallPage.base)); 672 X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs); 673} 674 675void 676I386LiveProcess::argsInit(int intSize, int pageSize) 677{ 678 std::vector<AuxVector<uint32_t> > extraAuxvs; 679 //Tell the binary where the vsyscall part of the vsyscall page is. 680 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO, 681 vsyscallPage.base + vsyscallPage.vsyscallOffset)); 682 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO_EHDR, 683 vsyscallPage.base)); 684 X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs); 685} 686 687void 688X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value) 689{ 690 tc->setIntReg(INTREG_RAX, return_value.value()); 691} 692 693X86ISA::IntReg 694X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 695{ 696 assert(i < NumArgumentRegs); 697 return tc->readIntReg(ArgumentReg[i++]); 698} 699 700void 701X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 702{ 703 assert(i < NumArgumentRegs); 704 return tc->setIntReg(ArgumentReg[i], val); 705} 706 707X86ISA::IntReg 708I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 709{ 710 assert(i < NumArgumentRegs32); 711 return tc->readIntReg(ArgumentReg32[i++]); 712} 713 714X86ISA::IntReg 715I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width) 716{ 717 assert(width == 32 || width == 64); 718 assert(i < NumArgumentRegs); 719 uint64_t retVal = tc->readIntReg(ArgumentReg32[i++]) & mask(32); 720 if (width == 64) 721 retVal |= ((uint64_t)tc->readIntReg(ArgumentReg[i++]) << 32); 722 return retVal; 723} 724 725void 726I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 727{ 728 assert(i < NumArgumentRegs); 729 return tc->setIntReg(ArgumentReg[i], val); 730} 731