process.cc revision 9679
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 "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 = 0x0; 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 TheISA::PCState pc = tc->pcState(); 120 Addr eip = pc.pc(); 121 if (eip >= vsyscallPage.base && 122 eip < vsyscallPage.base + vsyscallPage.size) { 123 pc.npc(vsyscallPage.base + vsyscallPage.vsysexitOffset); 124 tc->pcState(pc); 125 } 126 X86LiveProcess::syscall(callnum, tc); 127} 128 129 130I386LiveProcess::I386LiveProcess(LiveProcessParams *params, 131 ObjectFile *objFile, SyscallDesc *_syscallDescs, 132 int _numSyscallDescs) : 133 X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs) 134{ 135 _gdtStart = ULL(0xffffd000); 136 _gdtSize = VMPageSize; 137 138 vsyscallPage.base = 0xffffe000ULL; 139 vsyscallPage.size = VMPageSize; 140 vsyscallPage.vsyscallOffset = 0x400; 141 vsyscallPage.vsysexitOffset = 0x410; 142 143 stack_base = _gdtStart; 144 145 // Set pointer for next thread stack. Reserve 8M for main stack. 146 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 147 148 // Set up region for mmaps. This was determined empirically and may not 149 // always be correct. 150 mmap_start = mmap_end = (Addr)0xf7ffe000ULL; 151} 152 153SyscallDesc* 154X86LiveProcess::getDesc(int callnum) 155{ 156 if (callnum < 0 || callnum >= numSyscallDescs) 157 return NULL; 158 return &syscallDescs[callnum]; 159} 160 161void 162X86_64LiveProcess::initState() 163{ 164 X86LiveProcess::initState(); 165 166 argsInit(sizeof(uint64_t), VMPageSize); 167 168 // Set up the vsyscall page for this process. 169 allocateMem(vsyscallPage.base, vsyscallPage.size); 170 uint8_t vtimeBlob[] = { 171 0x48,0xc7,0xc0,0xc9,0x00,0x00,0x00, // mov $0xc9,%rax 172 0x0f,0x05, // syscall 173 0xc3 // retq 174 }; 175 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vtimeOffset, 176 vtimeBlob, sizeof(vtimeBlob)); 177 178 uint8_t vgettimeofdayBlob[] = { 179 0x48,0xc7,0xc0,0x60,0x00,0x00,0x00, // mov $0x60,%rax 180 0x0f,0x05, // syscall 181 0xc3 // retq 182 }; 183 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vgettimeofdayOffset, 184 vgettimeofdayBlob, sizeof(vgettimeofdayBlob)); 185 186 for (int i = 0; i < contextIds.size(); i++) { 187 ThreadContext * tc = system->getThreadContext(contextIds[i]); 188 189 SegAttr dataAttr = 0; 190 dataAttr.dpl = 3; 191 dataAttr.unusable = 0; 192 dataAttr.defaultSize = 1; 193 dataAttr.longMode = 1; 194 dataAttr.avl = 0; 195 dataAttr.granularity = 1; 196 dataAttr.present = 1; 197 dataAttr.type = 3; 198 dataAttr.writable = 1; 199 dataAttr.readable = 1; 200 dataAttr.expandDown = 0; 201 dataAttr.system = 1; 202 203 //Initialize the segment registers. 204 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 205 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 206 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 207 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 208 } 209 210 SegAttr csAttr = 0; 211 csAttr.dpl = 3; 212 csAttr.unusable = 0; 213 csAttr.defaultSize = 0; 214 csAttr.longMode = 1; 215 csAttr.avl = 0; 216 csAttr.granularity = 1; 217 csAttr.present = 1; 218 csAttr.type = 10; 219 csAttr.writable = 0; 220 csAttr.readable = 1; 221 csAttr.expandDown = 0; 222 csAttr.system = 1; 223 224 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 225 226 Efer efer = 0; 227 efer.sce = 1; // Enable system call extensions. 228 efer.lme = 1; // Enable long mode. 229 efer.lma = 1; // Activate long mode. 230 efer.nxe = 1; // Enable nx support. 231 efer.svme = 0; // Disable svm support for now. It isn't implemented. 232 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 233 tc->setMiscReg(MISCREG_EFER, efer); 234 235 //Set up the registers that describe the operating mode. 236 CR0 cr0 = 0; 237 cr0.pg = 1; // Turn on paging. 238 cr0.cd = 0; // Don't disable caching. 239 cr0.nw = 0; // This is bit is defined to be ignored. 240 cr0.am = 0; // No alignment checking 241 cr0.wp = 0; // Supervisor mode can write read only pages 242 cr0.ne = 1; 243 cr0.et = 1; // This should always be 1 244 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 245 // would be pointless. 246 cr0.em = 0; // Allow x87 instructions to execute natively. 247 cr0.mp = 1; // This doesn't really matter, but the manual suggests 248 // setting it to one. 249 cr0.pe = 1; // We're definitely in protected mode. 250 tc->setMiscReg(MISCREG_CR0, cr0); 251 252 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 253 } 254} 255 256void 257I386LiveProcess::initState() 258{ 259 X86LiveProcess::initState(); 260 261 argsInit(sizeof(uint32_t), VMPageSize); 262 263 /* 264 * Set up a GDT for this process. The whole GDT wouldn't really be for 265 * this process, but the only parts we care about are. 266 */ 267 allocateMem(_gdtStart, _gdtSize); 268 uint64_t zero = 0; 269 assert(_gdtSize % sizeof(zero) == 0); 270 for (Addr gdtCurrent = _gdtStart; 271 gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) { 272 initVirtMem.write(gdtCurrent, zero); 273 } 274 275 // Set up the vsyscall page for this process. 276 allocateMem(vsyscallPage.base, vsyscallPage.size); 277 uint8_t vsyscallBlob[] = { 278 0x51, // push %ecx 279 0x52, // push %edp 280 0x55, // push %ebp 281 0x89, 0xe5, // mov %esp, %ebp 282 0x0f, 0x34 // sysenter 283 }; 284 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset, 285 vsyscallBlob, sizeof(vsyscallBlob)); 286 287 uint8_t vsysexitBlob[] = { 288 0x5d, // pop %ebp 289 0x5a, // pop %edx 290 0x59, // pop %ecx 291 0xc3 // ret 292 }; 293 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset, 294 vsysexitBlob, sizeof(vsysexitBlob)); 295 296 for (int i = 0; i < contextIds.size(); i++) { 297 ThreadContext * tc = system->getThreadContext(contextIds[i]); 298 299 SegAttr dataAttr = 0; 300 dataAttr.dpl = 3; 301 dataAttr.unusable = 0; 302 dataAttr.defaultSize = 1; 303 dataAttr.longMode = 0; 304 dataAttr.avl = 0; 305 dataAttr.granularity = 1; 306 dataAttr.present = 1; 307 dataAttr.type = 3; 308 dataAttr.writable = 1; 309 dataAttr.readable = 1; 310 dataAttr.expandDown = 0; 311 dataAttr.system = 1; 312 313 //Initialize the segment registers. 314 for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 315 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 316 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 317 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 318 tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB); 319 tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1)); 320 } 321 322 SegAttr csAttr = 0; 323 csAttr.dpl = 3; 324 csAttr.unusable = 0; 325 csAttr.defaultSize = 1; 326 csAttr.longMode = 0; 327 csAttr.avl = 0; 328 csAttr.granularity = 1; 329 csAttr.present = 1; 330 csAttr.type = 0xa; 331 csAttr.writable = 0; 332 csAttr.readable = 1; 333 csAttr.expandDown = 0; 334 csAttr.system = 1; 335 336 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 337 338 tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart); 339 tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart); 340 tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1); 341 342 // Set the LDT selector to 0 to deactivate it. 343 tc->setMiscRegNoEffect(MISCREG_TSL, 0); 344 345 Efer efer = 0; 346 efer.sce = 1; // Enable system call extensions. 347 efer.lme = 1; // Enable long mode. 348 efer.lma = 0; // Deactivate long mode. 349 efer.nxe = 1; // Enable nx support. 350 efer.svme = 0; // Disable svm support for now. It isn't implemented. 351 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 352 tc->setMiscReg(MISCREG_EFER, efer); 353 354 //Set up the registers that describe the operating mode. 355 CR0 cr0 = 0; 356 cr0.pg = 1; // Turn on paging. 357 cr0.cd = 0; // Don't disable caching. 358 cr0.nw = 0; // This is bit is defined to be ignored. 359 cr0.am = 0; // No alignment checking 360 cr0.wp = 0; // Supervisor mode can write read only pages 361 cr0.ne = 1; 362 cr0.et = 1; // This should always be 1 363 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 364 // would be pointless. 365 cr0.em = 0; // Allow x87 instructions to execute natively. 366 cr0.mp = 1; // This doesn't really matter, but the manual suggests 367 // setting it to one. 368 cr0.pe = 1; // We're definitely in protected mode. 369 tc->setMiscReg(MISCREG_CR0, cr0); 370 371 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 372 } 373} 374 375template<class IntType> 376void 377X86LiveProcess::argsInit(int pageSize, 378 std::vector<AuxVector<IntType> > extraAuxvs) 379{ 380 int intSize = sizeof(IntType); 381 382 typedef AuxVector<IntType> auxv_t; 383 std::vector<auxv_t> auxv = extraAuxvs; 384 385 string filename; 386 if(argv.size() < 1) 387 filename = ""; 388 else 389 filename = argv[0]; 390 391 //We want 16 byte alignment 392 uint64_t align = 16; 393 394 // load object file into target memory 395 objFile->loadSections(initVirtMem); 396 397 enum X86CpuFeature { 398 X86_OnboardFPU = 1 << 0, 399 X86_VirtualModeExtensions = 1 << 1, 400 X86_DebuggingExtensions = 1 << 2, 401 X86_PageSizeExtensions = 1 << 3, 402 403 X86_TimeStampCounter = 1 << 4, 404 X86_ModelSpecificRegisters = 1 << 5, 405 X86_PhysicalAddressExtensions = 1 << 6, 406 X86_MachineCheckExtensions = 1 << 7, 407 408 X86_CMPXCHG8Instruction = 1 << 8, 409 X86_OnboardAPIC = 1 << 9, 410 X86_SYSENTER_SYSEXIT = 1 << 11, 411 412 X86_MemoryTypeRangeRegisters = 1 << 12, 413 X86_PageGlobalEnable = 1 << 13, 414 X86_MachineCheckArchitecture = 1 << 14, 415 X86_CMOVInstruction = 1 << 15, 416 417 X86_PageAttributeTable = 1 << 16, 418 X86_36BitPSEs = 1 << 17, 419 X86_ProcessorSerialNumber = 1 << 18, 420 X86_CLFLUSHInstruction = 1 << 19, 421 422 X86_DebugTraceStore = 1 << 21, 423 X86_ACPIViaMSR = 1 << 22, 424 X86_MultimediaExtensions = 1 << 23, 425 426 X86_FXSAVE_FXRSTOR = 1 << 24, 427 X86_StreamingSIMDExtensions = 1 << 25, 428 X86_StreamingSIMDExtensions2 = 1 << 26, 429 X86_CPUSelfSnoop = 1 << 27, 430 431 X86_HyperThreading = 1 << 28, 432 X86_AutomaticClockControl = 1 << 29, 433 X86_IA64Processor = 1 << 30 434 }; 435 436 //Setup the auxilliary vectors. These will already have endian conversion. 437 //Auxilliary vectors are loaded only for elf formatted executables. 438 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 439 if(elfObject) 440 { 441 uint64_t features = 442 X86_OnboardFPU | 443 X86_VirtualModeExtensions | 444 X86_DebuggingExtensions | 445 X86_PageSizeExtensions | 446 X86_TimeStampCounter | 447 X86_ModelSpecificRegisters | 448 X86_PhysicalAddressExtensions | 449 X86_MachineCheckExtensions | 450 X86_CMPXCHG8Instruction | 451 X86_OnboardAPIC | 452 X86_SYSENTER_SYSEXIT | 453 X86_MemoryTypeRangeRegisters | 454 X86_PageGlobalEnable | 455 X86_MachineCheckArchitecture | 456 X86_CMOVInstruction | 457 X86_PageAttributeTable | 458 X86_36BitPSEs | 459// X86_ProcessorSerialNumber | 460 X86_CLFLUSHInstruction | 461// X86_DebugTraceStore | 462// X86_ACPIViaMSR | 463 X86_MultimediaExtensions | 464 X86_FXSAVE_FXRSTOR | 465 X86_StreamingSIMDExtensions | 466 X86_StreamingSIMDExtensions2 | 467// X86_CPUSelfSnoop | 468// X86_HyperThreading | 469// X86_AutomaticClockControl | 470// X86_IA64Processor | 471 0; 472 473 //Bits which describe the system hardware capabilities 474 //XXX Figure out what these should be 475 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 476 //The system page size 477 auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize)); 478 //Frequency at which times() increments 479 //Defined to be 100 in the kernel source. 480 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 481 // For statically linked executables, this is the virtual address of the 482 // program header tables if they appear in the executable image 483 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 484 // This is the size of a program header entry from the elf file. 485 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 486 // This is the number of program headers from the original elf file. 487 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 488 //This is the address of the elf "interpreter", It should be set 489 //to 0 for regular executables. It should be something else 490 //(not sure what) for dynamic libraries. 491 auxv.push_back(auxv_t(M5_AT_BASE, 0)); 492 493 //XXX Figure out what this should be. 494 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 495 //The entry point to the program 496 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 497 //Different user and group IDs 498 auxv.push_back(auxv_t(M5_AT_UID, uid())); 499 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 500 auxv.push_back(auxv_t(M5_AT_GID, gid())); 501 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 502 //Whether to enable "secure mode" in the executable 503 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 504 //The address of 16 "random" bytes. 505 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 506 //The name of the program 507 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 508 //The platform string 509 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 510 } 511 512 //Figure out how big the initial stack needs to be 513 514 // A sentry NULL void pointer at the top of the stack. 515 int sentry_size = intSize; 516 517 //This is the name of the file which is present on the initial stack 518 //It's purpose is to let the user space linker examine the original file. 519 int file_name_size = filename.size() + 1; 520 521 const int numRandomBytes = 16; 522 int aux_data_size = numRandomBytes; 523 524 string platform = "x86_64"; 525 aux_data_size += platform.size() + 1; 526 527 int env_data_size = 0; 528 for (int i = 0; i < envp.size(); ++i) { 529 env_data_size += envp[i].size() + 1; 530 } 531 int arg_data_size = 0; 532 for (int i = 0; i < argv.size(); ++i) { 533 arg_data_size += argv[i].size() + 1; 534 } 535 536 //The info_block needs to be padded so it's size is a multiple of the 537 //alignment mask. Also, it appears that there needs to be at least some 538 //padding, so if the size is already a multiple, we need to increase it 539 //anyway. 540 int base_info_block_size = 541 sentry_size + file_name_size + env_data_size + arg_data_size; 542 543 int info_block_size = roundUp(base_info_block_size, align); 544 545 int info_block_padding = info_block_size - base_info_block_size; 546 547 //Each auxilliary vector is two 8 byte words 548 int aux_array_size = intSize * 2 * (auxv.size() + 1); 549 550 int envp_array_size = intSize * (envp.size() + 1); 551 int argv_array_size = intSize * (argv.size() + 1); 552 553 int argc_size = intSize; 554 555 //Figure out the size of the contents of the actual initial frame 556 int frame_size = 557 aux_array_size + 558 envp_array_size + 559 argv_array_size + 560 argc_size; 561 562 //There needs to be padding after the auxiliary vector data so that the 563 //very bottom of the stack is aligned properly. 564 int partial_size = frame_size + aux_data_size; 565 int aligned_partial_size = roundUp(partial_size, align); 566 int aux_padding = aligned_partial_size - partial_size; 567 568 int space_needed = 569 info_block_size + 570 aux_data_size + 571 aux_padding + 572 frame_size; 573 574 stack_min = stack_base - space_needed; 575 stack_min = roundDown(stack_min, align); 576 stack_size = stack_base - stack_min; 577 578 // map memory 579 allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); 580 581 // map out initial stack contents 582 IntType sentry_base = stack_base - sentry_size; 583 IntType file_name_base = sentry_base - file_name_size; 584 IntType env_data_base = file_name_base - env_data_size; 585 IntType arg_data_base = env_data_base - arg_data_size; 586 IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size; 587 IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding; 588 IntType envp_array_base = auxv_array_base - envp_array_size; 589 IntType argv_array_base = envp_array_base - argv_array_size; 590 IntType argc_base = argv_array_base - argc_size; 591 592 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 593 DPRINTF(Stack, "0x%x - file name\n", file_name_base); 594 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 595 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 596 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 597 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 598 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 599 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 600 DPRINTF(Stack, "0x%x - argc \n", argc_base); 601 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 602 603 // write contents to stack 604 605 // figure out argc 606 IntType argc = argv.size(); 607 IntType guestArgc = X86ISA::htog(argc); 608 609 //Write out the sentry void * 610 IntType sentry_NULL = 0; 611 initVirtMem.writeBlob(sentry_base, 612 (uint8_t*)&sentry_NULL, sentry_size); 613 614 //Write the file name 615 initVirtMem.writeString(file_name_base, filename.c_str()); 616 617 //Fix up the aux vectors which point to data 618 assert(auxv[auxv.size() - 3].a_type == M5_AT_RANDOM); 619 auxv[auxv.size() - 3].a_val = aux_data_base; 620 assert(auxv[auxv.size() - 2].a_type == M5_AT_EXECFN); 621 auxv[auxv.size() - 2].a_val = argv_array_base; 622 assert(auxv[auxv.size() - 1].a_type == M5_AT_PLATFORM); 623 auxv[auxv.size() - 1].a_val = aux_data_base + numRandomBytes; 624 625 //Copy the aux stuff 626 for(int x = 0; x < auxv.size(); x++) 627 { 628 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 629 (uint8_t*)&(auxv[x].a_type), intSize); 630 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 631 (uint8_t*)&(auxv[x].a_val), intSize); 632 } 633 //Write out the terminating zeroed auxilliary vector 634 const uint64_t zero = 0; 635 initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 636 (uint8_t*)&zero, 2 * intSize); 637 638 initVirtMem.writeString(aux_data_base, platform.c_str()); 639 640 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 641 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 642 643 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 644 645 ThreadContext *tc = system->getThreadContext(contextIds[0]); 646 //Set the stack pointer register 647 tc->setIntReg(StackPointerReg, stack_min); 648 649 // There doesn't need to be any segment base added in since we're dealing 650 // with the flat segmentation model. 651 tc->pcState(objFile->entryPoint()); 652 653 //Align the "stack_min" to a page boundary. 654 stack_min = roundDown(stack_min, pageSize); 655 656// num_processes++; 657} 658 659void 660X86_64LiveProcess::argsInit(int intSize, int pageSize) 661{ 662 std::vector<AuxVector<uint64_t> > extraAuxvs; 663 extraAuxvs.push_back(AuxVector<uint64_t>(M5_AT_SYSINFO_EHDR, 664 vsyscallPage.base)); 665 X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs); 666} 667 668void 669I386LiveProcess::argsInit(int intSize, int pageSize) 670{ 671 std::vector<AuxVector<uint32_t> > extraAuxvs; 672 //Tell the binary where the vsyscall part of the vsyscall page is. 673 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO, 674 vsyscallPage.base + vsyscallPage.vsyscallOffset)); 675 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO_EHDR, 676 vsyscallPage.base)); 677 X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs); 678} 679 680void 681X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value) 682{ 683 tc->setIntReg(INTREG_RAX, return_value.value()); 684} 685 686X86ISA::IntReg 687X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 688{ 689 assert(i < NumArgumentRegs); 690 return tc->readIntReg(ArgumentReg[i++]); 691} 692 693void 694X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 695{ 696 assert(i < NumArgumentRegs); 697 return tc->setIntReg(ArgumentReg[i], val); 698} 699 700X86ISA::IntReg 701I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i) 702{ 703 assert(i < NumArgumentRegs32); 704 return tc->readIntReg(ArgumentReg32[i++]); 705} 706 707X86ISA::IntReg 708I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width) 709{ 710 assert(width == 32 || width == 64); 711 assert(i < NumArgumentRegs); 712 uint64_t retVal = tc->readIntReg(ArgumentReg32[i++]) & mask(32); 713 if (width == 64) 714 retVal |= ((uint64_t)tc->readIntReg(ArgumentReg[i++]) << 32); 715 return retVal; 716} 717 718void 719I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 720{ 721 assert(i < NumArgumentRegs); 722 return tc->setIntReg(ArgumentReg[i], val); 723} 724