process.cc revision 12460:0f221912b014
1/* 2 * Copyright (c) 2014 Advanced Micro Devices, Inc. 3 * Copyright (c) 2007 The Hewlett-Packard Development Company 4 * All rights reserved. 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Copyright (c) 2003-2006 The Regents of The University of Michigan 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Gabe Black 42 * Ali Saidi 43 */ 44 45#include "arch/x86/process.hh" 46 47#include <string> 48#include <vector> 49 50#include "arch/x86/isa_traits.hh" 51#include "arch/x86/regs/misc.hh" 52#include "arch/x86/regs/segment.hh" 53#include "arch/x86/system.hh" 54#include "arch/x86/types.hh" 55#include "base/loader/elf_object.hh" 56#include "base/loader/object_file.hh" 57#include "base/logging.hh" 58#include "base/trace.hh" 59#include "cpu/thread_context.hh" 60#include "debug/Stack.hh" 61#include "mem/multi_level_page_table.hh" 62#include "mem/page_table.hh" 63#include "params/Process.hh" 64#include "sim/aux_vector.hh" 65#include "sim/process_impl.hh" 66#include "sim/syscall_desc.hh" 67#include "sim/syscall_return.hh" 68#include "sim/system.hh" 69 70using namespace std; 71using namespace X86ISA; 72 73static const int ArgumentReg[] = { 74 INTREG_RDI, 75 INTREG_RSI, 76 INTREG_RDX, 77 // This argument register is r10 for syscalls and rcx for C. 78 INTREG_R10W, 79 // INTREG_RCX, 80 INTREG_R8W, 81 INTREG_R9W 82}; 83 84static const int NumArgumentRegs M5_VAR_USED = 85 sizeof(ArgumentReg) / sizeof(const int); 86 87static const int ArgumentReg32[] = { 88 INTREG_EBX, 89 INTREG_ECX, 90 INTREG_EDX, 91 INTREG_ESI, 92 INTREG_EDI, 93 INTREG_EBP 94}; 95 96static const int NumArgumentRegs32 M5_VAR_USED = 97 sizeof(ArgumentReg) / sizeof(const int); 98 99template class MultiLevelPageTable<LongModePTE<47, 39>, 100 LongModePTE<38, 30>, 101 LongModePTE<29, 21>, 102 LongModePTE<20, 12> >; 103typedef MultiLevelPageTable<LongModePTE<47, 39>, 104 LongModePTE<38, 30>, 105 LongModePTE<29, 21>, 106 LongModePTE<20, 12> > ArchPageTable; 107 108X86Process::X86Process(ProcessParams *params, ObjectFile *objFile, 109 SyscallDesc *_syscallDescs, int _numSyscallDescs) 110 : Process(params, params->useArchPT ? 111 static_cast<EmulationPageTable *>( 112 new ArchPageTable(params->name, params->pid, 113 params->system, PageBytes)) : 114 new EmulationPageTable(params->name, params->pid, 115 PageBytes), 116 objFile), 117 syscallDescs(_syscallDescs), numSyscallDescs(_numSyscallDescs) 118{ 119} 120 121void X86Process::clone(ThreadContext *old_tc, ThreadContext *new_tc, 122 Process *p, TheISA::IntReg flags) 123{ 124 Process::clone(old_tc, new_tc, p, flags); 125 X86Process *process = (X86Process*)p; 126 *process = *this; 127} 128 129X86_64Process::X86_64Process(ProcessParams *params, ObjectFile *objFile, 130 SyscallDesc *_syscallDescs, int _numSyscallDescs) 131 : X86Process(params, objFile, _syscallDescs, _numSyscallDescs) 132{ 133 134 vsyscallPage.base = 0xffffffffff600000ULL; 135 vsyscallPage.size = PageBytes; 136 vsyscallPage.vtimeOffset = 0x400; 137 vsyscallPage.vgettimeofdayOffset = 0x0; 138 139 Addr brk_point = roundUp(objFile->dataBase() + objFile->dataSize() + 140 objFile->bssSize(), PageBytes); 141 Addr stack_base = 0x7FFFFFFFF000ULL; 142 Addr max_stack_size = 8 * 1024 * 1024; 143 Addr next_thread_stack_base = stack_base - max_stack_size; 144 Addr mmap_end = 0x7FFFF7FFF000ULL; 145 146 memState = make_shared<MemState>(brk_point, stack_base, max_stack_size, 147 next_thread_stack_base, mmap_end); 148} 149 150void 151I386Process::syscall(int64_t callnum, ThreadContext *tc, Fault *fault) 152{ 153 TheISA::PCState pc = tc->pcState(); 154 Addr eip = pc.pc(); 155 if (eip >= vsyscallPage.base && 156 eip < vsyscallPage.base + vsyscallPage.size) { 157 pc.npc(vsyscallPage.base + vsyscallPage.vsysexitOffset); 158 tc->pcState(pc); 159 } 160 X86Process::syscall(callnum, tc, fault); 161} 162 163 164I386Process::I386Process(ProcessParams *params, ObjectFile *objFile, 165 SyscallDesc *_syscallDescs, int _numSyscallDescs) 166 : X86Process(params, objFile, _syscallDescs, _numSyscallDescs) 167{ 168 _gdtStart = ULL(0xffffd000); 169 _gdtSize = PageBytes; 170 171 vsyscallPage.base = 0xffffe000ULL; 172 vsyscallPage.size = PageBytes; 173 vsyscallPage.vsyscallOffset = 0x400; 174 vsyscallPage.vsysexitOffset = 0x410; 175 176 Addr brk_point = roundUp(objFile->dataBase() + objFile->dataSize() + 177 objFile->bssSize(), PageBytes); 178 Addr stack_base = _gdtStart; 179 Addr max_stack_size = 8 * 1024 * 1024; 180 Addr next_thread_stack_base = stack_base - max_stack_size; 181 Addr mmap_end = 0xB7FFF000ULL; 182 183 memState = make_shared<MemState>(brk_point, stack_base, max_stack_size, 184 next_thread_stack_base, mmap_end); 185} 186 187SyscallDesc* 188X86Process::getDesc(int callnum) 189{ 190 if (callnum < 0 || callnum >= numSyscallDescs) 191 return NULL; 192 return &syscallDescs[callnum]; 193} 194 195void 196X86_64Process::initState() 197{ 198 X86Process::initState(); 199 200 argsInit(PageBytes); 201 202 // Set up the vsyscall page for this process. 203 allocateMem(vsyscallPage.base, vsyscallPage.size); 204 uint8_t vtimeBlob[] = { 205 0x48,0xc7,0xc0,0xc9,0x00,0x00,0x00, // mov $0xc9,%rax 206 0x0f,0x05, // syscall 207 0xc3 // retq 208 }; 209 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vtimeOffset, 210 vtimeBlob, sizeof(vtimeBlob)); 211 212 uint8_t vgettimeofdayBlob[] = { 213 0x48,0xc7,0xc0,0x60,0x00,0x00,0x00, // mov $0x60,%rax 214 0x0f,0x05, // syscall 215 0xc3 // retq 216 }; 217 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vgettimeofdayOffset, 218 vgettimeofdayBlob, sizeof(vgettimeofdayBlob)); 219 220 if (kvmInSE) { 221 PortProxy physProxy = system->physProxy; 222 223 Addr syscallCodePhysAddr = system->allocPhysPages(1); 224 Addr gdtPhysAddr = system->allocPhysPages(1); 225 Addr idtPhysAddr = system->allocPhysPages(1); 226 Addr istPhysAddr = system->allocPhysPages(1); 227 Addr tssPhysAddr = system->allocPhysPages(1); 228 Addr pfHandlerPhysAddr = system->allocPhysPages(1); 229 230 /* 231 * Set up the gdt. 232 */ 233 uint8_t numGDTEntries = 0; 234 uint64_t nullDescriptor = 0; 235 physProxy.writeBlob(gdtPhysAddr + numGDTEntries * 8, 236 (uint8_t *)(&nullDescriptor), 8); 237 numGDTEntries++; 238 239 SegDescriptor initDesc = 0; 240 initDesc.type.codeOrData = 0; // code or data type 241 initDesc.type.c = 0; // conforming 242 initDesc.type.r = 1; // readable 243 initDesc.dpl = 0; // privilege 244 initDesc.p = 1; // present 245 initDesc.l = 1; // longmode - 64 bit 246 initDesc.d = 0; // operand size 247 initDesc.g = 1; // granularity 248 initDesc.s = 1; // system segment 249 initDesc.limitHigh = 0xFFFF; 250 initDesc.limitLow = 0xF; 251 initDesc.baseHigh = 0x0; 252 initDesc.baseLow = 0x0; 253 254 //64 bit code segment 255 SegDescriptor csLowPLDesc = initDesc; 256 csLowPLDesc.type.codeOrData = 1; 257 csLowPLDesc.dpl = 0; 258 uint64_t csLowPLDescVal = csLowPLDesc; 259 physProxy.writeBlob(gdtPhysAddr + numGDTEntries * 8, 260 (uint8_t *)(&csLowPLDescVal), 8); 261 262 numGDTEntries++; 263 264 SegSelector csLowPL = 0; 265 csLowPL.si = numGDTEntries - 1; 266 csLowPL.rpl = 0; 267 268 //64 bit data segment 269 SegDescriptor dsLowPLDesc = initDesc; 270 dsLowPLDesc.type.codeOrData = 0; 271 dsLowPLDesc.dpl = 0; 272 uint64_t dsLowPLDescVal = dsLowPLDesc; 273 physProxy.writeBlob(gdtPhysAddr + numGDTEntries * 8, 274 (uint8_t *)(&dsLowPLDescVal), 8); 275 276 numGDTEntries++; 277 278 SegSelector dsLowPL = 0; 279 dsLowPL.si = numGDTEntries - 1; 280 dsLowPL.rpl = 0; 281 282 //64 bit data segment 283 SegDescriptor dsDesc = initDesc; 284 dsDesc.type.codeOrData = 0; 285 dsDesc.dpl = 3; 286 uint64_t dsDescVal = dsDesc; 287 physProxy.writeBlob(gdtPhysAddr + numGDTEntries * 8, 288 (uint8_t *)(&dsDescVal), 8); 289 290 numGDTEntries++; 291 292 SegSelector ds = 0; 293 ds.si = numGDTEntries - 1; 294 ds.rpl = 3; 295 296 //64 bit code segment 297 SegDescriptor csDesc = initDesc; 298 csDesc.type.codeOrData = 1; 299 csDesc.dpl = 3; 300 uint64_t csDescVal = csDesc; 301 physProxy.writeBlob(gdtPhysAddr + numGDTEntries * 8, 302 (uint8_t *)(&csDescVal), 8); 303 304 numGDTEntries++; 305 306 SegSelector cs = 0; 307 cs.si = numGDTEntries - 1; 308 cs.rpl = 3; 309 310 SegSelector scall = 0; 311 scall.si = csLowPL.si; 312 scall.rpl = 0; 313 314 SegSelector sret = 0; 315 sret.si = dsLowPL.si; 316 sret.rpl = 3; 317 318 /* In long mode the TSS has been extended to 16 Bytes */ 319 TSSlow TSSDescLow = 0; 320 TSSDescLow.type = 0xB; 321 TSSDescLow.dpl = 0; // Privelege level 0 322 TSSDescLow.p = 1; // Present 323 TSSDescLow.g = 1; // Page granularity 324 TSSDescLow.limitHigh = 0xF; 325 TSSDescLow.limitLow = 0xFFFF; 326 TSSDescLow.baseLow = bits(TSSVirtAddr, 23, 0); 327 TSSDescLow.baseHigh = bits(TSSVirtAddr, 31, 24); 328 329 TSShigh TSSDescHigh = 0; 330 TSSDescHigh.base = bits(TSSVirtAddr, 63, 32); 331 332 struct TSSDesc { 333 uint64_t low; 334 uint64_t high; 335 } tssDescVal = {TSSDescLow, TSSDescHigh}; 336 337 physProxy.writeBlob(gdtPhysAddr + numGDTEntries * 8, 338 (uint8_t *)(&tssDescVal), sizeof(tssDescVal)); 339 340 numGDTEntries++; 341 342 SegSelector tssSel = 0; 343 tssSel.si = numGDTEntries - 1; 344 345 uint64_t tss_base_addr = (TSSDescHigh.base << 32) | 346 (TSSDescLow.baseHigh << 24) | 347 TSSDescLow.baseLow; 348 uint64_t tss_limit = TSSDescLow.limitLow | (TSSDescLow.limitHigh << 16); 349 350 SegAttr tss_attr = 0; 351 352 tss_attr.type = TSSDescLow.type; 353 tss_attr.dpl = TSSDescLow.dpl; 354 tss_attr.present = TSSDescLow.p; 355 tss_attr.granularity = TSSDescLow.g; 356 tss_attr.unusable = 0; 357 358 for (int i = 0; i < contextIds.size(); i++) { 359 ThreadContext * tc = system->getThreadContext(contextIds[i]); 360 361 tc->setMiscReg(MISCREG_CS, cs); 362 tc->setMiscReg(MISCREG_DS, ds); 363 tc->setMiscReg(MISCREG_ES, ds); 364 tc->setMiscReg(MISCREG_FS, ds); 365 tc->setMiscReg(MISCREG_GS, ds); 366 tc->setMiscReg(MISCREG_SS, ds); 367 368 // LDT 369 tc->setMiscReg(MISCREG_TSL, 0); 370 SegAttr tslAttr = 0; 371 tslAttr.present = 1; 372 tslAttr.type = 2; 373 tc->setMiscReg(MISCREG_TSL_ATTR, tslAttr); 374 375 tc->setMiscReg(MISCREG_TSG_BASE, GDTVirtAddr); 376 tc->setMiscReg(MISCREG_TSG_LIMIT, 8 * numGDTEntries - 1); 377 378 tc->setMiscReg(MISCREG_TR, tssSel); 379 tc->setMiscReg(MISCREG_TR_BASE, tss_base_addr); 380 tc->setMiscReg(MISCREG_TR_EFF_BASE, 0); 381 tc->setMiscReg(MISCREG_TR_LIMIT, tss_limit); 382 tc->setMiscReg(MISCREG_TR_ATTR, tss_attr); 383 384 //Start using longmode segments. 385 installSegDesc(tc, SEGMENT_REG_CS, csDesc, true); 386 installSegDesc(tc, SEGMENT_REG_DS, dsDesc, true); 387 installSegDesc(tc, SEGMENT_REG_ES, dsDesc, true); 388 installSegDesc(tc, SEGMENT_REG_FS, dsDesc, true); 389 installSegDesc(tc, SEGMENT_REG_GS, dsDesc, true); 390 installSegDesc(tc, SEGMENT_REG_SS, dsDesc, true); 391 392 Efer efer = 0; 393 efer.sce = 1; // Enable system call extensions. 394 efer.lme = 1; // Enable long mode. 395 efer.lma = 1; // Activate long mode. 396 efer.nxe = 0; // Enable nx support. 397 efer.svme = 1; // Enable svm support for now. 398 efer.ffxsr = 0; // Turn on fast fxsave and fxrstor. 399 tc->setMiscReg(MISCREG_EFER, efer); 400 401 //Set up the registers that describe the operating mode. 402 CR0 cr0 = 0; 403 cr0.pg = 1; // Turn on paging. 404 cr0.cd = 0; // Don't disable caching. 405 cr0.nw = 0; // This is bit is defined to be ignored. 406 cr0.am = 1; // No alignment checking 407 cr0.wp = 1; // Supervisor mode can write read only pages 408 cr0.ne = 1; 409 cr0.et = 1; // This should always be 1 410 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 411 // would be pointless. 412 cr0.em = 0; // Allow x87 instructions to execute natively. 413 cr0.mp = 1; // This doesn't really matter, but the manual suggests 414 // setting it to one. 415 cr0.pe = 1; // We're definitely in protected mode. 416 tc->setMiscReg(MISCREG_CR0, cr0); 417 418 CR0 cr2 = 0; 419 tc->setMiscReg(MISCREG_CR2, cr2); 420 421 CR3 cr3 = dynamic_cast<ArchPageTable *>(pTable)->basePtr(); 422 tc->setMiscReg(MISCREG_CR3, cr3); 423 424 CR4 cr4 = 0; 425 //Turn on pae. 426 cr4.osxsave = 1; // Enable XSAVE and Proc Extended States 427 cr4.osxmmexcpt = 1; // Operating System Unmasked Exception 428 cr4.osfxsr = 1; // Operating System FXSave/FSRSTOR Support 429 cr4.pce = 0; // Performance-Monitoring Counter Enable 430 cr4.pge = 0; // Page-Global Enable 431 cr4.mce = 0; // Machine Check Enable 432 cr4.pae = 1; // Physical-Address Extension 433 cr4.pse = 0; // Page Size Extensions 434 cr4.de = 0; // Debugging Extensions 435 cr4.tsd = 0; // Time Stamp Disable 436 cr4.pvi = 0; // Protected-Mode Virtual Interrupts 437 cr4.vme = 0; // Virtual-8086 Mode Extensions 438 439 tc->setMiscReg(MISCREG_CR4, cr4); 440 441 CR4 cr8 = 0; 442 tc->setMiscReg(MISCREG_CR8, cr8); 443 444 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 445 446 tc->setMiscReg(MISCREG_APIC_BASE, 0xfee00900); 447 448 tc->setMiscReg(MISCREG_TSG_BASE, GDTVirtAddr); 449 tc->setMiscReg(MISCREG_TSG_LIMIT, 0xffff); 450 451 tc->setMiscReg(MISCREG_IDTR_BASE, IDTVirtAddr); 452 tc->setMiscReg(MISCREG_IDTR_LIMIT, 0xffff); 453 454 /* enabling syscall and sysret */ 455 MiscReg star = ((MiscReg)sret << 48) | ((MiscReg)scall << 32); 456 tc->setMiscReg(MISCREG_STAR, star); 457 MiscReg lstar = (MiscReg)syscallCodeVirtAddr; 458 tc->setMiscReg(MISCREG_LSTAR, lstar); 459 MiscReg sfmask = (1 << 8) | (1 << 10); // TF | DF 460 tc->setMiscReg(MISCREG_SF_MASK, sfmask); 461 } 462 463 /* Set up the content of the TSS and write it to physical memory. */ 464 465 struct { 466 uint32_t reserved0; // +00h 467 uint32_t RSP0_low; // +04h 468 uint32_t RSP0_high; // +08h 469 uint32_t RSP1_low; // +0Ch 470 uint32_t RSP1_high; // +10h 471 uint32_t RSP2_low; // +14h 472 uint32_t RSP2_high; // +18h 473 uint32_t reserved1; // +1Ch 474 uint32_t reserved2; // +20h 475 uint32_t IST1_low; // +24h 476 uint32_t IST1_high; // +28h 477 uint32_t IST2_low; // +2Ch 478 uint32_t IST2_high; // +30h 479 uint32_t IST3_low; // +34h 480 uint32_t IST3_high; // +38h 481 uint32_t IST4_low; // +3Ch 482 uint32_t IST4_high; // +40h 483 uint32_t IST5_low; // +44h 484 uint32_t IST5_high; // +48h 485 uint32_t IST6_low; // +4Ch 486 uint32_t IST6_high; // +50h 487 uint32_t IST7_low; // +54h 488 uint32_t IST7_high; // +58h 489 uint32_t reserved3; // +5Ch 490 uint32_t reserved4; // +60h 491 uint16_t reserved5; // +64h 492 uint16_t IO_MapBase; // +66h 493 } tss; 494 495 /** setting Interrupt Stack Table */ 496 uint64_t IST_start = ISTVirtAddr + PageBytes; 497 tss.IST1_low = IST_start; 498 tss.IST1_high = IST_start >> 32; 499 tss.RSP0_low = tss.IST1_low; 500 tss.RSP0_high = tss.IST1_high; 501 tss.RSP1_low = tss.IST1_low; 502 tss.RSP1_high = tss.IST1_high; 503 tss.RSP2_low = tss.IST1_low; 504 tss.RSP2_high = tss.IST1_high; 505 physProxy.writeBlob(tssPhysAddr, (uint8_t *)(&tss), sizeof(tss)); 506 507 /* Setting IDT gates */ 508 GateDescriptorLow PFGateLow = 0; 509 PFGateLow.offsetHigh = bits(PFHandlerVirtAddr, 31, 16); 510 PFGateLow.offsetLow = bits(PFHandlerVirtAddr, 15, 0); 511 PFGateLow.selector = csLowPL; 512 PFGateLow.p = 1; 513 PFGateLow.dpl = 0; 514 PFGateLow.type = 0xe; // gate interrupt type 515 PFGateLow.IST = 0; // setting IST to 0 and using RSP0 516 517 GateDescriptorHigh PFGateHigh = 0; 518 PFGateHigh.offset = bits(PFHandlerVirtAddr, 63, 32); 519 520 struct { 521 uint64_t low; 522 uint64_t high; 523 } PFGate = {PFGateLow, PFGateHigh}; 524 525 physProxy.writeBlob(idtPhysAddr + 0xE0, 526 (uint8_t *)(&PFGate), sizeof(PFGate)); 527 528 /* System call handler */ 529 uint8_t syscallBlob[] = { 530 // mov %rax, (0xffffc90000005600) 531 0x48, 0xa3, 0x00, 0x60, 0x00, 532 0x00, 0x00, 0xc9, 0xff, 0xff, 533 // sysret 534 0x48, 0x0f, 0x07 535 }; 536 537 physProxy.writeBlob(syscallCodePhysAddr, 538 syscallBlob, sizeof(syscallBlob)); 539 540 /** Page fault handler */ 541 uint8_t faultBlob[] = { 542 // mov %rax, (0xffffc90000005700) 543 0x48, 0xa3, 0x00, 0x61, 0x00, 544 0x00, 0x00, 0xc9, 0xff, 0xff, 545 // add $0x8, %rsp # skip error 546 0x48, 0x83, 0xc4, 0x08, 547 // iretq 548 0x48, 0xcf 549 }; 550 551 physProxy.writeBlob(pfHandlerPhysAddr, faultBlob, sizeof(faultBlob)); 552 553 /* Syscall handler */ 554 pTable->map(syscallCodeVirtAddr, syscallCodePhysAddr, 555 PageBytes, false); 556 /* GDT */ 557 pTable->map(GDTVirtAddr, gdtPhysAddr, PageBytes, false); 558 /* IDT */ 559 pTable->map(IDTVirtAddr, idtPhysAddr, PageBytes, false); 560 /* TSS */ 561 pTable->map(TSSVirtAddr, tssPhysAddr, PageBytes, false); 562 /* IST */ 563 pTable->map(ISTVirtAddr, istPhysAddr, PageBytes, false); 564 /* PF handler */ 565 pTable->map(PFHandlerVirtAddr, pfHandlerPhysAddr, PageBytes, false); 566 /* MMIO region for m5ops */ 567 pTable->map(MMIORegionVirtAddr, MMIORegionPhysAddr, 568 16 * PageBytes, false); 569 } else { 570 for (int i = 0; i < contextIds.size(); i++) { 571 ThreadContext * tc = system->getThreadContext(contextIds[i]); 572 573 SegAttr dataAttr = 0; 574 dataAttr.dpl = 3; 575 dataAttr.unusable = 0; 576 dataAttr.defaultSize = 1; 577 dataAttr.longMode = 1; 578 dataAttr.avl = 0; 579 dataAttr.granularity = 1; 580 dataAttr.present = 1; 581 dataAttr.type = 3; 582 dataAttr.writable = 1; 583 dataAttr.readable = 1; 584 dataAttr.expandDown = 0; 585 dataAttr.system = 1; 586 587 // Initialize the segment registers. 588 for (int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 589 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 590 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 591 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 592 } 593 594 SegAttr csAttr = 0; 595 csAttr.dpl = 3; 596 csAttr.unusable = 0; 597 csAttr.defaultSize = 0; 598 csAttr.longMode = 1; 599 csAttr.avl = 0; 600 csAttr.granularity = 1; 601 csAttr.present = 1; 602 csAttr.type = 10; 603 csAttr.writable = 0; 604 csAttr.readable = 1; 605 csAttr.expandDown = 0; 606 csAttr.system = 1; 607 608 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 609 610 Efer efer = 0; 611 efer.sce = 1; // Enable system call extensions. 612 efer.lme = 1; // Enable long mode. 613 efer.lma = 1; // Activate long mode. 614 efer.nxe = 1; // Enable nx support. 615 efer.svme = 0; // Disable svm support for now. It isn't implemented. 616 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 617 tc->setMiscReg(MISCREG_EFER, efer); 618 619 // Set up the registers that describe the operating mode. 620 CR0 cr0 = 0; 621 cr0.pg = 1; // Turn on paging. 622 cr0.cd = 0; // Don't disable caching. 623 cr0.nw = 0; // This is bit is defined to be ignored. 624 cr0.am = 0; // No alignment checking 625 cr0.wp = 0; // Supervisor mode can write read only pages 626 cr0.ne = 1; 627 cr0.et = 1; // This should always be 1 628 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 629 // would be pointless. 630 cr0.em = 0; // Allow x87 instructions to execute natively. 631 cr0.mp = 1; // This doesn't really matter, but the manual suggests 632 // setting it to one. 633 cr0.pe = 1; // We're definitely in protected mode. 634 tc->setMiscReg(MISCREG_CR0, cr0); 635 636 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 637 } 638 } 639} 640 641void 642I386Process::initState() 643{ 644 X86Process::initState(); 645 646 argsInit(PageBytes); 647 648 /* 649 * Set up a GDT for this process. The whole GDT wouldn't really be for 650 * this process, but the only parts we care about are. 651 */ 652 allocateMem(_gdtStart, _gdtSize); 653 uint64_t zero = 0; 654 assert(_gdtSize % sizeof(zero) == 0); 655 for (Addr gdtCurrent = _gdtStart; 656 gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) { 657 initVirtMem.write(gdtCurrent, zero); 658 } 659 660 // Set up the vsyscall page for this process. 661 allocateMem(vsyscallPage.base, vsyscallPage.size); 662 uint8_t vsyscallBlob[] = { 663 0x51, // push %ecx 664 0x52, // push %edp 665 0x55, // push %ebp 666 0x89, 0xe5, // mov %esp, %ebp 667 0x0f, 0x34 // sysenter 668 }; 669 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset, 670 vsyscallBlob, sizeof(vsyscallBlob)); 671 672 uint8_t vsysexitBlob[] = { 673 0x5d, // pop %ebp 674 0x5a, // pop %edx 675 0x59, // pop %ecx 676 0xc3 // ret 677 }; 678 initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset, 679 vsysexitBlob, sizeof(vsysexitBlob)); 680 681 for (int i = 0; i < contextIds.size(); i++) { 682 ThreadContext * tc = system->getThreadContext(contextIds[i]); 683 684 SegAttr dataAttr = 0; 685 dataAttr.dpl = 3; 686 dataAttr.unusable = 0; 687 dataAttr.defaultSize = 1; 688 dataAttr.longMode = 0; 689 dataAttr.avl = 0; 690 dataAttr.granularity = 1; 691 dataAttr.present = 1; 692 dataAttr.type = 3; 693 dataAttr.writable = 1; 694 dataAttr.readable = 1; 695 dataAttr.expandDown = 0; 696 dataAttr.system = 1; 697 698 // Initialize the segment registers. 699 for (int seg = 0; seg < NUM_SEGMENTREGS; seg++) { 700 tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0); 701 tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0); 702 tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr); 703 tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB); 704 tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1)); 705 } 706 707 SegAttr csAttr = 0; 708 csAttr.dpl = 3; 709 csAttr.unusable = 0; 710 csAttr.defaultSize = 1; 711 csAttr.longMode = 0; 712 csAttr.avl = 0; 713 csAttr.granularity = 1; 714 csAttr.present = 1; 715 csAttr.type = 0xa; 716 csAttr.writable = 0; 717 csAttr.readable = 1; 718 csAttr.expandDown = 0; 719 csAttr.system = 1; 720 721 tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr); 722 723 tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart); 724 tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart); 725 tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1); 726 727 // Set the LDT selector to 0 to deactivate it. 728 tc->setMiscRegNoEffect(MISCREG_TSL, 0); 729 730 Efer efer = 0; 731 efer.sce = 1; // Enable system call extensions. 732 efer.lme = 1; // Enable long mode. 733 efer.lma = 0; // Deactivate long mode. 734 efer.nxe = 1; // Enable nx support. 735 efer.svme = 0; // Disable svm support for now. It isn't implemented. 736 efer.ffxsr = 1; // Turn on fast fxsave and fxrstor. 737 tc->setMiscReg(MISCREG_EFER, efer); 738 739 // Set up the registers that describe the operating mode. 740 CR0 cr0 = 0; 741 cr0.pg = 1; // Turn on paging. 742 cr0.cd = 0; // Don't disable caching. 743 cr0.nw = 0; // This is bit is defined to be ignored. 744 cr0.am = 0; // No alignment checking 745 cr0.wp = 0; // Supervisor mode can write read only pages 746 cr0.ne = 1; 747 cr0.et = 1; // This should always be 1 748 cr0.ts = 0; // We don't do task switching, so causing fp exceptions 749 // would be pointless. 750 cr0.em = 0; // Allow x87 instructions to execute natively. 751 cr0.mp = 1; // This doesn't really matter, but the manual suggests 752 // setting it to one. 753 cr0.pe = 1; // We're definitely in protected mode. 754 tc->setMiscReg(MISCREG_CR0, cr0); 755 756 tc->setMiscReg(MISCREG_MXCSR, 0x1f80); 757 } 758} 759 760template<class IntType> 761void 762X86Process::argsInit(int pageSize, 763 std::vector<AuxVector<IntType> > extraAuxvs) 764{ 765 int intSize = sizeof(IntType); 766 767 typedef AuxVector<IntType> auxv_t; 768 std::vector<auxv_t> auxv = extraAuxvs; 769 770 string filename; 771 if (argv.size() < 1) 772 filename = ""; 773 else 774 filename = argv[0]; 775 776 // We want 16 byte alignment 777 uint64_t align = 16; 778 779 // Patch the ld_bias for dynamic executables. 780 updateBias(); 781 782 // load object file into target memory 783 objFile->loadSections(initVirtMem); 784 785 enum X86CpuFeature { 786 X86_OnboardFPU = 1 << 0, 787 X86_VirtualModeExtensions = 1 << 1, 788 X86_DebuggingExtensions = 1 << 2, 789 X86_PageSizeExtensions = 1 << 3, 790 791 X86_TimeStampCounter = 1 << 4, 792 X86_ModelSpecificRegisters = 1 << 5, 793 X86_PhysicalAddressExtensions = 1 << 6, 794 X86_MachineCheckExtensions = 1 << 7, 795 796 X86_CMPXCHG8Instruction = 1 << 8, 797 X86_OnboardAPIC = 1 << 9, 798 X86_SYSENTER_SYSEXIT = 1 << 11, 799 800 X86_MemoryTypeRangeRegisters = 1 << 12, 801 X86_PageGlobalEnable = 1 << 13, 802 X86_MachineCheckArchitecture = 1 << 14, 803 X86_CMOVInstruction = 1 << 15, 804 805 X86_PageAttributeTable = 1 << 16, 806 X86_36BitPSEs = 1 << 17, 807 X86_ProcessorSerialNumber = 1 << 18, 808 X86_CLFLUSHInstruction = 1 << 19, 809 810 X86_DebugTraceStore = 1 << 21, 811 X86_ACPIViaMSR = 1 << 22, 812 X86_MultimediaExtensions = 1 << 23, 813 814 X86_FXSAVE_FXRSTOR = 1 << 24, 815 X86_StreamingSIMDExtensions = 1 << 25, 816 X86_StreamingSIMDExtensions2 = 1 << 26, 817 X86_CPUSelfSnoop = 1 << 27, 818 819 X86_HyperThreading = 1 << 28, 820 X86_AutomaticClockControl = 1 << 29, 821 X86_IA64Processor = 1 << 30 822 }; 823 824 // Setup the auxiliary vectors. These will already have endian 825 // conversion. Auxiliary vectors are loaded only for elf formatted 826 // executables; the auxv is responsible for passing information from 827 // the OS to the interpreter. 828 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 829 if (elfObject) { 830 uint64_t features = 831 X86_OnboardFPU | 832 X86_VirtualModeExtensions | 833 X86_DebuggingExtensions | 834 X86_PageSizeExtensions | 835 X86_TimeStampCounter | 836 X86_ModelSpecificRegisters | 837 X86_PhysicalAddressExtensions | 838 X86_MachineCheckExtensions | 839 X86_CMPXCHG8Instruction | 840 X86_OnboardAPIC | 841 X86_SYSENTER_SYSEXIT | 842 X86_MemoryTypeRangeRegisters | 843 X86_PageGlobalEnable | 844 X86_MachineCheckArchitecture | 845 X86_CMOVInstruction | 846 X86_PageAttributeTable | 847 X86_36BitPSEs | 848// X86_ProcessorSerialNumber | 849 X86_CLFLUSHInstruction | 850// X86_DebugTraceStore | 851// X86_ACPIViaMSR | 852 X86_MultimediaExtensions | 853 X86_FXSAVE_FXRSTOR | 854 X86_StreamingSIMDExtensions | 855 X86_StreamingSIMDExtensions2 | 856// X86_CPUSelfSnoop | 857// X86_HyperThreading | 858// X86_AutomaticClockControl | 859// X86_IA64Processor | 860 0; 861 862 // Bits which describe the system hardware capabilities 863 // XXX Figure out what these should be 864 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 865 // The system page size 866 auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::PageBytes)); 867 // Frequency at which times() increments 868 // Defined to be 100 in the kernel source. 869 auxv.push_back(auxv_t(M5_AT_CLKTCK, 100)); 870 // This is the virtual address of the program header tables if they 871 // appear in the executable image. 872 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 873 // This is the size of a program header entry from the elf file. 874 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 875 // This is the number of program headers from the original elf file. 876 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 877 // This is the base address of the ELF interpreter; it should be 878 // zero for static executables or contain the base address for 879 // dynamic executables. 880 auxv.push_back(auxv_t(M5_AT_BASE, getBias())); 881 // XXX Figure out what this should be. 882 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 883 // The entry point to the program 884 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 885 // Different user and group IDs 886 auxv.push_back(auxv_t(M5_AT_UID, uid())); 887 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 888 auxv.push_back(auxv_t(M5_AT_GID, gid())); 889 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 890 // Whether to enable "secure mode" in the executable 891 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 892 // The address of 16 "random" bytes. 893 auxv.push_back(auxv_t(M5_AT_RANDOM, 0)); 894 // The name of the program 895 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 896 // The platform string 897 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 898 } 899 900 // Figure out how big the initial stack needs to be 901 902 // A sentry NULL void pointer at the top of the stack. 903 int sentry_size = intSize; 904 905 // This is the name of the file which is present on the initial stack 906 // It's purpose is to let the user space linker examine the original file. 907 int file_name_size = filename.size() + 1; 908 909 const int numRandomBytes = 16; 910 int aux_data_size = numRandomBytes; 911 912 string platform = "x86_64"; 913 aux_data_size += platform.size() + 1; 914 915 int env_data_size = 0; 916 for (int i = 0; i < envp.size(); ++i) 917 env_data_size += envp[i].size() + 1; 918 int arg_data_size = 0; 919 for (int i = 0; i < argv.size(); ++i) 920 arg_data_size += argv[i].size() + 1; 921 922 // The info_block needs to be padded so its size is a multiple of the 923 // alignment mask. Also, it appears that there needs to be at least some 924 // padding, so if the size is already a multiple, we need to increase it 925 // anyway. 926 int base_info_block_size = 927 sentry_size + file_name_size + env_data_size + arg_data_size; 928 929 int info_block_size = roundUp(base_info_block_size, align); 930 931 int info_block_padding = info_block_size - base_info_block_size; 932 933 // Each auxiliary vector is two 8 byte words 934 int aux_array_size = intSize * 2 * (auxv.size() + 1); 935 936 int envp_array_size = intSize * (envp.size() + 1); 937 int argv_array_size = intSize * (argv.size() + 1); 938 939 int argc_size = intSize; 940 941 // Figure out the size of the contents of the actual initial frame 942 int frame_size = 943 aux_array_size + 944 envp_array_size + 945 argv_array_size + 946 argc_size; 947 948 // There needs to be padding after the auxiliary vector data so that the 949 // very bottom of the stack is aligned properly. 950 int partial_size = frame_size + aux_data_size; 951 int aligned_partial_size = roundUp(partial_size, align); 952 int aux_padding = aligned_partial_size - partial_size; 953 954 int space_needed = 955 info_block_size + 956 aux_data_size + 957 aux_padding + 958 frame_size; 959 960 Addr stack_base = memState->getStackBase(); 961 962 Addr stack_min = stack_base - space_needed; 963 stack_min = roundDown(stack_min, align); 964 965 unsigned stack_size = stack_base - stack_min; 966 stack_size = roundUp(stack_size, pageSize); 967 memState->setStackSize(stack_size); 968 969 // map memory 970 Addr stack_end = roundDown(stack_base - stack_size, pageSize); 971 972 DPRINTF(Stack, "Mapping the stack: 0x%x %dB\n", stack_end, stack_size); 973 allocateMem(stack_end, stack_size); 974 975 // map out initial stack contents 976 IntType sentry_base = stack_base - sentry_size; 977 IntType file_name_base = sentry_base - file_name_size; 978 IntType env_data_base = file_name_base - env_data_size; 979 IntType arg_data_base = env_data_base - arg_data_size; 980 IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size; 981 IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding; 982 IntType envp_array_base = auxv_array_base - envp_array_size; 983 IntType argv_array_base = envp_array_base - argv_array_size; 984 IntType argc_base = argv_array_base - argc_size; 985 986 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 987 DPRINTF(Stack, "0x%x - file name\n", file_name_base); 988 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 989 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 990 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 991 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 992 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 993 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 994 DPRINTF(Stack, "0x%x - argc \n", argc_base); 995 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 996 997 // write contents to stack 998 999 // figure out argc 1000 IntType argc = argv.size(); 1001 IntType guestArgc = X86ISA::htog(argc); 1002 1003 // Write out the sentry void * 1004 IntType sentry_NULL = 0; 1005 initVirtMem.writeBlob(sentry_base, (uint8_t*)&sentry_NULL, sentry_size); 1006 1007 // Write the file name 1008 initVirtMem.writeString(file_name_base, filename.c_str()); 1009 1010 // Fix up the aux vectors which point to data 1011 assert(auxv[auxv.size() - 3].a_type == M5_AT_RANDOM); 1012 auxv[auxv.size() - 3].a_val = aux_data_base; 1013 assert(auxv[auxv.size() - 2].a_type == M5_AT_EXECFN); 1014 auxv[auxv.size() - 2].a_val = argv_array_base; 1015 assert(auxv[auxv.size() - 1].a_type == M5_AT_PLATFORM); 1016 auxv[auxv.size() - 1].a_val = aux_data_base + numRandomBytes; 1017 1018 1019 // Copy the aux stuff 1020 for (int x = 0; x < auxv.size(); x++) { 1021 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 1022 (uint8_t*)&(auxv[x].a_type), intSize); 1023 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 1024 (uint8_t*)&(auxv[x].a_val), intSize); 1025 } 1026 // Write out the terminating zeroed auxiliary vector 1027 const uint64_t zero = 0; 1028 initVirtMem.writeBlob(auxv_array_base + auxv.size() * 2 * intSize, 1029 (uint8_t*)&zero, intSize); 1030 initVirtMem.writeBlob(auxv_array_base + (auxv.size() * 2 + 1) * intSize, 1031 (uint8_t*)&zero, intSize); 1032 1033 initVirtMem.writeString(aux_data_base, platform.c_str()); 1034 1035 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 1036 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 1037 1038 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 1039 1040 ThreadContext *tc = system->getThreadContext(contextIds[0]); 1041 // Set the stack pointer register 1042 tc->setIntReg(StackPointerReg, stack_min); 1043 1044 // There doesn't need to be any segment base added in since we're dealing 1045 // with the flat segmentation model. 1046 tc->pcState(getStartPC()); 1047 1048 // Align the "stack_min" to a page boundary. 1049 memState->setStackMin(roundDown(stack_min, pageSize)); 1050} 1051 1052void 1053X86_64Process::argsInit(int pageSize) 1054{ 1055 std::vector<AuxVector<uint64_t> > extraAuxvs; 1056 extraAuxvs.push_back(AuxVector<uint64_t>(M5_AT_SYSINFO_EHDR, 1057 vsyscallPage.base)); 1058 X86Process::argsInit<uint64_t>(pageSize, extraAuxvs); 1059} 1060 1061void 1062I386Process::argsInit(int pageSize) 1063{ 1064 std::vector<AuxVector<uint32_t> > extraAuxvs; 1065 //Tell the binary where the vsyscall part of the vsyscall page is. 1066 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO, 1067 vsyscallPage.base + vsyscallPage.vsyscallOffset)); 1068 extraAuxvs.push_back(AuxVector<uint32_t>(M5_AT_SYSINFO_EHDR, 1069 vsyscallPage.base)); 1070 X86Process::argsInit<uint32_t>(pageSize, extraAuxvs); 1071} 1072 1073void 1074X86Process::setSyscallReturn(ThreadContext *tc, SyscallReturn retval) 1075{ 1076 tc->setIntReg(INTREG_RAX, retval.encodedValue()); 1077} 1078 1079X86ISA::IntReg 1080X86_64Process::getSyscallArg(ThreadContext *tc, int &i) 1081{ 1082 assert(i < NumArgumentRegs); 1083 return tc->readIntReg(ArgumentReg[i++]); 1084} 1085 1086void 1087X86_64Process::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 1088{ 1089 assert(i < NumArgumentRegs); 1090 return tc->setIntReg(ArgumentReg[i], val); 1091} 1092 1093void 1094X86_64Process::clone(ThreadContext *old_tc, ThreadContext *new_tc, 1095 Process *p, TheISA::IntReg flags) 1096{ 1097 X86Process::clone(old_tc, new_tc, p, flags); 1098 ((X86_64Process*)p)->vsyscallPage = vsyscallPage; 1099} 1100 1101X86ISA::IntReg 1102I386Process::getSyscallArg(ThreadContext *tc, int &i) 1103{ 1104 assert(i < NumArgumentRegs32); 1105 return tc->readIntReg(ArgumentReg32[i++]); 1106} 1107 1108X86ISA::IntReg 1109I386Process::getSyscallArg(ThreadContext *tc, int &i, int width) 1110{ 1111 assert(width == 32 || width == 64); 1112 assert(i < NumArgumentRegs); 1113 uint64_t retVal = tc->readIntReg(ArgumentReg32[i++]) & mask(32); 1114 if (width == 64) 1115 retVal |= ((uint64_t)tc->readIntReg(ArgumentReg[i++]) << 32); 1116 return retVal; 1117} 1118 1119void 1120I386Process::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val) 1121{ 1122 assert(i < NumArgumentRegs); 1123 return tc->setIntReg(ArgumentReg[i], val); 1124} 1125 1126void 1127I386Process::clone(ThreadContext *old_tc, ThreadContext *new_tc, 1128 Process *p, TheISA::IntReg flags) 1129{ 1130 X86Process::clone(old_tc, new_tc, p, flags); 1131 ((I386Process*)p)->vsyscallPage = vsyscallPage; 1132} 1133