src/arch/x86/process.cc

   1 /*
   2  * Copyright (c) 2003-2006 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Gabe Black
  29  *          Ali Saidi
  30  */
  31
  32 /*
  33  * Copyright (c) 2007 The Hewlett-Packard Development Company
  34  * All rights reserved.
  35  *
  36  * Redistribution and use of this software in source and binary forms,
  37  * with or without modification, are permitted provided that the
  38  * following conditions are met:
  39  *
  40  * The software must be used only for Non-Commercial Use which means any
  41  * use which is NOT directed to receiving any direct monetary
  42  * compensation for, or commercial advantage from such use.  Illustrative
  43  * examples of non-commercial use are academic research, personal study,
  44  * teaching, education and corporate research & development.
  45  * Illustrative examples of commercial use are distributing products for
  46  * commercial advantage and providing services using the software for
  47  * commercial advantage.
  48  *
  49  * If you wish to use this software or functionality therein that may be
  50  * covered by patents for commercial use, please contact:
  51  *     Director of Intellectual Property Licensing
  52  *     Office of Strategy and Technology
  53  *     Hewlett-Packard Company
  54  *     1501 Page Mill Road
  55  *     Palo Alto, California  94304
  56  *
  57  * Redistributions of source code must retain the above copyright notice,
  58  * this list of conditions and the following disclaimer.  Redistributions
  59  * in binary form must reproduce the above copyright notice, this list of
  60  * conditions and the following disclaimer in the documentation and/or
  61  * other materials provided with the distribution.  Neither the name of
  62  * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
  63  * contributors may be used to endorse or promote products derived from
  64  * this software without specific prior written permission.  No right of
  65  * sublicense is granted herewith.  Derivatives of the software and
  66  * output created using the software may be prepared, but only for
  67  * Non-Commercial Uses.  Derivatives of the software may be shared with
  68  * others provided: (i) the others agree to abide by the list of
  69  * conditions herein which includes the Non-Commercial Use restrictions;
  70  * and (ii) such Derivatives of the software include the above copyright
  71  * notice to acknowledge the contribution from this software where
  72  * applicable, this list of conditions and the disclaimer below.
  73  *
  74  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  75  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  76  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  77  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  78  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  79  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  80  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  81  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  82  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  83  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  84  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  85  *
  86  * Authors: Gabe Black
  87  */
  88
  89 #include "arch/x86/isa_traits.hh"
  90 #include "arch/x86/miscregs.hh"
  91 #include "arch/x86/process.hh"
  92 #include "arch/x86/segmentregs.hh"
  93 #include "arch/x86/types.hh"
  94 #include "base/loader/object_file.hh"
  95 #include "base/loader/elf_object.hh"
  96 #include "base/misc.hh"
  97 #include "base/trace.hh"
  98 #include "cpu/thread_context.hh"
  99 #include "mem/page_table.hh"
 100 #include "mem/translating_port.hh"
 101 #include "sim/process_impl.hh"
 102 #include "sim/syscall_emul.hh"
 103 #include "sim/system.hh"
 104
 105 using namespace std;
 106 using namespace X86ISA;
 107
 108 static const int ArgumentReg[] = {
 109     INTREG_RDI,
 110     INTREG_RSI,
 111     INTREG_RDX,
 112     //This argument register is r10 for syscalls and rcx for C.
 113     INTREG_R10W,
 114     //INTREG_RCX,
 115     INTREG_R8W,
 116     INTREG_R9W
 117 };
 118 static const int NumArgumentRegs = sizeof(ArgumentReg) / sizeof(const int);
 119 static const int ArgumentReg32[] = {
 120     INTREG_EBX,
 121     INTREG_ECX,
 122     INTREG_EDX,
 123     INTREG_ESI,
 124     INTREG_EDI,
 125 };
 126 static const int NumArgumentRegs32 = sizeof(ArgumentReg) / sizeof(const int);
 127
 128 X86LiveProcess::X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile,
 129         SyscallDesc *_syscallDescs, int _numSyscallDescs) :
 130     LiveProcess(params, objFile), syscallDescs(_syscallDescs),
 131     numSyscallDescs(_numSyscallDescs)
 132 {
 133     brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
 134     brk_point = roundUp(brk_point, VMPageSize);
 135 }
 136
 137 X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params,
 138         ObjectFile *objFile, SyscallDesc *_syscallDescs,
 139         int _numSyscallDescs) :
 140     X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs)
 141 {
 142
 143     vsyscallPage.base = 0xffffffffff600000ULL;
 144     vsyscallPage.size = VMPageSize;
 145     vsyscallPage.vtimeOffset = 0x400;
 146     vsyscallPage.vgettimeofdayOffset = 0x410;
 147
 148     // Set up stack. On X86_64 Linux, stack goes from the top of memory
 149     // downward, less the hole for the kernel address space plus one page
 150     // for undertermined purposes.
 151     stack_base = (Addr)0x7FFFFFFFF000ULL;
 152
 153     // Set pointer for next thread stack.  Reserve 8M for main stack.
 154     next_thread_stack_base = stack_base - (8 * 1024 * 1024);
 155
 156     // Set up region for mmaps. This was determined empirically and may not
 157     // always be correct.
 158     mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL;
 159 }
 160
 161 void
 162 I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc)
 163 {
 164     Addr eip = tc->readPC();
 165     if (eip >= vsyscallPage.base &&
 166             eip < vsyscallPage.base + vsyscallPage.size) {
 167         tc->setNextPC(vsyscallPage.base + vsyscallPage.vsysexitOffset);
 168     }
 169     X86LiveProcess::syscall(callnum, tc);
 170 }
 171
 172
 173 I386LiveProcess::I386LiveProcess(LiveProcessParams *params,
 174         ObjectFile *objFile, SyscallDesc *_syscallDescs,
 175         int _numSyscallDescs) :
 176     X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs)
 177 {
 178     _gdtStart = ULL(0x100000000);
 179     _gdtSize = VMPageSize;
 180
 181     vsyscallPage.base = 0xffffe000ULL;
 182     vsyscallPage.size = VMPageSize;
 183     vsyscallPage.vsyscallOffset = 0x400;
 184     vsyscallPage.vsysexitOffset = 0x410;
 185
 186     stack_base = vsyscallPage.base;
 187
 188     // Set pointer for next thread stack.  Reserve 8M for main stack.
 189     next_thread_stack_base = stack_base - (8 * 1024 * 1024);
 190
 191     // Set up region for mmaps. This was determined empirically and may not
 192     // always be correct.
 193     mmap_start = mmap_end = (Addr)0xf7ffe000ULL;
 194 }
 195
 196 SyscallDesc*
 197 X86LiveProcess::getDesc(int callnum)
 198 {
 199     if (callnum < 0 || callnum >= numSyscallDescs)
 200         return NULL;
 201     return &syscallDescs[callnum];
 202 }
 203
 204 void
 205 X86_64LiveProcess::startup()
 206 {
 207     LiveProcess::startup();
 208
 209     if (checkpointRestored)
 210         return;
 211
 212     argsInit(sizeof(uint64_t), VMPageSize);
 213
 214        // Set up the vsyscall page for this process.
 215     pTable->allocate(vsyscallPage.base, vsyscallPage.size);
 216     uint8_t vtimeBlob[] = {
 217         0x48,0xc7,0xc0,0xc9,0x00,0x00,0x00,    // mov    $0xc9,%rax
 218         0x0f,0x05,                             // syscall
 219         0xc3                                   // retq
 220     };
 221     initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vtimeOffset,
 222             vtimeBlob, sizeof(vtimeBlob));
 223
 224     uint8_t vgettimeofdayBlob[] = {
 225         0x48,0xc7,0xc0,0x60,0x00,0x00,0x00,    // mov    $0x60,%rax
 226         0x0f,0x05,                             // syscall
 227         0xc3                                   // retq
 228     };
 229     initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vgettimeofdayOffset,
 230             vgettimeofdayBlob, sizeof(vgettimeofdayBlob));
 231
 232     for (int i = 0; i < contextIds.size(); i++) {
 233         ThreadContext * tc = system->getThreadContext(contextIds[i]);
 234
 235         SegAttr dataAttr = 0;
 236         dataAttr.dpl = 3;
 237         dataAttr.unusable = 0;
 238         dataAttr.defaultSize = 1;
 239         dataAttr.longMode = 1;
 240         dataAttr.avl = 0;
 241         dataAttr.granularity = 1;
 242         dataAttr.present = 1;
 243         dataAttr.type = 3;
 244         dataAttr.writable = 1;
 245         dataAttr.readable = 1;
 246         dataAttr.expandDown = 0;
 247         dataAttr.system = 1;
 248
 249         //Initialize the segment registers.
 250         for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) {
 251             tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0);
 252             tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0);
 253             tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr);
 254         }
 255
 256         SegAttr csAttr = 0;
 257         csAttr.dpl = 3;
 258         csAttr.unusable = 0;
 259         csAttr.defaultSize = 0;
 260         csAttr.longMode = 1;
 261         csAttr.avl = 0;
 262         csAttr.granularity = 1;
 263         csAttr.present = 1;
 264         csAttr.type = 10;
 265         csAttr.writable = 0;
 266         csAttr.readable = 1;
 267         csAttr.expandDown = 0;
 268         csAttr.system = 1;
 269
 270         tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr);
 271
 272         Efer efer = 0;
 273         efer.sce = 1; // Enable system call extensions.
 274         efer.lme = 1; // Enable long mode.
 275         efer.lma = 1; // Activate long mode.
 276         efer.nxe = 1; // Enable nx support.
 277         efer.svme = 0; // Disable svm support for now. It isn't implemented.
 278         efer.ffxsr = 1; // Turn on fast fxsave and fxrstor.
 279         tc->setMiscReg(MISCREG_EFER, efer);
 280
 281         //Set up the registers that describe the operating mode.
 282         CR0 cr0 = 0;
 283         cr0.pg = 1; // Turn on paging.
 284         cr0.cd = 0; // Don't disable caching.
 285         cr0.nw = 0; // This is bit is defined to be ignored.
 286         cr0.am = 0; // No alignment checking
 287         cr0.wp = 0; // Supervisor mode can write read only pages
 288         cr0.ne = 1;
 289         cr0.et = 1; // This should always be 1
 290         cr0.ts = 0; // We don't do task switching, so causing fp exceptions
 291                     // would be pointless.
 292         cr0.em = 0; // Allow x87 instructions to execute natively.
 293         cr0.mp = 1; // This doesn't really matter, but the manual suggests
 294                     // setting it to one.
 295         cr0.pe = 1; // We're definitely in protected mode.
 296         tc->setMiscReg(MISCREG_CR0, cr0);
 297
 298         tc->setMiscReg(MISCREG_MXCSR, 0x1f80);
 299     }
 300 }
 301
 302 void
 303 I386LiveProcess::startup()
 304 {
 305     LiveProcess::startup();
 306
 307     if (checkpointRestored)
 308         return;
 309
 310     argsInit(sizeof(uint32_t), VMPageSize);
 311
 312     /*
 313      * Set up a GDT for this process. The whole GDT wouldn't really be for
 314      * this process, but the only parts we care about are.
 315      */
 316     pTable->allocate(_gdtStart, _gdtSize);
 317     uint64_t zero = 0;
 318     assert(_gdtSize % sizeof(zero) == 0);
 319     for (Addr gdtCurrent = _gdtStart;
 320             gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) {
 321         initVirtMem->write(gdtCurrent, zero);
 322     }
 323
 324     // Set up the vsyscall page for this process.
 325     pTable->allocate(vsyscallPage.base, vsyscallPage.size);
 326     uint8_t vsyscallBlob[] = {
 327         0x51,       // push %ecx
 328         0x52,       // push %edp
 329         0x55,       // push %ebp
 330         0x89, 0xe5, // mov %esp, %ebp
 331         0x0f, 0x34  // sysenter
 332     };
 333     initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset,
 334             vsyscallBlob, sizeof(vsyscallBlob));
 335
 336     uint8_t vsysexitBlob[] = {
 337         0x5d,       // pop %ebp
 338         0x5a,       // pop %edx
 339         0x59,       // pop %ecx
 340         0xc3        // ret
 341     };
 342     initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset,
 343             vsysexitBlob, sizeof(vsysexitBlob));
 344
 345     for (int i = 0; i < contextIds.size(); i++) {
 346         ThreadContext * tc = system->getThreadContext(contextIds[i]);
 347
 348         SegAttr dataAttr = 0;
 349         dataAttr.dpl = 3;
 350         dataAttr.unusable = 0;
 351         dataAttr.defaultSize = 1;
 352         dataAttr.longMode = 0;
 353         dataAttr.avl = 0;
 354         dataAttr.granularity = 1;
 355         dataAttr.present = 1;
 356         dataAttr.type = 3;
 357         dataAttr.writable = 1;
 358         dataAttr.readable = 1;
 359         dataAttr.expandDown = 0;
 360         dataAttr.system = 1;
 361
 362         //Initialize the segment registers.
 363         for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) {
 364             tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0);
 365             tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0);
 366             tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr);
 367             tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB);
 368             tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1));
 369         }
 370
 371         SegAttr csAttr = 0;
 372         csAttr.dpl = 3;
 373         csAttr.unusable = 0;
 374         csAttr.defaultSize = 1;
 375         csAttr.longMode = 0;
 376         csAttr.avl = 0;
 377         csAttr.granularity = 1;
 378         csAttr.present = 1;
 379         csAttr.type = 0xa;
 380         csAttr.writable = 0;
 381         csAttr.readable = 1;
 382         csAttr.expandDown = 0;
 383         csAttr.system = 1;
 384
 385         tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr);
 386
 387         tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart);
 388         tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart);
 389         tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1);
 390
 391         // Set the LDT selector to 0 to deactivate it.
 392         tc->setMiscRegNoEffect(MISCREG_TSL, 0);
 393
 394         Efer efer = 0;
 395         efer.sce = 1; // Enable system call extensions.
 396         efer.lme = 1; // Enable long mode.
 397         efer.lma = 0; // Deactivate long mode.
 398         efer.nxe = 1; // Enable nx support.
 399         efer.svme = 0; // Disable svm support for now. It isn't implemented.
 400         efer.ffxsr = 1; // Turn on fast fxsave and fxrstor.
 401         tc->setMiscReg(MISCREG_EFER, efer);
 402
 403         //Set up the registers that describe the operating mode.
 404         CR0 cr0 = 0;
 405         cr0.pg = 1; // Turn on paging.
 406         cr0.cd = 0; // Don't disable caching.
 407         cr0.nw = 0; // This is bit is defined to be ignored.
 408         cr0.am = 0; // No alignment checking
 409         cr0.wp = 0; // Supervisor mode can write read only pages
 410         cr0.ne = 1;
 411         cr0.et = 1; // This should always be 1
 412         cr0.ts = 0; // We don't do task switching, so causing fp exceptions
 413                     // would be pointless.
 414         cr0.em = 0; // Allow x87 instructions to execute natively.
 415         cr0.mp = 1; // This doesn't really matter, but the manual suggests
 416                     // setting it to one.
 417         cr0.pe = 1; // We're definitely in protected mode.
 418         tc->setMiscReg(MISCREG_CR0, cr0);
 419
 420         tc->setMiscReg(MISCREG_MXCSR, 0x1f80);
 421     }
 422 }
 423
 424 template<class IntType>
 425 void
 426 X86LiveProcess::argsInit(int pageSize,
 427         std::vector<AuxVector<IntType> > extraAuxvs)
 428 {
 429     int intSize = sizeof(IntType);
 430
 431     typedef AuxVector<IntType> auxv_t;
 432     std::vector<auxv_t> auxv = extraAuxvs;
 433
 434     string filename;
 435     if(argv.size() < 1)
 436         filename = "";
 437     else
 438         filename = argv[0];
 439
 440     //We want 16 byte alignment
 441     uint64_t align = 16;
 442
 443     // load object file into target memory
 444     objFile->loadSections(initVirtMem);
 445
 446     enum X86CpuFeature {
 447         X86_OnboardFPU = 1 << 0,
 448         X86_VirtualModeExtensions = 1 << 1,
 449         X86_DebuggingExtensions = 1 << 2,
 450         X86_PageSizeExtensions = 1 << 3,
 451
 452         X86_TimeStampCounter = 1 << 4,
 453         X86_ModelSpecificRegisters = 1 << 5,
 454         X86_PhysicalAddressExtensions = 1 << 6,
 455         X86_MachineCheckExtensions = 1 << 7,
 456
 457         X86_CMPXCHG8Instruction = 1 << 8,
 458         X86_OnboardAPIC = 1 << 9,
 459         X86_SYSENTER_SYSEXIT = 1 << 11,
 460
 461         X86_MemoryTypeRangeRegisters = 1 << 12,
 462         X86_PageGlobalEnable = 1 << 13,
 463         X86_MachineCheckArchitecture = 1 << 14,
 464         X86_CMOVInstruction = 1 << 15,
 465
 466         X86_PageAttributeTable = 1 << 16,
 467         X86_36BitPSEs = 1 << 17,
 468         X86_ProcessorSerialNumber = 1 << 18,
 469         X86_CLFLUSHInstruction = 1 << 19,
 470
 471         X86_DebugTraceStore = 1 << 21,
 472         X86_ACPIViaMSR = 1 << 22,
 473         X86_MultimediaExtensions = 1 << 23,
 474
 475         X86_FXSAVE_FXRSTOR = 1 << 24,
 476         X86_StreamingSIMDExtensions = 1 << 25,
 477         X86_StreamingSIMDExtensions2 = 1 << 26,
 478         X86_CPUSelfSnoop = 1 << 27,
 479
 480         X86_HyperThreading = 1 << 28,
 481         X86_AutomaticClockControl = 1 << 29,
 482         X86_IA64Processor = 1 << 30
 483     };
 484
 485     //Setup the auxilliary vectors. These will already have endian conversion.
 486     //Auxilliary vectors are loaded only for elf formatted executables.
 487     ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
 488     if(elfObject)
 489     {
 490         uint64_t features =
 491             X86_OnboardFPU |
 492             X86_VirtualModeExtensions |
 493             X86_DebuggingExtensions |
 494             X86_PageSizeExtensions |
 495             X86_TimeStampCounter |
 496             X86_ModelSpecificRegisters |
 497             X86_PhysicalAddressExtensions |
 498             X86_MachineCheckExtensions |
 499             X86_CMPXCHG8Instruction |
 500             X86_OnboardAPIC |
 501             X86_SYSENTER_SYSEXIT |
 502             X86_MemoryTypeRangeRegisters |
 503             X86_PageGlobalEnable |
 504             X86_MachineCheckArchitecture |
 505             X86_CMOVInstruction |
 506             X86_PageAttributeTable |
 507             X86_36BitPSEs |
 508 //            X86_ProcessorSerialNumber |
 509             X86_CLFLUSHInstruction |
 510 //            X86_DebugTraceStore |
 511 //            X86_ACPIViaMSR |
 512             X86_MultimediaExtensions |
 513             X86_FXSAVE_FXRSTOR |
 514             X86_StreamingSIMDExtensions |
 515             X86_StreamingSIMDExtensions2 |
 516 //            X86_CPUSelfSnoop |
 517 //            X86_HyperThreading |
 518 //            X86_AutomaticClockControl |
 519 //            X86_IA64Processor |
 520             0;
 521
 522         //Bits which describe the system hardware capabilities
 523         //XXX Figure out what these should be
 524         auxv.push_back(auxv_t(M5_AT_HWCAP, features));
 525         //The system page size
 526         auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize));
 527         //Frequency at which times() increments
 528         //Defined to be 100 in the kernel source.
 529         auxv.push_back(auxv_t(M5_AT_CLKTCK, 100));
 530         // For statically linked executables, this is the virtual address of the
 531         // program header tables if they appear in the executable image
 532         auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
 533         // This is the size of a program header entry from the elf file.
 534         auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize()));
 535         // This is the number of program headers from the original elf file.
 536         auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
 537         //This is the address of the elf "interpreter", It should be set
 538         //to 0 for regular executables. It should be something else
 539         //(not sure what) for dynamic libraries.
 540         auxv.push_back(auxv_t(M5_AT_BASE, 0));
 541
 542         //XXX Figure out what this should be.
 543         auxv.push_back(auxv_t(M5_AT_FLAGS, 0));
 544         //The entry point to the program
 545         auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
 546         //Different user and group IDs
 547         auxv.push_back(auxv_t(M5_AT_UID, uid()));
 548         auxv.push_back(auxv_t(M5_AT_EUID, euid()));
 549         auxv.push_back(auxv_t(M5_AT_GID, gid()));
 550         auxv.push_back(auxv_t(M5_AT_EGID, egid()));
 551         //Whether to enable "secure mode" in the executable
 552         auxv.push_back(auxv_t(M5_AT_SECURE, 0));
 553         //The string "x86_64" with unknown meaning
 554         auxv.push_back(auxv_t(M5_AT_PLATFORM, 0));
 555     }
 556
 557     //Figure out how big the initial stack needs to be
 558
 559     // A sentry NULL void pointer at the top of the stack.
 560     int sentry_size = intSize;
 561
 562     //This is the name of the file which is present on the initial stack
 563     //It's purpose is to let the user space linker examine the original file.
 564     int file_name_size = filename.size() + 1;
 565
 566     string platform = "x86_64";
 567     int aux_data_size = platform.size() + 1;
 568
 569     int env_data_size = 0;
 570     for (int i = 0; i < envp.size(); ++i) {
 571         env_data_size += envp[i].size() + 1;
 572     }
 573     int arg_data_size = 0;
 574     for (int i = 0; i < argv.size(); ++i) {
 575         arg_data_size += argv[i].size() + 1;
 576     }
 577
 578     //The info_block needs to be padded so it's size is a multiple of the
 579     //alignment mask. Also, it appears that there needs to be at least some
 580     //padding, so if the size is already a multiple, we need to increase it
 581     //anyway.
 582     int base_info_block_size =
 583         sentry_size + file_name_size + env_data_size + arg_data_size;
 584
 585     int info_block_size = roundUp(base_info_block_size, align);
 586
 587     int info_block_padding = info_block_size - base_info_block_size;
 588
 589     //Each auxilliary vector is two 8 byte words
 590     int aux_array_size = intSize * 2 * (auxv.size() + 1);
 591
 592     int envp_array_size = intSize * (envp.size() + 1);
 593     int argv_array_size = intSize * (argv.size() + 1);
 594
 595     int argc_size = intSize;
 596
 597     //Figure out the size of the contents of the actual initial frame
 598     int frame_size =
 599         aux_array_size +
 600         envp_array_size +
 601         argv_array_size +
 602         argc_size;
 603
 604     //There needs to be padding after the auxiliary vector data so that the
 605     //very bottom of the stack is aligned properly.
 606     int partial_size = frame_size + aux_data_size;
 607     int aligned_partial_size = roundUp(partial_size, align);
 608     int aux_padding = aligned_partial_size - partial_size;
 609
 610     int space_needed =
 611         info_block_size +
 612         aux_data_size +
 613         aux_padding +
 614         frame_size;
 615
 616     stack_min = stack_base - space_needed;
 617     stack_min = roundDown(stack_min, align);
 618     stack_size = stack_base - stack_min;
 619
 620     // map memory
 621     pTable->allocate(roundDown(stack_min, pageSize),
 622                      roundUp(stack_size, pageSize));
 623
 624     // map out initial stack contents
 625     IntType sentry_base = stack_base - sentry_size;
 626     IntType file_name_base = sentry_base - file_name_size;
 627     IntType env_data_base = file_name_base - env_data_size;
 628     IntType arg_data_base = env_data_base - arg_data_size;
 629     IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size;
 630     IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding;
 631     IntType envp_array_base = auxv_array_base - envp_array_size;
 632     IntType argv_array_base = envp_array_base - argv_array_size;
 633     IntType argc_base = argv_array_base - argc_size;
 634
 635     DPRINTF(Stack, "The addresses of items on the initial stack:\n");
 636     DPRINTF(Stack, "0x%x - file name\n", file_name_base);
 637     DPRINTF(Stack, "0x%x - env data\n", env_data_base);
 638     DPRINTF(Stack, "0x%x - arg data\n", arg_data_base);
 639     DPRINTF(Stack, "0x%x - aux data\n", aux_data_base);
 640     DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base);
 641     DPRINTF(Stack, "0x%x - envp array\n", envp_array_base);
 642     DPRINTF(Stack, "0x%x - argv array\n", argv_array_base);
 643     DPRINTF(Stack, "0x%x - argc \n", argc_base);
 644     DPRINTF(Stack, "0x%x - stack min\n", stack_min);
 645
 646     // write contents to stack
 647
 648     // figure out argc
 649     IntType argc = argv.size();
 650     IntType guestArgc = X86ISA::htog(argc);
 651
 652     //Write out the sentry void *
 653     IntType sentry_NULL = 0;
 654     initVirtMem->writeBlob(sentry_base,
 655             (uint8_t*)&sentry_NULL, sentry_size);
 656
 657     //Write the file name
 658     initVirtMem->writeString(file_name_base, filename.c_str());
 659
 660     //Fix up the aux vector which points to the "platform" string
 661     assert(auxv[auxv.size() - 1].a_type = M5_AT_PLATFORM);
 662     auxv[auxv.size() - 1].a_val = aux_data_base;
 663
 664     //Copy the aux stuff
 665     for(int x = 0; x < auxv.size(); x++)
 666     {
 667         initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
 668                 (uint8_t*)&(auxv[x].a_type), intSize);
 669         initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
 670                 (uint8_t*)&(auxv[x].a_val), intSize);
 671     }
 672     //Write out the terminating zeroed auxilliary vector
 673     const uint64_t zero = 0;
 674     initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
 675             (uint8_t*)&zero, 2 * intSize);
 676
 677     initVirtMem->writeString(aux_data_base, platform.c_str());
 678
 679     copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
 680     copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
 681
 682     initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
 683
 684     ThreadContext *tc = system->getThreadContext(contextIds[0]);
 685     //Set the stack pointer register
 686     tc->setIntReg(StackPointerReg, stack_min);
 687
 688     Addr prog_entry = objFile->entryPoint();
 689     // There doesn't need to be any segment base added in since we're dealing
 690     // with the flat segmentation model.
 691     tc->setPC(prog_entry);
 692     tc->setNextPC(prog_entry + sizeof(MachInst));
 693
 694     //Align the "stack_min" to a page boundary.
 695     stack_min = roundDown(stack_min, pageSize);
 696
 697 //    num_processes++;
 698 }
 699
 700 void
 701 X86_64LiveProcess::argsInit(int intSize, int pageSize)
 702 {
 703     std::vector<AuxVector<uint64_t> > extraAuxvs;
 704     X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs);
 705 }
 706
 707 void
 708 I386LiveProcess::argsInit(int intSize, int pageSize)
 709 {
 710     std::vector<AuxVector<uint32_t> > extraAuxvs;
 711     //Tell the binary where the vsyscall part of the vsyscall page is.
 712     extraAuxvs.push_back(AuxVector<uint32_t>(0x20,
 713                 vsyscallPage.base + vsyscallPage.vsyscallOffset));
 714     extraAuxvs.push_back(AuxVector<uint32_t>(0x21, vsyscallPage.base));
 715     X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs);
 716 }
 717
 718 void
 719 X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value)
 720 {
 721     tc->setIntReg(INTREG_RAX, return_value.value());
 722 }
 723
 724 X86ISA::IntReg
 725 X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int &i)
 726 {
 727     assert(i < NumArgumentRegs);
 728     return tc->readIntReg(ArgumentReg[i++]);
 729 }
 730
 731 void
 732 X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val)
 733 {
 734     assert(i < NumArgumentRegs);
 735     return tc->setIntReg(ArgumentReg[i], val);
 736 }
 737
 738 X86ISA::IntReg
 739 I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i)
 740 {
 741     assert(i < NumArgumentRegs32);
 742     return tc->readIntReg(ArgumentReg32[i++]);
 743 }
 744
 745 X86ISA::IntReg
 746 I386LiveProcess::getSyscallArg(ThreadContext *tc, int &i, int width)
 747 {
 748     assert(width == 32 || width == 64);
 749     assert(i < NumArgumentRegs);
 750     uint64_t retVal = tc->readIntReg(ArgumentReg32[i++]) & mask(32);
 751     if (width == 64)
 752         retVal |= ((uint64_t)tc->readIntReg(ArgumentReg[i++]) << 32);
 753     return retVal;
 754 }
 755
 756 void
 757 I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val)
 758 {
 759     assert(i < NumArgumentRegs);
 760     return tc->setIntReg(ArgumentReg[i], val);
 761 }