sim/syscall_emul.hh

   1 /*
   2  * Copyright (c) 2003-2005 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
  29 #ifndef __SIM_SYSCALL_EMUL_HH__
  30 #define __SIM_SYSCALL_EMUL_HH__
  31
  32 ///
  33 /// @file syscall_emul.hh
  34 ///
  35 /// This file defines objects used to emulate syscalls from the target
  36 /// application on the host machine.
  37
  38 #include <errno.h>
  39 #include <string>
  40 #ifdef __CYGWIN32__
  41 #include <sys/fcntl.h>  // for O_BINARY
  42 #endif
  43 #include <sys/uio.h>
  44
  45 #include "base/intmath.hh"      // for RoundUp
  46 #include "mem/functional/functional.hh"
  47 #include "targetarch/isa_traits.hh"     // for Addr
  48
  49 #include "base/trace.hh"
  50 #include "cpu/exec_context.hh"
  51 #include "sim/process.hh"
  52
  53 ///
  54 /// System call descriptor.
  55 ///
  56 class SyscallDesc {
  57
  58   public:
  59
  60     /// Typedef for target syscall handler functions.
  61     typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
  62                            Process *, ExecContext *);
  63
  64     const char *name;   //!< Syscall name (e.g., "open").
  65     FuncPtr funcPtr;    //!< Pointer to emulation function.
  66     int flags;          //!< Flags (see Flags enum).
  67
  68     /// Flag values for controlling syscall behavior.
  69     enum Flags {
  70         /// Don't set return regs according to funcPtr return value.
  71         /// Used for syscalls with non-standard return conventions
  72         /// that explicitly set the ExecContext regs (e.g.,
  73         /// sigreturn).
  74         SuppressReturnValue = 1
  75     };
  76
  77     /// Constructor.
  78     SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
  79         : name(_name), funcPtr(_funcPtr), flags(_flags)
  80     {
  81     }
  82
  83     /// Emulate the syscall.  Public interface for calling through funcPtr.
  84     void doSyscall(int callnum, Process *proc, ExecContext *xc);
  85 };
  86
  87
  88 class BaseBufferArg {
  89
  90   public:
  91
  92     BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
  93     {
  94         bufPtr = new uint8_t[size];
  95         // clear out buffer: in case we only partially populate this,
  96         // and then do a copyOut(), we want to make sure we don't
  97         // introduce any random junk into the simulated address space
  98         memset(bufPtr, 0, size);
  99     }
 100
 101     virtual ~BaseBufferArg() { delete [] bufPtr; }
 102
 103     //
 104     // copy data into simulator space (read from target memory)
 105     //
 106     virtual bool copyIn(FunctionalMemory *mem)
 107     {
 108         mem->access(Read, addr, bufPtr, size);
 109         return true;    // no EFAULT detection for now
 110     }
 111
 112     //
 113     // copy data out of simulator space (write to target memory)
 114     //
 115     virtual bool copyOut(FunctionalMemory *mem)
 116     {
 117         mem->access(Write, addr, bufPtr, size);
 118         return true;    // no EFAULT detection for now
 119     }
 120
 121   protected:
 122     Addr addr;
 123     int size;
 124     uint8_t *bufPtr;
 125 };
 126
 127
 128 class BufferArg : public BaseBufferArg
 129 {
 130   public:
 131     BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
 132     void *bufferPtr()   { return bufPtr; }
 133 };
 134
 135 template <class T>
 136 class TypedBufferArg : public BaseBufferArg
 137 {
 138   public:
 139     // user can optionally specify a specific number of bytes to
 140     // allocate to deal with those structs that have variable-size
 141     // arrays at the end
 142     TypedBufferArg(Addr _addr, int _size = sizeof(T))
 143         : BaseBufferArg(_addr, _size)
 144     { }
 145
 146     // type case
 147     operator T*() { return (T *)bufPtr; }
 148
 149     // dereference operators
 150     T &operator*()       { return *((T *)bufPtr); }
 151     T* operator->()      { return (T *)bufPtr; }
 152     T &operator[](int i) { return ((T *)bufPtr)[i]; }
 153 };
 154
 155 //////////////////////////////////////////////////////////////////////
 156 //
 157 // The following emulation functions are generic enough that they
 158 // don't need to be recompiled for different emulated OS's.  They are
 159 // defined in sim/syscall_emul.cc.
 160 //
 161 //////////////////////////////////////////////////////////////////////
 162
 163
 164 /// Handler for unimplemented syscalls that we haven't thought about.
 165 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 166                                 Process *p, ExecContext *xc);
 167
 168 /// Handler for unimplemented syscalls that we never intend to
 169 /// implement (signal handling, etc.) and should not affect the correct
 170 /// behavior of the program.  Print a warning only if the appropriate
 171 /// trace flag is enabled.  Return success to the target program.
 172 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 173                          Process *p, ExecContext *xc);
 174
 175 /// Target exit() handler: terminate simulation.
 176 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 177                        Process *p, ExecContext *xc);
 178
 179 /// Target getpagesize() handler.
 180 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 181                               Process *p, ExecContext *xc);
 182
 183 /// Target obreak() handler: set brk address.
 184 SyscallReturn obreakFunc(SyscallDesc *desc, int num,
 185                          Process *p, ExecContext *xc);
 186
 187 /// Target close() handler.
 188 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 189                         Process *p, ExecContext *xc);
 190
 191 /// Target read() handler.
 192 SyscallReturn readFunc(SyscallDesc *desc, int num,
 193                        Process *p, ExecContext *xc);
 194
 195 /// Target write() handler.
 196 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 197                         Process *p, ExecContext *xc);
 198
 199 /// Target lseek() handler.
 200 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 201                         Process *p, ExecContext *xc);
 202
 203 /// Target munmap() handler.
 204 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 205                          Process *p, ExecContext *xc);
 206
 207 /// Target gethostname() handler.
 208 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 209                               Process *p, ExecContext *xc);
 210
 211 /// Target unlink() handler.
 212 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 213                          Process *p, ExecContext *xc);
 214
 215 /// Target rename() handler.
 216 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 217                          Process *p, ExecContext *xc);
 218
 219
 220 /// Target truncate() handler.
 221 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 222                            Process *p, ExecContext *xc);
 223
 224
 225 /// Target ftruncate() handler.
 226 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 227                             Process *p, ExecContext *xc);
 228
 229
 230 /// Target chown() handler.
 231 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 232                         Process *p, ExecContext *xc);
 233
 234
 235 /// Target fchown() handler.
 236 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 237                          Process *p, ExecContext *xc);
 238
 239 /// This struct is used to build an target-OS-dependent table that
 240 /// maps the target's open() flags to the host open() flags.
 241 struct OpenFlagTransTable {
 242     int tgtFlag;        //!< Target system flag value.
 243     int hostFlag;       //!< Corresponding host system flag value.
 244 };
 245
 246
 247
 248 /// A readable name for 1,000,000, for converting microseconds to seconds.
 249 const int one_million = 1000000;
 250
 251 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 252 /// by my reckoning.  We want to keep this a constant (not use the
 253 /// real-world time) to keep simulations repeatable.
 254 const unsigned seconds_since_epoch = 1000000000;
 255
 256 /// Helper function to convert current elapsed time to seconds and
 257 /// microseconds.
 258 template <class T1, class T2>
 259 void
 260 getElapsedTime(T1 &sec, T2 &usec)
 261 {
 262     int elapsed_usecs = curTick / Clock::Int::us;
 263     sec = elapsed_usecs / one_million;
 264     usec = elapsed_usecs % one_million;
 265 }
 266
 267 //////////////////////////////////////////////////////////////////////
 268 //
 269 // The following emulation functions are generic, but need to be
 270 // templated to account for differences in types, constants, etc.
 271 //
 272 //////////////////////////////////////////////////////////////////////
 273
 274 /// Target ioctl() handler.  For the most part, programs call ioctl()
 275 /// only to find out if their stdout is a tty, to determine whether to
 276 /// do line or block buffering.
 277 template <class OS>
 278 SyscallReturn
 279 ioctlFunc(SyscallDesc *desc, int callnum, Process *process,
 280           ExecContext *xc)
 281 {
 282     int fd = xc->getSyscallArg(0);
 283     unsigned req = xc->getSyscallArg(1);
 284
 285     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 286
 287     if (fd < 0 || process->sim_fd(fd) < 0) {
 288         // doesn't map to any simulator fd: not a valid target fd
 289         return -EBADF;
 290     }
 291
 292     switch (req) {
 293       case OS::TIOCISATTY:
 294       case OS::TIOCGETP:
 295       case OS::TIOCSETP:
 296       case OS::TIOCSETN:
 297       case OS::TIOCSETC:
 298       case OS::TIOCGETC:
 299       case OS::TIOCGETS:
 300       case OS::TIOCGETA:
 301         return -ENOTTY;
 302
 303       default:
 304         fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
 305               fd, req, xc->readPC());
 306     }
 307 }
 308
 309 /// Target open() handler.
 310 template <class OS>
 311 SyscallReturn
 312 openFunc(SyscallDesc *desc, int callnum, Process *process,
 313          ExecContext *xc)
 314 {
 315     std::string path;
 316
 317     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 318         return -EFAULT;
 319
 320     if (path == "/dev/sysdev0") {
 321         // This is a memory-mapped high-resolution timer device on Alpha.
 322         // We don't support it, so just punt.
 323         warn("Ignoring open(%s, ...)\n", path);
 324         return -ENOENT;
 325     }
 326
 327     int tgtFlags = xc->getSyscallArg(1);
 328     int mode = xc->getSyscallArg(2);
 329     int hostFlags = 0;
 330
 331     // translate open flags
 332     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 333         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 334             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 335             hostFlags |= OS::openFlagTable[i].hostFlag;
 336         }
 337     }
 338
 339     // any target flags left?
 340     if (tgtFlags != 0)
 341         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 342
 343 #ifdef __CYGWIN32__
 344     hostFlags |= O_BINARY;
 345 #endif
 346
 347     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 348
 349     // open the file
 350     int fd = open(path.c_str(), hostFlags, mode);
 351
 352     return (fd == -1) ? -errno : process->alloc_fd(fd);
 353 }
 354
 355
 356 /// Target chmod() handler.
 357 template <class OS>
 358 SyscallReturn
 359 chmodFunc(SyscallDesc *desc, int callnum, Process *process,
 360           ExecContext *xc)
 361 {
 362     std::string path;
 363
 364     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 365         return -EFAULT;
 366
 367     uint32_t mode = xc->getSyscallArg(1);
 368     mode_t hostMode = 0;
 369
 370     // XXX translate mode flags via OS::something???
 371     hostMode = mode;
 372
 373     // do the chmod
 374     int result = chmod(path.c_str(), hostMode);
 375     if (result < 0)
 376         return errno;
 377
 378     return 0;
 379 }
 380
 381
 382 /// Target fchmod() handler.
 383 template <class OS>
 384 SyscallReturn
 385 fchmodFunc(SyscallDesc *desc, int callnum, Process *process,
 386            ExecContext *xc)
 387 {
 388     int fd = xc->getSyscallArg(0);
 389     if (fd < 0 || process->sim_fd(fd) < 0) {
 390         // doesn't map to any simulator fd: not a valid target fd
 391         return -EBADF;
 392     }
 393
 394     uint32_t mode = xc->getSyscallArg(1);
 395     mode_t hostMode = 0;
 396
 397     // XXX translate mode flags via OS::someting???
 398     hostMode = mode;
 399
 400     // do the fchmod
 401     int result = fchmod(process->sim_fd(fd), hostMode);
 402     if (result < 0)
 403         return errno;
 404
 405     return 0;
 406 }
 407
 408
 409 /// Target stat() handler.
 410 template <class OS>
 411 SyscallReturn
 412 statFunc(SyscallDesc *desc, int callnum, Process *process,
 413          ExecContext *xc)
 414 {
 415     std::string path;
 416
 417     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 418         return -EFAULT;
 419
 420     struct stat hostBuf;
 421     int result = stat(path.c_str(), &hostBuf);
 422
 423     if (result < 0)
 424         return errno;
 425
 426     OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 427
 428     return 0;
 429 }
 430
 431
 432 /// Target fstat64() handler.
 433 template <class OS>
 434 SyscallReturn
 435 fstat64Func(SyscallDesc *desc, int callnum, Process *process,
 436             ExecContext *xc)
 437 {
 438     int fd = xc->getSyscallArg(0);
 439     if (fd < 0 || process->sim_fd(fd) < 0) {
 440         // doesn't map to any simulator fd: not a valid target fd
 441         return -EBADF;
 442     }
 443
 444     struct stat64 hostBuf;
 445     int result = fstat64(process->sim_fd(fd), &hostBuf);
 446
 447     if (result < 0)
 448         return errno;
 449
 450     OS::copyOutStat64Buf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 451
 452     return 0;
 453 }
 454
 455
 456 /// Target lstat() handler.
 457 template <class OS>
 458 SyscallReturn
 459 lstatFunc(SyscallDesc *desc, int callnum, Process *process,
 460           ExecContext *xc)
 461 {
 462     std::string path;
 463
 464     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 465         return -EFAULT;
 466
 467     struct stat hostBuf;
 468     int result = lstat(path.c_str(), &hostBuf);
 469
 470     if (result < 0)
 471         return -errno;
 472
 473     OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 474
 475     return 0;
 476 }
 477
 478 /// Target lstat64() handler.
 479 template <class OS>
 480 SyscallReturn
 481 lstat64Func(SyscallDesc *desc, int callnum, Process *process,
 482             ExecContext *xc)
 483 {
 484     std::string path;
 485
 486     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 487         return -EFAULT;
 488
 489     struct stat64 hostBuf;
 490     int result = lstat64(path.c_str(), &hostBuf);
 491
 492     if (result < 0)
 493         return -errno;
 494
 495     OS::copyOutStat64Buf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 496
 497     return 0;
 498 }
 499
 500 /// Target fstat() handler.
 501 template <class OS>
 502 SyscallReturn
 503 fstatFunc(SyscallDesc *desc, int callnum, Process *process,
 504           ExecContext *xc)
 505 {
 506     int fd = process->sim_fd(xc->getSyscallArg(0));
 507
 508     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
 509
 510     if (fd < 0)
 511         return -EBADF;
 512
 513     struct stat hostBuf;
 514     int result = fstat(fd, &hostBuf);
 515
 516     if (result < 0)
 517         return -errno;
 518
 519     OS::copyOutStatBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 520
 521     return 0;
 522 }
 523
 524
 525 /// Target statfs() handler.
 526 template <class OS>
 527 SyscallReturn
 528 statfsFunc(SyscallDesc *desc, int callnum, Process *process,
 529            ExecContext *xc)
 530 {
 531     std::string path;
 532
 533     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 534         return -EFAULT;
 535
 536     struct statfs hostBuf;
 537     int result = statfs(path.c_str(), &hostBuf);
 538
 539     if (result < 0)
 540         return errno;
 541
 542     OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 543
 544     return 0;
 545 }
 546
 547
 548 /// Target fstatfs() handler.
 549 template <class OS>
 550 SyscallReturn
 551 fstatfsFunc(SyscallDesc *desc, int callnum, Process *process,
 552             ExecContext *xc)
 553 {
 554     int fd = process->sim_fd(xc->getSyscallArg(0));
 555
 556     if (fd < 0)
 557         return -EBADF;
 558
 559     struct statfs hostBuf;
 560     int result = fstatfs(fd, &hostBuf);
 561
 562     if (result < 0)
 563         return errno;
 564
 565     OS::copyOutStatfsBuf(xc->mem, xc->getSyscallArg(1), &hostBuf);
 566
 567     return 0;
 568 }
 569
 570
 571 /// Target writev() handler.
 572 template <class OS>
 573 SyscallReturn
 574 writevFunc(SyscallDesc *desc, int callnum, Process *process,
 575            ExecContext *xc)
 576 {
 577     int fd = xc->getSyscallArg(0);
 578     if (fd < 0 || process->sim_fd(fd) < 0) {
 579         // doesn't map to any simulator fd: not a valid target fd
 580         return -EBADF;
 581     }
 582
 583     uint64_t tiov_base = xc->getSyscallArg(1);
 584     size_t count = xc->getSyscallArg(2);
 585     struct iovec hiov[count];
 586     for (int i = 0; i < count; ++i)
 587     {
 588         typename OS::tgt_iovec tiov;
 589         xc->mem->access(Read, tiov_base + i*sizeof(typename OS::tgt_iovec),
 590                         &tiov, sizeof(typename OS::tgt_iovec));
 591         hiov[i].iov_len = tiov.iov_len;
 592         hiov[i].iov_base = new char [hiov[i].iov_len];
 593         xc->mem->access(Read, tiov.iov_base,
 594                         hiov[i].iov_base, hiov[i].iov_len);
 595     }
 596
 597     int result = writev(process->sim_fd(fd), hiov, count);
 598
 599     for (int i = 0; i < count; ++i)
 600     {
 601         delete [] (char *)hiov[i].iov_base;
 602     }
 603
 604     if (result < 0)
 605         return errno;
 606
 607     return 0;
 608 }
 609
 610
 611 /// Target mmap() handler.
 612 ///
 613 /// We don't really handle mmap().  If the target is mmaping an
 614 /// anonymous region or /dev/zero, we can get away with doing basically
 615 /// nothing (since memory is initialized to zero and the simulator
 616 /// doesn't really check addresses anyway).  Always print a warning,
 617 /// since this could be seriously broken if we're not mapping
 618 /// /dev/zero.
 619 //
 620 /// Someday we should explicitly check for /dev/zero in open, flag the
 621 /// file descriptor, and fail (or implement!) a non-anonymous mmap to
 622 /// anything else.
 623 template <class OS>
 624 SyscallReturn
 625 mmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
 626 {
 627     Addr start = xc->getSyscallArg(0);
 628     uint64_t length = xc->getSyscallArg(1);
 629     // int prot = xc->getSyscallArg(2);
 630     int flags = xc->getSyscallArg(3);
 631     // int fd = p->sim_fd(xc->getSyscallArg(4));
 632     // int offset = xc->getSyscallArg(5);
 633
 634     if (start == 0) {
 635         // user didn't give an address... pick one from our "mmap region"
 636         start = p->mmap_end;
 637         p->mmap_end += roundUp(length, VMPageSize);
 638         if (p->nxm_start != 0) {
 639             //If we have an nxm space, make sure we haven't colided
 640             assert(p->mmap_end < p->nxm_start);
 641         }
 642     }
 643
 644     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
 645         warn("allowing mmap of file @ fd %d. "
 646              "This will break if not /dev/zero.", xc->getSyscallArg(4));
 647     }
 648
 649     return start;
 650 }
 651
 652 /// Target getrlimit() handler.
 653 template <class OS>
 654 SyscallReturn
 655 getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
 656               ExecContext *xc)
 657 {
 658     unsigned resource = xc->getSyscallArg(0);
 659     TypedBufferArg<typename OS::rlimit> rlp(xc->getSyscallArg(1));
 660
 661     switch (resource) {
 662       case OS::RLIMIT_STACK:
 663         // max stack size in bytes: make up a number (2MB for now)
 664         rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
 665         break;
 666
 667       default:
 668         std::cerr << "getrlimitFunc: unimplemented resource " << resource
 669                   << std::endl;
 670         abort();
 671         break;
 672     }
 673
 674     rlp.copyOut(xc->mem);
 675     return 0;
 676 }
 677
 678 /// Target gettimeofday() handler.
 679 template <class OS>
 680 SyscallReturn
 681 gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process,
 682                  ExecContext *xc)
 683 {
 684     TypedBufferArg<typename OS::timeval> tp(xc->getSyscallArg(0));
 685
 686     getElapsedTime(tp->tv_sec, tp->tv_usec);
 687     tp->tv_sec += seconds_since_epoch;
 688
 689     tp.copyOut(xc->mem);
 690
 691     return 0;
 692 }
 693
 694
 695 /// Target utimes() handler.
 696 template <class OS>
 697 SyscallReturn
 698 utimesFunc(SyscallDesc *desc, int callnum, Process *process,
 699            ExecContext *xc)
 700 {
 701     std::string path;
 702
 703     if (xc->mem->readString(path, xc->getSyscallArg(0)) != No_Fault)
 704         return -EFAULT;
 705
 706     TypedBufferArg<typename OS::timeval [2]> tp(xc->getSyscallArg(1));
 707     tp.copyIn(xc->mem);
 708
 709     struct timeval hostTimeval[2];
 710     for (int i = 0; i < 2; ++i)
 711     {
 712         hostTimeval[i].tv_sec = (*tp)[i].tv_sec;
 713         hostTimeval[i].tv_usec = (*tp)[i].tv_usec;
 714     }
 715     int result = utimes(path.c_str(), hostTimeval);
 716
 717     if (result < 0)
 718         return -errno;
 719
 720     return 0;
 721 }
 722
 723 /// Target getrusage() function.
 724 template <class OS>
 725 SyscallReturn
 726 getrusageFunc(SyscallDesc *desc, int callnum, Process *process,
 727               ExecContext *xc)
 728 {
 729     int who = xc->getSyscallArg(0);     // THREAD, SELF, or CHILDREN
 730     TypedBufferArg<typename OS::rusage> rup(xc->getSyscallArg(1));
 731
 732     if (who != OS::RUSAGE_SELF) {
 733         // don't really handle THREAD or CHILDREN, but just warn and
 734         // plow ahead
 735         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
 736              who);
 737     }
 738
 739     getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
 740     rup->ru_stime.tv_sec = 0;
 741     rup->ru_stime.tv_usec = 0;
 742     rup->ru_maxrss = 0;
 743     rup->ru_ixrss = 0;
 744     rup->ru_idrss = 0;
 745     rup->ru_isrss = 0;
 746     rup->ru_minflt = 0;
 747     rup->ru_majflt = 0;
 748     rup->ru_nswap = 0;
 749     rup->ru_inblock = 0;
 750     rup->ru_oublock = 0;
 751     rup->ru_msgsnd = 0;
 752     rup->ru_msgrcv = 0;
 753     rup->ru_nsignals = 0;
 754     rup->ru_nvcsw = 0;
 755     rup->ru_nivcsw = 0;
 756
 757     rup.copyOut(xc->mem);
 758
 759     return 0;
 760 }
 761
 762 #endif // __SIM_SYSCALL_EMUL_HH__