src/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  * Authors: Steve Reinhardt
  29  *          Kevin Lim
  30  */
  31
  32 #ifndef __SIM_SYSCALL_EMUL_HH__
  33 #define __SIM_SYSCALL_EMUL_HH__
  34
  35 #define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
  36                    defined(__FreeBSD__) || defined(__CYGWIN__))
  37
  38 ///
  39 /// @file syscall_emul.hh
  40 ///
  41 /// This file defines objects used to emulate syscalls from the target
  42 /// application on the host machine.
  43
  44 #ifdef __CYGWIN32__
  45 #include <sys/fcntl.h>  // for O_BINARY
  46 #endif
  47 #include <sys/stat.h>
  48 #include <sys/time.h>
  49 #include <sys/uio.h>
  50 #include <fcntl.h>
  51
  52 #include <cerrno>
  53 #include <string>
  54
  55 #include "base/chunk_generator.hh"
  56 #include "base/intmath.hh"      // for RoundUp
  57 #include "base/misc.hh"
  58 #include "base/trace.hh"
  59 #include "base/types.hh"
  60 #include "config/the_isa.hh"
  61 #include "cpu/base.hh"
  62 #include "cpu/thread_context.hh"
  63 #include "debug/SyscallVerbose.hh"
  64 #include "mem/page_table.hh"
  65 #include "mem/se_translating_port_proxy.hh"
  66 #include "sim/byteswap.hh"
  67 #include "sim/process.hh"
  68 #include "sim/syscallreturn.hh"
  69 #include "sim/system.hh"
  70
  71 ///
  72 /// System call descriptor.
  73 ///
  74 class SyscallDesc {
  75
  76   public:
  77
  78     /// Typedef for target syscall handler functions.
  79     typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
  80                            LiveProcess *, ThreadContext *);
  81
  82     const char *name;   //!< Syscall name (e.g., "open").
  83     FuncPtr funcPtr;    //!< Pointer to emulation function.
  84     int flags;          //!< Flags (see Flags enum).
  85
  86     /// Flag values for controlling syscall behavior.
  87     enum Flags {
  88         /// Don't set return regs according to funcPtr return value.
  89         /// Used for syscalls with non-standard return conventions
  90         /// that explicitly set the ThreadContext regs (e.g.,
  91         /// sigreturn).
  92         SuppressReturnValue = 1
  93     };
  94
  95     /// Constructor.
  96     SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
  97         : name(_name), funcPtr(_funcPtr), flags(_flags)
  98     {
  99     }
 100
 101     /// Emulate the syscall.  Public interface for calling through funcPtr.
 102     void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
 103 };
 104
 105
 106 class BaseBufferArg {
 107
 108   public:
 109
 110     BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
 111     {
 112         bufPtr = new uint8_t[size];
 113         // clear out buffer: in case we only partially populate this,
 114         // and then do a copyOut(), we want to make sure we don't
 115         // introduce any random junk into the simulated address space
 116         memset(bufPtr, 0, size);
 117     }
 118
 119     virtual ~BaseBufferArg() { delete [] bufPtr; }
 120
 121     //
 122     // copy data into simulator space (read from target memory)
 123     //
 124     virtual bool copyIn(SETranslatingPortProxy &memproxy)
 125     {
 126         memproxy.readBlob(addr, bufPtr, size);
 127         return true;    // no EFAULT detection for now
 128     }
 129
 130     //
 131     // copy data out of simulator space (write to target memory)
 132     //
 133     virtual bool copyOut(SETranslatingPortProxy &memproxy)
 134     {
 135         memproxy.writeBlob(addr, bufPtr, size);
 136         return true;    // no EFAULT detection for now
 137     }
 138
 139   protected:
 140     Addr addr;
 141     int size;
 142     uint8_t *bufPtr;
 143 };
 144
 145
 146 class BufferArg : public BaseBufferArg
 147 {
 148   public:
 149     BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
 150     void *bufferPtr()   { return bufPtr; }
 151 };
 152
 153 template <class T>
 154 class TypedBufferArg : public BaseBufferArg
 155 {
 156   public:
 157     // user can optionally specify a specific number of bytes to
 158     // allocate to deal with those structs that have variable-size
 159     // arrays at the end
 160     TypedBufferArg(Addr _addr, int _size = sizeof(T))
 161         : BaseBufferArg(_addr, _size)
 162     { }
 163
 164     // type case
 165     operator T*() { return (T *)bufPtr; }
 166
 167     // dereference operators
 168     T &operator*()       { return *((T *)bufPtr); }
 169     T* operator->()      { return (T *)bufPtr; }
 170     T &operator[](int i) { return ((T *)bufPtr)[i]; }
 171 };
 172
 173 //////////////////////////////////////////////////////////////////////
 174 //
 175 // The following emulation functions are generic enough that they
 176 // don't need to be recompiled for different emulated OS's.  They are
 177 // defined in sim/syscall_emul.cc.
 178 //
 179 //////////////////////////////////////////////////////////////////////
 180
 181
 182 /// Handler for unimplemented syscalls that we haven't thought about.
 183 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 184                                 LiveProcess *p, ThreadContext *tc);
 185
 186 /// Handler for unimplemented syscalls that we never intend to
 187 /// implement (signal handling, etc.) and should not affect the correct
 188 /// behavior of the program.  Print a warning only if the appropriate
 189 /// trace flag is enabled.  Return success to the target program.
 190 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 191                          LiveProcess *p, ThreadContext *tc);
 192 SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
 193                          LiveProcess *p, ThreadContext *tc);
 194
 195 /// Target exit() handler: terminate current context.
 196 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 197                        LiveProcess *p, ThreadContext *tc);
 198
 199 /// Target exit_group() handler: terminate simulation. (exit all threads)
 200 SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
 201                        LiveProcess *p, ThreadContext *tc);
 202
 203 /// Target getpagesize() handler.
 204 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 205                               LiveProcess *p, ThreadContext *tc);
 206
 207 /// Target brk() handler: set brk address.
 208 SyscallReturn brkFunc(SyscallDesc *desc, int num,
 209                       LiveProcess *p, ThreadContext *tc);
 210
 211 /// Target close() handler.
 212 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 213                         LiveProcess *p, ThreadContext *tc);
 214
 215 /// Target read() handler.
 216 SyscallReturn readFunc(SyscallDesc *desc, int num,
 217                        LiveProcess *p, ThreadContext *tc);
 218
 219 /// Target write() handler.
 220 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 221                         LiveProcess *p, ThreadContext *tc);
 222
 223 /// Target lseek() handler.
 224 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 225                         LiveProcess *p, ThreadContext *tc);
 226
 227 /// Target _llseek() handler.
 228 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
 229                         LiveProcess *p, ThreadContext *tc);
 230
 231 /// Target munmap() handler.
 232 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 233                          LiveProcess *p, ThreadContext *tc);
 234
 235 /// Target gethostname() handler.
 236 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 237                               LiveProcess *p, ThreadContext *tc);
 238
 239 /// Target getcwd() handler.
 240 SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
 241                          LiveProcess *p, ThreadContext *tc);
 242
 243 /// Target unlink() handler.
 244 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 245                            LiveProcess *p, ThreadContext *tc);
 246
 247 /// Target unlink() handler.
 248 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 249                          LiveProcess *p, ThreadContext *tc);
 250
 251 /// Target mkdir() handler.
 252 SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
 253                         LiveProcess *p, ThreadContext *tc);
 254
 255 /// Target rename() handler.
 256 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 257                          LiveProcess *p, ThreadContext *tc);
 258
 259
 260 /// Target truncate() handler.
 261 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 262                            LiveProcess *p, ThreadContext *tc);
 263
 264
 265 /// Target ftruncate() handler.
 266 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 267                             LiveProcess *p, ThreadContext *tc);
 268
 269
 270 /// Target truncate64() handler.
 271 SyscallReturn truncate64Func(SyscallDesc *desc, int num,
 272                              LiveProcess *p, ThreadContext *tc);
 273
 274 /// Target ftruncate64() handler.
 275 SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
 276                               LiveProcess *p, ThreadContext *tc);
 277
 278
 279 /// Target umask() handler.
 280 SyscallReturn umaskFunc(SyscallDesc *desc, int num,
 281                         LiveProcess *p, ThreadContext *tc);
 282
 283
 284 /// Target chown() handler.
 285 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 286                         LiveProcess *p, ThreadContext *tc);
 287
 288
 289 /// Target fchown() handler.
 290 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 291                          LiveProcess *p, ThreadContext *tc);
 292
 293 /// Target dup() handler.
 294 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 295                       LiveProcess *process, ThreadContext *tc);
 296
 297 /// Target fnctl() handler.
 298 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 299                         LiveProcess *process, ThreadContext *tc);
 300
 301 /// Target fcntl64() handler.
 302 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 303                         LiveProcess *process, ThreadContext *tc);
 304
 305 /// Target setuid() handler.
 306 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 307                                LiveProcess *p, ThreadContext *tc);
 308
 309 /// Target getpid() handler.
 310 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 311                                LiveProcess *p, ThreadContext *tc);
 312
 313 /// Target getuid() handler.
 314 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 315                                LiveProcess *p, ThreadContext *tc);
 316
 317 /// Target getgid() handler.
 318 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 319                                LiveProcess *p, ThreadContext *tc);
 320
 321 /// Target getppid() handler.
 322 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 323                                LiveProcess *p, ThreadContext *tc);
 324
 325 /// Target geteuid() handler.
 326 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 327                                LiveProcess *p, ThreadContext *tc);
 328
 329 /// Target getegid() handler.
 330 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 331                                LiveProcess *p, ThreadContext *tc);
 332
 333 /// Target clone() handler.
 334 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
 335                                LiveProcess *p, ThreadContext *tc);
 336
 337 /// Futex system call
 338 ///  Implemented by Daniel Sanchez
 339 ///  Used by printf's in multi-threaded apps
 340 template <class OS>
 341 SyscallReturn
 342 futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 343           ThreadContext *tc)
 344 {
 345     int index_uaddr = 0;
 346     int index_op = 1;
 347     int index_val = 2;
 348     int index_timeout = 3;
 349
 350     uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
 351     int op = process->getSyscallArg(tc, index_op);
 352     int val = process->getSyscallArg(tc, index_val);
 353     uint64_t timeout = process->getSyscallArg(tc, index_timeout);
 354
 355     std::map<uint64_t, std::list<ThreadContext *> * >
 356         &futex_map = tc->getSystemPtr()->futexMap;
 357
 358     DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
 359             uaddr, op, val);
 360
 361
 362     if (op == OS::TGT_FUTEX_WAIT) {
 363         if (timeout != 0) {
 364             warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
 365                  "we'll wait indefinitely");
 366         }
 367
 368         uint8_t *buf = new uint8_t[sizeof(int)];
 369         tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
 370         int mem_val = *((int *)buf);
 371         delete buf;
 372
 373         if(val != mem_val) {
 374             DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
 375                                     "expected: %d\n", mem_val, val);
 376             return -OS::TGT_EWOULDBLOCK;
 377         }
 378
 379         // Queue the thread context
 380         std::list<ThreadContext *> * tcWaitList;
 381         if (futex_map.count(uaddr)) {
 382             tcWaitList = futex_map.find(uaddr)->second;
 383         } else {
 384             tcWaitList = new std::list<ThreadContext *>();
 385             futex_map.insert(std::pair< uint64_t,
 386                             std::list<ThreadContext *> * >(uaddr, tcWaitList));
 387         }
 388         tcWaitList->push_back(tc);
 389         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
 390                                 "thread context\n");
 391         tc->suspend();
 392         return 0;
 393     } else if (op == OS::TGT_FUTEX_WAKE){
 394         int wokenUp = 0;
 395         std::list<ThreadContext *> * tcWaitList;
 396         if (futex_map.count(uaddr)) {
 397             tcWaitList = futex_map.find(uaddr)->second;
 398             while (tcWaitList->size() > 0 && wokenUp < val) {
 399                 tcWaitList->front()->activate();
 400                 tcWaitList->pop_front();
 401                 wokenUp++;
 402             }
 403             if(tcWaitList->empty()) {
 404                 futex_map.erase(uaddr);
 405                 delete tcWaitList;
 406             }
 407         }
 408         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
 409                                 "thread contexts\n", wokenUp);
 410         return wokenUp;
 411     } else {
 412         warn("sys_futex: op %d is not implemented, just returning...");
 413         return 0;
 414     }
 415
 416 }
 417
 418
 419 /// Pseudo Funcs  - These functions use a different return convension,
 420 /// returning a second value in a register other than the normal return register
 421 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 422                              LiveProcess *process, ThreadContext *tc);
 423
 424 /// Target getpidPseudo() handler.
 425 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 426                                LiveProcess *p, ThreadContext *tc);
 427
 428 /// Target getuidPseudo() handler.
 429 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 430                                LiveProcess *p, ThreadContext *tc);
 431
 432 /// Target getgidPseudo() handler.
 433 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 434                                LiveProcess *p, ThreadContext *tc);
 435
 436
 437 /// A readable name for 1,000,000, for converting microseconds to seconds.
 438 const int one_million = 1000000;
 439
 440 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 441 /// by my reckoning.  We want to keep this a constant (not use the
 442 /// real-world time) to keep simulations repeatable.
 443 const unsigned seconds_since_epoch = 1000000000;
 444
 445 /// Helper function to convert current elapsed time to seconds and
 446 /// microseconds.
 447 template <class T1, class T2>
 448 void
 449 getElapsedTime(T1 &sec, T2 &usec)
 450 {
 451     int elapsed_usecs = curTick() / SimClock::Int::us;
 452     sec = elapsed_usecs / one_million;
 453     usec = elapsed_usecs % one_million;
 454 }
 455
 456 //////////////////////////////////////////////////////////////////////
 457 //
 458 // The following emulation functions are generic, but need to be
 459 // templated to account for differences in types, constants, etc.
 460 //
 461 //////////////////////////////////////////////////////////////////////
 462
 463 #if NO_STAT64
 464     typedef struct stat hst_stat;
 465     typedef struct stat hst_stat64;
 466 #else
 467     typedef struct stat hst_stat;
 468     typedef struct stat64 hst_stat64;
 469 #endif
 470
 471 //// Helper function to convert a host stat buffer to a target stat
 472 //// buffer.  Also copies the target buffer out to the simulated
 473 //// memory space.  Used by stat(), fstat(), and lstat().
 474
 475 template <typename target_stat, typename host_stat>
 476 static void
 477 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 478 {
 479     using namespace TheISA;
 480
 481     if (fakeTTY)
 482         tgt->st_dev = 0xA;
 483     else
 484         tgt->st_dev = host->st_dev;
 485     tgt->st_dev = TheISA::htog(tgt->st_dev);
 486     tgt->st_ino = host->st_ino;
 487     tgt->st_ino = TheISA::htog(tgt->st_ino);
 488     tgt->st_mode = host->st_mode;
 489     if (fakeTTY) {
 490         // Claim to be a character device
 491         tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
 492         tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
 493     }
 494     tgt->st_mode = TheISA::htog(tgt->st_mode);
 495     tgt->st_nlink = host->st_nlink;
 496     tgt->st_nlink = TheISA::htog(tgt->st_nlink);
 497     tgt->st_uid = host->st_uid;
 498     tgt->st_uid = TheISA::htog(tgt->st_uid);
 499     tgt->st_gid = host->st_gid;
 500     tgt->st_gid = TheISA::htog(tgt->st_gid);
 501     if (fakeTTY)
 502         tgt->st_rdev = 0x880d;
 503     else
 504         tgt->st_rdev = host->st_rdev;
 505     tgt->st_rdev = TheISA::htog(tgt->st_rdev);
 506     tgt->st_size = host->st_size;
 507     tgt->st_size = TheISA::htog(tgt->st_size);
 508     tgt->st_atimeX = host->st_atime;
 509     tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
 510     tgt->st_mtimeX = host->st_mtime;
 511     tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
 512     tgt->st_ctimeX = host->st_ctime;
 513     tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
 514     // Force the block size to be 8k. This helps to ensure buffered io works
 515     // consistently across different hosts.
 516     tgt->st_blksize = 0x2000;
 517     tgt->st_blksize = TheISA::htog(tgt->st_blksize);
 518     tgt->st_blocks = host->st_blocks;
 519     tgt->st_blocks = TheISA::htog(tgt->st_blocks);
 520 }
 521
 522 // Same for stat64
 523
 524 template <typename target_stat, typename host_stat64>
 525 static void
 526 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 527 {
 528     using namespace TheISA;
 529
 530     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 531 #if defined(STAT_HAVE_NSEC)
 532     tgt->st_atime_nsec = host->st_atime_nsec;
 533     tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
 534     tgt->st_mtime_nsec = host->st_mtime_nsec;
 535     tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
 536     tgt->st_ctime_nsec = host->st_ctime_nsec;
 537     tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
 538 #else
 539     tgt->st_atime_nsec = 0;
 540     tgt->st_mtime_nsec = 0;
 541     tgt->st_ctime_nsec = 0;
 542 #endif
 543 }
 544
 545 //Here are a couple convenience functions
 546 template<class OS>
 547 static void
 548 copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
 549         hst_stat *host, bool fakeTTY = false)
 550 {
 551     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 552     tgt_stat_buf tgt(addr);
 553     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 554     tgt.copyOut(mem);
 555 }
 556
 557 template<class OS>
 558 static void
 559 copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
 560         hst_stat64 *host, bool fakeTTY = false)
 561 {
 562     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 563     tgt_stat_buf tgt(addr);
 564     convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 565     tgt.copyOut(mem);
 566 }
 567
 568 /// Target ioctl() handler.  For the most part, programs call ioctl()
 569 /// only to find out if their stdout is a tty, to determine whether to
 570 /// do line or block buffering.  We always claim that output fds are
 571 /// not TTYs to provide repeatable results.
 572 template <class OS>
 573 SyscallReturn
 574 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 575           ThreadContext *tc)
 576 {
 577     int index = 0;
 578     int fd = process->getSyscallArg(tc, index);
 579     unsigned req = process->getSyscallArg(tc, index);
 580
 581     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 582
 583     if (fd < 0 || process->sim_fd(fd) < 0) {
 584         // doesn't map to any simulator fd: not a valid target fd
 585         return -EBADF;
 586     }
 587
 588     if (OS::isTtyReq(req)) {
 589         return -ENOTTY;
 590     }
 591
 592     warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
 593          fd, req, tc->pcState());
 594     return -ENOTTY;
 595 }
 596
 597 /// Target open() handler.
 598 template <class OS>
 599 SyscallReturn
 600 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 601          ThreadContext *tc)
 602 {
 603     std::string path;
 604
 605     int index = 0;
 606     if (!tc->getMemProxy().tryReadString(path,
 607                 process->getSyscallArg(tc, index)))
 608         return -EFAULT;
 609
 610     if (path == "/dev/sysdev0") {
 611         // This is a memory-mapped high-resolution timer device on Alpha.
 612         // We don't support it, so just punt.
 613         warn("Ignoring open(%s, ...)\n", path);
 614         return -ENOENT;
 615     }
 616
 617     int tgtFlags = process->getSyscallArg(tc, index);
 618     int mode = process->getSyscallArg(tc, index);
 619     int hostFlags = 0;
 620
 621     // translate open flags
 622     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 623         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 624             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 625             hostFlags |= OS::openFlagTable[i].hostFlag;
 626         }
 627     }
 628
 629     // any target flags left?
 630     if (tgtFlags != 0)
 631         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 632
 633 #ifdef __CYGWIN32__
 634     hostFlags |= O_BINARY;
 635 #endif
 636
 637     // Adjust path for current working directory
 638     path = process->fullPath(path);
 639
 640     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 641
 642     int fd;
 643     int local_errno;
 644     if (startswith(path, "/proc/") || startswith(path, "/system/") ||
 645         startswith(path, "/platform/") || startswith(path, "/sys/")) {
 646         // It's a proc/sys entry and requires special handling
 647         fd = OS::openSpecialFile(path, process, tc);
 648         local_errno = ENOENT;
 649      } else {
 650         // open the file
 651         fd = open(path.c_str(), hostFlags, mode);
 652         local_errno = errno;
 653      }
 654
 655     if (fd == -1)
 656         return -local_errno;
 657
 658     return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
 659 }
 660
 661 /// Target sysinfo() handler.
 662 template <class OS>
 663 SyscallReturn
 664 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 665          ThreadContext *tc)
 666 {
 667
 668     int index = 0;
 669     TypedBufferArg<typename OS::tgt_sysinfo>
 670         sysinfo(process->getSyscallArg(tc, index));
 671
 672     sysinfo->uptime=seconds_since_epoch;
 673     sysinfo->totalram=process->system->memSize();
 674
 675     sysinfo.copyOut(tc->getMemProxy());
 676
 677     return 0;
 678 }
 679
 680 /// Target chmod() handler.
 681 template <class OS>
 682 SyscallReturn
 683 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 684           ThreadContext *tc)
 685 {
 686     std::string path;
 687
 688     int index = 0;
 689     if (!tc->getMemProxy().tryReadString(path,
 690                 process->getSyscallArg(tc, index))) {
 691         return -EFAULT;
 692     }
 693
 694     uint32_t mode = process->getSyscallArg(tc, index);
 695     mode_t hostMode = 0;
 696
 697     // XXX translate mode flags via OS::something???
 698     hostMode = mode;
 699
 700     // Adjust path for current working directory
 701     path = process->fullPath(path);
 702
 703     // do the chmod
 704     int result = chmod(path.c_str(), hostMode);
 705     if (result < 0)
 706         return -errno;
 707
 708     return 0;
 709 }
 710
 711
 712 /// Target fchmod() handler.
 713 template <class OS>
 714 SyscallReturn
 715 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 716            ThreadContext *tc)
 717 {
 718     int index = 0;
 719     int fd = process->getSyscallArg(tc, index);
 720     if (fd < 0 || process->sim_fd(fd) < 0) {
 721         // doesn't map to any simulator fd: not a valid target fd
 722         return -EBADF;
 723     }
 724
 725     uint32_t mode = process->getSyscallArg(tc, index);
 726     mode_t hostMode = 0;
 727
 728     // XXX translate mode flags via OS::someting???
 729     hostMode = mode;
 730
 731     // do the fchmod
 732     int result = fchmod(process->sim_fd(fd), hostMode);
 733     if (result < 0)
 734         return -errno;
 735
 736     return 0;
 737 }
 738
 739 /// Target mremap() handler.
 740 template <class OS>
 741 SyscallReturn
 742 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
 743 {
 744     int index = 0;
 745     Addr start = process->getSyscallArg(tc, index);
 746     uint64_t old_length = process->getSyscallArg(tc, index);
 747     uint64_t new_length = process->getSyscallArg(tc, index);
 748     uint64_t flags = process->getSyscallArg(tc, index);
 749
 750     if ((start % TheISA::VMPageSize != 0) ||
 751             (new_length % TheISA::VMPageSize != 0)) {
 752         warn("mremap failing: arguments not page aligned");
 753         return -EINVAL;
 754     }
 755
 756     if (new_length > old_length) {
 757         if ((start + old_length) == process->mmap_end) {
 758             uint64_t diff = new_length - old_length;
 759             process->allocateMem(process->mmap_end, diff);
 760             process->mmap_end += diff;
 761             return start;
 762         } else {
 763             // sys/mman.h defined MREMAP_MAYMOVE
 764             if (!(flags & 1)) {
 765                 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
 766                 return -ENOMEM;
 767             } else {
 768                 process->pTable->remap(start, old_length, process->mmap_end);
 769                 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
 770                         process->mmap_end, process->mmap_end + new_length, new_length);
 771                 start = process->mmap_end;
 772                 // add on the remaining unallocated pages
 773                 process->allocateMem(start + old_length,
 774                                      new_length - old_length);
 775                 process->mmap_end += new_length;
 776                 warn("returning %08p as start\n", start);
 777                 return start;
 778             }
 779         }
 780     } else {
 781         process->pTable->unmap(start + new_length, old_length - new_length);
 782         return start;
 783     }
 784 }
 785
 786 /// Target stat() handler.
 787 template <class OS>
 788 SyscallReturn
 789 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 790          ThreadContext *tc)
 791 {
 792     std::string path;
 793
 794     int index = 0;
 795     if (!tc->getMemProxy().tryReadString(path,
 796                 process->getSyscallArg(tc, index))) {
 797         return -EFAULT;
 798     }
 799     Addr bufPtr = process->getSyscallArg(tc, index);
 800
 801     // Adjust path for current working directory
 802     path = process->fullPath(path);
 803
 804     struct stat hostBuf;
 805     int result = stat(path.c_str(), &hostBuf);
 806
 807     if (result < 0)
 808         return -errno;
 809
 810     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 811
 812     return 0;
 813 }
 814
 815
 816 /// Target stat64() handler.
 817 template <class OS>
 818 SyscallReturn
 819 stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 820            ThreadContext *tc)
 821 {
 822     std::string path;
 823
 824     int index = 0;
 825     if (!tc->getMemProxy().tryReadString(path,
 826                 process->getSyscallArg(tc, index)))
 827         return -EFAULT;
 828     Addr bufPtr = process->getSyscallArg(tc, index);
 829
 830     // Adjust path for current working directory
 831     path = process->fullPath(path);
 832
 833 #if NO_STAT64
 834     struct stat  hostBuf;
 835     int result = stat(path.c_str(), &hostBuf);
 836 #else
 837     struct stat64 hostBuf;
 838     int result = stat64(path.c_str(), &hostBuf);
 839 #endif
 840
 841     if (result < 0)
 842         return -errno;
 843
 844     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 845
 846     return 0;
 847 }
 848
 849
 850 /// Target fstat64() handler.
 851 template <class OS>
 852 SyscallReturn
 853 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 854             ThreadContext *tc)
 855 {
 856     int index = 0;
 857     int fd = process->getSyscallArg(tc, index);
 858     Addr bufPtr = process->getSyscallArg(tc, index);
 859     if (fd < 0 || process->sim_fd(fd) < 0) {
 860         // doesn't map to any simulator fd: not a valid target fd
 861         return -EBADF;
 862     }
 863
 864 #if NO_STAT64
 865     struct stat  hostBuf;
 866     int result = fstat(process->sim_fd(fd), &hostBuf);
 867 #else
 868     struct stat64  hostBuf;
 869     int result = fstat64(process->sim_fd(fd), &hostBuf);
 870 #endif
 871
 872     if (result < 0)
 873         return -errno;
 874
 875     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
 876
 877     return 0;
 878 }
 879
 880
 881 /// Target lstat() handler.
 882 template <class OS>
 883 SyscallReturn
 884 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 885           ThreadContext *tc)
 886 {
 887     std::string path;
 888
 889     int index = 0;
 890     if (!tc->getMemProxy().tryReadString(path,
 891                 process->getSyscallArg(tc, index))) {
 892         return -EFAULT;
 893     }
 894     Addr bufPtr = process->getSyscallArg(tc, index);
 895
 896     // Adjust path for current working directory
 897     path = process->fullPath(path);
 898
 899     struct stat hostBuf;
 900     int result = lstat(path.c_str(), &hostBuf);
 901
 902     if (result < 0)
 903         return -errno;
 904
 905     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 906
 907     return 0;
 908 }
 909
 910 /// Target lstat64() handler.
 911 template <class OS>
 912 SyscallReturn
 913 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 914             ThreadContext *tc)
 915 {
 916     std::string path;
 917
 918     int index = 0;
 919     if (!tc->getMemProxy().tryReadString(path,
 920                 process->getSyscallArg(tc, index))) {
 921         return -EFAULT;
 922     }
 923     Addr bufPtr = process->getSyscallArg(tc, index);
 924
 925     // Adjust path for current working directory
 926     path = process->fullPath(path);
 927
 928 #if NO_STAT64
 929     struct stat hostBuf;
 930     int result = lstat(path.c_str(), &hostBuf);
 931 #else
 932     struct stat64 hostBuf;
 933     int result = lstat64(path.c_str(), &hostBuf);
 934 #endif
 935
 936     if (result < 0)
 937         return -errno;
 938
 939     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 940
 941     return 0;
 942 }
 943
 944 /// Target fstat() handler.
 945 template <class OS>
 946 SyscallReturn
 947 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 948           ThreadContext *tc)
 949 {
 950     int index = 0;
 951     int fd = process->sim_fd(process->getSyscallArg(tc, index));
 952     Addr bufPtr = process->getSyscallArg(tc, index);
 953
 954     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
 955
 956     if (fd < 0)
 957         return -EBADF;
 958
 959     struct stat hostBuf;
 960     int result = fstat(fd, &hostBuf);
 961
 962     if (result < 0)
 963         return -errno;
 964
 965     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
 966
 967     return 0;
 968 }
 969
 970
 971 /// Target statfs() handler.
 972 template <class OS>
 973 SyscallReturn
 974 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 975            ThreadContext *tc)
 976 {
 977     std::string path;
 978
 979     int index = 0;
 980     if (!tc->getMemProxy().tryReadString(path,
 981                 process->getSyscallArg(tc, index))) {
 982         return -EFAULT;
 983     }
 984     Addr bufPtr = process->getSyscallArg(tc, index);
 985
 986     // Adjust path for current working directory
 987     path = process->fullPath(path);
 988
 989     struct statfs hostBuf;
 990     int result = statfs(path.c_str(), &hostBuf);
 991
 992     if (result < 0)
 993         return -errno;
 994
 995     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
 996
 997     return 0;
 998 }
 999
1000
1001 /// Target fstatfs() handler.
1002 template <class OS>
1003 SyscallReturn
1004 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1005             ThreadContext *tc)
1006 {
1007     int index = 0;
1008     int fd = process->sim_fd(process->getSyscallArg(tc, index));
1009     Addr bufPtr = process->getSyscallArg(tc, index);
1010
1011     if (fd < 0)
1012         return -EBADF;
1013
1014     struct statfs hostBuf;
1015     int result = fstatfs(fd, &hostBuf);
1016
1017     if (result < 0)
1018         return -errno;
1019
1020     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1021
1022     return 0;
1023 }
1024
1025
1026 /// Target writev() handler.
1027 template <class OS>
1028 SyscallReturn
1029 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1030            ThreadContext *tc)
1031 {
1032     int index = 0;
1033     int fd = process->getSyscallArg(tc, index);
1034     if (fd < 0 || process->sim_fd(fd) < 0) {
1035         // doesn't map to any simulator fd: not a valid target fd
1036         return -EBADF;
1037     }
1038
1039     SETranslatingPortProxy &p = tc->getMemProxy();
1040     uint64_t tiov_base = process->getSyscallArg(tc, index);
1041     size_t count = process->getSyscallArg(tc, index);
1042     struct iovec hiov[count];
1043     for (size_t i = 0; i < count; ++i) {
1044         typename OS::tgt_iovec tiov;
1045
1046         p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1047                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1048         hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1049         hiov[i].iov_base = new char [hiov[i].iov_len];
1050         p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1051                    hiov[i].iov_len);
1052     }
1053
1054     int result = writev(process->sim_fd(fd), hiov, count);
1055
1056     for (size_t i = 0; i < count; ++i)
1057         delete [] (char *)hiov[i].iov_base;
1058
1059     if (result < 0)
1060         return -errno;
1061
1062     return 0;
1063 }
1064
1065
1066 /// Target mmap() handler.
1067 ///
1068 /// We don't really handle mmap().  If the target is mmaping an
1069 /// anonymous region or /dev/zero, we can get away with doing basically
1070 /// nothing (since memory is initialized to zero and the simulator
1071 /// doesn't really check addresses anyway).
1072 ///
1073 template <class OS>
1074 SyscallReturn
1075 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1076 {
1077     int index = 0;
1078     Addr start = p->getSyscallArg(tc, index);
1079     uint64_t length = p->getSyscallArg(tc, index);
1080     index++; // int prot = p->getSyscallArg(tc, index);
1081     int flags = p->getSyscallArg(tc, index);
1082     int tgt_fd = p->getSyscallArg(tc, index);
1083     // int offset = p->getSyscallArg(tc, index);
1084
1085     if (length > 0x100000000ULL)
1086         warn("mmap length argument %#x is unreasonably large.\n", length);
1087
1088     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1089         Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1090         if (!fd_map || fd_map->fd < 0) {
1091             warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1092             return -EBADF;
1093         }
1094
1095         if (fd_map->filename != "/dev/zero") {
1096             // This is very likely broken, but leave a warning here
1097             // (rather than panic) in case /dev/zero is known by
1098             // another name on some platform
1099             warn("allowing mmap of file %s; mmap not supported on files"
1100                  " other than /dev/zero\n", fd_map->filename);
1101         }
1102     }
1103
1104     if ((start  % TheISA::VMPageSize) != 0 ||
1105         (length % TheISA::VMPageSize) != 0) {
1106         warn("mmap failing: arguments not page-aligned: "
1107              "start 0x%x length 0x%x",
1108              start, length);
1109         return -EINVAL;
1110     }
1111
1112     // are we ok with clobbering existing mappings?  only set this to
1113     // true if the user has been warned.
1114     bool clobber = false;
1115
1116     // try to use the caller-provided address if there is one
1117     bool use_provided_address = (start != 0);
1118
1119     if (use_provided_address) {
1120         // check to see if the desired address is already in use
1121         if (!p->pTable->isUnmapped(start, length)) {
1122             // there are existing mappings in the desired range
1123             // whether we clobber them or not depends on whether the caller
1124             // specified MAP_FIXED
1125             if (flags & OS::TGT_MAP_FIXED) {
1126                 // MAP_FIXED specified: clobber existing mappings
1127                 warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
1128                      start);
1129                 clobber = true;
1130             } else {
1131                 // MAP_FIXED not specified: ignore suggested start address
1132                 warn("mmap: ignoring suggested map address 0x%x\n", start);
1133                 use_provided_address = false;
1134             }
1135         }
1136     }
1137
1138     if (!use_provided_address) {
1139         // no address provided, or provided address unusable:
1140         // pick next address from our "mmap region"
1141         if (OS::mmapGrowsDown()) {
1142             start = p->mmap_end - length;
1143             p->mmap_end = start;
1144         } else {
1145             start = p->mmap_end;
1146             p->mmap_end += length;
1147         }
1148     }
1149
1150     p->allocateMem(start, length, clobber);
1151
1152     return start;
1153 }
1154
1155 /// Target getrlimit() handler.
1156 template <class OS>
1157 SyscallReturn
1158 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1159         ThreadContext *tc)
1160 {
1161     int index = 0;
1162     unsigned resource = process->getSyscallArg(tc, index);
1163     TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1164
1165     switch (resource) {
1166         case OS::TGT_RLIMIT_STACK:
1167             // max stack size in bytes: make up a number (8MB for now)
1168             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1169             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1170             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1171             break;
1172
1173         case OS::TGT_RLIMIT_DATA:
1174             // max data segment size in bytes: make up a number
1175             rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1176             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1177             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1178             break;
1179
1180         default:
1181             std::cerr << "getrlimitFunc: unimplemented resource " << resource
1182                 << std::endl;
1183             abort();
1184             break;
1185     }
1186
1187     rlp.copyOut(tc->getMemProxy());
1188     return 0;
1189 }
1190
1191 /// Target gettimeofday() handler.
1192 template <class OS>
1193 SyscallReturn
1194 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1195         ThreadContext *tc)
1196 {
1197     int index = 0;
1198     TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1199
1200     getElapsedTime(tp->tv_sec, tp->tv_usec);
1201     tp->tv_sec += seconds_since_epoch;
1202     tp->tv_sec = TheISA::htog(tp->tv_sec);
1203     tp->tv_usec = TheISA::htog(tp->tv_usec);
1204
1205     tp.copyOut(tc->getMemProxy());
1206
1207     return 0;
1208 }
1209
1210
1211 /// Target utimes() handler.
1212 template <class OS>
1213 SyscallReturn
1214 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1215            ThreadContext *tc)
1216 {
1217     std::string path;
1218
1219     int index = 0;
1220     if (!tc->getMemProxy().tryReadString(path,
1221                 process->getSyscallArg(tc, index))) {
1222         return -EFAULT;
1223     }
1224
1225     TypedBufferArg<typename OS::timeval [2]>
1226         tp(process->getSyscallArg(tc, index));
1227     tp.copyIn(tc->getMemProxy());
1228
1229     struct timeval hostTimeval[2];
1230     for (int i = 0; i < 2; ++i)
1231     {
1232         hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1233         hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1234     }
1235
1236     // Adjust path for current working directory
1237     path = process->fullPath(path);
1238
1239     int result = utimes(path.c_str(), hostTimeval);
1240
1241     if (result < 0)
1242         return -errno;
1243
1244     return 0;
1245 }
1246 /// Target getrusage() function.
1247 template <class OS>
1248 SyscallReturn
1249 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1250               ThreadContext *tc)
1251 {
1252     int index = 0;
1253     int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1254     TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1255
1256     rup->ru_utime.tv_sec = 0;
1257     rup->ru_utime.tv_usec = 0;
1258     rup->ru_stime.tv_sec = 0;
1259     rup->ru_stime.tv_usec = 0;
1260     rup->ru_maxrss = 0;
1261     rup->ru_ixrss = 0;
1262     rup->ru_idrss = 0;
1263     rup->ru_isrss = 0;
1264     rup->ru_minflt = 0;
1265     rup->ru_majflt = 0;
1266     rup->ru_nswap = 0;
1267     rup->ru_inblock = 0;
1268     rup->ru_oublock = 0;
1269     rup->ru_msgsnd = 0;
1270     rup->ru_msgrcv = 0;
1271     rup->ru_nsignals = 0;
1272     rup->ru_nvcsw = 0;
1273     rup->ru_nivcsw = 0;
1274
1275     switch (who) {
1276       case OS::TGT_RUSAGE_SELF:
1277         getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1278         rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1279         rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1280         break;
1281
1282       case OS::TGT_RUSAGE_CHILDREN:
1283         // do nothing.  We have no child processes, so they take no time.
1284         break;
1285
1286       default:
1287         // don't really handle THREAD or CHILDREN, but just warn and
1288         // plow ahead
1289         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1290              who);
1291     }
1292
1293     rup.copyOut(tc->getMemProxy());
1294
1295     return 0;
1296 }
1297
1298 /// Target times() function.
1299 template <class OS>
1300 SyscallReturn
1301 timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1302            ThreadContext *tc)
1303 {
1304     int index = 0;
1305     TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1306
1307     // Fill in the time structure (in clocks)
1308     int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1309     bufp->tms_utime = clocks;
1310     bufp->tms_stime = 0;
1311     bufp->tms_cutime = 0;
1312     bufp->tms_cstime = 0;
1313
1314     // Convert to host endianness
1315     bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1316
1317     // Write back
1318     bufp.copyOut(tc->getMemProxy());
1319
1320     // Return clock ticks since system boot
1321     return clocks;
1322 }
1323
1324 /// Target time() function.
1325 template <class OS>
1326 SyscallReturn
1327 timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1328            ThreadContext *tc)
1329 {
1330     typename OS::time_t sec, usec;
1331     getElapsedTime(sec, usec);
1332     sec += seconds_since_epoch;
1333
1334     int index = 0;
1335     Addr taddr = (Addr)process->getSyscallArg(tc, index);
1336     if(taddr != 0) {
1337         typename OS::time_t t = sec;
1338         t = TheISA::htog(t);
1339         SETranslatingPortProxy &p = tc->getMemProxy();
1340         p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1341     }
1342     return sec;
1343 }
1344
1345
1346 #endif // __SIM_SYSCALL_EMUL_HH__