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   defined(__NetBSD__))
  38
  39 ///
  40 /// @file syscall_emul.hh
  41 ///
  42 /// This file defines objects used to emulate syscalls from the target
  43 /// application on the host machine.
  44
  45 #ifdef __CYGWIN32__
  46 #include <sys/fcntl.h>  // for O_BINARY
  47 #endif
  48 #include <sys/stat.h>
  49 #include <sys/time.h>
  50 #include <sys/uio.h>
  51 #include <fcntl.h>
  52
  53 #include <cerrno>
  54 #include <string>
  55
  56 #include "base/chunk_generator.hh"
  57 #include "base/intmath.hh"      // for RoundUp
  58 #include "base/misc.hh"
  59 #include "base/trace.hh"
  60 #include "base/types.hh"
  61 #include "config/the_isa.hh"
  62 #include "cpu/base.hh"
  63 #include "cpu/thread_context.hh"
  64 #include "debug/SyscallVerbose.hh"
  65 #include "mem/page_table.hh"
  66 #include "mem/se_translating_port_proxy.hh"
  67 #include "sim/byteswap.hh"
  68 #include "sim/process.hh"
  69 #include "sim/syscallreturn.hh"
  70 #include "sim/system.hh"
  71
  72 ///
  73 /// System call descriptor.
  74 ///
  75 class SyscallDesc {
  76
  77   public:
  78
  79     /// Typedef for target syscall handler functions.
  80     typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
  81                            LiveProcess *, ThreadContext *);
  82
  83     const char *name;   //!< Syscall name (e.g., "open").
  84     FuncPtr funcPtr;    //!< Pointer to emulation function.
  85     int flags;          //!< Flags (see Flags enum).
  86
  87     /// Flag values for controlling syscall behavior.
  88     enum Flags {
  89         /// Don't set return regs according to funcPtr return value.
  90         /// Used for syscalls with non-standard return conventions
  91         /// that explicitly set the ThreadContext regs (e.g.,
  92         /// sigreturn).
  93         SuppressReturnValue = 1
  94     };
  95
  96     /// Constructor.
  97     SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
  98         : name(_name), funcPtr(_funcPtr), flags(_flags)
  99     {
 100     }
 101
 102     /// Emulate the syscall.  Public interface for calling through funcPtr.
 103     void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
 104 };
 105
 106
 107 class BaseBufferArg {
 108
 109   public:
 110
 111     BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
 112     {
 113         bufPtr = new uint8_t[size];
 114         // clear out buffer: in case we only partially populate this,
 115         // and then do a copyOut(), we want to make sure we don't
 116         // introduce any random junk into the simulated address space
 117         memset(bufPtr, 0, size);
 118     }
 119
 120     virtual ~BaseBufferArg() { delete [] bufPtr; }
 121
 122     //
 123     // copy data into simulator space (read from target memory)
 124     //
 125     virtual bool copyIn(SETranslatingPortProxy &memproxy)
 126     {
 127         memproxy.readBlob(addr, bufPtr, size);
 128         return true;    // no EFAULT detection for now
 129     }
 130
 131     //
 132     // copy data out of simulator space (write to target memory)
 133     //
 134     virtual bool copyOut(SETranslatingPortProxy &memproxy)
 135     {
 136         memproxy.writeBlob(addr, bufPtr, size);
 137         return true;    // no EFAULT detection for now
 138     }
 139
 140   protected:
 141     Addr addr;
 142     int size;
 143     uint8_t *bufPtr;
 144 };
 145
 146
 147 class BufferArg : public BaseBufferArg
 148 {
 149   public:
 150     BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
 151     void *bufferPtr()   { return bufPtr; }
 152 };
 153
 154 template <class T>
 155 class TypedBufferArg : public BaseBufferArg
 156 {
 157   public:
 158     // user can optionally specify a specific number of bytes to
 159     // allocate to deal with those structs that have variable-size
 160     // arrays at the end
 161     TypedBufferArg(Addr _addr, int _size = sizeof(T))
 162         : BaseBufferArg(_addr, _size)
 163     { }
 164
 165     // type case
 166     operator T*() { return (T *)bufPtr; }
 167
 168     // dereference operators
 169     T &operator*()       { return *((T *)bufPtr); }
 170     T* operator->()      { return (T *)bufPtr; }
 171     T &operator[](int i) { return ((T *)bufPtr)[i]; }
 172 };
 173
 174 //////////////////////////////////////////////////////////////////////
 175 //
 176 // The following emulation functions are generic enough that they
 177 // don't need to be recompiled for different emulated OS's.  They are
 178 // defined in sim/syscall_emul.cc.
 179 //
 180 //////////////////////////////////////////////////////////////////////
 181
 182
 183 /// Handler for unimplemented syscalls that we haven't thought about.
 184 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 185                                 LiveProcess *p, ThreadContext *tc);
 186
 187 /// Handler for unimplemented syscalls that we never intend to
 188 /// implement (signal handling, etc.) and should not affect the correct
 189 /// behavior of the program.  Print a warning only if the appropriate
 190 /// trace flag is enabled.  Return success to the target program.
 191 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 192                          LiveProcess *p, ThreadContext *tc);
 193 SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
 194                          LiveProcess *p, ThreadContext *tc);
 195
 196 /// Target exit() handler: terminate current context.
 197 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 198                        LiveProcess *p, ThreadContext *tc);
 199
 200 /// Target exit_group() handler: terminate simulation. (exit all threads)
 201 SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
 202                        LiveProcess *p, ThreadContext *tc);
 203
 204 /// Target getpagesize() handler.
 205 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 206                               LiveProcess *p, ThreadContext *tc);
 207
 208 /// Target brk() handler: set brk address.
 209 SyscallReturn brkFunc(SyscallDesc *desc, int num,
 210                       LiveProcess *p, ThreadContext *tc);
 211
 212 /// Target close() handler.
 213 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 214                         LiveProcess *p, ThreadContext *tc);
 215
 216 /// Target read() handler.
 217 SyscallReturn readFunc(SyscallDesc *desc, int num,
 218                        LiveProcess *p, ThreadContext *tc);
 219
 220 /// Target write() handler.
 221 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 222                         LiveProcess *p, ThreadContext *tc);
 223
 224 /// Target lseek() handler.
 225 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 226                         LiveProcess *p, ThreadContext *tc);
 227
 228 /// Target _llseek() handler.
 229 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
 230                         LiveProcess *p, ThreadContext *tc);
 231
 232 /// Target munmap() handler.
 233 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 234                          LiveProcess *p, ThreadContext *tc);
 235
 236 /// Target gethostname() handler.
 237 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 238                               LiveProcess *p, ThreadContext *tc);
 239
 240 /// Target getcwd() handler.
 241 SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
 242                          LiveProcess *p, ThreadContext *tc);
 243
 244 /// Target unlink() handler.
 245 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 246                            LiveProcess *p, ThreadContext *tc);
 247
 248 /// Target unlink() handler.
 249 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 250                          LiveProcess *p, ThreadContext *tc);
 251
 252 /// Target mkdir() handler.
 253 SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
 254                         LiveProcess *p, ThreadContext *tc);
 255
 256 /// Target rename() handler.
 257 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 258                          LiveProcess *p, ThreadContext *tc);
 259
 260
 261 /// Target truncate() handler.
 262 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 263                            LiveProcess *p, ThreadContext *tc);
 264
 265
 266 /// Target ftruncate() handler.
 267 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 268                             LiveProcess *p, ThreadContext *tc);
 269
 270
 271 /// Target truncate64() handler.
 272 SyscallReturn truncate64Func(SyscallDesc *desc, int num,
 273                              LiveProcess *p, ThreadContext *tc);
 274
 275 /// Target ftruncate64() handler.
 276 SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
 277                               LiveProcess *p, ThreadContext *tc);
 278
 279
 280 /// Target umask() handler.
 281 SyscallReturn umaskFunc(SyscallDesc *desc, int num,
 282                         LiveProcess *p, ThreadContext *tc);
 283
 284
 285 /// Target chown() handler.
 286 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 287                         LiveProcess *p, ThreadContext *tc);
 288
 289
 290 /// Target fchown() handler.
 291 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 292                          LiveProcess *p, ThreadContext *tc);
 293
 294 /// Target dup() handler.
 295 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 296                       LiveProcess *process, ThreadContext *tc);
 297
 298 /// Target fnctl() handler.
 299 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 300                         LiveProcess *process, ThreadContext *tc);
 301
 302 /// Target fcntl64() handler.
 303 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 304                         LiveProcess *process, ThreadContext *tc);
 305
 306 /// Target setuid() handler.
 307 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 308                                LiveProcess *p, ThreadContext *tc);
 309
 310 /// Target getpid() handler.
 311 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 312                                LiveProcess *p, ThreadContext *tc);
 313
 314 /// Target getuid() handler.
 315 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 316                                LiveProcess *p, ThreadContext *tc);
 317
 318 /// Target getgid() handler.
 319 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 320                                LiveProcess *p, ThreadContext *tc);
 321
 322 /// Target getppid() handler.
 323 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 324                                LiveProcess *p, ThreadContext *tc);
 325
 326 /// Target geteuid() handler.
 327 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 328                                LiveProcess *p, ThreadContext *tc);
 329
 330 /// Target getegid() handler.
 331 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 332                                LiveProcess *p, ThreadContext *tc);
 333
 334 /// Target clone() handler.
 335 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
 336                                LiveProcess *p, ThreadContext *tc);
 337
 338 /// Futex system call
 339 ///  Implemented by Daniel Sanchez
 340 ///  Used by printf's in multi-threaded apps
 341 template <class OS>
 342 SyscallReturn
 343 futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 344           ThreadContext *tc)
 345 {
 346     int index_uaddr = 0;
 347     int index_op = 1;
 348     int index_val = 2;
 349     int index_timeout = 3;
 350
 351     uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
 352     int op = process->getSyscallArg(tc, index_op);
 353     int val = process->getSyscallArg(tc, index_val);
 354     uint64_t timeout = process->getSyscallArg(tc, index_timeout);
 355
 356     std::map<uint64_t, std::list<ThreadContext *> * >
 357         &futex_map = tc->getSystemPtr()->futexMap;
 358
 359     DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
 360             uaddr, op, val);
 361
 362     op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
 363
 364     if (op == OS::TGT_FUTEX_WAIT) {
 365         if (timeout != 0) {
 366             warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
 367                  "we'll wait indefinitely");
 368         }
 369
 370         uint8_t *buf = new uint8_t[sizeof(int)];
 371         tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
 372         int mem_val = *((int *)buf);
 373         delete buf;
 374
 375         if(val != mem_val) {
 376             DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
 377                                     "expected: %d\n", mem_val, val);
 378             return -OS::TGT_EWOULDBLOCK;
 379         }
 380
 381         // Queue the thread context
 382         std::list<ThreadContext *> * tcWaitList;
 383         if (futex_map.count(uaddr)) {
 384             tcWaitList = futex_map.find(uaddr)->second;
 385         } else {
 386             tcWaitList = new std::list<ThreadContext *>();
 387             futex_map.insert(std::pair< uint64_t,
 388                             std::list<ThreadContext *> * >(uaddr, tcWaitList));
 389         }
 390         tcWaitList->push_back(tc);
 391         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
 392                                 "thread context\n");
 393         tc->suspend();
 394         return 0;
 395     } else if (op == OS::TGT_FUTEX_WAKE){
 396         int wokenUp = 0;
 397         std::list<ThreadContext *> * tcWaitList;
 398         if (futex_map.count(uaddr)) {
 399             tcWaitList = futex_map.find(uaddr)->second;
 400             while (tcWaitList->size() > 0 && wokenUp < val) {
 401                 tcWaitList->front()->activate();
 402                 tcWaitList->pop_front();
 403                 wokenUp++;
 404             }
 405             if(tcWaitList->empty()) {
 406                 futex_map.erase(uaddr);
 407                 delete tcWaitList;
 408             }
 409         }
 410         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
 411                                 "thread contexts\n", wokenUp);
 412         return wokenUp;
 413     } else {
 414         warn("sys_futex: op %d is not implemented, just returning...", op);
 415         return 0;
 416     }
 417
 418 }
 419
 420
 421 /// Pseudo Funcs  - These functions use a different return convension,
 422 /// returning a second value in a register other than the normal return register
 423 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 424                              LiveProcess *process, ThreadContext *tc);
 425
 426 /// Target getpidPseudo() handler.
 427 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 428                                LiveProcess *p, ThreadContext *tc);
 429
 430 /// Target getuidPseudo() handler.
 431 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 432                                LiveProcess *p, ThreadContext *tc);
 433
 434 /// Target getgidPseudo() handler.
 435 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 436                                LiveProcess *p, ThreadContext *tc);
 437
 438
 439 /// A readable name for 1,000,000, for converting microseconds to seconds.
 440 const int one_million = 1000000;
 441
 442 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 443 /// by my reckoning.  We want to keep this a constant (not use the
 444 /// real-world time) to keep simulations repeatable.
 445 const unsigned seconds_since_epoch = 1000000000;
 446
 447 /// Helper function to convert current elapsed time to seconds and
 448 /// microseconds.
 449 template <class T1, class T2>
 450 void
 451 getElapsedTime(T1 &sec, T2 &usec)
 452 {
 453     int elapsed_usecs = curTick() / SimClock::Int::us;
 454     sec = elapsed_usecs / one_million;
 455     usec = elapsed_usecs % one_million;
 456 }
 457
 458 //////////////////////////////////////////////////////////////////////
 459 //
 460 // The following emulation functions are generic, but need to be
 461 // templated to account for differences in types, constants, etc.
 462 //
 463 //////////////////////////////////////////////////////////////////////
 464
 465 #if NO_STAT64
 466     typedef struct stat hst_stat;
 467     typedef struct stat hst_stat64;
 468 #else
 469     typedef struct stat hst_stat;
 470     typedef struct stat64 hst_stat64;
 471 #endif
 472
 473 //// Helper function to convert a host stat buffer to a target stat
 474 //// buffer.  Also copies the target buffer out to the simulated
 475 //// memory space.  Used by stat(), fstat(), and lstat().
 476
 477 template <typename target_stat, typename host_stat>
 478 static void
 479 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 480 {
 481     using namespace TheISA;
 482
 483     if (fakeTTY)
 484         tgt->st_dev = 0xA;
 485     else
 486         tgt->st_dev = host->st_dev;
 487     tgt->st_dev = TheISA::htog(tgt->st_dev);
 488     tgt->st_ino = host->st_ino;
 489     tgt->st_ino = TheISA::htog(tgt->st_ino);
 490     tgt->st_mode = host->st_mode;
 491     if (fakeTTY) {
 492         // Claim to be a character device
 493         tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
 494         tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
 495     }
 496     tgt->st_mode = TheISA::htog(tgt->st_mode);
 497     tgt->st_nlink = host->st_nlink;
 498     tgt->st_nlink = TheISA::htog(tgt->st_nlink);
 499     tgt->st_uid = host->st_uid;
 500     tgt->st_uid = TheISA::htog(tgt->st_uid);
 501     tgt->st_gid = host->st_gid;
 502     tgt->st_gid = TheISA::htog(tgt->st_gid);
 503     if (fakeTTY)
 504         tgt->st_rdev = 0x880d;
 505     else
 506         tgt->st_rdev = host->st_rdev;
 507     tgt->st_rdev = TheISA::htog(tgt->st_rdev);
 508     tgt->st_size = host->st_size;
 509     tgt->st_size = TheISA::htog(tgt->st_size);
 510     tgt->st_atimeX = host->st_atime;
 511     tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
 512     tgt->st_mtimeX = host->st_mtime;
 513     tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
 514     tgt->st_ctimeX = host->st_ctime;
 515     tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
 516     // Force the block size to be 8k. This helps to ensure buffered io works
 517     // consistently across different hosts.
 518     tgt->st_blksize = 0x2000;
 519     tgt->st_blksize = TheISA::htog(tgt->st_blksize);
 520     tgt->st_blocks = host->st_blocks;
 521     tgt->st_blocks = TheISA::htog(tgt->st_blocks);
 522 }
 523
 524 // Same for stat64
 525
 526 template <typename target_stat, typename host_stat64>
 527 static void
 528 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 529 {
 530     using namespace TheISA;
 531
 532     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 533 #if defined(STAT_HAVE_NSEC)
 534     tgt->st_atime_nsec = host->st_atime_nsec;
 535     tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
 536     tgt->st_mtime_nsec = host->st_mtime_nsec;
 537     tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
 538     tgt->st_ctime_nsec = host->st_ctime_nsec;
 539     tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
 540 #else
 541     tgt->st_atime_nsec = 0;
 542     tgt->st_mtime_nsec = 0;
 543     tgt->st_ctime_nsec = 0;
 544 #endif
 545 }
 546
 547 //Here are a couple convenience functions
 548 template<class OS>
 549 static void
 550 copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
 551         hst_stat *host, bool fakeTTY = false)
 552 {
 553     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 554     tgt_stat_buf tgt(addr);
 555     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 556     tgt.copyOut(mem);
 557 }
 558
 559 template<class OS>
 560 static void
 561 copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
 562         hst_stat64 *host, bool fakeTTY = false)
 563 {
 564     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 565     tgt_stat_buf tgt(addr);
 566     convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 567     tgt.copyOut(mem);
 568 }
 569
 570 /// Target ioctl() handler.  For the most part, programs call ioctl()
 571 /// only to find out if their stdout is a tty, to determine whether to
 572 /// do line or block buffering.  We always claim that output fds are
 573 /// not TTYs to provide repeatable results.
 574 template <class OS>
 575 SyscallReturn
 576 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 577           ThreadContext *tc)
 578 {
 579     int index = 0;
 580     int fd = process->getSyscallArg(tc, index);
 581     unsigned req = process->getSyscallArg(tc, index);
 582
 583     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 584
 585     if (fd < 0 || process->sim_fd(fd) < 0) {
 586         // doesn't map to any simulator fd: not a valid target fd
 587         return -EBADF;
 588     }
 589
 590     if (OS::isTtyReq(req)) {
 591         return -ENOTTY;
 592     }
 593
 594     warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
 595          fd, req, tc->pcState());
 596     return -ENOTTY;
 597 }
 598
 599 /// Target open() handler.
 600 template <class OS>
 601 SyscallReturn
 602 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 603          ThreadContext *tc)
 604 {
 605     std::string path;
 606
 607     int index = 0;
 608     if (!tc->getMemProxy().tryReadString(path,
 609                 process->getSyscallArg(tc, index)))
 610         return -EFAULT;
 611
 612     if (path == "/dev/sysdev0") {
 613         // This is a memory-mapped high-resolution timer device on Alpha.
 614         // We don't support it, so just punt.
 615         warn("Ignoring open(%s, ...)\n", path);
 616         return -ENOENT;
 617     }
 618
 619     int tgtFlags = process->getSyscallArg(tc, index);
 620     int mode = process->getSyscallArg(tc, index);
 621     int hostFlags = 0;
 622
 623     // translate open flags
 624     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 625         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 626             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 627             hostFlags |= OS::openFlagTable[i].hostFlag;
 628         }
 629     }
 630
 631     // any target flags left?
 632     if (tgtFlags != 0)
 633         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 634
 635 #ifdef __CYGWIN32__
 636     hostFlags |= O_BINARY;
 637 #endif
 638
 639     // Adjust path for current working directory
 640     path = process->fullPath(path);
 641
 642     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 643
 644     int fd;
 645     int local_errno;
 646     if (startswith(path, "/proc/") || startswith(path, "/system/") ||
 647         startswith(path, "/platform/") || startswith(path, "/sys/")) {
 648         // It's a proc/sys entry and requires special handling
 649         fd = OS::openSpecialFile(path, process, tc);
 650         local_errno = ENOENT;
 651      } else {
 652         // open the file
 653         fd = open(path.c_str(), hostFlags, mode);
 654         local_errno = errno;
 655      }
 656
 657     if (fd == -1)
 658         return -local_errno;
 659
 660     return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
 661 }
 662
 663 /// Target sysinfo() handler.
 664 template <class OS>
 665 SyscallReturn
 666 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 667          ThreadContext *tc)
 668 {
 669
 670     int index = 0;
 671     TypedBufferArg<typename OS::tgt_sysinfo>
 672         sysinfo(process->getSyscallArg(tc, index));
 673
 674     sysinfo->uptime=seconds_since_epoch;
 675     sysinfo->totalram=process->system->memSize();
 676
 677     sysinfo.copyOut(tc->getMemProxy());
 678
 679     return 0;
 680 }
 681
 682 /// Target chmod() handler.
 683 template <class OS>
 684 SyscallReturn
 685 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 686           ThreadContext *tc)
 687 {
 688     std::string path;
 689
 690     int index = 0;
 691     if (!tc->getMemProxy().tryReadString(path,
 692                 process->getSyscallArg(tc, index))) {
 693         return -EFAULT;
 694     }
 695
 696     uint32_t mode = process->getSyscallArg(tc, index);
 697     mode_t hostMode = 0;
 698
 699     // XXX translate mode flags via OS::something???
 700     hostMode = mode;
 701
 702     // Adjust path for current working directory
 703     path = process->fullPath(path);
 704
 705     // do the chmod
 706     int result = chmod(path.c_str(), hostMode);
 707     if (result < 0)
 708         return -errno;
 709
 710     return 0;
 711 }
 712
 713
 714 /// Target fchmod() handler.
 715 template <class OS>
 716 SyscallReturn
 717 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 718            ThreadContext *tc)
 719 {
 720     int index = 0;
 721     int fd = process->getSyscallArg(tc, index);
 722     if (fd < 0 || process->sim_fd(fd) < 0) {
 723         // doesn't map to any simulator fd: not a valid target fd
 724         return -EBADF;
 725     }
 726
 727     uint32_t mode = process->getSyscallArg(tc, index);
 728     mode_t hostMode = 0;
 729
 730     // XXX translate mode flags via OS::someting???
 731     hostMode = mode;
 732
 733     // do the fchmod
 734     int result = fchmod(process->sim_fd(fd), hostMode);
 735     if (result < 0)
 736         return -errno;
 737
 738     return 0;
 739 }
 740
 741 /// Target mremap() handler.
 742 template <class OS>
 743 SyscallReturn
 744 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
 745 {
 746     int index = 0;
 747     Addr start = process->getSyscallArg(tc, index);
 748     uint64_t old_length = process->getSyscallArg(tc, index);
 749     uint64_t new_length = process->getSyscallArg(tc, index);
 750     uint64_t flags = process->getSyscallArg(tc, index);
 751
 752     if ((start % TheISA::VMPageSize != 0) ||
 753             (new_length % TheISA::VMPageSize != 0)) {
 754         warn("mremap failing: arguments not page aligned");
 755         return -EINVAL;
 756     }
 757
 758     if (new_length > old_length) {
 759         if ((start + old_length) == process->mmap_end) {
 760             uint64_t diff = new_length - old_length;
 761             process->allocateMem(process->mmap_end, diff);
 762             process->mmap_end += diff;
 763             return start;
 764         } else {
 765             // sys/mman.h defined MREMAP_MAYMOVE
 766             if (!(flags & 1)) {
 767                 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
 768                 return -ENOMEM;
 769             } else {
 770                 process->pTable->remap(start, old_length, process->mmap_end);
 771                 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
 772                         process->mmap_end, process->mmap_end + new_length, new_length);
 773                 start = process->mmap_end;
 774                 // add on the remaining unallocated pages
 775                 process->allocateMem(start + old_length,
 776                                      new_length - old_length);
 777                 process->mmap_end += new_length;
 778                 warn("returning %08p as start\n", start);
 779                 return start;
 780             }
 781         }
 782     } else {
 783         process->pTable->unmap(start + new_length, old_length - new_length);
 784         return start;
 785     }
 786 }
 787
 788 /// Target stat() handler.
 789 template <class OS>
 790 SyscallReturn
 791 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 792          ThreadContext *tc)
 793 {
 794     std::string path;
 795
 796     int index = 0;
 797     if (!tc->getMemProxy().tryReadString(path,
 798                 process->getSyscallArg(tc, index))) {
 799         return -EFAULT;
 800     }
 801     Addr bufPtr = process->getSyscallArg(tc, index);
 802
 803     // Adjust path for current working directory
 804     path = process->fullPath(path);
 805
 806     struct stat hostBuf;
 807     int result = stat(path.c_str(), &hostBuf);
 808
 809     if (result < 0)
 810         return -errno;
 811
 812     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 813
 814     return 0;
 815 }
 816
 817
 818 /// Target stat64() handler.
 819 template <class OS>
 820 SyscallReturn
 821 stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 822            ThreadContext *tc)
 823 {
 824     std::string path;
 825
 826     int index = 0;
 827     if (!tc->getMemProxy().tryReadString(path,
 828                 process->getSyscallArg(tc, index)))
 829         return -EFAULT;
 830     Addr bufPtr = process->getSyscallArg(tc, index);
 831
 832     // Adjust path for current working directory
 833     path = process->fullPath(path);
 834
 835 #if NO_STAT64
 836     struct stat  hostBuf;
 837     int result = stat(path.c_str(), &hostBuf);
 838 #else
 839     struct stat64 hostBuf;
 840     int result = stat64(path.c_str(), &hostBuf);
 841 #endif
 842
 843     if (result < 0)
 844         return -errno;
 845
 846     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 847
 848     return 0;
 849 }
 850
 851
 852 /// Target fstat64() handler.
 853 template <class OS>
 854 SyscallReturn
 855 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 856             ThreadContext *tc)
 857 {
 858     int index = 0;
 859     int fd = process->getSyscallArg(tc, index);
 860     Addr bufPtr = process->getSyscallArg(tc, index);
 861     if (fd < 0 || process->sim_fd(fd) < 0) {
 862         // doesn't map to any simulator fd: not a valid target fd
 863         return -EBADF;
 864     }
 865
 866 #if NO_STAT64
 867     struct stat  hostBuf;
 868     int result = fstat(process->sim_fd(fd), &hostBuf);
 869 #else
 870     struct stat64  hostBuf;
 871     int result = fstat64(process->sim_fd(fd), &hostBuf);
 872 #endif
 873
 874     if (result < 0)
 875         return -errno;
 876
 877     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
 878
 879     return 0;
 880 }
 881
 882
 883 /// Target lstat() handler.
 884 template <class OS>
 885 SyscallReturn
 886 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 887           ThreadContext *tc)
 888 {
 889     std::string path;
 890
 891     int index = 0;
 892     if (!tc->getMemProxy().tryReadString(path,
 893                 process->getSyscallArg(tc, index))) {
 894         return -EFAULT;
 895     }
 896     Addr bufPtr = process->getSyscallArg(tc, index);
 897
 898     // Adjust path for current working directory
 899     path = process->fullPath(path);
 900
 901     struct stat hostBuf;
 902     int result = lstat(path.c_str(), &hostBuf);
 903
 904     if (result < 0)
 905         return -errno;
 906
 907     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 908
 909     return 0;
 910 }
 911
 912 /// Target lstat64() handler.
 913 template <class OS>
 914 SyscallReturn
 915 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 916             ThreadContext *tc)
 917 {
 918     std::string path;
 919
 920     int index = 0;
 921     if (!tc->getMemProxy().tryReadString(path,
 922                 process->getSyscallArg(tc, index))) {
 923         return -EFAULT;
 924     }
 925     Addr bufPtr = process->getSyscallArg(tc, index);
 926
 927     // Adjust path for current working directory
 928     path = process->fullPath(path);
 929
 930 #if NO_STAT64
 931     struct stat hostBuf;
 932     int result = lstat(path.c_str(), &hostBuf);
 933 #else
 934     struct stat64 hostBuf;
 935     int result = lstat64(path.c_str(), &hostBuf);
 936 #endif
 937
 938     if (result < 0)
 939         return -errno;
 940
 941     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 942
 943     return 0;
 944 }
 945
 946 /// Target fstat() handler.
 947 template <class OS>
 948 SyscallReturn
 949 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 950           ThreadContext *tc)
 951 {
 952     int index = 0;
 953     int fd = process->sim_fd(process->getSyscallArg(tc, index));
 954     Addr bufPtr = process->getSyscallArg(tc, index);
 955
 956     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
 957
 958     if (fd < 0)
 959         return -EBADF;
 960
 961     struct stat hostBuf;
 962     int result = fstat(fd, &hostBuf);
 963
 964     if (result < 0)
 965         return -errno;
 966
 967     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
 968
 969     return 0;
 970 }
 971
 972
 973 /// Target statfs() handler.
 974 template <class OS>
 975 SyscallReturn
 976 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 977            ThreadContext *tc)
 978 {
 979     std::string path;
 980
 981     int index = 0;
 982     if (!tc->getMemProxy().tryReadString(path,
 983                 process->getSyscallArg(tc, index))) {
 984         return -EFAULT;
 985     }
 986     Addr bufPtr = process->getSyscallArg(tc, index);
 987
 988     // Adjust path for current working directory
 989     path = process->fullPath(path);
 990
 991     struct statfs hostBuf;
 992     int result = statfs(path.c_str(), &hostBuf);
 993
 994     if (result < 0)
 995         return -errno;
 996
 997     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
 998
 999     return 0;
1000 }
1001
1002
1003 /// Target fstatfs() handler.
1004 template <class OS>
1005 SyscallReturn
1006 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1007             ThreadContext *tc)
1008 {
1009     int index = 0;
1010     int fd = process->sim_fd(process->getSyscallArg(tc, index));
1011     Addr bufPtr = process->getSyscallArg(tc, index);
1012
1013     if (fd < 0)
1014         return -EBADF;
1015
1016     struct statfs hostBuf;
1017     int result = fstatfs(fd, &hostBuf);
1018
1019     if (result < 0)
1020         return -errno;
1021
1022     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1023
1024     return 0;
1025 }
1026
1027
1028 /// Target writev() handler.
1029 template <class OS>
1030 SyscallReturn
1031 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1032            ThreadContext *tc)
1033 {
1034     int index = 0;
1035     int fd = process->getSyscallArg(tc, index);
1036     if (fd < 0 || process->sim_fd(fd) < 0) {
1037         // doesn't map to any simulator fd: not a valid target fd
1038         return -EBADF;
1039     }
1040
1041     SETranslatingPortProxy &p = tc->getMemProxy();
1042     uint64_t tiov_base = process->getSyscallArg(tc, index);
1043     size_t count = process->getSyscallArg(tc, index);
1044     struct iovec hiov[count];
1045     for (size_t i = 0; i < count; ++i) {
1046         typename OS::tgt_iovec tiov;
1047
1048         p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1049                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1050         hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1051         hiov[i].iov_base = new char [hiov[i].iov_len];
1052         p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1053                    hiov[i].iov_len);
1054     }
1055
1056     int result = writev(process->sim_fd(fd), hiov, count);
1057
1058     for (size_t i = 0; i < count; ++i)
1059         delete [] (char *)hiov[i].iov_base;
1060
1061     if (result < 0)
1062         return -errno;
1063
1064     return 0;
1065 }
1066
1067
1068 /// Target mmap() handler.
1069 ///
1070 /// We don't really handle mmap().  If the target is mmaping an
1071 /// anonymous region or /dev/zero, we can get away with doing basically
1072 /// nothing (since memory is initialized to zero and the simulator
1073 /// doesn't really check addresses anyway).
1074 ///
1075 template <class OS>
1076 SyscallReturn
1077 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1078 {
1079     int index = 0;
1080     Addr start = p->getSyscallArg(tc, index);
1081     uint64_t length = p->getSyscallArg(tc, index);
1082     index++; // int prot = p->getSyscallArg(tc, index);
1083     int flags = p->getSyscallArg(tc, index);
1084     int tgt_fd = p->getSyscallArg(tc, index);
1085     // int offset = p->getSyscallArg(tc, index);
1086
1087     if (length > 0x100000000ULL)
1088         warn("mmap length argument %#x is unreasonably large.\n", length);
1089
1090     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1091         Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1092         if (!fd_map || fd_map->fd < 0) {
1093             warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1094             return -EBADF;
1095         }
1096
1097         if (fd_map->filename != "/dev/zero") {
1098             // This is very likely broken, but leave a warning here
1099             // (rather than panic) in case /dev/zero is known by
1100             // another name on some platform
1101             warn("allowing mmap of file %s; mmap not supported on files"
1102                  " other than /dev/zero\n", fd_map->filename);
1103         }
1104     }
1105
1106     if ((start  % TheISA::VMPageSize) != 0 ||
1107         (length % TheISA::VMPageSize) != 0) {
1108         warn("mmap failing: arguments not page-aligned: "
1109              "start 0x%x length 0x%x",
1110              start, length);
1111         return -EINVAL;
1112     }
1113
1114     // are we ok with clobbering existing mappings?  only set this to
1115     // true if the user has been warned.
1116     bool clobber = false;
1117
1118     // try to use the caller-provided address if there is one
1119     bool use_provided_address = (start != 0);
1120
1121     if (use_provided_address) {
1122         // check to see if the desired address is already in use
1123         if (!p->pTable->isUnmapped(start, length)) {
1124             // there are existing mappings in the desired range
1125             // whether we clobber them or not depends on whether the caller
1126             // specified MAP_FIXED
1127             if (flags & OS::TGT_MAP_FIXED) {
1128                 // MAP_FIXED specified: clobber existing mappings
1129                 warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
1130                      start);
1131                 clobber = true;
1132             } else {
1133                 // MAP_FIXED not specified: ignore suggested start address
1134                 warn("mmap: ignoring suggested map address 0x%x\n", start);
1135                 use_provided_address = false;
1136             }
1137         }
1138     }
1139
1140     if (!use_provided_address) {
1141         // no address provided, or provided address unusable:
1142         // pick next address from our "mmap region"
1143         if (OS::mmapGrowsDown()) {
1144             start = p->mmap_end - length;
1145             p->mmap_end = start;
1146         } else {
1147             start = p->mmap_end;
1148             p->mmap_end += length;
1149         }
1150     }
1151
1152     p->allocateMem(start, length, clobber);
1153
1154     return start;
1155 }
1156
1157 /// Target getrlimit() handler.
1158 template <class OS>
1159 SyscallReturn
1160 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1161         ThreadContext *tc)
1162 {
1163     int index = 0;
1164     unsigned resource = process->getSyscallArg(tc, index);
1165     TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1166
1167     switch (resource) {
1168         case OS::TGT_RLIMIT_STACK:
1169             // max stack size in bytes: make up a number (8MB for now)
1170             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1171             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1172             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1173             break;
1174
1175         case OS::TGT_RLIMIT_DATA:
1176             // max data segment size in bytes: make up a number
1177             rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1178             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1179             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1180             break;
1181
1182         default:
1183             std::cerr << "getrlimitFunc: unimplemented resource " << resource
1184                 << std::endl;
1185             abort();
1186             break;
1187     }
1188
1189     rlp.copyOut(tc->getMemProxy());
1190     return 0;
1191 }
1192
1193 /// Target gettimeofday() handler.
1194 template <class OS>
1195 SyscallReturn
1196 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1197         ThreadContext *tc)
1198 {
1199     int index = 0;
1200     TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1201
1202     getElapsedTime(tp->tv_sec, tp->tv_usec);
1203     tp->tv_sec += seconds_since_epoch;
1204     tp->tv_sec = TheISA::htog(tp->tv_sec);
1205     tp->tv_usec = TheISA::htog(tp->tv_usec);
1206
1207     tp.copyOut(tc->getMemProxy());
1208
1209     return 0;
1210 }
1211
1212
1213 /// Target utimes() handler.
1214 template <class OS>
1215 SyscallReturn
1216 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1217            ThreadContext *tc)
1218 {
1219     std::string path;
1220
1221     int index = 0;
1222     if (!tc->getMemProxy().tryReadString(path,
1223                 process->getSyscallArg(tc, index))) {
1224         return -EFAULT;
1225     }
1226
1227     TypedBufferArg<typename OS::timeval [2]>
1228         tp(process->getSyscallArg(tc, index));
1229     tp.copyIn(tc->getMemProxy());
1230
1231     struct timeval hostTimeval[2];
1232     for (int i = 0; i < 2; ++i)
1233     {
1234         hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1235         hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1236     }
1237
1238     // Adjust path for current working directory
1239     path = process->fullPath(path);
1240
1241     int result = utimes(path.c_str(), hostTimeval);
1242
1243     if (result < 0)
1244         return -errno;
1245
1246     return 0;
1247 }
1248 /// Target getrusage() function.
1249 template <class OS>
1250 SyscallReturn
1251 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1252               ThreadContext *tc)
1253 {
1254     int index = 0;
1255     int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1256     TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1257
1258     rup->ru_utime.tv_sec = 0;
1259     rup->ru_utime.tv_usec = 0;
1260     rup->ru_stime.tv_sec = 0;
1261     rup->ru_stime.tv_usec = 0;
1262     rup->ru_maxrss = 0;
1263     rup->ru_ixrss = 0;
1264     rup->ru_idrss = 0;
1265     rup->ru_isrss = 0;
1266     rup->ru_minflt = 0;
1267     rup->ru_majflt = 0;
1268     rup->ru_nswap = 0;
1269     rup->ru_inblock = 0;
1270     rup->ru_oublock = 0;
1271     rup->ru_msgsnd = 0;
1272     rup->ru_msgrcv = 0;
1273     rup->ru_nsignals = 0;
1274     rup->ru_nvcsw = 0;
1275     rup->ru_nivcsw = 0;
1276
1277     switch (who) {
1278       case OS::TGT_RUSAGE_SELF:
1279         getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1280         rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1281         rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1282         break;
1283
1284       case OS::TGT_RUSAGE_CHILDREN:
1285         // do nothing.  We have no child processes, so they take no time.
1286         break;
1287
1288       default:
1289         // don't really handle THREAD or CHILDREN, but just warn and
1290         // plow ahead
1291         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1292              who);
1293     }
1294
1295     rup.copyOut(tc->getMemProxy());
1296
1297     return 0;
1298 }
1299
1300 /// Target times() function.
1301 template <class OS>
1302 SyscallReturn
1303 timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1304            ThreadContext *tc)
1305 {
1306     int index = 0;
1307     TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1308
1309     // Fill in the time structure (in clocks)
1310     int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1311     bufp->tms_utime = clocks;
1312     bufp->tms_stime = 0;
1313     bufp->tms_cutime = 0;
1314     bufp->tms_cstime = 0;
1315
1316     // Convert to host endianness
1317     bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1318
1319     // Write back
1320     bufp.copyOut(tc->getMemProxy());
1321
1322     // Return clock ticks since system boot
1323     return clocks;
1324 }
1325
1326 /// Target time() function.
1327 template <class OS>
1328 SyscallReturn
1329 timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1330            ThreadContext *tc)
1331 {
1332     typename OS::time_t sec, usec;
1333     getElapsedTime(sec, usec);
1334     sec += seconds_since_epoch;
1335
1336     int index = 0;
1337     Addr taddr = (Addr)process->getSyscallArg(tc, index);
1338     if(taddr != 0) {
1339         typename OS::time_t t = sec;
1340         t = TheISA::htog(t);
1341         SETranslatingPortProxy &p = tc->getMemProxy();
1342         p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1343     }
1344     return sec;
1345 }
1346
1347
1348 #endif // __SIM_SYSCALL_EMUL_HH__