src/sim/syscall_emul.hh

   1 /*
   2  * Copyright (c) 2012-2013 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2003-2005 The Regents of The University of Michigan
  15  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Authors: Steve Reinhardt
  41  *          Kevin Lim
  42  */
  43
  44 #ifndef __SIM_SYSCALL_EMUL_HH__
  45 #define __SIM_SYSCALL_EMUL_HH__
  46
  47 #define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
  48   defined(__FreeBSD__) || defined(__CYGWIN__) || \
  49   defined(__NetBSD__))
  50
  51 ///
  52 /// @file syscall_emul.hh
  53 ///
  54 /// This file defines objects used to emulate syscalls from the target
  55 /// application on the host machine.
  56
  57 #ifdef __CYGWIN32__
  58 #include <sys/fcntl.h>  // for O_BINARY
  59 #endif
  60 #include <sys/stat.h>
  61 #include <sys/time.h>
  62 #include <sys/uio.h>
  63 #include <fcntl.h>
  64
  65 #include <cerrno>
  66 #include <string>
  67
  68 #include "base/chunk_generator.hh"
  69 #include "base/intmath.hh"      // for RoundUp
  70 #include "base/misc.hh"
  71 #include "base/trace.hh"
  72 #include "base/types.hh"
  73 #include "config/the_isa.hh"
  74 #include "cpu/base.hh"
  75 #include "cpu/thread_context.hh"
  76 #include "debug/SyscallVerbose.hh"
  77 #include "mem/page_table.hh"
  78 #include "mem/se_translating_port_proxy.hh"
  79 #include "sim/byteswap.hh"
  80 #include "sim/process.hh"
  81 #include "sim/syscallreturn.hh"
  82 #include "sim/system.hh"
  83
  84 ///
  85 /// System call descriptor.
  86 ///
  87 class SyscallDesc {
  88
  89   public:
  90
  91     /// Typedef for target syscall handler functions.
  92     typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
  93                            LiveProcess *, ThreadContext *);
  94
  95     const char *name;   //!< Syscall name (e.g., "open").
  96     FuncPtr funcPtr;    //!< Pointer to emulation function.
  97     int flags;          //!< Flags (see Flags enum).
  98
  99     /// Flag values for controlling syscall behavior.
 100     enum Flags {
 101         /// Don't set return regs according to funcPtr return value.
 102         /// Used for syscalls with non-standard return conventions
 103         /// that explicitly set the ThreadContext regs (e.g.,
 104         /// sigreturn).
 105         SuppressReturnValue = 1
 106     };
 107
 108     /// Constructor.
 109     SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
 110         : name(_name), funcPtr(_funcPtr), flags(_flags)
 111     {
 112     }
 113
 114     /// Emulate the syscall.  Public interface for calling through funcPtr.
 115     void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
 116 };
 117
 118
 119 class BaseBufferArg {
 120
 121   public:
 122
 123     BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
 124     {
 125         bufPtr = new uint8_t[size];
 126         // clear out buffer: in case we only partially populate this,
 127         // and then do a copyOut(), we want to make sure we don't
 128         // introduce any random junk into the simulated address space
 129         memset(bufPtr, 0, size);
 130     }
 131
 132     virtual ~BaseBufferArg() { delete [] bufPtr; }
 133
 134     //
 135     // copy data into simulator space (read from target memory)
 136     //
 137     virtual bool copyIn(SETranslatingPortProxy &memproxy)
 138     {
 139         memproxy.readBlob(addr, bufPtr, size);
 140         return true;    // no EFAULT detection for now
 141     }
 142
 143     //
 144     // copy data out of simulator space (write to target memory)
 145     //
 146     virtual bool copyOut(SETranslatingPortProxy &memproxy)
 147     {
 148         memproxy.writeBlob(addr, bufPtr, size);
 149         return true;    // no EFAULT detection for now
 150     }
 151
 152   protected:
 153     Addr addr;
 154     int size;
 155     uint8_t *bufPtr;
 156 };
 157
 158
 159 class BufferArg : public BaseBufferArg
 160 {
 161   public:
 162     BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
 163     void *bufferPtr()   { return bufPtr; }
 164 };
 165
 166 template <class T>
 167 class TypedBufferArg : public BaseBufferArg
 168 {
 169   public:
 170     // user can optionally specify a specific number of bytes to
 171     // allocate to deal with those structs that have variable-size
 172     // arrays at the end
 173     TypedBufferArg(Addr _addr, int _size = sizeof(T))
 174         : BaseBufferArg(_addr, _size)
 175     { }
 176
 177     // type case
 178     operator T*() { return (T *)bufPtr; }
 179
 180     // dereference operators
 181     T &operator*()       { return *((T *)bufPtr); }
 182     T* operator->()      { return (T *)bufPtr; }
 183     T &operator[](int i) { return ((T *)bufPtr)[i]; }
 184 };
 185
 186 //////////////////////////////////////////////////////////////////////
 187 //
 188 // The following emulation functions are generic enough that they
 189 // don't need to be recompiled for different emulated OS's.  They are
 190 // defined in sim/syscall_emul.cc.
 191 //
 192 //////////////////////////////////////////////////////////////////////
 193
 194
 195 /// Handler for unimplemented syscalls that we haven't thought about.
 196 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 197                                 LiveProcess *p, ThreadContext *tc);
 198
 199 /// Handler for unimplemented syscalls that we never intend to
 200 /// implement (signal handling, etc.) and should not affect the correct
 201 /// behavior of the program.  Print a warning only if the appropriate
 202 /// trace flag is enabled.  Return success to the target program.
 203 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 204                          LiveProcess *p, ThreadContext *tc);
 205 SyscallReturn ignoreWarnOnceFunc(SyscallDesc *desc, int num,
 206                          LiveProcess *p, ThreadContext *tc);
 207
 208 /// Target exit() handler: terminate current context.
 209 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 210                        LiveProcess *p, ThreadContext *tc);
 211
 212 /// Target exit_group() handler: terminate simulation. (exit all threads)
 213 SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
 214                        LiveProcess *p, ThreadContext *tc);
 215
 216 /// Target getpagesize() handler.
 217 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 218                               LiveProcess *p, ThreadContext *tc);
 219
 220 /// Target brk() handler: set brk address.
 221 SyscallReturn brkFunc(SyscallDesc *desc, int num,
 222                       LiveProcess *p, ThreadContext *tc);
 223
 224 /// Target close() handler.
 225 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 226                         LiveProcess *p, ThreadContext *tc);
 227
 228 /// Target read() handler.
 229 SyscallReturn readFunc(SyscallDesc *desc, int num,
 230                        LiveProcess *p, ThreadContext *tc);
 231
 232 /// Target write() handler.
 233 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 234                         LiveProcess *p, ThreadContext *tc);
 235
 236 /// Target lseek() handler.
 237 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 238                         LiveProcess *p, ThreadContext *tc);
 239
 240 /// Target _llseek() handler.
 241 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
 242                         LiveProcess *p, ThreadContext *tc);
 243
 244 /// Target munmap() handler.
 245 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 246                          LiveProcess *p, ThreadContext *tc);
 247
 248 /// Target gethostname() handler.
 249 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 250                               LiveProcess *p, ThreadContext *tc);
 251
 252 /// Target getcwd() handler.
 253 SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
 254                          LiveProcess *p, ThreadContext *tc);
 255
 256 /// Target readlink() handler.
 257 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 258                            LiveProcess *p, ThreadContext *tc,
 259                            int index = 0);
 260 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 261                            LiveProcess *p, ThreadContext *tc);
 262
 263 /// Target unlink() handler.
 264 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 265                          LiveProcess *p, ThreadContext *tc);
 266
 267 /// Target mkdir() handler.
 268 SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
 269                         LiveProcess *p, ThreadContext *tc);
 270
 271 /// Target rename() handler.
 272 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 273                          LiveProcess *p, ThreadContext *tc);
 274
 275
 276 /// Target truncate() handler.
 277 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 278                            LiveProcess *p, ThreadContext *tc);
 279
 280
 281 /// Target ftruncate() handler.
 282 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 283                             LiveProcess *p, ThreadContext *tc);
 284
 285
 286 /// Target truncate64() handler.
 287 SyscallReturn truncate64Func(SyscallDesc *desc, int num,
 288                              LiveProcess *p, ThreadContext *tc);
 289
 290 /// Target ftruncate64() handler.
 291 SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
 292                               LiveProcess *p, ThreadContext *tc);
 293
 294
 295 /// Target umask() handler.
 296 SyscallReturn umaskFunc(SyscallDesc *desc, int num,
 297                         LiveProcess *p, ThreadContext *tc);
 298
 299
 300 /// Target chown() handler.
 301 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 302                         LiveProcess *p, ThreadContext *tc);
 303
 304
 305 /// Target fchown() handler.
 306 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 307                          LiveProcess *p, ThreadContext *tc);
 308
 309 /// Target dup() handler.
 310 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 311                       LiveProcess *process, ThreadContext *tc);
 312
 313 /// Target fnctl() handler.
 314 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 315                         LiveProcess *process, ThreadContext *tc);
 316
 317 /// Target fcntl64() handler.
 318 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 319                         LiveProcess *process, ThreadContext *tc);
 320
 321 /// Target setuid() handler.
 322 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 323                                LiveProcess *p, ThreadContext *tc);
 324
 325 /// Target getpid() handler.
 326 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 327                                LiveProcess *p, ThreadContext *tc);
 328
 329 /// Target getuid() handler.
 330 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 331                                LiveProcess *p, ThreadContext *tc);
 332
 333 /// Target getgid() handler.
 334 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 335                                LiveProcess *p, ThreadContext *tc);
 336
 337 /// Target getppid() handler.
 338 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 339                                LiveProcess *p, ThreadContext *tc);
 340
 341 /// Target geteuid() handler.
 342 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 343                                LiveProcess *p, ThreadContext *tc);
 344
 345 /// Target getegid() handler.
 346 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 347                                LiveProcess *p, ThreadContext *tc);
 348
 349 /// Target clone() handler.
 350 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
 351                                LiveProcess *p, ThreadContext *tc);
 352
 353 /// Target access() handler
 354 SyscallReturn accessFunc(SyscallDesc *desc, int num,
 355                                LiveProcess *p, ThreadContext *tc);
 356 SyscallReturn accessFunc(SyscallDesc *desc, int num,
 357                                LiveProcess *p, ThreadContext *tc,
 358                                int index);
 359
 360 /// Futex system call
 361 ///  Implemented by Daniel Sanchez
 362 ///  Used by printf's in multi-threaded apps
 363 template <class OS>
 364 SyscallReturn
 365 futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 366           ThreadContext *tc)
 367 {
 368     int index_uaddr = 0;
 369     int index_op = 1;
 370     int index_val = 2;
 371     int index_timeout = 3;
 372
 373     uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
 374     int op = process->getSyscallArg(tc, index_op);
 375     int val = process->getSyscallArg(tc, index_val);
 376     uint64_t timeout = process->getSyscallArg(tc, index_timeout);
 377
 378     std::map<uint64_t, std::list<ThreadContext *> * >
 379         &futex_map = tc->getSystemPtr()->futexMap;
 380
 381     DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
 382             uaddr, op, val);
 383
 384     op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
 385
 386     if (op == OS::TGT_FUTEX_WAIT) {
 387         if (timeout != 0) {
 388             warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
 389                  "we'll wait indefinitely");
 390         }
 391
 392         uint8_t *buf = new uint8_t[sizeof(int)];
 393         tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
 394         int mem_val = *((int *)buf);
 395         delete buf;
 396
 397         if(val != mem_val) {
 398             DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
 399                                     "expected: %d\n", mem_val, val);
 400             return -OS::TGT_EWOULDBLOCK;
 401         }
 402
 403         // Queue the thread context
 404         std::list<ThreadContext *> * tcWaitList;
 405         if (futex_map.count(uaddr)) {
 406             tcWaitList = futex_map.find(uaddr)->second;
 407         } else {
 408             tcWaitList = new std::list<ThreadContext *>();
 409             futex_map.insert(std::pair< uint64_t,
 410                             std::list<ThreadContext *> * >(uaddr, tcWaitList));
 411         }
 412         tcWaitList->push_back(tc);
 413         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
 414                                 "thread context\n");
 415         tc->suspend();
 416         return 0;
 417     } else if (op == OS::TGT_FUTEX_WAKE){
 418         int wokenUp = 0;
 419         std::list<ThreadContext *> * tcWaitList;
 420         if (futex_map.count(uaddr)) {
 421             tcWaitList = futex_map.find(uaddr)->second;
 422             while (tcWaitList->size() > 0 && wokenUp < val) {
 423                 tcWaitList->front()->activate();
 424                 tcWaitList->pop_front();
 425                 wokenUp++;
 426             }
 427             if(tcWaitList->empty()) {
 428                 futex_map.erase(uaddr);
 429                 delete tcWaitList;
 430             }
 431         }
 432         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
 433                                 "thread contexts\n", wokenUp);
 434         return wokenUp;
 435     } else {
 436         warn("sys_futex: op %d is not implemented, just returning...", op);
 437         return 0;
 438     }
 439
 440 }
 441
 442
 443 /// Pseudo Funcs  - These functions use a different return convension,
 444 /// returning a second value in a register other than the normal return register
 445 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 446                              LiveProcess *process, ThreadContext *tc);
 447
 448 /// Target getpidPseudo() handler.
 449 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 450                                LiveProcess *p, ThreadContext *tc);
 451
 452 /// Target getuidPseudo() handler.
 453 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 454                                LiveProcess *p, ThreadContext *tc);
 455
 456 /// Target getgidPseudo() handler.
 457 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 458                                LiveProcess *p, ThreadContext *tc);
 459
 460
 461 /// A readable name for 1,000,000, for converting microseconds to seconds.
 462 const int one_million = 1000000;
 463
 464 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 465 /// by my reckoning.  We want to keep this a constant (not use the
 466 /// real-world time) to keep simulations repeatable.
 467 const unsigned seconds_since_epoch = 1000000000;
 468
 469 /// Helper function to convert current elapsed time to seconds and
 470 /// microseconds.
 471 template <class T1, class T2>
 472 void
 473 getElapsedTime(T1 &sec, T2 &usec)
 474 {
 475     int elapsed_usecs = curTick() / SimClock::Int::us;
 476     sec = elapsed_usecs / one_million;
 477     usec = elapsed_usecs % one_million;
 478 }
 479
 480 //////////////////////////////////////////////////////////////////////
 481 //
 482 // The following emulation functions are generic, but need to be
 483 // templated to account for differences in types, constants, etc.
 484 //
 485 //////////////////////////////////////////////////////////////////////
 486
 487 #if NO_STAT64
 488     typedef struct stat hst_stat;
 489     typedef struct stat hst_stat64;
 490 #else
 491     typedef struct stat hst_stat;
 492     typedef struct stat64 hst_stat64;
 493 #endif
 494
 495 //// Helper function to convert a host stat buffer to a target stat
 496 //// buffer.  Also copies the target buffer out to the simulated
 497 //// memory space.  Used by stat(), fstat(), and lstat().
 498
 499 template <typename target_stat, typename host_stat>
 500 static void
 501 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 502 {
 503     using namespace TheISA;
 504
 505     if (fakeTTY)
 506         tgt->st_dev = 0xA;
 507     else
 508         tgt->st_dev = host->st_dev;
 509     tgt->st_dev = TheISA::htog(tgt->st_dev);
 510     tgt->st_ino = host->st_ino;
 511     tgt->st_ino = TheISA::htog(tgt->st_ino);
 512     tgt->st_mode = host->st_mode;
 513     if (fakeTTY) {
 514         // Claim to be a character device
 515         tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
 516         tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
 517     }
 518     tgt->st_mode = TheISA::htog(tgt->st_mode);
 519     tgt->st_nlink = host->st_nlink;
 520     tgt->st_nlink = TheISA::htog(tgt->st_nlink);
 521     tgt->st_uid = host->st_uid;
 522     tgt->st_uid = TheISA::htog(tgt->st_uid);
 523     tgt->st_gid = host->st_gid;
 524     tgt->st_gid = TheISA::htog(tgt->st_gid);
 525     if (fakeTTY)
 526         tgt->st_rdev = 0x880d;
 527     else
 528         tgt->st_rdev = host->st_rdev;
 529     tgt->st_rdev = TheISA::htog(tgt->st_rdev);
 530     tgt->st_size = host->st_size;
 531     tgt->st_size = TheISA::htog(tgt->st_size);
 532     tgt->st_atimeX = host->st_atime;
 533     tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
 534     tgt->st_mtimeX = host->st_mtime;
 535     tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
 536     tgt->st_ctimeX = host->st_ctime;
 537     tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
 538     // Force the block size to be 8k. This helps to ensure buffered io works
 539     // consistently across different hosts.
 540     tgt->st_blksize = 0x2000;
 541     tgt->st_blksize = TheISA::htog(tgt->st_blksize);
 542     tgt->st_blocks = host->st_blocks;
 543     tgt->st_blocks = TheISA::htog(tgt->st_blocks);
 544 }
 545
 546 // Same for stat64
 547
 548 template <typename target_stat, typename host_stat64>
 549 static void
 550 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 551 {
 552     using namespace TheISA;
 553
 554     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 555 #if defined(STAT_HAVE_NSEC)
 556     tgt->st_atime_nsec = host->st_atime_nsec;
 557     tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
 558     tgt->st_mtime_nsec = host->st_mtime_nsec;
 559     tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
 560     tgt->st_ctime_nsec = host->st_ctime_nsec;
 561     tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
 562 #else
 563     tgt->st_atime_nsec = 0;
 564     tgt->st_mtime_nsec = 0;
 565     tgt->st_ctime_nsec = 0;
 566 #endif
 567 }
 568
 569 //Here are a couple convenience functions
 570 template<class OS>
 571 static void
 572 copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
 573         hst_stat *host, bool fakeTTY = false)
 574 {
 575     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 576     tgt_stat_buf tgt(addr);
 577     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 578     tgt.copyOut(mem);
 579 }
 580
 581 template<class OS>
 582 static void
 583 copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
 584         hst_stat64 *host, bool fakeTTY = false)
 585 {
 586     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 587     tgt_stat_buf tgt(addr);
 588     convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 589     tgt.copyOut(mem);
 590 }
 591
 592 /// Target ioctl() handler.  For the most part, programs call ioctl()
 593 /// only to find out if their stdout is a tty, to determine whether to
 594 /// do line or block buffering.  We always claim that output fds are
 595 /// not TTYs to provide repeatable results.
 596 template <class OS>
 597 SyscallReturn
 598 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 599           ThreadContext *tc)
 600 {
 601     int index = 0;
 602     int fd = process->getSyscallArg(tc, index);
 603     unsigned req = process->getSyscallArg(tc, index);
 604
 605     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 606
 607     if (fd < 0 || process->sim_fd(fd) < 0) {
 608         // doesn't map to any simulator fd: not a valid target fd
 609         return -EBADF;
 610     }
 611
 612     if (OS::isTtyReq(req)) {
 613         return -ENOTTY;
 614     }
 615
 616     warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
 617          fd, req, tc->pcState());
 618     return -ENOTTY;
 619 }
 620
 621 template <class OS>
 622 static SyscallReturn
 623 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 624          ThreadContext *tc, int index)
 625 {
 626     std::string path;
 627
 628     if (!tc->getMemProxy().tryReadString(path,
 629                 process->getSyscallArg(tc, index)))
 630         return -EFAULT;
 631
 632     if (path == "/dev/sysdev0") {
 633         // This is a memory-mapped high-resolution timer device on Alpha.
 634         // We don't support it, so just punt.
 635         warn("Ignoring open(%s, ...)\n", path);
 636         return -ENOENT;
 637     }
 638
 639     int tgtFlags = process->getSyscallArg(tc, index);
 640     int mode = process->getSyscallArg(tc, index);
 641     int hostFlags = 0;
 642
 643     // translate open flags
 644     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 645         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 646             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 647             hostFlags |= OS::openFlagTable[i].hostFlag;
 648         }
 649     }
 650
 651     // any target flags left?
 652     if (tgtFlags != 0)
 653         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 654
 655 #ifdef __CYGWIN32__
 656     hostFlags |= O_BINARY;
 657 #endif
 658
 659     // Adjust path for current working directory
 660     path = process->fullPath(path);
 661
 662     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 663
 664     int fd;
 665     int local_errno;
 666     if (startswith(path, "/proc/") || startswith(path, "/system/") ||
 667         startswith(path, "/platform/") || startswith(path, "/sys/")) {
 668         // It's a proc/sys entry and requires special handling
 669         fd = OS::openSpecialFile(path, process, tc);
 670         local_errno = ENOENT;
 671      } else {
 672         // open the file
 673         fd = open(path.c_str(), hostFlags, mode);
 674         local_errno = errno;
 675      }
 676
 677     if (fd == -1)
 678         return -local_errno;
 679
 680     return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
 681 }
 682
 683 /// Target open() handler.
 684 template <class OS>
 685 SyscallReturn
 686 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 687          ThreadContext *tc)
 688 {
 689     return openFunc<OS>(desc, callnum, process, tc, 0);
 690 }
 691
 692 /// Target openat() handler.
 693 template <class OS>
 694 SyscallReturn
 695 openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 696          ThreadContext *tc)
 697 {
 698     int index = 0;
 699     int dirfd = process->getSyscallArg(tc, index);
 700     if (dirfd != OS::TGT_AT_FDCWD)
 701         warn("openat: first argument not AT_FDCWD; unlikely to work");
 702     return openFunc<OS>(desc, callnum, process, tc, 1);
 703 }
 704
 705 /// Target facessat() handler
 706 template <class OS>
 707 SyscallReturn
 708 faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 709         ThreadContext *tc)
 710 {
 711     int index = 0;
 712     int dirfd = process->getSyscallArg(tc, index);
 713     if (dirfd != OS::TGT_AT_FDCWD)
 714         warn("faccessat: first argument not AT_FDCWD; unlikely to work");
 715     return accessFunc(desc, callnum, process, tc, 1);
 716 }
 717
 718 /// Target readlinkat() handler
 719 template <class OS>
 720 SyscallReturn
 721 readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 722         ThreadContext *tc)
 723 {
 724     int index = 0;
 725     int dirfd = process->getSyscallArg(tc, index);
 726     if (dirfd != OS::TGT_AT_FDCWD)
 727         warn("openat: first argument not AT_FDCWD; unlikely to work");
 728     return readlinkFunc(desc, callnum, process, tc, 1);
 729 }
 730
 731 /// Target sysinfo() handler.
 732 template <class OS>
 733 SyscallReturn
 734 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 735          ThreadContext *tc)
 736 {
 737
 738     int index = 0;
 739     TypedBufferArg<typename OS::tgt_sysinfo>
 740         sysinfo(process->getSyscallArg(tc, index));
 741
 742     sysinfo->uptime=seconds_since_epoch;
 743     sysinfo->totalram=process->system->memSize();
 744
 745     sysinfo.copyOut(tc->getMemProxy());
 746
 747     return 0;
 748 }
 749
 750 /// Target chmod() handler.
 751 template <class OS>
 752 SyscallReturn
 753 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 754           ThreadContext *tc)
 755 {
 756     std::string path;
 757
 758     int index = 0;
 759     if (!tc->getMemProxy().tryReadString(path,
 760                 process->getSyscallArg(tc, index))) {
 761         return -EFAULT;
 762     }
 763
 764     uint32_t mode = process->getSyscallArg(tc, index);
 765     mode_t hostMode = 0;
 766
 767     // XXX translate mode flags via OS::something???
 768     hostMode = mode;
 769
 770     // Adjust path for current working directory
 771     path = process->fullPath(path);
 772
 773     // do the chmod
 774     int result = chmod(path.c_str(), hostMode);
 775     if (result < 0)
 776         return -errno;
 777
 778     return 0;
 779 }
 780
 781
 782 /// Target fchmod() handler.
 783 template <class OS>
 784 SyscallReturn
 785 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 786            ThreadContext *tc)
 787 {
 788     int index = 0;
 789     int fd = process->getSyscallArg(tc, index);
 790     if (fd < 0 || process->sim_fd(fd) < 0) {
 791         // doesn't map to any simulator fd: not a valid target fd
 792         return -EBADF;
 793     }
 794
 795     uint32_t mode = process->getSyscallArg(tc, index);
 796     mode_t hostMode = 0;
 797
 798     // XXX translate mode flags via OS::someting???
 799     hostMode = mode;
 800
 801     // do the fchmod
 802     int result = fchmod(process->sim_fd(fd), hostMode);
 803     if (result < 0)
 804         return -errno;
 805
 806     return 0;
 807 }
 808
 809 /// Target mremap() handler.
 810 template <class OS>
 811 SyscallReturn
 812 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
 813 {
 814     int index = 0;
 815     Addr start = process->getSyscallArg(tc, index);
 816     uint64_t old_length = process->getSyscallArg(tc, index);
 817     uint64_t new_length = process->getSyscallArg(tc, index);
 818     uint64_t flags = process->getSyscallArg(tc, index);
 819     uint64_t provided_address = 0;
 820     bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
 821
 822     if (use_provided_address)
 823         provided_address = process->getSyscallArg(tc, index);
 824
 825     if ((start % TheISA::PageBytes != 0) ||
 826         (provided_address % TheISA::PageBytes != 0)) {
 827         warn("mremap failing: arguments not page aligned");
 828         return -EINVAL;
 829     }
 830
 831     new_length = roundUp(new_length, TheISA::PageBytes);
 832
 833     if (new_length > old_length) {
 834         if ((start + old_length) == process->mmap_end &&
 835             (!use_provided_address || provided_address == start)) {
 836             uint64_t diff = new_length - old_length;
 837             process->allocateMem(process->mmap_end, diff);
 838             process->mmap_end += diff;
 839             return start;
 840         } else {
 841             if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
 842                 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
 843                 return -ENOMEM;
 844             } else {
 845                 uint64_t new_start = use_provided_address ?
 846                     provided_address : process->mmap_end;
 847                 process->pTable->remap(start, old_length, new_start);
 848                 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
 849                      new_start, new_start + new_length,
 850                      new_length - old_length);
 851                 // add on the remaining unallocated pages
 852                 process->allocateMem(new_start + old_length,
 853                                      new_length - old_length,
 854                                      use_provided_address /* clobber */);
 855                 if (!use_provided_address)
 856                     process->mmap_end += new_length;
 857                 if (use_provided_address &&
 858                     new_start + new_length > process->mmap_end) {
 859                     // something fishy going on here, at least notify the user
 860                     // @todo: increase mmap_end?
 861                     warn("mmap region limit exceeded with MREMAP_FIXED\n");
 862                 }
 863                 warn("returning %08p as start\n", new_start);
 864                 return new_start;
 865             }
 866         }
 867     } else {
 868         if (use_provided_address && provided_address != start)
 869             process->pTable->remap(start, new_length, provided_address);
 870         process->pTable->unmap(start + new_length, old_length - new_length);
 871         return use_provided_address ? provided_address : start;
 872     }
 873 }
 874
 875 /// Target stat() handler.
 876 template <class OS>
 877 SyscallReturn
 878 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 879          ThreadContext *tc)
 880 {
 881     std::string path;
 882
 883     int index = 0;
 884     if (!tc->getMemProxy().tryReadString(path,
 885                 process->getSyscallArg(tc, index))) {
 886         return -EFAULT;
 887     }
 888     Addr bufPtr = process->getSyscallArg(tc, index);
 889
 890     // Adjust path for current working directory
 891     path = process->fullPath(path);
 892
 893     struct stat hostBuf;
 894     int result = stat(path.c_str(), &hostBuf);
 895
 896     if (result < 0)
 897         return -errno;
 898
 899     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 900
 901     return 0;
 902 }
 903
 904
 905 /// Target stat64() handler.
 906 template <class OS>
 907 SyscallReturn
 908 stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 909            ThreadContext *tc)
 910 {
 911     std::string path;
 912
 913     int index = 0;
 914     if (!tc->getMemProxy().tryReadString(path,
 915                 process->getSyscallArg(tc, index)))
 916         return -EFAULT;
 917     Addr bufPtr = process->getSyscallArg(tc, index);
 918
 919     // Adjust path for current working directory
 920     path = process->fullPath(path);
 921
 922 #if NO_STAT64
 923     struct stat  hostBuf;
 924     int result = stat(path.c_str(), &hostBuf);
 925 #else
 926     struct stat64 hostBuf;
 927     int result = stat64(path.c_str(), &hostBuf);
 928 #endif
 929
 930     if (result < 0)
 931         return -errno;
 932
 933     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 934
 935     return 0;
 936 }
 937
 938
 939 /// Target fstatat64() handler.
 940 template <class OS>
 941 SyscallReturn
 942 fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 943               ThreadContext *tc)
 944 {
 945     int index = 0;
 946     int dirfd = process->getSyscallArg(tc, index);
 947     if (dirfd != OS::TGT_AT_FDCWD)
 948         warn("openat: first argument not AT_FDCWD; unlikely to work");
 949
 950     std::string path;
 951     if (!tc->getMemProxy().tryReadString(path,
 952                 process->getSyscallArg(tc, index)))
 953         return -EFAULT;
 954     Addr bufPtr = process->getSyscallArg(tc, index);
 955
 956     // Adjust path for current working directory
 957     path = process->fullPath(path);
 958
 959 #if NO_STAT64
 960     struct stat  hostBuf;
 961     int result = stat(path.c_str(), &hostBuf);
 962 #else
 963     struct stat64 hostBuf;
 964     int result = stat64(path.c_str(), &hostBuf);
 965 #endif
 966
 967     if (result < 0)
 968         return -errno;
 969
 970     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 971
 972     return 0;
 973 }
 974
 975
 976 /// Target fstat64() handler.
 977 template <class OS>
 978 SyscallReturn
 979 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 980             ThreadContext *tc)
 981 {
 982     int index = 0;
 983     int fd = process->getSyscallArg(tc, index);
 984     Addr bufPtr = process->getSyscallArg(tc, index);
 985     if (fd < 0 || process->sim_fd(fd) < 0) {
 986         // doesn't map to any simulator fd: not a valid target fd
 987         return -EBADF;
 988     }
 989
 990 #if NO_STAT64
 991     struct stat  hostBuf;
 992     int result = fstat(process->sim_fd(fd), &hostBuf);
 993 #else
 994     struct stat64  hostBuf;
 995     int result = fstat64(process->sim_fd(fd), &hostBuf);
 996 #endif
 997
 998     if (result < 0)
 999         return -errno;
1000
1001     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1002
1003     return 0;
1004 }
1005
1006
1007 /// Target lstat() handler.
1008 template <class OS>
1009 SyscallReturn
1010 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1011           ThreadContext *tc)
1012 {
1013     std::string path;
1014
1015     int index = 0;
1016     if (!tc->getMemProxy().tryReadString(path,
1017                 process->getSyscallArg(tc, index))) {
1018         return -EFAULT;
1019     }
1020     Addr bufPtr = process->getSyscallArg(tc, index);
1021
1022     // Adjust path for current working directory
1023     path = process->fullPath(path);
1024
1025     struct stat hostBuf;
1026     int result = lstat(path.c_str(), &hostBuf);
1027
1028     if (result < 0)
1029         return -errno;
1030
1031     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1032
1033     return 0;
1034 }
1035
1036 /// Target lstat64() handler.
1037 template <class OS>
1038 SyscallReturn
1039 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1040             ThreadContext *tc)
1041 {
1042     std::string path;
1043
1044     int index = 0;
1045     if (!tc->getMemProxy().tryReadString(path,
1046                 process->getSyscallArg(tc, index))) {
1047         return -EFAULT;
1048     }
1049     Addr bufPtr = process->getSyscallArg(tc, index);
1050
1051     // Adjust path for current working directory
1052     path = process->fullPath(path);
1053
1054 #if NO_STAT64
1055     struct stat hostBuf;
1056     int result = lstat(path.c_str(), &hostBuf);
1057 #else
1058     struct stat64 hostBuf;
1059     int result = lstat64(path.c_str(), &hostBuf);
1060 #endif
1061
1062     if (result < 0)
1063         return -errno;
1064
1065     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1066
1067     return 0;
1068 }
1069
1070 /// Target fstat() handler.
1071 template <class OS>
1072 SyscallReturn
1073 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1074           ThreadContext *tc)
1075 {
1076     int index = 0;
1077     int fd = process->sim_fd(process->getSyscallArg(tc, index));
1078     Addr bufPtr = process->getSyscallArg(tc, index);
1079
1080     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
1081
1082     if (fd < 0)
1083         return -EBADF;
1084
1085     struct stat hostBuf;
1086     int result = fstat(fd, &hostBuf);
1087
1088     if (result < 0)
1089         return -errno;
1090
1091     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1092
1093     return 0;
1094 }
1095
1096
1097 /// Target statfs() handler.
1098 template <class OS>
1099 SyscallReturn
1100 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1101            ThreadContext *tc)
1102 {
1103     std::string path;
1104
1105     int index = 0;
1106     if (!tc->getMemProxy().tryReadString(path,
1107                 process->getSyscallArg(tc, index))) {
1108         return -EFAULT;
1109     }
1110     Addr bufPtr = process->getSyscallArg(tc, index);
1111
1112     // Adjust path for current working directory
1113     path = process->fullPath(path);
1114
1115     struct statfs hostBuf;
1116     int result = statfs(path.c_str(), &hostBuf);
1117
1118     if (result < 0)
1119         return -errno;
1120
1121     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1122
1123     return 0;
1124 }
1125
1126
1127 /// Target fstatfs() handler.
1128 template <class OS>
1129 SyscallReturn
1130 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1131             ThreadContext *tc)
1132 {
1133     int index = 0;
1134     int fd = process->sim_fd(process->getSyscallArg(tc, index));
1135     Addr bufPtr = process->getSyscallArg(tc, index);
1136
1137     if (fd < 0)
1138         return -EBADF;
1139
1140     struct statfs hostBuf;
1141     int result = fstatfs(fd, &hostBuf);
1142
1143     if (result < 0)
1144         return -errno;
1145
1146     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1147
1148     return 0;
1149 }
1150
1151
1152 /// Target writev() handler.
1153 template <class OS>
1154 SyscallReturn
1155 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1156            ThreadContext *tc)
1157 {
1158     int index = 0;
1159     int fd = process->getSyscallArg(tc, index);
1160     if (fd < 0 || process->sim_fd(fd) < 0) {
1161         // doesn't map to any simulator fd: not a valid target fd
1162         return -EBADF;
1163     }
1164
1165     SETranslatingPortProxy &p = tc->getMemProxy();
1166     uint64_t tiov_base = process->getSyscallArg(tc, index);
1167     size_t count = process->getSyscallArg(tc, index);
1168     struct iovec hiov[count];
1169     for (size_t i = 0; i < count; ++i) {
1170         typename OS::tgt_iovec tiov;
1171
1172         p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1173                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1174         hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1175         hiov[i].iov_base = new char [hiov[i].iov_len];
1176         p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1177                    hiov[i].iov_len);
1178     }
1179
1180     int result = writev(process->sim_fd(fd), hiov, count);
1181
1182     for (size_t i = 0; i < count; ++i)
1183         delete [] (char *)hiov[i].iov_base;
1184
1185     if (result < 0)
1186         return -errno;
1187
1188     return 0;
1189 }
1190
1191
1192 /// Target mmap() handler.
1193 ///
1194 /// We don't really handle mmap().  If the target is mmaping an
1195 /// anonymous region or /dev/zero, we can get away with doing basically
1196 /// nothing (since memory is initialized to zero and the simulator
1197 /// doesn't really check addresses anyway).
1198 ///
1199 template <class OS>
1200 SyscallReturn
1201 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1202 {
1203     int index = 0;
1204     Addr start = p->getSyscallArg(tc, index);
1205     uint64_t length = p->getSyscallArg(tc, index);
1206     index++; // int prot = p->getSyscallArg(tc, index);
1207     int flags = p->getSyscallArg(tc, index);
1208     int tgt_fd = p->getSyscallArg(tc, index);
1209     int offset = p->getSyscallArg(tc, index);
1210
1211     if (length > 0x100000000ULL)
1212         warn("mmap length argument %#x is unreasonably large.\n", length);
1213
1214     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1215         Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1216         if (!fd_map || fd_map->fd < 0) {
1217             warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1218             return -EBADF;
1219         }
1220
1221         if (fd_map->filename != "/dev/zero") {
1222             // This is very likely broken, but leave a warning here
1223             // (rather than panic) in case /dev/zero is known by
1224             // another name on some platform
1225             warn("allowing mmap of file %s; mmap not supported on files"
1226                  " other than /dev/zero\n", fd_map->filename);
1227         }
1228     }
1229
1230     length = roundUp(length, TheISA::PageBytes);
1231
1232     if ((start  % TheISA::PageBytes) != 0 ||
1233         (offset % TheISA::PageBytes) != 0) {
1234         warn("mmap failing: arguments not page-aligned: "
1235              "start 0x%x offset 0x%x",
1236              start, offset);
1237         return -EINVAL;
1238     }
1239
1240     // are we ok with clobbering existing mappings?  only set this to
1241     // true if the user has been warned.
1242     bool clobber = false;
1243
1244     // try to use the caller-provided address if there is one
1245     bool use_provided_address = (start != 0);
1246
1247     if (use_provided_address) {
1248         // check to see if the desired address is already in use
1249         if (!p->pTable->isUnmapped(start, length)) {
1250             // there are existing mappings in the desired range
1251             // whether we clobber them or not depends on whether the caller
1252             // specified MAP_FIXED
1253             if (flags & OS::TGT_MAP_FIXED) {
1254                 // MAP_FIXED specified: map attempt fails
1255                 return -EINVAL;
1256             } else {
1257                 // MAP_FIXED not specified: ignore suggested start address
1258                 warn("mmap: ignoring suggested map address 0x%x\n", start);
1259                 use_provided_address = false;
1260             }
1261         }
1262     }
1263
1264     if (!use_provided_address) {
1265         // no address provided, or provided address unusable:
1266         // pick next address from our "mmap region"
1267         if (OS::mmapGrowsDown()) {
1268             start = p->mmap_end - length;
1269             p->mmap_end = start;
1270         } else {
1271             start = p->mmap_end;
1272             p->mmap_end += length;
1273         }
1274     }
1275
1276     p->allocateMem(start, length, clobber);
1277
1278     return start;
1279 }
1280
1281 /// Target getrlimit() handler.
1282 template <class OS>
1283 SyscallReturn
1284 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1285         ThreadContext *tc)
1286 {
1287     int index = 0;
1288     unsigned resource = process->getSyscallArg(tc, index);
1289     TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1290
1291     switch (resource) {
1292         case OS::TGT_RLIMIT_STACK:
1293             // max stack size in bytes: make up a number (8MB for now)
1294             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1295             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1296             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1297             break;
1298
1299         case OS::TGT_RLIMIT_DATA:
1300             // max data segment size in bytes: make up a number
1301             rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1302             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1303             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1304             break;
1305
1306         default:
1307             std::cerr << "getrlimitFunc: unimplemented resource " << resource
1308                 << std::endl;
1309             abort();
1310             break;
1311     }
1312
1313     rlp.copyOut(tc->getMemProxy());
1314     return 0;
1315 }
1316
1317 /// Target gettimeofday() handler.
1318 template <class OS>
1319 SyscallReturn
1320 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1321         ThreadContext *tc)
1322 {
1323     int index = 0;
1324     TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1325
1326     getElapsedTime(tp->tv_sec, tp->tv_usec);
1327     tp->tv_sec += seconds_since_epoch;
1328     tp->tv_sec = TheISA::htog(tp->tv_sec);
1329     tp->tv_usec = TheISA::htog(tp->tv_usec);
1330
1331     tp.copyOut(tc->getMemProxy());
1332
1333     return 0;
1334 }
1335
1336
1337 /// Target utimes() handler.
1338 template <class OS>
1339 SyscallReturn
1340 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1341            ThreadContext *tc)
1342 {
1343     std::string path;
1344
1345     int index = 0;
1346     if (!tc->getMemProxy().tryReadString(path,
1347                 process->getSyscallArg(tc, index))) {
1348         return -EFAULT;
1349     }
1350
1351     TypedBufferArg<typename OS::timeval [2]>
1352         tp(process->getSyscallArg(tc, index));
1353     tp.copyIn(tc->getMemProxy());
1354
1355     struct timeval hostTimeval[2];
1356     for (int i = 0; i < 2; ++i)
1357     {
1358         hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1359         hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1360     }
1361
1362     // Adjust path for current working directory
1363     path = process->fullPath(path);
1364
1365     int result = utimes(path.c_str(), hostTimeval);
1366
1367     if (result < 0)
1368         return -errno;
1369
1370     return 0;
1371 }
1372 /// Target getrusage() function.
1373 template <class OS>
1374 SyscallReturn
1375 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1376               ThreadContext *tc)
1377 {
1378     int index = 0;
1379     int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1380     TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1381
1382     rup->ru_utime.tv_sec = 0;
1383     rup->ru_utime.tv_usec = 0;
1384     rup->ru_stime.tv_sec = 0;
1385     rup->ru_stime.tv_usec = 0;
1386     rup->ru_maxrss = 0;
1387     rup->ru_ixrss = 0;
1388     rup->ru_idrss = 0;
1389     rup->ru_isrss = 0;
1390     rup->ru_minflt = 0;
1391     rup->ru_majflt = 0;
1392     rup->ru_nswap = 0;
1393     rup->ru_inblock = 0;
1394     rup->ru_oublock = 0;
1395     rup->ru_msgsnd = 0;
1396     rup->ru_msgrcv = 0;
1397     rup->ru_nsignals = 0;
1398     rup->ru_nvcsw = 0;
1399     rup->ru_nivcsw = 0;
1400
1401     switch (who) {
1402       case OS::TGT_RUSAGE_SELF:
1403         getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1404         rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1405         rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1406         break;
1407
1408       case OS::TGT_RUSAGE_CHILDREN:
1409         // do nothing.  We have no child processes, so they take no time.
1410         break;
1411
1412       default:
1413         // don't really handle THREAD or CHILDREN, but just warn and
1414         // plow ahead
1415         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1416              who);
1417     }
1418
1419     rup.copyOut(tc->getMemProxy());
1420
1421     return 0;
1422 }
1423
1424 /// Target times() function.
1425 template <class OS>
1426 SyscallReturn
1427 timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1428            ThreadContext *tc)
1429 {
1430     int index = 0;
1431     TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1432
1433     // Fill in the time structure (in clocks)
1434     int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1435     bufp->tms_utime = clocks;
1436     bufp->tms_stime = 0;
1437     bufp->tms_cutime = 0;
1438     bufp->tms_cstime = 0;
1439
1440     // Convert to host endianness
1441     bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1442
1443     // Write back
1444     bufp.copyOut(tc->getMemProxy());
1445
1446     // Return clock ticks since system boot
1447     return clocks;
1448 }
1449
1450 /// Target time() function.
1451 template <class OS>
1452 SyscallReturn
1453 timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1454            ThreadContext *tc)
1455 {
1456     typename OS::time_t sec, usec;
1457     getElapsedTime(sec, usec);
1458     sec += seconds_since_epoch;
1459
1460     int index = 0;
1461     Addr taddr = (Addr)process->getSyscallArg(tc, index);
1462     if(taddr != 0) {
1463         typename OS::time_t t = sec;
1464         t = TheISA::htog(t);
1465         SETranslatingPortProxy &p = tc->getMemProxy();
1466         p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1467     }
1468     return sec;
1469 }
1470
1471
1472 #endif // __SIM_SYSCALL_EMUL_HH__