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 /// Target getdents() handler.
 443 SyscallReturn getdentsFunc(SyscallDesc *desc, int num,
 444                            LiveProcess *process, ThreadContext *tc);
 445
 446 /// Target getdents64() handler.
 447 SyscallReturn getdents64Func(SyscallDesc *desc, int num,
 448                              LiveProcess *process, ThreadContext *tc);
 449
 450
 451 /// Pseudo Funcs  - These functions use a different return convension,
 452 /// returning a second value in a register other than the normal return register
 453 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 454                              LiveProcess *process, ThreadContext *tc);
 455
 456 /// Target getpidPseudo() handler.
 457 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 458                                LiveProcess *p, ThreadContext *tc);
 459
 460 /// Target getuidPseudo() handler.
 461 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 462                                LiveProcess *p, ThreadContext *tc);
 463
 464 /// Target getgidPseudo() handler.
 465 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 466                                LiveProcess *p, ThreadContext *tc);
 467
 468
 469 /// A readable name for 1,000,000, for converting microseconds to seconds.
 470 const int one_million = 1000000;
 471
 472 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 473 /// by my reckoning.  We want to keep this a constant (not use the
 474 /// real-world time) to keep simulations repeatable.
 475 const unsigned seconds_since_epoch = 1000000000;
 476
 477 /// Helper function to convert current elapsed time to seconds and
 478 /// microseconds.
 479 template <class T1, class T2>
 480 void
 481 getElapsedTime(T1 &sec, T2 &usec)
 482 {
 483     int elapsed_usecs = curTick() / SimClock::Int::us;
 484     sec = elapsed_usecs / one_million;
 485     usec = elapsed_usecs % one_million;
 486 }
 487
 488 //////////////////////////////////////////////////////////////////////
 489 //
 490 // The following emulation functions are generic, but need to be
 491 // templated to account for differences in types, constants, etc.
 492 //
 493 //////////////////////////////////////////////////////////////////////
 494
 495 #if NO_STAT64
 496     typedef struct stat hst_stat;
 497     typedef struct stat hst_stat64;
 498 #else
 499     typedef struct stat hst_stat;
 500     typedef struct stat64 hst_stat64;
 501 #endif
 502
 503 //// Helper function to convert a host stat buffer to a target stat
 504 //// buffer.  Also copies the target buffer out to the simulated
 505 //// memory space.  Used by stat(), fstat(), and lstat().
 506
 507 template <typename target_stat, typename host_stat>
 508 static void
 509 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 510 {
 511     using namespace TheISA;
 512
 513     if (fakeTTY)
 514         tgt->st_dev = 0xA;
 515     else
 516         tgt->st_dev = host->st_dev;
 517     tgt->st_dev = TheISA::htog(tgt->st_dev);
 518     tgt->st_ino = host->st_ino;
 519     tgt->st_ino = TheISA::htog(tgt->st_ino);
 520     tgt->st_mode = host->st_mode;
 521     if (fakeTTY) {
 522         // Claim to be a character device
 523         tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
 524         tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
 525     }
 526     tgt->st_mode = TheISA::htog(tgt->st_mode);
 527     tgt->st_nlink = host->st_nlink;
 528     tgt->st_nlink = TheISA::htog(tgt->st_nlink);
 529     tgt->st_uid = host->st_uid;
 530     tgt->st_uid = TheISA::htog(tgt->st_uid);
 531     tgt->st_gid = host->st_gid;
 532     tgt->st_gid = TheISA::htog(tgt->st_gid);
 533     if (fakeTTY)
 534         tgt->st_rdev = 0x880d;
 535     else
 536         tgt->st_rdev = host->st_rdev;
 537     tgt->st_rdev = TheISA::htog(tgt->st_rdev);
 538     tgt->st_size = host->st_size;
 539     tgt->st_size = TheISA::htog(tgt->st_size);
 540     tgt->st_atimeX = host->st_atime;
 541     tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
 542     tgt->st_mtimeX = host->st_mtime;
 543     tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
 544     tgt->st_ctimeX = host->st_ctime;
 545     tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
 546     // Force the block size to be 8k. This helps to ensure buffered io works
 547     // consistently across different hosts.
 548     tgt->st_blksize = 0x2000;
 549     tgt->st_blksize = TheISA::htog(tgt->st_blksize);
 550     tgt->st_blocks = host->st_blocks;
 551     tgt->st_blocks = TheISA::htog(tgt->st_blocks);
 552 }
 553
 554 // Same for stat64
 555
 556 template <typename target_stat, typename host_stat64>
 557 static void
 558 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 559 {
 560     using namespace TheISA;
 561
 562     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 563 #if defined(STAT_HAVE_NSEC)
 564     tgt->st_atime_nsec = host->st_atime_nsec;
 565     tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
 566     tgt->st_mtime_nsec = host->st_mtime_nsec;
 567     tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
 568     tgt->st_ctime_nsec = host->st_ctime_nsec;
 569     tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
 570 #else
 571     tgt->st_atime_nsec = 0;
 572     tgt->st_mtime_nsec = 0;
 573     tgt->st_ctime_nsec = 0;
 574 #endif
 575 }
 576
 577 //Here are a couple convenience functions
 578 template<class OS>
 579 static void
 580 copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
 581         hst_stat *host, bool fakeTTY = false)
 582 {
 583     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 584     tgt_stat_buf tgt(addr);
 585     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 586     tgt.copyOut(mem);
 587 }
 588
 589 template<class OS>
 590 static void
 591 copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
 592         hst_stat64 *host, bool fakeTTY = false)
 593 {
 594     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 595     tgt_stat_buf tgt(addr);
 596     convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 597     tgt.copyOut(mem);
 598 }
 599
 600 /// Target ioctl() handler.  For the most part, programs call ioctl()
 601 /// only to find out if their stdout is a tty, to determine whether to
 602 /// do line or block buffering.  We always claim that output fds are
 603 /// not TTYs to provide repeatable results.
 604 template <class OS>
 605 SyscallReturn
 606 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 607           ThreadContext *tc)
 608 {
 609     int index = 0;
 610     int fd = process->getSyscallArg(tc, index);
 611     unsigned req = process->getSyscallArg(tc, index);
 612
 613     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 614
 615     if (fd < 0 || process->sim_fd(fd) < 0) {
 616         // doesn't map to any simulator fd: not a valid target fd
 617         return -EBADF;
 618     }
 619
 620     if (OS::isTtyReq(req)) {
 621         return -ENOTTY;
 622     }
 623
 624     warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
 625          fd, req, tc->pcState());
 626     return -ENOTTY;
 627 }
 628
 629 template <class OS>
 630 static SyscallReturn
 631 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 632          ThreadContext *tc, int index)
 633 {
 634     std::string path;
 635
 636     if (!tc->getMemProxy().tryReadString(path,
 637                 process->getSyscallArg(tc, index)))
 638         return -EFAULT;
 639
 640     if (path == "/dev/sysdev0") {
 641         // This is a memory-mapped high-resolution timer device on Alpha.
 642         // We don't support it, so just punt.
 643         warn("Ignoring open(%s, ...)\n", path);
 644         return -ENOENT;
 645     }
 646
 647     int tgtFlags = process->getSyscallArg(tc, index);
 648     int mode = process->getSyscallArg(tc, index);
 649     int hostFlags = 0;
 650
 651     // translate open flags
 652     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 653         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 654             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 655             hostFlags |= OS::openFlagTable[i].hostFlag;
 656         }
 657     }
 658
 659     // any target flags left?
 660     if (tgtFlags != 0)
 661         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 662
 663 #ifdef __CYGWIN32__
 664     hostFlags |= O_BINARY;
 665 #endif
 666
 667     // Adjust path for current working directory
 668     path = process->fullPath(path);
 669
 670     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 671
 672     int fd;
 673     int local_errno;
 674     if (startswith(path, "/proc/") || startswith(path, "/system/") ||
 675         startswith(path, "/platform/") || startswith(path, "/sys/")) {
 676         // It's a proc/sys entry and requires special handling
 677         fd = OS::openSpecialFile(path, process, tc);
 678         local_errno = ENOENT;
 679      } else {
 680         // open the file
 681         fd = open(path.c_str(), hostFlags, mode);
 682         local_errno = errno;
 683      }
 684
 685     if (fd == -1)
 686         return -local_errno;
 687
 688     return process->alloc_fd(fd, path.c_str(), hostFlags, mode, false);
 689 }
 690
 691 /// Target open() handler.
 692 template <class OS>
 693 SyscallReturn
 694 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 695          ThreadContext *tc)
 696 {
 697     return openFunc<OS>(desc, callnum, process, tc, 0);
 698 }
 699
 700 /// Target openat() handler.
 701 template <class OS>
 702 SyscallReturn
 703 openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 704          ThreadContext *tc)
 705 {
 706     int index = 0;
 707     int dirfd = process->getSyscallArg(tc, index);
 708     if (dirfd != OS::TGT_AT_FDCWD)
 709         warn("openat: first argument not AT_FDCWD; unlikely to work");
 710     return openFunc<OS>(desc, callnum, process, tc, 1);
 711 }
 712
 713 /// Target facessat() handler
 714 template <class OS>
 715 SyscallReturn
 716 faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 717         ThreadContext *tc)
 718 {
 719     int index = 0;
 720     int dirfd = process->getSyscallArg(tc, index);
 721     if (dirfd != OS::TGT_AT_FDCWD)
 722         warn("faccessat: first argument not AT_FDCWD; unlikely to work");
 723     return accessFunc(desc, callnum, process, tc, 1);
 724 }
 725
 726 /// Target readlinkat() handler
 727 template <class OS>
 728 SyscallReturn
 729 readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 730         ThreadContext *tc)
 731 {
 732     int index = 0;
 733     int dirfd = process->getSyscallArg(tc, index);
 734     if (dirfd != OS::TGT_AT_FDCWD)
 735         warn("openat: first argument not AT_FDCWD; unlikely to work");
 736     return readlinkFunc(desc, callnum, process, tc, 1);
 737 }
 738
 739 /// Target sysinfo() handler.
 740 template <class OS>
 741 SyscallReturn
 742 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 743          ThreadContext *tc)
 744 {
 745
 746     int index = 0;
 747     TypedBufferArg<typename OS::tgt_sysinfo>
 748         sysinfo(process->getSyscallArg(tc, index));
 749
 750     sysinfo->uptime=seconds_since_epoch;
 751     sysinfo->totalram=process->system->memSize();
 752
 753     sysinfo.copyOut(tc->getMemProxy());
 754
 755     return 0;
 756 }
 757
 758 /// Target chmod() handler.
 759 template <class OS>
 760 SyscallReturn
 761 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 762           ThreadContext *tc)
 763 {
 764     std::string path;
 765
 766     int index = 0;
 767     if (!tc->getMemProxy().tryReadString(path,
 768                 process->getSyscallArg(tc, index))) {
 769         return -EFAULT;
 770     }
 771
 772     uint32_t mode = process->getSyscallArg(tc, index);
 773     mode_t hostMode = 0;
 774
 775     // XXX translate mode flags via OS::something???
 776     hostMode = mode;
 777
 778     // Adjust path for current working directory
 779     path = process->fullPath(path);
 780
 781     // do the chmod
 782     int result = chmod(path.c_str(), hostMode);
 783     if (result < 0)
 784         return -errno;
 785
 786     return 0;
 787 }
 788
 789
 790 /// Target fchmod() handler.
 791 template <class OS>
 792 SyscallReturn
 793 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 794            ThreadContext *tc)
 795 {
 796     int index = 0;
 797     int fd = process->getSyscallArg(tc, index);
 798     if (fd < 0 || process->sim_fd(fd) < 0) {
 799         // doesn't map to any simulator fd: not a valid target fd
 800         return -EBADF;
 801     }
 802
 803     uint32_t mode = process->getSyscallArg(tc, index);
 804     mode_t hostMode = 0;
 805
 806     // XXX translate mode flags via OS::someting???
 807     hostMode = mode;
 808
 809     // do the fchmod
 810     int result = fchmod(process->sim_fd(fd), hostMode);
 811     if (result < 0)
 812         return -errno;
 813
 814     return 0;
 815 }
 816
 817 /// Target mremap() handler.
 818 template <class OS>
 819 SyscallReturn
 820 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
 821 {
 822     int index = 0;
 823     Addr start = process->getSyscallArg(tc, index);
 824     uint64_t old_length = process->getSyscallArg(tc, index);
 825     uint64_t new_length = process->getSyscallArg(tc, index);
 826     uint64_t flags = process->getSyscallArg(tc, index);
 827     uint64_t provided_address = 0;
 828     bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
 829
 830     if (use_provided_address)
 831         provided_address = process->getSyscallArg(tc, index);
 832
 833     if ((start % TheISA::PageBytes != 0) ||
 834         (new_length % TheISA::PageBytes != 0) ||
 835         (provided_address % TheISA::PageBytes != 0)) {
 836         warn("mremap failing: arguments not page aligned");
 837         return -EINVAL;
 838     }
 839
 840     if (new_length > old_length) {
 841         if ((start + old_length) == process->mmap_end &&
 842             (!use_provided_address || provided_address == start)) {
 843             uint64_t diff = new_length - old_length;
 844             process->allocateMem(process->mmap_end, diff);
 845             process->mmap_end += diff;
 846             return start;
 847         } else {
 848             if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
 849                 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
 850                 return -ENOMEM;
 851             } else {
 852                 uint64_t new_start = use_provided_address ?
 853                     provided_address : process->mmap_end;
 854                 process->pTable->remap(start, old_length, new_start);
 855                 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
 856                      new_start, new_start + new_length,
 857                      new_length - old_length);
 858                 // add on the remaining unallocated pages
 859                 process->allocateMem(new_start + old_length,
 860                                      new_length - old_length,
 861                                      use_provided_address /* clobber */);
 862                 if (!use_provided_address)
 863                     process->mmap_end += new_length;
 864                 if (use_provided_address &&
 865                     new_start + new_length > process->mmap_end) {
 866                     // something fishy going on here, at least notify the user
 867                     // @todo: increase mmap_end?
 868                     warn("mmap region limit exceeded with MREMAP_FIXED\n");
 869                 }
 870                 warn("returning %08p as start\n", new_start);
 871                 return new_start;
 872             }
 873         }
 874     } else {
 875         if (use_provided_address && provided_address != start)
 876             process->pTable->remap(start, new_length, provided_address);
 877         process->pTable->unmap(start + new_length, old_length - new_length);
 878         return use_provided_address ? provided_address : start;
 879     }
 880 }
 881
 882 /// Target stat() handler.
 883 template <class OS>
 884 SyscallReturn
 885 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 886          ThreadContext *tc)
 887 {
 888     std::string path;
 889
 890     int index = 0;
 891     if (!tc->getMemProxy().tryReadString(path,
 892                 process->getSyscallArg(tc, index))) {
 893         return -EFAULT;
 894     }
 895     Addr bufPtr = process->getSyscallArg(tc, index);
 896
 897     // Adjust path for current working directory
 898     path = process->fullPath(path);
 899
 900     struct stat hostBuf;
 901     int result = stat(path.c_str(), &hostBuf);
 902
 903     if (result < 0)
 904         return -errno;
 905
 906     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 907
 908     return 0;
 909 }
 910
 911
 912 /// Target stat64() handler.
 913 template <class OS>
 914 SyscallReturn
 915 stat64Func(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     Addr bufPtr = process->getSyscallArg(tc, index);
 925
 926     // Adjust path for current working directory
 927     path = process->fullPath(path);
 928
 929 #if NO_STAT64
 930     struct stat  hostBuf;
 931     int result = stat(path.c_str(), &hostBuf);
 932 #else
 933     struct stat64 hostBuf;
 934     int result = stat64(path.c_str(), &hostBuf);
 935 #endif
 936
 937     if (result < 0)
 938         return -errno;
 939
 940     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 941
 942     return 0;
 943 }
 944
 945
 946 /// Target fstatat64() handler.
 947 template <class OS>
 948 SyscallReturn
 949 fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 950               ThreadContext *tc)
 951 {
 952     int index = 0;
 953     int dirfd = process->getSyscallArg(tc, index);
 954     if (dirfd != OS::TGT_AT_FDCWD)
 955         warn("openat: first argument not AT_FDCWD; unlikely to work");
 956
 957     std::string path;
 958     if (!tc->getMemProxy().tryReadString(path,
 959                 process->getSyscallArg(tc, index)))
 960         return -EFAULT;
 961     Addr bufPtr = process->getSyscallArg(tc, index);
 962
 963     // Adjust path for current working directory
 964     path = process->fullPath(path);
 965
 966 #if NO_STAT64
 967     struct stat  hostBuf;
 968     int result = stat(path.c_str(), &hostBuf);
 969 #else
 970     struct stat64 hostBuf;
 971     int result = stat64(path.c_str(), &hostBuf);
 972 #endif
 973
 974     if (result < 0)
 975         return -errno;
 976
 977     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 978
 979     return 0;
 980 }
 981
 982
 983 /// Target fstat64() handler.
 984 template <class OS>
 985 SyscallReturn
 986 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 987             ThreadContext *tc)
 988 {
 989     int index = 0;
 990     int fd = process->getSyscallArg(tc, index);
 991     Addr bufPtr = process->getSyscallArg(tc, index);
 992     if (fd < 0 || process->sim_fd(fd) < 0) {
 993         // doesn't map to any simulator fd: not a valid target fd
 994         return -EBADF;
 995     }
 996
 997 #if NO_STAT64
 998     struct stat  hostBuf;
 999     int result = fstat(process->sim_fd(fd), &hostBuf);
1000 #else
1001     struct stat64  hostBuf;
1002     int result = fstat64(process->sim_fd(fd), &hostBuf);
1003 #endif
1004
1005     if (result < 0)
1006         return -errno;
1007
1008     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1009
1010     return 0;
1011 }
1012
1013
1014 /// Target lstat() handler.
1015 template <class OS>
1016 SyscallReturn
1017 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1018           ThreadContext *tc)
1019 {
1020     std::string path;
1021
1022     int index = 0;
1023     if (!tc->getMemProxy().tryReadString(path,
1024                 process->getSyscallArg(tc, index))) {
1025         return -EFAULT;
1026     }
1027     Addr bufPtr = process->getSyscallArg(tc, index);
1028
1029     // Adjust path for current working directory
1030     path = process->fullPath(path);
1031
1032     struct stat hostBuf;
1033     int result = lstat(path.c_str(), &hostBuf);
1034
1035     if (result < 0)
1036         return -errno;
1037
1038     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1039
1040     return 0;
1041 }
1042
1043 /// Target lstat64() handler.
1044 template <class OS>
1045 SyscallReturn
1046 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1047             ThreadContext *tc)
1048 {
1049     std::string path;
1050
1051     int index = 0;
1052     if (!tc->getMemProxy().tryReadString(path,
1053                 process->getSyscallArg(tc, index))) {
1054         return -EFAULT;
1055     }
1056     Addr bufPtr = process->getSyscallArg(tc, index);
1057
1058     // Adjust path for current working directory
1059     path = process->fullPath(path);
1060
1061 #if NO_STAT64
1062     struct stat hostBuf;
1063     int result = lstat(path.c_str(), &hostBuf);
1064 #else
1065     struct stat64 hostBuf;
1066     int result = lstat64(path.c_str(), &hostBuf);
1067 #endif
1068
1069     if (result < 0)
1070         return -errno;
1071
1072     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1073
1074     return 0;
1075 }
1076
1077 /// Target fstat() handler.
1078 template <class OS>
1079 SyscallReturn
1080 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1081           ThreadContext *tc)
1082 {
1083     int index = 0;
1084     int fd = process->sim_fd(process->getSyscallArg(tc, index));
1085     Addr bufPtr = process->getSyscallArg(tc, index);
1086
1087     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
1088
1089     if (fd < 0)
1090         return -EBADF;
1091
1092     struct stat hostBuf;
1093     int result = fstat(fd, &hostBuf);
1094
1095     if (result < 0)
1096         return -errno;
1097
1098     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (fd == 1));
1099
1100     return 0;
1101 }
1102
1103
1104 /// Target statfs() handler.
1105 template <class OS>
1106 SyscallReturn
1107 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1108            ThreadContext *tc)
1109 {
1110     std::string path;
1111
1112     int index = 0;
1113     if (!tc->getMemProxy().tryReadString(path,
1114                 process->getSyscallArg(tc, index))) {
1115         return -EFAULT;
1116     }
1117     Addr bufPtr = process->getSyscallArg(tc, index);
1118
1119     // Adjust path for current working directory
1120     path = process->fullPath(path);
1121
1122     struct statfs hostBuf;
1123     int result = statfs(path.c_str(), &hostBuf);
1124
1125     if (result < 0)
1126         return -errno;
1127
1128     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1129
1130     return 0;
1131 }
1132
1133
1134 /// Target fstatfs() handler.
1135 template <class OS>
1136 SyscallReturn
1137 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1138             ThreadContext *tc)
1139 {
1140     int index = 0;
1141     int fd = process->sim_fd(process->getSyscallArg(tc, index));
1142     Addr bufPtr = process->getSyscallArg(tc, index);
1143
1144     if (fd < 0)
1145         return -EBADF;
1146
1147     struct statfs hostBuf;
1148     int result = fstatfs(fd, &hostBuf);
1149
1150     if (result < 0)
1151         return -errno;
1152
1153     OS::copyOutStatfsBuf(tc->getMemProxy(), bufPtr, &hostBuf);
1154
1155     return 0;
1156 }
1157
1158
1159 /// Target writev() handler.
1160 template <class OS>
1161 SyscallReturn
1162 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1163            ThreadContext *tc)
1164 {
1165     int index = 0;
1166     int fd = process->getSyscallArg(tc, index);
1167     if (fd < 0 || process->sim_fd(fd) < 0) {
1168         // doesn't map to any simulator fd: not a valid target fd
1169         return -EBADF;
1170     }
1171
1172     SETranslatingPortProxy &p = tc->getMemProxy();
1173     uint64_t tiov_base = process->getSyscallArg(tc, index);
1174     size_t count = process->getSyscallArg(tc, index);
1175     struct iovec hiov[count];
1176     for (size_t i = 0; i < count; ++i) {
1177         typename OS::tgt_iovec tiov;
1178
1179         p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1180                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1181         hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1182         hiov[i].iov_base = new char [hiov[i].iov_len];
1183         p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1184                    hiov[i].iov_len);
1185     }
1186
1187     int result = writev(process->sim_fd(fd), hiov, count);
1188
1189     for (size_t i = 0; i < count; ++i)
1190         delete [] (char *)hiov[i].iov_base;
1191
1192     if (result < 0)
1193         return -errno;
1194
1195     return 0;
1196 }
1197
1198
1199 /// Target mmap() handler.
1200 ///
1201 /// We don't really handle mmap().  If the target is mmaping an
1202 /// anonymous region or /dev/zero, we can get away with doing basically
1203 /// nothing (since memory is initialized to zero and the simulator
1204 /// doesn't really check addresses anyway).
1205 ///
1206 template <class OS>
1207 SyscallReturn
1208 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1209 {
1210     int index = 0;
1211     Addr start = p->getSyscallArg(tc, index);
1212     uint64_t length = p->getSyscallArg(tc, index);
1213     index++; // int prot = p->getSyscallArg(tc, index);
1214     int flags = p->getSyscallArg(tc, index);
1215     int tgt_fd = p->getSyscallArg(tc, index);
1216     // int offset = p->getSyscallArg(tc, index);
1217
1218     if (length > 0x100000000ULL)
1219         warn("mmap length argument %#x is unreasonably large.\n", length);
1220
1221     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
1222         Process::FdMap *fd_map = p->sim_fd_obj(tgt_fd);
1223         if (!fd_map || fd_map->fd < 0) {
1224             warn("mmap failing: target fd %d is not valid\n", tgt_fd);
1225             return -EBADF;
1226         }
1227
1228         if (fd_map->filename != "/dev/zero") {
1229             // This is very likely broken, but leave a warning here
1230             // (rather than panic) in case /dev/zero is known by
1231             // another name on some platform
1232             warn("allowing mmap of file %s; mmap not supported on files"
1233                  " other than /dev/zero\n", fd_map->filename);
1234         }
1235     }
1236
1237     if ((start  % TheISA::PageBytes) != 0 ||
1238         (length % TheISA::PageBytes) != 0) {
1239         warn("mmap failing: arguments not page-aligned: "
1240              "start 0x%x length 0x%x",
1241              start, length);
1242         return -EINVAL;
1243     }
1244
1245     // are we ok with clobbering existing mappings?  only set this to
1246     // true if the user has been warned.
1247     bool clobber = false;
1248
1249     // try to use the caller-provided address if there is one
1250     bool use_provided_address = (start != 0);
1251
1252     if (use_provided_address) {
1253         // check to see if the desired address is already in use
1254         if (!p->pTable->isUnmapped(start, length)) {
1255             // there are existing mappings in the desired range
1256             // whether we clobber them or not depends on whether the caller
1257             // specified MAP_FIXED
1258             if (flags & OS::TGT_MAP_FIXED) {
1259                 // MAP_FIXED specified: clobber existing mappings
1260                 warn("mmap: MAP_FIXED at 0x%x overwrites existing mappings\n",
1261                      start);
1262                 clobber = true;
1263             } else {
1264                 // MAP_FIXED not specified: ignore suggested start address
1265                 warn("mmap: ignoring suggested map address 0x%x\n", start);
1266                 use_provided_address = false;
1267             }
1268         }
1269     }
1270
1271     if (!use_provided_address) {
1272         // no address provided, or provided address unusable:
1273         // pick next address from our "mmap region"
1274         if (OS::mmapGrowsDown()) {
1275             start = p->mmap_end - length;
1276             p->mmap_end = start;
1277         } else {
1278             start = p->mmap_end;
1279             p->mmap_end += length;
1280         }
1281     }
1282
1283     p->allocateMem(start, length, clobber);
1284
1285     return start;
1286 }
1287
1288 /// Target getrlimit() handler.
1289 template <class OS>
1290 SyscallReturn
1291 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1292         ThreadContext *tc)
1293 {
1294     int index = 0;
1295     unsigned resource = process->getSyscallArg(tc, index);
1296     TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1297
1298     switch (resource) {
1299         case OS::TGT_RLIMIT_STACK:
1300             // max stack size in bytes: make up a number (8MB for now)
1301             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1302             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1303             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1304             break;
1305
1306         case OS::TGT_RLIMIT_DATA:
1307             // max data segment size in bytes: make up a number
1308             rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1309             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1310             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1311             break;
1312
1313         default:
1314             std::cerr << "getrlimitFunc: unimplemented resource " << resource
1315                 << std::endl;
1316             abort();
1317             break;
1318     }
1319
1320     rlp.copyOut(tc->getMemProxy());
1321     return 0;
1322 }
1323
1324 /// Target gettimeofday() handler.
1325 template <class OS>
1326 SyscallReturn
1327 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1328         ThreadContext *tc)
1329 {
1330     int index = 0;
1331     TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1332
1333     getElapsedTime(tp->tv_sec, tp->tv_usec);
1334     tp->tv_sec += seconds_since_epoch;
1335     tp->tv_sec = TheISA::htog(tp->tv_sec);
1336     tp->tv_usec = TheISA::htog(tp->tv_usec);
1337
1338     tp.copyOut(tc->getMemProxy());
1339
1340     return 0;
1341 }
1342
1343
1344 /// Target utimes() handler.
1345 template <class OS>
1346 SyscallReturn
1347 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1348            ThreadContext *tc)
1349 {
1350     std::string path;
1351
1352     int index = 0;
1353     if (!tc->getMemProxy().tryReadString(path,
1354                 process->getSyscallArg(tc, index))) {
1355         return -EFAULT;
1356     }
1357
1358     TypedBufferArg<typename OS::timeval [2]>
1359         tp(process->getSyscallArg(tc, index));
1360     tp.copyIn(tc->getMemProxy());
1361
1362     struct timeval hostTimeval[2];
1363     for (int i = 0; i < 2; ++i)
1364     {
1365         hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1366         hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1367     }
1368
1369     // Adjust path for current working directory
1370     path = process->fullPath(path);
1371
1372     int result = utimes(path.c_str(), hostTimeval);
1373
1374     if (result < 0)
1375         return -errno;
1376
1377     return 0;
1378 }
1379 /// Target getrusage() function.
1380 template <class OS>
1381 SyscallReturn
1382 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1383               ThreadContext *tc)
1384 {
1385     int index = 0;
1386     int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1387     TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1388
1389     rup->ru_utime.tv_sec = 0;
1390     rup->ru_utime.tv_usec = 0;
1391     rup->ru_stime.tv_sec = 0;
1392     rup->ru_stime.tv_usec = 0;
1393     rup->ru_maxrss = 0;
1394     rup->ru_ixrss = 0;
1395     rup->ru_idrss = 0;
1396     rup->ru_isrss = 0;
1397     rup->ru_minflt = 0;
1398     rup->ru_majflt = 0;
1399     rup->ru_nswap = 0;
1400     rup->ru_inblock = 0;
1401     rup->ru_oublock = 0;
1402     rup->ru_msgsnd = 0;
1403     rup->ru_msgrcv = 0;
1404     rup->ru_nsignals = 0;
1405     rup->ru_nvcsw = 0;
1406     rup->ru_nivcsw = 0;
1407
1408     switch (who) {
1409       case OS::TGT_RUSAGE_SELF:
1410         getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1411         rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1412         rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1413         break;
1414
1415       case OS::TGT_RUSAGE_CHILDREN:
1416         // do nothing.  We have no child processes, so they take no time.
1417         break;
1418
1419       default:
1420         // don't really handle THREAD or CHILDREN, but just warn and
1421         // plow ahead
1422         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1423              who);
1424     }
1425
1426     rup.copyOut(tc->getMemProxy());
1427
1428     return 0;
1429 }
1430
1431 /// Target times() function.
1432 template <class OS>
1433 SyscallReturn
1434 timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1435            ThreadContext *tc)
1436 {
1437     int index = 0;
1438     TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1439
1440     // Fill in the time structure (in clocks)
1441     int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1442     bufp->tms_utime = clocks;
1443     bufp->tms_stime = 0;
1444     bufp->tms_cutime = 0;
1445     bufp->tms_cstime = 0;
1446
1447     // Convert to host endianness
1448     bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1449
1450     // Write back
1451     bufp.copyOut(tc->getMemProxy());
1452
1453     // Return clock ticks since system boot
1454     return clocks;
1455 }
1456
1457 /// Target time() function.
1458 template <class OS>
1459 SyscallReturn
1460 timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1461            ThreadContext *tc)
1462 {
1463     typename OS::time_t sec, usec;
1464     getElapsedTime(sec, usec);
1465     sec += seconds_since_epoch;
1466
1467     int index = 0;
1468     Addr taddr = (Addr)process->getSyscallArg(tc, index);
1469     if(taddr != 0) {
1470         typename OS::time_t t = sec;
1471         t = TheISA::htog(t);
1472         SETranslatingPortProxy &p = tc->getMemProxy();
1473         p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1474     }
1475     return sec;
1476 }
1477
1478
1479 #endif // __SIM_SYSCALL_EMUL_HH__