src/sim/syscall_emul.hh

   1 /*
   2  * Copyright (c) 2012-2013, 2015 ARM Limited
   3  * Copyright (c) 2015 Advanced Micro Devices, Inc.
   4  * All rights reserved
   5  *
   6  * The license below extends only to copyright in the software and shall
   7  * not be construed as granting a license to any other intellectual
   8  * property including but not limited to intellectual property relating
   9  * to a hardware implementation of the functionality of the software
  10  * licensed hereunder.  You may use the software subject to the license
  11  * terms below provided that you ensure that this notice is replicated
  12  * unmodified and in its entirety in all distributions of the software,
  13  * modified or unmodified, in source code or in binary form.
  14  *
  15  * Copyright (c) 2003-2005 The Regents of The University of Michigan
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions are
  20  * met: redistributions of source code must retain the above copyright
  21  * notice, this list of conditions and the following disclaimer;
  22  * redistributions in binary form must reproduce the above copyright
  23  * notice, this list of conditions and the following disclaimer in the
  24  * documentation and/or other materials provided with the distribution;
  25  * neither the name of the copyright holders nor the names of its
  26  * contributors may be used to endorse or promote products derived from
  27  * this software without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  30  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  31  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  32  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  33  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  34  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  35  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  36  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  37  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  38  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  39  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  40  *
  41  * Authors: Steve Reinhardt
  42  *          Kevin Lim
  43  */
  44
  45 #ifndef __SIM_SYSCALL_EMUL_HH__
  46 #define __SIM_SYSCALL_EMUL_HH__
  47
  48 #define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
  49   defined(__FreeBSD__) || defined(__CYGWIN__) || \
  50   defined(__NetBSD__))
  51
  52 #define NO_STATFS (defined(__APPLE__) || defined(__OpenBSD__) || \
  53   defined(__FreeBSD__) || defined(__NetBSD__))
  54
  55 #define NO_FALLOCATE (defined(__APPLE__) || defined(__OpenBSD__) || \
  56   defined(__FreeBSD__) || defined(__NetBSD__))
  57
  58 ///
  59 /// @file syscall_emul.hh
  60 ///
  61 /// This file defines objects used to emulate syscalls from the target
  62 /// application on the host machine.
  63
  64 #ifdef __CYGWIN32__
  65 #include <sys/fcntl.h>
  66
  67 #endif
  68 #include <fcntl.h>
  69 #include <sys/mman.h>
  70 #include <sys/stat.h>
  71 #if (NO_STATFS == 0)
  72 #include <sys/statfs.h>
  73 #endif
  74 #include <sys/time.h>
  75 #include <sys/uio.h>
  76 #include <unistd.h>
  77
  78 #include <cerrno>
  79 #include <string>
  80
  81 #include "base/intmath.hh"
  82 #include "base/loader/object_file.hh"
  83 #include "base/misc.hh"
  84 #include "base/trace.hh"
  85 #include "base/types.hh"
  86 #include "config/the_isa.hh"
  87 #include "cpu/base.hh"
  88 #include "cpu/thread_context.hh"
  89 #include "mem/page_table.hh"
  90 #include "sim/emul_driver.hh"
  91 #include "sim/process.hh"
  92 #include "sim/syscall_debug_macros.hh"
  93 #include "sim/syscall_emul_buf.hh"
  94 #include "sim/syscall_return.hh"
  95
  96 class SyscallDesc;
  97
  98 //////////////////////////////////////////////////////////////////////
  99 //
 100 // The following emulation functions are generic enough that they
 101 // don't need to be recompiled for different emulated OS's.  They are
 102 // defined in sim/syscall_emul.cc.
 103 //
 104 //////////////////////////////////////////////////////////////////////
 105
 106
 107 /// Handler for unimplemented syscalls that we haven't thought about.
 108 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 109                                 LiveProcess *p, ThreadContext *tc);
 110
 111 /// Handler for unimplemented syscalls that we never intend to
 112 /// implement (signal handling, etc.) and should not affect the correct
 113 /// behavior of the program.  Print a warning only if the appropriate
 114 /// trace flag is enabled.  Return success to the target program.
 115 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 116                          LiveProcess *p, ThreadContext *tc);
 117
 118 // Target fallocateFunc() handler.
 119 SyscallReturn fallocateFunc(SyscallDesc *desc, int num,
 120                             LiveProcess *p, ThreadContext *tc);
 121
 122 /// Target exit() handler: terminate current context.
 123 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 124                        LiveProcess *p, ThreadContext *tc);
 125
 126 /// Target exit_group() handler: terminate simulation. (exit all threads)
 127 SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
 128                        LiveProcess *p, ThreadContext *tc);
 129
 130 /// Target getpagesize() handler.
 131 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 132                               LiveProcess *p, ThreadContext *tc);
 133
 134 /// Target brk() handler: set brk address.
 135 SyscallReturn brkFunc(SyscallDesc *desc, int num,
 136                       LiveProcess *p, ThreadContext *tc);
 137
 138 /// Target close() handler.
 139 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 140                         LiveProcess *p, ThreadContext *tc);
 141
 142 /// Target read() handler.
 143 SyscallReturn readFunc(SyscallDesc *desc, int num,
 144                        LiveProcess *p, ThreadContext *tc);
 145
 146 /// Target write() handler.
 147 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 148                         LiveProcess *p, ThreadContext *tc);
 149
 150 /// Target lseek() handler.
 151 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 152                         LiveProcess *p, ThreadContext *tc);
 153
 154 /// Target _llseek() handler.
 155 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
 156                           LiveProcess *p, ThreadContext *tc);
 157
 158 /// Target munmap() handler.
 159 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 160                          LiveProcess *p, ThreadContext *tc);
 161
 162 /// Target gethostname() handler.
 163 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 164                               LiveProcess *p, ThreadContext *tc);
 165
 166 /// Target getcwd() handler.
 167 SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
 168                          LiveProcess *p, ThreadContext *tc);
 169
 170 /// Target readlink() handler.
 171 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 172                            LiveProcess *p, ThreadContext *tc,
 173                            int index = 0);
 174 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 175                            LiveProcess *p, ThreadContext *tc);
 176
 177 /// Target unlink() handler.
 178 SyscallReturn unlinkHelper(SyscallDesc *desc, int num,
 179                            LiveProcess *p, ThreadContext *tc,
 180                            int index);
 181 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 182                          LiveProcess *p, ThreadContext *tc);
 183
 184 /// Target mkdir() handler.
 185 SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
 186                         LiveProcess *p, ThreadContext *tc);
 187
 188 /// Target rename() handler.
 189 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 190                          LiveProcess *p, ThreadContext *tc);
 191
 192
 193 /// Target truncate() handler.
 194 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 195                            LiveProcess *p, ThreadContext *tc);
 196
 197
 198 /// Target ftruncate() handler.
 199 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 200                             LiveProcess *p, ThreadContext *tc);
 201
 202
 203 /// Target truncate64() handler.
 204 SyscallReturn truncate64Func(SyscallDesc *desc, int num,
 205                              LiveProcess *p, ThreadContext *tc);
 206
 207 /// Target ftruncate64() handler.
 208 SyscallReturn ftruncate64Func(SyscallDesc *desc, int num,
 209                               LiveProcess *p, ThreadContext *tc);
 210
 211
 212 /// Target umask() handler.
 213 SyscallReturn umaskFunc(SyscallDesc *desc, int num,
 214                         LiveProcess *p, ThreadContext *tc);
 215
 216
 217 /// Target chown() handler.
 218 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 219                         LiveProcess *p, ThreadContext *tc);
 220
 221
 222 /// Target fchown() handler.
 223 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 224                          LiveProcess *p, ThreadContext *tc);
 225
 226 /// Target dup() handler.
 227 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 228                       LiveProcess *process, ThreadContext *tc);
 229
 230 /// Target fnctl() handler.
 231 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 232                         LiveProcess *process, ThreadContext *tc);
 233
 234 /// Target fcntl64() handler.
 235 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 236                           LiveProcess *process, ThreadContext *tc);
 237
 238 /// Target setuid() handler.
 239 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 240                          LiveProcess *p, ThreadContext *tc);
 241
 242 /// Target getpid() handler.
 243 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 244                          LiveProcess *p, ThreadContext *tc);
 245
 246 /// Target getuid() handler.
 247 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 248                          LiveProcess *p, ThreadContext *tc);
 249
 250 /// Target getgid() handler.
 251 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 252                          LiveProcess *p, ThreadContext *tc);
 253
 254 /// Target getppid() handler.
 255 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 256                           LiveProcess *p, ThreadContext *tc);
 257
 258 /// Target geteuid() handler.
 259 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 260                           LiveProcess *p, ThreadContext *tc);
 261
 262 /// Target getegid() handler.
 263 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 264                           LiveProcess *p, ThreadContext *tc);
 265
 266 /// Target clone() handler.
 267 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
 268                         LiveProcess *p, ThreadContext *tc);
 269
 270 /// Target access() handler
 271 SyscallReturn accessFunc(SyscallDesc *desc, int num,
 272                                LiveProcess *p, ThreadContext *tc);
 273 SyscallReturn accessFunc(SyscallDesc *desc, int num,
 274                                LiveProcess *p, ThreadContext *tc,
 275                                int index);
 276
 277 /// Futex system call
 278 ///  Implemented by Daniel Sanchez
 279 ///  Used by printf's in multi-threaded apps
 280 template <class OS>
 281 SyscallReturn
 282 futexFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 283           ThreadContext *tc)
 284 {
 285     int index_uaddr = 0;
 286     int index_op = 1;
 287     int index_val = 2;
 288     int index_timeout = 3;
 289
 290     uint64_t uaddr = process->getSyscallArg(tc, index_uaddr);
 291     int op = process->getSyscallArg(tc, index_op);
 292     int val = process->getSyscallArg(tc, index_val);
 293     uint64_t timeout = process->getSyscallArg(tc, index_timeout);
 294
 295     std::map<uint64_t, std::list<ThreadContext *> * >
 296         &futex_map = tc->getSystemPtr()->futexMap;
 297
 298     DPRINTF(SyscallVerbose, "In sys_futex: Address=%llx, op=%d, val=%d\n",
 299             uaddr, op, val);
 300
 301     op &= ~OS::TGT_FUTEX_PRIVATE_FLAG;
 302
 303     if (op == OS::TGT_FUTEX_WAIT) {
 304         if (timeout != 0) {
 305             warn("sys_futex: FUTEX_WAIT with non-null timeout unimplemented;"
 306                  "we'll wait indefinitely");
 307         }
 308
 309         uint8_t *buf = new uint8_t[sizeof(int)];
 310         tc->getMemProxy().readBlob((Addr)uaddr, buf, (int)sizeof(int));
 311         int mem_val = *((int *)buf);
 312         delete[] buf;
 313
 314         if (val != mem_val) {
 315             DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, read: %d, "
 316                                     "expected: %d\n", mem_val, val);
 317             return -OS::TGT_EWOULDBLOCK;
 318         }
 319
 320         // Queue the thread context
 321         std::list<ThreadContext *> * tcWaitList;
 322         if (futex_map.count(uaddr)) {
 323             tcWaitList = futex_map.find(uaddr)->second;
 324         } else {
 325             tcWaitList = new std::list<ThreadContext *>();
 326             futex_map.insert(std::pair< uint64_t,
 327                             std::list<ThreadContext *> * >(uaddr, tcWaitList));
 328         }
 329         tcWaitList->push_back(tc);
 330         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAIT, suspending calling "
 331                                 "thread context\n");
 332         tc->suspend();
 333         return 0;
 334     } else if (op == OS::TGT_FUTEX_WAKE){
 335         int wokenUp = 0;
 336         std::list<ThreadContext *> * tcWaitList;
 337         if (futex_map.count(uaddr)) {
 338             tcWaitList = futex_map.find(uaddr)->second;
 339             while (tcWaitList->size() > 0 && wokenUp < val) {
 340                 tcWaitList->front()->activate();
 341                 tcWaitList->pop_front();
 342                 wokenUp++;
 343             }
 344             if (tcWaitList->empty()) {
 345                 futex_map.erase(uaddr);
 346                 delete tcWaitList;
 347             }
 348         }
 349         DPRINTF(SyscallVerbose, "sys_futex: FUTEX_WAKE, activated %d waiting "
 350                                 "thread contexts\n", wokenUp);
 351         return wokenUp;
 352     } else {
 353         warn("sys_futex: op %d is not implemented, just returning...", op);
 354         return 0;
 355     }
 356
 357 }
 358
 359
 360 /// Pseudo Funcs  - These functions use a different return convension,
 361 /// returning a second value in a register other than the normal return register
 362 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 363                              LiveProcess *process, ThreadContext *tc);
 364
 365 /// Target getpidPseudo() handler.
 366 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 367                                LiveProcess *p, ThreadContext *tc);
 368
 369 /// Target getuidPseudo() handler.
 370 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 371                                LiveProcess *p, ThreadContext *tc);
 372
 373 /// Target getgidPseudo() handler.
 374 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 375                                LiveProcess *p, ThreadContext *tc);
 376
 377
 378 /// A readable name for 1,000,000, for converting microseconds to seconds.
 379 const int one_million = 1000000;
 380 /// A readable name for 1,000,000,000, for converting nanoseconds to seconds.
 381 const int one_billion = 1000000000;
 382
 383 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 384 /// by my reckoning.  We want to keep this a constant (not use the
 385 /// real-world time) to keep simulations repeatable.
 386 const unsigned seconds_since_epoch = 1000000000;
 387
 388 /// Helper function to convert current elapsed time to seconds and
 389 /// microseconds.
 390 template <class T1, class T2>
 391 void
 392 getElapsedTimeMicro(T1 &sec, T2 &usec)
 393 {
 394     uint64_t elapsed_usecs = curTick() / SimClock::Int::us;
 395     sec = elapsed_usecs / one_million;
 396     usec = elapsed_usecs % one_million;
 397 }
 398
 399 /// Helper function to convert current elapsed time to seconds and
 400 /// nanoseconds.
 401 template <class T1, class T2>
 402 void
 403 getElapsedTimeNano(T1 &sec, T2 &nsec)
 404 {
 405     uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns;
 406     sec = elapsed_nsecs / one_billion;
 407     nsec = elapsed_nsecs % one_billion;
 408 }
 409
 410 //////////////////////////////////////////////////////////////////////
 411 //
 412 // The following emulation functions are generic, but need to be
 413 // templated to account for differences in types, constants, etc.
 414 //
 415 //////////////////////////////////////////////////////////////////////
 416
 417     typedef struct statfs hst_statfs;
 418 #if NO_STAT64
 419     typedef struct stat hst_stat;
 420     typedef struct stat hst_stat64;
 421 #else
 422     typedef struct stat hst_stat;
 423     typedef struct stat64 hst_stat64;
 424 #endif
 425
 426 //// Helper function to convert a host stat buffer to a target stat
 427 //// buffer.  Also copies the target buffer out to the simulated
 428 //// memory space.  Used by stat(), fstat(), and lstat().
 429
 430 template <typename target_stat, typename host_stat>
 431 static void
 432 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 433 {
 434     using namespace TheISA;
 435
 436     if (fakeTTY)
 437         tgt->st_dev = 0xA;
 438     else
 439         tgt->st_dev = host->st_dev;
 440     tgt->st_dev = TheISA::htog(tgt->st_dev);
 441     tgt->st_ino = host->st_ino;
 442     tgt->st_ino = TheISA::htog(tgt->st_ino);
 443     tgt->st_mode = host->st_mode;
 444     if (fakeTTY) {
 445         // Claim to be a character device
 446         tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
 447         tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
 448     }
 449     tgt->st_mode = TheISA::htog(tgt->st_mode);
 450     tgt->st_nlink = host->st_nlink;
 451     tgt->st_nlink = TheISA::htog(tgt->st_nlink);
 452     tgt->st_uid = host->st_uid;
 453     tgt->st_uid = TheISA::htog(tgt->st_uid);
 454     tgt->st_gid = host->st_gid;
 455     tgt->st_gid = TheISA::htog(tgt->st_gid);
 456     if (fakeTTY)
 457         tgt->st_rdev = 0x880d;
 458     else
 459         tgt->st_rdev = host->st_rdev;
 460     tgt->st_rdev = TheISA::htog(tgt->st_rdev);
 461     tgt->st_size = host->st_size;
 462     tgt->st_size = TheISA::htog(tgt->st_size);
 463     tgt->st_atimeX = host->st_atime;
 464     tgt->st_atimeX = TheISA::htog(tgt->st_atimeX);
 465     tgt->st_mtimeX = host->st_mtime;
 466     tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX);
 467     tgt->st_ctimeX = host->st_ctime;
 468     tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX);
 469     // Force the block size to be 8k. This helps to ensure buffered io works
 470     // consistently across different hosts.
 471     tgt->st_blksize = 0x2000;
 472     tgt->st_blksize = TheISA::htog(tgt->st_blksize);
 473     tgt->st_blocks = host->st_blocks;
 474     tgt->st_blocks = TheISA::htog(tgt->st_blocks);
 475 }
 476
 477 // Same for stat64
 478
 479 template <typename target_stat, typename host_stat64>
 480 static void
 481 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 482 {
 483     using namespace TheISA;
 484
 485     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 486 #if defined(STAT_HAVE_NSEC)
 487     tgt->st_atime_nsec = host->st_atime_nsec;
 488     tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec);
 489     tgt->st_mtime_nsec = host->st_mtime_nsec;
 490     tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec);
 491     tgt->st_ctime_nsec = host->st_ctime_nsec;
 492     tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec);
 493 #else
 494     tgt->st_atime_nsec = 0;
 495     tgt->st_mtime_nsec = 0;
 496     tgt->st_ctime_nsec = 0;
 497 #endif
 498 }
 499
 500 //Here are a couple convenience functions
 501 template<class OS>
 502 static void
 503 copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr,
 504         hst_stat *host, bool fakeTTY = false)
 505 {
 506     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 507     tgt_stat_buf tgt(addr);
 508     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 509     tgt.copyOut(mem);
 510 }
 511
 512 template<class OS>
 513 static void
 514 copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr,
 515         hst_stat64 *host, bool fakeTTY = false)
 516 {
 517     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 518     tgt_stat_buf tgt(addr);
 519     convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 520     tgt.copyOut(mem);
 521 }
 522
 523 template <class OS>
 524 static void
 525 copyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr,
 526                  hst_statfs *host)
 527 {
 528     TypedBufferArg<typename OS::tgt_statfs> tgt(addr);
 529
 530 #if defined(__OpenBSD__) || defined(__APPLE__) || defined(__FreeBSD__)
 531     tgt->f_type = 0;
 532 #else
 533     tgt->f_type = TheISA::htog(host->f_type);
 534 #endif
 535     tgt->f_bsize = TheISA::htog(host->f_bsize);
 536     tgt->f_blocks = TheISA::htog(host->f_blocks);
 537     tgt->f_bfree = TheISA::htog(host->f_bfree);
 538     tgt->f_bavail = TheISA::htog(host->f_bavail);
 539     tgt->f_files = TheISA::htog(host->f_files);
 540     tgt->f_ffree = TheISA::htog(host->f_ffree);
 541     memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid));
 542     tgt->f_namelen = TheISA::htog(host->f_namelen);
 543     tgt->f_frsize = TheISA::htog(host->f_frsize);
 544     memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare));
 545
 546     tgt.copyOut(mem);
 547 }
 548
 549 /// Target ioctl() handler.  For the most part, programs call ioctl()
 550 /// only to find out if their stdout is a tty, to determine whether to
 551 /// do line or block buffering.  We always claim that output fds are
 552 /// not TTYs to provide repeatable results.
 553 template <class OS>
 554 SyscallReturn
 555 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 556           ThreadContext *tc)
 557 {
 558     int index = 0;
 559     int tgt_fd = process->getSyscallArg(tc, index);
 560     unsigned req = process->getSyscallArg(tc, index);
 561
 562     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req);
 563
 564     FDEntry *fde = process->getFDEntry(tgt_fd);
 565
 566     if (fde == NULL) {
 567         // doesn't map to any simulator fd: not a valid target fd
 568         return -EBADF;
 569     }
 570
 571     if (fde->driver != NULL) {
 572         return fde->driver->ioctl(process, tc, req);
 573     }
 574
 575     if (OS::isTtyReq(req)) {
 576         return -ENOTTY;
 577     }
 578
 579     warn("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ \n",
 580          tgt_fd, req, tc->pcState());
 581     return -ENOTTY;
 582 }
 583
 584 template <class OS>
 585 static SyscallReturn
 586 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 587          ThreadContext *tc, int index)
 588 {
 589     std::string path;
 590
 591     if (!tc->getMemProxy().tryReadString(path,
 592                 process->getSyscallArg(tc, index)))
 593         return -EFAULT;
 594
 595     int tgtFlags = process->getSyscallArg(tc, index);
 596     int mode = process->getSyscallArg(tc, index);
 597     int hostFlags = 0;
 598
 599     // translate open flags
 600     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 601         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 602             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 603             hostFlags |= OS::openFlagTable[i].hostFlag;
 604         }
 605     }
 606
 607     // any target flags left?
 608     if (tgtFlags != 0)
 609         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 610
 611 #ifdef __CYGWIN32__
 612     hostFlags |= O_BINARY;
 613 #endif
 614
 615     // Adjust path for current working directory
 616     path = process->fullPath(path);
 617
 618     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 619
 620     if (startswith(path, "/dev/")) {
 621         std::string filename = path.substr(strlen("/dev/"));
 622         if (filename == "sysdev0") {
 623             // This is a memory-mapped high-resolution timer device on Alpha.
 624             // We don't support it, so just punt.
 625             warn("Ignoring open(%s, ...)\n", path);
 626             return -ENOENT;
 627         }
 628
 629         EmulatedDriver *drv = process->findDriver(filename);
 630         if (drv != NULL) {
 631             // the driver's open method will allocate a fd from the
 632             // process if necessary.
 633             return drv->open(process, tc, mode, hostFlags);
 634         }
 635
 636         // fall through here for pass through to host devices, such as
 637         // /dev/zero
 638     }
 639
 640     int fd;
 641     int local_errno;
 642     if (startswith(path, "/proc/") || startswith(path, "/system/") ||
 643         startswith(path, "/platform/") || startswith(path, "/sys/")) {
 644         // It's a proc/sys entry and requires special handling
 645         fd = OS::openSpecialFile(path, process, tc);
 646         local_errno = ENOENT;
 647      } else {
 648         // open the file
 649         fd = open(path.c_str(), hostFlags, mode);
 650         local_errno = errno;
 651      }
 652
 653     if (fd == -1)
 654         return -local_errno;
 655
 656     return process->allocFD(fd, path.c_str(), hostFlags, mode, false);
 657 }
 658
 659 /// Target open() handler.
 660 template <class OS>
 661 SyscallReturn
 662 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 663          ThreadContext *tc)
 664 {
 665     return openFunc<OS>(desc, callnum, process, tc, 0);
 666 }
 667
 668 /// Target openat() handler.
 669 template <class OS>
 670 SyscallReturn
 671 openatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 672          ThreadContext *tc)
 673 {
 674     int index = 0;
 675     int dirfd = process->getSyscallArg(tc, index);
 676     if (dirfd != OS::TGT_AT_FDCWD)
 677         warn("openat: first argument not AT_FDCWD; unlikely to work");
 678     return openFunc<OS>(desc, callnum, process, tc, 1);
 679 }
 680
 681 /// Target unlinkat() handler.
 682 template <class OS>
 683 SyscallReturn
 684 unlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 685              ThreadContext *tc)
 686 {
 687     int index = 0;
 688     int dirfd = process->getSyscallArg(tc, index);
 689     if (dirfd != OS::TGT_AT_FDCWD)
 690         warn("unlinkat: first argument not AT_FDCWD; unlikely to work");
 691
 692     return unlinkHelper(desc, callnum, process, tc, 1);
 693 }
 694
 695 /// Target facessat() handler
 696 template <class OS>
 697 SyscallReturn
 698 faccessatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 699         ThreadContext *tc)
 700 {
 701     int index = 0;
 702     int dirfd = process->getSyscallArg(tc, index);
 703     if (dirfd != OS::TGT_AT_FDCWD)
 704         warn("faccessat: first argument not AT_FDCWD; unlikely to work");
 705     return accessFunc(desc, callnum, process, tc, 1);
 706 }
 707
 708 /// Target readlinkat() handler
 709 template <class OS>
 710 SyscallReturn
 711 readlinkatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 712         ThreadContext *tc)
 713 {
 714     int index = 0;
 715     int dirfd = process->getSyscallArg(tc, index);
 716     if (dirfd != OS::TGT_AT_FDCWD)
 717         warn("openat: first argument not AT_FDCWD; unlikely to work");
 718     return readlinkFunc(desc, callnum, process, tc, 1);
 719 }
 720
 721 /// Target renameat() handler.
 722 template <class OS>
 723 SyscallReturn
 724 renameatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 725              ThreadContext *tc)
 726 {
 727     int index = 0;
 728
 729     int olddirfd = process->getSyscallArg(tc, index);
 730     if (olddirfd != OS::TGT_AT_FDCWD)
 731         warn("renameat: first argument not AT_FDCWD; unlikely to work");
 732
 733     std::string old_name;
 734
 735     if (!tc->getMemProxy().tryReadString(old_name,
 736                                          process->getSyscallArg(tc, index)))
 737         return -EFAULT;
 738
 739     int newdirfd = process->getSyscallArg(tc, index);
 740     if (newdirfd != OS::TGT_AT_FDCWD)
 741         warn("renameat: third argument not AT_FDCWD; unlikely to work");
 742
 743     std::string new_name;
 744
 745     if (!tc->getMemProxy().tryReadString(new_name,
 746                                          process->getSyscallArg(tc, index)))
 747         return -EFAULT;
 748
 749     // Adjust path for current working directory
 750     old_name = process->fullPath(old_name);
 751     new_name = process->fullPath(new_name);
 752
 753     int result = rename(old_name.c_str(), new_name.c_str());
 754     return (result == -1) ? -errno : result;
 755 }
 756
 757 /// Target sysinfo() handler.
 758 template <class OS>
 759 SyscallReturn
 760 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 761          ThreadContext *tc)
 762 {
 763
 764     int index = 0;
 765     TypedBufferArg<typename OS::tgt_sysinfo>
 766         sysinfo(process->getSyscallArg(tc, index));
 767
 768     sysinfo->uptime = seconds_since_epoch;
 769     sysinfo->totalram = process->system->memSize();
 770     sysinfo->mem_unit = 1;
 771
 772     sysinfo.copyOut(tc->getMemProxy());
 773
 774     return 0;
 775 }
 776
 777 /// Target chmod() handler.
 778 template <class OS>
 779 SyscallReturn
 780 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 781           ThreadContext *tc)
 782 {
 783     std::string path;
 784
 785     int index = 0;
 786     if (!tc->getMemProxy().tryReadString(path,
 787                 process->getSyscallArg(tc, index))) {
 788         return -EFAULT;
 789     }
 790
 791     uint32_t mode = process->getSyscallArg(tc, index);
 792     mode_t hostMode = 0;
 793
 794     // XXX translate mode flags via OS::something???
 795     hostMode = mode;
 796
 797     // Adjust path for current working directory
 798     path = process->fullPath(path);
 799
 800     // do the chmod
 801     int result = chmod(path.c_str(), hostMode);
 802     if (result < 0)
 803         return -errno;
 804
 805     return 0;
 806 }
 807
 808
 809 /// Target fchmod() handler.
 810 template <class OS>
 811 SyscallReturn
 812 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 813            ThreadContext *tc)
 814 {
 815     int index = 0;
 816     int tgt_fd = process->getSyscallArg(tc, index);
 817     uint32_t mode = process->getSyscallArg(tc, index);
 818
 819     int sim_fd = process->getSimFD(tgt_fd);
 820     if (sim_fd < 0)
 821         return -EBADF;
 822
 823     mode_t hostMode = 0;
 824
 825     // XXX translate mode flags via OS::someting???
 826     hostMode = mode;
 827
 828     // do the fchmod
 829     int result = fchmod(sim_fd, hostMode);
 830     if (result < 0)
 831         return -errno;
 832
 833     return 0;
 834 }
 835
 836 /// Target mremap() handler.
 837 template <class OS>
 838 SyscallReturn
 839 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
 840 {
 841     int index = 0;
 842     Addr start = process->getSyscallArg(tc, index);
 843     uint64_t old_length = process->getSyscallArg(tc, index);
 844     uint64_t new_length = process->getSyscallArg(tc, index);
 845     uint64_t flags = process->getSyscallArg(tc, index);
 846     uint64_t provided_address = 0;
 847     bool use_provided_address = flags & OS::TGT_MREMAP_FIXED;
 848
 849     if (use_provided_address)
 850         provided_address = process->getSyscallArg(tc, index);
 851
 852     if ((start % TheISA::PageBytes != 0) ||
 853         (provided_address % TheISA::PageBytes != 0)) {
 854         warn("mremap failing: arguments not page aligned");
 855         return -EINVAL;
 856     }
 857
 858     new_length = roundUp(new_length, TheISA::PageBytes);
 859
 860     if (new_length > old_length) {
 861         if ((start + old_length) == process->mmap_end &&
 862             (!use_provided_address || provided_address == start)) {
 863             uint64_t diff = new_length - old_length;
 864             process->allocateMem(process->mmap_end, diff);
 865             process->mmap_end += diff;
 866             return start;
 867         } else {
 868             if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) {
 869                 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
 870                 return -ENOMEM;
 871             } else {
 872                 uint64_t new_start = use_provided_address ?
 873                     provided_address : process->mmap_end;
 874                 process->pTable->remap(start, old_length, new_start);
 875                 warn("mremapping to new vaddr %08p-%08p, adding %d\n",
 876                      new_start, new_start + new_length,
 877                      new_length - old_length);
 878                 // add on the remaining unallocated pages
 879                 process->allocateMem(new_start + old_length,
 880                                      new_length - old_length,
 881                                      use_provided_address /* clobber */);
 882                 if (!use_provided_address)
 883                     process->mmap_end += new_length;
 884                 if (use_provided_address &&
 885                     new_start + new_length > process->mmap_end) {
 886                     // something fishy going on here, at least notify the user
 887                     // @todo: increase mmap_end?
 888                     warn("mmap region limit exceeded with MREMAP_FIXED\n");
 889                 }
 890                 warn("returning %08p as start\n", new_start);
 891                 return new_start;
 892             }
 893         }
 894     } else {
 895         if (use_provided_address && provided_address != start)
 896             process->pTable->remap(start, new_length, provided_address);
 897         process->pTable->unmap(start + new_length, old_length - new_length);
 898         return use_provided_address ? provided_address : start;
 899     }
 900 }
 901
 902 /// Target stat() handler.
 903 template <class OS>
 904 SyscallReturn
 905 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 906          ThreadContext *tc)
 907 {
 908     std::string path;
 909
 910     int index = 0;
 911     if (!tc->getMemProxy().tryReadString(path,
 912                 process->getSyscallArg(tc, index))) {
 913         return -EFAULT;
 914     }
 915     Addr bufPtr = process->getSyscallArg(tc, index);
 916
 917     // Adjust path for current working directory
 918     path = process->fullPath(path);
 919
 920     struct stat hostBuf;
 921     int result = stat(path.c_str(), &hostBuf);
 922
 923     if (result < 0)
 924         return -errno;
 925
 926     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 927
 928     return 0;
 929 }
 930
 931
 932 /// Target stat64() handler.
 933 template <class OS>
 934 SyscallReturn
 935 stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 936            ThreadContext *tc)
 937 {
 938     std::string path;
 939
 940     int index = 0;
 941     if (!tc->getMemProxy().tryReadString(path,
 942                 process->getSyscallArg(tc, index)))
 943         return -EFAULT;
 944     Addr bufPtr = process->getSyscallArg(tc, index);
 945
 946     // Adjust path for current working directory
 947     path = process->fullPath(path);
 948
 949 #if NO_STAT64
 950     struct stat  hostBuf;
 951     int result = stat(path.c_str(), &hostBuf);
 952 #else
 953     struct stat64 hostBuf;
 954     int result = stat64(path.c_str(), &hostBuf);
 955 #endif
 956
 957     if (result < 0)
 958         return -errno;
 959
 960     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 961
 962     return 0;
 963 }
 964
 965
 966 /// Target fstatat64() handler.
 967 template <class OS>
 968 SyscallReturn
 969 fstatat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 970               ThreadContext *tc)
 971 {
 972     int index = 0;
 973     int dirfd = process->getSyscallArg(tc, index);
 974     if (dirfd != OS::TGT_AT_FDCWD)
 975         warn("fstatat64: first argument not AT_FDCWD; unlikely to work");
 976
 977     std::string path;
 978     if (!tc->getMemProxy().tryReadString(path,
 979                 process->getSyscallArg(tc, index)))
 980         return -EFAULT;
 981     Addr bufPtr = process->getSyscallArg(tc, index);
 982
 983     // Adjust path for current working directory
 984     path = process->fullPath(path);
 985
 986 #if NO_STAT64
 987     struct stat  hostBuf;
 988     int result = stat(path.c_str(), &hostBuf);
 989 #else
 990     struct stat64 hostBuf;
 991     int result = stat64(path.c_str(), &hostBuf);
 992 #endif
 993
 994     if (result < 0)
 995         return -errno;
 996
 997     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
 998
 999     return 0;
1000 }
1001
1002
1003 /// Target fstat64() handler.
1004 template <class OS>
1005 SyscallReturn
1006 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1007             ThreadContext *tc)
1008 {
1009     int index = 0;
1010     int tgt_fd = process->getSyscallArg(tc, index);
1011     Addr bufPtr = process->getSyscallArg(tc, index);
1012
1013     int sim_fd = process->getSimFD(tgt_fd);
1014     if (sim_fd < 0)
1015         return -EBADF;
1016
1017 #if NO_STAT64
1018     struct stat  hostBuf;
1019     int result = fstat(sim_fd, &hostBuf);
1020 #else
1021     struct stat64  hostBuf;
1022     int result = fstat64(sim_fd, &hostBuf);
1023 #endif
1024
1025     if (result < 0)
1026         return -errno;
1027
1028     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1029
1030     return 0;
1031 }
1032
1033
1034 /// Target lstat() handler.
1035 template <class OS>
1036 SyscallReturn
1037 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1038           ThreadContext *tc)
1039 {
1040     std::string path;
1041
1042     int index = 0;
1043     if (!tc->getMemProxy().tryReadString(path,
1044                 process->getSyscallArg(tc, index))) {
1045         return -EFAULT;
1046     }
1047     Addr bufPtr = process->getSyscallArg(tc, index);
1048
1049     // Adjust path for current working directory
1050     path = process->fullPath(path);
1051
1052     struct stat hostBuf;
1053     int result = lstat(path.c_str(), &hostBuf);
1054
1055     if (result < 0)
1056         return -errno;
1057
1058     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1059
1060     return 0;
1061 }
1062
1063 /// Target lstat64() handler.
1064 template <class OS>
1065 SyscallReturn
1066 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
1067             ThreadContext *tc)
1068 {
1069     std::string path;
1070
1071     int index = 0;
1072     if (!tc->getMemProxy().tryReadString(path,
1073                 process->getSyscallArg(tc, index))) {
1074         return -EFAULT;
1075     }
1076     Addr bufPtr = process->getSyscallArg(tc, index);
1077
1078     // Adjust path for current working directory
1079     path = process->fullPath(path);
1080
1081 #if NO_STAT64
1082     struct stat hostBuf;
1083     int result = lstat(path.c_str(), &hostBuf);
1084 #else
1085     struct stat64 hostBuf;
1086     int result = lstat64(path.c_str(), &hostBuf);
1087 #endif
1088
1089     if (result < 0)
1090         return -errno;
1091
1092     copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1093
1094     return 0;
1095 }
1096
1097 /// Target fstat() handler.
1098 template <class OS>
1099 SyscallReturn
1100 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1101           ThreadContext *tc)
1102 {
1103     int index = 0;
1104     int tgt_fd = process->getSyscallArg(tc, index);
1105     Addr bufPtr = process->getSyscallArg(tc, index);
1106
1107     DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd);
1108
1109     int sim_fd = process->getSimFD(tgt_fd);
1110     if (sim_fd < 0)
1111         return -EBADF;
1112
1113     struct stat hostBuf;
1114     int result = fstat(sim_fd, &hostBuf);
1115
1116     if (result < 0)
1117         return -errno;
1118
1119     copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1));
1120
1121     return 0;
1122 }
1123
1124
1125 /// Target statfs() handler.
1126 template <class OS>
1127 SyscallReturn
1128 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1129            ThreadContext *tc)
1130 {
1131 #if NO_STATFS
1132     warn("Host OS cannot support calls to statfs. Ignoring syscall");
1133 #else
1134     std::string path;
1135
1136     int index = 0;
1137     if (!tc->getMemProxy().tryReadString(path,
1138                 process->getSyscallArg(tc, index))) {
1139         return -EFAULT;
1140     }
1141     Addr bufPtr = process->getSyscallArg(tc, index);
1142
1143     // Adjust path for current working directory
1144     path = process->fullPath(path);
1145
1146     struct statfs hostBuf;
1147     int result = statfs(path.c_str(), &hostBuf);
1148
1149     if (result < 0)
1150         return -errno;
1151
1152     copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1153 #endif
1154     return 0;
1155 }
1156
1157
1158 /// Target fstatfs() handler.
1159 template <class OS>
1160 SyscallReturn
1161 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1162             ThreadContext *tc)
1163 {
1164     int index = 0;
1165     int tgt_fd = process->getSyscallArg(tc, index);
1166     Addr bufPtr = process->getSyscallArg(tc, index);
1167
1168     int sim_fd = process->getSimFD(tgt_fd);
1169     if (sim_fd < 0)
1170         return -EBADF;
1171
1172     struct statfs hostBuf;
1173     int result = fstatfs(sim_fd, &hostBuf);
1174
1175     if (result < 0)
1176         return -errno;
1177
1178     copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf);
1179
1180     return 0;
1181 }
1182
1183
1184 /// Target writev() handler.
1185 template <class OS>
1186 SyscallReturn
1187 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1188            ThreadContext *tc)
1189 {
1190     int index = 0;
1191     int tgt_fd = process->getSyscallArg(tc, index);
1192
1193     int sim_fd = process->getSimFD(tgt_fd);
1194     if (sim_fd < 0)
1195         return -EBADF;
1196
1197     SETranslatingPortProxy &p = tc->getMemProxy();
1198     uint64_t tiov_base = process->getSyscallArg(tc, index);
1199     size_t count = process->getSyscallArg(tc, index);
1200     struct iovec hiov[count];
1201     for (size_t i = 0; i < count; ++i) {
1202         typename OS::tgt_iovec tiov;
1203
1204         p.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
1205                    (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
1206         hiov[i].iov_len = TheISA::gtoh(tiov.iov_len);
1207         hiov[i].iov_base = new char [hiov[i].iov_len];
1208         p.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
1209                    hiov[i].iov_len);
1210     }
1211
1212     int result = writev(sim_fd, hiov, count);
1213
1214     for (size_t i = 0; i < count; ++i)
1215         delete [] (char *)hiov[i].iov_base;
1216
1217     if (result < 0)
1218         return -errno;
1219
1220     return result;
1221 }
1222
1223 /// Real mmap handler.
1224 template <class OS>
1225 SyscallReturn
1226 mmapImpl(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
1227          bool is_mmap2)
1228 {
1229     int index = 0;
1230     Addr start = p->getSyscallArg(tc, index);
1231     uint64_t length = p->getSyscallArg(tc, index);
1232     int prot = p->getSyscallArg(tc, index);
1233     int tgt_flags = p->getSyscallArg(tc, index);
1234     int tgt_fd = p->getSyscallArg(tc, index);
1235     int offset = p->getSyscallArg(tc, index);
1236
1237     if (is_mmap2)
1238         offset *= TheISA::PageBytes;
1239
1240     if (start & (TheISA::PageBytes - 1) ||
1241         offset & (TheISA::PageBytes - 1) ||
1242         (tgt_flags & OS::TGT_MAP_PRIVATE &&
1243          tgt_flags & OS::TGT_MAP_SHARED) ||
1244         (!(tgt_flags & OS::TGT_MAP_PRIVATE) &&
1245          !(tgt_flags & OS::TGT_MAP_SHARED)) ||
1246         !length) {
1247         return -EINVAL;
1248     }
1249
1250     if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) {
1251         // With shared mmaps, there are two cases to consider:
1252         // 1) anonymous: writes should modify the mapping and this should be
1253         // visible to observers who share the mapping. Currently, it's
1254         // difficult to update the shared mapping because there's no
1255         // structure which maintains information about the which virtual
1256         // memory areas are shared. If that structure existed, it would be
1257         // possible to make the translations point to the same frames.
1258         // 2) file-backed: writes should modify the mapping and the file
1259         // which is backed by the mapping. The shared mapping problem is the
1260         // same as what was mentioned about the anonymous mappings. For
1261         // file-backed mappings, the writes to the file are difficult
1262         // because it requires syncing what the mapping holds with the file
1263         // that resides on the host system. So, any write on a real system
1264         // would cause the change to be propagated to the file mapping at
1265         // some point in the future (the inode is tracked along with the
1266         // mapping). This isn't guaranteed to always happen, but it usually
1267         // works well enough. The guarantee is provided by the msync system
1268         // call. We could force the change through with shared mappings with
1269         // a call to msync, but that again would require more information
1270         // than we currently maintain.
1271         warn("mmap: writing to shared mmap region is currently "
1272              "unsupported. The write succeeds on the target, but it "
1273              "will not be propagated to the host or shared mappings");
1274     }
1275
1276     length = roundUp(length, TheISA::PageBytes);
1277
1278     int sim_fd = -1;
1279     uint8_t *pmap = nullptr;
1280     if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) {
1281         // Check for EmulatedDriver mmap
1282         FDEntry *fde = p->getFDEntry(tgt_fd);
1283         if (fde == NULL)
1284             return -EBADF;
1285
1286         if (fde->driver != NULL) {
1287             return fde->driver->mmap(p, tc, start, length, prot,
1288                                      tgt_flags, tgt_fd, offset);
1289         }
1290         sim_fd = fde->fd;
1291
1292         if (sim_fd < 0)
1293             return -EBADF;
1294
1295         pmap = (decltype(pmap))mmap(NULL, length, PROT_READ, MAP_PRIVATE,
1296                                     sim_fd, offset);
1297
1298         if (pmap == (decltype(pmap))-1) {
1299             warn("mmap: failed to map file into host address space");
1300             return -errno;
1301         }
1302     }
1303
1304     // Extend global mmap region if necessary. Note that we ignore the
1305     // start address unless MAP_FIXED is specified.
1306     if (!(tgt_flags & OS::TGT_MAP_FIXED)) {
1307         start = p->mmapGrowsDown() ? p->mmap_end - length : p->mmap_end;
1308         p->mmap_end = p->mmapGrowsDown() ? start : p->mmap_end + length;
1309     }
1310
1311     DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n",
1312                     start, start + length - 1);
1313
1314     // We only allow mappings to overwrite existing mappings if
1315     // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem
1316     // because we ignore the start hint if TGT_MAP_FIXED is not set.
1317     int clobber = tgt_flags & OS::TGT_MAP_FIXED;
1318     if (clobber) {
1319         for (auto tc : p->system->threadContexts) {
1320             // If we might be overwriting old mappings, we need to
1321             // invalidate potentially stale mappings out of the TLBs.
1322             tc->getDTBPtr()->flushAll();
1323             tc->getITBPtr()->flushAll();
1324         }
1325     }
1326
1327     // Allocate physical memory and map it in. If the page table is already
1328     // mapped and clobber is not set, the simulator will issue throw a
1329     // fatal and bail out of the simulation.
1330     p->allocateMem(start, length, clobber);
1331
1332     // Transfer content into target address space.
1333     SETranslatingPortProxy &tp = tc->getMemProxy();
1334     if (tgt_flags & OS::TGT_MAP_ANONYMOUS) {
1335         // In general, we should zero the mapped area for anonymous mappings,
1336         // with something like:
1337         //     tp.memsetBlob(start, 0, length);
1338         // However, given that we don't support sparse mappings, and
1339         // some applications can map a couple of gigabytes of space
1340         // (intending sparse usage), that can get painfully expensive.
1341         // Fortunately, since we don't properly implement munmap either,
1342         // there's no danger of remapping used memory, so for now all
1343         // newly mapped memory should already be zeroed so we can skip it.
1344     } else {
1345         // It is possible to mmap an area larger than a file, however
1346         // accessing unmapped portions the system triggers a "Bus error"
1347         // on the host. We must know when to stop copying the file from
1348         // the host into the target address space.
1349         struct stat file_stat;
1350         if (fstat(sim_fd, &file_stat) > 0)
1351             fatal("mmap: cannot stat file");
1352
1353         // Copy the portion of the file that is resident. This requires
1354         // checking both the mmap size and the filesize that we are
1355         // trying to mmap into this space; the mmap size also depends
1356         // on the specified offset into the file.
1357         uint64_t size = std::min((uint64_t)file_stat.st_size - offset,
1358                                  length);
1359         tp.writeBlob(start, pmap, size);
1360
1361         // Cleanup the mmap region before exiting this function.
1362         munmap(pmap, length);
1363
1364         // Maintain the symbol table for dynamic executables.
1365         // The loader will call mmap to map the images into its address
1366         // space and we intercept that here. We can verify that we are
1367         // executing inside the loader by checking the program counter value.
1368         // XXX: with multiprogrammed workloads or multi-node configurations,
1369         // this will not work since there is a single global symbol table.
1370         ObjectFile *interpreter = p->getInterpreter();
1371         if (interpreter) {
1372             Addr text_start = interpreter->textBase();
1373             Addr text_end = text_start + interpreter->textSize();
1374
1375             Addr pc = tc->pcState().pc();
1376
1377             if (pc >= text_start && pc < text_end) {
1378                 FDEntry *fde = p->getFDEntry(tgt_fd);
1379
1380                 ObjectFile *lib = createObjectFile(fde->filename);
1381
1382                 if (lib) {
1383                     lib->loadAllSymbols(debugSymbolTable,
1384                                         lib->textBase(), start);
1385                 }
1386             }
1387         }
1388
1389         // Note that we do not zero out the remainder of the mapping. This
1390         // is done by a real system, but it probably will not affect
1391         // execution (hopefully).
1392     }
1393
1394     return start;
1395 }
1396
1397 template <class OS>
1398 SyscallReturn
1399 pwrite64Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1400 {
1401     int index = 0;
1402     int tgt_fd = p->getSyscallArg(tc, index);
1403     Addr bufPtr = p->getSyscallArg(tc, index);
1404     int nbytes = p->getSyscallArg(tc, index);
1405     int offset = p->getSyscallArg(tc, index);
1406
1407     int sim_fd = p->getSimFD(tgt_fd);
1408     if (sim_fd < 0)
1409         return -EBADF;
1410
1411     BufferArg bufArg(bufPtr, nbytes);
1412     bufArg.copyIn(tc->getMemProxy());
1413
1414     int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset);
1415
1416     return (bytes_written == -1) ? -errno : bytes_written;
1417 }
1418
1419 /// Target mmap() handler.
1420 template <class OS>
1421 SyscallReturn
1422 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1423 {
1424     return mmapImpl<OS>(desc, num, p, tc, false);
1425 }
1426
1427 /// Target mmap2() handler.
1428 template <class OS>
1429 SyscallReturn
1430 mmap2Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1431 {
1432     return mmapImpl<OS>(desc, num, p, tc, true);
1433 }
1434
1435 /// Target getrlimit() handler.
1436 template <class OS>
1437 SyscallReturn
1438 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1439         ThreadContext *tc)
1440 {
1441     int index = 0;
1442     unsigned resource = process->getSyscallArg(tc, index);
1443     TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index));
1444
1445     switch (resource) {
1446         case OS::TGT_RLIMIT_STACK:
1447             // max stack size in bytes: make up a number (8MB for now)
1448             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1449             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1450             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1451             break;
1452
1453         case OS::TGT_RLIMIT_DATA:
1454             // max data segment size in bytes: make up a number
1455             rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1456             rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
1457             rlp->rlim_max = TheISA::htog(rlp->rlim_max);
1458             break;
1459
1460         default:
1461             warn("getrlimit: unimplemented resource %d", resource);
1462             return -EINVAL;
1463             break;
1464     }
1465
1466     rlp.copyOut(tc->getMemProxy());
1467     return 0;
1468 }
1469
1470 /// Target clock_gettime() function.
1471 template <class OS>
1472 SyscallReturn
1473 clock_gettimeFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1474 {
1475     int index = 1;
1476     //int clk_id = p->getSyscallArg(tc, index);
1477     TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1478
1479     getElapsedTimeNano(tp->tv_sec, tp->tv_nsec);
1480     tp->tv_sec += seconds_since_epoch;
1481     tp->tv_sec = TheISA::htog(tp->tv_sec);
1482     tp->tv_nsec = TheISA::htog(tp->tv_nsec);
1483
1484     tp.copyOut(tc->getMemProxy());
1485
1486     return 0;
1487 }
1488
1489 /// Target clock_getres() function.
1490 template <class OS>
1491 SyscallReturn
1492 clock_getresFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
1493 {
1494     int index = 1;
1495     TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index));
1496
1497     // Set resolution at ns, which is what clock_gettime() returns
1498     tp->tv_sec = 0;
1499     tp->tv_nsec = 1;
1500
1501     tp.copyOut(tc->getMemProxy());
1502
1503     return 0;
1504 }
1505
1506 /// Target gettimeofday() handler.
1507 template <class OS>
1508 SyscallReturn
1509 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1510         ThreadContext *tc)
1511 {
1512     int index = 0;
1513     TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index));
1514
1515     getElapsedTimeMicro(tp->tv_sec, tp->tv_usec);
1516     tp->tv_sec += seconds_since_epoch;
1517     tp->tv_sec = TheISA::htog(tp->tv_sec);
1518     tp->tv_usec = TheISA::htog(tp->tv_usec);
1519
1520     tp.copyOut(tc->getMemProxy());
1521
1522     return 0;
1523 }
1524
1525
1526 /// Target utimes() handler.
1527 template <class OS>
1528 SyscallReturn
1529 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1530            ThreadContext *tc)
1531 {
1532     std::string path;
1533
1534     int index = 0;
1535     if (!tc->getMemProxy().tryReadString(path,
1536                 process->getSyscallArg(tc, index))) {
1537         return -EFAULT;
1538     }
1539
1540     TypedBufferArg<typename OS::timeval [2]>
1541         tp(process->getSyscallArg(tc, index));
1542     tp.copyIn(tc->getMemProxy());
1543
1544     struct timeval hostTimeval[2];
1545     for (int i = 0; i < 2; ++i)
1546     {
1547         hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec);
1548         hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec);
1549     }
1550
1551     // Adjust path for current working directory
1552     path = process->fullPath(path);
1553
1554     int result = utimes(path.c_str(), hostTimeval);
1555
1556     if (result < 0)
1557         return -errno;
1558
1559     return 0;
1560 }
1561 /// Target getrusage() function.
1562 template <class OS>
1563 SyscallReturn
1564 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1565               ThreadContext *tc)
1566 {
1567     int index = 0;
1568     int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN
1569     TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index));
1570
1571     rup->ru_utime.tv_sec = 0;
1572     rup->ru_utime.tv_usec = 0;
1573     rup->ru_stime.tv_sec = 0;
1574     rup->ru_stime.tv_usec = 0;
1575     rup->ru_maxrss = 0;
1576     rup->ru_ixrss = 0;
1577     rup->ru_idrss = 0;
1578     rup->ru_isrss = 0;
1579     rup->ru_minflt = 0;
1580     rup->ru_majflt = 0;
1581     rup->ru_nswap = 0;
1582     rup->ru_inblock = 0;
1583     rup->ru_oublock = 0;
1584     rup->ru_msgsnd = 0;
1585     rup->ru_msgrcv = 0;
1586     rup->ru_nsignals = 0;
1587     rup->ru_nvcsw = 0;
1588     rup->ru_nivcsw = 0;
1589
1590     switch (who) {
1591       case OS::TGT_RUSAGE_SELF:
1592         getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1593         rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec);
1594         rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec);
1595         break;
1596
1597       case OS::TGT_RUSAGE_CHILDREN:
1598         // do nothing.  We have no child processes, so they take no time.
1599         break;
1600
1601       default:
1602         // don't really handle THREAD or CHILDREN, but just warn and
1603         // plow ahead
1604         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1605              who);
1606     }
1607
1608     rup.copyOut(tc->getMemProxy());
1609
1610     return 0;
1611 }
1612
1613 /// Target times() function.
1614 template <class OS>
1615 SyscallReturn
1616 timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1617            ThreadContext *tc)
1618 {
1619     int index = 0;
1620     TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index));
1621
1622     // Fill in the time structure (in clocks)
1623     int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s;
1624     bufp->tms_utime = clocks;
1625     bufp->tms_stime = 0;
1626     bufp->tms_cutime = 0;
1627     bufp->tms_cstime = 0;
1628
1629     // Convert to host endianness
1630     bufp->tms_utime = TheISA::htog(bufp->tms_utime);
1631
1632     // Write back
1633     bufp.copyOut(tc->getMemProxy());
1634
1635     // Return clock ticks since system boot
1636     return clocks;
1637 }
1638
1639 /// Target time() function.
1640 template <class OS>
1641 SyscallReturn
1642 timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1643            ThreadContext *tc)
1644 {
1645     typename OS::time_t sec, usec;
1646     getElapsedTimeMicro(sec, usec);
1647     sec += seconds_since_epoch;
1648
1649     int index = 0;
1650     Addr taddr = (Addr)process->getSyscallArg(tc, index);
1651     if (taddr != 0) {
1652         typename OS::time_t t = sec;
1653         t = TheISA::htog(t);
1654         SETranslatingPortProxy &p = tc->getMemProxy();
1655         p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t));
1656     }
1657     return sec;
1658 }
1659
1660
1661 #endif // __SIM_SYSCALL_EMUL_HH__