src/sim/syscall_emul.hh

   1 /*
   2  * Copyright (c) 2003-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Steve Reinhardt
  29  *          Kevin Lim
  30  */
  31
  32 #ifndef __SIM_SYSCALL_EMUL_HH__
  33 #define __SIM_SYSCALL_EMUL_HH__
  34
  35 #define NO_STAT64 (defined(__APPLE__) || defined(__OpenBSD__) || \
  36                    defined(__FreeBSD__) || defined(__CYGWIN__))
  37
  38 ///
  39 /// @file syscall_emul.hh
  40 ///
  41 /// This file defines objects used to emulate syscalls from the target
  42 /// application on the host machine.
  43
  44 #include <errno.h>
  45 #include <string>
  46 #ifdef __CYGWIN32__
  47 #include <sys/fcntl.h>  // for O_BINARY
  48 #endif
  49 #include <sys/stat.h>
  50 #include <fcntl.h>
  51 #include <sys/uio.h>
  52
  53 #include "sim/host.hh"  // for Addr
  54 #include "base/chunk_generator.hh"
  55 #include "base/intmath.hh"      // for RoundUp
  56 #include "base/misc.hh"
  57 #include "base/trace.hh"
  58 #include "cpu/base.hh"
  59 #include "cpu/thread_context.hh"
  60 #include "mem/translating_port.hh"
  61 #include "mem/page_table.hh"
  62 #include "sim/process.hh"
  63
  64 ///
  65 /// System call descriptor.
  66 ///
  67 class SyscallDesc {
  68
  69   public:
  70
  71     /// Typedef for target syscall handler functions.
  72     typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
  73                            LiveProcess *, ThreadContext *);
  74
  75     const char *name;   //!< Syscall name (e.g., "open").
  76     FuncPtr funcPtr;    //!< Pointer to emulation function.
  77     int flags;          //!< Flags (see Flags enum).
  78
  79     /// Flag values for controlling syscall behavior.
  80     enum Flags {
  81         /// Don't set return regs according to funcPtr return value.
  82         /// Used for syscalls with non-standard return conventions
  83         /// that explicitly set the ThreadContext regs (e.g.,
  84         /// sigreturn).
  85         SuppressReturnValue = 1
  86     };
  87
  88     /// Constructor.
  89     SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
  90         : name(_name), funcPtr(_funcPtr), flags(_flags)
  91     {
  92     }
  93
  94     /// Emulate the syscall.  Public interface for calling through funcPtr.
  95     void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
  96 };
  97
  98
  99 class BaseBufferArg {
 100
 101   public:
 102
 103     BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
 104     {
 105         bufPtr = new uint8_t[size];
 106         // clear out buffer: in case we only partially populate this,
 107         // and then do a copyOut(), we want to make sure we don't
 108         // introduce any random junk into the simulated address space
 109         memset(bufPtr, 0, size);
 110     }
 111
 112     virtual ~BaseBufferArg() { delete [] bufPtr; }
 113
 114     //
 115     // copy data into simulator space (read from target memory)
 116     //
 117     virtual bool copyIn(TranslatingPort *memport)
 118     {
 119         memport->readBlob(addr, bufPtr, size);
 120         return true;    // no EFAULT detection for now
 121     }
 122
 123     //
 124     // copy data out of simulator space (write to target memory)
 125     //
 126     virtual bool copyOut(TranslatingPort *memport)
 127     {
 128         memport->writeBlob(addr, bufPtr, size);
 129         return true;    // no EFAULT detection for now
 130     }
 131
 132   protected:
 133     Addr addr;
 134     int size;
 135     uint8_t *bufPtr;
 136 };
 137
 138
 139 class BufferArg : public BaseBufferArg
 140 {
 141   public:
 142     BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
 143     void *bufferPtr()   { return bufPtr; }
 144 };
 145
 146 template <class T>
 147 class TypedBufferArg : public BaseBufferArg
 148 {
 149   public:
 150     // user can optionally specify a specific number of bytes to
 151     // allocate to deal with those structs that have variable-size
 152     // arrays at the end
 153     TypedBufferArg(Addr _addr, int _size = sizeof(T))
 154         : BaseBufferArg(_addr, _size)
 155     { }
 156
 157     // type case
 158     operator T*() { return (T *)bufPtr; }
 159
 160     // dereference operators
 161     T &operator*()       { return *((T *)bufPtr); }
 162     T* operator->()      { return (T *)bufPtr; }
 163     T &operator[](int i) { return ((T *)bufPtr)[i]; }
 164 };
 165
 166 //////////////////////////////////////////////////////////////////////
 167 //
 168 // The following emulation functions are generic enough that they
 169 // don't need to be recompiled for different emulated OS's.  They are
 170 // defined in sim/syscall_emul.cc.
 171 //
 172 //////////////////////////////////////////////////////////////////////
 173
 174
 175 /// Handler for unimplemented syscalls that we haven't thought about.
 176 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 177                                 LiveProcess *p, ThreadContext *tc);
 178
 179 /// Handler for unimplemented syscalls that we never intend to
 180 /// implement (signal handling, etc.) and should not affect the correct
 181 /// behavior of the program.  Print a warning only if the appropriate
 182 /// trace flag is enabled.  Return success to the target program.
 183 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 184                          LiveProcess *p, ThreadContext *tc);
 185
 186 /// Target exit() handler: terminate simulation.
 187 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 188                        LiveProcess *p, ThreadContext *tc);
 189
 190 /// Target getpagesize() handler.
 191 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 192                               LiveProcess *p, ThreadContext *tc);
 193
 194 /// Target obreak() handler: set brk address.
 195 SyscallReturn obreakFunc(SyscallDesc *desc, int num,
 196                          LiveProcess *p, ThreadContext *tc);
 197
 198 /// Target close() handler.
 199 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 200                         LiveProcess *p, ThreadContext *tc);
 201
 202 /// Target read() handler.
 203 SyscallReturn readFunc(SyscallDesc *desc, int num,
 204                        LiveProcess *p, ThreadContext *tc);
 205
 206 /// Target write() handler.
 207 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 208                         LiveProcess *p, ThreadContext *tc);
 209
 210 /// Target lseek() handler.
 211 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 212                         LiveProcess *p, ThreadContext *tc);
 213
 214 /// Target _llseek() handler.
 215 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
 216                         LiveProcess *p, ThreadContext *tc);
 217
 218 /// Target munmap() handler.
 219 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 220                          LiveProcess *p, ThreadContext *tc);
 221
 222 /// Target gethostname() handler.
 223 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 224                               LiveProcess *p, ThreadContext *tc);
 225
 226 /// Target unlink() handler.
 227 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 228                          LiveProcess *p, ThreadContext *tc);
 229
 230 /// Target rename() handler.
 231 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 232                          LiveProcess *p, ThreadContext *tc);
 233
 234
 235 /// Target truncate() handler.
 236 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 237                            LiveProcess *p, ThreadContext *tc);
 238
 239
 240 /// Target ftruncate() handler.
 241 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 242                             LiveProcess *p, ThreadContext *tc);
 243
 244
 245 /// Target chown() handler.
 246 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 247                         LiveProcess *p, ThreadContext *tc);
 248
 249
 250 /// Target fchown() handler.
 251 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 252                          LiveProcess *p, ThreadContext *tc);
 253
 254 /// Target dup() handler.
 255 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 256                       LiveProcess *process, ThreadContext *tc);
 257
 258 /// Target fnctl() handler.
 259 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 260                         LiveProcess *process, ThreadContext *tc);
 261
 262 /// Target fcntl64() handler.
 263 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 264                         LiveProcess *process, ThreadContext *tc);
 265
 266 /// Target setuid() handler.
 267 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 268                                LiveProcess *p, ThreadContext *tc);
 269
 270 /// Target getpid() handler.
 271 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 272                                LiveProcess *p, ThreadContext *tc);
 273
 274 /// Target getuid() handler.
 275 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 276                                LiveProcess *p, ThreadContext *tc);
 277
 278 /// Target getgid() handler.
 279 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 280                                LiveProcess *p, ThreadContext *tc);
 281
 282 /// Target getppid() handler.
 283 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 284                                LiveProcess *p, ThreadContext *tc);
 285
 286 /// Target geteuid() handler.
 287 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 288                                LiveProcess *p, ThreadContext *tc);
 289
 290 /// Target getegid() handler.
 291 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 292                                LiveProcess *p, ThreadContext *tc);
 293
 294
 295
 296 /// Pseudo Funcs  - These functions use a different return convension,
 297 /// returning a second value in a register other than the normal return register
 298 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 299                              LiveProcess *process, ThreadContext *tc);
 300
 301 /// Target getpidPseudo() handler.
 302 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 303                                LiveProcess *p, ThreadContext *tc);
 304
 305 /// Target getuidPseudo() handler.
 306 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 307                                LiveProcess *p, ThreadContext *tc);
 308
 309 /// Target getgidPseudo() handler.
 310 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 311                                LiveProcess *p, ThreadContext *tc);
 312
 313
 314 /// A readable name for 1,000,000, for converting microseconds to seconds.
 315 const int one_million = 1000000;
 316
 317 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 318 /// by my reckoning.  We want to keep this a constant (not use the
 319 /// real-world time) to keep simulations repeatable.
 320 const unsigned seconds_since_epoch = 1000000000;
 321
 322 /// Helper function to convert current elapsed time to seconds and
 323 /// microseconds.
 324 template <class T1, class T2>
 325 void
 326 getElapsedTime(T1 &sec, T2 &usec)
 327 {
 328     int elapsed_usecs = curTick / Clock::Int::us;
 329     sec = elapsed_usecs / one_million;
 330     usec = elapsed_usecs % one_million;
 331 }
 332
 333 //////////////////////////////////////////////////////////////////////
 334 //
 335 // The following emulation functions are generic, but need to be
 336 // templated to account for differences in types, constants, etc.
 337 //
 338 //////////////////////////////////////////////////////////////////////
 339
 340 #if NO_STAT64
 341     typedef struct stat hst_stat;
 342     typedef struct stat hst_stat64;
 343 #else
 344     typedef struct stat hst_stat;
 345     typedef struct stat64 hst_stat64;
 346 #endif
 347
 348 //// Helper function to convert a host stat buffer to a target stat
 349 //// buffer.  Also copies the target buffer out to the simulated
 350 //// memory space.  Used by stat(), fstat(), and lstat().
 351
 352 template <typename target_stat, typename host_stat>
 353 static void
 354 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 355 {
 356     if (fakeTTY)
 357         tgt->st_dev = 0xA;
 358     else
 359         tgt->st_dev = host->st_dev;
 360     tgt->st_dev = htog(tgt->st_dev);
 361     tgt->st_ino = host->st_ino;
 362     tgt->st_ino = htog(tgt->st_ino);
 363     tgt->st_mode = host->st_mode;
 364     tgt->st_mode = htog(tgt->st_mode);
 365     tgt->st_nlink = host->st_nlink;
 366     tgt->st_nlink = htog(tgt->st_nlink);
 367     tgt->st_uid = host->st_uid;
 368     tgt->st_uid = htog(tgt->st_uid);
 369     tgt->st_gid = host->st_gid;
 370     tgt->st_gid = htog(tgt->st_gid);
 371     if (fakeTTY)
 372         tgt->st_rdev = 0x880d;
 373     else
 374         tgt->st_rdev = host->st_rdev;
 375     tgt->st_rdev = htog(tgt->st_rdev);
 376     tgt->st_size = host->st_size;
 377     tgt->st_size = htog(tgt->st_size);
 378     tgt->st_atimeX = host->st_atime;
 379     tgt->st_atimeX = htog(tgt->st_atimeX);
 380     tgt->st_mtimeX = host->st_mtime;
 381     tgt->st_mtimeX = htog(tgt->st_mtimeX);
 382     tgt->st_ctimeX = host->st_ctime;
 383     tgt->st_ctimeX = htog(tgt->st_ctimeX);
 384     // Force the block size to be 8k. This helps to ensure buffered io works
 385     // consistently across different hosts.
 386     tgt->st_blksize = 0x2000;
 387     tgt->st_blksize = htog(tgt->st_blksize);
 388     tgt->st_blocks = host->st_blocks;
 389     tgt->st_blocks = htog(tgt->st_blocks);
 390 }
 391
 392 // Same for stat64
 393
 394 template <typename target_stat, typename host_stat64>
 395 static void
 396 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 397 {
 398     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 399 #if defined(STAT_HAVE_NSEC)
 400     tgt->st_atime_nsec = host->st_atime_nsec;
 401     tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
 402     tgt->st_mtime_nsec = host->st_mtime_nsec;
 403     tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
 404     tgt->st_ctime_nsec = host->st_ctime_nsec;
 405     tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
 406 #else
 407     tgt->st_atime_nsec = 0;
 408     tgt->st_mtime_nsec = 0;
 409     tgt->st_ctime_nsec = 0;
 410 #endif
 411 }
 412
 413 //Here are a couple convenience functions
 414 template<class OS>
 415 static void
 416 copyOutStatBuf(TranslatingPort * mem, Addr addr,
 417         hst_stat *host, bool fakeTTY = false)
 418 {
 419     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 420     tgt_stat_buf tgt(addr);
 421     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 422     tgt.copyOut(mem);
 423 }
 424
 425 template<class OS>
 426 static void
 427 copyOutStat64Buf(TranslatingPort * mem, Addr addr,
 428         hst_stat64 *host, bool fakeTTY = false)
 429 {
 430     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 431     tgt_stat_buf tgt(addr);
 432     convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 433     tgt.copyOut(mem);
 434 }
 435
 436 /// Target ioctl() handler.  For the most part, programs call ioctl()
 437 /// only to find out if their stdout is a tty, to determine whether to
 438 /// do line or block buffering.
 439 template <class OS>
 440 SyscallReturn
 441 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 442           ThreadContext *tc)
 443 {
 444     int fd = tc->getSyscallArg(0);
 445     unsigned req = tc->getSyscallArg(1);
 446
 447     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 448
 449     if (fd < 0 || process->sim_fd(fd) < 0) {
 450         // doesn't map to any simulator fd: not a valid target fd
 451         return -EBADF;
 452     }
 453
 454     switch (req) {
 455       case OS::TIOCISATTY_:
 456       case OS::TIOCGETP_:
 457       case OS::TIOCSETP_:
 458       case OS::TIOCSETN_:
 459       case OS::TIOCSETC_:
 460       case OS::TIOCGETC_:
 461       case OS::TIOCGETS_:
 462       case OS::TIOCGETA_:
 463         return -ENOTTY;
 464
 465       default:
 466         fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
 467               fd, req, tc->readPC());
 468     }
 469 }
 470
 471 /// Target open() handler.
 472 template <class OS>
 473 SyscallReturn
 474 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 475          ThreadContext *tc)
 476 {
 477     std::string path;
 478
 479     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 480         return -EFAULT;
 481
 482     if (path == "/dev/sysdev0") {
 483         // This is a memory-mapped high-resolution timer device on Alpha.
 484         // We don't support it, so just punt.
 485         warn("Ignoring open(%s, ...)\n", path);
 486         return -ENOENT;
 487     }
 488
 489     int tgtFlags = tc->getSyscallArg(1);
 490     int mode = tc->getSyscallArg(2);
 491     int hostFlags = 0;
 492
 493     // translate open flags
 494     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 495         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 496             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 497             hostFlags |= OS::openFlagTable[i].hostFlag;
 498         }
 499     }
 500
 501     // any target flags left?
 502     if (tgtFlags != 0)
 503         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 504
 505 #ifdef __CYGWIN32__
 506     hostFlags |= O_BINARY;
 507 #endif
 508
 509     // Adjust path for current working directory
 510     path = process->fullPath(path);
 511
 512     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 513
 514     // open the file
 515     int fd = open(path.c_str(), hostFlags, mode);
 516
 517     return (fd == -1) ? -errno : process->alloc_fd(fd);
 518 }
 519
 520
 521 /// Target chmod() handler.
 522 template <class OS>
 523 SyscallReturn
 524 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 525           ThreadContext *tc)
 526 {
 527     std::string path;
 528
 529     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 530         return -EFAULT;
 531
 532     uint32_t mode = tc->getSyscallArg(1);
 533     mode_t hostMode = 0;
 534
 535     // XXX translate mode flags via OS::something???
 536     hostMode = mode;
 537
 538     // Adjust path for current working directory
 539     path = process->fullPath(path);
 540
 541     // do the chmod
 542     int result = chmod(path.c_str(), hostMode);
 543     if (result < 0)
 544         return -errno;
 545
 546     return 0;
 547 }
 548
 549
 550 /// Target fchmod() handler.
 551 template <class OS>
 552 SyscallReturn
 553 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 554            ThreadContext *tc)
 555 {
 556     int fd = tc->getSyscallArg(0);
 557     if (fd < 0 || process->sim_fd(fd) < 0) {
 558         // doesn't map to any simulator fd: not a valid target fd
 559         return -EBADF;
 560     }
 561
 562     uint32_t mode = tc->getSyscallArg(1);
 563     mode_t hostMode = 0;
 564
 565     // XXX translate mode flags via OS::someting???
 566     hostMode = mode;
 567
 568     // do the fchmod
 569     int result = fchmod(process->sim_fd(fd), hostMode);
 570     if (result < 0)
 571         return -errno;
 572
 573     return 0;
 574 }
 575
 576
 577 /// Target stat() handler.
 578 template <class OS>
 579 SyscallReturn
 580 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 581          ThreadContext *tc)
 582 {
 583     std::string path;
 584
 585     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 586     return -EFAULT;
 587
 588     // Adjust path for current working directory
 589     path = process->fullPath(path);
 590
 591     struct stat hostBuf;
 592     int result = stat(path.c_str(), &hostBuf);
 593
 594     if (result < 0)
 595         return -errno;
 596
 597     copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
 598
 599     return 0;
 600 }
 601
 602
 603 /// Target fstat64() handler.
 604 template <class OS>
 605 SyscallReturn
 606 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 607             ThreadContext *tc)
 608 {
 609     int fd = tc->getSyscallArg(0);
 610     if (fd < 0 || process->sim_fd(fd) < 0) {
 611         // doesn't map to any simulator fd: not a valid target fd
 612         return -EBADF;
 613     }
 614
 615 #if NO_STAT64
 616     struct stat  hostBuf;
 617     int result = fstat(process->sim_fd(fd), &hostBuf);
 618 #else
 619     struct stat64  hostBuf;
 620     int result = fstat64(process->sim_fd(fd), &hostBuf);
 621 #endif
 622
 623     if (result < 0)
 624         return -errno;
 625
 626     copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
 627         &hostBuf, (fd == 1));
 628
 629     return 0;
 630 }
 631
 632
 633 /// Target lstat() handler.
 634 template <class OS>
 635 SyscallReturn
 636 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 637           ThreadContext *tc)
 638 {
 639     std::string path;
 640
 641     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 642       return -EFAULT;
 643
 644     // Adjust path for current working directory
 645     path = process->fullPath(path);
 646
 647     struct stat hostBuf;
 648     int result = lstat(path.c_str(), &hostBuf);
 649
 650     if (result < 0)
 651         return -errno;
 652
 653     copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
 654
 655     return 0;
 656 }
 657
 658 /// Target lstat64() handler.
 659 template <class OS>
 660 SyscallReturn
 661 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 662             ThreadContext *tc)
 663 {
 664     std::string path;
 665
 666     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 667       return -EFAULT;
 668
 669     // Adjust path for current working directory
 670     path = process->fullPath(path);
 671
 672 #if NO_STAT64
 673     struct stat hostBuf;
 674     int result = lstat(path.c_str(), &hostBuf);
 675 #else
 676     struct stat64 hostBuf;
 677     int result = lstat64(path.c_str(), &hostBuf);
 678 #endif
 679
 680     if (result < 0)
 681         return -errno;
 682
 683     copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
 684
 685     return 0;
 686 }
 687
 688 /// Target fstat() handler.
 689 template <class OS>
 690 SyscallReturn
 691 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 692           ThreadContext *tc)
 693 {
 694     int fd = process->sim_fd(tc->getSyscallArg(0));
 695
 696     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
 697
 698     if (fd < 0)
 699         return -EBADF;
 700
 701     struct stat hostBuf;
 702     int result = fstat(fd, &hostBuf);
 703
 704     if (result < 0)
 705         return -errno;
 706
 707     copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
 708         &hostBuf, (fd == 1));
 709
 710     return 0;
 711 }
 712
 713
 714 /// Target statfs() handler.
 715 template <class OS>
 716 SyscallReturn
 717 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 718            ThreadContext *tc)
 719 {
 720     std::string path;
 721
 722     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 723       return -EFAULT;
 724
 725     // Adjust path for current working directory
 726     path = process->fullPath(path);
 727
 728     struct statfs hostBuf;
 729     int result = statfs(path.c_str(), &hostBuf);
 730
 731     if (result < 0)
 732         return -errno;
 733
 734     OS::copyOutStatfsBuf(tc->getMemPort(),
 735             (Addr)(tc->getSyscallArg(1)), &hostBuf);
 736
 737     return 0;
 738 }
 739
 740
 741 /// Target fstatfs() handler.
 742 template <class OS>
 743 SyscallReturn
 744 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 745             ThreadContext *tc)
 746 {
 747     int fd = process->sim_fd(tc->getSyscallArg(0));
 748
 749     if (fd < 0)
 750         return -EBADF;
 751
 752     struct statfs hostBuf;
 753     int result = fstatfs(fd, &hostBuf);
 754
 755     if (result < 0)
 756         return -errno;
 757
 758     OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
 759         &hostBuf);
 760
 761     return 0;
 762 }
 763
 764
 765 /// Target writev() handler.
 766 template <class OS>
 767 SyscallReturn
 768 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 769            ThreadContext *tc)
 770 {
 771     int fd = tc->getSyscallArg(0);
 772     if (fd < 0 || process->sim_fd(fd) < 0) {
 773         // doesn't map to any simulator fd: not a valid target fd
 774         return -EBADF;
 775     }
 776
 777     TranslatingPort *p = tc->getMemPort();
 778     uint64_t tiov_base = tc->getSyscallArg(1);
 779     size_t count = tc->getSyscallArg(2);
 780     struct iovec hiov[count];
 781     for (int i = 0; i < count; ++i)
 782     {
 783         typename OS::tgt_iovec tiov;
 784
 785         p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
 786                     (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
 787         hiov[i].iov_len = gtoh(tiov.iov_len);
 788         hiov[i].iov_base = new char [hiov[i].iov_len];
 789         p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
 790                     hiov[i].iov_len);
 791     }
 792
 793     int result = writev(process->sim_fd(fd), hiov, count);
 794
 795     for (int i = 0; i < count; ++i)
 796     {
 797         delete [] (char *)hiov[i].iov_base;
 798     }
 799
 800     if (result < 0)
 801         return -errno;
 802
 803     return 0;
 804 }
 805
 806
 807 /// Target mmap() handler.
 808 ///
 809 /// We don't really handle mmap().  If the target is mmaping an
 810 /// anonymous region or /dev/zero, we can get away with doing basically
 811 /// nothing (since memory is initialized to zero and the simulator
 812 /// doesn't really check addresses anyway).  Always print a warning,
 813 /// since this could be seriously broken if we're not mapping
 814 /// /dev/zero.
 815 //
 816 /// Someday we should explicitly check for /dev/zero in open, flag the
 817 /// file descriptor, and fail (or implement!) a non-anonymous mmap to
 818 /// anything else.
 819 template <class OS>
 820 SyscallReturn
 821 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
 822 {
 823     Addr start = tc->getSyscallArg(0);
 824     uint64_t length = tc->getSyscallArg(1);
 825     // int prot = tc->getSyscallArg(2);
 826     int flags = tc->getSyscallArg(3);
 827     // int fd = p->sim_fd(tc->getSyscallArg(4));
 828     // int offset = tc->getSyscallArg(5);
 829
 830     if ((start  % TheISA::VMPageSize) != 0 ||
 831         (length % TheISA::VMPageSize) != 0) {
 832         warn("mmap failing: arguments not page-aligned: "
 833              "start 0x%x length 0x%x",
 834              start, length);
 835         return -EINVAL;
 836     }
 837
 838     if (start != 0) {
 839         warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
 840              start, p->mmap_end);
 841     }
 842
 843     // pick next address from our "mmap region"
 844     start = p->mmap_end;
 845     p->pTable->allocate(start, length);
 846     p->mmap_end += length;
 847
 848     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
 849         warn("allowing mmap of file @ fd %d. "
 850              "This will break if not /dev/zero.", tc->getSyscallArg(4));
 851     }
 852
 853     return start;
 854 }
 855
 856 /// Target getrlimit() handler.
 857 template <class OS>
 858 SyscallReturn
 859 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 860         ThreadContext *tc)
 861 {
 862     unsigned resource = tc->getSyscallArg(0);
 863     TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
 864
 865     switch (resource) {
 866         case OS::TGT_RLIMIT_STACK:
 867             // max stack size in bytes: make up a number (2MB for now)
 868             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
 869             rlp->rlim_cur = htog(rlp->rlim_cur);
 870             rlp->rlim_max = htog(rlp->rlim_max);
 871             break;
 872
 873         default:
 874             std::cerr << "getrlimitFunc: unimplemented resource " << resource
 875                 << std::endl;
 876             abort();
 877             break;
 878     }
 879
 880     rlp.copyOut(tc->getMemPort());
 881     return 0;
 882 }
 883
 884 /// Target gettimeofday() handler.
 885 template <class OS>
 886 SyscallReturn
 887 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 888         ThreadContext *tc)
 889 {
 890     TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
 891
 892     getElapsedTime(tp->tv_sec, tp->tv_usec);
 893     tp->tv_sec += seconds_since_epoch;
 894     tp->tv_sec = htog(tp->tv_sec);
 895     tp->tv_usec = htog(tp->tv_usec);
 896
 897     tp.copyOut(tc->getMemPort());
 898
 899     return 0;
 900 }
 901
 902
 903 /// Target utimes() handler.
 904 template <class OS>
 905 SyscallReturn
 906 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 907            ThreadContext *tc)
 908 {
 909     std::string path;
 910
 911     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 912       return -EFAULT;
 913
 914     TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
 915     tp.copyIn(tc->getMemPort());
 916
 917     struct timeval hostTimeval[2];
 918     for (int i = 0; i < 2; ++i)
 919     {
 920         hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
 921         hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
 922     }
 923
 924     // Adjust path for current working directory
 925     path = process->fullPath(path);
 926
 927     int result = utimes(path.c_str(), hostTimeval);
 928
 929     if (result < 0)
 930         return -errno;
 931
 932     return 0;
 933 }
 934 /// Target getrusage() function.
 935 template <class OS>
 936 SyscallReturn
 937 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 938               ThreadContext *tc)
 939 {
 940     int who = tc->getSyscallArg(0);     // THREAD, SELF, or CHILDREN
 941     TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
 942
 943     rup->ru_utime.tv_sec = 0;
 944     rup->ru_utime.tv_usec = 0;
 945     rup->ru_stime.tv_sec = 0;
 946     rup->ru_stime.tv_usec = 0;
 947     rup->ru_maxrss = 0;
 948     rup->ru_ixrss = 0;
 949     rup->ru_idrss = 0;
 950     rup->ru_isrss = 0;
 951     rup->ru_minflt = 0;
 952     rup->ru_majflt = 0;
 953     rup->ru_nswap = 0;
 954     rup->ru_inblock = 0;
 955     rup->ru_oublock = 0;
 956     rup->ru_msgsnd = 0;
 957     rup->ru_msgrcv = 0;
 958     rup->ru_nsignals = 0;
 959     rup->ru_nvcsw = 0;
 960     rup->ru_nivcsw = 0;
 961
 962     switch (who) {
 963       case OS::TGT_RUSAGE_SELF:
 964         getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
 965         rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
 966         rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
 967         break;
 968
 969       case OS::TGT_RUSAGE_CHILDREN:
 970         // do nothing.  We have no child processes, so they take no time.
 971         break;
 972
 973       default:
 974         // don't really handle THREAD or CHILDREN, but just warn and
 975         // plow ahead
 976         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
 977              who);
 978     }
 979
 980     rup.copyOut(tc->getMemPort());
 981
 982     return 0;
 983 }
 984
 985
 986
 987
 988 #endif // __SIM_SYSCALL_EMUL_HH__