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 munmap() handler.
 215 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 216                          LiveProcess *p, ThreadContext *tc);
 217
 218 /// Target gethostname() handler.
 219 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 220                               LiveProcess *p, ThreadContext *tc);
 221
 222 /// Target unlink() handler.
 223 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 224                          LiveProcess *p, ThreadContext *tc);
 225
 226 /// Target rename() handler.
 227 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 228                          LiveProcess *p, ThreadContext *tc);
 229
 230
 231 /// Target truncate() handler.
 232 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 233                            LiveProcess *p, ThreadContext *tc);
 234
 235
 236 /// Target ftruncate() handler.
 237 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 238                             LiveProcess *p, ThreadContext *tc);
 239
 240
 241 /// Target chown() handler.
 242 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 243                         LiveProcess *p, ThreadContext *tc);
 244
 245
 246 /// Target fchown() handler.
 247 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 248                          LiveProcess *p, ThreadContext *tc);
 249
 250 /// Target dup() handler.
 251 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 252                       LiveProcess *process, ThreadContext *tc);
 253
 254 /// Target fnctl() handler.
 255 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 256                         LiveProcess *process, ThreadContext *tc);
 257
 258 /// Target fcntl64() handler.
 259 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 260                         LiveProcess *process, ThreadContext *tc);
 261
 262 /// Target setuid() handler.
 263 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 264                                LiveProcess *p, ThreadContext *tc);
 265
 266 /// Target getpid() handler.
 267 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 268                                LiveProcess *p, ThreadContext *tc);
 269
 270 /// Target getuid() handler.
 271 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 272                                LiveProcess *p, ThreadContext *tc);
 273
 274 /// Target getgid() handler.
 275 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 276                                LiveProcess *p, ThreadContext *tc);
 277
 278 /// Target getppid() handler.
 279 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 280                                LiveProcess *p, ThreadContext *tc);
 281
 282 /// Target geteuid() handler.
 283 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 284                                LiveProcess *p, ThreadContext *tc);
 285
 286 /// Target getegid() handler.
 287 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 288                                LiveProcess *p, ThreadContext *tc);
 289
 290
 291
 292 /// Pseudo Funcs  - These functions use a different return convension,
 293 /// returning a second value in a register other than the normal return register
 294 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 295                              LiveProcess *process, ThreadContext *tc);
 296
 297 /// Target getpidPseudo() handler.
 298 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 299                                LiveProcess *p, ThreadContext *tc);
 300
 301 /// Target getuidPseudo() handler.
 302 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 303                                LiveProcess *p, ThreadContext *tc);
 304
 305 /// Target getgidPseudo() handler.
 306 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 307                                LiveProcess *p, ThreadContext *tc);
 308
 309
 310 /// A readable name for 1,000,000, for converting microseconds to seconds.
 311 const int one_million = 1000000;
 312
 313 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 314 /// by my reckoning.  We want to keep this a constant (not use the
 315 /// real-world time) to keep simulations repeatable.
 316 const unsigned seconds_since_epoch = 1000000000;
 317
 318 /// Helper function to convert current elapsed time to seconds and
 319 /// microseconds.
 320 template <class T1, class T2>
 321 void
 322 getElapsedTime(T1 &sec, T2 &usec)
 323 {
 324     int elapsed_usecs = curTick / Clock::Int::us;
 325     sec = elapsed_usecs / one_million;
 326     usec = elapsed_usecs % one_million;
 327 }
 328
 329 //////////////////////////////////////////////////////////////////////
 330 //
 331 // The following emulation functions are generic, but need to be
 332 // templated to account for differences in types, constants, etc.
 333 //
 334 //////////////////////////////////////////////////////////////////////
 335
 336 #if NO_STAT64
 337     typedef struct stat hst_stat;
 338     typedef struct stat hst_stat64;
 339 #else
 340     typedef struct stat hst_stat;
 341     typedef struct stat64 hst_stat64;
 342 #endif
 343
 344 //// Helper function to convert a host stat buffer to a target stat
 345 //// buffer.  Also copies the target buffer out to the simulated
 346 //// memory space.  Used by stat(), fstat(), and lstat().
 347
 348 template <typename target_stat, typename host_stat>
 349 static void
 350 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 351 {
 352     if (fakeTTY)
 353         tgt->st_dev = 0xA;
 354     else
 355         tgt->st_dev = host->st_dev;
 356     tgt->st_dev = htog(tgt->st_dev);
 357     tgt->st_ino = host->st_ino;
 358     tgt->st_ino = htog(tgt->st_ino);
 359     if (fakeTTY)
 360         tgt->st_rdev = 0x880d;
 361     else
 362         tgt->st_rdev = host->st_rdev;
 363     tgt->st_rdev = htog(tgt->st_rdev);
 364     tgt->st_size = host->st_size;
 365     tgt->st_size = htog(tgt->st_size);
 366     tgt->st_atimeX = host->st_atime;
 367     tgt->st_atimeX = htog(tgt->st_atimeX);
 368     tgt->st_mtimeX = host->st_mtime;
 369     tgt->st_mtimeX = htog(tgt->st_mtimeX);
 370     tgt->st_ctimeX = host->st_ctime;
 371     tgt->st_ctimeX = htog(tgt->st_ctimeX);
 372     tgt->st_blksize = host->st_blksize;
 373     tgt->st_blksize = htog(tgt->st_blksize);
 374     tgt->st_blocks = host->st_blocks;
 375     tgt->st_blocks = htog(tgt->st_blocks);
 376 }
 377
 378 // Same for stat64
 379
 380 template <typename target_stat, typename host_stat64>
 381 static void
 382 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 383 {
 384     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 385 #if defined(STAT_HAVE_NSEC)
 386     tgt->st_atime_nsec = host->st_atime_nsec;
 387     tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
 388     tgt->st_mtime_nsec = host->st_mtime_nsec;
 389     tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
 390     tgt->st_ctime_nsec = host->st_ctime_nsec;
 391     tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
 392 #else
 393     tgt->st_atime_nsec = 0;
 394     tgt->st_mtime_nsec = 0;
 395     tgt->st_ctime_nsec = 0;
 396 #endif
 397 }
 398
 399 //Here are a couple convenience functions
 400 template<class OS>
 401 static void
 402 copyOutStatBuf(TranslatingPort * mem, Addr addr,
 403         hst_stat *host, bool fakeTTY = false)
 404 {
 405     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 406     tgt_stat_buf tgt(addr);
 407     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 408     tgt.copyOut(mem);
 409 }
 410
 411 template<class OS>
 412 static void
 413 copyOutStat64Buf(TranslatingPort * mem, Addr addr,
 414         hst_stat64 *host, bool fakeTTY = false)
 415 {
 416     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 417     tgt_stat_buf tgt(addr);
 418     convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 419     tgt.copyOut(mem);
 420 }
 421
 422 /// Target ioctl() handler.  For the most part, programs call ioctl()
 423 /// only to find out if their stdout is a tty, to determine whether to
 424 /// do line or block buffering.
 425 template <class OS>
 426 SyscallReturn
 427 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 428           ThreadContext *tc)
 429 {
 430     int fd = tc->getSyscallArg(0);
 431     unsigned req = tc->getSyscallArg(1);
 432
 433     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 434
 435     if (fd < 0 || process->sim_fd(fd) < 0) {
 436         // doesn't map to any simulator fd: not a valid target fd
 437         return -EBADF;
 438     }
 439
 440     switch (req) {
 441       case OS::TIOCISATTY:
 442       case OS::TIOCGETP:
 443       case OS::TIOCSETP:
 444       case OS::TIOCSETN:
 445       case OS::TIOCSETC:
 446       case OS::TIOCGETC:
 447       case OS::TIOCGETS:
 448       case OS::TIOCGETA:
 449         return -ENOTTY;
 450
 451       default:
 452         fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
 453               fd, req, tc->readPC());
 454     }
 455 }
 456
 457 /// Target open() handler.
 458 template <class OS>
 459 SyscallReturn
 460 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 461          ThreadContext *tc)
 462 {
 463     std::string path;
 464
 465     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 466         return -EFAULT;
 467
 468     if (path == "/dev/sysdev0") {
 469         // This is a memory-mapped high-resolution timer device on Alpha.
 470         // We don't support it, so just punt.
 471         warn("Ignoring open(%s, ...)\n", path);
 472         return -ENOENT;
 473     }
 474
 475     int tgtFlags = tc->getSyscallArg(1);
 476     int mode = tc->getSyscallArg(2);
 477     int hostFlags = 0;
 478
 479     // translate open flags
 480     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 481         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 482             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 483             hostFlags |= OS::openFlagTable[i].hostFlag;
 484         }
 485     }
 486
 487     // any target flags left?
 488     if (tgtFlags != 0)
 489         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 490
 491 #ifdef __CYGWIN32__
 492     hostFlags |= O_BINARY;
 493 #endif
 494
 495     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 496
 497     // open the file
 498     int fd = open(path.c_str(), hostFlags, mode);
 499
 500     return (fd == -1) ? -errno : process->alloc_fd(fd);
 501 }
 502
 503
 504 /// Target chmod() handler.
 505 template <class OS>
 506 SyscallReturn
 507 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 508           ThreadContext *tc)
 509 {
 510     std::string path;
 511
 512     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 513         return -EFAULT;
 514
 515     uint32_t mode = tc->getSyscallArg(1);
 516     mode_t hostMode = 0;
 517
 518     // XXX translate mode flags via OS::something???
 519     hostMode = mode;
 520
 521     // do the chmod
 522     int result = chmod(path.c_str(), hostMode);
 523     if (result < 0)
 524         return -errno;
 525
 526     return 0;
 527 }
 528
 529
 530 /// Target fchmod() handler.
 531 template <class OS>
 532 SyscallReturn
 533 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 534            ThreadContext *tc)
 535 {
 536     int fd = tc->getSyscallArg(0);
 537     if (fd < 0 || process->sim_fd(fd) < 0) {
 538         // doesn't map to any simulator fd: not a valid target fd
 539         return -EBADF;
 540     }
 541
 542     uint32_t mode = tc->getSyscallArg(1);
 543     mode_t hostMode = 0;
 544
 545     // XXX translate mode flags via OS::someting???
 546     hostMode = mode;
 547
 548     // do the fchmod
 549     int result = fchmod(process->sim_fd(fd), hostMode);
 550     if (result < 0)
 551         return -errno;
 552
 553     return 0;
 554 }
 555
 556
 557 /// Target stat() handler.
 558 template <class OS>
 559 SyscallReturn
 560 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 561          ThreadContext *tc)
 562 {
 563     std::string path;
 564
 565     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 566     return -EFAULT;
 567
 568     struct stat hostBuf;
 569     int result = stat(path.c_str(), &hostBuf);
 570
 571     if (result < 0)
 572         return -errno;
 573
 574     copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
 575
 576     return 0;
 577 }
 578
 579
 580 /// Target fstat64() handler.
 581 template <class OS>
 582 SyscallReturn
 583 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 584             ThreadContext *tc)
 585 {
 586     int fd = tc->getSyscallArg(0);
 587     if (fd < 0 || process->sim_fd(fd) < 0) {
 588         // doesn't map to any simulator fd: not a valid target fd
 589         return -EBADF;
 590     }
 591
 592 #if NO_STAT64
 593     struct stat  hostBuf;
 594     int result = fstat(process->sim_fd(fd), &hostBuf);
 595 #else
 596     struct stat64  hostBuf;
 597     int result = fstat64(process->sim_fd(fd), &hostBuf);
 598 #endif
 599
 600     if (result < 0)
 601         return -errno;
 602
 603     copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
 604         &hostBuf, (fd == 1));
 605
 606     return 0;
 607 }
 608
 609
 610 /// Target lstat() handler.
 611 template <class OS>
 612 SyscallReturn
 613 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 614           ThreadContext *tc)
 615 {
 616     std::string path;
 617
 618     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 619       return -EFAULT;
 620
 621     struct stat hostBuf;
 622     int result = lstat(path.c_str(), &hostBuf);
 623
 624     if (result < 0)
 625         return -errno;
 626
 627     copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
 628
 629     return 0;
 630 }
 631
 632 /// Target lstat64() handler.
 633 template <class OS>
 634 SyscallReturn
 635 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 636             ThreadContext *tc)
 637 {
 638     std::string path;
 639
 640     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 641       return -EFAULT;
 642
 643 #if NO_STAT64
 644     struct stat hostBuf;
 645     int result = lstat(path.c_str(), &hostBuf);
 646 #else
 647     struct stat64 hostBuf;
 648     int result = lstat64(path.c_str(), &hostBuf);
 649 #endif
 650
 651     if (result < 0)
 652         return -errno;
 653
 654     copyOutStat64Buf<OS>(tc->getMemPort(), tc->getSyscallArg(1), &hostBuf);
 655
 656     return 0;
 657 }
 658
 659 /// Target fstat() handler.
 660 template <class OS>
 661 SyscallReturn
 662 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 663           ThreadContext *tc)
 664 {
 665     int fd = process->sim_fd(tc->getSyscallArg(0));
 666
 667     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
 668
 669     if (fd < 0)
 670         return -EBADF;
 671
 672     struct stat hostBuf;
 673     int result = fstat(fd, &hostBuf);
 674
 675     if (result < 0)
 676         return -errno;
 677
 678     copyOutStatBuf<OS>(tc->getMemPort(), tc->getSyscallArg(1),
 679         &hostBuf, (fd == 1));
 680
 681     return 0;
 682 }
 683
 684
 685 /// Target statfs() handler.
 686 template <class OS>
 687 SyscallReturn
 688 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 689            ThreadContext *tc)
 690 {
 691     std::string path;
 692
 693     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 694       return -EFAULT;
 695
 696     struct statfs hostBuf;
 697     int result = statfs(path.c_str(), &hostBuf);
 698
 699     if (result < 0)
 700         return -errno;
 701
 702     OS::copyOutStatfsBuf(tc->getMemPort(),
 703             (Addr)(tc->getSyscallArg(1)), &hostBuf);
 704
 705     return 0;
 706 }
 707
 708
 709 /// Target fstatfs() handler.
 710 template <class OS>
 711 SyscallReturn
 712 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 713             ThreadContext *tc)
 714 {
 715     int fd = process->sim_fd(tc->getSyscallArg(0));
 716
 717     if (fd < 0)
 718         return -EBADF;
 719
 720     struct statfs hostBuf;
 721     int result = fstatfs(fd, &hostBuf);
 722
 723     if (result < 0)
 724         return -errno;
 725
 726     OS::copyOutStatfsBuf(tc->getMemPort(), tc->getSyscallArg(1),
 727         &hostBuf);
 728
 729     return 0;
 730 }
 731
 732
 733 /// Target writev() handler.
 734 template <class OS>
 735 SyscallReturn
 736 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 737            ThreadContext *tc)
 738 {
 739     int fd = tc->getSyscallArg(0);
 740     if (fd < 0 || process->sim_fd(fd) < 0) {
 741         // doesn't map to any simulator fd: not a valid target fd
 742         return -EBADF;
 743     }
 744
 745     TranslatingPort *p = tc->getMemPort();
 746     uint64_t tiov_base = tc->getSyscallArg(1);
 747     size_t count = tc->getSyscallArg(2);
 748     struct iovec hiov[count];
 749     for (int i = 0; i < count; ++i)
 750     {
 751         typename OS::tgt_iovec tiov;
 752
 753         p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
 754                     (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
 755         hiov[i].iov_len = gtoh(tiov.iov_len);
 756         hiov[i].iov_base = new char [hiov[i].iov_len];
 757         p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
 758                     hiov[i].iov_len);
 759     }
 760
 761     int result = writev(process->sim_fd(fd), hiov, count);
 762
 763     for (int i = 0; i < count; ++i)
 764     {
 765         delete [] (char *)hiov[i].iov_base;
 766     }
 767
 768     if (result < 0)
 769         return -errno;
 770
 771     return 0;
 772 }
 773
 774
 775 /// Target mmap() handler.
 776 ///
 777 /// We don't really handle mmap().  If the target is mmaping an
 778 /// anonymous region or /dev/zero, we can get away with doing basically
 779 /// nothing (since memory is initialized to zero and the simulator
 780 /// doesn't really check addresses anyway).  Always print a warning,
 781 /// since this could be seriously broken if we're not mapping
 782 /// /dev/zero.
 783 //
 784 /// Someday we should explicitly check for /dev/zero in open, flag the
 785 /// file descriptor, and fail (or implement!) a non-anonymous mmap to
 786 /// anything else.
 787 template <class OS>
 788 SyscallReturn
 789 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
 790 {
 791     Addr start = tc->getSyscallArg(0);
 792     uint64_t length = tc->getSyscallArg(1);
 793     // int prot = tc->getSyscallArg(2);
 794     int flags = tc->getSyscallArg(3);
 795     // int fd = p->sim_fd(tc->getSyscallArg(4));
 796     // int offset = tc->getSyscallArg(5);
 797
 798     if ((start  % TheISA::VMPageSize) != 0 ||
 799         (length % TheISA::VMPageSize) != 0) {
 800         warn("mmap failing: arguments not page-aligned: "
 801              "start 0x%x length 0x%x",
 802              start, length);
 803         return -EINVAL;
 804     }
 805
 806     if (start != 0) {
 807         warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
 808              start, p->mmap_end);
 809     }
 810
 811     // pick next address from our "mmap region"
 812     start = p->mmap_end;
 813     p->pTable->allocate(start, length);
 814     p->mmap_end += length;
 815
 816     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
 817         warn("allowing mmap of file @ fd %d. "
 818              "This will break if not /dev/zero.", tc->getSyscallArg(4));
 819     }
 820
 821     return start;
 822 }
 823
 824 /// Target getrlimit() handler.
 825 template <class OS>
 826 SyscallReturn
 827 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 828         ThreadContext *tc)
 829 {
 830     unsigned resource = tc->getSyscallArg(0);
 831     TypedBufferArg<typename OS::rlimit> rlp(tc->getSyscallArg(1));
 832
 833     switch (resource) {
 834         case OS::TGT_RLIMIT_STACK:
 835             // max stack size in bytes: make up a number (2MB for now)
 836             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
 837             rlp->rlim_cur = htog(rlp->rlim_cur);
 838             rlp->rlim_max = htog(rlp->rlim_max);
 839             break;
 840
 841         default:
 842             std::cerr << "getrlimitFunc: unimplemented resource " << resource
 843                 << std::endl;
 844             abort();
 845             break;
 846     }
 847
 848     rlp.copyOut(tc->getMemPort());
 849     return 0;
 850 }
 851
 852 /// Target gettimeofday() handler.
 853 template <class OS>
 854 SyscallReturn
 855 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 856         ThreadContext *tc)
 857 {
 858     TypedBufferArg<typename OS::timeval> tp(tc->getSyscallArg(0));
 859
 860     getElapsedTime(tp->tv_sec, tp->tv_usec);
 861     tp->tv_sec += seconds_since_epoch;
 862     tp->tv_sec = htog(tp->tv_sec);
 863     tp->tv_usec = htog(tp->tv_usec);
 864
 865     tp.copyOut(tc->getMemPort());
 866
 867     return 0;
 868 }
 869
 870
 871 /// Target utimes() handler.
 872 template <class OS>
 873 SyscallReturn
 874 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 875            ThreadContext *tc)
 876 {
 877     std::string path;
 878
 879     if (!tc->getMemPort()->tryReadString(path, tc->getSyscallArg(0)))
 880       return -EFAULT;
 881
 882     TypedBufferArg<typename OS::timeval [2]> tp(tc->getSyscallArg(1));
 883     tp.copyIn(tc->getMemPort());
 884
 885     struct timeval hostTimeval[2];
 886     for (int i = 0; i < 2; ++i)
 887     {
 888         hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
 889         hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
 890     }
 891     int result = utimes(path.c_str(), hostTimeval);
 892
 893     if (result < 0)
 894         return -errno;
 895
 896     return 0;
 897 }
 898 /// Target getrusage() function.
 899 template <class OS>
 900 SyscallReturn
 901 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 902               ThreadContext *tc)
 903 {
 904     int who = tc->getSyscallArg(0);     // THREAD, SELF, or CHILDREN
 905     TypedBufferArg<typename OS::rusage> rup(tc->getSyscallArg(1));
 906
 907     if (who != OS::TGT_RUSAGE_SELF) {
 908         // don't really handle THREAD or CHILDREN, but just warn and
 909         // plow ahead
 910         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
 911              who);
 912     }
 913
 914     getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
 915     rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
 916     rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
 917
 918     rup->ru_stime.tv_sec = 0;
 919     rup->ru_stime.tv_usec = 0;
 920     rup->ru_maxrss = 0;
 921     rup->ru_ixrss = 0;
 922     rup->ru_idrss = 0;
 923     rup->ru_isrss = 0;
 924     rup->ru_minflt = 0;
 925     rup->ru_majflt = 0;
 926     rup->ru_nswap = 0;
 927     rup->ru_inblock = 0;
 928     rup->ru_oublock = 0;
 929     rup->ru_msgsnd = 0;
 930     rup->ru_msgrcv = 0;
 931     rup->ru_nsignals = 0;
 932     rup->ru_nvcsw = 0;
 933     rup->ru_nivcsw = 0;
 934
 935     rup.copyOut(tc->getMemPort());
 936
 937     return 0;
 938 }
 939
 940
 941
 942
 943 #endif // __SIM_SYSCALL_EMUL_HH__