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 "base/chunk_generator.hh"
  54 #include "base/intmath.hh"      // for RoundUp
  55 #include "base/misc.hh"
  56 #include "base/trace.hh"
  57 #include "base/types.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/system.hh"
  63 #include "sim/process.hh"
  64
  65 ///
  66 /// System call descriptor.
  67 ///
  68 class SyscallDesc {
  69
  70   public:
  71
  72     /// Typedef for target syscall handler functions.
  73     typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num,
  74                            LiveProcess *, ThreadContext *);
  75
  76     const char *name;   //!< Syscall name (e.g., "open").
  77     FuncPtr funcPtr;    //!< Pointer to emulation function.
  78     int flags;          //!< Flags (see Flags enum).
  79
  80     /// Flag values for controlling syscall behavior.
  81     enum Flags {
  82         /// Don't set return regs according to funcPtr return value.
  83         /// Used for syscalls with non-standard return conventions
  84         /// that explicitly set the ThreadContext regs (e.g.,
  85         /// sigreturn).
  86         SuppressReturnValue = 1
  87     };
  88
  89     /// Constructor.
  90     SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0)
  91         : name(_name), funcPtr(_funcPtr), flags(_flags)
  92     {
  93     }
  94
  95     /// Emulate the syscall.  Public interface for calling through funcPtr.
  96     void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc);
  97 };
  98
  99
 100 class BaseBufferArg {
 101
 102   public:
 103
 104     BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size)
 105     {
 106         bufPtr = new uint8_t[size];
 107         // clear out buffer: in case we only partially populate this,
 108         // and then do a copyOut(), we want to make sure we don't
 109         // introduce any random junk into the simulated address space
 110         memset(bufPtr, 0, size);
 111     }
 112
 113     virtual ~BaseBufferArg() { delete [] bufPtr; }
 114
 115     //
 116     // copy data into simulator space (read from target memory)
 117     //
 118     virtual bool copyIn(TranslatingPort *memport)
 119     {
 120         memport->readBlob(addr, bufPtr, size);
 121         return true;    // no EFAULT detection for now
 122     }
 123
 124     //
 125     // copy data out of simulator space (write to target memory)
 126     //
 127     virtual bool copyOut(TranslatingPort *memport)
 128     {
 129         memport->writeBlob(addr, bufPtr, size);
 130         return true;    // no EFAULT detection for now
 131     }
 132
 133   protected:
 134     Addr addr;
 135     int size;
 136     uint8_t *bufPtr;
 137 };
 138
 139
 140 class BufferArg : public BaseBufferArg
 141 {
 142   public:
 143     BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { }
 144     void *bufferPtr()   { return bufPtr; }
 145 };
 146
 147 template <class T>
 148 class TypedBufferArg : public BaseBufferArg
 149 {
 150   public:
 151     // user can optionally specify a specific number of bytes to
 152     // allocate to deal with those structs that have variable-size
 153     // arrays at the end
 154     TypedBufferArg(Addr _addr, int _size = sizeof(T))
 155         : BaseBufferArg(_addr, _size)
 156     { }
 157
 158     // type case
 159     operator T*() { return (T *)bufPtr; }
 160
 161     // dereference operators
 162     T &operator*()       { return *((T *)bufPtr); }
 163     T* operator->()      { return (T *)bufPtr; }
 164     T &operator[](int i) { return ((T *)bufPtr)[i]; }
 165 };
 166
 167 //////////////////////////////////////////////////////////////////////
 168 //
 169 // The following emulation functions are generic enough that they
 170 // don't need to be recompiled for different emulated OS's.  They are
 171 // defined in sim/syscall_emul.cc.
 172 //
 173 //////////////////////////////////////////////////////////////////////
 174
 175
 176 /// Handler for unimplemented syscalls that we haven't thought about.
 177 SyscallReturn unimplementedFunc(SyscallDesc *desc, int num,
 178                                 LiveProcess *p, ThreadContext *tc);
 179
 180 /// Handler for unimplemented syscalls that we never intend to
 181 /// implement (signal handling, etc.) and should not affect the correct
 182 /// behavior of the program.  Print a warning only if the appropriate
 183 /// trace flag is enabled.  Return success to the target program.
 184 SyscallReturn ignoreFunc(SyscallDesc *desc, int num,
 185                          LiveProcess *p, ThreadContext *tc);
 186
 187 /// Target exit() handler: terminate current context.
 188 SyscallReturn exitFunc(SyscallDesc *desc, int num,
 189                        LiveProcess *p, ThreadContext *tc);
 190
 191 /// Target exit_group() handler: terminate simulation. (exit all threads)
 192 SyscallReturn exitGroupFunc(SyscallDesc *desc, int num,
 193                        LiveProcess *p, ThreadContext *tc);
 194
 195 /// Target getpagesize() handler.
 196 SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num,
 197                               LiveProcess *p, ThreadContext *tc);
 198
 199 /// Target brk() handler: set brk address.
 200 SyscallReturn brkFunc(SyscallDesc *desc, int num,
 201                       LiveProcess *p, ThreadContext *tc);
 202
 203 /// Target close() handler.
 204 SyscallReturn closeFunc(SyscallDesc *desc, int num,
 205                         LiveProcess *p, ThreadContext *tc);
 206
 207 /// Target read() handler.
 208 SyscallReturn readFunc(SyscallDesc *desc, int num,
 209                        LiveProcess *p, ThreadContext *tc);
 210
 211 /// Target write() handler.
 212 SyscallReturn writeFunc(SyscallDesc *desc, int num,
 213                         LiveProcess *p, ThreadContext *tc);
 214
 215 /// Target lseek() handler.
 216 SyscallReturn lseekFunc(SyscallDesc *desc, int num,
 217                         LiveProcess *p, ThreadContext *tc);
 218
 219 /// Target _llseek() handler.
 220 SyscallReturn _llseekFunc(SyscallDesc *desc, int num,
 221                         LiveProcess *p, ThreadContext *tc);
 222
 223 /// Target munmap() handler.
 224 SyscallReturn munmapFunc(SyscallDesc *desc, int num,
 225                          LiveProcess *p, ThreadContext *tc);
 226
 227 /// Target gethostname() handler.
 228 SyscallReturn gethostnameFunc(SyscallDesc *desc, int num,
 229                               LiveProcess *p, ThreadContext *tc);
 230
 231 /// Target getcwd() handler.
 232 SyscallReturn getcwdFunc(SyscallDesc *desc, int num,
 233                          LiveProcess *p, ThreadContext *tc);
 234
 235 /// Target unlink() handler.
 236 SyscallReturn readlinkFunc(SyscallDesc *desc, int num,
 237                            LiveProcess *p, ThreadContext *tc);
 238
 239 /// Target unlink() handler.
 240 SyscallReturn unlinkFunc(SyscallDesc *desc, int num,
 241                          LiveProcess *p, ThreadContext *tc);
 242
 243 /// Target mkdir() handler.
 244 SyscallReturn mkdirFunc(SyscallDesc *desc, int num,
 245                         LiveProcess *p, ThreadContext *tc);
 246
 247 /// Target rename() handler.
 248 SyscallReturn renameFunc(SyscallDesc *desc, int num,
 249                          LiveProcess *p, ThreadContext *tc);
 250
 251
 252 /// Target truncate() handler.
 253 SyscallReturn truncateFunc(SyscallDesc *desc, int num,
 254                            LiveProcess *p, ThreadContext *tc);
 255
 256
 257 /// Target ftruncate() handler.
 258 SyscallReturn ftruncateFunc(SyscallDesc *desc, int num,
 259                             LiveProcess *p, ThreadContext *tc);
 260
 261
 262 /// Target umask() handler.
 263 SyscallReturn umaskFunc(SyscallDesc *desc, int num,
 264                         LiveProcess *p, ThreadContext *tc);
 265
 266
 267 /// Target chown() handler.
 268 SyscallReturn chownFunc(SyscallDesc *desc, int num,
 269                         LiveProcess *p, ThreadContext *tc);
 270
 271
 272 /// Target fchown() handler.
 273 SyscallReturn fchownFunc(SyscallDesc *desc, int num,
 274                          LiveProcess *p, ThreadContext *tc);
 275
 276 /// Target dup() handler.
 277 SyscallReturn dupFunc(SyscallDesc *desc, int num,
 278                       LiveProcess *process, ThreadContext *tc);
 279
 280 /// Target fnctl() handler.
 281 SyscallReturn fcntlFunc(SyscallDesc *desc, int num,
 282                         LiveProcess *process, ThreadContext *tc);
 283
 284 /// Target fcntl64() handler.
 285 SyscallReturn fcntl64Func(SyscallDesc *desc, int num,
 286                         LiveProcess *process, ThreadContext *tc);
 287
 288 /// Target setuid() handler.
 289 SyscallReturn setuidFunc(SyscallDesc *desc, int num,
 290                                LiveProcess *p, ThreadContext *tc);
 291
 292 /// Target getpid() handler.
 293 SyscallReturn getpidFunc(SyscallDesc *desc, int num,
 294                                LiveProcess *p, ThreadContext *tc);
 295
 296 /// Target getuid() handler.
 297 SyscallReturn getuidFunc(SyscallDesc *desc, int num,
 298                                LiveProcess *p, ThreadContext *tc);
 299
 300 /// Target getgid() handler.
 301 SyscallReturn getgidFunc(SyscallDesc *desc, int num,
 302                                LiveProcess *p, ThreadContext *tc);
 303
 304 /// Target getppid() handler.
 305 SyscallReturn getppidFunc(SyscallDesc *desc, int num,
 306                                LiveProcess *p, ThreadContext *tc);
 307
 308 /// Target geteuid() handler.
 309 SyscallReturn geteuidFunc(SyscallDesc *desc, int num,
 310                                LiveProcess *p, ThreadContext *tc);
 311
 312 /// Target getegid() handler.
 313 SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 314                                LiveProcess *p, ThreadContext *tc);
 315
 316 /// Target clone() handler.
 317 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
 318                                LiveProcess *p, ThreadContext *tc);
 319
 320
 321 /// Pseudo Funcs  - These functions use a different return convension,
 322 /// returning a second value in a register other than the normal return register
 323 SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num,
 324                              LiveProcess *process, ThreadContext *tc);
 325
 326 /// Target getpidPseudo() handler.
 327 SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num,
 328                                LiveProcess *p, ThreadContext *tc);
 329
 330 /// Target getuidPseudo() handler.
 331 SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num,
 332                                LiveProcess *p, ThreadContext *tc);
 333
 334 /// Target getgidPseudo() handler.
 335 SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num,
 336                                LiveProcess *p, ThreadContext *tc);
 337
 338
 339 /// A readable name for 1,000,000, for converting microseconds to seconds.
 340 const int one_million = 1000000;
 341
 342 /// Approximate seconds since the epoch (1/1/1970).  About a billion,
 343 /// by my reckoning.  We want to keep this a constant (not use the
 344 /// real-world time) to keep simulations repeatable.
 345 const unsigned seconds_since_epoch = 1000000000;
 346
 347 /// Helper function to convert current elapsed time to seconds and
 348 /// microseconds.
 349 template <class T1, class T2>
 350 void
 351 getElapsedTime(T1 &sec, T2 &usec)
 352 {
 353     int elapsed_usecs = curTick / Clock::Int::us;
 354     sec = elapsed_usecs / one_million;
 355     usec = elapsed_usecs % one_million;
 356 }
 357
 358 //////////////////////////////////////////////////////////////////////
 359 //
 360 // The following emulation functions are generic, but need to be
 361 // templated to account for differences in types, constants, etc.
 362 //
 363 //////////////////////////////////////////////////////////////////////
 364
 365 #if NO_STAT64
 366     typedef struct stat hst_stat;
 367     typedef struct stat hst_stat64;
 368 #else
 369     typedef struct stat hst_stat;
 370     typedef struct stat64 hst_stat64;
 371 #endif
 372
 373 //// Helper function to convert a host stat buffer to a target stat
 374 //// buffer.  Also copies the target buffer out to the simulated
 375 //// memory space.  Used by stat(), fstat(), and lstat().
 376
 377 template <typename target_stat, typename host_stat>
 378 static void
 379 convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false)
 380 {
 381     using namespace TheISA;
 382
 383     if (fakeTTY)
 384         tgt->st_dev = 0xA;
 385     else
 386         tgt->st_dev = host->st_dev;
 387     tgt->st_dev = htog(tgt->st_dev);
 388     tgt->st_ino = host->st_ino;
 389     tgt->st_ino = htog(tgt->st_ino);
 390     tgt->st_mode = host->st_mode;
 391     if (fakeTTY) {
 392         // Claim to be a character device
 393         tgt->st_mode &= ~S_IFMT;    // Clear S_IFMT
 394         tgt->st_mode |= S_IFCHR;    // Set S_IFCHR
 395     }
 396     tgt->st_mode = htog(tgt->st_mode);
 397     tgt->st_nlink = host->st_nlink;
 398     tgt->st_nlink = htog(tgt->st_nlink);
 399     tgt->st_uid = host->st_uid;
 400     tgt->st_uid = htog(tgt->st_uid);
 401     tgt->st_gid = host->st_gid;
 402     tgt->st_gid = htog(tgt->st_gid);
 403     if (fakeTTY)
 404         tgt->st_rdev = 0x880d;
 405     else
 406         tgt->st_rdev = host->st_rdev;
 407     tgt->st_rdev = htog(tgt->st_rdev);
 408     tgt->st_size = host->st_size;
 409     tgt->st_size = htog(tgt->st_size);
 410     tgt->st_atimeX = host->st_atime;
 411     tgt->st_atimeX = htog(tgt->st_atimeX);
 412     tgt->st_mtimeX = host->st_mtime;
 413     tgt->st_mtimeX = htog(tgt->st_mtimeX);
 414     tgt->st_ctimeX = host->st_ctime;
 415     tgt->st_ctimeX = htog(tgt->st_ctimeX);
 416     // Force the block size to be 8k. This helps to ensure buffered io works
 417     // consistently across different hosts.
 418     tgt->st_blksize = 0x2000;
 419     tgt->st_blksize = htog(tgt->st_blksize);
 420     tgt->st_blocks = host->st_blocks;
 421     tgt->st_blocks = htog(tgt->st_blocks);
 422 }
 423
 424 // Same for stat64
 425
 426 template <typename target_stat, typename host_stat64>
 427 static void
 428 convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false)
 429 {
 430     using namespace TheISA;
 431
 432     convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY);
 433 #if defined(STAT_HAVE_NSEC)
 434     tgt->st_atime_nsec = host->st_atime_nsec;
 435     tgt->st_atime_nsec = htog(tgt->st_atime_nsec);
 436     tgt->st_mtime_nsec = host->st_mtime_nsec;
 437     tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec);
 438     tgt->st_ctime_nsec = host->st_ctime_nsec;
 439     tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec);
 440 #else
 441     tgt->st_atime_nsec = 0;
 442     tgt->st_mtime_nsec = 0;
 443     tgt->st_ctime_nsec = 0;
 444 #endif
 445 }
 446
 447 //Here are a couple convenience functions
 448 template<class OS>
 449 static void
 450 copyOutStatBuf(TranslatingPort * mem, Addr addr,
 451         hst_stat *host, bool fakeTTY = false)
 452 {
 453     typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf;
 454     tgt_stat_buf tgt(addr);
 455     convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY);
 456     tgt.copyOut(mem);
 457 }
 458
 459 template<class OS>
 460 static void
 461 copyOutStat64Buf(TranslatingPort * mem, Addr addr,
 462         hst_stat64 *host, bool fakeTTY = false)
 463 {
 464     typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf;
 465     tgt_stat_buf tgt(addr);
 466     convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY);
 467     tgt.copyOut(mem);
 468 }
 469
 470 /// Target ioctl() handler.  For the most part, programs call ioctl()
 471 /// only to find out if their stdout is a tty, to determine whether to
 472 /// do line or block buffering.
 473 template <class OS>
 474 SyscallReturn
 475 ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 476           ThreadContext *tc)
 477 {
 478     int fd = process->getSyscallArg(tc, 0);
 479     unsigned req = process->getSyscallArg(tc, 1);
 480
 481     DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req);
 482
 483     if (fd < 0 || process->sim_fd(fd) < 0) {
 484         // doesn't map to any simulator fd: not a valid target fd
 485         return -EBADF;
 486     }
 487
 488     switch (req) {
 489       case OS::TIOCISATTY_:
 490       case OS::TIOCGETP_:
 491       case OS::TIOCSETP_:
 492       case OS::TIOCSETN_:
 493       case OS::TIOCSETC_:
 494       case OS::TIOCGETC_:
 495       case OS::TIOCGETS_:
 496       case OS::TIOCGETA_:
 497         return -ENOTTY;
 498
 499       default:
 500         fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n",
 501               fd, req, tc->readPC());
 502     }
 503 }
 504
 505 /// Target open() handler.
 506 template <class OS>
 507 SyscallReturn
 508 openFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 509          ThreadContext *tc)
 510 {
 511     std::string path;
 512
 513     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 514         return -EFAULT;
 515
 516     if (path == "/dev/sysdev0") {
 517         // This is a memory-mapped high-resolution timer device on Alpha.
 518         // We don't support it, so just punt.
 519         warn("Ignoring open(%s, ...)\n", path);
 520         return -ENOENT;
 521     }
 522
 523     int tgtFlags = process->getSyscallArg(tc, 1);
 524     int mode = process->getSyscallArg(tc, 2);
 525     int hostFlags = 0;
 526
 527     // translate open flags
 528     for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) {
 529         if (tgtFlags & OS::openFlagTable[i].tgtFlag) {
 530             tgtFlags &= ~OS::openFlagTable[i].tgtFlag;
 531             hostFlags |= OS::openFlagTable[i].hostFlag;
 532         }
 533     }
 534
 535     // any target flags left?
 536     if (tgtFlags != 0)
 537         warn("Syscall: open: cannot decode flags 0x%x", tgtFlags);
 538
 539 #ifdef __CYGWIN32__
 540     hostFlags |= O_BINARY;
 541 #endif
 542
 543     // Adjust path for current working directory
 544     path = process->fullPath(path);
 545
 546     DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str());
 547
 548     int fd;
 549     if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") ||
 550         !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) {
 551         // It's a proc/sys entery and requires special handling
 552         fd = OS::openSpecialFile(path, process, tc);
 553         return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
 554      } else {
 555         // open the file
 556         fd = open(path.c_str(), hostFlags, mode);
 557         return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false);
 558      }
 559
 560 }
 561
 562 /// Target sysinfo() handler.
 563 template <class OS>
 564 SyscallReturn
 565 sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 566          ThreadContext *tc)
 567 {
 568
 569    TypedBufferArg<typename OS::tgt_sysinfo> sysinfo(process->getSyscallArg(tc, 0));
 570
 571    sysinfo->uptime=seconds_since_epoch;
 572    sysinfo->totalram=process->system->memSize();
 573
 574    sysinfo.copyOut(tc->getMemPort());
 575
 576    return 0;
 577 }
 578
 579 /// Target chmod() handler.
 580 template <class OS>
 581 SyscallReturn
 582 chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 583           ThreadContext *tc)
 584 {
 585     std::string path;
 586
 587     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 588         return -EFAULT;
 589
 590     uint32_t mode = process->getSyscallArg(tc, 1);
 591     mode_t hostMode = 0;
 592
 593     // XXX translate mode flags via OS::something???
 594     hostMode = mode;
 595
 596     // Adjust path for current working directory
 597     path = process->fullPath(path);
 598
 599     // do the chmod
 600     int result = chmod(path.c_str(), hostMode);
 601     if (result < 0)
 602         return -errno;
 603
 604     return 0;
 605 }
 606
 607
 608 /// Target fchmod() handler.
 609 template <class OS>
 610 SyscallReturn
 611 fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 612            ThreadContext *tc)
 613 {
 614     int fd = process->getSyscallArg(tc, 0);
 615     if (fd < 0 || process->sim_fd(fd) < 0) {
 616         // doesn't map to any simulator fd: not a valid target fd
 617         return -EBADF;
 618     }
 619
 620     uint32_t mode = process->getSyscallArg(tc, 1);
 621     mode_t hostMode = 0;
 622
 623     // XXX translate mode flags via OS::someting???
 624     hostMode = mode;
 625
 626     // do the fchmod
 627     int result = fchmod(process->sim_fd(fd), hostMode);
 628     if (result < 0)
 629         return -errno;
 630
 631     return 0;
 632 }
 633
 634 /// Target mremap() handler.
 635 template <class OS>
 636 SyscallReturn
 637 mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc)
 638 {
 639     Addr start = process->getSyscallArg(tc, 0);
 640     uint64_t old_length = process->getSyscallArg(tc, 1);
 641     uint64_t new_length = process->getSyscallArg(tc, 2);
 642     uint64_t flags = process->getSyscallArg(tc, 3);
 643
 644     if ((start % TheISA::VMPageSize != 0) ||
 645             (new_length % TheISA::VMPageSize != 0)) {
 646         warn("mremap failing: arguments not page aligned");
 647         return -EINVAL;
 648     }
 649
 650     if (new_length > old_length) {
 651         if ((start + old_length) == process->mmap_end) {
 652             uint64_t diff = new_length - old_length;
 653             process->pTable->allocate(process->mmap_end, diff);
 654             process->mmap_end += diff;
 655             return start;
 656         } else {
 657             // sys/mman.h defined MREMAP_MAYMOVE
 658             if (!(flags & 1)) {
 659                 warn("can't remap here and MREMAP_MAYMOVE flag not set\n");
 660                 return -ENOMEM;
 661             } else {
 662                 process->pTable->remap(start, old_length, process->mmap_end);
 663                 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n",
 664                         process->mmap_end, process->mmap_end + new_length, new_length);
 665                 start = process->mmap_end;
 666                 // add on the remaining unallocated pages
 667                 process->pTable->allocate(start + old_length, new_length - old_length);
 668                 process->mmap_end += new_length;
 669                 warn("returning %08p as start\n", start);
 670                 return start;
 671             }
 672         }
 673     } else {
 674         process->pTable->deallocate(start + new_length, old_length -
 675                 new_length);
 676         return start;
 677     }
 678 }
 679
 680 /// Target stat() handler.
 681 template <class OS>
 682 SyscallReturn
 683 statFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 684          ThreadContext *tc)
 685 {
 686     std::string path;
 687
 688     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 689     return -EFAULT;
 690
 691     // Adjust path for current working directory
 692     path = process->fullPath(path);
 693
 694     struct stat hostBuf;
 695     int result = stat(path.c_str(), &hostBuf);
 696
 697     if (result < 0)
 698         return -errno;
 699
 700     copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
 701             &hostBuf);
 702
 703     return 0;
 704 }
 705
 706
 707 /// Target stat64() handler.
 708 template <class OS>
 709 SyscallReturn
 710 stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 711            ThreadContext *tc)
 712 {
 713     std::string path;
 714
 715     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 716         return -EFAULT;
 717
 718     // Adjust path for current working directory
 719     path = process->fullPath(path);
 720
 721 #if NO_STAT64
 722     struct stat  hostBuf;
 723     int result = stat(path.c_str(), &hostBuf);
 724 #else
 725     struct stat64 hostBuf;
 726     int result = stat64(path.c_str(), &hostBuf);
 727 #endif
 728
 729     if (result < 0)
 730         return -errno;
 731
 732     copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
 733             &hostBuf);
 734
 735     return 0;
 736 }
 737
 738
 739 /// Target fstat64() handler.
 740 template <class OS>
 741 SyscallReturn
 742 fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 743             ThreadContext *tc)
 744 {
 745     int fd = process->getSyscallArg(tc, 0);
 746     if (fd < 0 || process->sim_fd(fd) < 0) {
 747         // doesn't map to any simulator fd: not a valid target fd
 748         return -EBADF;
 749     }
 750
 751 #if NO_STAT64
 752     struct stat  hostBuf;
 753     int result = fstat(process->sim_fd(fd), &hostBuf);
 754 #else
 755     struct stat64  hostBuf;
 756     int result = fstat64(process->sim_fd(fd), &hostBuf);
 757 #endif
 758
 759     if (result < 0)
 760         return -errno;
 761
 762     copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
 763         &hostBuf, (fd == 1));
 764
 765     return 0;
 766 }
 767
 768
 769 /// Target lstat() handler.
 770 template <class OS>
 771 SyscallReturn
 772 lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 773           ThreadContext *tc)
 774 {
 775     std::string path;
 776
 777     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 778       return -EFAULT;
 779
 780     // Adjust path for current working directory
 781     path = process->fullPath(path);
 782
 783     struct stat hostBuf;
 784     int result = lstat(path.c_str(), &hostBuf);
 785
 786     if (result < 0)
 787         return -errno;
 788
 789     copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
 790             &hostBuf);
 791
 792     return 0;
 793 }
 794
 795 /// Target lstat64() handler.
 796 template <class OS>
 797 SyscallReturn
 798 lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process,
 799             ThreadContext *tc)
 800 {
 801     std::string path;
 802
 803     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 804       return -EFAULT;
 805
 806     // Adjust path for current working directory
 807     path = process->fullPath(path);
 808
 809 #if NO_STAT64
 810     struct stat hostBuf;
 811     int result = lstat(path.c_str(), &hostBuf);
 812 #else
 813     struct stat64 hostBuf;
 814     int result = lstat64(path.c_str(), &hostBuf);
 815 #endif
 816
 817     if (result < 0)
 818         return -errno;
 819
 820     copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
 821             &hostBuf);
 822
 823     return 0;
 824 }
 825
 826 /// Target fstat() handler.
 827 template <class OS>
 828 SyscallReturn
 829 fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 830           ThreadContext *tc)
 831 {
 832     int fd = process->sim_fd(process->getSyscallArg(tc, 0));
 833
 834     DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd);
 835
 836     if (fd < 0)
 837         return -EBADF;
 838
 839     struct stat hostBuf;
 840     int result = fstat(fd, &hostBuf);
 841
 842     if (result < 0)
 843         return -errno;
 844
 845     copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1),
 846         &hostBuf, (fd == 1));
 847
 848     return 0;
 849 }
 850
 851
 852 /// Target statfs() handler.
 853 template <class OS>
 854 SyscallReturn
 855 statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 856            ThreadContext *tc)
 857 {
 858     std::string path;
 859
 860     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
 861       return -EFAULT;
 862
 863     // Adjust path for current working directory
 864     path = process->fullPath(path);
 865
 866     struct statfs hostBuf;
 867     int result = statfs(path.c_str(), &hostBuf);
 868
 869     if (result < 0)
 870         return -errno;
 871
 872     OS::copyOutStatfsBuf(tc->getMemPort(),
 873             (Addr)(process->getSyscallArg(tc, 1)), &hostBuf);
 874
 875     return 0;
 876 }
 877
 878
 879 /// Target fstatfs() handler.
 880 template <class OS>
 881 SyscallReturn
 882 fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 883             ThreadContext *tc)
 884 {
 885     int fd = process->sim_fd(process->getSyscallArg(tc, 0));
 886
 887     if (fd < 0)
 888         return -EBADF;
 889
 890     struct statfs hostBuf;
 891     int result = fstatfs(fd, &hostBuf);
 892
 893     if (result < 0)
 894         return -errno;
 895
 896     OS::copyOutStatfsBuf(tc->getMemPort(), process->getSyscallArg(tc, 1),
 897         &hostBuf);
 898
 899     return 0;
 900 }
 901
 902
 903 /// Target writev() handler.
 904 template <class OS>
 905 SyscallReturn
 906 writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 907            ThreadContext *tc)
 908 {
 909     int fd = process->getSyscallArg(tc, 0);
 910     if (fd < 0 || process->sim_fd(fd) < 0) {
 911         // doesn't map to any simulator fd: not a valid target fd
 912         return -EBADF;
 913     }
 914
 915     TranslatingPort *p = tc->getMemPort();
 916     uint64_t tiov_base = process->getSyscallArg(tc, 1);
 917     size_t count = process->getSyscallArg(tc, 2);
 918     struct iovec hiov[count];
 919     for (size_t i = 0; i < count; ++i) {
 920         typename OS::tgt_iovec tiov;
 921
 922         p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec),
 923                     (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec));
 924         hiov[i].iov_len = gtoh(tiov.iov_len);
 925         hiov[i].iov_base = new char [hiov[i].iov_len];
 926         p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base,
 927                     hiov[i].iov_len);
 928     }
 929
 930     int result = writev(process->sim_fd(fd), hiov, count);
 931
 932     for (size_t i = 0; i < count; ++i)
 933         delete [] (char *)hiov[i].iov_base;
 934
 935     if (result < 0)
 936         return -errno;
 937
 938     return 0;
 939 }
 940
 941
 942 /// Target mmap() handler.
 943 ///
 944 /// We don't really handle mmap().  If the target is mmaping an
 945 /// anonymous region or /dev/zero, we can get away with doing basically
 946 /// nothing (since memory is initialized to zero and the simulator
 947 /// doesn't really check addresses anyway).  Always print a warning,
 948 /// since this could be seriously broken if we're not mapping
 949 /// /dev/zero.
 950 //
 951 /// Someday we should explicitly check for /dev/zero in open, flag the
 952 /// file descriptor, and fail (or implement!) a non-anonymous mmap to
 953 /// anything else.
 954 template <class OS>
 955 SyscallReturn
 956 mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
 957 {
 958     Addr start = p->getSyscallArg(tc, 0);
 959     uint64_t length = p->getSyscallArg(tc, 1);
 960     // int prot = p->getSyscallArg(tc, 2);
 961     int flags = p->getSyscallArg(tc, 3);
 962     // int fd = p->sim_fd(p->getSyscallArg(tc, 4));
 963     // int offset = p->getSyscallArg(tc, 5);
 964
 965
 966     if ((start  % TheISA::VMPageSize) != 0 ||
 967         (length % TheISA::VMPageSize) != 0) {
 968         warn("mmap failing: arguments not page-aligned: "
 969              "start 0x%x length 0x%x",
 970              start, length);
 971         return -EINVAL;
 972     }
 973
 974     if (start != 0) {
 975         warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
 976              start, p->mmap_end);
 977     }
 978
 979     // pick next address from our "mmap region"
 980     start = p->mmap_end;
 981     p->pTable->allocate(start, length);
 982     p->mmap_end += length;
 983
 984     if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
 985         warn("allowing mmap of file @ fd %d. "
 986              "This will break if not /dev/zero.", p->getSyscallArg(tc, 4));
 987     }
 988
 989     return start;
 990 }
 991
 992 /// Target getrlimit() handler.
 993 template <class OS>
 994 SyscallReturn
 995 getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
 996         ThreadContext *tc)
 997 {
 998     unsigned resource = process->getSyscallArg(tc, 0);
 999     TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, 1));
1000
1001     switch (resource) {
1002         case OS::TGT_RLIMIT_STACK:
1003             // max stack size in bytes: make up a number (8MB for now)
1004             rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
1005             rlp->rlim_cur = htog(rlp->rlim_cur);
1006             rlp->rlim_max = htog(rlp->rlim_max);
1007             break;
1008
1009         case OS::TGT_RLIMIT_DATA:
1010             // max data segment size in bytes: make up a number
1011             rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024;
1012             rlp->rlim_cur = htog(rlp->rlim_cur);
1013             rlp->rlim_max = htog(rlp->rlim_max);
1014             break;
1015
1016         default:
1017             std::cerr << "getrlimitFunc: unimplemented resource " << resource
1018                 << std::endl;
1019             abort();
1020             break;
1021     }
1022
1023     rlp.copyOut(tc->getMemPort());
1024     return 0;
1025 }
1026
1027 /// Target gettimeofday() handler.
1028 template <class OS>
1029 SyscallReturn
1030 gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1031         ThreadContext *tc)
1032 {
1033     TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, 0));
1034
1035     getElapsedTime(tp->tv_sec, tp->tv_usec);
1036     tp->tv_sec += seconds_since_epoch;
1037     tp->tv_sec = TheISA::htog(tp->tv_sec);
1038     tp->tv_usec = TheISA::htog(tp->tv_usec);
1039
1040     tp.copyOut(tc->getMemPort());
1041
1042     return 0;
1043 }
1044
1045
1046 /// Target utimes() handler.
1047 template <class OS>
1048 SyscallReturn
1049 utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1050            ThreadContext *tc)
1051 {
1052     std::string path;
1053
1054     if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0)))
1055       return -EFAULT;
1056
1057     TypedBufferArg<typename OS::timeval [2]> tp(process->getSyscallArg(tc, 1));
1058     tp.copyIn(tc->getMemPort());
1059
1060     struct timeval hostTimeval[2];
1061     for (int i = 0; i < 2; ++i)
1062     {
1063         hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec);
1064         hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec);
1065     }
1066
1067     // Adjust path for current working directory
1068     path = process->fullPath(path);
1069
1070     int result = utimes(path.c_str(), hostTimeval);
1071
1072     if (result < 0)
1073         return -errno;
1074
1075     return 0;
1076 }
1077 /// Target getrusage() function.
1078 template <class OS>
1079 SyscallReturn
1080 getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
1081               ThreadContext *tc)
1082 {
1083     int who = process->getSyscallArg(tc, 0);     // THREAD, SELF, or CHILDREN
1084     TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, 1));
1085
1086     rup->ru_utime.tv_sec = 0;
1087     rup->ru_utime.tv_usec = 0;
1088     rup->ru_stime.tv_sec = 0;
1089     rup->ru_stime.tv_usec = 0;
1090     rup->ru_maxrss = 0;
1091     rup->ru_ixrss = 0;
1092     rup->ru_idrss = 0;
1093     rup->ru_isrss = 0;
1094     rup->ru_minflt = 0;
1095     rup->ru_majflt = 0;
1096     rup->ru_nswap = 0;
1097     rup->ru_inblock = 0;
1098     rup->ru_oublock = 0;
1099     rup->ru_msgsnd = 0;
1100     rup->ru_msgrcv = 0;
1101     rup->ru_nsignals = 0;
1102     rup->ru_nvcsw = 0;
1103     rup->ru_nivcsw = 0;
1104
1105     switch (who) {
1106       case OS::TGT_RUSAGE_SELF:
1107         getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec);
1108         rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec);
1109         rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec);
1110         break;
1111
1112       case OS::TGT_RUSAGE_CHILDREN:
1113         // do nothing.  We have no child processes, so they take no time.
1114         break;
1115
1116       default:
1117         // don't really handle THREAD or CHILDREN, but just warn and
1118         // plow ahead
1119         warn("getrusage() only supports RUSAGE_SELF.  Parameter %d ignored.",
1120              who);
1121     }
1122
1123     rup.copyOut(tc->getMemPort());
1124
1125     return 0;
1126 }
1127
1128
1129
1130
1131 #endif // __SIM_SYSCALL_EMUL_HH__