syscall_emul.hh revision 6685
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 "config/the_isa.hh" 59#include "cpu/base.hh" 60#include "cpu/thread_context.hh" 61#include "mem/translating_port.hh" 62#include "mem/page_table.hh" 63#include "sim/system.hh" 64#include "sim/process.hh" 65 66/// 67/// System call descriptor. 68/// 69class SyscallDesc { 70 71 public: 72 73 /// Typedef for target syscall handler functions. 74 typedef SyscallReturn (*FuncPtr)(SyscallDesc *, int num, 75 LiveProcess *, ThreadContext *); 76 77 const char *name; //!< Syscall name (e.g., "open"). 78 FuncPtr funcPtr; //!< Pointer to emulation function. 79 int flags; //!< Flags (see Flags enum). 80 81 /// Flag values for controlling syscall behavior. 82 enum Flags { 83 /// Don't set return regs according to funcPtr return value. 84 /// Used for syscalls with non-standard return conventions 85 /// that explicitly set the ThreadContext regs (e.g., 86 /// sigreturn). 87 SuppressReturnValue = 1 88 }; 89 90 /// Constructor. 91 SyscallDesc(const char *_name, FuncPtr _funcPtr, int _flags = 0) 92 : name(_name), funcPtr(_funcPtr), flags(_flags) 93 { 94 } 95 96 /// Emulate the syscall. Public interface for calling through funcPtr. 97 void doSyscall(int callnum, LiveProcess *proc, ThreadContext *tc); 98}; 99 100 101class BaseBufferArg { 102 103 public: 104 105 BaseBufferArg(Addr _addr, int _size) : addr(_addr), size(_size) 106 { 107 bufPtr = new uint8_t[size]; 108 // clear out buffer: in case we only partially populate this, 109 // and then do a copyOut(), we want to make sure we don't 110 // introduce any random junk into the simulated address space 111 memset(bufPtr, 0, size); 112 } 113 114 virtual ~BaseBufferArg() { delete [] bufPtr; } 115 116 // 117 // copy data into simulator space (read from target memory) 118 // 119 virtual bool copyIn(TranslatingPort *memport) 120 { 121 memport->readBlob(addr, bufPtr, size); 122 return true; // no EFAULT detection for now 123 } 124 125 // 126 // copy data out of simulator space (write to target memory) 127 // 128 virtual bool copyOut(TranslatingPort *memport) 129 { 130 memport->writeBlob(addr, bufPtr, size); 131 return true; // no EFAULT detection for now 132 } 133 134 protected: 135 Addr addr; 136 int size; 137 uint8_t *bufPtr; 138}; 139 140 141class BufferArg : public BaseBufferArg 142{ 143 public: 144 BufferArg(Addr _addr, int _size) : BaseBufferArg(_addr, _size) { } 145 void *bufferPtr() { return bufPtr; } 146}; 147 148template <class T> 149class TypedBufferArg : public BaseBufferArg 150{ 151 public: 152 // user can optionally specify a specific number of bytes to 153 // allocate to deal with those structs that have variable-size 154 // arrays at the end 155 TypedBufferArg(Addr _addr, int _size = sizeof(T)) 156 : BaseBufferArg(_addr, _size) 157 { } 158 159 // type case 160 operator T*() { return (T *)bufPtr; } 161 162 // dereference operators 163 T &operator*() { return *((T *)bufPtr); } 164 T* operator->() { return (T *)bufPtr; } 165 T &operator[](int i) { return ((T *)bufPtr)[i]; } 166}; 167 168////////////////////////////////////////////////////////////////////// 169// 170// The following emulation functions are generic enough that they 171// don't need to be recompiled for different emulated OS's. They are 172// defined in sim/syscall_emul.cc. 173// 174////////////////////////////////////////////////////////////////////// 175 176 177/// Handler for unimplemented syscalls that we haven't thought about. 178SyscallReturn unimplementedFunc(SyscallDesc *desc, int num, 179 LiveProcess *p, ThreadContext *tc); 180 181/// Handler for unimplemented syscalls that we never intend to 182/// implement (signal handling, etc.) and should not affect the correct 183/// behavior of the program. Print a warning only if the appropriate 184/// trace flag is enabled. Return success to the target program. 185SyscallReturn ignoreFunc(SyscallDesc *desc, int num, 186 LiveProcess *p, ThreadContext *tc); 187 188/// Target exit() handler: terminate current context. 189SyscallReturn exitFunc(SyscallDesc *desc, int num, 190 LiveProcess *p, ThreadContext *tc); 191 192/// Target exit_group() handler: terminate simulation. (exit all threads) 193SyscallReturn exitGroupFunc(SyscallDesc *desc, int num, 194 LiveProcess *p, ThreadContext *tc); 195 196/// Target getpagesize() handler. 197SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num, 198 LiveProcess *p, ThreadContext *tc); 199 200/// Target brk() handler: set brk address. 201SyscallReturn brkFunc(SyscallDesc *desc, int num, 202 LiveProcess *p, ThreadContext *tc); 203 204/// Target close() handler. 205SyscallReturn closeFunc(SyscallDesc *desc, int num, 206 LiveProcess *p, ThreadContext *tc); 207 208/// Target read() handler. 209SyscallReturn readFunc(SyscallDesc *desc, int num, 210 LiveProcess *p, ThreadContext *tc); 211 212/// Target write() handler. 213SyscallReturn writeFunc(SyscallDesc *desc, int num, 214 LiveProcess *p, ThreadContext *tc); 215 216/// Target lseek() handler. 217SyscallReturn lseekFunc(SyscallDesc *desc, int num, 218 LiveProcess *p, ThreadContext *tc); 219 220/// Target _llseek() handler. 221SyscallReturn _llseekFunc(SyscallDesc *desc, int num, 222 LiveProcess *p, ThreadContext *tc); 223 224/// Target munmap() handler. 225SyscallReturn munmapFunc(SyscallDesc *desc, int num, 226 LiveProcess *p, ThreadContext *tc); 227 228/// Target gethostname() handler. 229SyscallReturn gethostnameFunc(SyscallDesc *desc, int num, 230 LiveProcess *p, ThreadContext *tc); 231 232/// Target getcwd() handler. 233SyscallReturn getcwdFunc(SyscallDesc *desc, int num, 234 LiveProcess *p, ThreadContext *tc); 235 236/// Target unlink() handler. 237SyscallReturn readlinkFunc(SyscallDesc *desc, int num, 238 LiveProcess *p, ThreadContext *tc); 239 240/// Target unlink() handler. 241SyscallReturn unlinkFunc(SyscallDesc *desc, int num, 242 LiveProcess *p, ThreadContext *tc); 243 244/// Target mkdir() handler. 245SyscallReturn mkdirFunc(SyscallDesc *desc, int num, 246 LiveProcess *p, ThreadContext *tc); 247 248/// Target rename() handler. 249SyscallReturn renameFunc(SyscallDesc *desc, int num, 250 LiveProcess *p, ThreadContext *tc); 251 252 253/// Target truncate() handler. 254SyscallReturn truncateFunc(SyscallDesc *desc, int num, 255 LiveProcess *p, ThreadContext *tc); 256 257 258/// Target ftruncate() handler. 259SyscallReturn ftruncateFunc(SyscallDesc *desc, int num, 260 LiveProcess *p, ThreadContext *tc); 261 262 263/// Target ftruncate64() handler. 264SyscallReturn ftruncate64Func(SyscallDesc *desc, int num, 265 LiveProcess *p, ThreadContext *tc); 266 267 268/// Target umask() handler. 269SyscallReturn umaskFunc(SyscallDesc *desc, int num, 270 LiveProcess *p, ThreadContext *tc); 271 272 273/// Target chown() handler. 274SyscallReturn chownFunc(SyscallDesc *desc, int num, 275 LiveProcess *p, ThreadContext *tc); 276 277 278/// Target fchown() handler. 279SyscallReturn fchownFunc(SyscallDesc *desc, int num, 280 LiveProcess *p, ThreadContext *tc); 281 282/// Target dup() handler. 283SyscallReturn dupFunc(SyscallDesc *desc, int num, 284 LiveProcess *process, ThreadContext *tc); 285 286/// Target fnctl() handler. 287SyscallReturn fcntlFunc(SyscallDesc *desc, int num, 288 LiveProcess *process, ThreadContext *tc); 289 290/// Target fcntl64() handler. 291SyscallReturn fcntl64Func(SyscallDesc *desc, int num, 292 LiveProcess *process, ThreadContext *tc); 293 294/// Target setuid() handler. 295SyscallReturn setuidFunc(SyscallDesc *desc, int num, 296 LiveProcess *p, ThreadContext *tc); 297 298/// Target getpid() handler. 299SyscallReturn getpidFunc(SyscallDesc *desc, int num, 300 LiveProcess *p, ThreadContext *tc); 301 302/// Target getuid() handler. 303SyscallReturn getuidFunc(SyscallDesc *desc, int num, 304 LiveProcess *p, ThreadContext *tc); 305 306/// Target getgid() handler. 307SyscallReturn getgidFunc(SyscallDesc *desc, int num, 308 LiveProcess *p, ThreadContext *tc); 309 310/// Target getppid() handler. 311SyscallReturn getppidFunc(SyscallDesc *desc, int num, 312 LiveProcess *p, ThreadContext *tc); 313 314/// Target geteuid() handler. 315SyscallReturn geteuidFunc(SyscallDesc *desc, int num, 316 LiveProcess *p, ThreadContext *tc); 317 318/// Target getegid() handler. 319SyscallReturn getegidFunc(SyscallDesc *desc, int num, 320 LiveProcess *p, ThreadContext *tc); 321 322/// Target clone() handler. 323SyscallReturn cloneFunc(SyscallDesc *desc, int num, 324 LiveProcess *p, ThreadContext *tc); 325 326 327/// Pseudo Funcs - These functions use a different return convension, 328/// returning a second value in a register other than the normal return register 329SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, 330 LiveProcess *process, ThreadContext *tc); 331 332/// Target getpidPseudo() handler. 333SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, 334 LiveProcess *p, ThreadContext *tc); 335 336/// Target getuidPseudo() handler. 337SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, 338 LiveProcess *p, ThreadContext *tc); 339 340/// Target getgidPseudo() handler. 341SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, 342 LiveProcess *p, ThreadContext *tc); 343 344 345/// A readable name for 1,000,000, for converting microseconds to seconds. 346const int one_million = 1000000; 347 348/// Approximate seconds since the epoch (1/1/1970). About a billion, 349/// by my reckoning. We want to keep this a constant (not use the 350/// real-world time) to keep simulations repeatable. 351const unsigned seconds_since_epoch = 1000000000; 352 353/// Helper function to convert current elapsed time to seconds and 354/// microseconds. 355template <class T1, class T2> 356void 357getElapsedTime(T1 &sec, T2 &usec) 358{ 359 int elapsed_usecs = curTick / Clock::Int::us; 360 sec = elapsed_usecs / one_million; 361 usec = elapsed_usecs % one_million; 362} 363 364////////////////////////////////////////////////////////////////////// 365// 366// The following emulation functions are generic, but need to be 367// templated to account for differences in types, constants, etc. 368// 369////////////////////////////////////////////////////////////////////// 370 371#if NO_STAT64 372 typedef struct stat hst_stat; 373 typedef struct stat hst_stat64; 374#else 375 typedef struct stat hst_stat; 376 typedef struct stat64 hst_stat64; 377#endif 378 379//// Helper function to convert a host stat buffer to a target stat 380//// buffer. Also copies the target buffer out to the simulated 381//// memory space. Used by stat(), fstat(), and lstat(). 382 383template <typename target_stat, typename host_stat> 384static void 385convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) 386{ 387 using namespace TheISA; 388 389 if (fakeTTY) 390 tgt->st_dev = 0xA; 391 else 392 tgt->st_dev = host->st_dev; 393 tgt->st_dev = htog(tgt->st_dev); 394 tgt->st_ino = host->st_ino; 395 tgt->st_ino = htog(tgt->st_ino); 396 tgt->st_mode = host->st_mode; 397 if (fakeTTY) { 398 // Claim to be a character device 399 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT 400 tgt->st_mode |= S_IFCHR; // Set S_IFCHR 401 } 402 tgt->st_mode = htog(tgt->st_mode); 403 tgt->st_nlink = host->st_nlink; 404 tgt->st_nlink = htog(tgt->st_nlink); 405 tgt->st_uid = host->st_uid; 406 tgt->st_uid = htog(tgt->st_uid); 407 tgt->st_gid = host->st_gid; 408 tgt->st_gid = htog(tgt->st_gid); 409 if (fakeTTY) 410 tgt->st_rdev = 0x880d; 411 else 412 tgt->st_rdev = host->st_rdev; 413 tgt->st_rdev = htog(tgt->st_rdev); 414 tgt->st_size = host->st_size; 415 tgt->st_size = htog(tgt->st_size); 416 tgt->st_atimeX = host->st_atime; 417 tgt->st_atimeX = htog(tgt->st_atimeX); 418 tgt->st_mtimeX = host->st_mtime; 419 tgt->st_mtimeX = htog(tgt->st_mtimeX); 420 tgt->st_ctimeX = host->st_ctime; 421 tgt->st_ctimeX = htog(tgt->st_ctimeX); 422 // Force the block size to be 8k. This helps to ensure buffered io works 423 // consistently across different hosts. 424 tgt->st_blksize = 0x2000; 425 tgt->st_blksize = htog(tgt->st_blksize); 426 tgt->st_blocks = host->st_blocks; 427 tgt->st_blocks = htog(tgt->st_blocks); 428} 429 430// Same for stat64 431 432template <typename target_stat, typename host_stat64> 433static void 434convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) 435{ 436 using namespace TheISA; 437 438 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); 439#if defined(STAT_HAVE_NSEC) 440 tgt->st_atime_nsec = host->st_atime_nsec; 441 tgt->st_atime_nsec = htog(tgt->st_atime_nsec); 442 tgt->st_mtime_nsec = host->st_mtime_nsec; 443 tgt->st_mtime_nsec = htog(tgt->st_mtime_nsec); 444 tgt->st_ctime_nsec = host->st_ctime_nsec; 445 tgt->st_ctime_nsec = htog(tgt->st_ctime_nsec); 446#else 447 tgt->st_atime_nsec = 0; 448 tgt->st_mtime_nsec = 0; 449 tgt->st_ctime_nsec = 0; 450#endif 451} 452 453//Here are a couple convenience functions 454template<class OS> 455static void 456copyOutStatBuf(TranslatingPort * mem, Addr addr, 457 hst_stat *host, bool fakeTTY = false) 458{ 459 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; 460 tgt_stat_buf tgt(addr); 461 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); 462 tgt.copyOut(mem); 463} 464 465template<class OS> 466static void 467copyOutStat64Buf(TranslatingPort * mem, Addr addr, 468 hst_stat64 *host, bool fakeTTY = false) 469{ 470 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; 471 tgt_stat_buf tgt(addr); 472 convertStatBuf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); 473 tgt.copyOut(mem); 474} 475 476/// Target ioctl() handler. For the most part, programs call ioctl() 477/// only to find out if their stdout is a tty, to determine whether to 478/// do line or block buffering. 479template <class OS> 480SyscallReturn 481ioctlFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 482 ThreadContext *tc) 483{ 484 int fd = process->getSyscallArg(tc, 0); 485 unsigned req = process->getSyscallArg(tc, 1); 486 487 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", fd, req); 488 489 if (fd < 0 || process->sim_fd(fd) < 0) { 490 // doesn't map to any simulator fd: not a valid target fd 491 return -EBADF; 492 } 493 494 switch (req) { 495 case OS::TIOCISATTY_: 496 case OS::TIOCGETP_: 497 case OS::TIOCSETP_: 498 case OS::TIOCSETN_: 499 case OS::TIOCSETC_: 500 case OS::TIOCGETC_: 501 case OS::TIOCGETS_: 502 case OS::TIOCGETA_: 503 return -ENOTTY; 504 505 default: 506 fatal("Unsupported ioctl call: ioctl(%d, 0x%x, ...) @ 0x%llx\n", 507 fd, req, tc->readPC()); 508 } 509} 510 511/// Target open() handler. 512template <class OS> 513SyscallReturn 514openFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 515 ThreadContext *tc) 516{ 517 std::string path; 518 519 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 520 return -EFAULT; 521 522 if (path == "/dev/sysdev0") { 523 // This is a memory-mapped high-resolution timer device on Alpha. 524 // We don't support it, so just punt. 525 warn("Ignoring open(%s, ...)\n", path); 526 return -ENOENT; 527 } 528 529 int tgtFlags = process->getSyscallArg(tc, 1); 530 int mode = process->getSyscallArg(tc, 2); 531 int hostFlags = 0; 532 533 // translate open flags 534 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { 535 if (tgtFlags & OS::openFlagTable[i].tgtFlag) { 536 tgtFlags &= ~OS::openFlagTable[i].tgtFlag; 537 hostFlags |= OS::openFlagTable[i].hostFlag; 538 } 539 } 540 541 // any target flags left? 542 if (tgtFlags != 0) 543 warn("Syscall: open: cannot decode flags 0x%x", tgtFlags); 544 545#ifdef __CYGWIN32__ 546 hostFlags |= O_BINARY; 547#endif 548 549 // Adjust path for current working directory 550 path = process->fullPath(path); 551 552 DPRINTF(SyscallVerbose, "opening file %s\n", path.c_str()); 553 554 int fd; 555 if (!path.compare(0, 6, "/proc/") || !path.compare(0, 8, "/system/") || 556 !path.compare(0, 10, "/platform/") || !path.compare(0, 5, "/sys/")) { 557 // It's a proc/sys entery and requires special handling 558 fd = OS::openSpecialFile(path, process, tc); 559 return (fd == -1) ? -1 : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false); 560 } else { 561 // open the file 562 fd = open(path.c_str(), hostFlags, mode); 563 return (fd == -1) ? -errno : process->alloc_fd(fd,path.c_str(),hostFlags,mode, false); 564 } 565 566} 567 568/// Target sysinfo() handler. 569template <class OS> 570SyscallReturn 571sysinfoFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 572 ThreadContext *tc) 573{ 574 575 TypedBufferArg<typename OS::tgt_sysinfo> sysinfo(process->getSyscallArg(tc, 0)); 576 577 sysinfo->uptime=seconds_since_epoch; 578 sysinfo->totalram=process->system->memSize(); 579 580 sysinfo.copyOut(tc->getMemPort()); 581 582 return 0; 583} 584 585/// Target chmod() handler. 586template <class OS> 587SyscallReturn 588chmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 589 ThreadContext *tc) 590{ 591 std::string path; 592 593 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 594 return -EFAULT; 595 596 uint32_t mode = process->getSyscallArg(tc, 1); 597 mode_t hostMode = 0; 598 599 // XXX translate mode flags via OS::something??? 600 hostMode = mode; 601 602 // Adjust path for current working directory 603 path = process->fullPath(path); 604 605 // do the chmod 606 int result = chmod(path.c_str(), hostMode); 607 if (result < 0) 608 return -errno; 609 610 return 0; 611} 612 613 614/// Target fchmod() handler. 615template <class OS> 616SyscallReturn 617fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 618 ThreadContext *tc) 619{ 620 int fd = process->getSyscallArg(tc, 0); 621 if (fd < 0 || process->sim_fd(fd) < 0) { 622 // doesn't map to any simulator fd: not a valid target fd 623 return -EBADF; 624 } 625 626 uint32_t mode = process->getSyscallArg(tc, 1); 627 mode_t hostMode = 0; 628 629 // XXX translate mode flags via OS::someting??? 630 hostMode = mode; 631 632 // do the fchmod 633 int result = fchmod(process->sim_fd(fd), hostMode); 634 if (result < 0) 635 return -errno; 636 637 return 0; 638} 639 640/// Target mremap() handler. 641template <class OS> 642SyscallReturn 643mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc) 644{ 645 Addr start = process->getSyscallArg(tc, 0); 646 uint64_t old_length = process->getSyscallArg(tc, 1); 647 uint64_t new_length = process->getSyscallArg(tc, 2); 648 uint64_t flags = process->getSyscallArg(tc, 3); 649 650 if ((start % TheISA::VMPageSize != 0) || 651 (new_length % TheISA::VMPageSize != 0)) { 652 warn("mremap failing: arguments not page aligned"); 653 return -EINVAL; 654 } 655 656 if (new_length > old_length) { 657 if ((start + old_length) == process->mmap_end) { 658 uint64_t diff = new_length - old_length; 659 process->pTable->allocate(process->mmap_end, diff); 660 process->mmap_end += diff; 661 return start; 662 } else { 663 // sys/mman.h defined MREMAP_MAYMOVE 664 if (!(flags & 1)) { 665 warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); 666 return -ENOMEM; 667 } else { 668 process->pTable->remap(start, old_length, process->mmap_end); 669 warn("mremapping to totally new vaddr %08p-%08p, adding %d\n", 670 process->mmap_end, process->mmap_end + new_length, new_length); 671 start = process->mmap_end; 672 // add on the remaining unallocated pages 673 process->pTable->allocate(start + old_length, new_length - old_length); 674 process->mmap_end += new_length; 675 warn("returning %08p as start\n", start); 676 return start; 677 } 678 } 679 } else { 680 process->pTable->deallocate(start + new_length, old_length - 681 new_length); 682 return start; 683 } 684} 685 686/// Target stat() handler. 687template <class OS> 688SyscallReturn 689statFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 690 ThreadContext *tc) 691{ 692 std::string path; 693 694 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 695 return -EFAULT; 696 697 // Adjust path for current working directory 698 path = process->fullPath(path); 699 700 struct stat hostBuf; 701 int result = stat(path.c_str(), &hostBuf); 702 703 if (result < 0) 704 return -errno; 705 706 copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1), 707 &hostBuf); 708 709 return 0; 710} 711 712 713/// Target stat64() handler. 714template <class OS> 715SyscallReturn 716stat64Func(SyscallDesc *desc, int callnum, LiveProcess *process, 717 ThreadContext *tc) 718{ 719 std::string path; 720 721 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 722 return -EFAULT; 723 724 // Adjust path for current working directory 725 path = process->fullPath(path); 726 727#if NO_STAT64 728 struct stat hostBuf; 729 int result = stat(path.c_str(), &hostBuf); 730#else 731 struct stat64 hostBuf; 732 int result = stat64(path.c_str(), &hostBuf); 733#endif 734 735 if (result < 0) 736 return -errno; 737 738 copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1), 739 &hostBuf); 740 741 return 0; 742} 743 744 745/// Target fstat64() handler. 746template <class OS> 747SyscallReturn 748fstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process, 749 ThreadContext *tc) 750{ 751 int fd = process->getSyscallArg(tc, 0); 752 if (fd < 0 || process->sim_fd(fd) < 0) { 753 // doesn't map to any simulator fd: not a valid target fd 754 return -EBADF; 755 } 756 757#if NO_STAT64 758 struct stat hostBuf; 759 int result = fstat(process->sim_fd(fd), &hostBuf); 760#else 761 struct stat64 hostBuf; 762 int result = fstat64(process->sim_fd(fd), &hostBuf); 763#endif 764 765 if (result < 0) 766 return -errno; 767 768 copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1), 769 &hostBuf, (fd == 1)); 770 771 return 0; 772} 773 774 775/// Target lstat() handler. 776template <class OS> 777SyscallReturn 778lstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 779 ThreadContext *tc) 780{ 781 std::string path; 782 783 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 784 return -EFAULT; 785 786 // Adjust path for current working directory 787 path = process->fullPath(path); 788 789 struct stat hostBuf; 790 int result = lstat(path.c_str(), &hostBuf); 791 792 if (result < 0) 793 return -errno; 794 795 copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1), 796 &hostBuf); 797 798 return 0; 799} 800 801/// Target lstat64() handler. 802template <class OS> 803SyscallReturn 804lstat64Func(SyscallDesc *desc, int callnum, LiveProcess *process, 805 ThreadContext *tc) 806{ 807 std::string path; 808 809 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 810 return -EFAULT; 811 812 // Adjust path for current working directory 813 path = process->fullPath(path); 814 815#if NO_STAT64 816 struct stat hostBuf; 817 int result = lstat(path.c_str(), &hostBuf); 818#else 819 struct stat64 hostBuf; 820 int result = lstat64(path.c_str(), &hostBuf); 821#endif 822 823 if (result < 0) 824 return -errno; 825 826 copyOutStat64Buf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1), 827 &hostBuf); 828 829 return 0; 830} 831 832/// Target fstat() handler. 833template <class OS> 834SyscallReturn 835fstatFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 836 ThreadContext *tc) 837{ 838 int fd = process->sim_fd(process->getSyscallArg(tc, 0)); 839 840 DPRINTF(SyscallVerbose, "fstat(%d, ...)\n", fd); 841 842 if (fd < 0) 843 return -EBADF; 844 845 struct stat hostBuf; 846 int result = fstat(fd, &hostBuf); 847 848 if (result < 0) 849 return -errno; 850 851 copyOutStatBuf<OS>(tc->getMemPort(), process->getSyscallArg(tc, 1), 852 &hostBuf, (fd == 1)); 853 854 return 0; 855} 856 857 858/// Target statfs() handler. 859template <class OS> 860SyscallReturn 861statfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 862 ThreadContext *tc) 863{ 864 std::string path; 865 866 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 867 return -EFAULT; 868 869 // Adjust path for current working directory 870 path = process->fullPath(path); 871 872 struct statfs hostBuf; 873 int result = statfs(path.c_str(), &hostBuf); 874 875 if (result < 0) 876 return -errno; 877 878 OS::copyOutStatfsBuf(tc->getMemPort(), 879 (Addr)(process->getSyscallArg(tc, 1)), &hostBuf); 880 881 return 0; 882} 883 884 885/// Target fstatfs() handler. 886template <class OS> 887SyscallReturn 888fstatfsFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 889 ThreadContext *tc) 890{ 891 int fd = process->sim_fd(process->getSyscallArg(tc, 0)); 892 893 if (fd < 0) 894 return -EBADF; 895 896 struct statfs hostBuf; 897 int result = fstatfs(fd, &hostBuf); 898 899 if (result < 0) 900 return -errno; 901 902 OS::copyOutStatfsBuf(tc->getMemPort(), process->getSyscallArg(tc, 1), 903 &hostBuf); 904 905 return 0; 906} 907 908 909/// Target writev() handler. 910template <class OS> 911SyscallReturn 912writevFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 913 ThreadContext *tc) 914{ 915 int fd = process->getSyscallArg(tc, 0); 916 if (fd < 0 || process->sim_fd(fd) < 0) { 917 // doesn't map to any simulator fd: not a valid target fd 918 return -EBADF; 919 } 920 921 TranslatingPort *p = tc->getMemPort(); 922 uint64_t tiov_base = process->getSyscallArg(tc, 1); 923 size_t count = process->getSyscallArg(tc, 2); 924 struct iovec hiov[count]; 925 for (size_t i = 0; i < count; ++i) { 926 typename OS::tgt_iovec tiov; 927 928 p->readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), 929 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); 930 hiov[i].iov_len = gtoh(tiov.iov_len); 931 hiov[i].iov_base = new char [hiov[i].iov_len]; 932 p->readBlob(gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, 933 hiov[i].iov_len); 934 } 935 936 int result = writev(process->sim_fd(fd), hiov, count); 937 938 for (size_t i = 0; i < count; ++i) 939 delete [] (char *)hiov[i].iov_base; 940 941 if (result < 0) 942 return -errno; 943 944 return 0; 945} 946 947 948/// Target mmap() handler. 949/// 950/// We don't really handle mmap(). If the target is mmaping an 951/// anonymous region or /dev/zero, we can get away with doing basically 952/// nothing (since memory is initialized to zero and the simulator 953/// doesn't really check addresses anyway). Always print a warning, 954/// since this could be seriously broken if we're not mapping 955/// /dev/zero. 956// 957/// Someday we should explicitly check for /dev/zero in open, flag the 958/// file descriptor, and fail (or implement!) a non-anonymous mmap to 959/// anything else. 960template <class OS> 961SyscallReturn 962mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) 963{ 964 Addr start = p->getSyscallArg(tc, 0); 965 uint64_t length = p->getSyscallArg(tc, 1); 966 // int prot = p->getSyscallArg(tc, 2); 967 int flags = p->getSyscallArg(tc, 3); 968 // int fd = p->sim_fd(p->getSyscallArg(tc, 4)); 969 // int offset = p->getSyscallArg(tc, 5); 970 971 972 if ((start % TheISA::VMPageSize) != 0 || 973 (length % TheISA::VMPageSize) != 0) { 974 warn("mmap failing: arguments not page-aligned: " 975 "start 0x%x length 0x%x", 976 start, length); 977 return -EINVAL; 978 } 979 980 if (start != 0) { 981 warn("mmap: ignoring suggested map address 0x%x, using 0x%x", 982 start, p->mmap_end); 983 } 984 985 // pick next address from our "mmap region" 986 if (OS::mmapGrowsDown()) { 987 start = p->mmap_end - length; 988 p->mmap_end = start; 989 } else { 990 start = p->mmap_end; 991 p->mmap_end += length; 992 } 993 p->pTable->allocate(start, length); 994 995 if (!(flags & OS::TGT_MAP_ANONYMOUS)) { 996 warn("allowing mmap of file @ fd %d. " 997 "This will break if not /dev/zero.", p->getSyscallArg(tc, 4)); 998 } 999 1000 return start; 1001} 1002 1003/// Target getrlimit() handler. 1004template <class OS> 1005SyscallReturn 1006getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1007 ThreadContext *tc) 1008{ 1009 unsigned resource = process->getSyscallArg(tc, 0); 1010 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, 1)); 1011 1012 switch (resource) { 1013 case OS::TGT_RLIMIT_STACK: 1014 // max stack size in bytes: make up a number (8MB for now) 1015 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1016 rlp->rlim_cur = htog(rlp->rlim_cur); 1017 rlp->rlim_max = htog(rlp->rlim_max); 1018 break; 1019 1020 case OS::TGT_RLIMIT_DATA: 1021 // max data segment size in bytes: make up a number 1022 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; 1023 rlp->rlim_cur = htog(rlp->rlim_cur); 1024 rlp->rlim_max = htog(rlp->rlim_max); 1025 break; 1026 1027 default: 1028 std::cerr << "getrlimitFunc: unimplemented resource " << resource 1029 << std::endl; 1030 abort(); 1031 break; 1032 } 1033 1034 rlp.copyOut(tc->getMemPort()); 1035 return 0; 1036} 1037 1038/// Target gettimeofday() handler. 1039template <class OS> 1040SyscallReturn 1041gettimeofdayFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1042 ThreadContext *tc) 1043{ 1044 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, 0)); 1045 1046 getElapsedTime(tp->tv_sec, tp->tv_usec); 1047 tp->tv_sec += seconds_since_epoch; 1048 tp->tv_sec = TheISA::htog(tp->tv_sec); 1049 tp->tv_usec = TheISA::htog(tp->tv_usec); 1050 1051 tp.copyOut(tc->getMemPort()); 1052 1053 return 0; 1054} 1055 1056 1057/// Target utimes() handler. 1058template <class OS> 1059SyscallReturn 1060utimesFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1061 ThreadContext *tc) 1062{ 1063 std::string path; 1064 1065 if (!tc->getMemPort()->tryReadString(path, process->getSyscallArg(tc, 0))) 1066 return -EFAULT; 1067 1068 TypedBufferArg<typename OS::timeval [2]> tp(process->getSyscallArg(tc, 1)); 1069 tp.copyIn(tc->getMemPort()); 1070 1071 struct timeval hostTimeval[2]; 1072 for (int i = 0; i < 2; ++i) 1073 { 1074 hostTimeval[i].tv_sec = gtoh((*tp)[i].tv_sec); 1075 hostTimeval[i].tv_usec = gtoh((*tp)[i].tv_usec); 1076 } 1077 1078 // Adjust path for current working directory 1079 path = process->fullPath(path); 1080 1081 int result = utimes(path.c_str(), hostTimeval); 1082 1083 if (result < 0) 1084 return -errno; 1085 1086 return 0; 1087} 1088/// Target getrusage() function. 1089template <class OS> 1090SyscallReturn 1091getrusageFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1092 ThreadContext *tc) 1093{ 1094 int who = process->getSyscallArg(tc, 0); // THREAD, SELF, or CHILDREN 1095 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, 1)); 1096 1097 rup->ru_utime.tv_sec = 0; 1098 rup->ru_utime.tv_usec = 0; 1099 rup->ru_stime.tv_sec = 0; 1100 rup->ru_stime.tv_usec = 0; 1101 rup->ru_maxrss = 0; 1102 rup->ru_ixrss = 0; 1103 rup->ru_idrss = 0; 1104 rup->ru_isrss = 0; 1105 rup->ru_minflt = 0; 1106 rup->ru_majflt = 0; 1107 rup->ru_nswap = 0; 1108 rup->ru_inblock = 0; 1109 rup->ru_oublock = 0; 1110 rup->ru_msgsnd = 0; 1111 rup->ru_msgrcv = 0; 1112 rup->ru_nsignals = 0; 1113 rup->ru_nvcsw = 0; 1114 rup->ru_nivcsw = 0; 1115 1116 switch (who) { 1117 case OS::TGT_RUSAGE_SELF: 1118 getElapsedTime(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); 1119 rup->ru_utime.tv_sec = htog(rup->ru_utime.tv_sec); 1120 rup->ru_utime.tv_usec = htog(rup->ru_utime.tv_usec); 1121 break; 1122 1123 case OS::TGT_RUSAGE_CHILDREN: 1124 // do nothing. We have no child processes, so they take no time. 1125 break; 1126 1127 default: 1128 // don't really handle THREAD or CHILDREN, but just warn and 1129 // plow ahead 1130 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", 1131 who); 1132 } 1133 1134 rup.copyOut(tc->getMemPort()); 1135 1136 return 0; 1137} 1138 1139/// Target times() function. 1140template <class OS> 1141SyscallReturn 1142timesFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1143 ThreadContext *tc) 1144{ 1145 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, 0)); 1146 1147 // Fill in the time structure (in clocks) 1148 int64_t clocks = curTick * OS::_SC_CLK_TCK / Clock::Int::s; 1149 bufp->tms_utime = clocks; 1150 bufp->tms_stime = 0; 1151 bufp->tms_cutime = 0; 1152 bufp->tms_cstime = 0; 1153 1154 // Convert to host endianness 1155 bufp->tms_utime = htog(bufp->tms_utime); 1156 1157 // Write back 1158 bufp.copyOut(tc->getMemPort()); 1159 1160 // Return clock ticks since system boot 1161 return clocks; 1162} 1163 1164/// Target time() function. 1165template <class OS> 1166SyscallReturn 1167timeFunc(SyscallDesc *desc, int callnum, LiveProcess *process, 1168 ThreadContext *tc) 1169{ 1170 typename OS::time_t sec, usec; 1171 getElapsedTime(sec, usec); 1172 sec += seconds_since_epoch; 1173 1174 Addr taddr = (Addr)process->getSyscallArg(tc, 0); 1175 if(taddr != 0) { 1176 typename OS::time_t t = sec; 1177 t = htog(t); 1178 TranslatingPort *p = tc->getMemPort(); 1179 p->writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t)); 1180 } 1181 return sec; 1182} 1183 1184 1185#endif // __SIM_SYSCALL_EMUL_HH__ 1186