syscall_emul.cc revision 13571:a320800ceccf
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 * Ali Saidi 30 */ 31 32#include "sim/syscall_emul.hh" 33 34#include <fcntl.h> 35#include <sys/syscall.h> 36#include <unistd.h> 37 38#include <csignal> 39#include <iostream> 40#include <mutex> 41#include <string> 42 43#include "arch/utility.hh" 44#include "base/chunk_generator.hh" 45#include "base/trace.hh" 46#include "config/the_isa.hh" 47#include "cpu/thread_context.hh" 48#include "dev/net/dist_iface.hh" 49#include "mem/page_table.hh" 50#include "sim/byteswap.hh" 51#include "sim/process.hh" 52#include "sim/sim_exit.hh" 53#include "sim/syscall_debug_macros.hh" 54#include "sim/syscall_desc.hh" 55#include "sim/system.hh" 56 57using namespace std; 58using namespace TheISA; 59 60SyscallReturn 61unimplementedFunc(SyscallDesc *desc, int callnum, Process *process, 62 ThreadContext *tc) 63{ 64 fatal("syscall %s (#%d) unimplemented.", desc->name(), callnum); 65 66 return 1; 67} 68 69 70SyscallReturn 71ignoreFunc(SyscallDesc *desc, int callnum, Process *process, 72 ThreadContext *tc) 73{ 74 if (desc->needWarning()) { 75 warn("ignoring syscall %s(...)%s", desc->name(), desc->warnOnce() ? 76 "\n (further warnings will be suppressed)" : ""); 77 } 78 79 return 0; 80} 81 82static void 83exitFutexWake(ThreadContext *tc, Addr addr, uint64_t tgid) 84{ 85 // Clear value at address pointed to by thread's childClearTID field. 86 BufferArg ctidBuf(addr, sizeof(long)); 87 long *ctid = (long *)ctidBuf.bufferPtr(); 88 *ctid = 0; 89 ctidBuf.copyOut(tc->getMemProxy()); 90 91 FutexMap &futex_map = tc->getSystemPtr()->futexMap; 92 // Wake one of the waiting threads. 93 futex_map.wakeup(addr, tgid, 1); 94} 95 96static SyscallReturn 97exitImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 98 bool group) 99{ 100 int index = 0; 101 int status = p->getSyscallArg(tc, index); 102 103 System *sys = tc->getSystemPtr(); 104 105 int activeContexts = 0; 106 for (auto &system: sys->systemList) 107 activeContexts += system->numRunningContexts(); 108 if (activeContexts == 1) { 109 /** 110 * Even though we are terminating the final thread context, dist-gem5 111 * requires the simulation to remain active and provide 112 * synchronization messages to the switch process. So we just halt 113 * the last thread context and return. The simulation will be 114 * terminated by dist-gem5 in a coordinated manner once all nodes 115 * have signaled their readiness to exit. For non dist-gem5 116 * simulations, readyToExit() always returns true. 117 */ 118 if (!DistIface::readyToExit(0)) { 119 tc->halt(); 120 return status; 121 } 122 123 exitSimLoop("exiting with last active thread context", status & 0xff); 124 return status; 125 } 126 127 if (group) 128 *p->exitGroup = true; 129 130 if (p->childClearTID) 131 exitFutexWake(tc, p->childClearTID, p->tgid()); 132 133 bool last_thread = true; 134 Process *parent = nullptr, *tg_lead = nullptr; 135 for (int i = 0; last_thread && i < sys->numContexts(); i++) { 136 Process *walk; 137 if (!(walk = sys->threadContexts[i]->getProcessPtr())) 138 continue; 139 140 /** 141 * Threads in a thread group require special handing. For instance, 142 * we send the SIGCHLD signal so that it appears that it came from 143 * the head of the group. We also only delete file descriptors if 144 * we are the last thread in the thread group. 145 */ 146 if (walk->pid() == p->tgid()) 147 tg_lead = walk; 148 149 if ((sys->threadContexts[i]->status() != ThreadContext::Halted) 150 && (walk != p)) { 151 /** 152 * Check if we share thread group with the pointer; this denotes 153 * that we are not the last thread active in the thread group. 154 * Note that setting this to false also prevents further 155 * iterations of the loop. 156 */ 157 if (walk->tgid() == p->tgid()) 158 last_thread = false; 159 160 /** 161 * A corner case exists which involves execve(). After execve(), 162 * the execve will enable SIGCHLD in the process. The problem 163 * occurs when the exiting process is the root process in the 164 * system; there is no parent to receive the signal. We obviate 165 * this problem by setting the root process' ppid to zero in the 166 * Python configuration files. We really should handle the 167 * root/execve specific case more gracefully. 168 */ 169 if (*p->sigchld && (p->ppid() != 0) && (walk->pid() == p->ppid())) 170 parent = walk; 171 } 172 } 173 174 if (last_thread) { 175 if (parent) { 176 assert(tg_lead); 177 sys->signalList.push_back(BasicSignal(tg_lead, parent, SIGCHLD)); 178 } 179 180 /** 181 * Run though FD array of the exiting process and close all file 182 * descriptors except for the standard file descriptors. 183 * (The standard file descriptors are shared with gem5.) 184 */ 185 for (int i = 0; i < p->fds->getSize(); i++) { 186 if ((*p->fds)[i]) 187 p->fds->closeFDEntry(i); 188 } 189 } 190 191 tc->halt(); 192 return status; 193} 194 195SyscallReturn 196exitFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 197{ 198 return exitImpl(desc, callnum, p, tc, false); 199} 200 201SyscallReturn 202exitGroupFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 203{ 204 return exitImpl(desc, callnum, p, tc, true); 205} 206 207SyscallReturn 208getpagesizeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 209{ 210 return (int)PageBytes; 211} 212 213 214SyscallReturn 215brkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 216{ 217 // change brk addr to first arg 218 int index = 0; 219 Addr new_brk = p->getSyscallArg(tc, index); 220 221 std::shared_ptr<MemState> mem_state = p->memState; 222 Addr brk_point = mem_state->getBrkPoint(); 223 224 // in Linux at least, brk(0) returns the current break value 225 // (note that the syscall and the glibc function have different behavior) 226 if (new_brk == 0) 227 return brk_point; 228 229 if (new_brk > brk_point) { 230 // might need to allocate some new pages 231 for (ChunkGenerator gen(brk_point, 232 new_brk - brk_point, 233 PageBytes); !gen.done(); gen.next()) { 234 if (!p->pTable->translate(gen.addr())) 235 p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes); 236 237 // if the address is already there, zero it out 238 else { 239 uint8_t zero = 0; 240 SETranslatingPortProxy &tp = tc->getMemProxy(); 241 242 // split non-page aligned accesses 243 Addr next_page = roundUp(gen.addr(), PageBytes); 244 uint32_t size_needed = next_page - gen.addr(); 245 tp.memsetBlob(gen.addr(), zero, size_needed); 246 if (gen.addr() + PageBytes > next_page && 247 next_page < new_brk && 248 p->pTable->translate(next_page)) { 249 size_needed = PageBytes - size_needed; 250 tp.memsetBlob(next_page, zero, size_needed); 251 } 252 } 253 } 254 } 255 256 mem_state->setBrkPoint(new_brk); 257 DPRINTF_SYSCALL(Verbose, "brk: break point changed to: %#X\n", 258 mem_state->getBrkPoint()); 259 return mem_state->getBrkPoint(); 260} 261 262SyscallReturn 263setTidAddressFunc(SyscallDesc *desc, int callnum, Process *process, 264 ThreadContext *tc) 265{ 266 int index = 0; 267 uint64_t tidPtr = process->getSyscallArg(tc, index); 268 269 process->childClearTID = tidPtr; 270 return process->pid(); 271} 272 273SyscallReturn 274closeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 275{ 276 int index = 0; 277 int tgt_fd = p->getSyscallArg(tc, index); 278 279 return p->fds->closeFDEntry(tgt_fd); 280} 281 282SyscallReturn 283lseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 284{ 285 int index = 0; 286 int tgt_fd = p->getSyscallArg(tc, index); 287 uint64_t offs = p->getSyscallArg(tc, index); 288 int whence = p->getSyscallArg(tc, index); 289 290 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 291 if (!ffdp) 292 return -EBADF; 293 int sim_fd = ffdp->getSimFD(); 294 295 off_t result = lseek(sim_fd, offs, whence); 296 297 return (result == (off_t)-1) ? -errno : result; 298} 299 300 301SyscallReturn 302_llseekFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 303{ 304 int index = 0; 305 int tgt_fd = p->getSyscallArg(tc, index); 306 uint64_t offset_high = p->getSyscallArg(tc, index); 307 uint32_t offset_low = p->getSyscallArg(tc, index); 308 Addr result_ptr = p->getSyscallArg(tc, index); 309 int whence = p->getSyscallArg(tc, index); 310 311 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 312 if (!ffdp) 313 return -EBADF; 314 int sim_fd = ffdp->getSimFD(); 315 316 uint64_t offset = (offset_high << 32) | offset_low; 317 318 uint64_t result = lseek(sim_fd, offset, whence); 319 result = TheISA::htog(result); 320 321 if (result == (off_t)-1) 322 return -errno; 323 // Assuming that the size of loff_t is 64 bits on the target platform 324 BufferArg result_buf(result_ptr, sizeof(result)); 325 memcpy(result_buf.bufferPtr(), &result, sizeof(result)); 326 result_buf.copyOut(tc->getMemProxy()); 327 return 0; 328} 329 330 331SyscallReturn 332munmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 333{ 334 // With mmap more fully implemented, it might be worthwhile to bite 335 // the bullet and implement munmap. Should allow us to reuse simulated 336 // memory. 337 return 0; 338} 339 340 341const char *hostname = "m5.eecs.umich.edu"; 342 343SyscallReturn 344gethostnameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 345{ 346 int index = 0; 347 Addr buf_ptr = p->getSyscallArg(tc, index); 348 int name_len = p->getSyscallArg(tc, index); 349 BufferArg name(buf_ptr, name_len); 350 351 strncpy((char *)name.bufferPtr(), hostname, name_len); 352 353 name.copyOut(tc->getMemProxy()); 354 355 return 0; 356} 357 358SyscallReturn 359getcwdFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 360{ 361 int result = 0; 362 int index = 0; 363 Addr buf_ptr = p->getSyscallArg(tc, index); 364 unsigned long size = p->getSyscallArg(tc, index); 365 BufferArg buf(buf_ptr, size); 366 367 // Is current working directory defined? 368 string cwd = p->getcwd(); 369 if (!cwd.empty()) { 370 if (cwd.length() >= size) { 371 // Buffer too small 372 return -ERANGE; 373 } 374 strncpy((char *)buf.bufferPtr(), cwd.c_str(), size); 375 result = cwd.length(); 376 } else { 377 if (getcwd((char *)buf.bufferPtr(), size)) { 378 result = strlen((char *)buf.bufferPtr()); 379 } else { 380 result = -1; 381 } 382 } 383 384 buf.copyOut(tc->getMemProxy()); 385 386 return (result == -1) ? -errno : result; 387} 388 389SyscallReturn 390readlinkFunc(SyscallDesc *desc, int callnum, Process *process, 391 ThreadContext *tc) 392{ 393 return readlinkFunc(desc, callnum, process, tc, 0); 394} 395 396SyscallReturn 397readlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 398 int index) 399{ 400 string path; 401 402 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 403 return -EFAULT; 404 405 // Adjust path for current working directory 406 path = p->fullPath(path); 407 408 Addr buf_ptr = p->getSyscallArg(tc, index); 409 size_t bufsiz = p->getSyscallArg(tc, index); 410 411 BufferArg buf(buf_ptr, bufsiz); 412 413 int result = -1; 414 if (path != "/proc/self/exe") { 415 result = readlink(path.c_str(), (char *)buf.bufferPtr(), bufsiz); 416 } else { 417 // Emulate readlink() called on '/proc/self/exe' should return the 418 // absolute path of the binary running in the simulated system (the 419 // Process' executable). It is possible that using this path in 420 // the simulated system will result in unexpected behavior if: 421 // 1) One binary runs another (e.g., -c time -o "my_binary"), and 422 // called binary calls readlink(). 423 // 2) The host's full path to the running benchmark changes from one 424 // simulation to another. This can result in different simulated 425 // performance since the simulated system will process the binary 426 // path differently, even if the binary itself does not change. 427 428 // Get the absolute canonical path to the running application 429 char real_path[PATH_MAX]; 430 char *check_real_path = realpath(p->progName(), real_path); 431 if (!check_real_path) { 432 fatal("readlink('/proc/self/exe') unable to resolve path to " 433 "executable: %s", p->progName()); 434 } 435 strncpy((char*)buf.bufferPtr(), real_path, bufsiz); 436 size_t real_path_len = strlen(real_path); 437 if (real_path_len > bufsiz) { 438 // readlink will truncate the contents of the 439 // path to ensure it is no more than bufsiz 440 result = bufsiz; 441 } else { 442 result = real_path_len; 443 } 444 445 // Issue a warning about potential unexpected results 446 warn_once("readlink() called on '/proc/self/exe' may yield unexpected " 447 "results in various settings.\n Returning '%s'\n", 448 (char*)buf.bufferPtr()); 449 } 450 451 buf.copyOut(tc->getMemProxy()); 452 453 return (result == -1) ? -errno : result; 454} 455 456SyscallReturn 457unlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 458{ 459 return unlinkHelper(desc, num, p, tc, 0); 460} 461 462SyscallReturn 463unlinkHelper(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 464 int index) 465{ 466 string path; 467 468 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 469 return -EFAULT; 470 471 path = p->fullPath(path); 472 473 int result = unlink(path.c_str()); 474 return (result == -1) ? -errno : result; 475} 476 477SyscallReturn 478linkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 479{ 480 string path; 481 string new_path; 482 483 int index = 0; 484 auto &virt_mem = tc->getMemProxy(); 485 if (!virt_mem.tryReadString(path, p->getSyscallArg(tc, index))) 486 return -EFAULT; 487 if (!virt_mem.tryReadString(new_path, p->getSyscallArg(tc, index))) 488 return -EFAULT; 489 490 path = p->fullPath(path); 491 new_path = p->fullPath(new_path); 492 493 int result = link(path.c_str(), new_path.c_str()); 494 return (result == -1) ? -errno : result; 495} 496 497SyscallReturn 498symlinkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 499{ 500 string path; 501 string new_path; 502 503 int index = 0; 504 auto &virt_mem = tc->getMemProxy(); 505 if (!virt_mem.tryReadString(path, p->getSyscallArg(tc, index))) 506 return -EFAULT; 507 if (!virt_mem.tryReadString(new_path, p->getSyscallArg(tc, index))) 508 return -EFAULT; 509 510 path = p->fullPath(path); 511 new_path = p->fullPath(new_path); 512 513 int result = symlink(path.c_str(), new_path.c_str()); 514 return (result == -1) ? -errno : result; 515} 516 517SyscallReturn 518mkdirFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 519{ 520 string path; 521 522 int index = 0; 523 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 524 return -EFAULT; 525 526 // Adjust path for current working directory 527 path = p->fullPath(path); 528 529 mode_t mode = p->getSyscallArg(tc, index); 530 531 int result = mkdir(path.c_str(), mode); 532 return (result == -1) ? -errno : result; 533} 534 535SyscallReturn 536renameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 537{ 538 string old_name; 539 540 int index = 0; 541 if (!tc->getMemProxy().tryReadString(old_name, p->getSyscallArg(tc, index))) 542 return -EFAULT; 543 544 string new_name; 545 546 if (!tc->getMemProxy().tryReadString(new_name, p->getSyscallArg(tc, index))) 547 return -EFAULT; 548 549 // Adjust path for current working directory 550 old_name = p->fullPath(old_name); 551 new_name = p->fullPath(new_name); 552 553 int64_t result = rename(old_name.c_str(), new_name.c_str()); 554 return (result == -1) ? -errno : result; 555} 556 557SyscallReturn 558truncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 559{ 560 string path; 561 562 int index = 0; 563 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 564 return -EFAULT; 565 566 off_t length = p->getSyscallArg(tc, index); 567 568 // Adjust path for current working directory 569 path = p->fullPath(path); 570 571 int result = truncate(path.c_str(), length); 572 return (result == -1) ? -errno : result; 573} 574 575SyscallReturn 576ftruncateFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 577{ 578 int index = 0; 579 int tgt_fd = p->getSyscallArg(tc, index); 580 off_t length = p->getSyscallArg(tc, index); 581 582 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 583 if (!ffdp) 584 return -EBADF; 585 int sim_fd = ffdp->getSimFD(); 586 587 int result = ftruncate(sim_fd, length); 588 return (result == -1) ? -errno : result; 589} 590 591SyscallReturn 592truncate64Func(SyscallDesc *desc, int num, 593 Process *process, ThreadContext *tc) 594{ 595 int index = 0; 596 string path; 597 598 if (!tc->getMemProxy().tryReadString(path, process->getSyscallArg(tc, index))) 599 return -EFAULT; 600 601 int64_t length = process->getSyscallArg(tc, index, 64); 602 603 // Adjust path for current working directory 604 path = process->fullPath(path); 605 606#if NO_STAT64 607 int result = truncate(path.c_str(), length); 608#else 609 int result = truncate64(path.c_str(), length); 610#endif 611 return (result == -1) ? -errno : result; 612} 613 614SyscallReturn 615ftruncate64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 616{ 617 int index = 0; 618 int tgt_fd = p->getSyscallArg(tc, index); 619 int64_t length = p->getSyscallArg(tc, index, 64); 620 621 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 622 if (!ffdp) 623 return -EBADF; 624 int sim_fd = ffdp->getSimFD(); 625 626#if NO_STAT64 627 int result = ftruncate(sim_fd, length); 628#else 629 int result = ftruncate64(sim_fd, length); 630#endif 631 return (result == -1) ? -errno : result; 632} 633 634SyscallReturn 635umaskFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 636{ 637 // Letting the simulated program change the simulator's umask seems like 638 // a bad idea. Compromise by just returning the current umask but not 639 // changing anything. 640 mode_t oldMask = umask(0); 641 umask(oldMask); 642 return (int)oldMask; 643} 644 645SyscallReturn 646chownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 647{ 648 string path; 649 650 int index = 0; 651 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 652 return -EFAULT; 653 654 /* XXX endianess */ 655 uint32_t owner = p->getSyscallArg(tc, index); 656 uid_t hostOwner = owner; 657 uint32_t group = p->getSyscallArg(tc, index); 658 gid_t hostGroup = group; 659 660 // Adjust path for current working directory 661 path = p->fullPath(path); 662 663 int result = chown(path.c_str(), hostOwner, hostGroup); 664 return (result == -1) ? -errno : result; 665} 666 667SyscallReturn 668fchownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 669{ 670 int index = 0; 671 int tgt_fd = p->getSyscallArg(tc, index); 672 673 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 674 if (!ffdp) 675 return -EBADF; 676 int sim_fd = ffdp->getSimFD(); 677 678 /* XXX endianess */ 679 uint32_t owner = p->getSyscallArg(tc, index); 680 uid_t hostOwner = owner; 681 uint32_t group = p->getSyscallArg(tc, index); 682 gid_t hostGroup = group; 683 684 int result = fchown(sim_fd, hostOwner, hostGroup); 685 return (result == -1) ? -errno : result; 686} 687 688/** 689 * FIXME: The file description is not shared among file descriptors created 690 * with dup. Really, it's difficult to maintain fields like file offset or 691 * flags since an update to such a field won't be reflected in the metadata 692 * for the fd entries that we maintain for checkpoint restoration. 693 */ 694SyscallReturn 695dupFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 696{ 697 int index = 0; 698 int tgt_fd = p->getSyscallArg(tc, index); 699 700 auto old_hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 701 if (!old_hbfdp) 702 return -EBADF; 703 int sim_fd = old_hbfdp->getSimFD(); 704 705 int result = dup(sim_fd); 706 if (result == -1) 707 return -errno; 708 709 auto new_hbfdp = std::dynamic_pointer_cast<HBFDEntry>(old_hbfdp->clone()); 710 new_hbfdp->setSimFD(result); 711 new_hbfdp->setCOE(false); 712 return p->fds->allocFD(new_hbfdp); 713} 714 715SyscallReturn 716dup2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 717{ 718 int index = 0; 719 720 int old_tgt_fd = p->getSyscallArg(tc, index); 721 auto old_hbp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[old_tgt_fd]); 722 if (!old_hbp) 723 return -EBADF; 724 int old_sim_fd = old_hbp->getSimFD(); 725 726 /** 727 * We need a valid host file descriptor number to be able to pass into 728 * the second parameter for dup2 (newfd), but we don't know what the 729 * viable numbers are; we execute the open call to retrieve one. 730 */ 731 int res_fd = dup2(old_sim_fd, open("/dev/null", O_RDONLY)); 732 if (res_fd == -1) 733 return -errno; 734 735 int new_tgt_fd = p->getSyscallArg(tc, index); 736 auto new_hbp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[new_tgt_fd]); 737 if (new_hbp) 738 p->fds->closeFDEntry(new_tgt_fd); 739 new_hbp = std::dynamic_pointer_cast<HBFDEntry>(old_hbp->clone()); 740 new_hbp->setSimFD(res_fd); 741 new_hbp->setCOE(false); 742 743 return p->fds->allocFD(new_hbp); 744} 745 746SyscallReturn 747fcntlFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 748{ 749 int arg; 750 int index = 0; 751 int tgt_fd = p->getSyscallArg(tc, index); 752 int cmd = p->getSyscallArg(tc, index); 753 754 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 755 if (!hbfdp) 756 return -EBADF; 757 int sim_fd = hbfdp->getSimFD(); 758 759 int coe = hbfdp->getCOE(); 760 761 switch (cmd) { 762 case F_GETFD: 763 return coe & FD_CLOEXEC; 764 765 case F_SETFD: { 766 arg = p->getSyscallArg(tc, index); 767 arg ? hbfdp->setCOE(true) : hbfdp->setCOE(false); 768 return 0; 769 } 770 771 // Rely on the host to maintain the file status flags for this file 772 // description rather than maintain it ourselves. Admittedly, this 773 // is suboptimal (and possibly error prone), but it is difficult to 774 // maintain the flags by tracking them across the different descriptors 775 // (that refer to this file description) caused by clone, dup, and 776 // subsequent fcntls. 777 case F_GETFL: 778 case F_SETFL: { 779 arg = p->getSyscallArg(tc, index); 780 int rv = fcntl(sim_fd, cmd, arg); 781 return (rv == -1) ? -errno : rv; 782 } 783 784 default: 785 warn("fcntl: unsupported command %d\n", cmd); 786 return 0; 787 } 788} 789 790SyscallReturn 791fcntl64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 792{ 793 int index = 0; 794 int tgt_fd = p->getSyscallArg(tc, index); 795 796 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 797 if (!hbfdp) 798 return -EBADF; 799 int sim_fd = hbfdp->getSimFD(); 800 801 int cmd = p->getSyscallArg(tc, index); 802 switch (cmd) { 803 case 33: //F_GETLK64 804 warn("fcntl64(%d, F_GETLK64) not supported, error returned\n", tgt_fd); 805 return -EMFILE; 806 807 case 34: // F_SETLK64 808 case 35: // F_SETLKW64 809 warn("fcntl64(%d, F_SETLK(W)64) not supported, error returned\n", 810 tgt_fd); 811 return -EMFILE; 812 813 default: 814 // not sure if this is totally valid, but we'll pass it through 815 // to the underlying OS 816 warn("fcntl64(%d, %d) passed through to host\n", tgt_fd, cmd); 817 return fcntl(sim_fd, cmd); 818 } 819} 820 821SyscallReturn 822pipeImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 823 bool pseudoPipe) 824{ 825 Addr tgt_addr = 0; 826 if (!pseudoPipe) { 827 int index = 0; 828 tgt_addr = p->getSyscallArg(tc, index); 829 } 830 831 int sim_fds[2], tgt_fds[2]; 832 833 int pipe_retval = pipe(sim_fds); 834 if (pipe_retval == -1) 835 return -errno; 836 837 auto rend = PipeFDEntry::EndType::read; 838 auto rpfd = std::make_shared<PipeFDEntry>(sim_fds[0], O_WRONLY, rend); 839 tgt_fds[0] = p->fds->allocFD(rpfd); 840 841 auto wend = PipeFDEntry::EndType::write; 842 auto wpfd = std::make_shared<PipeFDEntry>(sim_fds[1], O_RDONLY, wend); 843 tgt_fds[1] = p->fds->allocFD(wpfd); 844 845 /** 846 * Now patch the read object to record the target file descriptor chosen 847 * as the write end of the pipe. 848 */ 849 rpfd->setPipeReadSource(tgt_fds[1]); 850 851 /** 852 * Alpha Linux convention for pipe() is that fd[0] is returned as 853 * the return value of the function, and fd[1] is returned in r20. 854 */ 855 if (pseudoPipe) { 856 tc->setIntReg(SyscallPseudoReturnReg, tgt_fds[1]); 857 return tgt_fds[0]; 858 } 859 860 /** 861 * Copy the target file descriptors into buffer space and then copy 862 * the buffer space back into the target address space. 863 */ 864 BufferArg tgt_handle(tgt_addr, sizeof(int[2])); 865 int *buf_ptr = (int*)tgt_handle.bufferPtr(); 866 buf_ptr[0] = tgt_fds[0]; 867 buf_ptr[1] = tgt_fds[1]; 868 tgt_handle.copyOut(tc->getMemProxy()); 869 return 0; 870} 871 872SyscallReturn 873pipePseudoFunc(SyscallDesc *desc, int callnum, Process *process, 874 ThreadContext *tc) 875{ 876 return pipeImpl(desc, callnum, process, tc, true); 877} 878 879SyscallReturn 880pipeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 881{ 882 return pipeImpl(desc, callnum, process, tc, false); 883} 884 885SyscallReturn 886setpgidFunc(SyscallDesc *desc, int callnum, Process *process, 887 ThreadContext *tc) 888{ 889 int index = 0; 890 int pid = process->getSyscallArg(tc, index); 891 int pgid = process->getSyscallArg(tc, index); 892 893 if (pgid < 0) 894 return -EINVAL; 895 896 if (pid == 0) { 897 process->setpgid(process->pid()); 898 return 0; 899 } 900 901 Process *matched_ph = nullptr; 902 System *sysh = tc->getSystemPtr(); 903 904 // Retrieves process pointer from active/suspended thread contexts. 905 for (int i = 0; i < sysh->numContexts(); i++) { 906 if (sysh->threadContexts[i]->status() != ThreadContext::Halted) { 907 Process *temp_h = sysh->threadContexts[i]->getProcessPtr(); 908 Process *walk_ph = (Process*)temp_h; 909 910 if (walk_ph && walk_ph->pid() == process->pid()) 911 matched_ph = walk_ph; 912 } 913 } 914 915 assert(matched_ph); 916 matched_ph->setpgid((pgid == 0) ? matched_ph->pid() : pgid); 917 918 return 0; 919} 920 921SyscallReturn 922getpidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 923 ThreadContext *tc) 924{ 925 // Make up a PID. There's no interprocess communication in 926 // fake_syscall mode, so there's no way for a process to know it's 927 // not getting a unique value. 928 929 tc->setIntReg(SyscallPseudoReturnReg, process->ppid()); 930 return process->pid(); 931} 932 933 934SyscallReturn 935getuidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 936 ThreadContext *tc) 937{ 938 // Make up a UID and EUID... it shouldn't matter, and we want the 939 // simulation to be deterministic. 940 941 // EUID goes in r20. 942 tc->setIntReg(SyscallPseudoReturnReg, process->euid()); // EUID 943 return process->uid(); // UID 944} 945 946 947SyscallReturn 948getgidPseudoFunc(SyscallDesc *desc, int callnum, Process *process, 949 ThreadContext *tc) 950{ 951 // Get current group ID. EGID goes in r20. 952 tc->setIntReg(SyscallPseudoReturnReg, process->egid()); // EGID 953 return process->gid(); 954} 955 956 957SyscallReturn 958setuidFunc(SyscallDesc *desc, int callnum, Process *process, 959 ThreadContext *tc) 960{ 961 // can't fathom why a benchmark would call this. 962 int index = 0; 963 warn("Ignoring call to setuid(%d)\n", process->getSyscallArg(tc, index)); 964 return 0; 965} 966 967SyscallReturn 968getpidFunc(SyscallDesc *desc, int callnum, Process *process, 969 ThreadContext *tc) 970{ 971 return process->tgid(); 972} 973 974SyscallReturn 975gettidFunc(SyscallDesc *desc, int callnum, Process *process, 976 ThreadContext *tc) 977{ 978 return process->pid(); 979} 980 981SyscallReturn 982getppidFunc(SyscallDesc *desc, int callnum, Process *process, 983 ThreadContext *tc) 984{ 985 return process->ppid(); 986} 987 988SyscallReturn 989getuidFunc(SyscallDesc *desc, int callnum, Process *process, 990 ThreadContext *tc) 991{ 992 return process->uid(); // UID 993} 994 995SyscallReturn 996geteuidFunc(SyscallDesc *desc, int callnum, Process *process, 997 ThreadContext *tc) 998{ 999 return process->euid(); // UID 1000} 1001 1002SyscallReturn 1003getgidFunc(SyscallDesc *desc, int callnum, Process *process, 1004 ThreadContext *tc) 1005{ 1006 return process->gid(); 1007} 1008 1009SyscallReturn 1010getegidFunc(SyscallDesc *desc, int callnum, Process *process, 1011 ThreadContext *tc) 1012{ 1013 return process->egid(); 1014} 1015 1016SyscallReturn 1017fallocateFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1018{ 1019#if NO_FALLOCATE 1020 warn("Host OS cannot support calls to fallocate. Ignoring syscall"); 1021#else 1022 int index = 0; 1023 int tgt_fd = p->getSyscallArg(tc, index); 1024 int mode = p->getSyscallArg(tc, index); 1025 off_t offset = p->getSyscallArg(tc, index); 1026 off_t len = p->getSyscallArg(tc, index); 1027 1028 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1029 if (!ffdp) 1030 return -EBADF; 1031 int sim_fd = ffdp->getSimFD(); 1032 1033 int result = fallocate(sim_fd, mode, offset, len); 1034 if (result < 0) 1035 return -errno; 1036#endif 1037 return 0; 1038} 1039 1040SyscallReturn 1041accessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 1042 int index) 1043{ 1044 string path; 1045 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 1046 return -EFAULT; 1047 1048 // Adjust path for current working directory 1049 path = p->fullPath(path); 1050 1051 mode_t mode = p->getSyscallArg(tc, index); 1052 1053 int result = access(path.c_str(), mode); 1054 return (result == -1) ? -errno : result; 1055} 1056 1057SyscallReturn 1058accessFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1059{ 1060 return accessFunc(desc, callnum, p, tc, 0); 1061} 1062 1063SyscallReturn 1064mknodFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1065{ 1066 int index = 0; 1067 std::string path; 1068 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 1069 return -EFAULT; 1070 1071 path = p->fullPath(path); 1072 mode_t mode = p->getSyscallArg(tc, index); 1073 dev_t dev = p->getSyscallArg(tc, index); 1074 1075 auto result = mknod(path.c_str(), mode, dev); 1076 return (result == -1) ? -errno : result; 1077} 1078 1079SyscallReturn 1080chdirFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1081{ 1082 int index = 0; 1083 std::string path; 1084 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 1085 return -EFAULT; 1086 1087 path = p->fullPath(path); 1088 1089 auto result = chdir(path.c_str()); 1090 return (result == -1) ? -errno : result; 1091} 1092 1093SyscallReturn 1094rmdirFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1095{ 1096 int index = 0; 1097 std::string path; 1098 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 1099 return -EFAULT; 1100 1101 path = p->fullPath(path); 1102 1103 auto result = rmdir(path.c_str()); 1104 return (result == -1) ? -errno : result; 1105} 1106 1107#if defined(SYS_getdents) || defined(SYS_getdents64) 1108template<typename DE, int SYS_NUM> 1109static SyscallReturn 1110getdentsImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1111{ 1112 int index = 0; 1113 int tgt_fd = p->getSyscallArg(tc, index); 1114 Addr buf_ptr = p->getSyscallArg(tc, index); 1115 unsigned count = p->getSyscallArg(tc, index); 1116 1117 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 1118 if (!hbfdp) 1119 return -EBADF; 1120 int sim_fd = hbfdp->getSimFD(); 1121 1122 BufferArg buf_arg(buf_ptr, count); 1123 auto status = syscall(SYS_NUM, sim_fd, buf_arg.bufferPtr(), count); 1124 1125 if (status == -1) 1126 return -errno; 1127 1128 unsigned traversed = 0; 1129 while (traversed < status) { 1130 DE *buffer = (DE*)((Addr)buf_arg.bufferPtr() + traversed); 1131 1132 auto host_reclen = buffer->d_reclen; 1133 1134 /** 1135 * Convert the byte ordering from the host to the target before 1136 * passing the data back into the target's address space to preserve 1137 * endianness. 1138 */ 1139 buffer->d_ino = htog(buffer->d_ino); 1140 buffer->d_off = htog(buffer->d_off); 1141 buffer->d_reclen = htog(buffer->d_reclen); 1142 1143 traversed += host_reclen; 1144 } 1145 1146 buf_arg.copyOut(tc->getMemProxy()); 1147 return status; 1148} 1149#endif 1150 1151#if defined(SYS_getdents) 1152SyscallReturn 1153getdentsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1154{ 1155 typedef struct linux_dirent { 1156 unsigned long d_ino; 1157 unsigned long d_off; 1158 unsigned short d_reclen; 1159 char dname[]; 1160 } LinDent; 1161 1162 return getdentsImpl<LinDent, SYS_getdents>(desc, callnum, p, tc); 1163} 1164#endif 1165 1166#if defined(SYS_getdents64) 1167SyscallReturn 1168getdents64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1169{ 1170 typedef struct linux_dirent64 { 1171 ino64_t d_ino; 1172 off64_t d_off; 1173 unsigned short d_reclen; 1174 char dname[]; 1175 } LinDent64; 1176 1177 return getdentsImpl<LinDent64, SYS_getdents64>(desc, callnum, p, tc); 1178} 1179#endif 1180 1181SyscallReturn 1182shutdownFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1183{ 1184 int index = 0; 1185 int tgt_fd = p->getSyscallArg(tc, index); 1186 int how = p->getSyscallArg(tc, index); 1187 1188 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1189 if (!sfdp) 1190 return -EBADF; 1191 int sim_fd = sfdp->getSimFD(); 1192 1193 int retval = shutdown(sim_fd, how); 1194 1195 return (retval == -1) ? -errno : retval; 1196} 1197 1198SyscallReturn 1199bindFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1200{ 1201 int index = 0; 1202 int tgt_fd = p->getSyscallArg(tc, index); 1203 Addr buf_ptr = p->getSyscallArg(tc, index); 1204 int addrlen = p->getSyscallArg(tc, index); 1205 1206 BufferArg bufSock(buf_ptr, addrlen); 1207 bufSock.copyIn(tc->getMemProxy()); 1208 1209 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1210 if (!sfdp) 1211 return -EBADF; 1212 int sim_fd = sfdp->getSimFD(); 1213 1214 int status = ::bind(sim_fd, 1215 (struct sockaddr *)bufSock.bufferPtr(), 1216 addrlen); 1217 1218 return (status == -1) ? -errno : status; 1219} 1220 1221SyscallReturn 1222listenFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1223{ 1224 int index = 0; 1225 int tgt_fd = p->getSyscallArg(tc, index); 1226 int backlog = p->getSyscallArg(tc, index); 1227 1228 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1229 if (!sfdp) 1230 return -EBADF; 1231 int sim_fd = sfdp->getSimFD(); 1232 1233 int status = listen(sim_fd, backlog); 1234 1235 return (status == -1) ? -errno : status; 1236} 1237 1238SyscallReturn 1239connectFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1240{ 1241 int index = 0; 1242 int tgt_fd = p->getSyscallArg(tc, index); 1243 Addr buf_ptr = p->getSyscallArg(tc, index); 1244 int addrlen = p->getSyscallArg(tc, index); 1245 1246 BufferArg addr(buf_ptr, addrlen); 1247 addr.copyIn(tc->getMemProxy()); 1248 1249 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1250 if (!sfdp) 1251 return -EBADF; 1252 int sim_fd = sfdp->getSimFD(); 1253 1254 int status = connect(sim_fd, 1255 (struct sockaddr *)addr.bufferPtr(), 1256 (socklen_t)addrlen); 1257 1258 return (status == -1) ? -errno : status; 1259} 1260 1261SyscallReturn 1262recvfromFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1263{ 1264 int index = 0; 1265 int tgt_fd = p->getSyscallArg(tc, index); 1266 Addr bufrPtr = p->getSyscallArg(tc, index); 1267 size_t bufrLen = p->getSyscallArg(tc, index); 1268 int flags = p->getSyscallArg(tc, index); 1269 Addr addrPtr = p->getSyscallArg(tc, index); 1270 Addr addrlenPtr = p->getSyscallArg(tc, index); 1271 1272 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1273 if (!sfdp) 1274 return -EBADF; 1275 int sim_fd = sfdp->getSimFD(); 1276 1277 // Reserve buffer space. 1278 BufferArg bufrBuf(bufrPtr, bufrLen); 1279 1280 // Get address length. 1281 socklen_t addrLen = 0; 1282 if (addrlenPtr != 0) { 1283 // Read address length parameter. 1284 BufferArg addrlenBuf(addrlenPtr, sizeof(socklen_t)); 1285 addrlenBuf.copyIn(tc->getMemProxy()); 1286 addrLen = *((socklen_t *)addrlenBuf.bufferPtr()); 1287 } 1288 1289 struct sockaddr sa, *sap = NULL; 1290 if (addrLen != 0) { 1291 BufferArg addrBuf(addrPtr, addrLen); 1292 addrBuf.copyIn(tc->getMemProxy()); 1293 memcpy(&sa, (struct sockaddr *)addrBuf.bufferPtr(), 1294 sizeof(struct sockaddr)); 1295 sap = &sa; 1296 } 1297 1298 ssize_t recvd_size = recvfrom(sim_fd, 1299 (void *)bufrBuf.bufferPtr(), 1300 bufrLen, flags, sap, (socklen_t *)&addrLen); 1301 1302 if (recvd_size == -1) 1303 return -errno; 1304 1305 // Pass the received data out. 1306 bufrBuf.copyOut(tc->getMemProxy()); 1307 1308 // Copy address to addrPtr and pass it on. 1309 if (sap != NULL) { 1310 BufferArg addrBuf(addrPtr, addrLen); 1311 memcpy(addrBuf.bufferPtr(), sap, sizeof(sa)); 1312 addrBuf.copyOut(tc->getMemProxy()); 1313 } 1314 1315 // Copy len to addrlenPtr and pass it on. 1316 if (addrLen != 0) { 1317 BufferArg addrlenBuf(addrlenPtr, sizeof(socklen_t)); 1318 *(socklen_t *)addrlenBuf.bufferPtr() = addrLen; 1319 addrlenBuf.copyOut(tc->getMemProxy()); 1320 } 1321 1322 return recvd_size; 1323} 1324 1325SyscallReturn 1326sendtoFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1327{ 1328 int index = 0; 1329 int tgt_fd = p->getSyscallArg(tc, index); 1330 Addr bufrPtr = p->getSyscallArg(tc, index); 1331 size_t bufrLen = p->getSyscallArg(tc, index); 1332 int flags = p->getSyscallArg(tc, index); 1333 Addr addrPtr = p->getSyscallArg(tc, index); 1334 socklen_t addrLen = p->getSyscallArg(tc, index); 1335 1336 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1337 if (!sfdp) 1338 return -EBADF; 1339 int sim_fd = sfdp->getSimFD(); 1340 1341 // Reserve buffer space. 1342 BufferArg bufrBuf(bufrPtr, bufrLen); 1343 bufrBuf.copyIn(tc->getMemProxy()); 1344 1345 struct sockaddr sa, *sap = nullptr; 1346 memset(&sa, 0, sizeof(sockaddr)); 1347 if (addrLen != 0) { 1348 BufferArg addrBuf(addrPtr, addrLen); 1349 addrBuf.copyIn(tc->getMemProxy()); 1350 memcpy(&sa, (sockaddr*)addrBuf.bufferPtr(), addrLen); 1351 sap = &sa; 1352 } 1353 1354 ssize_t sent_size = sendto(sim_fd, 1355 (void *)bufrBuf.bufferPtr(), 1356 bufrLen, flags, sap, (socklen_t)addrLen); 1357 1358 return (sent_size == -1) ? -errno : sent_size; 1359} 1360 1361SyscallReturn 1362recvmsgFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1363{ 1364 int index = 0; 1365 int tgt_fd = p->getSyscallArg(tc, index); 1366 Addr msgPtr = p->getSyscallArg(tc, index); 1367 int flags = p->getSyscallArg(tc, index); 1368 1369 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1370 if (!sfdp) 1371 return -EBADF; 1372 int sim_fd = sfdp->getSimFD(); 1373 1374 /** 1375 * struct msghdr { 1376 * void *msg_name; // optional address 1377 * socklen_t msg_namelen; // size of address 1378 * struct iovec *msg_iov; // iovec array 1379 * size_t msg_iovlen; // number entries in msg_iov 1380 * i // entries correspond to buffer 1381 * void *msg_control; // ancillary data 1382 * size_t msg_controllen; // ancillary data buffer len 1383 * int msg_flags; // flags on received message 1384 * }; 1385 * 1386 * struct iovec { 1387 * void *iov_base; // starting address 1388 * size_t iov_len; // number of bytes to transfer 1389 * }; 1390 */ 1391 1392 /** 1393 * The plan with this system call is to replace all of the pointers in the 1394 * structure and the substructure with BufferArg class pointers. We will 1395 * copy every field from the structures into our BufferArg classes. 1396 */ 1397 BufferArg msgBuf(msgPtr, sizeof(struct msghdr)); 1398 msgBuf.copyIn(tc->getMemProxy()); 1399 struct msghdr *msgHdr = (struct msghdr *)msgBuf.bufferPtr(); 1400 1401 /** 1402 * We will use these address place holders to retain the pointers which 1403 * we are going to replace with our own buffers in our simulator address 1404 * space. 1405 */ 1406 Addr msg_name_phold = 0; 1407 Addr msg_iov_phold = 0; 1408 Addr iovec_base_phold[msgHdr->msg_iovlen]; 1409 Addr msg_control_phold = 0; 1410 1411 /** 1412 * Record msg_name pointer then replace with buffer pointer. 1413 */ 1414 BufferArg *nameBuf = NULL; 1415 if (msgHdr->msg_name) { 1416 /*1*/msg_name_phold = (Addr)msgHdr->msg_name; 1417 /*2*/nameBuf = new BufferArg(msg_name_phold, msgHdr->msg_namelen); 1418 /*3*/nameBuf->copyIn(tc->getMemProxy()); 1419 /*4*/msgHdr->msg_name = nameBuf->bufferPtr(); 1420 } 1421 1422 /** 1423 * Record msg_iov pointer then replace with buffer pointer. Also, setup 1424 * an array of buffer pointers for the iovec structs record and replace 1425 * their pointers with buffer pointers. 1426 */ 1427 BufferArg *iovBuf = NULL; 1428 BufferArg *iovecBuf[msgHdr->msg_iovlen]; 1429 for (int i = 0; i < msgHdr->msg_iovlen; i++) { 1430 iovec_base_phold[i] = 0; 1431 iovecBuf[i] = NULL; 1432 } 1433 1434 if (msgHdr->msg_iov) { 1435 /*1*/msg_iov_phold = (Addr)msgHdr->msg_iov; 1436 /*2*/iovBuf = new BufferArg(msg_iov_phold, msgHdr->msg_iovlen * 1437 sizeof(struct iovec)); 1438 /*3*/iovBuf->copyIn(tc->getMemProxy()); 1439 for (int i = 0; i < msgHdr->msg_iovlen; i++) { 1440 if (((struct iovec *)iovBuf->bufferPtr())[i].iov_base) { 1441 /*1*/iovec_base_phold[i] = 1442 (Addr)((struct iovec *)iovBuf->bufferPtr())[i].iov_base; 1443 /*2*/iovecBuf[i] = new BufferArg(iovec_base_phold[i], 1444 ((struct iovec *)iovBuf->bufferPtr())[i].iov_len); 1445 /*3*/iovecBuf[i]->copyIn(tc->getMemProxy()); 1446 /*4*/((struct iovec *)iovBuf->bufferPtr())[i].iov_base = 1447 iovecBuf[i]->bufferPtr(); 1448 } 1449 } 1450 /*4*/msgHdr->msg_iov = (struct iovec *)iovBuf->bufferPtr(); 1451 } 1452 1453 /** 1454 * Record msg_control pointer then replace with buffer pointer. 1455 */ 1456 BufferArg *controlBuf = NULL; 1457 if (msgHdr->msg_control) { 1458 /*1*/msg_control_phold = (Addr)msgHdr->msg_control; 1459 /*2*/controlBuf = new BufferArg(msg_control_phold, 1460 CMSG_ALIGN(msgHdr->msg_controllen)); 1461 /*3*/controlBuf->copyIn(tc->getMemProxy()); 1462 /*4*/msgHdr->msg_control = controlBuf->bufferPtr(); 1463 } 1464 1465 ssize_t recvd_size = recvmsg(sim_fd, msgHdr, flags); 1466 1467 if (recvd_size < 0) 1468 return -errno; 1469 1470 if (msgHdr->msg_name) { 1471 nameBuf->copyOut(tc->getMemProxy()); 1472 delete(nameBuf); 1473 msgHdr->msg_name = (void *)msg_name_phold; 1474 } 1475 1476 if (msgHdr->msg_iov) { 1477 for (int i = 0; i< msgHdr->msg_iovlen; i++) { 1478 if (((struct iovec *)iovBuf->bufferPtr())[i].iov_base) { 1479 iovecBuf[i]->copyOut(tc->getMemProxy()); 1480 delete iovecBuf[i]; 1481 ((struct iovec *)iovBuf->bufferPtr())[i].iov_base = 1482 (void *)iovec_base_phold[i]; 1483 } 1484 } 1485 iovBuf->copyOut(tc->getMemProxy()); 1486 delete iovBuf; 1487 msgHdr->msg_iov = (struct iovec *)msg_iov_phold; 1488 } 1489 1490 if (msgHdr->msg_control) { 1491 controlBuf->copyOut(tc->getMemProxy()); 1492 delete(controlBuf); 1493 msgHdr->msg_control = (void *)msg_control_phold; 1494 } 1495 1496 msgBuf.copyOut(tc->getMemProxy()); 1497 1498 return recvd_size; 1499} 1500 1501SyscallReturn 1502sendmsgFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1503{ 1504 int index = 0; 1505 int tgt_fd = p->getSyscallArg(tc, index); 1506 Addr msgPtr = p->getSyscallArg(tc, index); 1507 int flags = p->getSyscallArg(tc, index); 1508 1509 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1510 if (!sfdp) 1511 return -EBADF; 1512 int sim_fd = sfdp->getSimFD(); 1513 1514 /** 1515 * Reserve buffer space. 1516 */ 1517 BufferArg msgBuf(msgPtr, sizeof(struct msghdr)); 1518 msgBuf.copyIn(tc->getMemProxy()); 1519 struct msghdr msgHdr = *((struct msghdr *)msgBuf.bufferPtr()); 1520 1521 /** 1522 * Assuming msgHdr.msg_iovlen >= 1, then there is no point calling 1523 * recvmsg without a buffer. 1524 */ 1525 struct iovec *iovPtr = msgHdr.msg_iov; 1526 BufferArg iovBuf((Addr)iovPtr, sizeof(struct iovec) * msgHdr.msg_iovlen); 1527 iovBuf.copyIn(tc->getMemProxy()); 1528 struct iovec *iov = (struct iovec *)iovBuf.bufferPtr(); 1529 msgHdr.msg_iov = iov; 1530 1531 /** 1532 * Cannot instantiate buffers till inside the loop. 1533 * Create array to hold buffer addresses, to be used during copyIn of 1534 * send data. 1535 */ 1536 BufferArg **bufferArray = (BufferArg **)malloc(msgHdr.msg_iovlen 1537 * sizeof(BufferArg *)); 1538 1539 /** 1540 * Iterate through the iovec structures: 1541 * Get the base buffer addreses, reserve iov_len amount of space for each. 1542 * Put the buf address into the bufferArray for later retrieval. 1543 */ 1544 for (int iovIndex = 0 ; iovIndex < msgHdr.msg_iovlen; iovIndex++) { 1545 Addr basePtr = (Addr) iov[iovIndex].iov_base; 1546 bufferArray[iovIndex] = new BufferArg(basePtr, iov[iovIndex].iov_len); 1547 bufferArray[iovIndex]->copyIn(tc->getMemProxy()); 1548 iov[iovIndex].iov_base = bufferArray[iovIndex]->bufferPtr(); 1549 } 1550 1551 ssize_t sent_size = sendmsg(sim_fd, &msgHdr, flags); 1552 int local_errno = errno; 1553 1554 /** 1555 * Free dynamically allocated memory. 1556 */ 1557 for (int iovIndex = 0 ; iovIndex < msgHdr.msg_iovlen; iovIndex++) { 1558 BufferArg *baseBuf = ( BufferArg *)bufferArray[iovIndex]; 1559 delete(baseBuf); 1560 } 1561 1562 /** 1563 * Malloced above. 1564 */ 1565 free(bufferArray); 1566 1567 return (sent_size < 0) ? -local_errno : sent_size; 1568} 1569 1570SyscallReturn 1571getsockoptFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1572{ 1573 // union of all possible return value types from getsockopt 1574 union val { 1575 int i_val; 1576 long l_val; 1577 struct linger linger_val; 1578 struct timeval timeval_val; 1579 } val; 1580 1581 int index = 0; 1582 int tgt_fd = p->getSyscallArg(tc, index); 1583 int level = p->getSyscallArg(tc, index); 1584 int optname = p->getSyscallArg(tc, index); 1585 Addr valPtr = p->getSyscallArg(tc, index); 1586 Addr lenPtr = p->getSyscallArg(tc, index); 1587 1588 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1589 if (!sfdp) 1590 return -EBADF; 1591 int sim_fd = sfdp->getSimFD(); 1592 1593 socklen_t len = sizeof(val); 1594 int status = getsockopt(sim_fd, level, optname, &val, &len); 1595 1596 if (status == -1) 1597 return -errno; 1598 1599 // copy val to valPtr and pass it on 1600 BufferArg valBuf(valPtr, sizeof(val)); 1601 memcpy(valBuf.bufferPtr(), &val, sizeof(val)); 1602 valBuf.copyOut(tc->getMemProxy()); 1603 1604 // copy len to lenPtr and pass it on 1605 BufferArg lenBuf(lenPtr, sizeof(len)); 1606 memcpy(lenBuf.bufferPtr(), &len, sizeof(len)); 1607 lenBuf.copyOut(tc->getMemProxy()); 1608 1609 return status; 1610} 1611 1612SyscallReturn 1613getsocknameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1614{ 1615 int index = 0; 1616 int tgt_fd = p->getSyscallArg(tc, index); 1617 Addr addrPtr = p->getSyscallArg(tc, index); 1618 Addr lenPtr = p->getSyscallArg(tc, index); 1619 1620 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1621 if (!sfdp) 1622 return -EBADF; 1623 int sim_fd = sfdp->getSimFD(); 1624 1625 // lenPtr is an in-out paramenter: 1626 // sending the address length in, conveying the final length out 1627 1628 // Read in the value of len from the passed pointer. 1629 BufferArg lenBuf(lenPtr, sizeof(socklen_t)); 1630 lenBuf.copyIn(tc->getMemProxy()); 1631 socklen_t len = *(socklen_t *)lenBuf.bufferPtr(); 1632 1633 struct sockaddr sa; 1634 int status = getsockname(sim_fd, &sa, &len); 1635 1636 if (status == -1) 1637 return -errno; 1638 1639 // Copy address to addrPtr and pass it on. 1640 BufferArg addrBuf(addrPtr, sizeof(sa)); 1641 memcpy(addrBuf.bufferPtr(), &sa, sizeof(sa)); 1642 addrBuf.copyOut(tc->getMemProxy()); 1643 1644 // Copy len to lenPtr and pass it on. 1645 *(socklen_t *)lenBuf.bufferPtr() = len; 1646 lenBuf.copyOut(tc->getMemProxy()); 1647 1648 return status; 1649} 1650 1651SyscallReturn 1652getpeernameFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1653{ 1654 int index = 0; 1655 int tgt_fd = p->getSyscallArg(tc, index); 1656 Addr sockAddrPtr = p->getSyscallArg(tc, index); 1657 Addr addrlenPtr = p->getSyscallArg(tc, index); 1658 1659 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1660 if (!sfdp) 1661 return -EBADF; 1662 int sim_fd = sfdp->getSimFD(); 1663 1664 BufferArg bufAddrlen(addrlenPtr, sizeof(unsigned)); 1665 bufAddrlen.copyIn(tc->getMemProxy()); 1666 BufferArg bufSock(sockAddrPtr, *(unsigned *)bufAddrlen.bufferPtr()); 1667 1668 int retval = getpeername(sim_fd, 1669 (struct sockaddr *)bufSock.bufferPtr(), 1670 (unsigned *)bufAddrlen.bufferPtr()); 1671 1672 if (retval != -1) { 1673 bufSock.copyOut(tc->getMemProxy()); 1674 bufAddrlen.copyOut(tc->getMemProxy()); 1675 } 1676 1677 return (retval == -1) ? -errno : retval; 1678} 1679 1680SyscallReturn 1681setsockoptFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1682{ 1683 int index = 0; 1684 int tgt_fd = p->getSyscallArg(tc, index); 1685 int level = p->getSyscallArg(tc, index); 1686 int optname = p->getSyscallArg(tc, index); 1687 Addr valPtr = p->getSyscallArg(tc, index); 1688 socklen_t len = p->getSyscallArg(tc, index); 1689 1690 BufferArg valBuf(valPtr, len); 1691 valBuf.copyIn(tc->getMemProxy()); 1692 1693 auto sfdp = std::dynamic_pointer_cast<SocketFDEntry>((*p->fds)[tgt_fd]); 1694 if (!sfdp) 1695 return -EBADF; 1696 int sim_fd = sfdp->getSimFD(); 1697 1698 int status = setsockopt(sim_fd, level, optname, 1699 (struct sockaddr *)valBuf.bufferPtr(), len); 1700 1701 return (status == -1) ? -errno : status; 1702} 1703 1704