syscall_emul.hh revision 12426
1/* 2 * Copyright (c) 2012-2013, 2015 ARM Limited 3 * Copyright (c) 2015 Advanced Micro Devices, Inc. 4 * All rights reserved 5 * 6 * The license below extends only to copyright in the software and shall 7 * not be construed as granting a license to any other intellectual 8 * property including but not limited to intellectual property relating 9 * to a hardware implementation of the functionality of the software 10 * licensed hereunder. You may use the software subject to the license 11 * terms below provided that you ensure that this notice is replicated 12 * unmodified and in its entirety in all distributions of the software, 13 * modified or unmodified, in source code or in binary form. 14 * 15 * Copyright (c) 2003-2005 The Regents of The University of Michigan 16 * All rights reserved. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions are 20 * met: redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer; 22 * redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution; 25 * neither the name of the copyright holders nor the names of its 26 * contributors may be used to endorse or promote products derived from 27 * this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Authors: Steve Reinhardt 42 * Kevin Lim 43 */ 44 45#ifndef __SIM_SYSCALL_EMUL_HH__ 46#define __SIM_SYSCALL_EMUL_HH__ 47 48#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 49 defined(__FreeBSD__) || defined(__CYGWIN__) || \ 50 defined(__NetBSD__)) 51#define NO_STAT64 1 52#else 53#define NO_STAT64 0 54#endif 55 56#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 57 defined(__FreeBSD__) || defined(__NetBSD__)) 58#define NO_STATFS 1 59#else 60#define NO_STATFS 0 61#endif 62 63#if (defined(__APPLE__) || defined(__OpenBSD__) || \ 64 defined(__FreeBSD__) || defined(__NetBSD__)) 65#define NO_FALLOCATE 1 66#else 67#define NO_FALLOCATE 0 68#endif 69 70/// 71/// @file syscall_emul.hh 72/// 73/// This file defines objects used to emulate syscalls from the target 74/// application on the host machine. 75 76#ifdef __CYGWIN32__ 77#include <sys/fcntl.h> 78 79#endif 80#include <fcntl.h> 81#include <sys/mman.h> 82#include <sys/stat.h> 83#if (NO_STATFS == 0) 84#include <sys/statfs.h> 85#else 86#include <sys/mount.h> 87#endif 88#include <sys/time.h> 89#include <sys/uio.h> 90#include <unistd.h> 91 92#include <cerrno> 93#include <memory> 94#include <string> 95 96#include "arch/utility.hh" 97#include "base/intmath.hh" 98#include "base/loader/object_file.hh" 99#include "base/logging.hh" 100#include "base/trace.hh" 101#include "base/types.hh" 102#include "config/the_isa.hh" 103#include "cpu/base.hh" 104#include "cpu/thread_context.hh" 105#include "mem/page_table.hh" 106#include "params/Process.hh" 107#include "sim/emul_driver.hh" 108#include "sim/futex_map.hh" 109#include "sim/process.hh" 110#include "sim/syscall_debug_macros.hh" 111#include "sim/syscall_desc.hh" 112#include "sim/syscall_emul_buf.hh" 113#include "sim/syscall_return.hh" 114 115////////////////////////////////////////////////////////////////////// 116// 117// The following emulation functions are generic enough that they 118// don't need to be recompiled for different emulated OS's. They are 119// defined in sim/syscall_emul.cc. 120// 121////////////////////////////////////////////////////////////////////// 122 123 124/// Handler for unimplemented syscalls that we haven't thought about. 125SyscallReturn unimplementedFunc(SyscallDesc *desc, int num, 126 Process *p, ThreadContext *tc); 127 128/// Handler for unimplemented syscalls that we never intend to 129/// implement (signal handling, etc.) and should not affect the correct 130/// behavior of the program. Print a warning only if the appropriate 131/// trace flag is enabled. Return success to the target program. 132SyscallReturn ignoreFunc(SyscallDesc *desc, int num, 133 Process *p, ThreadContext *tc); 134 135// Target fallocateFunc() handler. 136SyscallReturn fallocateFunc(SyscallDesc *desc, int num, 137 Process *p, ThreadContext *tc); 138 139/// Target exit() handler: terminate current context. 140SyscallReturn exitFunc(SyscallDesc *desc, int num, 141 Process *p, ThreadContext *tc); 142 143/// Target exit_group() handler: terminate simulation. (exit all threads) 144SyscallReturn exitGroupFunc(SyscallDesc *desc, int num, 145 Process *p, ThreadContext *tc); 146 147/// Target set_tid_address() handler. 148SyscallReturn setTidAddressFunc(SyscallDesc *desc, int num, 149 Process *p, ThreadContext *tc); 150 151/// Target getpagesize() handler. 152SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num, 153 Process *p, ThreadContext *tc); 154 155/// Target brk() handler: set brk address. 156SyscallReturn brkFunc(SyscallDesc *desc, int num, 157 Process *p, ThreadContext *tc); 158 159/// Target close() handler. 160SyscallReturn closeFunc(SyscallDesc *desc, int num, 161 Process *p, ThreadContext *tc); 162 163// Target read() handler. 164SyscallReturn readFunc(SyscallDesc *desc, int num, 165 Process *p, ThreadContext *tc); 166 167/// Target write() handler. 168SyscallReturn writeFunc(SyscallDesc *desc, int num, 169 Process *p, ThreadContext *tc); 170 171/// Target lseek() handler. 172SyscallReturn lseekFunc(SyscallDesc *desc, int num, 173 Process *p, ThreadContext *tc); 174 175/// Target _llseek() handler. 176SyscallReturn _llseekFunc(SyscallDesc *desc, int num, 177 Process *p, ThreadContext *tc); 178 179/// Target munmap() handler. 180SyscallReturn munmapFunc(SyscallDesc *desc, int num, 181 Process *p, ThreadContext *tc); 182 183/// Target gethostname() handler. 184SyscallReturn gethostnameFunc(SyscallDesc *desc, int num, 185 Process *p, ThreadContext *tc); 186 187/// Target getcwd() handler. 188SyscallReturn getcwdFunc(SyscallDesc *desc, int num, 189 Process *p, ThreadContext *tc); 190 191/// Target readlink() handler. 192SyscallReturn readlinkFunc(SyscallDesc *desc, int num, 193 Process *p, ThreadContext *tc, 194 int index = 0); 195SyscallReturn readlinkFunc(SyscallDesc *desc, int num, 196 Process *p, ThreadContext *tc); 197 198/// Target unlink() handler. 199SyscallReturn unlinkHelper(SyscallDesc *desc, int num, 200 Process *p, ThreadContext *tc, 201 int index); 202SyscallReturn unlinkFunc(SyscallDesc *desc, int num, 203 Process *p, ThreadContext *tc); 204 205/// Target mkdir() handler. 206SyscallReturn mkdirFunc(SyscallDesc *desc, int num, 207 Process *p, ThreadContext *tc); 208 209/// Target rename() handler. 210SyscallReturn renameFunc(SyscallDesc *desc, int num, 211 Process *p, ThreadContext *tc); 212 213 214/// Target truncate() handler. 215SyscallReturn truncateFunc(SyscallDesc *desc, int num, 216 Process *p, ThreadContext *tc); 217 218 219/// Target ftruncate() handler. 220SyscallReturn ftruncateFunc(SyscallDesc *desc, int num, 221 Process *p, ThreadContext *tc); 222 223 224/// Target truncate64() handler. 225SyscallReturn truncate64Func(SyscallDesc *desc, int num, 226 Process *p, ThreadContext *tc); 227 228/// Target ftruncate64() handler. 229SyscallReturn ftruncate64Func(SyscallDesc *desc, int num, 230 Process *p, ThreadContext *tc); 231 232 233/// Target umask() handler. 234SyscallReturn umaskFunc(SyscallDesc *desc, int num, 235 Process *p, ThreadContext *tc); 236 237/// Target gettid() handler. 238SyscallReturn gettidFunc(SyscallDesc *desc, int num, 239 Process *p, ThreadContext *tc); 240 241/// Target chown() handler. 242SyscallReturn chownFunc(SyscallDesc *desc, int num, 243 Process *p, ThreadContext *tc); 244 245/// Target setpgid() handler. 246SyscallReturn setpgidFunc(SyscallDesc *desc, int num, 247 Process *p, ThreadContext *tc); 248 249/// Target fchown() handler. 250SyscallReturn fchownFunc(SyscallDesc *desc, int num, 251 Process *p, ThreadContext *tc); 252 253/// Target dup() handler. 254SyscallReturn dupFunc(SyscallDesc *desc, int num, 255 Process *process, ThreadContext *tc); 256 257/// Target dup2() handler. 258SyscallReturn dup2Func(SyscallDesc *desc, int num, 259 Process *process, ThreadContext *tc); 260 261/// Target fcntl() handler. 262SyscallReturn fcntlFunc(SyscallDesc *desc, int num, 263 Process *process, ThreadContext *tc); 264 265/// Target fcntl64() handler. 266SyscallReturn fcntl64Func(SyscallDesc *desc, int num, 267 Process *process, ThreadContext *tc); 268 269/// Target setuid() handler. 270SyscallReturn setuidFunc(SyscallDesc *desc, int num, 271 Process *p, ThreadContext *tc); 272 273/// Target pipe() handler. 274SyscallReturn pipeFunc(SyscallDesc *desc, int num, 275 Process *p, ThreadContext *tc); 276 277/// Internal pipe() handler. 278SyscallReturn pipeImpl(SyscallDesc *desc, int num, Process *p, 279 ThreadContext *tc, bool pseudoPipe); 280 281/// Target getpid() handler. 282SyscallReturn getpidFunc(SyscallDesc *desc, int num, 283 Process *p, ThreadContext *tc); 284 285/// Target getuid() handler. 286SyscallReturn getuidFunc(SyscallDesc *desc, int num, 287 Process *p, ThreadContext *tc); 288 289/// Target getgid() handler. 290SyscallReturn getgidFunc(SyscallDesc *desc, int num, 291 Process *p, ThreadContext *tc); 292 293/// Target getppid() handler. 294SyscallReturn getppidFunc(SyscallDesc *desc, int num, 295 Process *p, ThreadContext *tc); 296 297/// Target geteuid() handler. 298SyscallReturn geteuidFunc(SyscallDesc *desc, int num, 299 Process *p, ThreadContext *tc); 300 301/// Target getegid() handler. 302SyscallReturn getegidFunc(SyscallDesc *desc, int num, 303 Process *p, ThreadContext *tc); 304 305/// Target access() handler 306SyscallReturn accessFunc(SyscallDesc *desc, int num, 307 Process *p, ThreadContext *tc); 308SyscallReturn accessFunc(SyscallDesc *desc, int num, 309 Process *p, ThreadContext *tc, 310 int index); 311 312/// Futex system call 313/// Implemented by Daniel Sanchez 314/// Used by printf's in multi-threaded apps 315template <class OS> 316SyscallReturn 317futexFunc(SyscallDesc *desc, int callnum, Process *process, 318 ThreadContext *tc) 319{ 320 using namespace std; 321 322 int index = 0; 323 Addr uaddr = process->getSyscallArg(tc, index); 324 int op = process->getSyscallArg(tc, index); 325 int val = process->getSyscallArg(tc, index); 326 327 /* 328 * Unsupported option that does not affect the correctness of the 329 * application. This is a performance optimization utilized by Linux. 330 */ 331 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG; 332 333 FutexMap &futex_map = tc->getSystemPtr()->futexMap; 334 335 if (OS::TGT_FUTEX_WAIT == op) { 336 // Ensure futex system call accessed atomically. 337 BufferArg buf(uaddr, sizeof(int)); 338 buf.copyIn(tc->getMemProxy()); 339 int mem_val = *(int*)buf.bufferPtr(); 340 341 /* 342 * The value in memory at uaddr is not equal with the expected val 343 * (a different thread must have changed it before the system call was 344 * invoked). In this case, we need to throw an error. 345 */ 346 if (val != mem_val) 347 return -OS::TGT_EWOULDBLOCK; 348 349 futex_map.suspend(uaddr, process->tgid(), tc); 350 351 return 0; 352 } else if (OS::TGT_FUTEX_WAKE == op) { 353 return futex_map.wakeup(uaddr, process->tgid(), val); 354 } 355 356 warn("futex: op %d not implemented; ignoring.", op); 357 return -ENOSYS; 358} 359 360 361/// Pseudo Funcs - These functions use a different return convension, 362/// returning a second value in a register other than the normal return register 363SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, 364 Process *process, ThreadContext *tc); 365 366/// Target getpidPseudo() handler. 367SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, 368 Process *p, ThreadContext *tc); 369 370/// Target getuidPseudo() handler. 371SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, 372 Process *p, ThreadContext *tc); 373 374/// Target getgidPseudo() handler. 375SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, 376 Process *p, ThreadContext *tc); 377 378 379/// A readable name for 1,000,000, for converting microseconds to seconds. 380const int one_million = 1000000; 381/// A readable name for 1,000,000,000, for converting nanoseconds to seconds. 382const int one_billion = 1000000000; 383 384/// Approximate seconds since the epoch (1/1/1970). About a billion, 385/// by my reckoning. We want to keep this a constant (not use the 386/// real-world time) to keep simulations repeatable. 387const unsigned seconds_since_epoch = 1000000000; 388 389/// Helper function to convert current elapsed time to seconds and 390/// microseconds. 391template <class T1, class T2> 392void 393getElapsedTimeMicro(T1 &sec, T2 &usec) 394{ 395 uint64_t elapsed_usecs = curTick() / SimClock::Int::us; 396 sec = elapsed_usecs / one_million; 397 usec = elapsed_usecs % one_million; 398} 399 400/// Helper function to convert current elapsed time to seconds and 401/// nanoseconds. 402template <class T1, class T2> 403void 404getElapsedTimeNano(T1 &sec, T2 &nsec) 405{ 406 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns; 407 sec = elapsed_nsecs / one_billion; 408 nsec = elapsed_nsecs % one_billion; 409} 410 411////////////////////////////////////////////////////////////////////// 412// 413// The following emulation functions are generic, but need to be 414// templated to account for differences in types, constants, etc. 415// 416////////////////////////////////////////////////////////////////////// 417 418 typedef struct statfs hst_statfs; 419#if NO_STAT64 420 typedef struct stat hst_stat; 421 typedef struct stat hst_stat64; 422#else 423 typedef struct stat hst_stat; 424 typedef struct stat64 hst_stat64; 425#endif 426 427//// Helper function to convert a host stat buffer to a target stat 428//// buffer. Also copies the target buffer out to the simulated 429//// memory space. Used by stat(), fstat(), and lstat(). 430 431template <typename target_stat, typename host_stat> 432void 433convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) 434{ 435 using namespace TheISA; 436 437 if (fakeTTY) 438 tgt->st_dev = 0xA; 439 else 440 tgt->st_dev = host->st_dev; 441 tgt->st_dev = TheISA::htog(tgt->st_dev); 442 tgt->st_ino = host->st_ino; 443 tgt->st_ino = TheISA::htog(tgt->st_ino); 444 tgt->st_mode = host->st_mode; 445 if (fakeTTY) { 446 // Claim to be a character device 447 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT 448 tgt->st_mode |= S_IFCHR; // Set S_IFCHR 449 } 450 tgt->st_mode = TheISA::htog(tgt->st_mode); 451 tgt->st_nlink = host->st_nlink; 452 tgt->st_nlink = TheISA::htog(tgt->st_nlink); 453 tgt->st_uid = host->st_uid; 454 tgt->st_uid = TheISA::htog(tgt->st_uid); 455 tgt->st_gid = host->st_gid; 456 tgt->st_gid = TheISA::htog(tgt->st_gid); 457 if (fakeTTY) 458 tgt->st_rdev = 0x880d; 459 else 460 tgt->st_rdev = host->st_rdev; 461 tgt->st_rdev = TheISA::htog(tgt->st_rdev); 462 tgt->st_size = host->st_size; 463 tgt->st_size = TheISA::htog(tgt->st_size); 464 tgt->st_atimeX = host->st_atime; 465 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX); 466 tgt->st_mtimeX = host->st_mtime; 467 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX); 468 tgt->st_ctimeX = host->st_ctime; 469 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX); 470 // Force the block size to be 8KB. This helps to ensure buffered io works 471 // consistently across different hosts. 472 tgt->st_blksize = 0x2000; 473 tgt->st_blksize = TheISA::htog(tgt->st_blksize); 474 tgt->st_blocks = host->st_blocks; 475 tgt->st_blocks = TheISA::htog(tgt->st_blocks); 476} 477 478// Same for stat64 479 480template <typename target_stat, typename host_stat64> 481void 482convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) 483{ 484 using namespace TheISA; 485 486 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); 487#if defined(STAT_HAVE_NSEC) 488 tgt->st_atime_nsec = host->st_atime_nsec; 489 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec); 490 tgt->st_mtime_nsec = host->st_mtime_nsec; 491 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec); 492 tgt->st_ctime_nsec = host->st_ctime_nsec; 493 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec); 494#else 495 tgt->st_atime_nsec = 0; 496 tgt->st_mtime_nsec = 0; 497 tgt->st_ctime_nsec = 0; 498#endif 499} 500 501// Here are a couple of convenience functions 502template<class OS> 503void 504copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr, 505 hst_stat *host, bool fakeTTY = false) 506{ 507 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; 508 tgt_stat_buf tgt(addr); 509 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); 510 tgt.copyOut(mem); 511} 512 513template<class OS> 514void 515copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr, 516 hst_stat64 *host, bool fakeTTY = false) 517{ 518 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; 519 tgt_stat_buf tgt(addr); 520 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); 521 tgt.copyOut(mem); 522} 523 524template <class OS> 525void 526copyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr, 527 hst_statfs *host) 528{ 529 TypedBufferArg<typename OS::tgt_statfs> tgt(addr); 530 531 tgt->f_type = TheISA::htog(host->f_type); 532#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 533 tgt->f_bsize = TheISA::htog(host->f_iosize); 534#else 535 tgt->f_bsize = TheISA::htog(host->f_bsize); 536#endif 537 tgt->f_blocks = TheISA::htog(host->f_blocks); 538 tgt->f_bfree = TheISA::htog(host->f_bfree); 539 tgt->f_bavail = TheISA::htog(host->f_bavail); 540 tgt->f_files = TheISA::htog(host->f_files); 541 tgt->f_ffree = TheISA::htog(host->f_ffree); 542 memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid)); 543#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 544 tgt->f_namelen = TheISA::htog(host->f_namemax); 545 tgt->f_frsize = TheISA::htog(host->f_bsize); 546#elif defined(__APPLE__) 547 tgt->f_namelen = 0; 548 tgt->f_frsize = 0; 549#else 550 tgt->f_namelen = TheISA::htog(host->f_namelen); 551 tgt->f_frsize = TheISA::htog(host->f_frsize); 552#endif 553#if defined(__linux__) 554 memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare)); 555#else 556 /* 557 * The fields are different sizes per OS. Don't bother with 558 * f_spare or f_reserved on non-Linux for now. 559 */ 560 memset(&tgt->f_spare, 0, sizeof(tgt->f_spare)); 561#endif 562 563 tgt.copyOut(mem); 564} 565 566/// Target ioctl() handler. For the most part, programs call ioctl() 567/// only to find out if their stdout is a tty, to determine whether to 568/// do line or block buffering. We always claim that output fds are 569/// not TTYs to provide repeatable results. 570template <class OS> 571SyscallReturn 572ioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 573{ 574 int index = 0; 575 int tgt_fd = p->getSyscallArg(tc, index); 576 unsigned req = p->getSyscallArg(tc, index); 577 578 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req); 579 580 if (OS::isTtyReq(req)) 581 return -ENOTTY; 582 583 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]); 584 if (!dfdp) 585 return -EBADF; 586 587 /** 588 * If the driver is valid, issue the ioctl through it. Otherwise, 589 * there's an implicit assumption that the device is a TTY type and we 590 * return that we do not have a valid TTY. 591 */ 592 EmulatedDriver *emul_driver = dfdp->getDriver(); 593 if (emul_driver) 594 return emul_driver->ioctl(p, tc, req); 595 596 /** 597 * For lack of a better return code, return ENOTTY. Ideally, we should 598 * return something better here, but at least we issue the warning. 599 */ 600 warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n", 601 tgt_fd, req, tc->pcState()); 602 return -ENOTTY; 603} 604 605template <class OS> 606SyscallReturn 607openImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 608 bool isopenat) 609{ 610 int index = 0; 611 int tgt_dirfd = -1; 612 613 /** 614 * If using the openat variant, read in the target directory file 615 * descriptor from the simulated process. 616 */ 617 if (isopenat) 618 tgt_dirfd = p->getSyscallArg(tc, index); 619 620 /** 621 * Retrieve the simulated process' memory proxy and then read in the path 622 * string from that memory space into the host's working memory space. 623 */ 624 std::string path; 625 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 626 return -EFAULT; 627 628#ifdef __CYGWIN32__ 629 int host_flags = O_BINARY; 630#else 631 int host_flags = 0; 632#endif 633 /** 634 * Translate target flags into host flags. Flags exist which are not 635 * ported between architectures which can cause check failures. 636 */ 637 int tgt_flags = p->getSyscallArg(tc, index); 638 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { 639 if (tgt_flags & OS::openFlagTable[i].tgtFlag) { 640 tgt_flags &= ~OS::openFlagTable[i].tgtFlag; 641 host_flags |= OS::openFlagTable[i].hostFlag; 642 } 643 } 644 if (tgt_flags) { 645 warn("open%s: cannot decode flags 0x%x", 646 isopenat ? "at" : "", tgt_flags); 647 } 648#ifdef __CYGWIN32__ 649 host_flags |= O_BINARY; 650#endif 651 652 int mode = p->getSyscallArg(tc, index); 653 654 /** 655 * If the simulated process called open or openat with AT_FDCWD specified, 656 * take the current working directory value which was passed into the 657 * process class as a Python parameter and append the current path to 658 * create a full path. 659 * Otherwise, openat with a valid target directory file descriptor has 660 * been called. If the path option, which was passed in as a parameter, 661 * is not absolute, retrieve the directory file descriptor's path and 662 * prepend it to the path passed in as a parameter. 663 * In every case, we should have a full path (which is relevant to the 664 * host) to work with after this block has been passed. 665 */ 666 if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) { 667 path = p->fullPath(path); 668 } else if (!startswith(path, "/")) { 669 std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]); 670 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 671 if (!ffdp) 672 return -EBADF; 673 path.insert(0, ffdp->getFileName()); 674 } 675 676 /** 677 * Since this is an emulated environment, we create pseudo file 678 * descriptors for device requests that have been registered with 679 * the process class through Python; this allows us to create a file 680 * descriptor for subsequent ioctl or mmap calls. 681 */ 682 if (startswith(path, "/dev/")) { 683 std::string filename = path.substr(strlen("/dev/")); 684 EmulatedDriver *drv = p->findDriver(filename); 685 if (drv) { 686 DPRINTF_SYSCALL(Verbose, "open%s: passing call to " 687 "driver open with path[%s]\n", 688 isopenat ? "at" : "", path.c_str()); 689 return drv->open(p, tc, mode, host_flags); 690 } 691 /** 692 * Fall through here for pass through to host devices, such 693 * as /dev/zero 694 */ 695 } 696 697 /** 698 * Some special paths and files cannot be called on the host and need 699 * to be handled as special cases inside the simulator. 700 * If the full path that was created above does not match any of the 701 * special cases, pass it through to the open call on the host to let 702 * the host open the file on our behalf. 703 * If the host cannot open the file, return the host's error code back 704 * through the system call to the simulated process. 705 */ 706 int sim_fd = -1; 707 std::vector<std::string> special_paths = 708 { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" }; 709 for (auto entry : special_paths) { 710 if (startswith(path, entry)) 711 sim_fd = OS::openSpecialFile(path, p, tc); 712 } 713 if (sim_fd == -1) { 714 sim_fd = open(path.c_str(), host_flags, mode); 715 } 716 if (sim_fd == -1) { 717 int local = -errno; 718 DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n", 719 isopenat ? "at" : "", path.c_str()); 720 return local; 721 } 722 723 /** 724 * The file was opened successfully and needs to be recorded in the 725 * process' file descriptor array so that it can be retrieved later. 726 * The target file descriptor that is chosen will be the lowest unused 727 * file descriptor. 728 * Return the indirect target file descriptor back to the simulated 729 * process to act as a handle for the opened file. 730 */ 731 auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0); 732 int tgt_fd = p->fds->allocFD(ffdp); 733 DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n", 734 isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str()); 735 return tgt_fd; 736} 737 738/// Target open() handler. 739template <class OS> 740SyscallReturn 741openFunc(SyscallDesc *desc, int callnum, Process *process, 742 ThreadContext *tc) 743{ 744 return openImpl<OS>(desc, callnum, process, tc, false); 745} 746 747/// Target openat() handler. 748template <class OS> 749SyscallReturn 750openatFunc(SyscallDesc *desc, int callnum, Process *process, 751 ThreadContext *tc) 752{ 753 return openImpl<OS>(desc, callnum, process, tc, true); 754} 755 756/// Target unlinkat() handler. 757template <class OS> 758SyscallReturn 759unlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 760 ThreadContext *tc) 761{ 762 int index = 0; 763 int dirfd = process->getSyscallArg(tc, index); 764 if (dirfd != OS::TGT_AT_FDCWD) 765 warn("unlinkat: first argument not AT_FDCWD; unlikely to work"); 766 767 return unlinkHelper(desc, callnum, process, tc, 1); 768} 769 770/// Target facessat() handler 771template <class OS> 772SyscallReturn 773faccessatFunc(SyscallDesc *desc, int callnum, Process *process, 774 ThreadContext *tc) 775{ 776 int index = 0; 777 int dirfd = process->getSyscallArg(tc, index); 778 if (dirfd != OS::TGT_AT_FDCWD) 779 warn("faccessat: first argument not AT_FDCWD; unlikely to work"); 780 return accessFunc(desc, callnum, process, tc, 1); 781} 782 783/// Target readlinkat() handler 784template <class OS> 785SyscallReturn 786readlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 787 ThreadContext *tc) 788{ 789 int index = 0; 790 int dirfd = process->getSyscallArg(tc, index); 791 if (dirfd != OS::TGT_AT_FDCWD) 792 warn("openat: first argument not AT_FDCWD; unlikely to work"); 793 return readlinkFunc(desc, callnum, process, tc, 1); 794} 795 796/// Target renameat() handler. 797template <class OS> 798SyscallReturn 799renameatFunc(SyscallDesc *desc, int callnum, Process *process, 800 ThreadContext *tc) 801{ 802 int index = 0; 803 804 int olddirfd = process->getSyscallArg(tc, index); 805 if (olddirfd != OS::TGT_AT_FDCWD) 806 warn("renameat: first argument not AT_FDCWD; unlikely to work"); 807 808 std::string old_name; 809 810 if (!tc->getMemProxy().tryReadString(old_name, 811 process->getSyscallArg(tc, index))) 812 return -EFAULT; 813 814 int newdirfd = process->getSyscallArg(tc, index); 815 if (newdirfd != OS::TGT_AT_FDCWD) 816 warn("renameat: third argument not AT_FDCWD; unlikely to work"); 817 818 std::string new_name; 819 820 if (!tc->getMemProxy().tryReadString(new_name, 821 process->getSyscallArg(tc, index))) 822 return -EFAULT; 823 824 // Adjust path for current working directory 825 old_name = process->fullPath(old_name); 826 new_name = process->fullPath(new_name); 827 828 int result = rename(old_name.c_str(), new_name.c_str()); 829 return (result == -1) ? -errno : result; 830} 831 832/// Target sysinfo() handler. 833template <class OS> 834SyscallReturn 835sysinfoFunc(SyscallDesc *desc, int callnum, Process *process, 836 ThreadContext *tc) 837{ 838 839 int index = 0; 840 TypedBufferArg<typename OS::tgt_sysinfo> 841 sysinfo(process->getSyscallArg(tc, index)); 842 843 sysinfo->uptime = seconds_since_epoch; 844 sysinfo->totalram = process->system->memSize(); 845 sysinfo->mem_unit = 1; 846 847 sysinfo.copyOut(tc->getMemProxy()); 848 849 return 0; 850} 851 852/// Target chmod() handler. 853template <class OS> 854SyscallReturn 855chmodFunc(SyscallDesc *desc, int callnum, Process *process, 856 ThreadContext *tc) 857{ 858 std::string path; 859 860 int index = 0; 861 if (!tc->getMemProxy().tryReadString(path, 862 process->getSyscallArg(tc, index))) { 863 return -EFAULT; 864 } 865 866 uint32_t mode = process->getSyscallArg(tc, index); 867 mode_t hostMode = 0; 868 869 // XXX translate mode flags via OS::something??? 870 hostMode = mode; 871 872 // Adjust path for current working directory 873 path = process->fullPath(path); 874 875 // do the chmod 876 int result = chmod(path.c_str(), hostMode); 877 if (result < 0) 878 return -errno; 879 880 return 0; 881} 882 883 884/// Target fchmod() handler. 885template <class OS> 886SyscallReturn 887fchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 888{ 889 int index = 0; 890 int tgt_fd = p->getSyscallArg(tc, index); 891 uint32_t mode = p->getSyscallArg(tc, index); 892 893 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 894 if (!ffdp) 895 return -EBADF; 896 int sim_fd = ffdp->getSimFD(); 897 898 mode_t hostMode = mode; 899 900 int result = fchmod(sim_fd, hostMode); 901 902 return (result < 0) ? -errno : 0; 903} 904 905/// Target mremap() handler. 906template <class OS> 907SyscallReturn 908mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 909{ 910 int index = 0; 911 Addr start = process->getSyscallArg(tc, index); 912 uint64_t old_length = process->getSyscallArg(tc, index); 913 uint64_t new_length = process->getSyscallArg(tc, index); 914 uint64_t flags = process->getSyscallArg(tc, index); 915 uint64_t provided_address = 0; 916 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED; 917 918 if (use_provided_address) 919 provided_address = process->getSyscallArg(tc, index); 920 921 if ((start % TheISA::PageBytes != 0) || 922 (provided_address % TheISA::PageBytes != 0)) { 923 warn("mremap failing: arguments not page aligned"); 924 return -EINVAL; 925 } 926 927 new_length = roundUp(new_length, TheISA::PageBytes); 928 929 if (new_length > old_length) { 930 std::shared_ptr<MemState> mem_state = process->memState; 931 Addr mmap_end = mem_state->getMmapEnd(); 932 933 if ((start + old_length) == mmap_end && 934 (!use_provided_address || provided_address == start)) { 935 // This case cannot occur when growing downward, as 936 // start is greater than or equal to mmap_end. 937 uint64_t diff = new_length - old_length; 938 process->allocateMem(mmap_end, diff); 939 mem_state->setMmapEnd(mmap_end + diff); 940 return start; 941 } else { 942 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) { 943 warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); 944 return -ENOMEM; 945 } else { 946 uint64_t new_start = provided_address; 947 if (!use_provided_address) { 948 new_start = process->mmapGrowsDown() ? 949 mmap_end - new_length : mmap_end; 950 mmap_end = process->mmapGrowsDown() ? 951 new_start : mmap_end + new_length; 952 mem_state->setMmapEnd(mmap_end); 953 } 954 955 process->pTable->remap(start, old_length, new_start); 956 warn("mremapping to new vaddr %08p-%08p, adding %d\n", 957 new_start, new_start + new_length, 958 new_length - old_length); 959 // add on the remaining unallocated pages 960 process->allocateMem(new_start + old_length, 961 new_length - old_length, 962 use_provided_address /* clobber */); 963 if (use_provided_address && 964 ((new_start + new_length > mem_state->getMmapEnd() && 965 !process->mmapGrowsDown()) || 966 (new_start < mem_state->getMmapEnd() && 967 process->mmapGrowsDown()))) { 968 // something fishy going on here, at least notify the user 969 // @todo: increase mmap_end? 970 warn("mmap region limit exceeded with MREMAP_FIXED\n"); 971 } 972 warn("returning %08p as start\n", new_start); 973 return new_start; 974 } 975 } 976 } else { 977 if (use_provided_address && provided_address != start) 978 process->pTable->remap(start, new_length, provided_address); 979 process->pTable->unmap(start + new_length, old_length - new_length); 980 return use_provided_address ? provided_address : start; 981 } 982} 983 984/// Target stat() handler. 985template <class OS> 986SyscallReturn 987statFunc(SyscallDesc *desc, int callnum, Process *process, 988 ThreadContext *tc) 989{ 990 std::string path; 991 992 int index = 0; 993 if (!tc->getMemProxy().tryReadString(path, 994 process->getSyscallArg(tc, index))) { 995 return -EFAULT; 996 } 997 Addr bufPtr = process->getSyscallArg(tc, index); 998 999 // Adjust path for current working directory 1000 path = process->fullPath(path); 1001 1002 struct stat hostBuf; 1003 int result = stat(path.c_str(), &hostBuf); 1004 1005 if (result < 0) 1006 return -errno; 1007 1008 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1009 1010 return 0; 1011} 1012 1013 1014/// Target stat64() handler. 1015template <class OS> 1016SyscallReturn 1017stat64Func(SyscallDesc *desc, int callnum, Process *process, 1018 ThreadContext *tc) 1019{ 1020 std::string path; 1021 1022 int index = 0; 1023 if (!tc->getMemProxy().tryReadString(path, 1024 process->getSyscallArg(tc, index))) 1025 return -EFAULT; 1026 Addr bufPtr = process->getSyscallArg(tc, index); 1027 1028 // Adjust path for current working directory 1029 path = process->fullPath(path); 1030 1031#if NO_STAT64 1032 struct stat hostBuf; 1033 int result = stat(path.c_str(), &hostBuf); 1034#else 1035 struct stat64 hostBuf; 1036 int result = stat64(path.c_str(), &hostBuf); 1037#endif 1038 1039 if (result < 0) 1040 return -errno; 1041 1042 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1043 1044 return 0; 1045} 1046 1047 1048/// Target fstatat64() handler. 1049template <class OS> 1050SyscallReturn 1051fstatat64Func(SyscallDesc *desc, int callnum, Process *process, 1052 ThreadContext *tc) 1053{ 1054 int index = 0; 1055 int dirfd = process->getSyscallArg(tc, index); 1056 if (dirfd != OS::TGT_AT_FDCWD) 1057 warn("fstatat64: first argument not AT_FDCWD; unlikely to work"); 1058 1059 std::string path; 1060 if (!tc->getMemProxy().tryReadString(path, 1061 process->getSyscallArg(tc, index))) 1062 return -EFAULT; 1063 Addr bufPtr = process->getSyscallArg(tc, index); 1064 1065 // Adjust path for current working directory 1066 path = process->fullPath(path); 1067 1068#if NO_STAT64 1069 struct stat hostBuf; 1070 int result = stat(path.c_str(), &hostBuf); 1071#else 1072 struct stat64 hostBuf; 1073 int result = stat64(path.c_str(), &hostBuf); 1074#endif 1075 1076 if (result < 0) 1077 return -errno; 1078 1079 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1080 1081 return 0; 1082} 1083 1084 1085/// Target fstat64() handler. 1086template <class OS> 1087SyscallReturn 1088fstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1089{ 1090 int index = 0; 1091 int tgt_fd = p->getSyscallArg(tc, index); 1092 Addr bufPtr = p->getSyscallArg(tc, index); 1093 1094 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1095 if (!ffdp) 1096 return -EBADF; 1097 int sim_fd = ffdp->getSimFD(); 1098 1099#if NO_STAT64 1100 struct stat hostBuf; 1101 int result = fstat(sim_fd, &hostBuf); 1102#else 1103 struct stat64 hostBuf; 1104 int result = fstat64(sim_fd, &hostBuf); 1105#endif 1106 1107 if (result < 0) 1108 return -errno; 1109 1110 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1111 1112 return 0; 1113} 1114 1115 1116/// Target lstat() handler. 1117template <class OS> 1118SyscallReturn 1119lstatFunc(SyscallDesc *desc, int callnum, Process *process, 1120 ThreadContext *tc) 1121{ 1122 std::string path; 1123 1124 int index = 0; 1125 if (!tc->getMemProxy().tryReadString(path, 1126 process->getSyscallArg(tc, index))) { 1127 return -EFAULT; 1128 } 1129 Addr bufPtr = process->getSyscallArg(tc, index); 1130 1131 // Adjust path for current working directory 1132 path = process->fullPath(path); 1133 1134 struct stat hostBuf; 1135 int result = lstat(path.c_str(), &hostBuf); 1136 1137 if (result < 0) 1138 return -errno; 1139 1140 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1141 1142 return 0; 1143} 1144 1145/// Target lstat64() handler. 1146template <class OS> 1147SyscallReturn 1148lstat64Func(SyscallDesc *desc, int callnum, Process *process, 1149 ThreadContext *tc) 1150{ 1151 std::string path; 1152 1153 int index = 0; 1154 if (!tc->getMemProxy().tryReadString(path, 1155 process->getSyscallArg(tc, index))) { 1156 return -EFAULT; 1157 } 1158 Addr bufPtr = process->getSyscallArg(tc, index); 1159 1160 // Adjust path for current working directory 1161 path = process->fullPath(path); 1162 1163#if NO_STAT64 1164 struct stat hostBuf; 1165 int result = lstat(path.c_str(), &hostBuf); 1166#else 1167 struct stat64 hostBuf; 1168 int result = lstat64(path.c_str(), &hostBuf); 1169#endif 1170 1171 if (result < 0) 1172 return -errno; 1173 1174 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1175 1176 return 0; 1177} 1178 1179/// Target fstat() handler. 1180template <class OS> 1181SyscallReturn 1182fstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1183{ 1184 int index = 0; 1185 int tgt_fd = p->getSyscallArg(tc, index); 1186 Addr bufPtr = p->getSyscallArg(tc, index); 1187 1188 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd); 1189 1190 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1191 if (!ffdp) 1192 return -EBADF; 1193 int sim_fd = ffdp->getSimFD(); 1194 1195 struct stat hostBuf; 1196 int result = fstat(sim_fd, &hostBuf); 1197 1198 if (result < 0) 1199 return -errno; 1200 1201 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1202 1203 return 0; 1204} 1205 1206 1207/// Target statfs() handler. 1208template <class OS> 1209SyscallReturn 1210statfsFunc(SyscallDesc *desc, int callnum, Process *process, 1211 ThreadContext *tc) 1212{ 1213#if NO_STATFS 1214 warn("Host OS cannot support calls to statfs. Ignoring syscall"); 1215#else 1216 std::string path; 1217 1218 int index = 0; 1219 if (!tc->getMemProxy().tryReadString(path, 1220 process->getSyscallArg(tc, index))) { 1221 return -EFAULT; 1222 } 1223 Addr bufPtr = process->getSyscallArg(tc, index); 1224 1225 // Adjust path for current working directory 1226 path = process->fullPath(path); 1227 1228 struct statfs hostBuf; 1229 int result = statfs(path.c_str(), &hostBuf); 1230 1231 if (result < 0) 1232 return -errno; 1233 1234 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1235#endif 1236 return 0; 1237} 1238 1239template <class OS> 1240SyscallReturn 1241cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1242{ 1243 int index = 0; 1244 1245 TheISA::IntReg flags = p->getSyscallArg(tc, index); 1246 TheISA::IntReg newStack = p->getSyscallArg(tc, index); 1247 Addr ptidPtr = p->getSyscallArg(tc, index); 1248 1249#if THE_ISA == RISCV_ISA 1250 /** 1251 * Linux kernel 4.15 sets CLONE_BACKWARDS flag for RISC-V. 1252 * The flag defines the list of clone() arguments in the following 1253 * order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr 1254 */ 1255 Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index); 1256 Addr ctidPtr = p->getSyscallArg(tc, index); 1257#else 1258 Addr ctidPtr = p->getSyscallArg(tc, index); 1259 Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index); 1260#endif 1261 1262 if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) || 1263 ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) || 1264 ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) || 1265 ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) || 1266 ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) || 1267 ((flags & OS::TGT_CLONE_VM) && !(newStack))) 1268 return -EINVAL; 1269 1270 ThreadContext *ctc; 1271 if (!(ctc = p->findFreeContext())) 1272 fatal("clone: no spare thread context in system"); 1273 1274 /** 1275 * Note that ProcessParams is generated by swig and there are no other 1276 * examples of how to create anything but this default constructor. The 1277 * fields are manually initialized instead of passing parameters to the 1278 * constructor. 1279 */ 1280 ProcessParams *pp = new ProcessParams(); 1281 pp->executable.assign(*(new std::string(p->progName()))); 1282 pp->cmd.push_back(*(new std::string(p->progName()))); 1283 pp->system = p->system; 1284 pp->cwd.assign(p->getcwd()); 1285 pp->input.assign("stdin"); 1286 pp->output.assign("stdout"); 1287 pp->errout.assign("stderr"); 1288 pp->uid = p->uid(); 1289 pp->euid = p->euid(); 1290 pp->gid = p->gid(); 1291 pp->egid = p->egid(); 1292 1293 /* Find the first free PID that's less than the maximum */ 1294 std::set<int> const& pids = p->system->PIDs; 1295 int temp_pid = *pids.begin(); 1296 do { 1297 temp_pid++; 1298 } while (pids.find(temp_pid) != pids.end()); 1299 if (temp_pid >= System::maxPID) 1300 fatal("temp_pid is too large: %d", temp_pid); 1301 1302 pp->pid = temp_pid; 1303 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid(); 1304 Process *cp = pp->create(); 1305 delete pp; 1306 1307 Process *owner = ctc->getProcessPtr(); 1308 ctc->setProcessPtr(cp); 1309 cp->assignThreadContext(ctc->contextId()); 1310 owner->revokeThreadContext(ctc->contextId()); 1311 1312 if (flags & OS::TGT_CLONE_PARENT_SETTID) { 1313 BufferArg ptidBuf(ptidPtr, sizeof(long)); 1314 long *ptid = (long *)ptidBuf.bufferPtr(); 1315 *ptid = cp->pid(); 1316 ptidBuf.copyOut(tc->getMemProxy()); 1317 } 1318 1319 cp->initState(); 1320 p->clone(tc, ctc, cp, flags); 1321 1322 if (flags & OS::TGT_CLONE_THREAD) { 1323 delete cp->sigchld; 1324 cp->sigchld = p->sigchld; 1325 } else if (flags & OS::TGT_SIGCHLD) { 1326 *cp->sigchld = true; 1327 } 1328 1329 if (flags & OS::TGT_CLONE_CHILD_SETTID) { 1330 BufferArg ctidBuf(ctidPtr, sizeof(long)); 1331 long *ctid = (long *)ctidBuf.bufferPtr(); 1332 *ctid = cp->pid(); 1333 ctidBuf.copyOut(ctc->getMemProxy()); 1334 } 1335 1336 if (flags & OS::TGT_CLONE_CHILD_CLEARTID) 1337 cp->childClearTID = (uint64_t)ctidPtr; 1338 1339 ctc->clearArchRegs(); 1340 1341#if THE_ISA == ALPHA_ISA 1342 TheISA::copyMiscRegs(tc, ctc); 1343#elif THE_ISA == SPARC_ISA 1344 TheISA::copyRegs(tc, ctc); 1345 ctc->setIntReg(TheISA::NumIntArchRegs + 6, 0); 1346 ctc->setIntReg(TheISA::NumIntArchRegs + 4, 0); 1347 ctc->setIntReg(TheISA::NumIntArchRegs + 3, TheISA::NWindows - 2); 1348 ctc->setIntReg(TheISA::NumIntArchRegs + 5, TheISA::NWindows); 1349 ctc->setMiscReg(TheISA::MISCREG_CWP, 0); 1350 ctc->setIntReg(TheISA::NumIntArchRegs + 7, 0); 1351 ctc->setMiscRegNoEffect(TheISA::MISCREG_TL, 0); 1352 ctc->setMiscReg(TheISA::MISCREG_ASI, TheISA::ASI_PRIMARY); 1353 for (int y = 8; y < 32; y++) 1354 ctc->setIntReg(y, tc->readIntReg(y)); 1355#elif THE_ISA == ARM_ISA or THE_ISA == X86_ISA or THE_ISA == RISCV_ISA 1356 TheISA::copyRegs(tc, ctc); 1357#endif 1358 1359#if THE_ISA == X86_ISA 1360 if (flags & OS::TGT_CLONE_SETTLS) { 1361 ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_BASE, tlsPtr); 1362 ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_EFF_BASE, tlsPtr); 1363 } 1364#endif 1365 1366 if (newStack) 1367 ctc->setIntReg(TheISA::StackPointerReg, newStack); 1368 1369 cp->setSyscallReturn(ctc, 0); 1370 1371#if THE_ISA == ALPHA_ISA 1372 ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 1373#elif THE_ISA == SPARC_ISA 1374 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 1375 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 1376#endif 1377 1378 ctc->pcState(tc->nextInstAddr()); 1379 ctc->activate(); 1380 1381 return cp->pid(); 1382} 1383 1384/// Target fstatfs() handler. 1385template <class OS> 1386SyscallReturn 1387fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1388{ 1389 int index = 0; 1390 int tgt_fd = p->getSyscallArg(tc, index); 1391 Addr bufPtr = p->getSyscallArg(tc, index); 1392 1393 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1394 if (!ffdp) 1395 return -EBADF; 1396 int sim_fd = ffdp->getSimFD(); 1397 1398 struct statfs hostBuf; 1399 int result = fstatfs(sim_fd, &hostBuf); 1400 1401 if (result < 0) 1402 return -errno; 1403 1404 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1405 1406 return 0; 1407} 1408 1409 1410/// Target writev() handler. 1411template <class OS> 1412SyscallReturn 1413writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1414{ 1415 int index = 0; 1416 int tgt_fd = p->getSyscallArg(tc, index); 1417 1418 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 1419 if (!hbfdp) 1420 return -EBADF; 1421 int sim_fd = hbfdp->getSimFD(); 1422 1423 SETranslatingPortProxy &prox = tc->getMemProxy(); 1424 uint64_t tiov_base = p->getSyscallArg(tc, index); 1425 size_t count = p->getSyscallArg(tc, index); 1426 struct iovec hiov[count]; 1427 for (size_t i = 0; i < count; ++i) { 1428 typename OS::tgt_iovec tiov; 1429 1430 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), 1431 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); 1432 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len); 1433 hiov[i].iov_base = new char [hiov[i].iov_len]; 1434 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, 1435 hiov[i].iov_len); 1436 } 1437 1438 int result = writev(sim_fd, hiov, count); 1439 1440 for (size_t i = 0; i < count; ++i) 1441 delete [] (char *)hiov[i].iov_base; 1442 1443 if (result < 0) 1444 return -errno; 1445 1446 return result; 1447} 1448 1449/// Real mmap handler. 1450template <class OS> 1451SyscallReturn 1452mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 1453 bool is_mmap2) 1454{ 1455 int index = 0; 1456 Addr start = p->getSyscallArg(tc, index); 1457 uint64_t length = p->getSyscallArg(tc, index); 1458 int prot = p->getSyscallArg(tc, index); 1459 int tgt_flags = p->getSyscallArg(tc, index); 1460 int tgt_fd = p->getSyscallArg(tc, index); 1461 int offset = p->getSyscallArg(tc, index); 1462 1463 if (is_mmap2) 1464 offset *= TheISA::PageBytes; 1465 1466 if (start & (TheISA::PageBytes - 1) || 1467 offset & (TheISA::PageBytes - 1) || 1468 (tgt_flags & OS::TGT_MAP_PRIVATE && 1469 tgt_flags & OS::TGT_MAP_SHARED) || 1470 (!(tgt_flags & OS::TGT_MAP_PRIVATE) && 1471 !(tgt_flags & OS::TGT_MAP_SHARED)) || 1472 !length) { 1473 return -EINVAL; 1474 } 1475 1476 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) { 1477 // With shared mmaps, there are two cases to consider: 1478 // 1) anonymous: writes should modify the mapping and this should be 1479 // visible to observers who share the mapping. Currently, it's 1480 // difficult to update the shared mapping because there's no 1481 // structure which maintains information about the which virtual 1482 // memory areas are shared. If that structure existed, it would be 1483 // possible to make the translations point to the same frames. 1484 // 2) file-backed: writes should modify the mapping and the file 1485 // which is backed by the mapping. The shared mapping problem is the 1486 // same as what was mentioned about the anonymous mappings. For 1487 // file-backed mappings, the writes to the file are difficult 1488 // because it requires syncing what the mapping holds with the file 1489 // that resides on the host system. So, any write on a real system 1490 // would cause the change to be propagated to the file mapping at 1491 // some point in the future (the inode is tracked along with the 1492 // mapping). This isn't guaranteed to always happen, but it usually 1493 // works well enough. The guarantee is provided by the msync system 1494 // call. We could force the change through with shared mappings with 1495 // a call to msync, but that again would require more information 1496 // than we currently maintain. 1497 warn("mmap: writing to shared mmap region is currently " 1498 "unsupported. The write succeeds on the target, but it " 1499 "will not be propagated to the host or shared mappings"); 1500 } 1501 1502 length = roundUp(length, TheISA::PageBytes); 1503 1504 int sim_fd = -1; 1505 uint8_t *pmap = nullptr; 1506 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) { 1507 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1508 1509 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep); 1510 if (dfdp) { 1511 EmulatedDriver *emul_driver = dfdp->getDriver(); 1512 return emul_driver->mmap(p, tc, start, length, prot, 1513 tgt_flags, tgt_fd, offset); 1514 } 1515 1516 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1517 if (!ffdp) 1518 return -EBADF; 1519 sim_fd = ffdp->getSimFD(); 1520 1521 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE, 1522 sim_fd, offset); 1523 1524 if (pmap == (decltype(pmap))-1) { 1525 warn("mmap: failed to map file into host address space"); 1526 return -errno; 1527 } 1528 } 1529 1530 // Extend global mmap region if necessary. Note that we ignore the 1531 // start address unless MAP_FIXED is specified. 1532 if (!(tgt_flags & OS::TGT_MAP_FIXED)) { 1533 std::shared_ptr<MemState> mem_state = p->memState; 1534 Addr mmap_end = mem_state->getMmapEnd(); 1535 1536 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end; 1537 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length; 1538 1539 mem_state->setMmapEnd(mmap_end); 1540 } 1541 1542 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n", 1543 start, start + length - 1); 1544 1545 // We only allow mappings to overwrite existing mappings if 1546 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem 1547 // because we ignore the start hint if TGT_MAP_FIXED is not set. 1548 int clobber = tgt_flags & OS::TGT_MAP_FIXED; 1549 if (clobber) { 1550 for (auto tc : p->system->threadContexts) { 1551 // If we might be overwriting old mappings, we need to 1552 // invalidate potentially stale mappings out of the TLBs. 1553 tc->getDTBPtr()->flushAll(); 1554 tc->getITBPtr()->flushAll(); 1555 } 1556 } 1557 1558 // Allocate physical memory and map it in. If the page table is already 1559 // mapped and clobber is not set, the simulator will issue throw a 1560 // fatal and bail out of the simulation. 1561 p->allocateMem(start, length, clobber); 1562 1563 // Transfer content into target address space. 1564 SETranslatingPortProxy &tp = tc->getMemProxy(); 1565 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) { 1566 // In general, we should zero the mapped area for anonymous mappings, 1567 // with something like: 1568 // tp.memsetBlob(start, 0, length); 1569 // However, given that we don't support sparse mappings, and 1570 // some applications can map a couple of gigabytes of space 1571 // (intending sparse usage), that can get painfully expensive. 1572 // Fortunately, since we don't properly implement munmap either, 1573 // there's no danger of remapping used memory, so for now all 1574 // newly mapped memory should already be zeroed so we can skip it. 1575 } else { 1576 // It is possible to mmap an area larger than a file, however 1577 // accessing unmapped portions the system triggers a "Bus error" 1578 // on the host. We must know when to stop copying the file from 1579 // the host into the target address space. 1580 struct stat file_stat; 1581 if (fstat(sim_fd, &file_stat) > 0) 1582 fatal("mmap: cannot stat file"); 1583 1584 // Copy the portion of the file that is resident. This requires 1585 // checking both the mmap size and the filesize that we are 1586 // trying to mmap into this space; the mmap size also depends 1587 // on the specified offset into the file. 1588 uint64_t size = std::min((uint64_t)file_stat.st_size - offset, 1589 length); 1590 tp.writeBlob(start, pmap, size); 1591 1592 // Cleanup the mmap region before exiting this function. 1593 munmap(pmap, length); 1594 1595 // Maintain the symbol table for dynamic executables. 1596 // The loader will call mmap to map the images into its address 1597 // space and we intercept that here. We can verify that we are 1598 // executing inside the loader by checking the program counter value. 1599 // XXX: with multiprogrammed workloads or multi-node configurations, 1600 // this will not work since there is a single global symbol table. 1601 ObjectFile *interpreter = p->getInterpreter(); 1602 if (interpreter) { 1603 Addr text_start = interpreter->textBase(); 1604 Addr text_end = text_start + interpreter->textSize(); 1605 1606 Addr pc = tc->pcState().pc(); 1607 1608 if (pc >= text_start && pc < text_end) { 1609 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1610 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1611 ObjectFile *lib = createObjectFile(ffdp->getFileName()); 1612 1613 if (lib) { 1614 lib->loadAllSymbols(debugSymbolTable, 1615 lib->textBase(), start); 1616 } 1617 } 1618 } 1619 1620 // Note that we do not zero out the remainder of the mapping. This 1621 // is done by a real system, but it probably will not affect 1622 // execution (hopefully). 1623 } 1624 1625 return start; 1626} 1627 1628template <class OS> 1629SyscallReturn 1630pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1631{ 1632 int index = 0; 1633 int tgt_fd = p->getSyscallArg(tc, index); 1634 Addr bufPtr = p->getSyscallArg(tc, index); 1635 int nbytes = p->getSyscallArg(tc, index); 1636 int offset = p->getSyscallArg(tc, index); 1637 1638 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1639 if (!ffdp) 1640 return -EBADF; 1641 int sim_fd = ffdp->getSimFD(); 1642 1643 BufferArg bufArg(bufPtr, nbytes); 1644 bufArg.copyIn(tc->getMemProxy()); 1645 1646 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset); 1647 1648 return (bytes_written == -1) ? -errno : bytes_written; 1649} 1650 1651/// Target mmap() handler. 1652template <class OS> 1653SyscallReturn 1654mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1655{ 1656 return mmapImpl<OS>(desc, num, p, tc, false); 1657} 1658 1659/// Target mmap2() handler. 1660template <class OS> 1661SyscallReturn 1662mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1663{ 1664 return mmapImpl<OS>(desc, num, p, tc, true); 1665} 1666 1667/// Target getrlimit() handler. 1668template <class OS> 1669SyscallReturn 1670getrlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1671 ThreadContext *tc) 1672{ 1673 int index = 0; 1674 unsigned resource = process->getSyscallArg(tc, index); 1675 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index)); 1676 1677 switch (resource) { 1678 case OS::TGT_RLIMIT_STACK: 1679 // max stack size in bytes: make up a number (8MB for now) 1680 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1681 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1682 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1683 break; 1684 1685 case OS::TGT_RLIMIT_DATA: 1686 // max data segment size in bytes: make up a number 1687 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; 1688 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1689 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1690 break; 1691 1692 default: 1693 warn("getrlimit: unimplemented resource %d", resource); 1694 return -EINVAL; 1695 break; 1696 } 1697 1698 rlp.copyOut(tc->getMemProxy()); 1699 return 0; 1700} 1701 1702template <class OS> 1703SyscallReturn 1704prlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1705 ThreadContext *tc) 1706{ 1707 int index = 0; 1708 if (process->getSyscallArg(tc, index) != 0) 1709 { 1710 warn("prlimit: ignoring rlimits for nonzero pid"); 1711 return -EPERM; 1712 } 1713 int resource = process->getSyscallArg(tc, index); 1714 Addr n = process->getSyscallArg(tc, index); 1715 if (n != 0) 1716 warn("prlimit: ignoring new rlimit"); 1717 Addr o = process->getSyscallArg(tc, index); 1718 if (o != 0) 1719 { 1720 TypedBufferArg<typename OS::rlimit> rlp(o); 1721 switch (resource) { 1722 case OS::TGT_RLIMIT_STACK: 1723 // max stack size in bytes: make up a number (8MB for now) 1724 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1725 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1726 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1727 break; 1728 case OS::TGT_RLIMIT_DATA: 1729 // max data segment size in bytes: make up a number 1730 rlp->rlim_cur = rlp->rlim_max = 256*1024*1024; 1731 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1732 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1733 default: 1734 warn("prlimit: unimplemented resource %d", resource); 1735 return -EINVAL; 1736 break; 1737 } 1738 rlp.copyOut(tc->getMemProxy()); 1739 } 1740 return 0; 1741} 1742 1743/// Target clock_gettime() function. 1744template <class OS> 1745SyscallReturn 1746clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1747{ 1748 int index = 1; 1749 //int clk_id = p->getSyscallArg(tc, index); 1750 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1751 1752 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec); 1753 tp->tv_sec += seconds_since_epoch; 1754 tp->tv_sec = TheISA::htog(tp->tv_sec); 1755 tp->tv_nsec = TheISA::htog(tp->tv_nsec); 1756 1757 tp.copyOut(tc->getMemProxy()); 1758 1759 return 0; 1760} 1761 1762/// Target clock_getres() function. 1763template <class OS> 1764SyscallReturn 1765clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1766{ 1767 int index = 1; 1768 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1769 1770 // Set resolution at ns, which is what clock_gettime() returns 1771 tp->tv_sec = 0; 1772 tp->tv_nsec = 1; 1773 1774 tp.copyOut(tc->getMemProxy()); 1775 1776 return 0; 1777} 1778 1779/// Target gettimeofday() handler. 1780template <class OS> 1781SyscallReturn 1782gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process, 1783 ThreadContext *tc) 1784{ 1785 int index = 0; 1786 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index)); 1787 1788 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec); 1789 tp->tv_sec += seconds_since_epoch; 1790 tp->tv_sec = TheISA::htog(tp->tv_sec); 1791 tp->tv_usec = TheISA::htog(tp->tv_usec); 1792 1793 tp.copyOut(tc->getMemProxy()); 1794 1795 return 0; 1796} 1797 1798 1799/// Target utimes() handler. 1800template <class OS> 1801SyscallReturn 1802utimesFunc(SyscallDesc *desc, int callnum, Process *process, 1803 ThreadContext *tc) 1804{ 1805 std::string path; 1806 1807 int index = 0; 1808 if (!tc->getMemProxy().tryReadString(path, 1809 process->getSyscallArg(tc, index))) { 1810 return -EFAULT; 1811 } 1812 1813 TypedBufferArg<typename OS::timeval [2]> 1814 tp(process->getSyscallArg(tc, index)); 1815 tp.copyIn(tc->getMemProxy()); 1816 1817 struct timeval hostTimeval[2]; 1818 for (int i = 0; i < 2; ++i) { 1819 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec); 1820 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec); 1821 } 1822 1823 // Adjust path for current working directory 1824 path = process->fullPath(path); 1825 1826 int result = utimes(path.c_str(), hostTimeval); 1827 1828 if (result < 0) 1829 return -errno; 1830 1831 return 0; 1832} 1833 1834template <class OS> 1835SyscallReturn 1836execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1837{ 1838 desc->setFlags(0); 1839 1840 int index = 0; 1841 std::string path; 1842 SETranslatingPortProxy & mem_proxy = tc->getMemProxy(); 1843 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index))) 1844 return -EFAULT; 1845 1846 if (access(path.c_str(), F_OK) == -1) 1847 return -EACCES; 1848 1849 auto read_in = [](std::vector<std::string> & vect, 1850 SETranslatingPortProxy & mem_proxy, 1851 Addr mem_loc) 1852 { 1853 for (int inc = 0; ; inc++) { 1854 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr)); 1855 b.copyIn(mem_proxy); 1856 1857 if (!*(Addr*)b.bufferPtr()) 1858 break; 1859 1860 vect.push_back(std::string()); 1861 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr()); 1862 } 1863 }; 1864 1865 /** 1866 * Note that ProcessParams is generated by swig and there are no other 1867 * examples of how to create anything but this default constructor. The 1868 * fields are manually initialized instead of passing parameters to the 1869 * constructor. 1870 */ 1871 ProcessParams *pp = new ProcessParams(); 1872 pp->executable = path; 1873 Addr argv_mem_loc = p->getSyscallArg(tc, index); 1874 read_in(pp->cmd, mem_proxy, argv_mem_loc); 1875 Addr envp_mem_loc = p->getSyscallArg(tc, index); 1876 read_in(pp->env, mem_proxy, envp_mem_loc); 1877 pp->uid = p->uid(); 1878 pp->egid = p->egid(); 1879 pp->euid = p->euid(); 1880 pp->gid = p->gid(); 1881 pp->ppid = p->ppid(); 1882 pp->pid = p->pid(); 1883 pp->input.assign("cin"); 1884 pp->output.assign("cout"); 1885 pp->errout.assign("cerr"); 1886 pp->cwd.assign(p->getcwd()); 1887 pp->system = p->system; 1888 /** 1889 * Prevent process object creation with identical PIDs (which will trip 1890 * a fatal check in Process constructor). The execve call is supposed to 1891 * take over the currently executing process' identity but replace 1892 * whatever it is doing with a new process image. Instead of hijacking 1893 * the process object in the simulator, we create a new process object 1894 * and bind to the previous process' thread below (hijacking the thread). 1895 */ 1896 p->system->PIDs.erase(p->pid()); 1897 Process *new_p = pp->create(); 1898 delete pp; 1899 1900 /** 1901 * Work through the file descriptor array and close any files marked 1902 * close-on-exec. 1903 */ 1904 new_p->fds = p->fds; 1905 for (int i = 0; i < new_p->fds->getSize(); i++) { 1906 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i]; 1907 if (fdep && fdep->getCOE()) 1908 new_p->fds->closeFDEntry(i); 1909 } 1910 1911 *new_p->sigchld = true; 1912 1913 delete p; 1914 tc->clearArchRegs(); 1915 tc->setProcessPtr(new_p); 1916 new_p->assignThreadContext(tc->contextId()); 1917 new_p->initState(); 1918 tc->activate(); 1919 TheISA::PCState pcState = tc->pcState(); 1920 tc->setNPC(pcState.instAddr()); 1921 1922 desc->setFlags(SyscallDesc::SuppressReturnValue); 1923 return 0; 1924} 1925 1926/// Target getrusage() function. 1927template <class OS> 1928SyscallReturn 1929getrusageFunc(SyscallDesc *desc, int callnum, Process *process, 1930 ThreadContext *tc) 1931{ 1932 int index = 0; 1933 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN 1934 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index)); 1935 1936 rup->ru_utime.tv_sec = 0; 1937 rup->ru_utime.tv_usec = 0; 1938 rup->ru_stime.tv_sec = 0; 1939 rup->ru_stime.tv_usec = 0; 1940 rup->ru_maxrss = 0; 1941 rup->ru_ixrss = 0; 1942 rup->ru_idrss = 0; 1943 rup->ru_isrss = 0; 1944 rup->ru_minflt = 0; 1945 rup->ru_majflt = 0; 1946 rup->ru_nswap = 0; 1947 rup->ru_inblock = 0; 1948 rup->ru_oublock = 0; 1949 rup->ru_msgsnd = 0; 1950 rup->ru_msgrcv = 0; 1951 rup->ru_nsignals = 0; 1952 rup->ru_nvcsw = 0; 1953 rup->ru_nivcsw = 0; 1954 1955 switch (who) { 1956 case OS::TGT_RUSAGE_SELF: 1957 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); 1958 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec); 1959 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec); 1960 break; 1961 1962 case OS::TGT_RUSAGE_CHILDREN: 1963 // do nothing. We have no child processes, so they take no time. 1964 break; 1965 1966 default: 1967 // don't really handle THREAD or CHILDREN, but just warn and 1968 // plow ahead 1969 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", 1970 who); 1971 } 1972 1973 rup.copyOut(tc->getMemProxy()); 1974 1975 return 0; 1976} 1977 1978/// Target times() function. 1979template <class OS> 1980SyscallReturn 1981timesFunc(SyscallDesc *desc, int callnum, Process *process, 1982 ThreadContext *tc) 1983{ 1984 int index = 0; 1985 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index)); 1986 1987 // Fill in the time structure (in clocks) 1988 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s; 1989 bufp->tms_utime = clocks; 1990 bufp->tms_stime = 0; 1991 bufp->tms_cutime = 0; 1992 bufp->tms_cstime = 0; 1993 1994 // Convert to host endianness 1995 bufp->tms_utime = TheISA::htog(bufp->tms_utime); 1996 1997 // Write back 1998 bufp.copyOut(tc->getMemProxy()); 1999 2000 // Return clock ticks since system boot 2001 return clocks; 2002} 2003 2004/// Target time() function. 2005template <class OS> 2006SyscallReturn 2007timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 2008{ 2009 typename OS::time_t sec, usec; 2010 getElapsedTimeMicro(sec, usec); 2011 sec += seconds_since_epoch; 2012 2013 int index = 0; 2014 Addr taddr = (Addr)process->getSyscallArg(tc, index); 2015 if (taddr != 0) { 2016 typename OS::time_t t = sec; 2017 t = TheISA::htog(t); 2018 SETranslatingPortProxy &p = tc->getMemProxy(); 2019 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t)); 2020 } 2021 return sec; 2022} 2023 2024template <class OS> 2025SyscallReturn 2026tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 2027{ 2028 int index = 0; 2029 int tgid = process->getSyscallArg(tc, index); 2030 int tid = process->getSyscallArg(tc, index); 2031 int sig = process->getSyscallArg(tc, index); 2032 2033 /** 2034 * This system call is intended to allow killing a specific thread 2035 * within an arbitrary thread group if sanctioned with permission checks. 2036 * It's usually true that threads share the termination signal as pointed 2037 * out by the pthread_kill man page and this seems to be the intended 2038 * usage. Due to this being an emulated environment, assume the following: 2039 * Threads are allowed to call tgkill because the EUID for all threads 2040 * should be the same. There is no signal handling mechanism for kernel 2041 * registration of signal handlers since signals are poorly supported in 2042 * emulation mode. Since signal handlers cannot be registered, all 2043 * threads within in a thread group must share the termination signal. 2044 * We never exhaust PIDs so there's no chance of finding the wrong one 2045 * due to PID rollover. 2046 */ 2047 2048 System *sys = tc->getSystemPtr(); 2049 Process *tgt_proc = nullptr; 2050 for (int i = 0; i < sys->numContexts(); i++) { 2051 Process *temp = sys->threadContexts[i]->getProcessPtr(); 2052 if (temp->pid() == tid) { 2053 tgt_proc = temp; 2054 break; 2055 } 2056 } 2057 2058 if (sig != 0 || sig != OS::TGT_SIGABRT) 2059 return -EINVAL; 2060 2061 if (tgt_proc == nullptr) 2062 return -ESRCH; 2063 2064 if (tgid != -1 && tgt_proc->tgid() != tgid) 2065 return -ESRCH; 2066 2067 if (sig == OS::TGT_SIGABRT) 2068 exitGroupFunc(desc, 252, process, tc); 2069 2070 return 0; 2071} 2072 2073 2074#endif // __SIM_SYSCALL_EMUL_HH__ 2075