syscall_emul.hh revision 13448
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/generic/tlb.hh" 97#include "arch/utility.hh" 98#include "base/intmath.hh" 99#include "base/loader/object_file.hh" 100#include "base/logging.hh" 101#include "base/trace.hh" 102#include "base/types.hh" 103#include "config/the_isa.hh" 104#include "cpu/base.hh" 105#include "cpu/thread_context.hh" 106#include "mem/page_table.hh" 107#include "params/Process.hh" 108#include "sim/emul_driver.hh" 109#include "sim/futex_map.hh" 110#include "sim/process.hh" 111#include "sim/syscall_debug_macros.hh" 112#include "sim/syscall_desc.hh" 113#include "sim/syscall_emul_buf.hh" 114#include "sim/syscall_return.hh" 115 116////////////////////////////////////////////////////////////////////// 117// 118// The following emulation functions are generic enough that they 119// don't need to be recompiled for different emulated OS's. They are 120// defined in sim/syscall_emul.cc. 121// 122////////////////////////////////////////////////////////////////////// 123 124 125/// Handler for unimplemented syscalls that we haven't thought about. 126SyscallReturn unimplementedFunc(SyscallDesc *desc, int num, 127 Process *p, ThreadContext *tc); 128 129/// Handler for unimplemented syscalls that we never intend to 130/// implement (signal handling, etc.) and should not affect the correct 131/// behavior of the program. Print a warning only if the appropriate 132/// trace flag is enabled. Return success to the target program. 133SyscallReturn ignoreFunc(SyscallDesc *desc, int num, 134 Process *p, ThreadContext *tc); 135 136// Target fallocateFunc() handler. 137SyscallReturn fallocateFunc(SyscallDesc *desc, int num, 138 Process *p, ThreadContext *tc); 139 140/// Target exit() handler: terminate current context. 141SyscallReturn exitFunc(SyscallDesc *desc, int num, 142 Process *p, ThreadContext *tc); 143 144/// Target exit_group() handler: terminate simulation. (exit all threads) 145SyscallReturn exitGroupFunc(SyscallDesc *desc, int num, 146 Process *p, ThreadContext *tc); 147 148/// Target set_tid_address() handler. 149SyscallReturn setTidAddressFunc(SyscallDesc *desc, int num, 150 Process *p, ThreadContext *tc); 151 152/// Target getpagesize() handler. 153SyscallReturn getpagesizeFunc(SyscallDesc *desc, int num, 154 Process *p, ThreadContext *tc); 155 156/// Target brk() handler: set brk address. 157SyscallReturn brkFunc(SyscallDesc *desc, int num, 158 Process *p, ThreadContext *tc); 159 160/// Target close() handler. 161SyscallReturn closeFunc(SyscallDesc *desc, int num, 162 Process *p, ThreadContext *tc); 163 164// Target read() handler. 165SyscallReturn readFunc(SyscallDesc *desc, int num, 166 Process *p, ThreadContext *tc); 167 168/// Target write() handler. 169SyscallReturn writeFunc(SyscallDesc *desc, int num, 170 Process *p, ThreadContext *tc); 171 172/// Target lseek() handler. 173SyscallReturn lseekFunc(SyscallDesc *desc, int num, 174 Process *p, ThreadContext *tc); 175 176/// Target _llseek() handler. 177SyscallReturn _llseekFunc(SyscallDesc *desc, int num, 178 Process *p, ThreadContext *tc); 179 180/// Target munmap() handler. 181SyscallReturn munmapFunc(SyscallDesc *desc, int num, 182 Process *p, ThreadContext *tc); 183 184/// Target gethostname() handler. 185SyscallReturn gethostnameFunc(SyscallDesc *desc, int num, 186 Process *p, ThreadContext *tc); 187 188/// Target getcwd() handler. 189SyscallReturn getcwdFunc(SyscallDesc *desc, int num, 190 Process *p, ThreadContext *tc); 191 192/// Target readlink() handler. 193SyscallReturn readlinkFunc(SyscallDesc *desc, int num, 194 Process *p, ThreadContext *tc, 195 int index = 0); 196SyscallReturn readlinkFunc(SyscallDesc *desc, int num, 197 Process *p, ThreadContext *tc); 198 199/// Target unlink() handler. 200SyscallReturn unlinkHelper(SyscallDesc *desc, int num, 201 Process *p, ThreadContext *tc, 202 int index); 203SyscallReturn unlinkFunc(SyscallDesc *desc, int num, 204 Process *p, ThreadContext *tc); 205 206/// Target link() handler 207SyscallReturn linkFunc(SyscallDesc *desc, int num, Process *p, 208 ThreadContext *tc); 209 210/// Target symlink() handler. 211SyscallReturn symlinkFunc(SyscallDesc *desc, int num, Process *p, 212 ThreadContext *tc); 213 214/// Target mkdir() handler. 215SyscallReturn mkdirFunc(SyscallDesc *desc, int num, 216 Process *p, ThreadContext *tc); 217 218/// Target mknod() handler. 219SyscallReturn mknodFunc(SyscallDesc *desc, int num, 220 Process *p, ThreadContext *tc); 221 222/// Target chdir() handler. 223SyscallReturn chdirFunc(SyscallDesc *desc, int num, 224 Process *p, ThreadContext *tc); 225 226// Target rmdir() handler. 227SyscallReturn rmdirFunc(SyscallDesc *desc, int num, 228 Process *p, ThreadContext *tc); 229 230/// Target rename() handler. 231SyscallReturn renameFunc(SyscallDesc *desc, int num, 232 Process *p, ThreadContext *tc); 233 234 235/// Target truncate() handler. 236SyscallReturn truncateFunc(SyscallDesc *desc, int num, 237 Process *p, ThreadContext *tc); 238 239 240/// Target ftruncate() handler. 241SyscallReturn ftruncateFunc(SyscallDesc *desc, int num, 242 Process *p, ThreadContext *tc); 243 244 245/// Target truncate64() handler. 246SyscallReturn truncate64Func(SyscallDesc *desc, int num, 247 Process *p, ThreadContext *tc); 248 249/// Target ftruncate64() handler. 250SyscallReturn ftruncate64Func(SyscallDesc *desc, int num, 251 Process *p, ThreadContext *tc); 252 253 254/// Target umask() handler. 255SyscallReturn umaskFunc(SyscallDesc *desc, int num, 256 Process *p, ThreadContext *tc); 257 258/// Target gettid() handler. 259SyscallReturn gettidFunc(SyscallDesc *desc, int num, 260 Process *p, ThreadContext *tc); 261 262/// Target chown() handler. 263SyscallReturn chownFunc(SyscallDesc *desc, int num, 264 Process *p, ThreadContext *tc); 265 266/// Target setpgid() handler. 267SyscallReturn setpgidFunc(SyscallDesc *desc, int num, 268 Process *p, ThreadContext *tc); 269 270/// Target fchown() handler. 271SyscallReturn fchownFunc(SyscallDesc *desc, int num, 272 Process *p, ThreadContext *tc); 273 274/// Target dup() handler. 275SyscallReturn dupFunc(SyscallDesc *desc, int num, 276 Process *process, ThreadContext *tc); 277 278/// Target dup2() handler. 279SyscallReturn dup2Func(SyscallDesc *desc, int num, 280 Process *process, ThreadContext *tc); 281 282/// Target fcntl() handler. 283SyscallReturn fcntlFunc(SyscallDesc *desc, int num, 284 Process *process, ThreadContext *tc); 285 286/// Target fcntl64() handler. 287SyscallReturn fcntl64Func(SyscallDesc *desc, int num, 288 Process *process, ThreadContext *tc); 289 290/// Target setuid() handler. 291SyscallReturn setuidFunc(SyscallDesc *desc, int num, 292 Process *p, ThreadContext *tc); 293 294/// Target pipe() handler. 295SyscallReturn pipeFunc(SyscallDesc *desc, int num, 296 Process *p, ThreadContext *tc); 297 298/// Internal pipe() handler. 299SyscallReturn pipeImpl(SyscallDesc *desc, int num, Process *p, 300 ThreadContext *tc, bool pseudoPipe); 301 302/// Target getpid() handler. 303SyscallReturn getpidFunc(SyscallDesc *desc, int num, 304 Process *p, ThreadContext *tc); 305 306#if defined(SYS_getdents) 307// Target getdents() handler. 308SyscallReturn getdentsFunc(SyscallDesc *desc, int num, 309 Process *p, ThreadContext *tc); 310#endif 311 312// Target getuid() handler. 313SyscallReturn getuidFunc(SyscallDesc *desc, int num, 314 Process *p, ThreadContext *tc); 315 316/// Target getgid() handler. 317SyscallReturn getgidFunc(SyscallDesc *desc, int num, 318 Process *p, ThreadContext *tc); 319 320/// Target getppid() handler. 321SyscallReturn getppidFunc(SyscallDesc *desc, int num, 322 Process *p, ThreadContext *tc); 323 324/// Target geteuid() handler. 325SyscallReturn geteuidFunc(SyscallDesc *desc, int num, 326 Process *p, ThreadContext *tc); 327 328/// Target getegid() handler. 329SyscallReturn getegidFunc(SyscallDesc *desc, int num, 330 Process *p, ThreadContext *tc); 331 332/// Target access() handler 333SyscallReturn accessFunc(SyscallDesc *desc, int num, 334 Process *p, ThreadContext *tc); 335SyscallReturn accessFunc(SyscallDesc *desc, int num, 336 Process *p, ThreadContext *tc, 337 int index); 338 339/// Futex system call 340/// Implemented by Daniel Sanchez 341/// Used by printf's in multi-threaded apps 342template <class OS> 343SyscallReturn 344futexFunc(SyscallDesc *desc, int callnum, Process *process, 345 ThreadContext *tc) 346{ 347 using namespace std; 348 349 int index = 0; 350 Addr uaddr = process->getSyscallArg(tc, index); 351 int op = process->getSyscallArg(tc, index); 352 int val = process->getSyscallArg(tc, index); 353 354 /* 355 * Unsupported option that does not affect the correctness of the 356 * application. This is a performance optimization utilized by Linux. 357 */ 358 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG; 359 360 FutexMap &futex_map = tc->getSystemPtr()->futexMap; 361 362 if (OS::TGT_FUTEX_WAIT == op) { 363 // Ensure futex system call accessed atomically. 364 BufferArg buf(uaddr, sizeof(int)); 365 buf.copyIn(tc->getMemProxy()); 366 int mem_val = *(int*)buf.bufferPtr(); 367 368 /* 369 * The value in memory at uaddr is not equal with the expected val 370 * (a different thread must have changed it before the system call was 371 * invoked). In this case, we need to throw an error. 372 */ 373 if (val != mem_val) 374 return -OS::TGT_EWOULDBLOCK; 375 376 futex_map.suspend(uaddr, process->tgid(), tc); 377 378 return 0; 379 } else if (OS::TGT_FUTEX_WAKE == op) { 380 return futex_map.wakeup(uaddr, process->tgid(), val); 381 } 382 383 warn("futex: op %d not implemented; ignoring.", op); 384 return -ENOSYS; 385} 386 387 388/// Pseudo Funcs - These functions use a different return convension, 389/// returning a second value in a register other than the normal return register 390SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, 391 Process *process, ThreadContext *tc); 392 393/// Target getpidPseudo() handler. 394SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, 395 Process *p, ThreadContext *tc); 396 397/// Target getuidPseudo() handler. 398SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, 399 Process *p, ThreadContext *tc); 400 401/// Target getgidPseudo() handler. 402SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, 403 Process *p, ThreadContext *tc); 404 405 406/// A readable name for 1,000,000, for converting microseconds to seconds. 407const int one_million = 1000000; 408/// A readable name for 1,000,000,000, for converting nanoseconds to seconds. 409const int one_billion = 1000000000; 410 411/// Approximate seconds since the epoch (1/1/1970). About a billion, 412/// by my reckoning. We want to keep this a constant (not use the 413/// real-world time) to keep simulations repeatable. 414const unsigned seconds_since_epoch = 1000000000; 415 416/// Helper function to convert current elapsed time to seconds and 417/// microseconds. 418template <class T1, class T2> 419void 420getElapsedTimeMicro(T1 &sec, T2 &usec) 421{ 422 uint64_t elapsed_usecs = curTick() / SimClock::Int::us; 423 sec = elapsed_usecs / one_million; 424 usec = elapsed_usecs % one_million; 425} 426 427/// Helper function to convert current elapsed time to seconds and 428/// nanoseconds. 429template <class T1, class T2> 430void 431getElapsedTimeNano(T1 &sec, T2 &nsec) 432{ 433 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns; 434 sec = elapsed_nsecs / one_billion; 435 nsec = elapsed_nsecs % one_billion; 436} 437 438////////////////////////////////////////////////////////////////////// 439// 440// The following emulation functions are generic, but need to be 441// templated to account for differences in types, constants, etc. 442// 443////////////////////////////////////////////////////////////////////// 444 445 typedef struct statfs hst_statfs; 446#if NO_STAT64 447 typedef struct stat hst_stat; 448 typedef struct stat hst_stat64; 449#else 450 typedef struct stat hst_stat; 451 typedef struct stat64 hst_stat64; 452#endif 453 454//// Helper function to convert a host stat buffer to a target stat 455//// buffer. Also copies the target buffer out to the simulated 456//// memory space. Used by stat(), fstat(), and lstat(). 457 458template <typename target_stat, typename host_stat> 459void 460convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) 461{ 462 using namespace TheISA; 463 464 if (fakeTTY) 465 tgt->st_dev = 0xA; 466 else 467 tgt->st_dev = host->st_dev; 468 tgt->st_dev = TheISA::htog(tgt->st_dev); 469 tgt->st_ino = host->st_ino; 470 tgt->st_ino = TheISA::htog(tgt->st_ino); 471 tgt->st_mode = host->st_mode; 472 if (fakeTTY) { 473 // Claim to be a character device 474 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT 475 tgt->st_mode |= S_IFCHR; // Set S_IFCHR 476 } 477 tgt->st_mode = TheISA::htog(tgt->st_mode); 478 tgt->st_nlink = host->st_nlink; 479 tgt->st_nlink = TheISA::htog(tgt->st_nlink); 480 tgt->st_uid = host->st_uid; 481 tgt->st_uid = TheISA::htog(tgt->st_uid); 482 tgt->st_gid = host->st_gid; 483 tgt->st_gid = TheISA::htog(tgt->st_gid); 484 if (fakeTTY) 485 tgt->st_rdev = 0x880d; 486 else 487 tgt->st_rdev = host->st_rdev; 488 tgt->st_rdev = TheISA::htog(tgt->st_rdev); 489 tgt->st_size = host->st_size; 490 tgt->st_size = TheISA::htog(tgt->st_size); 491 tgt->st_atimeX = host->st_atime; 492 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX); 493 tgt->st_mtimeX = host->st_mtime; 494 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX); 495 tgt->st_ctimeX = host->st_ctime; 496 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX); 497 // Force the block size to be 8KB. This helps to ensure buffered io works 498 // consistently across different hosts. 499 tgt->st_blksize = 0x2000; 500 tgt->st_blksize = TheISA::htog(tgt->st_blksize); 501 tgt->st_blocks = host->st_blocks; 502 tgt->st_blocks = TheISA::htog(tgt->st_blocks); 503} 504 505// Same for stat64 506 507template <typename target_stat, typename host_stat64> 508void 509convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) 510{ 511 using namespace TheISA; 512 513 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); 514#if defined(STAT_HAVE_NSEC) 515 tgt->st_atime_nsec = host->st_atime_nsec; 516 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec); 517 tgt->st_mtime_nsec = host->st_mtime_nsec; 518 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec); 519 tgt->st_ctime_nsec = host->st_ctime_nsec; 520 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec); 521#else 522 tgt->st_atime_nsec = 0; 523 tgt->st_mtime_nsec = 0; 524 tgt->st_ctime_nsec = 0; 525#endif 526} 527 528// Here are a couple of convenience functions 529template<class OS> 530void 531copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr, 532 hst_stat *host, bool fakeTTY = false) 533{ 534 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; 535 tgt_stat_buf tgt(addr); 536 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); 537 tgt.copyOut(mem); 538} 539 540template<class OS> 541void 542copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr, 543 hst_stat64 *host, bool fakeTTY = false) 544{ 545 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; 546 tgt_stat_buf tgt(addr); 547 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); 548 tgt.copyOut(mem); 549} 550 551template <class OS> 552void 553copyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr, 554 hst_statfs *host) 555{ 556 TypedBufferArg<typename OS::tgt_statfs> tgt(addr); 557 558 tgt->f_type = TheISA::htog(host->f_type); 559#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 560 tgt->f_bsize = TheISA::htog(host->f_iosize); 561#else 562 tgt->f_bsize = TheISA::htog(host->f_bsize); 563#endif 564 tgt->f_blocks = TheISA::htog(host->f_blocks); 565 tgt->f_bfree = TheISA::htog(host->f_bfree); 566 tgt->f_bavail = TheISA::htog(host->f_bavail); 567 tgt->f_files = TheISA::htog(host->f_files); 568 tgt->f_ffree = TheISA::htog(host->f_ffree); 569 memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid)); 570#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 571 tgt->f_namelen = TheISA::htog(host->f_namemax); 572 tgt->f_frsize = TheISA::htog(host->f_bsize); 573#elif defined(__APPLE__) 574 tgt->f_namelen = 0; 575 tgt->f_frsize = 0; 576#else 577 tgt->f_namelen = TheISA::htog(host->f_namelen); 578 tgt->f_frsize = TheISA::htog(host->f_frsize); 579#endif 580#if defined(__linux__) 581 memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare)); 582#else 583 /* 584 * The fields are different sizes per OS. Don't bother with 585 * f_spare or f_reserved on non-Linux for now. 586 */ 587 memset(&tgt->f_spare, 0, sizeof(tgt->f_spare)); 588#endif 589 590 tgt.copyOut(mem); 591} 592 593/// Target ioctl() handler. For the most part, programs call ioctl() 594/// only to find out if their stdout is a tty, to determine whether to 595/// do line or block buffering. We always claim that output fds are 596/// not TTYs to provide repeatable results. 597template <class OS> 598SyscallReturn 599ioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 600{ 601 int index = 0; 602 int tgt_fd = p->getSyscallArg(tc, index); 603 unsigned req = p->getSyscallArg(tc, index); 604 605 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req); 606 607 if (OS::isTtyReq(req)) 608 return -ENOTTY; 609 610 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]); 611 if (!dfdp) 612 return -EBADF; 613 614 /** 615 * If the driver is valid, issue the ioctl through it. Otherwise, 616 * there's an implicit assumption that the device is a TTY type and we 617 * return that we do not have a valid TTY. 618 */ 619 EmulatedDriver *emul_driver = dfdp->getDriver(); 620 if (emul_driver) 621 return emul_driver->ioctl(p, tc, req); 622 623 /** 624 * For lack of a better return code, return ENOTTY. Ideally, we should 625 * return something better here, but at least we issue the warning. 626 */ 627 warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n", 628 tgt_fd, req, tc->pcState()); 629 return -ENOTTY; 630} 631 632template <class OS> 633SyscallReturn 634openImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 635 bool isopenat) 636{ 637 int index = 0; 638 int tgt_dirfd = -1; 639 640 /** 641 * If using the openat variant, read in the target directory file 642 * descriptor from the simulated process. 643 */ 644 if (isopenat) 645 tgt_dirfd = p->getSyscallArg(tc, index); 646 647 /** 648 * Retrieve the simulated process' memory proxy and then read in the path 649 * string from that memory space into the host's working memory space. 650 */ 651 std::string path; 652 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 653 return -EFAULT; 654 655#ifdef __CYGWIN32__ 656 int host_flags = O_BINARY; 657#else 658 int host_flags = 0; 659#endif 660 /** 661 * Translate target flags into host flags. Flags exist which are not 662 * ported between architectures which can cause check failures. 663 */ 664 int tgt_flags = p->getSyscallArg(tc, index); 665 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { 666 if (tgt_flags & OS::openFlagTable[i].tgtFlag) { 667 tgt_flags &= ~OS::openFlagTable[i].tgtFlag; 668 host_flags |= OS::openFlagTable[i].hostFlag; 669 } 670 } 671 if (tgt_flags) { 672 warn("open%s: cannot decode flags 0x%x", 673 isopenat ? "at" : "", tgt_flags); 674 } 675#ifdef __CYGWIN32__ 676 host_flags |= O_BINARY; 677#endif 678 679 int mode = p->getSyscallArg(tc, index); 680 681 /** 682 * If the simulated process called open or openat with AT_FDCWD specified, 683 * take the current working directory value which was passed into the 684 * process class as a Python parameter and append the current path to 685 * create a full path. 686 * Otherwise, openat with a valid target directory file descriptor has 687 * been called. If the path option, which was passed in as a parameter, 688 * is not absolute, retrieve the directory file descriptor's path and 689 * prepend it to the path passed in as a parameter. 690 * In every case, we should have a full path (which is relevant to the 691 * host) to work with after this block has been passed. 692 */ 693 if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) { 694 path = p->fullPath(path); 695 } else if (!startswith(path, "/")) { 696 std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]); 697 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 698 if (!ffdp) 699 return -EBADF; 700 path.insert(0, ffdp->getFileName() + "/"); 701 } 702 703 /** 704 * Since this is an emulated environment, we create pseudo file 705 * descriptors for device requests that have been registered with 706 * the process class through Python; this allows us to create a file 707 * descriptor for subsequent ioctl or mmap calls. 708 */ 709 if (startswith(path, "/dev/")) { 710 std::string filename = path.substr(strlen("/dev/")); 711 EmulatedDriver *drv = p->findDriver(filename); 712 if (drv) { 713 DPRINTF_SYSCALL(Verbose, "open%s: passing call to " 714 "driver open with path[%s]\n", 715 isopenat ? "at" : "", path.c_str()); 716 return drv->open(p, tc, mode, host_flags); 717 } 718 /** 719 * Fall through here for pass through to host devices, such 720 * as /dev/zero 721 */ 722 } 723 724 /** 725 * Some special paths and files cannot be called on the host and need 726 * to be handled as special cases inside the simulator. 727 * If the full path that was created above does not match any of the 728 * special cases, pass it through to the open call on the host to let 729 * the host open the file on our behalf. 730 * If the host cannot open the file, return the host's error code back 731 * through the system call to the simulated process. 732 */ 733 int sim_fd = -1; 734 std::vector<std::string> special_paths = 735 { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" }; 736 for (auto entry : special_paths) { 737 if (startswith(path, entry)) 738 sim_fd = OS::openSpecialFile(path, p, tc); 739 } 740 if (sim_fd == -1) { 741 sim_fd = open(path.c_str(), host_flags, mode); 742 } 743 if (sim_fd == -1) { 744 int local = -errno; 745 DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n", 746 isopenat ? "at" : "", path.c_str()); 747 return local; 748 } 749 750 /** 751 * The file was opened successfully and needs to be recorded in the 752 * process' file descriptor array so that it can be retrieved later. 753 * The target file descriptor that is chosen will be the lowest unused 754 * file descriptor. 755 * Return the indirect target file descriptor back to the simulated 756 * process to act as a handle for the opened file. 757 */ 758 auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0); 759 int tgt_fd = p->fds->allocFD(ffdp); 760 DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n", 761 isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str()); 762 return tgt_fd; 763} 764 765/// Target open() handler. 766template <class OS> 767SyscallReturn 768openFunc(SyscallDesc *desc, int callnum, Process *process, 769 ThreadContext *tc) 770{ 771 return openImpl<OS>(desc, callnum, process, tc, false); 772} 773 774/// Target openat() handler. 775template <class OS> 776SyscallReturn 777openatFunc(SyscallDesc *desc, int callnum, Process *process, 778 ThreadContext *tc) 779{ 780 return openImpl<OS>(desc, callnum, process, tc, true); 781} 782 783/// Target unlinkat() handler. 784template <class OS> 785SyscallReturn 786unlinkatFunc(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("unlinkat: first argument not AT_FDCWD; unlikely to work"); 793 794 return unlinkHelper(desc, callnum, process, tc, 1); 795} 796 797/// Target facessat() handler 798template <class OS> 799SyscallReturn 800faccessatFunc(SyscallDesc *desc, int callnum, Process *process, 801 ThreadContext *tc) 802{ 803 int index = 0; 804 int dirfd = process->getSyscallArg(tc, index); 805 if (dirfd != OS::TGT_AT_FDCWD) 806 warn("faccessat: first argument not AT_FDCWD; unlikely to work"); 807 return accessFunc(desc, callnum, process, tc, 1); 808} 809 810/// Target readlinkat() handler 811template <class OS> 812SyscallReturn 813readlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 814 ThreadContext *tc) 815{ 816 int index = 0; 817 int dirfd = process->getSyscallArg(tc, index); 818 if (dirfd != OS::TGT_AT_FDCWD) 819 warn("openat: first argument not AT_FDCWD; unlikely to work"); 820 return readlinkFunc(desc, callnum, process, tc, 1); 821} 822 823/// Target renameat() handler. 824template <class OS> 825SyscallReturn 826renameatFunc(SyscallDesc *desc, int callnum, Process *process, 827 ThreadContext *tc) 828{ 829 int index = 0; 830 831 int olddirfd = process->getSyscallArg(tc, index); 832 if (olddirfd != OS::TGT_AT_FDCWD) 833 warn("renameat: first argument not AT_FDCWD; unlikely to work"); 834 835 std::string old_name; 836 837 if (!tc->getMemProxy().tryReadString(old_name, 838 process->getSyscallArg(tc, index))) 839 return -EFAULT; 840 841 int newdirfd = process->getSyscallArg(tc, index); 842 if (newdirfd != OS::TGT_AT_FDCWD) 843 warn("renameat: third argument not AT_FDCWD; unlikely to work"); 844 845 std::string new_name; 846 847 if (!tc->getMemProxy().tryReadString(new_name, 848 process->getSyscallArg(tc, index))) 849 return -EFAULT; 850 851 // Adjust path for current working directory 852 old_name = process->fullPath(old_name); 853 new_name = process->fullPath(new_name); 854 855 int result = rename(old_name.c_str(), new_name.c_str()); 856 return (result == -1) ? -errno : result; 857} 858 859/// Target sysinfo() handler. 860template <class OS> 861SyscallReturn 862sysinfoFunc(SyscallDesc *desc, int callnum, Process *process, 863 ThreadContext *tc) 864{ 865 866 int index = 0; 867 TypedBufferArg<typename OS::tgt_sysinfo> 868 sysinfo(process->getSyscallArg(tc, index)); 869 870 sysinfo->uptime = seconds_since_epoch; 871 sysinfo->totalram = process->system->memSize(); 872 sysinfo->mem_unit = 1; 873 874 sysinfo.copyOut(tc->getMemProxy()); 875 876 return 0; 877} 878 879/// Target chmod() handler. 880template <class OS> 881SyscallReturn 882chmodFunc(SyscallDesc *desc, int callnum, Process *process, 883 ThreadContext *tc) 884{ 885 std::string path; 886 887 int index = 0; 888 if (!tc->getMemProxy().tryReadString(path, 889 process->getSyscallArg(tc, index))) { 890 return -EFAULT; 891 } 892 893 uint32_t mode = process->getSyscallArg(tc, index); 894 mode_t hostMode = 0; 895 896 // XXX translate mode flags via OS::something??? 897 hostMode = mode; 898 899 // Adjust path for current working directory 900 path = process->fullPath(path); 901 902 // do the chmod 903 int result = chmod(path.c_str(), hostMode); 904 if (result < 0) 905 return -errno; 906 907 return 0; 908} 909 910 911/// Target fchmod() handler. 912template <class OS> 913SyscallReturn 914fchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 915{ 916 int index = 0; 917 int tgt_fd = p->getSyscallArg(tc, index); 918 uint32_t mode = p->getSyscallArg(tc, index); 919 920 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 921 if (!ffdp) 922 return -EBADF; 923 int sim_fd = ffdp->getSimFD(); 924 925 mode_t hostMode = mode; 926 927 int result = fchmod(sim_fd, hostMode); 928 929 return (result < 0) ? -errno : 0; 930} 931 932/// Target mremap() handler. 933template <class OS> 934SyscallReturn 935mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 936{ 937 int index = 0; 938 Addr start = process->getSyscallArg(tc, index); 939 uint64_t old_length = process->getSyscallArg(tc, index); 940 uint64_t new_length = process->getSyscallArg(tc, index); 941 uint64_t flags = process->getSyscallArg(tc, index); 942 uint64_t provided_address = 0; 943 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED; 944 945 if (use_provided_address) 946 provided_address = process->getSyscallArg(tc, index); 947 948 if ((start % TheISA::PageBytes != 0) || 949 (provided_address % TheISA::PageBytes != 0)) { 950 warn("mremap failing: arguments not page aligned"); 951 return -EINVAL; 952 } 953 954 new_length = roundUp(new_length, TheISA::PageBytes); 955 956 if (new_length > old_length) { 957 std::shared_ptr<MemState> mem_state = process->memState; 958 Addr mmap_end = mem_state->getMmapEnd(); 959 960 if ((start + old_length) == mmap_end && 961 (!use_provided_address || provided_address == start)) { 962 // This case cannot occur when growing downward, as 963 // start is greater than or equal to mmap_end. 964 uint64_t diff = new_length - old_length; 965 process->allocateMem(mmap_end, diff); 966 mem_state->setMmapEnd(mmap_end + diff); 967 return start; 968 } else { 969 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) { 970 warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); 971 return -ENOMEM; 972 } else { 973 uint64_t new_start = provided_address; 974 if (!use_provided_address) { 975 new_start = process->mmapGrowsDown() ? 976 mmap_end - new_length : mmap_end; 977 mmap_end = process->mmapGrowsDown() ? 978 new_start : mmap_end + new_length; 979 mem_state->setMmapEnd(mmap_end); 980 } 981 982 process->pTable->remap(start, old_length, new_start); 983 warn("mremapping to new vaddr %08p-%08p, adding %d\n", 984 new_start, new_start + new_length, 985 new_length - old_length); 986 // add on the remaining unallocated pages 987 process->allocateMem(new_start + old_length, 988 new_length - old_length, 989 use_provided_address /* clobber */); 990 if (use_provided_address && 991 ((new_start + new_length > mem_state->getMmapEnd() && 992 !process->mmapGrowsDown()) || 993 (new_start < mem_state->getMmapEnd() && 994 process->mmapGrowsDown()))) { 995 // something fishy going on here, at least notify the user 996 // @todo: increase mmap_end? 997 warn("mmap region limit exceeded with MREMAP_FIXED\n"); 998 } 999 warn("returning %08p as start\n", new_start); 1000 return new_start; 1001 } 1002 } 1003 } else { 1004 if (use_provided_address && provided_address != start) 1005 process->pTable->remap(start, new_length, provided_address); 1006 process->pTable->unmap(start + new_length, old_length - new_length); 1007 return use_provided_address ? provided_address : start; 1008 } 1009} 1010 1011/// Target stat() handler. 1012template <class OS> 1013SyscallReturn 1014statFunc(SyscallDesc *desc, int callnum, Process *process, 1015 ThreadContext *tc) 1016{ 1017 std::string path; 1018 1019 int index = 0; 1020 if (!tc->getMemProxy().tryReadString(path, 1021 process->getSyscallArg(tc, index))) { 1022 return -EFAULT; 1023 } 1024 Addr bufPtr = process->getSyscallArg(tc, index); 1025 1026 // Adjust path for current working directory 1027 path = process->fullPath(path); 1028 1029 struct stat hostBuf; 1030 int result = stat(path.c_str(), &hostBuf); 1031 1032 if (result < 0) 1033 return -errno; 1034 1035 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1036 1037 return 0; 1038} 1039 1040 1041/// Target stat64() handler. 1042template <class OS> 1043SyscallReturn 1044stat64Func(SyscallDesc *desc, int callnum, Process *process, 1045 ThreadContext *tc) 1046{ 1047 std::string path; 1048 1049 int index = 0; 1050 if (!tc->getMemProxy().tryReadString(path, 1051 process->getSyscallArg(tc, index))) 1052 return -EFAULT; 1053 Addr bufPtr = process->getSyscallArg(tc, index); 1054 1055 // Adjust path for current working directory 1056 path = process->fullPath(path); 1057 1058#if NO_STAT64 1059 struct stat hostBuf; 1060 int result = stat(path.c_str(), &hostBuf); 1061#else 1062 struct stat64 hostBuf; 1063 int result = stat64(path.c_str(), &hostBuf); 1064#endif 1065 1066 if (result < 0) 1067 return -errno; 1068 1069 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1070 1071 return 0; 1072} 1073 1074 1075/// Target fstatat64() handler. 1076template <class OS> 1077SyscallReturn 1078fstatat64Func(SyscallDesc *desc, int callnum, Process *process, 1079 ThreadContext *tc) 1080{ 1081 int index = 0; 1082 int dirfd = process->getSyscallArg(tc, index); 1083 if (dirfd != OS::TGT_AT_FDCWD) 1084 warn("fstatat64: first argument not AT_FDCWD; unlikely to work"); 1085 1086 std::string path; 1087 if (!tc->getMemProxy().tryReadString(path, 1088 process->getSyscallArg(tc, index))) 1089 return -EFAULT; 1090 Addr bufPtr = process->getSyscallArg(tc, index); 1091 1092 // Adjust path for current working directory 1093 path = process->fullPath(path); 1094 1095#if NO_STAT64 1096 struct stat hostBuf; 1097 int result = stat(path.c_str(), &hostBuf); 1098#else 1099 struct stat64 hostBuf; 1100 int result = stat64(path.c_str(), &hostBuf); 1101#endif 1102 1103 if (result < 0) 1104 return -errno; 1105 1106 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1107 1108 return 0; 1109} 1110 1111 1112/// Target fstat64() handler. 1113template <class OS> 1114SyscallReturn 1115fstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1116{ 1117 int index = 0; 1118 int tgt_fd = p->getSyscallArg(tc, index); 1119 Addr bufPtr = p->getSyscallArg(tc, index); 1120 1121 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1122 if (!ffdp) 1123 return -EBADF; 1124 int sim_fd = ffdp->getSimFD(); 1125 1126#if NO_STAT64 1127 struct stat hostBuf; 1128 int result = fstat(sim_fd, &hostBuf); 1129#else 1130 struct stat64 hostBuf; 1131 int result = fstat64(sim_fd, &hostBuf); 1132#endif 1133 1134 if (result < 0) 1135 return -errno; 1136 1137 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1138 1139 return 0; 1140} 1141 1142 1143/// Target lstat() handler. 1144template <class OS> 1145SyscallReturn 1146lstatFunc(SyscallDesc *desc, int callnum, Process *process, 1147 ThreadContext *tc) 1148{ 1149 std::string path; 1150 1151 int index = 0; 1152 if (!tc->getMemProxy().tryReadString(path, 1153 process->getSyscallArg(tc, index))) { 1154 return -EFAULT; 1155 } 1156 Addr bufPtr = process->getSyscallArg(tc, index); 1157 1158 // Adjust path for current working directory 1159 path = process->fullPath(path); 1160 1161 struct stat hostBuf; 1162 int result = lstat(path.c_str(), &hostBuf); 1163 1164 if (result < 0) 1165 return -errno; 1166 1167 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1168 1169 return 0; 1170} 1171 1172/// Target lstat64() handler. 1173template <class OS> 1174SyscallReturn 1175lstat64Func(SyscallDesc *desc, int callnum, Process *process, 1176 ThreadContext *tc) 1177{ 1178 std::string path; 1179 1180 int index = 0; 1181 if (!tc->getMemProxy().tryReadString(path, 1182 process->getSyscallArg(tc, index))) { 1183 return -EFAULT; 1184 } 1185 Addr bufPtr = process->getSyscallArg(tc, index); 1186 1187 // Adjust path for current working directory 1188 path = process->fullPath(path); 1189 1190#if NO_STAT64 1191 struct stat hostBuf; 1192 int result = lstat(path.c_str(), &hostBuf); 1193#else 1194 struct stat64 hostBuf; 1195 int result = lstat64(path.c_str(), &hostBuf); 1196#endif 1197 1198 if (result < 0) 1199 return -errno; 1200 1201 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1202 1203 return 0; 1204} 1205 1206/// Target fstat() handler. 1207template <class OS> 1208SyscallReturn 1209fstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1210{ 1211 int index = 0; 1212 int tgt_fd = p->getSyscallArg(tc, index); 1213 Addr bufPtr = p->getSyscallArg(tc, index); 1214 1215 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd); 1216 1217 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1218 if (!ffdp) 1219 return -EBADF; 1220 int sim_fd = ffdp->getSimFD(); 1221 1222 struct stat hostBuf; 1223 int result = fstat(sim_fd, &hostBuf); 1224 1225 if (result < 0) 1226 return -errno; 1227 1228 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1229 1230 return 0; 1231} 1232 1233 1234/// Target statfs() handler. 1235template <class OS> 1236SyscallReturn 1237statfsFunc(SyscallDesc *desc, int callnum, Process *process, 1238 ThreadContext *tc) 1239{ 1240#if NO_STATFS 1241 warn("Host OS cannot support calls to statfs. Ignoring syscall"); 1242#else 1243 std::string path; 1244 1245 int index = 0; 1246 if (!tc->getMemProxy().tryReadString(path, 1247 process->getSyscallArg(tc, index))) { 1248 return -EFAULT; 1249 } 1250 Addr bufPtr = process->getSyscallArg(tc, index); 1251 1252 // Adjust path for current working directory 1253 path = process->fullPath(path); 1254 1255 struct statfs hostBuf; 1256 int result = statfs(path.c_str(), &hostBuf); 1257 1258 if (result < 0) 1259 return -errno; 1260 1261 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1262#endif 1263 return 0; 1264} 1265 1266template <class OS> 1267SyscallReturn 1268cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1269{ 1270 int index = 0; 1271 1272 TheISA::IntReg flags = p->getSyscallArg(tc, index); 1273 TheISA::IntReg newStack = p->getSyscallArg(tc, index); 1274 Addr ptidPtr = p->getSyscallArg(tc, index); 1275 1276#if THE_ISA == RISCV_ISA 1277 /** 1278 * Linux kernel 4.15 sets CLONE_BACKWARDS flag for RISC-V. 1279 * The flag defines the list of clone() arguments in the following 1280 * order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr 1281 */ 1282 Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index); 1283 Addr ctidPtr = p->getSyscallArg(tc, index); 1284#else 1285 Addr ctidPtr = p->getSyscallArg(tc, index); 1286 Addr tlsPtr M5_VAR_USED = p->getSyscallArg(tc, index); 1287#endif 1288 1289 if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) || 1290 ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) || 1291 ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) || 1292 ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) || 1293 ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) || 1294 ((flags & OS::TGT_CLONE_VM) && !(newStack))) 1295 return -EINVAL; 1296 1297 ThreadContext *ctc; 1298 if (!(ctc = p->findFreeContext())) 1299 fatal("clone: no spare thread context in system"); 1300 1301 /** 1302 * Note that ProcessParams is generated by swig and there are no other 1303 * examples of how to create anything but this default constructor. The 1304 * fields are manually initialized instead of passing parameters to the 1305 * constructor. 1306 */ 1307 ProcessParams *pp = new ProcessParams(); 1308 pp->executable.assign(*(new std::string(p->progName()))); 1309 pp->cmd.push_back(*(new std::string(p->progName()))); 1310 pp->system = p->system; 1311 pp->cwd.assign(p->getcwd()); 1312 pp->input.assign("stdin"); 1313 pp->output.assign("stdout"); 1314 pp->errout.assign("stderr"); 1315 pp->uid = p->uid(); 1316 pp->euid = p->euid(); 1317 pp->gid = p->gid(); 1318 pp->egid = p->egid(); 1319 1320 /* Find the first free PID that's less than the maximum */ 1321 std::set<int> const& pids = p->system->PIDs; 1322 int temp_pid = *pids.begin(); 1323 do { 1324 temp_pid++; 1325 } while (pids.find(temp_pid) != pids.end()); 1326 if (temp_pid >= System::maxPID) 1327 fatal("temp_pid is too large: %d", temp_pid); 1328 1329 pp->pid = temp_pid; 1330 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid(); 1331 Process *cp = pp->create(); 1332 delete pp; 1333 1334 Process *owner = ctc->getProcessPtr(); 1335 ctc->setProcessPtr(cp); 1336 cp->assignThreadContext(ctc->contextId()); 1337 owner->revokeThreadContext(ctc->contextId()); 1338 1339 if (flags & OS::TGT_CLONE_PARENT_SETTID) { 1340 BufferArg ptidBuf(ptidPtr, sizeof(long)); 1341 long *ptid = (long *)ptidBuf.bufferPtr(); 1342 *ptid = cp->pid(); 1343 ptidBuf.copyOut(tc->getMemProxy()); 1344 } 1345 1346 cp->initState(); 1347 p->clone(tc, ctc, cp, flags); 1348 1349 if (flags & OS::TGT_CLONE_THREAD) { 1350 delete cp->sigchld; 1351 cp->sigchld = p->sigchld; 1352 } else if (flags & OS::TGT_SIGCHLD) { 1353 *cp->sigchld = true; 1354 } 1355 1356 if (flags & OS::TGT_CLONE_CHILD_SETTID) { 1357 BufferArg ctidBuf(ctidPtr, sizeof(long)); 1358 long *ctid = (long *)ctidBuf.bufferPtr(); 1359 *ctid = cp->pid(); 1360 ctidBuf.copyOut(ctc->getMemProxy()); 1361 } 1362 1363 if (flags & OS::TGT_CLONE_CHILD_CLEARTID) 1364 cp->childClearTID = (uint64_t)ctidPtr; 1365 1366 ctc->clearArchRegs(); 1367 1368#if THE_ISA == ALPHA_ISA 1369 TheISA::copyMiscRegs(tc, ctc); 1370#elif THE_ISA == SPARC_ISA 1371 TheISA::copyRegs(tc, ctc); 1372 ctc->setIntReg(TheISA::NumIntArchRegs + 6, 0); 1373 ctc->setIntReg(TheISA::NumIntArchRegs + 4, 0); 1374 ctc->setIntReg(TheISA::NumIntArchRegs + 3, TheISA::NWindows - 2); 1375 ctc->setIntReg(TheISA::NumIntArchRegs + 5, TheISA::NWindows); 1376 ctc->setMiscReg(TheISA::MISCREG_CWP, 0); 1377 ctc->setIntReg(TheISA::NumIntArchRegs + 7, 0); 1378 ctc->setMiscRegNoEffect(TheISA::MISCREG_TL, 0); 1379 ctc->setMiscReg(TheISA::MISCREG_ASI, TheISA::ASI_PRIMARY); 1380 for (int y = 8; y < 32; y++) 1381 ctc->setIntReg(y, tc->readIntReg(y)); 1382#elif THE_ISA == ARM_ISA or THE_ISA == X86_ISA or THE_ISA == RISCV_ISA 1383 TheISA::copyRegs(tc, ctc); 1384#endif 1385 1386#if THE_ISA == X86_ISA 1387 if (flags & OS::TGT_CLONE_SETTLS) { 1388 ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_BASE, tlsPtr); 1389 ctc->setMiscRegNoEffect(TheISA::MISCREG_FS_EFF_BASE, tlsPtr); 1390 } 1391#endif 1392 1393 if (newStack) 1394 ctc->setIntReg(TheISA::StackPointerReg, newStack); 1395 1396 cp->setSyscallReturn(ctc, 0); 1397 1398#if THE_ISA == ALPHA_ISA 1399 ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 1400#elif THE_ISA == SPARC_ISA 1401 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 1402 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 1403#endif 1404 1405 ctc->pcState(tc->nextInstAddr()); 1406 ctc->activate(); 1407 1408 return cp->pid(); 1409} 1410 1411/// Target fstatfs() handler. 1412template <class OS> 1413SyscallReturn 1414fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1415{ 1416 int index = 0; 1417 int tgt_fd = p->getSyscallArg(tc, index); 1418 Addr bufPtr = p->getSyscallArg(tc, index); 1419 1420 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1421 if (!ffdp) 1422 return -EBADF; 1423 int sim_fd = ffdp->getSimFD(); 1424 1425 struct statfs hostBuf; 1426 int result = fstatfs(sim_fd, &hostBuf); 1427 1428 if (result < 0) 1429 return -errno; 1430 1431 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1432 1433 return 0; 1434} 1435 1436 1437/// Target writev() handler. 1438template <class OS> 1439SyscallReturn 1440writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1441{ 1442 int index = 0; 1443 int tgt_fd = p->getSyscallArg(tc, index); 1444 1445 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 1446 if (!hbfdp) 1447 return -EBADF; 1448 int sim_fd = hbfdp->getSimFD(); 1449 1450 SETranslatingPortProxy &prox = tc->getMemProxy(); 1451 uint64_t tiov_base = p->getSyscallArg(tc, index); 1452 size_t count = p->getSyscallArg(tc, index); 1453 struct iovec hiov[count]; 1454 for (size_t i = 0; i < count; ++i) { 1455 typename OS::tgt_iovec tiov; 1456 1457 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), 1458 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); 1459 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len); 1460 hiov[i].iov_base = new char [hiov[i].iov_len]; 1461 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, 1462 hiov[i].iov_len); 1463 } 1464 1465 int result = writev(sim_fd, hiov, count); 1466 1467 for (size_t i = 0; i < count; ++i) 1468 delete [] (char *)hiov[i].iov_base; 1469 1470 if (result < 0) 1471 return -errno; 1472 1473 return result; 1474} 1475 1476/// Real mmap handler. 1477template <class OS> 1478SyscallReturn 1479mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 1480 bool is_mmap2) 1481{ 1482 int index = 0; 1483 Addr start = p->getSyscallArg(tc, index); 1484 uint64_t length = p->getSyscallArg(tc, index); 1485 int prot = p->getSyscallArg(tc, index); 1486 int tgt_flags = p->getSyscallArg(tc, index); 1487 int tgt_fd = p->getSyscallArg(tc, index); 1488 int offset = p->getSyscallArg(tc, index); 1489 1490 if (is_mmap2) 1491 offset *= TheISA::PageBytes; 1492 1493 if (start & (TheISA::PageBytes - 1) || 1494 offset & (TheISA::PageBytes - 1) || 1495 (tgt_flags & OS::TGT_MAP_PRIVATE && 1496 tgt_flags & OS::TGT_MAP_SHARED) || 1497 (!(tgt_flags & OS::TGT_MAP_PRIVATE) && 1498 !(tgt_flags & OS::TGT_MAP_SHARED)) || 1499 !length) { 1500 return -EINVAL; 1501 } 1502 1503 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) { 1504 // With shared mmaps, there are two cases to consider: 1505 // 1) anonymous: writes should modify the mapping and this should be 1506 // visible to observers who share the mapping. Currently, it's 1507 // difficult to update the shared mapping because there's no 1508 // structure which maintains information about the which virtual 1509 // memory areas are shared. If that structure existed, it would be 1510 // possible to make the translations point to the same frames. 1511 // 2) file-backed: writes should modify the mapping and the file 1512 // which is backed by the mapping. The shared mapping problem is the 1513 // same as what was mentioned about the anonymous mappings. For 1514 // file-backed mappings, the writes to the file are difficult 1515 // because it requires syncing what the mapping holds with the file 1516 // that resides on the host system. So, any write on a real system 1517 // would cause the change to be propagated to the file mapping at 1518 // some point in the future (the inode is tracked along with the 1519 // mapping). This isn't guaranteed to always happen, but it usually 1520 // works well enough. The guarantee is provided by the msync system 1521 // call. We could force the change through with shared mappings with 1522 // a call to msync, but that again would require more information 1523 // than we currently maintain. 1524 warn("mmap: writing to shared mmap region is currently " 1525 "unsupported. The write succeeds on the target, but it " 1526 "will not be propagated to the host or shared mappings"); 1527 } 1528 1529 length = roundUp(length, TheISA::PageBytes); 1530 1531 int sim_fd = -1; 1532 uint8_t *pmap = nullptr; 1533 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) { 1534 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1535 1536 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep); 1537 if (dfdp) { 1538 EmulatedDriver *emul_driver = dfdp->getDriver(); 1539 return emul_driver->mmap(p, tc, start, length, prot, 1540 tgt_flags, tgt_fd, offset); 1541 } 1542 1543 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1544 if (!ffdp) 1545 return -EBADF; 1546 sim_fd = ffdp->getSimFD(); 1547 1548 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE, 1549 sim_fd, offset); 1550 1551 if (pmap == (decltype(pmap))-1) { 1552 warn("mmap: failed to map file into host address space"); 1553 return -errno; 1554 } 1555 } 1556 1557 // Extend global mmap region if necessary. Note that we ignore the 1558 // start address unless MAP_FIXED is specified. 1559 if (!(tgt_flags & OS::TGT_MAP_FIXED)) { 1560 std::shared_ptr<MemState> mem_state = p->memState; 1561 Addr mmap_end = mem_state->getMmapEnd(); 1562 1563 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end; 1564 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length; 1565 1566 mem_state->setMmapEnd(mmap_end); 1567 } 1568 1569 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n", 1570 start, start + length - 1); 1571 1572 // We only allow mappings to overwrite existing mappings if 1573 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem 1574 // because we ignore the start hint if TGT_MAP_FIXED is not set. 1575 int clobber = tgt_flags & OS::TGT_MAP_FIXED; 1576 if (clobber) { 1577 for (auto tc : p->system->threadContexts) { 1578 // If we might be overwriting old mappings, we need to 1579 // invalidate potentially stale mappings out of the TLBs. 1580 tc->getDTBPtr()->flushAll(); 1581 tc->getITBPtr()->flushAll(); 1582 } 1583 } 1584 1585 // Allocate physical memory and map it in. If the page table is already 1586 // mapped and clobber is not set, the simulator will issue throw a 1587 // fatal and bail out of the simulation. 1588 p->allocateMem(start, length, clobber); 1589 1590 // Transfer content into target address space. 1591 SETranslatingPortProxy &tp = tc->getMemProxy(); 1592 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) { 1593 // In general, we should zero the mapped area for anonymous mappings, 1594 // with something like: 1595 // tp.memsetBlob(start, 0, length); 1596 // However, given that we don't support sparse mappings, and 1597 // some applications can map a couple of gigabytes of space 1598 // (intending sparse usage), that can get painfully expensive. 1599 // Fortunately, since we don't properly implement munmap either, 1600 // there's no danger of remapping used memory, so for now all 1601 // newly mapped memory should already be zeroed so we can skip it. 1602 } else { 1603 // It is possible to mmap an area larger than a file, however 1604 // accessing unmapped portions the system triggers a "Bus error" 1605 // on the host. We must know when to stop copying the file from 1606 // the host into the target address space. 1607 struct stat file_stat; 1608 if (fstat(sim_fd, &file_stat) > 0) 1609 fatal("mmap: cannot stat file"); 1610 1611 // Copy the portion of the file that is resident. This requires 1612 // checking both the mmap size and the filesize that we are 1613 // trying to mmap into this space; the mmap size also depends 1614 // on the specified offset into the file. 1615 uint64_t size = std::min((uint64_t)file_stat.st_size - offset, 1616 length); 1617 tp.writeBlob(start, pmap, size); 1618 1619 // Cleanup the mmap region before exiting this function. 1620 munmap(pmap, length); 1621 1622 // Maintain the symbol table for dynamic executables. 1623 // The loader will call mmap to map the images into its address 1624 // space and we intercept that here. We can verify that we are 1625 // executing inside the loader by checking the program counter value. 1626 // XXX: with multiprogrammed workloads or multi-node configurations, 1627 // this will not work since there is a single global symbol table. 1628 ObjectFile *interpreter = p->getInterpreter(); 1629 if (interpreter) { 1630 Addr text_start = interpreter->textBase(); 1631 Addr text_end = text_start + interpreter->textSize(); 1632 1633 Addr pc = tc->pcState().pc(); 1634 1635 if (pc >= text_start && pc < text_end) { 1636 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1637 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1638 ObjectFile *lib = createObjectFile(ffdp->getFileName()); 1639 1640 if (lib) { 1641 lib->loadAllSymbols(debugSymbolTable, 1642 lib->textBase(), start); 1643 } 1644 } 1645 } 1646 1647 // Note that we do not zero out the remainder of the mapping. This 1648 // is done by a real system, but it probably will not affect 1649 // execution (hopefully). 1650 } 1651 1652 return start; 1653} 1654 1655template <class OS> 1656SyscallReturn 1657pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1658{ 1659 int index = 0; 1660 int tgt_fd = p->getSyscallArg(tc, index); 1661 Addr bufPtr = p->getSyscallArg(tc, index); 1662 int nbytes = p->getSyscallArg(tc, index); 1663 int offset = p->getSyscallArg(tc, index); 1664 1665 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1666 if (!ffdp) 1667 return -EBADF; 1668 int sim_fd = ffdp->getSimFD(); 1669 1670 BufferArg bufArg(bufPtr, nbytes); 1671 bufArg.copyIn(tc->getMemProxy()); 1672 1673 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset); 1674 1675 return (bytes_written == -1) ? -errno : bytes_written; 1676} 1677 1678/// Target mmap() handler. 1679template <class OS> 1680SyscallReturn 1681mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1682{ 1683 return mmapImpl<OS>(desc, num, p, tc, false); 1684} 1685 1686/// Target mmap2() handler. 1687template <class OS> 1688SyscallReturn 1689mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1690{ 1691 return mmapImpl<OS>(desc, num, p, tc, true); 1692} 1693 1694/// Target getrlimit() handler. 1695template <class OS> 1696SyscallReturn 1697getrlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1698 ThreadContext *tc) 1699{ 1700 int index = 0; 1701 unsigned resource = process->getSyscallArg(tc, index); 1702 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index)); 1703 1704 switch (resource) { 1705 case OS::TGT_RLIMIT_STACK: 1706 // max stack size in bytes: make up a number (8MB for now) 1707 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1708 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1709 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1710 break; 1711 1712 case OS::TGT_RLIMIT_DATA: 1713 // max data segment size in bytes: make up a number 1714 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; 1715 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1716 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1717 break; 1718 1719 default: 1720 warn("getrlimit: unimplemented resource %d", resource); 1721 return -EINVAL; 1722 break; 1723 } 1724 1725 rlp.copyOut(tc->getMemProxy()); 1726 return 0; 1727} 1728 1729template <class OS> 1730SyscallReturn 1731prlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1732 ThreadContext *tc) 1733{ 1734 int index = 0; 1735 if (process->getSyscallArg(tc, index) != 0) 1736 { 1737 warn("prlimit: ignoring rlimits for nonzero pid"); 1738 return -EPERM; 1739 } 1740 int resource = process->getSyscallArg(tc, index); 1741 Addr n = process->getSyscallArg(tc, index); 1742 if (n != 0) 1743 warn("prlimit: ignoring new rlimit"); 1744 Addr o = process->getSyscallArg(tc, index); 1745 if (o != 0) 1746 { 1747 TypedBufferArg<typename OS::rlimit> rlp(o); 1748 switch (resource) { 1749 case OS::TGT_RLIMIT_STACK: 1750 // max stack size in bytes: make up a number (8MB for now) 1751 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1752 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1753 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1754 break; 1755 case OS::TGT_RLIMIT_DATA: 1756 // max data segment size in bytes: make up a number 1757 rlp->rlim_cur = rlp->rlim_max = 256*1024*1024; 1758 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1759 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1760 break; 1761 default: 1762 warn("prlimit: unimplemented resource %d", resource); 1763 return -EINVAL; 1764 break; 1765 } 1766 rlp.copyOut(tc->getMemProxy()); 1767 } 1768 return 0; 1769} 1770 1771/// Target clock_gettime() function. 1772template <class OS> 1773SyscallReturn 1774clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1775{ 1776 int index = 1; 1777 //int clk_id = p->getSyscallArg(tc, index); 1778 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1779 1780 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec); 1781 tp->tv_sec += seconds_since_epoch; 1782 tp->tv_sec = TheISA::htog(tp->tv_sec); 1783 tp->tv_nsec = TheISA::htog(tp->tv_nsec); 1784 1785 tp.copyOut(tc->getMemProxy()); 1786 1787 return 0; 1788} 1789 1790/// Target clock_getres() function. 1791template <class OS> 1792SyscallReturn 1793clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1794{ 1795 int index = 1; 1796 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1797 1798 // Set resolution at ns, which is what clock_gettime() returns 1799 tp->tv_sec = 0; 1800 tp->tv_nsec = 1; 1801 1802 tp.copyOut(tc->getMemProxy()); 1803 1804 return 0; 1805} 1806 1807/// Target gettimeofday() handler. 1808template <class OS> 1809SyscallReturn 1810gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process, 1811 ThreadContext *tc) 1812{ 1813 int index = 0; 1814 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index)); 1815 1816 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec); 1817 tp->tv_sec += seconds_since_epoch; 1818 tp->tv_sec = TheISA::htog(tp->tv_sec); 1819 tp->tv_usec = TheISA::htog(tp->tv_usec); 1820 1821 tp.copyOut(tc->getMemProxy()); 1822 1823 return 0; 1824} 1825 1826 1827/// Target utimes() handler. 1828template <class OS> 1829SyscallReturn 1830utimesFunc(SyscallDesc *desc, int callnum, Process *process, 1831 ThreadContext *tc) 1832{ 1833 std::string path; 1834 1835 int index = 0; 1836 if (!tc->getMemProxy().tryReadString(path, 1837 process->getSyscallArg(tc, index))) { 1838 return -EFAULT; 1839 } 1840 1841 TypedBufferArg<typename OS::timeval [2]> 1842 tp(process->getSyscallArg(tc, index)); 1843 tp.copyIn(tc->getMemProxy()); 1844 1845 struct timeval hostTimeval[2]; 1846 for (int i = 0; i < 2; ++i) { 1847 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec); 1848 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec); 1849 } 1850 1851 // Adjust path for current working directory 1852 path = process->fullPath(path); 1853 1854 int result = utimes(path.c_str(), hostTimeval); 1855 1856 if (result < 0) 1857 return -errno; 1858 1859 return 0; 1860} 1861 1862template <class OS> 1863SyscallReturn 1864execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1865{ 1866 desc->setFlags(0); 1867 1868 int index = 0; 1869 std::string path; 1870 SETranslatingPortProxy & mem_proxy = tc->getMemProxy(); 1871 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index))) 1872 return -EFAULT; 1873 1874 if (access(path.c_str(), F_OK) == -1) 1875 return -EACCES; 1876 1877 auto read_in = [](std::vector<std::string> & vect, 1878 SETranslatingPortProxy & mem_proxy, 1879 Addr mem_loc) 1880 { 1881 for (int inc = 0; ; inc++) { 1882 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr)); 1883 b.copyIn(mem_proxy); 1884 1885 if (!*(Addr*)b.bufferPtr()) 1886 break; 1887 1888 vect.push_back(std::string()); 1889 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr()); 1890 } 1891 }; 1892 1893 /** 1894 * Note that ProcessParams is generated by swig and there are no other 1895 * examples of how to create anything but this default constructor. The 1896 * fields are manually initialized instead of passing parameters to the 1897 * constructor. 1898 */ 1899 ProcessParams *pp = new ProcessParams(); 1900 pp->executable = path; 1901 Addr argv_mem_loc = p->getSyscallArg(tc, index); 1902 read_in(pp->cmd, mem_proxy, argv_mem_loc); 1903 Addr envp_mem_loc = p->getSyscallArg(tc, index); 1904 read_in(pp->env, mem_proxy, envp_mem_loc); 1905 pp->uid = p->uid(); 1906 pp->egid = p->egid(); 1907 pp->euid = p->euid(); 1908 pp->gid = p->gid(); 1909 pp->ppid = p->ppid(); 1910 pp->pid = p->pid(); 1911 pp->input.assign("cin"); 1912 pp->output.assign("cout"); 1913 pp->errout.assign("cerr"); 1914 pp->cwd.assign(p->getcwd()); 1915 pp->system = p->system; 1916 /** 1917 * Prevent process object creation with identical PIDs (which will trip 1918 * a fatal check in Process constructor). The execve call is supposed to 1919 * take over the currently executing process' identity but replace 1920 * whatever it is doing with a new process image. Instead of hijacking 1921 * the process object in the simulator, we create a new process object 1922 * and bind to the previous process' thread below (hijacking the thread). 1923 */ 1924 p->system->PIDs.erase(p->pid()); 1925 Process *new_p = pp->create(); 1926 delete pp; 1927 1928 /** 1929 * Work through the file descriptor array and close any files marked 1930 * close-on-exec. 1931 */ 1932 new_p->fds = p->fds; 1933 for (int i = 0; i < new_p->fds->getSize(); i++) { 1934 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i]; 1935 if (fdep && fdep->getCOE()) 1936 new_p->fds->closeFDEntry(i); 1937 } 1938 1939 *new_p->sigchld = true; 1940 1941 delete p; 1942 tc->clearArchRegs(); 1943 tc->setProcessPtr(new_p); 1944 new_p->assignThreadContext(tc->contextId()); 1945 new_p->initState(); 1946 tc->activate(); 1947 TheISA::PCState pcState = tc->pcState(); 1948 tc->setNPC(pcState.instAddr()); 1949 1950 desc->setFlags(SyscallDesc::SuppressReturnValue); 1951 return 0; 1952} 1953 1954/// Target getrusage() function. 1955template <class OS> 1956SyscallReturn 1957getrusageFunc(SyscallDesc *desc, int callnum, Process *process, 1958 ThreadContext *tc) 1959{ 1960 int index = 0; 1961 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN 1962 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index)); 1963 1964 rup->ru_utime.tv_sec = 0; 1965 rup->ru_utime.tv_usec = 0; 1966 rup->ru_stime.tv_sec = 0; 1967 rup->ru_stime.tv_usec = 0; 1968 rup->ru_maxrss = 0; 1969 rup->ru_ixrss = 0; 1970 rup->ru_idrss = 0; 1971 rup->ru_isrss = 0; 1972 rup->ru_minflt = 0; 1973 rup->ru_majflt = 0; 1974 rup->ru_nswap = 0; 1975 rup->ru_inblock = 0; 1976 rup->ru_oublock = 0; 1977 rup->ru_msgsnd = 0; 1978 rup->ru_msgrcv = 0; 1979 rup->ru_nsignals = 0; 1980 rup->ru_nvcsw = 0; 1981 rup->ru_nivcsw = 0; 1982 1983 switch (who) { 1984 case OS::TGT_RUSAGE_SELF: 1985 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); 1986 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec); 1987 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec); 1988 break; 1989 1990 case OS::TGT_RUSAGE_CHILDREN: 1991 // do nothing. We have no child processes, so they take no time. 1992 break; 1993 1994 default: 1995 // don't really handle THREAD or CHILDREN, but just warn and 1996 // plow ahead 1997 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", 1998 who); 1999 } 2000 2001 rup.copyOut(tc->getMemProxy()); 2002 2003 return 0; 2004} 2005 2006/// Target times() function. 2007template <class OS> 2008SyscallReturn 2009timesFunc(SyscallDesc *desc, int callnum, Process *process, 2010 ThreadContext *tc) 2011{ 2012 int index = 0; 2013 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index)); 2014 2015 // Fill in the time structure (in clocks) 2016 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s; 2017 bufp->tms_utime = clocks; 2018 bufp->tms_stime = 0; 2019 bufp->tms_cutime = 0; 2020 bufp->tms_cstime = 0; 2021 2022 // Convert to host endianness 2023 bufp->tms_utime = TheISA::htog(bufp->tms_utime); 2024 2025 // Write back 2026 bufp.copyOut(tc->getMemProxy()); 2027 2028 // Return clock ticks since system boot 2029 return clocks; 2030} 2031 2032/// Target time() function. 2033template <class OS> 2034SyscallReturn 2035timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 2036{ 2037 typename OS::time_t sec, usec; 2038 getElapsedTimeMicro(sec, usec); 2039 sec += seconds_since_epoch; 2040 2041 int index = 0; 2042 Addr taddr = (Addr)process->getSyscallArg(tc, index); 2043 if (taddr != 0) { 2044 typename OS::time_t t = sec; 2045 t = TheISA::htog(t); 2046 SETranslatingPortProxy &p = tc->getMemProxy(); 2047 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t)); 2048 } 2049 return sec; 2050} 2051 2052template <class OS> 2053SyscallReturn 2054tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 2055{ 2056 int index = 0; 2057 int tgid = process->getSyscallArg(tc, index); 2058 int tid = process->getSyscallArg(tc, index); 2059 int sig = process->getSyscallArg(tc, index); 2060 2061 /** 2062 * This system call is intended to allow killing a specific thread 2063 * within an arbitrary thread group if sanctioned with permission checks. 2064 * It's usually true that threads share the termination signal as pointed 2065 * out by the pthread_kill man page and this seems to be the intended 2066 * usage. Due to this being an emulated environment, assume the following: 2067 * Threads are allowed to call tgkill because the EUID for all threads 2068 * should be the same. There is no signal handling mechanism for kernel 2069 * registration of signal handlers since signals are poorly supported in 2070 * emulation mode. Since signal handlers cannot be registered, all 2071 * threads within in a thread group must share the termination signal. 2072 * We never exhaust PIDs so there's no chance of finding the wrong one 2073 * due to PID rollover. 2074 */ 2075 2076 System *sys = tc->getSystemPtr(); 2077 Process *tgt_proc = nullptr; 2078 for (int i = 0; i < sys->numContexts(); i++) { 2079 Process *temp = sys->threadContexts[i]->getProcessPtr(); 2080 if (temp->pid() == tid) { 2081 tgt_proc = temp; 2082 break; 2083 } 2084 } 2085 2086 if (sig != 0 || sig != OS::TGT_SIGABRT) 2087 return -EINVAL; 2088 2089 if (tgt_proc == nullptr) 2090 return -ESRCH; 2091 2092 if (tgid != -1 && tgt_proc->tgid() != tgid) 2093 return -ESRCH; 2094 2095 if (sig == OS::TGT_SIGABRT) 2096 exitGroupFunc(desc, 252, process, tc); 2097 2098 return 0; 2099} 2100 2101 2102#endif // __SIM_SYSCALL_EMUL_HH__ 2103