syscall_emul.hh revision 13539
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#if defined(SYS_getdents64) 313// Target getdents() handler. 314SyscallReturn getdents64Func(SyscallDesc *desc, int num, 315 Process *p, ThreadContext *tc); 316#endif 317 318// Target getuid() handler. 319SyscallReturn getuidFunc(SyscallDesc *desc, int num, 320 Process *p, ThreadContext *tc); 321 322/// Target getgid() handler. 323SyscallReturn getgidFunc(SyscallDesc *desc, int num, 324 Process *p, ThreadContext *tc); 325 326/// Target getppid() handler. 327SyscallReturn getppidFunc(SyscallDesc *desc, int num, 328 Process *p, ThreadContext *tc); 329 330/// Target geteuid() handler. 331SyscallReturn geteuidFunc(SyscallDesc *desc, int num, 332 Process *p, ThreadContext *tc); 333 334/// Target getegid() handler. 335SyscallReturn getegidFunc(SyscallDesc *desc, int num, 336 Process *p, ThreadContext *tc); 337 338/// Target access() handler 339SyscallReturn accessFunc(SyscallDesc *desc, int num, 340 Process *p, ThreadContext *tc); 341SyscallReturn accessFunc(SyscallDesc *desc, int num, 342 Process *p, ThreadContext *tc, 343 int index); 344 345/// Futex system call 346/// Implemented by Daniel Sanchez 347/// Used by printf's in multi-threaded apps 348template <class OS> 349SyscallReturn 350futexFunc(SyscallDesc *desc, int callnum, Process *process, 351 ThreadContext *tc) 352{ 353 using namespace std; 354 355 int index = 0; 356 Addr uaddr = process->getSyscallArg(tc, index); 357 int op = process->getSyscallArg(tc, index); 358 int val = process->getSyscallArg(tc, index); 359 360 /* 361 * Unsupported option that does not affect the correctness of the 362 * application. This is a performance optimization utilized by Linux. 363 */ 364 op &= ~OS::TGT_FUTEX_PRIVATE_FLAG; 365 366 FutexMap &futex_map = tc->getSystemPtr()->futexMap; 367 368 if (OS::TGT_FUTEX_WAIT == op) { 369 // Ensure futex system call accessed atomically. 370 BufferArg buf(uaddr, sizeof(int)); 371 buf.copyIn(tc->getMemProxy()); 372 int mem_val = *(int*)buf.bufferPtr(); 373 374 /* 375 * The value in memory at uaddr is not equal with the expected val 376 * (a different thread must have changed it before the system call was 377 * invoked). In this case, we need to throw an error. 378 */ 379 if (val != mem_val) 380 return -OS::TGT_EWOULDBLOCK; 381 382 futex_map.suspend(uaddr, process->tgid(), tc); 383 384 return 0; 385 } else if (OS::TGT_FUTEX_WAKE == op) { 386 return futex_map.wakeup(uaddr, process->tgid(), val); 387 } 388 389 warn("futex: op %d not implemented; ignoring.", op); 390 return -ENOSYS; 391} 392 393 394/// Pseudo Funcs - These functions use a different return convension, 395/// returning a second value in a register other than the normal return register 396SyscallReturn pipePseudoFunc(SyscallDesc *desc, int num, 397 Process *process, ThreadContext *tc); 398 399/// Target getpidPseudo() handler. 400SyscallReturn getpidPseudoFunc(SyscallDesc *desc, int num, 401 Process *p, ThreadContext *tc); 402 403/// Target getuidPseudo() handler. 404SyscallReturn getuidPseudoFunc(SyscallDesc *desc, int num, 405 Process *p, ThreadContext *tc); 406 407/// Target getgidPseudo() handler. 408SyscallReturn getgidPseudoFunc(SyscallDesc *desc, int num, 409 Process *p, ThreadContext *tc); 410 411 412/// A readable name for 1,000,000, for converting microseconds to seconds. 413const int one_million = 1000000; 414/// A readable name for 1,000,000,000, for converting nanoseconds to seconds. 415const int one_billion = 1000000000; 416 417/// Approximate seconds since the epoch (1/1/1970). About a billion, 418/// by my reckoning. We want to keep this a constant (not use the 419/// real-world time) to keep simulations repeatable. 420const unsigned seconds_since_epoch = 1000000000; 421 422/// Helper function to convert current elapsed time to seconds and 423/// microseconds. 424template <class T1, class T2> 425void 426getElapsedTimeMicro(T1 &sec, T2 &usec) 427{ 428 uint64_t elapsed_usecs = curTick() / SimClock::Int::us; 429 sec = elapsed_usecs / one_million; 430 usec = elapsed_usecs % one_million; 431} 432 433/// Helper function to convert current elapsed time to seconds and 434/// nanoseconds. 435template <class T1, class T2> 436void 437getElapsedTimeNano(T1 &sec, T2 &nsec) 438{ 439 uint64_t elapsed_nsecs = curTick() / SimClock::Int::ns; 440 sec = elapsed_nsecs / one_billion; 441 nsec = elapsed_nsecs % one_billion; 442} 443 444////////////////////////////////////////////////////////////////////// 445// 446// The following emulation functions are generic, but need to be 447// templated to account for differences in types, constants, etc. 448// 449////////////////////////////////////////////////////////////////////// 450 451 typedef struct statfs hst_statfs; 452#if NO_STAT64 453 typedef struct stat hst_stat; 454 typedef struct stat hst_stat64; 455#else 456 typedef struct stat hst_stat; 457 typedef struct stat64 hst_stat64; 458#endif 459 460//// Helper function to convert a host stat buffer to a target stat 461//// buffer. Also copies the target buffer out to the simulated 462//// memory space. Used by stat(), fstat(), and lstat(). 463 464template <typename target_stat, typename host_stat> 465void 466convertStatBuf(target_stat &tgt, host_stat *host, bool fakeTTY = false) 467{ 468 using namespace TheISA; 469 470 if (fakeTTY) 471 tgt->st_dev = 0xA; 472 else 473 tgt->st_dev = host->st_dev; 474 tgt->st_dev = TheISA::htog(tgt->st_dev); 475 tgt->st_ino = host->st_ino; 476 tgt->st_ino = TheISA::htog(tgt->st_ino); 477 tgt->st_mode = host->st_mode; 478 if (fakeTTY) { 479 // Claim to be a character device 480 tgt->st_mode &= ~S_IFMT; // Clear S_IFMT 481 tgt->st_mode |= S_IFCHR; // Set S_IFCHR 482 } 483 tgt->st_mode = TheISA::htog(tgt->st_mode); 484 tgt->st_nlink = host->st_nlink; 485 tgt->st_nlink = TheISA::htog(tgt->st_nlink); 486 tgt->st_uid = host->st_uid; 487 tgt->st_uid = TheISA::htog(tgt->st_uid); 488 tgt->st_gid = host->st_gid; 489 tgt->st_gid = TheISA::htog(tgt->st_gid); 490 if (fakeTTY) 491 tgt->st_rdev = 0x880d; 492 else 493 tgt->st_rdev = host->st_rdev; 494 tgt->st_rdev = TheISA::htog(tgt->st_rdev); 495 tgt->st_size = host->st_size; 496 tgt->st_size = TheISA::htog(tgt->st_size); 497 tgt->st_atimeX = host->st_atime; 498 tgt->st_atimeX = TheISA::htog(tgt->st_atimeX); 499 tgt->st_mtimeX = host->st_mtime; 500 tgt->st_mtimeX = TheISA::htog(tgt->st_mtimeX); 501 tgt->st_ctimeX = host->st_ctime; 502 tgt->st_ctimeX = TheISA::htog(tgt->st_ctimeX); 503 // Force the block size to be 8KB. This helps to ensure buffered io works 504 // consistently across different hosts. 505 tgt->st_blksize = 0x2000; 506 tgt->st_blksize = TheISA::htog(tgt->st_blksize); 507 tgt->st_blocks = host->st_blocks; 508 tgt->st_blocks = TheISA::htog(tgt->st_blocks); 509} 510 511// Same for stat64 512 513template <typename target_stat, typename host_stat64> 514void 515convertStat64Buf(target_stat &tgt, host_stat64 *host, bool fakeTTY = false) 516{ 517 using namespace TheISA; 518 519 convertStatBuf<target_stat, host_stat64>(tgt, host, fakeTTY); 520#if defined(STAT_HAVE_NSEC) 521 tgt->st_atime_nsec = host->st_atime_nsec; 522 tgt->st_atime_nsec = TheISA::htog(tgt->st_atime_nsec); 523 tgt->st_mtime_nsec = host->st_mtime_nsec; 524 tgt->st_mtime_nsec = TheISA::htog(tgt->st_mtime_nsec); 525 tgt->st_ctime_nsec = host->st_ctime_nsec; 526 tgt->st_ctime_nsec = TheISA::htog(tgt->st_ctime_nsec); 527#else 528 tgt->st_atime_nsec = 0; 529 tgt->st_mtime_nsec = 0; 530 tgt->st_ctime_nsec = 0; 531#endif 532} 533 534// Here are a couple of convenience functions 535template<class OS> 536void 537copyOutStatBuf(SETranslatingPortProxy &mem, Addr addr, 538 hst_stat *host, bool fakeTTY = false) 539{ 540 typedef TypedBufferArg<typename OS::tgt_stat> tgt_stat_buf; 541 tgt_stat_buf tgt(addr); 542 convertStatBuf<tgt_stat_buf, hst_stat>(tgt, host, fakeTTY); 543 tgt.copyOut(mem); 544} 545 546template<class OS> 547void 548copyOutStat64Buf(SETranslatingPortProxy &mem, Addr addr, 549 hst_stat64 *host, bool fakeTTY = false) 550{ 551 typedef TypedBufferArg<typename OS::tgt_stat64> tgt_stat_buf; 552 tgt_stat_buf tgt(addr); 553 convertStat64Buf<tgt_stat_buf, hst_stat64>(tgt, host, fakeTTY); 554 tgt.copyOut(mem); 555} 556 557template <class OS> 558void 559copyOutStatfsBuf(SETranslatingPortProxy &mem, Addr addr, 560 hst_statfs *host) 561{ 562 TypedBufferArg<typename OS::tgt_statfs> tgt(addr); 563 564 tgt->f_type = TheISA::htog(host->f_type); 565#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 566 tgt->f_bsize = TheISA::htog(host->f_iosize); 567#else 568 tgt->f_bsize = TheISA::htog(host->f_bsize); 569#endif 570 tgt->f_blocks = TheISA::htog(host->f_blocks); 571 tgt->f_bfree = TheISA::htog(host->f_bfree); 572 tgt->f_bavail = TheISA::htog(host->f_bavail); 573 tgt->f_files = TheISA::htog(host->f_files); 574 tgt->f_ffree = TheISA::htog(host->f_ffree); 575 memcpy(&tgt->f_fsid, &host->f_fsid, sizeof(host->f_fsid)); 576#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) 577 tgt->f_namelen = TheISA::htog(host->f_namemax); 578 tgt->f_frsize = TheISA::htog(host->f_bsize); 579#elif defined(__APPLE__) 580 tgt->f_namelen = 0; 581 tgt->f_frsize = 0; 582#else 583 tgt->f_namelen = TheISA::htog(host->f_namelen); 584 tgt->f_frsize = TheISA::htog(host->f_frsize); 585#endif 586#if defined(__linux__) 587 memcpy(&tgt->f_spare, &host->f_spare, sizeof(host->f_spare)); 588#else 589 /* 590 * The fields are different sizes per OS. Don't bother with 591 * f_spare or f_reserved on non-Linux for now. 592 */ 593 memset(&tgt->f_spare, 0, sizeof(tgt->f_spare)); 594#endif 595 596 tgt.copyOut(mem); 597} 598 599/// Target ioctl() handler. For the most part, programs call ioctl() 600/// only to find out if their stdout is a tty, to determine whether to 601/// do line or block buffering. We always claim that output fds are 602/// not TTYs to provide repeatable results. 603template <class OS> 604SyscallReturn 605ioctlFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 606{ 607 int index = 0; 608 int tgt_fd = p->getSyscallArg(tc, index); 609 unsigned req = p->getSyscallArg(tc, index); 610 611 DPRINTF(SyscallVerbose, "ioctl(%d, 0x%x, ...)\n", tgt_fd, req); 612 613 if (OS::isTtyReq(req)) 614 return -ENOTTY; 615 616 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>((*p->fds)[tgt_fd]); 617 if (!dfdp) 618 return -EBADF; 619 620 /** 621 * If the driver is valid, issue the ioctl through it. Otherwise, 622 * there's an implicit assumption that the device is a TTY type and we 623 * return that we do not have a valid TTY. 624 */ 625 EmulatedDriver *emul_driver = dfdp->getDriver(); 626 if (emul_driver) 627 return emul_driver->ioctl(p, tc, req); 628 629 /** 630 * For lack of a better return code, return ENOTTY. Ideally, we should 631 * return something better here, but at least we issue the warning. 632 */ 633 warn("Unsupported ioctl call (return ENOTTY): ioctl(%d, 0x%x, ...) @ \n", 634 tgt_fd, req, tc->pcState()); 635 return -ENOTTY; 636} 637 638template <class OS> 639SyscallReturn 640openImpl(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc, 641 bool isopenat) 642{ 643 int index = 0; 644 int tgt_dirfd = -1; 645 646 /** 647 * If using the openat variant, read in the target directory file 648 * descriptor from the simulated process. 649 */ 650 if (isopenat) 651 tgt_dirfd = p->getSyscallArg(tc, index); 652 653 /** 654 * Retrieve the simulated process' memory proxy and then read in the path 655 * string from that memory space into the host's working memory space. 656 */ 657 std::string path; 658 if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index))) 659 return -EFAULT; 660 661#ifdef __CYGWIN32__ 662 int host_flags = O_BINARY; 663#else 664 int host_flags = 0; 665#endif 666 /** 667 * Translate target flags into host flags. Flags exist which are not 668 * ported between architectures which can cause check failures. 669 */ 670 int tgt_flags = p->getSyscallArg(tc, index); 671 for (int i = 0; i < OS::NUM_OPEN_FLAGS; i++) { 672 if (tgt_flags & OS::openFlagTable[i].tgtFlag) { 673 tgt_flags &= ~OS::openFlagTable[i].tgtFlag; 674 host_flags |= OS::openFlagTable[i].hostFlag; 675 } 676 } 677 if (tgt_flags) { 678 warn("open%s: cannot decode flags 0x%x", 679 isopenat ? "at" : "", tgt_flags); 680 } 681#ifdef __CYGWIN32__ 682 host_flags |= O_BINARY; 683#endif 684 685 int mode = p->getSyscallArg(tc, index); 686 687 /** 688 * If the simulated process called open or openat with AT_FDCWD specified, 689 * take the current working directory value which was passed into the 690 * process class as a Python parameter and append the current path to 691 * create a full path. 692 * Otherwise, openat with a valid target directory file descriptor has 693 * been called. If the path option, which was passed in as a parameter, 694 * is not absolute, retrieve the directory file descriptor's path and 695 * prepend it to the path passed in as a parameter. 696 * In every case, we should have a full path (which is relevant to the 697 * host) to work with after this block has been passed. 698 */ 699 if (!isopenat || (isopenat && tgt_dirfd == OS::TGT_AT_FDCWD)) { 700 path = p->fullPath(path); 701 } else if (!startswith(path, "/")) { 702 std::shared_ptr<FDEntry> fdep = ((*p->fds)[tgt_dirfd]); 703 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 704 if (!ffdp) 705 return -EBADF; 706 path.insert(0, ffdp->getFileName() + "/"); 707 } 708 709 /** 710 * Since this is an emulated environment, we create pseudo file 711 * descriptors for device requests that have been registered with 712 * the process class through Python; this allows us to create a file 713 * descriptor for subsequent ioctl or mmap calls. 714 */ 715 if (startswith(path, "/dev/")) { 716 std::string filename = path.substr(strlen("/dev/")); 717 EmulatedDriver *drv = p->findDriver(filename); 718 if (drv) { 719 DPRINTF_SYSCALL(Verbose, "open%s: passing call to " 720 "driver open with path[%s]\n", 721 isopenat ? "at" : "", path.c_str()); 722 return drv->open(p, tc, mode, host_flags); 723 } 724 /** 725 * Fall through here for pass through to host devices, such 726 * as /dev/zero 727 */ 728 } 729 730 /** 731 * Some special paths and files cannot be called on the host and need 732 * to be handled as special cases inside the simulator. 733 * If the full path that was created above does not match any of the 734 * special cases, pass it through to the open call on the host to let 735 * the host open the file on our behalf. 736 * If the host cannot open the file, return the host's error code back 737 * through the system call to the simulated process. 738 */ 739 int sim_fd = -1; 740 std::vector<std::string> special_paths = 741 { "/proc/", "/system/", "/sys/", "/platform/", "/etc/passwd" }; 742 for (auto entry : special_paths) { 743 if (startswith(path, entry)) 744 sim_fd = OS::openSpecialFile(path, p, tc); 745 } 746 if (sim_fd == -1) { 747 sim_fd = open(path.c_str(), host_flags, mode); 748 } 749 if (sim_fd == -1) { 750 int local = -errno; 751 DPRINTF_SYSCALL(Verbose, "open%s: failed -> path:%s\n", 752 isopenat ? "at" : "", path.c_str()); 753 return local; 754 } 755 756 /** 757 * The file was opened successfully and needs to be recorded in the 758 * process' file descriptor array so that it can be retrieved later. 759 * The target file descriptor that is chosen will be the lowest unused 760 * file descriptor. 761 * Return the indirect target file descriptor back to the simulated 762 * process to act as a handle for the opened file. 763 */ 764 auto ffdp = std::make_shared<FileFDEntry>(sim_fd, host_flags, path, 0); 765 int tgt_fd = p->fds->allocFD(ffdp); 766 DPRINTF_SYSCALL(Verbose, "open%s: sim_fd[%d], target_fd[%d] -> path:%s\n", 767 isopenat ? "at" : "", sim_fd, tgt_fd, path.c_str()); 768 return tgt_fd; 769} 770 771/// Target open() handler. 772template <class OS> 773SyscallReturn 774openFunc(SyscallDesc *desc, int callnum, Process *process, 775 ThreadContext *tc) 776{ 777 return openImpl<OS>(desc, callnum, process, tc, false); 778} 779 780/// Target openat() handler. 781template <class OS> 782SyscallReturn 783openatFunc(SyscallDesc *desc, int callnum, Process *process, 784 ThreadContext *tc) 785{ 786 return openImpl<OS>(desc, callnum, process, tc, true); 787} 788 789/// Target unlinkat() handler. 790template <class OS> 791SyscallReturn 792unlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 793 ThreadContext *tc) 794{ 795 int index = 0; 796 int dirfd = process->getSyscallArg(tc, index); 797 if (dirfd != OS::TGT_AT_FDCWD) 798 warn("unlinkat: first argument not AT_FDCWD; unlikely to work"); 799 800 return unlinkHelper(desc, callnum, process, tc, 1); 801} 802 803/// Target facessat() handler 804template <class OS> 805SyscallReturn 806faccessatFunc(SyscallDesc *desc, int callnum, Process *process, 807 ThreadContext *tc) 808{ 809 int index = 0; 810 int dirfd = process->getSyscallArg(tc, index); 811 if (dirfd != OS::TGT_AT_FDCWD) 812 warn("faccessat: first argument not AT_FDCWD; unlikely to work"); 813 return accessFunc(desc, callnum, process, tc, 1); 814} 815 816/// Target readlinkat() handler 817template <class OS> 818SyscallReturn 819readlinkatFunc(SyscallDesc *desc, int callnum, Process *process, 820 ThreadContext *tc) 821{ 822 int index = 0; 823 int dirfd = process->getSyscallArg(tc, index); 824 if (dirfd != OS::TGT_AT_FDCWD) 825 warn("openat: first argument not AT_FDCWD; unlikely to work"); 826 return readlinkFunc(desc, callnum, process, tc, 1); 827} 828 829/// Target renameat() handler. 830template <class OS> 831SyscallReturn 832renameatFunc(SyscallDesc *desc, int callnum, Process *process, 833 ThreadContext *tc) 834{ 835 int index = 0; 836 837 int olddirfd = process->getSyscallArg(tc, index); 838 if (olddirfd != OS::TGT_AT_FDCWD) 839 warn("renameat: first argument not AT_FDCWD; unlikely to work"); 840 841 std::string old_name; 842 843 if (!tc->getMemProxy().tryReadString(old_name, 844 process->getSyscallArg(tc, index))) 845 return -EFAULT; 846 847 int newdirfd = process->getSyscallArg(tc, index); 848 if (newdirfd != OS::TGT_AT_FDCWD) 849 warn("renameat: third argument not AT_FDCWD; unlikely to work"); 850 851 std::string new_name; 852 853 if (!tc->getMemProxy().tryReadString(new_name, 854 process->getSyscallArg(tc, index))) 855 return -EFAULT; 856 857 // Adjust path for current working directory 858 old_name = process->fullPath(old_name); 859 new_name = process->fullPath(new_name); 860 861 int result = rename(old_name.c_str(), new_name.c_str()); 862 return (result == -1) ? -errno : result; 863} 864 865/// Target sysinfo() handler. 866template <class OS> 867SyscallReturn 868sysinfoFunc(SyscallDesc *desc, int callnum, Process *process, 869 ThreadContext *tc) 870{ 871 872 int index = 0; 873 TypedBufferArg<typename OS::tgt_sysinfo> 874 sysinfo(process->getSyscallArg(tc, index)); 875 876 sysinfo->uptime = seconds_since_epoch; 877 sysinfo->totalram = process->system->memSize(); 878 sysinfo->mem_unit = 1; 879 880 sysinfo.copyOut(tc->getMemProxy()); 881 882 return 0; 883} 884 885/// Target chmod() handler. 886template <class OS> 887SyscallReturn 888chmodFunc(SyscallDesc *desc, int callnum, Process *process, 889 ThreadContext *tc) 890{ 891 std::string path; 892 893 int index = 0; 894 if (!tc->getMemProxy().tryReadString(path, 895 process->getSyscallArg(tc, index))) { 896 return -EFAULT; 897 } 898 899 uint32_t mode = process->getSyscallArg(tc, index); 900 mode_t hostMode = 0; 901 902 // XXX translate mode flags via OS::something??? 903 hostMode = mode; 904 905 // Adjust path for current working directory 906 path = process->fullPath(path); 907 908 // do the chmod 909 int result = chmod(path.c_str(), hostMode); 910 if (result < 0) 911 return -errno; 912 913 return 0; 914} 915 916 917/// Target fchmod() handler. 918template <class OS> 919SyscallReturn 920fchmodFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 921{ 922 int index = 0; 923 int tgt_fd = p->getSyscallArg(tc, index); 924 uint32_t mode = p->getSyscallArg(tc, index); 925 926 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 927 if (!ffdp) 928 return -EBADF; 929 int sim_fd = ffdp->getSimFD(); 930 931 mode_t hostMode = mode; 932 933 int result = fchmod(sim_fd, hostMode); 934 935 return (result < 0) ? -errno : 0; 936} 937 938/// Target mremap() handler. 939template <class OS> 940SyscallReturn 941mremapFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 942{ 943 int index = 0; 944 Addr start = process->getSyscallArg(tc, index); 945 uint64_t old_length = process->getSyscallArg(tc, index); 946 uint64_t new_length = process->getSyscallArg(tc, index); 947 uint64_t flags = process->getSyscallArg(tc, index); 948 uint64_t provided_address = 0; 949 bool use_provided_address = flags & OS::TGT_MREMAP_FIXED; 950 951 if (use_provided_address) 952 provided_address = process->getSyscallArg(tc, index); 953 954 if ((start % TheISA::PageBytes != 0) || 955 (provided_address % TheISA::PageBytes != 0)) { 956 warn("mremap failing: arguments not page aligned"); 957 return -EINVAL; 958 } 959 960 new_length = roundUp(new_length, TheISA::PageBytes); 961 962 if (new_length > old_length) { 963 std::shared_ptr<MemState> mem_state = process->memState; 964 Addr mmap_end = mem_state->getMmapEnd(); 965 966 if ((start + old_length) == mmap_end && 967 (!use_provided_address || provided_address == start)) { 968 // This case cannot occur when growing downward, as 969 // start is greater than or equal to mmap_end. 970 uint64_t diff = new_length - old_length; 971 process->allocateMem(mmap_end, diff); 972 mem_state->setMmapEnd(mmap_end + diff); 973 return start; 974 } else { 975 if (!use_provided_address && !(flags & OS::TGT_MREMAP_MAYMOVE)) { 976 warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); 977 return -ENOMEM; 978 } else { 979 uint64_t new_start = provided_address; 980 if (!use_provided_address) { 981 new_start = process->mmapGrowsDown() ? 982 mmap_end - new_length : mmap_end; 983 mmap_end = process->mmapGrowsDown() ? 984 new_start : mmap_end + new_length; 985 mem_state->setMmapEnd(mmap_end); 986 } 987 988 process->pTable->remap(start, old_length, new_start); 989 warn("mremapping to new vaddr %08p-%08p, adding %d\n", 990 new_start, new_start + new_length, 991 new_length - old_length); 992 // add on the remaining unallocated pages 993 process->allocateMem(new_start + old_length, 994 new_length - old_length, 995 use_provided_address /* clobber */); 996 if (use_provided_address && 997 ((new_start + new_length > mem_state->getMmapEnd() && 998 !process->mmapGrowsDown()) || 999 (new_start < mem_state->getMmapEnd() && 1000 process->mmapGrowsDown()))) { 1001 // something fishy going on here, at least notify the user 1002 // @todo: increase mmap_end? 1003 warn("mmap region limit exceeded with MREMAP_FIXED\n"); 1004 } 1005 warn("returning %08p as start\n", new_start); 1006 return new_start; 1007 } 1008 } 1009 } else { 1010 if (use_provided_address && provided_address != start) 1011 process->pTable->remap(start, new_length, provided_address); 1012 process->pTable->unmap(start + new_length, old_length - new_length); 1013 return use_provided_address ? provided_address : start; 1014 } 1015} 1016 1017/// Target stat() handler. 1018template <class OS> 1019SyscallReturn 1020statFunc(SyscallDesc *desc, int callnum, Process *process, 1021 ThreadContext *tc) 1022{ 1023 std::string path; 1024 1025 int index = 0; 1026 if (!tc->getMemProxy().tryReadString(path, 1027 process->getSyscallArg(tc, index))) { 1028 return -EFAULT; 1029 } 1030 Addr bufPtr = process->getSyscallArg(tc, index); 1031 1032 // Adjust path for current working directory 1033 path = process->fullPath(path); 1034 1035 struct stat hostBuf; 1036 int result = stat(path.c_str(), &hostBuf); 1037 1038 if (result < 0) 1039 return -errno; 1040 1041 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1042 1043 return 0; 1044} 1045 1046 1047/// Target stat64() handler. 1048template <class OS> 1049SyscallReturn 1050stat64Func(SyscallDesc *desc, int callnum, Process *process, 1051 ThreadContext *tc) 1052{ 1053 std::string path; 1054 1055 int index = 0; 1056 if (!tc->getMemProxy().tryReadString(path, 1057 process->getSyscallArg(tc, index))) 1058 return -EFAULT; 1059 Addr bufPtr = process->getSyscallArg(tc, index); 1060 1061 // Adjust path for current working directory 1062 path = process->fullPath(path); 1063 1064#if NO_STAT64 1065 struct stat hostBuf; 1066 int result = stat(path.c_str(), &hostBuf); 1067#else 1068 struct stat64 hostBuf; 1069 int result = stat64(path.c_str(), &hostBuf); 1070#endif 1071 1072 if (result < 0) 1073 return -errno; 1074 1075 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1076 1077 return 0; 1078} 1079 1080 1081/// Target fstatat64() handler. 1082template <class OS> 1083SyscallReturn 1084fstatat64Func(SyscallDesc *desc, int callnum, Process *process, 1085 ThreadContext *tc) 1086{ 1087 int index = 0; 1088 int dirfd = process->getSyscallArg(tc, index); 1089 if (dirfd != OS::TGT_AT_FDCWD) 1090 warn("fstatat64: first argument not AT_FDCWD; unlikely to work"); 1091 1092 std::string path; 1093 if (!tc->getMemProxy().tryReadString(path, 1094 process->getSyscallArg(tc, index))) 1095 return -EFAULT; 1096 Addr bufPtr = process->getSyscallArg(tc, index); 1097 1098 // Adjust path for current working directory 1099 path = process->fullPath(path); 1100 1101#if NO_STAT64 1102 struct stat hostBuf; 1103 int result = stat(path.c_str(), &hostBuf); 1104#else 1105 struct stat64 hostBuf; 1106 int result = stat64(path.c_str(), &hostBuf); 1107#endif 1108 1109 if (result < 0) 1110 return -errno; 1111 1112 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1113 1114 return 0; 1115} 1116 1117 1118/// Target fstat64() handler. 1119template <class OS> 1120SyscallReturn 1121fstat64Func(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1122{ 1123 int index = 0; 1124 int tgt_fd = p->getSyscallArg(tc, index); 1125 Addr bufPtr = p->getSyscallArg(tc, index); 1126 1127 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1128 if (!ffdp) 1129 return -EBADF; 1130 int sim_fd = ffdp->getSimFD(); 1131 1132#if NO_STAT64 1133 struct stat hostBuf; 1134 int result = fstat(sim_fd, &hostBuf); 1135#else 1136 struct stat64 hostBuf; 1137 int result = fstat64(sim_fd, &hostBuf); 1138#endif 1139 1140 if (result < 0) 1141 return -errno; 1142 1143 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1144 1145 return 0; 1146} 1147 1148 1149/// Target lstat() handler. 1150template <class OS> 1151SyscallReturn 1152lstatFunc(SyscallDesc *desc, int callnum, Process *process, 1153 ThreadContext *tc) 1154{ 1155 std::string path; 1156 1157 int index = 0; 1158 if (!tc->getMemProxy().tryReadString(path, 1159 process->getSyscallArg(tc, index))) { 1160 return -EFAULT; 1161 } 1162 Addr bufPtr = process->getSyscallArg(tc, index); 1163 1164 // Adjust path for current working directory 1165 path = process->fullPath(path); 1166 1167 struct stat hostBuf; 1168 int result = lstat(path.c_str(), &hostBuf); 1169 1170 if (result < 0) 1171 return -errno; 1172 1173 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1174 1175 return 0; 1176} 1177 1178/// Target lstat64() handler. 1179template <class OS> 1180SyscallReturn 1181lstat64Func(SyscallDesc *desc, int callnum, Process *process, 1182 ThreadContext *tc) 1183{ 1184 std::string path; 1185 1186 int index = 0; 1187 if (!tc->getMemProxy().tryReadString(path, 1188 process->getSyscallArg(tc, index))) { 1189 return -EFAULT; 1190 } 1191 Addr bufPtr = process->getSyscallArg(tc, index); 1192 1193 // Adjust path for current working directory 1194 path = process->fullPath(path); 1195 1196#if NO_STAT64 1197 struct stat hostBuf; 1198 int result = lstat(path.c_str(), &hostBuf); 1199#else 1200 struct stat64 hostBuf; 1201 int result = lstat64(path.c_str(), &hostBuf); 1202#endif 1203 1204 if (result < 0) 1205 return -errno; 1206 1207 copyOutStat64Buf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1208 1209 return 0; 1210} 1211 1212/// Target fstat() handler. 1213template <class OS> 1214SyscallReturn 1215fstatFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1216{ 1217 int index = 0; 1218 int tgt_fd = p->getSyscallArg(tc, index); 1219 Addr bufPtr = p->getSyscallArg(tc, index); 1220 1221 DPRINTF_SYSCALL(Verbose, "fstat(%d, ...)\n", tgt_fd); 1222 1223 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1224 if (!ffdp) 1225 return -EBADF; 1226 int sim_fd = ffdp->getSimFD(); 1227 1228 struct stat hostBuf; 1229 int result = fstat(sim_fd, &hostBuf); 1230 1231 if (result < 0) 1232 return -errno; 1233 1234 copyOutStatBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf, (sim_fd == 1)); 1235 1236 return 0; 1237} 1238 1239 1240/// Target statfs() handler. 1241template <class OS> 1242SyscallReturn 1243statfsFunc(SyscallDesc *desc, int callnum, Process *process, 1244 ThreadContext *tc) 1245{ 1246#if NO_STATFS 1247 warn("Host OS cannot support calls to statfs. Ignoring syscall"); 1248#else 1249 std::string path; 1250 1251 int index = 0; 1252 if (!tc->getMemProxy().tryReadString(path, 1253 process->getSyscallArg(tc, index))) { 1254 return -EFAULT; 1255 } 1256 Addr bufPtr = process->getSyscallArg(tc, index); 1257 1258 // Adjust path for current working directory 1259 path = process->fullPath(path); 1260 1261 struct statfs hostBuf; 1262 int result = statfs(path.c_str(), &hostBuf); 1263 1264 if (result < 0) 1265 return -errno; 1266 1267 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1268#endif 1269 return 0; 1270} 1271 1272template <class OS> 1273SyscallReturn 1274cloneFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1275{ 1276 int index = 0; 1277 1278 TheISA::IntReg flags = p->getSyscallArg(tc, index); 1279 TheISA::IntReg newStack = p->getSyscallArg(tc, index); 1280 Addr ptidPtr = p->getSyscallArg(tc, index); 1281 1282#if THE_ISA == RISCV_ISA or THE_ISA == ARM_ISA 1283 /** 1284 * Linux sets CLONE_BACKWARDS flag for RISC-V and Arm. 1285 * The flag defines the list of clone() arguments in the following 1286 * order: flags -> newStack -> ptidPtr -> tlsPtr -> ctidPtr 1287 */ 1288 Addr tlsPtr = p->getSyscallArg(tc, index); 1289 Addr ctidPtr = p->getSyscallArg(tc, index); 1290#else 1291 Addr ctidPtr = p->getSyscallArg(tc, index); 1292 Addr tlsPtr = p->getSyscallArg(tc, index); 1293#endif 1294 1295 if (((flags & OS::TGT_CLONE_SIGHAND)&& !(flags & OS::TGT_CLONE_VM)) || 1296 ((flags & OS::TGT_CLONE_THREAD) && !(flags & OS::TGT_CLONE_SIGHAND)) || 1297 ((flags & OS::TGT_CLONE_FS) && (flags & OS::TGT_CLONE_NEWNS)) || 1298 ((flags & OS::TGT_CLONE_NEWIPC) && (flags & OS::TGT_CLONE_SYSVSEM)) || 1299 ((flags & OS::TGT_CLONE_NEWPID) && (flags & OS::TGT_CLONE_THREAD)) || 1300 ((flags & OS::TGT_CLONE_VM) && !(newStack))) 1301 return -EINVAL; 1302 1303 ThreadContext *ctc; 1304 if (!(ctc = p->findFreeContext())) 1305 fatal("clone: no spare thread context in system"); 1306 1307 /** 1308 * Note that ProcessParams is generated by swig and there are no other 1309 * examples of how to create anything but this default constructor. The 1310 * fields are manually initialized instead of passing parameters to the 1311 * constructor. 1312 */ 1313 ProcessParams *pp = new ProcessParams(); 1314 pp->executable.assign(*(new std::string(p->progName()))); 1315 pp->cmd.push_back(*(new std::string(p->progName()))); 1316 pp->system = p->system; 1317 pp->cwd.assign(p->getcwd()); 1318 pp->input.assign("stdin"); 1319 pp->output.assign("stdout"); 1320 pp->errout.assign("stderr"); 1321 pp->uid = p->uid(); 1322 pp->euid = p->euid(); 1323 pp->gid = p->gid(); 1324 pp->egid = p->egid(); 1325 1326 /* Find the first free PID that's less than the maximum */ 1327 std::set<int> const& pids = p->system->PIDs; 1328 int temp_pid = *pids.begin(); 1329 do { 1330 temp_pid++; 1331 } while (pids.find(temp_pid) != pids.end()); 1332 if (temp_pid >= System::maxPID) 1333 fatal("temp_pid is too large: %d", temp_pid); 1334 1335 pp->pid = temp_pid; 1336 pp->ppid = (flags & OS::TGT_CLONE_THREAD) ? p->ppid() : p->pid(); 1337 Process *cp = pp->create(); 1338 delete pp; 1339 1340 Process *owner = ctc->getProcessPtr(); 1341 ctc->setProcessPtr(cp); 1342 cp->assignThreadContext(ctc->contextId()); 1343 owner->revokeThreadContext(ctc->contextId()); 1344 1345 if (flags & OS::TGT_CLONE_PARENT_SETTID) { 1346 BufferArg ptidBuf(ptidPtr, sizeof(long)); 1347 long *ptid = (long *)ptidBuf.bufferPtr(); 1348 *ptid = cp->pid(); 1349 ptidBuf.copyOut(tc->getMemProxy()); 1350 } 1351 1352 cp->initState(); 1353 p->clone(tc, ctc, cp, flags); 1354 1355 if (flags & OS::TGT_CLONE_THREAD) { 1356 delete cp->sigchld; 1357 cp->sigchld = p->sigchld; 1358 } else if (flags & OS::TGT_SIGCHLD) { 1359 *cp->sigchld = true; 1360 } 1361 1362 if (flags & OS::TGT_CLONE_CHILD_SETTID) { 1363 BufferArg ctidBuf(ctidPtr, sizeof(long)); 1364 long *ctid = (long *)ctidBuf.bufferPtr(); 1365 *ctid = cp->pid(); 1366 ctidBuf.copyOut(ctc->getMemProxy()); 1367 } 1368 1369 if (flags & OS::TGT_CLONE_CHILD_CLEARTID) 1370 cp->childClearTID = (uint64_t)ctidPtr; 1371 1372 ctc->clearArchRegs(); 1373 1374 OS::archClone(flags, p, cp, tc, ctc, newStack, tlsPtr); 1375 1376 cp->setSyscallReturn(ctc, 0); 1377 1378#if THE_ISA == ALPHA_ISA 1379 ctc->setIntReg(TheISA::SyscallSuccessReg, 0); 1380#elif THE_ISA == SPARC_ISA 1381 tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); 1382 ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); 1383#endif 1384 1385 TheISA::PCState cpc = tc->pcState(); 1386 cpc.advance(); 1387 ctc->pcState(cpc); 1388 ctc->activate(); 1389 1390 return cp->pid(); 1391} 1392 1393/// Target fstatfs() handler. 1394template <class OS> 1395SyscallReturn 1396fstatfsFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1397{ 1398 int index = 0; 1399 int tgt_fd = p->getSyscallArg(tc, index); 1400 Addr bufPtr = p->getSyscallArg(tc, index); 1401 1402 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1403 if (!ffdp) 1404 return -EBADF; 1405 int sim_fd = ffdp->getSimFD(); 1406 1407 struct statfs hostBuf; 1408 int result = fstatfs(sim_fd, &hostBuf); 1409 1410 if (result < 0) 1411 return -errno; 1412 1413 copyOutStatfsBuf<OS>(tc->getMemProxy(), bufPtr, &hostBuf); 1414 1415 return 0; 1416} 1417 1418 1419/// Target writev() handler. 1420template <class OS> 1421SyscallReturn 1422writevFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1423{ 1424 int index = 0; 1425 int tgt_fd = p->getSyscallArg(tc, index); 1426 1427 auto hbfdp = std::dynamic_pointer_cast<HBFDEntry>((*p->fds)[tgt_fd]); 1428 if (!hbfdp) 1429 return -EBADF; 1430 int sim_fd = hbfdp->getSimFD(); 1431 1432 SETranslatingPortProxy &prox = tc->getMemProxy(); 1433 uint64_t tiov_base = p->getSyscallArg(tc, index); 1434 size_t count = p->getSyscallArg(tc, index); 1435 struct iovec hiov[count]; 1436 for (size_t i = 0; i < count; ++i) { 1437 typename OS::tgt_iovec tiov; 1438 1439 prox.readBlob(tiov_base + i*sizeof(typename OS::tgt_iovec), 1440 (uint8_t*)&tiov, sizeof(typename OS::tgt_iovec)); 1441 hiov[i].iov_len = TheISA::gtoh(tiov.iov_len); 1442 hiov[i].iov_base = new char [hiov[i].iov_len]; 1443 prox.readBlob(TheISA::gtoh(tiov.iov_base), (uint8_t *)hiov[i].iov_base, 1444 hiov[i].iov_len); 1445 } 1446 1447 int result = writev(sim_fd, hiov, count); 1448 1449 for (size_t i = 0; i < count; ++i) 1450 delete [] (char *)hiov[i].iov_base; 1451 1452 if (result < 0) 1453 return -errno; 1454 1455 return result; 1456} 1457 1458/// Real mmap handler. 1459template <class OS> 1460SyscallReturn 1461mmapImpl(SyscallDesc *desc, int num, Process *p, ThreadContext *tc, 1462 bool is_mmap2) 1463{ 1464 int index = 0; 1465 Addr start = p->getSyscallArg(tc, index); 1466 uint64_t length = p->getSyscallArg(tc, index); 1467 int prot = p->getSyscallArg(tc, index); 1468 int tgt_flags = p->getSyscallArg(tc, index); 1469 int tgt_fd = p->getSyscallArg(tc, index); 1470 int offset = p->getSyscallArg(tc, index); 1471 1472 if (is_mmap2) 1473 offset *= TheISA::PageBytes; 1474 1475 if (start & (TheISA::PageBytes - 1) || 1476 offset & (TheISA::PageBytes - 1) || 1477 (tgt_flags & OS::TGT_MAP_PRIVATE && 1478 tgt_flags & OS::TGT_MAP_SHARED) || 1479 (!(tgt_flags & OS::TGT_MAP_PRIVATE) && 1480 !(tgt_flags & OS::TGT_MAP_SHARED)) || 1481 !length) { 1482 return -EINVAL; 1483 } 1484 1485 if ((prot & PROT_WRITE) && (tgt_flags & OS::TGT_MAP_SHARED)) { 1486 // With shared mmaps, there are two cases to consider: 1487 // 1) anonymous: writes should modify the mapping and this should be 1488 // visible to observers who share the mapping. Currently, it's 1489 // difficult to update the shared mapping because there's no 1490 // structure which maintains information about the which virtual 1491 // memory areas are shared. If that structure existed, it would be 1492 // possible to make the translations point to the same frames. 1493 // 2) file-backed: writes should modify the mapping and the file 1494 // which is backed by the mapping. The shared mapping problem is the 1495 // same as what was mentioned about the anonymous mappings. For 1496 // file-backed mappings, the writes to the file are difficult 1497 // because it requires syncing what the mapping holds with the file 1498 // that resides on the host system. So, any write on a real system 1499 // would cause the change to be propagated to the file mapping at 1500 // some point in the future (the inode is tracked along with the 1501 // mapping). This isn't guaranteed to always happen, but it usually 1502 // works well enough. The guarantee is provided by the msync system 1503 // call. We could force the change through with shared mappings with 1504 // a call to msync, but that again would require more information 1505 // than we currently maintain. 1506 warn("mmap: writing to shared mmap region is currently " 1507 "unsupported. The write succeeds on the target, but it " 1508 "will not be propagated to the host or shared mappings"); 1509 } 1510 1511 length = roundUp(length, TheISA::PageBytes); 1512 1513 int sim_fd = -1; 1514 uint8_t *pmap = nullptr; 1515 if (!(tgt_flags & OS::TGT_MAP_ANONYMOUS)) { 1516 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1517 1518 auto dfdp = std::dynamic_pointer_cast<DeviceFDEntry>(fdep); 1519 if (dfdp) { 1520 EmulatedDriver *emul_driver = dfdp->getDriver(); 1521 return emul_driver->mmap(p, tc, start, length, prot, 1522 tgt_flags, tgt_fd, offset); 1523 } 1524 1525 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1526 if (!ffdp) 1527 return -EBADF; 1528 sim_fd = ffdp->getSimFD(); 1529 1530 pmap = (decltype(pmap))mmap(nullptr, length, PROT_READ, MAP_PRIVATE, 1531 sim_fd, offset); 1532 1533 if (pmap == (decltype(pmap))-1) { 1534 warn("mmap: failed to map file into host address space"); 1535 return -errno; 1536 } 1537 } 1538 1539 // Extend global mmap region if necessary. Note that we ignore the 1540 // start address unless MAP_FIXED is specified. 1541 if (!(tgt_flags & OS::TGT_MAP_FIXED)) { 1542 std::shared_ptr<MemState> mem_state = p->memState; 1543 Addr mmap_end = mem_state->getMmapEnd(); 1544 1545 start = p->mmapGrowsDown() ? mmap_end - length : mmap_end; 1546 mmap_end = p->mmapGrowsDown() ? start : mmap_end + length; 1547 1548 mem_state->setMmapEnd(mmap_end); 1549 } 1550 1551 DPRINTF_SYSCALL(Verbose, " mmap range is 0x%x - 0x%x\n", 1552 start, start + length - 1); 1553 1554 // We only allow mappings to overwrite existing mappings if 1555 // TGT_MAP_FIXED is set. Otherwise it shouldn't be a problem 1556 // because we ignore the start hint if TGT_MAP_FIXED is not set. 1557 int clobber = tgt_flags & OS::TGT_MAP_FIXED; 1558 if (clobber) { 1559 for (auto tc : p->system->threadContexts) { 1560 // If we might be overwriting old mappings, we need to 1561 // invalidate potentially stale mappings out of the TLBs. 1562 tc->getDTBPtr()->flushAll(); 1563 tc->getITBPtr()->flushAll(); 1564 } 1565 } 1566 1567 // Allocate physical memory and map it in. If the page table is already 1568 // mapped and clobber is not set, the simulator will issue throw a 1569 // fatal and bail out of the simulation. 1570 p->allocateMem(start, length, clobber); 1571 1572 // Transfer content into target address space. 1573 SETranslatingPortProxy &tp = tc->getMemProxy(); 1574 if (tgt_flags & OS::TGT_MAP_ANONYMOUS) { 1575 // In general, we should zero the mapped area for anonymous mappings, 1576 // with something like: 1577 // tp.memsetBlob(start, 0, length); 1578 // However, given that we don't support sparse mappings, and 1579 // some applications can map a couple of gigabytes of space 1580 // (intending sparse usage), that can get painfully expensive. 1581 // Fortunately, since we don't properly implement munmap either, 1582 // there's no danger of remapping used memory, so for now all 1583 // newly mapped memory should already be zeroed so we can skip it. 1584 } else { 1585 // It is possible to mmap an area larger than a file, however 1586 // accessing unmapped portions the system triggers a "Bus error" 1587 // on the host. We must know when to stop copying the file from 1588 // the host into the target address space. 1589 struct stat file_stat; 1590 if (fstat(sim_fd, &file_stat) > 0) 1591 fatal("mmap: cannot stat file"); 1592 1593 // Copy the portion of the file that is resident. This requires 1594 // checking both the mmap size and the filesize that we are 1595 // trying to mmap into this space; the mmap size also depends 1596 // on the specified offset into the file. 1597 uint64_t size = std::min((uint64_t)file_stat.st_size - offset, 1598 length); 1599 tp.writeBlob(start, pmap, size); 1600 1601 // Cleanup the mmap region before exiting this function. 1602 munmap(pmap, length); 1603 1604 // Maintain the symbol table for dynamic executables. 1605 // The loader will call mmap to map the images into its address 1606 // space and we intercept that here. We can verify that we are 1607 // executing inside the loader by checking the program counter value. 1608 // XXX: with multiprogrammed workloads or multi-node configurations, 1609 // this will not work since there is a single global symbol table. 1610 ObjectFile *interpreter = p->getInterpreter(); 1611 if (interpreter) { 1612 Addr text_start = interpreter->textBase(); 1613 Addr text_end = text_start + interpreter->textSize(); 1614 1615 Addr pc = tc->pcState().pc(); 1616 1617 if (pc >= text_start && pc < text_end) { 1618 std::shared_ptr<FDEntry> fdep = (*p->fds)[tgt_fd]; 1619 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>(fdep); 1620 ObjectFile *lib = createObjectFile(ffdp->getFileName()); 1621 1622 if (lib) { 1623 lib->loadAllSymbols(debugSymbolTable, 1624 lib->textBase(), start); 1625 } 1626 } 1627 } 1628 1629 // Note that we do not zero out the remainder of the mapping. This 1630 // is done by a real system, but it probably will not affect 1631 // execution (hopefully). 1632 } 1633 1634 return start; 1635} 1636 1637template <class OS> 1638SyscallReturn 1639pwrite64Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1640{ 1641 int index = 0; 1642 int tgt_fd = p->getSyscallArg(tc, index); 1643 Addr bufPtr = p->getSyscallArg(tc, index); 1644 int nbytes = p->getSyscallArg(tc, index); 1645 int offset = p->getSyscallArg(tc, index); 1646 1647 auto ffdp = std::dynamic_pointer_cast<FileFDEntry>((*p->fds)[tgt_fd]); 1648 if (!ffdp) 1649 return -EBADF; 1650 int sim_fd = ffdp->getSimFD(); 1651 1652 BufferArg bufArg(bufPtr, nbytes); 1653 bufArg.copyIn(tc->getMemProxy()); 1654 1655 int bytes_written = pwrite(sim_fd, bufArg.bufferPtr(), nbytes, offset); 1656 1657 return (bytes_written == -1) ? -errno : bytes_written; 1658} 1659 1660/// Target mmap() handler. 1661template <class OS> 1662SyscallReturn 1663mmapFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1664{ 1665 return mmapImpl<OS>(desc, num, p, tc, false); 1666} 1667 1668/// Target mmap2() handler. 1669template <class OS> 1670SyscallReturn 1671mmap2Func(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1672{ 1673 return mmapImpl<OS>(desc, num, p, tc, true); 1674} 1675 1676/// Target getrlimit() handler. 1677template <class OS> 1678SyscallReturn 1679getrlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1680 ThreadContext *tc) 1681{ 1682 int index = 0; 1683 unsigned resource = process->getSyscallArg(tc, index); 1684 TypedBufferArg<typename OS::rlimit> rlp(process->getSyscallArg(tc, index)); 1685 1686 switch (resource) { 1687 case OS::TGT_RLIMIT_STACK: 1688 // max stack size in bytes: make up a number (8MB for now) 1689 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1690 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1691 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1692 break; 1693 1694 case OS::TGT_RLIMIT_DATA: 1695 // max data segment size in bytes: make up a number 1696 rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; 1697 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1698 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1699 break; 1700 1701 default: 1702 warn("getrlimit: unimplemented resource %d", resource); 1703 return -EINVAL; 1704 break; 1705 } 1706 1707 rlp.copyOut(tc->getMemProxy()); 1708 return 0; 1709} 1710 1711template <class OS> 1712SyscallReturn 1713prlimitFunc(SyscallDesc *desc, int callnum, Process *process, 1714 ThreadContext *tc) 1715{ 1716 int index = 0; 1717 if (process->getSyscallArg(tc, index) != 0) 1718 { 1719 warn("prlimit: ignoring rlimits for nonzero pid"); 1720 return -EPERM; 1721 } 1722 int resource = process->getSyscallArg(tc, index); 1723 Addr n = process->getSyscallArg(tc, index); 1724 if (n != 0) 1725 warn("prlimit: ignoring new rlimit"); 1726 Addr o = process->getSyscallArg(tc, index); 1727 if (o != 0) 1728 { 1729 TypedBufferArg<typename OS::rlimit> rlp(o); 1730 switch (resource) { 1731 case OS::TGT_RLIMIT_STACK: 1732 // max stack size in bytes: make up a number (8MB for now) 1733 rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; 1734 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1735 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1736 break; 1737 case OS::TGT_RLIMIT_DATA: 1738 // max data segment size in bytes: make up a number 1739 rlp->rlim_cur = rlp->rlim_max = 256*1024*1024; 1740 rlp->rlim_cur = TheISA::htog(rlp->rlim_cur); 1741 rlp->rlim_max = TheISA::htog(rlp->rlim_max); 1742 break; 1743 default: 1744 warn("prlimit: unimplemented resource %d", resource); 1745 return -EINVAL; 1746 break; 1747 } 1748 rlp.copyOut(tc->getMemProxy()); 1749 } 1750 return 0; 1751} 1752 1753/// Target clock_gettime() function. 1754template <class OS> 1755SyscallReturn 1756clock_gettimeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1757{ 1758 int index = 1; 1759 //int clk_id = p->getSyscallArg(tc, index); 1760 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1761 1762 getElapsedTimeNano(tp->tv_sec, tp->tv_nsec); 1763 tp->tv_sec += seconds_since_epoch; 1764 tp->tv_sec = TheISA::htog(tp->tv_sec); 1765 tp->tv_nsec = TheISA::htog(tp->tv_nsec); 1766 1767 tp.copyOut(tc->getMemProxy()); 1768 1769 return 0; 1770} 1771 1772/// Target clock_getres() function. 1773template <class OS> 1774SyscallReturn 1775clock_getresFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) 1776{ 1777 int index = 1; 1778 TypedBufferArg<typename OS::timespec> tp(p->getSyscallArg(tc, index)); 1779 1780 // Set resolution at ns, which is what clock_gettime() returns 1781 tp->tv_sec = 0; 1782 tp->tv_nsec = 1; 1783 1784 tp.copyOut(tc->getMemProxy()); 1785 1786 return 0; 1787} 1788 1789/// Target gettimeofday() handler. 1790template <class OS> 1791SyscallReturn 1792gettimeofdayFunc(SyscallDesc *desc, int callnum, Process *process, 1793 ThreadContext *tc) 1794{ 1795 int index = 0; 1796 TypedBufferArg<typename OS::timeval> tp(process->getSyscallArg(tc, index)); 1797 1798 getElapsedTimeMicro(tp->tv_sec, tp->tv_usec); 1799 tp->tv_sec += seconds_since_epoch; 1800 tp->tv_sec = TheISA::htog(tp->tv_sec); 1801 tp->tv_usec = TheISA::htog(tp->tv_usec); 1802 1803 tp.copyOut(tc->getMemProxy()); 1804 1805 return 0; 1806} 1807 1808 1809/// Target utimes() handler. 1810template <class OS> 1811SyscallReturn 1812utimesFunc(SyscallDesc *desc, int callnum, Process *process, 1813 ThreadContext *tc) 1814{ 1815 std::string path; 1816 1817 int index = 0; 1818 if (!tc->getMemProxy().tryReadString(path, 1819 process->getSyscallArg(tc, index))) { 1820 return -EFAULT; 1821 } 1822 1823 TypedBufferArg<typename OS::timeval [2]> 1824 tp(process->getSyscallArg(tc, index)); 1825 tp.copyIn(tc->getMemProxy()); 1826 1827 struct timeval hostTimeval[2]; 1828 for (int i = 0; i < 2; ++i) { 1829 hostTimeval[i].tv_sec = TheISA::gtoh((*tp)[i].tv_sec); 1830 hostTimeval[i].tv_usec = TheISA::gtoh((*tp)[i].tv_usec); 1831 } 1832 1833 // Adjust path for current working directory 1834 path = process->fullPath(path); 1835 1836 int result = utimes(path.c_str(), hostTimeval); 1837 1838 if (result < 0) 1839 return -errno; 1840 1841 return 0; 1842} 1843 1844template <class OS> 1845SyscallReturn 1846execveFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) 1847{ 1848 desc->setFlags(0); 1849 1850 int index = 0; 1851 std::string path; 1852 SETranslatingPortProxy & mem_proxy = tc->getMemProxy(); 1853 if (!mem_proxy.tryReadString(path, p->getSyscallArg(tc, index))) 1854 return -EFAULT; 1855 1856 if (access(path.c_str(), F_OK) == -1) 1857 return -EACCES; 1858 1859 auto read_in = [](std::vector<std::string> & vect, 1860 SETranslatingPortProxy & mem_proxy, 1861 Addr mem_loc) 1862 { 1863 for (int inc = 0; ; inc++) { 1864 BufferArg b((mem_loc + sizeof(Addr) * inc), sizeof(Addr)); 1865 b.copyIn(mem_proxy); 1866 1867 if (!*(Addr*)b.bufferPtr()) 1868 break; 1869 1870 vect.push_back(std::string()); 1871 mem_proxy.tryReadString(vect[inc], *(Addr*)b.bufferPtr()); 1872 } 1873 }; 1874 1875 /** 1876 * Note that ProcessParams is generated by swig and there are no other 1877 * examples of how to create anything but this default constructor. The 1878 * fields are manually initialized instead of passing parameters to the 1879 * constructor. 1880 */ 1881 ProcessParams *pp = new ProcessParams(); 1882 pp->executable = path; 1883 Addr argv_mem_loc = p->getSyscallArg(tc, index); 1884 read_in(pp->cmd, mem_proxy, argv_mem_loc); 1885 Addr envp_mem_loc = p->getSyscallArg(tc, index); 1886 read_in(pp->env, mem_proxy, envp_mem_loc); 1887 pp->uid = p->uid(); 1888 pp->egid = p->egid(); 1889 pp->euid = p->euid(); 1890 pp->gid = p->gid(); 1891 pp->ppid = p->ppid(); 1892 pp->pid = p->pid(); 1893 pp->input.assign("cin"); 1894 pp->output.assign("cout"); 1895 pp->errout.assign("cerr"); 1896 pp->cwd.assign(p->getcwd()); 1897 pp->system = p->system; 1898 /** 1899 * Prevent process object creation with identical PIDs (which will trip 1900 * a fatal check in Process constructor). The execve call is supposed to 1901 * take over the currently executing process' identity but replace 1902 * whatever it is doing with a new process image. Instead of hijacking 1903 * the process object in the simulator, we create a new process object 1904 * and bind to the previous process' thread below (hijacking the thread). 1905 */ 1906 p->system->PIDs.erase(p->pid()); 1907 Process *new_p = pp->create(); 1908 delete pp; 1909 1910 /** 1911 * Work through the file descriptor array and close any files marked 1912 * close-on-exec. 1913 */ 1914 new_p->fds = p->fds; 1915 for (int i = 0; i < new_p->fds->getSize(); i++) { 1916 std::shared_ptr<FDEntry> fdep = (*new_p->fds)[i]; 1917 if (fdep && fdep->getCOE()) 1918 new_p->fds->closeFDEntry(i); 1919 } 1920 1921 *new_p->sigchld = true; 1922 1923 delete p; 1924 tc->clearArchRegs(); 1925 tc->setProcessPtr(new_p); 1926 new_p->assignThreadContext(tc->contextId()); 1927 new_p->initState(); 1928 tc->activate(); 1929 TheISA::PCState pcState = tc->pcState(); 1930 tc->setNPC(pcState.instAddr()); 1931 1932 desc->setFlags(SyscallDesc::SuppressReturnValue); 1933 return 0; 1934} 1935 1936/// Target getrusage() function. 1937template <class OS> 1938SyscallReturn 1939getrusageFunc(SyscallDesc *desc, int callnum, Process *process, 1940 ThreadContext *tc) 1941{ 1942 int index = 0; 1943 int who = process->getSyscallArg(tc, index); // THREAD, SELF, or CHILDREN 1944 TypedBufferArg<typename OS::rusage> rup(process->getSyscallArg(tc, index)); 1945 1946 rup->ru_utime.tv_sec = 0; 1947 rup->ru_utime.tv_usec = 0; 1948 rup->ru_stime.tv_sec = 0; 1949 rup->ru_stime.tv_usec = 0; 1950 rup->ru_maxrss = 0; 1951 rup->ru_ixrss = 0; 1952 rup->ru_idrss = 0; 1953 rup->ru_isrss = 0; 1954 rup->ru_minflt = 0; 1955 rup->ru_majflt = 0; 1956 rup->ru_nswap = 0; 1957 rup->ru_inblock = 0; 1958 rup->ru_oublock = 0; 1959 rup->ru_msgsnd = 0; 1960 rup->ru_msgrcv = 0; 1961 rup->ru_nsignals = 0; 1962 rup->ru_nvcsw = 0; 1963 rup->ru_nivcsw = 0; 1964 1965 switch (who) { 1966 case OS::TGT_RUSAGE_SELF: 1967 getElapsedTimeMicro(rup->ru_utime.tv_sec, rup->ru_utime.tv_usec); 1968 rup->ru_utime.tv_sec = TheISA::htog(rup->ru_utime.tv_sec); 1969 rup->ru_utime.tv_usec = TheISA::htog(rup->ru_utime.tv_usec); 1970 break; 1971 1972 case OS::TGT_RUSAGE_CHILDREN: 1973 // do nothing. We have no child processes, so they take no time. 1974 break; 1975 1976 default: 1977 // don't really handle THREAD or CHILDREN, but just warn and 1978 // plow ahead 1979 warn("getrusage() only supports RUSAGE_SELF. Parameter %d ignored.", 1980 who); 1981 } 1982 1983 rup.copyOut(tc->getMemProxy()); 1984 1985 return 0; 1986} 1987 1988/// Target times() function. 1989template <class OS> 1990SyscallReturn 1991timesFunc(SyscallDesc *desc, int callnum, Process *process, 1992 ThreadContext *tc) 1993{ 1994 int index = 0; 1995 TypedBufferArg<typename OS::tms> bufp(process->getSyscallArg(tc, index)); 1996 1997 // Fill in the time structure (in clocks) 1998 int64_t clocks = curTick() * OS::M5_SC_CLK_TCK / SimClock::Int::s; 1999 bufp->tms_utime = clocks; 2000 bufp->tms_stime = 0; 2001 bufp->tms_cutime = 0; 2002 bufp->tms_cstime = 0; 2003 2004 // Convert to host endianness 2005 bufp->tms_utime = TheISA::htog(bufp->tms_utime); 2006 2007 // Write back 2008 bufp.copyOut(tc->getMemProxy()); 2009 2010 // Return clock ticks since system boot 2011 return clocks; 2012} 2013 2014/// Target time() function. 2015template <class OS> 2016SyscallReturn 2017timeFunc(SyscallDesc *desc, int callnum, Process *process, ThreadContext *tc) 2018{ 2019 typename OS::time_t sec, usec; 2020 getElapsedTimeMicro(sec, usec); 2021 sec += seconds_since_epoch; 2022 2023 int index = 0; 2024 Addr taddr = (Addr)process->getSyscallArg(tc, index); 2025 if (taddr != 0) { 2026 typename OS::time_t t = sec; 2027 t = TheISA::htog(t); 2028 SETranslatingPortProxy &p = tc->getMemProxy(); 2029 p.writeBlob(taddr, (uint8_t*)&t, (int)sizeof(typename OS::time_t)); 2030 } 2031 return sec; 2032} 2033 2034template <class OS> 2035SyscallReturn 2036tgkillFunc(SyscallDesc *desc, int num, Process *process, ThreadContext *tc) 2037{ 2038 int index = 0; 2039 int tgid = process->getSyscallArg(tc, index); 2040 int tid = process->getSyscallArg(tc, index); 2041 int sig = process->getSyscallArg(tc, index); 2042 2043 /** 2044 * This system call is intended to allow killing a specific thread 2045 * within an arbitrary thread group if sanctioned with permission checks. 2046 * It's usually true that threads share the termination signal as pointed 2047 * out by the pthread_kill man page and this seems to be the intended 2048 * usage. Due to this being an emulated environment, assume the following: 2049 * Threads are allowed to call tgkill because the EUID for all threads 2050 * should be the same. There is no signal handling mechanism for kernel 2051 * registration of signal handlers since signals are poorly supported in 2052 * emulation mode. Since signal handlers cannot be registered, all 2053 * threads within in a thread group must share the termination signal. 2054 * We never exhaust PIDs so there's no chance of finding the wrong one 2055 * due to PID rollover. 2056 */ 2057 2058 System *sys = tc->getSystemPtr(); 2059 Process *tgt_proc = nullptr; 2060 for (int i = 0; i < sys->numContexts(); i++) { 2061 Process *temp = sys->threadContexts[i]->getProcessPtr(); 2062 if (temp->pid() == tid) { 2063 tgt_proc = temp; 2064 break; 2065 } 2066 } 2067 2068 if (sig != 0 || sig != OS::TGT_SIGABRT) 2069 return -EINVAL; 2070 2071 if (tgt_proc == nullptr) 2072 return -ESRCH; 2073 2074 if (tgid != -1 && tgt_proc->tgid() != tgid) 2075 return -ESRCH; 2076 2077 if (sig == OS::TGT_SIGABRT) 2078 exitGroupFunc(desc, 252, process, tc); 2079 2080 return 0; 2081} 2082 2083 2084#endif // __SIM_SYSCALL_EMUL_HH__ 2085