1 use core::{ 2 ffi::{c_int, c_void}, 3 ptr::null, 4 sync::atomic::{AtomicBool, Ordering}, 5 }; 6 7 use crate::{ 8 arch::{ipc::signal::SigSet, syscall::nr::*}, 9 filesystem::vfs::syscall::{PosixStatfs, PosixStatx}, 10 ipc::shm::{ShmCtlCmd, ShmFlags, ShmId, ShmKey}, 11 libs::{futex::constant::FutexFlag, rand::GRandFlags}, 12 mm::{page::PAGE_4K_SIZE, syscall::MremapFlags}, 13 net::syscall::MsgHdr, 14 process::{ 15 fork::KernelCloneArgs, 16 resource::{RLimit64, RUsage}, 17 ProcessFlags, ProcessManager, 18 }, 19 sched::{schedule, SchedMode}, 20 syscall::user_access::check_and_clone_cstr, 21 }; 22 23 use log::{info, warn}; 24 use num_traits::FromPrimitive; 25 use system_error::SystemError; 26 27 use crate::{ 28 arch::{cpu::cpu_reset, interrupt::TrapFrame, MMArch}, 29 filesystem::vfs::{ 30 fcntl::{AtFlags, FcntlCommand}, 31 file::FileMode, 32 syscall::{ModeType, PosixKstat, UtimensFlags}, 33 MAX_PATHLEN, 34 }, 35 libs::align::page_align_up, 36 mm::{verify_area, MemoryManagementArch, VirtAddr}, 37 net::syscall::SockAddr, 38 process::{fork::CloneFlags, syscall::PosixOldUtsName, Pid}, 39 time::{ 40 syscall::{PosixTimeZone, PosixTimeval}, 41 PosixTimeSpec, 42 }, 43 }; 44 45 use self::{ 46 misc::SysInfo, 47 user_access::{UserBufferReader, UserBufferWriter}, 48 }; 49 50 pub mod misc; 51 pub mod user_access; 52 53 // 与linux不一致的调用，在linux基础上累加 54 pub const SYS_PUT_STRING: usize = 100000; 55 pub const SYS_SBRK: usize = 100001; 56 /// todo: 该系统调用与Linux不一致，将来需要删除该系统调用！！！ 删的时候记得改C版本的libc 57 pub const SYS_CLOCK: usize = 100002; 58 pub const SYS_SCHED: usize = 100003; 59 60 #[derive(Debug)] 61 pub struct Syscall; 62 63 impl Syscall { 64 /// 初始化系统调用 65 #[inline(never)] 66 pub fn init() -> Result<(), SystemError> { 67 static INIT_FLAG: AtomicBool = AtomicBool::new(false); 68 let prev = INIT_FLAG.swap(true, Ordering::SeqCst); 69 if prev { 70 panic!("Cannot initialize syscall more than once!"); 71 } 72 info!("Initializing syscall..."); 73 let r = crate::arch::syscall::arch_syscall_init(); 74 info!("Syscall init successfully!"); 75 76 return r; 77 } 78 /// @brief 系统调用分发器，用于分发系统调用。 79 /// 80 /// 这个函数内，需要根据系统调用号，调用对应的系统调用处理函数。 81 /// 并且，对于用户态传入的指针参数，需要在本函数内进行越界检查，防止访问到内核空间。 82 #[inline(never)] 83 pub fn handle( 84 syscall_num: usize, 85 args: &[usize], 86 frame: &mut TrapFrame, 87 ) -> Result<usize, SystemError> { 88 let r = match syscall_num { 89 SYS_PUT_STRING => { 90 Self::put_string(args[0] as *const u8, args[1] as u32, args[2] as u32) 91 } 92 #[cfg(target_arch = "x86_64")] 93 SYS_OPEN => { 94 let path = args[0] as *const u8; 95 let flags = args[1] as u32; 96 let mode = args[2] as u32; 97 98 Self::open(path, flags, mode, true) 99 } 100 101 #[cfg(target_arch = "x86_64")] 102 SYS_RENAME => { 103 let oldname: *const u8 = args[0] as *const u8; 104 let newname: *const u8 = args[1] as *const u8; 105 Self::do_renameat2( 106 AtFlags::AT_FDCWD.bits(), 107 oldname, 108 AtFlags::AT_FDCWD.bits(), 109 newname, 110 0, 111 ) 112 } 113 114 #[cfg(target_arch = "x86_64")] 115 SYS_RENAMEAT => { 116 let oldfd = args[0] as i32; 117 let oldname: *const u8 = args[1] as *const u8; 118 let newfd = args[2] as i32; 119 let newname: *const u8 = args[3] as *const u8; 120 Self::do_renameat2(oldfd, oldname, newfd, newname, 0) 121 } 122 123 SYS_RENAMEAT2 => { 124 let oldfd = args[0] as i32; 125 let oldname: *const u8 = args[1] as *const u8; 126 let newfd = args[2] as i32; 127 let newname: *const u8 = args[3] as *const u8; 128 let flags = args[4] as u32; 129 Self::do_renameat2(oldfd, oldname, newfd, newname, flags) 130 } 131 132 SYS_OPENAT => { 133 let dirfd = args[0] as i32; 134 let path = args[1] as *const u8; 135 let flags = args[2] as u32; 136 let mode = args[3] as u32; 137 138 Self::openat(dirfd, path, flags, mode, true) 139 } 140 SYS_CLOSE => { 141 let fd = args[0]; 142 Self::close(fd) 143 } 144 SYS_READ => { 145 let fd = args[0] as i32; 146 let buf_vaddr = args[1]; 147 let len = args[2]; 148 let from_user = frame.is_from_user(); 149 let mut user_buffer_writer = 150 UserBufferWriter::new(buf_vaddr as *mut u8, len, from_user)?; 151 152 let user_buf = user_buffer_writer.buffer(0)?; 153 Self::read(fd, user_buf) 154 } 155 SYS_WRITE => { 156 let fd = args[0] as i32; 157 let buf_vaddr = args[1]; 158 let len = args[2]; 159 let from_user = frame.is_from_user(); 160 let user_buffer_reader = 161 UserBufferReader::new(buf_vaddr as *const u8, len, from_user)?; 162 163 let user_buf = user_buffer_reader.read_from_user(0)?; 164 Self::write(fd, user_buf) 165 } 166 167 SYS_LSEEK => { 168 let fd = args[0] as i32; 169 let offset = args[1] as i64; 170 let whence = args[2] as u32; 171 172 Self::lseek(fd, offset, whence) 173 } 174 175 SYS_PREAD64 => { 176 let fd = args[0] as i32; 177 let buf_vaddr = args[1]; 178 let len = args[2]; 179 let offset = args[3]; 180 181 let mut user_buffer_writer = 182 UserBufferWriter::new(buf_vaddr as *mut u8, len, frame.is_from_user())?; 183 let buf = user_buffer_writer.buffer(0)?; 184 Self::pread(fd, buf, len, offset) 185 } 186 187 SYS_PWRITE64 => { 188 let fd = args[0] as i32; 189 let buf_vaddr = args[1]; 190 let len = args[2]; 191 let offset = args[3]; 192 193 let user_buffer_reader = 194 UserBufferReader::new(buf_vaddr as *const u8, len, frame.is_from_user())?; 195 196 let buf = user_buffer_reader.read_from_user(0)?; 197 Self::pwrite(fd, buf, len, offset) 198 } 199 200 SYS_IOCTL => { 201 let fd = args[0]; 202 let cmd = args[1]; 203 let data = args[2]; 204 Self::ioctl(fd, cmd as u32, data) 205 } 206 207 #[cfg(target_arch = "x86_64")] 208 SYS_FORK => Self::fork(frame), 209 #[cfg(target_arch = "x86_64")] 210 SYS_VFORK => Self::vfork(frame), 211 212 SYS_BRK => { 213 let new_brk = VirtAddr::new(args[0]); 214 Self::brk(new_brk).map(|vaddr| vaddr.data()) 215 } 216 217 SYS_SBRK => { 218 let increment = args[0] as isize; 219 Self::sbrk(increment).map(|vaddr: VirtAddr| vaddr.data()) 220 } 221 222 SYS_REBOOT => Self::reboot(), 223 224 SYS_CHDIR => { 225 let r = args[0] as *const u8; 226 Self::chdir(r) 227 } 228 229 #[allow(unreachable_patterns)] 230 SYS_GETDENTS64 | SYS_GETDENTS => { 231 let fd = args[0] as i32; 232 233 let buf_vaddr = args[1]; 234 let len = args[2]; 235 let virt_addr: VirtAddr = VirtAddr::new(buf_vaddr); 236 // 判断缓冲区是否来自用户态，进行权限校验 237 let res = if frame.is_from_user() && verify_area(virt_addr, len).is_err() { 238 // 来自用户态，而buffer在内核态，这样的操作不被允许 239 Err(SystemError::EPERM) 240 } else if buf_vaddr == 0 { 241 Err(SystemError::EFAULT) 242 } else { 243 let buf: &mut [u8] = unsafe { 244 core::slice::from_raw_parts_mut::<'static, u8>(buf_vaddr as *mut u8, len) 245 }; 246 Self::getdents(fd, buf) 247 }; 248 249 res 250 } 251 252 SYS_EXECVE => { 253 let path_ptr = args[0]; 254 let argv_ptr = args[1]; 255 let env_ptr = args[2]; 256 let virt_path_ptr = VirtAddr::new(path_ptr); 257 let virt_argv_ptr = VirtAddr::new(argv_ptr); 258 let virt_env_ptr = VirtAddr::new(env_ptr); 259 // 权限校验 260 if frame.is_from_user() 261 && (verify_area(virt_path_ptr, MAX_PATHLEN).is_err() 262 || verify_area(virt_argv_ptr, PAGE_4K_SIZE).is_err()) 263 || verify_area(virt_env_ptr, PAGE_4K_SIZE).is_err() 264 { 265 Err(SystemError::EFAULT) 266 } else { 267 Self::execve( 268 path_ptr as *const u8, 269 argv_ptr as *const *const u8, 270 env_ptr as *const *const u8, 271 frame, 272 ) 273 .map(|_| 0) 274 } 275 } 276 SYS_WAIT4 => { 277 let pid = args[0] as i32; 278 let wstatus = args[1] as *mut i32; 279 let options = args[2] as c_int; 280 let rusage = args[3] as *mut c_void; 281 // 权限校验 282 // todo: 引入rusage之后，更正以下权限校验代码中，rusage的大小 283 Self::wait4(pid.into(), wstatus, options, rusage) 284 } 285 286 SYS_EXIT => { 287 let exit_code = args[0]; 288 Self::exit(exit_code) 289 } 290 #[cfg(target_arch = "x86_64")] 291 SYS_MKDIR => { 292 let path = args[0] as *const u8; 293 let mode = args[1]; 294 295 Self::mkdir(path, mode) 296 } 297 298 SYS_MKDIRAT => { 299 let dirfd = args[0] as i32; 300 let path = args[1] as *const u8; 301 let mode = args[2]; 302 Self::mkdir_at(dirfd, path, mode) 303 } 304 305 SYS_NANOSLEEP => { 306 let req = args[0] as *const PosixTimeSpec; 307 let rem = args[1] as *mut PosixTimeSpec; 308 let virt_req = VirtAddr::new(req as usize); 309 let virt_rem = VirtAddr::new(rem as usize); 310 if frame.is_from_user() 311 && (verify_area(virt_req, core::mem::size_of::<PosixTimeSpec>()).is_err() 312 || verify_area(virt_rem, core::mem::size_of::<PosixTimeSpec>()).is_err()) 313 { 314 Err(SystemError::EFAULT) 315 } else { 316 Self::nanosleep(req, rem) 317 } 318 } 319 320 SYS_CLOCK => Self::clock(), 321 #[cfg(target_arch = "x86_64")] 322 SYS_PIPE => { 323 let pipefd: *mut i32 = args[0] as *mut c_int; 324 if pipefd.is_null() { 325 Err(SystemError::EFAULT) 326 } else { 327 Self::pipe2(pipefd, FileMode::empty()) 328 } 329 } 330 331 SYS_PIPE2 => { 332 let pipefd: *mut i32 = args[0] as *mut c_int; 333 let arg1 = args[1]; 334 if pipefd.is_null() { 335 Err(SystemError::EFAULT) 336 } else { 337 let flags = FileMode::from_bits_truncate(arg1 as u32); 338 Self::pipe2(pipefd, flags) 339 } 340 } 341 342 SYS_UNLINKAT => { 343 let dirfd = args[0] as i32; 344 let path = args[1] as *const u8; 345 let flags = args[2] as u32; 346 Self::unlinkat(dirfd, path, flags) 347 } 348 349 #[cfg(target_arch = "x86_64")] 350 SYS_RMDIR => { 351 let path = args[0] as *const u8; 352 Self::rmdir(path) 353 } 354 355 #[cfg(target_arch = "x86_64")] 356 SYS_LINK => { 357 let old = args[0] as *const u8; 358 let new = args[1] as *const u8; 359 return Self::link(old, new); 360 } 361 362 SYS_LINKAT => { 363 let oldfd = args[0] as i32; 364 let old = args[1] as *const u8; 365 let newfd = args[2] as i32; 366 let new = args[3] as *const u8; 367 let flags = args[4] as i32; 368 return Self::linkat(oldfd, old, newfd, new, flags); 369 } 370 371 #[cfg(target_arch = "x86_64")] 372 SYS_UNLINK => { 373 let path = args[0] as *const u8; 374 Self::unlink(path) 375 } 376 SYS_KILL => { 377 let pid = Pid::new(args[0]); 378 let sig = args[1] as c_int; 379 // debug!("KILL SYSCALL RECEIVED"); 380 Self::kill(pid, sig) 381 } 382 383 SYS_RT_SIGACTION => { 384 let sig = args[0] as c_int; 385 let act = args[1]; 386 let old_act = args[2]; 387 Self::sigaction(sig, act, old_act, frame.is_from_user()) 388 } 389 390 SYS_GETPID => Self::getpid().map(|pid| pid.into()), 391 392 SYS_SCHED => { 393 warn!("syscall sched"); 394 schedule(SchedMode::SM_NONE); 395 Ok(0) 396 } 397 SYS_DUP => { 398 let oldfd: i32 = args[0] as c_int; 399 Self::dup(oldfd) 400 } 401 402 #[cfg(target_arch = "x86_64")] 403 SYS_DUP2 => { 404 let oldfd: i32 = args[0] as c_int; 405 let newfd: i32 = args[1] as c_int; 406 Self::dup2(oldfd, newfd) 407 } 408 409 SYS_DUP3 => { 410 let oldfd: i32 = args[0] as c_int; 411 let newfd: i32 = args[1] as c_int; 412 let flags: u32 = args[2] as u32; 413 Self::dup3(oldfd, newfd, flags) 414 } 415 416 SYS_SOCKET => Self::socket(args[0], args[1], args[2]), 417 SYS_SETSOCKOPT => { 418 let optval = args[3] as *const u8; 419 let optlen = args[4]; 420 let virt_optval = VirtAddr::new(optval as usize); 421 // 验证optval的地址是否合法 422 if verify_area(virt_optval, optlen).is_err() { 423 // 地址空间超出了用户空间的范围，不合法 424 Err(SystemError::EFAULT) 425 } else { 426 let data: &[u8] = unsafe { core::slice::from_raw_parts(optval, optlen) }; 427 Self::setsockopt(args[0], args[1], args[2], data) 428 } 429 } 430 SYS_GETSOCKOPT => { 431 let optval = args[3] as *mut u8; 432 let optlen = args[4] as *mut usize; 433 let virt_optval = VirtAddr::new(optval as usize); 434 let virt_optlen = VirtAddr::new(optlen as usize); 435 let security_check = || { 436 // 验证optval的地址是否合法 437 if verify_area(virt_optval, PAGE_4K_SIZE).is_err() { 438 // 地址空间超出了用户空间的范围，不合法 439 return Err(SystemError::EFAULT); 440 } 441 442 // 验证optlen的地址是否合法 443 if verify_area(virt_optlen, core::mem::size_of::<u32>()).is_err() { 444 // 地址空间超出了用户空间的范围，不合法 445 return Err(SystemError::EFAULT); 446 } 447 return Ok(()); 448 }; 449 let r = security_check(); 450 if let Err(e) = r { 451 Err(e) 452 } else { 453 Self::getsockopt(args[0], args[1], args[2], optval, optlen as *mut u32) 454 } 455 } 456 457 SYS_CONNECT => { 458 let addr = args[1] as *const SockAddr; 459 let addrlen = args[2]; 460 let virt_addr = VirtAddr::new(addr as usize); 461 // 验证addr的地址是否合法 462 if verify_area(virt_addr, addrlen).is_err() { 463 // 地址空间超出了用户空间的范围，不合法 464 Err(SystemError::EFAULT) 465 } else { 466 Self::connect(args[0], addr, addrlen) 467 } 468 } 469 SYS_BIND => { 470 let addr = args[1] as *const SockAddr; 471 let addrlen = args[2]; 472 let virt_addr = VirtAddr::new(addr as usize); 473 // 验证addr的地址是否合法 474 if verify_area(virt_addr, addrlen).is_err() { 475 // 地址空间超出了用户空间的范围，不合法 476 Err(SystemError::EFAULT) 477 } else { 478 Self::bind(args[0], addr, addrlen) 479 } 480 } 481 482 SYS_SENDTO => { 483 let buf = args[1] as *const u8; 484 let len = args[2]; 485 let flags = args[3] as u32; 486 let addr = args[4] as *const SockAddr; 487 let addrlen = args[5]; 488 let virt_buf = VirtAddr::new(buf as usize); 489 let virt_addr = VirtAddr::new(addr as usize); 490 // 验证buf的地址是否合法 491 if verify_area(virt_buf, len).is_err() || verify_area(virt_addr, addrlen).is_err() { 492 // 地址空间超出了用户空间的范围，不合法 493 Err(SystemError::EFAULT) 494 } else { 495 let data: &[u8] = unsafe { core::slice::from_raw_parts(buf, len) }; 496 Self::sendto(args[0], data, flags, addr, addrlen) 497 } 498 } 499 500 SYS_RECVFROM => { 501 let buf = args[1] as *mut u8; 502 let len = args[2]; 503 let flags = args[3] as u32; 504 let addr = args[4] as *mut SockAddr; 505 let addrlen = args[5] as *mut usize; 506 let virt_buf = VirtAddr::new(buf as usize); 507 let virt_addrlen = VirtAddr::new(addrlen as usize); 508 let virt_addr = VirtAddr::new(addr as usize); 509 let security_check = || { 510 // 验证buf的地址是否合法 511 if verify_area(virt_buf, len).is_err() { 512 // 地址空间超出了用户空间的范围，不合法 513 return Err(SystemError::EFAULT); 514 } 515 516 // 验证addrlen的地址是否合法 517 if verify_area(virt_addrlen, core::mem::size_of::<u32>()).is_err() { 518 // 地址空间超出了用户空间的范围，不合法 519 return Err(SystemError::EFAULT); 520 } 521 522 if verify_area(virt_addr, core::mem::size_of::<SockAddr>()).is_err() { 523 // 地址空间超出了用户空间的范围，不合法 524 return Err(SystemError::EFAULT); 525 } 526 return Ok(()); 527 }; 528 let r = security_check(); 529 if let Err(e) = r { 530 Err(e) 531 } else { 532 let buf = unsafe { core::slice::from_raw_parts_mut(buf, len) }; 533 Self::recvfrom(args[0], buf, flags, addr, addrlen as *mut u32) 534 } 535 } 536 537 SYS_RECVMSG => { 538 let msg = args[1] as *mut MsgHdr; 539 let flags = args[2] as u32; 540 541 let mut user_buffer_writer = UserBufferWriter::new( 542 msg, 543 core::mem::size_of::<MsgHdr>(), 544 frame.is_from_user(), 545 )?; 546 let buffer = user_buffer_writer.buffer::<MsgHdr>(0)?; 547 548 let msg = &mut buffer[0]; 549 Self::recvmsg(args[0], msg, flags) 550 } 551 552 SYS_LISTEN => Self::listen(args[0], args[1]), 553 SYS_SHUTDOWN => Self::shutdown(args[0], args[1]), 554 SYS_ACCEPT => Self::accept(args[0], args[1] as *mut SockAddr, args[2] as *mut u32), 555 SYS_ACCEPT4 => Self::accept4( 556 args[0], 557 args[1] as *mut SockAddr, 558 args[2] as *mut u32, 559 args[3] as u32, 560 ), 561 SYS_GETSOCKNAME => { 562 Self::getsockname(args[0], args[1] as *mut SockAddr, args[2] as *mut u32) 563 } 564 SYS_GETPEERNAME => { 565 Self::getpeername(args[0], args[1] as *mut SockAddr, args[2] as *mut u32) 566 } 567 SYS_GETTIMEOFDAY => { 568 let timeval = args[0] as *mut PosixTimeval; 569 let timezone_ptr = args[1] as *mut PosixTimeZone; 570 Self::gettimeofday(timeval, timezone_ptr) 571 } 572 SYS_MMAP => { 573 let len = page_align_up(args[1]); 574 let virt_addr = VirtAddr::new(args[0]); 575 if verify_area(virt_addr, len).is_err() { 576 Err(SystemError::EFAULT) 577 } else { 578 Self::mmap( 579 VirtAddr::new(args[0]), 580 len, 581 args[2], 582 args[3], 583 args[4] as i32, 584 args[5], 585 ) 586 } 587 } 588 SYS_MREMAP => { 589 let old_vaddr = VirtAddr::new(args[0]); 590 let old_len = args[1]; 591 let new_len = args[2]; 592 let mremap_flags = MremapFlags::from_bits_truncate(args[3] as u8); 593 let new_vaddr = VirtAddr::new(args[4]); 594 595 Self::mremap(old_vaddr, old_len, new_len, mremap_flags, new_vaddr) 596 } 597 SYS_MUNMAP => { 598 let addr = args[0]; 599 let len = page_align_up(args[1]); 600 if addr & (MMArch::PAGE_SIZE - 1) != 0 { 601 // The addr argument is not a multiple of the page size 602 Err(SystemError::EINVAL) 603 } else { 604 Self::munmap(VirtAddr::new(addr), len) 605 } 606 } 607 SYS_MPROTECT => { 608 let addr = args[0]; 609 let len = page_align_up(args[1]); 610 if addr & (MMArch::PAGE_SIZE - 1) != 0 { 611 // The addr argument is not a multiple of the page size 612 Err(SystemError::EINVAL) 613 } else { 614 Self::mprotect(VirtAddr::new(addr), len, args[2]) 615 } 616 } 617 618 SYS_GETCWD => { 619 let buf = args[0] as *mut u8; 620 let size = args[1]; 621 let security_check = || { 622 verify_area(VirtAddr::new(buf as usize), size)?; 623 return Ok(()); 624 }; 625 let r = security_check(); 626 if let Err(e) = r { 627 Err(e) 628 } else { 629 let buf = unsafe { core::slice::from_raw_parts_mut(buf, size) }; 630 Self::getcwd(buf).map(|ptr| ptr.data()) 631 } 632 } 633 634 SYS_GETPGID => Self::getpgid(Pid::new(args[0])).map(|pid| pid.into()), 635 636 SYS_GETPPID => Self::getppid().map(|pid| pid.into()), 637 SYS_FSTAT => { 638 let fd = args[0] as i32; 639 let kstat: *mut PosixKstat = args[1] as *mut PosixKstat; 640 let vaddr = VirtAddr::new(kstat as usize); 641 // FIXME 由于c中的verify_area与rust中的verify_area重名，所以在引入时加了前缀区分 642 // TODO 应该将用了c版本的verify_area都改为rust的verify_area 643 match verify_area(vaddr, core::mem::size_of::<PosixKstat>()) { 644 Ok(_) => Self::fstat(fd, kstat), 645 Err(e) => Err(e), 646 } 647 } 648 649 SYS_FCNTL => { 650 let fd = args[0] as i32; 651 let cmd: Option<FcntlCommand> = 652 <FcntlCommand as FromPrimitive>::from_u32(args[1] as u32); 653 let arg = args[2] as i32; 654 let res = if let Some(cmd) = cmd { 655 Self::fcntl(fd, cmd, arg) 656 } else { 657 Err(SystemError::EINVAL) 658 }; 659 660 // debug!("FCNTL: fd: {}, cmd: {:?}, arg: {}, res: {:?}", fd, cmd, arg, res); 661 res 662 } 663 664 SYS_FTRUNCATE => { 665 let fd = args[0] as i32; 666 let len = args[1]; 667 let res = Self::ftruncate(fd, len); 668 // debug!("FTRUNCATE: fd: {}, len: {}, res: {:?}", fd, len, res); 669 res 670 } 671 672 #[cfg(target_arch = "x86_64")] 673 SYS_MKNOD => { 674 let path = args[0]; 675 let flags = args[1]; 676 let dev_t = args[2]; 677 let flags: ModeType = ModeType::from_bits_truncate(flags as u32); 678 Self::mknod( 679 path as *const u8, 680 flags, 681 crate::driver::base::device::device_number::DeviceNumber::from(dev_t as u32), 682 ) 683 } 684 685 SYS_CLONE => { 686 let parent_tid = VirtAddr::new(args[2]); 687 let child_tid = VirtAddr::new(args[3]); 688 689 // 地址校验 690 verify_area(parent_tid, core::mem::size_of::<i32>())?; 691 verify_area(child_tid, core::mem::size_of::<i32>())?; 692 693 let mut clone_args = KernelCloneArgs::new(); 694 clone_args.flags = CloneFlags::from_bits_truncate(args[0] as u64); 695 clone_args.stack = args[1]; 696 clone_args.parent_tid = parent_tid; 697 clone_args.child_tid = child_tid; 698 clone_args.tls = args[4]; 699 Self::clone(frame, clone_args) 700 } 701 702 SYS_FUTEX => { 703 let uaddr = VirtAddr::new(args[0]); 704 let operation = FutexFlag::from_bits(args[1] as u32).ok_or(SystemError::ENOSYS)?; 705 let val = args[2] as u32; 706 let utime = args[3]; 707 let uaddr2 = VirtAddr::new(args[4]); 708 let val3 = args[5] as u32; 709 710 let mut timespec = None; 711 if utime != 0 && operation.contains(FutexFlag::FLAGS_HAS_TIMEOUT) { 712 let reader = UserBufferReader::new( 713 utime as *const PosixTimeSpec, 714 core::mem::size_of::<PosixTimeSpec>(), 715 true, 716 )?; 717 718 timespec = Some(*reader.read_one_from_user::<PosixTimeSpec>(0)?); 719 } 720 721 Self::do_futex(uaddr, operation, val, timespec, uaddr2, utime as u32, val3) 722 } 723 724 SYS_SET_ROBUST_LIST => { 725 let head = args[0]; 726 let head_uaddr = VirtAddr::new(head); 727 let len = args[1]; 728 729 let ret = Self::set_robust_list(head_uaddr, len); 730 return ret; 731 } 732 733 SYS_GET_ROBUST_LIST => { 734 let pid = args[0]; 735 let head = args[1]; 736 let head_uaddr = VirtAddr::new(head); 737 let len_ptr = args[2]; 738 let len_ptr_uaddr = VirtAddr::new(len_ptr); 739 740 let ret = Self::get_robust_list(pid, head_uaddr, len_ptr_uaddr); 741 return ret; 742 } 743 744 SYS_READV => Self::readv(args[0] as i32, args[1], args[2]), 745 SYS_WRITEV => Self::writev(args[0] as i32, args[1], args[2]), 746 747 SYS_SET_TID_ADDRESS => Self::set_tid_address(args[0]), 748 749 #[cfg(target_arch = "x86_64")] 750 SYS_LSTAT => { 751 let path = args[0] as *const u8; 752 let kstat = args[1] as *mut PosixKstat; 753 Self::lstat(path, kstat) 754 } 755 756 #[cfg(target_arch = "x86_64")] 757 SYS_STAT => { 758 let path = args[0] as *const u8; 759 let kstat = args[1] as *mut PosixKstat; 760 Self::stat(path, kstat) 761 } 762 763 SYS_STATFS => { 764 let path = args[0] as *const u8; 765 let statfs = args[1] as *mut PosixStatfs; 766 Self::statfs(path, statfs) 767 } 768 769 SYS_FSTATFS => { 770 let fd = args[0] as i32; 771 let statfs = args[1] as *mut PosixStatfs; 772 Self::fstatfs(fd, statfs) 773 } 774 775 SYS_STATX => { 776 let fd = args[0] as i32; 777 let path = args[1] as *const u8; 778 let flags = args[2] as u32; 779 let mask = args[3] as u32; 780 let kstat = args[4] as *mut PosixStatx; 781 782 Self::do_statx(fd, path, flags, mask, kstat) 783 } 784 785 #[cfg(target_arch = "x86_64")] 786 SYS_EPOLL_CREATE => Self::epoll_create(args[0] as i32), 787 SYS_EPOLL_CREATE1 => Self::epoll_create1(args[0]), 788 789 SYS_EPOLL_CTL => Self::epoll_ctl( 790 args[0] as i32, 791 args[1], 792 args[2] as i32, 793 VirtAddr::new(args[3]), 794 ), 795 796 #[cfg(target_arch = "x86_64")] 797 SYS_EPOLL_WAIT => Self::epoll_wait( 798 args[0] as i32, 799 VirtAddr::new(args[1]), 800 args[2] as i32, 801 args[3] as i32, 802 ), 803 804 SYS_EPOLL_PWAIT => { 805 let epfd = args[0] as i32; 806 let epoll_event = VirtAddr::new(args[1]); 807 let max_events = args[2] as i32; 808 let timespec = args[3] as i32; 809 let sigmask_addr = args[4] as *mut SigSet; 810 811 if sigmask_addr.is_null() { 812 return Self::epoll_wait(epfd, epoll_event, max_events, timespec); 813 } 814 let sigmask_reader = 815 UserBufferReader::new(sigmask_addr, core::mem::size_of::<SigSet>(), true)?; 816 let mut sigmask = *sigmask_reader.read_one_from_user::<SigSet>(0)?; 817 818 Self::epoll_pwait( 819 args[0] as i32, 820 VirtAddr::new(args[1]), 821 args[2] as i32, 822 args[3] as i32, 823 &mut sigmask, 824 ) 825 } 826 827 // 目前为了适配musl-libc,以下系统调用先这样写着 828 SYS_GETRANDOM => { 829 let flags = GRandFlags::from_bits(args[2] as u8).ok_or(SystemError::EINVAL)?; 830 Self::get_random(args[0] as *mut u8, args[1], flags) 831 } 832 833 SYS_SOCKETPAIR => { 834 let mut user_buffer_writer = UserBufferWriter::new( 835 args[3] as *mut c_int, 836 core::mem::size_of::<[c_int; 2]>(), 837 frame.is_from_user(), 838 )?; 839 let fds = user_buffer_writer.buffer::<i32>(0)?; 840 Self::socketpair(args[0], args[1], args[2], fds) 841 } 842 843 #[cfg(target_arch = "x86_64")] 844 SYS_POLL => { 845 warn!("SYS_POLL has not yet been implemented"); 846 Ok(0) 847 } 848 849 SYS_SETPGID => { 850 warn!("SYS_SETPGID has not yet been implemented"); 851 Ok(0) 852 } 853 854 SYS_RT_SIGPROCMASK => { 855 warn!("SYS_RT_SIGPROCMASK has not yet been implemented"); 856 Ok(0) 857 } 858 859 SYS_TKILL => { 860 warn!("SYS_TKILL has not yet been implemented"); 861 Ok(0) 862 } 863 864 SYS_SIGALTSTACK => { 865 warn!("SYS_SIGALTSTACK has not yet been implemented"); 866 Ok(0) 867 } 868 869 SYS_EXIT_GROUP => { 870 warn!("SYS_EXIT_GROUP has not yet been implemented"); 871 Ok(0) 872 } 873 874 SYS_MADVISE => { 875 let addr = args[0]; 876 let len = page_align_up(args[1]); 877 if addr & (MMArch::PAGE_SIZE - 1) != 0 { 878 Err(SystemError::EINVAL) 879 } else { 880 Self::madvise(VirtAddr::new(addr), len, args[2]) 881 } 882 } 883 884 SYS_GETTID => Self::gettid().map(|tid| tid.into()), 885 886 SYS_SYSLOG => { 887 let syslog_action_type = args[0]; 888 let buf_vaddr = args[1]; 889 let len = args[2]; 890 let from_user = frame.is_from_user(); 891 let mut user_buffer_writer = 892 UserBufferWriter::new(buf_vaddr as *mut u8, len, from_user)?; 893 894 let user_buf = user_buffer_writer.buffer(0)?; 895 Self::do_syslog(syslog_action_type, user_buf, len) 896 } 897 898 SYS_GETUID => Self::getuid(), 899 SYS_GETGID => Self::getgid(), 900 SYS_SETUID => Self::setuid(args[0]), 901 SYS_SETGID => Self::setgid(args[0]), 902 903 SYS_GETEUID => Self::geteuid(), 904 SYS_GETEGID => Self::getegid(), 905 SYS_SETRESUID => Self::seteuid(args[1]), 906 SYS_SETRESGID => Self::setegid(args[1]), 907 908 SYS_SETFSUID => Self::setfsuid(args[0]), 909 SYS_SETFSGID => Self::setfsgid(args[0]), 910 911 SYS_SETSID => { 912 warn!("SYS_SETSID has not yet been implemented"); 913 Ok(0) 914 } 915 916 SYS_GETRUSAGE => { 917 let who = args[0] as c_int; 918 let rusage = args[1] as *mut RUsage; 919 Self::get_rusage(who, rusage) 920 } 921 #[cfg(target_arch = "x86_64")] 922 SYS_READLINK => { 923 let path = args[0] as *const u8; 924 let buf = args[1] as *mut u8; 925 let bufsiz = args[2]; 926 Self::readlink(path, buf, bufsiz) 927 } 928 929 SYS_READLINKAT => { 930 let dirfd = args[0] as i32; 931 let path = args[1] as *const u8; 932 let buf = args[2] as *mut u8; 933 let bufsiz = args[3]; 934 Self::readlink_at(dirfd, path, buf, bufsiz) 935 } 936 937 SYS_PRLIMIT64 => { 938 let pid = args[0]; 939 let pid = Pid::new(pid); 940 let resource = args[1]; 941 let new_limit = args[2] as *const RLimit64; 942 let old_limit = args[3] as *mut RLimit64; 943 944 Self::prlimit64(pid, resource, new_limit, old_limit) 945 } 946 947 #[cfg(target_arch = "x86_64")] 948 SYS_ACCESS => { 949 let pathname = args[0] as *const u8; 950 let mode = args[1] as u32; 951 Self::access(pathname, mode) 952 } 953 954 SYS_FACCESSAT => { 955 let dirfd = args[0] as i32; 956 let pathname = args[1] as *const u8; 957 let mode = args[2] as u32; 958 Self::faccessat2(dirfd, pathname, mode, 0) 959 } 960 961 SYS_FACCESSAT2 => { 962 let dirfd = args[0] as i32; 963 let pathname = args[1] as *const u8; 964 let mode = args[2] as u32; 965 let flags = args[3] as u32; 966 Self::faccessat2(dirfd, pathname, mode, flags) 967 } 968 969 SYS_CLOCK_GETTIME => { 970 let clockid = args[0] as i32; 971 let timespec = args[1] as *mut PosixTimeSpec; 972 Self::clock_gettime(clockid, timespec) 973 } 974 975 SYS_SYSINFO => { 976 let info = args[0] as *mut SysInfo; 977 Self::sysinfo(info) 978 } 979 980 SYS_UMASK => { 981 let mask = args[0] as u32; 982 Self::umask(mask) 983 } 984 985 SYS_FCHOWN => { 986 warn!("SYS_FCHOWN has not yet been implemented"); 987 Ok(0) 988 } 989 990 SYS_FSYNC => { 991 warn!("SYS_FSYNC has not yet been implemented"); 992 Ok(0) 993 } 994 995 SYS_RSEQ => { 996 warn!("SYS_RSEQ has not yet been implemented"); 997 Ok(0) 998 } 999 1000 #[cfg(target_arch = "x86_64")] 1001 SYS_CHMOD => { 1002 let pathname = args[0] as *const u8; 1003 let mode = args[1] as u32; 1004 Self::chmod(pathname, mode) 1005 } 1006 SYS_FCHMOD => { 1007 let fd = args[0] as i32; 1008 let mode = args[1] as u32; 1009 Self::fchmod(fd, mode) 1010 } 1011 SYS_FCHMODAT => { 1012 let dirfd = args[0] as i32; 1013 let pathname = args[1] as *const u8; 1014 let mode = args[2] as u32; 1015 Self::fchmodat(dirfd, pathname, mode) 1016 } 1017 1018 SYS_SCHED_YIELD => Self::do_sched_yield(), 1019 1020 SYS_SCHED_GETAFFINITY => { 1021 let pid = args[0] as i32; 1022 let size = args[1]; 1023 let set_vaddr = args[2]; 1024 1025 let mut user_buffer_writer = 1026 UserBufferWriter::new(set_vaddr as *mut u8, size, frame.is_from_user())?; 1027 let set: &mut [u8] = user_buffer_writer.buffer(0)?; 1028 1029 Self::getaffinity(pid, set) 1030 } 1031 1032 #[cfg(target_arch = "x86_64")] 1033 SYS_GETRLIMIT => { 1034 let resource = args[0]; 1035 let rlimit = args[1] as *mut RLimit64; 1036 1037 Self::prlimit64( 1038 ProcessManager::current_pcb().pid(), 1039 resource, 1040 core::ptr::null::<RLimit64>(), 1041 rlimit, 1042 ) 1043 } 1044 1045 SYS_FADVISE64 => { 1046 // todo: 这个系统调用还没有实现 1047 1048 Err(SystemError::ENOSYS) 1049 } 1050 1051 SYS_MOUNT => { 1052 let source = args[0] as *const u8; 1053 let target = args[1] as *const u8; 1054 let filesystemtype = args[2] as *const u8; 1055 return Self::mount(source, target, filesystemtype, 0, null()); 1056 } 1057 1058 SYS_UMOUNT2 => { 1059 let target = args[0] as *const u8; 1060 let flags = args[1] as i32; 1061 Self::umount2(target, flags)?; 1062 return Ok(0); 1063 } 1064 1065 SYS_NEWFSTATAT => { 1066 // todo: 这个系统调用还没有实现 1067 1068 Err(SystemError::ENOSYS) 1069 } 1070 1071 // SYS_SCHED_YIELD => Self::sched_yield(), 1072 SYS_UNAME => { 1073 let name = args[0] as *mut PosixOldUtsName; 1074 Self::uname(name) 1075 } 1076 SYS_PRCTL => { 1077 // todo: 这个系统调用还没有实现 1078 1079 Err(SystemError::EINVAL) 1080 } 1081 1082 #[cfg(target_arch = "x86_64")] 1083 SYS_ALARM => { 1084 let second = args[0] as u32; 1085 Self::alarm(second) 1086 } 1087 1088 SYS_SHMGET => { 1089 let key = ShmKey::new(args[0]); 1090 let size = args[1]; 1091 let shmflg = ShmFlags::from_bits_truncate(args[2] as u32); 1092 1093 Self::shmget(key, size, shmflg) 1094 } 1095 SYS_SHMAT => { 1096 let id = ShmId::new(args[0]); 1097 let vaddr = VirtAddr::new(args[1]); 1098 let shmflg = ShmFlags::from_bits_truncate(args[2] as u32); 1099 1100 Self::shmat(id, vaddr, shmflg) 1101 } 1102 SYS_SHMDT => { 1103 let vaddr = VirtAddr::new(args[0]); 1104 Self::shmdt(vaddr) 1105 } 1106 SYS_SHMCTL => { 1107 let id = ShmId::new(args[0]); 1108 let cmd = ShmCtlCmd::from(args[1]); 1109 let user_buf = args[2] as *const u8; 1110 let from_user = frame.is_from_user(); 1111 1112 Self::shmctl(id, cmd, user_buf, from_user) 1113 } 1114 SYS_MSYNC => { 1115 let start = page_align_up(args[0]); 1116 let len = page_align_up(args[1]); 1117 let flags = args[2]; 1118 Self::msync(VirtAddr::new(start), len, flags) 1119 } 1120 SYS_UTIMENSAT => Self::sys_utimensat( 1121 args[0] as i32, 1122 args[1] as *const u8, 1123 args[2] as *const PosixTimeSpec, 1124 args[3] as u32, 1125 ), 1126 #[cfg(target_arch = "x86_64")] 1127 SYS_FUTIMESAT => { 1128 let flags = UtimensFlags::empty(); 1129 Self::sys_utimensat( 1130 args[0] as i32, 1131 args[1] as *const u8, 1132 args[2] as *const PosixTimeSpec, 1133 flags.bits(), 1134 ) 1135 } 1136 #[cfg(target_arch = "x86_64")] 1137 SYS_UTIMES => Self::sys_utimes(args[0] as *const u8, args[1] as *const PosixTimeval), 1138 #[cfg(target_arch = "x86_64")] 1139 SYS_EVENTFD => { 1140 let initval = args[0] as u32; 1141 Self::sys_eventfd(initval, 0) 1142 } 1143 SYS_EVENTFD2 => { 1144 let initval = args[0] as u32; 1145 let flags = args[1] as u32; 1146 Self::sys_eventfd(initval, flags) 1147 } 1148 _ => panic!("Unsupported syscall ID: {}", syscall_num), 1149 }; 1150 1151 if ProcessManager::current_pcb() 1152 .flags() 1153 .contains(ProcessFlags::NEED_SCHEDULE) 1154 { 1155 schedule(SchedMode::SM_PREEMPT); 1156 } 1157 1158 return r; 1159 } 1160 1161 pub fn put_string( 1162 s: *const u8, 1163 front_color: u32, 1164 back_color: u32, 1165 ) -> Result<usize, SystemError> { 1166 // todo: 删除这个系统调用 1167 let s = check_and_clone_cstr(s, Some(4096))? 1168 .into_string() 1169 .map_err(|_| SystemError::EINVAL)?; 1170 let fr = (front_color & 0x00ff0000) >> 16; 1171 let fg = (front_color & 0x0000ff00) >> 8; 1172 let fb = front_color & 0x000000ff; 1173 let br = (back_color & 0x00ff0000) >> 16; 1174 let bg = (back_color & 0x0000ff00) >> 8; 1175 let bb = back_color & 0x000000ff; 1176 print!("\x1B[38;2;{fr};{fg};{fb};48;2;{br};{bg};{bb}m{s}\x1B[0m"); 1177 return Ok(s.len()); 1178 } 1179 1180 pub fn reboot() -> Result<usize, SystemError> { 1181 unsafe { cpu_reset() }; 1182 } 1183 } 1184