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