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::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.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.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.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.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.from_user() && verify_area(virt_addr, len as usize).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.from_user() 260 && (verify_area(virt_path_ptr, MAX_PATHLEN as usize).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.from_user() 303 && (verify_area(virt_req, core::mem::size_of::<TimeSpec>() as usize).is_err() 304 || verify_area(virt_rem, core::mem::size_of::<TimeSpec>() as usize) 305 .is_err()) 306 { 307 Err(SystemError::EFAULT) 308 } else { 309 Self::nanosleep(req, rem) 310 } 311 } 312 313 SYS_CLOCK => Self::clock(), 314 #[cfg(target_arch = "x86_64")] 315 SYS_PIPE => { 316 let pipefd: *mut i32 = args[0] as *mut c_int; 317 if pipefd.is_null() { 318 Err(SystemError::EFAULT) 319 } else { 320 Self::pipe2(pipefd, FileMode::empty()) 321 } 322 } 323 324 SYS_PIPE2 => { 325 let pipefd: *mut i32 = args[0] as *mut c_int; 326 let arg1 = args[1]; 327 if pipefd.is_null() { 328 Err(SystemError::EFAULT) 329 } else { 330 let flags = FileMode::from_bits_truncate(arg1 as u32); 331 Self::pipe2(pipefd, flags) 332 } 333 } 334 335 SYS_UNLINKAT => { 336 let dirfd = args[0] as i32; 337 let path = args[1] as *const u8; 338 let flags = args[2] as u32; 339 Self::unlinkat(dirfd, path, flags) 340 } 341 342 #[cfg(target_arch = "x86_64")] 343 SYS_RMDIR => { 344 let path = args[0] as *const u8; 345 Self::rmdir(path) 346 } 347 348 #[cfg(target_arch = "x86_64")] 349 SYS_UNLINK => { 350 let path = args[0] as *const u8; 351 Self::unlink(path) 352 } 353 SYS_KILL => { 354 let pid = Pid::new(args[0]); 355 let sig = args[1] as c_int; 356 // kdebug!("KILL SYSCALL RECEIVED"); 357 Self::kill(pid, sig) 358 } 359 360 SYS_RT_SIGACTION => { 361 let sig = args[0] as c_int; 362 let act = args[1]; 363 let old_act = args[2]; 364 Self::sigaction(sig, act, old_act, frame.from_user()) 365 } 366 367 SYS_GETPID => Self::getpid().map(|pid| pid.into()), 368 369 SYS_SCHED => Self::sched(frame.from_user()), 370 SYS_DUP => { 371 let oldfd: i32 = args[0] as c_int; 372 Self::dup(oldfd) 373 } 374 375 #[cfg(target_arch = "x86_64")] 376 SYS_DUP2 => { 377 let oldfd: i32 = args[0] as c_int; 378 let newfd: i32 = args[1] as c_int; 379 Self::dup2(oldfd, newfd) 380 } 381 382 SYS_SOCKET => Self::socket(args[0], args[1], args[2]), 383 SYS_SETSOCKOPT => { 384 let optval = args[3] as *const u8; 385 let optlen = args[4] as usize; 386 let virt_optval = VirtAddr::new(optval as usize); 387 // 验证optval的地址是否合法 388 if verify_area(virt_optval, optlen as usize).is_err() { 389 // 地址空间超出了用户空间的范围，不合法 390 Err(SystemError::EFAULT) 391 } else { 392 let data: &[u8] = unsafe { core::slice::from_raw_parts(optval, optlen) }; 393 Self::setsockopt(args[0], args[1], args[2], data) 394 } 395 } 396 SYS_GETSOCKOPT => { 397 let optval = args[3] as *mut u8; 398 let optlen = args[4] as *mut usize; 399 let virt_optval = VirtAddr::new(optval as usize); 400 let virt_optlen = VirtAddr::new(optlen as usize); 401 let security_check = || { 402 // 验证optval的地址是否合法 403 if verify_area(virt_optval, PAGE_4K_SIZE as usize).is_err() { 404 // 地址空间超出了用户空间的范围，不合法 405 return Err(SystemError::EFAULT); 406 } 407 408 // 验证optlen的地址是否合法 409 if verify_area(virt_optlen, core::mem::size_of::<u32>() as usize).is_err() { 410 // 地址空间超出了用户空间的范围，不合法 411 return Err(SystemError::EFAULT); 412 } 413 return Ok(()); 414 }; 415 let r = security_check(); 416 if r.is_err() { 417 Err(r.unwrap_err()) 418 } else { 419 Self::getsockopt(args[0], args[1], args[2], optval, optlen as *mut u32) 420 } 421 } 422 423 SYS_CONNECT => { 424 let addr = args[1] as *const SockAddr; 425 let addrlen = args[2] as usize; 426 let virt_addr = VirtAddr::new(addr as usize); 427 // 验证addr的地址是否合法 428 if verify_area(virt_addr, addrlen as usize).is_err() { 429 // 地址空间超出了用户空间的范围，不合法 430 Err(SystemError::EFAULT) 431 } else { 432 Self::connect(args[0], addr, addrlen) 433 } 434 } 435 SYS_BIND => { 436 let addr = args[1] as *const SockAddr; 437 let addrlen = args[2] as usize; 438 let virt_addr = VirtAddr::new(addr as usize); 439 // 验证addr的地址是否合法 440 if verify_area(virt_addr, addrlen as usize).is_err() { 441 // 地址空间超出了用户空间的范围，不合法 442 Err(SystemError::EFAULT) 443 } else { 444 Self::bind(args[0], addr, addrlen) 445 } 446 } 447 448 SYS_SENDTO => { 449 let buf = args[1] as *const u8; 450 let len = args[2] as usize; 451 let flags = args[3] as u32; 452 let addr = args[4] as *const SockAddr; 453 let addrlen = args[5] as usize; 454 let virt_buf = VirtAddr::new(buf as usize); 455 let virt_addr = VirtAddr::new(addr as usize); 456 // 验证buf的地址是否合法 457 if verify_area(virt_buf, len as usize).is_err() { 458 // 地址空间超出了用户空间的范围，不合法 459 Err(SystemError::EFAULT) 460 } else if verify_area(virt_addr, addrlen as usize).is_err() { 461 // 地址空间超出了用户空间的范围，不合法 462 Err(SystemError::EFAULT) 463 } else { 464 let data: &[u8] = unsafe { core::slice::from_raw_parts(buf, len) }; 465 Self::sendto(args[0], data, flags, addr, addrlen) 466 } 467 } 468 469 SYS_RECVFROM => { 470 let buf = args[1] as *mut u8; 471 let len = args[2] as usize; 472 let flags = args[3] as u32; 473 let addr = args[4] as *mut SockAddr; 474 let addrlen = args[5] as *mut usize; 475 let virt_buf = VirtAddr::new(buf as usize); 476 let virt_addrlen = VirtAddr::new(addrlen as usize); 477 let virt_addr = VirtAddr::new(addr as usize); 478 let security_check = || { 479 // 验证buf的地址是否合法 480 if verify_area(virt_buf, len).is_err() { 481 // 地址空间超出了用户空间的范围，不合法 482 return Err(SystemError::EFAULT); 483 } 484 485 // 验证addrlen的地址是否合法 486 if verify_area(virt_addrlen, core::mem::size_of::<u32>()).is_err() { 487 // 地址空间超出了用户空间的范围，不合法 488 return Err(SystemError::EFAULT); 489 } 490 491 if verify_area(virt_addr, core::mem::size_of::<SockAddr>()).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 return Ok(()); 496 }; 497 let r = security_check(); 498 if r.is_err() { 499 Err(r.unwrap_err()) 500 } else { 501 let buf = unsafe { core::slice::from_raw_parts_mut(buf, len) }; 502 Self::recvfrom(args[0], buf, flags, addr, addrlen as *mut u32) 503 } 504 } 505 506 SYS_RECVMSG => { 507 let msg = args[1] as *mut MsgHdr; 508 let flags = args[2] as u32; 509 510 let mut user_buffer_writer = 511 UserBufferWriter::new(msg, core::mem::size_of::<MsgHdr>(), frame.from_user())?; 512 let buffer = user_buffer_writer.buffer::<MsgHdr>(0)?; 513 514 let msg = &mut buffer[0]; 515 Self::recvmsg(args[0], msg, flags) 516 } 517 518 SYS_LISTEN => Self::listen(args[0], args[1]), 519 SYS_SHUTDOWN => Self::shutdown(args[0], args[1]), 520 SYS_ACCEPT => Self::accept(args[0], args[1] as *mut SockAddr, args[2] as *mut u32), 521 SYS_ACCEPT4 => Self::accept4( 522 args[0], 523 args[1] as *mut SockAddr, 524 args[2] as *mut u32, 525 args[3] as u32, 526 ), 527 SYS_GETSOCKNAME => { 528 Self::getsockname(args[0], args[1] as *mut SockAddr, args[2] as *mut u32) 529 } 530 SYS_GETPEERNAME => { 531 Self::getpeername(args[0], args[1] as *mut SockAddr, args[2] as *mut u32) 532 } 533 SYS_GETTIMEOFDAY => { 534 let timeval = args[0] as *mut PosixTimeval; 535 let timezone_ptr = args[1] as *mut PosixTimeZone; 536 Self::gettimeofday(timeval, timezone_ptr) 537 } 538 SYS_MMAP => { 539 let len = page_align_up(args[1]); 540 let virt_addr = VirtAddr::new(args[0]); 541 if verify_area(virt_addr, len).is_err() { 542 Err(SystemError::EFAULT) 543 } else { 544 Self::mmap( 545 VirtAddr::new(args[0]), 546 len, 547 args[2], 548 args[3], 549 args[4] as i32, 550 args[5], 551 ) 552 } 553 } 554 SYS_MREMAP => { 555 let old_vaddr = VirtAddr::new(args[0]); 556 let old_len = args[1]; 557 let new_len = args[2]; 558 let mremap_flags = MremapFlags::from_bits_truncate(args[3] as u8); 559 let new_vaddr = VirtAddr::new(args[4]); 560 561 Self::mremap(old_vaddr, old_len, new_len, mremap_flags, new_vaddr) 562 } 563 SYS_MUNMAP => { 564 let addr = args[0]; 565 let len = page_align_up(args[1]); 566 if addr & (MMArch::PAGE_SIZE - 1) != 0 { 567 // The addr argument is not a multiple of the page size 568 Err(SystemError::EINVAL) 569 } else { 570 Self::munmap(VirtAddr::new(addr), len) 571 } 572 } 573 SYS_MPROTECT => { 574 let addr = args[0]; 575 let len = page_align_up(args[1]); 576 if addr & (MMArch::PAGE_SIZE - 1) != 0 { 577 // The addr argument is not a multiple of the page size 578 Err(SystemError::EINVAL) 579 } else { 580 Self::mprotect(VirtAddr::new(addr), len, args[2]) 581 } 582 } 583 584 SYS_GETCWD => { 585 let buf = args[0] as *mut u8; 586 let size = args[1]; 587 let security_check = || { 588 verify_area(VirtAddr::new(buf as usize), size)?; 589 return Ok(()); 590 }; 591 let r = security_check(); 592 if r.is_err() { 593 Err(r.unwrap_err()) 594 } else { 595 let buf = unsafe { core::slice::from_raw_parts_mut(buf, size) }; 596 Self::getcwd(buf).map(|ptr| ptr.data()) 597 } 598 } 599 600 SYS_GETPGID => Self::getpgid(Pid::new(args[0])).map(|pid| pid.into()), 601 602 SYS_GETPPID => Self::getppid().map(|pid| pid.into()), 603 SYS_FSTAT => { 604 let fd = args[0] as i32; 605 let kstat = args[1] as *mut PosixKstat; 606 let vaddr = VirtAddr::new(kstat as usize); 607 // 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 608 // TODO 应该将用了c版本的verify_area都改为rust的verify_area 609 match verify_area(vaddr, core::mem::size_of::<PosixKstat>()) { 610 Ok(_) => Self::fstat(fd, kstat), 611 Err(e) => Err(e), 612 } 613 } 614 615 SYS_FCNTL => { 616 let fd = args[0] as i32; 617 let cmd: Option<FcntlCommand> = 618 <FcntlCommand as FromPrimitive>::from_u32(args[1] as u32); 619 let arg = args[2] as i32; 620 let res = if let Some(cmd) = cmd { 621 Self::fcntl(fd, cmd, arg) 622 } else { 623 Err(SystemError::EINVAL) 624 }; 625 626 // kdebug!("FCNTL: fd: {}, cmd: {:?}, arg: {}, res: {:?}", fd, cmd, arg, res); 627 res 628 } 629 630 SYS_FTRUNCATE => { 631 let fd = args[0] as i32; 632 let len = args[1]; 633 let res = Self::ftruncate(fd, len); 634 // kdebug!("FTRUNCATE: fd: {}, len: {}, res: {:?}", fd, len, res); 635 res 636 } 637 638 #[cfg(target_arch = "x86_64")] 639 SYS_MKNOD => { 640 use crate::driver::base::device::device_number::DeviceNumber; 641 642 let path = args[0]; 643 let flags = args[1]; 644 let dev_t = args[2]; 645 let flags: ModeType = ModeType::from_bits_truncate(flags as u32); 646 Self::mknod(path as *const u8, flags, DeviceNumber::from(dev_t as u32)) 647 } 648 649 SYS_CLONE => { 650 let parent_tid = VirtAddr::new(args[2]); 651 let child_tid = VirtAddr::new(args[3]); 652 653 // 地址校验 654 verify_area(parent_tid, core::mem::size_of::<i32>())?; 655 verify_area(child_tid, core::mem::size_of::<i32>())?; 656 657 let mut clone_args = KernelCloneArgs::new(); 658 clone_args.flags = CloneFlags::from_bits_truncate(args[0] as u64); 659 clone_args.stack = args[1]; 660 clone_args.parent_tid = parent_tid; 661 clone_args.child_tid = child_tid; 662 clone_args.tls = args[4]; 663 Self::clone(frame, clone_args) 664 } 665 666 SYS_FUTEX => { 667 let uaddr = VirtAddr::new(args[0]); 668 let operation = FutexFlag::from_bits(args[1] as u32).ok_or(SystemError::ENOSYS)?; 669 let val = args[2] as u32; 670 let utime = args[3]; 671 let uaddr2 = VirtAddr::new(args[4]); 672 let val3 = args[5] as u32; 673 674 verify_area(uaddr, core::mem::size_of::<u32>())?; 675 verify_area(uaddr2, core::mem::size_of::<u32>())?; 676 677 let mut timespec = None; 678 if utime != 0 && operation.contains(FutexFlag::FLAGS_HAS_TIMEOUT) { 679 let reader = UserBufferReader::new( 680 utime as *const TimeSpec, 681 core::mem::size_of::<TimeSpec>(), 682 true, 683 )?; 684 685 timespec = Some(*reader.read_one_from_user::<TimeSpec>(0)?); 686 } 687 688 Self::do_futex(uaddr, operation, val, timespec, uaddr2, utime as u32, val3) 689 } 690 691 SYS_READV => Self::readv(args[0] as i32, args[1], args[2]), 692 SYS_WRITEV => Self::writev(args[0] as i32, args[1], args[2]), 693 694 SYS_SET_TID_ADDRESS => Self::set_tid_address(args[0]), 695 696 #[cfg(target_arch = "x86_64")] 697 SYS_LSTAT => { 698 let path = args[0] as *const u8; 699 let kstat = args[1] as *mut PosixKstat; 700 Self::lstat(path, kstat) 701 } 702 703 #[cfg(target_arch = "x86_64")] 704 SYS_STAT => { 705 let path = args[0] as *const u8; 706 let kstat = args[1] as *mut PosixKstat; 707 Self::stat(path, kstat) 708 } 709 710 SYS_STATX => { 711 let fd = args[0] as i32; 712 let path = args[1] as *const u8; 713 let flags = args[2] as u32; 714 let mask = args[3] as u32; 715 let kstat = args[4] as *mut PosixStatx; 716 717 Self::do_statx(fd, path, flags, mask, kstat) 718 } 719 720 #[cfg(target_arch = "x86_64")] 721 SYS_EPOLL_CREATE => Self::epoll_create(args[0] as i32), 722 SYS_EPOLL_CREATE1 => Self::epoll_create1(args[0]), 723 724 SYS_EPOLL_CTL => Self::epoll_ctl( 725 args[0] as i32, 726 args[1], 727 args[2] as i32, 728 VirtAddr::new(args[3]), 729 ), 730 731 #[cfg(target_arch = "x86_64")] 732 SYS_EPOLL_WAIT => Self::epoll_wait( 733 args[0] as i32, 734 VirtAddr::new(args[1]), 735 args[2] as i32, 736 args[3] as i32, 737 ), 738 739 SYS_EPOLL_PWAIT => { 740 let epfd = args[0] as i32; 741 let epoll_event = VirtAddr::new(args[1]); 742 let max_events = args[2] as i32; 743 let timespec = args[3] as i32; 744 let sigmask_addr = args[4] as *mut SigSet; 745 746 if sigmask_addr.is_null() { 747 return Self::epoll_wait(epfd, epoll_event, max_events, timespec); 748 } 749 let sigmask_reader = 750 UserBufferReader::new(sigmask_addr, core::mem::size_of::<SigSet>(), true)?; 751 let mut sigmask = *sigmask_reader.read_one_from_user::<SigSet>(0)?; 752 753 Self::epoll_pwait( 754 args[0] as i32, 755 VirtAddr::new(args[1]), 756 args[2] as i32, 757 args[3] as i32, 758 &mut sigmask, 759 ) 760 } 761 762 // 目前为了适配musl-libc,以下系统调用先这样写着 763 SYS_GETRANDOM => { 764 let flags = GRandFlags::from_bits(args[2] as u8).ok_or(SystemError::EINVAL)?; 765 Self::get_random(args[0] as *mut u8, args[1], flags) 766 } 767 768 SYS_SOCKETPAIR => { 769 let mut user_buffer_writer = UserBufferWriter::new( 770 args[3] as *mut c_int, 771 core::mem::size_of::<[c_int; 2]>(), 772 frame.from_user(), 773 )?; 774 let fds = user_buffer_writer.buffer::<i32>(0)?; 775 Self::socketpair(args[0], args[1], args[2], fds) 776 } 777 778 #[cfg(target_arch = "x86_64")] 779 SYS_POLL => { 780 kwarn!("SYS_POLL has not yet been implemented"); 781 Ok(0) 782 } 783 784 SYS_SETPGID => { 785 kwarn!("SYS_SETPGID has not yet been implemented"); 786 Ok(0) 787 } 788 789 SYS_RT_SIGPROCMASK => { 790 kwarn!("SYS_RT_SIGPROCMASK has not yet been implemented"); 791 Ok(0) 792 } 793 794 SYS_TKILL => { 795 kwarn!("SYS_TKILL has not yet been implemented"); 796 Ok(0) 797 } 798 799 SYS_SIGALTSTACK => { 800 kwarn!("SYS_SIGALTSTACK has not yet been implemented"); 801 Ok(0) 802 } 803 804 SYS_EXIT_GROUP => { 805 kwarn!("SYS_EXIT_GROUP has not yet been implemented"); 806 Ok(0) 807 } 808 809 SYS_MADVISE => { 810 // 这个太吵了，总是打印，先注释掉 811 // kwarn!("SYS_MADVISE has not yet been implemented"); 812 Ok(0) 813 } 814 SYS_GETTID => Self::gettid().map(|tid| tid.into()), 815 SYS_GETUID => Self::getuid(), 816 817 SYS_SYSLOG => { 818 let syslog_action_type = args[0]; 819 let buf_vaddr = args[1]; 820 let len = args[2]; 821 let from_user = frame.from_user(); 822 let mut user_buffer_writer = 823 UserBufferWriter::new(buf_vaddr as *mut u8, len, from_user)?; 824 825 let user_buf = user_buffer_writer.buffer(0)?; 826 Self::do_syslog(syslog_action_type, user_buf, len) 827 } 828 829 SYS_GETGID => Self::getgid(), 830 SYS_SETUID => { 831 kwarn!("SYS_SETUID has not yet been implemented"); 832 Ok(0) 833 } 834 SYS_SETGID => { 835 kwarn!("SYS_SETGID has not yet been implemented"); 836 Ok(0) 837 } 838 SYS_GETEUID => Self::geteuid(), 839 SYS_GETEGID => Self::getegid(), 840 SYS_GETRUSAGE => { 841 let who = args[0] as c_int; 842 let rusage = args[1] as *mut RUsage; 843 Self::get_rusage(who, rusage) 844 } 845 846 #[cfg(target_arch = "x86_64")] 847 SYS_READLINK => { 848 let path = args[0] as *const u8; 849 let buf = args[1] as *mut u8; 850 let bufsiz = args[2]; 851 Self::readlink(path, buf, bufsiz) 852 } 853 854 SYS_READLINKAT => { 855 let dirfd = args[0] as i32; 856 let path = args[1] as *const u8; 857 let buf = args[2] as *mut u8; 858 let bufsiz = args[3]; 859 Self::readlink_at(dirfd, path, buf, bufsiz) 860 } 861 862 SYS_PRLIMIT64 => { 863 let pid = args[0]; 864 let pid = Pid::new(pid); 865 let resource = args[1]; 866 let new_limit = args[2] as *const RLimit64; 867 let old_limit = args[3] as *mut RLimit64; 868 869 Self::prlimit64(pid, resource, new_limit, old_limit) 870 } 871 872 #[cfg(target_arch = "x86_64")] 873 SYS_ACCESS => { 874 let pathname = args[0] as *const u8; 875 let mode = args[1] as u32; 876 Self::access(pathname, mode) 877 } 878 879 SYS_FACCESSAT => { 880 let dirfd = args[0] as i32; 881 let pathname = args[1] as *const u8; 882 let mode = args[2] as u32; 883 Self::faccessat2(dirfd, pathname, mode, 0) 884 } 885 886 SYS_FACCESSAT2 => { 887 let dirfd = args[0] as i32; 888 let pathname = args[1] as *const u8; 889 let mode = args[2] as u32; 890 let flags = args[3] as u32; 891 Self::faccessat2(dirfd, pathname, mode, flags) 892 } 893 894 SYS_CLOCK_GETTIME => { 895 let clockid = args[0] as i32; 896 let timespec = args[1] as *mut TimeSpec; 897 Self::clock_gettime(clockid, timespec) 898 } 899 900 SYS_SYSINFO => { 901 let info = args[0] as *mut SysInfo; 902 Self::sysinfo(info) 903 } 904 905 SYS_UMASK => { 906 let mask = args[0] as u32; 907 Self::umask(mask) 908 } 909 910 SYS_FCHOWN => { 911 kwarn!("SYS_FCHOWN has not yet been implemented"); 912 Ok(0) 913 } 914 915 SYS_FSYNC => { 916 kwarn!("SYS_FSYNC has not yet been implemented"); 917 Ok(0) 918 } 919 920 #[cfg(target_arch = "x86_64")] 921 SYS_CHMOD => { 922 let pathname = args[0] as *const u8; 923 let mode = args[1] as u32; 924 Self::chmod(pathname, mode) 925 } 926 SYS_FCHMOD => { 927 let fd = args[0] as i32; 928 let mode = args[1] as u32; 929 Self::fchmod(fd, mode) 930 } 931 SYS_FCHMODAT => { 932 let dirfd = args[0] as i32; 933 let pathname = args[1] as *const u8; 934 let mode = args[2] as u32; 935 Self::fchmodat(dirfd, pathname, mode) 936 } 937 938 SYS_SCHED_GETAFFINITY => { 939 // todo: 这个系统调用还没有实现 940 941 Err(SystemError::ENOSYS) 942 } 943 944 #[cfg(target_arch = "x86_64")] 945 SYS_GETRLIMIT => { 946 let resource = args[0]; 947 let rlimit = args[1] as *mut RLimit64; 948 949 Self::prlimit64( 950 ProcessManager::current_pcb().pid(), 951 resource, 952 core::ptr::null::<RLimit64>(), 953 rlimit, 954 ) 955 } 956 957 SYS_FADVISE64 => { 958 // todo: 这个系统调用还没有实现 959 960 Err(SystemError::ENOSYS) 961 } 962 963 SYS_MOUNT => { 964 let source = args[0] as *const u8; 965 let target = args[1] as *const u8; 966 let filesystemtype = args[2] as *const u8; 967 return Self::mount(source, target, filesystemtype, 0, null()); 968 } 969 SYS_NEWFSTATAT => { 970 // todo: 这个系统调用还没有实现 971 972 Err(SystemError::ENOSYS) 973 } 974 975 SYS_SCHED_YIELD => Self::sched_yield(), 976 SYS_UNAME => { 977 let name = args[0] as *mut PosixOldUtsName; 978 Self::uname(name) 979 } 980 981 _ => panic!("Unsupported syscall ID: {}", syscall_num), 982 }; 983 984 return r; 985 } 986 987 pub fn put_string( 988 s: *const u8, 989 front_color: u32, 990 back_color: u32, 991 ) -> Result<usize, SystemError> { 992 // todo: 删除这个系统调用 993 let s = check_and_clone_cstr(s, Some(4096))?; 994 let fr = (front_color & 0x00ff0000) >> 16; 995 let fg = (front_color & 0x0000ff00) >> 8; 996 let fb = front_color & 0x000000ff; 997 let br = (back_color & 0x00ff0000) >> 16; 998 let bg = (back_color & 0x0000ff00) >> 8; 999 let bb = back_color & 0x000000ff; 1000 print!("\x1B[38;2;{fr};{fg};{fb};48;2;{br};{bg};{bb}m{s}\x1B[0m"); 1001 return Ok(s.len()); 1002 } 1003 1004 pub fn reboot() -> Result<usize, SystemError> { 1005 unsafe { cpu_reset() }; 1006 } 1007 } 1008