| use std::ffi::OsStr; |
| use std::str; |
| |
| use rustc_middle::ty::layout::LayoutOf; |
| use rustc_span::Symbol; |
| use rustc_target::abi::{Align, Size}; |
| use rustc_target::spec::abi::Abi; |
| |
| use crate::shims::alloc::EvalContextExt as _; |
| use crate::shims::unix::*; |
| use crate::*; |
| |
| use shims::unix::freebsd::foreign_items as freebsd; |
| use shims::unix::linux::foreign_items as linux; |
| use shims::unix::macos::foreign_items as macos; |
| use shims::unix::solarish::foreign_items as solarish; |
| |
| pub fn is_dyn_sym(name: &str, target_os: &str) -> bool { |
| match name { |
| // Used for tests. |
| "isatty" => true, |
| // `signal` is set up as a weak symbol in `init_extern_statics` (on Android) so we might as |
| // well allow it in `dlsym`. |
| "signal" => true, |
| // needed at least on macOS to avoid file-based fallback in getrandom |
| "getentropy" | "getrandom" => true, |
| // Give specific OSes a chance to allow their symbols. |
| _ => |
| match target_os { |
| "freebsd" => freebsd::is_dyn_sym(name), |
| "linux" => linux::is_dyn_sym(name), |
| "macos" => macos::is_dyn_sym(name), |
| "solaris" | "illumos" => solarish::is_dyn_sym(name), |
| _ => false, |
| }, |
| } |
| } |
| |
| impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {} |
| pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> { |
| fn emulate_foreign_item_inner( |
| &mut self, |
| link_name: Symbol, |
| abi: Abi, |
| args: &[OpTy<'tcx, Provenance>], |
| dest: &MPlaceTy<'tcx, Provenance>, |
| ) -> InterpResult<'tcx, EmulateItemResult> { |
| let this = self.eval_context_mut(); |
| |
| // See `fn emulate_foreign_item_inner` in `shims/foreign_items.rs` for the general pattern. |
| #[rustfmt::skip] |
| match link_name.as_str() { |
| // Environment variables |
| "getenv" => { |
| let [name] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.getenv(name)?; |
| this.write_pointer(result, dest)?; |
| } |
| "unsetenv" => { |
| let [name] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.unsetenv(name)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "setenv" => { |
| let [name, value, overwrite] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.read_scalar(overwrite)?.to_i32()?; |
| let result = this.setenv(name, value)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "getcwd" => { |
| let [buf, size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.getcwd(buf, size)?; |
| this.write_pointer(result, dest)?; |
| } |
| "chdir" => { |
| let [path] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.chdir(path)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| |
| // File descriptors |
| "read" => { |
| let [fd, buf, count] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let fd = this.read_scalar(fd)?.to_i32()?; |
| let buf = this.read_pointer(buf)?; |
| let count = this.read_target_usize(count)?; |
| let result = this.read(fd, buf, count)?; |
| this.write_scalar(Scalar::from_target_isize(result, this), dest)?; |
| } |
| "write" => { |
| let [fd, buf, n] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let fd = this.read_scalar(fd)?.to_i32()?; |
| let buf = this.read_pointer(buf)?; |
| let count = this.read_target_usize(n)?; |
| trace!("Called write({:?}, {:?}, {:?})", fd, buf, count); |
| let result = this.write(fd, buf, count)?; |
| // Now, `result` is the value we return back to the program. |
| this.write_scalar(Scalar::from_target_isize(result, this), dest)?; |
| } |
| "close" => { |
| let [fd] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.close(fd)?; |
| this.write_scalar(result, dest)?; |
| } |
| "fcntl" => { |
| // `fcntl` is variadic. The argument count is checked based on the first argument |
| // in `this.fcntl()`, so we do not use `check_shim` here. |
| this.check_abi_and_shim_symbol_clash(abi, Abi::C { unwind: false }, link_name)?; |
| let result = this.fcntl(args)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| |
| // File and file system access |
| "open" | "open64" => { |
| // `open` is variadic, the third argument is only present when the second argument has O_CREAT (or on linux O_TMPFILE, but miri doesn't support that) set |
| this.check_abi_and_shim_symbol_clash(abi, Abi::C { unwind: false }, link_name)?; |
| let result = this.open(args)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "unlink" => { |
| let [path] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.unlink(path)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "symlink" => { |
| let [target, linkpath] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.symlink(target, linkpath)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "rename" => { |
| let [oldpath, newpath] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.rename(oldpath, newpath)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "mkdir" => { |
| let [path, mode] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.mkdir(path, mode)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "rmdir" => { |
| let [path] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.rmdir(path)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "opendir" => { |
| let [name] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.opendir(name)?; |
| this.write_scalar(result, dest)?; |
| } |
| "closedir" => { |
| let [dirp] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.closedir(dirp)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "lseek64" => { |
| let [fd, offset, whence] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let fd = this.read_scalar(fd)?.to_i32()?; |
| let offset = this.read_scalar(offset)?.to_i64()?; |
| let whence = this.read_scalar(whence)?.to_i32()?; |
| let result = this.lseek64(fd, offset.into(), whence)?; |
| this.write_scalar(result, dest)?; |
| } |
| "lseek" => { |
| let [fd, offset, whence] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let fd = this.read_scalar(fd)?.to_i32()?; |
| let offset = this.read_scalar(offset)?.to_int(this.libc_ty_layout("off_t").size)?; |
| let whence = this.read_scalar(whence)?.to_i32()?; |
| let result = this.lseek64(fd, offset, whence)?; |
| this.write_scalar(result, dest)?; |
| } |
| "ftruncate64" => { |
| let [fd, length] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let fd = this.read_scalar(fd)?.to_i32()?; |
| let length = this.read_scalar(length)?.to_i64()?; |
| let result = this.ftruncate64(fd, length.into())?; |
| this.write_scalar(result, dest)?; |
| } |
| "ftruncate" => { |
| let [fd, length] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let fd = this.read_scalar(fd)?.to_i32()?; |
| let length = this.read_scalar(length)?.to_int(this.libc_ty_layout("off_t").size)?; |
| let result = this.ftruncate64(fd, length)?; |
| this.write_scalar(result, dest)?; |
| } |
| "fsync" => { |
| let [fd] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.fsync(fd)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "fdatasync" => { |
| let [fd] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.fdatasync(fd)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "readlink" => { |
| let [pathname, buf, bufsize] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.readlink(pathname, buf, bufsize)?; |
| this.write_scalar(Scalar::from_target_isize(result, this), dest)?; |
| } |
| "posix_fadvise" => { |
| let [fd, offset, len, advice] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.read_scalar(fd)?.to_i32()?; |
| this.read_target_isize(offset)?; |
| this.read_target_isize(len)?; |
| this.read_scalar(advice)?.to_i32()?; |
| // fadvise is only informational, we can ignore it. |
| this.write_null(dest)?; |
| } |
| "realpath" => { |
| let [path, resolved_path] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.realpath(path, resolved_path)?; |
| this.write_scalar(result, dest)?; |
| } |
| "mkstemp" => { |
| let [template] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.mkstemp(template)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| |
| // Sockets |
| "socketpair" => { |
| let [domain, type_, protocol, sv] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| |
| let result = this.socketpair(domain, type_, protocol, sv)?; |
| this.write_scalar(result, dest)?; |
| } |
| |
| // Time |
| "gettimeofday" => { |
| let [tv, tz] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.gettimeofday(tv, tz)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "localtime_r" => { |
| let [timep, result_op] = this.check_shim(abi, Abi::C {unwind: false}, link_name, args)?; |
| let result = this.localtime_r(timep, result_op)?; |
| this.write_pointer(result, dest)?; |
| } |
| "clock_gettime" => { |
| let [clk_id, tp] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.clock_gettime(clk_id, tp)?; |
| this.write_scalar(result, dest)?; |
| } |
| |
| // Allocation |
| "posix_memalign" => { |
| let [ret, align, size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let ret = this.deref_pointer(ret)?; |
| let align = this.read_target_usize(align)?; |
| let size = this.read_target_usize(size)?; |
| // Align must be power of 2, and also at least ptr-sized (POSIX rules). |
| // But failure to adhere to this is not UB, it's an error condition. |
| if !align.is_power_of_two() || align < this.pointer_size().bytes() { |
| let einval = this.eval_libc_i32("EINVAL"); |
| this.write_int(einval, dest)?; |
| } else { |
| if size == 0 { |
| this.write_null(&ret)?; |
| } else { |
| let ptr = this.allocate_ptr( |
| Size::from_bytes(size), |
| Align::from_bytes(align).unwrap(), |
| MiriMemoryKind::C.into(), |
| )?; |
| this.write_pointer(ptr, &ret)?; |
| } |
| this.write_null(dest)?; |
| } |
| } |
| |
| "mmap" => { |
| let [addr, length, prot, flags, fd, offset] = this.check_shim(abi, Abi::C {unwind: false}, link_name, args)?; |
| let offset = this.read_scalar(offset)?.to_int(this.libc_ty_layout("off_t").size)?; |
| let ptr = this.mmap(addr, length, prot, flags, fd, offset)?; |
| this.write_scalar(ptr, dest)?; |
| } |
| "munmap" => { |
| let [addr, length] = this.check_shim(abi, Abi::C {unwind: false}, link_name, args)?; |
| let result = this.munmap(addr, length)?; |
| this.write_scalar(result, dest)?; |
| } |
| |
| "reallocarray" => { |
| // Currently this function does not exist on all Unixes, e.g. on macOS. |
| if !matches!(&*this.tcx.sess.target.os, "linux" | "freebsd") { |
| throw_unsup_format!( |
| "`reallocarray` is not supported on {}", |
| this.tcx.sess.target.os |
| ); |
| } |
| let [ptr, nmemb, size] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let ptr = this.read_pointer(ptr)?; |
| let nmemb = this.read_target_usize(nmemb)?; |
| let size = this.read_target_usize(size)?; |
| // reallocarray checks a possible overflow and returns ENOMEM |
| // if that happens. |
| // |
| // Linux: https://www.unix.com/man-page/linux/3/reallocarray/ |
| // FreeBSD: https://man.freebsd.org/cgi/man.cgi?query=reallocarray |
| match nmemb.checked_mul(size) { |
| None => { |
| let einval = this.eval_libc("ENOMEM"); |
| this.set_last_error(einval)?; |
| this.write_null(dest)?; |
| } |
| Some(len) => { |
| let res = this.realloc(ptr, len, MiriMemoryKind::C)?; |
| this.write_pointer(res, dest)?; |
| } |
| } |
| } |
| |
| // Dynamic symbol loading |
| "dlsym" => { |
| let [handle, symbol] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.read_target_usize(handle)?; |
| let symbol = this.read_pointer(symbol)?; |
| let name = this.read_c_str(symbol)?; |
| if let Ok(name) = str::from_utf8(name) && is_dyn_sym(name, &this.tcx.sess.target.os) { |
| let ptr = this.fn_ptr(FnVal::Other(DynSym::from_str(name))); |
| this.write_pointer(ptr, dest)?; |
| } else { |
| this.write_null(dest)?; |
| } |
| } |
| |
| // Querying system information |
| "sysconf" => { |
| let [name] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let name = this.read_scalar(name)?.to_i32()?; |
| // FIXME: Which of these are POSIX, and which are GNU/Linux? |
| // At least the names seem to all also exist on macOS. |
| let sysconfs: &[(&str, fn(&MiriInterpCx<'_, '_>) -> Scalar<Provenance>)] = &[ |
| ("_SC_PAGESIZE", |this| Scalar::from_int(this.machine.page_size, this.pointer_size())), |
| ("_SC_NPROCESSORS_CONF", |this| Scalar::from_int(this.machine.num_cpus, this.pointer_size())), |
| ("_SC_NPROCESSORS_ONLN", |this| Scalar::from_int(this.machine.num_cpus, this.pointer_size())), |
| // 512 seems to be a reasonable default. The value is not critical, in |
| // the sense that getpwuid_r takes and checks the buffer length. |
| ("_SC_GETPW_R_SIZE_MAX", |this| Scalar::from_int(512, this.pointer_size())) |
| ]; |
| let mut result = None; |
| for &(sysconf_name, value) in sysconfs { |
| let sysconf_name = this.eval_libc_i32(sysconf_name); |
| if sysconf_name == name { |
| result = Some(value(this)); |
| break; |
| } |
| } |
| if let Some(result) = result { |
| this.write_scalar(result, dest)?; |
| } else { |
| throw_unsup_format!("unimplemented sysconf name: {}", name) |
| } |
| } |
| |
| // Thread-local storage |
| "pthread_key_create" => { |
| let [key, dtor] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let key_place = this.deref_pointer_as(key, this.libc_ty_layout("pthread_key_t"))?; |
| let dtor = this.read_pointer(dtor)?; |
| |
| // Extract the function type out of the signature (that seems easier than constructing it ourselves). |
| let dtor = if !this.ptr_is_null(dtor)? { |
| Some(this.get_ptr_fn(dtor)?.as_instance()?) |
| } else { |
| None |
| }; |
| |
| // Figure out how large a pthread TLS key actually is. |
| // To this end, deref the argument type. This is `libc::pthread_key_t`. |
| let key_type = key.layout.ty |
| .builtin_deref(true) |
| .ok_or_else(|| err_ub_format!( |
| "wrong signature used for `pthread_key_create`: first argument must be a raw pointer." |
| ))?; |
| let key_layout = this.layout_of(key_type)?; |
| |
| // Create key and write it into the memory where `key_ptr` wants it. |
| let key = this.machine.tls.create_tls_key(dtor, key_layout.size)?; |
| this.write_scalar(Scalar::from_uint(key, key_layout.size), &key_place)?; |
| |
| // Return success (`0`). |
| this.write_null(dest)?; |
| } |
| "pthread_key_delete" => { |
| let [key] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let key = this.read_scalar(key)?.to_bits(key.layout.size)?; |
| this.machine.tls.delete_tls_key(key)?; |
| // Return success (0) |
| this.write_null(dest)?; |
| } |
| "pthread_getspecific" => { |
| let [key] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let key = this.read_scalar(key)?.to_bits(key.layout.size)?; |
| let active_thread = this.get_active_thread(); |
| let ptr = this.machine.tls.load_tls(key, active_thread, this)?; |
| this.write_scalar(ptr, dest)?; |
| } |
| "pthread_setspecific" => { |
| let [key, new_ptr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let key = this.read_scalar(key)?.to_bits(key.layout.size)?; |
| let active_thread = this.get_active_thread(); |
| let new_data = this.read_scalar(new_ptr)?; |
| this.machine.tls.store_tls(key, active_thread, new_data, &*this.tcx)?; |
| |
| // Return success (`0`). |
| this.write_null(dest)?; |
| } |
| |
| // Synchronization primitives |
| "pthread_mutexattr_init" => { |
| let [attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutexattr_init(attr)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutexattr_settype" => { |
| let [attr, kind] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutexattr_settype(attr, kind)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutexattr_destroy" => { |
| let [attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutexattr_destroy(attr)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutex_init" => { |
| let [mutex, attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutex_init(mutex, attr)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutex_lock" => { |
| let [mutex] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutex_lock(mutex)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutex_trylock" => { |
| let [mutex] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutex_trylock(mutex)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutex_unlock" => { |
| let [mutex] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutex_unlock(mutex)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_mutex_destroy" => { |
| let [mutex] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_mutex_destroy(mutex)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_rwlock_rdlock" => { |
| let [rwlock] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_rwlock_rdlock(rwlock)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_rwlock_tryrdlock" => { |
| let [rwlock] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_rwlock_tryrdlock(rwlock)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_rwlock_wrlock" => { |
| let [rwlock] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_rwlock_wrlock(rwlock)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_rwlock_trywrlock" => { |
| let [rwlock] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_rwlock_trywrlock(rwlock)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_rwlock_unlock" => { |
| let [rwlock] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_rwlock_unlock(rwlock)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_rwlock_destroy" => { |
| let [rwlock] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_rwlock_destroy(rwlock)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_condattr_init" => { |
| let [attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_condattr_init(attr)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_condattr_setclock" => { |
| let [attr, clock_id] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_condattr_setclock(attr, clock_id)?; |
| this.write_scalar(result, dest)?; |
| } |
| "pthread_condattr_getclock" => { |
| let [attr, clock_id] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_condattr_getclock(attr, clock_id)?; |
| this.write_scalar(result, dest)?; |
| } |
| "pthread_condattr_destroy" => { |
| let [attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_condattr_destroy(attr)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_cond_init" => { |
| let [cond, attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_cond_init(cond, attr)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_cond_signal" => { |
| let [cond] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_cond_signal(cond)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_cond_broadcast" => { |
| let [cond] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_cond_broadcast(cond)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_cond_wait" => { |
| let [cond, mutex] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_cond_wait(cond, mutex)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_cond_timedwait" => { |
| let [cond, mutex, abstime] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.pthread_cond_timedwait(cond, mutex, abstime, dest)?; |
| } |
| "pthread_cond_destroy" => { |
| let [cond] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_cond_destroy(cond)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| |
| // Threading |
| "pthread_create" => { |
| let [thread, attr, start, arg] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_create(thread, attr, start, arg)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_join" => { |
| let [thread, retval] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_join(thread, retval)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_detach" => { |
| let [thread] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.pthread_detach(thread)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "pthread_self" => { |
| let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let res = this.pthread_self()?; |
| this.write_scalar(res, dest)?; |
| } |
| "sched_yield" => { |
| let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.sched_yield()?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "nanosleep" => { |
| let [req, rem] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.nanosleep(req, rem)?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| |
| // Miscellaneous |
| "isatty" => { |
| let [fd] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let result = this.isatty(fd)?; |
| this.write_scalar(result, dest)?; |
| } |
| "pthread_atfork" => { |
| let [prepare, parent, child] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.read_pointer(prepare)?; |
| this.read_pointer(parent)?; |
| this.read_pointer(child)?; |
| // We do not support forking, so there is nothing to do here. |
| this.write_null(dest)?; |
| } |
| "strerror_r" | "__xpg_strerror_r" => { |
| let [errnum, buf, buflen] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let errnum = this.read_scalar(errnum)?; |
| let buf = this.read_pointer(buf)?; |
| let buflen = this.read_target_usize(buflen)?; |
| |
| let error = this.try_errnum_to_io_error(errnum)?; |
| let formatted = match error { |
| Some(err) => format!("{err}"), |
| None => format!("<unknown errnum in strerror_r: {errnum}>"), |
| }; |
| let (complete, _) = this.write_os_str_to_c_str(OsStr::new(&formatted), buf, buflen)?; |
| let ret = if complete { 0 } else { this.eval_libc_i32("ERANGE") }; |
| this.write_int(ret, dest)?; |
| } |
| "getpid" => { |
| let [] = this.check_shim(abi, Abi::C { unwind: false}, link_name, args)?; |
| let result = this.getpid()?; |
| this.write_scalar(Scalar::from_i32(result), dest)?; |
| } |
| "getentropy" => { |
| // This function is non-standard but exists with the same signature and behavior on |
| // Linux, macOS, FreeBSD and Solaris/Illumos. |
| if !matches!(&*this.tcx.sess.target.os, "linux" | "macos" | "freebsd" | "illumos" | "solaris") { |
| throw_unsup_format!( |
| "`getentropy` is not supported on {}", |
| this.tcx.sess.target.os |
| ); |
| } |
| |
| let [buf, bufsize] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let buf = this.read_pointer(buf)?; |
| let bufsize = this.read_target_usize(bufsize)?; |
| |
| // getentropy sets errno to EIO when the buffer size exceeds 256 bytes. |
| // FreeBSD: https://man.freebsd.org/cgi/man.cgi?query=getentropy&sektion=3&format=html |
| // Linux: https://man7.org/linux/man-pages/man3/getentropy.3.html |
| // macOS: https://keith.github.io/xcode-man-pages/getentropy.2.html |
| // Solaris/Illumos: https://illumos.org/man/3C/getentropy |
| if bufsize > 256 { |
| let err = this.eval_libc("EIO"); |
| this.set_last_error(err)?; |
| this.write_scalar(Scalar::from_i32(-1), dest)?; |
| } else { |
| this.gen_random(buf, bufsize)?; |
| this.write_scalar(Scalar::from_i32(0), dest)?; |
| } |
| } |
| "getrandom" => { |
| // This function is non-standard but exists with the same signature and behavior on |
| // Linux, FreeBSD and Solaris/Illumos. |
| if !matches!(&*this.tcx.sess.target.os, "linux" | "freebsd" | "illumos" | "solaris") { |
| throw_unsup_format!( |
| "`getentropy` is not supported on {}", |
| this.tcx.sess.target.os |
| ); |
| } |
| let [ptr, len, flags] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let ptr = this.read_pointer(ptr)?; |
| let len = this.read_target_usize(len)?; |
| let _flags = this.read_scalar(flags)?.to_i32()?; |
| // We ignore the flags, just always use the same PRNG / host RNG. |
| this.gen_random(ptr, len)?; |
| this.write_scalar(Scalar::from_target_usize(len, this), dest)?; |
| } |
| |
| // Incomplete shims that we "stub out" just to get pre-main initialization code to work. |
| // These shims are enabled only when the caller is in the standard library. |
| "pthread_attr_getguardsize" |
| if this.frame_in_std() => { |
| let [_attr, guard_size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let guard_size = this.deref_pointer(guard_size)?; |
| let guard_size_layout = this.libc_ty_layout("size_t"); |
| this.write_scalar(Scalar::from_uint(this.machine.page_size, guard_size_layout.size), &guard_size)?; |
| |
| // Return success (`0`). |
| this.write_null(dest)?; |
| } |
| |
| | "pthread_attr_init" |
| | "pthread_attr_destroy" |
| if this.frame_in_std() => { |
| let [_] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.write_null(dest)?; |
| } |
| | "pthread_attr_setstacksize" |
| if this.frame_in_std() => { |
| let [_, _] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.write_null(dest)?; |
| } |
| |
| "pthread_attr_getstack" |
| if this.frame_in_std() => { |
| // We don't support "pthread_attr_setstack", so we just pretend all stacks have the same values here. |
| // Hence we can mostly ignore the input `attr_place`. |
| let [attr_place, addr_place, size_place] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| let _attr_place = this.deref_pointer_as(attr_place, this.libc_ty_layout("pthread_attr_t"))?; |
| let addr_place = this.deref_pointer(addr_place)?; |
| let size_place = this.deref_pointer(size_place)?; |
| |
| this.write_scalar( |
| Scalar::from_uint(this.machine.stack_addr, this.pointer_size()), |
| &addr_place, |
| )?; |
| this.write_scalar( |
| Scalar::from_uint(this.machine.stack_size, this.pointer_size()), |
| &size_place, |
| )?; |
| |
| // Return success (`0`). |
| this.write_null(dest)?; |
| } |
| |
| | "signal" |
| | "sigaltstack" |
| if this.frame_in_std() => { |
| let [_, _] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.write_null(dest)?; |
| } |
| | "sigaction" |
| | "mprotect" |
| if this.frame_in_std() => { |
| let [_, _, _] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.write_null(dest)?; |
| } |
| |
| "getuid" |
| if this.frame_in_std() => { |
| let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| // For now, just pretend we always have this fixed UID. |
| this.write_int(super::UID, dest)?; |
| } |
| |
| "getpwuid_r" |
| if this.frame_in_std() => { |
| let [uid, pwd, buf, buflen, result] = |
| this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?; |
| this.check_no_isolation("`getpwuid_r`")?; |
| |
| let uid = this.read_scalar(uid)?.to_u32()?; |
| let pwd = this.deref_pointer_as(pwd, this.libc_ty_layout("passwd"))?; |
| let buf = this.read_pointer(buf)?; |
| let buflen = this.read_target_usize(buflen)?; |
| let result = this.deref_pointer(result)?; |
| |
| // Must be for "us". |
| if uid != crate::shims::unix::UID { |
| throw_unsup_format!("`getpwuid_r` on other users is not supported"); |
| } |
| |
| // Reset all fields to `uninit` to make sure nobody reads them. |
| // (This is a std-only shim so we are okay with such hacks.) |
| this.write_uninit(&pwd)?; |
| |
| // We only set the home_dir field. |
| #[allow(deprecated)] |
| let home_dir = std::env::home_dir().unwrap(); |
| let (written, _) = this.write_path_to_c_str(&home_dir, buf, buflen)?; |
| let pw_dir = this.project_field_named(&pwd, "pw_dir")?; |
| this.write_pointer(buf, &pw_dir)?; |
| |
| if written { |
| this.write_pointer(pwd.ptr(), &result)?; |
| this.write_null(dest)?; |
| } else { |
| this.write_null(&result)?; |
| this.write_scalar(this.eval_libc("ERANGE"), dest)?; |
| } |
| } |
| |
| // Platform-specific shims |
| _ => { |
| let target_os = &*this.tcx.sess.target.os; |
| return match target_os { |
| "freebsd" => freebsd::EvalContextExt::emulate_foreign_item_inner(this, link_name, abi, args, dest), |
| "linux" => linux::EvalContextExt::emulate_foreign_item_inner(this, link_name, abi, args, dest), |
| "macos" => macos::EvalContextExt::emulate_foreign_item_inner(this, link_name, abi, args, dest), |
| "solaris" | "illumos" => solarish::EvalContextExt::emulate_foreign_item_inner(this, link_name, abi, args, dest), |
| _ => Ok(EmulateItemResult::NotSupported), |
| }; |
| } |
| }; |
| |
| Ok(EmulateItemResult::NeedsJumping) |
| } |
| } |
