cea9310d4e
The CloudABI specification has had some minor changes over the last half year. No substantial features have been added, but some features that are deemed unnecessary in retrospect have been removed: - mlock()/munlock(): These calls tend to be used for two different purposes: real-time support and handling of sensitive (cryptographic) material that shouldn't end up in swap. The former use case is out of scope for CloudABI. The latter may also be handled by encrypting swap. Removing this has the advantage that we no longer need to worry about having resource limits put in place. - SOCK_SEQPACKET: Support for SOCK_SEQPACKET is rather inconsistent across various operating systems. Some operating systems supported by CloudABI (e.g., macOS) don't support it at all. Considering that they are rarely used, remove support for the time being. - getsockname(), getpeername(), etc.: A shortcoming of the sockets API is that it doesn't allow you to create socket(pair)s, having fake socket addresses associated with them. This makes it harder to test applications or transparently forward (proxy) connections to them. With CloudABI, we're slowly moving networking connectivity into a separate daemon called Flower. In addition to passing around socket file descriptors, this daemon provides address information in the form of arbitrary string labels. There is thus no longer any need for requesting socket address information from the kernel itself. This change also updates consumers of the generated code accordingly. Even though system calls end up getting renumbered, this won't cause any problems in practice. CloudABI programs always call into the kernel through a kernel-supplied vDSO that has the numbers updated as well. Obtained from: https://github.com/NuxiNL/cloudabi
162 lines
4.3 KiB
C
162 lines
4.3 KiB
C
/*-
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* Copyright (c) 2015 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/proc.h>
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#include <sys/syscallsubr.h>
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#include <contrib/cloudabi/cloudabi_types_common.h>
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#include <compat/cloudabi/cloudabi_proto.h>
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/* Converts CloudABI's memory protection flags to FreeBSD's. */
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static int
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convert_mprot(cloudabi_mprot_t in, int *out)
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{
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/* Unknown protection flags. */
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if ((in & ~(CLOUDABI_PROT_EXEC | CLOUDABI_PROT_WRITE |
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CLOUDABI_PROT_READ)) != 0)
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return (ENOTSUP);
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/* W^X: Write and exec cannot be enabled at the same time. */
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if ((in & (CLOUDABI_PROT_EXEC | CLOUDABI_PROT_WRITE)) ==
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(CLOUDABI_PROT_EXEC | CLOUDABI_PROT_WRITE))
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return (ENOTSUP);
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*out = 0;
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if (in & CLOUDABI_PROT_EXEC)
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*out |= PROT_EXEC;
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if (in & CLOUDABI_PROT_WRITE)
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*out |= PROT_WRITE;
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if (in & CLOUDABI_PROT_READ)
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*out |= PROT_READ;
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return (0);
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}
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int
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cloudabi_sys_mem_advise(struct thread *td,
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struct cloudabi_sys_mem_advise_args *uap)
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{
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int behav;
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switch (uap->advice) {
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case CLOUDABI_ADVICE_DONTNEED:
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behav = MADV_DONTNEED;
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break;
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case CLOUDABI_ADVICE_NORMAL:
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behav = MADV_NORMAL;
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break;
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case CLOUDABI_ADVICE_RANDOM:
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behav = MADV_RANDOM;
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break;
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case CLOUDABI_ADVICE_SEQUENTIAL:
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behav = MADV_SEQUENTIAL;
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break;
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case CLOUDABI_ADVICE_WILLNEED:
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behav = MADV_WILLNEED;
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break;
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default:
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return (EINVAL);
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}
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return (kern_madvise(td, (uintptr_t)uap->mapping, uap->mapping_len,
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behav));
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}
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int
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cloudabi_sys_mem_map(struct thread *td, struct cloudabi_sys_mem_map_args *uap)
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{
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int error, flags, prot;
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/* Translate flags. */
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flags = 0;
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if (uap->flags & CLOUDABI_MAP_ANON)
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flags |= MAP_ANON;
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if (uap->flags & CLOUDABI_MAP_FIXED)
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flags |= MAP_FIXED;
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if (uap->flags & CLOUDABI_MAP_PRIVATE)
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flags |= MAP_PRIVATE;
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if (uap->flags & CLOUDABI_MAP_SHARED)
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flags |= MAP_SHARED;
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/* Translate protection. */
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error = convert_mprot(uap->prot, &prot);
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if (error != 0)
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return (error);
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return (kern_mmap(td, (uintptr_t)uap->addr, uap->len, prot, flags,
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uap->fd, uap->off));
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}
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int
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cloudabi_sys_mem_protect(struct thread *td,
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struct cloudabi_sys_mem_protect_args *uap)
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{
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int error, prot;
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/* Translate protection. */
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error = convert_mprot(uap->prot, &prot);
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if (error != 0)
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return (error);
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return (kern_mprotect(td, (uintptr_t)uap->mapping, uap->mapping_len,
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prot));
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}
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int
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cloudabi_sys_mem_sync(struct thread *td, struct cloudabi_sys_mem_sync_args *uap)
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{
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int flags;
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/* Convert flags. */
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switch (uap->flags & (CLOUDABI_MS_ASYNC | CLOUDABI_MS_SYNC)) {
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case CLOUDABI_MS_ASYNC:
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flags = MS_ASYNC;
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break;
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case CLOUDABI_MS_SYNC:
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flags = MS_SYNC;
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break;
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default:
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return (EINVAL);
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}
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if ((uap->flags & CLOUDABI_MS_INVALIDATE) != 0)
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flags |= MS_INVALIDATE;
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return (kern_msync(td, (uintptr_t)uap->mapping, uap->mapping_len,
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flags));
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}
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int
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cloudabi_sys_mem_unmap(struct thread *td,
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struct cloudabi_sys_mem_unmap_args *uap)
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{
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return (kern_munmap(td, (uintptr_t)uap->mapping, uap->mapping_len));
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}
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