03744d7c8d
Add a routine similar to copyinuio() and freebsd32_copyinuio() that copies in CloudABI's struct iovecs. These are then translated into FreeBSD format and placed in a 'struct uio', so we can call into the kern_*() functions. Obtained from: https://github.com/NuxiNL/freebsd
146 lines
3.9 KiB
C
146 lines
3.9 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/kernel.h>
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#include <sys/limits.h>
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#include <sys/malloc.h>
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#include <sys/syscallsubr.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <compat/cloudabi64/cloudabi64_syscalldefs.h>
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#include <compat/cloudabi64/cloudabi64_proto.h>
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/* Copies in 64-bit iovec structures from userspace. */
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static int
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cloudabi64_copyinuio(const cloudabi64_iovec_t *iovp, size_t iovcnt,
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struct uio **uiop)
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{
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cloudabi64_iovec_t iovobj;
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struct uio *uio;
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struct iovec *iov;
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size_t i;
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int error;
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/* Allocate uio and iovecs. */
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if (iovcnt > UIO_MAXIOV)
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return (EINVAL);
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uio = malloc(sizeof(struct uio) + iovcnt * sizeof(struct iovec),
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M_IOV, M_WAITOK);
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iov = (struct iovec *)(uio + 1);
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/* Initialize uio. */
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uio->uio_iov = iov;
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uio->uio_iovcnt = iovcnt;
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uio->uio_segflg = UIO_USERSPACE;
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uio->uio_offset = -1;
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uio->uio_resid = 0;
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/* Copy in iovecs. */
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for (i = 0; i < iovcnt; i++) {
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error = copyin(&iovp[i], &iovobj, sizeof(iovobj));
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if (error != 0) {
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free(uio, M_IOV);
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return (error);
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}
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iov[i].iov_base = (void *)iovobj.iov_base;
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iov[i].iov_len = iovobj.iov_len;
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if (iov[i].iov_len > SSIZE_MAX - uio->uio_resid) {
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free(uio, M_IOV);
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return (EINVAL);
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}
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uio->uio_resid += iov[i].iov_len;
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}
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*uiop = uio;
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return (0);
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}
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int
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cloudabi64_sys_fd_pread(struct thread *td,
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struct cloudabi64_sys_fd_pread_args *uap)
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{
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struct uio *uio;
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int error;
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error = cloudabi64_copyinuio(uap->iov, uap->iovcnt, &uio);
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if (error != 0)
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return (error);
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error = kern_preadv(td, uap->fd, uio, uap->offset);
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free(uio, M_IOV);
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return (error);
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}
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int
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cloudabi64_sys_fd_pwrite(struct thread *td,
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struct cloudabi64_sys_fd_pwrite_args *uap)
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{
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struct uio *uio;
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int error;
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error = cloudabi64_copyinuio((const cloudabi64_iovec_t *)uap->iov,
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uap->iovcnt, &uio);
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if (error != 0)
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return (error);
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error = kern_pwritev(td, uap->fd, uio, uap->offset);
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free(uio, M_IOV);
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return (error);
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}
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int
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cloudabi64_sys_fd_read(struct thread *td,
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struct cloudabi64_sys_fd_read_args *uap)
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{
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struct uio *uio;
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int error;
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error = cloudabi64_copyinuio(uap->iov, uap->iovcnt, &uio);
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if (error != 0)
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return (error);
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error = kern_readv(td, uap->fd, uio);
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free(uio, M_IOV);
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return (error);
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}
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int
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cloudabi64_sys_fd_write(struct thread *td,
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struct cloudabi64_sys_fd_write_args *uap)
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{
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struct uio *uio;
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int error;
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error = cloudabi64_copyinuio((const cloudabi64_iovec_t *)uap->iov,
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uap->iovcnt, &uio);
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if (error != 0)
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return (error);
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error = kern_writev(td, uap->fd, uio);
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free(uio, M_IOV);
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return (error);
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}
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