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/*
* memory management system call shims and definitions
*
* Copyright (c) 2013-15 Stacey D. Son
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef BSD_USER_BSD_MEM_H
#define BSD_USER_BSD_MEM_H
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <fcntl.h>
#include "qemu-bsd.h"
extern struct bsd_shm_regions bsd_shm_regions[];
extern abi_ulong target_brk;
extern abi_ulong initial_target_brk;
/* mmap(2) */
static inline abi_long do_bsd_mmap(void *cpu_env, abi_long arg1, abi_long arg2,
abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6, abi_long arg7,
abi_long arg8)
{
if (regpairs_aligned(cpu_env) != 0) {
arg6 = arg7;
arg7 = arg8;
}
return get_errno(target_mmap(arg1, arg2, arg3,
target_to_host_bitmask(arg4, mmap_flags_tbl),
arg5, target_arg64(arg6, arg7)));
}
/* munmap(2) */
static inline abi_long do_bsd_munmap(abi_long arg1, abi_long arg2)
{
return get_errno(target_munmap(arg1, arg2));
}
/* mprotect(2) */
static inline abi_long do_bsd_mprotect(abi_long arg1, abi_long arg2,
abi_long arg3)
{
return get_errno(target_mprotect(arg1, arg2, arg3));
}
/* msync(2) */
static inline abi_long do_bsd_msync(abi_long addr, abi_long len, abi_long flags)
{
if (!guest_range_valid_untagged(addr, len)) {
/* It seems odd, but POSIX wants this to be ENOMEM */
return -TARGET_ENOMEM;
}
return get_errno(msync(g2h_untagged(addr), len, flags));
}
/* mlock(2) */
static inline abi_long do_bsd_mlock(abi_long arg1, abi_long arg2)
{
if (!guest_range_valid_untagged(arg1, arg2)) {
return -TARGET_EINVAL;
}
return get_errno(mlock(g2h_untagged(arg1), arg2));
}
/* munlock(2) */
static inline abi_long do_bsd_munlock(abi_long arg1, abi_long arg2)
{
if (!guest_range_valid_untagged(arg1, arg2)) {
return -TARGET_EINVAL;
}
return get_errno(munlock(g2h_untagged(arg1), arg2));
}
/* mlockall(2) */
static inline abi_long do_bsd_mlockall(abi_long arg1)
{
return get_errno(mlockall(arg1));
}
/* munlockall(2) */
static inline abi_long do_bsd_munlockall(void)
{
return get_errno(munlockall());
}
/* madvise(2) */
static inline abi_long do_bsd_madvise(abi_long arg1, abi_long arg2,
abi_long arg3)
{
abi_ulong len;
int ret = 0;
abi_long start = arg1;
abi_long len_in = arg2;
abi_long advice = arg3;
if (start & ~TARGET_PAGE_MASK) {
return -TARGET_EINVAL;
}
if (len_in == 0) {
return 0;
}
len = TARGET_PAGE_ALIGN(len_in);
if (len == 0 || !guest_range_valid_untagged(start, len)) {
return -TARGET_EINVAL;
}
/*
* Most advice values are hints, so ignoring and returning success is ok.
*
* However, some advice values such as MADV_DONTNEED, are not hints and
* need to be emulated.
*
* A straight passthrough for those may not be safe because qemu sometimes
* turns private file-backed mappings into anonymous mappings.
* If all guest pages have PAGE_PASSTHROUGH set, mappings have the
* same semantics for the host as for the guest.
*
* MADV_DONTNEED is passed through, if possible.
* If passthrough isn't possible, we nevertheless (wrongly!) return
* success, which is broken but some userspace programs fail to work
* otherwise. Completely implementing such emulation is quite complicated
* though.
*/
mmap_lock();
switch (advice) {
case MADV_DONTNEED:
if (page_check_range(start, len, PAGE_PASSTHROUGH)) {
ret = get_errno(madvise(g2h_untagged(start), len, advice));
if (ret == 0) {
page_reset_target_data(start, start + len - 1);
}
}
}
mmap_unlock();
return ret;
}
/* minherit(2) */
static inline abi_long do_bsd_minherit(abi_long addr, abi_long len,
abi_long inherit)
{
return get_errno(minherit(g2h_untagged(addr), len, inherit));
}
#endif /* BSD_USER_BSD_MEM_H */
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