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74781c0888
Extract page-protection definitions from "exec/cpu-all.h" to "exec/page-protection.h". The list of files requiring the new header was generated using: $ git grep -wE \ 'PAGE_(READ|WRITE|EXEC|RWX|VALID|ANON|RESERVED|TARGET_.|PASSTHROUGH)' Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Acked-by: Nicholas Piggin <npiggin@gmail.com> Acked-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240427155714.53669-3-philmd@linaro.org>
454 lines
12 KiB
C
454 lines
12 KiB
C
/*
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* memory management system call shims and definitions
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*
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* Copyright (c) 2013-15 Stacey D. Son
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#ifndef BSD_USER_BSD_MEM_H
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#define BSD_USER_BSD_MEM_H
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/mman.h>
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#include <sys/shm.h>
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#include <fcntl.h>
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#include "qemu-bsd.h"
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#include "exec/page-protection.h"
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extern struct bsd_shm_regions bsd_shm_regions[];
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extern abi_ulong target_brk;
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extern abi_ulong initial_target_brk;
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/* mmap(2) */
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static inline abi_long do_bsd_mmap(void *cpu_env, abi_long arg1, abi_long arg2,
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abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6, abi_long arg7,
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abi_long arg8)
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{
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if (regpairs_aligned(cpu_env) != 0) {
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arg6 = arg7;
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arg7 = arg8;
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}
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return get_errno(target_mmap(arg1, arg2, arg3,
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target_to_host_bitmask(arg4, mmap_flags_tbl),
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arg5, target_arg64(arg6, arg7)));
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}
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/* munmap(2) */
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static inline abi_long do_bsd_munmap(abi_long arg1, abi_long arg2)
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{
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return get_errno(target_munmap(arg1, arg2));
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}
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/* mprotect(2) */
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static inline abi_long do_bsd_mprotect(abi_long arg1, abi_long arg2,
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abi_long arg3)
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{
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return get_errno(target_mprotect(arg1, arg2, arg3));
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}
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/* msync(2) */
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static inline abi_long do_bsd_msync(abi_long addr, abi_long len, abi_long flags)
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{
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if (!guest_range_valid_untagged(addr, len)) {
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/* It seems odd, but POSIX wants this to be ENOMEM */
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return -TARGET_ENOMEM;
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}
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return get_errno(msync(g2h_untagged(addr), len, flags));
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}
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/* mlock(2) */
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static inline abi_long do_bsd_mlock(abi_long arg1, abi_long arg2)
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{
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if (!guest_range_valid_untagged(arg1, arg2)) {
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return -TARGET_EINVAL;
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}
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return get_errno(mlock(g2h_untagged(arg1), arg2));
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}
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/* munlock(2) */
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static inline abi_long do_bsd_munlock(abi_long arg1, abi_long arg2)
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{
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if (!guest_range_valid_untagged(arg1, arg2)) {
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return -TARGET_EINVAL;
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}
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return get_errno(munlock(g2h_untagged(arg1), arg2));
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}
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/* mlockall(2) */
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static inline abi_long do_bsd_mlockall(abi_long arg1)
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{
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return get_errno(mlockall(arg1));
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}
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/* munlockall(2) */
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static inline abi_long do_bsd_munlockall(void)
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{
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return get_errno(munlockall());
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}
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/* madvise(2) */
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static inline abi_long do_bsd_madvise(abi_long arg1, abi_long arg2,
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abi_long arg3)
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{
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abi_ulong len;
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int ret = 0;
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abi_long start = arg1;
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abi_long len_in = arg2;
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abi_long advice = arg3;
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if (start & ~TARGET_PAGE_MASK) {
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return -TARGET_EINVAL;
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}
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if (len_in == 0) {
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return 0;
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}
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len = TARGET_PAGE_ALIGN(len_in);
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if (len == 0 || !guest_range_valid_untagged(start, len)) {
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return -TARGET_EINVAL;
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}
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/*
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* Most advice values are hints, so ignoring and returning success is ok.
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*
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* However, some advice values such as MADV_DONTNEED, are not hints and
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* need to be emulated.
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*
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* A straight passthrough for those may not be safe because qemu sometimes
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* turns private file-backed mappings into anonymous mappings.
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* If all guest pages have PAGE_PASSTHROUGH set, mappings have the
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* same semantics for the host as for the guest.
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*
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* MADV_DONTNEED is passed through, if possible.
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* If passthrough isn't possible, we nevertheless (wrongly!) return
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* success, which is broken but some userspace programs fail to work
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* otherwise. Completely implementing such emulation is quite complicated
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* though.
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*/
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mmap_lock();
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switch (advice) {
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case MADV_DONTNEED:
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if (page_check_range(start, len, PAGE_PASSTHROUGH)) {
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ret = get_errno(madvise(g2h_untagged(start), len, advice));
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if (ret == 0) {
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page_reset_target_data(start, start + len - 1);
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}
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}
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}
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mmap_unlock();
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return ret;
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}
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/* minherit(2) */
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static inline abi_long do_bsd_minherit(abi_long addr, abi_long len,
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abi_long inherit)
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{
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return get_errno(minherit(g2h_untagged(addr), len, inherit));
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}
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/* mincore(2) */
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static inline abi_long do_bsd_mincore(abi_ulong target_addr, abi_ulong len,
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abi_ulong target_vec)
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{
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abi_long ret;
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void *p;
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abi_ulong vec_len = DIV_ROUND_UP(len, TARGET_PAGE_SIZE);
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if (!guest_range_valid_untagged(target_addr, len)
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|| !page_check_range(target_addr, len, PAGE_VALID)) {
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return -TARGET_EFAULT;
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}
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p = lock_user(VERIFY_WRITE, target_vec, vec_len, 0);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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ret = get_errno(mincore(g2h_untagged(target_addr), len, p));
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unlock_user(p, target_vec, vec_len);
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return ret;
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}
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/* do_brk() must return target values and target errnos. */
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static inline abi_long do_obreak(abi_ulong brk_val)
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{
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abi_long mapped_addr;
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abi_ulong new_brk;
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abi_ulong old_brk;
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/* brk pointers are always untagged */
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/* do not allow to shrink below initial brk value */
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if (brk_val < initial_target_brk) {
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return target_brk;
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}
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new_brk = TARGET_PAGE_ALIGN(brk_val);
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old_brk = TARGET_PAGE_ALIGN(target_brk);
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/* new and old target_brk might be on the same page */
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if (new_brk == old_brk) {
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target_brk = brk_val;
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return target_brk;
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}
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/* Release heap if necessary */
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if (new_brk < old_brk) {
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target_munmap(new_brk, old_brk - new_brk);
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target_brk = brk_val;
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return target_brk;
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}
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mapped_addr = target_mmap(old_brk, new_brk - old_brk,
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PROT_READ | PROT_WRITE,
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MAP_FIXED | MAP_EXCL | MAP_ANON | MAP_PRIVATE,
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-1, 0);
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if (mapped_addr == old_brk) {
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target_brk = brk_val;
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return target_brk;
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}
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/* For everything else, return the previous break. */
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return target_brk;
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}
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/* shm_open(2) */
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static inline abi_long do_bsd_shm_open(abi_ulong arg1, abi_long arg2,
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abi_long arg3)
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{
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int ret;
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void *p;
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if (arg1 == (uintptr_t)SHM_ANON) {
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p = SHM_ANON;
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} else {
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p = lock_user_string(arg1);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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}
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ret = get_errno(shm_open(p, target_to_host_bitmask(arg2, fcntl_flags_tbl),
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arg3));
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if (p != SHM_ANON) {
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unlock_user(p, arg1, 0);
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}
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return ret;
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}
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/* shm_unlink(2) */
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static inline abi_long do_bsd_shm_unlink(abi_ulong arg1)
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{
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int ret;
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void *p;
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p = lock_user_string(arg1);
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if (p == NULL) {
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return -TARGET_EFAULT;
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}
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ret = get_errno(shm_unlink(p)); /* XXX path(p)? */
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unlock_user(p, arg1, 0);
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return ret;
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}
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/* shmget(2) */
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static inline abi_long do_bsd_shmget(abi_long arg1, abi_ulong arg2,
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abi_long arg3)
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{
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return get_errno(shmget(arg1, arg2, arg3));
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}
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/* shmctl(2) */
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static inline abi_long do_bsd_shmctl(abi_long shmid, abi_long cmd,
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abi_ulong buff)
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{
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struct shmid_ds dsarg;
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abi_long ret = -TARGET_EINVAL;
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cmd &= 0xff;
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switch (cmd) {
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case IPC_STAT:
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if (target_to_host_shmid_ds(&dsarg, buff)) {
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return -TARGET_EFAULT;
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}
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ret = get_errno(shmctl(shmid, cmd, &dsarg));
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if (host_to_target_shmid_ds(buff, &dsarg)) {
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return -TARGET_EFAULT;
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}
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break;
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case IPC_SET:
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if (target_to_host_shmid_ds(&dsarg, buff)) {
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return -TARGET_EFAULT;
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}
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ret = get_errno(shmctl(shmid, cmd, &dsarg));
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break;
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case IPC_RMID:
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ret = get_errno(shmctl(shmid, cmd, NULL));
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break;
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default:
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ret = -TARGET_EINVAL;
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break;
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}
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return ret;
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}
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/* shmat(2) */
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static inline abi_long do_bsd_shmat(int shmid, abi_ulong shmaddr, int shmflg)
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{
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abi_ulong raddr;
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abi_long ret;
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struct shmid_ds shm_info;
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/* Find out the length of the shared memory segment. */
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ret = get_errno(shmctl(shmid, IPC_STAT, &shm_info));
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if (is_error(ret)) {
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/* Can't get the length */
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return ret;
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}
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if (!guest_range_valid_untagged(shmaddr, shm_info.shm_segsz)) {
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return -TARGET_EINVAL;
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}
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WITH_MMAP_LOCK_GUARD() {
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void *host_raddr;
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if (shmaddr) {
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host_raddr = shmat(shmid, (void *)g2h_untagged(shmaddr), shmflg);
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} else {
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abi_ulong mmap_start;
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mmap_start = mmap_find_vma(0, shm_info.shm_segsz);
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if (mmap_start == -1) {
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return -TARGET_ENOMEM;
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}
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host_raddr = shmat(shmid, g2h_untagged(mmap_start),
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shmflg | SHM_REMAP);
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}
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if (host_raddr == (void *)-1) {
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return get_errno(-1);
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}
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raddr = h2g(host_raddr);
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page_set_flags(raddr, raddr + shm_info.shm_segsz - 1,
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PAGE_VALID | PAGE_RESET | PAGE_READ |
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(shmflg & SHM_RDONLY ? 0 : PAGE_WRITE));
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for (int i = 0; i < N_BSD_SHM_REGIONS; i++) {
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if (bsd_shm_regions[i].start == 0) {
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bsd_shm_regions[i].start = raddr;
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bsd_shm_regions[i].size = shm_info.shm_segsz;
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break;
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}
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}
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}
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return raddr;
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}
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/* shmdt(2) */
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static inline abi_long do_bsd_shmdt(abi_ulong shmaddr)
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{
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abi_long ret;
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WITH_MMAP_LOCK_GUARD() {
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int i;
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for (i = 0; i < N_BSD_SHM_REGIONS; ++i) {
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if (bsd_shm_regions[i].start == shmaddr) {
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break;
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}
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}
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if (i == N_BSD_SHM_REGIONS) {
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return -TARGET_EINVAL;
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}
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ret = get_errno(shmdt(g2h_untagged(shmaddr)));
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if (ret == 0) {
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abi_ulong size = bsd_shm_regions[i].size;
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bsd_shm_regions[i].start = 0;
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page_set_flags(shmaddr, shmaddr + size - 1, 0);
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mmap_reserve(shmaddr, size);
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}
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}
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return ret;
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}
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static inline abi_long do_bsd_vadvise(void)
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{
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/* See sys_ovadvise() in vm_unix.c */
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return -TARGET_EINVAL;
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}
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static inline abi_long do_bsd_sbrk(void)
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{
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/* see sys_sbrk() in vm_mmap.c */
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return -TARGET_EOPNOTSUPP;
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}
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static inline abi_long do_bsd_sstk(void)
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{
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/* see sys_sstk() in vm_mmap.c */
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return -TARGET_EOPNOTSUPP;
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}
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#endif /* BSD_USER_BSD_MEM_H */
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