Place them in exec.c, exec-all.h and ram_addr.h. This removes knowledge of translate-all.h (which is an internal header) from several files outside accel/tcg and removes knowledge of AddressSpace from translate-all.c (as it only operates on ram_addr_t). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
756 lines
23 KiB
C
756 lines
23 KiB
C
/*
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* mmap support for qemu
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*
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* Copyright (c) 2003 Fabrice Bellard
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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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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "qemu-common.h"
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//#define DEBUG_MMAP
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static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
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static __thread int mmap_lock_count;
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void mmap_lock(void)
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{
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if (mmap_lock_count++ == 0) {
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pthread_mutex_lock(&mmap_mutex);
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}
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}
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void mmap_unlock(void)
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{
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if (--mmap_lock_count == 0) {
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pthread_mutex_unlock(&mmap_mutex);
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}
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}
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bool have_mmap_lock(void)
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{
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return mmap_lock_count > 0 ? true : false;
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}
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/* Grab lock to make sure things are in a consistent state after fork(). */
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void mmap_fork_start(void)
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{
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if (mmap_lock_count)
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abort();
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pthread_mutex_lock(&mmap_mutex);
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}
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void mmap_fork_end(int child)
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{
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if (child)
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pthread_mutex_init(&mmap_mutex, NULL);
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else
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pthread_mutex_unlock(&mmap_mutex);
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}
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/* NOTE: all the constants are the HOST ones, but addresses are target. */
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int target_mprotect(abi_ulong start, abi_ulong len, int prot)
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{
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abi_ulong end, host_start, host_end, addr;
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int prot1, ret;
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#ifdef DEBUG_MMAP
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printf("mprotect: start=0x" TARGET_ABI_FMT_lx
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"len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c\n", start, len,
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prot & PROT_READ ? 'r' : '-',
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prot & PROT_WRITE ? 'w' : '-',
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prot & PROT_EXEC ? 'x' : '-');
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#endif
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if ((start & ~TARGET_PAGE_MASK) != 0)
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return -TARGET_EINVAL;
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len = TARGET_PAGE_ALIGN(len);
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end = start + len;
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if (!guest_range_valid(start, len)) {
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return -TARGET_ENOMEM;
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}
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prot &= PROT_READ | PROT_WRITE | PROT_EXEC;
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if (len == 0)
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return 0;
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mmap_lock();
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host_start = start & qemu_host_page_mask;
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host_end = HOST_PAGE_ALIGN(end);
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if (start > host_start) {
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/* handle host page containing start */
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prot1 = prot;
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for(addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
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prot1 |= page_get_flags(addr);
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}
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if (host_end == host_start + qemu_host_page_size) {
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for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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prot1 |= page_get_flags(addr);
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}
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end = host_end;
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}
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ret = mprotect(g2h(host_start), qemu_host_page_size, prot1 & PAGE_BITS);
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if (ret != 0)
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goto error;
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host_start += qemu_host_page_size;
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}
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if (end < host_end) {
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prot1 = prot;
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for(addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
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prot1 |= page_get_flags(addr);
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}
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ret = mprotect(g2h(host_end - qemu_host_page_size), qemu_host_page_size,
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prot1 & PAGE_BITS);
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if (ret != 0)
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goto error;
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host_end -= qemu_host_page_size;
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}
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/* handle the pages in the middle */
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if (host_start < host_end) {
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ret = mprotect(g2h(host_start), host_end - host_start, prot);
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if (ret != 0)
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goto error;
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}
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page_set_flags(start, start + len, prot | PAGE_VALID);
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mmap_unlock();
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return 0;
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error:
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mmap_unlock();
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return ret;
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}
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/* map an incomplete host page */
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static int mmap_frag(abi_ulong real_start,
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abi_ulong start, abi_ulong end,
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int prot, int flags, int fd, abi_ulong offset)
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{
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abi_ulong real_end, addr;
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void *host_start;
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int prot1, prot_new;
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real_end = real_start + qemu_host_page_size;
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host_start = g2h(real_start);
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/* get the protection of the target pages outside the mapping */
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prot1 = 0;
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for(addr = real_start; addr < real_end; addr++) {
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if (addr < start || addr >= end)
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prot1 |= page_get_flags(addr);
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}
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if (prot1 == 0) {
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/* no page was there, so we allocate one */
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void *p = mmap(host_start, qemu_host_page_size, prot,
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flags | MAP_ANONYMOUS, -1, 0);
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if (p == MAP_FAILED)
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return -1;
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prot1 = prot;
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}
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prot1 &= PAGE_BITS;
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prot_new = prot | prot1;
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if (!(flags & MAP_ANONYMOUS)) {
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/* msync() won't work here, so we return an error if write is
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possible while it is a shared mapping */
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if ((flags & MAP_TYPE) == MAP_SHARED &&
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(prot & PROT_WRITE))
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return -1;
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/* adjust protection to be able to read */
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if (!(prot1 & PROT_WRITE))
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mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
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/* read the corresponding file data */
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if (pread(fd, g2h(start), end - start, offset) == -1)
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return -1;
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/* put final protection */
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if (prot_new != (prot1 | PROT_WRITE))
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mprotect(host_start, qemu_host_page_size, prot_new);
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} else {
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if (prot_new != prot1) {
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mprotect(host_start, qemu_host_page_size, prot_new);
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}
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if (prot_new & PROT_WRITE) {
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memset(g2h(start), 0, end - start);
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}
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}
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return 0;
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}
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#if HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
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# define TASK_UNMAPPED_BASE (1ul << 38)
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#else
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# define TASK_UNMAPPED_BASE 0x40000000
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#endif
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abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
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unsigned long last_brk;
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/* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk
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of guest address space. */
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static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size)
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{
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abi_ulong addr;
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abi_ulong end_addr;
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int prot;
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int looped = 0;
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if (size > reserved_va) {
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return (abi_ulong)-1;
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}
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size = HOST_PAGE_ALIGN(size);
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end_addr = start + size;
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if (end_addr > reserved_va) {
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end_addr = reserved_va;
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}
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addr = end_addr - qemu_host_page_size;
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while (1) {
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if (addr > end_addr) {
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if (looped) {
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return (abi_ulong)-1;
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}
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end_addr = reserved_va;
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addr = end_addr - qemu_host_page_size;
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looped = 1;
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continue;
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}
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prot = page_get_flags(addr);
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if (prot) {
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end_addr = addr;
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}
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if (addr && addr + size == end_addr) {
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break;
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}
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addr -= qemu_host_page_size;
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}
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if (start == mmap_next_start) {
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mmap_next_start = addr;
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}
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return addr;
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}
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/*
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* Find and reserve a free memory area of size 'size'. The search
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* starts at 'start'.
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* It must be called with mmap_lock() held.
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* Return -1 if error.
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*/
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abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size)
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{
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void *ptr, *prev;
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abi_ulong addr;
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int wrapped, repeat;
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/* If 'start' == 0, then a default start address is used. */
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if (start == 0) {
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start = mmap_next_start;
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} else {
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start &= qemu_host_page_mask;
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}
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size = HOST_PAGE_ALIGN(size);
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if (reserved_va) {
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return mmap_find_vma_reserved(start, size);
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}
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addr = start;
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wrapped = repeat = 0;
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prev = 0;
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for (;; prev = ptr) {
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/*
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* Reserve needed memory area to avoid a race.
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* It should be discarded using:
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* - mmap() with MAP_FIXED flag
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* - mremap() with MREMAP_FIXED flag
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* - shmat() with SHM_REMAP flag
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*/
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ptr = mmap(g2h(addr), size, PROT_NONE,
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MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
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/* ENOMEM, if host address space has no memory */
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if (ptr == MAP_FAILED) {
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return (abi_ulong)-1;
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}
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/* Count the number of sequential returns of the same address.
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This is used to modify the search algorithm below. */
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repeat = (ptr == prev ? repeat + 1 : 0);
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if (h2g_valid(ptr + size - 1)) {
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addr = h2g(ptr);
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if ((addr & ~TARGET_PAGE_MASK) == 0) {
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/* Success. */
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if (start == mmap_next_start && addr >= TASK_UNMAPPED_BASE) {
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mmap_next_start = addr + size;
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}
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return addr;
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}
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/* The address is not properly aligned for the target. */
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switch (repeat) {
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case 0:
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/* Assume the result that the kernel gave us is the
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first with enough free space, so start again at the
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next higher target page. */
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addr = TARGET_PAGE_ALIGN(addr);
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break;
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case 1:
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/* Sometimes the kernel decides to perform the allocation
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at the top end of memory instead. */
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addr &= TARGET_PAGE_MASK;
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break;
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case 2:
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/* Start over at low memory. */
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addr = 0;
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break;
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default:
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/* Fail. This unaligned block must the last. */
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addr = -1;
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break;
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}
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} else {
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/* Since the result the kernel gave didn't fit, start
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again at low memory. If any repetition, fail. */
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addr = (repeat ? -1 : 0);
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}
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/* Unmap and try again. */
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munmap(ptr, size);
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/* ENOMEM if we checked the whole of the target address space. */
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if (addr == (abi_ulong)-1) {
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return (abi_ulong)-1;
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} else if (addr == 0) {
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if (wrapped) {
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return (abi_ulong)-1;
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}
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wrapped = 1;
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/* Don't actually use 0 when wrapping, instead indicate
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that we'd truly like an allocation in low memory. */
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addr = (mmap_min_addr > TARGET_PAGE_SIZE
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? TARGET_PAGE_ALIGN(mmap_min_addr)
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: TARGET_PAGE_SIZE);
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} else if (wrapped && addr >= start) {
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return (abi_ulong)-1;
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}
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}
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}
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/* NOTE: all the constants are the HOST ones */
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abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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int flags, int fd, abi_ulong offset)
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{
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abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len;
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mmap_lock();
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#ifdef DEBUG_MMAP
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{
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printf("mmap: start=0x" TARGET_ABI_FMT_lx
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" len=0x" TARGET_ABI_FMT_lx " prot=%c%c%c flags=",
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start, len,
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prot & PROT_READ ? 'r' : '-',
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prot & PROT_WRITE ? 'w' : '-',
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prot & PROT_EXEC ? 'x' : '-');
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if (flags & MAP_FIXED)
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printf("MAP_FIXED ");
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if (flags & MAP_ANONYMOUS)
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printf("MAP_ANON ");
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switch(flags & MAP_TYPE) {
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case MAP_PRIVATE:
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printf("MAP_PRIVATE ");
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break;
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case MAP_SHARED:
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printf("MAP_SHARED ");
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break;
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default:
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printf("[MAP_TYPE=0x%x] ", flags & MAP_TYPE);
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break;
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}
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printf("fd=%d offset=" TARGET_ABI_FMT_lx "\n", fd, offset);
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}
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#endif
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if (offset & ~TARGET_PAGE_MASK) {
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errno = EINVAL;
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goto fail;
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}
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len = TARGET_PAGE_ALIGN(len);
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if (len == 0)
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goto the_end;
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real_start = start & qemu_host_page_mask;
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host_offset = offset & qemu_host_page_mask;
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/* If the user is asking for the kernel to find a location, do that
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before we truncate the length for mapping files below. */
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if (!(flags & MAP_FIXED)) {
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host_len = len + offset - host_offset;
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host_len = HOST_PAGE_ALIGN(host_len);
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start = mmap_find_vma(real_start, host_len);
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if (start == (abi_ulong)-1) {
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errno = ENOMEM;
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goto fail;
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}
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}
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/* When mapping files into a memory area larger than the file, accesses
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to pages beyond the file size will cause a SIGBUS.
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For example, if mmaping a file of 100 bytes on a host with 4K pages
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emulating a target with 8K pages, the target expects to be able to
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access the first 8K. But the host will trap us on any access beyond
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4K.
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When emulating a target with a larger page-size than the hosts, we
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may need to truncate file maps at EOF and add extra anonymous pages
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up to the targets page boundary. */
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if ((qemu_real_host_page_size < qemu_host_page_size) &&
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!(flags & MAP_ANONYMOUS)) {
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struct stat sb;
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if (fstat (fd, &sb) == -1)
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goto fail;
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/* Are we trying to create a map beyond EOF?. */
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if (offset + len > sb.st_size) {
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/* If so, truncate the file map at eof aligned with
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the hosts real pagesize. Additional anonymous maps
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will be created beyond EOF. */
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len = REAL_HOST_PAGE_ALIGN(sb.st_size - offset);
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}
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}
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if (!(flags & MAP_FIXED)) {
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unsigned long host_start;
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void *p;
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host_len = len + offset - host_offset;
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host_len = HOST_PAGE_ALIGN(host_len);
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/* Note: we prefer to control the mapping address. It is
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especially important if qemu_host_page_size >
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qemu_real_host_page_size */
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p = mmap(g2h(start), host_len, prot,
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flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
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if (p == MAP_FAILED)
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goto fail;
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/* update start so that it points to the file position at 'offset' */
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host_start = (unsigned long)p;
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if (!(flags & MAP_ANONYMOUS)) {
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p = mmap(g2h(start), len, prot,
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flags | MAP_FIXED, fd, host_offset);
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if (p == MAP_FAILED) {
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munmap(g2h(start), host_len);
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goto fail;
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}
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host_start += offset - host_offset;
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}
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start = h2g(host_start);
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} else {
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if (start & ~TARGET_PAGE_MASK) {
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errno = EINVAL;
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goto fail;
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}
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end = start + len;
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real_end = HOST_PAGE_ALIGN(end);
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/*
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* Test if requested memory area fits target address space
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|
* It can fail only on 64-bit host with 32-bit target.
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* On any other target/host host mmap() handles this error correctly.
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*/
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if (!guest_range_valid(start, len)) {
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errno = ENOMEM;
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goto fail;
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}
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/* worst case: we cannot map the file because the offset is not
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aligned, so we read it */
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if (!(flags & MAP_ANONYMOUS) &&
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(offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
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/* msync() won't work here, so we return an error if write is
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possible while it is a shared mapping */
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if ((flags & MAP_TYPE) == MAP_SHARED &&
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(prot & PROT_WRITE)) {
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errno = EINVAL;
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goto fail;
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}
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retaddr = target_mmap(start, len, prot | PROT_WRITE,
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MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
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-1, 0);
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if (retaddr == -1)
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goto fail;
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if (pread(fd, g2h(start), len, offset) == -1)
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goto fail;
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if (!(prot & PROT_WRITE)) {
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ret = target_mprotect(start, len, prot);
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assert(ret == 0);
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}
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goto the_end;
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}
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/* handle the start of the mapping */
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|
if (start > real_start) {
|
|
if (real_end == real_start + qemu_host_page_size) {
|
|
/* one single host page */
|
|
ret = mmap_frag(real_start, start, end,
|
|
prot, flags, fd, offset);
|
|
if (ret == -1)
|
|
goto fail;
|
|
goto the_end1;
|
|
}
|
|
ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
|
|
prot, flags, fd, offset);
|
|
if (ret == -1)
|
|
goto fail;
|
|
real_start += qemu_host_page_size;
|
|
}
|
|
/* handle the end of the mapping */
|
|
if (end < real_end) {
|
|
ret = mmap_frag(real_end - qemu_host_page_size,
|
|
real_end - qemu_host_page_size, end,
|
|
prot, flags, fd,
|
|
offset + real_end - qemu_host_page_size - start);
|
|
if (ret == -1)
|
|
goto fail;
|
|
real_end -= qemu_host_page_size;
|
|
}
|
|
|
|
/* map the middle (easier) */
|
|
if (real_start < real_end) {
|
|
void *p;
|
|
unsigned long offset1;
|
|
if (flags & MAP_ANONYMOUS)
|
|
offset1 = 0;
|
|
else
|
|
offset1 = offset + real_start - start;
|
|
p = mmap(g2h(real_start), real_end - real_start,
|
|
prot, flags, fd, offset1);
|
|
if (p == MAP_FAILED)
|
|
goto fail;
|
|
}
|
|
}
|
|
the_end1:
|
|
page_set_flags(start, start + len, prot | PAGE_VALID);
|
|
the_end:
|
|
#ifdef DEBUG_MMAP
|
|
printf("ret=0x" TARGET_ABI_FMT_lx "\n", start);
|
|
page_dump(stdout);
|
|
printf("\n");
|
|
#endif
|
|
tb_invalidate_phys_range(start, start + len);
|
|
mmap_unlock();
|
|
return start;
|
|
fail:
|
|
mmap_unlock();
|
|
return -1;
|
|
}
|
|
|
|
static void mmap_reserve(abi_ulong start, abi_ulong size)
|
|
{
|
|
abi_ulong real_start;
|
|
abi_ulong real_end;
|
|
abi_ulong addr;
|
|
abi_ulong end;
|
|
int prot;
|
|
|
|
real_start = start & qemu_host_page_mask;
|
|
real_end = HOST_PAGE_ALIGN(start + size);
|
|
end = start + size;
|
|
if (start > real_start) {
|
|
/* handle host page containing start */
|
|
prot = 0;
|
|
for (addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
if (real_end == real_start + qemu_host_page_size) {
|
|
for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
end = real_end;
|
|
}
|
|
if (prot != 0)
|
|
real_start += qemu_host_page_size;
|
|
}
|
|
if (end < real_end) {
|
|
prot = 0;
|
|
for (addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
if (prot != 0)
|
|
real_end -= qemu_host_page_size;
|
|
}
|
|
if (real_start != real_end) {
|
|
mmap(g2h(real_start), real_end - real_start, PROT_NONE,
|
|
MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE,
|
|
-1, 0);
|
|
}
|
|
}
|
|
|
|
int target_munmap(abi_ulong start, abi_ulong len)
|
|
{
|
|
abi_ulong end, real_start, real_end, addr;
|
|
int prot, ret;
|
|
|
|
#ifdef DEBUG_MMAP
|
|
printf("munmap: start=0x" TARGET_ABI_FMT_lx " len=0x"
|
|
TARGET_ABI_FMT_lx "\n",
|
|
start, len);
|
|
#endif
|
|
if (start & ~TARGET_PAGE_MASK)
|
|
return -TARGET_EINVAL;
|
|
len = TARGET_PAGE_ALIGN(len);
|
|
if (len == 0 || !guest_range_valid(start, len)) {
|
|
return -TARGET_EINVAL;
|
|
}
|
|
|
|
mmap_lock();
|
|
end = start + len;
|
|
real_start = start & qemu_host_page_mask;
|
|
real_end = HOST_PAGE_ALIGN(end);
|
|
|
|
if (start > real_start) {
|
|
/* handle host page containing start */
|
|
prot = 0;
|
|
for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
if (real_end == real_start + qemu_host_page_size) {
|
|
for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
end = real_end;
|
|
}
|
|
if (prot != 0)
|
|
real_start += qemu_host_page_size;
|
|
}
|
|
if (end < real_end) {
|
|
prot = 0;
|
|
for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
if (prot != 0)
|
|
real_end -= qemu_host_page_size;
|
|
}
|
|
|
|
ret = 0;
|
|
/* unmap what we can */
|
|
if (real_start < real_end) {
|
|
if (reserved_va) {
|
|
mmap_reserve(real_start, real_end - real_start);
|
|
} else {
|
|
ret = munmap(g2h(real_start), real_end - real_start);
|
|
}
|
|
}
|
|
|
|
if (ret == 0) {
|
|
page_set_flags(start, start + len, 0);
|
|
tb_invalidate_phys_range(start, start + len);
|
|
}
|
|
mmap_unlock();
|
|
return ret;
|
|
}
|
|
|
|
abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
|
|
abi_ulong new_size, unsigned long flags,
|
|
abi_ulong new_addr)
|
|
{
|
|
int prot;
|
|
void *host_addr;
|
|
|
|
if (!guest_range_valid(old_addr, old_size) ||
|
|
((flags & MREMAP_FIXED) &&
|
|
!guest_range_valid(new_addr, new_size))) {
|
|
errno = ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
mmap_lock();
|
|
|
|
if (flags & MREMAP_FIXED) {
|
|
host_addr = mremap(g2h(old_addr), old_size, new_size,
|
|
flags, g2h(new_addr));
|
|
|
|
if (reserved_va && host_addr != MAP_FAILED) {
|
|
/* If new and old addresses overlap then the above mremap will
|
|
already have failed with EINVAL. */
|
|
mmap_reserve(old_addr, old_size);
|
|
}
|
|
} else if (flags & MREMAP_MAYMOVE) {
|
|
abi_ulong mmap_start;
|
|
|
|
mmap_start = mmap_find_vma(0, new_size);
|
|
|
|
if (mmap_start == -1) {
|
|
errno = ENOMEM;
|
|
host_addr = MAP_FAILED;
|
|
} else {
|
|
host_addr = mremap(g2h(old_addr), old_size, new_size,
|
|
flags | MREMAP_FIXED, g2h(mmap_start));
|
|
if (reserved_va) {
|
|
mmap_reserve(old_addr, old_size);
|
|
}
|
|
}
|
|
} else {
|
|
int prot = 0;
|
|
if (reserved_va && old_size < new_size) {
|
|
abi_ulong addr;
|
|
for (addr = old_addr + old_size;
|
|
addr < old_addr + new_size;
|
|
addr++) {
|
|
prot |= page_get_flags(addr);
|
|
}
|
|
}
|
|
if (prot == 0) {
|
|
host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
|
|
if (host_addr != MAP_FAILED && reserved_va && old_size > new_size) {
|
|
mmap_reserve(old_addr + old_size, new_size - old_size);
|
|
}
|
|
} else {
|
|
errno = ENOMEM;
|
|
host_addr = MAP_FAILED;
|
|
}
|
|
/* Check if address fits target address space */
|
|
if ((unsigned long)host_addr + new_size > (abi_ulong)-1) {
|
|
/* Revert mremap() changes */
|
|
host_addr = mremap(g2h(old_addr), new_size, old_size, flags);
|
|
errno = ENOMEM;
|
|
host_addr = MAP_FAILED;
|
|
}
|
|
}
|
|
|
|
if (host_addr == MAP_FAILED) {
|
|
new_addr = -1;
|
|
} else {
|
|
new_addr = h2g(host_addr);
|
|
prot = page_get_flags(old_addr);
|
|
page_set_flags(old_addr, old_addr + old_size, 0);
|
|
page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
|
|
}
|
|
tb_invalidate_phys_range(new_addr, new_addr + new_size);
|
|
mmap_unlock();
|
|
return new_addr;
|
|
}
|