2003-05-13 02:25:15 +02:00
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/*
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* mmap support for qemu
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2007-09-16 23:08:06 +02:00
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*
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2003-05-13 02:25:15 +02:00
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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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2009-07-16 22:47:01 +02:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2003-05-13 02:25:15 +02:00
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*/
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2016-01-26 19:17:02 +01:00
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#include "qemu/osdep.h"
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2019-12-05 13:25:12 +01:00
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#include "trace.h"
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2019-12-05 13:25:15 +01:00
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#include "exec/log.h"
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2003-05-13 02:25:15 +02:00
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#include "qemu.h"
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2021-09-08 17:44:03 +02:00
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#include "user-internals.h"
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2021-09-08 17:44:01 +02:00
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#include "user-mmap.h"
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2022-09-06 02:08:36 +02:00
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#include "target_mman.h"
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2003-05-13 02:25:15 +02:00
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2009-09-05 12:14:07 +02:00
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static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
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2009-09-23 01:19:03 +02:00
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static __thread int mmap_lock_count;
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2008-06-02 18:16:42 +02:00
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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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2008-06-07 22:50:51 +02:00
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2016-10-27 17:10:00 +02:00
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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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2008-06-07 22:50:51 +02:00
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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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2008-06-02 18:16:42 +02:00
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2020-05-19 20:56:44 +02:00
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/*
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* Validate target prot bitmask.
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* Return the prot bitmask for the host in *HOST_PROT.
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* Return 0 if the target prot bitmask is invalid, otherwise
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* the internal qemu page_flags (which will include PAGE_VALID).
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*/
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static int validate_prot_to_pageflags(int *host_prot, int prot)
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{
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int valid = PROT_READ | PROT_WRITE | PROT_EXEC | TARGET_PROT_SEM;
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int page_flags = (prot & PAGE_BITS) | PAGE_VALID;
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/*
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* For the host, we need not pass anything except read/write/exec.
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* While PROT_SEM is allowed by all hosts, it is also ignored, so
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* don't bother transforming guest bit to host bit. Any other
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* target-specific prot bits will not be understood by the host
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* and will need to be encoded into page_flags for qemu emulation.
|
2020-05-19 20:56:45 +02:00
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*
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* Pages that are executable by the guest will never be executed
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* by the host, but the host will need to be able to read them.
|
2020-05-19 20:56:44 +02:00
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*/
|
2020-05-19 20:56:45 +02:00
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*host_prot = (prot & (PROT_READ | PROT_WRITE))
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| (prot & PROT_EXEC ? PROT_READ : 0);
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2020-05-19 20:56:44 +02:00
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|
2020-10-21 19:37:39 +02:00
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#ifdef TARGET_AARCH64
|
2021-02-12 19:48:55 +01:00
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{
|
2020-10-21 19:37:39 +02:00
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|
ARMCPU *cpu = ARM_CPU(thread_cpu);
|
2021-02-12 19:48:55 +01:00
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|
/*
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|
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|
* The PROT_BTI bit is only accepted if the cpu supports the feature.
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* Since this is the unusual case, don't bother checking unless
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|
* the bit has been requested. If set and valid, record the bit
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* within QEMU's page_flags.
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|
*/
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|
if ((prot & TARGET_PROT_BTI) && cpu_isar_feature(aa64_bti, cpu)) {
|
2020-10-21 19:37:39 +02:00
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|
valid |= TARGET_PROT_BTI;
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|
page_flags |= PAGE_BTI;
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|
|
}
|
2021-02-12 19:48:55 +01:00
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|
/* Similarly for the PROT_MTE bit. */
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|
if ((prot & TARGET_PROT_MTE) && cpu_isar_feature(aa64_mte, cpu)) {
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|
valid |= TARGET_PROT_MTE;
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|
|
page_flags |= PAGE_MTE;
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|
}
|
2020-10-21 19:37:39 +02:00
|
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|
}
|
2022-09-24 13:45:00 +02:00
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|
#elif defined(TARGET_HPPA)
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valid |= PROT_GROWSDOWN | PROT_GROWSUP;
|
2020-10-21 19:37:39 +02:00
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|
#endif
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|
2020-05-19 20:56:44 +02:00
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|
return prot & ~valid ? 0 : page_flags;
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|
|
|
}
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|
2006-03-25 20:31:22 +01:00
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|
/* NOTE: all the constants are the HOST ones, but addresses are target. */
|
2020-05-19 20:56:44 +02:00
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|
int target_mprotect(abi_ulong start, abi_ulong len, int target_prot)
|
2003-05-13 02:25:15 +02:00
|
|
|
{
|
2007-10-14 18:27:31 +02:00
|
|
|
abi_ulong end, host_start, host_end, addr;
|
2020-05-19 20:56:44 +02:00
|
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|
int prot1, ret, page_flags, host_prot;
|
2003-05-13 02:25:15 +02:00
|
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|
|
2020-05-19 20:56:44 +02:00
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|
trace_target_mprotect(start, len, target_prot);
|
2003-05-13 02:25:15 +02:00
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|
2020-05-19 20:56:44 +02:00
|
|
|
if ((start & ~TARGET_PAGE_MASK) != 0) {
|
2018-02-28 23:16:05 +01:00
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|
return -TARGET_EINVAL;
|
2020-05-19 20:56:44 +02:00
|
|
|
}
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|
page_flags = validate_prot_to_pageflags(&host_prot, target_prot);
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|
|
|
if (!page_flags) {
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|
return -TARGET_EINVAL;
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|
}
|
2003-05-13 02:25:15 +02:00
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len = TARGET_PAGE_ALIGN(len);
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end = start + len;
|
2021-02-12 19:48:46 +01:00
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|
if (!guest_range_valid_untagged(start, len)) {
|
2018-02-28 23:16:05 +01:00
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|
return -TARGET_ENOMEM;
|
2018-03-07 22:50:10 +01:00
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|
}
|
2020-05-19 20:56:44 +02:00
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|
if (len == 0) {
|
2003-05-13 02:25:15 +02:00
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|
return 0;
|
2020-05-19 20:56:44 +02:00
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|
}
|
2007-09-17 10:09:54 +02:00
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|
2008-06-02 18:16:42 +02:00
|
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|
mmap_lock();
|
2004-07-05 23:25:26 +02:00
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|
host_start = start & qemu_host_page_mask;
|
2003-05-13 02:25:15 +02:00
|
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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 */
|
2020-05-19 20:56:44 +02:00
|
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|
prot1 = host_prot;
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|
|
for (addr = host_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
2003-05-13 02:25:15 +02:00
|
|
|
prot1 |= page_get_flags(addr);
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|
|
|
}
|
2004-07-05 23:25:26 +02:00
|
|
|
if (host_end == host_start + qemu_host_page_size) {
|
2020-05-19 20:56:44 +02:00
|
|
|
for (addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
|
2003-05-13 02:57:50 +02:00
|
|
|
prot1 |= page_get_flags(addr);
|
|
|
|
}
|
|
|
|
end = host_end;
|
|
|
|
}
|
2021-02-12 19:48:43 +01:00
|
|
|
ret = mprotect(g2h_untagged(host_start), qemu_host_page_size,
|
2020-05-19 20:56:44 +02:00
|
|
|
prot1 & PAGE_BITS);
|
|
|
|
if (ret != 0) {
|
2008-06-02 18:16:42 +02:00
|
|
|
goto error;
|
2020-05-19 20:56:44 +02:00
|
|
|
}
|
2004-07-05 23:25:26 +02:00
|
|
|
host_start += qemu_host_page_size;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
if (end < host_end) {
|
2020-05-19 20:56:44 +02:00
|
|
|
prot1 = host_prot;
|
|
|
|
for (addr = end; addr < host_end; addr += TARGET_PAGE_SIZE) {
|
2003-05-13 02:25:15 +02:00
|
|
|
prot1 |= page_get_flags(addr);
|
|
|
|
}
|
2021-02-12 19:48:43 +01:00
|
|
|
ret = mprotect(g2h_untagged(host_end - qemu_host_page_size),
|
2020-05-19 20:56:44 +02:00
|
|
|
qemu_host_page_size, prot1 & PAGE_BITS);
|
|
|
|
if (ret != 0) {
|
2008-06-02 18:16:42 +02:00
|
|
|
goto error;
|
2020-05-19 20:56:44 +02:00
|
|
|
}
|
2004-07-05 23:25:26 +02:00
|
|
|
host_end -= qemu_host_page_size;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2007-09-17 10:09:54 +02:00
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
/* handle the pages in the middle */
|
|
|
|
if (host_start < host_end) {
|
2021-02-12 19:48:43 +01:00
|
|
|
ret = mprotect(g2h_untagged(host_start),
|
|
|
|
host_end - host_start, host_prot);
|
2020-05-19 20:56:44 +02:00
|
|
|
if (ret != 0) {
|
2008-06-02 18:16:42 +02:00
|
|
|
goto error;
|
2020-05-19 20:56:44 +02:00
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2022-08-17 17:05:03 +02:00
|
|
|
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(start, start + len - 1, page_flags);
|
2022-08-17 17:05:03 +02:00
|
|
|
ret = 0;
|
|
|
|
|
2008-06-02 18:16:42 +02:00
|
|
|
error:
|
|
|
|
mmap_unlock();
|
|
|
|
return ret;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* map an incomplete host page */
|
2007-10-14 18:27:31 +02:00
|
|
|
static int mmap_frag(abi_ulong real_start,
|
|
|
|
abi_ulong start, abi_ulong end,
|
|
|
|
int prot, int flags, int fd, abi_ulong offset)
|
2003-05-13 02:25:15 +02:00
|
|
|
{
|
2007-11-02 20:08:57 +01:00
|
|
|
abi_ulong real_end, addr;
|
2006-03-25 20:31:22 +01:00
|
|
|
void *host_start;
|
2003-05-13 02:25:15 +02:00
|
|
|
int prot1, prot_new;
|
|
|
|
|
2006-03-25 20:31:22 +01:00
|
|
|
real_end = real_start + qemu_host_page_size;
|
2021-02-12 19:48:43 +01:00
|
|
|
host_start = g2h_untagged(real_start);
|
2003-05-13 02:25:15 +02:00
|
|
|
|
|
|
|
/* get the protection of the target pages outside the mapping */
|
|
|
|
prot1 = 0;
|
2006-03-25 20:31:22 +01:00
|
|
|
for(addr = real_start; addr < real_end; addr++) {
|
2003-05-13 02:25:15 +02:00
|
|
|
if (addr < start || addr >= end)
|
|
|
|
prot1 |= page_get_flags(addr);
|
|
|
|
}
|
2007-09-17 10:09:54 +02:00
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
if (prot1 == 0) {
|
|
|
|
/* no page was there, so we allocate one */
|
2007-11-02 20:08:57 +01:00
|
|
|
void *p = mmap(host_start, qemu_host_page_size, prot,
|
|
|
|
flags | MAP_ANONYMOUS, -1, 0);
|
|
|
|
if (p == MAP_FAILED)
|
|
|
|
return -1;
|
2006-03-25 20:31:22 +01:00
|
|
|
prot1 = prot;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
prot1 &= PAGE_BITS;
|
|
|
|
|
|
|
|
prot_new = prot | prot1;
|
|
|
|
if (!(flags & MAP_ANONYMOUS)) {
|
|
|
|
/* msync() won't work here, so we return an error if write is
|
|
|
|
possible while it is a shared mapping */
|
|
|
|
if ((flags & MAP_TYPE) == MAP_SHARED &&
|
|
|
|
(prot & PROT_WRITE))
|
2010-01-20 00:56:24 +01:00
|
|
|
return -1;
|
2003-05-13 02:25:15 +02:00
|
|
|
|
|
|
|
/* adjust protection to be able to read */
|
|
|
|
if (!(prot1 & PROT_WRITE))
|
2006-03-25 20:31:22 +01:00
|
|
|
mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);
|
2007-09-17 10:09:54 +02:00
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
/* read the corresponding file data */
|
2021-02-12 19:48:43 +01:00
|
|
|
if (pread(fd, g2h_untagged(start), end - start, offset) == -1)
|
2010-01-20 00:56:20 +01:00
|
|
|
return -1;
|
2007-09-17 10:09:54 +02:00
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
/* put final protection */
|
|
|
|
if (prot_new != (prot1 | PROT_WRITE))
|
2006-03-25 20:31:22 +01:00
|
|
|
mprotect(host_start, qemu_host_page_size, prot_new);
|
2003-05-13 02:25:15 +02:00
|
|
|
} else {
|
|
|
|
if (prot_new != prot1) {
|
2006-03-25 20:31:22 +01:00
|
|
|
mprotect(host_start, qemu_host_page_size, prot_new);
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2015-12-30 02:10:54 +01:00
|
|
|
if (prot_new & PROT_WRITE) {
|
2021-02-12 19:48:43 +01:00
|
|
|
memset(g2h_untagged(start), 0, end - start);
|
2015-12-30 02:10:54 +01:00
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-03-11 00:39:07 +01:00
|
|
|
#if HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
|
2020-03-13 01:28:13 +01:00
|
|
|
#ifdef TARGET_AARCH64
|
|
|
|
# define TASK_UNMAPPED_BASE 0x5500000000
|
|
|
|
#else
|
2010-03-11 00:39:07 +01:00
|
|
|
# define TASK_UNMAPPED_BASE (1ul << 38)
|
2020-03-13 01:28:13 +01:00
|
|
|
#endif
|
2007-11-14 12:29:07 +01:00
|
|
|
#else
|
2022-09-18 21:45:51 +02:00
|
|
|
#ifdef TARGET_HPPA
|
|
|
|
# define TASK_UNMAPPED_BASE 0xfa000000
|
|
|
|
#else
|
2010-03-11 00:39:07 +01:00
|
|
|
# define TASK_UNMAPPED_BASE 0x40000000
|
2007-11-14 12:29:07 +01:00
|
|
|
#endif
|
2022-09-18 21:45:51 +02:00
|
|
|
#endif
|
2012-03-08 15:40:33 +01:00
|
|
|
abi_ulong mmap_next_start = TASK_UNMAPPED_BASE;
|
2007-11-14 12:29:07 +01:00
|
|
|
|
2008-05-31 18:33:53 +02:00
|
|
|
unsigned long last_brk;
|
|
|
|
|
2010-05-29 03:27:35 +02:00
|
|
|
/* Subroutine of mmap_find_vma, used when we have pre-allocated a chunk
|
|
|
|
of guest address space. */
|
2019-05-19 22:19:52 +02:00
|
|
|
static abi_ulong mmap_find_vma_reserved(abi_ulong start, abi_ulong size,
|
|
|
|
abi_ulong align)
|
2010-05-29 03:27:35 +02:00
|
|
|
{
|
2019-05-19 22:19:52 +02:00
|
|
|
abi_ulong addr, end_addr, incr = qemu_host_page_size;
|
2010-05-29 03:27:35 +02:00
|
|
|
int prot;
|
2019-05-19 22:19:52 +02:00
|
|
|
bool looped = false;
|
2010-05-29 03:27:35 +02:00
|
|
|
|
2015-08-24 14:53:54 +02:00
|
|
|
if (size > reserved_va) {
|
2010-05-29 03:27:35 +02:00
|
|
|
return (abi_ulong)-1;
|
|
|
|
}
|
|
|
|
|
2019-05-19 22:19:52 +02:00
|
|
|
/* Note that start and size have already been aligned by mmap_find_vma. */
|
|
|
|
|
2012-03-08 15:40:33 +01:00
|
|
|
end_addr = start + size;
|
2019-05-19 22:19:52 +02:00
|
|
|
if (start > reserved_va - size) {
|
|
|
|
/* Start at the top of the address space. */
|
2023-03-05 23:26:29 +01:00
|
|
|
end_addr = ((reserved_va + 1 - size) & -align) + size;
|
2019-05-19 22:19:52 +02:00
|
|
|
looped = true;
|
2012-03-08 15:40:33 +01:00
|
|
|
}
|
|
|
|
|
2019-05-19 22:19:52 +02:00
|
|
|
/* Search downward from END_ADDR, checking to see if a page is in use. */
|
|
|
|
addr = end_addr;
|
2012-03-08 15:40:33 +01:00
|
|
|
while (1) {
|
2019-05-19 22:19:52 +02:00
|
|
|
addr -= incr;
|
2012-03-08 15:40:33 +01:00
|
|
|
if (addr > end_addr) {
|
2010-05-29 03:27:35 +02:00
|
|
|
if (looped) {
|
2019-05-19 22:19:52 +02:00
|
|
|
/* Failure. The entire address space has been searched. */
|
2010-05-29 03:27:35 +02:00
|
|
|
return (abi_ulong)-1;
|
|
|
|
}
|
2019-05-19 22:19:52 +02:00
|
|
|
/* Re-start at the top of the address space. */
|
2023-03-05 23:26:29 +01:00
|
|
|
addr = end_addr = ((reserved_va + 1 - size) & -align) + size;
|
2019-05-19 22:19:52 +02:00
|
|
|
looped = true;
|
|
|
|
} else {
|
|
|
|
prot = page_get_flags(addr);
|
|
|
|
if (prot) {
|
|
|
|
/* Page in use. Restart below this page. */
|
|
|
|
addr = end_addr = ((addr - size) & -align) + size;
|
|
|
|
} else if (addr && addr + size == end_addr) {
|
|
|
|
/* Success! All pages between ADDR and END_ADDR are free. */
|
|
|
|
if (start == mmap_next_start) {
|
|
|
|
mmap_next_start = addr;
|
|
|
|
}
|
|
|
|
return addr;
|
|
|
|
}
|
2010-05-29 03:27:35 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-08-13 20:03:58 +02:00
|
|
|
/*
|
|
|
|
* Find and reserve a free memory area of size 'size'. The search
|
|
|
|
* starts at 'start'.
|
|
|
|
* It must be called with mmap_lock() held.
|
|
|
|
* Return -1 if error.
|
|
|
|
*/
|
2019-05-19 22:19:52 +02:00
|
|
|
abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align)
|
2007-11-14 12:29:07 +01:00
|
|
|
{
|
2010-03-11 00:39:07 +01:00
|
|
|
void *ptr, *prev;
|
2009-08-13 20:03:58 +02:00
|
|
|
abi_ulong addr;
|
2010-03-11 00:39:07 +01:00
|
|
|
int wrapped, repeat;
|
2009-08-13 20:03:58 +02:00
|
|
|
|
2019-05-19 22:19:53 +02:00
|
|
|
align = MAX(align, qemu_host_page_size);
|
|
|
|
|
2009-08-13 20:03:58 +02:00
|
|
|
/* If 'start' == 0, then a default start address is used. */
|
2010-03-11 00:39:07 +01:00
|
|
|
if (start == 0) {
|
2009-08-13 20:03:58 +02:00
|
|
|
start = mmap_next_start;
|
2010-03-11 00:39:07 +01:00
|
|
|
} else {
|
|
|
|
start &= qemu_host_page_mask;
|
|
|
|
}
|
2019-05-19 22:19:52 +02:00
|
|
|
start = ROUND_UP(start, align);
|
2010-03-11 00:39:07 +01:00
|
|
|
|
|
|
|
size = HOST_PAGE_ALIGN(size);
|
2009-08-13 20:03:58 +02:00
|
|
|
|
2015-08-24 14:53:54 +02:00
|
|
|
if (reserved_va) {
|
2019-05-19 22:19:52 +02:00
|
|
|
return mmap_find_vma_reserved(start, size, align);
|
2010-05-29 03:27:35 +02:00
|
|
|
}
|
|
|
|
|
2007-11-14 12:29:07 +01:00
|
|
|
addr = start;
|
2010-03-11 00:39:07 +01:00
|
|
|
wrapped = repeat = 0;
|
|
|
|
prev = 0;
|
2009-08-13 20:03:58 +02:00
|
|
|
|
2010-03-11 00:39:07 +01:00
|
|
|
for (;; prev = ptr) {
|
2009-08-13 20:03:58 +02:00
|
|
|
/*
|
|
|
|
* Reserve needed memory area to avoid a race.
|
|
|
|
* It should be discarded using:
|
|
|
|
* - mmap() with MAP_FIXED flag
|
|
|
|
* - mremap() with MREMAP_FIXED flag
|
|
|
|
* - shmat() with SHM_REMAP flag
|
|
|
|
*/
|
2021-02-12 19:48:43 +01:00
|
|
|
ptr = mmap(g2h_untagged(addr), size, PROT_NONE,
|
2009-08-13 20:03:58 +02:00
|
|
|
MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE, -1, 0);
|
|
|
|
|
|
|
|
/* ENOMEM, if host address space has no memory */
|
2010-03-11 00:39:07 +01:00
|
|
|
if (ptr == MAP_FAILED) {
|
2009-08-13 20:03:58 +02:00
|
|
|
return (abi_ulong)-1;
|
2010-03-11 00:39:07 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Count the number of sequential returns of the same address.
|
|
|
|
This is used to modify the search algorithm below. */
|
|
|
|
repeat = (ptr == prev ? repeat + 1 : 0);
|
|
|
|
|
|
|
|
if (h2g_valid(ptr + size - 1)) {
|
|
|
|
addr = h2g(ptr);
|
2009-08-13 20:03:58 +02:00
|
|
|
|
2019-05-19 22:19:52 +02:00
|
|
|
if ((addr & (align - 1)) == 0) {
|
2010-03-11 00:39:07 +01:00
|
|
|
/* Success. */
|
|
|
|
if (start == mmap_next_start && addr >= TASK_UNMAPPED_BASE) {
|
|
|
|
mmap_next_start = addr + size;
|
|
|
|
}
|
|
|
|
return addr;
|
|
|
|
}
|
2009-08-13 20:03:58 +02:00
|
|
|
|
2010-03-11 00:39:07 +01:00
|
|
|
/* The address is not properly aligned for the target. */
|
|
|
|
switch (repeat) {
|
|
|
|
case 0:
|
|
|
|
/* Assume the result that the kernel gave us is the
|
|
|
|
first with enough free space, so start again at the
|
|
|
|
next higher target page. */
|
2019-05-19 22:19:52 +02:00
|
|
|
addr = ROUND_UP(addr, align);
|
2010-03-11 00:39:07 +01:00
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
/* Sometimes the kernel decides to perform the allocation
|
|
|
|
at the top end of memory instead. */
|
2019-05-19 22:19:52 +02:00
|
|
|
addr &= -align;
|
2010-03-11 00:39:07 +01:00
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
/* Start over at low memory. */
|
|
|
|
addr = 0;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
/* Fail. This unaligned block must the last. */
|
|
|
|
addr = -1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* Since the result the kernel gave didn't fit, start
|
|
|
|
again at low memory. If any repetition, fail. */
|
|
|
|
addr = (repeat ? -1 : 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Unmap and try again. */
|
2009-08-13 20:03:58 +02:00
|
|
|
munmap(ptr, size);
|
|
|
|
|
2010-03-11 00:39:07 +01:00
|
|
|
/* ENOMEM if we checked the whole of the target address space. */
|
2010-09-18 07:53:14 +02:00
|
|
|
if (addr == (abi_ulong)-1) {
|
2007-11-14 12:29:07 +01:00
|
|
|
return (abi_ulong)-1;
|
2010-03-11 00:39:07 +01:00
|
|
|
} else if (addr == 0) {
|
|
|
|
if (wrapped) {
|
|
|
|
return (abi_ulong)-1;
|
|
|
|
}
|
|
|
|
wrapped = 1;
|
|
|
|
/* Don't actually use 0 when wrapping, instead indicate
|
2011-04-28 17:20:41 +02:00
|
|
|
that we'd truly like an allocation in low memory. */
|
2010-03-11 00:39:07 +01:00
|
|
|
addr = (mmap_min_addr > TARGET_PAGE_SIZE
|
|
|
|
? TARGET_PAGE_ALIGN(mmap_min_addr)
|
|
|
|
: TARGET_PAGE_SIZE);
|
|
|
|
} else if (wrapped && addr >= start) {
|
|
|
|
return (abi_ulong)-1;
|
|
|
|
}
|
2007-11-14 12:29:07 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
/* NOTE: all the constants are the HOST ones */
|
2020-05-19 20:56:44 +02:00
|
|
|
abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
|
2007-10-14 18:27:31 +02:00
|
|
|
int flags, int fd, abi_ulong offset)
|
2003-05-13 02:25:15 +02:00
|
|
|
{
|
2022-09-06 02:08:38 +02:00
|
|
|
abi_ulong ret, end, real_start, real_end, retaddr, host_offset, host_len,
|
|
|
|
passthrough_start = -1, passthrough_end = -1;
|
2020-05-19 20:56:44 +02:00
|
|
|
int page_flags, host_prot;
|
2003-05-13 02:25:15 +02:00
|
|
|
|
2008-06-02 18:16:42 +02:00
|
|
|
mmap_lock();
|
2020-05-19 20:56:44 +02:00
|
|
|
trace_target_mmap(start, len, target_prot, flags, fd, offset);
|
2003-05-13 02:25:15 +02:00
|
|
|
|
2018-07-30 15:43:20 +02:00
|
|
|
if (!len) {
|
2006-02-04 21:46:24 +01:00
|
|
|
errno = EINVAL;
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2006-02-04 21:46:24 +01:00
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
|
2020-05-19 20:56:44 +02:00
|
|
|
page_flags = validate_prot_to_pageflags(&host_prot, target_prot);
|
|
|
|
if (!page_flags) {
|
|
|
|
errno = EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2018-07-30 15:43:20 +02:00
|
|
|
/* Also check for overflows... */
|
2003-05-13 02:25:15 +02:00
|
|
|
len = TARGET_PAGE_ALIGN(len);
|
2018-07-30 15:43:20 +02:00
|
|
|
if (!len) {
|
|
|
|
errno = ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (offset & ~TARGET_PAGE_MASK) {
|
|
|
|
errno = EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2021-06-12 08:08:28 +02:00
|
|
|
/*
|
|
|
|
* If we're mapping shared memory, ensure we generate code for parallel
|
|
|
|
* execution and flush old translations. This will work up to the level
|
|
|
|
* supported by the host -- anything that requires EXCP_ATOMIC will not
|
|
|
|
* be atomic with respect to an external process.
|
|
|
|
*/
|
|
|
|
if (flags & MAP_SHARED) {
|
|
|
|
CPUState *cpu = thread_cpu;
|
|
|
|
if (!(cpu->tcg_cflags & CF_PARALLEL)) {
|
|
|
|
cpu->tcg_cflags |= CF_PARALLEL;
|
|
|
|
tb_flush(cpu);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-03-25 20:31:22 +01:00
|
|
|
real_start = start & qemu_host_page_mask;
|
2012-06-02 01:07:52 +02:00
|
|
|
host_offset = offset & qemu_host_page_mask;
|
|
|
|
|
|
|
|
/* If the user is asking for the kernel to find a location, do that
|
|
|
|
before we truncate the length for mapping files below. */
|
|
|
|
if (!(flags & MAP_FIXED)) {
|
|
|
|
host_len = len + offset - host_offset;
|
|
|
|
host_len = HOST_PAGE_ALIGN(host_len);
|
2019-05-19 22:19:52 +02:00
|
|
|
start = mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE);
|
2012-06-02 01:07:52 +02:00
|
|
|
if (start == (abi_ulong)-1) {
|
|
|
|
errno = ENOMEM;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
|
2009-02-04 00:06:34 +01:00
|
|
|
/* When mapping files into a memory area larger than the file, accesses
|
|
|
|
to pages beyond the file size will cause a SIGBUS.
|
|
|
|
|
|
|
|
For example, if mmaping a file of 100 bytes on a host with 4K pages
|
|
|
|
emulating a target with 8K pages, the target expects to be able to
|
|
|
|
access the first 8K. But the host will trap us on any access beyond
|
|
|
|
4K.
|
|
|
|
|
|
|
|
When emulating a target with a larger page-size than the hosts, we
|
|
|
|
may need to truncate file maps at EOF and add extra anonymous pages
|
|
|
|
up to the targets page boundary. */
|
|
|
|
|
2022-03-23 16:57:22 +01:00
|
|
|
if ((qemu_real_host_page_size() < qemu_host_page_size) &&
|
2017-01-19 16:15:33 +01:00
|
|
|
!(flags & MAP_ANONYMOUS)) {
|
|
|
|
struct stat sb;
|
2009-02-04 00:06:34 +01:00
|
|
|
|
|
|
|
if (fstat (fd, &sb) == -1)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
/* Are we trying to create a map beyond EOF?. */
|
|
|
|
if (offset + len > sb.st_size) {
|
|
|
|
/* If so, truncate the file map at eof aligned with
|
|
|
|
the hosts real pagesize. Additional anonymous maps
|
|
|
|
will be created beyond EOF. */
|
2015-12-02 13:00:54 +01:00
|
|
|
len = REAL_HOST_PAGE_ALIGN(sb.st_size - offset);
|
2009-02-04 00:06:34 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
if (!(flags & MAP_FIXED)) {
|
2012-06-02 01:07:52 +02:00
|
|
|
unsigned long host_start;
|
2007-11-14 12:29:07 +01:00
|
|
|
void *p;
|
2012-06-02 01:07:52 +02:00
|
|
|
|
2007-11-14 12:29:07 +01:00
|
|
|
host_len = len + offset - host_offset;
|
|
|
|
host_len = HOST_PAGE_ALIGN(host_len);
|
2012-06-02 01:07:52 +02:00
|
|
|
|
2007-11-14 12:29:07 +01:00
|
|
|
/* Note: we prefer to control the mapping address. It is
|
|
|
|
especially important if qemu_host_page_size >
|
|
|
|
qemu_real_host_page_size */
|
2021-02-12 19:48:43 +01:00
|
|
|
p = mmap(g2h_untagged(start), host_len, host_prot,
|
2012-06-02 01:07:52 +02:00
|
|
|
flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
|
2020-05-19 20:56:44 +02:00
|
|
|
if (p == MAP_FAILED) {
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2020-05-19 20:56:44 +02:00
|
|
|
}
|
2007-11-14 12:29:07 +01:00
|
|
|
/* update start so that it points to the file position at 'offset' */
|
|
|
|
host_start = (unsigned long)p;
|
2009-02-04 00:06:34 +01:00
|
|
|
if (!(flags & MAP_ANONYMOUS)) {
|
2021-02-12 19:48:43 +01:00
|
|
|
p = mmap(g2h_untagged(start), len, host_prot,
|
2009-02-04 00:06:34 +01:00
|
|
|
flags | MAP_FIXED, fd, host_offset);
|
2013-06-29 11:41:32 +02:00
|
|
|
if (p == MAP_FAILED) {
|
2021-02-12 19:48:43 +01:00
|
|
|
munmap(g2h_untagged(start), host_len);
|
2013-06-29 11:41:32 +02:00
|
|
|
goto fail;
|
|
|
|
}
|
2007-11-14 12:29:07 +01:00
|
|
|
host_start += offset - host_offset;
|
2009-02-04 00:06:34 +01:00
|
|
|
}
|
2007-11-14 12:29:07 +01:00
|
|
|
start = h2g(host_start);
|
2022-09-06 02:08:38 +02:00
|
|
|
passthrough_start = start;
|
|
|
|
passthrough_end = start + len;
|
2007-11-14 12:29:07 +01:00
|
|
|
} else {
|
|
|
|
if (start & ~TARGET_PAGE_MASK) {
|
2006-02-04 21:46:24 +01:00
|
|
|
errno = EINVAL;
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2006-02-04 21:46:24 +01:00
|
|
|
}
|
2007-11-14 12:29:07 +01:00
|
|
|
end = start + len;
|
|
|
|
real_end = HOST_PAGE_ALIGN(end);
|
2008-04-26 14:17:34 +02:00
|
|
|
|
2018-12-13 23:37:37 +01:00
|
|
|
/*
|
|
|
|
* Test if requested memory area fits target address space
|
|
|
|
* It can fail only on 64-bit host with 32-bit target.
|
|
|
|
* On any other target/host host mmap() handles this error correctly.
|
|
|
|
*/
|
2021-02-12 19:48:46 +01:00
|
|
|
if (end < start || !guest_range_valid_untagged(start, len)) {
|
2018-03-07 22:50:10 +01:00
|
|
|
errno = ENOMEM;
|
2008-12-08 19:12:33 +01:00
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2007-11-14 12:29:07 +01:00
|
|
|
/* worst case: we cannot map the file because the offset is not
|
|
|
|
aligned, so we read it */
|
|
|
|
if (!(flags & MAP_ANONYMOUS) &&
|
|
|
|
(offset & ~qemu_host_page_mask) != (start & ~qemu_host_page_mask)) {
|
|
|
|
/* msync() won't work here, so we return an error if write is
|
|
|
|
possible while it is a shared mapping */
|
|
|
|
if ((flags & MAP_TYPE) == MAP_SHARED &&
|
2020-05-19 20:56:44 +02:00
|
|
|
(host_prot & PROT_WRITE)) {
|
2007-11-14 12:29:07 +01:00
|
|
|
errno = EINVAL;
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2007-11-14 12:29:07 +01:00
|
|
|
}
|
2020-05-19 20:56:44 +02:00
|
|
|
retaddr = target_mmap(start, len, target_prot | PROT_WRITE,
|
2007-11-14 12:29:07 +01:00
|
|
|
MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS,
|
|
|
|
-1, 0);
|
|
|
|
if (retaddr == -1)
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2021-02-12 19:48:43 +01:00
|
|
|
if (pread(fd, g2h_untagged(start), len, offset) == -1)
|
2010-01-20 00:56:20 +01:00
|
|
|
goto fail;
|
2020-05-19 20:56:44 +02:00
|
|
|
if (!(host_prot & PROT_WRITE)) {
|
|
|
|
ret = target_mprotect(start, len, target_prot);
|
2015-09-14 12:31:44 +02:00
|
|
|
assert(ret == 0);
|
2007-11-14 12:29:07 +01:00
|
|
|
}
|
|
|
|
goto the_end;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2007-11-14 12:29:07 +01:00
|
|
|
|
|
|
|
/* handle the start of the mapping */
|
|
|
|
if (start > real_start) {
|
|
|
|
if (real_end == real_start + qemu_host_page_size) {
|
|
|
|
/* one single host page */
|
|
|
|
ret = mmap_frag(real_start, start, end,
|
2020-05-19 20:56:44 +02:00
|
|
|
host_prot, flags, fd, offset);
|
2007-11-14 12:29:07 +01:00
|
|
|
if (ret == -1)
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2007-11-14 12:29:07 +01:00
|
|
|
goto the_end1;
|
|
|
|
}
|
|
|
|
ret = mmap_frag(real_start, start, real_start + qemu_host_page_size,
|
2020-05-19 20:56:44 +02:00
|
|
|
host_prot, flags, fd, offset);
|
2003-05-13 02:25:15 +02:00
|
|
|
if (ret == -1)
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2007-11-14 12:29:07 +01:00
|
|
|
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,
|
2015-12-24 02:07:33 +01:00
|
|
|
real_end - qemu_host_page_size, end,
|
2020-05-19 20:56:44 +02:00
|
|
|
host_prot, flags, fd,
|
2007-11-14 12:29:07 +01:00
|
|
|
offset + real_end - qemu_host_page_size - start);
|
|
|
|
if (ret == -1)
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2007-11-14 12:29:07 +01:00
|
|
|
real_end -= qemu_host_page_size;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2007-09-17 10:09:54 +02:00
|
|
|
|
2007-11-14 12:29:07 +01:00
|
|
|
/* 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;
|
2021-02-12 19:48:43 +01:00
|
|
|
p = mmap(g2h_untagged(real_start), real_end - real_start,
|
2020-05-19 20:56:44 +02:00
|
|
|
host_prot, flags, fd, offset1);
|
2007-11-14 12:29:07 +01:00
|
|
|
if (p == MAP_FAILED)
|
2008-06-02 18:16:42 +02:00
|
|
|
goto fail;
|
2022-09-06 02:08:38 +02:00
|
|
|
passthrough_start = real_start;
|
|
|
|
passthrough_end = real_end;
|
2007-11-14 12:29:07 +01:00
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
the_end1:
|
2021-02-12 19:48:33 +01:00
|
|
|
if (flags & MAP_ANONYMOUS) {
|
|
|
|
page_flags |= PAGE_ANON;
|
|
|
|
}
|
2021-02-12 19:48:32 +01:00
|
|
|
page_flags |= PAGE_RESET;
|
2022-09-06 02:08:38 +02:00
|
|
|
if (passthrough_start == passthrough_end) {
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(start, start + len - 1, page_flags);
|
2022-09-06 02:08:38 +02:00
|
|
|
} else {
|
|
|
|
if (start < passthrough_start) {
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(start, passthrough_start - 1, page_flags);
|
2022-09-06 02:08:38 +02:00
|
|
|
}
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(passthrough_start, passthrough_end - 1,
|
2022-09-06 02:08:38 +02:00
|
|
|
page_flags | PAGE_PASSTHROUGH);
|
|
|
|
if (passthrough_end < start + len) {
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(passthrough_end, start + len - 1, page_flags);
|
2022-09-06 02:08:38 +02:00
|
|
|
}
|
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
the_end:
|
2019-12-05 13:25:14 +01:00
|
|
|
trace_target_mmap_complete(start);
|
2019-12-05 13:25:15 +01:00
|
|
|
if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
|
2022-04-17 20:30:02 +02:00
|
|
|
FILE *f = qemu_log_trylock();
|
|
|
|
if (f) {
|
|
|
|
fprintf(f, "page layout changed following mmap\n");
|
|
|
|
page_dump(f);
|
|
|
|
qemu_log_unlock(f);
|
|
|
|
}
|
2019-12-05 13:25:15 +01:00
|
|
|
}
|
2008-06-02 18:16:42 +02:00
|
|
|
mmap_unlock();
|
2003-05-13 02:25:15 +02:00
|
|
|
return start;
|
2008-06-02 18:16:42 +02:00
|
|
|
fail:
|
|
|
|
mmap_unlock();
|
|
|
|
return -1;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
|
2010-05-29 03:27:35 +02:00
|
|
|
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) {
|
2021-02-12 19:48:43 +01:00
|
|
|
mmap(g2h_untagged(real_start), real_end - real_start, PROT_NONE,
|
2010-05-29 03:27:35 +02:00
|
|
|
MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE | MAP_NORESERVE,
|
|
|
|
-1, 0);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-10-14 18:27:31 +02:00
|
|
|
int target_munmap(abi_ulong start, abi_ulong len)
|
2003-05-13 02:25:15 +02:00
|
|
|
{
|
2007-10-14 18:27:31 +02:00
|
|
|
abi_ulong end, real_start, real_end, addr;
|
2003-05-13 02:25:15 +02:00
|
|
|
int prot, ret;
|
|
|
|
|
2019-12-05 13:25:16 +01:00
|
|
|
trace_target_munmap(start, len);
|
|
|
|
|
2003-05-13 02:25:15 +02:00
|
|
|
if (start & ~TARGET_PAGE_MASK)
|
2018-02-28 23:16:05 +01:00
|
|
|
return -TARGET_EINVAL;
|
2003-05-13 02:25:15 +02:00
|
|
|
len = TARGET_PAGE_ALIGN(len);
|
2021-02-12 19:48:46 +01:00
|
|
|
if (len == 0 || !guest_range_valid_untagged(start, len)) {
|
2018-02-28 23:16:05 +01:00
|
|
|
return -TARGET_EINVAL;
|
2018-03-07 22:50:10 +01:00
|
|
|
}
|
|
|
|
|
2008-06-02 18:16:42 +02:00
|
|
|
mmap_lock();
|
2003-05-13 02:25:15 +02:00
|
|
|
end = start + len;
|
2006-03-25 20:31:22 +01:00
|
|
|
real_start = start & qemu_host_page_mask;
|
|
|
|
real_end = HOST_PAGE_ALIGN(end);
|
2003-05-13 02:25:15 +02:00
|
|
|
|
2006-03-25 20:31:22 +01:00
|
|
|
if (start > real_start) {
|
2003-05-13 02:25:15 +02:00
|
|
|
/* handle host page containing start */
|
|
|
|
prot = 0;
|
2006-03-25 20:31:22 +01:00
|
|
|
for(addr = real_start; addr < start; addr += TARGET_PAGE_SIZE) {
|
2003-05-13 02:25:15 +02:00
|
|
|
prot |= page_get_flags(addr);
|
|
|
|
}
|
2006-03-25 20:31:22 +01:00
|
|
|
if (real_end == real_start + qemu_host_page_size) {
|
|
|
|
for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
2003-05-13 02:57:50 +02:00
|
|
|
prot |= page_get_flags(addr);
|
|
|
|
}
|
2006-03-25 20:31:22 +01:00
|
|
|
end = real_end;
|
2003-05-13 02:57:50 +02:00
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
if (prot != 0)
|
2006-03-25 20:31:22 +01:00
|
|
|
real_start += qemu_host_page_size;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2006-03-25 20:31:22 +01:00
|
|
|
if (end < real_end) {
|
2003-05-13 02:25:15 +02:00
|
|
|
prot = 0;
|
2006-03-25 20:31:22 +01:00
|
|
|
for(addr = end; addr < real_end; addr += TARGET_PAGE_SIZE) {
|
2003-05-13 02:25:15 +02:00
|
|
|
prot |= page_get_flags(addr);
|
|
|
|
}
|
|
|
|
if (prot != 0)
|
2006-03-25 20:31:22 +01:00
|
|
|
real_end -= qemu_host_page_size;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
2007-09-17 10:09:54 +02:00
|
|
|
|
2008-06-02 18:16:42 +02:00
|
|
|
ret = 0;
|
2003-05-13 02:25:15 +02:00
|
|
|
/* unmap what we can */
|
2006-03-25 20:31:22 +01:00
|
|
|
if (real_start < real_end) {
|
2015-08-24 14:53:54 +02:00
|
|
|
if (reserved_va) {
|
2010-05-29 03:27:35 +02:00
|
|
|
mmap_reserve(real_start, real_end - real_start);
|
|
|
|
} else {
|
2021-02-12 19:48:43 +01:00
|
|
|
ret = munmap(g2h_untagged(real_start), real_end - real_start);
|
2010-05-29 03:27:35 +02:00
|
|
|
}
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
|
2012-05-11 00:40:10 +02:00
|
|
|
if (ret == 0) {
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(start, start + len - 1, 0);
|
2012-05-11 00:40:10 +02:00
|
|
|
}
|
2008-06-02 18:16:42 +02:00
|
|
|
mmap_unlock();
|
|
|
|
return ret;
|
2003-05-13 02:25:15 +02:00
|
|
|
}
|
|
|
|
|
2007-10-14 18:27:31 +02:00
|
|
|
abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
|
|
|
|
abi_ulong new_size, unsigned long flags,
|
|
|
|
abi_ulong new_addr)
|
2003-05-13 02:25:15 +02:00
|
|
|
{
|
|
|
|
int prot;
|
2008-12-08 19:12:40 +01:00
|
|
|
void *host_addr;
|
2003-05-13 02:25:15 +02:00
|
|
|
|
2021-02-12 19:48:46 +01:00
|
|
|
if (!guest_range_valid_untagged(old_addr, old_size) ||
|
2018-03-07 22:50:10 +01:00
|
|
|
((flags & MREMAP_FIXED) &&
|
2021-02-12 19:48:46 +01:00
|
|
|
!guest_range_valid_untagged(new_addr, new_size)) ||
|
2021-01-08 18:42:12 +01:00
|
|
|
((flags & MREMAP_MAYMOVE) == 0 &&
|
2021-02-12 19:48:46 +01:00
|
|
|
!guest_range_valid_untagged(old_addr, new_size))) {
|
2018-03-07 22:50:10 +01:00
|
|
|
errno = ENOMEM;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2008-06-02 18:16:42 +02:00
|
|
|
mmap_lock();
|
2008-12-08 19:12:40 +01:00
|
|
|
|
2010-05-29 03:27:35 +02:00
|
|
|
if (flags & MREMAP_FIXED) {
|
2021-02-12 19:48:43 +01:00
|
|
|
host_addr = mremap(g2h_untagged(old_addr), old_size, new_size,
|
|
|
|
flags, g2h_untagged(new_addr));
|
2010-05-29 03:27:35 +02:00
|
|
|
|
2015-08-24 14:53:54 +02:00
|
|
|
if (reserved_va && host_addr != MAP_FAILED) {
|
2010-05-29 03:27:35 +02:00
|
|
|
/* 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) {
|
2008-12-08 19:12:40 +01:00
|
|
|
abi_ulong mmap_start;
|
|
|
|
|
2019-05-19 22:19:52 +02:00
|
|
|
mmap_start = mmap_find_vma(0, new_size, TARGET_PAGE_SIZE);
|
2008-12-08 19:12:40 +01:00
|
|
|
|
|
|
|
if (mmap_start == -1) {
|
|
|
|
errno = ENOMEM;
|
|
|
|
host_addr = MAP_FAILED;
|
2010-05-29 03:27:35 +02:00
|
|
|
} else {
|
2021-02-12 19:48:43 +01:00
|
|
|
host_addr = mremap(g2h_untagged(old_addr), old_size, new_size,
|
|
|
|
flags | MREMAP_FIXED,
|
|
|
|
g2h_untagged(mmap_start));
|
2015-08-24 14:53:54 +02:00
|
|
|
if (reserved_va) {
|
2010-09-14 07:22:34 +02:00
|
|
|
mmap_reserve(old_addr, old_size);
|
|
|
|
}
|
2010-05-29 03:27:35 +02:00
|
|
|
}
|
2008-12-15 18:58:49 +01:00
|
|
|
} else {
|
2010-05-29 03:27:35 +02:00
|
|
|
int prot = 0;
|
2015-08-24 14:53:54 +02:00
|
|
|
if (reserved_va && old_size < new_size) {
|
2010-05-29 03:27:35 +02:00
|
|
|
abi_ulong addr;
|
|
|
|
for (addr = old_addr + old_size;
|
|
|
|
addr < old_addr + new_size;
|
|
|
|
addr++) {
|
|
|
|
prot |= page_get_flags(addr);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (prot == 0) {
|
2021-02-12 19:48:43 +01:00
|
|
|
host_addr = mremap(g2h_untagged(old_addr),
|
|
|
|
old_size, new_size, flags);
|
2020-10-28 22:38:33 +01:00
|
|
|
|
|
|
|
if (host_addr != MAP_FAILED) {
|
|
|
|
/* Check if address fits target address space */
|
2021-02-12 19:48:46 +01:00
|
|
|
if (!guest_range_valid_untagged(h2g(host_addr), new_size)) {
|
2020-10-28 22:38:33 +01:00
|
|
|
/* Revert mremap() changes */
|
2021-02-12 19:48:43 +01:00
|
|
|
host_addr = mremap(g2h_untagged(old_addr),
|
|
|
|
new_size, old_size, flags);
|
2020-10-28 22:38:33 +01:00
|
|
|
errno = ENOMEM;
|
|
|
|
host_addr = MAP_FAILED;
|
|
|
|
} else if (reserved_va && old_size > new_size) {
|
|
|
|
mmap_reserve(old_addr + old_size, old_size - new_size);
|
|
|
|
}
|
2010-05-29 03:27:35 +02:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
errno = ENOMEM;
|
|
|
|
host_addr = MAP_FAILED;
|
|
|
|
}
|
2008-12-08 19:12:40 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
if (host_addr == MAP_FAILED) {
|
2008-06-02 18:16:42 +02:00
|
|
|
new_addr = -1;
|
|
|
|
} else {
|
|
|
|
new_addr = h2g(host_addr);
|
|
|
|
prot = page_get_flags(old_addr);
|
2023-03-05 23:51:09 +01:00
|
|
|
page_set_flags(old_addr, old_addr + old_size - 1, 0);
|
|
|
|
page_set_flags(new_addr, new_addr + new_size - 1,
|
2021-02-12 19:48:32 +01:00
|
|
|
prot | PAGE_VALID | PAGE_RESET);
|
2008-06-02 18:16:42 +02:00
|
|
|
}
|
|
|
|
mmap_unlock();
|
2003-05-13 02:25:15 +02:00
|
|
|
return new_addr;
|
|
|
|
}
|
2022-06-21 16:42:05 +02:00
|
|
|
|
2022-12-13 18:03:09 +01:00
|
|
|
static bool can_passthrough_madvise(abi_ulong start, abi_ulong end)
|
2022-06-21 16:42:05 +02:00
|
|
|
{
|
|
|
|
ulong addr;
|
|
|
|
|
|
|
|
if ((start | end) & ~qemu_host_page_mask) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (addr = start; addr < end; addr += TARGET_PAGE_SIZE) {
|
2022-09-06 02:08:38 +02:00
|
|
|
if (!(page_get_flags(addr) & PAGE_PASSTHROUGH)) {
|
2022-06-21 16:42:05 +02:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice)
|
|
|
|
{
|
|
|
|
abi_ulong len, end;
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (start & ~TARGET_PAGE_MASK) {
|
|
|
|
return -TARGET_EINVAL;
|
|
|
|
}
|
|
|
|
len = TARGET_PAGE_ALIGN(len_in);
|
|
|
|
|
|
|
|
if (len_in && !len) {
|
|
|
|
return -TARGET_EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
end = start + len;
|
|
|
|
if (end < start) {
|
|
|
|
return -TARGET_EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (end == start) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!guest_range_valid_untagged(start, len)) {
|
|
|
|
return -TARGET_EINVAL;
|
|
|
|
}
|
|
|
|
|
2022-12-13 18:03:09 +01:00
|
|
|
/* Translate for some architectures which have different MADV_xxx values */
|
|
|
|
switch (advice) {
|
|
|
|
case TARGET_MADV_DONTNEED: /* alpha */
|
|
|
|
advice = MADV_DONTNEED;
|
|
|
|
break;
|
|
|
|
case TARGET_MADV_WIPEONFORK: /* parisc */
|
|
|
|
advice = MADV_WIPEONFORK;
|
|
|
|
break;
|
|
|
|
case TARGET_MADV_KEEPONFORK: /* parisc */
|
|
|
|
advice = MADV_KEEPONFORK;
|
|
|
|
break;
|
|
|
|
/* we do not care about the other MADV_xxx values yet */
|
|
|
|
}
|
|
|
|
|
2022-06-21 16:42:05 +02:00
|
|
|
/*
|
2022-12-13 18:03:09 +01:00
|
|
|
* Most advice values are hints, so ignoring and returning success is ok.
|
|
|
|
*
|
|
|
|
* However, some advice values such as MADV_DONTNEED, MADV_WIPEONFORK and
|
|
|
|
* MADV_KEEPONFORK are not hints and need to be emulated.
|
2022-06-21 16:42:05 +02:00
|
|
|
*
|
2022-12-13 18:03:09 +01:00
|
|
|
* A straight passthrough for those may not be safe because qemu sometimes
|
|
|
|
* turns private file-backed mappings into anonymous mappings.
|
|
|
|
* can_passthrough_madvise() helps to check if a passthrough is possible by
|
|
|
|
* comparing mappings that are known to have the same semantics in the host
|
|
|
|
* and the guest. In this case passthrough is safe.
|
2022-06-21 16:42:05 +02:00
|
|
|
*
|
2022-12-13 18:03:09 +01:00
|
|
|
* We pass through MADV_WIPEONFORK and MADV_KEEPONFORK if possible and
|
|
|
|
* return failure if not.
|
|
|
|
*
|
|
|
|
* MADV_DONTNEED is passed through as well, 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.
|
2022-06-21 16:42:05 +02:00
|
|
|
*/
|
|
|
|
mmap_lock();
|
2022-12-13 18:03:09 +01:00
|
|
|
switch (advice) {
|
|
|
|
case MADV_WIPEONFORK:
|
|
|
|
case MADV_KEEPONFORK:
|
|
|
|
ret = -EINVAL;
|
|
|
|
/* fall through */
|
|
|
|
case MADV_DONTNEED:
|
|
|
|
if (can_passthrough_madvise(start, end)) {
|
|
|
|
ret = get_errno(madvise(g2h_untagged(start), len, advice));
|
|
|
|
if ((advice == MADV_DONTNEED) && (ret == 0)) {
|
2023-03-06 00:03:13 +01:00
|
|
|
page_reset_target_data(start, start + len - 1);
|
2022-12-13 18:03:09 +01:00
|
|
|
}
|
2022-07-12 00:00:28 +02:00
|
|
|
}
|
2022-06-21 16:42:05 +02:00
|
|
|
}
|
|
|
|
mmap_unlock();
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|