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MemArenaAndroid.cpp
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MemArenaAndroid.cpp
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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include "ppsspp_config.h"
#ifdef __ANDROID__
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <cerrno>
#include <sys/ioctl.h>
#include <linux/ashmem.h>
#include <dlfcn.h>
#include "Common/Log.h"
#include "Common/MemoryUtil.h"
#include "Common/MemArena.h"
#include "Common/StringUtils.h"
#include "Common/System/System.h"
// Hopefully this ABI will never change...
#define ASHMEM_DEVICE "/dev/ashmem"
bool MemArena::NeedsProbing() {
return false;
}
// ashmem_create_region - creates a new ashmem region and returns the file
// descriptor, or <0 on error
// This function is defined in much later version of the ndk, so we can only access it via dlopen().
// `name' is an optional label to give the region (visible in /proc/pid/maps)
// `size' is the size of the region, in page-aligned bytes
static int ashmem_create_region(const char *name, size_t size) {
static void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
using type_ASharedMemory_create = int(*)(const char *name, size_t size);
static type_ASharedMemory_create function_create = nullptr;
if (handle != nullptr) {
function_create =
reinterpret_cast<type_ASharedMemory_create>(dlsym(handle, "ASharedMemory_create"));
}
if (function_create != nullptr) {
return function_create(name, size);
} else {
return -1;
}
}
// legacy_ashmem_create_region - creates a new ashmem region and returns the file
// descriptor, or <0 on error
// `name' is an optional label to give the region (visible in /proc/pid/maps)
// `size' is the size of the region, in page-aligned bytes
static int legacy_ashmem_create_region(const char *name, size_t size) {
int fd = open(ASHMEM_DEVICE, O_RDWR);
if (fd < 0)
return fd;
int ret;
if (name) {
char buf[ASHMEM_NAME_LEN];
truncate_cpy(buf, name);
ret = ioctl(fd, ASHMEM_SET_NAME, buf);
if (ret < 0)
goto error;
}
ret = ioctl(fd, ASHMEM_SET_SIZE, size);
if (ret < 0)
goto error;
return fd;
error:
ERROR_LOG(MEMMAP, "NASTY ASHMEM ERROR: ret = %08x", ret);
close(fd);
return ret;
}
// Windows mappings need to be on 64K boundaries, due to Alpha legacy.
size_t MemArena::roundup(size_t x) {
return x;
}
bool MemArena::GrabMemSpace(size_t size) {
// Use ashmem so we don't have to allocate a file on disk!
const char* name = "PPSSPP_RAM";
// Since version 26 Android provides a new api for accessing SharedMemory.
if (System_GetPropertyInt(SYSPROP_SYSTEMVERSION) >= 26) {
fd = ashmem_create_region(name, size);
} else {
fd = legacy_ashmem_create_region(name, size);
}
// Note that it appears that ashmem is pinned by default, so no need to pin.
if (fd < 0) {
ERROR_LOG(MEMMAP, "Failed to grab ashmem space of size: %08x errno: %d", (int)size, (int)(errno));
return false;
}
return true;
}
void MemArena::ReleaseSpace() {
close(fd);
}
void *MemArena::CreateView(s64 offset, size_t size, void *base) {
void *retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED | ((base == 0) ? 0 : MAP_FIXED), fd, offset);
if (retval == MAP_FAILED) {
NOTICE_LOG(MEMMAP, "mmap on ashmem (fd: %d) failed", (int)fd);
return nullptr;
}
return retval;
}
void MemArena::ReleaseView(s64 offset, void* view, size_t size) {
munmap(view, size);
}
u8* MemArena::Find4GBBase() {
#if PPSSPP_ARCH(64BIT)
// We should probably just go look in /proc/self/maps for some free space.
// But let's try the anonymous mmap trick, just like on 32-bit, but bigger and
// aligned to 4GB for the movk trick. We can ensure that we get an aligned 4GB
// address by grabbing 8GB and aligning the pointer.
const uint64_t EIGHT_GIGS = 0x200000000ULL;
void *base = mmap(0, EIGHT_GIGS, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
if (base && base != MAP_FAILED) {
INFO_LOG(SYSTEM, "base: %p", base);
uint64_t aligned_base = ((uint64_t)base + 0xFFFFFFFF) & ~0xFFFFFFFFULL;
INFO_LOG(SYSTEM, "aligned_base: %p", (void *)aligned_base);
munmap(base, EIGHT_GIGS);
return reinterpret_cast<u8 *>(aligned_base);
} else {
u8 *hardcoded_ptr = reinterpret_cast<u8*>(0x2300000000ULL);
INFO_LOG(SYSTEM, "Failed to anonymously map 8GB. Fall back to the hardcoded pointer %p.", hardcoded_ptr);
// Just grab some random 4GB...
// This has been known to fail lately though, see issue #12249.
return hardcoded_ptr;
}
#else
// Address masking is used in 32-bit mode, so we can get away with less memory.
void *base = mmap(0, 0x10000000, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
if (base == MAP_FAILED) {
ERROR_LOG(SYSTEM, "Failed to map 256 MB of memory space: %s", strerror(errno));
return nullptr;
}
munmap(base, 0x10000000);
return static_cast<u8*>(base);
#endif
}
#endif // __ANDROID__