mirror of
https://github.com/dolphin-emu/dolphin.git
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127 lines
3.1 KiB
C++
127 lines
3.1 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "Common/MemArena.h"
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#include <cerrno>
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#include <cstddef>
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#include <cstdlib>
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#include <cstring>
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#include <set>
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#include <string>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include <linux/ashmem.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "Common/CommonFuncs.h"
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#include "Common/CommonTypes.h"
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#include "Common/Logging/Log.h"
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#include "Common/MsgHandler.h"
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#include "Common/StringUtil.h"
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namespace Common
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{
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#define ASHMEM_DEVICE "/dev/ashmem"
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static int AshmemCreateFileMapping(const char* name, size_t size)
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{
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// ASharedMemory path - works on API >= 26 and falls through on API < 26:
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// We can't call ASharedMemory_create the normal way without increasing the
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// minimum version requirement to API 26, so we use dlopen/dlsym instead
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static void* libandroid = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
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static auto shared_memory_create =
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reinterpret_cast<int (*)(const char*, size_t)>(dlsym(libandroid, "ASharedMemory_create"));
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if (shared_memory_create)
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return shared_memory_create(name, size);
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// /dev/ashmem path - works on API < 29:
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int fd, ret;
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fd = open(ASHMEM_DEVICE, O_RDWR);
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if (fd < 0)
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return fd;
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// We don't really care if we can't set the name, it is optional
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ioctl(fd, ASHMEM_SET_NAME, name);
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ret = ioctl(fd, ASHMEM_SET_SIZE, size);
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if (ret < 0)
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{
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close(fd);
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NOTICE_LOG_FMT(MEMMAP, "Ashmem returned error: {:#010x}", ret);
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return ret;
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}
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return fd;
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}
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MemArena::MemArena() = default;
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MemArena::~MemArena() = default;
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void MemArena::GrabSHMSegment(size_t size)
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{
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fd = AshmemCreateFileMapping(("dolphin-emu." + std::to_string(getpid())).c_str(), size);
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if (fd < 0)
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NOTICE_LOG_FMT(MEMMAP, "Ashmem allocation failed");
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}
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void MemArena::ReleaseSHMSegment()
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{
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close(fd);
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}
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void* MemArena::CreateView(s64 offset, size_t size)
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{
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return MapInMemoryRegion(offset, size, nullptr);
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}
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void MemArena::ReleaseView(void* view, size_t size)
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{
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UnmapFromMemoryRegion(view, size);
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}
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u8* MemArena::ReserveMemoryRegion(size_t memory_size)
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{
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// Android 4.3 changed how mmap works.
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// if we map it private and then munmap it, we can't use the base returned.
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// This may be due to changes in them to support a full SELinux implementation.
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const int flags = MAP_ANON | MAP_SHARED;
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void* base = mmap(nullptr, memory_size, PROT_NONE, flags, -1, 0);
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if (base == MAP_FAILED)
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{
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PanicAlertFmt("Failed to map enough memory space: {}", LastStrerrorString());
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return nullptr;
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}
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munmap(base, memory_size);
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return static_cast<u8*>(base);
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}
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void MemArena::ReleaseMemoryRegion()
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{
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}
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void* MemArena::MapInMemoryRegion(s64 offset, size_t size, void* base)
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{
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void* retval = mmap(base, size, PROT_READ | PROT_WRITE,
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MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
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if (retval == MAP_FAILED)
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{
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NOTICE_LOG_FMT(MEMMAP, "mmap failed");
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return nullptr;
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}
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else
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{
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return retval;
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}
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}
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void MemArena::UnmapFromMemoryRegion(void* view, size_t size)
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{
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munmap(view, size);
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}
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} // namespace Common
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