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Proper ashmem code for Android

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wheremyfoodat 2024-12-01 14:42:39 +02:00
parent f7dc10bc41
commit b98d009366
1 changed files with 40 additions and 14 deletions
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54
third_party/host_memory/host_memory.cpp vendored
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@ -5,10 +5,6 @@
#define ARCHITECTURE_arm64
#endif
#ifndef __ANDROID__
#define USING_FD
#endif
#ifdef _WIN32
#include <windows.h>
@ -36,10 +32,9 @@
#define MAP_NORESERVE 0
#endif
#ifdef USING_FD
#define MAYBE_ANONYMOUS(flags) (flags)
#else
#define MAYBE_ANONYMOUS(flags) (flags) | MAP_ANONYMOUS
// On Android, include ioctl for the shared memory ioctls
#ifdef __ANDROID__
#include <sys/ioctl.h>
#endif
#endif // ^^^ Linux ^^^
@ -370,8 +365,40 @@ namespace Common {
#elif defined(__linux__) || defined(__FreeBSD__) // ^^^ Windows ^^^ vvv Linux vvv
#ifdef ARCHITECTURE_arm64
#ifdef __ANDROID__
#define ASHMEM_DEVICE "/dev/ashmem"
// Android shared memory creation code from Dolphin
static int AshmemCreateFileMapping(const char* name, size_t size) {
// ASharedMemory path - works on API >= 26 and falls through on API < 26:
// We can't call ASharedMemory_create the normal way without increasing the
// minimum version requirement to API 26, so we use dlopen/dlsym instead
static void* libandroid = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
static auto sharedMemoryCreate = reinterpret_cast<int (*)(const char*, size_t)>(dlsym(libandroid, "ASharedMemory_create"));
if (sharedMemoryCreate) {
return sharedMemoryCreate(name, size);
}
// /dev/ashmem path - works on API < 29:
int fd, ret;
fd = open(ASHMEM_DEVICE, O_RDWR);
if (fd < 0) return fd;
// We don't really care if we can't set the name, it is optional
ioctl(fd, ASHMEM_SET_NAME, name);
ret = ioctl(fd, ASHMEM_SET_SIZE, size);
if (ret < 0) {
close(fd);
Helpers::warn("Ashmem allocation failed");
return ret;
}
return fd;
}
#endif
#ifdef ARCHITECTURE_arm64
static void* ChooseVirtualBase(size_t virtual_size) {
constexpr uintptr_t Map39BitSize = (1ULL << 39);
constexpr uintptr_t Map36BitSize = (1ULL << 36);
@ -446,13 +473,12 @@ namespace Common {
#if defined(__FreeBSD__) && __FreeBSD__ < 13
// XXX Drop after FreeBSD 12.* reaches EOL on 2024-06-30
fd = shm_open(SHM_ANON, O_RDWR, 0600);
#elif defined(USING_FD)
fd = memfd_create("HostMemory", 0);
#elif defined(__ANDROID__)
fd = AshmemCreateFileMapping("HostMemory", 0);
#else
fd = -1;
fd = memfd_create("HostMemory", 0);
#endif
#ifdef USING_FD
if (fd < 0) {
Helpers::warn("memfd_create failed: {}", strerror(errno));
throw std::bad_alloc{};
@ -464,7 +490,7 @@ namespace Common {
Helpers::warn("ftruncate failed with {}, are you out-of-memory?", strerror(errno));
throw std::bad_alloc{};
}
#endif
backing_base = static_cast<u8*>(mmap(nullptr, backing_size, PROT_READ | PROT_WRITE, MAYBE_ANONYMOUS(MAP_SHARED), fd, 0));
if (backing_base == MAP_FAILED) {