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Use ashmem instead of memfd_create on Android. (#816) 

* Use ashmem instead of memfd_create on Android.

* Fix code styling issues.

* fix small mistake in merge commit

Co-authored-by: RSDuck <RSDuck@users.noreply.github.com>
This commit is contained in:
Filippo Scognamiglio 2020-11-30 15:33:43 +01:00 committed by GitHub
parent 7da4550eea
commit acb272ed78
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1 changed files with 35 additions and 8 deletions
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43
src/ARMJIT_Memory.cpp
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@ -10,6 +10,12 @@
#include <signal.h>
#endif
#if defined(__ANDROID__)
#include <dlfcn.h>
#include <linux/ashmem.h>
#include <sys/ioctl.h>
#endif
#include "ARMJIT_Memory.h"
#include "ARMJIT_Internal.h"
@ -58,6 +64,10 @@ struct FaultDescription
bool FaultHandler(FaultDescription& faultDesc);
}
#if defined(__ANDROID__)
#define ASHMEM_DEVICE "/dev/ashmem"
#endif
#if defined(__SWITCH__)
// with LTO the symbols seem to be not properly overriden
// if they're somewhere else
@ -712,14 +722,31 @@ void Init()
FastMem7Start = MemoryBase + AddrSpaceSize;
MemoryBase = MemoryBase + AddrSpaceSize*2;
#ifdef __APPLE__
char* fastmemPidName = new char[snprintf(NULL, 0, "melondsfastmem%d", getpid()) + 1];
sprintf(fastmemPidName, "melondsfastmem%d", getpid());
MemoryFile = shm_open(fastmemPidName, O_RDWR|O_CREAT, 0600);
delete[] fastmemPidName;
#else
MemoryFile = memfd_create("melondsfastmem", 0);
#endif
#if defined(__ANDROID__)
static void* libandroid = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
using type_ASharedMemory_create = int(*)(const char* name, size_t size);
static void* symbol = dlsym(libandroid, "ASharedMemory_create");
static auto shared_memory_create = reinterpret_cast<type_ASharedMemory_create>(symbol);
if (shared_memory_create)
{
MemoryFile = shared_memory_create("melondsfastmem", MemoryTotalSize);
}
else
{
int fd = open(ASHMEM_DEVICE, O_RDWR);
ioctl(fd, ASHMEM_SET_NAME, "melondsfastmem");
ioctl(fd, ASHMEM_SET_SIZE, MemoryTotalSize);
MemoryFile = fd;
}
#elif defined(__APPLE__)
char* fastmemPidName = new char[snprintf(NULL, 0, "melondsfastmem%d", getpid()) + 1];
sprintf(fastmemPidName, "melondsfastmem%d", getpid());
MemoryFile = shm_open(fastmemPidName, O_RDWR|O_CREAT, 0600);
delete[] fastmemPidName;
#else
MemoryFile = memfd_create("melondsfastmem", 0);
#endif
ftruncate(MemoryFile, MemoryTotalSize);
struct sigaction sa;