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vm: implement vm::try_access, vm::ptr::try_read/write

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This commit is contained in:
Nekotekina 2019-11-26 00:01:05 +03:00
parent 1b9a3e6077
commit 2290c389d6
4 changed files with 56 additions and 4 deletions
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41
rpcs3/Emu/Memory/vm.cpp
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@ -1078,6 +1078,47 @@ namespace vm
return _map(addr, area_size, flags);
}
bool try_access(u32 addr, void* ptr, u32 size, bool is_write)
{
vm::reader_lock lock;
if (size == 0)
{
return true;
}
if (vm::check_addr(addr, size, is_write ? page_writable : page_readable))
{
void* src = vm::g_sudo_addr + addr;
void* dst = ptr;
if (is_write)
std::swap(src, dst);
if (size <= 16 && utils::popcnt32(size) == 1 && (addr & (size - 1)) == 0)
{
if (is_write)
{
switch (size)
{
case 1: atomic_storage<u8>::release(*static_cast<u8*>(dst), *static_cast<u8*>(src)); break;
case 2: atomic_storage<u16>::release(*static_cast<u16*>(dst), *static_cast<u16*>(src)); break;
case 4: atomic_storage<u32>::release(*static_cast<u32*>(dst), *static_cast<u32*>(src)); break;
case 8: atomic_storage<u64>::release(*static_cast<u64*>(dst), *static_cast<u64*>(src)); break;
case 16: _mm_store_si128(static_cast<__m128i*>(dst), _mm_loadu_si128(static_cast<__m128i*>(src))); break;
}
return true;
}
}
std::memcpy(dst, src, size);
return true;
}
return false;
}
inline namespace ps3_
{
void init()