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PPU: Do not allow unaligned/unmapped reservation addresses

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Eladash 2020-09-10 06:27:55 +03:00 committed by Megamouse
parent 595fdb2f57
commit d489b02fc1
1 changed files with 19 additions and 2 deletions
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21
rpcs3/Emu/Cell/PPUThread.cpp
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@ -1076,7 +1076,12 @@ static void ppu_trace(u64 addr)
template <typename T>
static T ppu_load_acquire_reservation(ppu_thread& ppu, u32 addr)
{
// Always load aligned 64-bit value (unaligned reservation will fail to store)
if (addr % sizeof(T))
{
fmt::throw_exception("PPU %s: Unaligned address: 0x%08x" HERE, sizeof(T) == 4 ? "LWARX" : "LDARX", addr);
}
// Always load aligned 64-bit value
auto& data = vm::_ref<const atomic_be_t<u64>>(addr & -8);
const u64 size_off = (sizeof(T) * 8) & 63;
const u64 data_off = (addr & 7) * 8;
@ -1228,14 +1233,26 @@ const auto ppu_stdcx_tx = build_function_asm<u32(*)(u32 raddr, u64 rtime, u64 rd
template <typename T>
static bool ppu_store_reservation(ppu_thread& ppu, u32 addr, T reg_value)
{
if (addr % sizeof(T))
{
fmt::throw_exception("PPU %s: Unaligned address: 0x%08x" HERE, sizeof(T) == 4 ? "STWCX" : "STDCX", addr);
}
auto& data = vm::_ref<atomic_be_t<T>>(addr & (0 - sizeof(T)));
constexpr u64 size_off = (sizeof(T) * 8) & 63;
const T old_data = static_cast<T>(ppu.rdata << ((addr & 7) * 8) >> size_off);
auto& res = vm::reservation_acquire(addr, sizeof(T));
if (std::exchange(ppu.raddr, 0) != addr || addr % sizeof(T) || old_data != data || ppu.rtime != (res & -128))
if (std::exchange(ppu.raddr, 0) != addr || old_data != data || ppu.rtime != (res & -128))
{
// Even when the reservation address does not match the target address must be valid
if (!vm::check_addr(addr, 1, vm::page_writable))
{
// Access violate
data += 0;
}
return false;
}