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SPU LLVM: Add CRC check for cache

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Eladash 2023-09-02 11:55:21 +03:00 • committed by Elad Ashkenazi
parent 66b6bae596
commit dd4840caf6
1 changed files with 46 additions and 12 deletions
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58
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -565,6 +565,21 @@ extern void utilize_spu_data_segment(u32 vaddr, const void* ls_data_vaddr, u32 s
g_fxo->get<spu_cache>().precompile_funcs.push(std::move(obj));
}
// For SPU cache validity check
static u16 calculate_crc16(const uchar* data, usz length)
{
u16 crc = umax;
while (length--)
{
u8 x = (crc >> 8) ^ *data++;
x ^= (x >> 4);
crc = static_cast<u16>((crc << 8) ^ (x << 12) ^ (x << 5) ^ x);
}
return crc;
}
std::deque<spu_program> spu_cache::get()
{
std::deque<spu_program> result;
@ -579,20 +594,29 @@ std::deque<spu_program> spu_cache::get()
// TODO: signal truncated or otherwise broken file
while (true)
{
be_t<u32> size;
be_t<u32> addr;
struct block_info_t
{
be_t<u16> crc;
be_t<u16> size;
be_t<u32> addr;
} block_info{};
if (!m_file.read(block_info))
{
break;
}
const u32 crc = block_info.crc;
const u32 size = block_info.size;
const u32 addr = block_info.addr;
if (utils::add_saturate<u32>(addr, size * 4) > SPU_LS_SIZE)
{
break;
}
std::vector<u32> func;
if (!m_file.read(size) || !m_file.read(addr))
{
break;
}
if (utils::add_saturate<u32>(addr, utils::mul_saturate<u32>(size, 4)) > SPU_LS_SIZE)
{
break;
}
if (!m_file.read(func, size))
{
break;
@ -604,6 +628,13 @@ std::deque<spu_program> spu_cache::get()
continue;
}
// CRC check is optional to be compatible with old format
if (crc && std::max<u32>(calculate_crc16(reinterpret_cast<const uchar*>(func.data()), size * 4), 1) != crc)
{
// Invalid, but continue anyway
continue;
}
spu_program res;
res.entry_point = addr;
res.lower_bound = addr;
@ -624,6 +655,9 @@ void spu_cache::add(const spu_program& func)
be_t<u32> size = ::size32(func.data);
be_t<u32> addr = func.entry_point;
// Add CRC (forced non-zero)
size |= std::max<u32>(calculate_crc16(reinterpret_cast<const uchar*>(func.data.data()), size * 4), 1) << 16;
const fs::iovec_clone gather[3]
{
{&size, sizeof(size)},