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d7c532d889
There are still some other issues not addressed here, but it's a start. Workarounds for false-positive reports: - `RasterizerAccelerated`: Put a gigantic array behind a `unique_ptr`, because UBSan has a [hardcoded limit](https://stackoverflow.com/questions/64531383/c-runtime-error-using-fsanitize-undefined-object-has-a-possibly-invalid-vp) of how big it thinks objects can be, specifically when dealing with offset-to-top values used with multiple inheritance. Hopefully this doesn't have a performance impact. - `QueryCacheBase::QueryCacheBase`: Avoid an operation that UBSan thinks is UB even though it at least arguably isn't. See the link in the comment for more information. Fixes for correct reports: - `PageTable`, `Memory`: Use `uintptr_t` values instead of pointers to avoid UB from pointer overflow (when pointer arithmetic wraps around the address space). - `KScheduler::Reload`: `thread->GetOwnerProcess()` can be `nullptr`; avoid calling methods on it in this case. (The existing code returns a garbage reference to a field, which is then passed into `LoadWatchpointArray`, and apparently it's never used, so it's harmless in practice but still triggers UBSan.) - `KAutoObject::Close`: This function calls `this->Destroy()`, which overwrites the beginning of the object with junk (specifically a free list pointer). Then it calls `this->UnregisterWithKernel()`. UBSan complains about a type mismatch because the vtable has been overwritten, and I believe this is indeed UB. `UnregisterWithKernel` also loads `m_kernel` from the 'freed' object, which seems to be technically safe (the overwriting doesn't extend as far as that field), but seems dubious. Switch to a `static` method and load `m_kernel` in advance.
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <atomic>
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "common/div_ceil.h"
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#include "core/memory.h"
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#include "video_core/rasterizer_accelerated.h"
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namespace VideoCore {
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using namespace Core::Memory;
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RasterizerAccelerated::RasterizerAccelerated(Memory& cpu_memory_)
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: cached_pages(std::make_unique<CachedPages>()), cpu_memory{cpu_memory_} {}
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RasterizerAccelerated::~RasterizerAccelerated() = default;
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void RasterizerAccelerated::UpdatePagesCachedCount(VAddr addr, u64 size, int delta) {
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u64 uncache_begin = 0;
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u64 cache_begin = 0;
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u64 uncache_bytes = 0;
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u64 cache_bytes = 0;
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std::atomic_thread_fence(std::memory_order_acquire);
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const u64 page_end = Common::DivCeil(addr + size, YUZU_PAGESIZE);
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for (u64 page = addr >> YUZU_PAGEBITS; page != page_end; ++page) {
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std::atomic_uint16_t& count = cached_pages->at(page >> 2).Count(page);
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if (delta > 0) {
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ASSERT_MSG(count.load(std::memory_order::relaxed) < UINT16_MAX, "Count may overflow!");
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} else if (delta < 0) {
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ASSERT_MSG(count.load(std::memory_order::relaxed) > 0, "Count may underflow!");
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} else {
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ASSERT_MSG(false, "Delta must be non-zero!");
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}
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// Adds or subtracts 1, as count is a unsigned 8-bit value
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count.fetch_add(static_cast<u16>(delta), std::memory_order_release);
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// Assume delta is either -1 or 1
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if (count.load(std::memory_order::relaxed) == 0) {
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if (uncache_bytes == 0) {
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uncache_begin = page;
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}
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uncache_bytes += YUZU_PAGESIZE;
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} else if (uncache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(uncache_begin << YUZU_PAGEBITS, uncache_bytes,
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false);
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uncache_bytes = 0;
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}
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if (count.load(std::memory_order::relaxed) == 1 && delta > 0) {
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if (cache_bytes == 0) {
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cache_begin = page;
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}
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cache_bytes += YUZU_PAGESIZE;
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} else if (cache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(cache_begin << YUZU_PAGEBITS, cache_bytes, true);
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cache_bytes = 0;
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}
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}
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if (uncache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(uncache_begin << YUZU_PAGEBITS, uncache_bytes, false);
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}
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if (cache_bytes > 0) {
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cpu_memory.RasterizerMarkRegionCached(cache_begin << YUZU_PAGEBITS, cache_bytes, true);
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}
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}
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} // namespace VideoCore
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