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Diffstat (limited to '')
-rw-r--r-- | src/core/hle/service/jit/jit_code_memory.cpp | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/core/hle/service/jit/jit_code_memory.cpp b/src/core/hle/service/jit/jit_code_memory.cpp new file mode 100644 index 000000000..2b480488a --- /dev/null +++ b/src/core/hle/service/jit/jit_code_memory.cpp @@ -0,0 +1,54 @@ +// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#include "core/hle/service/jit/jit_code_memory.h" + +namespace Service::JIT { + +Result CodeMemory::Initialize(Kernel::KProcess& process, Kernel::KCodeMemory& code_memory, + size_t size, Kernel::Svc::MemoryPermission perm, + std::mt19937_64& generate_random) { + auto& page_table = process.GetPageTable(); + const u64 alias_code_start = + GetInteger(page_table.GetAliasCodeRegionStart()) / Kernel::PageSize; + const u64 alias_code_size = page_table.GetAliasCodeRegionSize() / Kernel::PageSize; + + // NOTE: This will retry indefinitely until mapping the code memory succeeds. + while (true) { + // Generate a new trial address. + const u64 mapped_address = + (alias_code_start + (generate_random() % alias_code_size)) * Kernel::PageSize; + + // Try to map the address + R_TRY_CATCH(code_memory.MapToOwner(mapped_address, size, perm)) { + R_CATCH(Kernel::ResultInvalidMemoryRegion) { + // If we could not map here, retry. + continue; + } + } + R_END_TRY_CATCH; + + // Set members. + m_code_memory = std::addressof(code_memory); + m_size = size; + m_address = mapped_address; + m_perm = perm; + + // Open a new reference to the code memory. + m_code_memory->Open(); + + // We succeeded. + R_SUCCEED(); + } +} + +void CodeMemory::Finalize() { + if (m_code_memory) { + R_ASSERT(m_code_memory->UnmapFromOwner(m_address, m_size)); + m_code_memory->Close(); + } + + m_code_memory = nullptr; +} + +} // namespace Service::JIT |