From b3587102d160fb74a12935a79f06ee8a12712f12 Mon Sep 17 00:00:00 2001 From: ReinUsesLisp Date: Tue, 29 Dec 2020 21:16:57 -0300 Subject: core/memory: Read and write page table atomically Squash attributes into the pointer's integer, making them an uintptr_t pair containing 2 bits at the bottom and then the pointer. These bits are currently unused thanks to alignment requirements. Configure Dynarmic to mask out these bits on pointer reads. While we are at it, remove some unused attributes carried over from Citra. Read/Write and other hot functions use a two step unpacking process that is less readable to stop MSVC from emitting an extra AND instruction in the hot path: mov rdi,rcx shr rdx,0Ch mov r8,qword ptr [rax+8] mov rax,qword ptr [r8+rdx*8] mov rdx,rax -and al,3 and rdx,0FFFFFFFFFFFFFFFCh je Core::Memory::Memory::Impl::Read mov rax,qword ptr [vaddr] movzx eax,byte ptr [rdx+rax] --- src/core/arm/dynarmic/arm_dynarmic_32.cpp | 1 + src/core/arm/dynarmic/arm_dynarmic_64.cpp | 1 + 2 files changed, 2 insertions(+) (limited to 'src/core/arm') diff --git a/src/core/arm/dynarmic/arm_dynarmic_32.cpp b/src/core/arm/dynarmic/arm_dynarmic_32.cpp index e9c74b1a6..8aaf11eee 100644 --- a/src/core/arm/dynarmic/arm_dynarmic_32.cpp +++ b/src/core/arm/dynarmic/arm_dynarmic_32.cpp @@ -133,6 +133,7 @@ std::shared_ptr ARM_Dynarmic_32::MakeJit(Common::PageTable& config.page_table = reinterpret_cast*>( page_table.pointers.data()); config.absolute_offset_page_table = true; + config.page_table_pointer_mask_bits = Common::PageTable::ATTRIBUTE_BITS; config.detect_misaligned_access_via_page_table = 16 | 32 | 64 | 128; config.only_detect_misalignment_via_page_table_on_page_boundary = true; diff --git a/src/core/arm/dynarmic/arm_dynarmic_64.cpp b/src/core/arm/dynarmic/arm_dynarmic_64.cpp index 7a4eb88a2..d2e1dc724 100644 --- a/src/core/arm/dynarmic/arm_dynarmic_64.cpp +++ b/src/core/arm/dynarmic/arm_dynarmic_64.cpp @@ -152,6 +152,7 @@ std::shared_ptr ARM_Dynarmic_64::MakeJit(Common::PageTable& // Memory config.page_table = reinterpret_cast(page_table.pointers.data()); config.page_table_address_space_bits = address_space_bits; + config.page_table_pointer_mask_bits = Common::PageTable::ATTRIBUTE_BITS; config.silently_mirror_page_table = false; config.absolute_offset_page_table = true; config.detect_misaligned_access_via_page_table = 16 | 32 | 64 | 128; -- cgit v1.2.3