127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
// SPDX-FileCopyrightText: Copyright (c) 2022 merryhime <https://mary.rs>
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// SPDX-License-Identifier: MIT
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#pragma once
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#include <algorithm>
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#include <cstddef>
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#include <cstdint>
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#include <new>
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#if defined(_WIN32)
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# include <windows.h>
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#elif defined(__APPLE__)
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# include <libkern/OSCacheControl.h>
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# include <pthread.h>
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# include <sys/mman.h>
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# include <unistd.h>
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#else
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# include <sys/mman.h>
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#endif
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namespace oaknut {
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class CodeBlock {
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public:
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explicit CodeBlock(std::size_t size)
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: m_size(size)
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{
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#if defined(_WIN32)
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m_memory = (std::uint32_t*)VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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#elif defined(__APPLE__)
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m_memory = (std::uint32_t*)mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE | MAP_JIT, -1, 0);
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#else
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m_memory = (std::uint32_t*)mmap(nullptr, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
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#endif
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if (m_memory == nullptr)
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throw std::bad_alloc{};
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}
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~CodeBlock()
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{
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if (m_memory == nullptr)
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return;
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#if defined(_WIN32)
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VirtualFree((void*)m_memory, 0, MEM_RELEASE);
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#else
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munmap(m_memory, m_size);
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#endif
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}
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CodeBlock(const CodeBlock&) = delete;
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CodeBlock& operator=(const CodeBlock&) = delete;
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CodeBlock(CodeBlock&&) = delete;
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CodeBlock& operator=(CodeBlock&&) = delete;
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std::uint32_t* ptr() const
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{
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return m_memory;
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}
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void protect()
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{
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#if defined(__APPLE__)
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pthread_jit_write_protect_np(1);
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#endif
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}
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void unprotect()
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{
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#if defined(__APPLE__)
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pthread_jit_write_protect_np(0);
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#endif
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}
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void invalidate(std::uint32_t* mem, std::size_t size)
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{
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#if defined(__APPLE__)
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sys_icache_invalidate(mem, size);
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#else
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static std::size_t icache_line_size = 0x10000, dcache_line_size = 0x10000;
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std::uint64_t ctr;
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__asm__ volatile("mrs %0, ctr_el0"
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: "=r"(ctr));
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const std::size_t isize = icache_line_size = std::min<std::size_t>(icache_line_size, 4 << ((ctr >> 0) & 0xf));
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const std::size_t dsize = dcache_line_size = std::min<std::size_t>(dcache_line_size, 4 << ((ctr >> 16) & 0xf));
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const std::uintptr_t end = (std::uintptr_t)mem + size;
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for (std::uintptr_t addr = ((std::uintptr_t)mem) & ~(dsize - 1); addr < end; addr += dsize) {
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__asm__ volatile("dc cvau, %0"
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:
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: "r"(addr)
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: "memory");
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}
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__asm__ volatile("dsb ish\n"
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:
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:
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: "memory");
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for (std::uintptr_t addr = ((std::uintptr_t)mem) & ~(isize - 1); addr < end; addr += isize) {
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__asm__ volatile("ic ivau, %0"
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:
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: "r"(addr)
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: "memory");
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}
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__asm__ volatile("dsb ish\nisb\n"
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:
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:
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: "memory");
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#endif
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}
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void invalidate_all()
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{
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invalidate(m_memory, m_size);
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}
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protected:
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std::uint32_t* m_memory;
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std::size_t m_size = 0;
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};
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} // namespace oaknut
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