89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
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// Copyright 2020, VIXL authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef VIXL_EXAMPLE_EXECUTABLE_MEMORY_H_
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#define VIXL_EXAMPLE_EXECUTABLE_MEMORY_H_
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extern "C" {
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#include <stdint.h>
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#ifndef VIXL_INCLUDE_SIMULATOR_AARCH64
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#include <sys/mman.h>
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#endif
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}
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#include <cstdio>
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#include <string>
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#include "aarch64/assembler-aarch64.h"
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#include "aarch64/constants-aarch64.h"
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#include "aarch64/cpu-aarch64.h"
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#include "aarch64/macro-assembler-aarch64.h"
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#ifndef VIXL_INCLUDE_SIMULATOR_AARCH64
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class ExecutableMemory {
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public:
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ExecutableMemory(const vixl::byte* code_start, size_t size)
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: size_(size),
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buffer_(reinterpret_cast<vixl::byte*>(mmap(NULL,
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size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_ANONYMOUS,
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-1,
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0))) {
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VIXL_CHECK(buffer_ != MAP_FAILED);
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memcpy(buffer_, code_start, size_);
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vixl::aarch64::CPU::EnsureIAndDCacheCoherency(buffer_, size_);
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int res = mprotect(buffer_, size_, PROT_READ | PROT_EXEC);
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VIXL_CHECK(res == 0);
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}
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~ExecutableMemory() { munmap(buffer_, size_); }
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template <typename T>
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T GetEntryPoint(const vixl::aarch64::Label& entry_point) const {
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int64_t location = entry_point.GetLocation();
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return GetOffsetAddress<T>(location);
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}
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private:
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template <typename T>
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T GetOffsetAddress(int64_t offset) const {
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VIXL_ASSERT((offset >= 0) && (static_cast<size_t>(offset) <= size_));
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T function_address;
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vixl::byte* buffer_address = buffer_ + offset;
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VIXL_STATIC_ASSERT(sizeof(T) == sizeof(buffer_address));
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memcpy(&function_address, &buffer_address, sizeof(T));
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return function_address;
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}
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size_t size_;
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vixl::byte* buffer_;
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};
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#endif
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#endif // VIXL_EXAMPLE_EXECUTABLE_MEMORY_H_
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