mirror of
https://github.com/openharmony/third_party_vixl.git
synced 2026-07-01 20:54:04 -04:00
Alexandre Rames
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
// Copyright 2015, 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_EXAMPLES_H_
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#define VIXL_EXAMPLE_EXAMPLES_H_
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#include <stdio.h>
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#include <stdint.h>
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#ifndef VIXL_INCLUDE_SIMULATOR
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#include <sys/mman.h>
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#endif
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#include <string>
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#include "a32/constants-a32.h"
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#include "a32/instructions-a32.h"
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#include "a32/macro-assembler-a32.h"
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using namespace vixl::aarch32;
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#ifndef VIXL_INCLUDE_SIMULATOR
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class ExecutableMemory {
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public:
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ExecutableMemory(const byte* code_start, size_t size)
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: size_(size),
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buffer_(reinterpret_cast<byte*>(mmap(NULL,
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size,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_SHARED | MAP_ANONYMOUS,
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-1,
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0))) {
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VIXL_ASSERT(reinterpret_cast<intptr_t>(buffer_) != -1);
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memcpy(buffer_, code_start, size_);
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__builtin___clear_cache(buffer_, buffer_ + size_);
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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 Label& entry_point) const {
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uint32_t location = entry_point.GetLocation();
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if (entry_point.IsT32()) location += 1;
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return GetOffsetAddress<T>(location);
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}
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protected:
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template <typename T>
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T GetOffsetAddress(ptrdiff_t offset) const {
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VIXL_ASSERT((offset >= 0) && (offset <= size_));
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T function_address;
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byte* buffer_address = buffer_ + offset;
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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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private:
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size_t size_;
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byte* buffer_;
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};
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#endif
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// Generate a function with the following prototype:
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// int32_t abs(int32_t x)
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//
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// The generated function computes the absolute value of an integer.
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void GenerateAbs(MacroAssembler* masm);
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// Generate a function with the following prototype:
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// uint32_t demo_function(uint32_t x)
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//
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// This is the example used in doc/getting-started-a32.txt
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void GenerateDemo(MacroAssembler* masm);
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#endif /* !VIXL_EXAMPLE_EXAMPLES_H_ */
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