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102 lines
3.6 KiB
102 lines
3.6 KiB
// 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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#include "examples.h"
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using namespace vixl;
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using namespace vixl::aarch64;
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#define __ masm.
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#ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
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int64_t LiteralExample(int64_t a, int64_t b) {
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// Create and initialize the macro-assembler and the simulator.
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MacroAssembler masm;
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Decoder decoder;
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Simulator simulator(&decoder);
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Literal<int64_t> automatically_placed_literal(111, masm.GetLiteralPool());
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Literal<int64_t> manually_placed_literal(222);
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// Generate some code.
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Label start;
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masm.Bind(&start);
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{
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ExactAssemblyScope scope(&masm,
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kInstructionSize + sizeof(int64_t),
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ExactAssemblyScope::kExactSize);
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Label over_literal;
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__ b(&over_literal);
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__ place(&manually_placed_literal);
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__ bind(&over_literal);
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}
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__ Ldr(x1, &manually_placed_literal);
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__ Ldr(x2, &automatically_placed_literal);
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__ Add(x0, x1, x2);
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__ Ret();
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masm.FinalizeCode();
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// Usually, compilers will move the code to another place in memory before
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// executing it. Emulate that.
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size_t code_size = masm.GetSizeOfCodeGenerated();
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uint8_t* code = reinterpret_cast<uint8_t*>(malloc(code_size));
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if (code == NULL) {
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return 1;
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}
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memcpy(code, masm.GetBuffer()->GetStartAddress<void*>(), code_size);
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// Run the code.
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simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&start));
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printf("111 + 222 = %" PRId64 "\n", simulator.ReadXRegister(0));
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// Now let's modify the values of the literals.
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automatically_placed_literal.UpdateValue(a, code);
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manually_placed_literal.UpdateValue(b, code);
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// Run the code again.
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simulator.RunFrom(reinterpret_cast<Instruction*>(code));
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printf("%" PRId64 " + %" PRId64 " = %" PRId64 "\n",
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a,
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b,
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simulator.ReadXRegister(0));
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return simulator.ReadXRegister(0);
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}
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#endif
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#ifndef TEST_EXAMPLES
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#ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
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int main(void) {
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VIXL_CHECK(LiteralExample(1, 2) == 3);
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return 0;
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}
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#else
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// Without the simulator there is nothing to test.
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int main(void) { return 0; }
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#endif // VIXL_INCLUDE_SIMULATOR_AARCH64
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#endif // TEST_EXAMPLES
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