1 // Copyright 2015, VIXL authors 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are met: 6 // 7 // * Redistributions of source code must retain the above copyright notice, 8 // this list of conditions and the following disclaimer. 9 // * Redistributions in binary form must reproduce the above copyright notice, 10 // this list of conditions and the following disclaimer in the documentation 11 // and/or other materials provided with the distribution. 12 // * Neither the name of ARM Limited nor the names of its contributors may be 13 // used to endorse or promote products derived from this software without 14 // specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND 17 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 20 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 27 #include "examples.h" 28 29 #define __ masm. 30 31 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64 32 int64_t LiteralExample(int64_t a, int64_t b) { 33 // Create and initialize the macro-assembler and the simulator. 34 MacroAssembler masm; 35 Decoder decoder; 36 Simulator simulator(&decoder); 37 38 Literal<int64_t> automatically_placed_literal(111, masm.GetLiteralPool()); 39 Literal<int64_t> manually_placed_literal(222); 40 41 // Generate some code. 42 Label start; 43 masm.Bind(&start); 44 { 45 ExactAssemblyScope scope(&masm, 46 kInstructionSize + sizeof(int64_t), 47 ExactAssemblyScope::kExactSize); 48 Label over_literal; 49 __ b(&over_literal); 50 __ place(&manually_placed_literal); 51 __ bind(&over_literal); 52 } 53 __ Ldr(x1, &manually_placed_literal); 54 __ Ldr(x2, &automatically_placed_literal); 55 __ Add(x0, x1, x2); 56 __ Ret(); 57 58 masm.FinalizeCode(); 59 60 // Usually, compilers will move the code to another place in memory before 61 // executing it. Emulate that. 62 size_t code_size = masm.GetSizeOfCodeGenerated(); 63 uint8_t* code = reinterpret_cast<uint8_t*>(malloc(code_size)); 64 if (code == NULL) { 65 return 1; 66 } 67 memcpy(code, masm.GetBuffer()->GetStartAddress<void*>(), code_size); 68 69 // Run the code. 70 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&start)); 71 printf("111 + 222 = %" PRId64 "\n", simulator.ReadXRegister(0)); 72 73 // Now let's modify the values of the literals. 74 automatically_placed_literal.UpdateValue(a, code); 75 manually_placed_literal.UpdateValue(b, code); 76 77 // Run the code again. 78 simulator.RunFrom(reinterpret_cast<Instruction*>(code)); 79 printf("%" PRId64 " + %" PRId64 " = %" PRId64 "\n", 80 a, 81 b, 82 simulator.ReadXRegister(0)); 83 84 return simulator.ReadXRegister(0); 85 } 86 #endif 87 88 #ifndef TEST_EXAMPLES 89 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64 90 int main(void) { 91 VIXL_CHECK(LiteralExample(1, 2) == 3); 92 return 0; 93 } 94 #else 95 // Without the simulator there is nothing to test. 96 int main(void) { return 0; } 97 #endif // VIXL_INCLUDE_SIMULATOR_AARCH64 98 #endif // TEST_EXAMPLES 99
