1 // Copyright 2014, ARM Limited 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 BUF_SIZE (4096) 30 #define __ masm-> 31 32 void GenerateSwap4(MacroAssembler* masm) { 33 // VIXL's macro assembler provides some functions to manipulate the stack. 34 // This example shows some of these functions. 35 __ Claim(16); 36 __ Poke(x0, 0); 37 __ Poke(x1, 8); 38 __ Push(x3, x2); 39 40 __ Pop(x1, x0); 41 __ Peek(x3, 0); 42 __ Peek(x2, 8); 43 __ Drop(16); 44 45 __ Ret(); 46 } 47 48 49 #ifndef TEST_EXAMPLES 50 #ifdef USE_SIMULATOR 51 int main(void) { 52 // Create and initialize the assembler and the simulator. 53 byte assm_buf[BUF_SIZE]; 54 MacroAssembler masm(assm_buf, BUF_SIZE); 55 Decoder decoder; 56 Simulator simulator(&decoder); 57 58 // Generate the code for the example function. 59 Label swap4; 60 masm.Bind(&swap4); 61 GenerateSwap4(&masm); 62 masm.FinalizeCode(); 63 64 // Run the example function. 65 simulator.set_xreg(0, 0x1111111111111111); 66 simulator.set_xreg(1, 0x2222222222222222); 67 simulator.set_xreg(2, 0x3333333333333333); 68 simulator.set_xreg(3, 0x4444444444444444); 69 70 printf("Before swap4:\n" 71 "x0 = 0x%" PRIx64 "\n" 72 "x1 = 0x%" PRIx64 "\n" 73 "x2 = 0x%" PRIx64 "\n" 74 "x3 = 0x%" PRIx64 "\n", 75 simulator.xreg(0), simulator.xreg(1), 76 simulator.xreg(2), simulator.xreg(3)); 77 78 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&swap4)); 79 80 printf("After swap4:\n" 81 "x0 = 0x%" PRIx64 "\n" 82 "x1 = 0x%" PRIx64 "\n" 83 "x2 = 0x%" PRIx64 "\n" 84 "x3 = 0x%" PRIx64 "\n", 85 simulator.xreg(0), simulator.xreg(1), 86 simulator.xreg(2), simulator.xreg(3)); 87 88 return 0; 89 } 90 #else 91 // Without the simulator there is nothing to test. 92 int main(void) { return 0; } 93 #endif // USE_SIMULATOR 94 #endif // TEST_EXAMPLES 95
