1// Copyright 2014, 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
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25// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26
27#include "examples.h"
28
29#define __ masm->
30
31void GenerateSwap4(MacroAssembler* masm) {
32  // VIXL's macro assembler provides some functions to manipulate the stack.
33  // This example shows some of these functions.
34  __ Claim(16);
35  __ Poke(x0, 0);
36  __ Poke(x1, 8);
37  __ Push(x3, x2);
38
39  __ Pop(x1, x0);
40  __ Peek(x3, 0);
41  __ Peek(x2, 8);
42  __ Drop(16);
43
44  __ Ret();
45}
46
47
48#ifndef TEST_EXAMPLES
49#ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
50int main(void) {
51  MacroAssembler masm;
52  Decoder decoder;
53  Simulator simulator(&decoder);
54
55  // Generate the code for the example function.
56  Label swap4;
57  masm.Bind(&swap4);
58  GenerateSwap4(&masm);
59  masm.FinalizeCode();
60
61  // Run the example function.
62  simulator.WriteXRegister(0, 0x1111111111111111);
63  simulator.WriteXRegister(1, 0x2222222222222222);
64  simulator.WriteXRegister(2, 0x3333333333333333);
65  simulator.WriteXRegister(3, 0x4444444444444444);
66
67  // clang-format off
68  printf("Before swap4:\n"
69         "x0 = 0x%" PRIx64 "\n"
70         "x1 = 0x%" PRIx64 "\n"
71         "x2 = 0x%" PRIx64 "\n"
72         "x3 = 0x%" PRIx64 "\n",
73         simulator.ReadXRegister(0), simulator.ReadXRegister(1),
74         simulator.ReadXRegister(2), simulator.ReadXRegister(3));
75  // clang-format on
76
77  simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&swap4));
78
79  // clang-format off
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.ReadXRegister(0), simulator.ReadXRegister(1),
86         simulator.ReadXRegister(2), simulator.ReadXRegister(3));
87  // clang-format on
88
89  return 0;
90}
91#else
92// Without the simulator there is nothing to test.
93int main(void) { return 0; }
94#endif  // VIXL_INCLUDE_SIMULATOR_AARCH64
95#endif  // TEST_EXAMPLES
96