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
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
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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 using namespace vixl;
30 using namespace vixl::aarch64;
31
32 #define __ masm->
33
GenerateSwap4(MacroAssembler * masm)34 void GenerateSwap4(MacroAssembler* masm) {
35 // VIXL's macro assembler provides some functions to manipulate the stack.
36 // This example shows some of these functions.
37 __ Claim(16);
38 __ Poke(x0, 0);
39 __ Poke(x1, 8);
40 __ Push(x3, x2);
41
42 __ Pop(x1, x0);
43 __ Peek(x3, 0);
44 __ Peek(x2, 8);
45 __ Drop(16);
46
47 __ Ret();
48 }
49
50
51 #ifndef TEST_EXAMPLES
52 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
main(void)53 int main(void) {
54 MacroAssembler masm;
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.WriteXRegister(0, 0x1111111111111111);
66 simulator.WriteXRegister(1, 0x2222222222222222);
67 simulator.WriteXRegister(2, 0x3333333333333333);
68 simulator.WriteXRegister(3, 0x4444444444444444);
69
70 // clang-format off
71 printf("Before swap4:\n"
72 "x0 = 0x%" PRIx64 "\n"
73 "x1 = 0x%" PRIx64 "\n"
74 "x2 = 0x%" PRIx64 "\n"
75 "x3 = 0x%" PRIx64 "\n",
76 simulator.ReadXRegister(0), simulator.ReadXRegister(1),
77 simulator.ReadXRegister(2), simulator.ReadXRegister(3));
78 // clang-format on
79
80 simulator.RunFrom(masm.GetLabelAddress<Instruction*>(&swap4));
81
82 // clang-format off
83 printf("After swap4:\n"
84 "x0 = 0x%" PRIx64 "\n"
85 "x1 = 0x%" PRIx64 "\n"
86 "x2 = 0x%" PRIx64 "\n"
87 "x3 = 0x%" PRIx64 "\n",
88 simulator.ReadXRegister(0), simulator.ReadXRegister(1),
89 simulator.ReadXRegister(2), simulator.ReadXRegister(3));
90 // clang-format on
91
92 return 0;
93 }
94 #else
95 // Without the simulator there is nothing to test.
main(void)96 int main(void) { return 0; }
97 #endif // VIXL_INCLUDE_SIMULATOR_AARCH64
98 #endif // TEST_EXAMPLES
99