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
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
GenerateSwap4(MacroAssembler * masm)31 void 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
main(void)50 int 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.
main(void)93 int main(void) { return 0; }
94 #endif // VIXL_INCLUDE_SIMULATOR_AARCH64
95 #endif // TEST_EXAMPLES
96