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
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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 BUF_SIZE (4096)
30 #define __ masm->
31
GenerateSwap4(MacroAssembler * masm)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
main(void)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.
main(void)92 int main(void) { return 0; }
93 #endif // USE_SIMULATOR
94 #endif // TEST_EXAMPLES
95