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26
27#include "examples.h"
28
29#define BUF_SIZE (4096)
30#define __ masm->
31
32void 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
51int 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.
92int main(void) { return 0; }
93#endif  // USE_SIMULATOR
94#endif  // TEST_EXAMPLES
95