1 // Copyright 2016, 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 #include "aarch64/disasm-aarch64.h"
30 #include "aarch64/macro-assembler-aarch64.h"
31 #include "aarch64/simulator-aarch64.h"
32
33 using namespace vixl;
34 using namespace vixl::aarch64;
35
36 #ifdef VIXL_HAS_SIMULATED_RUNTIME_CALL_SUPPORT
37
38 #define __ masm->
39
add_int32s(int32_t a,int32_t b)40 int32_t add_int32s(int32_t a, int32_t b) {
41 printf("add_int32s(%d, %d)\n", a, b);
42 return a + b;
43 }
44
int32_to_float(int32_t value)45 float int32_to_float(int32_t value) {
46 printf("int32_to_float(%d)\n", value);
47 return static_cast<float>(value);
48 }
49
float_to_int32(float value)50 int32_t float_to_int32(float value) {
51 printf("float_to_int32(%f)\n", value);
52 return static_cast<int32_t>(value);
53 }
54
overload_function(float value)55 void overload_function(float value) {
56 printf("overload_function(float %f)\n", value);
57 }
58
overload_function(int32_t value)59 void overload_function(int32_t value) {
60 printf("overload_function(int32_t %d)\n", value);
61 }
62
GenerateRuntimeCallExamples(MacroAssembler * masm)63 void GenerateRuntimeCallExamples(MacroAssembler* masm) {
64 // Preserve lr, since the calls will overwrite it.
65 __ Push(xzr, lr);
66 // The arguments are expected in the appropriate registers (following the
67 // Aarch64 ABI).
68 __ CallRuntime(add_int32s);
69 // The result is in `w0`, as per the ABI.
70 // Of course, one can use assembly to work with the results.
71 __ Lsl(w0, w0, 2);
72 __ CallRuntime(int32_to_float);
73 // The result is in `s0`.
74 // `CallRuntime` can infer template arguments when the call is not ambiguous.
75 // Otherwise the template arguments must be specified in the form:
76 // `__ CallRuntime<return_type, parameter_type_0, parameter_type_1, ...>();`
77 __ CallRuntime<void, float>(overload_function);
78 __ CallRuntime(float_to_int32);
79 __ CallRuntime<void, int32_t>(overload_function);
80 // Restore lr and return.
81 __ Pop(lr, xzr);
82 __ Ret();
83 }
84
85
86 #ifndef TEST_EXAMPLES
87 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH64
88
main(void)89 int main(void) {
90 MacroAssembler masm;
91
92 // Generate the code for the example function.
93 Label call_runtime_add_floats;
94 masm.Bind(&call_runtime_add_floats);
95 GenerateRuntimeCallExamples(&masm);
96 masm.FinalizeCode();
97
98 Instruction* start =
99 masm.GetLabelAddress<Instruction*>(&call_runtime_add_floats);
100
101 // Disassemble the generated code.
102 PrintDisassembler disassembler(stdout);
103 disassembler.DisassembleBuffer(start, masm.GetSizeOfCodeGenerated());
104
105 Decoder decoder;
106 Simulator simulator(&decoder);
107
108 int32_t input_a = 1;
109 int32_t input_b = 2;
110 simulator.WriteWRegister(0, input_a);
111 simulator.WriteWRegister(1, input_b);
112 simulator.RunFrom(start);
113 printf("The final result is %d\n", simulator.ReadWRegister(0));
114
115 return 0;
116 }
117 #else
118 // TODO: Support running natively.
main(void)119 int main(void) { return 0; }
120 #endif // VIXL_INCLUDE_SIMULATOR_AARCH64
121 #endif // TEST_EXAMPLES
122 #else
123 #ifndef TEST_EXAMPLES
main(void)124 int main(void) { return 0; }
125 #endif // TEST_EXAMPLES
126 #endif // VIXL_HAS_SIMULATED_RUNTIME_CALL_SUPPORT
127