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