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      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
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     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 
     31 void GenerateDemo(MacroAssembler* masm) {
     32   // uint32_t demo(uint32_t x)
     33 
     34   // Load a constant in r1 using the literal pool.
     35   __ Ldr(r1, 0x12345678);
     36   __ And(r0, r0, r1);
     37   __ Bx(lr);
     38 }
     39 
     40 
     41 #ifndef TEST_EXAMPLES
     42 int main() {
     43   MacroAssembler masm;
     44   // Generate the code for the example function.
     45   Label demo;
     46   // Tell the macro assembler that the label "demo" refer to the current
     47   // location in the buffer.
     48   masm.Bind(&demo);
     49   GenerateDemo(&masm);
     50   // Ensure that everything is generated and that the generated buffer is
     51   // ready to use.
     52   masm.FinalizeCode();
     53 #ifdef VIXL_INCLUDE_SIMULATOR_AARCH32
     54 // There is no simulator defined for VIXL AArch32.
     55 #else
     56   byte* code = masm.GetBuffer()->GetStartAddress<byte*>();
     57   uint32_t code_size = masm.GetSizeOfCodeGenerated();
     58   ExecutableMemory memory(code, code_size);
     59   // Run the example function.
     60   uint32_t (*demo_function)(uint32_t) =
     61       memory.GetEntryPoint<uint32_t (*)(uint32_t)>(demo);
     62   uint32_t input_value = 0x89abcdef;
     63   uint32_t output_value = (*demo_function)(input_value);
     64   printf("native: demo(0x%08x) = 0x%08x\n", input_value, output_value);
     65 #endif
     66   return 0;
     67 }
     68 #endif  // TEST_EXAMPLES
     69