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      1 // Copyright 2015, 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 #ifndef VIXL_EXAMPLE_EXAMPLES_H_
     28 #define VIXL_EXAMPLE_EXAMPLES_H_
     29 
     30 extern "C" {
     31 #include <stdint.h>
     32 #ifndef VIXL_INCLUDE_SIMULATOR_AARCH32
     33 #include <sys/mman.h>
     34 #endif
     35 }
     36 
     37 #include <cstdio>
     38 #include <string>
     39 
     40 #include "aarch32/constants-aarch32.h"
     41 #include "aarch32/instructions-aarch32.h"
     42 #include "aarch32/macro-assembler-aarch32.h"
     43 
     44 using namespace vixl;
     45 using namespace vixl::aarch32;
     46 
     47 #ifndef VIXL_INCLUDE_SIMULATOR_AARCH32
     48 class ExecutableMemory {
     49  public:
     50   ExecutableMemory(const byte* code_start, size_t size)
     51       : size_(size),
     52         buffer_(reinterpret_cast<byte*>(mmap(NULL,
     53                                              size,
     54                                              PROT_READ | PROT_WRITE | PROT_EXEC,
     55                                              MAP_SHARED | MAP_ANONYMOUS,
     56                                              -1,
     57                                              0))) {
     58     VIXL_ASSERT(reinterpret_cast<intptr_t>(buffer_) != -1);
     59     memcpy(buffer_, code_start, size_);
     60     __builtin___clear_cache(buffer_, buffer_ + size_);
     61   }
     62   ~ExecutableMemory() { munmap(buffer_, size_); }
     63 
     64   template <typename T>
     65   T GetEntryPoint(const Label& entry_point, InstructionSet isa) const {
     66     int32_t location = entry_point.GetLocation();
     67     if (isa == T32) location += 1;
     68     return GetOffsetAddress<T>(location);
     69   }
     70 
     71  protected:
     72   template <typename T>
     73   T GetOffsetAddress(int32_t offset) const {
     74     VIXL_ASSERT((offset >= 0) && (static_cast<size_t>(offset) <= size_));
     75     T function_address;
     76     byte* buffer_address = buffer_ + offset;
     77     memcpy(&function_address, &buffer_address, sizeof(T));
     78     return function_address;
     79   }
     80 
     81  private:
     82   size_t size_;
     83   byte* buffer_;
     84 };
     85 #endif
     86 
     87 // Generate a function with the following prototype:
     88 //   int32_t abs(int32_t x)
     89 //
     90 // The generated function computes the absolute value of an integer.
     91 void GenerateAbs(MacroAssembler* masm);
     92 
     93 // Generate a function with the following prototype:
     94 //   uint32_t demo_function(uint32_t x)
     95 //
     96 // This is the example used in doc/getting-started-aarch32.md
     97 void GenerateDemo(MacroAssembler* masm);
     98 
     99 #endif  // VIXL_EXAMPLE_EXAMPLES_H_
    100