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: ExecutableMemory(const byte * code_start,size_t size)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 } ~ExecutableMemory()62 ~ExecutableMemory() { munmap(buffer_, size_); } 63 64 template <typename T> GetEntryPoint(const Label & entry_point,InstructionSet isa)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> GetOffsetAddress(int32_t offset)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