3c_disasm/disasm.cpp

   1 #include <boost/lexical_cast.hpp>
   2 #include <boost/dynamic_bitset.hpp>
   3 #include "disasm.h"
   4
   5 using namespace boost;
   6
   7 Iinstr* disasm::decode(std::string str)
   8 {
   9         /* we need 0x prefix */
  10         string hex = "0x";
  11         hex.append(str);
  12
  13         unsigned int val =  lexical_cast<uint32_from_hex>(hex);
  14
  15         dynamic_bitset<> bits(32,val), opcode(32,val), condition(9), args(32);
  16
  17         args = opcode;
  18         args.resize(23);
  19
  20         opcode >>= 23;
  21         condition = opcode;
  22         opcode.resize(5);
  23
  24         condition >>= 5;
  25         condition.resize(4);
  26
  27         //cout << "<" << hex << "> is in int  " << val << "\t is binary " << bits << " opcode?" << opcode << " condition " << condition << endl;
  28         try {
  29                 Iinstr* instr = decodeOpcode(opcode.to_ulong());
  30                 instr->decodeCondition(condition.to_ulong());
  31                 instr->loadBits(args);
  32                 instr->evalInstr();
  33                 return instr;
  34         }
  35         catch(std::string &e) {
  36                 cerr << " Error: " << e << endl;
  37         }
  38         return NULL;
  39 }
  40
  41 std::string disasm::decodeToString(std::string str)
  42 {
  43         return this->decode(str)->toString();
  44 }
  45
  46 Iinstr* disasm::decodeOpcode(short opcode)
  47 {
  48         auto iter = instrs.find(opcode);
  49         if(iter != instrs.end()) {
  50                 Iinstr* p = (iter->second)->getNew();
  51                 return p;
  52         }
  53         else {
  54                 stringstream err;
  55                 err << "opcode not found" << endl;
  56                 throw err.str();
  57         }
  58 }