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         CDat val =  lexical_cast<uint32_from_hex>(hex);
  14         return this->decodeNum(val);
  15 }
  16
  17
  18 Iinstr* disasm::decodeNum(CDat val)
  19 {
  20         dynamic_bitset<> bits(32,val), opcode(32,val), condition(9), args(32);
  21
  22         args = opcode;
  23         args.resize(23);
  24
  25         opcode >>= 23;
  26         condition = opcode;
  27         opcode.resize(5);
  28
  29         condition >>= 5;
  30         condition.resize(4);
  31
  32         //cout << "<" << hex << "> is in int  " << val << "\t is binary " << bits << " opcode?" << opcode << " condition " << condition << endl;
  33         try {
  34                 Iinstr* instr = decodeOpcode(opcode.to_ulong());
  35                 instr->decodeCondition(condition.to_ulong());
  36                 instr->loadBits(args);
  37                 instr->evalInstr();
  38                 return instr;
  39         }
  40         catch(std::string &e) {
  41                 cerr << " Error: " << e << endl;
  42         }
  43         return NULL;
  44 }
  45
  46 std::string disasm::decodeToString(std::string str)
  47 {
  48         return this->decode(str)->toString();
  49 }
  50
  51 Iinstr* disasm::decodeOpcode(short opcode)
  52 {
  53         auto iter = instrs.find(opcode);
  54         if(iter != instrs.end()) {
  55                 Iinstr* p = (iter->second)->getNew();
  56                 return p;
  57         }
  58         else {
  59                 stringstream err;
  60                 err << "opcode not found. in was " << opcode  << endl;
  61                 throw err.str();
  62         }
  63 }