Shamusworld >> Repos - virtualjaguar/blob - src/jagdasm.cpp

   1 //
   2 // Jaguar RISC Disassembly
   3 //
   4 // Originally by David Raingeard
   5 // GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Carwin Jones (BeOS)
   6 // Minor cleanups by James Hammons
   7 // (C) 2012 Underground Software
   8 //
   9 // JLH = James Hammons <jlhamm@acm.org>
  10 //
  11 // Who  When        What
  12 // ---  ----------  -------------------------------------------------------------
  13 // JLH  06/01/2012  Created this log (long overdue! ;-)
  14 // JLH  01/23/2013  Beautifying of disassembly, including hex digits of opcodes
  15 //                  and operands
  16 //
  17
  18 #include "jagdasm.h"
  19
  20 #include <stdio.h>
  21 #include "jaguar.h"
  22
  23 #define ROPCODE(a) JaguarReadWord(a)
  24
  25 uint8 convert_zero[32] =
  26 { 32,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31 };
  27
  28 const char * condition[32] =
  29 {
  30         "",
  31         "nz,",
  32         "z,",
  33         "???,",
  34         "nc,",
  35         "nc nz,",
  36         "nc z,",
  37         "???,",
  38
  39         "c,",
  40         "c nz,",
  41         "c z,",
  42         "???,",
  43         "???,",
  44         "???,",
  45         "???,",
  46         "???,",
  47
  48         "???,",
  49         "???,",
  50         "???,",
  51         "???,",
  52         "nn,",
  53         "nn nz,",
  54         "nn z,",
  55         "???,",
  56
  57         "n,",
  58         "n nz,",
  59         "n z,",
  60         "???,",
  61         "???,",
  62         "???,",
  63         "???,",
  64         "never,"
  65 };
  66
  67
  68
  69 char * signed_16bit(int16 val)
  70 {
  71         static char temp[10];
  72
  73         if (val < 0)
  74                 sprintf(temp, "-$%X", -val);
  75         else
  76                 sprintf(temp, "$%X", val);
  77
  78         return temp;
  79 }
  80
  81
  82 unsigned dasmjag(int dsp_type, char * bufferOut, unsigned pc)
  83 {
  84         char buffer[64];
  85         int op = ROPCODE(pc);
  86         int reg1 = (op >> 5) & 31;
  87         int reg2 = op & 31;
  88         int size = 2;
  89         pc += 2;
  90
  91         switch (op >> 10)
  92         {
  93                 case 0:         sprintf(buffer, "ADD     R%02d,R%02d", reg1, reg2);                             break;
  94                 case 1:         sprintf(buffer, "ADDC    R%02d,R%02d", reg1, reg2);                             break;
  95                 case 2:         sprintf(buffer, "ADDQ    $%X,R%02d", convert_zero[reg1], reg2); break;
  96                 case 3:         sprintf(buffer, "ADDQT   $%X,R%02d", convert_zero[reg1], reg2); break;
  97                 case 4:         sprintf(buffer, "SUB     R%02d,R%02d", reg1, reg2);                             break;
  98                 case 5:         sprintf(buffer, "SUBC    R%02d,R%02d", reg1, reg2);                             break;
  99                 case 6:         sprintf(buffer, "SUBQ    $%X,R%02d", convert_zero[reg1], reg2); break;
 100                 case 7:         sprintf(buffer, "SUBQT   $%X,R%02d", convert_zero[reg1], reg2); break;
 101                 case 8:         sprintf(buffer, "NEG     R%02d", reg2);                                                 break;
 102                 case 9:         sprintf(buffer, "AND     R%02d,R%02d", reg1, reg2);                             break;
 103                 case 10:        sprintf(buffer, "OR      R%02d,R%02d", reg1, reg2);                             break;
 104                 case 11:        sprintf(buffer, "XOR     R%02d,R%02d", reg1, reg2);                             break;
 105                 case 12:        sprintf(buffer, "NOT     R%02d", reg2);                                                 break;
 106                 case 13:        sprintf(buffer, "BTST    $%X,R%02d", reg1, reg2);                               break;
 107                 case 14:        sprintf(buffer, "BSET    $%X,R%02d", reg1, reg2);                               break;
 108                 case 15:        sprintf(buffer, "BCLR    $%X,R%02d", reg1, reg2);                               break;
 109                 case 16:        sprintf(buffer, "MULT    R%02d,R%02d", reg1, reg2);                             break;
 110                 case 17:        sprintf(buffer, "IMULT   R%02d,R%02d", reg1, reg2);                             break;
 111                 case 18:        sprintf(buffer, "IMULTN  R%02d,R%02d", reg1, reg2);                             break;
 112                 case 19:        sprintf(buffer, "RESMAC  R%02d", reg2);                                                 break;
 113                 case 20:        sprintf(buffer, "IMACN   R%02d,R%02d", reg1, reg2);                             break;
 114                 case 21:        sprintf(buffer, "DIV     R%02d,R%02d", reg1, reg2);                             break;
 115                 case 22:        sprintf(buffer, "ABS     R%02d", reg2);                                                 break;
 116                 case 23:        sprintf(buffer, "SH      R%02d,R%02d", reg1, reg2);                             break;
 117                 case 24:        sprintf(buffer, "SHLQ    $%X,R%02d", 32 - reg1, reg2);  break;
 118                 case 25:        sprintf(buffer, "SHRQ    $%X,R%02d", convert_zero[reg1], reg2); break;
 119                 case 26:        sprintf(buffer, "SHA     R%02d,R%02d", reg1, reg2);                             break;
 120                 case 27:        sprintf(buffer, "SHARQ   $%X,R%02d", convert_zero[reg1], reg2); break;
 121                 case 28:        sprintf(buffer, "ROR     R%02d,R%02d", reg1, reg2);                             break;
 122                 case 29:        sprintf(buffer, "RORQ    $%X,R%02d", convert_zero[reg1], reg2); break;
 123                 case 30:        sprintf(buffer, "CMP     R%02d,R%02d", reg1, reg2);                             break;
 124                 case 31:        sprintf(buffer, "CMPQ    %s,R%02d", signed_16bit((int16)(reg1 << 11) >> 11), reg2);break;
 125                 case 32:        if (dsp_type == JAGUAR_GPU)
 126                                                 sprintf(buffer, "SAT8    R%02d", reg2);
 127                                         else
 128                                                 sprintf(buffer, "SUBQMOD $%X,R%02d", convert_zero[reg1], reg2);
 129                                         break;
 130                 case 33:        if (dsp_type == JAGUAR_GPU)
 131                                                 sprintf(buffer, "SAT16   R%02d", reg2);
 132                                         else
 133                                                 sprintf(buffer, "SAT16S  R%02d", reg2);
 134                                         break;
 135                 case 34:        sprintf(buffer, "MOVE    R%02d,R%02d", reg1, reg2);                             break;
 136                 case 35:        sprintf(buffer, "MOVEQ   %d,R%02d", reg1, reg2);                                break;
 137                 case 36:        sprintf(buffer, "MOVETA  R%02d,R%02d", reg1, reg2);                             break;
 138                 case 37:        sprintf(buffer, "MOVEFA  R%02d,R%02d", reg1, reg2);                             break;
 139                 case 38:        sprintf(buffer, "MOVEI   #$%X,R%02d", ROPCODE(pc) | (ROPCODE(pc+2)<<16), reg2); size = 6; break;
 140                 case 39:        sprintf(buffer, "LOADB   (R%02d),R%02d", reg1, reg2);                   break;
 141                 case 40:        sprintf(buffer, "LOADW   (R%02d),R%02d", reg1, reg2);                   break;
 142                 case 41:        sprintf(buffer, "LOAD    (R%02d),R%02d", reg1, reg2);                   break;
 143                 case 42:        if (dsp_type == JAGUAR_GPU)
 144                                                 sprintf(buffer, "LOADP   (R%02d),R%02d", reg1, reg2);
 145                                         else
 146                                                 sprintf(buffer, "SAT32S  R%02d", reg2);
 147                                         break;
 148                 case 43:        sprintf(buffer, "LOAD    (R14+$%X),R%02d", convert_zero[reg1]*4, reg2);break;
 149                 case 44:        sprintf(buffer, "LOAD    (R15+$%X),R%02d", convert_zero[reg1]*4, reg2);break;
 150                 case 45:        sprintf(buffer, "STOREB  R%02d,(R%02d)", reg2, reg1);                   break;
 151                 case 46:        sprintf(buffer, "STOREW  R%02d,(R%02d)", reg2, reg1);                   break;
 152                 case 47:        sprintf(buffer, "STORE   R%02d,(R%02d)", reg2, reg1);                   break;
 153                 case 48:        if (dsp_type == JAGUAR_GPU)
 154                                                 sprintf(buffer, "STOREP  R%02d,(R%02d)", reg2, reg1);
 155                                         else
 156                                                 sprintf(buffer, "MIRROR  R%02d", reg2);
 157                                         break;
 158                 case 49:        sprintf(buffer, "STORE   R%02d,(R14+$%X)", reg2, convert_zero[reg1]*4);break;
 159                 case 50:        sprintf(buffer, "STORE   R%02d,(R15+$%X)", reg2, convert_zero[reg1]*4);break;
 160                 case 51:        sprintf(buffer, "MOVE    PC,R%02d", reg2);                                              break;
 161                 case 52:        sprintf(buffer, "JUMP    %s(R%02d)", condition[reg2], reg1);    break;
 162                 case 53:        sprintf(buffer, "JR      %s$%X", condition[reg2], pc + ((int8)(reg1 << 3) >> 2)); break;
 163                 case 54:        sprintf(buffer, "MMULT   R%02d,R%02d", reg1, reg2);                             break;
 164                 case 55:        sprintf(buffer, "MTOI    R%02d,R%02d", reg1, reg2);                             break;
 165                 case 56:        sprintf(buffer, "NORMI   R%02d,R%02d", reg1, reg2);                             break;
 166                 case 57:        sprintf(buffer, "NOP");                                                                                 break;
 167                 case 58:        sprintf(buffer, "LOAD    (R14+R%02d),R%02d", reg1, reg2);               break;
 168                 case 59:        sprintf(buffer, "LOAD    (R15+R%02d),R%02d", reg1, reg2);               break;
 169                 case 60:        sprintf(buffer, "STORE   R%02d,(R14+R%02d)", reg2, reg1);               break;
 170                 case 61:        sprintf(buffer, "STORE   R%02d,(R15+R%02d)", reg2, reg1);               break;
 171                 case 62:        if (dsp_type == JAGUAR_GPU)
 172                                                 sprintf(buffer, "SAT24   R%02d", reg2);
 173                                         else
 174                                                 sprintf(buffer, "illegal [%d,%d]", reg1, reg2);
 175                                         break;
 176                 case 63:        if (dsp_type == JAGUAR_GPU)
 177                                                 sprintf(buffer, (reg1 ? "UNPACK  R%02d" : "PACK    R%02d"), reg2);
 178                                         else
 179                                                 sprintf(buffer, "ADDQMOD $%X,R%02d", convert_zero[reg1], reg2);
 180                                         break;
 181         }
 182
 183 #if 0
 184         sprintf(bufferOut,"%-24s (%04X)", buffer, op);
 185 #else
 186         if (size == 2)
 187                 sprintf(bufferOut, "%04X            %-24s", op, buffer);
 188         else
 189         {
 190                 uint16 word1 = ROPCODE(pc), word2 = ROPCODE(pc + 2);
 191                 sprintf(bufferOut, "%04X %04X %04X  %-24s", op, word1, word2, buffer);
 192         }
 193 #endif
 194
 195         return size;
 196 }