| 1 |
/* |
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* mon_m68k.cpp - 68k disassembler |
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* |
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* mon (C) 1997-2000 Christian Bauer, Marc Hellwig |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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/* |
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* TODO |
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* - add missing f-lines |
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* - MULx.L/DIVx.L |
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* - use tab instead of spaces |
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*/ |
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|
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#include "sysdeps.h" |
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|
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#include <stdlib.h> |
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|
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#include "mon.h" |
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#include "mon_68k.h" |
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#include "mon_atraps.h" |
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|
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enum t_size {BYTE, WORD, LONG, NOSIZE, BYTE_SILENT, WORD_SILENT, LONG_SILENT}; // "silent" means "don't append size qualifier to opcode" |
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enum t_errors {ER_UNKNOWN_ADDRESS_MODE, ER_UNKNOWN_OPCODE, ER_ILLEGAL_OPCODE}; |
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enum t_address {AD_C=1000, AD_BRANCH, AD_MULT, AD_DATA, AD_DATA_IMM, AD_CACHE}; |
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|
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static void error(t_errors code); |
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static int8 read_int8(void); |
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static uint16 read_uint16(void); |
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static int16 read_int16(void); |
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static int32 read_int32(void); |
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static void parse (); |
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static void add_int32_str (char *old,int32 value); |
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static void add_int16_str (char *old,int16 value); |
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static void add_int8_str (char *old,int8 value); |
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static void add_dec_int_str (char *old,int32 value); |
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static void print_range (int from,int to); |
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static int decode_address_mode (uint16 eee,uint16 aaa,t_size size); |
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static void diss (char *ndest,uint16 *nmem,int &npos,unsigned int adr); |
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|
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enum t_control {C_UNKNOWN,C_SR,C_CCR,C_SFC,C_DFC,C_CACR,C_TC,C_ITT0,C_ITT1,C_DTT0,C_DTT1,C_BUSCR,C_USP,C_VBR,C_CAAR,C_MSP,C_ISP,C_MMUSR,C_URP,C_SRP,C_PCR}; |
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static char *con_str[]={"???","sr","ccr","sfc","dfc","cacr","tc","itt0","itt1","dtt0","dtt1","buscr","usp","vbr","caar","msp","isp","mmusr","urp","srp","pcr"}; |
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static char *cc_str[]= {"t","f","hi","ls","cc","cs","ne","eq","vc","vs","pl", |
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"mi","ge","lt","gt","le","ra","sr"}; |
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static uint16 opcode; |
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static uint16 source_eee; |
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static uint16 source_aaa; |
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static uint16 dest_eee; |
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static uint16 dest_aaa; |
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static int32 data_val; |
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static uint16 mask; // for movem !!! aaarrrggglll ... |
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static t_size size; |
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static int count_param; |
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static uint16 *mem; |
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static int mem_pos; |
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static char *dest; |
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static char op_name[50]; |
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static unsigned int adr_off; |
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|
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static void error (t_errors code) { |
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switch (code) { |
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case ER_UNKNOWN_ADDRESS_MODE: |
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printf ("unknown address mode\n"); |
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break; |
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case ER_UNKNOWN_OPCODE: |
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printf ("unknown opcode\n"); |
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break; |
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case ER_ILLEGAL_OPCODE: |
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printf ("illegal opcode\n"); |
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break; |
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default: |
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printf ("general error\n"); |
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} |
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} |
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|
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static int8 read_int8(void) { |
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return mem[mem_pos++]; |
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} |
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|
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static uint16 read_uint16(void) { |
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return mem[mem_pos++]; |
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} |
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|
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static int16 read_int16(void) { |
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return (int16)(mem[mem_pos++]); |
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} |
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|
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static int32 read_int32(void) { |
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int32 val = (mem[mem_pos] << 16) | mem[mem_pos+1]; |
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mem_pos+=2; |
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return val; |
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} |
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|
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// opcode table |
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#define def_param(n,c,s,se,sa,de,da) \ |
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strcpy(op_name,n);\ |
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count_param=c;\ |
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size=s;\ |
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source_eee=se;\ |
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source_aaa=sa;\ |
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dest_eee=de;\ |
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dest_aaa=da; |
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#define no_param(n) \ |
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def_param(n,0,NOSIZE,0,0,0,0) |
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#define bits(pos,count) ((opcode >> pos)&((1<<count)-1)) |
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#define mshort(s) \ |
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if (bits(6,3)==1) \ |
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{def_param("movea",2,s,bits(3,3),bits(0,3),1,bits(9,3))}\ |
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else\ |
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{def_param("move",2,s,bits(3,3),bits(0,3),bits(6,3),bits(9,3))} |
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#define imshort(n) \ |
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if (bits(6,2)<2) data_val = read_int16(); else data_val = read_int32();\ |
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def_param(n,2,(t_size)bits(6,2),AD_DATA_IMM,0,bits(3,3),bits(0,3)) |
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#define imshortcs(n) \ |
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switch (bits(0,8)) { \ |
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case 0x3c: \ |
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data_val = read_int16();\ |
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def_param(n,2,BYTE_SILENT,AD_DATA_IMM,0,AD_C,C_CCR) break; \ |
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case 0x7c: \ |
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data_val = read_int16();\ |
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def_param(n,2,WORD_SILENT,AD_DATA_IMM,0,AD_C,C_SR) break; \ |
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break; \ |
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default: \ |
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imshort(n) \ |
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break;\ |
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} |
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#define addshort(n) \ |
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if (bits(8,1)==0)\ |
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{def_param(n,2,(t_size)bits(6,2),bits(3,3),bits(0,3),0,bits(9,3))}\ |
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else\ |
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{def_param(n,2,(t_size)bits(6,2),0,bits(9,3),bits(3,3),bits(0,3))} |
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#define addxshort(n) \ |
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if (bits(3,1)==0) {\ |
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def_param(n,2,(t_size)bits(6,2),0,bits(0,3),0,bits(9,3))\ |
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} else {\ |
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def_param(n,2,(t_size)bits(6,2),4,bits(0,3),4,bits(9,3))\ |
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} |
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#define addashort(n) \ |
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def_param(n,2,NOSIZE,bits(3,3),bits(0,3),1,bits(9,3))\ |
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if (bits(8,1)==0) size=WORD; else size=LONG; |
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#define deashort(n) \ |
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def_param(n,2,(t_size)bits(6,2),0,bits(9,3),bits(3,3),bits(0,3)) |
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#define bitshort(n) \ |
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def_param(n,2,BYTE_SILENT,AD_DATA_IMM,0,bits(3,3),bits(0,3))\ |
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data_val=read_int8(); |
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#define bitdynshort(n) \ |
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def_param(n,2,BYTE_SILENT,0,bits(9,3),bits(3,3),bits(0,3)) |
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#define prwshort(n) \ |
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if (((op2 >> 9) & 1)==1) \ |
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{def_param(n,2,LONG,AD_C,C_UNKNOWN,bits(3,3),bits(0,3))}\ |
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else\ |
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{def_param(n,2,LONG,bits(3,3),bits(0,3),AD_C,C_UNKNOWN)} |
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#define mshiftshort(n) \ |
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def_param(n,1,WORD,bits(3,3),bits(0,3),0,0)\ |
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if (bits(8,1)==0) {\ |
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strcat(op_name,"r");\ |
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} else {\ |
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strcat(op_name,"l");\ |
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} |
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#define rshiftshort(n) \ |
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if (bits(5,1)==0) {\ |
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data_val=bits(9,3);\ |
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if (data_val==0) data_val=8;\ |
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def_param(n,2,(t_size)bits(6,2),AD_DATA_IMM,0,0,bits(0,3))\ |
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} else {\ |
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def_param(n,2,(t_size)bits(6,2),0,bits(9,3) % 64,0,bits(0,3))\ |
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}\ |
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if (bits(8,1)==0) {\ |
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strcat(op_name,"r");\ |
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} else {\ |
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strcat(op_name,"l");\ |
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} |
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#define abcdshort(n) \ |
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if (bits(3,1)==0) {\ |
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def_param(n,2,BYTE,0,bits(0,3),0,bits(9,3))\ |
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} else {\ |
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def_param(n,2,BYTE,4,bits(0,3),4,bits(9,3))\ |
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} |
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#define cinvpush(n) \ |
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def_param(n,bits(3,2) == 3 ? 1 : 2,NOSIZE,AD_CACHE,bits(6,2),2,bits(0,3))\ |
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switch (bits(3,2)) {\ |
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case 1: strcat(op_name, "l"); break;\ |
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case 2: strcat(op_name, "p"); break;\ |
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case 3: strcat(op_name, "a"); count_param = 1;\ |
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} |
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|
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static void parse () { |
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switch (bits(12,4)) { |
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case 0: // Bit Manipulation/MOVEP/Immediate |
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if (bits(8,1)==0) { // Immediate + Bit Manipulation static |
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if (bits(6,2)==3) { // RTM, CALLM, CMP2, CHK2, BSET, CAS2, CAS |
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switch (bits(9,3)) { |
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case 3: // RTM, CALLM |
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break; |
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case 0: case 1: case 2: // CMP2, CHK2 |
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break; |
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case 4: // BSET ! |
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bitshort("bset") break; |
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default: // CAS2, CAS |
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break; |
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} |
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} else { |
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switch (bits(9,3)) { |
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case 0: // ORI |
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imshortcs("ori") break; |
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case 1: // ANDI |
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imshortcs("andi") break; |
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case 2: // SUBI |
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imshort("subi") break; |
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case 3: // ADDI |
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imshort("addi") break; |
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case 4: // BTST, BCHG, BCLR static |
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switch (bits(6,2)) { |
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case 0: // BTST |
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bitshort("btst") break; |
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case 1: // BCHG |
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bitshort("bchg") break; |
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case 2: // BCLR |
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bitshort ("bclr") break; |
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} |
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break; |
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case 5: // EORI |
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imshortcs("eori"); break; |
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case 6: // CMPI |
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imshort("cmpi"); break; |
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case 7: // MOVES |
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break; |
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} |
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} |
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} else { // Bit Manipulation dynamic, MOVEP |
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if (bits(3,3)==1) { // MOVEP |
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if (bits(7,1)==0) { // MOVEP d(Ay),Dx |
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def_param("movep",2,NOSIZE,5,bits(0,3),0,bits(9,3)) |
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} else { // MOVEP Dx,d(Ay) |
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def_param("movep",2,NOSIZE,0,bits(9,3),5,bits(0,3)) |
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} |
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if (bits(6,1)==0) size=WORD; else size=LONG; |
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} else { // Bit Manipulation |
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switch (bits(6,2)) { |
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case 0: // BTST |
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bitdynshort("btst") break; |
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case 1: // BCHG |
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bitdynshort("bchg") break; |
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case 2: // BCLR |
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bitdynshort ("bclr") break; |
| 259 |
case 3: // BSET |
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bitdynshort ("bset") break; |
| 261 |
} |
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} |
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} |
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break; |
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case 1: // Move Byte |
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mshort(BYTE) |
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break; |
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case 2: // Move Long |
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mshort(LONG) |
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break; |
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case 3: // Move Word |
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mshort(WORD) |
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break; |
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case 4: // Miscellaneous |
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switch (bits(0,12)) { // First all fixed opcodes ... |
| 276 |
case 0xcfa: // BGND |
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no_param("bgnd") |
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break; |
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case 0xafc: // ILLEGAL |
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no_param("illegal") |
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break; |
| 282 |
case 0xe70: // RESET |
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no_param("reset") |
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break; |
| 285 |
case 0xe71: // NOP |
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no_param("nop") |
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break; |
| 288 |
case 0xe72: // STOP |
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data_val=read_int16(); |
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def_param("stop",1,WORD_SILENT,AD_DATA_IMM,0,0,0) break; |
| 291 |
case 0xe73: // RTE |
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no_param("rte") |
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break; |
| 294 |
case 0xe74: // RTD |
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data_val=read_int16(); |
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def_param("rtd",1,WORD_SILENT,AD_DATA,0,0,0) break; |
| 297 |
case 0xe75: // RTS |
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no_param("rts") |
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break; |
| 300 |
case 0xe76: // TRAPV |
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no_param("trapv") |
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break; |
| 303 |
case 0xe77: // RTR |
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no_param("rtr") |
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break; |
| 306 |
case 0xe7a: case 0xe7b: { // MOVEC |
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uint16 op2 = read_uint16(); |
| 308 |
uint16 val; |
| 309 |
switch (op2 & 0xfff) { |
| 310 |
case 0: val=C_SFC; break; |
| 311 |
case 1: val=C_DFC; break; |
| 312 |
case 2: val=C_CACR; break; |
| 313 |
case 3: val=C_TC; break; |
| 314 |
case 4: val=C_ITT0; break; |
| 315 |
case 5: val=C_ITT1; break; |
| 316 |
case 6: val=C_DTT0; break; |
| 317 |
case 7: val=C_DTT1; break; |
| 318 |
case 8: val=C_BUSCR; break; |
| 319 |
case 0x800: val=C_USP; break; |
| 320 |
case 0x801: val=C_VBR; break; |
| 321 |
case 0x802: val=C_CAAR; break; |
| 322 |
case 0x803: val=C_MSP; break; |
| 323 |
case 0x804: val=C_ISP; break; |
| 324 |
case 0x805: val=C_MMUSR; break; |
| 325 |
case 0x806: val=C_URP; break; |
| 326 |
case 0x807: val=C_SRP; break; |
| 327 |
case 0x808: val=C_PCR; break; |
| 328 |
default: val=C_UNKNOWN; break; // ERROR unknown control_reg |
| 329 |
} |
| 330 |
if (bits(0,1)==0) { // MOVEC Ctrl,AD |
| 331 |
def_param("movec",2,NOSIZE,AD_C,val,((op2 >> 15) & 1),((op2 >> 12) & 7)) |
| 332 |
} else { // MOVEC AD,Ctrl |
| 333 |
def_param("movec",2,NOSIZE,((op2 >> 15) & 1),((op2 >> 12) & 7),AD_C,val) |
| 334 |
} |
| 335 |
break; |
| 336 |
} |
| 337 |
default: |
| 338 |
switch (bits(3,9)) { |
| 339 |
case 0x110: case 0x118: // EXT maybe more ??? nicht ganz sauber |
| 340 |
def_param("ext",1,((bits(6,2)==2) ? WORD : LONG),0,bits(0,3),0,0) break; |
| 341 |
case 0x101: // LINK |
| 342 |
data_val=read_int32(); |
| 343 |
def_param("link",2,LONG,1,bits(0,3),AD_DATA_IMM,0) break; |
| 344 |
case 0x108: // SWAP |
| 345 |
def_param("swap",1,NOSIZE,0,bits(0,3),0,0) break; |
| 346 |
case 0x109: // BKPT |
| 347 |
data_val=bits(0,3); |
| 348 |
def_param("bkpt",1,BYTE,AD_DATA,0,0,0) break; |
| 349 |
case 0x1c8: case 0x1c9: // TRAP |
| 350 |
data_val=bits(0,4); |
| 351 |
def_param("trap",1,BYTE,AD_DATA,0,0,0) break; |
| 352 |
case 0x1ca: // LINK |
| 353 |
data_val=read_int16(); |
| 354 |
def_param("link",2,WORD_SILENT,1,bits(0,3),AD_DATA_IMM,0) break; |
| 355 |
case 0x1cb: // UNLK |
| 356 |
def_param("unlk",1,NOSIZE,1,bits(0,3),0,0) break; |
| 357 |
case 0x1cc: case 0x1cd: // MOVE USP |
| 358 |
if (bits(3,1)==0) { // MOVE An,USP |
| 359 |
def_param("move",2,LONG,1,bits(0,3),AD_C,C_USP) |
| 360 |
} else { // MOVE USP,An |
| 361 |
def_param("move",2,LONG,AD_C,C_USP,1,bits(0,3)) |
| 362 |
} |
| 363 |
break; |
| 364 |
default: |
| 365 |
switch (bits(6,6)) { |
| 366 |
case 3: // MOVE from SR |
| 367 |
def_param("move",2,WORD_SILENT,AD_C,C_SR,bits(3,3),bits(0,3)) break; |
| 368 |
case 0xb: // MOVE from CCR |
| 369 |
def_param("move",2,WORD_SILENT,AD_C,C_CCR,bits(3,3),bits(0,3)) break; |
| 370 |
case 0: case 1: case 2: // NEGX |
| 371 |
def_param("negx",1,(t_size)bits(6,2),bits(3,3),bits(0,3),0,0) break; |
| 372 |
case 8: case 9: case 0xa: // CLR |
| 373 |
def_param("clr",1,(t_size)bits(6,2),bits(3,3),bits(0,3),0,0) break; |
| 374 |
case 0x13: // MOVE to CCR |
| 375 |
def_param("move",2,WORD_SILENT,bits(3,3),bits(0,3),AD_C,C_CCR) break; |
| 376 |
case 0x10: case 0x11: case 0x12:// NEG |
| 377 |
def_param("neg",1,(t_size)bits(6,2),bits(3,3),bits(0,3),0,0) break; |
| 378 |
case 0x18: case 0x19: case 0x1a:// NOT |
| 379 |
def_param("not",1,(t_size)bits(6,2),bits(3,3),bits(0,3),0,0) break; |
| 380 |
case 0x1b: // MOVE to SR |
| 381 |
def_param("move",2,WORD_SILENT,bits(3,3),bits(0,3),AD_C,C_SR) break; |
| 382 |
case 0x20: // NBCD |
| 383 |
def_param("nbcd",1,BYTE,bits(3,3),bits(0,3),0,0) break; |
| 384 |
case 0x21: // PEA |
| 385 |
def_param("pea",1,LONG,bits(3,3),bits(0,3),0,0) break; |
| 386 |
case 0x2b: // TAS |
| 387 |
def_param("tas",1,BYTE,bits(3,3),bits(0,3),0,0) break; |
| 388 |
case 0x28: case 0x29: case 0x2a:// TST |
| 389 |
def_param("tst",1,(t_size)bits(6,2),bits(3,3),bits(0,3),0,0) break; |
| 390 |
case 0x30: // MULU, MULS, DIVU, DIVUL |
| 391 |
//!! |
| 392 |
break; |
| 393 |
case 0x31: // DIVS, DIVSL |
| 394 |
//!! |
| 395 |
break; |
| 396 |
case 0x3a: // JSR |
| 397 |
def_param("jsr ",1,NOSIZE,bits(3,3),bits(0,3),0,0) break; |
| 398 |
case 0x3b: // JMP |
| 399 |
def_param("jmp ",1,NOSIZE,bits(3,3),bits(0,3),0,0) break; |
| 400 |
case 0x22: case 0x23: case 0x32: case 0x33:// MOVEM |
| 401 |
mask=read_uint16(); |
| 402 |
if (bits(10,1)!=0) |
| 403 |
{def_param("movem",2,NOSIZE,bits(3,3),bits(0,3),AD_MULT,0)} |
| 404 |
else |
| 405 |
{def_param("movem",2,NOSIZE,AD_MULT,((bits(3,3)==4) ? 1 : 0),bits(3,3),bits(0,3))} |
| 406 |
if (bits(6,1)==0) size=WORD; else size=LONG; |
| 407 |
break; |
| 408 |
default: |
| 409 |
switch (bits(6,3)) { |
| 410 |
case 7: // LEA |
| 411 |
def_param("lea",2,NOSIZE,bits(3,3),bits(0,3),1,bits(9,3)) break; |
| 412 |
case 0: case 2: case 4: case 6:// CHK -> possible error ! check ! |
| 413 |
def_param("chk",2,WORD,bits(3,3),bits(0,3),0,bits(9,3)) break; |
| 414 |
default: // ERROR unknown opcode |
| 415 |
break; |
| 416 |
} |
| 417 |
} |
| 418 |
} |
| 419 |
} |
| 420 |
break; |
| 421 |
case 5: // ADDQ/SUBQ/Scc/DBcc/TRAPcc |
| 422 |
if (bits(6,2)==3) { // DBcc/TRAPcc/Scc |
| 423 |
switch (bits(3,3)) { |
| 424 |
case 1: // DBcc |
| 425 |
def_param("db",2,WORD_SILENT,0,bits(0,3),AD_BRANCH,bits(8,4)) |
| 426 |
break; |
| 427 |
case 7: // TRAPcc |
| 428 |
// not yet implemented |
| 429 |
break; |
| 430 |
default: // Scc |
| 431 |
def_param("s",1,BYTE,bits(3,3),bits(0,3),AD_BRANCH,bits(8,4)) |
| 432 |
} |
| 433 |
} else { // ADDQ/SUBQ |
| 434 |
if (bits(8,1)==0) { // ADDQ |
| 435 |
data_val=bits(9,3); |
| 436 |
def_param("addq",2,(t_size)bits(6,2),AD_DATA_IMM,0,bits(3,3),bits(0,3)) |
| 437 |
} else { // SUBQ |
| 438 |
data_val=bits(9,3); |
| 439 |
def_param("subq",2,(t_size)bits(6,2),AD_DATA_IMM,0,bits(3,3),bits(0,3)) |
| 440 |
} |
| 441 |
} |
| 442 |
break; |
| 443 |
case 6: // Bcc/BSR/BRA |
| 444 |
def_param("b",1,NOSIZE,AD_BRANCH,bits(0,8),AD_BRANCH,bits(8,4)) |
| 445 |
if (dest_aaa < 2) dest_aaa += 16; //Bcc -> BSR,BRA |
| 446 |
switch (bits(0,8)) { |
| 447 |
case 0: size = WORD; break; |
| 448 |
case 0xff: size = LONG; break; |
| 449 |
default: size = BYTE; |
| 450 |
} |
| 451 |
break; |
| 452 |
case 7: // MOVEQ |
| 453 |
data_val=bits(0,8); |
| 454 |
def_param("moveq",2,BYTE_SILENT,AD_DATA_IMM,0,0,bits(9,3)) |
| 455 |
break; |
| 456 |
case 8: // OR/DIV/SBCD |
| 457 |
switch (bits(4,5)) { |
| 458 |
case 0x10: // SBCD |
| 459 |
abcdshort("sbcd") break; |
| 460 |
case 0x14: // PACK |
| 461 |
break; |
| 462 |
case 0x18: // UNPK |
| 463 |
break; |
| 464 |
default: |
| 465 |
switch (bits(6,3)) { |
| 466 |
case 3: // DIVU/DIVUL |
| 467 |
def_param("divu",2,WORD,bits(3,3),bits(0,3),0,bits(9,3)) break; |
| 468 |
case 7: // DIVS/DIVSL |
| 469 |
def_param("divs",2,WORD,bits(3,3),bits(0,3),0,bits(9,3)) break; |
| 470 |
default: // OR |
| 471 |
addshort("or") |
| 472 |
break; |
| 473 |
} |
| 474 |
} |
| 475 |
break; |
| 476 |
case 9: // SUB/SUBX |
| 477 |
if (bits(6,2)==3) { // SUBA |
| 478 |
addashort("suba") |
| 479 |
} else { |
| 480 |
if ((bits(4,2)==0)&&(bits(8,1)==1)) {// SUBX |
| 481 |
addxshort("subx") |
| 482 |
} else { // SUB |
| 483 |
addshort("sub") |
| 484 |
} |
| 485 |
} |
| 486 |
break; |
| 487 |
case 0xa: { // (Unassigned, Reserved) |
| 488 |
int position = 0; |
| 489 |
no_param("a-line") |
| 490 |
while (atraps[position].word!=0) { |
| 491 |
if (atraps[position].word == opcode) { |
| 492 |
no_param(atraps[position].name) |
| 493 |
break; |
| 494 |
} |
| 495 |
position++; |
| 496 |
} |
| 497 |
break; |
| 498 |
} |
| 499 |
case 0xb: // CMP/EOR |
| 500 |
if (bits(6,2)==3) { // CMPA |
| 501 |
def_param("cmpa",2,((bits(8,1)==0) ? WORD : LONG),bits(3,3),bits(0,3),1,bits(9,3)) |
| 502 |
} else { |
| 503 |
if (bits(8,1)==1) { // CMPM/EOR |
| 504 |
if (bits(3,3)==1) { // CMPM |
| 505 |
def_param("cmpm",2,(t_size)bits(6,2),3,bits(0,3),3,bits(9,3)) |
| 506 |
} else { // EOR |
| 507 |
deashort("eor") |
| 508 |
} |
| 509 |
} else { // CMP |
| 510 |
deashort("cmp") |
| 511 |
} |
| 512 |
} |
| 513 |
break; |
| 514 |
case 0xc: // AND/MUL/ABCD/EXG |
| 515 |
switch (bits(6,3)) { |
| 516 |
case 3: // MULU |
| 517 |
def_param("mulu",2,WORD,bits(3,3),bits(0,3),0,bits(9,3)) break; |
| 518 |
case 7: // MULS |
| 519 |
def_param("muls",2,WORD,bits(3,3),bits(0,3),0,bits(9,3)) break; |
| 520 |
default: // ABCD/EXG/AND |
| 521 |
if (bits(4,5)==0x10) { // ABCD |
| 522 |
abcdshort("abcd") |
| 523 |
} else { // EXG/AND |
| 524 |
if ((bits(3,6)==0x28)||(bits(3,6)==0x29)||(bits(3,6)==0x31)) {//EXG |
| 525 |
switch (bits(3,5)) { |
| 526 |
case 8: def_param("exg",2,LONG,0,bits(0,3),0,bits(9,3)) break; |
| 527 |
case 9: def_param("exg",2,LONG,1,bits(0,3),1,bits(9,3)) break; |
| 528 |
case 0x11: def_param("exg",2,LONG,1,bits(0,3),0,bits(9,3)) break; |
| 529 |
} |
| 530 |
} else { // AND |
| 531 |
addshort("and") |
| 532 |
} |
| 533 |
} |
| 534 |
} |
| 535 |
break; |
| 536 |
case 0xd: // ADD/ADDX |
| 537 |
if (bits(6,2)==3) { // ADDA |
| 538 |
addashort("adda") |
| 539 |
} else { // ADDX/ADD |
| 540 |
if ((bits(4,2)==0)&&(bits(8,1)==1)) {// ADDX |
| 541 |
addxshort("addx") |
| 542 |
} else { // ADD |
| 543 |
addshort("add") |
| 544 |
} |
| 545 |
} |
| 546 |
break; |
| 547 |
case 0xe: // Shift/Rotate/Bit Field |
| 548 |
if (bits(6,2)==3) { // Mem Shift/Rotate, Bit Field |
| 549 |
if (bits(11,1)==0) { // Mem Shift/Rotate |
| 550 |
switch (bits(9,2)) { |
| 551 |
case 0: // ASL/ASR |
| 552 |
mshiftshort("as") break; |
| 553 |
case 1: // LSL/LSR |
| 554 |
mshiftshort("ls") break; |
| 555 |
case 2: // ROXL/ROXR |
| 556 |
mshiftshort("rox") break; |
| 557 |
case 3: // ROL/ROR |
| 558 |
mshiftshort ("ro") break; |
| 559 |
} |
| 560 |
} else { // Bit Field |
| 561 |
switch (bits(8,3)) { |
| 562 |
case 0: // BFTST |
| 563 |
break; |
| 564 |
case 1: // BFEXTU |
| 565 |
break; |
| 566 |
case 2: // BFCHG |
| 567 |
break; |
| 568 |
case 3: // BFEXTS |
| 569 |
break; |
| 570 |
case 4: // BFCLR |
| 571 |
break; |
| 572 |
case 5: // BFFFO |
| 573 |
break; |
| 574 |
case 6: // BFSET |
| 575 |
break; |
| 576 |
case 7: // BFINS |
| 577 |
break; |
| 578 |
} |
| 579 |
} |
| 580 |
} else { // Register Shift/Rotate |
| 581 |
switch (bits(3,2)) { |
| 582 |
case 0: // ASL/ASR |
| 583 |
rshiftshort("as") break; |
| 584 |
case 1: // LSL/LSR |
| 585 |
rshiftshort("ls") break; |
| 586 |
case 2: // ROXL/ROXR |
| 587 |
rshiftshort("rox") break; |
| 588 |
case 3: // ROL/ROR |
| 589 |
rshiftshort("ro") break; |
| 590 |
} |
| 591 |
} |
| 592 |
break; |
| 593 |
case 0xf: // Coprocessor Interface/MC68040 |
| 594 |
// and CPU32 Extensions |
| 595 |
switch (bits(6,6)) { |
| 596 |
case 0: { // P... |
| 597 |
uint16 op2 = read_uint16(); |
| 598 |
switch ((op2 >> 13) & 7) { |
| 599 |
case 0: // PMOVE |
| 600 |
prwshort("pmove") break; |
| 601 |
case 1: // PLOAD/PVALID/PFLUSH |
| 602 |
no_param("pload/pvalid/pflush") break; |
| 603 |
case 2: // PMOVE |
| 604 |
prwshort ("pmove") break; |
| 605 |
case 3: // PMOVE |
| 606 |
prwshort ("pmove") break; |
| 607 |
case 4: // PTST |
| 608 |
prwshort ("ptest") break; |
| 609 |
case 5: // PFLUSHR |
| 610 |
def_param ("pflushhr",1,LONG,bits(3,3),bits(0,3),0,0) break; |
| 611 |
} |
| 612 |
break; |
| 613 |
} |
| 614 |
case 0x10: case 0x11: case 0x12: case 0x13:// Cache |
| 615 |
if (bits(5,1)==0) { // CINV |
| 616 |
cinvpush("cinv"); |
| 617 |
} else { // CPUSH |
| 618 |
cinvpush("cpush"); |
| 619 |
} |
| 620 |
break; |
| 621 |
} |
| 622 |
break; |
| 623 |
default: // should never happen |
| 624 |
break; |
| 625 |
}} |
| 626 |
// |
| 627 |
|
| 628 |
static void add_int32_str (char *old,int32 value) { |
| 629 |
sprintf (&(old[strlen(old)]),"$%08x",value); |
| 630 |
} |
| 631 |
|
| 632 |
static void add_int16_str (char *old,int16 value) { |
| 633 |
sprintf (&(old[strlen(old)]),"$%04x",value); |
| 634 |
} |
| 635 |
|
| 636 |
static void add_int8_str (char *old,int8 value) { |
| 637 |
sprintf (&(old[strlen(old)]),"$%02x",value); |
| 638 |
} |
| 639 |
|
| 640 |
static void add_dec_int_str (char *old,int32 value) { |
| 641 |
sprintf (&(old[strlen(old)]),"%d",value); |
| 642 |
} |
| 643 |
|
| 644 |
static void print_range (int from,int to) { |
| 645 |
if (from < 8) dest = strcat (dest,"d"); else dest = strcat(dest,"a"); |
| 646 |
add_dec_int_str(dest,from & 7); |
| 647 |
if (to > from) { |
| 648 |
dest = strcat(dest,"-"); |
| 649 |
if (to < 8) dest = strcat (dest,"d"); else dest = strcat(dest,"a"); |
| 650 |
add_dec_int_str(dest,to & 7); |
| 651 |
} |
| 652 |
} |
| 653 |
|
| 654 |
static void decode_extended (bool a_reg,uint16 aaa,int32 old_mem) { |
| 655 |
uint16 value = read_uint16(); |
| 656 |
uint16 scale = 1 << ((value >> 9) & 3); |
| 657 |
uint16 d_a = (value >> 15) & 1; |
| 658 |
uint16 reg = (value >> 12) & 7; |
| 659 |
uint16 w_l = (value >> 11) & 1; |
| 660 |
strcat (dest,"("); |
| 661 |
if (((value >> 8) & 1)==0) { // standard format |
| 662 |
if (a_reg) { |
| 663 |
add_int8_str(dest,value & 0xff); |
| 664 |
strcat (dest,",a"); |
| 665 |
add_dec_int_str(dest,aaa); |
| 666 |
} else { |
| 667 |
add_int32_str(dest,old_mem*2+adr_off+(int32)(int8)(value)); |
| 668 |
strcat (dest,",pc"); |
| 669 |
} |
| 670 |
if (d_a==0) strcat (dest,",d"); else strcat (dest,",a"); |
| 671 |
add_dec_int_str(dest,reg); |
| 672 |
if (w_l==0) strcat (dest,".w"); else strcat (dest,".l"); |
| 673 |
if (scale > 1) { |
| 674 |
strcat (dest,"*"); |
| 675 |
add_dec_int_str(dest,scale); |
| 676 |
} |
| 677 |
} else { // extended format |
| 678 |
uint16 i_is = value & 3; |
| 679 |
uint16 bd_size = (value >> 4) & 3; |
| 680 |
uint16 bs = (value >> 7) & 1; |
| 681 |
uint16 is = (value >> 6) & 1; |
| 682 |
if (i_is!=0) strcat(dest,"["); |
| 683 |
if (bd_size!=1) { // base displacement |
| 684 |
switch (bd_size) { |
| 685 |
case 2: if (a_reg) |
| 686 |
add_int32_str(dest,read_int16()); |
| 687 |
else |
| 688 |
add_int32_str(dest,old_mem*2+adr_off+(int32)read_int16()); |
| 689 |
break; |
| 690 |
case 3: if (a_reg) |
| 691 |
add_int32_str(dest,read_int32()); |
| 692 |
else |
| 693 |
add_int32_str(dest,old_mem*2+adr_off+read_int32()); |
| 694 |
break; |
| 695 |
default: |
| 696 |
strcat (dest,"illegal base displacement "); |
| 697 |
} |
| 698 |
} |
| 699 |
if (bs==0) { |
| 700 |
if (bd_size!=1) strcat(dest,","); |
| 701 |
if (a_reg) { |
| 702 |
strcat (dest,"a"); |
| 703 |
add_dec_int_str(dest,aaa); |
| 704 |
} else { |
| 705 |
strcat (dest,"pc"); |
| 706 |
} |
| 707 |
} |
| 708 |
if ((is==0)&&(i_is>4)&&(i_is<8)) strcat(dest,"]"); |
| 709 |
if (is==0) { |
| 710 |
if (bs==0||bd_size!=1) strcat(dest,","); |
| 711 |
if (d_a==0) strcat (dest,",d"); else strcat (dest,",a"); |
| 712 |
add_dec_int_str(dest,reg); |
| 713 |
if (w_l==0) strcat (dest,".w"); else strcat (dest,".l"); |
| 714 |
if (scale > 1) { |
| 715 |
strcat (dest,"*"); |
| 716 |
add_dec_int_str(dest,scale); |
| 717 |
} |
| 718 |
} |
| 719 |
if ((i_is>0)&&(i_is<4)) strcat(dest,"]"); |
| 720 |
if (((is==0)&&(i_is==4))||((is==1)&&(i_is>4))) strcat(dest,"reserved"); else |
| 721 |
switch (i_is & 3) { |
| 722 |
case 2: strcat(dest,","); |
| 723 |
add_int32_str(dest,read_int16()); |
| 724 |
break; |
| 725 |
case 3: strcat(dest,","); |
| 726 |
add_int32_str(dest,read_int32()); |
| 727 |
break; |
| 728 |
} |
| 729 |
} |
| 730 |
strcat (dest,")"); |
| 731 |
} |
| 732 |
|
| 733 |
static int decode_address_mode (uint16 eee,uint16 aaa,t_size size) { |
| 734 |
int32 old_mem = mem_pos; |
| 735 |
switch (eee) { |
| 736 |
case 0: strcat (dest,"d"); |
| 737 |
add_dec_int_str(dest,aaa); |
| 738 |
break; |
| 739 |
case 1: strcat (dest,"a"); |
| 740 |
add_dec_int_str(dest,aaa); |
| 741 |
break; |
| 742 |
case 2: strcat (dest,"(a"); |
| 743 |
add_dec_int_str(dest,aaa); |
| 744 |
strcat (dest,")"); |
| 745 |
break; |
| 746 |
case 3: strcat (dest,"(a"); |
| 747 |
add_dec_int_str(dest,aaa); |
| 748 |
strcat (dest,")+"); |
| 749 |
break; |
| 750 |
case 4: strcat (dest,"-(a"); |
| 751 |
add_dec_int_str(dest,aaa); |
| 752 |
strcat (dest,")"); |
| 753 |
break; |
| 754 |
case 5: strcat (dest,"("); |
| 755 |
add_int16_str(dest,read_int16()); |
| 756 |
strcat (dest,",a"); |
| 757 |
add_dec_int_str(dest,aaa); |
| 758 |
strcat (dest,")"); |
| 759 |
break; |
| 760 |
case 6: decode_extended(true,aaa,0); |
| 761 |
break; |
| 762 |
case 7: switch (aaa) { |
| 763 |
case 0: add_int16_str(dest,read_int16()); |
| 764 |
strcat (dest,".w"); |
| 765 |
break; |
| 766 |
case 1: add_int32_str(dest,read_int32()); |
| 767 |
strcat (dest,".l"); |
| 768 |
break; |
| 769 |
case 2: strcat (dest,"("); |
| 770 |
add_int32_str(dest,old_mem*2+adr_off+(int32)read_int16()); |
| 771 |
strcat (dest,",pc)"); |
| 772 |
break; |
| 773 |
case 3: decode_extended(false,0,old_mem); |
| 774 |
break; |
| 775 |
case 4: strcat (dest,"#"); |
| 776 |
switch (size) { |
| 777 |
case BYTE_SILENT: |
| 778 |
case BYTE: add_int8_str(dest,read_int8() & 0xff); |
| 779 |
break; |
| 780 |
case WORD_SILENT: |
| 781 |
case WORD: add_int16_str(dest,read_int16()); |
| 782 |
break; |
| 783 |
case LONG_SILENT: |
| 784 |
case LONG: add_int32_str(dest,read_int32()); |
| 785 |
break; |
| 786 |
case NOSIZE: add_int8_str(dest,opcode & 0xff); |
| 787 |
break; |
| 788 |
default: ; |
| 789 |
} |
| 790 |
break; |
| 791 |
default: error (ER_UNKNOWN_ADDRESS_MODE); |
| 792 |
return -1; |
| 793 |
} |
| 794 |
break; |
| 795 |
case AD_C: strcat (dest,con_str[aaa]); |
| 796 |
break; |
| 797 |
case AD_BRANCH: |
| 798 |
switch (size){ |
| 799 |
case BYTE_SILENT: |
| 800 |
case BYTE: add_int32_str(dest, (int32)(int8)aaa+old_mem*2+adr_off); |
| 801 |
break; |
| 802 |
case WORD_SILENT: |
| 803 |
case WORD: add_int32_str(dest, (int32)read_int16()+old_mem*2+adr_off); |
| 804 |
break; |
| 805 |
case LONG_SILENT: |
| 806 |
case LONG: add_int32_str(dest, read_int32()+old_mem*2+adr_off); |
| 807 |
break; |
| 808 |
default: |
| 809 |
abort(); |
| 810 |
break; |
| 811 |
} |
| 812 |
break; |
| 813 |
case AD_MULT: { |
| 814 |
int dir = 1; |
| 815 |
int off = 0; |
| 816 |
if (aaa != 0) { |
| 817 |
dir = -1; |
| 818 |
off = 15; |
| 819 |
} |
| 820 |
int lend = -1; |
| 821 |
bool first = true; |
| 822 |
for (int i=0;i < 16;i++) { |
| 823 |
if (((mask >> (off + dir * i))& 1) == 0) { |
| 824 |
// print reg from lend+1 to i-1 |
| 825 |
if ((lend+1) <= (i-1)) { |
| 826 |
if (!first) dest = strcat (dest,"/"); else first = false; |
| 827 |
if (((lend + 1) < 8) && ((i-1) > 7)) { |
| 828 |
print_range (lend+1,7); |
| 829 |
dest = strcat (dest,"/"); |
| 830 |
print_range (8,i-1); |
| 831 |
} else { |
| 832 |
print_range (lend+1,i-1); |
| 833 |
} |
| 834 |
} |
| 835 |
lend = i; |
| 836 |
} |
| 837 |
} |
| 838 |
if (((mask >> (off + dir * 15)) & 1) == 1) { // print last regs |
| 839 |
if (!first) dest = strcat (dest,"/"); |
| 840 |
print_range (lend+1,15); |
| 841 |
} |
| 842 |
break; |
| 843 |
} |
| 844 |
case AD_DATA_IMM: |
| 845 |
strcat (dest,"#"); |
| 846 |
switch (size) { |
| 847 |
case BYTE: case BYTE_SILENT: add_int8_str(dest,data_val); break; |
| 848 |
case WORD: case WORD_SILENT: add_int16_str(dest,data_val); break; |
| 849 |
case LONG: case LONG_SILENT: add_int32_str(dest,data_val); break; |
| 850 |
default: ; |
| 851 |
} |
| 852 |
break; |
| 853 |
case AD_DATA: |
| 854 |
switch (size) { |
| 855 |
case BYTE: case BYTE_SILENT: add_int8_str(dest,data_val); break; |
| 856 |
case WORD: case WORD_SILENT: add_int16_str(dest,data_val); break; |
| 857 |
case LONG: case LONG_SILENT: add_int32_str(dest,data_val); break; |
| 858 |
default: ; |
| 859 |
} |
| 860 |
break; |
| 861 |
case AD_CACHE: |
| 862 |
switch (aaa) { |
| 863 |
case 1: strcat(dest, "dc"); break; |
| 864 |
case 2: strcat(dest, "ic"); break; |
| 865 |
case 3: strcat(dest, "dc/ic"); break; |
| 866 |
default: strcat(dest, "?"); break; |
| 867 |
} |
| 868 |
break; |
| 869 |
default: |
| 870 |
error (ER_UNKNOWN_ADDRESS_MODE); |
| 871 |
return -1; |
| 872 |
} |
| 873 |
return 0; |
| 874 |
} |
| 875 |
|
| 876 |
static void diss (char *ndest,uint16 *nmem,int &npos,unsigned int adr) { |
| 877 |
dest = ndest; mem = nmem; mem_pos = npos; adr_off=adr; |
| 878 |
dest[0]=0; |
| 879 |
opcode = read_uint16 (); |
| 880 |
strcat(dest,"\t"); |
| 881 |
|
| 882 |
no_param("?") |
| 883 |
parse(); |
| 884 |
|
| 885 |
dest = strcat(dest,op_name); |
| 886 |
if ((dest_eee == AD_BRANCH) && (size != NOSIZE)) dest = strcat (dest,cc_str[dest_aaa]); |
| 887 |
switch (size) { |
| 888 |
case BYTE: strcat (dest,source_eee == AD_BRANCH ? ".s\t" : ".b\t"); break; |
| 889 |
case WORD: strcat (dest,source_eee == AD_BRANCH ? "\t" : ".w\t"); break; |
| 890 |
case LONG: strcat (dest,".l\t"); break; |
| 891 |
default: dest = strcat (dest,"\t"); break; |
| 892 |
} |
| 893 |
if (count_param > 0) { |
| 894 |
if (decode_address_mode(source_eee,source_aaa,size) == -1) { |
| 895 |
npos = mem_pos; |
| 896 |
return; |
| 897 |
} |
| 898 |
if (count_param > 1) { |
| 899 |
strcat (dest, ","); |
| 900 |
if (decode_address_mode(dest_eee,dest_aaa,size) == -1) { |
| 901 |
npos = mem_pos; |
| 902 |
return; |
| 903 |
} |
| 904 |
} |
| 905 |
} |
| 906 |
npos = mem_pos; |
| 907 |
} |
| 908 |
|
| 909 |
|
| 910 |
/* |
| 911 |
* Disassemble one instruction, return number of bytes |
| 912 |
*/ |
| 913 |
|
| 914 |
int disass_68k(FILE *f, uint32 adr, uint16 *m) |
| 915 |
{ |
| 916 |
char output[80]; |
| 917 |
int mem_pos = 0; |
| 918 |
diss(output, m, mem_pos,adr); |
| 919 |
for (int i=0;i<4;i++) if (i<mem_pos) fprintf(f,"%04x ", m[i]); else fprintf(f," "); |
| 920 |
fprintf(f, "%s\n", output); |
| 921 |
return mem_pos << 1; |
| 922 |
} |
