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dis68k.c
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dis68k.c
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/* DIS68K by wrm
Submitted to public domain 10/08/93 (V1.2)
Current version 1.22, adds "raw" disasm output, ie ready to re-assemble
1999-11-04: Add 68030 instructions,
Add labels.
2019-03-10: Remove conio dependency, fix modern C build errors.
onward: see Git history. */
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <ctype.h>
#include <string.h>
// Enable the #define below to print diagnostics.
//#define PRINT_DIAGNOSTICS
#ifdef PRINT_DIAGNOSTICS
#define diagnostic_printf printf
#else
#define diagnostic_printf(...) while(false);
#endif
struct OpcodeDetails {
uint16_t and;
uint16_t xor;
};
const struct OpcodeDetails optab[88] = {
{0x0000,0x0000}, {0xF1F0,0xC100}, {0xF000,0xD000}, {0xF0C0,0xD0C0},
{0xFF00,0x0600}, {0xF100,0x5000}, {0xF130,0xD100}, {0xF000,0xC000},
{0xFF00,0x0200}, {0xF118,0xE100}, {0xFFC0,0xE1C0}, {0xF118,0xE000},
{0xFFC0,0xE0C0}, {0xF000,0x6000}, {0xF1C0,0x0140}, {0xFFC0,0x0840},
{0xF1C0,0x0180}, {0xFFC0,0x0880}, {0xF1C0,0x01C0}, {0xFFC0,0x08C0},
{0xF1C0,0x0100}, {0xFFC0,0x0800}, {0xF1C0,0x4180}, {0xFF00,0x4200},
{0xF100,0xB000}, {0xF0C0,0xB0C0}, {0xFF00,0x0C00}, {0xF138,0xB108},
{0xF0F8,0x50C8}, {0xF1C0,0x81C0}, {0xF1C0,0x80C0}, {0xF100,0xB100},
{0xFF00,0x0A00}, {0xF100,0xC100}, {0xFFB8,0x4880}, {0xFFC0,0x4EC0},
{0xFFC0,0x4E80}, {0xF1C0,0x41C0}, {0xFFF8,0x4E50}, {0xF118,0xE108},
{0xFFC0,0xE3C0}, {0xF118,0xE008}, {0xFFC0,0xE2C0}, {0xC000,0x0000},
{0xFFC0,0x44C0}, {0xFFC0,0x46C0}, {0xFFC0,0x40C0}, {0xFFF0,0x4E60},
{0xC1C0,0x0040}, {0xFB80,0x4880}, {0xF138,0x0108}, {0xF100,0x7000},
{0xF1C0,0xC1C0}, {0xF1C0,0xC0C0}, {0xFFC0,0x4800}, {0xFF00,0x4400},
{0xFF00,0x4000}, {0xFFFF,0x4E71}, {0xFF00,0x4600}, {0xF000,0x8000},
{0xFF00,0x0000}, {0xFFC0,0x4840}, {0xFFFF,0x4E70}, {0xF118,0xE118},
{0xFFC0,0xE7C0}, {0xF118,0xE018}, {0xFFC0,0xE6C0}, {0xF118,0xE110},
{0xFFC0,0xE5C0}, {0xF118,0xE010}, {0xFFC0,0xE4C0}, {0xFFFF,0x4E73},
{0xFFFF,0x4E77}, {0xFFFF,0x4E75}, {0xF1F0,0x8100}, {0xF0C0,0x50C0},
{0xFFFF,0x4E72}, {0xF000,0x9000}, {0xF0C0,0x90C0}, {0xFF00,0x0400},
{0xF100,0x5100}, {0xF130,0x9100}, {0xFFF8,0x4840}, {0xFFC0,0x4AC0},
{0xFFF0,0x4E40}, {0xFFFF,0x4E76}, {0xFF00,0x4A00}, {0xFFF8,0x4E58}
};
uint32_t address, romstart;
bool rawmode = false;
struct MapEntry {
uint32_t start;
uint32_t end;
enum Type {
End,
Data,
Code
} type;
} *map = NULL;
const char bra_tab[][4] = {
"BRA", "BSR", "BHI", "BLS",
"BCC", "BCS", "BNE", "BEQ",
"BVC", "BVS", "BPL", "BMI",
"BGE", "BLT", "BGT", "BLE"
};
const char scc_tab[][4] = {
"ST", "SF", "SHI", "SLS",
"SCC", "SCS", "SNE", "SEQ",
"SVC", "SVS", "SPL", "SMI",
"SGE", "SLT", "SGT", "SLE"
};
const char size_arr[3] = {'B','W','L'};
/*!
Reads from @c filename and populates the global variable @c map.
If @c filename is @c NULL, populates @c map with the empty map.
@returns @c false if a filename is specified but could not be opened
or else could not properly be parsed. @c true otherwise.
*/
bool readmap(const char *filename) {
FILE *fmap;
// Create a sixteen-item map, to be getting on with.
size_t allocated_map_size = 16;
map = (struct MapEntry *)malloc(sizeof(struct MapEntry) * allocated_map_size);
if (!filename || !(fmap = fopen(filename, "rt"))) {
if (filename) {
fprintf(stderr, "Couldn't open %s as a map file\n", filename);
return false;
}
romstart = 0;
map[0].start = 0L;
map[0].end = 0xffffffff;
map[0].type = Code;
map[1].type = End;
} else {
if (!fscanf(fmap,"romstart = %X", &romstart)) {
fprintf(stderr, "Error in romstart = line!\n");
return false;
}
size_t index = 0;
while (true) {
uint32_t start, end;
char type[10];
const int items_read = fscanf(fmap, "%x,%x,%9s", &start, &end, type);
if (items_read == 3) {
if (index+1 >= allocated_map_size) {
// Default to 16 entries when first creating a map, double each time the existing
// estimate isn't enough for both this entry and the terminator yet to come.
const size_t new_map_size = allocated_map_size ? (allocated_map_size * 2) : 16;
map = realloc(map, sizeof(struct MapEntry) * new_map_size);
allocated_map_size = new_map_size;
if (!map) {
fprintf(stderr, "Couldn't allocate enough space for map\n");
return false;
}
}
map[index].start = start;
map[index].end = end;
map[index].type = End;
if(strcmp(type,"data")==0) map[index].type = Data;
if(strcmp(type,"code")==0) map[index].type = Code;
if (map[index].type == End) {
fprintf(stderr, "Couldn't parse type in map file at line %lu ('code' or 'data' misspelt)\n", index+2);
return false;
}
++ index;
} else {
if(items_read > 0) {
fprintf(stderr, "Syntax error on line %lu (%d)\n", index+2, items_read);
return false;
}
break; // i.e. feof.
}
}
map[index].type = End;
fclose(fmap);
}
return true;
}
/*!
Gets and echoes the next byte from stdin and increments the global @c address;
if stdin is exhausted, prints an error and causes the program to exit with
code EXIT_FAILURE.
*/
unsigned int getbyte() {
const int byte = fgetc(stdin);
if (feof(stdin)) {
fprintf(stderr, "Unexpected end of input\n");
exit(EXIT_FAILURE);
}
++ address;
printf("%02x ", byte);
return byte;
}
/*!
Gets and echoes the next word from stdin and increments the global @c address twice;
if stdin is exhausted, prints an error and causes the program to exit with
code EXIT_FAILURE.
*/
int getword() {
int word = fgetc(stdin) << 8;
word |= fgetc(stdin);
if (feof(stdin)) {
fprintf(stderr, "Unexpected end of input\n");
exit(EXIT_FAILURE);
}
address += 2;
if (!rawmode) {
printf("%04x ", word);
}
return word;
}
/*!
Prints the addressing mode @c mode, using @c reg and @c size, to @c out_s.
@param mode 0 to 12, indicating addressing mode.
@param size 0 = byte, 1 = word, 2 = long.
*/
void sprintmode(unsigned int mode, unsigned int reg, unsigned int size, char *out_s) {
const char ir[2] = {'W','L'}; /* for mode 6 */
switch(mode) {
case 0 : sprintf(out_s, "D%i", reg); break;
case 1 : sprintf(out_s, "A%i", reg); break;
case 2 : sprintf(out_s, "(A%i)", reg); break;
case 3 : sprintf(out_s, "(A%i)+", reg); break;
case 4 : sprintf(out_s, "-(A%i)", reg); break;
case 5 : /* reg + disp */
case 9 : { /* pcr + disp */
int32_t displacement = (int32_t) getword();
if (displacement >= 32768) displacement -= 65536;
if (mode == 5) {
sprintf(out_s, "%+i(A%i)", displacement, reg);
} else {
const uint32_t ldata = address - 2 + displacement;
if (!rawmode) {
sprintf(out_s, "%+i(PC) {$%08x}", displacement, ldata);
} else {
sprintf(out_s, "%+i(PC)", displacement);
}
}
} break;
case 6 : /* Areg with index + disp */
case 10 : {/* PC with index + disp */
const int data = getword(); /* index and displacement data */
int displacement = (data & 0x00FF);
if (displacement >= 128) displacement -= 256;
const int ireg = (data & 0x7000) >> 12;
const int itype = (data & 0x8000); /* == 0 is Dreg */
const int isize = (data & 0x0800) >> 11; /* == 0 is .W else .L */
if (mode == 6) {
if (itype == 0) {
sprintf(out_s, "%+i(A%i,D%i.%c)", displacement, reg, ireg, ir[isize]);
} else {
sprintf(out_s, "%+i(A%i,A%i.%c)", displacement, reg, ireg, ir[isize]);
}
} else { /* PC */
if (itype == 0) {
sprintf(out_s, "%+i(PC,D%i.%c)", displacement, ireg, ir[isize]);
} else {
sprintf(out_s, "%+i(PC,A%i.%c)", displacement, ireg, ir[isize]);
}
}
} break;
case 7 :
sprintf(out_s, "$0000%04x", getword());
break;
case 8 : {
const int data1 = getword();
const int data2 = getword();
sprintf(out_s, "$%04x%04x", data1, data2);
} break;
case 11 : {
const int data1 = getword();
switch(size) {
case 0 : sprintf(out_s, "#$%02x", (data1 & 0x00FF));
break;
case 1 : sprintf(out_s, "#$%04x", data1);
break;
case 2 : {
const int data2 = getword();
sprintf(out_s, "#$%04x%04x", data1, data2);
} break;
}
} break;
default : fprintf(stderr, "Mode out of range in sprintmode = %i\n", mode);
break;
}
}
/*!
Decodes the addressing mode from @c instruction.
@returns A mode in the range 0 to 11, if a valid addressing mode could be
determined; 12 otherwise.
*/
int getmode(int instruction) {
const int mode = (instruction & 0x0038) >> 3;
const int reg = instruction & 0x0007;
if (mode == 7) {
if (reg >= 5) {
return 12; /* i.e. invalid */
} else {
return 7 + reg;
}
}
return mode;
}
void disasm(unsigned long int start, unsigned long int end) {
address = start;
if (address < romstart) {
printf("Address < RomStart in disasm()!\n");
exit(1);
}
while (!feof(stdin) && (address < end)) {
if (!rawmode) {
printf("%08x : ", address);
} else {
printf(" ");
}
const uint32_t start_address = address;
const int word = getword();
bool decoded = false;
char opcode_s[50], operand_s[101];
for (int opnum = 1; opnum <= 87; ++opnum) {
if ((word & optab[opnum].and) == optab[opnum].xor) {
/* Diagnostic code */
diagnostic_printf("(%i) ",opnum);
switch(opnum) { /* opnum = 1..85 */
case 1 :
case 74 : { /* ABCD + SBCD */
const int sreg = word & 0x0007;
const int dreg = (word & 0x0E00) >> 9;
if (opnum == 1) {
sprintf(opcode_s, "ABCD");
} else {
sprintf(opcode_s, "SBCD");
}
if ((word & 0x0008) == 0) {
/* reg-reg */
sprintf(operand_s, "D%i,D%i", sreg, dreg);
} else {
/* mem-mem */
sprintf(operand_s, "-(A%i),-A(%i)", sreg, dreg);
}
decoded = true;
} break;
case 2 :
case 7 :
case 31 :
case 59 : /* ADD, AND, EOR, OR */
case 77 : { /* SUB */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
const int size = (word & 0x00C0) >> 6;
/* Diagnostic code */
diagnostic_printf("dmode = %i, dreg = %i, size = %i",dmode,dreg,size);
if (size == 3) break;
/*
if (dmode == 1) break;
*/
if ((opnum == 2) && (dmode == 1) && (size == 0)) break;
if ((opnum == 77) && (dmode == 1) && (size == 0)) break;
const int dir = (word & 0x0100) >> 8; /* 0 = dreg dest */
if ((opnum == 31) && (dir == 0)) break;
/* dir == 1 : Dreg is source */
if ((dir == 1) && (dmode >= 9)) break;
switch(opnum) {
case 2 : sprintf(opcode_s, "ADD.%c", size_arr[size]);
break;
case 7 : sprintf(opcode_s,"AND.%c", size_arr[size]);
break;
case 31 : sprintf(opcode_s, "EOR.%c", size_arr[size]);
break;
case 59 : sprintf(opcode_s, "OR.%c", size_arr[size]);
break;
case 77 : sprintf(opcode_s, "SUB.%c", size_arr[size]);
break;
}
char dest_s[50];
sprintmode(dmode, dreg, size, dest_s);
const int sreg = (word & 0x0E00) >> 9;
char source_s[50];
sprintf(source_s, "D%i", sreg);
/* reverse source & dest if dir == 0 */
if (dir != 0) {
sprintf(operand_s, "%s,%s", source_s, dest_s);
} else {
sprintf(operand_s, "%s,%s", dest_s, source_s);
}
decoded = true;
} break;
case 3 :
case 78 : { /* ADDA + SUBA */
const int smode = getmode(word);
const int sreg = word & 0x0007;
const int dreg = (word & 0x0E00) >> 9;
const int size = ((word & 0x0100) >> 8) + 1;
switch(opnum) {
case 3 : sprintf(opcode_s, "ADDA.%c", size_arr[size]);
break;
case 78 : sprintf(opcode_s, "SUBA.%c", size_arr[size]);
break;
}
char source_s[50];
sprintmode(smode, sreg, size, source_s);
sprintf(operand_s, "%s,A%i", source_s, sreg);
decoded = true;
} break;
case 4 :
case 8 :
case 26 :
case 32 :
case 60 :
case 79 : { /* ADDI, ANDI, CMPI, EORI, ORI, SUBI */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
const int size = (word & 0x00C0) >> 6;
if (size == 3) break;
if (dmode == 1) break;
if ((dmode == 9) || (dmode == 10)) break; /* Invalid */
if (dmode == 12) break;
if ((dmode == 11) && /* ADDI, CMPI, SUBI */
((opnum == 4) || (opnum == 26) || (opnum == 79))) break;
switch(opnum) {
case 4 : sprintf(opcode_s, "ADDI.%c", size_arr[size]);
break;
case 8 : sprintf(opcode_s, "ANDI.%c", size_arr[size]);
break;
case 26 : sprintf(opcode_s, "CMPI.%c", size_arr[size]);
break;
case 32 : sprintf(opcode_s, "EORI.%c", size_arr[size]);
break;
case 60 : sprintf(opcode_s, "ORI.%c", size_arr[size]);
break;
case 79 : sprintf(opcode_s, "SUBI.%c", size_arr[size]);
break;
}
const int data = getword();
char source_s[50];
switch(size) {
case 0 : sprintf(source_s, "#$%02X", (data & 0x00FF));
break;
case 1 : sprintf(source_s, "#$%04X", data);
break;
case 2 :
sprintf(source_s, "#$%04X%04X", data, getword());
break;
}
char dest_s[50];
if (dmode == 11) {
sprintf(dest_s, "SR");
} else {
sprintmode(dmode, dreg, size, dest_s);
}
sprintf(operand_s, "%s,%s", source_s, dest_s);
decoded = true;
} break;
case 5 :
case 80 : {/* ADDQ + SUBQ */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
const int size = (word & 0x00C0) >> 6;
if (size == 3) break;
if (dmode >= 9) break;
if ((size == 0) && (dmode == 1)) break;
if (opnum == 5) {
sprintf(opcode_s,"ADDQ.%c",size_arr[size]);
} else {
sprintf(opcode_s,"SUBQ.%c",size_arr[size]);
}
char dest_s[50];
sprintmode(dmode, dreg, size, dest_s);
const int count = (word & 0x0E00) >> 9;
sprintf(operand_s, "#%i,%s", count ? count : 8, dest_s);
decoded = true;
} break;
case 6 :
case 81 : /* ADDX + SUBX */
case 27 : { /* CMPM */
const int size = (word & 0x00C0) >> 6;
if (size == 3) break;
const int sreg = word & 0x0007;
const int dreg = (word & 0x0E00) >> 9;
switch(opnum) {
case 6 : sprintf(opcode_s, "ADDX.%c", size_arr[size]);
break;
case 81 : sprintf(opcode_s, "SUBX.%c", size_arr[size]);
break;
case 27 : sprintf(opcode_s, "CMPM.%c", size_arr[size]);
break;
}
if ((opnum != 27) && ((word & 0x0008) == 0)) {
/* reg-reg */
sprintf(operand_s,"D%i,D%i",sreg,dreg);
} else {
/* mem-mem */
sprintf(operand_s,"-(A%i),-(A%i)",sreg,dreg);
}
if (opnum == 27) {
sprintf(operand_s,"(A%i)+,(A%i)+",sreg,dreg);
}
decoded = true;
} break;
case 9 :
case 11 :
case 39 :
case 41 :
case 63 :
case 65 :
case 67 :
case 69 : { /* ASL, ASR, LSL, LSR, ROL, ROR, ROXL, ROXR */
const int dreg = word & 0x0007;
const int size = (word & 0x00C0) >> 6;
if (size == 3) break;
switch(opnum) {
case 9 : sprintf(opcode_s, "ASL.%c", size_arr[size]);
break;
case 11 : sprintf(opcode_s, "ASR.%c", size_arr[size]);
break;
case 39 : sprintf(opcode_s, "LSL.%c", size_arr[size]);
break;
case 41 : sprintf(opcode_s, "LSR.%c", size_arr[size]);
break;
case 63 : sprintf(opcode_s, "ROR.%c", size_arr[size]);
break;
case 65 : sprintf(opcode_s, "ROL.%c", size_arr[size]);
break;
case 67 : sprintf(opcode_s, "ROXL.%c", size_arr[size]);
break;
case 69 : sprintf(opcode_s, "ROXR.%c", size_arr[size]);
break;
}
int count = (word & 0x0E00) >> 9;
if (((word & 0x0020) >> 5) == 0) { /* imm */
if (count == 0) count = 8;
sprintf(operand_s, "#%i,D%i", count, (word & 0x0007));
} else { /* count in dreg */
sprintf(operand_s, "D%i,D%i", count, (word & 0x0007));
}
decoded = true;
} break;
case 10 :
case 12 :
case 40 :
case 42 :
case 64 :
case 66 :
case 68 : /* Memory-to-memory */
case 70 : { /* ASL, ASR, LSL, LSR, ROL, ROR, ROXL, ROXR */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
if ((dmode <= 1) || (dmode >= 9)) break; /* Invalid */
switch(opnum) {
case 10 : sprintf(opcode_s,"ASL");
break;
case 12 : sprintf(opcode_s,"ASR");
break;
case 40 : sprintf(opcode_s,"LSL");
break;
case 42 : sprintf(opcode_s,"LSR");
break;
case 64 : sprintf(opcode_s,"ROR");
break;
case 66 : sprintf(opcode_s,"ROL");
break;
case 68 : sprintf(opcode_s,"ROXL");
break;
case 70 : sprintf(opcode_s,"ROXR");
break;
}
sprintmode(dmode, dreg, 0, operand_s);
decoded = true;
} break;
case 13 : {/* Bcc */
const int cc = (word & 0x0F00) >> 8;
sprintf(opcode_s, "%s", bra_tab[cc]);
int offset = (word & 0x00FF);
if (offset != 0) {
if (offset >= 128) offset -= 256;
if (!rawmode) {
sprintf(operand_s, "$%08x", address + offset);
} else {
sprintf(operand_s, "*%+d", offset);
}
} else {
offset = getword();
if (offset >= 32768l) offset -= 65536l;
if (!rawmode) {
sprintf(operand_s, "$%08x" , address - 2 + offset);
} else {
sprintf(operand_s, "*%+d", offset);
}
}
decoded = true;
} break;
case 14 :
case 15 :
case 16 :
case 17 : /* BCHG + BCLR */
case 18 :
case 19 : /* BSET */
case 20 :
case 21 : {/* BTST */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
if (dmode == 1) break;
if (dmode >= 11) break;
if ((opnum < 20) && (dmode >= 9)) break;
const int sreg = (word & 0x0E00) >> 9;
char source_s[50];
switch(opnum) {
case 14 : /* BCHG_DREG */
sprintf(opcode_s, "BCHG");
sprintf(source_s, "D%i", sreg);
break;
case 15 : {/* BCHG_IMM */
sprintf(opcode_s, "BCHG");
const int data = getword() & 0x002F;
sprintf(source_s, "#%i", data);
} break;
case 16 : /* BCLR_DREG */
sprintf(opcode_s, "BCLR");
sprintf(source_s, "D%i", sreg);
break;
case 17 : {/* BCLR_IMM */
sprintf(opcode_s, "BCLR");
const int data = getword() & 0x002F;
sprintf(source_s, "#%i", data);
} break;
case 18 : /* BSET_DREG */
sprintf(opcode_s, "BSET");
sprintf(source_s, "D%i", sreg);
break;
case 19 : { /* BSET_IMM */
sprintf(opcode_s, "BSET");
const int data = getword() & 0x002F;
sprintf(source_s, "#%i", data);
} break;
case 20 : /* BTST_DREG */
sprintf(opcode_s,"BTST");
sprintf(source_s, "D%i", sreg);
break;
case 21 : {/* BTST_IMM */
sprintf(opcode_s,"BTST");
const int data = getword() & 0x002F;
sprintf(source_s, "#%i", data);
} break;
}
char dest_s[50];
sprintmode(dmode, dreg, 0, dest_s);
sprintf(operand_s, "%s,%s", source_s, dest_s);
decoded = true;
} break;
case 22 : /* CHK */
case 29 :
case 30 :
case 52 :
case 53 : /* DIVS, DIVU, MULS, MULU */
case 24 : {/* CMP */
const int smode = getmode(word);
if ((smode == 1) && (opnum != 24)) break;
if (smode >= 12) break;
const int sreg = word & 0x0007;
const int dreg = (word & 0x0E00) >> 9;
int size;
if (opnum == 24) {
size = (word & 0x00C0) >> 6;
} else {
size = 1; /* WORD */
}
if (size == 3) break;
switch(opnum) {
case 22 : /* CHK */
sprintf(opcode_s, "CHK");
break;
case 24 : /* CMP */
sprintf(opcode_s, "CMP.%c", size_arr[size]);
break;
case 29 : /* DIVS */
sprintf(opcode_s, "DIVS");
break;
case 30 : /* DIVU */
sprintf(opcode_s, "DIVU");
break;
case 52 : /* MULS */
sprintf(opcode_s, "MULS");
break;
case 53 : /* MULU */
sprintf(opcode_s, "MULU");
break;
}
char source_s[50];
sprintmode(smode, sreg, size, source_s);
sprintf(operand_s, "%s,D%i", source_s, dreg);
decoded = true;
} break;
case 23 : {/* CLR */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
if ((dmode == 1) || (dmode >= 9)) break; /* Invalid */
const int size = (word & 0x00C0) >> 6;
if (size == 3) break;
sprintf(opcode_s, "CLR.%c", size_arr[size]);
sprintmode(dmode, dreg, size, operand_s);
decoded = true;
} break;
case 25 : {/* CMPA */
const int smode = getmode(word);
const int sreg = word & 0x0007;
const int areg = (word & 0x0E00) >> 9;
const int size = ((word & 0x0100) >> 8) + 1;
sprintf(opcode_s, "CMPA.%c", size_arr[size]);
char source_s[50];
sprintmode(smode, sreg, size, source_s);
sprintf(operand_s, "%s,A%i", source_s, areg);
decoded = true;
} break;
case 28 : { /* DBcc */
const int cc = (word & 0x0F00) >> 8;
sprintf(opcode_s, "D%s", bra_tab[cc]);
if (cc == 0) sprintf(opcode_s, "DBT");
if (cc == 1) sprintf(opcode_s, "DBF");
int offset = getword();
if (offset >= 32768) offset -= 65536;
const int dreg = word & 0x0007;
sprintf(operand_s, "D%i,$%08x", dreg, address - 2 + offset);
decoded = true;
} break;
case 33 : { /* EXG */
const int dmode = (word & 0x00F8) >> 3;
/* 8 - Both Dreg
9 - Both Areg
17 - Dreg + Areg */
if ((dmode != 8) && (dmode != 9) && (dmode != 17)) break;
const int dreg = word & 0x0007;
const int areg = (word & 0x0E00) >> 9;
sprintf(opcode_s, "EXG");
switch(dmode) {
case 8 : sprintf(operand_s, "D%i,D%i", dreg, areg);
break;
case 9 : sprintf(operand_s, "A%i,A%i", dreg, areg);
break;
case 17 : sprintf(operand_s, "D%i,A%i", dreg, areg);
break;
}
decoded = true;
} break;
case 34 : {/* EXT */
const int dreg = word & 0x0007;
const int size = ((word & 0x0040) >> 6) + 1;
sprintf(opcode_s, "EXT.%c", size_arr[size]);
sprintf(operand_s, "D%i", dreg);
decoded = true;
} break;
case 35 :
case 36 : {/* JMP + JSR */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
if (dmode <= 1) break;
if ((dmode == 3) || (dmode == 4)) break;
if (dmode >= 11) break; /* Invalid */
switch(opnum) {
case 35 : sprintf(opcode_s, "JMP");
break;
case 36 : sprintf(opcode_s, "JSR");
break;
}
sprintmode(dmode, dreg, 0, operand_s);
decoded = true;
} break;
case 37 : {/* LEA */
const int smode = getmode(word);
if ((smode == 0) || (smode == 1)) break;
if ((smode == 3) || (smode == 4)) break;
if (smode >= 11) break;
const int sreg = word & 0x0007;
sprintf(opcode_s, "LEA");
char source_s[50];
sprintmode(smode, sreg, 0, source_s);
const int dreg = (word & 0x0E00) >> 9;
sprintf(operand_s, "%s,A%i", source_s, dreg);
decoded = true;
} break;
case 38 : {/* LINK */
const int areg = word & 0x0007;
int offset = getword();
if (offset >= 32768) offset -= 65536;
sprintf(opcode_s, "LINK");
sprintf(operand_s, "A%i,#%+i", areg, offset);
decoded = true;
} break;
case 43 : {/* MOVE */
const int smode = getmode(word);
const int data = ((word & 0x0E00) >> 9) | ((word & 0x01C0) >> 3);
const int dmode = getmode(data);
const int sreg = word & 0x0007;
const int dreg = data & 0x0007;
int size = (word & 0x3000) >> 12; /* 1=B, 2=L, 3=W */
if (size == 0) break;
switch(size) {
case 1 : size = 0;
break;
case 2 : size = 2;
break;
case 3 : size = 1;
break;
}
/* 0=B, 1=W, 2=L */
/*
printf("smode = %i dmode = %i ",smode,dmode);
printf("sreg = %i dreg = %i \n",sreg,dreg);
*/
/* check for illegal modes */
// smode=1, size=1 is legal; 36 0d
// if ((smode == 1) && (size == 1)) break;
// smode=9 is legal; 2d 40 ff ec
// smode=10 is legal; 30 3b 00 00
// if ((smode == 9) || (smode == 10)) break;
if (smode > 11) break;
if (dmode == 1) break;
if (dmode >= 9) break;
sprintf(opcode_s,"MOVE.%c",size_arr[size]);
char source_s[50], dest_s[50];
sprintmode(smode, sreg, size, source_s);
sprintmode(dmode, dreg, size, dest_s);
sprintf(operand_s, "%s,%s ", source_s, dest_s);
decoded = true;
} break;
case 44 : /* MOVE to CCR */
case 45 : {/* MOVE to SR */
const int smode = getmode(word);
const int sreg = word & 0x0007;
const int size = 1; /* WORD */
if (smode == 1) break;
if (smode >= 12) break;
sprintf(opcode_s, "MOVE.W");
char source_s[50];
sprintmode(smode, sreg, size, source_s);
if (opnum == 44) {
sprintf(operand_s, "%s,CCR", source_s);
} else {
sprintf(operand_s, "%s,SR", source_s);
}
decoded = true;
} break;
case 46 : {/* MOVE from SR */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
const int size = 1; /* WORD */
if (dmode == 1) break;
if (dmode >= 9) break;
sprintf(opcode_s, "MOVE.W");
char dest_s[50];
sprintmode(dmode, dreg, size, dest_s);
sprintf(operand_s, "SR,%s", dest_s);
decoded = true;
} break;
case 47 : { /* MOVE USP */
const int sreg = word & 0x0007;
sprintf(opcode_s, "MOVE");
if ((word & 0x0008) == 0) {
/* to USP */
sprintf(operand_s, "A%i,USP", word & 0x0007);
} else {
/* from USP */
sprintf(operand_s, "USP,A%i", word & 0x0007);
}
decoded = true;
} break;
case 48 : {/* MOVEA */
const int smode = getmode(word);
const int sreg = word & 0x0007;
int size = (word & 0x3000) >> 12;
/* 2 = L, 3 = W */
if (size <= 1) break;
if (size == 3) size = 1;
/* 1 = W, 2 = L */
const int dreg = (word & 0x0e00) >> 9;
sprintf(opcode_s, "MOVEA.%c", size_arr[size]);
char source_s[50];
sprintmode(smode, sreg, size, source_s);
sprintf(operand_s, "%s,A%i", source_s, dreg);
decoded = true;
} break;
case 49 : {/* MOVEM */
const int dmode = getmode(word);
const int dreg = word & 0x0007;
const int size = ((word & 0x0040) >> 6) + 1;
if ((dmode == 0) || (dmode == 1)) break;
if (dmode >= 11) break;
const int dir = (word & 0x0400) >> 10; /* 1 == from mem */
if ((dir == 0) && (dmode == 3)) break;
if ((dir == 1) && (dmode == 4)) break;
const int data = getword();
if (dmode == 4) { /* dir == 0 if dmode == 4 !! */
/* reverse bits in data */
int temp = data;
int data = 0;
for (int i = 0; i <= 15; ++i) {
data = (data >> 1) | (temp & 0x8000);
temp = temp << 1;
}
}
char source_s[50] = "";
char dest_s[50] = "";
/**** DATA LIST ***/
int rlist[11];
for (int i = 0 ; i <= 7; ++i) {
rlist[i + 1] = (data >> i) & 0x0001;
}
rlist[0] = 0;
rlist[9] = 0;
rlist[10] = 0;
for (int i = 1; i <= 8 ; ++i) {
if ((rlist[i-1] == 0) && (rlist[i] == 1) &&
(rlist[i+1] == 1) && (rlist[i+2] == 1)) {
/* first reg in list */
char temp_s[50];
sprintf(temp_s, "D%i-", i - 1);
strcat(source_s, temp_s);
}
if ((rlist[i] == 1) && (rlist[i+1] == 0)) {
char temp_s[50];
sprintf(temp_s, "D%i,", i-1);
strcat(source_s, temp_s);
}
if ((rlist[i-1] == 0) && (rlist[i] == 1) &&
(rlist[i+1] == 1) && (rlist[i+2] == 0)) {
char temp_s[50];
sprintf(temp_s, "D%i,", i-1);
strcat(source_s, temp_s);
}
}
/**** ADDRESS LIST ***/
for (int i = 8; i <= 15; ++i) {
rlist[i - 7] = (data >> i) & 0x0001;
}
rlist[0] = 0;
rlist[9] = 0;
rlist[10] = 0;
for (int i = 1; i <= 8; ++i) {
if ((rlist[i-1] == 0) && (rlist[i] == 1) &&
(rlist[i+1] == 1) && (rlist[i+2] == 1)) {
/* first reg in list */
char temp_s[50];
sprintf(temp_s, "A%i-", i - 1);
strcat(source_s, temp_s);
}