- unsigned char buffer[MAXLEN];
- register int i;
- register unsigned char *p;
- register char *d;
- register int bestmask;
- int best;
-
- read_memory (memaddr, buffer, MAXLEN);
-
- bestmask = 0;
- best = -1;
- for (i = 0; i < NOPCODES; i++)
- {
- register unsigned int opcode = m68k_opcodes[i].opcode;
- register unsigned int match = m68k_opcodes[i].match;
- if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24)))
- && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16)))
- && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8)))
- && ((0xff & buffer[3] & match) == (0xff & opcode)))
- {
- /* Don't use for printout the variants of divul and divsl
- that have the same register number in two places.
- The more general variants will match instead. */
- for (d = m68k_opcodes[i].args; *d; d += 2)
- if (d[1] == 'D')
- break;
-
- /* Don't use for printout the variants of most floating
- point coprocessor instructions which use the same
- register number in two places, as above. */
- if (*d == 0)
- for (d = m68k_opcodes[i].args; *d; d += 2)
- if (d[1] == 't')
- break;
-
- if (*d == 0 && match > bestmask)
- {
- best = i;
- bestmask = match;
- }
- }
- }
-
- /* Handle undefined instructions. */
- if (best < 0)
- {
- fprintf_filtered (stream, "0%o", (buffer[0] << 8) + buffer[1]);
- return 2;
- }
-
- fprintf_filtered (stream, "%s", m68k_opcodes[best].name);
-
- /* Point at first word of argument data,
- and at descriptor for first argument. */
- p = buffer + 2;
-
- /* Why do this this way? -MelloN */
- for (d = m68k_opcodes[best].args; *d; d += 2)
- {
- if (d[0] == '#')
- {
- if (d[1] == 'l' && p - buffer < 6)
- p = buffer + 6;
- else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' )
- p = buffer + 4;
- }
- if (d[1] >= '1' && d[1] <= '3' && p - buffer < 4)
- p = buffer + 4;
- if (d[1] >= '4' && d[1] <= '6' && p - buffer < 6)
- p = buffer + 6;
- if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4)
- p = buffer + 4;
- }
-
- d = m68k_opcodes[best].args;
-
- if (*d)
- fputs_filtered (" ", stream);
-
- while (*d)
- {
- p = print_insn_arg (d, buffer, p, memaddr + p - buffer, stream);
- d += 2;
- if (*d && *(d - 2) != 'I' && *d != 'k')
- fputs_filtered (",", stream);
- }
- return p - buffer;
-}
-
-static unsigned char *
-print_insn_arg (d, buffer, p, addr, stream)
- char *d;
- unsigned char *buffer;
- register unsigned char *p;
- CORE_ADDR addr; /* PC for this arg to be relative to */
- FILE *stream;
-{
- register int val;
- register int place = d[1];
- int regno;
- register char *regname;
- register unsigned char *p1;
- register double flval;
- int flt_p;
-
- switch (*d)
- {
- case 'C':
- fprintf_filtered (stream, "ccr");
- break;
-
- case 'S':
- fprintf_filtered (stream, "sr");
- break;
-
- case 'U':
- fprintf_filtered (stream, "usp");
- break;
-
- case 'J':
- {
- static struct { char *name; int value; } names[]
- = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002},
- {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802},
- {"msp", 0x803}, {"isp", 0x804}};
-
- val = fetch_arg (buffer, place, 12);
- for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
- if (names[regno].value == val)
- {
- fprintf_filtered (stream, names[regno].name);
- break;
- }
- if (regno < 0)
- fprintf_filtered (stream, "%d", val);
- }
- break;
-
- case 'Q':
- val = fetch_arg (buffer, place, 3);
- /* 0 means 8, except for the bkpt instruction... */
- if (val == 0 && d[1] != 's')
- val = 8;
- fprintf_filtered (stream, "#%d", val);
- break;
-
- case 'M':
- val = fetch_arg (buffer, place, 8);
- if (val & 0x80)
- val = val - 0x100;
- fprintf_filtered (stream, "#%d", val);
- break;
-
- case 'T':
- val = fetch_arg (buffer, place, 4);
- fprintf_filtered (stream, "#%d", val);
- break;
-
- case 'D':
- fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 3)]);
- break;
-
- case 'A':
- fprintf_filtered (stream, "%s",
- reg_names[fetch_arg (buffer, place, 3) + 010]);
- break;
-
- case 'R':
- fprintf_filtered (stream, "%s", reg_names[fetch_arg (buffer, place, 4)]);
- break;
-
- case 'F':
- fprintf_filtered (stream, "fp%d", fetch_arg (buffer, place, 3));
- break;
-
- case 'O':
- val = fetch_arg (buffer, place, 6);
- if (val & 0x20)
- fprintf_filtered (stream, "%s", reg_names [val & 7]);
- else
- fprintf_filtered (stream, "%d", val);
- break;
-
- case '+':
- fprintf_filtered (stream, "%s@+",
- reg_names[fetch_arg (buffer, place, 3) + 8]);
- break;
-
- case '-':
- fprintf_filtered (stream, "%s@-",
- reg_names[fetch_arg (buffer, place, 3) + 8]);
- break;
-
- case 'k':
- if (place == 'k')
- fprintf_filtered (stream, "{%s}", reg_names[fetch_arg (buffer, place, 3)]);
- else if (place == 'C')
- {
- val = fetch_arg (buffer, place, 7);
- if ( val > 63 ) /* This is a signed constant. */
- val -= 128;
- fprintf_filtered (stream, "{#%d}", val);
- }
- else
- error ("Invalid arg format in opcode table: \"%c%c\".",
- *d, place);
- break;
-
- case '#':
- case '^':
- p1 = buffer + (*d == '#' ? 2 : 4);
- if (place == 's')
- val = fetch_arg (buffer, place, 4);
- else if (place == 'C')
- val = fetch_arg (buffer, place, 7);
- else if (place == '8')
- val = fetch_arg (buffer, place, 3);
- else if (place == '3')
- val = fetch_arg (buffer, place, 8);
- else if (place == 'b')
- val = NEXTBYTE (p1);
- else if (place == 'w')
- val = NEXTWORD (p1);
- else if (place == 'l')
- val = NEXTLONG (p1);
- else
- error ("Invalid arg format in opcode table: \"%c%c\".",
- *d, place);
- fprintf_filtered (stream, "#%d", val);
- break;
-
- case 'B':
- if (place == 'b')
- val = NEXTBYTE (p);
- else if (place == 'w')
- val = NEXTWORD (p);
- else if (place == 'l')
- val = NEXTLONG (p);
- else if (place == 'g')
- {
- val = ((char *)buffer)[1];
- if (val == 0)
- val = NEXTWORD (p);
- else if (val == -1)
- val = NEXTLONG (p);
- }
- else if (place == 'c')
- {
- if (buffer[1] & 0x40) /* If bit six is one, long offset */
- val = NEXTLONG (p);
- else
- val = NEXTWORD (p);
- }
- else
- error ("Invalid arg format in opcode table: \"%c%c\".",
- *d, place);
-
- print_address (addr + val, stream);
- break;
-
- case 'd':
- val = NEXTWORD (p);
- fprintf_filtered (stream, "%s@(%d)",
- reg_names[fetch_arg (buffer, place, 3)], val);
- break;
-
- case 's':
- fprintf_filtered (stream, "%s",
- fpcr_names[fetch_arg (buffer, place, 3)]);
- break;
-
- case 'I':
- val = fetch_arg (buffer, 'd', 3); /* Get coprocessor ID... */
- if (val != 1) /* Unusual coprocessor ID? */
- fprintf_filtered (stream, "(cpid=%d) ", val);
- if (place == 'i')
- p += 2; /* Skip coprocessor extended operands */
- break;
-
- case '*':
- case '~':
- case '%':
- case ';':
- case '@':
- case '!':
- case '$':
- case '?':
- case '/':
- case '&':
-
- if (place == 'd')
- {
- val = fetch_arg (buffer, 'x', 6);
- val = ((val & 7) << 3) + ((val >> 3) & 7);
- }
- else
- val = fetch_arg (buffer, 's', 6);
-
- /* Get register number assuming address register. */
- regno = (val & 7) + 8;
- regname = reg_names[regno];
- switch (val >> 3)
- {
- case 0:
- fprintf_filtered (stream, "%s", reg_names[val]);
- break;
-
- case 1:
- fprintf_filtered (stream, "%s", regname);
- break;
-
- case 2:
- fprintf_filtered (stream, "%s@", regname);
- break;
-
- case 3:
- fprintf_filtered (stream, "%s@+", regname);
- break;
-
- case 4:
- fprintf_filtered (stream, "%s@-", regname);
- break;
-
- case 5:
- val = NEXTWORD (p);
- fprintf_filtered (stream, "%s@(%d)", regname, val);
- break;