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- /*-
- * Copyright (c) 1991 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by the
- * Distributed Computer Systems Lab, Department of Computer Science
- * at the State University of New York at Buffalo.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)tahoe-pinsn.c 6.3 (Berkeley) 5/8/91";
- #endif /* not lint */
-
- #include <stdio.h>
-
- #include "defs.h"
- #include "param.h"
- #include "symtab.h"
- #include "tahoe-opcode.h"
-
- /* Tahoe instructions are never longer than this. */
- #define MAXLEN 62
-
- /* Number of elements in the opcode table. */
- #define NOPCODES (sizeof votstrs / sizeof votstrs[0])
-
- extern char *reg_names[];
-
- static unsigned char *print_insn_arg ();
-
- /* Print the Tahoe instruction at address MEMADDR in debugged memory,
- on STREAM. Returns length of the instruction, in bytes. */
-
- int
- print_insn (memaddr, stream)
- CORE_ADDR memaddr;
- FILE *stream;
- {
- unsigned char buffer[MAXLEN];
- register int i;
- register unsigned char *p;
- register char *d;
-
- read_memory (memaddr, buffer, MAXLEN);
-
- for (i = 0; i < NOPCODES; i++)
- if (votstrs[i].detail.code == buffer[0]
- || votstrs[i].detail.code == *(unsigned short *)buffer)
- break;
-
- /* Handle undefined instructions. */
- if (i == NOPCODES)
- {
- fprintf (stream, "0%o", buffer[0]);
- return 1;
- }
-
- fprintf (stream, "%s", votstrs[i].name);
-
- /* Point at first byte of argument data,
- and at descriptor for first argument. */
- p = buffer + 1 + (votstrs[i].detail.code >= 0x100);
- d = votstrs[i].detail.args;
-
- if (*d)
- fputc ('\t', stream);
-
- while (*d)
- {
- p = print_insn_arg (d, p, memaddr + (p - buffer), stream);
- d += 2;
- if (*d)
- fprintf (stream, ",");
- }
- return p - buffer;
- }
- /*******************************************************************/
- static unsigned char *
- print_insn_arg (d, p, addr, stream)
- char *d;
- register char *p;
- CORE_ADDR addr;
- FILE *stream;
- {
- int temp1 = 0;
- register int regnum = *p & 0xf;
- float floatlitbuf;
-
- if (*d == 'b')
- {
- if (d[1] == 'b')
- fprintf (stream, "0x%x", addr + *p++ + 1);
- else
- {
-
- temp1 = *p;
- temp1 <<= 8;
- temp1 |= *(p + 1);
- fprintf (stream, "0x%x", addr + temp1 + 2);
- p += 2;
- }
- }
- else
- switch ((*p++ >> 4) & 0xf)
- {
- case 0:
- case 1:
- case 2:
- case 3: /* Liter>al(short immediate byte) mode */
- if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h')
- {
- *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4);
- fprintf (stream, "$%f", floatlitbuf);
- }
- else
- fprintf (stream, "$%d", p[-1] & 0x3f);
- break;
-
- case 4: /* Indexed */
- p = (char *) print_insn_arg (d, p, addr + 1, stream);
- fprintf (stream, "[%s]", reg_names[regnum]);
- break;
-
- case 5: /* Register */
- fprintf (stream, reg_names[regnum]);
- break;
-
- case 7: /* Autodecrement */
- fputc ('-', stream);
- case 6: /* Register deferred */
- fprintf (stream, "(%s)", reg_names[regnum]);
- break;
-
- case 9: /* Absolute Address & Autoincrement deferred */
- fputc ('*', stream);
- if (regnum == PC_REGNUM)
- {
- temp1 = *p;
- temp1 <<= 8;
- temp1 |= *(p +1);
-
- fputc ('$', stream);
- print_address (temp1, stream);
- p += 4;
- break;
- }
- case 8: /*Immediate & Autoincrement SP */
- if (regnum == 8) /*88 is Immediate Byte Mode*/
- fprintf (stream, "$%d", *p++);
-
- else if (regnum == 9) /*89 is Immediate Word Mode*/
- {
- temp1 = *p;
- temp1 <<= 8;
- temp1 |= *(p +1);
- fprintf (stream, "$%d", temp1);
- p += 2;
- }
-
- else if (regnum == PC_REGNUM) /*8F is Immediate Long Mode*/
- {
- temp1 = *p;
- temp1 <<=8;
- temp1 |= *(p +1);
- temp1 <<=8;
- temp1 |= *(p +2);
- temp1 <<= 8;
- temp1 |= *(p +3);
- fprintf (stream, "$%d", temp1);
- p += 4;
- }
-
- else /*8E is Autoincrement SP Mode*/
- fprintf (stream, "(%s)+", reg_names[regnum]);
- break;
-
- case 11: /* Register + Byte Displacement Deferred Mode*/
- fputc ('*', stream);
- case 10: /* Register + Byte Displacement Mode*/
- if (regnum == PC_REGNUM)
- print_address (addr + *p + 2, stream);
- else
- fprintf (stream, "%d(%s)", *p, reg_names[regnum]);
- p += 1;
- break;
-
- case 13: /* Register + Word Displacement Deferred Mode*/
- fputc ('*', stream);
- case 12: /* Register + Word Displacement Mode*/
- temp1 = *p;
- temp1 <<= 8;
- temp1 |= *(p +1);
- if (regnum == PC_REGNUM)
- print_address (addr + temp1 + 3, stream);
- else
- fprintf (stream, "%d(%s)", temp1, reg_names[regnum]);
- p += 2;
- break;
-
- case 15: /* Register + Long Displacement Deferred Mode*/
- fputc ('*', stream);
- case 14: /* Register + Long Displacement Mode*/
- temp1 = *p;
- temp1 <<= 8;
- temp1 |= *(p +1);
- temp1 <<= 8;
- temp1 |= *(p +2);
- temp1 <<= 8;
- temp1 |= *(p +3);
- if (regnum == PC_REGNUM)
- print_address (addr + temp1 + 5, stream);
- else
- fprintf (stream, "%d(%s)", temp1, reg_names[regnum]);
- p += 4;
- }
-
- return (unsigned char *) p;
- }
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