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