275 lines
7.0 KiB
C
275 lines
7.0 KiB
C
/* Print instructions for Tahoe target machines, for GDB.
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Copyright 1986, 1989, 1991, 1992 Free Software Foundation, Inc.
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Contributed by the State University of New York at Buffalo, by the
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Distributed Computer Systems Lab, Department of Computer Science, 1991.
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This file is part of GDB.
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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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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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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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#include "defs.h"
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#include "symtab.h"
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#include "opcode/tahoe.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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static unsigned char *print_insn_arg ();
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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CORE_ADDR
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tahoe_skip_prologue (pc)
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CORE_ADDR pc;
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{
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register int op = (unsigned char) read_memory_integer (pc, 1);
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if (op == 0x11)
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pc += 2; /* skip brb */
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if (op == 0x13)
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pc += 3; /* skip brw */
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if (op == 0x2c
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&& ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5e)
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pc += 3; /* skip subl2 */
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if (op == 0xe9
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&& ((unsigned char) read_memory_integer (pc+1, 1)) == 0xae
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&& ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5e)
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pc += 4; /* skip movab */
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if (op == 0xe9
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&& ((unsigned char) read_memory_integer (pc+1, 1)) == 0xce
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&& ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5e)
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pc += 5; /* skip movab */
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if (op == 0xe9
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&& ((unsigned char) read_memory_integer (pc+1, 1)) == 0xee
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&& ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5e)
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pc += 7; /* skip movab */
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return pc;
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}
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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int
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tahoe_frame_num_args (fi)
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struct frame_info *fi;
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{
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return (((0xffff & read_memory_integer(((fi)->frame-4),4)) - 4) >> 2);
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}
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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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tahoe_print_insn (memaddr, stream)
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CORE_ADDR memaddr;
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GDB_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_unfiltered (stream, "0%o", buffer[0]);
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return 1;
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}
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fprintf_unfiltered (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_unfiltered ('\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_unfiltered (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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GDB_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_unfiltered (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_unfiltered (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: /* Literal (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_unfiltered (stream, "$%f", floatlitbuf);
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}
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else
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fprintf_unfiltered (stream, "$%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_unfiltered (stream, "[%s]", REGISTER_NAME (regnum));
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break;
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case 5: /* Register */
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fprintf_unfiltered (stream, REGISTER_NAME (regnum));
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break;
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case 7: /* Autodecrement */
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fputc_unfiltered ('-', stream);
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case 6: /* Register deferred */
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fprintf_unfiltered (stream, "(%s)", REGISTER_NAME (regnum));
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break;
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case 9: /* Absolute Address & Autoincrement deferred */
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fputc_unfiltered ('*', 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_unfiltered ('$', stream);
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print_address (temp1, stream);
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p += 4;
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break;
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}
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case 8: /*Immediate & Autoincrement SP */
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if (regnum == 8) /*88 is Immediate Byte Mode*/
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fprintf_unfiltered (stream, "$%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_unfiltered (stream, "$%d", temp1);
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p += 2;
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}
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else if (regnum == PC_REGNUM) /*8F is Immediate Long Mode*/
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{
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temp1 = *p;
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temp1 <<=8;
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temp1 |= *(p +1);
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temp1 <<=8;
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temp1 |= *(p +2);
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temp1 <<= 8;
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temp1 |= *(p +3);
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fprintf_unfiltered (stream, "$%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_unfiltered (stream, "(%s)+", REGISTER_NAME (regnum));
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break;
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case 11: /* Register + Byte Displacement Deferred Mode*/
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fputc_unfiltered ('*', 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_unfiltered (stream, "%d(%s)", *p, REGISTER_NAME (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_unfiltered ('*', 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_unfiltered (stream, "%d(%s)", temp1, REGISTER_NAME (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_unfiltered ('*', 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_unfiltered (stream, "%d(%s)", temp1, REGISTER_NAME (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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