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Thu Jan 7 13:15:17 1993 Ian Lance Taylor (ian@tweedledumb.cygnus.com)
* mips-dis.c: New file, from gdb/mips-pinsn.c. * Makefile.in (DIS_LIBS): Added mips-dis.o. (CFILES): Added mips-dis.c.
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Ian Lance Taylor
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181
opcodes/mips-dis.c
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181
opcodes/mips-dis.c
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/* Print mips instructions for GDB, the GNU debugger, or for objdump.
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Copyright 1989, 1991, 1992 Free Software Foundation, Inc.
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Contributed by Nobuyuki Hikichi(hikichi@sra.co.jp).
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "sysdep.h"
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#include <stdio.h>
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#include "bfd.h"
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#include "opcode/mips.h"
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/* FIXME: we need direct access to the swapping functions. */
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#include "libbfd.h"
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/* We use bfd_vma in a couple of places where gdb expects CORE_ADDR. */
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#ifdef HOST_64_BIT
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#error FIXME: bfd_vma will not match gdb expectations
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#endif
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/* This file is used both by gdb and by objdump. A program which
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wants to use this code must provide an external function
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print_address. */
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extern int print_address PARAMS ((bfd_vma, FILE *));
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/* Mips instructions are never longer than this many bytes. */
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#define MAXLEN 4
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/* Number of elements in the opcode table. */
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#define NOPCODES (sizeof mips_opcodes / sizeof mips_opcodes[0])
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/* FIXME: This should be shared with gdb somehow. */
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#define REGISTER_NAMES \
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{ "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
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"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
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"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
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"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \
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"sr", "lo", "hi", "bad", "cause","pc", \
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
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"fsr", "fir", "fp", "inx", "rand", "tlblo","ctxt", "tlbhi",\
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"epc", "prid"\
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}
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static CONST char * CONST reg_names[] = REGISTER_NAMES;
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/* subroutine */
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static unsigned char *
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print_insn_arg (d, l, stream, pc)
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char *d;
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register unsigned long int *l;
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FILE *stream;
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bfd_vma pc;
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{
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switch (*d)
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{
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case ',':
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case '(':
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case ')':
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fputc (*d, stream);
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break;
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case 's':
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fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rs]);
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break;
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case 't':
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fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rt]);
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break;
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case 'i':
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fprintf (stream, "%d", ((struct op_i_fmt *) l)->immediate);
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break;
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case 'j': /* same as i, but sign-extended */
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fprintf (stream, "%d", ((struct op_b_fmt *) l)->delta);
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break;
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case 'a':
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print_address ((pc & 0xF0000000) | (((struct op_j_fmt *)l)->target << 2),
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stream);
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break;
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case 'b':
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print_address ((((struct op_b_fmt *) l)->delta << 2) + pc + 4, stream);
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break;
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case 'd':
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fprintf (stream, "$%s", reg_names[((struct op_r_fmt *) l)->rd]);
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break;
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case 'h':
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fprintf (stream, "0x%x", ((struct op_r_fmt *) l)->shamt);
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break;
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case 'B':
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fprintf (stream, "0x%x", ((struct op_brk_fmt *) l)->code);
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break;
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case 'S':
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fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fs);
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break;
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case 'T':
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fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->ft);
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break;
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case 'D':
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fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fd);
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break;
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default:
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fprintf (stream, "# internal error, undefined modifier(%c)", *d);
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break;
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}
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}
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/* Print the mips instruction at address MEMADDR in debugged memory,
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on STREAM. Returns length of the instruction, in bytes, which is
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always 4. BIGENDIAN must be 1 if this is big-endian code, 0 if
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this is little-endian code. */
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int
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print_insn_mips (memaddr, buffer, stream, bigendian)
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bfd_vma memaddr;
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bfd_byte *buffer;
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FILE *stream;
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int bigendian;
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{
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register int i;
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register char *d;
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unsigned long int l;
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/* FIXME: can't we export these functions from bfd? */
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if (bigendian)
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l = _do_getb32 (buffer);
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else
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l = _do_getl32 (buffer);
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for (i = 0; i < NOPCODES; i++)
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{
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register unsigned int opcode = mips_opcodes[i].opcode;
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register unsigned int match = mips_opcodes[i].match;
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if ((l & match) == opcode)
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break;
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}
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/* Handle undefined instructions. */
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if (i == NOPCODES)
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{
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fprintf (stream, "0x%x",l);
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return 4;
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}
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fprintf (stream, "%s", mips_opcodes[i].name);
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if (!(d = mips_opcodes[i].args))
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return 4;
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fputc (' ', stream);
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while (*d)
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print_insn_arg (d++, &l, stream, memaddr);
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return 4;
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}
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