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/* Print mips instructions for GDB, the GNU debugger.
Copyright (C) 1989 Free Software Foundation, Inc.
Contributed by Nobuyuki Hikichi(hikichi@sra.co.jp)
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "defs.h"
#include "param.h"
#include "symtab.h"
#include "mips-opcode.h"
/* Mips instructions are never longer than this many bytes. */
#define MAXLEN 4
/* Number of elements in the opcode table. */
#define NOPCODES (sizeof mips_opcodes / sizeof mips_opcodes[0])
#define MKLONG(p) *(unsigned long*)p
extern char *reg_names[];
/* subroutine */
static unsigned char *
print_insn_arg (d, l, stream, pc)
char *d;
register unsigned long int *l;
FILE *stream;
CORE_ADDR pc;
{
switch (*d)
{
case ',':
case '(':
case ')':
fputc (*d, stream);
break;
case 's':
fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rs]);
break;
case 't':
fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rt]);
break;
case 'i':
fprintf (stream, "%d", ((struct op_i_fmt *) l)->immediate);
break;
case 'j': /* same as i, but sign-extended */
fprintf (stream, "%d", ((struct op_b_fmt *) l)->delta);
break;
case 'a':
print_address ((pc & 0xF0000000) | (((struct op_j_fmt *)l)->target << 2),
stream);
break;
case 'b':
print_address ((((struct op_b_fmt *) l)->delta << 2) + pc + 4, stream);
break;
case 'd':
fprintf (stream, "%s", reg_names[((struct op_r_fmt *) l)->rd]);
break;
case 'h':
fprintf (stream, "0x%x", ((struct op_r_fmt *) l)->shamt);
break;
case 'S':
fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fs);
break;
case 'T':
fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->ft);
break;
case 'D':
fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fd);
break;
default:
fprintf (stream, "# internal error, undefined modifier(%c)", *d);
break;
}
}
/* Print the mips instruction at address MEMADDR in debugged memory,
on STREAM. Returns length of the instruction, in bytes, which
is always 4. */
int
print_insn (memaddr, stream)
CORE_ADDR memaddr;
FILE *stream;
{
unsigned char buffer[MAXLEN];
register int i;
register char *d;
unsigned long int l;
read_memory (memaddr, buffer, MAXLEN);
for (i = 0; i < NOPCODES; i++)
{
register unsigned int opcode = mips_opcodes[i].opcode;
register unsigned int match = mips_opcodes[i].match;
if ((*(unsigned int*)buffer & match) == opcode)
break;
}
l = MKLONG (buffer);
/* Handle undefined instructions. */
if (i == NOPCODES)
{
fprintf (stream, "0x%x",l);
return 4;
}
fprintf (stream, "%s", mips_opcodes[i].name);
if (!(d = mips_opcodes[i].args))
return 4;
fputc (' ', stream);
while (*d)
print_insn_arg (d++, &l, stream, memaddr);
return 4;
}
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