149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/* Print mips instructions for GDB, the GNU debugger.
|
||
Copyright 1989, 1991 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 "symtab.h"
|
||
#include "opcode/mips.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;
|
||
}
|