1 /* Print mips instructions for GDB, the GNU debugger.
2 Copyright 1989, 1991 Free Software Foundation, Inc.
3 Contributed by Nobuyuki Hikichi(hikichi@sra.co.jp)
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #include "opcode/mips.h"
25 /* Mips instructions are never longer than this many bytes. */
28 /* Number of elements in the opcode table. */
29 #define NOPCODES (sizeof mips_opcodes / sizeof mips_opcodes[0])
31 #define MKLONG(p) *(unsigned long*)p
33 extern char *reg_names
[];
37 static unsigned char *
38 print_insn_arg (d
, l
, stream
, pc
)
40 register unsigned long int *l
;
53 fprintf (stream
, "$%s", reg_names
[((struct op_i_fmt
*) l
)->rs
]);
57 fprintf (stream
, "$%s", reg_names
[((struct op_i_fmt
*) l
)->rt
]);
61 fprintf (stream
, "%d", ((struct op_i_fmt
*) l
)->immediate
);
64 case 'j': /* same as i, but sign-extended */
65 fprintf (stream
, "%d", ((struct op_b_fmt
*) l
)->delta
);
69 print_address ((pc
& 0xF0000000) | (((struct op_j_fmt
*)l
)->target
<< 2),
74 print_address ((((struct op_b_fmt
*) l
)->delta
<< 2) + pc
+ 4, stream
);
78 fprintf (stream
, "$%s", reg_names
[((struct op_r_fmt
*) l
)->rd
]);
82 fprintf (stream
, "0x%x", ((struct op_r_fmt
*) l
)->shamt
);
86 fprintf (stream
, "$f%d", ((struct fop_r_fmt
*) l
)->fs
);
90 fprintf (stream
, "$f%d", ((struct fop_r_fmt
*) l
)->ft
);
94 fprintf (stream
, "$f%d", ((struct fop_r_fmt
*) l
)->fd
);
98 fprintf (stream
, "# internal error, undefined modifier(%c)", *d
);
103 /* Print the mips instruction at address MEMADDR in debugged memory,
104 on STREAM. Returns length of the instruction, in bytes, which
108 print_insn (memaddr
, stream
)
112 unsigned char buffer
[MAXLEN
];
117 read_memory (memaddr
, buffer
, MAXLEN
);
119 for (i
= 0; i
< NOPCODES
; i
++)
121 register unsigned int opcode
= mips_opcodes
[i
].opcode
;
122 register unsigned int match
= mips_opcodes
[i
].match
;
123 if ((*(unsigned int*)buffer
& match
) == opcode
)
128 /* Handle undefined instructions. */
131 fprintf (stream
, "0x%x",l
);
135 fprintf (stream
, "%s", mips_opcodes
[i
].name
);
137 if (!(d
= mips_opcodes
[i
].args
))
143 print_insn_arg (d
++, &l
, stream
, memaddr
);