A ton of changes to improve C++ debugging. See ChangeLog.
[deliverable/binutils-gdb.git] / gdb / mips-pinsn.c
1 /* Print mips instructions for GDB, the GNU debugger.
2 Copyright 1989, 1991, 1992 Free Software Foundation, Inc.
3 Contributed by Nobuyuki Hikichi(hikichi@sra.co.jp).
4
5 This file is part of GDB.
6
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.
11
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.
16
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. */
20
21 #include "defs.h"
22 #include "symtab.h"
23 #include "opcode/mips.h"
24
25 /* Mips instructions are never longer than this many bytes. */
26 #define MAXLEN 4
27
28 /* Number of elements in the opcode table. */
29 #define NOPCODES (sizeof mips_opcodes / sizeof mips_opcodes[0])
30
31 #define MKLONG(p) *(unsigned long*)p
32 \f
33 /* subroutine */
34 static unsigned char *
35 print_insn_arg (d, l, stream, pc)
36 char *d;
37 register unsigned long int *l;
38 FILE *stream;
39 CORE_ADDR pc;
40 {
41 switch (*d)
42 {
43 case ',':
44 case '(':
45 case ')':
46 fputc (*d, stream);
47 break;
48
49 case 's':
50 fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rs]);
51 break;
52
53 case 't':
54 fprintf (stream, "$%s", reg_names[((struct op_i_fmt *) l)->rt]);
55 break;
56
57 case 'i':
58 fprintf (stream, "%d", ((struct op_i_fmt *) l)->immediate);
59 break;
60
61 case 'j': /* same as i, but sign-extended */
62 fprintf (stream, "%d", ((struct op_b_fmt *) l)->delta);
63 break;
64
65 case 'a':
66 print_address ((pc & 0xF0000000) | (((struct op_j_fmt *)l)->target << 2),
67 stream);
68 break;
69
70 case 'b':
71 print_address ((((struct op_b_fmt *) l)->delta << 2) + pc + 4, stream);
72 break;
73
74 case 'd':
75 fprintf (stream, "$%s", reg_names[((struct op_r_fmt *) l)->rd]);
76 break;
77
78 case 'h':
79 fprintf (stream, "0x%x", ((struct op_r_fmt *) l)->shamt);
80 break;
81
82 case 'S':
83 fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fs);
84 break;
85
86 case 'T':
87 fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->ft);
88 break;
89
90 case 'D':
91 fprintf (stream, "$f%d", ((struct fop_r_fmt *) l)->fd);
92 break;
93
94 default:
95 fprintf (stream, "# internal error, undefined modifier(%c)", *d);
96 break;
97 }
98 }
99 \f
100 /* Print the mips instruction at address MEMADDR in debugged memory,
101 on STREAM. Returns length of the instruction, in bytes, which
102 is always 4. */
103
104 int
105 print_insn (memaddr, stream)
106 CORE_ADDR memaddr;
107 FILE *stream;
108 {
109 unsigned char buffer[MAXLEN];
110 register int i;
111 register char *d;
112 unsigned long int l;
113
114 read_memory (memaddr, buffer, MAXLEN);
115 SWAP_TARGET_AND_HOST (buffer, MAXLEN);
116
117 for (i = 0; i < NOPCODES; i++)
118 {
119 register unsigned int opcode = mips_opcodes[i].opcode;
120 register unsigned int match = mips_opcodes[i].match;
121 if ((*(unsigned int*)buffer & match) == opcode)
122 break;
123 }
124
125 l = MKLONG (buffer);
126 /* Handle undefined instructions. */
127 if (i == NOPCODES)
128 {
129 fprintf (stream, "0x%x",l);
130 return 4;
131 }
132
133 fprintf (stream, "%s", mips_opcodes[i].name);
134
135 if (!(d = mips_opcodes[i].args))
136 return 4;
137
138 fputc (' ', stream);
139
140 while (*d)
141 print_insn_arg (d++, &l, stream, memaddr);
142
143 return 4;
144 }
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