Commit | Line | Data |
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7d9884b9 JG |
1 | /* Print instructions for Tahoe target machines, for GDB. |
2 | Copyright 1986, 1989, 1991 Free Software Foundation, Inc. | |
3 | Contributed by the State University of New York at Buffalo, by the | |
4 | Distributed Computer Systems Lab, Department of Computer Science, 1991. | |
cb173f45 | 5 | |
7d9884b9 JG |
6 | This file is part of GDB. |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
cb173f45 | 17 | |
7d9884b9 JG |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
21 | ||
22 | #include <stdio.h> | |
cb173f45 | 23 | #include "defs.h" |
cb173f45 | 24 | #include "symtab.h" |
0c540082 | 25 | #include "tahoe-opcode.h" |
cb173f45 JK |
26 | |
27 | /* Tahoe instructions are never longer than this. */ | |
28 | #define MAXLEN 62 | |
29 | ||
30 | /* Number of elements in the opcode table. */ | |
31 | #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) | |
32 | ||
33 | extern char *reg_names[]; | |
34 | ||
35 | static unsigned char *print_insn_arg (); | |
36 | ||
37 | /* Print the Tahoe instruction at address MEMADDR in debugged memory, | |
38 | on STREAM. Returns length of the instruction, in bytes. */ | |
39 | ||
40 | int | |
41 | print_insn (memaddr, stream) | |
42 | CORE_ADDR memaddr; | |
43 | FILE *stream; | |
44 | { | |
45 | unsigned char buffer[MAXLEN]; | |
46 | register int i; | |
47 | register unsigned char *p; | |
48 | register char *d; | |
49 | ||
50 | read_memory (memaddr, buffer, MAXLEN); | |
51 | ||
52 | for (i = 0; i < NOPCODES; i++) | |
53 | if (votstrs[i].detail.code == buffer[0] | |
54 | || votstrs[i].detail.code == *(unsigned short *)buffer) | |
55 | break; | |
56 | ||
57 | /* Handle undefined instructions. */ | |
58 | if (i == NOPCODES) | |
59 | { | |
60 | fprintf (stream, "0%o", buffer[0]); | |
61 | return 1; | |
62 | } | |
63 | ||
64 | fprintf (stream, "%s", votstrs[i].name); | |
65 | ||
66 | /* Point at first byte of argument data, | |
67 | and at descriptor for first argument. */ | |
68 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); | |
69 | d = votstrs[i].detail.args; | |
70 | ||
71 | if (*d) | |
72 | fputc ('\t', stream); | |
73 | ||
74 | while (*d) | |
75 | { | |
76 | p = print_insn_arg (d, p, memaddr + (p - buffer), stream); | |
77 | d += 2; | |
78 | if (*d) | |
79 | fprintf (stream, ","); | |
80 | } | |
81 | return p - buffer; | |
82 | } | |
83 | /*******************************************************************/ | |
84 | static unsigned char * | |
85 | print_insn_arg (d, p, addr, stream) | |
86 | char *d; | |
87 | register char *p; | |
88 | CORE_ADDR addr; | |
89 | FILE *stream; | |
90 | { | |
91 | int temp1 = 0; | |
92 | register int regnum = *p & 0xf; | |
93 | float floatlitbuf; | |
94 | ||
95 | if (*d == 'b') | |
96 | { | |
97 | if (d[1] == 'b') | |
98 | fprintf (stream, "0x%x", addr + *p++ + 1); | |
99 | else | |
100 | { | |
101 | ||
102 | temp1 = *p; | |
103 | temp1 <<= 8; | |
104 | temp1 |= *(p + 1); | |
105 | fprintf (stream, "0x%x", addr + temp1 + 2); | |
106 | p += 2; | |
107 | } | |
108 | } | |
109 | else | |
110 | switch ((*p++ >> 4) & 0xf) | |
111 | { | |
112 | case 0: | |
113 | case 1: | |
114 | case 2: | |
7d9884b9 | 115 | case 3: /* Literal (short immediate byte) mode */ |
cb173f45 JK |
116 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') |
117 | { | |
118 | *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); | |
119 | fprintf (stream, "$%f", floatlitbuf); | |
120 | } | |
121 | else | |
122 | fprintf (stream, "$%d", p[-1] & 0x3f); | |
123 | break; | |
124 | ||
125 | case 4: /* Indexed */ | |
126 | p = (char *) print_insn_arg (d, p, addr + 1, stream); | |
127 | fprintf (stream, "[%s]", reg_names[regnum]); | |
128 | break; | |
129 | ||
130 | case 5: /* Register */ | |
131 | fprintf (stream, reg_names[regnum]); | |
132 | break; | |
133 | ||
134 | case 7: /* Autodecrement */ | |
135 | fputc ('-', stream); | |
136 | case 6: /* Register deferred */ | |
137 | fprintf (stream, "(%s)", reg_names[regnum]); | |
138 | break; | |
139 | ||
140 | case 9: /* Absolute Address & Autoincrement deferred */ | |
141 | fputc ('*', stream); | |
142 | if (regnum == PC_REGNUM) | |
143 | { | |
144 | temp1 = *p; | |
145 | temp1 <<= 8; | |
146 | temp1 |= *(p +1); | |
147 | ||
148 | fputc ('$', stream); | |
149 | print_address (temp1, stream); | |
150 | p += 4; | |
151 | break; | |
152 | } | |
153 | case 8: /*Immediate & Autoincrement SP */ | |
154 | if (regnum == 8) /*88 is Immediate Byte Mode*/ | |
155 | fprintf (stream, "$%d", *p++); | |
156 | ||
157 | else if (regnum == 9) /*89 is Immediate Word Mode*/ | |
158 | { | |
159 | temp1 = *p; | |
160 | temp1 <<= 8; | |
161 | temp1 |= *(p +1); | |
162 | fprintf (stream, "$%d", temp1); | |
163 | p += 2; | |
164 | } | |
165 | ||
166 | else if (regnum == PC_REGNUM) /*8F is Immediate Long Mode*/ | |
167 | { | |
168 | temp1 = *p; | |
169 | temp1 <<=8; | |
170 | temp1 |= *(p +1); | |
171 | temp1 <<=8; | |
172 | temp1 |= *(p +2); | |
173 | temp1 <<= 8; | |
174 | temp1 |= *(p +3); | |
175 | fprintf (stream, "$%d", temp1); | |
176 | p += 4; | |
177 | } | |
178 | ||
179 | else /*8E is Autoincrement SP Mode*/ | |
180 | fprintf (stream, "(%s)+", reg_names[regnum]); | |
181 | break; | |
182 | ||
183 | case 11: /* Register + Byte Displacement Deferred Mode*/ | |
184 | fputc ('*', stream); | |
185 | case 10: /* Register + Byte Displacement Mode*/ | |
186 | if (regnum == PC_REGNUM) | |
187 | print_address (addr + *p + 2, stream); | |
188 | else | |
189 | fprintf (stream, "%d(%s)", *p, reg_names[regnum]); | |
190 | p += 1; | |
191 | break; | |
192 | ||
193 | case 13: /* Register + Word Displacement Deferred Mode*/ | |
194 | fputc ('*', stream); | |
195 | case 12: /* Register + Word Displacement Mode*/ | |
196 | temp1 = *p; | |
197 | temp1 <<= 8; | |
198 | temp1 |= *(p +1); | |
199 | if (regnum == PC_REGNUM) | |
200 | print_address (addr + temp1 + 3, stream); | |
201 | else | |
202 | fprintf (stream, "%d(%s)", temp1, reg_names[regnum]); | |
203 | p += 2; | |
204 | break; | |
205 | ||
206 | case 15: /* Register + Long Displacement Deferred Mode*/ | |
207 | fputc ('*', stream); | |
208 | case 14: /* Register + Long Displacement Mode*/ | |
209 | temp1 = *p; | |
210 | temp1 <<= 8; | |
211 | temp1 |= *(p +1); | |
212 | temp1 <<= 8; | |
213 | temp1 |= *(p +2); | |
214 | temp1 <<= 8; | |
215 | temp1 |= *(p +3); | |
216 | if (regnum == PC_REGNUM) | |
217 | print_address (addr + temp1 + 5, stream); | |
218 | else | |
219 | fprintf (stream, "%d(%s)", temp1, reg_names[regnum]); | |
220 | p += 4; | |
221 | } | |
222 | ||
223 | return (unsigned char *) p; | |
224 | } | |
225 | ||
226 | ||
227 | ||
228 | ||
229 | ||
230 | ||
231 | ||
232 | ||
233 | ||
234 | ||
235 | ||
236 | ||
237 |