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7d9884b9 JG |
1 | /* Print VAX instructions for GDB, the GNU debugger. |
2 | Copyright 1986, 1989, 1991 Free Software Foundation, Inc. | |
dd3b648e RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e | 19 | |
dd3b648e | 20 | #include "defs.h" |
dd3b648e | 21 | #include "symtab.h" |
aab77d5f | 22 | #include "opcode/vax.h" |
dd3b648e RP |
23 | |
24 | /* Vax instructions are never longer than this. */ | |
25 | #define MAXLEN 62 | |
26 | ||
27 | /* Number of elements in the opcode table. */ | |
28 | #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) | |
29 | ||
30 | extern char *reg_names[]; | |
31 | ||
32 | static unsigned char *print_insn_arg (); | |
33 | \f | |
34 | /* Print the vax instruction at address MEMADDR in debugged memory, | |
35 | on STREAM. Returns length of the instruction, in bytes. */ | |
36 | ||
37 | int | |
38 | print_insn (memaddr, stream) | |
39 | CORE_ADDR memaddr; | |
40 | FILE *stream; | |
41 | { | |
42 | unsigned char buffer[MAXLEN]; | |
43 | register int i; | |
44 | register unsigned char *p; | |
45 | register char *d; | |
46 | ||
47 | read_memory (memaddr, buffer, MAXLEN); | |
48 | ||
49 | for (i = 0; i < NOPCODES; i++) | |
50 | if (votstrs[i].detail.code == buffer[0] | |
51 | || votstrs[i].detail.code == *(unsigned short *)buffer) | |
52 | break; | |
53 | ||
54 | /* Handle undefined instructions. */ | |
55 | if (i == NOPCODES) | |
56 | { | |
57 | fprintf (stream, "0%o", buffer[0]); | |
58 | return 1; | |
59 | } | |
60 | ||
61 | fprintf (stream, "%s", votstrs[i].name); | |
62 | ||
63 | /* Point at first byte of argument data, | |
64 | and at descriptor for first argument. */ | |
65 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); | |
66 | d = votstrs[i].detail.args; | |
67 | ||
68 | if (*d) | |
69 | fputc (' ', stream); | |
70 | ||
71 | while (*d) | |
72 | { | |
73 | p = print_insn_arg (d, p, memaddr + (p - buffer), stream); | |
74 | d += 2; | |
75 | if (*d) | |
76 | fprintf (stream, ","); | |
77 | } | |
78 | return p - buffer; | |
79 | } | |
80 | ||
81 | static unsigned char * | |
82 | print_insn_arg (d, p, addr, stream) | |
83 | char *d; | |
84 | register char *p; | |
85 | CORE_ADDR addr; | |
86 | FILE *stream; | |
87 | { | |
88 | register int regnum = *p & 0xf; | |
89 | float floatlitbuf; | |
90 | ||
91 | if (*d == 'b') | |
92 | { | |
93 | if (d[1] == 'b') | |
94 | fprintf (stream, "0x%x", addr + *p++ + 1); | |
95 | else | |
96 | { | |
97 | fprintf (stream, "0x%x", addr + *(short *)p + 2); | |
98 | p += 2; | |
99 | } | |
100 | } | |
101 | else | |
102 | switch ((*p++ >> 4) & 0xf) | |
103 | { | |
104 | case 0: | |
105 | case 1: | |
106 | case 2: | |
107 | case 3: /* Literal mode */ | |
108 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') | |
109 | { | |
110 | *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); | |
111 | fprintf (stream, "$%f", floatlitbuf); | |
112 | } | |
113 | else | |
114 | fprintf (stream, "$%d", p[-1] & 0x3f); | |
115 | break; | |
116 | ||
117 | case 4: /* Indexed */ | |
118 | p = (char *) print_insn_arg (d, p, addr + 1, stream); | |
119 | fprintf (stream, "[%s]", reg_names[regnum]); | |
120 | break; | |
121 | ||
122 | case 5: /* Register */ | |
123 | fprintf (stream, reg_names[regnum]); | |
124 | break; | |
125 | ||
126 | case 7: /* Autodecrement */ | |
127 | fputc ('-', stream); | |
128 | case 6: /* Register deferred */ | |
129 | fprintf (stream, "(%s)", reg_names[regnum]); | |
130 | break; | |
131 | ||
132 | case 9: /* Autoincrement deferred */ | |
133 | fputc ('@', stream); | |
134 | if (regnum == PC_REGNUM) | |
135 | { | |
136 | fputc ('#', stream); | |
137 | print_address (*(long *)p, stream); | |
138 | p += 4; | |
139 | break; | |
140 | } | |
141 | case 8: /* Autoincrement */ | |
142 | if (regnum == PC_REGNUM) | |
143 | { | |
144 | fputc ('#', stream); | |
145 | switch (d[1]) | |
146 | { | |
147 | case 'b': | |
148 | fprintf (stream, "%d", *p++); | |
149 | break; | |
150 | ||
151 | case 'w': | |
152 | fprintf (stream, "%d", *(short *)p); | |
153 | p += 2; | |
154 | break; | |
155 | ||
156 | case 'l': | |
157 | fprintf (stream, "%d", *(long *)p); | |
158 | p += 4; | |
159 | break; | |
160 | ||
161 | case 'q': | |
162 | fprintf (stream, "0x%x%08x", ((long *)p)[1], ((long *)p)[0]); | |
163 | p += 8; | |
164 | break; | |
165 | ||
166 | case 'o': | |
167 | fprintf (stream, "0x%x%08x%08x%08x", | |
168 | ((long *)p)[3], ((long *)p)[2], | |
169 | ((long *)p)[1], ((long *)p)[0]); | |
170 | p += 16; | |
171 | break; | |
172 | ||
173 | case 'f': | |
174 | if (INVALID_FLOAT (p, 4)) | |
175 | fprintf (stream, "<<invalid float 0x%x>>", *(int *) p); | |
176 | else | |
177 | fprintf (stream, "%f", *(float *) p); | |
178 | p += 4; | |
179 | break; | |
180 | ||
181 | case 'd': | |
182 | if (INVALID_FLOAT (p, 8)) | |
183 | fprintf (stream, "<<invalid float 0x%x%08x>>", | |
184 | ((long *)p)[1], ((long *)p)[0]); | |
185 | else | |
186 | fprintf (stream, "%f", *(double *) p); | |
187 | p += 8; | |
188 | break; | |
189 | ||
190 | case 'g': | |
191 | fprintf (stream, "g-float"); | |
192 | p += 8; | |
193 | break; | |
194 | ||
195 | case 'h': | |
196 | fprintf (stream, "h-float"); | |
197 | p += 16; | |
198 | break; | |
199 | ||
200 | } | |
201 | } | |
202 | else | |
203 | fprintf (stream, "(%s)+", reg_names[regnum]); | |
204 | break; | |
205 | ||
206 | case 11: /* Byte displacement deferred */ | |
207 | fputc ('@', stream); | |
208 | case 10: /* Byte displacement */ | |
209 | if (regnum == PC_REGNUM) | |
210 | print_address (addr + *p + 2, stream); | |
211 | else | |
212 | fprintf (stream, "%d(%s)", *p, reg_names[regnum]); | |
213 | p += 1; | |
214 | break; | |
215 | ||
216 | case 13: /* Word displacement deferred */ | |
217 | fputc ('@', stream); | |
218 | case 12: /* Word displacement */ | |
219 | if (regnum == PC_REGNUM) | |
220 | print_address (addr + *(short *)p + 3, stream); | |
221 | else | |
222 | fprintf (stream, "%d(%s)", *(short *)p, reg_names[regnum]); | |
223 | p += 2; | |
224 | break; | |
225 | ||
226 | case 15: /* Long displacement deferred */ | |
227 | fputc ('@', stream); | |
228 | case 14: /* Long displacement */ | |
229 | if (regnum == PC_REGNUM) | |
230 | print_address (addr + *(long *)p + 5, stream); | |
231 | else | |
232 | fprintf (stream, "%d(%s)", *(long *)p, reg_names[regnum]); | |
233 | p += 4; | |
234 | } | |
235 | ||
236 | return (unsigned char *) p; | |
237 | } |