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c906108c SS |
1 | /* Print VAX instructions for GDB, the GNU debugger. |
2 | Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
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 | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "symtab.h" | |
22 | #include "opcode/vax.h" | |
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 | static unsigned char *print_insn_arg (); | |
31 | \f | |
b83266a0 SS |
32 | /* Advance PC across any function entry prologue instructions |
33 | to reach some "real" code. */ | |
34 | ||
35 | CORE_ADDR | |
36 | vax_skip_prologue (pc) | |
37 | CORE_ADDR pc; | |
38 | { | |
39 | register int op = (unsigned char) read_memory_integer (pc, 1); | |
40 | if (op == 0x11) | |
41 | pc += 2; /* skip brb */ | |
42 | if (op == 0x31) | |
43 | pc += 3; /* skip brw */ | |
44 | if (op == 0xC2 | |
45 | && ((unsigned char) read_memory_integer (pc+2, 1)) == 0x5E) | |
46 | pc += 3; /* skip subl2 */ | |
47 | if (op == 0x9E | |
48 | && ((unsigned char) read_memory_integer (pc+1, 1)) == 0xAE | |
49 | && ((unsigned char) read_memory_integer(pc+3, 1)) == 0x5E) | |
50 | pc += 4; /* skip movab */ | |
51 | if (op == 0x9E | |
52 | && ((unsigned char) read_memory_integer (pc+1, 1)) == 0xCE | |
53 | && ((unsigned char) read_memory_integer(pc+4, 1)) == 0x5E) | |
54 | pc += 5; /* skip movab */ | |
55 | if (op == 0x9E | |
56 | && ((unsigned char) read_memory_integer (pc+1, 1)) == 0xEE | |
57 | && ((unsigned char) read_memory_integer(pc+6, 1)) == 0x5E) | |
58 | pc += 7; /* skip movab */ | |
59 | return pc; | |
60 | } | |
61 | ||
392a587b JM |
62 | /* Return number of args passed to a frame. |
63 | Can return -1, meaning no way to tell. */ | |
64 | ||
65 | int | |
66 | vax_frame_num_args (fi) | |
67 | struct frame_info *fi; | |
68 | { | |
69 | return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); | |
70 | } | |
71 | ||
72 | ||
73 | ||
c906108c SS |
74 | /* Print the vax instruction at address MEMADDR in debugged memory, |
75 | from disassembler info INFO. | |
76 | Returns length of the instruction, in bytes. */ | |
77 | ||
78 | static int | |
79 | vax_print_insn (memaddr, info) | |
80 | CORE_ADDR memaddr; | |
81 | disassemble_info *info; | |
82 | { | |
83 | unsigned char buffer[MAXLEN]; | |
84 | register int i; | |
85 | register unsigned char *p; | |
86 | register char *d; | |
87 | ||
88 | int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info); | |
89 | if (status != 0) | |
90 | { | |
91 | (*info->memory_error_func) (status, memaddr, info); | |
92 | return -1; | |
93 | } | |
94 | ||
95 | for (i = 0; i < NOPCODES; i++) | |
96 | if (votstrs[i].detail.code == buffer[0] | |
97 | || votstrs[i].detail.code == *(unsigned short *)buffer) | |
98 | break; | |
99 | ||
100 | /* Handle undefined instructions. */ | |
101 | if (i == NOPCODES) | |
102 | { | |
103 | (*info->fprintf_func) (info->stream, "0%o", buffer[0]); | |
104 | return 1; | |
105 | } | |
106 | ||
107 | (*info->fprintf_func) (info->stream, "%s", votstrs[i].name); | |
108 | ||
109 | /* Point at first byte of argument data, | |
110 | and at descriptor for first argument. */ | |
111 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); | |
112 | d = votstrs[i].detail.args; | |
113 | ||
114 | if (*d) | |
115 | (*info->fprintf_func) (info->stream, " "); | |
116 | ||
117 | while (*d) | |
118 | { | |
119 | p = print_insn_arg (d, p, memaddr + (p - buffer), info); | |
120 | d += 2; | |
121 | if (*d) | |
122 | (*info->fprintf_func) (info->stream, ","); | |
123 | } | |
124 | return p - buffer; | |
125 | } | |
126 | ||
127 | static unsigned char * | |
128 | print_insn_arg (d, p, addr, info) | |
129 | char *d; | |
130 | register char *p; | |
131 | CORE_ADDR addr; | |
132 | disassemble_info *info; | |
133 | { | |
134 | register int regnum = *p & 0xf; | |
135 | float floatlitbuf; | |
136 | ||
137 | if (*d == 'b') | |
138 | { | |
139 | if (d[1] == 'b') | |
140 | (*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1); | |
141 | else | |
142 | { | |
143 | (*info->fprintf_func) (info->stream, "0x%x", addr + *(short *)p + 2); | |
144 | p += 2; | |
145 | } | |
146 | } | |
147 | else | |
148 | switch ((*p++ >> 4) & 0xf) | |
149 | { | |
150 | case 0: | |
151 | case 1: | |
152 | case 2: | |
153 | case 3: /* Literal mode */ | |
154 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') | |
155 | { | |
156 | *(int *)&floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); | |
157 | (*info->fprintf_func) (info->stream, "$%f", floatlitbuf); | |
158 | } | |
159 | else | |
160 | (*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f); | |
161 | break; | |
162 | ||
163 | case 4: /* Indexed */ | |
164 | p = (char *) print_insn_arg (d, p, addr + 1, info); | |
165 | (*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum)); | |
166 | break; | |
167 | ||
168 | case 5: /* Register */ | |
169 | (*info->fprintf_func) (info->stream, REGISTER_NAME (regnum)); | |
170 | break; | |
171 | ||
172 | case 7: /* Autodecrement */ | |
173 | (*info->fprintf_func) (info->stream, "-"); | |
174 | case 6: /* Register deferred */ | |
175 | (*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum)); | |
176 | break; | |
177 | ||
178 | case 9: /* Autoincrement deferred */ | |
179 | (*info->fprintf_func) (info->stream, "@"); | |
180 | if (regnum == PC_REGNUM) | |
181 | { | |
182 | (*info->fprintf_func) (info->stream, "#"); | |
183 | info->target = *(long *)p; | |
184 | (*info->print_address_func) (info->target, info); | |
185 | p += 4; | |
186 | break; | |
187 | } | |
188 | case 8: /* Autoincrement */ | |
189 | if (regnum == PC_REGNUM) | |
190 | { | |
191 | (*info->fprintf_func) (info->stream, "#"); | |
192 | switch (d[1]) | |
193 | { | |
194 | case 'b': | |
195 | (*info->fprintf_func) (info->stream, "%d", *p++); | |
196 | break; | |
197 | ||
198 | case 'w': | |
199 | (*info->fprintf_func) (info->stream, "%d", *(short *)p); | |
200 | p += 2; | |
201 | break; | |
202 | ||
203 | case 'l': | |
204 | (*info->fprintf_func) (info->stream, "%d", *(long *)p); | |
205 | p += 4; | |
206 | break; | |
207 | ||
208 | case 'q': | |
209 | (*info->fprintf_func) (info->stream, "0x%x%08x", | |
210 | ((long *)p)[1], ((long *)p)[0]); | |
211 | p += 8; | |
212 | break; | |
213 | ||
214 | case 'o': | |
215 | (*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x", | |
216 | ((long *)p)[3], ((long *)p)[2], | |
217 | ((long *)p)[1], ((long *)p)[0]); | |
218 | p += 16; | |
219 | break; | |
220 | ||
221 | case 'f': | |
222 | if (INVALID_FLOAT (p, 4)) | |
223 | (*info->fprintf_func) (info->stream, | |
224 | "<<invalid float 0x%x>>", | |
225 | *(int *) p); | |
226 | else | |
227 | (*info->fprintf_func) (info->stream, "%f", *(float *) p); | |
228 | p += 4; | |
229 | break; | |
230 | ||
231 | case 'd': | |
232 | if (INVALID_FLOAT (p, 8)) | |
233 | (*info->fprintf_func) (info->stream, | |
234 | "<<invalid float 0x%x%08x>>", | |
235 | ((long *)p)[1], ((long *)p)[0]); | |
236 | else | |
237 | (*info->fprintf_func) (info->stream, "%f", *(double *) p); | |
238 | p += 8; | |
239 | break; | |
240 | ||
241 | case 'g': | |
242 | (*info->fprintf_func) (info->stream, "g-float"); | |
243 | p += 8; | |
244 | break; | |
245 | ||
246 | case 'h': | |
247 | (*info->fprintf_func) (info->stream, "h-float"); | |
248 | p += 16; | |
249 | break; | |
250 | ||
251 | } | |
252 | } | |
253 | else | |
254 | (*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum)); | |
255 | break; | |
256 | ||
257 | case 11: /* Byte displacement deferred */ | |
258 | (*info->fprintf_func) (info->stream, "@"); | |
259 | case 10: /* Byte displacement */ | |
260 | if (regnum == PC_REGNUM) | |
261 | { | |
262 | info->target = addr + *p + 2; | |
263 | (*info->print_address_func) (info->target, info); | |
264 | } | |
265 | else | |
266 | (*info->fprintf_func) (info->stream, "%d(%s)", *p, REGISTER_NAME (regnum)); | |
267 | p += 1; | |
268 | break; | |
269 | ||
270 | case 13: /* Word displacement deferred */ | |
271 | (*info->fprintf_func) (info->stream, "@"); | |
272 | case 12: /* Word displacement */ | |
273 | if (regnum == PC_REGNUM) | |
274 | { | |
275 | info->target = addr + *(short *)p + 3; | |
276 | (*info->print_address_func) (info->target, info); | |
277 | } | |
278 | else | |
279 | (*info->fprintf_func) (info->stream, "%d(%s)", | |
280 | *(short *)p, REGISTER_NAME (regnum)); | |
281 | p += 2; | |
282 | break; | |
283 | ||
284 | case 15: /* Long displacement deferred */ | |
285 | (*info->fprintf_func) (info->stream, "@"); | |
286 | case 14: /* Long displacement */ | |
287 | if (regnum == PC_REGNUM) | |
288 | { | |
289 | info->target = addr + *(short *)p + 5; | |
290 | (*info->print_address_func) (info->target, info); | |
291 | } | |
292 | else | |
293 | (*info->fprintf_func) (info->stream, "%d(%s)", | |
294 | *(long *)p, REGISTER_NAME (regnum)); | |
295 | p += 4; | |
296 | } | |
297 | ||
298 | return (unsigned char *) p; | |
299 | } | |
300 | ||
301 | void | |
302 | _initialize_vax_tdep () | |
303 | { | |
304 | tm_print_insn = vax_print_insn; | |
305 | } |