Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Print VAX instructions for GDB, the GNU debugger. |
2 | Copyright 1986, 1989, 1991, 1992, 1996 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "symtab.h" | |
23 | #include "opcode/vax.h" | |
24 | ||
25 | /* Vax instructions are never longer than this. */ | |
26 | #define MAXLEN 62 | |
27 | ||
28 | /* Number of elements in the opcode table. */ | |
29 | #define NOPCODES (sizeof votstrs / sizeof votstrs[0]) | |
30 | ||
31 | static unsigned char *print_insn_arg (); | |
32 | \f | |
b83266a0 SS |
33 | /* Advance PC across any function entry prologue instructions |
34 | to reach some "real" code. */ | |
35 | ||
36 | CORE_ADDR | |
fba45db2 | 37 | vax_skip_prologue (CORE_ADDR pc) |
b83266a0 SS |
38 | { |
39 | register int op = (unsigned char) read_memory_integer (pc, 1); | |
40 | if (op == 0x11) | |
c5aa993b | 41 | pc += 2; /* skip brb */ |
b83266a0 | 42 | if (op == 0x31) |
c5aa993b | 43 | pc += 3; /* skip brw */ |
b83266a0 | 44 | if (op == 0xC2 |
c5aa993b JM |
45 | && ((unsigned char) read_memory_integer (pc + 2, 1)) == 0x5E) |
46 | pc += 3; /* skip subl2 */ | |
b83266a0 | 47 | if (op == 0x9E |
c5aa993b JM |
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 */ | |
b83266a0 | 51 | if (op == 0x9E |
c5aa993b JM |
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 */ | |
b83266a0 | 55 | if (op == 0x9E |
c5aa993b JM |
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 */ | |
b83266a0 SS |
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 | |
fba45db2 | 66 | vax_frame_num_args (struct frame_info *fi) |
392a587b JM |
67 | { |
68 | return (0xff & read_memory_integer (FRAME_ARGS_ADDRESS (fi), 1)); | |
69 | } | |
70 | ||
71 | ||
72 | ||
c906108c SS |
73 | /* Print the vax instruction at address MEMADDR in debugged memory, |
74 | from disassembler info INFO. | |
75 | Returns length of the instruction, in bytes. */ | |
76 | ||
77 | static int | |
fba45db2 | 78 | vax_print_insn (CORE_ADDR memaddr, disassemble_info *info) |
c906108c SS |
79 | { |
80 | unsigned char buffer[MAXLEN]; | |
81 | register int i; | |
82 | register unsigned char *p; | |
83 | register char *d; | |
84 | ||
85 | int status = (*info->read_memory_func) (memaddr, buffer, MAXLEN, info); | |
86 | if (status != 0) | |
87 | { | |
88 | (*info->memory_error_func) (status, memaddr, info); | |
89 | return -1; | |
90 | } | |
91 | ||
92 | for (i = 0; i < NOPCODES; i++) | |
93 | if (votstrs[i].detail.code == buffer[0] | |
c5aa993b | 94 | || votstrs[i].detail.code == *(unsigned short *) buffer) |
c906108c SS |
95 | break; |
96 | ||
97 | /* Handle undefined instructions. */ | |
98 | if (i == NOPCODES) | |
99 | { | |
100 | (*info->fprintf_func) (info->stream, "0%o", buffer[0]); | |
101 | return 1; | |
102 | } | |
103 | ||
104 | (*info->fprintf_func) (info->stream, "%s", votstrs[i].name); | |
105 | ||
106 | /* Point at first byte of argument data, | |
107 | and at descriptor for first argument. */ | |
108 | p = buffer + 1 + (votstrs[i].detail.code >= 0x100); | |
109 | d = votstrs[i].detail.args; | |
110 | ||
111 | if (*d) | |
112 | (*info->fprintf_func) (info->stream, " "); | |
113 | ||
114 | while (*d) | |
115 | { | |
116 | p = print_insn_arg (d, p, memaddr + (p - buffer), info); | |
117 | d += 2; | |
118 | if (*d) | |
119 | (*info->fprintf_func) (info->stream, ","); | |
120 | } | |
121 | return p - buffer; | |
122 | } | |
123 | ||
124 | static unsigned char * | |
fba45db2 KB |
125 | print_insn_arg (char *d, register char *p, CORE_ADDR addr, |
126 | disassemble_info *info) | |
c906108c SS |
127 | { |
128 | register int regnum = *p & 0xf; | |
129 | float floatlitbuf; | |
130 | ||
131 | if (*d == 'b') | |
132 | { | |
133 | if (d[1] == 'b') | |
134 | (*info->fprintf_func) (info->stream, "0x%x", addr + *p++ + 1); | |
135 | else | |
136 | { | |
c5aa993b | 137 | (*info->fprintf_func) (info->stream, "0x%x", addr + *(short *) p + 2); |
c906108c SS |
138 | p += 2; |
139 | } | |
140 | } | |
141 | else | |
142 | switch ((*p++ >> 4) & 0xf) | |
143 | { | |
144 | case 0: | |
145 | case 1: | |
146 | case 2: | |
147 | case 3: /* Literal mode */ | |
148 | if (d[1] == 'd' || d[1] == 'f' || d[1] == 'g' || d[1] == 'h') | |
149 | { | |
c5aa993b | 150 | *(int *) &floatlitbuf = 0x4000 + ((p[-1] & 0x3f) << 4); |
c906108c SS |
151 | (*info->fprintf_func) (info->stream, "$%f", floatlitbuf); |
152 | } | |
153 | else | |
154 | (*info->fprintf_func) (info->stream, "$%d", p[-1] & 0x3f); | |
155 | break; | |
156 | ||
157 | case 4: /* Indexed */ | |
158 | p = (char *) print_insn_arg (d, p, addr + 1, info); | |
159 | (*info->fprintf_func) (info->stream, "[%s]", REGISTER_NAME (regnum)); | |
160 | break; | |
161 | ||
162 | case 5: /* Register */ | |
163 | (*info->fprintf_func) (info->stream, REGISTER_NAME (regnum)); | |
164 | break; | |
165 | ||
166 | case 7: /* Autodecrement */ | |
167 | (*info->fprintf_func) (info->stream, "-"); | |
168 | case 6: /* Register deferred */ | |
169 | (*info->fprintf_func) (info->stream, "(%s)", REGISTER_NAME (regnum)); | |
170 | break; | |
171 | ||
172 | case 9: /* Autoincrement deferred */ | |
173 | (*info->fprintf_func) (info->stream, "@"); | |
174 | if (regnum == PC_REGNUM) | |
175 | { | |
176 | (*info->fprintf_func) (info->stream, "#"); | |
c5aa993b | 177 | info->target = *(long *) p; |
c906108c SS |
178 | (*info->print_address_func) (info->target, info); |
179 | p += 4; | |
180 | break; | |
181 | } | |
182 | case 8: /* Autoincrement */ | |
183 | if (regnum == PC_REGNUM) | |
184 | { | |
185 | (*info->fprintf_func) (info->stream, "#"); | |
186 | switch (d[1]) | |
187 | { | |
188 | case 'b': | |
189 | (*info->fprintf_func) (info->stream, "%d", *p++); | |
190 | break; | |
191 | ||
192 | case 'w': | |
c5aa993b | 193 | (*info->fprintf_func) (info->stream, "%d", *(short *) p); |
c906108c SS |
194 | p += 2; |
195 | break; | |
196 | ||
197 | case 'l': | |
c5aa993b | 198 | (*info->fprintf_func) (info->stream, "%d", *(long *) p); |
c906108c SS |
199 | p += 4; |
200 | break; | |
201 | ||
202 | case 'q': | |
203 | (*info->fprintf_func) (info->stream, "0x%x%08x", | |
c5aa993b | 204 | ((long *) p)[1], ((long *) p)[0]); |
c906108c SS |
205 | p += 8; |
206 | break; | |
207 | ||
208 | case 'o': | |
209 | (*info->fprintf_func) (info->stream, "0x%x%08x%08x%08x", | |
c5aa993b JM |
210 | ((long *) p)[3], ((long *) p)[2], |
211 | ((long *) p)[1], ((long *) p)[0]); | |
c906108c SS |
212 | p += 16; |
213 | break; | |
214 | ||
215 | case 'f': | |
216 | if (INVALID_FLOAT (p, 4)) | |
217 | (*info->fprintf_func) (info->stream, | |
218 | "<<invalid float 0x%x>>", | |
219 | *(int *) p); | |
220 | else | |
221 | (*info->fprintf_func) (info->stream, "%f", *(float *) p); | |
222 | p += 4; | |
223 | break; | |
224 | ||
225 | case 'd': | |
226 | if (INVALID_FLOAT (p, 8)) | |
227 | (*info->fprintf_func) (info->stream, | |
228 | "<<invalid float 0x%x%08x>>", | |
c5aa993b | 229 | ((long *) p)[1], ((long *) p)[0]); |
c906108c SS |
230 | else |
231 | (*info->fprintf_func) (info->stream, "%f", *(double *) p); | |
232 | p += 8; | |
233 | break; | |
234 | ||
235 | case 'g': | |
236 | (*info->fprintf_func) (info->stream, "g-float"); | |
237 | p += 8; | |
238 | break; | |
239 | ||
240 | case 'h': | |
241 | (*info->fprintf_func) (info->stream, "h-float"); | |
242 | p += 16; | |
243 | break; | |
244 | ||
245 | } | |
246 | } | |
247 | else | |
248 | (*info->fprintf_func) (info->stream, "(%s)+", REGISTER_NAME (regnum)); | |
249 | break; | |
250 | ||
251 | case 11: /* Byte displacement deferred */ | |
252 | (*info->fprintf_func) (info->stream, "@"); | |
253 | case 10: /* Byte displacement */ | |
254 | if (regnum == PC_REGNUM) | |
255 | { | |
256 | info->target = addr + *p + 2; | |
257 | (*info->print_address_func) (info->target, info); | |
258 | } | |
259 | else | |
260 | (*info->fprintf_func) (info->stream, "%d(%s)", *p, REGISTER_NAME (regnum)); | |
261 | p += 1; | |
262 | break; | |
263 | ||
264 | case 13: /* Word displacement deferred */ | |
265 | (*info->fprintf_func) (info->stream, "@"); | |
266 | case 12: /* Word displacement */ | |
267 | if (regnum == PC_REGNUM) | |
268 | { | |
c5aa993b | 269 | info->target = addr + *(short *) p + 3; |
c906108c SS |
270 | (*info->print_address_func) (info->target, info); |
271 | } | |
272 | else | |
273 | (*info->fprintf_func) (info->stream, "%d(%s)", | |
c5aa993b | 274 | *(short *) p, REGISTER_NAME (regnum)); |
c906108c SS |
275 | p += 2; |
276 | break; | |
277 | ||
278 | case 15: /* Long displacement deferred */ | |
279 | (*info->fprintf_func) (info->stream, "@"); | |
280 | case 14: /* Long displacement */ | |
281 | if (regnum == PC_REGNUM) | |
282 | { | |
c5aa993b | 283 | info->target = addr + *(short *) p + 5; |
c906108c SS |
284 | (*info->print_address_func) (info->target, info); |
285 | } | |
286 | else | |
287 | (*info->fprintf_func) (info->stream, "%d(%s)", | |
c5aa993b | 288 | *(long *) p, REGISTER_NAME (regnum)); |
c906108c SS |
289 | p += 4; |
290 | } | |
291 | ||
292 | return (unsigned char *) p; | |
293 | } | |
294 | ||
295 | void | |
fba45db2 | 296 | _initialize_vax_tdep (void) |
c906108c SS |
297 | { |
298 | tm_print_insn = vax_print_insn; | |
299 | } |