1 /* Disassemble Motorola M*Core instructions.
2 Copyright (C) 1993-2021 Free Software Foundation, Inc.
3
4 This file is part of the GNU opcodes library.
5
6 This library 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 3, or (at your option)
9 any later version.
10
11 It is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
14 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., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include <stdio.h>
23 #include "libiberty.h"
24 #define STATIC_TABLE
25 #define DEFINE_TABLE
26
27 #include "mcore-opc.h"
28 #include "disassemble.h"
29
30 /* Mask for each mcore_opclass: */
31 static const unsigned short imsk[] = {
32 /* O0 */ 0xFFFF,
33 /* OT */ 0xFFFC,
34 /* O1 */ 0xFFF0,
35 /* OC */ 0xFE00,
36 /* O2 */ 0xFF00,
37 /* X1 */ 0xFFF0,
38 /* OI */ 0xFE00,
39 /* OB */ 0xFE00,
40
41 /* OMa */ 0xFFF0,
42 /* SI */ 0xFE00,
43 /* I7 */ 0xF800,
44 /* LS */ 0xF000,
45 /* BR */ 0xF800,
46 /* BL */ 0xFF00,
47 /* LR */ 0xF000,
48 /* LJ */ 0xFF00,
49
50 /* RM */ 0xFFF0,
51 /* RQ */ 0xFFF0,
52 /* JSR */ 0xFFF0,
53 /* JMP */ 0xFFF0,
54 /* OBRa*/ 0xFFF0,
55 /* OBRb*/ 0xFF80,
56 /* OBRc*/ 0xFF00,
57 /* OBR2*/ 0xFE00,
58
59 /* O1R1*/ 0xFFF0,
60 /* OMb */ 0xFF80,
61 /* OMc */ 0xFF00,
62 /* SIa */ 0xFE00,
63
64 /* MULSH */ 0xFF00,
65 /* OPSR */ 0xFFF8, /* psrset/psrclr */
66
67 /* JC */ 0, /* JC,JU,JL don't appear in object */
68 /* JU */ 0,
69 /* JL */ 0,
70 /* RSI */ 0,
71 /* DO21*/ 0,
72 /* OB2 */ 0 /* OB2 won't appear in object. */
73 };
74
75 static const char *grname[] = {
76 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
77 "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
78 };
79
80 static const char X[] = "??";
81
82 static const char *crname[] = {
83 "psr", "vbr", "epsr", "fpsr", "epc", "fpc", "ss0", "ss1",
84 "ss2", "ss3", "ss4", "gcr", "gsr", X, X, X,
85 X, X, X, X, X, X, X, X,
86 X, X, X, X, X, X, X, X
87 };
88
89 static const unsigned isiz[] = { 2, 0, 1, 0 };
90
91 int
print_insn_mcore(bfd_vma memaddr,struct disassemble_info * info)92 print_insn_mcore (bfd_vma memaddr,
93 struct disassemble_info *info)
94 {
95 unsigned char ibytes[4];
96 fprintf_ftype print_func = info->fprintf_func;
97 void *stream = info->stream;
98 unsigned int inst;
99 unsigned int i;
100 int status;
101
102 info->bytes_per_chunk = 2;
103
104 status = info->read_memory_func (memaddr, ibytes, 2, info);
105
106 if (status != 0)
107 {
108 info->memory_error_func (status, memaddr, info);
109 return -1;
110 }
111
112 if (info->endian == BFD_ENDIAN_BIG)
113 inst = (ibytes[0] << 8) | ibytes[1];
114 else if (info->endian == BFD_ENDIAN_LITTLE)
115 inst = (ibytes[1] << 8) | ibytes[0];
116 else
117 abort ();
118
119 /* Just a linear search of the table. */
120 for (i = 0; i < ARRAY_SIZE (mcore_table); i++)
121 if (mcore_table[i].inst == (inst & imsk[mcore_table[i].opclass]))
122 break;
123
124 if (i == ARRAY_SIZE (mcore_table))
125 (*print_func) (stream, ".short 0x%04x", inst);
126 else
127 {
128 const char *name = grname[inst & 0x0F];
129
130 (*print_func) (stream, "%s", mcore_table[i].name);
131
132 switch (mcore_table[i].opclass)
133 {
134 case O0:
135 break;
136
137 case OT:
138 (*print_func) (stream, "\t%d", inst & 0x3);
139 break;
140
141 case O1:
142 case JMP:
143 case JSR:
144 (*print_func) (stream, "\t%s", name);
145 break;
146
147 case OC:
148 (*print_func) (stream, "\t%s, %s", name, crname[(inst >> 4) & 0x1F]);
149 break;
150
151 case O1R1:
152 (*print_func) (stream, "\t%s, r1", name);
153 break;
154
155 case MULSH:
156 case O2:
157 (*print_func) (stream, "\t%s, %s", name, grname[(inst >> 4) & 0xF]);
158 break;
159
160 case X1:
161 (*print_func) (stream, "\tr1, %s", name);
162 break;
163
164 case OI:
165 (*print_func) (stream, "\t%s, %d", name, ((inst >> 4) & 0x1F) + 1);
166 break;
167
168 case RM:
169 (*print_func) (stream, "\t%s-r15, (r0)", name);
170 break;
171
172 case RQ:
173 (*print_func) (stream, "\tr4-r7, (%s)", name);
174 break;
175
176 case OB:
177 case OBRa:
178 case OBRb:
179 case OBRc:
180 case SI:
181 case SIa:
182 case OMa:
183 case OMb:
184 case OMc:
185 (*print_func) (stream, "\t%s, %d", name, (inst >> 4) & 0x1F);
186 break;
187
188 case I7:
189 (*print_func) (stream, "\t%s, %d", name, (inst >> 4) & 0x7F);
190 break;
191
192 case LS:
193 (*print_func) (stream, "\t%s, (%s, %d)", grname[(inst >> 8) & 0xF],
194 name, ((inst >> 4) & 0xF) << isiz[(inst >> 13) & 3]);
195 break;
196
197 case BR:
198 {
199 uint32_t val = ((inst & 0x3FF) ^ 0x400) - 0x400;
200
201 val = memaddr + 2 + (val << 1);
202 (*print_func) (stream, "\t0x%x", val);
203
204 if (strcmp (mcore_table[i].name, "bsr") == 0)
205 {
206 /* For bsr, we'll try to get a symbol for the target. */
207 if (info->print_address_func && val != 0)
208 {
209 (*print_func) (stream, "\t// ");
210 info->print_address_func (val, info);
211 }
212 }
213 }
214 break;
215
216 case BL:
217 {
218 uint32_t val = memaddr + 2 + ((inst | ~0xF) << 1);
219
220 (*print_func) (stream, "\t%s, 0x%x",
221 grname[(inst >> 4) & 0xF], val);
222 }
223 break;
224
225 case LR:
226 {
227 uint32_t val;
228
229 val = (memaddr + 2 + ((inst & 0xFF) << 2)) & ~3;
230
231 /* We are not reading an instruction, so allow
232 reads to extend beyond the next symbol. */
233 info->stop_vma = 0;
234 status = info->read_memory_func (val, ibytes, 4, info);
235 if (status != 0)
236 {
237 info->memory_error_func (status, memaddr, info);
238 break;
239 }
240
241 if (info->endian == BFD_ENDIAN_LITTLE)
242 val = (((unsigned) ibytes[3] << 24) | (ibytes[2] << 16)
243 | (ibytes[1] << 8) | (ibytes[0]));
244 else
245 val = (((unsigned) ibytes[0] << 24) | (ibytes[1] << 16)
246 | (ibytes[2] << 8) | (ibytes[3]));
247
248 /* Removed [] around literal value to match ABI syntax 12/95. */
249 (*print_func) (stream, "\t%s, 0x%X", grname[(inst >> 8) & 0xF], val);
250
251 if (val == 0)
252 (*print_func) (stream, "\t// from address pool at 0x%x",
253 (uint32_t) (memaddr + 2
254 + ((inst & 0xFF) << 2)) & ~3);
255 }
256 break;
257
258 case LJ:
259 {
260 uint32_t val;
261
262 val = (memaddr + 2 + ((inst & 0xFF) << 2)) & ~3;
263
264 /* We are not reading an instruction, so allow
265 reads to extend beyond the next symbol. */
266 info->stop_vma = 0;
267 status = info->read_memory_func (val, ibytes, 4, info);
268 if (status != 0)
269 {
270 info->memory_error_func (status, memaddr, info);
271 break;
272 }
273
274 if (info->endian == BFD_ENDIAN_LITTLE)
275 val = (((unsigned) ibytes[3] << 24) | (ibytes[2] << 16)
276 | (ibytes[1] << 8) | (ibytes[0]));
277 else
278 val = (((unsigned) ibytes[0] << 24) | (ibytes[1] << 16)
279 | (ibytes[2] << 8) | (ibytes[3]));
280
281 /* Removed [] around literal value to match ABI syntax 12/95. */
282 (*print_func) (stream, "\t0x%X", val);
283 /* For jmpi/jsri, we'll try to get a symbol for the target. */
284 if (info->print_address_func && val != 0)
285 {
286 (*print_func) (stream, "\t// ");
287 info->print_address_func (val, info);
288 }
289 else
290 {
291 (*print_func) (stream, "\t// from address pool at 0x%x",
292 (uint32_t) (memaddr + 2
293 + ((inst & 0xFF) << 2)) & ~3);
294 }
295 }
296 break;
297
298 case OPSR:
299 {
300 static char *fields[] = {
301 "af", "ie", "fe", "fe,ie",
302 "ee", "ee,ie", "ee,fe", "ee,fe,ie"
303 };
304
305 (*print_func) (stream, "\t%s", fields[inst & 0x7]);
306 }
307 break;
308
309 default:
310 /* If the disassembler lags the instruction set. */
311 (*print_func) (stream, "\tundecoded operands, inst is 0x%04x", inst);
312 break;
313 }
314 }
315
316 /* Say how many bytes we consumed. */
317 return 2;
318 }
319