1 /* Disassemble AVR instructions.
2 Copyright (C) 1999-2016 Free Software Foundation, Inc.
3
4 Contributed by Denis Chertykov <denisc@overta.ru>
5
6 This file is part of libopcodes.
7
8 This library 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 3, or (at your option)
11 any later version.
12
13 It is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
17
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., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include <assert.h>
25 #include "dis-asm.h"
26 #include "opintl.h"
27 #include "libiberty.h"
28
29 struct avr_opcodes_s
30 {
31 char *name;
32 char *constraints;
33 char *opcode;
34 int insn_size; /* In words. */
35 int isa;
36 unsigned int bin_opcode;
37 };
38
39 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
40 {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},
41
42 const struct avr_opcodes_s avr_opcodes[] =
43 {
44 #include "opcode/avr.h"
45 {NULL, NULL, NULL, 0, 0, 0}
46 };
47
48 static const char * comment_start = "0x";
49
50 static int
avr_operand(unsigned int insn,unsigned int insn2,unsigned int pc,int constraint,char * opcode_str,char * buf,char * comment,int regs,int * sym,bfd_vma * sym_addr)51 avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,
52 char *opcode_str, char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
53 {
54 int ok = 1;
55 *sym = 0;
56
57 switch (constraint)
58 {
59 /* Any register operand. */
60 case 'r':
61 if (regs)
62 insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register. */
63 else
64 insn = (insn & 0x01f0) >> 4; /* Destination register. */
65
66 sprintf (buf, "r%d", insn);
67 break;
68
69 case 'd':
70 if (regs)
71 sprintf (buf, "r%d", 16 + (insn & 0xf));
72 else
73 sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));
74 break;
75
76 case 'w':
77 sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
78 break;
79
80 case 'a':
81 if (regs)
82 sprintf (buf, "r%d", 16 + (insn & 7));
83 else
84 sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));
85 break;
86
87 case 'v':
88 if (regs)
89 sprintf (buf, "r%d", (insn & 0xf) * 2);
90 else
91 sprintf (buf, "r%d", ((insn & 0xf0) >> 3));
92 break;
93
94 case 'e':
95 {
96 char *xyz;
97
98 switch (insn & 0x100f)
99 {
100 case 0x0000: xyz = "Z"; break;
101 case 0x1001: xyz = "Z+"; break;
102 case 0x1002: xyz = "-Z"; break;
103 case 0x0008: xyz = "Y"; break;
104 case 0x1009: xyz = "Y+"; break;
105 case 0x100a: xyz = "-Y"; break;
106 case 0x100c: xyz = "X"; break;
107 case 0x100d: xyz = "X+"; break;
108 case 0x100e: xyz = "-X"; break;
109 default: xyz = "??"; ok = 0;
110 }
111 strcpy (buf, xyz);
112
113 if (AVR_UNDEF_P (insn))
114 sprintf (comment, _("undefined"));
115 }
116 break;
117
118 case 'z':
119 *buf++ = 'Z';
120
121 /* Check for post-increment. */
122 char *s;
123 for (s = opcode_str; *s; ++s)
124 {
125 if (*s == '+')
126 {
127 if (insn & (1 << (15 - (s - opcode_str))))
128 *buf++ = '+';
129 break;
130 }
131 }
132
133 *buf = '\0';
134 if (AVR_UNDEF_P (insn))
135 sprintf (comment, _("undefined"));
136 break;
137
138 case 'b':
139 {
140 unsigned int x;
141
142 x = (insn & 7);
143 x |= (insn >> 7) & (3 << 3);
144 x |= (insn >> 8) & (1 << 5);
145
146 if (insn & 0x8)
147 *buf++ = 'Y';
148 else
149 *buf++ = 'Z';
150 sprintf (buf, "+%d", x);
151 sprintf (comment, "0x%02x", x);
152 }
153 break;
154
155 case 'h':
156 *sym = 1;
157 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
158 /* See PR binutils/2454. Ideally we would like to display the hex
159 value of the address only once, but this would mean recoding
160 objdump_print_address() which would affect many targets. */
161 sprintf (buf, "%#lx", (unsigned long) *sym_addr);
162 strcpy (comment, comment_start);
163 break;
164
165 case 'L':
166 {
167 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
168 sprintf (buf, ".%+-8d", rel_addr);
169 *sym = 1;
170 *sym_addr = pc + 2 + rel_addr;
171 strcpy (comment, comment_start);
172 }
173 break;
174
175 case 'l':
176 {
177 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
178
179 sprintf (buf, ".%+-8d", rel_addr);
180 *sym = 1;
181 *sym_addr = pc + 2 + rel_addr;
182 strcpy (comment, comment_start);
183 }
184 break;
185
186 case 'i':
187 {
188 unsigned int val = insn2 | 0x800000;
189 *sym = 1;
190 *sym_addr = val;
191 sprintf (buf, "0x%04X", insn2);
192 strcpy (comment, comment_start);
193 }
194 break;
195
196 case 'j':
197 {
198 unsigned int val = ((insn & 0xf) | ((insn & 0x600) >> 5)
199 | ((insn & 0x100) >> 2));
200 *sym = 1;
201 *sym_addr = val | 0x800000;
202 sprintf (buf, "0x%02x", val);
203 strcpy (comment, comment_start);
204 }
205 break;
206
207 case 'M':
208 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
209 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
210 break;
211
212 case 'n':
213 sprintf (buf, "??");
214 fprintf (stderr, _("Internal disassembler error"));
215 ok = 0;
216 break;
217
218 case 'K':
219 {
220 unsigned int x;
221
222 x = (insn & 0xf) | ((insn >> 2) & 0x30);
223 sprintf (buf, "0x%02x", x);
224 sprintf (comment, "%d", x);
225 }
226 break;
227
228 case 's':
229 sprintf (buf, "%d", insn & 7);
230 break;
231
232 case 'S':
233 sprintf (buf, "%d", (insn >> 4) & 7);
234 break;
235
236 case 'P':
237 {
238 unsigned int x;
239
240 x = (insn & 0xf);
241 x |= (insn >> 5) & 0x30;
242 sprintf (buf, "0x%02x", x);
243 sprintf (comment, "%d", x);
244 }
245 break;
246
247 case 'p':
248 {
249 unsigned int x;
250
251 x = (insn >> 3) & 0x1f;
252 sprintf (buf, "0x%02x", x);
253 sprintf (comment, "%d", x);
254 }
255 break;
256
257 case 'E':
258 sprintf (buf, "%d", (insn >> 4) & 15);
259 break;
260
261 case '?':
262 *buf = '\0';
263 break;
264
265 default:
266 sprintf (buf, "??");
267 fprintf (stderr, _("unknown constraint `%c'"), constraint);
268 ok = 0;
269 }
270
271 return ok;
272 }
273
274 static unsigned short
avrdis_opcode(bfd_vma addr,disassemble_info * info)275 avrdis_opcode (bfd_vma addr, disassemble_info *info)
276 {
277 bfd_byte buffer[2];
278 int status;
279
280 status = info->read_memory_func (addr, buffer, 2, info);
281
282 if (status == 0)
283 return bfd_getl16 (buffer);
284
285 info->memory_error_func (status, addr, info);
286 return -1;
287 }
288
289
290 int
print_insn_avr(bfd_vma addr,disassemble_info * info)291 print_insn_avr (bfd_vma addr, disassemble_info *info)
292 {
293 unsigned int insn, insn2;
294 const struct avr_opcodes_s *opcode;
295 static unsigned int *maskptr;
296 void *stream = info->stream;
297 fprintf_ftype prin = info->fprintf_func;
298 static unsigned int *avr_bin_masks;
299 static int initialized;
300 int cmd_len = 2;
301 int ok = 0;
302 char op1[20], op2[20], comment1[40], comment2[40];
303 int sym_op1 = 0, sym_op2 = 0;
304 bfd_vma sym_addr1, sym_addr2;
305
306
307 if (!initialized)
308 {
309 unsigned int nopcodes;
310
311 /* PR 4045: Try to avoid duplicating the 0x prefix that
312 objdump_print_addr() will put on addresses when there
313 is no symbol table available. */
314 if (info->symtab_size == 0)
315 comment_start = " ";
316
317 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
318
319 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
320
321 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
322 opcode->name;
323 opcode++, maskptr++)
324 {
325 char * s;
326 unsigned int bin = 0;
327 unsigned int mask = 0;
328
329 for (s = opcode->opcode; *s; ++s)
330 {
331 bin <<= 1;
332 mask <<= 1;
333 bin |= (*s == '1');
334 mask |= (*s == '1' || *s == '0');
335 }
336 assert (s - opcode->opcode == 16);
337 assert (opcode->bin_opcode == bin);
338 *maskptr = mask;
339 }
340
341 initialized = 1;
342 }
343
344 insn = avrdis_opcode (addr, info);
345
346 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
347 opcode->name;
348 opcode++, maskptr++)
349 {
350 if ((opcode->isa == AVR_ISA_TINY) && (info->mach != bfd_mach_avrtiny))
351 continue;
352 if ((insn & *maskptr) == opcode->bin_opcode)
353 break;
354 }
355
356 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
357 `std b+0,r' as `st b,r' (next entry in the table). */
358
359 if (AVR_DISP0_P (insn))
360 opcode++;
361
362 op1[0] = 0;
363 op2[0] = 0;
364 comment1[0] = 0;
365 comment2[0] = 0;
366
367 if (opcode->name)
368 {
369 char *constraints = opcode->constraints;
370 char *opcode_str = opcode->opcode;
371
372 insn2 = 0;
373 ok = 1;
374
375 if (opcode->insn_size > 1)
376 {
377 insn2 = avrdis_opcode (addr + 2, info);
378 cmd_len = 4;
379 }
380
381 if (*constraints && *constraints != '?')
382 {
383 int regs = REGISTER_P (*constraints);
384
385 ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1);
386
387 if (ok && *(++constraints) == ',')
388 ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2,
389 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
390 }
391 }
392
393 if (!ok)
394 {
395 /* Unknown opcode, or invalid combination of operands. */
396 sprintf (op1, "0x%04x", insn);
397 op2[0] = 0;
398 sprintf (comment1, "????");
399 comment2[0] = 0;
400 }
401
402 (*prin) (stream, "%s", ok ? opcode->name : ".word");
403
404 if (*op1)
405 (*prin) (stream, "\t%s", op1);
406
407 if (*op2)
408 (*prin) (stream, ", %s", op2);
409
410 if (*comment1)
411 (*prin) (stream, "\t; %s", comment1);
412
413 if (sym_op1)
414 info->print_address_func (sym_addr1, info);
415
416 if (*comment2)
417 (*prin) (stream, " %s", comment2);
418
419 if (sym_op2)
420 info->print_address_func (sym_addr2, info);
421
422 return cmd_len;
423 }
424