1 /* Disassemble AVR instructions.
2 Copyright (C) 1999-2021 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 "disassemble.h"
26 #include "opintl.h"
27 #include "libiberty.h"
28 #include <stdint.h>
29
30 struct avr_opcodes_s
31 {
32 char *name;
33 char *constraints;
34 char *opcode;
35 int insn_size; /* In words. */
36 int isa;
37 unsigned int bin_opcode;
38 };
39
40 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
41 {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},
42
43 const struct avr_opcodes_s avr_opcodes[] =
44 {
45 #include "opcode/avr.h"
46 {NULL, NULL, NULL, 0, 0, 0}
47 };
48
49 static const char * comment_start = "0x";
50
51 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)52 avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,
53 char *opcode_str, char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
54 {
55 int ok = 1;
56 *sym = 0;
57
58 switch (constraint)
59 {
60 /* Any register operand. */
61 case 'r':
62 if (regs)
63 insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register. */
64 else
65 insn = (insn & 0x01f0) >> 4; /* Destination register. */
66
67 sprintf (buf, "r%d", insn);
68 break;
69
70 case 'd':
71 if (regs)
72 sprintf (buf, "r%d", 16 + (insn & 0xf));
73 else
74 sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));
75 break;
76
77 case 'w':
78 sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
79 break;
80
81 case 'a':
82 if (regs)
83 sprintf (buf, "r%d", 16 + (insn & 7));
84 else
85 sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));
86 break;
87
88 case 'v':
89 if (regs)
90 sprintf (buf, "r%d", (insn & 0xf) * 2);
91 else
92 sprintf (buf, "r%d", ((insn & 0xf0) >> 3));
93 break;
94
95 case 'e':
96 {
97 char *xyz;
98
99 switch (insn & 0x100f)
100 {
101 case 0x0000: xyz = "Z"; break;
102 case 0x1001: xyz = "Z+"; break;
103 case 0x1002: xyz = "-Z"; break;
104 case 0x0008: xyz = "Y"; break;
105 case 0x1009: xyz = "Y+"; break;
106 case 0x100a: xyz = "-Y"; break;
107 case 0x100c: xyz = "X"; break;
108 case 0x100d: xyz = "X+"; break;
109 case 0x100e: xyz = "-X"; break;
110 default: xyz = "??"; ok = 0;
111 }
112 strcpy (buf, xyz);
113
114 if (AVR_UNDEF_P (insn))
115 sprintf (comment, _("undefined"));
116 }
117 break;
118
119 case 'z':
120 *buf++ = 'Z';
121
122 /* Check for post-increment. */
123 char *s;
124 for (s = opcode_str; *s; ++s)
125 {
126 if (*s == '+')
127 {
128 if (insn & (1 << (15 - (s - opcode_str))))
129 *buf++ = '+';
130 break;
131 }
132 }
133
134 *buf = '\0';
135 if (AVR_UNDEF_P (insn))
136 sprintf (comment, _("undefined"));
137 break;
138
139 case 'b':
140 {
141 unsigned int x;
142
143 x = (insn & 7);
144 x |= (insn >> 7) & (3 << 3);
145 x |= (insn >> 8) & (1 << 5);
146
147 if (insn & 0x8)
148 *buf++ = 'Y';
149 else
150 *buf++ = 'Z';
151 sprintf (buf, "+%d", x);
152 sprintf (comment, "0x%02x", x);
153 }
154 break;
155
156 case 'h':
157 *sym = 1;
158 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
159 /* See PR binutils/2454. Ideally we would like to display the hex
160 value of the address only once, but this would mean recoding
161 objdump_print_address() which would affect many targets. */
162 sprintf (buf, "%#lx", (unsigned long) *sym_addr);
163 strcpy (comment, comment_start);
164 break;
165
166 case 'L':
167 {
168 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
169 sprintf (buf, ".%+-8d", rel_addr);
170 *sym = 1;
171 *sym_addr = pc + 2 + rel_addr;
172 strcpy (comment, comment_start);
173 }
174 break;
175
176 case 'l':
177 {
178 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
179
180 sprintf (buf, ".%+-8d", rel_addr);
181 *sym = 1;
182 *sym_addr = pc + 2 + rel_addr;
183 strcpy (comment, comment_start);
184 }
185 break;
186
187 case 'i':
188 {
189 unsigned int val = insn2 | 0x800000;
190 *sym = 1;
191 *sym_addr = val;
192 sprintf (buf, "0x%04X", insn2);
193 strcpy (comment, comment_start);
194 }
195 break;
196
197 case 'j':
198 {
199 unsigned int val = ((insn & 0xf) | ((insn & 0x600) >> 5)
200 | ((insn & 0x100) >> 2));
201 if ((insn & 0x100) == 0)
202 val |= 0x80;
203 *sym = 1;
204 *sym_addr = val | 0x800000;
205 sprintf (buf, "0x%02x", val);
206 strcpy (comment, comment_start);
207 }
208 break;
209
210 case 'M':
211 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
212 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
213 break;
214
215 case 'n':
216 sprintf (buf, "??");
217 /* xgettext:c-format */
218 opcodes_error_handler (_("internal disassembler error"));
219 ok = 0;
220 break;
221
222 case 'K':
223 {
224 unsigned int x;
225
226 x = (insn & 0xf) | ((insn >> 2) & 0x30);
227 sprintf (buf, "0x%02x", x);
228 sprintf (comment, "%d", x);
229 }
230 break;
231
232 case 's':
233 sprintf (buf, "%d", insn & 7);
234 break;
235
236 case 'S':
237 sprintf (buf, "%d", (insn >> 4) & 7);
238 break;
239
240 case 'P':
241 {
242 unsigned int x;
243
244 x = (insn & 0xf);
245 x |= (insn >> 5) & 0x30;
246 sprintf (buf, "0x%02x", x);
247 sprintf (comment, "%d", x);
248 }
249 break;
250
251 case 'p':
252 {
253 unsigned int x;
254
255 x = (insn >> 3) & 0x1f;
256 sprintf (buf, "0x%02x", x);
257 sprintf (comment, "%d", x);
258 }
259 break;
260
261 case 'E':
262 sprintf (buf, "%d", (insn >> 4) & 15);
263 break;
264
265 case '?':
266 *buf = '\0';
267 break;
268
269 default:
270 sprintf (buf, "??");
271 /* xgettext:c-format */
272 opcodes_error_handler (_("unknown constraint `%c'"), constraint);
273 ok = 0;
274 }
275
276 return ok;
277 }
278
279 /* Read the opcode from ADDR. Return 0 in success and save opcode
280 in *INSN, otherwise, return -1. */
281
282 static int
avrdis_opcode(bfd_vma addr,disassemble_info * info,uint16_t * insn)283 avrdis_opcode (bfd_vma addr, disassemble_info *info, uint16_t *insn)
284 {
285 bfd_byte buffer[2];
286 int status;
287
288 status = info->read_memory_func (addr, buffer, 2, info);
289
290 if (status == 0)
291 {
292 *insn = bfd_getl16 (buffer);
293 return 0;
294 }
295
296 info->memory_error_func (status, addr, info);
297 return -1;
298 }
299
300
301 int
print_insn_avr(bfd_vma addr,disassemble_info * info)302 print_insn_avr (bfd_vma addr, disassemble_info *info)
303 {
304 uint16_t insn, insn2;
305 const struct avr_opcodes_s *opcode;
306 static unsigned int *maskptr;
307 void *stream = info->stream;
308 fprintf_ftype prin = info->fprintf_func;
309 static unsigned int *avr_bin_masks;
310 static int initialized;
311 int cmd_len = 2;
312 int ok = 0;
313 char op1[20], op2[20], comment1[40], comment2[40];
314 int sym_op1 = 0, sym_op2 = 0;
315 bfd_vma sym_addr1, sym_addr2;
316
317
318 if (!initialized)
319 {
320 unsigned int nopcodes;
321
322 /* PR 4045: Try to avoid duplicating the 0x prefix that
323 objdump_print_addr() will put on addresses when there
324 is no symbol table available. */
325 if (info->symtab_size == 0)
326 comment_start = " ";
327
328 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
329
330 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
331
332 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
333 opcode->name;
334 opcode++, maskptr++)
335 {
336 char * s;
337 unsigned int bin = 0;
338 unsigned int mask = 0;
339
340 for (s = opcode->opcode; *s; ++s)
341 {
342 bin <<= 1;
343 mask <<= 1;
344 bin |= (*s == '1');
345 mask |= (*s == '1' || *s == '0');
346 }
347 assert (s - opcode->opcode == 16);
348 assert (opcode->bin_opcode == bin);
349 *maskptr = mask;
350 }
351
352 initialized = 1;
353 }
354
355 if (avrdis_opcode (addr, info, &insn) != 0)
356 return -1;
357
358 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
359 opcode->name;
360 opcode++, maskptr++)
361 {
362 if ((opcode->isa == AVR_ISA_TINY) && (info->mach != bfd_mach_avrtiny))
363 continue;
364 if ((insn & *maskptr) == opcode->bin_opcode)
365 break;
366 }
367
368 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
369 `std b+0,r' as `st b,r' (next entry in the table). */
370
371 if (AVR_DISP0_P (insn))
372 opcode++;
373
374 op1[0] = 0;
375 op2[0] = 0;
376 comment1[0] = 0;
377 comment2[0] = 0;
378
379 if (opcode->name)
380 {
381 char *constraints = opcode->constraints;
382 char *opcode_str = opcode->opcode;
383
384 insn2 = 0;
385 ok = 1;
386
387 if (opcode->insn_size > 1)
388 {
389 if (avrdis_opcode (addr + 2, info, &insn2) != 0)
390 return -1;
391 cmd_len = 4;
392 }
393
394 if (*constraints && *constraints != '?')
395 {
396 int regs = REGISTER_P (*constraints);
397
398 ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1);
399
400 if (ok && *(++constraints) == ',')
401 ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2,
402 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
403 }
404 }
405
406 if (!ok)
407 {
408 /* Unknown opcode, or invalid combination of operands. */
409 sprintf (op1, "0x%04x", insn);
410 op2[0] = 0;
411 sprintf (comment1, "????");
412 comment2[0] = 0;
413 }
414
415 (*prin) (stream, "%s", ok ? opcode->name : ".word");
416
417 if (*op1)
418 (*prin) (stream, "\t%s", op1);
419
420 if (*op2)
421 (*prin) (stream, ", %s", op2);
422
423 if (*comment1)
424 (*prin) (stream, "\t; %s", comment1);
425
426 if (sym_op1)
427 info->print_address_func (sym_addr1, info);
428
429 if (*comment2)
430 (*prin) (stream, " %s", comment2);
431
432 if (sym_op2)
433 info->print_address_func (sym_addr2, info);
434
435 return cmd_len;
436 }
437