1 /* Disassemble AVR instructions.
2 Copyright (C) 1999-2014 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 sprintf (buf, "0x%04X", insn2);
188 break;
189
190 case 'j':
191 {
192 unsigned int val = ((insn & 0xf) | ((insn & 0x600) >> 5)
193 | ((insn & 0x100) >> 2));
194 if (val > 0 && !(insn & 0x100))
195 val |= 0x80;
196 sprintf (buf, "0x%02x", val);
197 sprintf (buf, "%d", val);
198 }
199 break;
200
201 case 'M':
202 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
203 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
204 break;
205
206 case 'n':
207 sprintf (buf, "??");
208 fprintf (stderr, _("Internal disassembler error"));
209 ok = 0;
210 break;
211
212 case 'K':
213 {
214 unsigned int x;
215
216 x = (insn & 0xf) | ((insn >> 2) & 0x30);
217 sprintf (buf, "0x%02x", x);
218 sprintf (comment, "%d", x);
219 }
220 break;
221
222 case 's':
223 sprintf (buf, "%d", insn & 7);
224 break;
225
226 case 'S':
227 sprintf (buf, "%d", (insn >> 4) & 7);
228 break;
229
230 case 'P':
231 {
232 unsigned int x;
233
234 x = (insn & 0xf);
235 x |= (insn >> 5) & 0x30;
236 sprintf (buf, "0x%02x", x);
237 sprintf (comment, "%d", x);
238 }
239 break;
240
241 case 'p':
242 {
243 unsigned int x;
244
245 x = (insn >> 3) & 0x1f;
246 sprintf (buf, "0x%02x", x);
247 sprintf (comment, "%d", x);
248 }
249 break;
250
251 case 'E':
252 sprintf (buf, "%d", (insn >> 4) & 15);
253 break;
254
255 case '?':
256 *buf = '\0';
257 break;
258
259 default:
260 sprintf (buf, "??");
261 fprintf (stderr, _("unknown constraint `%c'"), constraint);
262 ok = 0;
263 }
264
265 return ok;
266 }
267
268 static unsigned short
avrdis_opcode(bfd_vma addr,disassemble_info * info)269 avrdis_opcode (bfd_vma addr, disassemble_info *info)
270 {
271 bfd_byte buffer[2];
272 int status;
273
274 status = info->read_memory_func (addr, buffer, 2, info);
275
276 if (status == 0)
277 return bfd_getl16 (buffer);
278
279 info->memory_error_func (status, addr, info);
280 return -1;
281 }
282
283
284 int
print_insn_avr(bfd_vma addr,disassemble_info * info)285 print_insn_avr (bfd_vma addr, disassemble_info *info)
286 {
287 unsigned int insn, insn2;
288 const struct avr_opcodes_s *opcode;
289 static unsigned int *maskptr;
290 void *stream = info->stream;
291 fprintf_ftype prin = info->fprintf_func;
292 static unsigned int *avr_bin_masks;
293 static int initialized;
294 int cmd_len = 2;
295 int ok = 0;
296 char op1[20], op2[20], comment1[40], comment2[40];
297 int sym_op1 = 0, sym_op2 = 0;
298 bfd_vma sym_addr1, sym_addr2;
299
300
301 if (!initialized)
302 {
303 unsigned int nopcodes;
304
305 /* PR 4045: Try to avoid duplicating the 0x prefix that
306 objdump_print_addr() will put on addresses when there
307 is no symbol table available. */
308 if (info->symtab_size == 0)
309 comment_start = " ";
310
311 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
312
313 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
314
315 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
316 opcode->name;
317 opcode++, maskptr++)
318 {
319 char * s;
320 unsigned int bin = 0;
321 unsigned int mask = 0;
322
323 for (s = opcode->opcode; *s; ++s)
324 {
325 bin <<= 1;
326 mask <<= 1;
327 bin |= (*s == '1');
328 mask |= (*s == '1' || *s == '0');
329 }
330 assert (s - opcode->opcode == 16);
331 assert (opcode->bin_opcode == bin);
332 *maskptr = mask;
333 }
334
335 initialized = 1;
336 }
337
338 insn = avrdis_opcode (addr, info);
339
340 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
341 opcode->name;
342 opcode++, maskptr++)
343 {
344 if ((opcode->isa == AVR_ISA_TINY) && (info->mach != bfd_mach_avrtiny))
345 continue;
346 if ((insn & *maskptr) == opcode->bin_opcode)
347 break;
348 }
349
350 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
351 `std b+0,r' as `st b,r' (next entry in the table). */
352
353 if (AVR_DISP0_P (insn))
354 opcode++;
355
356 op1[0] = 0;
357 op2[0] = 0;
358 comment1[0] = 0;
359 comment2[0] = 0;
360
361 if (opcode->name)
362 {
363 char *constraints = opcode->constraints;
364 char *opcode_str = opcode->opcode;
365
366 insn2 = 0;
367 ok = 1;
368
369 if (opcode->insn_size > 1)
370 {
371 insn2 = avrdis_opcode (addr + 2, info);
372 cmd_len = 4;
373 }
374
375 if (*constraints && *constraints != '?')
376 {
377 int regs = REGISTER_P (*constraints);
378
379 ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1);
380
381 if (ok && *(++constraints) == ',')
382 ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2,
383 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
384 }
385 }
386
387 if (!ok)
388 {
389 /* Unknown opcode, or invalid combination of operands. */
390 sprintf (op1, "0x%04x", insn);
391 op2[0] = 0;
392 sprintf (comment1, "????");
393 comment2[0] = 0;
394 }
395
396 (*prin) (stream, "%s", ok ? opcode->name : ".word");
397
398 if (*op1)
399 (*prin) (stream, "\t%s", op1);
400
401 if (*op2)
402 (*prin) (stream, ", %s", op2);
403
404 if (*comment1)
405 (*prin) (stream, "\t; %s", comment1);
406
407 if (sym_op1)
408 info->print_address_func (sym_addr1, info);
409
410 if (*comment2)
411 (*prin) (stream, " %s", comment2);
412
413 if (sym_op2)
414 info->print_address_func (sym_addr2, info);
415
416 return cmd_len;
417 }
418