1 /* Disassemble AVR instructions.
2 Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008, 2012
3 Free Software Foundation, Inc.
4
5 Contributed by Denis Chertykov <denisc@overta.ru>
6
7 This file is part of libopcodes.
8
9 This library is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
12 any later version.
13
14 It is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
17 License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22 MA 02110-1301, USA. */
23
24 #include "sysdep.h"
25 #include <assert.h>
26 #include "dis-asm.h"
27 #include "opintl.h"
28 #include "libiberty.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 sprintf (buf, "0x%04X", insn2);
189 break;
190
191 case 'M':
192 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
193 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
194 break;
195
196 case 'n':
197 sprintf (buf, "??");
198 fprintf (stderr, _("Internal disassembler error"));
199 ok = 0;
200 break;
201
202 case 'K':
203 {
204 unsigned int x;
205
206 x = (insn & 0xf) | ((insn >> 2) & 0x30);
207 sprintf (buf, "0x%02x", x);
208 sprintf (comment, "%d", x);
209 }
210 break;
211
212 case 's':
213 sprintf (buf, "%d", insn & 7);
214 break;
215
216 case 'S':
217 sprintf (buf, "%d", (insn >> 4) & 7);
218 break;
219
220 case 'P':
221 {
222 unsigned int x;
223
224 x = (insn & 0xf);
225 x |= (insn >> 5) & 0x30;
226 sprintf (buf, "0x%02x", x);
227 sprintf (comment, "%d", x);
228 }
229 break;
230
231 case 'p':
232 {
233 unsigned int x;
234
235 x = (insn >> 3) & 0x1f;
236 sprintf (buf, "0x%02x", x);
237 sprintf (comment, "%d", x);
238 }
239 break;
240
241 case 'E':
242 sprintf (buf, "%d", (insn >> 4) & 15);
243 break;
244
245 case '?':
246 *buf = '\0';
247 break;
248
249 default:
250 sprintf (buf, "??");
251 fprintf (stderr, _("unknown constraint `%c'"), constraint);
252 ok = 0;
253 }
254
255 return ok;
256 }
257
258 static unsigned short
avrdis_opcode(bfd_vma addr,disassemble_info * info)259 avrdis_opcode (bfd_vma addr, disassemble_info *info)
260 {
261 bfd_byte buffer[2];
262 int status;
263
264 status = info->read_memory_func (addr, buffer, 2, info);
265
266 if (status == 0)
267 return bfd_getl16 (buffer);
268
269 info->memory_error_func (status, addr, info);
270 return -1;
271 }
272
273
274 int
print_insn_avr(bfd_vma addr,disassemble_info * info)275 print_insn_avr (bfd_vma addr, disassemble_info *info)
276 {
277 unsigned int insn, insn2;
278 const struct avr_opcodes_s *opcode;
279 static unsigned int *maskptr;
280 void *stream = info->stream;
281 fprintf_ftype prin = info->fprintf_func;
282 static unsigned int *avr_bin_masks;
283 static int initialized;
284 int cmd_len = 2;
285 int ok = 0;
286 char op1[20], op2[20], comment1[40], comment2[40];
287 int sym_op1 = 0, sym_op2 = 0;
288 bfd_vma sym_addr1, sym_addr2;
289
290
291 if (!initialized)
292 {
293 unsigned int nopcodes;
294
295 /* PR 4045: Try to avoid duplicating the 0x prefix that
296 objdump_print_addr() will put on addresses when there
297 is no symbol table available. */
298 if (info->symtab_size == 0)
299 comment_start = " ";
300
301 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
302
303 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
304
305 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
306 opcode->name;
307 opcode++, maskptr++)
308 {
309 char * s;
310 unsigned int bin = 0;
311 unsigned int mask = 0;
312
313 for (s = opcode->opcode; *s; ++s)
314 {
315 bin <<= 1;
316 mask <<= 1;
317 bin |= (*s == '1');
318 mask |= (*s == '1' || *s == '0');
319 }
320 assert (s - opcode->opcode == 16);
321 assert (opcode->bin_opcode == bin);
322 *maskptr = mask;
323 }
324
325 initialized = 1;
326 }
327
328 insn = avrdis_opcode (addr, info);
329
330 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
331 opcode->name;
332 opcode++, maskptr++)
333 if ((insn & *maskptr) == opcode->bin_opcode)
334 break;
335
336 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
337 `std b+0,r' as `st b,r' (next entry in the table). */
338
339 if (AVR_DISP0_P (insn))
340 opcode++;
341
342 op1[0] = 0;
343 op2[0] = 0;
344 comment1[0] = 0;
345 comment2[0] = 0;
346
347 if (opcode->name)
348 {
349 char *constraints = opcode->constraints;
350 char *opcode_str = opcode->opcode;
351
352 insn2 = 0;
353 ok = 1;
354
355 if (opcode->insn_size > 1)
356 {
357 insn2 = avrdis_opcode (addr + 2, info);
358 cmd_len = 4;
359 }
360
361 if (*constraints && *constraints != '?')
362 {
363 int regs = REGISTER_P (*constraints);
364
365 ok = avr_operand (insn, insn2, addr, *constraints, opcode_str, op1, comment1, 0, &sym_op1, &sym_addr1);
366
367 if (ok && *(++constraints) == ',')
368 ok = avr_operand (insn, insn2, addr, *(++constraints), opcode_str, op2,
369 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
370 }
371 }
372
373 if (!ok)
374 {
375 /* Unknown opcode, or invalid combination of operands. */
376 sprintf (op1, "0x%04x", insn);
377 op2[0] = 0;
378 sprintf (comment1, "????");
379 comment2[0] = 0;
380 }
381
382 (*prin) (stream, "%s", ok ? opcode->name : ".word");
383
384 if (*op1)
385 (*prin) (stream, "\t%s", op1);
386
387 if (*op2)
388 (*prin) (stream, ", %s", op2);
389
390 if (*comment1)
391 (*prin) (stream, "\t; %s", comment1);
392
393 if (sym_op1)
394 info->print_address_func (sym_addr1, info);
395
396 if (*comment2)
397 (*prin) (stream, " %s", comment2);
398
399 if (sym_op2)
400 info->print_address_func (sym_addr2, info);
401
402 return cmd_len;
403 }
404