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[binutils.git] / opcodes / avr-dis.c
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1 /* Disassemble AVR instructions.
2 Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008
3 Free Software Foundation, Inc.
5 Contributed by Denis Chertykov <denisc@overta.ru>
7 This file is part of libopcodes.
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.
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.
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. */
24 #include <assert.h>
25 #include "sysdep.h"
26 #include "dis-asm.h"
27 #include "opintl.h"
28 #include "libiberty.h"
30 struct avr_opcodes_s
32 char *name;
33 char *constraints;
34 char *opcode;
35 int insn_size; /* In words. */
36 int isa;
37 unsigned int bin_opcode;
40 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
41 {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},
43 const struct avr_opcodes_s avr_opcodes[] =
45 #include "opcode/avr.h"
46 {NULL, NULL, NULL, 0, 0, 0}
49 static const char * comment_start = "0x";
51 static int
52 avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,
53 char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
55 int ok = 1;
56 *sym = 0;
58 switch (constraint)
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. */
67 sprintf (buf, "r%d", insn);
68 break;
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;
77 case 'w':
78 sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
79 break;
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;
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;
95 case 'e':
97 char *xyz;
99 switch (insn & 0x100f)
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;
112 strcpy (buf, xyz);
114 if (AVR_UNDEF_P (insn))
115 sprintf (comment, _("undefined"));
117 break;
119 case 'z':
120 *buf++ = 'Z';
121 if (insn & 0x1)
122 *buf++ = '+';
123 *buf = '\0';
124 if (AVR_UNDEF_P (insn))
125 sprintf (comment, _("undefined"));
126 break;
128 case 'b':
130 unsigned int x;
132 x = (insn & 7);
133 x |= (insn >> 7) & (3 << 3);
134 x |= (insn >> 8) & (1 << 5);
136 if (insn & 0x8)
137 *buf++ = 'Y';
138 else
139 *buf++ = 'Z';
140 sprintf (buf, "+%d", x);
141 sprintf (comment, "0x%02x", x);
143 break;
145 case 'h':
146 *sym = 1;
147 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
148 /* See PR binutils/2454. Ideally we would like to display the hex
149 value of the address only once, but this would mean recoding
150 objdump_print_address() which would affect many targets. */
151 sprintf (buf, "%#lx", (unsigned long) *sym_addr);
152 strcpy (comment, comment_start);
153 break;
155 case 'L':
157 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
158 sprintf (buf, ".%+-8d", rel_addr);
159 *sym = 1;
160 *sym_addr = pc + 2 + rel_addr;
161 strcpy (comment, comment_start);
163 break;
165 case 'l':
167 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
169 sprintf (buf, ".%+-8d", rel_addr);
170 *sym = 1;
171 *sym_addr = pc + 2 + rel_addr;
172 strcpy (comment, comment_start);
174 break;
176 case 'i':
177 sprintf (buf, "0x%04X", insn2);
178 break;
180 case 'M':
181 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
182 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
183 break;
185 case 'n':
186 sprintf (buf, "??");
187 fprintf (stderr, _("Internal disassembler error"));
188 ok = 0;
189 break;
191 case 'K':
193 unsigned int x;
195 x = (insn & 0xf) | ((insn >> 2) & 0x30);
196 sprintf (buf, "0x%02x", x);
197 sprintf (comment, "%d", x);
199 break;
201 case 's':
202 sprintf (buf, "%d", insn & 7);
203 break;
205 case 'S':
206 sprintf (buf, "%d", (insn >> 4) & 7);
207 break;
209 case 'P':
211 unsigned int x;
213 x = (insn & 0xf);
214 x |= (insn >> 5) & 0x30;
215 sprintf (buf, "0x%02x", x);
216 sprintf (comment, "%d", x);
218 break;
220 case 'p':
222 unsigned int x;
224 x = (insn >> 3) & 0x1f;
225 sprintf (buf, "0x%02x", x);
226 sprintf (comment, "%d", x);
228 break;
230 case '?':
231 *buf = '\0';
232 break;
234 default:
235 sprintf (buf, "??");
236 fprintf (stderr, _("unknown constraint `%c'"), constraint);
237 ok = 0;
240 return ok;
243 static unsigned short
244 avrdis_opcode (bfd_vma addr, disassemble_info *info)
246 bfd_byte buffer[2];
247 int status;
249 status = info->read_memory_func (addr, buffer, 2, info);
251 if (status == 0)
252 return bfd_getl16 (buffer);
254 info->memory_error_func (status, addr, info);
255 return -1;
260 print_insn_avr (bfd_vma addr, disassemble_info *info)
262 unsigned int insn, insn2;
263 const struct avr_opcodes_s *opcode;
264 static unsigned int *maskptr;
265 void *stream = info->stream;
266 fprintf_ftype prin = info->fprintf_func;
267 static unsigned int *avr_bin_masks;
268 static int initialized;
269 int cmd_len = 2;
270 int ok = 0;
271 char op1[20], op2[20], comment1[40], comment2[40];
272 int sym_op1 = 0, sym_op2 = 0;
273 bfd_vma sym_addr1, sym_addr2;
276 if (!initialized)
278 unsigned int nopcodes;
280 /* PR 4045: Try to avoid duplicating the 0x prefix that
281 objdump_print_addr() will put on addresses when there
282 is no symbol table available. */
283 if (info->symtab_size == 0)
284 comment_start = " ";
286 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
288 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
290 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
291 opcode->name;
292 opcode++, maskptr++)
294 char * s;
295 unsigned int bin = 0;
296 unsigned int mask = 0;
298 for (s = opcode->opcode; *s; ++s)
300 bin <<= 1;
301 mask <<= 1;
302 bin |= (*s == '1');
303 mask |= (*s == '1' || *s == '0');
305 assert (s - opcode->opcode == 16);
306 assert (opcode->bin_opcode == bin);
307 *maskptr = mask;
310 initialized = 1;
313 insn = avrdis_opcode (addr, info);
315 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
316 opcode->name;
317 opcode++, maskptr++)
318 if ((insn & *maskptr) == opcode->bin_opcode)
319 break;
321 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
322 `std b+0,r' as `st b,r' (next entry in the table). */
324 if (AVR_DISP0_P (insn))
325 opcode++;
327 op1[0] = 0;
328 op2[0] = 0;
329 comment1[0] = 0;
330 comment2[0] = 0;
332 if (opcode->name)
334 char *op = opcode->constraints;
336 insn2 = 0;
337 ok = 1;
339 if (opcode->insn_size > 1)
341 insn2 = avrdis_opcode (addr + 2, info);
342 cmd_len = 4;
345 if (*op && *op != '?')
347 int regs = REGISTER_P (*op);
349 ok = avr_operand (insn, insn2, addr, *op, op1, comment1, 0, &sym_op1, &sym_addr1);
351 if (ok && *(++op) == ',')
352 ok = avr_operand (insn, insn2, addr, *(++op), op2,
353 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
357 if (!ok)
359 /* Unknown opcode, or invalid combination of operands. */
360 sprintf (op1, "0x%04x", insn);
361 op2[0] = 0;
362 sprintf (comment1, "????");
363 comment2[0] = 0;
366 (*prin) (stream, "%s", ok ? opcode->name : ".word");
368 if (*op1)
369 (*prin) (stream, "\t%s", op1);
371 if (*op2)
372 (*prin) (stream, ", %s", op2);
374 if (*comment1)
375 (*prin) (stream, "\t; %s", comment1);
377 if (sym_op1)
378 info->print_address_func (sym_addr1, info);
380 if (*comment2)
381 (*prin) (stream, " %s", comment2);
383 if (sym_op2)
384 info->print_address_func (sym_addr2, info);
386 return cmd_len;