1 /* Disassemble AVR instructions.
2 Copyright 1999, 2000, 2002, 2004, 2005 Free Software Foundation, Inc.
4 Contributed by Denis Chertykov <denisc@overta.ru>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
24 #include "libiberty.h"
31 int insn_size; /* In words. */
33 unsigned int bin_opcode;
36 #define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \
37 {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},
39 const struct avr_opcodes_s avr_opcodes[] =
41 #include "opcode/avr.h"
42 {NULL, NULL, NULL, 0, 0, 0}
46 avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,
47 char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)
54 /* Any register operand. */
57 insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register. */
59 insn = (insn & 0x01f0) >> 4; /* Destination register. */
61 sprintf (buf, "r%d", insn);
66 sprintf (buf, "r%d", 16 + (insn & 0xf));
68 sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));
72 sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));
77 sprintf (buf, "r%d", 16 + (insn & 7));
79 sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));
84 sprintf (buf, "r%d", (insn & 0xf) * 2);
86 sprintf (buf, "r%d", ((insn & 0xf0) >> 3));
93 switch (insn & 0x100f)
95 case 0x0000: xyz = "Z"; break;
96 case 0x1001: xyz = "Z+"; break;
97 case 0x1002: xyz = "-Z"; break;
98 case 0x0008: xyz = "Y"; break;
99 case 0x1009: xyz = "Y+"; break;
100 case 0x100a: xyz = "-Y"; break;
101 case 0x100c: xyz = "X"; break;
102 case 0x100d: xyz = "X+"; break;
103 case 0x100e: xyz = "-X"; break;
104 default: xyz = "??"; ok = 0;
108 if (AVR_UNDEF_P (insn))
109 sprintf (comment, _("undefined"));
118 if (AVR_UNDEF_P (insn))
119 sprintf (comment, _("undefined"));
127 x |= (insn >> 7) & (3 << 3);
128 x |= (insn >> 8) & (1 << 5);
134 sprintf (buf, "+%d", x);
135 sprintf (comment, "0x%02x", x);
141 *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;
142 /* See PR binutils/2545. Ideally we would like to display the hex
143 value of the address only once, but this would mean recoding
144 objdump_print_address() which would affect many targets. */
145 sprintf (buf, "%#lx", * sym_addr);
146 sprintf (comment, "0x");
152 int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;
153 sprintf (buf, ".%+-8d", rel_addr);
155 *sym_addr = pc + 2 + rel_addr;
156 sprintf (comment, "0x");
162 int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;
163 sprintf (buf, ".%+-8d", rel_addr);
165 *sym_addr = pc + 2 + rel_addr;
166 sprintf (comment, "0x");
171 sprintf (buf, "0x%04X", insn2);
175 sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));
176 sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));
181 fprintf (stderr, _("Internal disassembler error"));
189 x = (insn & 0xf) | ((insn >> 2) & 0x30);
190 sprintf (buf, "0x%02x", x);
191 sprintf (comment, "%d", x);
196 sprintf (buf, "%d", insn & 7);
200 sprintf (buf, "%d", (insn >> 4) & 7);
208 x |= (insn >> 5) & 0x30;
209 sprintf (buf, "0x%02x", x);
210 sprintf (comment, "%d", x);
218 x = (insn >> 3) & 0x1f;
219 sprintf (buf, "0x%02x", x);
220 sprintf (comment, "%d", x);
230 fprintf (stderr, _("unknown constraint `%c'"), constraint);
237 static unsigned short
238 avrdis_opcode (bfd_vma addr, disassemble_info *info)
243 status = info->read_memory_func (addr, buffer, 2, info);
246 return bfd_getl16 (buffer);
248 info->memory_error_func (status, addr, info);
254 print_insn_avr (bfd_vma addr, disassemble_info *info)
256 unsigned int insn, insn2;
257 const struct avr_opcodes_s *opcode;
258 static unsigned int *maskptr;
259 void *stream = info->stream;
260 fprintf_ftype prin = info->fprintf_func;
261 static unsigned int *avr_bin_masks;
262 static int initialized;
265 char op1[20], op2[20], comment1[40], comment2[40];
266 int sym_op1 = 0, sym_op2 = 0;
267 bfd_vma sym_addr1, sym_addr2;
271 unsigned int nopcodes;
273 nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);
275 avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));
277 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
282 unsigned int bin = 0;
283 unsigned int mask = 0;
285 for (s = opcode->opcode; *s; ++s)
290 mask |= (*s == '1' || *s == '0');
292 assert (s - opcode->opcode == 16);
293 assert (opcode->bin_opcode == bin);
300 insn = avrdis_opcode (addr, info);
302 for (opcode = avr_opcodes, maskptr = avr_bin_masks;
305 if ((insn & *maskptr) == opcode->bin_opcode)
308 /* Special case: disassemble `ldd r,b+0' as `ld r,b', and
309 `std b+0,r' as `st b,r' (next entry in the table). */
311 if (AVR_DISP0_P (insn))
321 char *op = opcode->constraints;
326 if (opcode->insn_size > 1)
328 insn2 = avrdis_opcode (addr + 2, info);
332 if (*op && *op != '?')
334 int regs = REGISTER_P (*op);
336 ok = avr_operand (insn, insn2, addr, *op, op1, comment1, 0, &sym_op1, &sym_addr1);
338 if (ok && *(++op) == ',')
339 ok = avr_operand (insn, insn2, addr, *(++op), op2,
340 *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);
346 /* Unknown opcode, or invalid combination of operands. */
347 sprintf (op1, "0x%04x", insn);
349 sprintf (comment1, "????");
353 (*prin) (stream, "%s", ok ? opcode->name : ".word");
356 (*prin) (stream, "\t%s", op1);
359 (*prin) (stream, ", %s", op2);
362 (*prin) (stream, "\t; %s", comment1);
365 info->print_address_func (sym_addr1, info);
368 (*prin) (stream, " %s", comment2);
371 info->print_address_func (sym_addr2, info);