1 /* Print DEC PDP-11 instructions.
2 Copyright 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
4 This file is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
17 MA 02110-1301, USA. */
21 #include "opcode/pdp11.h"
23 #define AFTER_INSTRUCTION "\t"
24 #define OPERAND_SEPARATOR ", "
26 #define JUMP 0x1000 /* Flag that this operand is used in a jump. */
28 #define FPRINTF (*info->fprintf_func)
29 #define F info->stream
31 /* Sign-extend a 16-bit number in an int. */
32 #define SIGN_BITS (8 * sizeof (int) - 16)
33 #define sign_extend(x) (((x) << SIGN_BITS) >> SIGN_BITS)
36 read_word (bfd_vma memaddr
, int *word
, disassemble_info
*info
)
41 status
= (*info
->read_memory_func
) (memaddr
, x
, 2, info
);
45 *word
= x
[1] << 8 | x
[0];
50 print_signed_octal (int n
, disassemble_info
*info
)
53 FPRINTF (F
, "-%o", -n
);
59 print_reg (int reg
, disassemble_info
*info
)
61 /* Mask off the addressing mode, if any. */
66 case 0: case 1: case 2: case 3: case 4: case 5:
67 FPRINTF (F
, "r%d", reg
); break;
68 case 6: FPRINTF (F
, "sp"); break;
69 case 7: FPRINTF (F
, "pc"); break;
70 default: ; /* error */
75 print_freg (int freg
, disassemble_info
*info
)
77 FPRINTF (F
, "fr%d", freg
);
81 print_operand (bfd_vma
*memaddr
, int code
, disassemble_info
*info
)
83 int mode
= (code
>> 3) & 7;
90 print_reg (reg
, info
);
94 print_reg (reg
, info
);
102 if (read_word (*memaddr
, &data
, info
) < 0)
105 print_signed_octal (sign_extend (data
), info
);
111 print_reg (reg
, info
);
120 if (read_word (*memaddr
, &address
, info
) < 0)
122 FPRINTF (F
, "*$%o", address
);
128 print_reg (reg
, info
);
134 print_reg (reg
, info
);
139 print_reg (reg
, info
);
144 if (read_word (*memaddr
, &disp
, info
) < 0)
149 bfd_vma address
= *memaddr
+ sign_extend (disp
);
155 (*info
->print_address_func
) (address
, info
);
161 print_signed_octal (sign_extend (disp
), info
);
163 print_reg (reg
, info
);
173 print_foperand (bfd_vma
*memaddr
, int code
, disassemble_info
*info
)
175 int mode
= (code
>> 3) & 7;
179 print_freg (reg
, info
);
181 return print_operand (memaddr
, code
, info
);
186 /* Print the PDP-11 instruction at address MEMADDR in debugged memory,
187 on INFO->STREAM. Returns length of the instruction, in bytes. */
190 print_insn_pdp11 (bfd_vma memaddr
, disassemble_info
*info
)
192 bfd_vma start_memaddr
= memaddr
;
197 info
->bytes_per_line
= 6;
198 info
->bytes_per_chunk
= 2;
199 info
->display_endian
= BFD_ENDIAN_LITTLE
;
201 if (read_word (memaddr
, &opcode
, info
) != 0)
205 src
= (opcode
>> 6) & 0x3f;
208 for (i
= 0; i
< pdp11_num_opcodes
; i
++)
210 #define OP pdp11_opcodes[i]
211 if ((opcode
& OP
.mask
) == OP
.opcode
)
214 case PDP11_OPCODE_NO_OPS
:
215 FPRINTF (F
, OP
.name
);
217 case PDP11_OPCODE_REG
:
218 FPRINTF (F
, OP
.name
);
219 FPRINTF (F
, AFTER_INSTRUCTION
);
220 print_reg (dst
, info
);
222 case PDP11_OPCODE_OP
:
223 FPRINTF (F
, OP
.name
);
224 FPRINTF (F
, AFTER_INSTRUCTION
);
225 if (strcmp (OP
.name
, "jmp") == 0)
227 if (print_operand (&memaddr
, dst
, info
) < 0)
230 case PDP11_OPCODE_FOP
:
231 FPRINTF (F
, OP
.name
);
232 FPRINTF (F
, AFTER_INSTRUCTION
);
233 if (strcmp (OP
.name
, "jmp") == 0)
235 if (print_foperand (&memaddr
, dst
, info
) < 0)
238 case PDP11_OPCODE_REG_OP
:
239 FPRINTF (F
, OP
.name
);
240 FPRINTF (F
, AFTER_INSTRUCTION
);
241 print_reg (src
, info
);
242 FPRINTF (F
, OPERAND_SEPARATOR
);
243 if (strcmp (OP
.name
, "jsr") == 0)
245 if (print_operand (&memaddr
, dst
, info
) < 0)
248 case PDP11_OPCODE_REG_OP_REV
:
249 FPRINTF (F
, OP
.name
);
250 FPRINTF (F
, AFTER_INSTRUCTION
);
251 if (print_operand (&memaddr
, dst
, info
) < 0)
253 FPRINTF (F
, OPERAND_SEPARATOR
);
254 print_reg (src
, info
);
256 case PDP11_OPCODE_AC_FOP
:
258 int ac
= (opcode
& 0xe0) >> 6;
259 FPRINTF (F
, OP
.name
);
260 FPRINTF (F
, AFTER_INSTRUCTION
);
261 print_freg (ac
, info
);
262 FPRINTF (F
, OPERAND_SEPARATOR
);
263 if (print_foperand (&memaddr
, dst
, info
) < 0)
267 case PDP11_OPCODE_FOP_AC
:
269 int ac
= (opcode
& 0xe0) >> 6;
270 FPRINTF (F
, OP
.name
);
271 FPRINTF (F
, AFTER_INSTRUCTION
);
272 if (print_foperand (&memaddr
, dst
, info
) < 0)
274 FPRINTF (F
, OPERAND_SEPARATOR
);
275 print_freg (ac
, info
);
278 case PDP11_OPCODE_AC_OP
:
280 int ac
= (opcode
& 0xe0) >> 6;
281 FPRINTF (F
, OP
.name
);
282 FPRINTF (F
, AFTER_INSTRUCTION
);
283 print_freg (ac
, info
);
284 FPRINTF (F
, OPERAND_SEPARATOR
);
285 if (print_operand (&memaddr
, dst
, info
) < 0)
289 case PDP11_OPCODE_OP_AC
:
291 int ac
= (opcode
& 0xe0) >> 6;
292 FPRINTF (F
, OP
.name
);
293 FPRINTF (F
, AFTER_INSTRUCTION
);
294 if (print_operand (&memaddr
, dst
, info
) < 0)
296 FPRINTF (F
, OPERAND_SEPARATOR
);
297 print_freg (ac
, info
);
300 case PDP11_OPCODE_OP_OP
:
301 FPRINTF (F
, OP
.name
);
302 FPRINTF (F
, AFTER_INSTRUCTION
);
303 if (print_operand (&memaddr
, src
, info
) < 0)
305 FPRINTF (F
, OPERAND_SEPARATOR
);
306 if (print_operand (&memaddr
, dst
, info
) < 0)
309 case PDP11_OPCODE_DISPL
:
311 int displ
= (opcode
& 0xff) << 8;
312 bfd_vma address
= memaddr
+ (sign_extend (displ
) >> 7);
313 FPRINTF (F
, OP
.name
);
314 FPRINTF (F
, AFTER_INSTRUCTION
);
315 (*info
->print_address_func
) (address
, info
);
318 case PDP11_OPCODE_REG_DISPL
:
320 int displ
= (opcode
& 0x3f) << 10;
321 bfd_vma address
= memaddr
- (displ
>> 9);
323 FPRINTF (F
, OP
.name
);
324 FPRINTF (F
, AFTER_INSTRUCTION
);
325 print_reg (src
, info
);
326 FPRINTF (F
, OPERAND_SEPARATOR
);
327 (*info
->print_address_func
) (address
, info
);
330 case PDP11_OPCODE_IMM8
:
332 int code
= opcode
& 0xff;
333 FPRINTF (F
, OP
.name
);
334 FPRINTF (F
, AFTER_INSTRUCTION
);
335 FPRINTF (F
, "%o", code
);
338 case PDP11_OPCODE_IMM6
:
340 int code
= opcode
& 0x3f;
341 FPRINTF (F
, OP
.name
);
342 FPRINTF (F
, AFTER_INSTRUCTION
);
343 FPRINTF (F
, "%o", code
);
346 case PDP11_OPCODE_IMM3
:
348 int code
= opcode
& 7;
349 FPRINTF (F
, OP
.name
);
350 FPRINTF (F
, AFTER_INSTRUCTION
);
351 FPRINTF (F
, "%o", code
);
354 case PDP11_OPCODE_ILLEGAL
:
356 FPRINTF (F
, ".word");
357 FPRINTF (F
, AFTER_INSTRUCTION
);
358 FPRINTF (F
, "%o", opcode
);
362 /* TODO: is this a proper way of signalling an error? */
363 FPRINTF (F
, "<internal error: unrecognized instruction type>");
370 return memaddr
- start_memaddr
;
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