1 /* Disassembler interface for targets using CGEN. -*- C -*-
2 CGEN: Cpu tools GENerator
3
4 THIS FILE IS MACHINE GENERATED WITH CGEN.
5 - the resultant file is machine generated, cgen-dis.in isn't
6
7 Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2007,
8 2008, 2010 Free Software Foundation, Inc.
9
10 This file is part of libopcodes.
11
12 This library is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 3, or (at your option)
15 any later version.
16
17 It is distributed in the hope that it will be useful, but WITHOUT
18 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
20 License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software Foundation, Inc.,
24 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
25
26 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
27 Keep that in mind. */
28
29 #include "sysdep.h"
30 #include <stdio.h>
31 #include "ansidecl.h"
32 #include "dis-asm.h"
33 #include "bfd.h"
34 #include "symcat.h"
35 #include "libiberty.h"
36 #include "openrisc-desc.h"
37 #include "openrisc-opc.h"
38 #include "opintl.h"
39
40 /* Default text to print if an instruction isn't recognized. */
41 #define UNKNOWN_INSN_MSG _("*unknown*")
42
43 static void print_normal
44 (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
45 static void print_address
46 (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
47 static void print_keyword
48 (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
49 static void print_insn_normal
50 (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
51 static int print_insn
52 (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, unsigned);
53 static int default_print_insn
54 (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
55 static int read_insn
56 (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
57 unsigned long *);
58
59 /* -- disassembler routines inserted here. */
60
61
62 void openrisc_cgen_print_operand
63 (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
64
65 /* Main entry point for printing operands.
66 XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
67 of dis-asm.h on cgen.h.
68
69 This function is basically just a big switch statement. Earlier versions
70 used tables to look up the function to use, but
71 - if the table contains both assembler and disassembler functions then
72 the disassembler contains much of the assembler and vice-versa,
73 - there's a lot of inlining possibilities as things grow,
74 - using a switch statement avoids the function call overhead.
75
76 This function could be moved into `print_insn_normal', but keeping it
77 separate makes clear the interface between `print_insn_normal' and each of
78 the handlers. */
79
80 void
openrisc_cgen_print_operand(CGEN_CPU_DESC cd,int opindex,void * xinfo,CGEN_FIELDS * fields,void const * attrs ATTRIBUTE_UNUSED,bfd_vma pc,int length)81 openrisc_cgen_print_operand (CGEN_CPU_DESC cd,
82 int opindex,
83 void * xinfo,
84 CGEN_FIELDS *fields,
85 void const *attrs ATTRIBUTE_UNUSED,
86 bfd_vma pc,
87 int length)
88 {
89 disassemble_info *info = (disassemble_info *) xinfo;
90
91 switch (opindex)
92 {
93 case OPENRISC_OPERAND_ABS_26 :
94 print_address (cd, info, fields->f_abs26, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
95 break;
96 case OPENRISC_OPERAND_DISP_26 :
97 print_address (cd, info, fields->f_disp26, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
98 break;
99 case OPENRISC_OPERAND_HI16 :
100 print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
101 break;
102 case OPENRISC_OPERAND_LO16 :
103 print_normal (cd, info, fields->f_lo16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
104 break;
105 case OPENRISC_OPERAND_OP_F_23 :
106 print_normal (cd, info, fields->f_op4, 0, pc, length);
107 break;
108 case OPENRISC_OPERAND_OP_F_3 :
109 print_normal (cd, info, fields->f_op5, 0, pc, length);
110 break;
111 case OPENRISC_OPERAND_RA :
112 print_keyword (cd, info, & openrisc_cgen_opval_h_gr, fields->f_r2, 0);
113 break;
114 case OPENRISC_OPERAND_RB :
115 print_keyword (cd, info, & openrisc_cgen_opval_h_gr, fields->f_r3, 0);
116 break;
117 case OPENRISC_OPERAND_RD :
118 print_keyword (cd, info, & openrisc_cgen_opval_h_gr, fields->f_r1, 0);
119 break;
120 case OPENRISC_OPERAND_SIMM_16 :
121 print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
122 break;
123 case OPENRISC_OPERAND_UI16NC :
124 print_normal (cd, info, fields->f_i16nc, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
125 break;
126 case OPENRISC_OPERAND_UIMM_16 :
127 print_normal (cd, info, fields->f_uimm16, 0, pc, length);
128 break;
129 case OPENRISC_OPERAND_UIMM_5 :
130 print_normal (cd, info, fields->f_uimm5, 0, pc, length);
131 break;
132
133 default :
134 /* xgettext:c-format */
135 fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
136 opindex);
137 abort ();
138 }
139 }
140
141 cgen_print_fn * const openrisc_cgen_print_handlers[] =
142 {
143 print_insn_normal,
144 };
145
146
147 void
openrisc_cgen_init_dis(CGEN_CPU_DESC cd)148 openrisc_cgen_init_dis (CGEN_CPU_DESC cd)
149 {
150 openrisc_cgen_init_opcode_table (cd);
151 openrisc_cgen_init_ibld_table (cd);
152 cd->print_handlers = & openrisc_cgen_print_handlers[0];
153 cd->print_operand = openrisc_cgen_print_operand;
154 }
155
156
157 /* Default print handler. */
158
159 static void
print_normal(CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,void * dis_info,long value,unsigned int attrs,bfd_vma pc ATTRIBUTE_UNUSED,int length ATTRIBUTE_UNUSED)160 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
161 void *dis_info,
162 long value,
163 unsigned int attrs,
164 bfd_vma pc ATTRIBUTE_UNUSED,
165 int length ATTRIBUTE_UNUSED)
166 {
167 disassemble_info *info = (disassemble_info *) dis_info;
168
169 /* Print the operand as directed by the attributes. */
170 if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
171 ; /* nothing to do */
172 else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
173 (*info->fprintf_func) (info->stream, "%ld", value);
174 else
175 (*info->fprintf_func) (info->stream, "0x%lx", value);
176 }
177
178 /* Default address handler. */
179
180 static void
print_address(CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,void * dis_info,bfd_vma value,unsigned int attrs,bfd_vma pc ATTRIBUTE_UNUSED,int length ATTRIBUTE_UNUSED)181 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
182 void *dis_info,
183 bfd_vma value,
184 unsigned int attrs,
185 bfd_vma pc ATTRIBUTE_UNUSED,
186 int length ATTRIBUTE_UNUSED)
187 {
188 disassemble_info *info = (disassemble_info *) dis_info;
189
190 /* Print the operand as directed by the attributes. */
191 if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
192 ; /* Nothing to do. */
193 else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
194 (*info->print_address_func) (value, info);
195 else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
196 (*info->print_address_func) (value, info);
197 else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
198 (*info->fprintf_func) (info->stream, "%ld", (long) value);
199 else
200 (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
201 }
202
203 /* Keyword print handler. */
204
205 static void
print_keyword(CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,void * dis_info,CGEN_KEYWORD * keyword_table,long value,unsigned int attrs ATTRIBUTE_UNUSED)206 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
207 void *dis_info,
208 CGEN_KEYWORD *keyword_table,
209 long value,
210 unsigned int attrs ATTRIBUTE_UNUSED)
211 {
212 disassemble_info *info = (disassemble_info *) dis_info;
213 const CGEN_KEYWORD_ENTRY *ke;
214
215 ke = cgen_keyword_lookup_value (keyword_table, value);
216 if (ke != NULL)
217 (*info->fprintf_func) (info->stream, "%s", ke->name);
218 else
219 (*info->fprintf_func) (info->stream, "???");
220 }
221
222 /* Default insn printer.
223
224 DIS_INFO is defined as `void *' so the disassembler needn't know anything
225 about disassemble_info. */
226
227 static void
print_insn_normal(CGEN_CPU_DESC cd,void * dis_info,const CGEN_INSN * insn,CGEN_FIELDS * fields,bfd_vma pc,int length)228 print_insn_normal (CGEN_CPU_DESC cd,
229 void *dis_info,
230 const CGEN_INSN *insn,
231 CGEN_FIELDS *fields,
232 bfd_vma pc,
233 int length)
234 {
235 const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
236 disassemble_info *info = (disassemble_info *) dis_info;
237 const CGEN_SYNTAX_CHAR_TYPE *syn;
238
239 CGEN_INIT_PRINT (cd);
240
241 for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
242 {
243 if (CGEN_SYNTAX_MNEMONIC_P (*syn))
244 {
245 (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
246 continue;
247 }
248 if (CGEN_SYNTAX_CHAR_P (*syn))
249 {
250 (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
251 continue;
252 }
253
254 /* We have an operand. */
255 openrisc_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
256 fields, CGEN_INSN_ATTRS (insn), pc, length);
257 }
258 }
259
260 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
261 the extract info.
262 Returns 0 if all is well, non-zero otherwise. */
263
264 static int
read_insn(CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,bfd_vma pc,disassemble_info * info,bfd_byte * buf,int buflen,CGEN_EXTRACT_INFO * ex_info,unsigned long * insn_value)265 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
266 bfd_vma pc,
267 disassemble_info *info,
268 bfd_byte *buf,
269 int buflen,
270 CGEN_EXTRACT_INFO *ex_info,
271 unsigned long *insn_value)
272 {
273 int status = (*info->read_memory_func) (pc, buf, buflen, info);
274
275 if (status != 0)
276 {
277 (*info->memory_error_func) (status, pc, info);
278 return -1;
279 }
280
281 ex_info->dis_info = info;
282 ex_info->valid = (1 << buflen) - 1;
283 ex_info->insn_bytes = buf;
284
285 *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
286 return 0;
287 }
288
289 /* Utility to print an insn.
290 BUF is the base part of the insn, target byte order, BUFLEN bytes long.
291 The result is the size of the insn in bytes or zero for an unknown insn
292 or -1 if an error occurs fetching data (memory_error_func will have
293 been called). */
294
295 static int
print_insn(CGEN_CPU_DESC cd,bfd_vma pc,disassemble_info * info,bfd_byte * buf,unsigned int buflen)296 print_insn (CGEN_CPU_DESC cd,
297 bfd_vma pc,
298 disassemble_info *info,
299 bfd_byte *buf,
300 unsigned int buflen)
301 {
302 CGEN_INSN_INT insn_value;
303 const CGEN_INSN_LIST *insn_list;
304 CGEN_EXTRACT_INFO ex_info;
305 int basesize;
306
307 /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
308 basesize = cd->base_insn_bitsize < buflen * 8 ?
309 cd->base_insn_bitsize : buflen * 8;
310 insn_value = cgen_get_insn_value (cd, buf, basesize);
311
312
313 /* Fill in ex_info fields like read_insn would. Don't actually call
314 read_insn, since the incoming buffer is already read (and possibly
315 modified a la m32r). */
316 ex_info.valid = (1 << buflen) - 1;
317 ex_info.dis_info = info;
318 ex_info.insn_bytes = buf;
319
320 /* The instructions are stored in hash lists.
321 Pick the first one and keep trying until we find the right one. */
322
323 insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
324 while (insn_list != NULL)
325 {
326 const CGEN_INSN *insn = insn_list->insn;
327 CGEN_FIELDS fields;
328 int length;
329 unsigned long insn_value_cropped;
330
331 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
332 /* Not needed as insn shouldn't be in hash lists if not supported. */
333 /* Supported by this cpu? */
334 if (! openrisc_cgen_insn_supported (cd, insn))
335 {
336 insn_list = CGEN_DIS_NEXT_INSN (insn_list);
337 continue;
338 }
339 #endif
340
341 /* Basic bit mask must be correct. */
342 /* ??? May wish to allow target to defer this check until the extract
343 handler. */
344
345 /* Base size may exceed this instruction's size. Extract the
346 relevant part from the buffer. */
347 if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
348 (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
349 insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
350 info->endian == BFD_ENDIAN_BIG);
351 else
352 insn_value_cropped = insn_value;
353
354 if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
355 == CGEN_INSN_BASE_VALUE (insn))
356 {
357 /* Printing is handled in two passes. The first pass parses the
358 machine insn and extracts the fields. The second pass prints
359 them. */
360
361 /* Make sure the entire insn is loaded into insn_value, if it
362 can fit. */
363 if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
364 (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
365 {
366 unsigned long full_insn_value;
367 int rc = read_insn (cd, pc, info, buf,
368 CGEN_INSN_BITSIZE (insn) / 8,
369 & ex_info, & full_insn_value);
370 if (rc != 0)
371 return rc;
372 length = CGEN_EXTRACT_FN (cd, insn)
373 (cd, insn, &ex_info, full_insn_value, &fields, pc);
374 }
375 else
376 length = CGEN_EXTRACT_FN (cd, insn)
377 (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
378
379 /* Length < 0 -> error. */
380 if (length < 0)
381 return length;
382 if (length > 0)
383 {
384 CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
385 /* Length is in bits, result is in bytes. */
386 return length / 8;
387 }
388 }
389
390 insn_list = CGEN_DIS_NEXT_INSN (insn_list);
391 }
392
393 return 0;
394 }
395
396 /* Default value for CGEN_PRINT_INSN.
397 The result is the size of the insn in bytes or zero for an unknown insn
398 or -1 if an error occured fetching bytes. */
399
400 #ifndef CGEN_PRINT_INSN
401 #define CGEN_PRINT_INSN default_print_insn
402 #endif
403
404 static int
default_print_insn(CGEN_CPU_DESC cd,bfd_vma pc,disassemble_info * info)405 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
406 {
407 bfd_byte buf[CGEN_MAX_INSN_SIZE];
408 int buflen;
409 int status;
410
411 /* Attempt to read the base part of the insn. */
412 buflen = cd->base_insn_bitsize / 8;
413 status = (*info->read_memory_func) (pc, buf, buflen, info);
414
415 /* Try again with the minimum part, if min < base. */
416 if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
417 {
418 buflen = cd->min_insn_bitsize / 8;
419 status = (*info->read_memory_func) (pc, buf, buflen, info);
420 }
421
422 if (status != 0)
423 {
424 (*info->memory_error_func) (status, pc, info);
425 return -1;
426 }
427
428 return print_insn (cd, pc, info, buf, buflen);
429 }
430
431 /* Main entry point.
432 Print one instruction from PC on INFO->STREAM.
433 Return the size of the instruction (in bytes). */
434
435 typedef struct cpu_desc_list
436 {
437 struct cpu_desc_list *next;
438 CGEN_BITSET *isa;
439 int mach;
440 int endian;
441 CGEN_CPU_DESC cd;
442 } cpu_desc_list;
443
444 int
print_insn_openrisc(bfd_vma pc,disassemble_info * info)445 print_insn_openrisc (bfd_vma pc, disassemble_info *info)
446 {
447 static cpu_desc_list *cd_list = 0;
448 cpu_desc_list *cl = 0;
449 static CGEN_CPU_DESC cd = 0;
450 static CGEN_BITSET *prev_isa;
451 static int prev_mach;
452 static int prev_endian;
453 int length;
454 CGEN_BITSET *isa;
455 int mach;
456 int endian = (info->endian == BFD_ENDIAN_BIG
457 ? CGEN_ENDIAN_BIG
458 : CGEN_ENDIAN_LITTLE);
459 enum bfd_architecture arch;
460
461 /* ??? gdb will set mach but leave the architecture as "unknown" */
462 #ifndef CGEN_BFD_ARCH
463 #define CGEN_BFD_ARCH bfd_arch_openrisc
464 #endif
465 arch = info->arch;
466 if (arch == bfd_arch_unknown)
467 arch = CGEN_BFD_ARCH;
468
469 /* There's no standard way to compute the machine or isa number
470 so we leave it to the target. */
471 #ifdef CGEN_COMPUTE_MACH
472 mach = CGEN_COMPUTE_MACH (info);
473 #else
474 mach = info->mach;
475 #endif
476
477 #ifdef CGEN_COMPUTE_ISA
478 {
479 static CGEN_BITSET *permanent_isa;
480
481 if (!permanent_isa)
482 permanent_isa = cgen_bitset_create (MAX_ISAS);
483 isa = permanent_isa;
484 cgen_bitset_clear (isa);
485 cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
486 }
487 #else
488 isa = info->insn_sets;
489 #endif
490
491 /* If we've switched cpu's, try to find a handle we've used before */
492 if (cd
493 && (cgen_bitset_compare (isa, prev_isa) != 0
494 || mach != prev_mach
495 || endian != prev_endian))
496 {
497 cd = 0;
498 for (cl = cd_list; cl; cl = cl->next)
499 {
500 if (cgen_bitset_compare (cl->isa, isa) == 0 &&
501 cl->mach == mach &&
502 cl->endian == endian)
503 {
504 cd = cl->cd;
505 prev_isa = cd->isas;
506 break;
507 }
508 }
509 }
510
511 /* If we haven't initialized yet, initialize the opcode table. */
512 if (! cd)
513 {
514 const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
515 const char *mach_name;
516
517 if (!arch_type)
518 abort ();
519 mach_name = arch_type->printable_name;
520
521 prev_isa = cgen_bitset_copy (isa);
522 prev_mach = mach;
523 prev_endian = endian;
524 cd = openrisc_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
525 CGEN_CPU_OPEN_BFDMACH, mach_name,
526 CGEN_CPU_OPEN_ENDIAN, prev_endian,
527 CGEN_CPU_OPEN_END);
528 if (!cd)
529 abort ();
530
531 /* Save this away for future reference. */
532 cl = xmalloc (sizeof (struct cpu_desc_list));
533 cl->cd = cd;
534 cl->isa = prev_isa;
535 cl->mach = mach;
536 cl->endian = endian;
537 cl->next = cd_list;
538 cd_list = cl;
539
540 openrisc_cgen_init_dis (cd);
541 }
542
543 /* We try to have as much common code as possible.
544 But at this point some targets need to take over. */
545 /* ??? Some targets may need a hook elsewhere. Try to avoid this,
546 but if not possible try to move this hook elsewhere rather than
547 have two hooks. */
548 length = CGEN_PRINT_INSN (cd, pc, info);
549 if (length > 0)
550 return length;
551 if (length < 0)
552 return -1;
553
554 (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
555 return cd->default_insn_bitsize / 8;
556 }
557