source: trunk/src/binutils/opcodes/arc-dis.c@ 433

Last change on this file since 433 was 10, checked in by bird, 23 years ago

Initial revision
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  • Property svn:eol-style set to native
  • Property svn:executable set to *
File size: 27.9 KB
Line 
1/* Instruction printing code for the ARC.
2 Copyright 1994, 1995, 1997, 1998, 2000, 2001
3 Free Software Foundation, Inc.
4 Contributed by Doug Evans (dje@cygnus.com).
5
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.
10
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.
15
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19
20#include <ansidecl.h>
21#include <libiberty.h>
22#include "dis-asm.h"
23#include "opcode/arc.h"
24#include "elf-bfd.h"
25#include "elf/arc.h"
26#include <string.h>
27#include "opintl.h"
28
29#include <ctype.h>
30#include <stdarg.h>
31#include "arc-dis.h"
32#include "arc-ext.h"
33
34#ifndef dbg
35#define dbg (0)
36#endif
37
38#define BIT(word,n) ((word) & (1 << n))
39#define BITS(word,s,e) (((word) << (31 - e)) >> (s + (31 - e)))
40#define OPCODE(word) (BITS ((word), 27, 31))
41#define FIELDA(word) (BITS ((word), 21, 26))
42#define FIELDB(word) (BITS ((word), 15, 20))
43#define FIELDC(word) (BITS ((word), 9, 14))
44
45/* FIELD D is signed in all of its uses, so we make sure argument is
46 treated as signed for bit shifting purposes: */
47#define FIELDD(word) (BITS (((signed int)word), 0, 8))
48
49#define PUT_NEXT_WORD_IN(a) \
50 do \
51 { \
52 if (is_limm == 1 && !NEXT_WORD (1)) \
53 mwerror (state, _("Illegal limm reference in last instruction!\n")); \
54 a = state->words[1]; \
55 } \
56 while (0)
57
58#define CHECK_FLAG_COND_NULLIFY() \
59 do \
60 { \
61 if (is_shimm == 0) \
62 { \
63 flag = BIT (state->words[0], 8); \
64 state->nullifyMode = BITS (state->words[0], 5, 6); \
65 cond = BITS (state->words[0], 0, 4); \
66 } \
67 } \
68 while (0)
69
70#define CHECK_COND() \
71 do \
72 { \
73 if (is_shimm == 0) \
74 cond = BITS (state->words[0], 0, 4); \
75 } \
76 while (0)
77
78#define CHECK_FIELD(field) \
79 do \
80 { \
81 if (field == 62) \
82 { \
83 is_limm++; \
84 field##isReg = 0; \
85 PUT_NEXT_WORD_IN (field); \
86 limm_value = field; \
87 } \
88 else if (field > 60) \
89 { \
90 field##isReg = 0; \
91 is_shimm++; \
92 flag = (field == 61); \
93 field = FIELDD (state->words[0]); \
94 } \
95 } \
96 while (0)
97
98#define CHECK_FIELD_A() \
99 do \
100 { \
101 fieldA = FIELDA(state->words[0]); \
102 if (fieldA > 60) \
103 { \
104 fieldAisReg = 0; \
105 fieldA = 0; \
106 } \
107 } \
108 while (0)
109
110#define CHECK_FIELD_B() \
111 do \
112 { \
113 fieldB = FIELDB (state->words[0]); \
114 CHECK_FIELD (fieldB); \
115 } \
116 while (0)
117
118#define CHECK_FIELD_C() \
119 do \
120 { \
121 fieldC = FIELDC (state->words[0]); \
122 CHECK_FIELD (fieldC); \
123 } \
124 while (0)
125
126#define IS_SMALL(x) (((field##x) < 256) && ((field##x) > -257))
127#define IS_REG(x) (field##x##isReg)
128#define WRITE_FORMAT_LB_Rx_RB(x) WRITE_FORMAT(x,"[","]","","")
129#define WRITE_FORMAT_x_COMMA_LB(x) WRITE_FORMAT(x,"",",[","",",[")
130#define WRITE_FORMAT_COMMA_x_RB(x) WRITE_FORMAT(x,",","]",",","]")
131#define WRITE_FORMAT_x_RB(x) WRITE_FORMAT(x,"","]","","]")
132#define WRITE_FORMAT_COMMA_x(x) WRITE_FORMAT(x,",","",",","")
133#define WRITE_FORMAT_x_COMMA(x) WRITE_FORMAT(x,"",",","",",")
134#define WRITE_FORMAT_x(x) WRITE_FORMAT(x,"","","","")
135#define WRITE_FORMAT(x,cb1,ca1,cb,ca) strcat (formatString, \
136 (IS_REG (x) ? cb1"%r"ca1 : \
137 usesAuxReg ? cb"%a"ca : \
138 IS_SMALL (x) ? cb"%d"ca : cb"%h"ca))
139#define WRITE_FORMAT_RB() strcat (formatString, "]")
140#define WRITE_COMMENT(str) (state->comm[state->commNum++] = (str))
141#define WRITE_NOP_COMMENT() if (!fieldAisReg && !flag) WRITE_COMMENT ("nop");
142
143#define NEXT_WORD(x) (offset += 4, state->words[x])
144
145#define add_target(x) (state->targets[state->tcnt++] = (x))
146
147static char comment_prefix[] = "\t; ";
148
149static const char *
150core_reg_name (state, val)
151 struct arcDisState * state;
152 int val;
153{
154 if (state->coreRegName)
155 return (*state->coreRegName)(state->_this, val);
156 return 0;
157}
158
159static const char *
160aux_reg_name (state, val)
161 struct arcDisState * state;
162 int val;
163{
164 if (state->auxRegName)
165 return (*state->auxRegName)(state->_this, val);
166 return 0;
167}
168
169static const char *
170cond_code_name (state, val)
171 struct arcDisState * state;
172 int val;
173{
174 if (state->condCodeName)
175 return (*state->condCodeName)(state->_this, val);
176 return 0;
177}
178
179static const char *
180instruction_name (state, op1, op2, flags)
181 struct arcDisState * state;
182 int op1;
183 int op2;
184 int * flags;
185{
186 if (state->instName)
187 return (*state->instName)(state->_this, op1, op2, flags);
188 return 0;
189}
190
191static void
192mwerror (state, msg)
193 struct arcDisState * state;
194 const char * msg;
195{
196 if (state->err != 0)
197 (*state->err)(state->_this, (msg));
198}
199
200static const char *
201post_address (state, addr)
202 struct arcDisState * state;
203 int addr;
204{
205 static char id[3 * ARRAY_SIZE (state->addresses)];
206 int j, i = state->acnt;
207
208 if (i < ((int) ARRAY_SIZE (state->addresses)))
209 {
210 state->addresses[i] = addr;
211 ++state->acnt;
212 j = i*3;
213 id[j+0] = '@';
214 id[j+1] = '0'+i;
215 id[j+2] = 0;
216
217 return id + j;
218 }
219 return "";
220}
221
222static void
223my_sprintf (
224 struct arcDisState * state,
225 char * buf,
226 const char * format,
227 ...)
228{
229 char *bp;
230 const char *p;
231 int size, leading_zero, regMap[2];
232 long auxNum;
233 va_list ap;
234
235 va_start (ap, format);
236
237 bp = buf;
238 *bp = 0;
239 p = format;
240 auxNum = -1;
241 regMap[0] = 0;
242 regMap[1] = 0;
243
244 while (1)
245 switch (*p++)
246 {
247 case 0:
248 goto DOCOMM; /* (return) */
249 default:
250 *bp++ = p[-1];
251 break;
252 case '%':
253 size = 0;
254 leading_zero = 0;
255 RETRY: ;
256 switch (*p++)
257 {
258 case '0':
259 case '1':
260 case '2':
261 case '3':
262 case '4':
263 case '5':
264 case '6':
265 case '7':
266 case '8':
267 case '9':
268 {
269 /* size. */
270 size = p[-1] - '0';
271 if (size == 0)
272 leading_zero = 1; /* e.g. %08x */
273 while (*p >= '0' && *p <= '9')
274 {
275 size = size * 10 + *p - '0';
276 p++;
277 }
278 goto RETRY;
279 }
280#define inc_bp() bp = bp + strlen (bp)
281
282 case 'h':
283 {
284 unsigned u = va_arg (ap, int);
285
286 /* Hex. We can change the format to 0x%08x in
287 one place, here, if we wish.
288 We add underscores for easy reading. */
289 if (u > 65536)
290 sprintf (bp, "0x%x_%04x", u >> 16, u & 0xffff);
291 else
292 sprintf (bp, "0x%x", u);
293 inc_bp ();
294 }
295 break;
296 case 'X': case 'x':
297 {
298 int val = va_arg (ap, int);
299
300 if (size != 0)
301 if (leading_zero)
302 sprintf (bp, "%0*x", size, val);
303 else
304 sprintf (bp, "%*x", size, val);
305 else
306 sprintf (bp, "%x", val);
307 inc_bp ();
308 }
309 break;
310 case 'd':
311 {
312 int val = va_arg (ap, int);
313
314 if (size != 0)
315 sprintf (bp, "%*d", size, val);
316 else
317 sprintf (bp, "%d", val);
318 inc_bp ();
319 }
320 break;
321 case 'r':
322 {
323 /* Register. */
324 int val = va_arg (ap, int);
325
326#define REG2NAME(num, name) case num: sprintf (bp, ""name); \
327 regMap[(num < 32) ? 0 : 1] |= 1 << (num - ((num < 32) ? 0 : 32)); break;
328
329 switch (val)
330 {
331 REG2NAME (26, "gp");
332 REG2NAME (27, "fp");
333 REG2NAME (28, "sp");
334 REG2NAME (29, "ilink1");
335 REG2NAME (30, "ilink2");
336 REG2NAME (31, "blink");
337 REG2NAME (60, "lp_count");
338 default:
339 {
340 const char * ext;
341
342 ext = core_reg_name (state, val);
343 if (ext)
344 sprintf (bp, "%s", ext);
345 else
346 sprintf (bp,"r%d",val);
347 }
348 break;
349 }
350 inc_bp ();
351 } break;
352
353 case 'a':
354 {
355 /* Aux Register. */
356 int val = va_arg (ap, int);
357
358#define AUXREG2NAME(num, name) case num: sprintf (bp,name); break;
359
360 switch (val)
361 {
362 AUXREG2NAME (0x0, "status");
363 AUXREG2NAME (0x1, "semaphore");
364 AUXREG2NAME (0x2, "lp_start");
365 AUXREG2NAME (0x3, "lp_end");
366 AUXREG2NAME (0x4, "identity");
367 AUXREG2NAME (0x5, "debug");
368 default:
369 {
370 const char *ext;
371
372 ext = aux_reg_name (state, val);
373 if (ext)
374 sprintf (bp, "%s", ext);
375 else
376 my_sprintf (state, bp, "%h", val);
377 }
378 break;
379 }
380 inc_bp ();
381 }
382 break;
383
384 case 's':
385 {
386 sprintf (bp, "%s", va_arg (ap, char *));
387 inc_bp ();
388 }
389 break;
390
391 default:
392 fprintf (stderr, "?? format %c\n", p[-1]);
393 break;
394 }
395 }
396
397 DOCOMM: *bp = 0;
398}
399
400static void
401write_comments_(state, shimm, is_limm, limm_value)
402 struct arcDisState * state;
403 int shimm;
404 int is_limm;
405 long limm_value;
406{
407 if (state->commentBuffer != 0)
408 {
409 int i;
410
411 if (is_limm)
412 {
413 const char *name = post_address (state, limm_value + shimm);
414
415 if (*name != 0)
416 WRITE_COMMENT (name);
417 }
418 for (i = 0; i < state->commNum; i++)
419 {
420 if (i == 0)
421 strcpy (state->commentBuffer, comment_prefix);
422 else
423 strcat (state->commentBuffer, ", ");
424 strncat (state->commentBuffer, state->comm[i], sizeof (state->commentBuffer));
425 }
426 }
427}
428
429#define write_comments2(x) write_comments_(state, x, is_limm, limm_value)
430#define write_comments() write_comments2(0)
431
432static const char *condName[] = {
433 /* 0..15. */
434 "" , "z" , "nz" , "p" , "n" , "c" , "nc" , "v" ,
435 "nv" , "gt" , "ge" , "lt" , "le" , "hi" , "ls" , "pnz"
436};
437
438static void
439write_instr_name_(state, instrName, cond, condCodeIsPartOfName, flag, signExtend, addrWriteBack, directMem)
440 struct arcDisState * state;
441 const char * instrName;
442 int cond;
443 int condCodeIsPartOfName;
444 int flag;
445 int signExtend;
446 int addrWriteBack;
447 int directMem;
448{
449 strcpy (state->instrBuffer, instrName);
450
451 if (cond > 0)
452 {
453 const char *cc = 0;
454
455 if (!condCodeIsPartOfName)
456 strcat (state->instrBuffer, ".");
457
458 if (cond < 16)
459 cc = condName[cond];
460 else
461 cc = cond_code_name (state, cond);
462
463 if (!cc)
464 cc = "???";
465
466 strcat (state->instrBuffer, cc);
467 }
468
469 if (flag)
470 strcat (state->instrBuffer, ".f");
471
472 switch (state->nullifyMode)
473 {
474 case BR_exec_always:
475 strcat (state->instrBuffer, ".d");
476 break;
477 case BR_exec_when_jump:
478 strcat (state->instrBuffer, ".jd");
479 break;
480 }
481
482 if (signExtend)
483 strcat (state->instrBuffer, ".x");
484
485 if (addrWriteBack)
486 strcat (state->instrBuffer, ".a");
487
488 if (directMem)
489 strcat (state->instrBuffer, ".di");
490}
491
492#define write_instr_name() \
493 do \
494 { \
495 write_instr_name_(state, instrName,cond, condCodeIsPartOfName, \
496 flag, signExtend, addrWriteBack, directMem); \
497 formatString[0] = '\0'; \
498 } \
499 while (0)
500
501enum {
502 op_LD0 = 0, op_LD1 = 1, op_ST = 2, op_3 = 3,
503 op_BC = 4, op_BLC = 5, op_LPC = 6, op_JC = 7,
504 op_ADD = 8, op_ADC = 9, op_SUB = 10, op_SBC = 11,
505 op_AND = 12, op_OR = 13, op_BIC = 14, op_XOR = 15
506};
507
508extern disassemble_info tm_print_insn_info;
509
510static int
511dsmOneArcInst (addr, state)
512 bfd_vma addr;
513 struct arcDisState * state;
514{
515 int condCodeIsPartOfName = 0;
516 int decodingClass;
517 const char * instrName;
518 int repeatsOp = 0;
519 int fieldAisReg = 1;
520 int fieldBisReg = 1;
521 int fieldCisReg = 1;
522 int fieldA;
523 int fieldB;
524 int fieldC = 0;
525 int flag = 0;
526 int cond = 0;
527 int is_shimm = 0;
528 int is_limm = 0;
529 long limm_value = 0;
530 int signExtend = 0;
531 int addrWriteBack = 0;
532 int directMem = 0;
533 int is_linked = 0;
534 int offset = 0;
535 int usesAuxReg = 0;
536 int flags;
537 int ignoreFirstOpd;
538 char formatString[60];
539
540 state->instructionLen = 4;
541 state->nullifyMode = BR_exec_when_no_jump;
542 state->opWidth = 12;
543 state->isBranch = 0;
544
545 state->_mem_load = 0;
546 state->_ea_present = 0;
547 state->_load_len = 0;
548 state->ea_reg1 = no_reg;
549 state->ea_reg2 = no_reg;
550 state->_offset = 0;
551
552 if (! NEXT_WORD (0))
553 return 0;
554
555 state->_opcode = OPCODE (state->words[0]);
556 instrName = 0;
557 decodingClass = 0; /* default! */
558 repeatsOp = 0;
559 condCodeIsPartOfName=0;
560 state->commNum = 0;
561 state->tcnt = 0;
562 state->acnt = 0;
563 state->flow = noflow;
564 ignoreFirstOpd = 0;
565
566 if (state->commentBuffer)
567 state->commentBuffer[0] = '\0';
568
569 switch (state->_opcode)
570 {
571 case op_LD0:
572 switch (BITS (state->words[0],1,2))
573 {
574 case 0:
575 instrName = "ld";
576 state->_load_len = 4;
577 break;
578 case 1:
579 instrName = "ldb";
580 state->_load_len = 1;
581 break;
582 case 2:
583 instrName = "ldw";
584 state->_load_len = 2;
585 break;
586 default:
587 instrName = "??? (0[3])";
588 state->flow = invalid_instr;
589 break;
590 }
591 decodingClass = 5;
592 break;
593
594 case op_LD1:
595 if (BIT (state->words[0],13))
596 {
597 instrName = "lr";
598 decodingClass = 10;
599 }
600 else
601 {
602 switch (BITS (state->words[0],10,11))
603 {
604 case 0:
605 instrName = "ld";
606 state->_load_len = 4;
607 break;
608 case 1:
609 instrName = "ldb";
610 state->_load_len = 1;
611 break;
612 case 2:
613 instrName = "ldw";
614 state->_load_len = 2;
615 break;
616 default:
617 instrName = "??? (1[3])";
618 state->flow = invalid_instr;
619 break;
620 }
621 decodingClass = 6;
622 }
623 break;
624
625 case op_ST:
626 if (BIT (state->words[0],25))
627 {
628 instrName = "sr";
629 decodingClass = 8;
630 }
631 else
632 {
633 switch (BITS (state->words[0],22,23))
634 {
635 case 0:
636 instrName = "st";
637 break;
638 case 1:
639 instrName = "stb";
640 break;
641 case 2:
642 instrName = "stw";
643 break;
644 default:
645 instrName = "??? (2[3])";
646 state->flow = invalid_instr;
647 break;
648 }
649 decodingClass = 7;
650 }
651 break;
652
653 case op_3:
654 decodingClass = 1; /* default for opcode 3... */
655 switch (FIELDC (state->words[0]))
656 {
657 case 0:
658 instrName = "flag";
659 decodingClass = 2;
660 break;
661 case 1:
662 instrName = "asr";
663 break;
664 case 2:
665 instrName = "lsr";
666 break;
667 case 3:
668 instrName = "ror";
669 break;
670 case 4:
671 instrName = "rrc";
672 break;
673 case 5:
674 instrName = "sexb";
675 break;
676 case 6:
677 instrName = "sexw";
678 break;
679 case 7:
680 instrName = "extb";
681 break;
682 case 8:
683 instrName = "extw";
684 break;
685 case 0x3f:
686 {
687 decodingClass = 9;
688 switch( FIELDD (state->words[0]) )
689 {
690 case 0:
691 instrName = "brk";
692 break;
693 case 1:
694 instrName = "sleep";
695 break;
696 case 2:
697 instrName = "swi";
698 break;
699 default:
700 instrName = "???";
701 state->flow=invalid_instr;
702 break;
703 }
704 }
705 break;
706
707 /* ARC Extension Library Instructions
708 NOTE: We assume that extension codes are these instrs. */
709 default:
710 instrName = instruction_name (state,
711 state->_opcode,
712 FIELDC (state->words[0]),
713 & flags);
714 if (!instrName)
715 {
716 instrName = "???";
717 state->flow = invalid_instr;
718 }
719 if (flags & IGNORE_FIRST_OPD)
720 ignoreFirstOpd = 1;
721 break;
722 }
723 break;
724
725 case op_BC:
726 instrName = "b";
727 case op_BLC:
728 if (!instrName)
729 instrName = "bl";
730 case op_LPC:
731 if (!instrName)
732 instrName = "lp";
733 case op_JC:
734 if (!instrName)
735 {
736 if (BITS (state->words[0],9,9))
737 {
738 instrName = "jl";
739 is_linked = 1;
740 }
741 else
742 {
743 instrName = "j";
744 is_linked = 0;
745 }
746 }
747 condCodeIsPartOfName = 1;
748 decodingClass = ((state->_opcode == op_JC) ? 4 : 3);
749 state->isBranch = 1;
750 break;
751
752 case op_ADD:
753 case op_ADC:
754 case op_AND:
755 repeatsOp = (FIELDC (state->words[0]) == FIELDB (state->words[0]));
756 decodingClass = 0;
757
758 switch (state->_opcode)
759 {
760 case op_ADD:
761 instrName = (repeatsOp ? "asl" : "add");
762 break;
763 case op_ADC:
764 instrName = (repeatsOp ? "rlc" : "adc");
765 break;
766 case op_AND:
767 instrName = (repeatsOp ? "mov" : "and");
768 break;
769 }
770 break;
771
772 case op_SUB: instrName = "sub";
773 break;
774 case op_SBC: instrName = "sbc";
775 break;
776 case op_OR: instrName = "or";
777 break;
778 case op_BIC: instrName = "bic";
779 break;
780
781 case op_XOR:
782 if (state->words[0] == 0x7fffffff)
783 {
784 /* nop encoded as xor -1, -1, -1 */
785 instrName = "nop";
786 decodingClass = 9;
787 }
788 else
789 instrName = "xor";
790 break;
791
792 default:
793 instrName = instruction_name (state,state->_opcode,0,&flags);
794 /* if (instrName) printf("FLAGS=0x%x\n", flags); */
795 if (!instrName)
796 {
797 instrName = "???";
798 state->flow=invalid_instr;
799 }
800 if (flags & IGNORE_FIRST_OPD)
801 ignoreFirstOpd = 1;
802 break;
803 }
804
805 fieldAisReg = fieldBisReg = fieldCisReg = 1; /* Assume regs for now. */
806 flag = cond = is_shimm = is_limm = 0;
807 state->nullifyMode = BR_exec_when_no_jump; /* 0 */
808 signExtend = addrWriteBack = directMem = 0;
809 usesAuxReg = 0;
810
811 switch (decodingClass)
812 {
813 case 0:
814 CHECK_FIELD_A ();
815 CHECK_FIELD_B ();
816 if (!repeatsOp)
817 CHECK_FIELD_C ();
818 CHECK_FLAG_COND_NULLIFY ();
819
820 write_instr_name ();
821 if (!ignoreFirstOpd)
822 {
823 WRITE_FORMAT_x (A);
824 WRITE_FORMAT_COMMA_x (B);
825 if (!repeatsOp)
826 WRITE_FORMAT_COMMA_x (C);
827 WRITE_NOP_COMMENT ();
828 my_sprintf (state, state->operandBuffer, formatString, fieldA, fieldB, fieldC);
829 }
830 else
831 {
832 WRITE_FORMAT_x (B);
833 if (!repeatsOp)
834 WRITE_FORMAT_COMMA_x (C);
835 my_sprintf (state, state->operandBuffer, formatString, fieldB, fieldC);
836 }
837 write_comments ();
838 break;
839
840 case 1:
841 CHECK_FIELD_A ();
842 CHECK_FIELD_B ();
843 CHECK_FLAG_COND_NULLIFY ();
844
845 write_instr_name ();
846 if (!ignoreFirstOpd)
847 {
848 WRITE_FORMAT_x (A);
849 WRITE_FORMAT_COMMA_x (B);
850 WRITE_NOP_COMMENT ();
851 my_sprintf (state, state->operandBuffer, formatString, fieldA, fieldB);
852 }
853 else
854 {
855 WRITE_FORMAT_x (B);
856 my_sprintf (state, state->operandBuffer, formatString, fieldB);
857 }
858 write_comments ();
859 break;
860
861 case 2:
862 CHECK_FIELD_B ();
863 CHECK_FLAG_COND_NULLIFY ();
864 flag = 0; /* this is the FLAG instruction -- it's redundant */
865
866 write_instr_name ();
867 WRITE_FORMAT_x (B);
868 my_sprintf (state, state->operandBuffer, formatString, fieldB);
869 write_comments ();
870 break;
871
872 case 3:
873 fieldA = BITS (state->words[0],7,26) << 2;
874 fieldA = (fieldA << 10) >> 10; /* make it signed */
875 fieldA += addr + 4;
876 CHECK_FLAG_COND_NULLIFY ();
877 flag = 0;
878
879 write_instr_name ();
880 /* This address could be a label we know. Convert it. */
881 if (state->_opcode != op_LPC /* LP */)
882 {
883 add_target (fieldA); /* For debugger. */
884 state->flow = state->_opcode == op_BLC /* BL */
885 ? direct_call
886 : direct_jump;
887 /* indirect calls are achieved by "lr blink,[status];
888 lr dest<- func addr; j [dest]" */
889 }
890
891 strcat (formatString, "%s"); /* address/label name */
892 my_sprintf (state, state->operandBuffer, formatString, post_address (state, fieldA));
893 write_comments ();
894 break;
895
896 case 4:
897 /* For op_JC -- jump to address specified.
898 Also covers jump and link--bit 9 of the instr. word
899 selects whether linked, thus "is_linked" is set above. */
900 fieldA = 0;
901 CHECK_FIELD_B ();
902 CHECK_FLAG_COND_NULLIFY ();
903
904 if (!fieldBisReg)
905 {
906 fieldAisReg = 0;
907 fieldA = (fieldB >> 25) & 0x7F; /* flags */
908 fieldB = (fieldB & 0xFFFFFF) << 2;
909 state->flow = is_linked ? direct_call : direct_jump;
910 add_target (fieldB);
911 /* screwy JLcc requires .jd mode to execute correctly
912 * but we pretend it is .nd (no delay slot). */
913 if (is_linked && state->nullifyMode == BR_exec_when_jump)
914 state->nullifyMode = BR_exec_when_no_jump;
915 }
916 else
917 {
918 state->flow = is_linked ? indirect_call : indirect_jump;
919 /* We should also treat this as indirect call if NOT linked
920 * but the preceding instruction was a "lr blink,[status]"
921 * and we have a delay slot with "add blink,blink,2".
922 * For now we can't detect such. */
923 state->register_for_indirect_jump = fieldB;
924 }
925
926 write_instr_name ();
927 strcat (formatString,
928 IS_REG (B) ? "[%r]" : "%s"); /* address/label name */
929 if (fieldA != 0)
930 {
931 fieldAisReg = 0;
932 WRITE_FORMAT_COMMA_x (A);
933 }
934 if (IS_REG (B))
935 my_sprintf (state, state->operandBuffer, formatString, fieldB, fieldA);
936 else
937 my_sprintf (state, state->operandBuffer, formatString,
938 post_address (state, fieldB), fieldA);
939 write_comments ();
940 break;
941
942 case 5:
943 /* LD instruction.
944 B and C can be regs, or one (both?) can be limm. */
945 CHECK_FIELD_A ();
946 CHECK_FIELD_B ();
947 CHECK_FIELD_C ();
948 if (dbg)
949 printf ("5:b reg %d %d c reg %d %d \n",
950 fieldBisReg,fieldB,fieldCisReg,fieldC);
951 state->_offset = 0;
952 state->_ea_present = 1;
953 if (fieldBisReg)
954 state->ea_reg1 = fieldB;
955 else
956 state->_offset += fieldB;
957 if (fieldCisReg)
958 state->ea_reg2 = fieldC;
959 else
960 state->_offset += fieldC;
961 state->_mem_load = 1;
962
963 directMem = BIT (state->words[0],5);
964 addrWriteBack = BIT (state->words[0],3);
965 signExtend = BIT (state->words[0],0);
966
967 write_instr_name ();
968 WRITE_FORMAT_x_COMMA_LB(A);
969 if (fieldBisReg || fieldB != 0)
970 WRITE_FORMAT_x_COMMA (B);
971 else
972 fieldB = fieldC;
973
974 WRITE_FORMAT_x_RB (C);
975 my_sprintf (state, state->operandBuffer, formatString, fieldA, fieldB, fieldC);
976 write_comments ();
977 break;
978
979 case 6:
980 /* LD instruction. */
981 CHECK_FIELD_B ();
982 CHECK_FIELD_A ();
983 fieldC = FIELDD (state->words[0]);
984
985 if (dbg)
986 printf ("6:b reg %d %d c 0x%x \n",
987 fieldBisReg, fieldB, fieldC);
988 state->_ea_present = 1;
989 state->_offset = fieldC;
990 state->_mem_load = 1;
991 if (fieldBisReg)
992 state->ea_reg1 = fieldB;
993 /* field B is either a shimm (same as fieldC) or limm (different!)
994 Say ea is not present, so only one of us will do the name lookup. */
995 else
996 state->_offset += fieldB, state->_ea_present = 0;
997
998 directMem = BIT (state->words[0],14);
999 addrWriteBack = BIT (state->words[0],12);
1000 signExtend = BIT (state->words[0],9);
1001
1002 write_instr_name ();
1003 WRITE_FORMAT_x_COMMA_LB (A);
1004 if (!fieldBisReg)
1005 {
1006 fieldB = state->_offset;
1007 WRITE_FORMAT_x_RB (B);
1008 }
1009 else
1010 {
1011 WRITE_FORMAT_x (B);
1012 if (fieldC != 0 && !BIT (state->words[0],13))
1013 {
1014 fieldCisReg = 0;
1015 WRITE_FORMAT_COMMA_x_RB (C);
1016 }
1017 else
1018 WRITE_FORMAT_RB ();
1019 }
1020 my_sprintf (state, state->operandBuffer, formatString, fieldA, fieldB, fieldC);
1021 write_comments ();
1022 break;
1023
1024 case 7:
1025 /* ST instruction. */
1026 CHECK_FIELD_B();
1027 CHECK_FIELD_C();
1028 fieldA = FIELDD(state->words[0]); /* shimm */
1029
1030 /* [B,A offset] */
1031 if (dbg) printf("7:b reg %d %x off %x\n",
1032 fieldBisReg,fieldB,fieldA);
1033 state->_ea_present = 1;
1034 state->_offset = fieldA;
1035 if (fieldBisReg)
1036 state->ea_reg1 = fieldB;
1037 /* field B is either a shimm (same as fieldA) or limm (different!)
1038 Say ea is not present, so only one of us will do the name lookup.
1039 (for is_limm we do the name translation here). */
1040 else
1041 state->_offset += fieldB, state->_ea_present = 0;
1042
1043 directMem = BIT(state->words[0],26);
1044 addrWriteBack = BIT(state->words[0],24);
1045
1046 write_instr_name();
1047 WRITE_FORMAT_x_COMMA_LB(C);
1048
1049 if (!fieldBisReg)
1050 {
1051 fieldB = state->_offset;
1052 WRITE_FORMAT_x_RB(B);
1053 }
1054 else
1055 {
1056 WRITE_FORMAT_x(B);
1057 if (fieldBisReg && fieldA != 0)
1058 {
1059 fieldAisReg = 0;
1060 WRITE_FORMAT_COMMA_x_RB(A);
1061 }
1062 else
1063 WRITE_FORMAT_RB();
1064 }
1065 my_sprintf (state, state->operandBuffer, formatString, fieldC, fieldB, fieldA);
1066 write_comments2(fieldA);
1067 break;
1068 case 8:
1069 /* SR instruction */
1070 CHECK_FIELD_B();
1071 CHECK_FIELD_C();
1072
1073 write_instr_name();
1074 WRITE_FORMAT_x_COMMA_LB(C);
1075 /* Try to print B as an aux reg if it is not a core reg. */
1076 usesAuxReg = 1;
1077 WRITE_FORMAT_x(B);
1078 WRITE_FORMAT_RB();
1079 my_sprintf (state, state->operandBuffer, formatString, fieldC, fieldB);
1080 write_comments();
1081 break;
1082
1083 case 9:
1084 write_instr_name();
1085 state->operandBuffer[0] = '\0';
1086 break;
1087
1088 case 10:
1089 /* LR instruction */
1090 CHECK_FIELD_A();
1091 CHECK_FIELD_B();
1092
1093 write_instr_name();
1094 WRITE_FORMAT_x_COMMA_LB(A);
1095 /* Try to print B as an aux reg if it is not a core reg. */
1096 usesAuxReg = 1;
1097 WRITE_FORMAT_x(B);
1098 WRITE_FORMAT_RB();
1099 my_sprintf (state, state->operandBuffer, formatString, fieldA, fieldB);
1100 write_comments();
1101 break;
1102
1103 case 11:
1104 CHECK_COND();
1105 write_instr_name();
1106 state->operandBuffer[0] = '\0';
1107 break;
1108
1109 default:
1110 mwerror (state, "Bad decoding class in ARC disassembler");
1111 break;
1112 }
1113
1114 state->_cond = cond;
1115 return state->instructionLen = offset;
1116}
1117
1118
1119/* Returns the name the user specified core extension register. */
1120static const char *
1121_coreRegName(arg, regval)
1122 void * arg ATTRIBUTE_UNUSED;
1123 int regval;
1124{
1125 return arcExtMap_coreRegName (regval);
1126}
1127
1128/* Returns the name the user specified AUX extension register. */
1129static const char *
1130_auxRegName(void *_this ATTRIBUTE_UNUSED, int regval)
1131{
1132 return arcExtMap_auxRegName(regval);
1133}
1134
1135
1136/* Returns the name the user specified condition code name. */
1137static const char *
1138_condCodeName(void *_this ATTRIBUTE_UNUSED, int regval)
1139{
1140 return arcExtMap_condCodeName(regval);
1141}
1142
1143/* Returns the name the user specified extension instruction. */
1144static const char *
1145_instName (void *_this ATTRIBUTE_UNUSED, int majop, int minop, int *flags)
1146{
1147 return arcExtMap_instName(majop, minop, flags);
1148}
1149
1150/* Decode an instruction returning the size of the instruction
1151 in bytes or zero if unrecognized. */
1152static int
1153decodeInstr (address, info)
1154 bfd_vma address; /* Address of this instruction. */
1155 disassemble_info * info;
1156{
1157 int status;
1158 bfd_byte buffer[4];
1159 struct arcDisState s; /* ARC Disassembler state */
1160 void *stream = info->stream; /* output stream */
1161 fprintf_ftype func = info->fprintf_func;
1162 int bytes;
1163
1164 memset (&s, 0, sizeof(struct arcDisState));
1165
1166 /* read first instruction */
1167 status = (*info->read_memory_func) (address, buffer, 4, info);
1168 if (status != 0)
1169 {
1170 (*info->memory_error_func) (status, address, info);
1171 return 0;
1172 }
1173 if (info->endian == BFD_ENDIAN_LITTLE)
1174 s.words[0] = bfd_getl32(buffer);
1175 else
1176 s.words[0] = bfd_getb32(buffer);
1177 /* always read second word in case of limm */
1178
1179 /* we ignore the result since last insn may not have a limm */
1180 status = (*info->read_memory_func) (address + 4, buffer, 4, info);
1181 if (info->endian == BFD_ENDIAN_LITTLE)
1182 s.words[1] = bfd_getl32(buffer);
1183 else
1184 s.words[1] = bfd_getb32(buffer);
1185
1186 s._this = &s;
1187 s.coreRegName = _coreRegName;
1188 s.auxRegName = _auxRegName;
1189 s.condCodeName = _condCodeName;
1190 s.instName = _instName;
1191
1192 /* disassemble */
1193 bytes = dsmOneArcInst(address, (void *)&s);
1194
1195 /* display the disassembly instruction */
1196 (*func) (stream, "%08x ", s.words[0]);
1197 (*func) (stream, " ");
1198
1199 (*func) (stream, "%-10s ", s.instrBuffer);
1200
1201 if (__TRANSLATION_REQUIRED(s))
1202 {
1203 bfd_vma addr = s.addresses[s.operandBuffer[1] - '0'];
1204 (*info->print_address_func) ((bfd_vma) addr, info);
1205 (*func) (stream, "\n");
1206 }
1207 else
1208 (*func) (stream, "%s",s.operandBuffer);
1209 return s.instructionLen;
1210}
1211
1212/* Return the print_insn function to use.
1213 Side effect: load (possibly empty) extension section */
1214
1215disassembler_ftype
1216arc_get_disassembler (void *ptr)
1217{
1218 if (ptr)
1219 build_ARC_extmap (ptr);
1220 return decodeInstr;
1221}
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