1/* Print Z80 and R800 instructions
2   Copyright 2005, 2007 Free Software Foundation, Inc.
3   Contributed by Arnold Metselaar <arnold_m@operamail.com>
4
5   This file is part of the GNU opcodes library.
6
7   This library is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3, or (at your option)
10   any later version.
11
12   It is distributed in the hope that it will be useful, but WITHOUT
13   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
15   License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20   MA 02110-1301, USA.  */
21
22#include "sysdep.h"
23#include "dis-asm.h"
24#include <stdio.h>
25
26struct buffer
27{
28  bfd_vma base;
29  int n_fetch;
30  int n_used;
31  signed char data[4];
32} ;
33
34typedef int (*func)(struct buffer *, disassemble_info *, char *);
35
36struct tab_elt
37{
38  unsigned char val;
39  unsigned char mask;
40  func          fp;
41  char *        text;
42} ;
43
44#define TXTSIZ 24
45/* Names of 16-bit registers.  */
46static char * rr_str[] = { "bc", "de", "hl", "sp" };
47/* Names of 8-bit registers.  */
48static char * r_str[]  = { "b", "c", "d", "e", "h", "l", "(hl)", "a" };
49/* Texts for condition codes.  */
50static char * cc_str[] = { "nz", "z", "nc", "c", "po", "pe", "p", "m" };
51/* Instruction names for 8-bit arithmetic, operand "a" is often implicit */
52static char * arit_str[] =
53{
54  "add a,", "adc a,", "sub ", "sbc a,", "and ", "xor ", "or ", "cp "
55} ;
56
57static int
58fetch_data (struct buffer *buf, disassemble_info * info, int n)
59{
60  int r;
61
62  if (buf->n_fetch + n > 4)
63    abort ();
64
65  r = info->read_memory_func (buf->base + buf->n_fetch,
66			      (unsigned char*) buf->data + buf->n_fetch,
67			      n, info);
68  if (r == 0)
69    buf->n_fetch += n;
70  return !r;
71}
72
73static int
74prt (struct buffer *buf, disassemble_info * info, char *txt)
75{
76  info->fprintf_func (info->stream, "%s", txt);
77  buf->n_used = buf->n_fetch;
78  return 1;
79}
80
81static int
82prt_e (struct buffer *buf, disassemble_info * info, char *txt)
83{
84  char e;
85  int target_addr;
86
87  if (fetch_data (buf, info, 1))
88    {
89      e = buf->data[1];
90      target_addr = (buf->base + 2 + e) & 0xffff;
91      buf->n_used = buf->n_fetch;
92      info->fprintf_func (info->stream, "%s0x%04x", txt, target_addr);
93    }
94  else
95    buf->n_used = -1;
96
97  return buf->n_used;
98}
99
100static int
101jr_cc (struct buffer *buf, disassemble_info * info, char *txt)
102{
103  char mytxt[TXTSIZ];
104
105  snprintf (mytxt, TXTSIZ, txt, cc_str[(buf->data[0] >> 3) & 3]);
106  return prt_e (buf, info, mytxt);
107}
108
109static int
110prt_nn (struct buffer *buf, disassemble_info * info, char *txt)
111{
112  int nn;
113  unsigned char *p;
114
115  p = (unsigned char*) buf->data + buf->n_fetch;
116  if (fetch_data (buf, info, 2))
117    {
118      nn = p[0] + (p[1] << 8);
119      info->fprintf_func (info->stream, txt, nn);
120      buf->n_used = buf->n_fetch;
121    }
122  else
123    buf->n_used = -1;
124  return buf->n_used;
125}
126
127static int
128prt_rr_nn (struct buffer *buf, disassemble_info * info, char *txt)
129{
130  char mytxt[TXTSIZ];
131
132  snprintf (mytxt, TXTSIZ, txt, rr_str[(buf->data[0] >> 4) & 3]);
133  return prt_nn (buf, info, mytxt);
134}
135
136static int
137prt_rr (struct buffer *buf, disassemble_info * info, char *txt)
138{
139  info->fprintf_func (info->stream, "%s%s", txt,
140		      rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]);
141  buf->n_used = buf->n_fetch;
142  return buf->n_used;
143}
144
145static int
146prt_n (struct buffer *buf, disassemble_info * info, char *txt)
147{
148  int n;
149  unsigned char *p;
150
151  p = (unsigned char*) buf->data + buf->n_fetch;
152
153  if (fetch_data (buf, info, 1))
154    {
155      n = p[0];
156      info->fprintf_func (info->stream, txt, n);
157      buf->n_used = buf->n_fetch;
158    }
159  else
160    buf->n_used = -1;
161
162  return buf->n_used;
163}
164
165static int
166ld_r_n (struct buffer *buf, disassemble_info * info, char *txt)
167{
168  char mytxt[TXTSIZ];
169
170  snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]);
171  return prt_n (buf, info, mytxt);
172}
173
174static int
175prt_r (struct buffer *buf, disassemble_info * info, char *txt)
176{
177  info->fprintf_func (info->stream, txt,
178		      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]);
179  buf->n_used = buf->n_fetch;
180  return buf->n_used;
181}
182
183static int
184ld_r_r (struct buffer *buf, disassemble_info * info, char *txt)
185{
186  info->fprintf_func (info->stream, txt,
187		      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
188		      r_str[buf->data[buf->n_fetch - 1] & 7]);
189  buf->n_used = buf->n_fetch;
190  return buf->n_used;
191}
192
193static int
194arit_r (struct buffer *buf, disassemble_info * info, char *txt)
195{
196  info->fprintf_func (info->stream, txt,
197		      arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
198		      r_str[buf->data[buf->n_fetch - 1] & 7]);
199  buf->n_used = buf->n_fetch;
200  return buf->n_used;
201}
202
203static int
204prt_cc (struct buffer *buf, disassemble_info * info, char *txt)
205{
206  info->fprintf_func (info->stream, "%s%s", txt,
207		      cc_str[(buf->data[0] >> 3) & 7]);
208  buf->n_used = buf->n_fetch;
209  return buf->n_used;
210}
211
212static int
213pop_rr (struct buffer *buf, disassemble_info * info, char *txt)
214{
215  static char *rr_stack[] = { "bc","de","hl","af"};
216
217  info->fprintf_func (info->stream, "%s %s", txt,
218		      rr_stack[(buf->data[0] >> 4) & 3]);
219  buf->n_used = buf->n_fetch;
220  return buf->n_used;
221}
222
223
224static int
225jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt)
226{
227  char mytxt[TXTSIZ];
228
229  snprintf (mytxt,TXTSIZ,
230	    "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]);
231  return prt_nn (buf, info, mytxt);
232}
233
234static int
235arit_n (struct buffer *buf, disassemble_info * info, char *txt)
236{
237  char mytxt[TXTSIZ];
238
239  snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]);
240  return prt_n (buf, info, mytxt);
241}
242
243static int
244rst (struct buffer *buf, disassemble_info * info, char *txt)
245{
246  info->fprintf_func (info->stream, txt, buf->data[0] & 0x38);
247  buf->n_used = buf->n_fetch;
248  return buf->n_used;
249}
250
251
252static int
253cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED)
254{
255  static char * opar[] = { "ld", "cp", "in", "out" };
256  char * op;
257  char c;
258
259  c = buf->data[1];
260  op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]);
261  info->fprintf_func (info->stream,
262		      "%s%c%s", op,
263		      (c & 0x08) ? 'd' : 'i',
264		      (c & 0x10) ? "r" : "");
265  buf->n_used = 2;
266  return buf->n_used;
267}
268
269static int
270dump (struct buffer *buf, disassemble_info * info, char *txt)
271{
272  int i;
273
274  info->fprintf_func (info->stream, "defb ");
275  for (i = 0; txt[i]; ++i)
276    info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x",
277			(unsigned char) buf->data[i]);
278  buf->n_used = i;
279  return buf->n_used;
280}
281
282/* Table to disassemble machine codes with prefix 0xED.  */
283struct tab_elt opc_ed[] =
284{
285  { 0x70, 0xFF, prt, "in f,(c)" },
286  { 0x70, 0xFF, dump, "xx" },
287  { 0x40, 0xC7, prt_r, "in %s,(c)" },
288  { 0x71, 0xFF, prt, "out (c),0" },
289  { 0x70, 0xFF, dump, "xx" },
290  { 0x41, 0xC7, prt_r, "out (c),%s" },
291  { 0x42, 0xCF, prt_rr, "sbc hl," },
292  { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" },
293  { 0x44, 0xFF, prt, "neg" },
294  { 0x45, 0xFF, prt, "retn" },
295  { 0x46, 0xFF, prt, "im 0" },
296  { 0x47, 0xFF, prt, "ld i,a" },
297  { 0x4A, 0xCF, prt_rr, "adc hl," },
298  { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" },
299  { 0x4D, 0xFF, prt, "reti" },
300  { 0x56, 0xFF, prt, "im 1" },
301  { 0x57, 0xFF, prt, "ld a,i" },
302  { 0x5E, 0xFF, prt, "im 2" },
303  { 0x67, 0xFF, prt, "rrd" },
304  { 0x6F, 0xFF, prt, "rld" },
305  { 0xA0, 0xE4, cis, "" },
306  { 0xC3, 0xFF, prt, "muluw hl,bc" },
307  { 0xC5, 0xE7, prt_r, "mulub a,%s" },
308  { 0xF3, 0xFF, prt, "muluw hl,sp" },
309  { 0x00, 0x00, dump, "xx" }
310};
311
312static int
313pref_ed (struct buffer * buf, disassemble_info * info,
314	 char* txt ATTRIBUTE_UNUSED)
315{
316  struct tab_elt *p;
317
318  if (fetch_data(buf, info, 1))
319    {
320      for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p)
321	;
322      p->fp (buf, info, p->text);
323    }
324  else
325    buf->n_used = -1;
326
327  return buf->n_used;
328}
329
330/* Instruction names for the instructions addressing single bits.  */
331static char *cb1_str[] = { "", "bit", "res", "set"};
332/* Instruction names for shifts and rotates.  */
333static char *cb2_str[] =
334{
335  "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl"
336};
337
338static int
339pref_cb (struct buffer * buf, disassemble_info * info,
340	 char* txt ATTRIBUTE_UNUSED)
341{
342  if (fetch_data (buf, info, 1))
343    {
344      buf->n_used = 2;
345      if ((buf->data[1] & 0xc0) == 0)
346	info->fprintf_func (info->stream, "%s %s",
347			    cb2_str[(buf->data[1] >> 3) & 7],
348			    r_str[buf->data[1] & 7]);
349      else
350	info->fprintf_func (info->stream, "%s %d,%s",
351			    cb1_str[(buf->data[1] >> 6) & 3],
352			    (buf->data[1] >> 3) & 7,
353			    r_str[buf->data[1] & 7]);
354    }
355  else
356    buf->n_used = -1;
357
358  return buf->n_used;
359}
360
361static int
362addvv (struct buffer * buf, disassemble_info * info, char* txt)
363{
364  info->fprintf_func (info->stream, "add %s,%s", txt, txt);
365
366  return buf->n_used = buf->n_fetch;
367}
368
369static int
370ld_v_v (struct buffer * buf, disassemble_info * info, char* txt)
371{
372  char mytxt[TXTSIZ];
373
374  snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt);
375  return ld_r_r (buf, info, mytxt);
376}
377
378static int
379prt_d (struct buffer *buf, disassemble_info * info, char *txt)
380{
381  int d;
382  signed char *p;
383
384  p = buf->data + buf->n_fetch;
385
386  if (fetch_data (buf, info, 1))
387    {
388      d = p[0];
389      info->fprintf_func (info->stream, txt, d);
390      buf->n_used = buf->n_fetch;
391    }
392  else
393    buf->n_used = -1;
394
395  return buf->n_used;
396}
397
398static int
399prt_d_n (struct buffer *buf, disassemble_info * info, char *txt)
400{
401  char mytxt[TXTSIZ];
402  int d;
403  signed char *p;
404
405  p = buf->data + buf->n_fetch;
406
407  if (fetch_data (buf, info, 1))
408    {
409      d = p[0];
410      snprintf (mytxt, TXTSIZ, txt, d);
411      return prt_n (buf, info, mytxt);
412    }
413  else
414    buf->n_used = -1;
415
416  return buf->n_used;
417}
418
419static int
420arit_d (struct buffer *buf, disassemble_info * info, char *txt)
421{
422  char mytxt[TXTSIZ];
423  signed char c;
424
425  c = buf->data[buf->n_fetch - 1];
426  snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]);
427  return prt_d (buf, info, mytxt);
428}
429
430static int
431ld_r_d (struct buffer *buf, disassemble_info * info, char *txt)
432{
433  char mytxt[TXTSIZ];
434  signed char c;
435
436  c = buf->data[buf->n_fetch - 1];
437  snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]);
438  return prt_d (buf, info, mytxt);
439}
440
441static int
442ld_d_r(struct buffer *buf, disassemble_info * info, char *txt)
443{
444  char mytxt[TXTSIZ];
445  signed char c;
446
447  c = buf->data[buf->n_fetch - 1];
448  snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]);
449  return prt_d (buf, info, mytxt);
450}
451
452static int
453pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt)
454{
455  if (fetch_data (buf, info, 2))
456    {
457      int d;
458      char arg[TXTSIZ];
459      signed char *p;
460
461      buf->n_used = 4;
462      p = buf->data;
463      d = p[2];
464
465      if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06))
466	snprintf (arg, TXTSIZ, "(%s%+d)", txt, d);
467      else
468	snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]);
469
470      if ((p[3] & 0xc0) == 0)
471	info->fprintf_func (info->stream, "%s %s",
472			    cb2_str[(buf->data[3] >> 3) & 7],
473			    arg);
474      else
475	info->fprintf_func (info->stream, "%s %d,%s",
476			    cb1_str[(buf->data[3] >> 6) & 3],
477			    (buf->data[3] >> 3) & 7,
478			    arg);
479    }
480  else
481    buf->n_used = -1;
482
483  return buf->n_used;
484}
485
486/* Table to disassemble machine codes with prefix 0xDD or 0xFD.  */
487static struct tab_elt opc_ind[] =
488{
489  { 0x24, 0xF7, prt_r, "inc %s%%s" },
490  { 0x25, 0xF7, prt_r, "dec %s%%s" },
491  { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" },
492  { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" },
493  { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" },
494  { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" },
495  { 0x23, 0xFF, prt, "inc %s" },
496  { 0x2B, 0xFF, prt, "dec %s" },
497  { 0x29, 0xFF, addvv, "%s" },
498  { 0x09, 0xCF, prt_rr, "add %s," },
499  { 0x34, 0xFF, prt_d, "inc (%s%%+d)" },
500  { 0x35, 0xFF, prt_d, "dec (%s%%+d)" },
501  { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" },
502
503  { 0x76, 0xFF, dump, "h" },
504  { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" },
505  { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" },
506  { 0x64, 0xF6, ld_v_v, "%s" },
507  { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" },
508  { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" },
509
510  { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" },
511  { 0x84, 0xC6, arit_r, "%%s%s%%s" },
512
513  { 0xE1, 0xFF, prt, "pop %s" },
514  { 0xE5, 0xFF, prt, "push %s" },
515  { 0xCB, 0xFF, pref_xd_cb, "%s" },
516  { 0xE3, 0xFF, prt, "ex (sp),%s" },
517  { 0xE9, 0xFF, prt, "jp (%s)" },
518  { 0xF9, 0xFF, prt, "ld sp,%s" },
519  { 0x00, 0x00, dump, "?" },
520} ;
521
522static int
523pref_ind (struct buffer * buf, disassemble_info * info, char* txt)
524{
525  if (fetch_data (buf, info, 1))
526    {
527      char mytxt[TXTSIZ];
528      struct tab_elt *p;
529
530      for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p)
531	;
532      snprintf (mytxt, TXTSIZ, p->text, txt);
533      p->fp (buf, info, mytxt);
534    }
535  else
536    buf->n_used = -1;
537
538  return buf->n_used;
539}
540
541/* Table to disassemble machine codes without prefix.  */
542static struct tab_elt opc_main[] =
543{
544  { 0x00, 0xFF, prt, "nop" },
545  { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" },
546  { 0x02, 0xFF, prt, "ld (bc),a" },
547  { 0x03, 0xCF, prt_rr, "inc " },
548  { 0x04, 0xC7, prt_r, "inc %s" },
549  { 0x05, 0xC7, prt_r, "dec %s" },
550  { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" },
551  { 0x07, 0xFF, prt, "rlca" },
552  { 0x08, 0xFF, prt, "ex af,af'" },
553  { 0x09, 0xCF, prt_rr, "add hl," },
554  { 0x0A, 0xFF, prt, "ld a,(bc)" },
555  { 0x0B, 0xCF, prt_rr, "dec " },
556  { 0x0F, 0xFF, prt, "rrca" },
557  { 0x10, 0xFF, prt_e, "djnz " },
558  { 0x12, 0xFF, prt, "ld (de),a" },
559  { 0x17, 0xFF, prt, "rla" },
560  { 0x18, 0xFF, prt_e, "jr "},
561  { 0x1A, 0xFF, prt, "ld a,(de)" },
562  { 0x1F, 0xFF, prt, "rra" },
563  { 0x20, 0xE7, jr_cc, "jr %s,"},
564  { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" },
565  { 0x27, 0xFF, prt, "daa"},
566  { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" },
567  { 0x2F, 0xFF, prt, "cpl" },
568  { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" },
569  { 0x37, 0xFF, prt, "scf" },
570  { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" },
571  { 0x3F, 0xFF, prt, "ccf" },
572
573  { 0x76, 0xFF, prt, "halt" },
574  { 0x40, 0xC0, ld_r_r, "ld %s,%s"},
575
576  { 0x80, 0xC0, arit_r, "%s%s" },
577
578  { 0xC0, 0xC7, prt_cc, "ret " },
579  { 0xC1, 0xCF, pop_rr, "pop" },
580  { 0xC2, 0xC7, jp_cc_nn, "jp " },
581  { 0xC3, 0xFF, prt_nn, "jp 0x%04x" },
582  { 0xC4, 0xC7, jp_cc_nn, "call " },
583  { 0xC5, 0xCF, pop_rr, "push" },
584  { 0xC6, 0xC7, arit_n, "%s0x%%02x" },
585  { 0xC7, 0xC7, rst, "rst 0x%02x" },
586  { 0xC9, 0xFF, prt, "ret" },
587  { 0xCB, 0xFF, pref_cb, "" },
588  { 0xCD, 0xFF, prt_nn, "call 0x%04x" },
589  { 0xD3, 0xFF, prt_n, "out (0x%02x),a" },
590  { 0xD9, 0xFF, prt, "exx" },
591  { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" },
592  { 0xDD, 0xFF, pref_ind, "ix" },
593  { 0xE3, 0xFF, prt, "ex (sp),hl" },
594  { 0xE9, 0xFF, prt, "jp (hl)" },
595  { 0xEB, 0xFF, prt, "ex de,hl" },
596  { 0xED, 0xFF, pref_ed, ""},
597  { 0xF3, 0xFF, prt, "di" },
598  { 0xF9, 0xFF, prt, "ld sp,hl" },
599  { 0xFB, 0xFF, prt, "ei" },
600  { 0xFD, 0xFF, pref_ind, "iy" },
601  { 0x00, 0x00, prt, "????" },
602} ;
603
604int
605print_insn_z80 (bfd_vma addr, disassemble_info * info)
606{
607  struct buffer buf;
608  struct tab_elt *p;
609
610  buf.base = addr;
611  buf.n_fetch = 0;
612  buf.n_used = 0;
613
614  if (! fetch_data (& buf, info, 1))
615    return -1;
616
617  for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p)
618    ;
619  p->fp (& buf, info, p->text);
620
621  return buf.n_used;
622}
623