1/* Print Z80 and R800 instructions
2   Copyright (C) 2005-2017 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  int rr;
132
133  rr = (buf->data[buf->n_fetch - 1] >> 4) & 3;
134  snprintf (mytxt, TXTSIZ, txt, rr_str[rr]);
135  return prt_nn (buf, info, mytxt);
136}
137
138static int
139prt_rr (struct buffer *buf, disassemble_info * info, char *txt)
140{
141  info->fprintf_func (info->stream, "%s%s", txt,
142		      rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]);
143  buf->n_used = buf->n_fetch;
144  return buf->n_used;
145}
146
147static int
148prt_n (struct buffer *buf, disassemble_info * info, char *txt)
149{
150  int n;
151  unsigned char *p;
152
153  p = (unsigned char*) buf->data + buf->n_fetch;
154
155  if (fetch_data (buf, info, 1))
156    {
157      n = p[0];
158      info->fprintf_func (info->stream, txt, n);
159      buf->n_used = buf->n_fetch;
160    }
161  else
162    buf->n_used = -1;
163
164  return buf->n_used;
165}
166
167static int
168ld_r_n (struct buffer *buf, disassemble_info * info, char *txt)
169{
170  char mytxt[TXTSIZ];
171
172  snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]);
173  return prt_n (buf, info, mytxt);
174}
175
176static int
177prt_r (struct buffer *buf, disassemble_info * info, char *txt)
178{
179  info->fprintf_func (info->stream, txt,
180		      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]);
181  buf->n_used = buf->n_fetch;
182  return buf->n_used;
183}
184
185static int
186ld_r_r (struct buffer *buf, disassemble_info * info, char *txt)
187{
188  info->fprintf_func (info->stream, txt,
189		      r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
190		      r_str[buf->data[buf->n_fetch - 1] & 7]);
191  buf->n_used = buf->n_fetch;
192  return buf->n_used;
193}
194
195static int
196arit_r (struct buffer *buf, disassemble_info * info, char *txt)
197{
198  info->fprintf_func (info->stream, txt,
199		      arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7],
200		      r_str[buf->data[buf->n_fetch - 1] & 7]);
201  buf->n_used = buf->n_fetch;
202  return buf->n_used;
203}
204
205static int
206prt_cc (struct buffer *buf, disassemble_info * info, char *txt)
207{
208  info->fprintf_func (info->stream, "%s%s", txt,
209		      cc_str[(buf->data[0] >> 3) & 7]);
210  buf->n_used = buf->n_fetch;
211  return buf->n_used;
212}
213
214static int
215pop_rr (struct buffer *buf, disassemble_info * info, char *txt)
216{
217  static char *rr_stack[] = { "bc","de","hl","af"};
218
219  info->fprintf_func (info->stream, "%s %s", txt,
220		      rr_stack[(buf->data[0] >> 4) & 3]);
221  buf->n_used = buf->n_fetch;
222  return buf->n_used;
223}
224
225
226static int
227jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt)
228{
229  char mytxt[TXTSIZ];
230
231  snprintf (mytxt,TXTSIZ,
232	    "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]);
233  return prt_nn (buf, info, mytxt);
234}
235
236static int
237arit_n (struct buffer *buf, disassemble_info * info, char *txt)
238{
239  char mytxt[TXTSIZ];
240
241  snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]);
242  return prt_n (buf, info, mytxt);
243}
244
245static int
246rst (struct buffer *buf, disassemble_info * info, char *txt)
247{
248  info->fprintf_func (info->stream, txt, buf->data[0] & 0x38);
249  buf->n_used = buf->n_fetch;
250  return buf->n_used;
251}
252
253
254static int
255cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED)
256{
257  static char * opar[] = { "ld", "cp", "in", "out" };
258  char * op;
259  char c;
260
261  c = buf->data[1];
262  op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]);
263  info->fprintf_func (info->stream,
264		      "%s%c%s", op,
265		      (c & 0x08) ? 'd' : 'i',
266		      (c & 0x10) ? "r" : "");
267  buf->n_used = 2;
268  return buf->n_used;
269}
270
271static int
272dump (struct buffer *buf, disassemble_info * info, char *txt)
273{
274  int i;
275
276  info->fprintf_func (info->stream, "defb ");
277  for (i = 0; txt[i]; ++i)
278    info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x",
279			(unsigned char) buf->data[i]);
280  buf->n_used = i;
281  return buf->n_used;
282}
283
284/* Table to disassemble machine codes with prefix 0xED.  */
285struct tab_elt opc_ed[] =
286{
287  { 0x70, 0xFF, prt, "in f,(c)" },
288  { 0x70, 0xFF, dump, "xx" },
289  { 0x40, 0xC7, prt_r, "in %s,(c)" },
290  { 0x71, 0xFF, prt, "out (c),0" },
291  { 0x70, 0xFF, dump, "xx" },
292  { 0x41, 0xC7, prt_r, "out (c),%s" },
293  { 0x42, 0xCF, prt_rr, "sbc hl," },
294  { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" },
295  { 0x44, 0xFF, prt, "neg" },
296  { 0x45, 0xFF, prt, "retn" },
297  { 0x46, 0xFF, prt, "im 0" },
298  { 0x47, 0xFF, prt, "ld i,a" },
299  { 0x4A, 0xCF, prt_rr, "adc hl," },
300  { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" },
301  { 0x4D, 0xFF, prt, "reti" },
302  { 0x4F, 0xFF, prt, "ld r,a" },
303  { 0x56, 0xFF, prt, "im 1" },
304  { 0x57, 0xFF, prt, "ld a,i" },
305  { 0x5E, 0xFF, prt, "im 2" },
306  { 0x5F, 0xFF, prt, "ld a,r" },
307  { 0x67, 0xFF, prt, "rrd" },
308  { 0x6F, 0xFF, prt, "rld" },
309  { 0xA0, 0xE4, cis, "" },
310  { 0xC3, 0xFF, prt, "muluw hl,bc" },
311  { 0xC5, 0xE7, prt_r, "mulub a,%s" },
312  { 0xF3, 0xFF, prt, "muluw hl,sp" },
313  { 0x00, 0x00, dump, "xx" }
314};
315
316static int
317pref_ed (struct buffer * buf, disassemble_info * info,
318	 char* txt ATTRIBUTE_UNUSED)
319{
320  struct tab_elt *p;
321
322  if (fetch_data(buf, info, 1))
323    {
324      for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p)
325	;
326      p->fp (buf, info, p->text);
327    }
328  else
329    buf->n_used = -1;
330
331  return buf->n_used;
332}
333
334/* Instruction names for the instructions addressing single bits.  */
335static char *cb1_str[] = { "", "bit", "res", "set"};
336/* Instruction names for shifts and rotates.  */
337static char *cb2_str[] =
338{
339  "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl"
340};
341
342static int
343pref_cb (struct buffer * buf, disassemble_info * info,
344	 char* txt ATTRIBUTE_UNUSED)
345{
346  if (fetch_data (buf, info, 1))
347    {
348      buf->n_used = 2;
349      if ((buf->data[1] & 0xc0) == 0)
350	info->fprintf_func (info->stream, "%s %s",
351			    cb2_str[(buf->data[1] >> 3) & 7],
352			    r_str[buf->data[1] & 7]);
353      else
354	info->fprintf_func (info->stream, "%s %d,%s",
355			    cb1_str[(buf->data[1] >> 6) & 3],
356			    (buf->data[1] >> 3) & 7,
357			    r_str[buf->data[1] & 7]);
358    }
359  else
360    buf->n_used = -1;
361
362  return buf->n_used;
363}
364
365static int
366addvv (struct buffer * buf, disassemble_info * info, char* txt)
367{
368  info->fprintf_func (info->stream, "add %s,%s", txt, txt);
369
370  return buf->n_used = buf->n_fetch;
371}
372
373static int
374ld_v_v (struct buffer * buf, disassemble_info * info, char* txt)
375{
376  char mytxt[TXTSIZ];
377
378  snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt);
379  return ld_r_r (buf, info, mytxt);
380}
381
382static int
383prt_d (struct buffer *buf, disassemble_info * info, char *txt)
384{
385  int d;
386  signed char *p;
387
388  p = buf->data + buf->n_fetch;
389
390  if (fetch_data (buf, info, 1))
391    {
392      d = p[0];
393      info->fprintf_func (info->stream, txt, d);
394      buf->n_used = buf->n_fetch;
395    }
396  else
397    buf->n_used = -1;
398
399  return buf->n_used;
400}
401
402static int
403prt_d_n (struct buffer *buf, disassemble_info * info, char *txt)
404{
405  char mytxt[TXTSIZ];
406  int d;
407  signed char *p;
408
409  p = buf->data + buf->n_fetch;
410
411  if (fetch_data (buf, info, 1))
412    {
413      d = p[0];
414      snprintf (mytxt, TXTSIZ, txt, d);
415      return prt_n (buf, info, mytxt);
416    }
417  else
418    buf->n_used = -1;
419
420  return buf->n_used;
421}
422
423static int
424arit_d (struct buffer *buf, disassemble_info * info, char *txt)
425{
426  char mytxt[TXTSIZ];
427  signed char c;
428
429  c = buf->data[buf->n_fetch - 1];
430  snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]);
431  return prt_d (buf, info, mytxt);
432}
433
434static int
435ld_r_d (struct buffer *buf, disassemble_info * info, char *txt)
436{
437  char mytxt[TXTSIZ];
438  signed char c;
439
440  c = buf->data[buf->n_fetch - 1];
441  snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]);
442  return prt_d (buf, info, mytxt);
443}
444
445static int
446ld_d_r(struct buffer *buf, disassemble_info * info, char *txt)
447{
448  char mytxt[TXTSIZ];
449  signed char c;
450
451  c = buf->data[buf->n_fetch - 1];
452  snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]);
453  return prt_d (buf, info, mytxt);
454}
455
456static int
457pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt)
458{
459  if (fetch_data (buf, info, 2))
460    {
461      int d;
462      char arg[TXTSIZ];
463      signed char *p;
464
465      buf->n_used = 4;
466      p = buf->data;
467      d = p[2];
468
469      if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06))
470	snprintf (arg, TXTSIZ, "(%s%+d)", txt, d);
471      else
472	snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]);
473
474      if ((p[3] & 0xc0) == 0)
475	info->fprintf_func (info->stream, "%s %s",
476			    cb2_str[(buf->data[3] >> 3) & 7],
477			    arg);
478      else
479	info->fprintf_func (info->stream, "%s %d,%s",
480			    cb1_str[(buf->data[3] >> 6) & 3],
481			    (buf->data[3] >> 3) & 7,
482			    arg);
483    }
484  else
485    buf->n_used = -1;
486
487  return buf->n_used;
488}
489
490/* Table to disassemble machine codes with prefix 0xDD or 0xFD.  */
491static struct tab_elt opc_ind[] =
492{
493  { 0x24, 0xF7, prt_r, "inc %s%%s" },
494  { 0x25, 0xF7, prt_r, "dec %s%%s" },
495  { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" },
496  { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" },
497  { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" },
498  { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" },
499  { 0x23, 0xFF, prt, "inc %s" },
500  { 0x2B, 0xFF, prt, "dec %s" },
501  { 0x29, 0xFF, addvv, "%s" },
502  { 0x09, 0xCF, prt_rr, "add %s," },
503  { 0x34, 0xFF, prt_d, "inc (%s%%+d)" },
504  { 0x35, 0xFF, prt_d, "dec (%s%%+d)" },
505  { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" },
506
507  { 0x76, 0xFF, dump, "h" },
508  { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" },
509  { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" },
510  { 0x64, 0xF6, ld_v_v, "%s" },
511  { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" },
512  { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" },
513
514  { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" },
515  { 0x84, 0xC6, arit_r, "%%s%s%%s" },
516
517  { 0xE1, 0xFF, prt, "pop %s" },
518  { 0xE5, 0xFF, prt, "push %s" },
519  { 0xCB, 0xFF, pref_xd_cb, "%s" },
520  { 0xE3, 0xFF, prt, "ex (sp),%s" },
521  { 0xE9, 0xFF, prt, "jp (%s)" },
522  { 0xF9, 0xFF, prt, "ld sp,%s" },
523  { 0x00, 0x00, dump, "?" },
524} ;
525
526static int
527pref_ind (struct buffer * buf, disassemble_info * info, char* txt)
528{
529  if (fetch_data (buf, info, 1))
530    {
531      char mytxt[TXTSIZ];
532      struct tab_elt *p;
533
534      for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p)
535	;
536      snprintf (mytxt, TXTSIZ, p->text, txt);
537      p->fp (buf, info, mytxt);
538    }
539  else
540    buf->n_used = -1;
541
542  return buf->n_used;
543}
544
545/* Table to disassemble machine codes without prefix.  */
546static struct tab_elt opc_main[] =
547{
548  { 0x00, 0xFF, prt, "nop" },
549  { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" },
550  { 0x02, 0xFF, prt, "ld (bc),a" },
551  { 0x03, 0xCF, prt_rr, "inc " },
552  { 0x04, 0xC7, prt_r, "inc %s" },
553  { 0x05, 0xC7, prt_r, "dec %s" },
554  { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" },
555  { 0x07, 0xFF, prt, "rlca" },
556  { 0x08, 0xFF, prt, "ex af,af'" },
557  { 0x09, 0xCF, prt_rr, "add hl," },
558  { 0x0A, 0xFF, prt, "ld a,(bc)" },
559  { 0x0B, 0xCF, prt_rr, "dec " },
560  { 0x0F, 0xFF, prt, "rrca" },
561  { 0x10, 0xFF, prt_e, "djnz " },
562  { 0x12, 0xFF, prt, "ld (de),a" },
563  { 0x17, 0xFF, prt, "rla" },
564  { 0x18, 0xFF, prt_e, "jr "},
565  { 0x1A, 0xFF, prt, "ld a,(de)" },
566  { 0x1F, 0xFF, prt, "rra" },
567  { 0x20, 0xE7, jr_cc, "jr %s,"},
568  { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" },
569  { 0x27, 0xFF, prt, "daa"},
570  { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" },
571  { 0x2F, 0xFF, prt, "cpl" },
572  { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" },
573  { 0x37, 0xFF, prt, "scf" },
574  { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" },
575  { 0x3F, 0xFF, prt, "ccf" },
576
577  { 0x76, 0xFF, prt, "halt" },
578  { 0x40, 0xC0, ld_r_r, "ld %s,%s"},
579
580  { 0x80, 0xC0, arit_r, "%s%s" },
581
582  { 0xC0, 0xC7, prt_cc, "ret " },
583  { 0xC1, 0xCF, pop_rr, "pop" },
584  { 0xC2, 0xC7, jp_cc_nn, "jp " },
585  { 0xC3, 0xFF, prt_nn, "jp 0x%04x" },
586  { 0xC4, 0xC7, jp_cc_nn, "call " },
587  { 0xC5, 0xCF, pop_rr, "push" },
588  { 0xC6, 0xC7, arit_n, "%s0x%%02x" },
589  { 0xC7, 0xC7, rst, "rst 0x%02x" },
590  { 0xC9, 0xFF, prt, "ret" },
591  { 0xCB, 0xFF, pref_cb, "" },
592  { 0xCD, 0xFF, prt_nn, "call 0x%04x" },
593  { 0xD3, 0xFF, prt_n, "out (0x%02x),a" },
594  { 0xD9, 0xFF, prt, "exx" },
595  { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" },
596  { 0xDD, 0xFF, pref_ind, "ix" },
597  { 0xE3, 0xFF, prt, "ex (sp),hl" },
598  { 0xE9, 0xFF, prt, "jp (hl)" },
599  { 0xEB, 0xFF, prt, "ex de,hl" },
600  { 0xED, 0xFF, pref_ed, ""},
601  { 0xF3, 0xFF, prt, "di" },
602  { 0xF9, 0xFF, prt, "ld sp,hl" },
603  { 0xFB, 0xFF, prt, "ei" },
604  { 0xFD, 0xFF, pref_ind, "iy" },
605  { 0x00, 0x00, prt, "????" },
606} ;
607
608int
609print_insn_z80 (bfd_vma addr, disassemble_info * info)
610{
611  struct buffer buf;
612  struct tab_elt *p;
613
614  buf.base = addr;
615  buf.n_fetch = 0;
616  buf.n_used = 0;
617
618  if (! fetch_data (& buf, info, 1))
619    return -1;
620
621  for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p)
622    ;
623  p->fp (& buf, info, p->text);
624
625  return buf.n_used;
626}
627