1 /* Disassemble D30V instructions.
2    Copyright (C) 1997-2016 Free Software Foundation, Inc.
3 
4    This file is part of the GNU opcodes library.
5 
6    This library 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 3, or (at your option)
9    any later version.
10 
11    It is distributed in the hope that it will be useful, but WITHOUT
12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
14    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., 51 Franklin Street - Fifth Floor, Boston,
19    MA 02110-1301, USA.  */
20 
21 #include "sysdep.h"
22 #include <stdio.h>
23 #include "opcode/d30v.h"
24 #include "dis-asm.h"
25 #include "opintl.h"
26 
27 #define PC_MASK 0xFFFFFFFF
28 
29 /* Return 0 if lookup fails,
30    1 if found and only one form,
31    2 if found and there are short and long forms.  */
32 
33 static int
lookup_opcode(struct d30v_insn * insn,long num,int is_long)34 lookup_opcode (struct d30v_insn *insn, long num, int is_long)
35 {
36   int i = 0, op_index;
37   struct d30v_format *f;
38   struct d30v_opcode *op = (struct d30v_opcode *) d30v_opcode_table;
39   int op1 = (num >> 25) & 0x7;
40   int op2 = (num >> 20) & 0x1f;
41   int mod = (num >> 18) & 0x3;
42 
43   /* Find the opcode.  */
44   do
45     {
46       if ((op->op1 == op1) && (op->op2 == op2))
47 	break;
48       op++;
49     }
50   while (op->name);
51 
52   if (!op || !op->name)
53     return 0;
54 
55   while (op->op1 == op1 && op->op2 == op2)
56     {
57       /* Scan through all the formats for the opcode.  */
58       op_index = op->format[i++];
59       do
60 	{
61 	  f = (struct d30v_format *) &d30v_format_table[op_index];
62 	  while (f->form == op_index)
63 	    {
64 	      if ((!is_long || f->form >= LONG) && (f->modifier == mod))
65 		{
66 		  insn->form = f;
67 		  break;
68 		}
69 	      f++;
70 	    }
71 	  if (insn->form)
72 	    break;
73 	}
74       while ((op_index = op->format[i++]) != 0);
75       if (insn->form)
76 	break;
77       op++;
78       i = 0;
79     }
80   if (insn->form == NULL)
81     return 0;
82 
83   insn->op = op;
84   insn->ecc = (num >> 28) & 0x7;
85   if (op->format[1])
86     return 2;
87   else
88     return 1;
89 }
90 
91 static int
extract_value(long long num,struct d30v_operand * oper,int is_long)92 extract_value (long long num, struct d30v_operand *oper, int is_long)
93 {
94   int val;
95   int shift = 12 - oper->position;
96   int mask = (0xFFFFFFFF >> (32 - oper->bits));
97 
98   if (is_long)
99     {
100       if (oper->bits == 32)
101 	/* Piece together 32-bit constant.  */
102 	val = ((num & 0x3FFFF)
103 	       | ((num & 0xFF00000) >> 2)
104 	       | ((num & 0x3F00000000LL) >> 6));
105       else
106 	val = (num >> (32 + shift)) & mask;
107     }
108   else
109     val = (num >> shift) & mask;
110 
111   if (oper->flags & OPERAND_SHIFT)
112     val <<= 3;
113 
114   return val;
115 }
116 
117 static void
print_insn(struct disassemble_info * info,bfd_vma memaddr,long long num,struct d30v_insn * insn,int is_long,int show_ext)118 print_insn (struct disassemble_info *info,
119 	    bfd_vma memaddr,
120 	    long long num,
121 	    struct d30v_insn *insn,
122 	    int is_long,
123 	    int show_ext)
124 {
125   int val, opnum, need_comma = 0;
126   struct d30v_operand *oper;
127   int i, match, opind = 0, need_paren = 0, found_control = 0;
128 
129   (*info->fprintf_func) (info->stream, "%s", insn->op->name);
130 
131   /* Check for CMP or CMPU.  */
132   if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
133     {
134       opind++;
135       val =
136 	extract_value (num,
137 		       (struct d30v_operand *) &d30v_operand_table[insn->form->operands[0]],
138 		       is_long);
139       (*info->fprintf_func) (info->stream, "%s", d30v_cc_names[val]);
140     }
141 
142   /* Add in ".s" or ".l".  */
143   if (show_ext == 2)
144     {
145       if (is_long)
146 	(*info->fprintf_func) (info->stream, ".l");
147       else
148 	(*info->fprintf_func) (info->stream, ".s");
149     }
150 
151   if (insn->ecc)
152     (*info->fprintf_func) (info->stream, "/%s", d30v_ecc_names[insn->ecc]);
153 
154   (*info->fprintf_func) (info->stream, "\t");
155 
156   while ((opnum = insn->form->operands[opind++]) != 0)
157     {
158       int bits;
159 
160       oper = (struct d30v_operand *) &d30v_operand_table[opnum];
161       bits = oper->bits;
162       if (oper->flags & OPERAND_SHIFT)
163 	bits += 3;
164 
165       if (need_comma
166 	  && oper->flags != OPERAND_PLUS
167 	  && oper->flags != OPERAND_MINUS)
168 	{
169 	  need_comma = 0;
170 	  (*info->fprintf_func) (info->stream, ", ");
171 	}
172 
173       if (oper->flags == OPERAND_ATMINUS)
174 	{
175 	  (*info->fprintf_func) (info->stream, "@-");
176 	  continue;
177 	}
178       if (oper->flags == OPERAND_MINUS)
179 	{
180 	  (*info->fprintf_func) (info->stream, "-");
181 	  continue;
182 	}
183       if (oper->flags == OPERAND_PLUS)
184 	{
185 	  (*info->fprintf_func) (info->stream, "+");
186 	  continue;
187 	}
188       if (oper->flags == OPERAND_ATSIGN)
189 	{
190 	  (*info->fprintf_func) (info->stream, "@");
191 	  continue;
192 	}
193       if (oper->flags == OPERAND_ATPAR)
194 	{
195 	  (*info->fprintf_func) (info->stream, "@(");
196 	  need_paren = 1;
197 	  continue;
198 	}
199 
200       if (oper->flags == OPERAND_SPECIAL)
201 	continue;
202 
203       val = extract_value (num, oper, is_long);
204 
205       if (oper->flags & OPERAND_REG)
206 	{
207 	  match = 0;
208 	  if (oper->flags & OPERAND_CONTROL)
209 	    {
210 	      struct d30v_operand *oper3 =
211 		(struct d30v_operand *) &d30v_operand_table[insn->form->operands[2]];
212 	      int id = extract_value (num, oper3, is_long);
213 
214 	      found_control = 1;
215 	      switch (id)
216 		{
217 		case 0:
218 		  val |= OPERAND_CONTROL;
219 		  break;
220 		case 1:
221 		case 2:
222 		  val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
223 		  break;
224 		case 3:
225 		  val |= OPERAND_FLAG;
226 		  break;
227 		default:
228 		  fprintf (stderr, "illegal id (%d)\n", id);
229 		}
230 	    }
231 	  else if (oper->flags & OPERAND_ACC)
232 	    val |= OPERAND_ACC;
233 	  else if (oper->flags & OPERAND_FLAG)
234 	    val |= OPERAND_FLAG;
235 	  for (i = 0; i < reg_name_cnt (); i++)
236 	    {
237 	      if (val == pre_defined_registers[i].value)
238 		{
239 		  if (pre_defined_registers[i].pname)
240 		    (*info->fprintf_func)
241 		      (info->stream, "%s", pre_defined_registers[i].pname);
242 		  else
243 		    (*info->fprintf_func)
244 		      (info->stream, "%s", pre_defined_registers[i].name);
245 		  match = 1;
246 		  break;
247 		}
248 	    }
249 	  if (match == 0)
250 	    {
251 	      /* This would only get executed if a register was not in
252 		 the register table.  */
253 	      (*info->fprintf_func)
254 		(info->stream, _("<unknown register %d>"), val & 0x3F);
255 	    }
256 	}
257       /* repeati has a relocation, but its first argument is a plain
258 	 immediate.  OTOH instructions like djsri have a pc-relative
259 	 delay target, but an absolute jump target.  Therefore, a test
260 	 of insn->op->reloc_flag is not specific enough; we must test
261 	 if the actual operand we are handling now is pc-relative.  */
262       else if (oper->flags & OPERAND_PCREL)
263 	{
264 	  int neg = 0;
265 
266 	  /* IMM6S3 is unsigned.  */
267 	  if (oper->flags & OPERAND_SIGNED || bits == 32)
268 	    {
269 	      long max;
270 	      max = (1 << (bits - 1));
271 	      if (val & max)
272 		{
273 		  if (bits == 32)
274 		    val = -val;
275 		  else
276 		    val = -val & ((1 << bits) - 1);
277 		  neg = 1;
278 		}
279 	    }
280 	  if (neg)
281 	    {
282 	      (*info->fprintf_func) (info->stream, "-%x\t(", val);
283 	      (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
284 	      (*info->fprintf_func) (info->stream, ")");
285 	    }
286 	  else
287 	    {
288 	      (*info->fprintf_func) (info->stream, "%x\t(", val);
289 	      (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
290 	      (*info->fprintf_func) (info->stream, ")");
291 	    }
292 	}
293       else if (insn->op->reloc_flag == RELOC_ABS)
294 	{
295 	  (*info->print_address_func) (val, info);
296 	}
297       else
298 	{
299 	  if (oper->flags & OPERAND_SIGNED)
300 	    {
301 	      int max = (1 << (bits - 1));
302 
303 	      if (val & max)
304 		{
305 		  val = -val;
306 		  if (bits < 32)
307 		    val &= ((1 << bits) - 1);
308 		  (*info->fprintf_func) (info->stream, "-");
309 		}
310 	    }
311 	  (*info->fprintf_func) (info->stream, "0x%x", val);
312 	}
313       /* If there is another operand, then write a comma and space.  */
314       if (insn->form->operands[opind] && !(found_control && opind == 2))
315 	need_comma = 1;
316     }
317   if (need_paren)
318     (*info->fprintf_func) (info->stream, ")");
319 }
320 
321 int
print_insn_d30v(bfd_vma memaddr,struct disassemble_info * info)322 print_insn_d30v (bfd_vma memaddr, struct disassemble_info *info)
323 {
324   int status, result;
325   bfd_byte buffer[12];
326   unsigned long in1, in2;
327   struct d30v_insn insn;
328   long long num;
329 
330   insn.form = NULL;
331 
332   info->bytes_per_line = 8;
333   info->bytes_per_chunk = 4;
334   info->display_endian = BFD_ENDIAN_BIG;
335 
336   status = (*info->read_memory_func) (memaddr, buffer, 4, info);
337   if (status != 0)
338     {
339       (*info->memory_error_func) (status, memaddr, info);
340       return -1;
341     }
342   in1 = bfd_getb32 (buffer);
343 
344   status = (*info->read_memory_func) (memaddr + 4, buffer, 4, info);
345   if (status != 0)
346     {
347       info->bytes_per_line = 8;
348       if (!(result = lookup_opcode (&insn, in1, 0)))
349 	(*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
350       else
351 	print_insn (info, memaddr, (long long) in1, &insn, 0, result);
352       return 4;
353     }
354   in2 = bfd_getb32 (buffer);
355 
356   if (in1 & in2 & FM01)
357     {
358       /* LONG instruction.  */
359       if (!(result = lookup_opcode (&insn, in1, 1)))
360 	{
361 	  (*info->fprintf_func) (info->stream, ".long\t0x%lx,0x%lx", in1, in2);
362 	  return 8;
363 	}
364       num = (long long) in1 << 32 | in2;
365       print_insn (info, memaddr, num, &insn, 1, result);
366     }
367   else
368     {
369       num = in1;
370       if (!(result = lookup_opcode (&insn, in1, 0)))
371 	(*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
372       else
373 	print_insn (info, memaddr, num, &insn, 0, result);
374 
375       switch (((in1 >> 31) << 1) | (in2 >> 31))
376 	{
377 	case 0:
378 	  (*info->fprintf_func) (info->stream, "\t||\t");
379 	  break;
380 	case 1:
381 	  (*info->fprintf_func) (info->stream, "\t->\t");
382 	  break;
383 	case 2:
384 	  (*info->fprintf_func) (info->stream, "\t<-\t");
385 	default:
386 	  break;
387 	}
388 
389       insn.form = NULL;
390       num = in2;
391       if (!(result = lookup_opcode (&insn, in2, 0)))
392 	(*info->fprintf_func) (info->stream, ".long\t0x%lx", in2);
393       else
394 	print_insn (info, memaddr, num, &insn, 0, result);
395     }
396   return 8;
397 }
398