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PR24435, buffer overflow reading dynamic entries
[thirdparty/binutils-gdb.git] / opcodes / d30v-dis.c
CommitLineData
252b5132 1/* Disassemble D30V instructions.
82704155 2 Copyright (C) 1997-2019 Free Software Foundation, Inc.
252b5132 3
9b201bb5
NC
4 This file is part of the GNU opcodes library.
5
6 This library is free software; you can redistribute it and/or modify
47b0e7ad 7 it under the terms of the GNU General Public License as published by
9b201bb5
NC
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
252b5132 10
9b201bb5
NC
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.
252b5132 15
47b0e7ad
NC
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. */
252b5132 20
0d8dfecf 21#include "sysdep.h"
df7b86aa 22#include <stdio.h>
2dcee538 23#include "opcode/d30v.h"
88c1242d 24#include "disassemble.h"
252b5132
RH
25#include "opintl.h"
26
27#define PC_MASK 0xFFFFFFFF
28
2dcee538
KH
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. */
252b5132 32
252b5132 33static int
47b0e7ad 34lookup_opcode (struct d30v_insn *insn, long num, int is_long)
252b5132 35{
91d6fa6a 36 int i = 0, op_index;
252b5132 37 struct d30v_format *f;
2dcee538 38 struct d30v_opcode *op = (struct d30v_opcode *) d30v_opcode_table;
252b5132
RH
39 int op1 = (num >> 25) & 0x7;
40 int op2 = (num >> 20) & 0x1f;
41 int mod = (num >> 18) & 0x3;
42
2dcee538
KH
43 /* Find the opcode. */
44 do
45 {
46 if ((op->op1 == op1) && (op->op2 == op2))
47 break;
48 op++;
49 }
50 while (op->name);
252b5132
RH
51
52 if (!op || !op->name)
53 return 0;
54
55 while (op->op1 == op1 && op->op2 == op2)
56 {
2dcee538 57 /* Scan through all the formats for the opcode. */
91d6fa6a 58 op_index = op->format[i++];
2dcee538 59 do
252b5132 60 {
91d6fa6a
NC
61 f = (struct d30v_format *) &d30v_format_table[op_index];
62 while (f->form == op_index)
252b5132
RH
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;
2dcee538 73 }
91d6fa6a 74 while ((op_index = op->format[i++]) != 0);
252b5132
RH
75 if (insn->form)
76 break;
77 op++;
2dcee538 78 i = 0;
252b5132
RH
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
47b0e7ad
NC
91static int
92extract_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
2dcee538 117static void
47b0e7ad
NC
118print_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)
252b5132 124{
2dcee538 125 int val, opnum, need_comma = 0;
252b5132 126 struct d30v_operand *oper;
2dcee538 127 int i, match, opind = 0, need_paren = 0, found_control = 0;
252b5132 128
2dcee538 129 (*info->fprintf_func) (info->stream, "%s", insn->op->name);
252b5132 130
2dcee538 131 /* Check for CMP or CMPU. */
252b5132
RH
132 if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
133 {
134 opind++;
2dcee538
KH
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]);
252b5132
RH
140 }
141
2dcee538 142 /* Add in ".s" or ".l". */
252b5132
RH
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)
2dcee538 152 (*info->fprintf_func) (info->stream, "/%s", d30v_ecc_names[insn->ecc]);
252b5132
RH
153
154 (*info->fprintf_func) (info->stream, "\t");
155
156 while ((opnum = insn->form->operands[opind++]) != 0)
157 {
158 int bits;
47b0e7ad 159
2dcee538 160 oper = (struct d30v_operand *) &d30v_operand_table[opnum];
252b5132
RH
161 bits = oper->bits;
162 if (oper->flags & OPERAND_SHIFT)
163 bits += 3;
164
2dcee538
KH
165 if (need_comma
166 && oper->flags != OPERAND_PLUS
167 && oper->flags != OPERAND_MINUS)
252b5132 168 {
2dcee538 169 need_comma = 0;
252b5132
RH
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 {
2dcee538 180 (*info->fprintf_func) (info->stream, "-");
252b5132
RH
181 continue;
182 }
183 if (oper->flags == OPERAND_PLUS)
184 {
2dcee538 185 (*info->fprintf_func) (info->stream, "+");
252b5132
RH
186 continue;
187 }
188 if (oper->flags == OPERAND_ATSIGN)
189 {
2dcee538 190 (*info->fprintf_func) (info->stream, "@");
252b5132
RH
191 continue;
192 }
193 if (oper->flags == OPERAND_ATPAR)
194 {
2dcee538 195 (*info->fprintf_func) (info->stream, "@(");
252b5132
RH
196 need_paren = 1;
197 continue;
198 }
199
200 if (oper->flags == OPERAND_SPECIAL)
201 continue;
202
2dcee538
KH
203 val = extract_value (num, oper, is_long);
204
252b5132
RH
205 if (oper->flags & OPERAND_REG)
206 {
207 match = 0;
208 if (oper->flags & OPERAND_CONTROL)
209 {
2dcee538
KH
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);
47b0e7ad 213
252b5132 214 found_control = 1;
2dcee538 215 switch (id)
252b5132
RH
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:
a6743a54
AM
228 /* xgettext: c-format */
229 opcodes_error_handler (_("illegal id (%d)"), id);
230 abort ();
252b5132
RH
231 }
232 }
233 else if (oper->flags & OPERAND_ACC)
234 val |= OPERAND_ACC;
235 else if (oper->flags & OPERAND_FLAG)
236 val |= OPERAND_FLAG;
2dcee538 237 for (i = 0; i < reg_name_cnt (); i++)
252b5132
RH
238 {
239 if (val == pre_defined_registers[i].value)
240 {
241 if (pre_defined_registers[i].pname)
242 (*info->fprintf_func)
2dcee538 243 (info->stream, "%s", pre_defined_registers[i].pname);
252b5132
RH
244 else
245 (*info->fprintf_func)
2dcee538
KH
246 (info->stream, "%s", pre_defined_registers[i].name);
247 match = 1;
252b5132
RH
248 break;
249 }
250 }
2dcee538 251 if (match == 0)
252b5132 252 {
2dcee538
KH
253 /* This would only get executed if a register was not in
254 the register table. */
252b5132 255 (*info->fprintf_func)
2dcee538 256 (info->stream, _("<unknown register %d>"), val & 0x3F);
252b5132
RH
257 }
258 }
866afedc
NC
259 /* repeati has a relocation, but its first argument is a plain
260 immediate. OTOH instructions like djsri have a pc-relative
d9a35582 261 delay target, but an absolute jump target. Therefore, a test
866afedc
NC
262 of insn->op->reloc_flag is not specific enough; we must test
263 if the actual operand we are handling now is pc-relative. */
264 else if (oper->flags & OPERAND_PCREL)
252b5132 265 {
866afedc 266 int neg = 0;
2dcee538 267
866afedc
NC
268 /* IMM6S3 is unsigned. */
269 if (oper->flags & OPERAND_SIGNED || bits == 32)
252b5132 270 {
866afedc
NC
271 long max;
272 max = (1 << (bits - 1));
273 if (val & max)
274 {
275 if (bits == 32)
276 val = -val;
277 else
2dcee538 278 val = -val & ((1 << bits) - 1);
866afedc
NC
279 neg = 1;
280 }
281 }
282 if (neg)
283 {
2dcee538 284 (*info->fprintf_func) (info->stream, "-%x\t(", val);
866afedc
NC
285 (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
286 (*info->fprintf_func) (info->stream, ")");
252b5132 287 }
866afedc 288 else
252b5132 289 {
2dcee538 290 (*info->fprintf_func) (info->stream, "%x\t(", val);
866afedc
NC
291 (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
292 (*info->fprintf_func) (info->stream, ")");
252b5132 293 }
252b5132
RH
294 }
295 else if (insn->op->reloc_flag == RELOC_ABS)
296 {
297 (*info->print_address_func) (val, info);
298 }
299 else
300 {
301 if (oper->flags & OPERAND_SIGNED)
302 {
303 int max = (1 << (bits - 1));
47b0e7ad 304
252b5132
RH
305 if (val & max)
306 {
307 val = -val;
308 if (bits < 32)
309 val &= ((1 << bits) - 1);
310 (*info->fprintf_func) (info->stream, "-");
311 }
312 }
2dcee538 313 (*info->fprintf_func) (info->stream, "0x%x", val);
252b5132 314 }
2dcee538 315 /* If there is another operand, then write a comma and space. */
252b5132
RH
316 if (insn->form->operands[opind] && !(found_control && opind == 2))
317 need_comma = 1;
318 }
319 if (need_paren)
320 (*info->fprintf_func) (info->stream, ")");
321}
322
47b0e7ad
NC
323int
324print_insn_d30v (bfd_vma memaddr, struct disassemble_info *info)
252b5132 325{
47b0e7ad
NC
326 int status, result;
327 bfd_byte buffer[12];
328 unsigned long in1, in2;
329 struct d30v_insn insn;
330 long long num;
252b5132 331
47b0e7ad
NC
332 insn.form = NULL;
333
334 info->bytes_per_line = 8;
335 info->bytes_per_chunk = 4;
336 info->display_endian = BFD_ENDIAN_BIG;
337
338 status = (*info->read_memory_func) (memaddr, buffer, 4, info);
339 if (status != 0)
252b5132 340 {
47b0e7ad
NC
341 (*info->memory_error_func) (status, memaddr, info);
342 return -1;
343 }
344 in1 = bfd_getb32 (buffer);
345
346 status = (*info->read_memory_func) (memaddr + 4, buffer, 4, info);
347 if (status != 0)
348 {
349 info->bytes_per_line = 8;
350 if (!(result = lookup_opcode (&insn, in1, 0)))
0fd3a477 351 (*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
47b0e7ad
NC
352 else
353 print_insn (info, memaddr, (long long) in1, &insn, 0, result);
354 return 4;
355 }
356 in2 = bfd_getb32 (buffer);
357
358 if (in1 & in2 & FM01)
359 {
360 /* LONG instruction. */
361 if (!(result = lookup_opcode (&insn, in1, 1)))
252b5132 362 {
0fd3a477 363 (*info->fprintf_func) (info->stream, ".long\t0x%lx,0x%lx", in1, in2);
47b0e7ad 364 return 8;
252b5132 365 }
47b0e7ad
NC
366 num = (long long) in1 << 32 | in2;
367 print_insn (info, memaddr, num, &insn, 1, result);
252b5132
RH
368 }
369 else
47b0e7ad
NC
370 {
371 num = in1;
372 if (!(result = lookup_opcode (&insn, in1, 0)))
0fd3a477 373 (*info->fprintf_func) (info->stream, ".long\t0x%lx", in1);
47b0e7ad
NC
374 else
375 print_insn (info, memaddr, num, &insn, 0, result);
252b5132 376
47b0e7ad
NC
377 switch (((in1 >> 31) << 1) | (in2 >> 31))
378 {
379 case 0:
380 (*info->fprintf_func) (info->stream, "\t||\t");
381 break;
382 case 1:
383 (*info->fprintf_func) (info->stream, "\t->\t");
384 break;
385 case 2:
386 (*info->fprintf_func) (info->stream, "\t<-\t");
387 default:
388 break;
389 }
252b5132 390
47b0e7ad
NC
391 insn.form = NULL;
392 num = in2;
393 if (!(result = lookup_opcode (&insn, in2, 0)))
0fd3a477 394 (*info->fprintf_func) (info->stream, ".long\t0x%lx", in2);
47b0e7ad
NC
395 else
396 print_insn (info, memaddr, num, &insn, 0, result);
397 }
398 return 8;
252b5132 399}