1 /* Instruction printing code for the AMD 29000
2 Copyright 1990, 1993, 1994, 1995, 1998, 2000, 2001, 2002
3 Free Software Foundation, Inc.
4 Contributed by Cygnus Support. Written by Jim Kingdon.
5
6 This file is part of GDB.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22 #include "sysdep.h"
23 #include "dis-asm.h"
24 #include "opcode/a29k.h"
25
26 static void print_general PARAMS ((int, struct disassemble_info *));
27 static void print_special PARAMS ((unsigned int, struct disassemble_info *));
28 static int is_delayed_branch PARAMS ((int));
29 static void find_bytes_little
30 PARAMS ((char *, unsigned char *, unsigned char *, unsigned char *,
31 unsigned char *));
32 static void find_bytes_big
33 PARAMS ((char *, unsigned char *, unsigned char *, unsigned char *,
34 unsigned char *));
35 static int print_insn PARAMS ((bfd_vma, struct disassemble_info *));
36
37
38 /* Print a symbolic representation of a general-purpose
39 register number NUM on STREAM.
40 NUM is a number as found in the instruction, not as found in
41 debugging symbols; it must be in the range 0-255. */
42 static void
print_general(num,info)43 print_general (num, info)
44 int num;
45 struct disassemble_info *info;
46 {
47 if (num < 128)
48 (*info->fprintf_func) (info->stream, "gr%d", num);
49 else
50 (*info->fprintf_func) (info->stream, "lr%d", num - 128);
51 }
52
53 /* Like print_general but a special-purpose register.
54
55 The mnemonics used by the AMD assembler are not quite the same
56 as the ones in the User's Manual. We use the ones that the
57 assembler uses. */
58 static void
print_special(num,info)59 print_special (num, info)
60 unsigned int num;
61 struct disassemble_info *info;
62 {
63 /* Register names of registers 0-SPEC0_NUM-1. */
64 static char *spec0_names[] = {
65 "vab", "ops", "cps", "cfg", "cha", "chd", "chc", "rbp", "tmc", "tmr",
66 "pc0", "pc1", "pc2", "mmu", "lru", "rsn", "rma0", "rmc0", "rma1", "rmc1",
67 "spc0", "spc1", "spc2", "iba0", "ibc0", "iba1", "ibc1", "dba", "dbc",
68 "cir", "cdr"
69 };
70 #define SPEC0_NUM ((sizeof spec0_names) / (sizeof spec0_names[0]))
71
72 /* Register names of registers 128-128+SPEC128_NUM-1. */
73 static char *spec128_names[] = {
74 "ipc", "ipa", "ipb", "q", "alu", "bp", "fc", "cr"
75 };
76 #define SPEC128_NUM ((sizeof spec128_names) / (sizeof spec128_names[0]))
77
78 /* Register names of registers 160-160+SPEC160_NUM-1. */
79 static char *spec160_names[] = {
80 "fpe", "inte", "fps", "sr163", "exop"
81 };
82 #define SPEC160_NUM ((sizeof spec160_names) / (sizeof spec160_names[0]))
83
84 if (num < SPEC0_NUM)
85 (*info->fprintf_func) (info->stream, spec0_names[num]);
86 else if (num >= 128 && num < 128 + SPEC128_NUM)
87 (*info->fprintf_func) (info->stream, spec128_names[num-128]);
88 else if (num >= 160 && num < 160 + SPEC160_NUM)
89 (*info->fprintf_func) (info->stream, spec160_names[num-160]);
90 else
91 (*info->fprintf_func) (info->stream, "sr%d", num);
92 }
93
94 /* Is an instruction with OPCODE a delayed branch? */
95 static int
is_delayed_branch(opcode)96 is_delayed_branch (opcode)
97 int opcode;
98 {
99 return (opcode == 0xa8 || opcode == 0xa9 || opcode == 0xa0 || opcode == 0xa1
100 || opcode == 0xa4 || opcode == 0xa5
101 || opcode == 0xb4 || opcode == 0xb5
102 || opcode == 0xc4 || opcode == 0xc0
103 || opcode == 0xac || opcode == 0xad
104 || opcode == 0xcc);
105 }
106
107 /* Now find the four bytes of INSN and put them in *INSN{0,8,16,24}. */
108 static void
find_bytes_big(insn,insn0,insn8,insn16,insn24)109 find_bytes_big (insn, insn0, insn8, insn16, insn24)
110 char *insn;
111 unsigned char *insn0;
112 unsigned char *insn8;
113 unsigned char *insn16;
114 unsigned char *insn24;
115 {
116 *insn24 = insn[0];
117 *insn16 = insn[1];
118 *insn8 = insn[2];
119 *insn0 = insn[3];
120 }
121
122 static void
find_bytes_little(insn,insn0,insn8,insn16,insn24)123 find_bytes_little (insn, insn0, insn8, insn16, insn24)
124 char *insn;
125 unsigned char *insn0;
126 unsigned char *insn8;
127 unsigned char *insn16;
128 unsigned char *insn24;
129 {
130 *insn24 = insn[3];
131 *insn16 = insn[2];
132 *insn8 = insn[1];
133 *insn0 = insn[0];
134 }
135
136 typedef void (*find_byte_func_type)
137 PARAMS ((char *, unsigned char *, unsigned char *,
138 unsigned char *, unsigned char *));
139
140 /* Print one instruction from MEMADDR on INFO->STREAM.
141 Return the size of the instruction (always 4 on a29k). */
142
143 static int
print_insn(memaddr,info)144 print_insn (memaddr, info)
145 bfd_vma memaddr;
146 struct disassemble_info *info;
147 {
148 /* The raw instruction. */
149 char insn[4];
150
151 /* The four bytes of the instruction. */
152 unsigned char insn24, insn16, insn8, insn0;
153
154 find_byte_func_type find_byte_func = (find_byte_func_type)info->private_data;
155
156 struct a29k_opcode const * opcode;
157
158 {
159 int status =
160 (*info->read_memory_func) (memaddr, (bfd_byte *) &insn[0], 4, info);
161 if (status != 0)
162 {
163 (*info->memory_error_func) (status, memaddr, info);
164 return -1;
165 }
166 }
167
168 (*find_byte_func) (insn, &insn0, &insn8, &insn16, &insn24);
169
170 printf ("%02x%02x%02x%02x ", insn24, insn16, insn8, insn0);
171
172 /* Handle the nop (aseq 0x40,gr1,gr1) specially */
173 if ((insn24==0x70) && (insn16==0x40) && (insn8==0x01) && (insn0==0x01)) {
174 (*info->fprintf_func) (info->stream,"nop");
175 return 4;
176 }
177
178 /* The opcode is always in insn24. */
179 for (opcode = &a29k_opcodes[0];
180 opcode < &a29k_opcodes[num_opcodes];
181 ++opcode)
182 {
183 if (((unsigned long) insn24 << 24) == opcode->opcode)
184 {
185 char *s;
186
187 (*info->fprintf_func) (info->stream, "%s ", opcode->name);
188 for (s = opcode->args; *s != '\0'; ++s)
189 {
190 switch (*s)
191 {
192 case 'a':
193 print_general (insn8, info);
194 break;
195
196 case 'b':
197 print_general (insn0, info);
198 break;
199
200 case 'c':
201 print_general (insn16, info);
202 break;
203
204 case 'i':
205 (*info->fprintf_func) (info->stream, "%d", insn0);
206 break;
207
208 case 'x':
209 (*info->fprintf_func) (info->stream, "0x%x", (insn16 << 8) + insn0);
210 break;
211
212 case 'h':
213 /* This used to be %x for binutils. */
214 (*info->fprintf_func) (info->stream, "0x%x",
215 (insn16 << 24) + (insn0 << 16));
216 break;
217
218 case 'X':
219 (*info->fprintf_func) (info->stream, "%d",
220 ((insn16 << 8) + insn0) | 0xffff0000);
221 break;
222
223 case 'P':
224 /* This output looks just like absolute addressing, but
225 maybe that's OK (it's what the GDB m68k and EBMON
226 a29k disassemblers do). */
227 /* All the shifting is to sign-extend it. p*/
228 (*info->print_address_func)
229 (memaddr +
230 (((int)((insn16 << 10) + (insn0 << 2)) << 14) >> 14),
231 info);
232 break;
233
234 case 'A':
235 (*info->print_address_func)
236 ((insn16 << 10) + (insn0 << 2), info);
237 break;
238
239 case 'e':
240 (*info->fprintf_func) (info->stream, "%d", insn16 >> 7);
241 break;
242
243 case 'n':
244 (*info->fprintf_func) (info->stream, "0x%x", insn16 & 0x7f);
245 break;
246
247 case 'v':
248 (*info->fprintf_func) (info->stream, "0x%x", insn16);
249 break;
250
251 case 's':
252 print_special (insn8, info);
253 break;
254
255 case 'u':
256 (*info->fprintf_func) (info->stream, "%d", insn0 >> 7);
257 break;
258
259 case 'r':
260 (*info->fprintf_func) (info->stream, "%d", (insn0 >> 4) & 7);
261 break;
262
263 case 'I':
264 if ((insn16 & 3) != 0)
265 (*info->fprintf_func) (info->stream, "%d", insn16 & 3);
266 break;
267
268 case 'd':
269 (*info->fprintf_func) (info->stream, "%d", (insn0 >> 2) & 3);
270 break;
271
272 case 'f':
273 (*info->fprintf_func) (info->stream, "%d", insn0 & 3);
274 break;
275
276 case 'F':
277 (*info->fprintf_func) (info->stream, "%d", (insn16 >> 2) & 15);
278 break;
279
280 case 'C':
281 (*info->fprintf_func) (info->stream, "%d", insn16 & 3);
282 break;
283
284 default:
285 (*info->fprintf_func) (info->stream, "%c", *s);
286 }
287 }
288
289 /* Now we look for a const,consth pair of instructions,
290 in which case we try to print the symbolic address. */
291 if (insn24 == 2) /* consth */
292 {
293 int errcode;
294 char prev_insn[4];
295 unsigned char prev_insn0, prev_insn8, prev_insn16, prev_insn24;
296
297 errcode = (*info->read_memory_func) (memaddr - 4,
298 (bfd_byte *) &prev_insn[0],
299 4,
300 info);
301 if (errcode == 0)
302 {
303 /* If it is a delayed branch, we need to look at the
304 instruction before the delayed brach to handle
305 things like
306
307 const _foo
308 call _printf
309 consth _foo
310 */
311 (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8,
312 &prev_insn16, &prev_insn24);
313 if (is_delayed_branch (prev_insn24))
314 {
315 errcode = (*info->read_memory_func)
316 (memaddr - 8, (bfd_byte *) &prev_insn[0], 4, info);
317 (*find_byte_func) (prev_insn, &prev_insn0, &prev_insn8,
318 &prev_insn16, &prev_insn24);
319 }
320 }
321
322 /* If there was a problem reading memory, then assume
323 the previous instruction was not const. */
324 if (errcode == 0)
325 {
326 /* Is it const to the same register? */
327 if (prev_insn24 == 3
328 && prev_insn8 == insn8)
329 {
330 (*info->fprintf_func) (info->stream, "\t; ");
331 (*info->print_address_func)
332 (((insn16 << 24) + (insn0 << 16)
333 + (prev_insn16 << 8) + (prev_insn0)),
334 info);
335 }
336 }
337 }
338
339 return 4;
340 }
341 }
342 /* This used to be %8x for binutils. */
343 (*info->fprintf_func)
344 (info->stream, ".word 0x%08x",
345 (insn24 << 24) + (insn16 << 16) + (insn8 << 8) + insn0);
346 return 4;
347 }
348
349 /* Disassemble an big-endian a29k instruction. */
350 int
print_insn_big_a29k(memaddr,info)351 print_insn_big_a29k (memaddr, info)
352 bfd_vma memaddr;
353 struct disassemble_info *info;
354 {
355 info->private_data = (PTR) find_bytes_big;
356 return print_insn (memaddr, info);
357 }
358
359 /* Disassemble a little-endian a29k instruction. */
360 int
print_insn_little_a29k(memaddr,info)361 print_insn_little_a29k (memaddr, info)
362 bfd_vma memaddr;
363 struct disassemble_info *info;
364 {
365 info->private_data = (PTR) find_bytes_little;
366 return print_insn (memaddr, info);
367 }
368