1 /* Disassembly routines for TMS320C30 architecture
2 Copyright 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
3 Contributed by Steven Haworth (steve@pm.cse.rmit.edu.au)
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
18 02111-1307, USA. */
19
20 #include <errno.h>
21 #include <math.h>
22 #include "sysdep.h"
23 #include "dis-asm.h"
24 #include "opcode/tic30.h"
25
26 #define NORMAL_INSN 1
27 #define PARALLEL_INSN 2
28
29 /* Gets the type of instruction based on the top 2 or 3 bits of the
30 instruction word. */
31 #define GET_TYPE(insn) (insn & 0x80000000 ? insn & 0xC0000000 : insn & 0xE0000000)
32
33 /* Instruction types. */
34 #define TWO_OPERAND_1 0x00000000
35 #define TWO_OPERAND_2 0x40000000
36 #define THREE_OPERAND 0x20000000
37 #define PAR_STORE 0xC0000000
38 #define MUL_ADDS 0x80000000
39 #define BRANCHES 0x60000000
40
41 /* Specific instruction id bits. */
42 #define NORMAL_IDEN 0x1F800000
43 #define PAR_STORE_IDEN 0x3E000000
44 #define MUL_ADD_IDEN 0x2C000000
45 #define BR_IMM_IDEN 0x1F000000
46 #define BR_COND_IDEN 0x1C3F0000
47
48 /* Addressing modes. */
49 #define AM_REGISTER 0x00000000
50 #define AM_DIRECT 0x00200000
51 #define AM_INDIRECT 0x00400000
52 #define AM_IMM 0x00600000
53
54 #define P_FIELD 0x03000000
55
56 #define REG_AR0 0x08
57 #define LDP_INSN 0x08700000
58
59 /* TMS320C30 program counter for current instruction. */
60 static unsigned int _pc;
61
62 struct instruction
63 {
64 int type;
65 template *tm;
66 partemplate *ptm;
67 };
68
69 int get_tic30_instruction PARAMS ((unsigned long, struct instruction *));
70 int print_two_operand
71 PARAMS ((disassemble_info *, unsigned long, struct instruction *));
72 int print_three_operand
73 PARAMS ((disassemble_info *, unsigned long, struct instruction *));
74 int print_par_insn
75 PARAMS ((disassemble_info *, unsigned long, struct instruction *));
76 int print_branch
77 PARAMS ((disassemble_info *, unsigned long, struct instruction *));
78 int get_indirect_operand PARAMS ((unsigned short, int, char *));
79 int get_register_operand PARAMS ((unsigned char, char *));
80 int cnvt_tmsfloat_ieee PARAMS ((unsigned long, int, float *));
81
82 int
print_insn_tic30(pc,info)83 print_insn_tic30 (pc, info)
84 bfd_vma pc;
85 disassemble_info *info;
86 {
87 unsigned long insn_word;
88 struct instruction insn = { 0, NULL, NULL };
89 bfd_vma bufaddr = pc - info->buffer_vma;
90 /* Obtain the current instruction word from the buffer. */
91 insn_word = (*(info->buffer + bufaddr) << 24) | (*(info->buffer + bufaddr + 1) << 16) |
92 (*(info->buffer + bufaddr + 2) << 8) | *(info->buffer + bufaddr + 3);
93 _pc = pc / 4;
94 /* Get the instruction refered to by the current instruction word
95 and print it out based on its type. */
96 if (!get_tic30_instruction (insn_word, &insn))
97 return -1;
98 switch (GET_TYPE (insn_word))
99 {
100 case TWO_OPERAND_1:
101 case TWO_OPERAND_2:
102 if (!print_two_operand (info, insn_word, &insn))
103 return -1;
104 break;
105 case THREE_OPERAND:
106 if (!print_three_operand (info, insn_word, &insn))
107 return -1;
108 break;
109 case PAR_STORE:
110 case MUL_ADDS:
111 if (!print_par_insn (info, insn_word, &insn))
112 return -1;
113 break;
114 case BRANCHES:
115 if (!print_branch (info, insn_word, &insn))
116 return -1;
117 break;
118 }
119 return 4;
120 }
121
122 int
get_tic30_instruction(insn_word,insn)123 get_tic30_instruction (insn_word, insn)
124 unsigned long insn_word;
125 struct instruction *insn;
126 {
127 switch (GET_TYPE (insn_word))
128 {
129 case TWO_OPERAND_1:
130 case TWO_OPERAND_2:
131 case THREE_OPERAND:
132 insn->type = NORMAL_INSN;
133 {
134 template *current_optab = (template *) tic30_optab;
135 for (; current_optab < tic30_optab_end; current_optab++)
136 {
137 if (GET_TYPE (current_optab->base_opcode) == GET_TYPE (insn_word))
138 {
139 if (current_optab->operands == 0)
140 {
141 if (current_optab->base_opcode == insn_word)
142 {
143 insn->tm = current_optab;
144 break;
145 }
146 }
147 else if ((current_optab->base_opcode & NORMAL_IDEN) == (insn_word & NORMAL_IDEN))
148 {
149 insn->tm = current_optab;
150 break;
151 }
152 }
153 }
154 }
155 break;
156 case PAR_STORE:
157 insn->type = PARALLEL_INSN;
158 {
159 partemplate *current_optab = (partemplate *) tic30_paroptab;
160 for (; current_optab < tic30_paroptab_end; current_optab++)
161 {
162 if (GET_TYPE (current_optab->base_opcode) == GET_TYPE (insn_word))
163 {
164 if ((current_optab->base_opcode & PAR_STORE_IDEN) == (insn_word & PAR_STORE_IDEN))
165 {
166 insn->ptm = current_optab;
167 break;
168 }
169 }
170 }
171 }
172 break;
173 case MUL_ADDS:
174 insn->type = PARALLEL_INSN;
175 {
176 partemplate *current_optab = (partemplate *) tic30_paroptab;
177 for (; current_optab < tic30_paroptab_end; current_optab++)
178 {
179 if (GET_TYPE (current_optab->base_opcode) == GET_TYPE (insn_word))
180 {
181 if ((current_optab->base_opcode & MUL_ADD_IDEN) == (insn_word & MUL_ADD_IDEN))
182 {
183 insn->ptm = current_optab;
184 break;
185 }
186 }
187 }
188 }
189 break;
190 case BRANCHES:
191 insn->type = NORMAL_INSN;
192 {
193 template *current_optab = (template *) tic30_optab;
194 for (; current_optab < tic30_optab_end; current_optab++)
195 {
196 if (GET_TYPE (current_optab->base_opcode) == GET_TYPE (insn_word))
197 {
198 if (current_optab->operand_types[0] & Imm24)
199 {
200 if ((current_optab->base_opcode & BR_IMM_IDEN) == (insn_word & BR_IMM_IDEN))
201 {
202 insn->tm = current_optab;
203 break;
204 }
205 }
206 else if (current_optab->operands > 0)
207 {
208 if ((current_optab->base_opcode & BR_COND_IDEN) == (insn_word & BR_COND_IDEN))
209 {
210 insn->tm = current_optab;
211 break;
212 }
213 }
214 else
215 {
216 if ((current_optab->base_opcode & (BR_COND_IDEN | 0x00800000)) == (insn_word & (BR_COND_IDEN | 0x00800000)))
217 {
218 insn->tm = current_optab;
219 break;
220 }
221 }
222 }
223 }
224 }
225 break;
226 default:
227 return 0;
228 }
229 return 1;
230 }
231
232 int
print_two_operand(info,insn_word,insn)233 print_two_operand (info, insn_word, insn)
234 disassemble_info *info;
235 unsigned long insn_word;
236 struct instruction *insn;
237 {
238 char name[12];
239 char operand[2][13] =
240 {
241 {0},
242 {0}};
243 float f_number;
244
245 if (insn->tm == NULL)
246 return 0;
247 strcpy (name, insn->tm->name);
248 if (insn->tm->opcode_modifier == AddressMode)
249 {
250 int src_op, dest_op;
251 /* Determine whether instruction is a store or a normal instruction. */
252 if ((insn->tm->operand_types[1] & (Direct | Indirect)) == (Direct | Indirect))
253 {
254 src_op = 1;
255 dest_op = 0;
256 }
257 else
258 {
259 src_op = 0;
260 dest_op = 1;
261 }
262 /* Get the destination register. */
263 if (insn->tm->operands == 2)
264 get_register_operand ((insn_word & 0x001F0000) >> 16, operand[dest_op]);
265 /* Get the source operand based on addressing mode. */
266 switch (insn_word & AddressMode)
267 {
268 case AM_REGISTER:
269 /* Check for the NOP instruction before getting the operand. */
270 if ((insn->tm->operand_types[0] & NotReq) == 0)
271 get_register_operand ((insn_word & 0x0000001F), operand[src_op]);
272 break;
273 case AM_DIRECT:
274 sprintf (operand[src_op], "@0x%lX", (insn_word & 0x0000FFFF));
275 break;
276 case AM_INDIRECT:
277 get_indirect_operand ((insn_word & 0x0000FFFF), 2, operand[src_op]);
278 break;
279 case AM_IMM:
280 /* Get the value of the immediate operand based on variable type. */
281 switch (insn->tm->imm_arg_type)
282 {
283 case Imm_Float:
284 cnvt_tmsfloat_ieee ((insn_word & 0x0000FFFF), 2, &f_number);
285 sprintf (operand[src_op], "%2.2f", f_number);
286 break;
287 case Imm_SInt:
288 sprintf (operand[src_op], "%d", (short) (insn_word & 0x0000FFFF));
289 break;
290 case Imm_UInt:
291 sprintf (operand[src_op], "%lu", (insn_word & 0x0000FFFF));
292 break;
293 default:
294 return 0;
295 }
296 /* Handle special case for LDP instruction. */
297 if ((insn_word & 0xFFFFFF00) == LDP_INSN)
298 {
299 strcpy (name, "ldp");
300 sprintf (operand[0], "0x%06lX", (insn_word & 0x000000FF) << 16);
301 operand[1][0] = '\0';
302 }
303 }
304 }
305 /* Handle case for stack and rotate instructions. */
306 else if (insn->tm->operands == 1)
307 {
308 if (insn->tm->opcode_modifier == StackOp)
309 {
310 get_register_operand ((insn_word & 0x001F0000) >> 16, operand[0]);
311 }
312 }
313 /* Output instruction to stream. */
314 info->fprintf_func (info->stream, " %s %s%c%s", name,
315 operand[0][0] ? operand[0] : "",
316 operand[1][0] ? ',' : ' ',
317 operand[1][0] ? operand[1] : "");
318 return 1;
319 }
320
321 int
print_three_operand(info,insn_word,insn)322 print_three_operand (info, insn_word, insn)
323 disassemble_info *info;
324 unsigned long insn_word;
325 struct instruction *insn;
326 {
327 char operand[3][13] =
328 {
329 {0},
330 {0},
331 {0}};
332
333 if (insn->tm == NULL)
334 return 0;
335 switch (insn_word & AddressMode)
336 {
337 case AM_REGISTER:
338 get_register_operand ((insn_word & 0x000000FF), operand[0]);
339 get_register_operand ((insn_word & 0x0000FF00) >> 8, operand[1]);
340 break;
341 case AM_DIRECT:
342 get_register_operand ((insn_word & 0x000000FF), operand[0]);
343 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1]);
344 break;
345 case AM_INDIRECT:
346 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0]);
347 get_register_operand ((insn_word & 0x0000FF00) >> 8, operand[1]);
348 break;
349 case AM_IMM:
350 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0]);
351 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1]);
352 break;
353 default:
354 return 0;
355 }
356 if (insn->tm->operands == 3)
357 get_register_operand ((insn_word & 0x001F0000) >> 16, operand[2]);
358 info->fprintf_func (info->stream, " %s %s,%s%c%s", insn->tm->name,
359 operand[0], operand[1],
360 operand[2][0] ? ',' : ' ',
361 operand[2][0] ? operand[2] : "");
362 return 1;
363 }
364
365 int
print_par_insn(info,insn_word,insn)366 print_par_insn (info, insn_word, insn)
367 disassemble_info *info;
368 unsigned long insn_word;
369 struct instruction *insn;
370 {
371 size_t i, len;
372 char *name1, *name2;
373 char operand[2][3][13] =
374 {
375 {
376 {0},
377 {0},
378 {0}},
379 {
380 {0},
381 {0},
382 {0}}};
383
384 if (insn->ptm == NULL)
385 return 0;
386 /* Parse out the names of each of the parallel instructions from the
387 q_insn1_insn2 format. */
388 name1 = (char *) strdup (insn->ptm->name + 2);
389 name2 = "";
390 len = strlen (name1);
391 for (i = 0; i < len; i++)
392 {
393 if (name1[i] == '_')
394 {
395 name2 = &name1[i + 1];
396 name1[i] = '\0';
397 break;
398 }
399 }
400 /* Get the operands of the instruction based on the operand order. */
401 switch (insn->ptm->oporder)
402 {
403 case OO_4op1:
404 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0][0]);
405 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1][1]);
406 get_register_operand ((insn_word >> 16) & 0x07, operand[1][0]);
407 get_register_operand ((insn_word >> 22) & 0x07, operand[0][1]);
408 break;
409 case OO_4op2:
410 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0][0]);
411 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1][0]);
412 get_register_operand ((insn_word >> 19) & 0x07, operand[1][1]);
413 get_register_operand ((insn_word >> 22) & 0x07, operand[0][1]);
414 break;
415 case OO_4op3:
416 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0][1]);
417 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1][1]);
418 get_register_operand ((insn_word >> 16) & 0x07, operand[1][0]);
419 get_register_operand ((insn_word >> 22) & 0x07, operand[0][0]);
420 break;
421 case OO_5op1:
422 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0][0]);
423 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1][1]);
424 get_register_operand ((insn_word >> 16) & 0x07, operand[1][0]);
425 get_register_operand ((insn_word >> 19) & 0x07, operand[0][1]);
426 get_register_operand ((insn_word >> 22) & 0x07, operand[0][2]);
427 break;
428 case OO_5op2:
429 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0][1]);
430 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1][1]);
431 get_register_operand ((insn_word >> 16) & 0x07, operand[1][0]);
432 get_register_operand ((insn_word >> 19) & 0x07, operand[0][0]);
433 get_register_operand ((insn_word >> 22) & 0x07, operand[0][2]);
434 break;
435 case OO_PField:
436 if (insn_word & 0x00800000)
437 get_register_operand (0x01, operand[0][2]);
438 else
439 get_register_operand (0x00, operand[0][2]);
440 if (insn_word & 0x00400000)
441 get_register_operand (0x03, operand[1][2]);
442 else
443 get_register_operand (0x02, operand[1][2]);
444 switch (insn_word & P_FIELD)
445 {
446 case 0x00000000:
447 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[0][1]);
448 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[0][0]);
449 get_register_operand ((insn_word >> 16) & 0x07, operand[1][1]);
450 get_register_operand ((insn_word >> 19) & 0x07, operand[1][0]);
451 break;
452 case 0x01000000:
453 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[1][0]);
454 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[0][0]);
455 get_register_operand ((insn_word >> 16) & 0x07, operand[1][1]);
456 get_register_operand ((insn_word >> 19) & 0x07, operand[0][1]);
457 break;
458 case 0x02000000:
459 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[1][1]);
460 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[1][0]);
461 get_register_operand ((insn_word >> 16) & 0x07, operand[0][1]);
462 get_register_operand ((insn_word >> 19) & 0x07, operand[0][0]);
463 break;
464 case 0x03000000:
465 get_indirect_operand ((insn_word & 0x000000FF), 1, operand[1][1]);
466 get_indirect_operand ((insn_word & 0x0000FF00) >> 8, 1, operand[0][0]);
467 get_register_operand ((insn_word >> 16) & 0x07, operand[1][0]);
468 get_register_operand ((insn_word >> 19) & 0x07, operand[0][1]);
469 break;
470 }
471 break;
472 default:
473 return 0;
474 }
475 info->fprintf_func (info->stream, " %s %s,%s%c%s", name1,
476 operand[0][0], operand[0][1],
477 operand[0][2][0] ? ',' : ' ',
478 operand[0][2][0] ? operand[0][2] : "");
479 info->fprintf_func (info->stream, "\n\t\t\t|| %s %s,%s%c%s", name2,
480 operand[1][0], operand[1][1],
481 operand[1][2][0] ? ',' : ' ',
482 operand[1][2][0] ? operand[1][2] : "");
483 free (name1);
484 return 1;
485 }
486
487 int
print_branch(info,insn_word,insn)488 print_branch (info, insn_word, insn)
489 disassemble_info *info;
490 unsigned long insn_word;
491 struct instruction *insn;
492 {
493 char operand[2][13] =
494 {
495 {0},
496 {0}};
497 unsigned long address;
498 int print_label = 0;
499
500 if (insn->tm == NULL)
501 return 0;
502 /* Get the operands for 24-bit immediate jumps. */
503 if (insn->tm->operand_types[0] & Imm24)
504 {
505 address = insn_word & 0x00FFFFFF;
506 sprintf (operand[0], "0x%lX", address);
507 print_label = 1;
508 }
509 /* Get the operand for the trap instruction. */
510 else if (insn->tm->operand_types[0] & IVector)
511 {
512 address = insn_word & 0x0000001F;
513 sprintf (operand[0], "0x%lX", address);
514 }
515 else
516 {
517 address = insn_word & 0x0000FFFF;
518 /* Get the operands for the DB instructions. */
519 if (insn->tm->operands == 2)
520 {
521 get_register_operand (((insn_word & 0x01C00000) >> 22) + REG_AR0, operand[0]);
522 if (insn_word & PCRel)
523 {
524 sprintf (operand[1], "%d", (short) address);
525 print_label = 1;
526 }
527 else
528 get_register_operand (insn_word & 0x0000001F, operand[1]);
529 }
530 /* Get the operands for the standard branches. */
531 else if (insn->tm->operands == 1)
532 {
533 if (insn_word & PCRel)
534 {
535 address = (short) address;
536 sprintf (operand[0], "%ld", address);
537 print_label = 1;
538 }
539 else
540 get_register_operand (insn_word & 0x0000001F, operand[0]);
541 }
542 }
543 info->fprintf_func (info->stream, " %s %s%c%s", insn->tm->name,
544 operand[0][0] ? operand[0] : "",
545 operand[1][0] ? ',' : ' ',
546 operand[1][0] ? operand[1] : "");
547 /* Print destination of branch in relation to current symbol. */
548 if (print_label && info->symbols)
549 {
550 asymbol *sym = *info->symbols;
551
552 if ((insn->tm->opcode_modifier == PCRel) && (insn_word & PCRel))
553 {
554 address = (_pc + 1 + (short) address) - ((sym->section->vma + sym->value) / 4);
555 /* Check for delayed instruction, if so adjust destination. */
556 if (insn_word & 0x00200000)
557 address += 2;
558 }
559 else
560 {
561 address -= ((sym->section->vma + sym->value) / 4);
562 }
563 if (address == 0)
564 info->fprintf_func (info->stream, " <%s>", sym->name);
565 else
566 info->fprintf_func (info->stream, " <%s %c %d>", sym->name,
567 ((short) address < 0) ? '-' : '+',
568 abs (address));
569 }
570 return 1;
571 }
572
573 int
get_indirect_operand(fragment,size,buffer)574 get_indirect_operand (fragment, size, buffer)
575 unsigned short fragment;
576 int size;
577 char *buffer;
578 {
579 unsigned char mod;
580 unsigned arnum;
581 unsigned char disp;
582
583 if (buffer == NULL)
584 return 0;
585 /* Determine which bits identify the sections of the indirect
586 operand based on the size in bytes. */
587 switch (size)
588 {
589 case 1:
590 mod = (fragment & 0x00F8) >> 3;
591 arnum = (fragment & 0x0007);
592 disp = 0;
593 break;
594 case 2:
595 mod = (fragment & 0xF800) >> 11;
596 arnum = (fragment & 0x0700) >> 8;
597 disp = (fragment & 0x00FF);
598 break;
599 default:
600 return 0;
601 }
602 {
603 const ind_addr_type *current_ind = tic30_indaddr_tab;
604 for (; current_ind < tic30_indaddrtab_end; current_ind++)
605 {
606 if (current_ind->modfield == mod)
607 {
608 if (current_ind->displacement == IMPLIED_DISP && size == 2)
609 {
610 continue;
611 }
612 else
613 {
614 size_t i, len;
615 int bufcnt;
616
617 len = strlen (current_ind->syntax);
618 for (i = 0, bufcnt = 0; i < len; i++, bufcnt++)
619 {
620 buffer[bufcnt] = current_ind->syntax[i];
621 if (buffer[bufcnt - 1] == 'a' && buffer[bufcnt] == 'r')
622 buffer[++bufcnt] = arnum + '0';
623 if (buffer[bufcnt] == '('
624 && current_ind->displacement == DISP_REQUIRED)
625 {
626 sprintf (&buffer[bufcnt + 1], "%u", disp);
627 bufcnt += strlen (&buffer[bufcnt + 1]);
628 }
629 }
630 buffer[bufcnt + 1] = '\0';
631 break;
632 }
633 }
634 }
635 }
636 return 1;
637 }
638
639 int
get_register_operand(fragment,buffer)640 get_register_operand (fragment, buffer)
641 unsigned char fragment;
642 char *buffer;
643 {
644 const reg *current_reg = tic30_regtab;
645
646 if (buffer == NULL)
647 return 0;
648 for (; current_reg < tic30_regtab_end; current_reg++)
649 {
650 if ((fragment & 0x1F) == current_reg->opcode)
651 {
652 strcpy (buffer, current_reg->name);
653 return 1;
654 }
655 }
656 return 0;
657 }
658
659 int
cnvt_tmsfloat_ieee(tmsfloat,size,ieeefloat)660 cnvt_tmsfloat_ieee (tmsfloat, size, ieeefloat)
661 unsigned long tmsfloat;
662 int size;
663 float *ieeefloat;
664 {
665 unsigned long exp, sign, mant;
666 union {
667 unsigned long l;
668 float f;
669 } val;
670
671 if (size == 2)
672 {
673 if ((tmsfloat & 0x0000F000) == 0x00008000)
674 tmsfloat = 0x80000000;
675 else
676 {
677 tmsfloat <<= 16;
678 tmsfloat = (long) tmsfloat >> 4;
679 }
680 }
681 exp = tmsfloat & 0xFF000000;
682 if (exp == 0x80000000)
683 {
684 *ieeefloat = 0.0;
685 return 1;
686 }
687 exp += 0x7F000000;
688 sign = (tmsfloat & 0x00800000) << 8;
689 mant = tmsfloat & 0x007FFFFF;
690 if (exp == 0xFF000000)
691 {
692 if (mant == 0)
693 *ieeefloat = ERANGE;
694 if (sign == 0)
695 *ieeefloat = 1.0 / 0.0;
696 else
697 *ieeefloat = -1.0 / 0.0;
698 return 1;
699 }
700 exp >>= 1;
701 if (sign)
702 {
703 mant = (~mant) & 0x007FFFFF;
704 mant += 1;
705 exp += mant & 0x00800000;
706 exp &= 0x7F800000;
707 mant &= 0x007FFFFF;
708 }
709 if (tmsfloat == 0x80000000)
710 sign = mant = exp = 0;
711 tmsfloat = sign | exp | mant;
712 val.l = tmsfloat;
713 *ieeefloat = val.f;
714 return 1;
715 }
716