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7857f134 | 1 | @ libgcc routines for ARM cpu. |
bd28bf5a | 2 | @ Division routines, written by Richard Earnshaw, (rearnsha@armltd.co.uk) |
454e0249 | 3 | |
7405dc37 | 4 | /* Copyright 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc. |
454e0249 DE |
5 | |
6 | This file is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by the | |
8 | Free Software Foundation; either version 2, or (at your option) any | |
9 | later version. | |
10 | ||
11 | In addition to the permissions in the GNU General Public License, the | |
12 | Free Software Foundation gives you unlimited permission to link the | |
f7af368f JL |
13 | compiled version of this file into combinations with other programs, |
14 | and to distribute those combinations without any restriction coming | |
15 | from the use of this file. (The General Public License restrictions | |
16 | do apply in other respects; for example, they cover modification of | |
17 | the file, and distribution when not linked into a combine | |
18 | executable.) | |
454e0249 DE |
19 | |
20 | This file is distributed in the hope that it will be useful, but | |
21 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
23 | General Public License for more details. | |
24 | ||
25 | You should have received a copy of the GNU General Public License | |
26 | along with this program; see the file COPYING. If not, write to | |
8fb289e7 RK |
27 | the Free Software Foundation, 59 Temple Place - Suite 330, |
28 | Boston, MA 02111-1307, USA. */ | |
6dcd26ea | 29 | /* ------------------------------------------------------------------------ */ |
888e552f NC |
30 | |
31 | /* We need to know what prefix to add to function names. */ | |
32 | ||
2a5307b1 NC |
33 | #ifndef __USER_LABEL_PREFIX__ |
34 | #error __USER_LABEL_PREFIX__ not defined | |
35 | #endif | |
36 | ||
a1e27b76 NC |
37 | /* ANSI concatenation macros. */ |
38 | ||
39 | #define CONCAT1(a, b) CONCAT2(a, b) | |
40 | #define CONCAT2(a, b) a ## b | |
41 | ||
42 | /* Use the right prefix for global labels. */ | |
43 | ||
44 | #define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__, x) | |
45 | ||
140fa895 | 46 | #ifdef __ELF__ |
d5b7b3ae | 47 | #ifdef __thumb__ |
6dcd26ea | 48 | #define __PLT__ /* Not supported in Thumb assembler (for now). */ |
d5b7b3ae | 49 | #else |
b355a481 | 50 | #define __PLT__ (PLT) |
d5b7b3ae | 51 | #endif |
b355a481 NC |
52 | #define TYPE(x) .type SYM(x),function |
53 | #define SIZE(x) .size SYM(x), . - SYM(x) | |
54 | #else | |
55 | #define __PLT__ | |
56 | #define TYPE(x) | |
57 | #define SIZE(x) | |
58 | #endif | |
59 | ||
6dcd26ea | 60 | /* Function end macros. Variants for 26 bit APCS and interworking. */ |
888e552f | 61 | |
6dcd26ea RE |
62 | #ifdef __APCS_26__ |
63 | # define RET movs pc, lr | |
64 | # define RETc(x) mov##x##s pc, lr | |
65 | # define RETCOND ^ | |
66 | .macro ARM_LDIV0 | |
67 | Ldiv0: | |
68 | str lr, [sp, #-4]! | |
69 | bl SYM (__div0) __PLT__ | |
70 | mov r0, #0 @ About as wrong as it could be. | |
71 | ldmia sp!, {pc}^ | |
72 | .endm | |
73 | #else | |
74 | # ifdef __THUMB_INTERWORK__ | |
75 | # define RET bx lr | |
76 | # define RETc(x) bx##x lr | |
77 | .macro THUMB_LDIV0 | |
888e552f | 78 | Ldiv0: |
6dcd26ea RE |
79 | push { lr } |
80 | bl SYM (__div0) | |
81 | mov r0, #0 @ About as wrong as it could be. | |
82 | pop { r1 } | |
83 | bx r1 | |
84 | .endm | |
85 | .macro ARM_LDIV0 | |
888e552f | 86 | Ldiv0: |
6dcd26ea RE |
87 | str lr, [sp, #-4]! |
88 | bl SYM (__div0) __PLT__ | |
89 | mov r0, #0 @ About as wrong as it could be. | |
90 | ldr lr, [sp], #4 | |
91 | bx lr | |
92 | .endm | |
93 | # else | |
94 | # define RET mov pc, lr | |
95 | # define RETc(x) mov##x pc, lr | |
96 | .macro THUMB_LDIV0 | |
888e552f | 97 | Ldiv0: |
6dcd26ea RE |
98 | push { lr } |
99 | bl SYM (__div0) | |
100 | mov r0, #0 @ About as wrong as it could be. | |
101 | pop { pc } | |
102 | .endm | |
103 | .macro ARM_LDIV0 | |
888e552f | 104 | Ldiv0: |
6dcd26ea RE |
105 | str lr, [sp, #-4]! |
106 | bl SYM (__div0) __PLT__ | |
107 | mov r0, #0 @ About as wrong as it could be. | |
108 | ldmia sp!, {pc} | |
109 | .endm | |
110 | # endif | |
111 | # define RETCOND | |
112 | #endif | |
113 | ||
888e552f NC |
114 | .macro FUNC_END name |
115 | Ldiv0: | |
116 | #ifdef __thumb__ | |
117 | THUMB_LDIV0 | |
118 | #else | |
119 | ARM_LDIV0 | |
120 | #endif | |
121 | SIZE (__\name) | |
122 | .endm | |
123 | ||
124 | .macro THUMB_FUNC_START name | |
125 | .globl SYM (\name) | |
126 | TYPE (\name) | |
127 | .thumb_func | |
128 | SYM (\name): | |
129 | .endm | |
130 | ||
131 | /* Function start macros. Variants for ARM and Thumb. */ | |
132 | ||
d5b7b3ae RE |
133 | #ifdef __thumb__ |
134 | #define THUMB_FUNC .thumb_func | |
135 | #define THUMB_CODE .force_thumb | |
136 | #else | |
137 | #define THUMB_FUNC | |
138 | #define THUMB_CODE | |
139 | #endif | |
140 | ||
d5b7b3ae RE |
141 | .macro FUNC_START name |
142 | .text | |
143 | .globl SYM (__\name) | |
144 | TYPE (__\name) | |
145 | .align 0 | |
146 | THUMB_CODE | |
147 | THUMB_FUNC | |
148 | SYM (__\name): | |
149 | .endm | |
6dcd26ea | 150 | |
888e552f | 151 | /* Register aliases. */ |
454e0249 | 152 | |
888e552f | 153 | work .req r4 @ XXXX is this safe ? |
bd28bf5a RE |
154 | dividend .req r0 |
155 | divisor .req r1 | |
888e552f | 156 | overdone .req r2 |
bd28bf5a RE |
157 | result .req r2 |
158 | curbit .req r3 | |
159 | ip .req r12 | |
160 | sp .req r13 | |
161 | lr .req r14 | |
162 | pc .req r15 | |
454e0249 | 163 | |
888e552f NC |
164 | /* ------------------------------------------------------------------------ */ |
165 | /* Bodies of the divsion and modulo routines. */ | |
166 | /* ------------------------------------------------------------------------ */ | |
167 | .macro ARM_DIV_MOD_BODY modulo | |
bd28bf5a RE |
168 | Loop1: |
169 | @ Unless the divisor is very big, shift it up in multiples of | |
170 | @ four bits, since this is the amount of unwinding in the main | |
171 | @ division loop. Continue shifting until the divisor is | |
172 | @ larger than the dividend. | |
173 | cmp divisor, #0x10000000 | |
02689e18 NC |
174 | cmplo divisor, dividend |
175 | movlo divisor, divisor, lsl #4 | |
176 | movlo curbit, curbit, lsl #4 | |
177 | blo Loop1 | |
bd28bf5a RE |
178 | |
179 | Lbignum: | |
180 | @ For very big divisors, we must shift it a bit at a time, or | |
181 | @ we will be in danger of overflowing. | |
182 | cmp divisor, #0x80000000 | |
02689e18 NC |
183 | cmplo divisor, dividend |
184 | movlo divisor, divisor, lsl #1 | |
185 | movlo curbit, curbit, lsl #1 | |
186 | blo Lbignum | |
bd28bf5a RE |
187 | |
188 | Loop3: | |
888e552f NC |
189 | @ Test for possible subtractions. On the final pass, this may |
190 | @ subtract too much from the dividend ... | |
191 | ||
192 | .if \modulo | |
193 | @ ... so keep track of which subtractions are done in OVERDONE. | |
194 | @ We can fix them up afterwards. | |
195 | mov overdone, #0 | |
bd28bf5a | 196 | cmp dividend, divisor |
02689e18 | 197 | subhs dividend, dividend, divisor |
888e552f | 198 | cmp dividend, divisor, lsr #1 |
02689e18 NC |
199 | subhs dividend, dividend, divisor, lsr #1 |
200 | orrhs overdone, overdone, curbit, ror #1 | |
888e552f | 201 | cmp dividend, divisor, lsr #2 |
02689e18 NC |
202 | subhs dividend, dividend, divisor, lsr #2 |
203 | orrhs overdone, overdone, curbit, ror #2 | |
888e552f | 204 | cmp dividend, divisor, lsr #3 |
02689e18 NC |
205 | subhs dividend, dividend, divisor, lsr #3 |
206 | orrhs overdone, overdone, curbit, ror #3 | |
888e552f NC |
207 | mov ip, curbit |
208 | .else | |
209 | @ ... so keep track of which subtractions are done in RESULT. | |
210 | @ The result will be ok, since the "bit" will have been | |
211 | @ shifted out at the bottom. | |
212 | cmp dividend, divisor | |
02689e18 NC |
213 | subhs dividend, dividend, divisor |
214 | orrhs result, result, curbit | |
888e552f | 215 | cmp dividend, divisor, lsr #1 |
02689e18 NC |
216 | subhs dividend, dividend, divisor, lsr #1 |
217 | orrhs result, result, curbit, lsr #1 | |
888e552f | 218 | cmp dividend, divisor, lsr #2 |
02689e18 NC |
219 | subhs dividend, dividend, divisor, lsr #2 |
220 | orrhs result, result, curbit, lsr #2 | |
888e552f | 221 | cmp dividend, divisor, lsr #3 |
02689e18 NC |
222 | subhs dividend, dividend, divisor, lsr #3 |
223 | orrhs result, result, curbit, lsr #3 | |
888e552f | 224 | .endif |
454e0249 | 225 | |
888e552f | 226 | cmp dividend, #0 @ Early termination? |
02689e18 NC |
227 | movnes curbit, curbit, lsr #4 @ No, any more bits to do? |
228 | movne divisor, divisor, lsr #4 | |
215e4ee7 | 229 | bne Loop3 |
454e0249 | 230 | |
888e552f NC |
231 | .if \modulo |
232 | Lfixup_dividend: | |
233 | @ Any subtractions that we should not have done will be recorded in | |
234 | @ the top three bits of OVERDONE. Exactly which were not needed | |
235 | @ are governed by the position of the bit, stored in IP. | |
236 | ands overdone, overdone, #0xe0000000 | |
237 | @ If we terminated early, because dividend became zero, then the | |
238 | @ bit in ip will not be in the bottom nibble, and we should not | |
239 | @ perform the additions below. We must test for this though | |
240 | @ (rather relying upon the TSTs to prevent the additions) since | |
241 | @ the bit in ip could be in the top two bits which might then match | |
242 | @ with one of the smaller RORs. | |
02689e18 NC |
243 | tstne ip, #0x7 |
244 | beq Lgot_result | |
888e552f | 245 | tst overdone, ip, ror #3 |
02689e18 | 246 | addne dividend, dividend, divisor, lsr #3 |
888e552f | 247 | tst overdone, ip, ror #2 |
02689e18 | 248 | addne dividend, dividend, divisor, lsr #2 |
888e552f | 249 | tst overdone, ip, ror #1 |
02689e18 | 250 | addne dividend, dividend, divisor, lsr #1 |
888e552f | 251 | .endif |
b355a481 | 252 | |
888e552f NC |
253 | Lgot_result: |
254 | .endm | |
6dcd26ea | 255 | /* ------------------------------------------------------------------------ */ |
888e552f NC |
256 | .macro THUMB_DIV_MOD_BODY modulo |
257 | @ Load the constant 0x10000000 into our work register. | |
d5b7b3ae RE |
258 | mov work, #1 |
259 | lsl work, #28 | |
260 | Loop1: | |
261 | @ Unless the divisor is very big, shift it up in multiples of | |
262 | @ four bits, since this is the amount of unwinding in the main | |
263 | @ division loop. Continue shifting until the divisor is | |
264 | @ larger than the dividend. | |
265 | cmp divisor, work | |
02689e18 | 266 | bhs Lbignum |
d5b7b3ae | 267 | cmp divisor, dividend |
02689e18 | 268 | bhs Lbignum |
d5b7b3ae | 269 | lsl divisor, #4 |
888e552f | 270 | lsl curbit, #4 |
d5b7b3ae RE |
271 | b Loop1 |
272 | Lbignum: | |
273 | @ Set work to 0x80000000 | |
274 | lsl work, #3 | |
275 | Loop2: | |
276 | @ For very big divisors, we must shift it a bit at a time, or | |
277 | @ we will be in danger of overflowing. | |
278 | cmp divisor, work | |
02689e18 | 279 | bhs Loop3 |
d5b7b3ae | 280 | cmp divisor, dividend |
02689e18 | 281 | bhs Loop3 |
d5b7b3ae | 282 | lsl divisor, #1 |
888e552f | 283 | lsl curbit, #1 |
d5b7b3ae RE |
284 | b Loop2 |
285 | Loop3: | |
888e552f NC |
286 | @ Test for possible subtractions ... |
287 | .if \modulo | |
288 | @ ... On the final pass, this may subtract too much from the dividend, | |
289 | @ so keep track of which subtractions are done, we can fix them up | |
290 | @ afterwards. | |
d5b7b3ae RE |
291 | mov overdone, #0 |
292 | cmp dividend, divisor | |
02689e18 | 293 | blo Lover1 |
d5b7b3ae | 294 | sub dividend, dividend, divisor |
888e552f | 295 | Lover1: |
d5b7b3ae RE |
296 | lsr work, divisor, #1 |
297 | cmp dividend, work | |
02689e18 | 298 | blo Lover2 |
d5b7b3ae RE |
299 | sub dividend, dividend, work |
300 | mov ip, curbit | |
301 | mov work, #1 | |
302 | ror curbit, work | |
303 | orr overdone, curbit | |
304 | mov curbit, ip | |
888e552f | 305 | Lover2: |
d5b7b3ae RE |
306 | lsr work, divisor, #2 |
307 | cmp dividend, work | |
02689e18 | 308 | blo Lover3 |
d5b7b3ae RE |
309 | sub dividend, dividend, work |
310 | mov ip, curbit | |
311 | mov work, #2 | |
312 | ror curbit, work | |
313 | orr overdone, curbit | |
314 | mov curbit, ip | |
888e552f | 315 | Lover3: |
d5b7b3ae RE |
316 | lsr work, divisor, #3 |
317 | cmp dividend, work | |
02689e18 | 318 | blo Lover4 |
d5b7b3ae RE |
319 | sub dividend, dividend, work |
320 | mov ip, curbit | |
321 | mov work, #3 | |
322 | ror curbit, work | |
323 | orr overdone, curbit | |
324 | mov curbit, ip | |
888e552f | 325 | Lover4: |
d5b7b3ae | 326 | mov ip, curbit |
888e552f NC |
327 | .else |
328 | @ ... and note which bits are done in the result. On the final pass, | |
329 | @ this may subtract too much from the dividend, but the result will be ok, | |
330 | @ since the "bit" will have been shifted out at the bottom. | |
331 | cmp dividend, divisor | |
02689e18 | 332 | blo Lover1 |
888e552f NC |
333 | sub dividend, dividend, divisor |
334 | orr result, result, curbit | |
335 | Lover1: | |
336 | lsr work, divisor, #1 | |
337 | cmp dividend, work | |
02689e18 | 338 | blo Lover2 |
888e552f NC |
339 | sub dividend, dividend, work |
340 | lsr work, curbit, #1 | |
341 | orr result, work | |
342 | Lover2: | |
343 | lsr work, divisor, #2 | |
344 | cmp dividend, work | |
02689e18 | 345 | blo Lover3 |
888e552f NC |
346 | sub dividend, dividend, work |
347 | lsr work, curbit, #2 | |
348 | orr result, work | |
349 | Lover3: | |
350 | lsr work, divisor, #3 | |
351 | cmp dividend, work | |
02689e18 | 352 | blo Lover4 |
888e552f NC |
353 | sub dividend, dividend, work |
354 | lsr work, curbit, #3 | |
355 | orr result, work | |
356 | Lover4: | |
357 | .endif | |
358 | ||
d5b7b3ae | 359 | cmp dividend, #0 @ Early termination? |
02689e18 | 360 | beq Lover5 |
888e552f | 361 | lsr curbit, #4 @ No, any more bits to do? |
02689e18 | 362 | beq Lover5 |
d5b7b3ae RE |
363 | lsr divisor, #4 |
364 | b Loop3 | |
888e552f NC |
365 | Lover5: |
366 | .if \modulo | |
d5b7b3ae RE |
367 | @ Any subtractions that we should not have done will be recorded in |
368 | @ the top three bits of "overdone". Exactly which were not needed | |
369 | @ are governed by the position of the bit, stored in ip. | |
d5b7b3ae | 370 | mov work, #0xe |
888e552f | 371 | lsl work, #28 |
d5b7b3ae | 372 | and overdone, work |
02689e18 | 373 | beq Lgot_result |
7405dc37 NC |
374 | |
375 | @ If we terminated early, because dividend became zero, then the | |
376 | @ bit in ip will not be in the bottom nibble, and we should not | |
377 | @ perform the additions below. We must test for this though | |
378 | @ (rather relying upon the TSTs to prevent the additions) since | |
379 | @ the bit in ip could be in the top two bits which might then match | |
380 | @ with one of the smaller RORs. | |
381 | mov curbit, ip | |
382 | mov work, #0x7 | |
383 | tst curbit, work | |
02689e18 | 384 | beq Lgot_result |
7405dc37 | 385 | |
d5b7b3ae RE |
386 | mov curbit, ip |
387 | mov work, #3 | |
388 | ror curbit, work | |
389 | tst overdone, curbit | |
02689e18 | 390 | beq Lover6 |
d5b7b3ae | 391 | lsr work, divisor, #3 |
888e552f NC |
392 | add dividend, work |
393 | Lover6: | |
d5b7b3ae RE |
394 | mov curbit, ip |
395 | mov work, #2 | |
396 | ror curbit, work | |
397 | tst overdone, curbit | |
02689e18 | 398 | beq Lover7 |
d5b7b3ae | 399 | lsr work, divisor, #2 |
888e552f NC |
400 | add dividend, work |
401 | Lover7: | |
d5b7b3ae RE |
402 | mov curbit, ip |
403 | mov work, #1 | |
404 | ror curbit, work | |
405 | tst overdone, curbit | |
02689e18 | 406 | beq Lgot_result |
d5b7b3ae | 407 | lsr work, divisor, #1 |
888e552f NC |
408 | add dividend, work |
409 | .endif | |
410 | Lgot_result: | |
411 | .endm | |
412 | /* ------------------------------------------------------------------------ */ | |
413 | /* Start of the Real Functions */ | |
414 | /* ------------------------------------------------------------------------ */ | |
415 | #ifdef L_udivsi3 | |
416 | ||
417 | FUNC_START udivsi3 | |
418 | ||
419 | #ifdef __thumb__ | |
420 | ||
421 | cmp divisor, #0 | |
02689e18 | 422 | beq Ldiv0 |
888e552f NC |
423 | mov curbit, #1 |
424 | mov result, #0 | |
425 | ||
426 | push { work } | |
427 | cmp dividend, divisor | |
02689e18 | 428 | blo Lgot_result |
888e552f NC |
429 | |
430 | THUMB_DIV_MOD_BODY 0 | |
431 | ||
432 | mov r0, result | |
d5b7b3ae | 433 | pop { work } |
ef42b1dd | 434 | RET |
888e552f NC |
435 | |
436 | #else /* ARM version. */ | |
d5b7b3ae RE |
437 | |
438 | cmp divisor, #0 | |
02689e18 | 439 | beq Ldiv0 |
d5b7b3ae | 440 | mov curbit, #1 |
888e552f | 441 | mov result, #0 |
d5b7b3ae | 442 | cmp dividend, divisor |
02689e18 | 443 | blo Lgot_result |
888e552f NC |
444 | |
445 | ARM_DIV_MOD_BODY 0 | |
446 | ||
447 | mov r0, result | |
448 | RET | |
bd28bf5a | 449 | |
888e552f | 450 | #endif /* ARM version */ |
bd28bf5a | 451 | |
888e552f NC |
452 | FUNC_END udivsi3 |
453 | ||
454 | #endif /* L_udivsi3 */ | |
455 | /* ------------------------------------------------------------------------ */ | |
456 | #ifdef L_umodsi3 | |
457 | ||
458 | FUNC_START umodsi3 | |
459 | ||
460 | #ifdef __thumb__ | |
461 | ||
462 | cmp divisor, #0 | |
02689e18 | 463 | beq Ldiv0 |
888e552f | 464 | mov curbit, #1 |
bd28bf5a | 465 | cmp dividend, divisor |
02689e18 | 466 | bhs Lover10 |
888e552f | 467 | RET |
bd28bf5a | 468 | |
888e552f NC |
469 | Lover10: |
470 | push { work } | |
471 | ||
472 | THUMB_DIV_MOD_BODY 1 | |
473 | ||
474 | pop { work } | |
475 | RET | |
476 | ||
477 | #else /* ARM version. */ | |
478 | ||
479 | cmp divisor, #0 | |
02689e18 | 480 | beq Ldiv0 |
888e552f | 481 | cmp divisor, #1 |
02689e18 NC |
482 | cmpne dividend, divisor |
483 | moveq dividend, #0 | |
484 | RETc(lo) | |
888e552f NC |
485 | mov curbit, #1 |
486 | ||
487 | ARM_DIV_MOD_BODY 1 | |
488 | ||
d5b7b3ae | 489 | RET |
454e0249 | 490 | |
7405dc37 | 491 | #endif /* ARM version. */ |
d5b7b3ae | 492 | |
6dcd26ea | 493 | FUNC_END umodsi3 |
b355a481 | 494 | |
bd28bf5a | 495 | #endif /* L_umodsi3 */ |
6dcd26ea | 496 | /* ------------------------------------------------------------------------ */ |
bd28bf5a | 497 | #ifdef L_divsi3 |
454e0249 | 498 | |
6dcd26ea | 499 | FUNC_START divsi3 |
d5b7b3ae RE |
500 | |
501 | #ifdef __thumb__ | |
502 | cmp divisor, #0 | |
02689e18 | 503 | beq Ldiv0 |
b355a481 | 504 | |
d5b7b3ae RE |
505 | push { work } |
506 | mov work, dividend | |
507 | eor work, divisor @ Save the sign of the result. | |
508 | mov ip, work | |
509 | mov curbit, #1 | |
510 | mov result, #0 | |
511 | cmp divisor, #0 | |
02689e18 | 512 | bpl Lover10 |
d5b7b3ae | 513 | neg divisor, divisor @ Loops below use unsigned. |
888e552f | 514 | Lover10: |
d5b7b3ae | 515 | cmp dividend, #0 |
02689e18 | 516 | bpl Lover11 |
d5b7b3ae | 517 | neg dividend, dividend |
888e552f | 518 | Lover11: |
d5b7b3ae | 519 | cmp dividend, divisor |
02689e18 | 520 | blo Lgot_result |
d5b7b3ae | 521 | |
888e552f | 522 | THUMB_DIV_MOD_BODY 0 |
d5b7b3ae | 523 | |
d5b7b3ae RE |
524 | mov r0, result |
525 | mov work, ip | |
526 | cmp work, #0 | |
02689e18 | 527 | bpl Lover12 |
d5b7b3ae | 528 | neg r0, r0 |
888e552f | 529 | Lover12: |
d5b7b3ae | 530 | pop { work } |
888e552f | 531 | RET |
454e0249 | 532 | |
6dcd26ea | 533 | #else /* ARM version. */ |
d5b7b3ae | 534 | |
bd28bf5a RE |
535 | eor ip, dividend, divisor @ Save the sign of the result. |
536 | mov curbit, #1 | |
537 | mov result, #0 | |
538 | cmp divisor, #0 | |
02689e18 NC |
539 | rsbmi divisor, divisor, #0 @ Loops below use unsigned. |
540 | beq Ldiv0 | |
bd28bf5a | 541 | cmp dividend, #0 |
02689e18 | 542 | rsbmi dividend, dividend, #0 |
bd28bf5a | 543 | cmp dividend, divisor |
02689e18 | 544 | blo Lgot_result |
bd28bf5a | 545 | |
888e552f NC |
546 | ARM_DIV_MOD_BODY 0 |
547 | ||
bd28bf5a RE |
548 | mov r0, result |
549 | cmp ip, #0 | |
02689e18 | 550 | rsbmi r0, r0, #0 |
d5b7b3ae | 551 | RET |
454e0249 | 552 | |
6dcd26ea | 553 | #endif /* ARM version */ |
d5b7b3ae | 554 | |
6dcd26ea | 555 | FUNC_END divsi3 |
b355a481 | 556 | |
bd28bf5a | 557 | #endif /* L_divsi3 */ |
6dcd26ea | 558 | /* ------------------------------------------------------------------------ */ |
454e0249 DE |
559 | #ifdef L_modsi3 |
560 | ||
6dcd26ea | 561 | FUNC_START modsi3 |
d5b7b3ae RE |
562 | |
563 | #ifdef __thumb__ | |
454e0249 | 564 | |
d5b7b3ae RE |
565 | mov curbit, #1 |
566 | cmp divisor, #0 | |
02689e18 NC |
567 | beq Ldiv0 |
568 | bpl Lover10 | |
d5b7b3ae | 569 | neg divisor, divisor @ Loops below use unsigned. |
888e552f | 570 | Lover10: |
d5b7b3ae RE |
571 | push { work } |
572 | @ Need to save the sign of the dividend, unfortunately, we need | |
888e552f | 573 | @ work later on. Must do this after saving the original value of |
d5b7b3ae RE |
574 | @ the work register, because we will pop this value off first. |
575 | push { dividend } | |
576 | cmp dividend, #0 | |
02689e18 | 577 | bpl Lover11 |
d5b7b3ae | 578 | neg dividend, dividend |
888e552f | 579 | Lover11: |
d5b7b3ae | 580 | cmp dividend, divisor |
02689e18 | 581 | blo Lgot_result |
d5b7b3ae | 582 | |
888e552f NC |
583 | THUMB_DIV_MOD_BODY 1 |
584 | ||
d5b7b3ae RE |
585 | pop { work } |
586 | cmp work, #0 | |
02689e18 | 587 | bpl Lover12 |
d5b7b3ae | 588 | neg dividend, dividend |
888e552f | 589 | Lover12: |
d5b7b3ae RE |
590 | pop { work } |
591 | RET | |
7405dc37 | 592 | |
6dcd26ea | 593 | #else /* ARM version. */ |
d5b7b3ae | 594 | |
bd28bf5a | 595 | cmp divisor, #0 |
02689e18 NC |
596 | rsbmi divisor, divisor, #0 @ Loops below use unsigned. |
597 | beq Ldiv0 | |
bd28bf5a RE |
598 | @ Need to save the sign of the dividend, unfortunately, we need |
599 | @ ip later on; this is faster than pushing lr and using that. | |
600 | str dividend, [sp, #-4]! | |
888e552f | 601 | cmp dividend, #0 @ Test dividend against zero |
02689e18 | 602 | rsbmi dividend, dividend, #0 @ If negative make positive |
888e552f | 603 | cmp dividend, divisor @ else if zero return zero |
02689e18 | 604 | blo Lgot_result @ if smaller return dividend |
888e552f | 605 | mov curbit, #1 |
bd28bf5a | 606 | |
888e552f | 607 | ARM_DIV_MOD_BODY 1 |
bd28bf5a | 608 | |
bd28bf5a RE |
609 | ldr ip, [sp], #4 |
610 | cmp ip, #0 | |
02689e18 | 611 | rsbmi dividend, dividend, #0 |
d5b7b3ae | 612 | RET |
7405dc37 | 613 | |
6dcd26ea RE |
614 | #endif /* ARM version */ |
615 | ||
616 | FUNC_END modsi3 | |
b355a481 | 617 | |
454e0249 | 618 | #endif /* L_modsi3 */ |
6dcd26ea | 619 | /* ------------------------------------------------------------------------ */ |
2ecc7cad | 620 | #ifdef L_dvmd_tls |
454e0249 | 621 | |
7405dc37 | 622 | FUNC_START div0 |
454e0249 | 623 | |
7405dc37 | 624 | RET |
d5b7b3ae | 625 | |
6dcd26ea | 626 | SIZE (__div0) |
b355a481 | 627 | |
454e0249 | 628 | #endif /* L_divmodsi_tools */ |
6dcd26ea | 629 | /* ------------------------------------------------------------------------ */ |
75d3a15b NC |
630 | #ifdef L_dvmd_lnx |
631 | @ GNU/Linux division-by zero handler. Used in place of L_dvmd_tls | |
632 | ||
633 | #include <asm/unistd.h> | |
b355a481 | 634 | |
75d3a15b NC |
635 | #define SIGFPE 8 @ cant use <asm/signal.h> as it |
636 | @ contains too much C rubbish | |
7405dc37 | 637 | FUNC_START div0 |
d5b7b3ae | 638 | |
75d3a15b NC |
639 | stmfd sp!, {r1, lr} |
640 | swi __NR_getpid | |
641 | cmn r0, #1000 | |
b355a481 | 642 | ldmhsfd sp!, {r1, pc}RETCOND @ not much we can do |
75d3a15b NC |
643 | mov r1, #SIGFPE |
644 | swi __NR_kill | |
6dcd26ea RE |
645 | #ifdef __THUMB_INTERWORK__ |
646 | ldmfd sp!, {r1, lr} | |
647 | bx lr | |
648 | #else | |
75d3a15b | 649 | ldmfd sp!, {r1, pc}RETCOND |
6dcd26ea | 650 | #endif |
7405dc37 | 651 | |
6dcd26ea | 652 | SIZE (__div0) |
b355a481 | 653 | |
75d3a15b | 654 | #endif /* L_dvmd_lnx */ |
6dcd26ea | 655 | /* ------------------------------------------------------------------------ */ |
75d3a15b NC |
656 | /* These next two sections are here despite the fact that they contain Thumb |
657 | assembler because their presence allows interworked code to be linked even | |
658 | when the GCC library is this one. */ | |
659 | ||
c84df4c5 NC |
660 | /* Do not build the interworking functions when the target architecture does |
661 | not support Thumb instructions. (This can be a multilib option). */ | |
662 | #if defined L_call_via_rX && (defined __ARM_ARCH_4T__ || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__) | |
75d3a15b NC |
663 | |
664 | /* These labels & instructions are used by the Arm/Thumb interworking code. | |
665 | The address of function to be called is loaded into a register and then | |
666 | one of these labels is called via a BL instruction. This puts the | |
667 | return address into the link register with the bottom bit set, and the | |
668 | code here switches to the correct mode before executing the function. */ | |
669 | ||
670 | .text | |
671 | .align 0 | |
ec8aac6f | 672 | .force_thumb |
7405dc37 | 673 | |
75d3a15b | 674 | .macro call_via register |
6dcd26ea RE |
675 | THUMB_FUNC_START _call_via_\register |
676 | ||
75d3a15b NC |
677 | bx \register |
678 | nop | |
2a5307b1 NC |
679 | |
680 | SIZE (_call_via_\register) | |
75d3a15b NC |
681 | .endm |
682 | ||
683 | call_via r0 | |
684 | call_via r1 | |
685 | call_via r2 | |
686 | call_via r3 | |
687 | call_via r4 | |
688 | call_via r5 | |
689 | call_via r6 | |
690 | call_via r7 | |
691 | call_via r8 | |
692 | call_via r9 | |
693 | call_via sl | |
694 | call_via fp | |
695 | call_via ip | |
696 | call_via sp | |
697 | call_via lr | |
698 | ||
699 | #endif /* L_call_via_rX */ | |
6dcd26ea | 700 | /* ------------------------------------------------------------------------ */ |
c84df4c5 NC |
701 | /* Do not build the interworking functions when the target architecture does |
702 | not support Thumb instructions. (This can be a multilib option). */ | |
703 | #if defined L_interwork_call_via_rX && (defined __ARM_ARCH_4T__ || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__) | |
7405dc37 | 704 | |
75d3a15b NC |
705 | /* These labels & instructions are used by the Arm/Thumb interworking code, |
706 | when the target address is in an unknown instruction set. The address | |
707 | of function to be called is loaded into a register and then one of these | |
708 | labels is called via a BL instruction. This puts the return address | |
709 | into the link register with the bottom bit set, and the code here | |
710 | switches to the correct mode before executing the function. Unfortunately | |
711 | the target code cannot be relied upon to return via a BX instruction, so | |
712 | instead we have to store the resturn address on the stack and allow the | |
713 | called function to return here instead. Upon return we recover the real | |
714 | return address and use a BX to get back to Thumb mode. */ | |
715 | ||
716 | .text | |
717 | .align 0 | |
718 | ||
719 | .code 32 | |
2a5307b1 | 720 | .globl _arm_return |
75d3a15b NC |
721 | _arm_return: |
722 | ldmia r13!, {r12} | |
723 | bx r12 | |
724 | .code 16 | |
725 | ||
726 | .macro interwork register | |
727 | .code 16 | |
6dcd26ea RE |
728 | |
729 | THUMB_FUNC_START _interwork_call_via_\register | |
730 | ||
75d3a15b NC |
731 | bx pc |
732 | nop | |
733 | ||
734 | .code 32 | |
735 | .globl .Lchange_\register | |
736 | .Lchange_\register: | |
737 | tst \register, #1 | |
738 | stmeqdb r13!, {lr} | |
739 | adreq lr, _arm_return | |
740 | bx \register | |
2a5307b1 NC |
741 | |
742 | SIZE (_interwork_call_via_\register) | |
75d3a15b NC |
743 | .endm |
744 | ||
745 | interwork r0 | |
746 | interwork r1 | |
747 | interwork r2 | |
748 | interwork r3 | |
749 | interwork r4 | |
750 | interwork r5 | |
751 | interwork r6 | |
752 | interwork r7 | |
753 | interwork r8 | |
754 | interwork r9 | |
755 | interwork sl | |
756 | interwork fp | |
757 | interwork ip | |
758 | interwork sp | |
2a5307b1 | 759 | |
6dcd26ea | 760 | /* The LR case has to be handled a little differently... */ |
2a5307b1 | 761 | .code 16 |
6dcd26ea RE |
762 | |
763 | THUMB_FUNC_START _interwork_call_via_lr | |
764 | ||
2a5307b1 NC |
765 | bx pc |
766 | nop | |
767 | ||
768 | .code 32 | |
769 | .globl .Lchange_lr | |
770 | .Lchange_lr: | |
771 | tst lr, #1 | |
772 | stmeqdb r13!, {lr} | |
773 | mov ip, lr | |
774 | adreq lr, _arm_return | |
775 | bx ip | |
776 | ||
777 | SIZE (_interwork_call_via_lr) | |
778 | ||
75d3a15b | 779 | #endif /* L_interwork_call_via_rX */ |