1 /* $NetBSD: context.S,v 1.9 2023/10/06 11:45:16 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Marcel Moolenaar 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD: releng/10.1/sys/ia64/ia64/context.S 204184 2010-02-22 01:23:41Z marcel $ 29 */ 30 31 #include <machine/asm.h> 32 #include "assym.h" 33 34 .text 35 36 /* 37 * void restorectx(struct pcb *) 38 */ 39 ENTRY(restorectx, 1) 40 { .mmi 41 invala 42 mov ar.rsc=0 43 add r31=8,r32 44 ;; 45 } 46 { .mmi 47 ld8 r12=[r32] // sp 48 ld8 r16=[r31],16 // unat (before) 49 add r30=16,r32 50 ;; 51 } 52 { .mmi 53 ld8 r17=[r30],16 // rp 54 ld8 r18=[r31],16 // pr 55 add r14=SIZEOF_SPECIAL,r32 56 ;; 57 } 58 { .mmi 59 ld8 r19=[r30],16 // pfs 60 ld8 r20=[r31],16 // bspstore 61 mov rp=r17 62 ;; 63 } 64 { .mmi 65 loadrs 66 ld8 r21=[r30],16 // rnat 67 mov pr=r18,0x1fffe 68 ;; 69 } 70 { .mmi 71 ld8 r17=[r14],8 // unat (after) 72 mov ar.bspstore=r20 73 mov ar.pfs=r19 74 ;; 75 } 76 { .mmi 77 mov ar.unat=r17 78 mov ar.rnat=r21 79 add r15=8,r14 80 ;; 81 } 82 { .mmi 83 ld8.fill r4=[r14],16 // r4 84 ld8.fill r5=[r15],16 // r5 85 nop 0 86 ;; 87 } 88 { .mmi 89 ld8.fill r6=[r14],16 // r6 90 ld8.fill r7=[r15],16 // r7 91 nop 0 92 ;; 93 } 94 { .mmi 95 mov ar.unat=r16 96 mov ar.rsc=3 97 nop 0 98 } 99 { .mmi 100 ld8 r17=[r14],16 // b1 101 ld8 r18=[r15],16 // b2 102 nop 0 103 ;; 104 } 105 { .mmi 106 ld8 r19=[r14],16 // b3 107 ld8 r20=[r15],16 // b4 108 mov b1=r17 109 ;; 110 } 111 { .mmi 112 ld8 r16=[r14],24 // b5 113 ld8 r17=[r15],32 // lc 114 mov b2=r18 115 ;; 116 } 117 { .mmi 118 ldf.fill f2=[r14],32 119 ldf.fill f3=[r15],32 120 mov b3=r19 121 ;; 122 } 123 { .mmi 124 ldf.fill f4=[r14],32 125 ldf.fill f5=[r15],32 126 mov b4=r20 127 ;; 128 } 129 { .mmi 130 ldf.fill f16=[r14],32 131 ldf.fill f17=[r15],32 132 mov b5=r16 133 ;; 134 } 135 { .mmi 136 ldf.fill f18=[r14],32 137 ldf.fill f19=[r15],32 138 mov ar.lc=r17 139 ;; 140 } 141 ldf.fill f20=[r14],32 142 ldf.fill f21=[r15],32 143 ;; 144 ldf.fill f22=[r14],32 145 ldf.fill f23=[r15],32 146 ;; 147 ldf.fill f24=[r14],32 148 ldf.fill f25=[r15],32 149 ;; 150 ldf.fill f26=[r14],32 151 ldf.fill f27=[r15],32 152 ;; 153 { .mmi 154 ldf.fill f28=[r14],32 155 ldf.fill f29=[r15],32 156 add r8=1,r0 157 ;; 158 } 159 { .mmb 160 ldf.fill f30=[r14] 161 ldf.fill f31=[r15] 162 br.ret.sptk rp 163 ;; 164 } 165 END(restorectx) 166 167 /* 168 * void swapctx(struct pcb *old, struct pcb *new) 169 */ 170 171 ENTRY(swapctx, 2) 172 { .mmi 173 mov ar.rsc=0 174 mov r16=ar.unat 175 add r31=8,r32 176 ;; 177 } 178 { .mmi 179 flushrs 180 st8 [r32]=sp,16 // sp 181 mov r17=rp 182 ;; 183 } 184 { .mmi 185 st8 [r31]=r16,16 // unat (before) 186 st8 [r32]=r17,16 // rp 187 mov r16=pr 188 ;; 189 } 190 { .mmi 191 st8 [r31]=r16,16 // pr 192 mov r17=ar.bsp 193 mov r16=ar.pfs 194 ;; 195 } 196 { .mmi 197 st8 [r32]=r16,16 // pfs 198 st8 [r31]=r17,16 // bspstore 199 cmp.eq p15,p0=0,r33 200 ;; 201 } 202 { .mmi 203 mov r16=ar.rnat 204 (p15) mov ar.rsc=3 205 add r30=SIZEOF_SPECIAL-(6*8),r32 206 ;; 207 } 208 { .mmi 209 st8 [r32]=r16,SIZEOF_SPECIAL-(4*8) // rnat 210 st8 [r31]=r0,SIZEOF_SPECIAL-(6*8) // __spare 211 mov r16=b1 212 ;; 213 } 214 /* callee_saved */ 215 { .mmi 216 .mem.offset 8,0 217 st8.spill [r31]=r4,16 // r4 218 .mem.offset 16,0 219 st8.spill [r32]=r5,16 // r5 220 mov r17=b2 221 ;; 222 } 223 { .mmi 224 .mem.offset 24,0 225 st8.spill [r31]=r6,16 // r6 226 .mem.offset 32,0 227 st8.spill [r32]=r7,16 // r7 228 mov r18=b3 229 ;; 230 } 231 { .mmi 232 st8 [r31]=r16,16 // b1 233 mov r16=ar.unat 234 mov r19=b4 235 ;; 236 } 237 { .mmi 238 st8 [r30]=r16 // unat (after) 239 st8 [r32]=r17,16 // b2 240 mov r16=b5 241 ;; 242 } 243 { .mmi 244 st8 [r31]=r18,16 // b3 245 st8 [r32]=r19,16 // b4 246 mov r17=ar.lc 247 ;; 248 } 249 st8 [r31]=r16,16 // b5 250 st8 [r32]=r17,16 // lc 251 ;; 252 st8 [r31]=r0,24 // __spare 253 stf.spill [r32]=f2,32 254 ;; 255 stf.spill [r31]=f3,32 256 stf.spill [r32]=f4,32 257 ;; 258 stf.spill [r31]=f5,32 259 stf.spill [r32]=f16,32 260 ;; 261 stf.spill [r31]=f17,32 262 stf.spill [r32]=f18,32 263 ;; 264 stf.spill [r31]=f19,32 265 stf.spill [r32]=f20,32 266 ;; 267 stf.spill [r31]=f21,32 268 stf.spill [r32]=f22,32 269 ;; 270 stf.spill [r31]=f23,32 271 stf.spill [r32]=f24,32 272 ;; 273 stf.spill [r31]=f25,32 274 stf.spill [r32]=f26,32 275 ;; 276 stf.spill [r31]=f27,32 277 stf.spill [r32]=f28,32 278 ;; 279 { .mmi 280 stf.spill [r31]=f29,32 281 stf.spill [r32]=f30 282 (p15) add r8=0,r0 283 ;; 284 } 285 { .mmb 286 stf.spill [r31]=f31 287 mf 288 (p15) br.ret.sptk rp 289 ;; 290 } 291 { .mib 292 mov r32=r33 293 nop 0 294 br.sptk restorectx 295 ;; 296 } 297 END(swapctx) 298 299 /* 300 * save_callee_saved(struct _callee_saved *) 301 */ 302 ENTRY(save_callee_saved, 1) 303 { .mii 304 nop 0 305 add r14=8,r32 306 add r15=16,r32 307 ;; 308 } 309 { .mmi 310 .mem.offset 8,0 311 st8.spill [r14]=r4,16 // r4 312 .mem.offset 16,0 313 st8.spill [r15]=r5,16 // r5 314 mov r16=b1 315 ;; 316 } 317 { .mmi 318 .mem.offset 24,0 319 st8.spill [r14]=r6,16 // r6 320 .mem.offset 32,0 321 st8.spill [r15]=r7,16 // r7 322 mov r17=b2 323 ;; 324 } 325 { .mmi 326 st8 [r14]=r16,16 // b1 327 mov r18=ar.unat 328 mov r19=b3 329 ;; 330 } 331 { .mmi 332 st8 [r32]=r18 // nat (after) 333 st8 [r15]=r17,16 // b2 334 mov r16=b4 335 ;; 336 } 337 { .mmi 338 st8 [r14]=r19,16 // b3 339 st8 [r15]=r16,16 // b4 340 mov r17=b5 341 ;; 342 } 343 { .mii 344 st8 [r14]=r17,16 // b5 345 mov r16=ar.lc 346 nop 0 347 ;; 348 } 349 { .mmb 350 st8 [r15]=r16 // ar.lc 351 st8 [r14]=r0 // __spare 352 br.ret.sptk rp 353 ;; 354 } 355 END(save_callee_saved) 356 357 /* 358 * restore_callee_saved(struct _callee_saved *) 359 */ 360 ENTRY(restore_callee_saved, 1) 361 { .mmi 362 ld8 r30=[r32],16 // nat (after) 363 ;; 364 mov ar.unat=r30 365 add r31=-8,r32 366 ;; 367 } 368 { .mmi 369 ld8.fill r4=[r31],16 // r4 370 ld8.fill r5=[r32],16 // r5 371 nop 0 372 ;; 373 } 374 { .mmi 375 ld8.fill r6=[r31],16 // r6 376 ld8.fill r7=[r32],16 // r7 377 nop 0 378 ;; 379 } 380 { .mmi 381 ld8 r30=[r31],16 // b1 382 ld8 r29=[r32],16 // b2 383 nop 0 384 ;; 385 } 386 { .mmi 387 ld8 r28=[r31],16 // b3 388 ld8 r27=[r32],16 // b4 389 mov b1=r30 390 ;; 391 } 392 { .mii 393 ld8 r26=[r31] // b5 394 mov b2=r29 395 mov b3=r28 396 ;; 397 } 398 { .mii 399 ld8 r25=[r32] // lc 400 mov b4=r27 401 mov b5=r26 402 ;; 403 } 404 { .mib 405 nop 0 406 mov ar.lc=r25 407 br.ret.sptk rp 408 ;; 409 } 410 END(restore_callee_saved) 411 412 /* 413 * save_callee_saved_fp(struct _callee_saved_fp *) 414 */ 415 ENTRY(save_callee_saved_fp, 1) 416 add r31=16,r32 417 stf.spill [r32]=f2,32 418 ;; 419 stf.spill [r31]=f3,32 420 stf.spill [r32]=f4,32 421 ;; 422 stf.spill [r31]=f5,32 423 stf.spill [r32]=f16,32 424 ;; 425 stf.spill [r31]=f17,32 426 stf.spill [r32]=f18,32 427 ;; 428 stf.spill [r31]=f19,32 429 stf.spill [r32]=f20,32 430 ;; 431 stf.spill [r31]=f21,32 432 stf.spill [r32]=f22,32 433 ;; 434 stf.spill [r31]=f23,32 435 stf.spill [r32]=f24,32 436 ;; 437 stf.spill [r31]=f25,32 438 stf.spill [r32]=f26,32 439 ;; 440 stf.spill [r31]=f27,32 441 stf.spill [r32]=f28,32 442 ;; 443 stf.spill [r31]=f29,32 444 stf.spill [r32]=f30 445 ;; 446 stf.spill [r31]=f31 447 br.ret.sptk rp 448 ;; 449 END(save_callee_saved_fp) 450 451 /* 452 * restore_callee_saved_fp(struct _callee_saved_fp *) 453 */ 454 ENTRY(restore_callee_saved_fp, 1) 455 add r31=16,r32 456 ldf.fill f2=[r32],32 457 ;; 458 ldf.fill f3=[r31],32 459 ldf.fill f4=[r32],32 460 ;; 461 ldf.fill f5=[r31],32 462 ldf.fill f16=[r32],32 463 ;; 464 ldf.fill f17=[r31],32 465 ldf.fill f18=[r32],32 466 ;; 467 ldf.fill f19=[r31],32 468 ldf.fill f20=[r32],32 469 ;; 470 ldf.fill f21=[r31],32 471 ldf.fill f22=[r32],32 472 ;; 473 ldf.fill f23=[r31],32 474 ldf.fill f24=[r32],32 475 ;; 476 ldf.fill f25=[r31],32 477 ldf.fill f26=[r32],32 478 ;; 479 ldf.fill f27=[r31],32 480 ldf.fill f28=[r32],32 481 ;; 482 ldf.fill f29=[r31],32 483 ldf.fill f30=[r32] 484 ;; 485 ldf.fill f31=[r31] 486 br.ret.sptk rp 487 ;; 488 END(restore_callee_saved_fp) 489 490 /* 491 * save_high_fp(struct _high_fp *) 492 */ 493 ENTRY(save_high_fp, 1) 494 rsm psr.dfh 495 ;; 496 srlz.d 497 add r31=16,r32 498 stf.spill [r32]=f32,32 499 ;; 500 stf.spill [r31]=f33,32 501 stf.spill [r32]=f34,32 502 ;; 503 stf.spill [r31]=f35,32 504 stf.spill [r32]=f36,32 505 ;; 506 stf.spill [r31]=f37,32 507 stf.spill [r32]=f38,32 508 ;; 509 stf.spill [r31]=f39,32 510 stf.spill [r32]=f40,32 511 ;; 512 stf.spill [r31]=f41,32 513 stf.spill [r32]=f42,32 514 ;; 515 stf.spill [r31]=f43,32 516 stf.spill [r32]=f44,32 517 ;; 518 stf.spill [r31]=f45,32 519 stf.spill [r32]=f46,32 520 ;; 521 stf.spill [r31]=f47,32 522 stf.spill [r32]=f48,32 523 ;; 524 stf.spill [r31]=f49,32 525 stf.spill [r32]=f50,32 526 ;; 527 stf.spill [r31]=f51,32 528 stf.spill [r32]=f52,32 529 ;; 530 stf.spill [r31]=f53,32 531 stf.spill [r32]=f54,32 532 ;; 533 stf.spill [r31]=f55,32 534 stf.spill [r32]=f56,32 535 ;; 536 stf.spill [r31]=f57,32 537 stf.spill [r32]=f58,32 538 ;; 539 stf.spill [r31]=f59,32 540 stf.spill [r32]=f60,32 541 ;; 542 stf.spill [r31]=f61,32 543 stf.spill [r32]=f62,32 544 ;; 545 stf.spill [r31]=f63,32 546 stf.spill [r32]=f64,32 547 ;; 548 stf.spill [r31]=f65,32 549 stf.spill [r32]=f66,32 550 ;; 551 stf.spill [r31]=f67,32 552 stf.spill [r32]=f68,32 553 ;; 554 stf.spill [r31]=f69,32 555 stf.spill [r32]=f70,32 556 ;; 557 stf.spill [r31]=f71,32 558 stf.spill [r32]=f72,32 559 ;; 560 stf.spill [r31]=f73,32 561 stf.spill [r32]=f74,32 562 ;; 563 stf.spill [r31]=f75,32 564 stf.spill [r32]=f76,32 565 ;; 566 stf.spill [r31]=f77,32 567 stf.spill [r32]=f78,32 568 ;; 569 stf.spill [r31]=f79,32 570 stf.spill [r32]=f80,32 571 ;; 572 stf.spill [r31]=f81,32 573 stf.spill [r32]=f82,32 574 ;; 575 stf.spill [r31]=f83,32 576 stf.spill [r32]=f84,32 577 ;; 578 stf.spill [r31]=f85,32 579 stf.spill [r32]=f86,32 580 ;; 581 stf.spill [r31]=f87,32 582 stf.spill [r32]=f88,32 583 ;; 584 stf.spill [r31]=f89,32 585 stf.spill [r32]=f90,32 586 ;; 587 stf.spill [r31]=f91,32 588 stf.spill [r32]=f92,32 589 ;; 590 stf.spill [r31]=f93,32 591 stf.spill [r32]=f94,32 592 ;; 593 stf.spill [r31]=f95,32 594 stf.spill [r32]=f96,32 595 ;; 596 stf.spill [r31]=f97,32 597 stf.spill [r32]=f98,32 598 ;; 599 stf.spill [r31]=f99,32 600 stf.spill [r32]=f100,32 601 ;; 602 stf.spill [r31]=f101,32 603 stf.spill [r32]=f102,32 604 ;; 605 stf.spill [r31]=f103,32 606 stf.spill [r32]=f104,32 607 ;; 608 stf.spill [r31]=f105,32 609 stf.spill [r32]=f106,32 610 ;; 611 stf.spill [r31]=f107,32 612 stf.spill [r32]=f108,32 613 ;; 614 stf.spill [r31]=f109,32 615 stf.spill [r32]=f110,32 616 ;; 617 stf.spill [r31]=f111,32 618 stf.spill [r32]=f112,32 619 ;; 620 stf.spill [r31]=f113,32 621 stf.spill [r32]=f114,32 622 ;; 623 stf.spill [r31]=f115,32 624 stf.spill [r32]=f116,32 625 ;; 626 stf.spill [r31]=f117,32 627 stf.spill [r32]=f118,32 628 ;; 629 stf.spill [r31]=f119,32 630 stf.spill [r32]=f120,32 631 ;; 632 stf.spill [r31]=f121,32 633 stf.spill [r32]=f122,32 634 ;; 635 stf.spill [r31]=f123,32 636 stf.spill [r32]=f124,32 637 ;; 638 stf.spill [r31]=f125,32 639 stf.spill [r32]=f126 640 ;; 641 stf.spill [r31]=f127 642 ssm psr.dfh 643 ;; 644 srlz.d 645 br.ret.sptk rp 646 ;; 647 END(save_high_fp) 648 649 /* 650 * restore_high_fp(struct _high_fp *) 651 */ 652 ENTRY(restore_high_fp, 1) 653 rsm psr.dfh 654 ;; 655 srlz.d 656 add r31=16,r32 657 ldf.fill f32=[r32],32 658 ;; 659 ldf.fill f33=[r31],32 660 ldf.fill f34=[r32],32 661 ;; 662 ldf.fill f35=[r31],32 663 ldf.fill f36=[r32],32 664 ;; 665 ldf.fill f37=[r31],32 666 ldf.fill f38=[r32],32 667 ;; 668 ldf.fill f39=[r31],32 669 ldf.fill f40=[r32],32 670 ;; 671 ldf.fill f41=[r31],32 672 ldf.fill f42=[r32],32 673 ;; 674 ldf.fill f43=[r31],32 675 ldf.fill f44=[r32],32 676 ;; 677 ldf.fill f45=[r31],32 678 ldf.fill f46=[r32],32 679 ;; 680 ldf.fill f47=[r31],32 681 ldf.fill f48=[r32],32 682 ;; 683 ldf.fill f49=[r31],32 684 ldf.fill f50=[r32],32 685 ;; 686 ldf.fill f51=[r31],32 687 ldf.fill f52=[r32],32 688 ;; 689 ldf.fill f53=[r31],32 690 ldf.fill f54=[r32],32 691 ;; 692 ldf.fill f55=[r31],32 693 ldf.fill f56=[r32],32 694 ;; 695 ldf.fill f57=[r31],32 696 ldf.fill f58=[r32],32 697 ;; 698 ldf.fill f59=[r31],32 699 ldf.fill f60=[r32],32 700 ;; 701 ldf.fill f61=[r31],32 702 ldf.fill f62=[r32],32 703 ;; 704 ldf.fill f63=[r31],32 705 ldf.fill f64=[r32],32 706 ;; 707 ldf.fill f65=[r31],32 708 ldf.fill f66=[r32],32 709 ;; 710 ldf.fill f67=[r31],32 711 ldf.fill f68=[r32],32 712 ;; 713 ldf.fill f69=[r31],32 714 ldf.fill f70=[r32],32 715 ;; 716 ldf.fill f71=[r31],32 717 ldf.fill f72=[r32],32 718 ;; 719 ldf.fill f73=[r31],32 720 ldf.fill f74=[r32],32 721 ;; 722 ldf.fill f75=[r31],32 723 ldf.fill f76=[r32],32 724 ;; 725 ldf.fill f77=[r31],32 726 ldf.fill f78=[r32],32 727 ;; 728 ldf.fill f79=[r31],32 729 ldf.fill f80=[r32],32 730 ;; 731 ldf.fill f81=[r31],32 732 ldf.fill f82=[r32],32 733 ;; 734 ldf.fill f83=[r31],32 735 ldf.fill f84=[r32],32 736 ;; 737 ldf.fill f85=[r31],32 738 ldf.fill f86=[r32],32 739 ;; 740 ldf.fill f87=[r31],32 741 ldf.fill f88=[r32],32 742 ;; 743 ldf.fill f89=[r31],32 744 ldf.fill f90=[r32],32 745 ;; 746 ldf.fill f91=[r31],32 747 ldf.fill f92=[r32],32 748 ;; 749 ldf.fill f93=[r31],32 750 ldf.fill f94=[r32],32 751 ;; 752 ldf.fill f95=[r31],32 753 ldf.fill f96=[r32],32 754 ;; 755 ldf.fill f97=[r31],32 756 ldf.fill f98=[r32],32 757 ;; 758 ldf.fill f99=[r31],32 759 ldf.fill f100=[r32],32 760 ;; 761 ldf.fill f101=[r31],32 762 ldf.fill f102=[r32],32 763 ;; 764 ldf.fill f103=[r31],32 765 ldf.fill f104=[r32],32 766 ;; 767 ldf.fill f105=[r31],32 768 ldf.fill f106=[r32],32 769 ;; 770 ldf.fill f107=[r31],32 771 ldf.fill f108=[r32],32 772 ;; 773 ldf.fill f109=[r31],32 774 ldf.fill f110=[r32],32 775 ;; 776 ldf.fill f111=[r31],32 777 ldf.fill f112=[r32],32 778 ;; 779 ldf.fill f113=[r31],32 780 ldf.fill f114=[r32],32 781 ;; 782 ldf.fill f115=[r31],32 783 ldf.fill f116=[r32],32 784 ;; 785 ldf.fill f117=[r31],32 786 ldf.fill f118=[r32],32 787 ;; 788 ldf.fill f119=[r31],32 789 ldf.fill f120=[r32],32 790 ;; 791 ldf.fill f121=[r31],32 792 ldf.fill f122=[r32],32 793 ;; 794 ldf.fill f123=[r31],32 795 ldf.fill f124=[r32],32 796 ;; 797 ldf.fill f125=[r31],32 798 ldf.fill f126=[r32] 799 ;; 800 ldf.fill f127=[r31] 801 ssm psr.dfh 802 ;; 803 srlz.d 804 br.ret.sptk rp 805 ;; 806 END(restore_high_fp) 807 808 /* 809 * lwp_trampoline() 810 * 811 * Arrange for a function to be invoked neatly, after a cpu_switchto(). 812 * 813 * Invokes fork_exit() passing in three arguments: a callout function, an 814 * argument to the callout, and a trapframe pointer. For child processes 815 * returning from fork(2), the argument is a pointer to the child process. 816 * 817 * The callout function and its argument is in the trapframe in scratch 818 * registers r2 and r3. 819 */ 820 ENTRY(lwp_trampoline, 0) 821 .prologue 822 .save rp,r0 823 824 .body 825 { .mmi 826 alloc r14=ar.pfs,0,1,2,0 827 add r2=PC_CURLWP,r13 // r2 = &ci->ci_curlwp 828 ;; 829 } 830 { .mmi 831 mov out0=ret1 // oldlwp 832 ld8 out1=[r2] // newlwp = ci->ci_curlwp 833 add loc0=32+SIZEOF_SPECIAL+8,sp // tf_scratch.gr2(func) 834 ;; 835 } 836 { .mmb 837 ld8 loc0=[loc0] 838 add r4=32+SIZEOF_SPECIAL+16,sp // tf_scratch.gr3(arg) 839 br.call.sptk rp=_C_LABEL(lwp_startup) 840 ;; 841 } 842 { .mib 843 ld8 out0=[r4] 844 mov b1=loc0 845 br.call.sptk rp=b1 846 ;; 847 } 848 /* 849 * If we get back here, it means we're a user space process that's 850 * the immediate result of fork(2). 851 */ 852 .global enter_userland 853 .type enter_userland, @function 854 enter_userland: 855 { .mfb 856 nop 0 857 nop 0 858 #if 0 859 br.sptk epc_syscall_return 860 #endif 861 ;; 862 } 863 END(lwp_trampoline) 864
Indexes created Sun Sep 21 16:09:51 GMT 2025