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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 | /* $Id: entry.S,v 1.65 1997/08/29 15:51:29 jj Exp $ * arch/sparc64/kernel/entry.S: Sparc64 trap low-level entry points. * * Copyright (C) 1995,1997 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <linux/config.h> #include <linux/errno.h> #include <asm/head.h> #include <asm/asi.h> #include <asm/smp.h> #include <asm/ptrace.h> #include <asm/page.h> #include <asm/signal.h> #include <asm/pgtable.h> #include <asm/processor.h> /* #define SYSCALL_TRACING */ #define curptr g6 #define NR_SYSCALLS 256 /* Each OS is different... */ .text .globl sparc64_dtlb_prot_catch, sparc64_dtlb_refbit_catch .globl sparc64_itlb_refbit_catch /* Note, DMMU SFAR not updated for fast tlb data access miss * traps, so we must use tag access to find the right page. * However for DMMU fast protection traps it is updated so * we use, but we must also clear it _before_ we enable interrupts * and save state because there is a race where we can push a user * window right now in etrap, a protection fault happens (for example * to update the dirty bit) and since we left crap in the sfsr * it will not get updated properly. */ .align 32 sparc64_dtlb_prot_catch: wr %g0, ASI_DMMU, %asi rdpr %pstate, %g1 wrpr %g1, PSTATE_AG|PSTATE_MG, %pstate rdpr %tl, %g3 ldxa [%g0 + TLB_TAG_ACCESS] %asi, %g5 stxa %g0, [%g0 + TLB_SFSR] %asi membar #Sync cmp %g3, 1 bgu,a,pn %icc, winfix_trampoline rdpr %tpc, %g3 sethi %hi(109f), %g7 ba,pt %xcc, etrap 109: or %g7, %lo(109b), %g7 b,pt %xcc, 1f mov 1, %o2 .align 32 sparc64_dtlb_refbit_catch: srlx %g5, 9, %g4 and %g4, ((_PAGE_PRESENT | _PAGE_READ) >> 9), %g4 cmp %g4, ((_PAGE_PRESENT | _PAGE_READ) >> 9) be,a,pt %xcc, 2f mov 1, %g4 wr %g0, ASI_DMMU, %asi rdpr %pstate, %g1 wrpr %g1, PSTATE_AG|PSTATE_MG, %pstate rdpr %tl, %g3 ldxa [%g0 + TLB_TAG_ACCESS] %asi, %g5 cmp %g3, 1 bgu,pn %icc, winfix_trampoline rdpr %tpc, %g3 sethi %hi(109f), %g7 b,pt %xcc, etrap 109: or %g7, %lo(109b), %g7 clr %o2 1: srlx %l5, PAGE_SHIFT, %o1 add %sp, STACK_BIAS + REGWIN_SZ, %o0 call do_sparc64_fault sllx %o1, PAGE_SHIFT, %o1 b,pt %xcc, rtrap clr %l6 .align 32 sparc64_itlb_refbit_catch: srlx %g5, 9, %g4 and %g4, ((_PAGE_PRESENT | _PAGE_READ) >> 9), %g4 cmp %g4, ((_PAGE_PRESENT | _PAGE_READ) >> 9) be,a,pt %xcc, 3f mov 1, %g4 rdpr %pstate, %g1 wrpr %g1, PSTATE_AG|PSTATE_MG, %pstate rdpr %tpc, %g5 sethi %hi(109f), %g7 b,pt %xcc, etrap 109: or %g7, %lo(109b), %g7 b,pt %xcc, 1b clr %o2 .align 32 2: sllx %g4, 63, %g4 ! _PAGE_VALID or %g5, _PAGE_ACCESSED, %g5 or %g5, %g4, %g5 stxa %g5, [%g3 + %g1] ASI_PHYS_USE_EC ! store new PTE stxa %g5, [%g0] ASI_DTLB_DATA_IN ! TLB load retry .align 32 3: sllx %g4, 63, %g4 ! _PAGE_VALID or %g5, _PAGE_ACCESSED, %g5 or %g5, %g4, %g5 stxa %g5, [%g3 + %g1] ASI_PHYS_USE_EC ! store new PTE stxa %g5, [%g0] ASI_ITLB_DATA_IN ! TLB load retry #define FPDIS_OFF (((PAGE_SIZE<<1)-((64*4)+(2*8))) & ~(64 - 1)) /* This is trivial with the new code... */ .align 32 .globl do_fpdis do_fpdis: ldx [%g6 + AOFF_task_tss + AOFF_thread_flags], %g5 ! Load Group sethi %hi(TSTATE_PEF), %g4 ! IEU0 sethi %hi(FPDIS_OFF), %g3 ! IEU1 wr %g0, FPRS_FEF, %fprs ! LSU Group+4bubbles andcc %g5, SPARC_FLAG_USEDFPU, %g0 ! IEU1 Group or %g3, %lo(FPDIS_OFF), %g2 ! IEU0 sethi %hi(empty_zero_page), %g1 ! IEU0 Group add %g6, %g2, %g2 ! IEU1 be,a,pn %icc, 1f ! CTI clr %g7 ! IEU0 Group add %g2, 0x100, %g1 ! IEU1 ldx [%g2 + 0x108], %g7 ! Load 1: andcc %g5, SPARC_FLAG_USEDFPUL, %g0 ! IEU1 Group bne,pn %icc, 2f ! CTI fzero %f0 ! FPA andcc %g5, SPARC_FLAG_USEDFPUU, %g0 ! IEU1 Group bne,pn %icc, 1f ! CTI fzero %f2 ! FPA faddd %f0, %f2, %f4 fmuld %f0, %f2, %f6 faddd %f0, %f2, %f8 fmuld %f0, %f2, %f10 faddd %f0, %f2, %f12 fmuld %f0, %f2, %f14 faddd %f0, %f2, %f16 fmuld %f0, %f2, %f18 faddd %f0, %f2, %f20 fmuld %f0, %f2, %f22 faddd %f0, %f2, %f24 fmuld %f0, %f2, %f26 faddd %f0, %f2, %f28 fmuld %f0, %f2, %f30 faddd %f0, %f2, %f32 fmuld %f0, %f2, %f34 faddd %f0, %f2, %f36 fmuld %f0, %f2, %f38 faddd %f0, %f2, %f40 fmuld %f0, %f2, %f42 faddd %f0, %f2, %f44 fmuld %f0, %f2, %f46 faddd %f0, %f2, %f48 fmuld %f0, %f2, %f50 faddd %f0, %f2, %f52 fmuld %f0, %f2, %f54 faddd %f0, %f2, %f56 fmuld %f0, %f2, %f58 b,pt %xcc, fpdis_exit2 faddd %f0, %f2, %f60 1: mov SECONDARY_CONTEXT, %g3 faddd %f0, %f2, %f4 fmuld %f0, %f2, %f6 ldxa [%g3] ASI_DMMU, %g5 stxa %g0, [%g3] ASI_DMMU faddd %f0, %f2, %f8 fmuld %f0, %f2, %f10 flush %g2 wr %g0, ASI_BLK_S, %asi ! grrr, where is ASI_BLK_NUCLEUS 8-( membar #StoreLoad | #LoadLoad ldda [%g2 + 0x080] %asi, %f32 ldda [%g2 + 0x0c0] %asi, %f48 faddd %f0, %f2, %f12 fmuld %f0, %f2, %f14 faddd %f0, %f2, %f16 fmuld %f0, %f2, %f18 faddd %f0, %f2, %f20 fmuld %f0, %f2, %f22 faddd %f0, %f2, %f24 fmuld %f0, %f2, %f26 faddd %f0, %f2, %f28 fmuld %f0, %f2, %f30 b,pt %xcc, fpdis_exit membar #Sync 2: andcc %g5, SPARC_FLAG_USEDFPUU, %g0 bne,pt %icc, 3f fzero %f32 mov SECONDARY_CONTEXT, %g3 fzero %f34 ldxa [%g3] ASI_DMMU, %g5 stxa %g0, [%g3] ASI_DMMU faddd %f32, %f34, %f36 fmuld %f32, %f34, %f38 flush %g2 wr %g0, ASI_BLK_S, %asi ! grrr, where is ASI_BLK_NUCLEUS 8-( membar #StoreLoad | #LoadLoad ldda [%g2 + 0x000] %asi, %f0 ldda [%g2 + 0x040] %asi, %f16 faddd %f32, %f34, %f40 fmuld %f32, %f34, %f42 faddd %f32, %f34, %f44 fmuld %f32, %f34, %f46 faddd %f32, %f34, %f48 fmuld %f32, %f34, %f50 faddd %f32, %f34, %f52 fmuld %f32, %f34, %f54 faddd %f32, %f34, %f56 fmuld %f32, %f34, %f58 faddd %f32, %f34, %f60 fmuld %f32, %f34, %f62 b,pt %xcc, fpdis_exit membar #Sync 3: mov SECONDARY_CONTEXT, %g3 ldxa [%g3] ASI_DMMU, %g5 stxa %g0, [%g3] ASI_DMMU flush %g2 wr %g0, ASI_BLK_S, %asi ! grrr, where is ASI_BLK_NUCLEUS 8-( membar #StoreLoad | #LoadLoad ldda [%g2 + 0x000] %asi, %f0 ldda [%g2 + 0x040] %asi, %f16 ldda [%g2 + 0x080] %asi, %f32 ldda [%g2 + 0x0c0] %asi, %f48 membar #Sync fpdis_exit: stxa %g5, [%g3] ASI_DMMU flush %g2 fpdis_exit2: wr %g7, 0, %gsr ldx [%g1], %fsr rdpr %tstate, %g3 or %g3, %g4, %g3 ! anal... wrpr %g3, %tstate wr %g0, FPRS_FEF, %fprs ! clean DU/DL bits retry /* The registers for cross calls will be: * * DATA 0: [low 32-bits] Address of function to call, jmp to this * [high 32-bits] MMU Context Argument 0, place in %g5 * DATA 1: Address Argument 1, place in %g6 * DATA 2: Address Argument 2, place in %g7 * * With this method we can do most of the cross-call tlb/cache * flushing very quickly. */ .data .align 8 .globl ivec_spurious_cookie ivec_spurious_cookie: .xword 0 .text .align 32 .globl do_ivec do_ivec: ldxa [%g0] ASI_INTR_RECEIVE, %g5 andcc %g5, 0x20, %g0 be,pn %xcc, do_ivec_return mov 0x40, %g2 /* Load up Interrupt Vector Data 0 register. */ sethi %hi(KERNBASE), %g4 ldxa [%g2] ASI_UDB_INTR_R, %g3 cmp %g3, %g4 bgeu,pn %xcc, do_ivec_xcall nop and %g3, 0x7ff, %g3 sllx %g3, 3, %g3 ldx [%g1 + %g3], %g2 brz,pn %g2, do_ivec_spurious sethi %hi(0x80000000), %g5 or %g2, %g5, %g2 stx %g2, [%g1 + %g3] /* No branches, worse case we don't know about this interrupt * yet, so we would just write a zero into the softint register * which is completely harmless. */ wr %g2, 0x0, %set_softint do_ivec_return: stxa %g0, [%g0] ASI_INTR_RECEIVE membar #Sync retry do_ivec_xcall: srlx %g3, 32, %g5 add %g2, 0x10, %g2 srl %g3, 0, %g3 ldxa [%g2] ASI_UDB_INTR_R, %g6 add %g2, 0x10, %g2 ldxa [%g2] ASI_UDB_INTR_R, %g7 stxa %g0, [%g0] ASI_INTR_RECEIVE jmpl %g3, %g0 membar #Sync do_ivec_spurious: srl %g3, 3, %g3 sethi %hi(ivec_spurious_cookie), %g2 stx %g3, [%g2 + %lo(ivec_spurious_cookie)] stxa %g0, [%g0] ASI_INTR_RECEIVE membar #Sync rdpr %pstate, %g5 wrpr %g5, PSTATE_IG | PSTATE_AG, %pstate sethi %hi(109f), %g7 ba,pt %xcc, etrap 109: or %g7, %lo(109b), %g7 call report_spurious_ivec add %sp, STACK_BIAS + REGWIN_SZ, %o0 ba,pt %xcc, rtrap clr %l6 .globl getcc, setcc getcc: ldx [%o0 + PT_V9_TSTATE], %o1 srlx %o1, 32, %o1 and %o1, 0xf, %o1 retl stx %o1, [%o0 + PT_V9_G1] setcc: ldx [%o0 + PT_V9_TSTATE], %o1 ldx [%o0 + PT_V9_G1], %o2 or %g0, %ulo(TSTATE_ICC), %o3 sllx %o3, 32, %o3 andn %o1, %o3, %o1 sllx %o2, 32, %o2 and %o2, %o3, %o2 or %o1, %o2, %o1 retl stx %o1, [%o0 + PT_V9_TSTATE] #ifdef CONFIG_BLK_DEV_FD .globl floppy_hardint floppy_hardint: sethi %hi(doing_pdma), %g1 ld [%g1 + %lo(doing_pdma)], %g2 brz,pn %g2, floppy_dosoftint sethi %hi(fdc_status), %g3 ldx [%g3 + %lo(fdc_status)], %g3 sethi %hi(pdma_vaddr), %g5 ldx [%g5 + %lo(pdma_vaddr)], %g4 sethi %hi(pdma_size), %g5 ldx [%g5 + %lo(pdma_size)], %g5 next_byte: ldub [%g3], %g7 andcc %g7, 0x80, %g0 be,pn %icc, floppy_fifo_emptied andcc %g7, 0x20, %g0 be,pn %icc, floppy_overrun andcc %g7, 0x40, %g0 be,pn %icc, floppy_write sub %g5, 1, %g5 ldub [%g3 + 1], %g7 orcc %g0, %g5, %g0 stb %g7, [%g4] bne,pn %xcc, next_byte add %g4, 1, %g4 b,pt %xcc, floppy_tdone nop floppy_write: ldub [%g4], %g7 orcc %g0, %g5, %g0 stb %g7, [%g3 + 1] bne,pn %xcc, next_byte add %g4, 1, %g4 floppy_tdone: sethi %hi(pdma_vaddr), %g1 stx %g4, [%g1 + %lo(pdma_vaddr)] sethi %hi(pdma_size), %g1 stx %g5, [%g1 + %lo(pdma_size)] sethi %hi(auxio_register), %g1 ldx [%g1 + %lo(auxio_register)], %g7 ldub [%g7], %g5 or %g5, 0xc2, %g5 stb %g5, [%g7] andn %g5, 0x02, %g5 nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; stb %g5, [%g7] sethi %hi(doing_pdma), %g1 b,pt %xcc, floppy_dosoftint st %g0, [%g1 + %lo(doing_pdma)] floppy_fifo_emptied: sethi %hi(pdma_vaddr), %g1 stx %g4, [%g1 + %lo(pdma_vaddr)] sethi %hi(pdma_size), %g1 stx %g5, [%g1 + %lo(pdma_size)] sethi %hi(irq_action), %g1 or %g1, %lo(irq_action), %g1 ldx [%g1 + (11 << 3)], %g3 ! irqaction[floppy_irq] ldx [%g3 + 0x10], %g4 ! action->mask st %g0, [%g4] ! SYSIO_ICLR_IDLE membar #Sync ! probably not needed... retry floppy_overrun: sethi %hi(pdma_vaddr), %g1 stx %g4, [%g1 + %lo(pdma_vaddr)] sethi %hi(pdma_size), %g1 stx %g5, [%g1 + %lo(pdma_size)] sethi %hi(doing_pdma), %g1 st %g0, [%g1 + %lo(doing_pdma)] floppy_dosoftint: rdpr %pil, %g2 wrpr %g0, 15, %pil sethi %hi(109f), %g7 b,pt %xcc, etrap_irq 109: or %g7, %lo(109b), %g7 mov 11, %o0 mov 0, %o1 call sparc_floppy_irq add %sp, STACK_BIAS + REGWIN_SZ, %o2 b,pt %xcc, rtrap clr %l6 #endif /* CONFIG_BLK_DEV_FD */ /* XXX Here is stuff we still need to write... -DaveM XXX */ .globl netbsd_syscall netbsd_syscall: retl nop .globl do_mna do_mna: rdpr %tl, %g3 cmp %g3, 1 bgu,a,pn %icc, winfix_mna rdpr %tpc, %g3 sethi %hi(109f), %g7 ba,pt %xcc, etrap 109: or %g7, %lo(109b), %g7 call mem_address_unaligned add %sp, STACK_BIAS + REGWIN_SZ, %o0 ba,pt %xcc, rtrap clr %l6 .globl breakpoint_trap breakpoint_trap: call sparc_breakpoint add %sp, STACK_BIAS + REGWIN_SZ, %o0 ba,pt %xcc, rtrap nop /* SunOS uses syscall zero as the 'indirect syscall' it looks * like indir_syscall(scall_num, arg0, arg1, arg2...); etc. * This is complete brain damage. */ .globl sunos_indir sunos_indir: srl %o0, 0, %o0 mov %o7, %l4 cmp %o0, NR_SYSCALLS blu,a,pt %icc, 1f sll %o0, 0x3, %o0 sethi %hi(sunos_nosys), %l6 b,pt %xcc, 2f or %l6, %lo(sunos_nosys), %l6 1: sethi %hi(sunos_sys_table), %l7 or %l7, %lo(sunos_sys_table), %l7 ldx [%l7 + %o0], %l6 2: mov %o1, %o0 mov %o2, %o1 mov %o3, %o2 mov %o4, %o3 mov %o5, %o4 call %l6 mov %l4, %o7 .globl sunos_getpid sunos_getpid: call sys_getppid nop call sys_getpid stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1] b,pt %xcc, ret_sys_call stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] /* SunOS getuid() returns uid in %o0 and euid in %o1 */ .globl sunos_getuid sunos_getuid: call sys_geteuid nop call sys_getuid stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1] b,pt %xcc, ret_sys_call stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] /* SunOS getgid() returns gid in %o0 and egid in %o1 */ .globl sunos_getgid sunos_getgid: call sys_getegid nop call sys_getgid stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I1] b,pt %xcc, ret_sys_call stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] /* SunOS's execv() call only specifies the argv argument, the * environment settings are the same as the calling processes. */ .globl sunos_execv sunos_execv: sethi %hi(sparc32_execve), %g1 stx %g0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I2] jmpl %g1 + %lo(sparc32_execve), %g0 add %sp, STACK_BIAS + REGWIN_SZ, %o0 .globl sys_pipe, sys_execve, sys_sigpause, sys_nis_syscall .globl sys_sigsuspend, sys_sigreturn .globl sys32_execve, sys_ptrace .align 32 sys_pipe: sethi %hi(sparc_pipe), %g1 add %sp, STACK_BIAS + REGWIN_SZ, %o0 jmpl %g1 + %lo(sparc_pipe), %g0 nop sys_nis_syscall:sethi %hi(c_sys_nis_syscall), %g1 add %sp, STACK_BIAS + REGWIN_SZ, %o0 jmpl %g1 + %lo(c_sys_nis_syscall), %g0 nop sys_execve: sethi %hi(sparc_execve), %g1 add %sp, STACK_BIAS + REGWIN_SZ, %o0 jmpl %g1 + %lo(sparc_execve), %g0 nop sys32_execve: sethi %hi(sparc32_execve), %g1 add %sp, STACK_BIAS + REGWIN_SZ, %o0 jmpl %g1 + %lo(sparc32_execve), %g0 nop /* NOTE: %o0 has a correct value already */ sys_sigpause: call do_sigpause add %sp, STACK_BIAS + REGWIN_SZ, %o1 ldx [%curptr + AOFF_task_flags], %l5 andcc %l5, 0x20, %g0 be,pt %icc, rtrap clr %l6 call syscall_trace nop ba,pt %xcc, rtrap clr %l6 linux_sparc_ni_syscall: sethi %hi(sys_ni_syscall), %l7 b,pt %xcc,syscall_is_too_hard or %l7, %lo(sys_ni_syscall), %l7 nop .align 32 sys_sigsuspend: call do_sigsuspend add %sp, STACK_BIAS + REGWIN_SZ, %o0 ldx [%curptr + AOFF_task_flags], %l5 andcc %l5, 0x20, %g0 be,pt %icc, rtrap clr %l6 call syscall_trace nop ba,pt %xcc, rtrap clr %l6 .align 32 sys_sigreturn: call do_sigreturn add %sp, STACK_BIAS + REGWIN_SZ, %o0 ldx [%curptr + AOFF_task_flags], %l5 andcc %l5, 0x20, %g0 be,pt %icc, rtrap clr %l6 call syscall_trace nop ba,pt %xcc, rtrap clr %l6 .align 32 sys_ptrace: call do_ptrace add %sp, STACK_BIAS + REGWIN_SZ, %o0 ldx [%curptr + AOFF_task_flags], %l5 andcc %l5, 0x20, %g0 be,pt %icc, rtrap clr %l6 call syscall_trace nop ba,pt %xcc, rtrap clr %l6 /* This is how fork() was meant to be done, 12 instruction entry. * * I questioned the following code briefly, let me clear things * up so you must not reason on it like I did. * * Know the fork_kpsr etc. we use in the sparc32 port? We don't * need it here because the only piece of window state we copy to * the child is the CWP register. Even if the parent sleeps, * we are safe because we stuck it into pt_regs of the parent * so it will not change. * * XXX This raises the question, whether we can do the same on * XXX sparc32 to get rid of fork_kpsr _and_ fork_kwim. The * XXX answer is yes. We stick fork_kpsr in UREG_G0 and * XXX fork_kwim in UREG_G1 (global registers are considered * XXX volatile across a system call in the sparc ABI I think * XXX if it isn't we can use regs->y instead, anyone who depends * XXX upon the Y register being preserved across a fork deserves * XXX to lose). * * In fact we should take advantage of that fact for other things * during system calls... */ .globl sys_fork, sys_vfork, sys_clone .globl ret_from_syscall, ret_from_smpfork .align 32 sys_fork: sys_vfork: mov SIGCHLD, %o0 clr %o1 sys_clone: mov %o7, %l5 add %sp, STACK_BIAS + REGWIN_SZ, %o2 movrz %o1, %fp, %o1 call do_fork mov %l5, %o7 #ifdef __SMP__ ret_from_smpfork: sethi %hi(scheduler_lock), %o4 membar #StoreStore | #LoadStore stb %g0, [%o4 + %lo(scheduler_lock)] #endif ret_from_syscall: b,pt %xcc, ret_sys_call ldx [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0], %o0 linux_syscall_trace: call syscall_trace nop mov %i0, %o0 mov %i1, %o1 mov %i2, %o2 mov %i3, %o3 b,pt %xcc, 2f mov %i4, %o4 /* Linux native and SunOS system calls enter here... */ .align 32 .globl linux_sparc_syscall, syscall_is_too_hard, ret_sys_call linux_sparc_syscall: /* Direct access to user regs, must faster. */ cmp %g1, NR_SYSCALLS ! IEU1 Group bgeu,pn %xcc, linux_sparc_ni_syscall ! CTI mov %i0, %o0 ! IEU0 sll %g1, 2, %l4 ! IEU0 Group mov %i1, %o1 ! IEU1 lduw [%l7 + %l4], %l7 ! Load syscall_is_too_hard: mov %i2, %o2 ! IEU0 Group ldx [%curptr + AOFF_task_flags], %l5 ! Load st %g0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_FPRS] mov %i3, %o3 ! IEU1 mov %i4, %o4 ! IEU0 Group andcc %l5, 0x20, %g0 ! IEU1 2 bubbles bne,pn %icc, linux_syscall_trace ! CTI Group mov %i0, %l5 ! IEU0 2: call %l7 ! CTI Group brk forced mov %i5, %o5 ! IEU0 stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] ret_sys_call: ldx [%curptr + AOFF_task_flags], %l6 sra %o0, 0, %o0 mov %ulo(TSTATE_XCARRY | TSTATE_ICARRY), %g2 ldx [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TSTATE], %g3 cmp %o0, -ENOIOCTLCMD sllx %g2, 32, %g2 bgeu,pn %xcc, 1f andcc %l6, 0x20, %l6 /* System call success, clear Carry condition code. */ andn %g3, %g2, %g3 stx %g3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TSTATE] bne,pn %icc, linux_syscall_trace2 ldx [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TNPC], %l1 ! pc = npc add %l1, 0x4, %l2 !npc = npc+4 stx %l1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TPC] b,pt %xcc, rtrap_clr_l6 stx %l2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TNPC] 1: /* System call failure, set Carry condition code. * Also, get abs(errno) to return to the process. */ sub %g0, %o0, %o0 or %g3, %g2, %g3 stx %o0, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_I0] mov 1, %l6 stx %g3, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TSTATE] bne,pn %icc, linux_syscall_trace2 ldx [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TNPC], %l1 ! pc = npc add %l1, 0x4, %l2 !npc = npc+4 stx %l1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TPC] b,pt %xcc, rtrap stx %l2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TNPC] linux_syscall_trace2: call syscall_trace add %l1, 0x4, %l2 /* npc = npc+4 */ stx %l1, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TPC] ba,pt %xcc, rtrap stx %l2, [%sp + STACK_BIAS + REGWIN_SZ + PT_V9_TNPC] .align 32 .globl __flushw_user __flushw_user: 1: save %sp, -128, %sp rdpr %otherwin, %g1 brnz,pt %g1, 1b add %g2, 1, %g2 1: sub %g2, 1, %g2 brnz,pt %g2, 1b restore %g0, %g0, %g0 2: retl mov %g3, %o7 |