1/* 2 * arch/alpha/kernel/entry.S 3 * 4 * Kernel entry-points. 5 */ 6 7#include <asm/asm-offsets.h> 8#include <asm/thread_info.h> 9#include <asm/pal.h> 10#include <asm/errno.h> 11#include <asm/unistd.h> 12 13 .text 14 .set noat 15 16/* Stack offsets. */ 17#define SP_OFF 184 18#define SWITCH_STACK_SIZE 320 19 20/* 21 * This defines the normal kernel pt-regs layout. 22 * 23 * regs 9-15 preserved by C code 24 * regs 16-18 saved by PAL-code 25 * regs 29-30 saved and set up by PAL-code 26 * JRP - Save regs 16-18 in a special area of the stack, so that 27 * the palcode-provided values are available to the signal handler. 28 */ 29 30#define SAVE_ALL \ 31 subq $sp, SP_OFF, $sp; \ 32 stq $0, 0($sp); \ 33 stq $1, 8($sp); \ 34 stq $2, 16($sp); \ 35 stq $3, 24($sp); \ 36 stq $4, 32($sp); \ 37 stq $28, 144($sp); \ 38 lda $2, alpha_mv; \ 39 stq $5, 40($sp); \ 40 stq $6, 48($sp); \ 41 stq $7, 56($sp); \ 42 stq $8, 64($sp); \ 43 stq $19, 72($sp); \ 44 stq $20, 80($sp); \ 45 stq $21, 88($sp); \ 46 ldq $2, HAE_CACHE($2); \ 47 stq $22, 96($sp); \ 48 stq $23, 104($sp); \ 49 stq $24, 112($sp); \ 50 stq $25, 120($sp); \ 51 stq $26, 128($sp); \ 52 stq $27, 136($sp); \ 53 stq $2, 152($sp); \ 54 stq $16, 160($sp); \ 55 stq $17, 168($sp); \ 56 stq $18, 176($sp) 57 58#define RESTORE_ALL \ 59 lda $19, alpha_mv; \ 60 ldq $0, 0($sp); \ 61 ldq $1, 8($sp); \ 62 ldq $2, 16($sp); \ 63 ldq $3, 24($sp); \ 64 ldq $21, 152($sp); \ 65 ldq $20, HAE_CACHE($19); \ 66 ldq $4, 32($sp); \ 67 ldq $5, 40($sp); \ 68 ldq $6, 48($sp); \ 69 ldq $7, 56($sp); \ 70 subq $20, $21, $20; \ 71 ldq $8, 64($sp); \ 72 beq $20, 99f; \ 73 ldq $20, HAE_REG($19); \ 74 stq $21, HAE_CACHE($19); \ 75 stq $21, 0($20); \ 76 ldq $0, 0($sp); \ 77 ldq $1, 8($sp); \ 7899:; \ 79 ldq $19, 72($sp); \ 80 ldq $20, 80($sp); \ 81 ldq $21, 88($sp); \ 82 ldq $22, 96($sp); \ 83 ldq $23, 104($sp); \ 84 ldq $24, 112($sp); \ 85 ldq $25, 120($sp); \ 86 ldq $26, 128($sp); \ 87 ldq $27, 136($sp); \ 88 ldq $28, 144($sp); \ 89 addq $sp, SP_OFF, $sp 90 91/* 92 * Non-syscall kernel entry points. 93 */ 94 95 .align 4 96 .globl entInt 97 .ent entInt 98entInt: 99 SAVE_ALL 100 lda $8, 0x3fff 101 lda $26, ret_from_sys_call 102 bic $sp, $8, $8 103 mov $sp, $19 104 jsr $31, do_entInt 105.end entInt 106 107 .align 4 108 .globl entArith 109 .ent entArith 110entArith: 111 SAVE_ALL 112 lda $8, 0x3fff 113 lda $26, ret_from_sys_call 114 bic $sp, $8, $8 115 mov $sp, $18 116 jsr $31, do_entArith 117.end entArith 118 119 .align 4 120 .globl entMM 121 .ent entMM 122entMM: 123 SAVE_ALL 124/* save $9 - $15 so the inline exception code can manipulate them. */ 125 subq $sp, 56, $sp 126 stq $9, 0($sp) 127 stq $10, 8($sp) 128 stq $11, 16($sp) 129 stq $12, 24($sp) 130 stq $13, 32($sp) 131 stq $14, 40($sp) 132 stq $15, 48($sp) 133 addq $sp, 56, $19 134/* handle the fault */ 135 lda $8, 0x3fff 136 bic $sp, $8, $8 137 jsr $26, do_page_fault 138/* reload the registers after the exception code played. */ 139 ldq $9, 0($sp) 140 ldq $10, 8($sp) 141 ldq $11, 16($sp) 142 ldq $12, 24($sp) 143 ldq $13, 32($sp) 144 ldq $14, 40($sp) 145 ldq $15, 48($sp) 146 addq $sp, 56, $sp 147/* finish up the syscall as normal. */ 148 br ret_from_sys_call 149.end entMM 150 151 .align 4 152 .globl entIF 153 .ent entIF 154entIF: 155 SAVE_ALL 156 lda $8, 0x3fff 157 lda $26, ret_from_sys_call 158 bic $sp, $8, $8 159 mov $sp, $17 160 jsr $31, do_entIF 161.end entIF 162 163 .align 4 164 .globl entUna 165 .ent entUna 166entUna: 167 lda $sp, -256($sp) 168 stq $0, 0($sp) 169 ldq $0, 256($sp) /* get PS */ 170 stq $1, 8($sp) 171 stq $2, 16($sp) 172 stq $3, 24($sp) 173 and $0, 8, $0 /* user mode? */ 174 stq $4, 32($sp) 175 bne $0, entUnaUser /* yup -> do user-level unaligned fault */ 176 stq $5, 40($sp) 177 stq $6, 48($sp) 178 stq $7, 56($sp) 179 stq $8, 64($sp) 180 stq $9, 72($sp) 181 stq $10, 80($sp) 182 stq $11, 88($sp) 183 stq $12, 96($sp) 184 stq $13, 104($sp) 185 stq $14, 112($sp) 186 stq $15, 120($sp) 187 /* 16-18 PAL-saved */ 188 stq $19, 152($sp) 189 stq $20, 160($sp) 190 stq $21, 168($sp) 191 stq $22, 176($sp) 192 stq $23, 184($sp) 193 stq $24, 192($sp) 194 stq $25, 200($sp) 195 stq $26, 208($sp) 196 stq $27, 216($sp) 197 stq $28, 224($sp) 198 mov $sp, $19 199 stq $gp, 232($sp) 200 lda $8, 0x3fff 201 stq $31, 248($sp) 202 bic $sp, $8, $8 203 jsr $26, do_entUna 204 ldq $0, 0($sp) 205 ldq $1, 8($sp) 206 ldq $2, 16($sp) 207 ldq $3, 24($sp) 208 ldq $4, 32($sp) 209 ldq $5, 40($sp) 210 ldq $6, 48($sp) 211 ldq $7, 56($sp) 212 ldq $8, 64($sp) 213 ldq $9, 72($sp) 214 ldq $10, 80($sp) 215 ldq $11, 88($sp) 216 ldq $12, 96($sp) 217 ldq $13, 104($sp) 218 ldq $14, 112($sp) 219 ldq $15, 120($sp) 220 /* 16-18 PAL-saved */ 221 ldq $19, 152($sp) 222 ldq $20, 160($sp) 223 ldq $21, 168($sp) 224 ldq $22, 176($sp) 225 ldq $23, 184($sp) 226 ldq $24, 192($sp) 227 ldq $25, 200($sp) 228 ldq $26, 208($sp) 229 ldq $27, 216($sp) 230 ldq $28, 224($sp) 231 ldq $gp, 232($sp) 232 lda $sp, 256($sp) 233 call_pal PAL_rti 234.end entUna 235 236 .align 4 237 .ent entUnaUser 238entUnaUser: 239 ldq $0, 0($sp) /* restore original $0 */ 240 lda $sp, 256($sp) /* pop entUna's stack frame */ 241 SAVE_ALL /* setup normal kernel stack */ 242 lda $sp, -56($sp) 243 stq $9, 0($sp) 244 stq $10, 8($sp) 245 stq $11, 16($sp) 246 stq $12, 24($sp) 247 stq $13, 32($sp) 248 stq $14, 40($sp) 249 stq $15, 48($sp) 250 lda $8, 0x3fff 251 addq $sp, 56, $19 252 bic $sp, $8, $8 253 jsr $26, do_entUnaUser 254 ldq $9, 0($sp) 255 ldq $10, 8($sp) 256 ldq $11, 16($sp) 257 ldq $12, 24($sp) 258 ldq $13, 32($sp) 259 ldq $14, 40($sp) 260 ldq $15, 48($sp) 261 lda $sp, 56($sp) 262 br ret_from_sys_call 263.end entUnaUser 264 265 .align 4 266 .globl entDbg 267 .ent entDbg 268entDbg: 269 SAVE_ALL 270 lda $8, 0x3fff 271 lda $26, ret_from_sys_call 272 bic $sp, $8, $8 273 mov $sp, $16 274 jsr $31, do_entDbg 275.end entDbg 276 277/* 278 * The system call entry point is special. Most importantly, it looks 279 * like a function call to userspace as far as clobbered registers. We 280 * do preserve the argument registers (for syscall restarts) and $26 281 * (for leaf syscall functions). 282 * 283 * So much for theory. We don't take advantage of this yet. 284 * 285 * Note that a0-a2 are not saved by PALcode as with the other entry points. 286 */ 287 288 .align 4 289 .globl entSys 290 .globl ret_from_sys_call 291 .ent entSys 292entSys: 293 SAVE_ALL 294 lda $8, 0x3fff 295 bic $sp, $8, $8 296 lda $4, NR_SYSCALLS($31) 297 stq $16, SP_OFF+24($sp) 298 lda $5, sys_call_table 299 lda $27, sys_ni_syscall 300 cmpult $0, $4, $4 301 ldl $3, TI_FLAGS($8) 302 stq $17, SP_OFF+32($sp) 303 s8addq $0, $5, $5 304 stq $18, SP_OFF+40($sp) 305 blbs $3, strace 306 beq $4, 1f 307 ldq $27, 0($5) 3081: jsr $26, ($27), alpha_ni_syscall 309 ldgp $gp, 0($26) 310 blt $0, $syscall_error /* the call failed */ 311 stq $0, 0($sp) 312 stq $31, 72($sp) /* a3=0 => no error */ 313 314 .align 4 315ret_from_sys_call: 316 cmovne $26, 0, $19 /* $19 = 0 => non-restartable */ 317 ldq $0, SP_OFF($sp) 318 and $0, 8, $0 319 beq $0, restore_all 320ret_from_reschedule: 321 /* Make sure need_resched and sigpending don't change between 322 sampling and the rti. */ 323 lda $16, 7 324 call_pal PAL_swpipl 325 ldl $5, TI_FLAGS($8) 326 and $5, _TIF_WORK_MASK, $2 327 bne $5, work_pending 328restore_all: 329 RESTORE_ALL 330 call_pal PAL_rti 331 332 .align 3 333$syscall_error: 334 /* 335 * Some system calls (e.g., ptrace) can return arbitrary 336 * values which might normally be mistaken as error numbers. 337 * Those functions must zero $0 (v0) directly in the stack 338 * frame to indicate that a negative return value wasn't an 339 * error number.. 340 */ 341 ldq $19, 0($sp) /* old syscall nr (zero if success) */ 342 beq $19, $ret_success 343 344 ldq $20, 72($sp) /* .. and this a3 */ 345 subq $31, $0, $0 /* with error in v0 */ 346 addq $31, 1, $1 /* set a3 for errno return */ 347 stq $0, 0($sp) 348 mov $31, $26 /* tell "ret_from_sys_call" we can restart */ 349 stq $1, 72($sp) /* a3 for return */ 350 br ret_from_sys_call 351 352$ret_success: 353 stq $0, 0($sp) 354 stq $31, 72($sp) /* a3=0 => no error */ 355 br ret_from_sys_call 356.end entSys 357 358/* 359 * Do all cleanup when returning from all interrupts and system calls. 360 * 361 * Arguments: 362 * $5: TI_FLAGS. 363 * $8: current. 364 * $19: The old syscall number, or zero if this is not a return 365 * from a syscall that errored and is possibly restartable. 366 * $20: Error indication. 367 */ 368 369 .align 4 370 .ent work_pending 371work_pending: 372 and $5, _TIF_NEED_RESCHED, $2 373 beq $2, $work_notifysig 374 375$work_resched: 376 subq $sp, 16, $sp 377 stq $19, 0($sp) /* save syscall nr */ 378 stq $20, 8($sp) /* and error indication (a3) */ 379 jsr $26, schedule 380 ldq $19, 0($sp) 381 ldq $20, 8($sp) 382 addq $sp, 16, $sp 383 /* Make sure need_resched and sigpending don't change between 384 sampling and the rti. */ 385 lda $16, 7 386 call_pal PAL_swpipl 387 ldl $5, TI_FLAGS($8) 388 and $5, _TIF_WORK_MASK, $2 389 beq $2, restore_all 390 and $5, _TIF_NEED_RESCHED, $2 391 bne $2, $work_resched 392 393$work_notifysig: 394 mov $sp, $17 395 br $1, do_switch_stack 396 mov $5, $21 397 mov $sp, $18 398 mov $31, $16 399 jsr $26, do_notify_resume 400 bsr $1, undo_switch_stack 401 br restore_all 402.end work_pending 403 404/* 405 * PTRACE syscall handler 406 */ 407 408 .align 4 409 .ent strace 410strace: 411 /* set up signal stack, call syscall_trace */ 412 bsr $1, do_switch_stack 413 jsr $26, syscall_trace 414 bsr $1, undo_switch_stack 415 416 /* get the system call number and the arguments back.. */ 417 ldq $0, 0($sp) 418 ldq $16, SP_OFF+24($sp) 419 ldq $17, SP_OFF+32($sp) 420 ldq $18, SP_OFF+40($sp) 421 ldq $19, 72($sp) 422 ldq $20, 80($sp) 423 ldq $21, 88($sp) 424 425 /* get the system call pointer.. */ 426 lda $1, NR_SYSCALLS($31) 427 lda $2, sys_call_table 428 lda $27, alpha_ni_syscall 429 cmpult $0, $1, $1 430 s8addq $0, $2, $2 431 beq $1, 1f 432 ldq $27, 0($2) 4331: jsr $26, ($27), sys_gettimeofday 434 ldgp $gp, 0($26) 435 436 /* check return.. */ 437 blt $0, $strace_error /* the call failed */ 438 stq $31, 72($sp) /* a3=0 => no error */ 439$strace_success: 440 stq $0, 0($sp) /* save return value */ 441 442 bsr $1, do_switch_stack 443 jsr $26, syscall_trace 444 bsr $1, undo_switch_stack 445 br $31, ret_from_sys_call 446 447 .align 3 448$strace_error: 449 ldq $19, 0($sp) /* old syscall nr (zero if success) */ 450 beq $19, $strace_success 451 ldq $20, 72($sp) /* .. and this a3 */ 452 453 subq $31, $0, $0 /* with error in v0 */ 454 addq $31, 1, $1 /* set a3 for errno return */ 455 stq $0, 0($sp) 456 stq $1, 72($sp) /* a3 for return */ 457 458 bsr $1, do_switch_stack 459 mov $19, $9 /* save old syscall number */ 460 mov $20, $10 /* save old a3 */ 461 jsr $26, syscall_trace 462 mov $9, $19 463 mov $10, $20 464 bsr $1, undo_switch_stack 465 466 mov $31, $26 /* tell "ret_from_sys_call" we can restart */ 467 br ret_from_sys_call 468.end strace 469 470/* 471 * Save and restore the switch stack -- aka the balance of the user context. 472 */ 473 474 .align 4 475 .ent do_switch_stack 476do_switch_stack: 477 lda $sp, -SWITCH_STACK_SIZE($sp) 478 stq $9, 0($sp) 479 stq $10, 8($sp) 480 stq $11, 16($sp) 481 stq $12, 24($sp) 482 stq $13, 32($sp) 483 stq $14, 40($sp) 484 stq $15, 48($sp) 485 stq $26, 56($sp) 486 stt $f0, 64($sp) 487 stt $f1, 72($sp) 488 stt $f2, 80($sp) 489 stt $f3, 88($sp) 490 stt $f4, 96($sp) 491 stt $f5, 104($sp) 492 stt $f6, 112($sp) 493 stt $f7, 120($sp) 494 stt $f8, 128($sp) 495 stt $f9, 136($sp) 496 stt $f10, 144($sp) 497 stt $f11, 152($sp) 498 stt $f12, 160($sp) 499 stt $f13, 168($sp) 500 stt $f14, 176($sp) 501 stt $f15, 184($sp) 502 stt $f16, 192($sp) 503 stt $f17, 200($sp) 504 stt $f18, 208($sp) 505 stt $f19, 216($sp) 506 stt $f20, 224($sp) 507 stt $f21, 232($sp) 508 stt $f22, 240($sp) 509 stt $f23, 248($sp) 510 stt $f24, 256($sp) 511 stt $f25, 264($sp) 512 stt $f26, 272($sp) 513 stt $f27, 280($sp) 514 mf_fpcr $f0 # get fpcr 515 stt $f28, 288($sp) 516 stt $f29, 296($sp) 517 stt $f30, 304($sp) 518 stt $f0, 312($sp) # save fpcr in slot of $f31 519 ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state. 520 ret $31, ($1), 1 521.end do_switch_stack 522 523 .align 4 524 .ent undo_switch_stack 525undo_switch_stack: 526 ldq $9, 0($sp) 527 ldq $10, 8($sp) 528 ldq $11, 16($sp) 529 ldq $12, 24($sp) 530 ldq $13, 32($sp) 531 ldq $14, 40($sp) 532 ldq $15, 48($sp) 533 ldq $26, 56($sp) 534 ldt $f30, 312($sp) # get saved fpcr 535 ldt $f0, 64($sp) 536 ldt $f1, 72($sp) 537 ldt $f2, 80($sp) 538 ldt $f3, 88($sp) 539 mt_fpcr $f30 # install saved fpcr 540 ldt $f4, 96($sp) 541 ldt $f5, 104($sp) 542 ldt $f6, 112($sp) 543 ldt $f7, 120($sp) 544 ldt $f8, 128($sp) 545 ldt $f9, 136($sp) 546 ldt $f10, 144($sp) 547 ldt $f11, 152($sp) 548 ldt $f12, 160($sp) 549 ldt $f13, 168($sp) 550 ldt $f14, 176($sp) 551 ldt $f15, 184($sp) 552 ldt $f16, 192($sp) 553 ldt $f17, 200($sp) 554 ldt $f18, 208($sp) 555 ldt $f19, 216($sp) 556 ldt $f20, 224($sp) 557 ldt $f21, 232($sp) 558 ldt $f22, 240($sp) 559 ldt $f23, 248($sp) 560 ldt $f24, 256($sp) 561 ldt $f25, 264($sp) 562 ldt $f26, 272($sp) 563 ldt $f27, 280($sp) 564 ldt $f28, 288($sp) 565 ldt $f29, 296($sp) 566 ldt $f30, 304($sp) 567 lda $sp, SWITCH_STACK_SIZE($sp) 568 ret $31, ($1), 1 569.end undo_switch_stack 570 571/* 572 * The meat of the context switch code. 573 */ 574 575 .align 4 576 .globl alpha_switch_to 577 .ent alpha_switch_to 578alpha_switch_to: 579 .prologue 0 580 bsr $1, do_switch_stack 581 call_pal PAL_swpctx 582 lda $8, 0x3fff 583 bsr $1, undo_switch_stack 584 bic $sp, $8, $8 585 mov $17, $0 586 ret 587.end alpha_switch_to 588 589/* 590 * New processes begin life here. 591 */ 592 593 .globl ret_from_fork 594 .align 4 595 .ent ret_from_fork 596ret_from_fork: 597 lda $26, ret_from_sys_call 598 mov $17, $16 599 jmp $31, schedule_tail 600.end ret_from_fork 601 602/* 603 * kernel_thread(fn, arg, clone_flags) 604 */ 605 .align 4 606 .globl kernel_thread 607 .ent kernel_thread 608kernel_thread: 609 /* We can be called from a module. */ 610 ldgp $gp, 0($27) 611 .prologue 1 612 subq $sp, SP_OFF+6*8, $sp 613 br $1, 2f /* load start address */ 614 615 /* We've now "returned" from a fake system call. */ 616 unop 617 blt $0, 1f /* error? */ 618 ldi $1, 0x3fff 619 beq $20, 1f /* parent or child? */ 620 621 bic $sp, $1, $8 /* in child. */ 622 jsr $26, ($27) 623 ldgp $gp, 0($26) 624 mov $0, $16 625 mov $31, $26 626 jmp $31, sys_exit 627 6281: ret /* in parent. */ 629 630 .align 4 6312: /* Fake a system call stack frame, as we can't do system calls 632 from kernel space. Note that we store FN and ARG as they 633 need to be set up in the child for the call. Also store $8 634 and $26 for use in the parent. */ 635 stq $31, SP_OFF($sp) /* ps */ 636 stq $1, SP_OFF+8($sp) /* pc */ 637 stq $gp, SP_OFF+16($sp) /* gp */ 638 stq $16, 136($sp) /* $27; FN for child */ 639 stq $17, SP_OFF+24($sp) /* $16; ARG for child */ 640 stq $8, 64($sp) /* $8 */ 641 stq $26, 128($sp) /* $26 */ 642 /* Avoid the HAE being gratuitously wrong, to avoid restoring it. */ 643 ldq $2, alpha_mv+HAE_CACHE 644 stq $2, 152($sp) /* HAE */ 645 646 /* Shuffle FLAGS to the front; add CLONE_VM. */ 647 ldi $1, CLONE_VM|CLONE_UNTRACED 648 or $18, $1, $16 649 bsr $26, sys_clone 650 651 /* We don't actually care for a3 success widgetry in the kernel. 652 Not for positive errno values. */ 653 stq $0, 0($sp) /* $0 */ 654 br restore_all 655.end kernel_thread 656 657/* 658 * execve(path, argv, envp) 659 */ 660 .align 4 661 .globl execve 662 .ent execve 663execve: 664 /* We can be called from a module. */ 665 ldgp $gp, 0($27) 666 lda $sp, -(32+SIZEOF_PT_REGS+8)($sp) 667 .frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0 668 stq $26, 0($sp) 669 stq $16, 8($sp) 670 stq $17, 16($sp) 671 stq $18, 24($sp) 672 .prologue 1 673 674 lda $16, 32($sp) 675 lda $17, 0 676 lda $18, SIZEOF_PT_REGS 677 bsr $26, memset !samegp 678 679 /* Avoid the HAE being gratuitously wrong, which would cause us 680 to do the whole turn off interrupts thing and restore it. */ 681 ldq $2, alpha_mv+HAE_CACHE 682 stq $2, 152+32($sp) 683 684 ldq $16, 8($sp) 685 ldq $17, 16($sp) 686 ldq $18, 24($sp) 687 lda $19, 32($sp) 688 bsr $26, do_execve !samegp 689 690 ldq $26, 0($sp) 691 bne $0, 1f /* error! */ 692 693 /* Move the temporary pt_regs struct from its current location 694 to the top of the kernel stack frame. See copy_thread for 695 details for a normal process. */ 696 lda $16, 0x4000 - SIZEOF_PT_REGS($8) 697 lda $17, 32($sp) 698 lda $18, SIZEOF_PT_REGS 699 bsr $26, memmove !samegp 700 701 /* Take that over as our new stack frame and visit userland! */ 702 lda $sp, 0x4000 - SIZEOF_PT_REGS($8) 703 br $31, ret_from_sys_call 704 7051: lda $sp, 32+SIZEOF_PT_REGS+8($sp) 706 ret 707.end execve 708 709 710/* 711 * Special system calls. Most of these are special in that they either 712 * have to play switch_stack games or in some way use the pt_regs struct. 713 */ 714 .align 4 715 .globl sys_fork 716 .ent sys_fork 717sys_fork: 718 .prologue 0 719 mov $sp, $21 720 bsr $1, do_switch_stack 721 bis $31, SIGCHLD, $16 722 mov $31, $17 723 mov $31, $18 724 mov $31, $19 725 mov $31, $20 726 jsr $26, alpha_clone 727 bsr $1, undo_switch_stack 728 ret 729.end sys_fork 730 731 .align 4 732 .globl sys_clone 733 .ent sys_clone 734sys_clone: 735 .prologue 0 736 mov $sp, $21 737 bsr $1, do_switch_stack 738 /* $16, $17, $18, $19, $20 come from the user. */ 739 jsr $26, alpha_clone 740 bsr $1, undo_switch_stack 741 ret 742.end sys_clone 743 744 .align 4 745 .globl sys_vfork 746 .ent sys_vfork 747sys_vfork: 748 .prologue 0 749 mov $sp, $16 750 bsr $1, do_switch_stack 751 jsr $26, alpha_vfork 752 bsr $1, undo_switch_stack 753 ret 754.end sys_vfork 755 756 .align 4 757 .globl sys_sigreturn 758 .ent sys_sigreturn 759sys_sigreturn: 760 .prologue 0 761 mov $sp, $17 762 lda $18, -SWITCH_STACK_SIZE($sp) 763 lda $sp, -SWITCH_STACK_SIZE($sp) 764 jsr $26, do_sigreturn 765 br $1, undo_switch_stack 766 br ret_from_sys_call 767.end sys_sigreturn 768 769 .align 4 770 .globl sys_rt_sigreturn 771 .ent sys_rt_sigreturn 772sys_rt_sigreturn: 773 .prologue 0 774 mov $sp, $17 775 lda $18, -SWITCH_STACK_SIZE($sp) 776 lda $sp, -SWITCH_STACK_SIZE($sp) 777 jsr $26, do_rt_sigreturn 778 br $1, undo_switch_stack 779 br ret_from_sys_call 780.end sys_rt_sigreturn 781 782 .align 4 783 .globl sys_sigsuspend 784 .ent sys_sigsuspend 785sys_sigsuspend: 786 .prologue 0 787 mov $sp, $17 788 br $1, do_switch_stack 789 mov $sp, $18 790 subq $sp, 16, $sp 791 stq $26, 0($sp) 792 jsr $26, do_sigsuspend 793 ldq $26, 0($sp) 794 lda $sp, SWITCH_STACK_SIZE+16($sp) 795 ret 796.end sys_sigsuspend 797 798 .align 4 799 .globl sys_rt_sigsuspend 800 .ent sys_rt_sigsuspend 801sys_rt_sigsuspend: 802 .prologue 0 803 mov $sp, $18 804 br $1, do_switch_stack 805 mov $sp, $19 806 subq $sp, 16, $sp 807 stq $26, 0($sp) 808 jsr $26, do_rt_sigsuspend 809 ldq $26, 0($sp) 810 lda $sp, SWITCH_STACK_SIZE+16($sp) 811 ret 812.end sys_rt_sigsuspend 813 814 .align 4 815 .globl sys_sethae 816 .ent sys_sethae 817sys_sethae: 818 .prologue 0 819 stq $16, 152($sp) 820 ret 821.end sys_sethae 822 823 .align 4 824 .globl osf_getpriority 825 .ent osf_getpriority 826osf_getpriority: 827 lda $sp, -16($sp) 828 stq $26, 0($sp) 829 .prologue 0 830 831 jsr $26, sys_getpriority 832 833 ldq $26, 0($sp) 834 blt $0, 1f 835 836 /* Return value is the unbiased priority, i.e. 20 - prio. 837 This does result in negative return values, so signal 838 no error by writing into the R0 slot. */ 839 lda $1, 20 840 stq $31, 16($sp) 841 subl $1, $0, $0 842 unop 843 8441: lda $sp, 16($sp) 845 ret 846.end osf_getpriority 847 848 .align 4 849 .globl sys_getxuid 850 .ent sys_getxuid 851sys_getxuid: 852 .prologue 0 853 ldq $2, TI_TASK($8) 854 ldl $0, TASK_UID($2) 855 ldl $1, TASK_EUID($2) 856 stq $1, 80($sp) 857 ret 858.end sys_getxuid 859 860 .align 4 861 .globl sys_getxgid 862 .ent sys_getxgid 863sys_getxgid: 864 .prologue 0 865 ldq $2, TI_TASK($8) 866 ldl $0, TASK_GID($2) 867 ldl $1, TASK_EGID($2) 868 stq $1, 80($sp) 869 ret 870.end sys_getxgid 871 872 .align 4 873 .globl sys_getxpid 874 .ent sys_getxpid 875sys_getxpid: 876 .prologue 0 877 ldq $2, TI_TASK($8) 878 879 /* See linux/kernel/timer.c sys_getppid for discussion 880 about this loop. */ 881 ldq $3, TASK_GROUP_LEADER($2) 882 ldq $4, TASK_REAL_PARENT($3) 883 ldl $0, TASK_TGID($2) 8841: ldl $1, TASK_TGID($4) 885#ifdef CONFIG_SMP 886 mov $4, $5 887 mb 888 ldq $3, TASK_GROUP_LEADER($2) 889 ldq $4, TASK_REAL_PARENT($3) 890 cmpeq $4, $5, $5 891 beq $5, 1b 892#endif 893 stq $1, 80($sp) 894 ret 895.end sys_getxpid 896 897 .align 4 898 .globl sys_pipe 899 .ent sys_pipe 900sys_pipe: 901 lda $sp, -16($sp) 902 stq $26, 0($sp) 903 .prologue 0 904 905 lda $16, 8($sp) 906 jsr $26, do_pipe 907 908 ldq $26, 0($sp) 909 bne $0, 1f 910 911 /* The return values are in $0 and $20. */ 912 ldl $1, 12($sp) 913 ldl $0, 8($sp) 914 915 stq $1, 80+16($sp) 9161: lda $sp, 16($sp) 917 ret 918.end sys_pipe 919 920 .align 4 921 .globl sys_ptrace 922 .ent sys_ptrace 923sys_ptrace: 924 .prologue 0 925 mov $sp, $20 926 jmp $31, do_sys_ptrace 927.end sys_ptrace 928 929 .align 4 930 .globl sys_execve 931 .ent sys_execve 932sys_execve: 933 .prologue 0 934 mov $sp, $19 935 jmp $31, do_sys_execve 936.end sys_execve 937 938 .align 4 939 .globl osf_sigprocmask 940 .ent osf_sigprocmask 941osf_sigprocmask: 942 .prologue 0 943 mov $sp, $18 944 jmp $31, do_osf_sigprocmask 945.end osf_sigprocmask 946 947 .align 4 948 .globl alpha_ni_syscall 949 .ent alpha_ni_syscall 950alpha_ni_syscall: 951 .prologue 0 952 /* Special because it also implements overflow handling via 953 syscall number 0. And if you recall, zero is a special 954 trigger for "not an error". Store large non-zero there. */ 955 lda $0, -ENOSYS 956 unop 957 stq $0, 0($sp) 958 ret 959.end alpha_ni_syscall 960