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, $16 395 br $1, do_switch_stack 396 mov $sp, $17 397 mov $5, $18 398 jsr $26, do_notify_resume 399 bsr $1, undo_switch_stack 400 br restore_all 401.end work_pending 402 403/* 404 * PTRACE syscall handler 405 */ 406 407 .align 4 408 .ent strace 409strace: 410 /* set up signal stack, call syscall_trace */ 411 bsr $1, do_switch_stack 412 jsr $26, syscall_trace 413 bsr $1, undo_switch_stack 414 415 /* get the system call number and the arguments back.. */ 416 ldq $0, 0($sp) 417 ldq $16, SP_OFF+24($sp) 418 ldq $17, SP_OFF+32($sp) 419 ldq $18, SP_OFF+40($sp) 420 ldq $19, 72($sp) 421 ldq $20, 80($sp) 422 ldq $21, 88($sp) 423 424 /* get the system call pointer.. */ 425 lda $1, NR_SYSCALLS($31) 426 lda $2, sys_call_table 427 lda $27, alpha_ni_syscall 428 cmpult $0, $1, $1 429 s8addq $0, $2, $2 430 beq $1, 1f 431 ldq $27, 0($2) 4321: jsr $26, ($27), sys_gettimeofday 433 ldgp $gp, 0($26) 434 435 /* check return.. */ 436 blt $0, $strace_error /* the call failed */ 437 stq $31, 72($sp) /* a3=0 => no error */ 438$strace_success: 439 stq $0, 0($sp) /* save return value */ 440 441 bsr $1, do_switch_stack 442 jsr $26, syscall_trace 443 bsr $1, undo_switch_stack 444 br $31, ret_from_sys_call 445 446 .align 3 447$strace_error: 448 ldq $19, 0($sp) /* old syscall nr (zero if success) */ 449 beq $19, $strace_success 450 ldq $20, 72($sp) /* .. and this a3 */ 451 452 subq $31, $0, $0 /* with error in v0 */ 453 addq $31, 1, $1 /* set a3 for errno return */ 454 stq $0, 0($sp) 455 stq $1, 72($sp) /* a3 for return */ 456 457 bsr $1, do_switch_stack 458 mov $19, $9 /* save old syscall number */ 459 mov $20, $10 /* save old a3 */ 460 jsr $26, syscall_trace 461 mov $9, $19 462 mov $10, $20 463 bsr $1, undo_switch_stack 464 465 mov $31, $26 /* tell "ret_from_sys_call" we can restart */ 466 br ret_from_sys_call 467.end strace 468 469/* 470 * Save and restore the switch stack -- aka the balance of the user context. 471 */ 472 473 .align 4 474 .ent do_switch_stack 475do_switch_stack: 476 lda $sp, -SWITCH_STACK_SIZE($sp) 477 stq $9, 0($sp) 478 stq $10, 8($sp) 479 stq $11, 16($sp) 480 stq $12, 24($sp) 481 stq $13, 32($sp) 482 stq $14, 40($sp) 483 stq $15, 48($sp) 484 stq $26, 56($sp) 485 stt $f0, 64($sp) 486 stt $f1, 72($sp) 487 stt $f2, 80($sp) 488 stt $f3, 88($sp) 489 stt $f4, 96($sp) 490 stt $f5, 104($sp) 491 stt $f6, 112($sp) 492 stt $f7, 120($sp) 493 stt $f8, 128($sp) 494 stt $f9, 136($sp) 495 stt $f10, 144($sp) 496 stt $f11, 152($sp) 497 stt $f12, 160($sp) 498 stt $f13, 168($sp) 499 stt $f14, 176($sp) 500 stt $f15, 184($sp) 501 stt $f16, 192($sp) 502 stt $f17, 200($sp) 503 stt $f18, 208($sp) 504 stt $f19, 216($sp) 505 stt $f20, 224($sp) 506 stt $f21, 232($sp) 507 stt $f22, 240($sp) 508 stt $f23, 248($sp) 509 stt $f24, 256($sp) 510 stt $f25, 264($sp) 511 stt $f26, 272($sp) 512 stt $f27, 280($sp) 513 mf_fpcr $f0 # get fpcr 514 stt $f28, 288($sp) 515 stt $f29, 296($sp) 516 stt $f30, 304($sp) 517 stt $f0, 312($sp) # save fpcr in slot of $f31 518 ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state. 519 ret $31, ($1), 1 520.end do_switch_stack 521 522 .align 4 523 .ent undo_switch_stack 524undo_switch_stack: 525 ldq $9, 0($sp) 526 ldq $10, 8($sp) 527 ldq $11, 16($sp) 528 ldq $12, 24($sp) 529 ldq $13, 32($sp) 530 ldq $14, 40($sp) 531 ldq $15, 48($sp) 532 ldq $26, 56($sp) 533 ldt $f30, 312($sp) # get saved fpcr 534 ldt $f0, 64($sp) 535 ldt $f1, 72($sp) 536 ldt $f2, 80($sp) 537 ldt $f3, 88($sp) 538 mt_fpcr $f30 # install saved fpcr 539 ldt $f4, 96($sp) 540 ldt $f5, 104($sp) 541 ldt $f6, 112($sp) 542 ldt $f7, 120($sp) 543 ldt $f8, 128($sp) 544 ldt $f9, 136($sp) 545 ldt $f10, 144($sp) 546 ldt $f11, 152($sp) 547 ldt $f12, 160($sp) 548 ldt $f13, 168($sp) 549 ldt $f14, 176($sp) 550 ldt $f15, 184($sp) 551 ldt $f16, 192($sp) 552 ldt $f17, 200($sp) 553 ldt $f18, 208($sp) 554 ldt $f19, 216($sp) 555 ldt $f20, 224($sp) 556 ldt $f21, 232($sp) 557 ldt $f22, 240($sp) 558 ldt $f23, 248($sp) 559 ldt $f24, 256($sp) 560 ldt $f25, 264($sp) 561 ldt $f26, 272($sp) 562 ldt $f27, 280($sp) 563 ldt $f28, 288($sp) 564 ldt $f29, 296($sp) 565 ldt $f30, 304($sp) 566 lda $sp, SWITCH_STACK_SIZE($sp) 567 ret $31, ($1), 1 568.end undo_switch_stack 569 570/* 571 * The meat of the context switch code. 572 */ 573 574 .align 4 575 .globl alpha_switch_to 576 .ent alpha_switch_to 577alpha_switch_to: 578 .prologue 0 579 bsr $1, do_switch_stack 580 call_pal PAL_swpctx 581 lda $8, 0x3fff 582 bsr $1, undo_switch_stack 583 bic $sp, $8, $8 584 mov $17, $0 585 ret 586.end alpha_switch_to 587 588/* 589 * New processes begin life here. 590 */ 591 592 .globl ret_from_fork 593 .align 4 594 .ent ret_from_fork 595ret_from_fork: 596 lda $26, ret_from_sys_call 597 mov $17, $16 598 jmp $31, schedule_tail 599.end ret_from_fork 600 601/* 602 * kernel_thread(fn, arg, clone_flags) 603 */ 604 .align 4 605 .globl kernel_thread 606 .ent kernel_thread 607kernel_thread: 608 /* We can be called from a module. */ 609 ldgp $gp, 0($27) 610 .prologue 1 611 subq $sp, SP_OFF+6*8, $sp 612 br $1, 2f /* load start address */ 613 614 /* We've now "returned" from a fake system call. */ 615 unop 616 blt $0, 1f /* error? */ 617 ldi $1, 0x3fff 618 beq $20, 1f /* parent or child? */ 619 620 bic $sp, $1, $8 /* in child. */ 621 jsr $26, ($27) 622 ldgp $gp, 0($26) 623 mov $0, $16 624 mov $31, $26 625 jmp $31, sys_exit 626 6271: ret /* in parent. */ 628 629 .align 4 6302: /* Fake a system call stack frame, as we can't do system calls 631 from kernel space. Note that we store FN and ARG as they 632 need to be set up in the child for the call. Also store $8 633 and $26 for use in the parent. */ 634 stq $31, SP_OFF($sp) /* ps */ 635 stq $1, SP_OFF+8($sp) /* pc */ 636 stq $gp, SP_OFF+16($sp) /* gp */ 637 stq $16, 136($sp) /* $27; FN for child */ 638 stq $17, SP_OFF+24($sp) /* $16; ARG for child */ 639 stq $8, 64($sp) /* $8 */ 640 stq $26, 128($sp) /* $26 */ 641 /* Avoid the HAE being gratuitously wrong, to avoid restoring it. */ 642 ldq $2, alpha_mv+HAE_CACHE 643 stq $2, 152($sp) /* HAE */ 644 645 /* Shuffle FLAGS to the front; add CLONE_VM. */ 646 ldi $1, CLONE_VM|CLONE_UNTRACED 647 or $18, $1, $16 648 bsr $26, sys_clone 649 650 /* We don't actually care for a3 success widgetry in the kernel. 651 Not for positive errno values. */ 652 stq $0, 0($sp) /* $0 */ 653 br restore_all 654.end kernel_thread 655 656/* 657 * kernel_execve(path, argv, envp) 658 */ 659 .align 4 660 .globl kernel_execve 661 .ent kernel_execve 662kernel_execve: 663 /* We can be called from a module. */ 664 ldgp $gp, 0($27) 665 lda $sp, -(32+SIZEOF_PT_REGS+8)($sp) 666 .frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0 667 stq $26, 0($sp) 668 stq $16, 8($sp) 669 stq $17, 16($sp) 670 stq $18, 24($sp) 671 .prologue 1 672 673 lda $16, 32($sp) 674 lda $17, 0 675 lda $18, SIZEOF_PT_REGS 676 bsr $26, memset !samegp 677 678 /* Avoid the HAE being gratuitously wrong, which would cause us 679 to do the whole turn off interrupts thing and restore it. */ 680 ldq $2, alpha_mv+HAE_CACHE 681 stq $2, 152+32($sp) 682 683 ldq $16, 8($sp) 684 ldq $17, 16($sp) 685 ldq $18, 24($sp) 686 lda $19, 32($sp) 687 bsr $26, do_execve !samegp 688 689 ldq $26, 0($sp) 690 bne $0, 1f /* error! */ 691 692 /* Move the temporary pt_regs struct from its current location 693 to the top of the kernel stack frame. See copy_thread for 694 details for a normal process. */ 695 lda $16, 0x4000 - SIZEOF_PT_REGS($8) 696 lda $17, 32($sp) 697 lda $18, SIZEOF_PT_REGS 698 bsr $26, memmove !samegp 699 700 /* Take that over as our new stack frame and visit userland! */ 701 lda $sp, 0x4000 - SIZEOF_PT_REGS($8) 702 br $31, ret_from_sys_call 703 7041: lda $sp, 32+SIZEOF_PT_REGS+8($sp) 705 ret 706.end kernel_execve 707 708 709/* 710 * Special system calls. Most of these are special in that they either 711 * have to play switch_stack games or in some way use the pt_regs struct. 712 */ 713 .align 4 714 .globl sys_fork 715 .ent sys_fork 716sys_fork: 717 .prologue 0 718 mov $sp, $21 719 bsr $1, do_switch_stack 720 bis $31, SIGCHLD, $16 721 mov $31, $17 722 mov $31, $18 723 mov $31, $19 724 mov $31, $20 725 jsr $26, alpha_clone 726 bsr $1, undo_switch_stack 727 ret 728.end sys_fork 729 730 .align 4 731 .globl sys_clone 732 .ent sys_clone 733sys_clone: 734 .prologue 0 735 mov $sp, $21 736 bsr $1, do_switch_stack 737 /* $16, $17, $18, $19, $20 come from the user. */ 738 jsr $26, alpha_clone 739 bsr $1, undo_switch_stack 740 ret 741.end sys_clone 742 743 .align 4 744 .globl sys_vfork 745 .ent sys_vfork 746sys_vfork: 747 .prologue 0 748 mov $sp, $16 749 bsr $1, do_switch_stack 750 jsr $26, alpha_vfork 751 bsr $1, undo_switch_stack 752 ret 753.end sys_vfork 754 755 .align 4 756 .globl sys_sigreturn 757 .ent sys_sigreturn 758sys_sigreturn: 759 .prologue 0 760 mov $sp, $17 761 lda $18, -SWITCH_STACK_SIZE($sp) 762 lda $sp, -SWITCH_STACK_SIZE($sp) 763 jsr $26, do_sigreturn 764 br $1, undo_switch_stack 765 br ret_from_sys_call 766.end sys_sigreturn 767 768 .align 4 769 .globl sys_rt_sigreturn 770 .ent sys_rt_sigreturn 771sys_rt_sigreturn: 772 .prologue 0 773 mov $sp, $17 774 lda $18, -SWITCH_STACK_SIZE($sp) 775 lda $sp, -SWITCH_STACK_SIZE($sp) 776 jsr $26, do_rt_sigreturn 777 br $1, undo_switch_stack 778 br ret_from_sys_call 779.end sys_rt_sigreturn 780 781 .align 4 782 .globl sys_sigsuspend 783 .ent sys_sigsuspend 784sys_sigsuspend: 785 .prologue 0 786 mov $sp, $17 787 br $1, do_switch_stack 788 mov $sp, $18 789 subq $sp, 16, $sp 790 stq $26, 0($sp) 791 jsr $26, do_sigsuspend 792 ldq $26, 0($sp) 793 lda $sp, SWITCH_STACK_SIZE+16($sp) 794 ret 795.end sys_sigsuspend 796 797 .align 4 798 .globl sys_rt_sigsuspend 799 .ent sys_rt_sigsuspend 800sys_rt_sigsuspend: 801 .prologue 0 802 mov $sp, $18 803 br $1, do_switch_stack 804 mov $sp, $19 805 subq $sp, 16, $sp 806 stq $26, 0($sp) 807 jsr $26, do_rt_sigsuspend 808 ldq $26, 0($sp) 809 lda $sp, SWITCH_STACK_SIZE+16($sp) 810 ret 811.end sys_rt_sigsuspend 812 813 .align 4 814 .globl sys_sethae 815 .ent sys_sethae 816sys_sethae: 817 .prologue 0 818 stq $16, 152($sp) 819 ret 820.end sys_sethae 821 822 .align 4 823 .globl osf_getpriority 824 .ent osf_getpriority 825osf_getpriority: 826 lda $sp, -16($sp) 827 stq $26, 0($sp) 828 .prologue 0 829 830 jsr $26, sys_getpriority 831 832 ldq $26, 0($sp) 833 blt $0, 1f 834 835 /* Return value is the unbiased priority, i.e. 20 - prio. 836 This does result in negative return values, so signal 837 no error by writing into the R0 slot. */ 838 lda $1, 20 839 stq $31, 16($sp) 840 subl $1, $0, $0 841 unop 842 8431: lda $sp, 16($sp) 844 ret 845.end osf_getpriority 846 847 .align 4 848 .globl sys_getxuid 849 .ent sys_getxuid 850sys_getxuid: 851 .prologue 0 852 ldq $2, TI_TASK($8) 853 ldq $3, TASK_CRED($2) 854 ldl $0, CRED_UID($3) 855 ldl $1, CRED_EUID($3) 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 ldq $3, TASK_CRED($2) 867 ldl $0, CRED_GID($3) 868 ldl $1, CRED_EGID($3) 869 stq $1, 80($sp) 870 ret 871.end sys_getxgid 872 873 .align 4 874 .globl sys_getxpid 875 .ent sys_getxpid 876sys_getxpid: 877 .prologue 0 878 ldq $2, TI_TASK($8) 879 880 /* See linux/kernel/timer.c sys_getppid for discussion 881 about this loop. */ 882 ldq $3, TASK_GROUP_LEADER($2) 883 ldq $4, TASK_REAL_PARENT($3) 884 ldl $0, TASK_TGID($2) 8851: ldl $1, TASK_TGID($4) 886#ifdef CONFIG_SMP 887 mov $4, $5 888 mb 889 ldq $3, TASK_GROUP_LEADER($2) 890 ldq $4, TASK_REAL_PARENT($3) 891 cmpeq $4, $5, $5 892 beq $5, 1b 893#endif 894 stq $1, 80($sp) 895 ret 896.end sys_getxpid 897 898 .align 4 899 .globl sys_alpha_pipe 900 .ent sys_alpha_pipe 901sys_alpha_pipe: 902 lda $sp, -16($sp) 903 stq $26, 0($sp) 904 .prologue 0 905 906 mov $31, $17 907 lda $16, 8($sp) 908 jsr $26, do_pipe_flags 909 910 ldq $26, 0($sp) 911 bne $0, 1f 912 913 /* The return values are in $0 and $20. */ 914 ldl $1, 12($sp) 915 ldl $0, 8($sp) 916 917 stq $1, 80+16($sp) 9181: lda $sp, 16($sp) 919 ret 920.end sys_alpha_pipe 921 922 .align 4 923 .globl sys_execve 924 .ent sys_execve 925sys_execve: 926 .prologue 0 927 mov $sp, $19 928 jmp $31, do_sys_execve 929.end sys_execve 930 931 .align 4 932 .globl osf_sigprocmask 933 .ent osf_sigprocmask 934osf_sigprocmask: 935 .prologue 0 936 mov $sp, $18 937 jmp $31, sys_osf_sigprocmask 938.end osf_sigprocmask 939 940 .align 4 941 .globl alpha_ni_syscall 942 .ent alpha_ni_syscall 943alpha_ni_syscall: 944 .prologue 0 945 /* Special because it also implements overflow handling via 946 syscall number 0. And if you recall, zero is a special 947 trigger for "not an error". Store large non-zero there. */ 948 lda $0, -ENOSYS 949 unop 950 stq $0, 0($sp) 951 ret 952.end alpha_ni_syscall 953