Loading...
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 | /* * alpha/entry.S * * kernel entry-points */ #include <asm/system.h> #define halt .long PAL_halt #define rti .long PAL_rti #define SIGCHLD 20 #define NR_SYSCALLS 320 #define osf_vfork sys_fork /* * These offsets must match with "struct hae" in io.h: */ #define HAE_CACHE 0 #define HAE_REG 8 /* * stack offsets */ #define SP_OFF 160 #define SWITCH_STACK_SIZE 320 /* * task structure offsets */ #define TASK_STATE 0 #define TASK_COUNTER 8 #define TASK_PRIORITY 16 #define TASK_SIGNAL 24 #define TASK_BLOCKED 32 #define TASK_FLAGS 40 /* * task flags (must match include/linux/sched.h): */ #define PF_PTRACED 0x00000010 /* * This defines the normal kernel pt-regs layout. * * regs 9-15 preserved by C code * regs 16-18 saved by PAL-code * regs 29-30 saved and set up by PAL-code */ #define SAVE_ALL \ subq $30,160,$30; \ stq $0,0($30); \ stq $1,8($30); \ stq $2,16($30); \ stq $3,24($30); \ stq $4,32($30); \ stq $5,40($30); \ stq $6,48($30); \ stq $7,56($30); \ stq $8,64($30); \ stq $19,72($30); \ stq $20,80($30); \ stq $21,88($30); \ stq $22,96($30); \ stq $23,104($30); \ stq $24,112($30); \ stq $25,120($30); \ stq $26,128($30); \ stq $27,136($30); \ stq $28,144($30); \ lda $2,hae; \ ldq $2,HAE_CACHE($2); \ stq $2,152($30) #define RESTORE_ALL \ lda $8,hae; \ ldq $7,HAE_CACHE($8); \ ldq $6,152($30); \ subq $7,$6,$5; \ beq $5,99f; \ ldq $7,HAE_REG($8); \ addq $31,7,$16; \ call_pal PAL_swpipl; \ stq $6,HAE_CACHE($8); \ stq $6,0($7); \ mb; \ bis $0,$0,$16; \ call_pal PAL_swpipl; \ 99:; \ ldq $0,0($30); \ ldq $1,8($30); \ ldq $2,16($30); \ ldq $3,24($30); \ ldq $4,32($30); \ ldq $5,40($30); \ ldq $6,48($30); \ ldq $7,56($30); \ ldq $8,64($30); \ ldq $19,72($30); \ ldq $20,80($30); \ ldq $21,88($30); \ ldq $22,96($30); \ ldq $23,104($30); \ ldq $24,112($30); \ ldq $25,120($30); \ ldq $26,128($30); \ ldq $27,136($30); \ ldq $28,144($30); \ addq $30,160,$30 .text .set noat #ifdef __linux__ .set singlegp #endif .align 3 .globl entInt .ent entInt entInt: SAVE_ALL /* start atomic operation with respect to software interrupts */ lda $0,intr_count ldq $1,0($0) addq $1,1,$1 stq $1,0($0) /* set up the arguments to the C interrupt handler */ lda $27,do_entInt jsr $26,($27),do_entInt /* ok, return */ lda $0,intr_count ldq $1,0($0) subq $1,1,$1 stq $1,0($0) br $31,ret_from_sys_call .end entInt .align 3 .globl entMM .ent entMM entMM: SAVE_ALL lda $27,do_page_fault lda $26,ret_from_sys_call jsr $31,($27),do_page_fault .end entMM .align 3 .globl entArith .ent entArith entArith: SAVE_ALL lda $27,do_entArith lda $26,ret_from_sys_call jsr $31,($27),do_entArith .end entArith .align 3 .globl entIF .ent entIF entIF: SAVE_ALL lda $27,do_entIF lda $26,ret_from_sys_call jsr $31,($27),do_entIF .end entIF /* * Fork() is one of the special system calls: it needs to * save the callee-saved regs so that the regs can be found * for the new process.. We save them in the "context switch" * stack format (see arch/alpha/kernel/process.c). * * Also, for the kernel fork, we need to fake the system call * stack buildup, as we can't do system calls from kernel space. */ .align 3 .ent kernel_clone kernel_clone: subq $30,6*8,$30 stq $31,0($30) stq $26,8($30) stq $29,16($30) stq $16,24($30) stq $17,32($30) stq $18,40($30) bis $31,2,$0 /* Register v0: syscall nr for fork() */ SAVE_ALL lda $27,sys_clone jsr $26,($27),sys_clone stq $0,0($30) br $31,ret_from_sys_call .end kernel_clone /* * __kernel_thread(clone_flags, fn, arg) */ .align 3 .globl __kernel_thread .ent __kernel_thread __kernel_thread: subq $30,4*8,$30 stq $9,0($30) stq $10,8($30) stq $26,16($30) bis $17,$17,$9 /* save fn */ bis $18,$18,$10 /* save arg */ bsr $26,kernel_clone bne $20,1f /* $20 is non-zero in child */ ldq $9,0($30) ldq $10,8($30) ldq $26,16($30) addq $30,4*8,$30 ret $31,($26),1 /* this is in child: look out as we don't have any stack here.. */ 1: bis $9,$9,$27 /* get fn */ bis $10,$10,$16 /* get arg */ jsr $26,($27) bis $0,$0,$16 lda $27,sys_exit jsr $26,($27),sys_exit call_pal PAL_halt .end __kernel_thread .align 3 .ent do_switch_stack do_switch_stack: lda $30,-SWITCH_STACK_SIZE($30) stq $9,0($30) stq $10,8($30) stq $11,16($30) stq $12,24($30) stq $13,32($30) stq $14,40($30) stq $15,48($30) stq $26,56($30) stt $f0,64($30) stt $f1,72($30) stt $f2,80($30) stt $f3,88($30) stt $f4,96($30) stt $f5,104($30) stt $f6,112($30) stt $f7,120($30) stt $f8,128($30) stt $f9,136($30) stt $f10,144($30) stt $f11,152($30) stt $f12,160($30) stt $f13,168($30) stt $f14,176($30) stt $f15,184($30) stt $f16,192($30) stt $f17,200($30) stt $f18,208($30) stt $f19,216($30) stt $f20,224($30) stt $f21,232($30) stt $f22,240($30) stt $f23,248($30) stt $f24,256($30) stt $f25,264($30) stt $f26,272($30) stt $f27,280($30) mf_fpcr $f0 # get fpcr stt $f28,288($30) stt $f29,296($30) stt $f30,304($30) stt $f0,312($30) # save fpcr in slot of $f31 ret $31,($1),1 .end do_switch_stack .align 3 .ent undo_switch_stack undo_switch_stack: ldq $9,0($30) ldq $10,8($30) ldq $11,16($30) ldq $12,24($30) ldq $13,32($30) ldq $14,40($30) ldq $15,48($30) ldq $26,56($30) ldt $f30,312($30) # get saved fpcr ldt $f0,64($30) ldt $f1,72($30) ldt $f2,80($30) ldt $f3,88($30) mt_fpcr $f30 # install saved fpcr ldt $f4,96($30) ldt $f5,104($30) ldt $f6,112($30) ldt $f7,120($30) ldt $f8,128($30) ldt $f9,136($30) ldt $f10,144($30) ldt $f11,152($30) ldt $f12,160($30) ldt $f13,168($30) ldt $f14,176($30) ldt $f15,184($30) ldt $f16,192($30) ldt $f17,200($30) ldt $f18,208($30) ldt $f19,216($30) ldt $f20,224($30) ldt $f21,232($30) ldt $f22,240($30) ldt $f23,248($30) ldt $f24,256($30) ldt $f25,264($30) ldt $f26,272($30) ldt $f27,280($30) ldt $f28,288($30) ldt $f29,296($30) ldt $f30,304($30) lda $30,SWITCH_STACK_SIZE($30) ret $31,($1),1 .end undo_switch_stack .align 3 .globl entUna .ent entUna entUna: lda $30,-256($30) stq $0,0($30) ldq $0,256($30) /* get PS */ stq $1,8($30) stq $2,16($30) stq $3,24($30) and $0,8,$0 /* user mode? */ stq $4,32($30) bne $0,entUnaUser /* yup -> do user-level unaligned fault */ stq $5,40($30) stq $6,48($30) stq $7,56($30) stq $8,64($30) stq $9,72($30) stq $10,80($30) stq $11,88($30) stq $12,96($30) stq $13,104($30) stq $14,112($30) stq $15,120($30) /* 16-18 PAL-saved */ stq $19,152($30) stq $20,160($30) stq $21,168($30) stq $22,176($30) stq $23,184($30) stq $24,192($30) stq $25,200($30) stq $26,208($30) stq $27,216($30) stq $28,224($30) stq $29,232($30) stq $30,240($30) stq $31,248($30) lda $27,do_entUna jsr $26,($27),do_entUna ldq $0,0($30) ldq $1,8($30) ldq $2,16($30) ldq $3,24($30) ldq $4,32($30) ldq $5,40($30) ldq $6,48($30) ldq $7,56($30) ldq $8,64($30) ldq $9,72($30) ldq $10,80($30) ldq $11,88($30) ldq $12,96($30) ldq $13,104($30) ldq $14,112($30) ldq $15,120($30) /* 16-18 PAL-saved */ ldq $19,152($30) ldq $20,160($30) ldq $21,168($30) ldq $22,176($30) ldq $23,184($30) ldq $24,192($30) ldq $25,200($30) ldq $26,208($30) ldq $27,216($30) ldq $28,224($30) ldq $29,232($30) ldq $30,240($30) lda $30,256($30) rti .end entUna .align 3 .ent entUnaUser entUnaUser: ldq $0,0($30) /* restore original $0 */ lda $30,256($30) /* pop entUna's stack frame */ SAVE_ALL /* setup normal kernel stack */ lda $30,-56($30) stq $9,0($30) stq $10,8($30) stq $11,16($30) stq $12,24($30) stq $13,32($30) stq $14,40($30) stq $15,48($30) lda $27,do_entUnaUser bis $31,$30,$19 jsr $26,($27),do_entUnaUser ldq $9,0($30) ldq $10,8($30) ldq $11,16($30) ldq $12,24($30) ldq $13,32($30) ldq $14,40($30) ldq $15,48($30) lda $30,56($30) br $31,ret_from_sys_call .end entUnaUser /* * A fork is the same as clone(SIGCHLD, 0); */ .align 3 .globl sys_fork .ent sys_fork sys_fork: br $1,do_switch_stack bis $31,SIGCHLD,$16 bis $31,$31,$17 bis $30,$30,$18 lda $27,alpha_clone jsr $26,($27),alpha_clone br $1,undo_switch_stack ret $31,($26),1 .end sys_fork .align 3 .globl sys_clone .ent sys_clone sys_clone: br $1,do_switch_stack /* arg1 and arg2 come from the user */ bis $30,$30,$18 lda $27,alpha_clone jsr $26,($27),alpha_clone br $1,undo_switch_stack ret $31,($26),1 .end sys_clone .align 3 .globl alpha_switch_to .ent alpha_switch_to alpha_switch_to: br $1,do_switch_stack call_pal PAL_swpctx br $1,undo_switch_stack ret $31,($26),1 .end alpha_switch_to /* * Oh, well.. Disassembling OSF/1 binaries to find out how the * system calls work isn't much fun. * * entSys is special in that the PAL-code doesn't save a0-a2, so * we start off by doing that by hand. */ .align 3 .globl entSys .globl ret_from_sys_call .ent entSys entSys: stq $16,24($30) stq $17,32($30) stq $18,40($30) SAVE_ALL lda $1,NR_SYSCALLS($31) lda $2,sys_call_table lda $27,do_entSys cmpult $0,$1,$1 s8addq $0,$2,$2 beq $1,1f ldq $27,0($2) 1: jsr $26,($27),do_entSys blt $0,syscall_error /* the call failed */ stq $0,0($30) stq $31,72($30) /* a3=0 => no error */ .align 3 ret_from_sys_call: cmovne $26,0,$19 /* $19 = 0 => non-restartable */ /* check bottom half interrupts */ lda $0,intr_count ldq $1,0($0) bne $1,ret_from_handle_bh lda $2,bh_active ldq $3,0($2) lda $2,bh_mask ldq $4,0($2) addq $1,1,$1 and $3,$4,$2 bne $2,handle_bottom_half ret_from_handle_bh: ldq $0,SP_OFF($30) and $0,8,$0 beq $0,restore_all ret_from_reschedule: lda $0,need_resched lda $1,current_set ldl $2,0($0) lda $4,init_task ldq $3,0($1) bne $2,reschedule subq $4,$3,$4 beq $4,restore_all ldq $4,TASK_SIGNAL($3) ldq $16,TASK_BLOCKED($3) bic $4,$16,$4 bne $4,signal_return restore_all: RESTORE_ALL rti .align 3 handle_bottom_half: /* * We're called with $0 containing the address of * 'intr_count' and $1 containing 'intr_count+1' */ stq $1,0($0) /* intr_count = 1 */ subq $30,16,$30 stq $19,0($30) /* save syscall nr */ stq $20,8($30) /* and error indication (a3) */ lda $27,do_bottom_half jsr $26,($27),do_bottom_half lda $0,intr_count ldq $19,0($30) ldq $20,8($30) addq $30,16,$30 stq $31,0($0) /* intr_count = 0 */ br $31,ret_from_handle_bh .align 3 syscall_error: /* * Some system calls (e.g., ptrace) can return arbitrary * values which might normally be mistaken as error numbers. * Those functions must zero $0 (v0) directly in the stack * frame to indicate that a negative return value wasn't an * error number.. */ ldq $19,0($30) /* old syscall nr (zero if success) */ beq $19,ret_success ldq $20,72($30) /* .. and this a3 */ subq $31,$0,$0 /* with error in v0 */ addq $31,1,$1 /* set a3 for errno return */ bis $31,$31,$26 /* tell "ret_from_sys_call" that we can restart */ stq $1,72($30) /* a3 for return */ ret_success: stq $0,0($30) br $31,ret_from_sys_call .align 3 signal_return: bis $30,$30,$17 br $1,do_switch_stack bis $30,$30,$18 lda $27,do_signal jsr $26,($27),do_signal lda $30,SWITCH_STACK_SIZE($30) br $31,restore_all .end entSys .align 3 .ent reschedule reschedule: subq $30,16,$30 stq $19,0($30) /* save syscall nr */ stq $20,8($30) /* and error indication (a3) */ lda $27,schedule jsr $26,($27),schedule ldq $19,0($30) ldq $20,8($30) addq $30,16,$30 br $31,ret_from_reschedule .end reschedule .align 3 .ent sys_sigreturn sys_sigreturn: bis $30,$30,$17 lda $30,-SWITCH_STACK_SIZE($30) bis $30,$30,$18 lda $27,do_sigreturn jsr $26,($27),do_sigreturn br $1,undo_switch_stack br $31,ret_from_sys_call .end sys_sigreturn .align 3 .ent sys_sigsuspend sys_sigsuspend: bis $30,$30,$17 br $1,do_switch_stack bis $30,$30,$18 lda $27,do_sigsuspend jsr $26,($27),do_sigsuspend lda $30,SWITCH_STACK_SIZE($30) br $31,ret_from_sys_call .end sys_sigsuspend .align 3 .globl sys_call_table sys_call_table: /*0*/ .quad do_entSys, sys_exit, sys_fork, sys_read, sys_write .quad do_entSys, sys_close, sys_wait4, do_entSys, sys_link .quad sys_unlink, do_entSys, sys_chdir, sys_fchdir, sys_mknod .quad sys_chmod, sys_chown, sys_brk, do_entSys, sys_lseek .quad sys_getxpid, osf_mount, osf_umount, sys_setuid, sys_getxuid .quad do_entSys, sys_ptrace, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, sys_access, do_entSys .quad do_entSys, sys_sync, sys_kill, do_entSys, sys_setpgid .quad do_entSys, sys_dup, sys_pipe, do_entSys, do_entSys .quad sys_open, do_entSys, sys_getxgid, osf_sigprocmask, do_entSys /*50*/ .quad do_entSys, sys_acct, do_entSys, do_entSys, sys_ioctl .quad do_entSys, do_entSys, sys_symlink, sys_readlink, sys_execve .quad sys_umask, sys_chroot, do_entSys, sys_getpgrp, sys_getpagesize .quad do_entSys, osf_vfork, sys_newstat, sys_newlstat, do_entSys .quad do_entSys, osf_mmap, do_entSys, sys_munmap, sys_mprotect .quad sys_madvise, sys_vhangup, do_entSys, do_entSys, sys_getgroups /* map BSD's setpgrp to sys_setpgid for binary compatibility: */ .quad sys_setgroups, do_entSys, sys_setpgid, sys_setitimer, do_entSys .quad do_entSys, sys_getitimer, sys_gethostname, sys_sethostname, sys_getdtablesize .quad sys_dup2, sys_newfstat, sys_fcntl, sys_select, do_entSys .quad sys_fsync, sys_setpriority, sys_socket, sys_connect, sys_accept /*100*/ .quad sys_getpriority, sys_send, sys_recv, sys_sigreturn, sys_bind .quad sys_setsockopt, sys_listen, do_entSys, do_entSys, do_entSys .quad do_entSys, sys_sigsuspend, do_entSys, do_entSys, do_entSys .quad do_entSys, sys_gettimeofday, sys_getrusage, sys_getsockopt, do_entSys .quad sys_readv, sys_writev, sys_settimeofday, sys_fchown, sys_fchmod .quad sys_recvfrom, sys_setreuid, sys_setregid, sys_rename, sys_truncate .quad sys_ftruncate, do_entSys, sys_setgid, sys_sendto, sys_shutdown .quad sys_socketpair, sys_mkdir, sys_rmdir, sys_utimes, do_entSys .quad do_entSys, sys_getpeername, do_entSys, do_entSys, sys_getrlimit .quad sys_setrlimit, do_entSys, sys_setsid, sys_quotactl, do_entSys /*150*/ .quad sys_getsockname, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, sys_sigaction, do_entSys, do_entSys, osf_getdirentries .quad osf_statfs, osf_fstatfs, do_entSys, do_entSys, do_entSys .quad osf_getdomainname, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, osf_swapon /*200*/ .quad sys_msgctl, sys_msgget, sys_msgrcv, sys_msgsnd, sys_semctl .quad sys_semget, sys_semop, osf_utsname, do_entSys, osf_shmat .quad sys_shmctl, sys_shmdt, sys_shmget, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, sys_getsid .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, osf_proplist_syscall .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys /*250*/ .quad do_entSys, osf_usleep_thread, do_entSys, do_entSys, do_entSys .quad do_entSys, osf_getsysinfo, osf_setsysinfo, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys .quad do_entSys, do_entSys, do_entSys, do_entSys, do_entSys /* linux-specific system calls start at 300 */ /*300*/ .quad sys_bdflush, sys_sethae, sys_mount, sys_adjtimex, sys_swapoff .quad sys_getdents, alpha_create_module, sys_init_module, sys_delete_module, sys_get_kernel_syms .quad sys_syslog, sys_reboot, sys_clone, sys_uselib, sys_mlock .quad sys_munlock, sys_mlockall, sys_munlockall, do_entSys, do_entSys |