1############################################################################### 2# 3# MN10300 Exception and interrupt entry points 4# 5# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd. 6# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. 7# Modified by David Howells (dhowells@redhat.com) 8# 9# This program is free software; you can redistribute it and/or 10# modify it under the terms of the GNU General Public Licence 11# as published by the Free Software Foundation; either version 12# 2 of the Licence, or (at your option) any later version. 13# 14############################################################################### 15#include <linux/sys.h> 16#include <linux/linkage.h> 17#include <asm/smp.h> 18#include <asm/system.h> 19#include <asm/thread_info.h> 20#include <asm/intctl-regs.h> 21#include <asm/busctl-regs.h> 22#include <asm/timer-regs.h> 23#include <unit/leds.h> 24#include <asm/page.h> 25#include <asm/pgtable.h> 26#include <asm/errno.h> 27#include <asm/asm-offsets.h> 28#include <asm/frame.inc> 29 30#ifdef CONFIG_PREEMPT 31#define preempt_stop __cli 32#else 33#define preempt_stop 34#define resume_kernel restore_all 35#endif 36 37 .macro __cli 38 and ~EPSW_IM,epsw 39 or EPSW_IE|MN10300_CLI_LEVEL,epsw 40 nop 41 nop 42 nop 43 .endm 44 .macro __sti 45 or EPSW_IE|EPSW_IM_7,epsw 46 .endm 47 48 49 .am33_2 50 51############################################################################### 52# 53# the return path for a forked child 54# - on entry, D0 holds the address of the previous task to run 55# 56############################################################################### 57ENTRY(ret_from_fork) 58 call schedule_tail[],0 59 GET_THREAD_INFO a2 60 61 # return 0 to indicate child process 62 clr d0 63 mov d0,(REG_D0,fp) 64 jmp syscall_exit 65 66############################################################################### 67# 68# system call handler 69# 70############################################################################### 71ENTRY(system_call) 72 add -4,sp 73 SAVE_ALL 74 mov d0,(REG_ORIG_D0,fp) 75 GET_THREAD_INFO a2 76 cmp nr_syscalls,d0 77 bcc syscall_badsys 78 btst _TIF_SYSCALL_TRACE,(TI_flags,a2) 79 bne syscall_entry_trace 80syscall_call: 81 add d0,d0,a1 82 add a1,a1 83 mov (REG_A0,fp),d0 84 mov (sys_call_table,a1),a0 85 calls (a0) 86 mov d0,(REG_D0,fp) 87syscall_exit: 88 # make sure we don't miss an interrupt setting need_resched or 89 # sigpending between sampling and the rti 90 __cli 91 mov (TI_flags,a2),d2 92 btst _TIF_ALLWORK_MASK,d2 93 bne syscall_exit_work 94restore_all: 95 RESTORE_ALL 96 97############################################################################### 98# 99# perform work that needs to be done immediately before resumption and syscall 100# tracing 101# 102############################################################################### 103 ALIGN 104syscall_exit_work: 105 btst _TIF_SYSCALL_TRACE,d2 106 beq work_pending 107 __sti # could let syscall_trace_exit() call 108 # schedule() instead 109 mov fp,d0 110 call syscall_trace_exit[],0 # do_syscall_trace(regs) 111 jmp resume_userspace 112 113 ALIGN 114work_pending: 115 btst _TIF_NEED_RESCHED,d2 116 beq work_notifysig 117 118work_resched: 119 call schedule[],0 120 121 # make sure we don't miss an interrupt setting need_resched or 122 # sigpending between sampling and the rti 123 __cli 124 125 # is there any work to be done other than syscall tracing? 126 mov (TI_flags,a2),d2 127 btst _TIF_WORK_MASK,d2 128 beq restore_all 129 btst _TIF_NEED_RESCHED,d2 130 bne work_resched 131 132 # deal with pending signals and notify-resume requests 133work_notifysig: 134 mov fp,d0 135 mov d2,d1 136 call do_notify_resume[],0 137 jmp resume_userspace 138 139 # perform syscall entry tracing 140syscall_entry_trace: 141 mov -ENOSYS,d0 142 mov d0,(REG_D0,fp) 143 mov fp,d0 144 call syscall_trace_entry[],0 # returns the syscall number to actually use 145 mov (REG_D1,fp),d1 146 cmp nr_syscalls,d0 147 bcs syscall_call 148 jmp syscall_exit 149 150syscall_badsys: 151 mov -ENOSYS,d0 152 mov d0,(REG_D0,fp) 153 jmp resume_userspace 154 155 # userspace resumption stub bypassing syscall exit tracing 156 .globl ret_from_exception, ret_from_intr 157 ALIGN 158ret_from_exception: 159 preempt_stop 160ret_from_intr: 161 GET_THREAD_INFO a2 162 mov (REG_EPSW,fp),d0 # need to deliver signals before 163 # returning to userspace 164 and EPSW_nSL,d0 165 beq resume_kernel # returning to supervisor mode 166 167ENTRY(resume_userspace) 168 # make sure we don't miss an interrupt setting need_resched or 169 # sigpending between sampling and the rti 170 __cli 171 172 # is there any work to be done on int/exception return? 173 mov (TI_flags,a2),d2 174 btst _TIF_WORK_MASK,d2 175 bne work_pending 176 jmp restore_all 177 178#ifdef CONFIG_PREEMPT 179ENTRY(resume_kernel) 180 __cli 181 mov (TI_preempt_count,a2),d0 # non-zero preempt_count ? 182 cmp 0,d0 183 bne restore_all 184 185need_resched: 186 btst _TIF_NEED_RESCHED,(TI_flags,a2) 187 beq restore_all 188 mov (REG_EPSW,fp),d0 189 and EPSW_IM,d0 190 cmp EPSW_IM_7,d0 # interrupts off (exception path) ? 191 bne restore_all 192 call preempt_schedule_irq[],0 193 jmp need_resched 194#endif 195 196 197############################################################################### 198# 199# IRQ handler entry point 200# - intended to be entered at multiple priorities 201# 202############################################################################### 203ENTRY(irq_handler) 204 add -4,sp 205 SAVE_ALL 206 207 # it's not a syscall 208 mov 0xffffffff,d0 209 mov d0,(REG_ORIG_D0,fp) 210 211 mov fp,d0 212 call do_IRQ[],0 # do_IRQ(regs) 213 214 jmp ret_from_intr 215 216############################################################################### 217# 218# Monitor Signal handler entry point 219# 220############################################################################### 221ENTRY(monitor_signal) 222 movbu (0xae000001),d1 223 cmp 1,d1 224 beq monsignal 225 ret [],0 226 227monsignal: 228 or EPSW_NMID,epsw 229 mov d0,a0 230 mov a0,sp 231 mov (REG_EPSW,fp),d1 232 and ~EPSW_nSL,d1 233 mov d1,(REG_EPSW,fp) 234 movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother] 235 mov (sp),a1 236 mov a1,usp 237 movm (sp),[other] 238 add 4,sp 239here: jmp 0x8e000008-here+0x8e000008 240 241############################################################################### 242# 243# Double Fault handler entry point 244# - note that there will not be a stack, D0/A0 will hold EPSW/PC as were 245# 246############################################################################### 247 .section .bss 248 .balign THREAD_SIZE 249 .space THREAD_SIZE 250__df_stack: 251 .previous 252 253ENTRY(double_fault) 254 mov a0,(__df_stack-4) # PC as was 255 mov d0,(__df_stack-8) # EPSW as was 256 mn10300_set_dbfleds # display 'db-f' on the LEDs 257 mov 0xaa55aa55,d0 258 mov d0,(__df_stack-12) # no ORIG_D0 259 mov sp,a0 # save corrupted SP 260 mov __df_stack-12,sp # emergency supervisor stack 261 SAVE_ALL 262 mov a0,(REG_A0,fp) # save corrupted SP as A0 (which got 263 # clobbered by the CPU) 264 mov fp,d0 265 calls do_double_fault 266double_fault_loop: 267 bra double_fault_loop 268 269############################################################################### 270# 271# Bus Error handler entry point 272# - handle external (async) bus errors separately 273# 274############################################################################### 275ENTRY(raw_bus_error) 276 add -4,sp 277 mov d0,(sp) 278 mov (BCBERR),d0 # what 279 btst BCBERR_BEMR_DMA,d0 # see if it was an external bus error 280 beq __common_exception_aux # it wasn't 281 282 SAVE_ALL 283 mov (BCBEAR),d1 # destination of erroneous access 284 285 mov (REG_ORIG_D0,fp),d2 286 mov d2,(REG_D0,fp) 287 mov -1,d2 288 mov d2,(REG_ORIG_D0,fp) 289 290 add -4,sp 291 mov fp,(12,sp) # frame pointer 292 call io_bus_error[],0 293 jmp restore_all 294 295############################################################################### 296# 297# Miscellaneous exception entry points 298# 299############################################################################### 300ENTRY(nmi_handler) 301 add -4,sp 302 mov d0,(sp) 303 mov (TBR),d0 304 bra __common_exception_nonmi 305 306ENTRY(__common_exception) 307 add -4,sp 308 mov d0,(sp) 309 310__common_exception_aux: 311 mov (TBR),d0 312 and ~EPSW_NMID,epsw # turn NMIs back on if not NMI 313 or EPSW_IE,epsw 314 315__common_exception_nonmi: 316 and 0x0000FFFF,d0 # turn the exception code into a vector 317 # table index 318 319 btst 0x00000007,d0 320 bne 1f 321 cmp 0x00000400,d0 322 bge 1f 323 324 SAVE_ALL # build the stack frame 325 326 mov (REG_D0,fp),a2 # get the exception number 327 mov (REG_ORIG_D0,fp),d0 328 mov d0,(REG_D0,fp) 329 mov -1,d0 330 mov d0,(REG_ORIG_D0,fp) 331 332#ifdef CONFIG_GDBSTUB 333 btst 0x01,(gdbstub_busy) 334 beq 2f 335 and ~EPSW_IE,epsw 336 mov fp,d0 337 mov a2,d1 338 call gdbstub_exception[],0 # gdbstub itself caused an exception 339 bra restore_all 3402: 341#endif 342 343 mov fp,d0 # arg 0: stacked register file 344 mov a2,d1 # arg 1: exception number 345 lsr 1,a2 346 347 mov (exception_table,a2),a2 348 calls (a2) 349 jmp ret_from_exception 350 3511: pi # BUG() equivalent 352 353############################################################################### 354# 355# Exception handler functions table 356# 357############################################################################### 358 .data 359ENTRY(exception_table) 360 .rept 0x400>>1 361 .long uninitialised_exception 362 .endr 363 .previous 364 365############################################################################### 366# 367# Change an entry in the exception table 368# - D0 exception code, D1 handler 369# 370############################################################################### 371ENTRY(set_excp_vector) 372 lsr 1,d0 373 add exception_table,d0 374 mov d1,(d0) 375 mov 4,d1 376#if defined(CONFIG_MN10300_CACHE_WBACK) 377 jmp mn10300_dcache_flush_inv_range2 378#else 379 ret [],0 380#endif 381 382############################################################################### 383# 384# System call table 385# 386############################################################################### 387 .data 388ENTRY(sys_call_table) 389 .long sys_restart_syscall /* 0 */ 390 .long sys_exit 391 .long sys_fork 392 .long sys_read 393 .long sys_write 394 .long sys_open /* 5 */ 395 .long sys_close 396 .long sys_waitpid 397 .long sys_creat 398 .long sys_link 399 .long sys_unlink /* 10 */ 400 .long sys_execve 401 .long sys_chdir 402 .long sys_time 403 .long sys_mknod 404 .long sys_chmod /* 15 */ 405 .long sys_lchown16 406 .long sys_ni_syscall /* old break syscall holder */ 407 .long sys_stat 408 .long sys_lseek 409 .long sys_getpid /* 20 */ 410 .long sys_mount 411 .long sys_oldumount 412 .long sys_setuid16 413 .long sys_getuid16 414 .long sys_stime /* 25 */ 415 .long sys_ptrace 416 .long sys_alarm 417 .long sys_fstat 418 .long sys_pause 419 .long sys_utime /* 30 */ 420 .long sys_ni_syscall /* old stty syscall holder */ 421 .long sys_ni_syscall /* old gtty syscall holder */ 422 .long sys_access 423 .long sys_nice 424 .long sys_ni_syscall /* 35 - old ftime syscall holder */ 425 .long sys_sync 426 .long sys_kill 427 .long sys_rename 428 .long sys_mkdir 429 .long sys_rmdir /* 40 */ 430 .long sys_dup 431 .long sys_pipe 432 .long sys_times 433 .long sys_ni_syscall /* old prof syscall holder */ 434 .long sys_brk /* 45 */ 435 .long sys_setgid16 436 .long sys_getgid16 437 .long sys_signal 438 .long sys_geteuid16 439 .long sys_getegid16 /* 50 */ 440 .long sys_acct 441 .long sys_umount /* recycled never used phys() */ 442 .long sys_ni_syscall /* old lock syscall holder */ 443 .long sys_ioctl 444 .long sys_fcntl /* 55 */ 445 .long sys_ni_syscall /* old mpx syscall holder */ 446 .long sys_setpgid 447 .long sys_ni_syscall /* old ulimit syscall holder */ 448 .long sys_ni_syscall /* old sys_olduname */ 449 .long sys_umask /* 60 */ 450 .long sys_chroot 451 .long sys_ustat 452 .long sys_dup2 453 .long sys_getppid 454 .long sys_getpgrp /* 65 */ 455 .long sys_setsid 456 .long sys_sigaction 457 .long sys_sgetmask 458 .long sys_ssetmask 459 .long sys_setreuid16 /* 70 */ 460 .long sys_setregid16 461 .long sys_sigsuspend 462 .long sys_sigpending 463 .long sys_sethostname 464 .long sys_setrlimit /* 75 */ 465 .long sys_old_getrlimit 466 .long sys_getrusage 467 .long sys_gettimeofday 468 .long sys_settimeofday 469 .long sys_getgroups16 /* 80 */ 470 .long sys_setgroups16 471 .long sys_old_select 472 .long sys_symlink 473 .long sys_lstat 474 .long sys_readlink /* 85 */ 475 .long sys_uselib 476 .long sys_swapon 477 .long sys_reboot 478 .long sys_old_readdir 479 .long old_mmap /* 90 */ 480 .long sys_munmap 481 .long sys_truncate 482 .long sys_ftruncate 483 .long sys_fchmod 484 .long sys_fchown16 /* 95 */ 485 .long sys_getpriority 486 .long sys_setpriority 487 .long sys_ni_syscall /* old profil syscall holder */ 488 .long sys_statfs 489 .long sys_fstatfs /* 100 */ 490 .long sys_ni_syscall /* ioperm */ 491 .long sys_socketcall 492 .long sys_syslog 493 .long sys_setitimer 494 .long sys_getitimer /* 105 */ 495 .long sys_newstat 496 .long sys_newlstat 497 .long sys_newfstat 498 .long sys_ni_syscall /* old sys_uname */ 499 .long sys_ni_syscall /* 110 - iopl */ 500 .long sys_vhangup 501 .long sys_ni_syscall /* old "idle" system call */ 502 .long sys_ni_syscall /* vm86old */ 503 .long sys_wait4 504 .long sys_swapoff /* 115 */ 505 .long sys_sysinfo 506 .long sys_ipc 507 .long sys_fsync 508 .long sys_sigreturn 509 .long sys_clone /* 120 */ 510 .long sys_setdomainname 511 .long sys_newuname 512 .long sys_ni_syscall /* modify_ldt */ 513 .long sys_adjtimex 514 .long sys_mprotect /* 125 */ 515 .long sys_sigprocmask 516 .long sys_ni_syscall /* old "create_module" */ 517 .long sys_init_module 518 .long sys_delete_module 519 .long sys_ni_syscall /* 130: old "get_kernel_syms" */ 520 .long sys_quotactl 521 .long sys_getpgid 522 .long sys_fchdir 523 .long sys_bdflush 524 .long sys_sysfs /* 135 */ 525 .long sys_personality 526 .long sys_ni_syscall /* reserved for afs_syscall */ 527 .long sys_setfsuid16 528 .long sys_setfsgid16 529 .long sys_llseek /* 140 */ 530 .long sys_getdents 531 .long sys_select 532 .long sys_flock 533 .long sys_msync 534 .long sys_readv /* 145 */ 535 .long sys_writev 536 .long sys_getsid 537 .long sys_fdatasync 538 .long sys_sysctl 539 .long sys_mlock /* 150 */ 540 .long sys_munlock 541 .long sys_mlockall 542 .long sys_munlockall 543 .long sys_sched_setparam 544 .long sys_sched_getparam /* 155 */ 545 .long sys_sched_setscheduler 546 .long sys_sched_getscheduler 547 .long sys_sched_yield 548 .long sys_sched_get_priority_max 549 .long sys_sched_get_priority_min /* 160 */ 550 .long sys_sched_rr_get_interval 551 .long sys_nanosleep 552 .long sys_mremap 553 .long sys_setresuid16 554 .long sys_getresuid16 /* 165 */ 555 .long sys_ni_syscall /* vm86 */ 556 .long sys_ni_syscall /* Old sys_query_module */ 557 .long sys_poll 558 .long sys_nfsservctl 559 .long sys_setresgid16 /* 170 */ 560 .long sys_getresgid16 561 .long sys_prctl 562 .long sys_rt_sigreturn 563 .long sys_rt_sigaction 564 .long sys_rt_sigprocmask /* 175 */ 565 .long sys_rt_sigpending 566 .long sys_rt_sigtimedwait 567 .long sys_rt_sigqueueinfo 568 .long sys_rt_sigsuspend 569 .long sys_pread64 /* 180 */ 570 .long sys_pwrite64 571 .long sys_chown16 572 .long sys_getcwd 573 .long sys_capget 574 .long sys_capset /* 185 */ 575 .long sys_sigaltstack 576 .long sys_sendfile 577 .long sys_ni_syscall /* reserved for streams1 */ 578 .long sys_ni_syscall /* reserved for streams2 */ 579 .long sys_vfork /* 190 */ 580 .long sys_getrlimit 581 .long sys_mmap_pgoff 582 .long sys_truncate64 583 .long sys_ftruncate64 584 .long sys_stat64 /* 195 */ 585 .long sys_lstat64 586 .long sys_fstat64 587 .long sys_lchown 588 .long sys_getuid 589 .long sys_getgid /* 200 */ 590 .long sys_geteuid 591 .long sys_getegid 592 .long sys_setreuid 593 .long sys_setregid 594 .long sys_getgroups /* 205 */ 595 .long sys_setgroups 596 .long sys_fchown 597 .long sys_setresuid 598 .long sys_getresuid 599 .long sys_setresgid /* 210 */ 600 .long sys_getresgid 601 .long sys_chown 602 .long sys_setuid 603 .long sys_setgid 604 .long sys_setfsuid /* 215 */ 605 .long sys_setfsgid 606 .long sys_pivot_root 607 .long sys_mincore 608 .long sys_madvise 609 .long sys_getdents64 /* 220 */ 610 .long sys_fcntl64 611 .long sys_ni_syscall /* reserved for TUX */ 612 .long sys_ni_syscall 613 .long sys_gettid 614 .long sys_readahead /* 225 */ 615 .long sys_setxattr 616 .long sys_lsetxattr 617 .long sys_fsetxattr 618 .long sys_getxattr 619 .long sys_lgetxattr /* 230 */ 620 .long sys_fgetxattr 621 .long sys_listxattr 622 .long sys_llistxattr 623 .long sys_flistxattr 624 .long sys_removexattr /* 235 */ 625 .long sys_lremovexattr 626 .long sys_fremovexattr 627 .long sys_tkill 628 .long sys_sendfile64 629 .long sys_futex /* 240 */ 630 .long sys_sched_setaffinity 631 .long sys_sched_getaffinity 632 .long sys_ni_syscall /* sys_set_thread_area */ 633 .long sys_ni_syscall /* sys_get_thread_area */ 634 .long sys_io_setup /* 245 */ 635 .long sys_io_destroy 636 .long sys_io_getevents 637 .long sys_io_submit 638 .long sys_io_cancel 639 .long sys_fadvise64 /* 250 */ 640 .long sys_ni_syscall 641 .long sys_exit_group 642 .long sys_lookup_dcookie 643 .long sys_epoll_create 644 .long sys_epoll_ctl /* 255 */ 645 .long sys_epoll_wait 646 .long sys_remap_file_pages 647 .long sys_set_tid_address 648 .long sys_timer_create 649 .long sys_timer_settime /* 260 */ 650 .long sys_timer_gettime 651 .long sys_timer_getoverrun 652 .long sys_timer_delete 653 .long sys_clock_settime 654 .long sys_clock_gettime /* 265 */ 655 .long sys_clock_getres 656 .long sys_clock_nanosleep 657 .long sys_statfs64 658 .long sys_fstatfs64 659 .long sys_tgkill /* 270 */ 660 .long sys_utimes 661 .long sys_fadvise64_64 662 .long sys_ni_syscall /* sys_vserver */ 663 .long sys_mbind 664 .long sys_get_mempolicy /* 275 */ 665 .long sys_set_mempolicy 666 .long sys_mq_open 667 .long sys_mq_unlink 668 .long sys_mq_timedsend 669 .long sys_mq_timedreceive /* 280 */ 670 .long sys_mq_notify 671 .long sys_mq_getsetattr 672 .long sys_kexec_load 673 .long sys_waitid 674 .long sys_ni_syscall /* 285 */ /* available */ 675 .long sys_add_key 676 .long sys_request_key 677 .long sys_keyctl 678 .long sys_cacheflush 679 .long sys_ioprio_set /* 290 */ 680 .long sys_ioprio_get 681 .long sys_inotify_init 682 .long sys_inotify_add_watch 683 .long sys_inotify_rm_watch 684 .long sys_migrate_pages /* 295 */ 685 .long sys_openat 686 .long sys_mkdirat 687 .long sys_mknodat 688 .long sys_fchownat 689 .long sys_futimesat /* 300 */ 690 .long sys_fstatat64 691 .long sys_unlinkat 692 .long sys_renameat 693 .long sys_linkat 694 .long sys_symlinkat /* 305 */ 695 .long sys_readlinkat 696 .long sys_fchmodat 697 .long sys_faccessat 698 .long sys_pselect6 699 .long sys_ppoll /* 310 */ 700 .long sys_unshare 701 .long sys_set_robust_list 702 .long sys_get_robust_list 703 .long sys_splice 704 .long sys_sync_file_range /* 315 */ 705 .long sys_tee 706 .long sys_vmsplice 707 .long sys_move_pages 708 .long sys_getcpu 709 .long sys_epoll_pwait /* 320 */ 710 .long sys_utimensat 711 .long sys_signalfd 712 .long sys_timerfd_create 713 .long sys_eventfd 714 .long sys_fallocate /* 325 */ 715 .long sys_timerfd_settime 716 .long sys_timerfd_gettime 717 .long sys_signalfd4 718 .long sys_eventfd2 719 .long sys_epoll_create1 /* 330 */ 720 .long sys_dup3 721 .long sys_pipe2 722 .long sys_inotify_init1 723 .long sys_preadv 724 .long sys_pwritev /* 335 */ 725 .long sys_rt_tgsigqueueinfo 726 .long sys_perf_event_open 727 .long sys_recvmmsg 728 729 730nr_syscalls=(.-sys_call_table)/4 731