| blob | 6615e4838ee4cab03a4a72a552347ae768f38273 |
1 /* $Id: entry.S,v 1.37 2004/06/11 13:02:46 doyu Exp $
2 *
3 * linux/arch/sh/entry.S
4 *
5 * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
6 * Copyright (C) 2003 Paul Mundt
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 *
12 */
14 #include <linux/sys.h>
15 #include <linux/linkage.h>
16 #include <linux/config.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/thread_info.h>
19 #include <asm/unistd.h>
21 #if !defined(CONFIG_NFSD) && !defined(CONFIG_NFSD_MODULE)
22 #define sys_nfsservctl sys_ni_syscall
23 #endif
25 #if !defined(CONFIG_MMU)
26 #define sys_madvise sys_ni_syscall
27 #define sys_readahead sys_ni_syscall
28 #define sys_mprotect sys_ni_syscall
29 #define sys_msync sys_ni_syscall
30 #define sys_mlock sys_ni_syscall
31 #define sys_munlock sys_ni_syscall
32 #define sys_mlockall sys_ni_syscall
33 #define sys_munlockall sys_ni_syscall
34 #define sys_mremap sys_ni_syscall
35 #define sys_mincore sys_ni_syscall
36 #define sys_remap_file_pages sys_ni_syscall
37 #endif
39 ! NOTE:
40 ! GNU as (as of 2.9.1) changes bf/s into bt/s and bra, when the address
41 ! to be jumped is too far, but it causes illegal slot exception.
43 /*
44 * entry.S contains the system-call and fault low-level handling routines.
45 * This also contains the timer-interrupt handler, as well as all interrupts
46 * and faults that can result in a task-switch.
47 *
48 * NOTE: This code handles signal-recognition, which happens every time
49 * after a timer-interrupt and after each system call.
50 *
51 * NOTE: This code uses a convention that instructions in the delay slot
52 * of a transfer-control instruction are indented by an extra space, thus:
53 *
54 * jmp @k0 ! control-transfer instruction
55 * ldc k1, ssr ! delay slot
56 *
57 * Stack layout in 'ret_from_syscall':
58 * ptrace needs to have all regs on the stack.
59 * if the order here is changed, it needs to be
60 * updated in ptrace.c and ptrace.h
61 *
62 * r0
63 * ...
64 * r15 = stack pointer
65 * spc
66 * pr
67 * ssr
68 * gbr
69 * mach
70 * macl
71 * syscall #
72 *
73 */
75 ENOSYS = 38
76 EINVAL = 22
78 #if defined(CONFIG_CPU_SH3)
79 TRA = 0xffffffd0
80 EXPEVT = 0xffffffd4
81 #if defined(CONFIG_CPU_SUBTYPE_SH7707) || defined(CONFIG_CPU_SUBTYPE_SH7709) || \
82 defined(CONFIG_CPU_SUBTYPE_SH7300) || defined(CONFIG_CPU_SUBTYPE_SH7705)
83 INTEVT = 0xa4000000 ! INTEVTE2(0xa4000000)
84 #else
85 INTEVT = 0xffffffd8
86 #endif
87 MMU_TEA = 0xfffffffc ! TLB Exception Address Register
88 #elif defined(CONFIG_CPU_SH4)
89 TRA = 0xff000020
90 EXPEVT = 0xff000024
91 INTEVT = 0xff000028
92 MMU_TEA = 0xff00000c ! TLB Exception Address Register
93 #endif
95 #if defined(CONFIG_KGDB_NMI)
96 NMI_VEC = 0x1c0 ! Must catch early for debounce
97 #endif
99 /* Offsets to the stack */
100 OFF_R0 = 0 /* Return value. New ABI also arg4 */
101 OFF_R1 = 4 /* New ABI: arg5 */
102 OFF_R2 = 8 /* New ABI: arg6 */
103 OFF_R3 = 12 /* New ABI: syscall_nr */
104 OFF_R4 = 16 /* New ABI: arg0 */
105 OFF_R5 = 20 /* New ABI: arg1 */
106 OFF_R6 = 24 /* New ABI: arg2 */
107 OFF_R7 = 28 /* New ABI: arg3 */
108 OFF_SP = (15*4)
109 OFF_PC = (16*4)
110 OFF_SR = (16*4+8)
111 OFF_TRA = (16*4+6*4)
114 #define k0 r0
115 #define k1 r1
116 #define k2 r2
117 #define k3 r3
118 #define k4 r4
120 #define k_ex_code r2_bank /* r2_bank1 */
121 #define g_imask r6 /* r6_bank1 */
122 #define k_g_imask r6_bank /* r6_bank1 */
123 #define current r7 /* r7_bank1 */
125 /*
126 * Kernel mode register usage:
127 * k0 scratch
128 * k1 scratch
129 * k2 scratch (Exception code)
130 * k3 scratch (Return address)
131 * k4 scratch
132 * k5 reserved
133 * k6 Global Interrupt Mask (0--15 << 4)
134 * k7 CURRENT_THREAD_INFO (pointer to current thread info)
135 */
137 !
138 ! TLB Miss / Initial Page write exception handling
139 ! _and_
140 ! TLB hits, but the access violate the protection.
141 ! It can be valid access, such as stack grow and/or C-O-W.
142 !
143 !
144 ! Find the pmd/pte entry and loadtlb
145 ! If it's not found, cause address error (SEGV)
146 !
147 ! Although this could be written in assembly language (and it'd be faster),
148 ! this first version depends *much* on C implementation.
149 !
151 #define CLI() \
152 stc sr, r0; \
153 or #0xf0, r0; \
154 ldc r0, sr
156 #define STI() \
157 mov.l __INV_IMASK, r11; \
158 stc sr, r10; \
159 and r11, r10; \
160 stc k_g_imask, r11; \
161 or r11, r10; \
162 ldc r10, sr
164 #if defined(CONFIG_PREEMPT)
165 # define preempt_stop() CLI()
166 #else
167 # define preempt_stop()
168 # define resume_kernel restore_all
169 #endif
171 #if defined(CONFIG_MMU)
172 .align 2
173 ENTRY(tlb_miss_load)
174 bra call_dpf
175 mov #0, r5
177 .align 2
178 ENTRY(tlb_miss_store)
179 bra call_dpf
180 mov #1, r5
182 .align 2
183 ENTRY(initial_page_write)
184 bra call_dpf
185 mov #1, r5
187 .align 2
188 ENTRY(tlb_protection_violation_load)
189 bra call_dpf
190 mov #0, r5
192 .align 2
193 ENTRY(tlb_protection_violation_store)
194 bra call_dpf
195 mov #1, r5
197 call_dpf:
198 mov.l 1f, r0
199 mov r5, r8
200 mov.l @r0, r6
201 mov r6, r9
202 mov.l 2f, r0
203 sts pr, r10
204 jsr @r0
205 mov r15, r4
206 !
207 tst r0, r0
208 bf/s 0f
209 lds r10, pr
210 rts
211 nop
212 0: STI()
213 mov.l 3f, r0
214 mov r9, r6
215 mov r8, r5
216 jmp @r0
217 mov r15, r4
219 .align 2
220 1: .long MMU_TEA
221 2: .long __do_page_fault
222 3: .long do_page_fault
224 .align 2
225 ENTRY(address_error_load)
226 bra call_dae
227 mov #0,r5 ! writeaccess = 0
229 .align 2
230 ENTRY(address_error_store)
231 bra call_dae
232 mov #1,r5 ! writeaccess = 1
234 .align 2
235 call_dae:
236 mov.l 1f, r0
237 mov.l @r0, r6 ! address
238 mov.l 2f, r0
239 jmp @r0
240 mov r15, r4 ! regs
242 .align 2
243 1: .long MMU_TEA
244 2: .long do_address_error
245 #endif /* CONFIG_MMU */
247 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
248 ! Handle kernel debug if either kgdb (SW) or gdb-stub (FW) is present.
249 ! If both are configured, handle the debug traps (breakpoints) in SW,
250 ! but still allow BIOS traps to FW.
252 .align 2
253 debug_kernel:
254 #if defined(CONFIG_SH_STANDARD_BIOS) && defined(CONFIG_SH_KGDB)
255 /* Force BIOS call to FW (debug_trap put TRA in r8) */
256 mov r8,r0
257 shlr2 r0
258 cmp/eq #0x3f,r0
259 bt debug_kernel_fw
260 #endif /* CONFIG_SH_STANDARD_BIOS && CONFIG_SH_KGDB */
262 debug_enter:
263 #if defined(CONFIG_SH_KGDB)
264 /* Jump to kgdb, pass stacked regs as arg */
265 debug_kernel_sw:
266 mov.l 3f, r0
267 jmp @r0
268 mov r15, r4
269 .align 2
270 3: .long kgdb_handle_exception
271 #endif /* CONFIG_SH_KGDB */
273 #if defined(CONFIG_SH_STANDARD_BIOS)
274 /* Unwind the stack and jmp to the debug entry */
275 debug_kernel_fw:
276 mov.l @r15+, r0
277 mov.l @r15+, r1
278 mov.l @r15+, r2
279 mov.l @r15+, r3
280 mov.l @r15+, r4
281 mov.l @r15+, r5
282 mov.l @r15+, r6
283 mov.l @r15+, r7
284 stc sr, r8
285 mov.l 1f, r9 ! BL =1, RB=1, IMASK=0x0F
286 or r9, r8
287 ldc r8, sr ! here, change the register bank
288 mov.l @r15+, r8
289 mov.l @r15+, r9
290 mov.l @r15+, r10
291 mov.l @r15+, r11
292 mov.l @r15+, r12
293 mov.l @r15+, r13
294 mov.l @r15+, r14
295 mov.l @r15+, k0
296 ldc.l @r15+, spc
297 lds.l @r15+, pr
298 mov.l @r15+, k1
299 ldc.l @r15+, gbr
300 lds.l @r15+, mach
301 lds.l @r15+, macl
302 mov k0, r15
303 !
304 mov.l 2f, k0
305 mov.l @k0, k0
306 jmp @k0
307 ldc k1, ssr
308 .align 2
309 1: .long 0x300000f0
310 2: .long gdb_vbr_vector
311 #endif /* CONFIG_SH_STANDARD_BIOS */
313 #endif /* CONFIG_SH_STANDARD_BIOS || CONFIG_SH_KGDB */
316 .align 2
317 debug_trap:
318 #if defined(CONFIG_SH_STANDARD_BIOS) || defined(CONFIG_SH_KGDB)
319 mov #OFF_SR, r0
320 mov.l @(r0,r15), r0 ! get status register
321 shll r0
322 shll r0 ! kernel space?
323 bt/s debug_kernel
324 #endif
325 mov.l @r15, r0 ! Restore R0 value
326 mov.l 1f, r8
327 jmp @r8
328 nop
330 .align 2
331 ENTRY(exception_error)
332 !
333 STI()
334 mov.l 2f, r0
335 jmp @r0
336 nop
338 !
339 .align 2
340 1: .long break_point_trap_software
341 2: .long do_exception_error
343 .align 2
344 ret_from_exception:
345 preempt_stop()
346 ret_from_irq:
347 !
348 mov #OFF_SR, r0
349 mov.l @(r0,r15), r0 ! get status register
350 shll r0
351 shll r0 ! kernel space?
352 bt/s resume_kernel ! Yes, it's from kernel, go back soon
353 GET_THREAD_INFO(r8)
355 #ifdef CONFIG_PREEMPT
356 bra resume_userspace
357 nop
358 ENTRY(resume_kernel)
359 mov.l @(TI_PRE_COUNT,r8), r0 ! current_thread_info->preempt_count
360 tst r0, r0
361 bf noresched
362 need_resched:
363 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
364 tst #_TIF_NEED_RESCHED, r0 ! need_resched set?
365 bt noresched
367 mov #OFF_SR, r0
368 mov.l @(r0,r15), r0 ! get status register
369 and #0xf0, r0 ! interrupts off (exception path)?
370 cmp/eq #0xf0, r0
371 bt noresched
373 mov.l 1f, r0
374 mov.l r0, @(TI_PRE_COUNT,r8)
376 STI()
377 mov.l 2f, r0
378 jsr @r0
379 nop
380 mov #0, r0
381 mov.l r0, @(TI_PRE_COUNT,r8)
382 CLI()
384 bra need_resched
385 nop
386 noresched:
387 bra restore_all
388 nop
390 .align 2
391 1: .long PREEMPT_ACTIVE
392 2: .long schedule
393 #endif
395 ENTRY(resume_userspace)
396 ! r8: current_thread_info
397 CLI()
398 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
399 tst #_TIF_WORK_MASK, r0
400 bt/s restore_all
401 tst #_TIF_NEED_RESCHED, r0
403 .align 2
404 work_pending:
405 ! r0: current_thread_info->flags
406 ! r8: current_thread_info
407 ! t: result of "tst #_TIF_NEED_RESCHED, r0"
408 bf/s work_resched
409 tst #_TIF_SIGPENDING, r0
410 work_notifysig:
411 bt/s restore_all
412 mov r15, r4
413 mov #0, r5
414 mov.l 2f, r1
415 mova restore_all, r0
416 jmp @r1
417 lds r0, pr
418 work_resched:
419 #ifndef CONFIG_PREEMPT
420 ! gUSA handling
421 mov.l @(OFF_SP,r15), r0 ! get user space stack pointer
422 mov r0, r1
423 shll r0
424 bf/s 1f
425 shll r0
426 bf/s 1f
427 mov #OFF_PC, r0
428 ! SP >= 0xc0000000 : gUSA mark
429 mov.l @(r0,r15), r2 ! get user space PC (program counter)
430 mov.l @(OFF_R0,r15), r3 ! end point
431 cmp/hs r3, r2 ! r2 >= r3?
432 bt 1f
433 add r3, r1 ! rewind point #2
434 mov.l r1, @(r0,r15) ! reset PC to rewind point #2
435 !
436 1:
437 #endif
438 mov.l 1f, r1
439 jsr @r1 ! schedule
440 nop
441 CLI()
442 !
443 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
444 tst #_TIF_WORK_MASK, r0
445 bt restore_all
446 bra work_pending
447 tst #_TIF_NEED_RESCHED, r0
449 .align 2
450 1: .long schedule
451 2: .long do_signal
453 .align 2
454 syscall_exit_work:
455 ! r0: current_thread_info->flags
456 ! r8: current_thread_info
457 tst #_TIF_SYSCALL_TRACE, r0
458 bt/s work_pending
459 tst #_TIF_NEED_RESCHED, r0
460 STI()
461 ! XXX setup arguments...
462 mov.l 4f, r0 ! do_syscall_trace
463 jsr @r0
464 nop
465 bra resume_userspace
466 nop
468 .align 2
469 syscall_trace_entry:
470 ! Yes it is traced.
471 ! XXX setup arguments...
472 mov.l 4f, r11 ! Call do_syscall_trace which notifies
473 jsr @r11 ! superior (will chomp R[0-7])
474 nop
475 ! Reload R0-R4 from kernel stack, where the
476 ! parent may have modified them using
477 ! ptrace(POKEUSR). (Note that R0-R2 are
478 ! used by the system call handler directly
479 ! from the kernel stack anyway, so don't need
480 ! to be reloaded here.) This allows the parent
481 ! to rewrite system calls and args on the fly.
482 mov.l @(OFF_R4,r15), r4 ! arg0
483 mov.l @(OFF_R5,r15), r5
484 mov.l @(OFF_R6,r15), r6
485 mov.l @(OFF_R7,r15), r7 ! arg3
486 mov.l @(OFF_R3,r15), r3 ! syscall_nr
487 ! Arrange for do_syscall_trace to be called
488 ! again as the system call returns.
489 mov.l 2f, r10 ! Number of syscalls
490 cmp/hs r10, r3
491 bf syscall_call
492 mov #-ENOSYS, r0
493 bra syscall_exit
494 mov.l r0, @(OFF_R0,r15) ! Return value
496 /*
497 * Syscall interface:
498 *
499 * Syscall #: R3
500 * Arguments #0 to #3: R4--R7
501 * Arguments #4 to #6: R0, R1, R2
502 * TRA: (number of arguments + 0x10) x 4
503 *
504 * This code also handles delegating other traps to the BIOS/gdb stub
505 * according to:
506 *
507 * Trap number
508 * (TRA>>2) Purpose
509 * -------- -------
510 * 0x0-0xf old syscall ABI
511 * 0x10-0x1f new syscall ABI
512 * 0x20-0xff delegated through debug_trap to BIOS/gdb stub.
513 *
514 * Note: When we're first called, the TRA value must be shifted
515 * right 2 bits in order to get the value that was used as the "trapa"
516 * argument.
517 */
519 .align 2
520 .globl ret_from_fork
521 ret_from_fork:
522 mov.l 1f, r8
523 jsr @r8
524 mov r0, r4
525 bra syscall_exit
526 nop
527 .align 2
528 1: .long schedule_tail
529 !
530 ENTRY(system_call)
531 mov.l 1f, r9
532 mov.l @r9, r8 ! Read from TRA (Trap Address) Register
533 !
534 ! Is the trap argument >= 0x20? (TRA will be >= 0x80)
535 mov #0x7f, r9
536 cmp/hi r9, r8
537 bt/s 0f
538 mov #OFF_TRA, r9
539 add r15, r9
540 !
541 mov.l r8, @r9 ! set TRA value to tra
542 STI()
543 ! Call the system call handler through the table.
544 ! First check for bad syscall number
545 mov r3, r9
546 mov.l 2f, r8 ! Number of syscalls
547 cmp/hs r8, r9
548 bf/s good_system_call
549 GET_THREAD_INFO(r8)
550 syscall_badsys: ! Bad syscall number
551 mov #-ENOSYS, r0
552 bra resume_userspace
553 mov.l r0, @(OFF_R0,r15) ! Return value
554 !
555 0:
556 bra debug_trap
557 nop
558 !
559 good_system_call: ! Good syscall number
560 mov.l @(TI_FLAGS,r8), r8
561 mov #_TIF_SYSCALL_TRACE, r10
562 tst r10, r8
563 bf syscall_trace_entry
564 !
565 syscall_call:
566 shll2 r9 ! x4
567 mov.l 3f, r8 ! Load the address of sys_call_table
568 add r8, r9
569 mov.l @r9, r8
570 jsr @r8 ! jump to specific syscall handler
571 nop
572 mov.l r0, @(OFF_R0,r15) ! save the return value
573 !
574 syscall_exit:
575 CLI()
576 !
577 GET_THREAD_INFO(r8)
578 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
579 tst #_TIF_ALLWORK_MASK, r0
580 bf syscall_exit_work
581 restore_all:
582 mov.l @r15+, r0
583 mov.l @r15+, r1
584 mov.l @r15+, r2
585 mov.l @r15+, r3
586 mov.l @r15+, r4
587 mov.l @r15+, r5
588 mov.l @r15+, r6
589 mov.l @r15+, r7
590 !
591 stc sr, r8
592 mov.l 7f, r9
593 or r9, r8 ! BL =1, RB=1
594 ldc r8, sr ! here, change the register bank
595 !
596 mov.l @r15+, r8
597 mov.l @r15+, r9
598 mov.l @r15+, r10
599 mov.l @r15+, r11
600 mov.l @r15+, r12
601 mov.l @r15+, r13
602 mov.l @r15+, r14
603 mov.l @r15+, k4 ! original stack pointer
604 ldc.l @r15+, spc
605 lds.l @r15+, pr
606 mov.l @r15+, k3 ! original SR
607 ldc.l @r15+, gbr
608 lds.l @r15+, mach
609 lds.l @r15+, macl
610 add #4, r15 ! Skip syscall number
611 !
612 #ifdef CONFIG_SH_DSP
613 mov.l @r15+, k0 ! DSP mode marker
614 mov.l 5f, k1
615 cmp/eq k0, k1 ! Do we have a DSP stack frame?
616 bf skip_restore
618 stc sr, k0 ! Enable CPU DSP mode
619 or k1, k0 ! (within kernel it may be disabled)
620 ldc k0, sr
621 mov r2, k0 ! Backup r2
623 ! Restore DSP registers from stack
624 mov r15, r2
625 movs.l @r2+, a1
626 movs.l @r2+, a0g
627 movs.l @r2+, a1g
628 movs.l @r2+, m0
629 movs.l @r2+, m1
630 mov r2, r15
632 lds.l @r15+, a0
633 lds.l @r15+, x0
634 lds.l @r15+, x1
635 lds.l @r15+, y0
636 lds.l @r15+, y1
637 lds.l @r15+, dsr
638 ldc.l @r15+, rs
639 ldc.l @r15+, re
640 ldc.l @r15+, mod
642 mov k0, r2 ! Restore r2
643 skip_restore:
644 #endif
645 !
646 ! Calculate new SR value
647 mov k3, k2 ! original SR value
648 mov.l 9f, k1
649 and k1, k2 ! Mask orignal SR value
650 !
651 mov k3, k0 ! Calculate IMASK-bits
652 shlr2 k0
653 and #0x3c, k0
654 cmp/eq #0x3c, k0
655 bt/s 6f
656 shll2 k0
657 mov g_imask, k0
658 !
659 6: or k0, k2 ! Set the IMASK-bits
660 ldc k2, ssr
661 !
662 #if defined(CONFIG_KGDB_NMI)
663 ! Clear in_nmi
664 mov.l 4f, k0
665 mov #0, k1
666 mov.b k1, @k0
667 #endif
668 mov.l @r15+, k2 ! restore EXPEVT
669 mov k4, r15
670 rte
671 nop
673 .align 2
674 1: .long TRA
675 2: .long NR_syscalls
676 3: .long sys_call_table
677 4: .long do_syscall_trace
678 5: .long 0x00001000 ! DSP
679 7: .long 0x30000000
680 9:
681 __INV_IMASK:
682 .long 0xffffff0f ! ~(IMASK)
684 ! Exception Vector Base
685 !
686 ! Should be aligned page boundary.
687 !
688 .balign 4096,0,4096
689 ENTRY(vbr_base)
690 .long 0
691 !
692 .balign 256,0,256
693 general_exception:
694 mov.l 1f, k2
695 mov.l 2f, k3
696 bra handle_exception
697 mov.l @k2, k2
698 .align 2
699 1: .long EXPEVT
700 2: .long ret_from_exception
701 !
702 !
703 .balign 1024,0,1024
704 tlb_miss:
705 mov.l 1f, k2
706 mov.l 4f, k3
707 bra handle_exception
708 mov.l @k2, k2
709 !
710 .balign 512,0,512
711 interrupt:
712 mov.l 2f, k2
713 mov.l 3f, k3
714 #if defined(CONFIG_KGDB_NMI)
715 ! Debounce (filter nested NMI)
716 mov.l @k2, k0
717 mov.l 5f, k1
718 cmp/eq k1, k0
719 bf 0f
720 mov.l 6f, k1
721 tas.b @k1
722 bt 0f
723 rte
724 nop
725 .align 2
726 5: .long NMI_VEC
727 6: .long in_nmi
728 0:
729 #endif /* defined(CONFIG_KGDB_NMI) */
730 bra handle_exception
731 mov.l @k2, k2
733 .align 2
734 1: .long EXPEVT
735 2: .long INTEVT
736 3: .long ret_from_irq
737 4: .long ret_from_exception
739 !
740 !
741 .align 2
742 handle_exception:
743 ! Using k0, k1 for scratch registers (r0_bank1, r1_bank),
744 ! save all registers onto stack.
745 !
746 stc ssr, k0 ! Is it from kernel space?
747 shll k0 ! Check MD bit (bit30) by shifting it into...
748 shll k0 ! ...the T bit
749 bt/s 1f ! It's a kernel to kernel transition.
750 mov r15, k0 ! save original stack to k0
751 /* User space to kernel */
752 mov #0x20, k1
753 shll8 k1 ! k1 := 8192 (== THREAD_SIZE)
754 add current, k1
755 mov k1, r15 ! change to kernel stack
756 !
757 1: mov #-1, k4
758 mov.l 2f, k1
759 !
760 #ifdef CONFIG_SH_DSP
761 mov.l r2, @-r15 ! Save r2, we need another reg
762 stc sr, k4
763 mov.l 1f, r2
764 tst r2, k4 ! Check if in DSP mode
765 mov.l @r15+, r2 ! Restore r2 now
766 bt/s skip_save
767 mov #0, k4 ! Set marker for no stack frame
769 mov r2, k4 ! Backup r2 (in k4) for later
771 ! Save DSP registers on stack
772 stc.l mod, @-r15
773 stc.l re, @-r15
774 stc.l rs, @-r15
775 sts.l dsr, @-r15
776 sts.l y1, @-r15
777 sts.l y0, @-r15
778 sts.l x1, @-r15
779 sts.l x0, @-r15
780 sts.l a0, @-r15
782 ! GAS is broken, does not generate correct "movs.l Ds,@-As" instr.
784 ! FIXME: Make sure that this is still the case with newer toolchains,
785 ! as we're not at all interested in supporting ancient toolchains at
786 ! this point. -- PFM.
788 mov r15, r2
789 .word 0xf653 ! movs.l a1, @-r2
790 .word 0xf6f3 ! movs.l a0g, @-r2
791 .word 0xf6d3 ! movs.l a1g, @-r2
792 .word 0xf6c3 ! movs.l m0, @-r2
793 .word 0xf6e3 ! movs.l m1, @-r2
794 mov r2, r15
796 mov k4, r2 ! Restore r2
797 mov.l 1f, k4 ! Force DSP stack frame
798 skip_save:
799 mov.l k4, @-r15 ! Push DSP mode marker onto stack
800 #endif
801 ! Save the user registers on the stack.
802 mov.l k2, @-r15 ! EXPEVT
803 mov.l k4, @-r15 ! set TRA (default: -1)
804 !
805 sts.l macl, @-r15
806 sts.l mach, @-r15
807 stc.l gbr, @-r15
808 stc.l ssr, @-r15
809 sts.l pr, @-r15
810 stc.l spc, @-r15
811 !
812 lds k3, pr ! Set the return address to pr
813 !
814 mov.l k0, @-r15 ! save orignal stack
815 mov.l r14, @-r15
816 mov.l r13, @-r15
817 mov.l r12, @-r15
818 mov.l r11, @-r15
819 mov.l r10, @-r15
820 mov.l r9, @-r15
821 mov.l r8, @-r15
822 !
823 stc sr, r8 ! Back to normal register bank, and
824 or k1, r8 ! Block all interrupts
825 mov.l 3f, k1
826 and k1, r8 ! ...
827 ldc r8, sr ! ...changed here.
828 !
829 mov.l r7, @-r15
830 mov.l r6, @-r15
831 mov.l r5, @-r15
832 mov.l r4, @-r15
833 mov.l r3, @-r15
834 mov.l r2, @-r15
835 mov.l r1, @-r15
836 mov.l r0, @-r15
837 ! Then, dispatch to the handler, according to the exception code.
838 stc k_ex_code, r8
839 shlr2 r8
840 shlr r8
841 mov.l 4f, r9
842 add r8, r9
843 mov.l @r9, r9
844 jmp @r9
845 nop
847 .align 2
848 1: .long 0x00001000 ! DSP=1
849 2: .long 0x000080f0 ! FD=1, IMASK=15
850 3: .long 0xcfffffff ! RB=0, BL=0
851 4: .long exception_handling_table
853 .align 2
854 ENTRY(exception_none)
855 rts
856 nop
858 .data
859 ENTRY(sys_call_table)
860 .long sys_ni_syscall /* 0 - old "setup()" system call*/
861 .long sys_exit
862 .long sys_fork
863 .long sys_read
864 .long sys_write
865 .long sys_open /* 5 */
866 .long sys_close
867 .long sys_waitpid
868 .long sys_creat
869 .long sys_link
870 .long sys_unlink /* 10 */
871 .long sys_execve
872 .long sys_chdir
873 .long sys_time
874 .long sys_mknod
875 .long sys_chmod /* 15 */
876 .long sys_lchown16
877 .long sys_ni_syscall /* old break syscall holder */
878 .long sys_stat
879 .long sys_lseek
880 .long sys_getpid /* 20 */
881 .long sys_mount
882 .long sys_oldumount
883 .long sys_setuid16
884 .long sys_getuid16
885 .long sys_stime /* 25 */
886 .long sys_ptrace
887 .long sys_alarm
888 .long sys_fstat
889 .long sys_pause
890 .long sys_utime /* 30 */
891 .long sys_ni_syscall /* old stty syscall holder */
892 .long sys_ni_syscall /* old gtty syscall holder */
893 .long sys_access
894 .long sys_nice
895 .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */
896 .long sys_sync
897 .long sys_kill
898 .long sys_rename
899 .long sys_mkdir
900 .long sys_rmdir /* 40 */
901 .long sys_dup
902 .long sys_pipe
903 .long sys_times
904 .long sys_ni_syscall /* old prof syscall holder */
905 .long sys_brk /* 45 */
906 .long sys_setgid16
907 .long sys_getgid16
908 .long sys_signal
909 .long sys_geteuid16
910 .long sys_getegid16 /* 50 */
911 .long sys_acct
912 .long sys_umount /* recycled never used phys() */
913 .long sys_ni_syscall /* old lock syscall holder */
914 .long sys_ioctl
915 .long sys_fcntl /* 55 */
916 .long sys_ni_syscall /* old mpx syscall holder */
917 .long sys_setpgid
918 .long sys_ni_syscall /* old ulimit syscall holder */
919 .long sys_ni_syscall /* sys_olduname */
920 .long sys_umask /* 60 */
921 .long sys_chroot
922 .long sys_ustat
923 .long sys_dup2
924 .long sys_getppid
925 .long sys_getpgrp /* 65 */
926 .long sys_setsid
927 .long sys_sigaction
928 .long sys_sgetmask
929 .long sys_ssetmask
930 .long sys_setreuid16 /* 70 */
931 .long sys_setregid16
932 .long sys_sigsuspend
933 .long sys_sigpending
934 .long sys_sethostname
935 .long sys_setrlimit /* 75 */
936 .long sys_old_getrlimit
937 .long sys_getrusage
938 .long sys_gettimeofday
939 .long sys_settimeofday
940 .long sys_getgroups16 /* 80 */
941 .long sys_setgroups16
942 .long sys_ni_syscall /* sys_oldselect */
943 .long sys_symlink
944 .long sys_lstat
945 .long sys_readlink /* 85 */
946 .long sys_uselib
947 .long sys_swapon
948 .long sys_reboot
949 .long old_readdir
950 .long old_mmap /* 90 */
951 .long sys_munmap
952 .long sys_truncate
953 .long sys_ftruncate
954 .long sys_fchmod
955 .long sys_fchown16 /* 95 */
956 .long sys_getpriority
957 .long sys_setpriority
958 .long sys_ni_syscall /* old profil syscall holder */
959 .long sys_statfs
960 .long sys_fstatfs /* 100 */
961 .long sys_ni_syscall /* ioperm */
962 .long sys_socketcall
963 .long sys_syslog
964 .long sys_setitimer
965 .long sys_getitimer /* 105 */
966 .long sys_newstat
967 .long sys_newlstat
968 .long sys_newfstat
969 .long sys_uname
970 .long sys_ni_syscall /* 110 */ /* iopl */
971 .long sys_vhangup
972 .long sys_ni_syscall /* idle */
973 .long sys_ni_syscall /* vm86old */
974 .long sys_wait4
975 .long sys_swapoff /* 115 */
976 .long sys_sysinfo
977 .long sys_ipc
978 .long sys_fsync
979 .long sys_sigreturn
980 .long sys_clone /* 120 */
981 .long sys_setdomainname
982 .long sys_newuname
983 .long sys_ni_syscall /* sys_modify_ldt */
984 .long sys_adjtimex
985 .long sys_mprotect /* 125 */
986 .long sys_sigprocmask
987 .long sys_ni_syscall /* old "create_module" */
988 .long sys_init_module
989 .long sys_delete_module
990 .long sys_ni_syscall /* 130: old "get_kernel_syms" */
991 .long sys_quotactl
992 .long sys_getpgid
993 .long sys_fchdir
994 .long sys_bdflush
995 .long sys_sysfs /* 135 */
996 .long sys_personality
997 .long sys_ni_syscall /* for afs_syscall */
998 .long sys_setfsuid16
999 .long sys_setfsgid16
1000 .long sys_llseek /* 140 */
1001 .long sys_getdents
1002 .long sys_select
1003 .long sys_flock
1004 .long sys_msync
1005 .long sys_readv /* 145 */
1006 .long sys_writev
1007 .long sys_getsid
1008 .long sys_fdatasync
1009 .long sys_sysctl
1010 .long sys_mlock /* 150 */
1011 .long sys_munlock
1012 .long sys_mlockall
1013 .long sys_munlockall
1014 .long sys_sched_setparam
1015 .long sys_sched_getparam /* 155 */
1016 .long sys_sched_setscheduler
1017 .long sys_sched_getscheduler
1018 .long sys_sched_yield
1019 .long sys_sched_get_priority_max
1020 .long sys_sched_get_priority_min /* 160 */
1021 .long sys_sched_rr_get_interval
1022 .long sys_nanosleep
1023 .long sys_mremap
1024 .long sys_setresuid16
1025 .long sys_getresuid16 /* 165 */
1026 .long sys_ni_syscall /* vm86 */
1027 .long sys_ni_syscall /* old "query_module" */
1028 .long sys_poll
1029 .long sys_nfsservctl
1030 .long sys_setresgid16 /* 170 */
1031 .long sys_getresgid16
1032 .long sys_prctl
1033 .long sys_rt_sigreturn
1034 .long sys_rt_sigaction
1035 .long sys_rt_sigprocmask /* 175 */
1036 .long sys_rt_sigpending
1037 .long sys_rt_sigtimedwait
1038 .long sys_rt_sigqueueinfo
1039 .long sys_rt_sigsuspend
1040 .long sys_pread_wrapper /* 180 */
1041 .long sys_pwrite_wrapper
1042 .long sys_chown16
1043 .long sys_getcwd
1044 .long sys_capget
1045 .long sys_capset /* 185 */
1046 .long sys_sigaltstack
1047 .long sys_sendfile
1048 .long sys_ni_syscall /* streams1 */
1049 .long sys_ni_syscall /* streams2 */
1050 .long sys_vfork /* 190 */
1051 .long sys_getrlimit
1052 .long sys_mmap2
1053 .long sys_truncate64
1054 .long sys_ftruncate64
1055 .long sys_stat64 /* 195 */
1056 .long sys_lstat64
1057 .long sys_fstat64
1058 .long sys_lchown
1059 .long sys_getuid
1060 .long sys_getgid /* 200 */
1061 .long sys_geteuid
1062 .long sys_getegid
1063 .long sys_setreuid
1064 .long sys_setregid
1065 .long sys_getgroups /* 205 */
1066 .long sys_setgroups
1067 .long sys_fchown
1068 .long sys_setresuid
1069 .long sys_getresuid
1070 .long sys_setresgid /* 210 */
1071 .long sys_getresgid
1072 .long sys_chown
1073 .long sys_setuid
1074 .long sys_setgid
1075 .long sys_setfsuid /* 215 */
1076 .long sys_setfsgid
1077 .long sys_pivot_root
1078 .long sys_mincore
1079 .long sys_madvise
1080 .long sys_getdents64 /* 220 */
1081 .long sys_fcntl64
1082 .long sys_ni_syscall /* reserved for TUX */
1083 .long sys_ni_syscall /* Reserved for Security */
1084 .long sys_gettid
1085 .long sys_readahead /* 225 */
1086 .long sys_setxattr
1087 .long sys_lsetxattr
1088 .long sys_fsetxattr
1089 .long sys_getxattr
1090 .long sys_lgetxattr /* 230 */
1091 .long sys_fgetxattr
1092 .long sys_listxattr
1093 .long sys_llistxattr
1094 .long sys_flistxattr
1095 .long sys_removexattr /* 235 */
1096 .long sys_lremovexattr
1097 .long sys_fremovexattr
1098 .long sys_tkill
1099 .long sys_sendfile64
1100 .long sys_futex /* 240 */
1101 .long sys_sched_setaffinity
1102 .long sys_sched_getaffinity
1103 .long sys_ni_syscall
1104 .long sys_ni_syscall
1105 .long sys_io_setup /* 245 */
1106 .long sys_io_destroy
1107 .long sys_io_getevents
1108 .long sys_io_submit
1109 .long sys_io_cancel
1110 .long sys_fadvise64 /* 250 */
1111 .long sys_ni_syscall
1112 .long sys_exit_group
1113 .long sys_lookup_dcookie
1114 .long sys_epoll_create
1115 .long sys_epoll_ctl /* 255 */
1116 .long sys_epoll_wait
1117 .long sys_remap_file_pages
1118 .long sys_set_tid_address
1119 .long sys_timer_create
1120 .long sys_timer_settime /* 260 */
1121 .long sys_timer_gettime
1122 .long sys_timer_getoverrun
1123 .long sys_timer_delete
1124 .long sys_clock_settime
1125 .long sys_clock_gettime /* 265 */
1126 .long sys_clock_getres
1127 .long sys_clock_nanosleep
1128 .long sys_statfs64
1129 .long sys_fstatfs64
1130 .long sys_tgkill /* 270 */
1131 .long sys_utimes
1132 .long sys_fadvise64_64_wrapper
1133 .long sys_ni_syscall /* Reserved for vserver */
1134 .long sys_ni_syscall /* Reserved for mbind */
1135 .long sys_ni_syscall /* 275 - get_mempolicy */
1136 .long sys_ni_syscall /* set_mempolicy */
1137 .long sys_mq_open
1138 .long sys_mq_unlink
1139 .long sys_mq_timedsend
1140 .long sys_mq_timedreceive /* 280 */
1141 .long sys_mq_notify
1142 .long sys_mq_getsetattr
1143 .long sys_ni_syscall /* Reserved for kexec */
1144 .long sys_waitid
1145 .long sys_add_key /* 285 */
1146 .long sys_request_key
1147 .long sys_keyctl
1149 /* End of entry.S */