| blob | 8eb0a9023482b89066c3b20a4b6c7bdd1d6bb3d1 |
1 /*
2 * File: arch/blackfin/mach-common/entry.S
3 * Based on:
4 * Author: Linus Torvalds
5 *
6 * Created: ?
7 * Description: contains the system-call and fault low-level handling routines.
8 * This also contains the timer-interrupt handler, as well as all
9 * interrupts and faults that can result in a task-switch.
10 *
11 * Modified:
12 * Copyright 2004-2006 Analog Devices Inc.
13 *
14 * Bugs: Enter bugs at http://blackfin.uclinux.org/
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, see the file COPYING, or write
28 * to the Free Software Foundation, Inc.,
29 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 */
32 /*
33 * 25-Dec-2004 - LG Soft India
34 * 1. Fix in return_from_int, to make sure any pending
35 * system call in ILAT for this process to get
36 * executed, otherwise in case context switch happens,
37 * system call of first process (i.e in ILAT) will be
38 * carried forward to the switched process.
39 * 2. Removed Constant references for the following
40 * a. IPEND
41 * b. EXCAUSE mask
42 * c. PAGE Mask
43 */
45 /*
46 * NOTE: This code handles signal-recognition, which happens every time
47 * after a timer-interrupt and after each system call.
48 */
51 #include <linux/linkage.h>
52 #include <asm/blackfin.h>
53 #include <asm/unistd.h>
54 #include <asm/errno.h>
55 #include <asm/thread_info.h> /* TIF_NEED_RESCHED */
56 #include <asm/asm-offsets.h>
58 #include <asm/mach-common/context.S>
60 #ifdef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
61 /*
62 * TODO: this should be proper save/restore, but for now
63 * we'll just cheat and use 0x1/0x13
64 */
65 # define DEBUG_START_HWTRACE \
66 P5.l = LO(TBUFCTL); \
67 P5.h = HI(TBUFCTL); \
68 R7 = 0x13; \
69 [P5] = R7;
70 # define DEBUG_STOP_HWTRACE \
71 P5.l = LO(TBUFCTL); \
72 P5.h = HI(TBUFCTL); \
73 R7 = 0x01; \
74 [P5] = R7;
75 #else
76 # define DEBUG_START_HWTRACE
77 # define DEBUG_STOP_HWTRACE
78 #endif
80 #ifdef CONFIG_EXCPT_IRQ_SYSC_L1
81 .section .l1.text
82 #else
83 .text
84 #endif
86 /* Slightly simplified and streamlined entry point for CPLB misses.
87 * This one does not lower the level to IRQ5, and thus can be used to
88 * patch up CPLB misses on the kernel stack.
89 */
90 ENTRY(_ex_dcplb)
91 #if defined(ANOMALY_05000261)
92 /*
93 * Work around an anomaly: if we see a new DCPLB fault, return
94 * without doing anything. Then, if we get the same fault again,
95 * handle it.
96 */
97 p5.l = _last_cplb_fault_retx;
98 p5.h = _last_cplb_fault_retx;
99 r7 = [p5];
100 r6 = retx;
101 [p5] = r6;
102 cc = r6 == r7;
103 if !cc jump _return_from_exception;
104 /* fall through */
105 #endif
107 ENTRY(_ex_icplb)
108 (R7:6,P5:4) = [sp++];
109 ASTAT = [sp++];
110 SAVE_ALL_SYS
111 call __cplb_hdr;
112 DEBUG_START_HWTRACE
113 RESTORE_ALL_SYS
114 SP = RETN;
115 rtx;
117 ENTRY(_ex_spinlock)
118 /* Transform this into a syscall - twiddle the syscall vector. */
119 p5.l = lo(EVT15);
120 p5.h = hi(EVT15);
121 r7.l = _spinlock_bh;
122 r7.h = _spinlock_bh;
123 [p5] = r7;
124 csync;
125 /* Fall through. */
127 ENTRY(_ex_syscall)
128 DEBUG_START_HWTRACE
129 (R7:6,P5:4) = [sp++];
130 ASTAT = [sp++];
131 raise 15; /* invoked by TRAP #0, for sys call */
132 sp = retn;
133 rtx
135 ENTRY(_spinlock_bh)
136 SAVE_ALL_SYS
137 /* To end up here, vector 15 was changed - so we have to change it
138 * back.
139 */
140 p0.l = lo(EVT15);
141 p0.h = hi(EVT15);
142 p1.l = _evt_system_call;
143 p1.h = _evt_system_call;
144 [p0] = p1;
145 csync;
146 r0 = [sp + PT_R0];
147 sp += -12;
148 call _sys_bfin_spinlock;
149 sp += 12;
150 [SP + PT_R0] = R0;
151 RESTORE_ALL_SYS
152 rti;
154 ENTRY(_ex_soft_bp)
155 r7 = retx;
156 r7 += -2;
157 retx = r7;
158 jump.s _ex_trap_c;
160 ENTRY(_ex_single_step)
161 r7 = retx;
162 r6 = reti;
163 cc = r7 == r6;
164 if cc jump _return_from_exception
165 r7 = syscfg;
166 bitclr (r7, 0);
167 syscfg = R7;
169 p5.l = lo(IPEND);
170 p5.h = hi(IPEND);
171 r6 = [p5];
172 cc = bittst(r6, 5);
173 if !cc jump _ex_trap_c;
174 p4.l = lo(EVT5);
175 p4.h = hi(EVT5);
176 r6.h = _exception_to_level5;
177 r6.l = _exception_to_level5;
178 r7 = [p4];
179 cc = r6 == r7;
180 if !cc jump _ex_trap_c;
182 _return_from_exception:
183 DEBUG_START_HWTRACE
184 (R7:6,P5:4) = [sp++];
185 ASTAT = [sp++];
186 sp = retn;
187 rtx;
189 ENTRY(_handle_bad_cplb)
190 /* To get here, we just tried and failed to change a CPLB
191 * so, handle things in trap_c (C code), by lowering to
192 * IRQ5, just like we normally do. Since this is not a
193 * "normal" return path, we have a do alot of stuff to
194 * the stack to get ready so, we can fall through - we
195 * need to make a CPLB exception look like a normal exception
196 */
198 DEBUG_START_HWTRACE
199 RESTORE_ALL_SYS
200 [--sp] = ASTAT;
201 [--sp] = (R7:6, P5:4);
203 ENTRY(_ex_trap_c)
204 /* Call C code (trap_c) to handle the exception, which most
205 * likely involves sending a signal to the current process.
206 * To avoid double faults, lower our priority to IRQ5 first.
207 */
208 P5.h = _exception_to_level5;
209 P5.l = _exception_to_level5;
210 p4.l = lo(EVT5);
211 p4.h = hi(EVT5);
212 [p4] = p5;
213 csync;
215 /* Disable all interrupts, but make sure level 5 is enabled so
216 * we can switch to that level. Save the old mask. */
217 cli r6;
218 p4.l = _excpt_saved_imask;
219 p4.h = _excpt_saved_imask;
220 [p4] = r6;
221 r6 = 0x3f;
222 sti r6;
224 /* Save the excause into a circular buffer, in case the instruction
225 * which caused this excecptions causes others.
226 */
227 P5.l = _in_ptr_excause;
228 P5.h = _in_ptr_excause;
229 R7 = [P5];
230 R7 += 4;
231 R6 = 0xF;
232 R7 = R7 & R6;
233 [P5] = R7;
234 R6.l = _excause_circ_buf;
235 R6.h = _excause_circ_buf;
236 R7 = R7 + R6;
237 p5 = R7;
238 R6 = SEQSTAT;
239 [P5] = R6;
241 DEBUG_START_HWTRACE
242 (R7:6,P5:4) = [sp++];
243 ASTAT = [sp++];
244 SP = RETN;
245 raise 5;
246 rtx;
248 ENTRY(_exception_to_level5)
249 SAVE_ALL_SYS
251 /* Restore interrupt mask. We haven't pushed RETI, so this
252 * doesn't enable interrupts until we return from this handler. */
253 p4.l = _excpt_saved_imask;
254 p4.h = _excpt_saved_imask;
255 r6 = [p4];
256 sti r6;
258 /* Restore the hardware error vector. */
259 P5.h = _evt_ivhw;
260 P5.l = _evt_ivhw;
261 p4.l = lo(EVT5);
262 p4.h = hi(EVT5);
263 [p4] = p5;
264 csync;
266 p2.l = lo(IPEND);
267 p2.h = hi(IPEND);
268 csync;
269 r0 = [p2]; /* Read current IPEND */
270 [sp + PT_IPEND] = r0; /* Store IPEND */
272 /* Pop the excause from the circular buffer and push it on the stack
273 * (in the right place - if you change the location of SEQSTAT, you
274 * must change this offset.
275 */
276 .L_excep_to_5_again:
277 P5.l = _out_ptr_excause;
278 P5.h = _out_ptr_excause;
279 R7 = [P5];
280 R7 += 4;
281 R6 = 0xF;
282 R7 = R7 & R6;
283 [P5] = R7;
284 R6.l = _excause_circ_buf;
285 R6.h = _excause_circ_buf;
286 R7 = R7 + R6;
287 P5 = R7;
288 R1 = [P5];
289 [SP + 8] = r1;
291 r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */
292 SP += -12;
293 call _trap_c;
294 SP += 12;
296 /* See if anything else is in the exception buffer
297 * if there is, process it
298 */
299 P5.l = _out_ptr_excause;
300 P5.h = _out_ptr_excause;
301 P4.l = _in_ptr_excause;
302 P4.h = _in_ptr_excause;
303 R6 = [P5];
304 R7 = [P4];
305 CC = R6 == R7;
306 if ! CC JUMP .L_excep_to_5_again
308 call _ret_from_exception;
309 RESTORE_ALL_SYS
310 rti;
312 ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
313 /* Since the kernel stack can be anywhere, it's not guaranteed to be
314 * covered by a CPLB. Switch to an exception stack; use RETN as a
315 * scratch register (for want of a better option).
316 */
317 retn = sp;
318 sp.l = _exception_stack_top;
319 sp.h = _exception_stack_top;
320 /* Try to deal with syscalls quickly. */
321 [--sp] = ASTAT;
322 [--sp] = (R7:6, P5:4);
323 DEBUG_STOP_HWTRACE
324 r7 = SEQSTAT; /* reason code is in bit 5:0 */
325 r6.l = lo(SEQSTAT_EXCAUSE);
326 r6.h = hi(SEQSTAT_EXCAUSE);
327 r7 = r7 & r6;
328 p5.h = _extable;
329 p5.l = _extable;
330 p4 = r7;
331 p5 = p5 + (p4 << 2);
332 p4 = [p5];
333 jump (p4);
335 .Lbadsys:
336 r7 = -ENOSYS; /* signextending enough */
337 [sp + PT_R0] = r7; /* return value from system call */
338 jump .Lsyscall_really_exit;
340 ENTRY(_kernel_execve)
341 link SIZEOF_PTREGS;
342 p0 = sp;
343 r3 = SIZEOF_PTREGS / 4;
344 r4 = 0(x);
345 0:
346 [p0++] = r4;
347 r3 += -1;
348 cc = r3 == 0;
349 if !cc jump 0b (bp);
351 p0 = sp;
352 sp += -16;
353 [sp + 12] = p0;
354 call _do_execve;
355 SP += 16;
356 cc = r0 == 0;
357 if ! cc jump 1f;
358 /* Success. Copy our temporary pt_regs to the top of the kernel
359 * stack and do a normal exception return.
360 */
361 r1 = sp;
362 r0 = (-KERNEL_STACK_SIZE) (x);
363 r1 = r1 & r0;
364 p2 = r1;
365 p3 = [p2];
366 r0 = KERNEL_STACK_SIZE - 4 (z);
367 p1 = r0;
368 p1 = p1 + p2;
370 p0 = fp;
371 r4 = [p0--];
372 r3 = SIZEOF_PTREGS / 4;
373 0:
374 r4 = [p0--];
375 [p1--] = r4;
376 r3 += -1;
377 cc = r3 == 0;
378 if ! cc jump 0b (bp);
380 r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
381 p1 = r0;
382 p1 = p1 + p2;
383 sp = p1;
384 r0 = syscfg;
385 [SP + PT_SYSCFG] = r0;
386 [p3 + (TASK_THREAD + THREAD_KSP)] = sp;
388 RESTORE_CONTEXT;
389 rti;
390 1:
391 unlink;
392 rts;
394 ENTRY(_system_call)
395 /* Store IPEND */
396 p2.l = lo(IPEND);
397 p2.h = hi(IPEND);
398 csync;
399 r0 = [p2];
400 [sp + PT_IPEND] = r0;
402 /* Store RETS for now */
403 r0 = rets;
404 [sp + PT_RESERVED] = r0;
405 /* Set the stack for the current process */
406 r7 = sp;
407 r6.l = lo(ALIGN_PAGE_MASK);
408 r6.h = hi(ALIGN_PAGE_MASK);
409 r7 = r7 & r6; /* thread_info */
410 p2 = r7;
411 p2 = [p2];
413 [p2+(TASK_THREAD+THREAD_KSP)] = sp;
415 /* Check the System Call */
416 r7 = __NR_syscall;
417 /* System call number is passed in P0 */
418 r6 = p0;
419 cc = r6 < r7;
420 if ! cc jump .Lbadsys;
422 /* are we tracing syscalls?*/
423 r7 = sp;
424 r6.l = lo(ALIGN_PAGE_MASK);
425 r6.h = hi(ALIGN_PAGE_MASK);
426 r7 = r7 & r6;
427 p2 = r7;
428 r7 = [p2+TI_FLAGS];
429 CC = BITTST(r7,TIF_SYSCALL_TRACE);
430 if CC JUMP _sys_trace;
432 /* Execute the appropriate system call */
434 p4 = p0;
435 p5.l = _sys_call_table;
436 p5.h = _sys_call_table;
437 p5 = p5 + (p4 << 2);
438 r0 = [sp + PT_R0];
439 r1 = [sp + PT_R1];
440 r2 = [sp + PT_R2];
441 p5 = [p5];
443 [--sp] = r5;
444 [--sp] = r4;
445 [--sp] = r3;
446 SP += -12;
447 call (p5);
448 SP += 24;
449 [sp + PT_R0] = r0;
451 .Lresume_userspace:
452 r7 = sp;
453 r4.l = lo(ALIGN_PAGE_MASK);
454 r4.h = hi(ALIGN_PAGE_MASK);
455 r7 = r7 & r4; /* thread_info->flags */
456 p5 = r7;
457 .Lresume_userspace_1:
458 /* Disable interrupts. */
459 [--sp] = reti;
460 reti = [sp++];
462 r7 = [p5 + TI_FLAGS];
463 r4.l = lo(_TIF_WORK_MASK);
464 r4.h = hi(_TIF_WORK_MASK);
465 r7 = r7 & r4;
467 .Lsyscall_resched:
468 cc = BITTST(r7, TIF_NEED_RESCHED);
469 if !cc jump .Lsyscall_sigpending;
471 /* Reenable interrupts. */
472 [--sp] = reti;
473 r0 = [sp++];
475 SP += -12;
476 call _schedule;
477 SP += 12;
479 jump .Lresume_userspace_1;
481 .Lsyscall_sigpending:
482 cc = BITTST(r7, TIF_RESTORE_SIGMASK);
483 if cc jump .Lsyscall_do_signals;
484 cc = BITTST(r7, TIF_SIGPENDING);
485 if !cc jump .Lsyscall_really_exit;
486 .Lsyscall_do_signals:
487 /* Reenable interrupts. */
488 [--sp] = reti;
489 r0 = [sp++];
491 r0 = sp;
492 SP += -12;
493 call _do_signal;
494 SP += 12;
496 .Lsyscall_really_exit:
497 r5 = [sp + PT_RESERVED];
498 rets = r5;
499 rts;
501 _sys_trace:
502 call _syscall_trace;
504 /* Execute the appropriate system call */
506 p4 = [SP + PT_P0];
507 p5.l = _sys_call_table;
508 p5.h = _sys_call_table;
509 p5 = p5 + (p4 << 2);
510 r0 = [sp + PT_R0];
511 r1 = [sp + PT_R1];
512 r2 = [sp + PT_R2];
513 r3 = [sp + PT_R3];
514 r4 = [sp + PT_R4];
515 r5 = [sp + PT_R5];
516 p5 = [p5];
518 [--sp] = r5;
519 [--sp] = r4;
520 [--sp] = r3;
521 SP += -12;
522 call (p5);
523 SP += 24;
524 [sp + PT_R0] = r0;
526 call _syscall_trace;
527 jump .Lresume_userspace;
529 ENTRY(_resume)
530 /*
531 * Beware - when entering resume, prev (the current task) is
532 * in r0, next (the new task) is in r1.
533 */
534 p0 = r0;
535 p1 = r1;
536 [--sp] = rets;
537 [--sp] = fp;
538 [--sp] = (r7:4, p5:3);
540 /* save usp */
541 p2 = usp;
542 [p0+(TASK_THREAD+THREAD_USP)] = p2;
544 /* save current kernel stack pointer */
545 [p0+(TASK_THREAD+THREAD_KSP)] = sp;
547 /* save program counter */
548 r1.l = _new_old_task;
549 r1.h = _new_old_task;
550 [p0+(TASK_THREAD+THREAD_PC)] = r1;
552 /* restore the kernel stack pointer */
553 sp = [p1+(TASK_THREAD+THREAD_KSP)];
555 /* restore user stack pointer */
556 p0 = [p1+(TASK_THREAD+THREAD_USP)];
557 usp = p0;
559 /* restore pc */
560 p0 = [p1+(TASK_THREAD+THREAD_PC)];
561 jump (p0);
563 /*
564 * Following code actually lands up in a new (old) task.
565 */
567 _new_old_task:
568 (r7:4, p5:3) = [sp++];
569 fp = [sp++];
570 rets = [sp++];
572 /*
573 * When we come out of resume, r0 carries "old" task, becuase we are
574 * in "new" task.
575 */
576 rts;
578 ENTRY(_ret_from_exception)
579 p2.l = lo(IPEND);
580 p2.h = hi(IPEND);
582 csync;
583 r0 = [p2];
584 [sp + PT_IPEND] = r0;
586 1:
587 r1 = 0x37(Z);
588 r2 = ~r1;
589 r2.h = 0;
590 r0 = r2 & r0;
591 cc = r0 == 0;
592 if !cc jump 4f; /* if not return to user mode, get out */
594 /* Make sure any pending system call or deferred exception
595 * return in ILAT for this process to get executed, otherwise
596 * in case context switch happens, system call of
597 * first process (i.e in ILAT) will be carried
598 * forward to the switched process
599 */
601 p2.l = lo(ILAT);
602 p2.h = hi(ILAT);
603 r0 = [p2];
604 r1 = (EVT_IVG14 | EVT_IVG15) (z);
605 r0 = r0 & r1;
606 cc = r0 == 0;
607 if !cc jump 5f;
609 /* Set the stack for the current process */
610 r7 = sp;
611 r4.l = lo(ALIGN_PAGE_MASK);
612 r4.h = hi(ALIGN_PAGE_MASK);
613 r7 = r7 & r4; /* thread_info->flags */
614 p5 = r7;
615 r7 = [p5 + TI_FLAGS];
616 r4.l = lo(_TIF_WORK_MASK);
617 r4.h = hi(_TIF_WORK_MASK);
618 r7 = r7 & r4;
619 cc = r7 == 0;
620 if cc jump 4f;
622 p0.l = lo(EVT15);
623 p0.h = hi(EVT15);
624 p1.l = _schedule_and_signal;
625 p1.h = _schedule_and_signal;
626 [p0] = p1;
627 csync;
628 raise 15; /* raise evt14 to do signal or reschedule */
629 4:
630 r0 = syscfg;
631 bitclr(r0, 0);
632 syscfg = r0;
633 5:
634 rts;
636 ENTRY(_return_from_int)
637 /* If someone else already raised IRQ 15, do nothing. */
638 csync;
639 p2.l = lo(ILAT);
640 p2.h = hi(ILAT);
641 r0 = [p2];
642 cc = bittst (r0, EVT_IVG15_P);
643 if cc jump 2f;
645 /* if not return to user mode, get out */
646 p2.l = lo(IPEND);
647 p2.h = hi(IPEND);
648 r0 = [p2];
649 r1 = 0x17(Z);
650 r2 = ~r1;
651 r2.h = 0;
652 r0 = r2 & r0;
653 r1 = 1;
654 r1 = r0 - r1;
655 r2 = r0 & r1;
656 cc = r2 == 0;
657 if !cc jump 2f;
659 /* Lower the interrupt level to 15. */
660 p0.l = lo(EVT15);
661 p0.h = hi(EVT15);
662 p1.l = _schedule_and_signal_from_int;
663 p1.h = _schedule_and_signal_from_int;
664 [p0] = p1;
665 csync;
666 #if defined(ANOMALY_05000281)
667 r0.l = lo(CONFIG_BOOT_LOAD);
668 r0.h = hi(CONFIG_BOOT_LOAD);
669 reti = r0;
670 #endif
671 r0 = 0x801f (z);
672 STI r0;
673 raise 15; /* raise evt15 to do signal or reschedule */
674 rti;
675 2:
676 rts;
678 ENTRY(_lower_to_irq14)
679 #if defined(ANOMALY_05000281)
680 r0.l = lo(CONFIG_BOOT_LOAD);
681 r0.h = hi(CONFIG_BOOT_LOAD);
682 reti = r0;
683 #endif
684 r0 = 0x401f;
685 sti r0;
686 raise 14;
687 rti;
688 ENTRY(_evt14_softirq)
689 #ifdef CONFIG_DEBUG_HWERR
690 r0 = 0x3f;
691 sti r0;
692 #else
693 cli r0;
694 #endif
695 [--sp] = RETI;
696 SP += 4;
697 rts;
699 _schedule_and_signal_from_int:
700 /* To end up here, vector 15 was changed - so we have to change it
701 * back.
702 */
703 p0.l = lo(EVT15);
704 p0.h = hi(EVT15);
705 p1.l = _evt_system_call;
706 p1.h = _evt_system_call;
707 [p0] = p1;
708 csync;
709 p1 = rets;
710 [sp + PT_RESERVED] = p1;
712 p0.l = _irq_flags;
713 p0.h = _irq_flags;
714 r0 = [p0];
715 sti r0;
717 jump.s .Lresume_userspace;
719 _schedule_and_signal:
720 SAVE_CONTEXT_SYSCALL
721 /* To end up here, vector 15 was changed - so we have to change it
722 * back.
723 */
724 p0.l = lo(EVT15);
725 p0.h = hi(EVT15);
726 p1.l = _evt_system_call;
727 p1.h = _evt_system_call;
728 [p0] = p1;
729 csync;
730 p0.l = 1f;
731 p0.h = 1f;
732 [sp + PT_RESERVED] = P0;
733 call .Lresume_userspace;
734 1:
735 RESTORE_CONTEXT
736 rti;
738 /* Make sure when we start, that the circular buffer is initialized properly
739 * R0 and P0 are call clobbered, so we can use them here.
740 */
741 ENTRY(_init_exception_buff)
742 r0 = 0;
743 p0.h = _in_ptr_excause;
744 p0.l = _in_ptr_excause;
745 [p0] = r0;
746 p0.h = _out_ptr_excause;
747 p0.l = _out_ptr_excause;
748 [p0] = r0;
749 rts;
751 /*
752 * Put these in the kernel data section - that should always be covered by
753 * a CPLB. This is needed to ensure we don't get double fault conditions
754 */
756 #ifdef CONFIG_SYSCALL_TAB_L1
757 .section .l1.data
758 #else
759 .data
760 #endif
761 ALIGN
762 _extable:
763 /* entry for each EXCAUSE[5:0]
764 * This table bmust be in sync with the table in ./kernel/traps.c
765 * EXCPT instruction can provide 4 bits of EXCAUSE, allowing 16 to be user defined
766 */
767 .long _ex_syscall; /* 0x00 - User Defined - Linux Syscall */
768 .long _ex_soft_bp /* 0x01 - User Defined - Software breakpoint */
769 .long _ex_trap_c /* 0x02 - User Defined */
770 .long _ex_trap_c /* 0x03 - User Defined - Atomic test and set service */
771 .long _ex_spinlock /* 0x04 - User Defined */
772 .long _ex_trap_c /* 0x05 - User Defined */
773 .long _ex_trap_c /* 0x06 - User Defined */
774 .long _ex_trap_c /* 0x07 - User Defined */
775 .long _ex_trap_c /* 0x08 - User Defined */
776 .long _ex_trap_c /* 0x09 - User Defined */
777 .long _ex_trap_c /* 0x0A - User Defined */
778 .long _ex_trap_c /* 0x0B - User Defined */
779 .long _ex_trap_c /* 0x0C - User Defined */
780 .long _ex_trap_c /* 0x0D - User Defined */
781 .long _ex_trap_c /* 0x0E - User Defined */
782 .long _ex_trap_c /* 0x0F - User Defined */
783 .long _ex_single_step /* 0x10 - HW Single step */
784 .long _ex_trap_c /* 0x11 - Trace Buffer Full */
785 .long _ex_trap_c /* 0x12 - Reserved */
786 .long _ex_trap_c /* 0x13 - Reserved */
787 .long _ex_trap_c /* 0x14 - Reserved */
788 .long _ex_trap_c /* 0x15 - Reserved */
789 .long _ex_trap_c /* 0x16 - Reserved */
790 .long _ex_trap_c /* 0x17 - Reserved */
791 .long _ex_trap_c /* 0x18 - Reserved */
792 .long _ex_trap_c /* 0x19 - Reserved */
793 .long _ex_trap_c /* 0x1A - Reserved */
794 .long _ex_trap_c /* 0x1B - Reserved */
795 .long _ex_trap_c /* 0x1C - Reserved */
796 .long _ex_trap_c /* 0x1D - Reserved */
797 .long _ex_trap_c /* 0x1E - Reserved */
798 .long _ex_trap_c /* 0x1F - Reserved */
799 .long _ex_trap_c /* 0x20 - Reserved */
800 .long _ex_trap_c /* 0x21 - Undefined Instruction */
801 .long _ex_trap_c /* 0x22 - Illegal Instruction Combination */
802 .long _ex_dcplb /* 0x23 - Data CPLB Protection Violation */
803 .long _ex_trap_c /* 0x24 - Data access misaligned */
804 .long _ex_trap_c /* 0x25 - Unrecoverable Event */
805 .long _ex_dcplb /* 0x26 - Data CPLB Miss */
806 .long _ex_trap_c /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero */
807 .long _ex_trap_c /* 0x28 - Emulation Watchpoint */
808 .long _ex_trap_c /* 0x29 - Instruction fetch access error (535 only) */
809 .long _ex_trap_c /* 0x2A - Instruction fetch misaligned */
810 .long _ex_icplb /* 0x2B - Instruction CPLB protection Violation */
811 .long _ex_icplb /* 0x2C - Instruction CPLB miss */
812 .long _ex_trap_c /* 0x2D - Instruction CPLB Multiple Hits */
813 .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
814 .long _ex_trap_c /* 0x2E - Illegal use of Supervisor Resource */
815 .long _ex_trap_c /* 0x2F - Reserved */
816 .long _ex_trap_c /* 0x30 - Reserved */
817 .long _ex_trap_c /* 0x31 - Reserved */
818 .long _ex_trap_c /* 0x32 - Reserved */
819 .long _ex_trap_c /* 0x33 - Reserved */
820 .long _ex_trap_c /* 0x34 - Reserved */
821 .long _ex_trap_c /* 0x35 - Reserved */
822 .long _ex_trap_c /* 0x36 - Reserved */
823 .long _ex_trap_c /* 0x37 - Reserved */
824 .long _ex_trap_c /* 0x38 - Reserved */
825 .long _ex_trap_c /* 0x39 - Reserved */
826 .long _ex_trap_c /* 0x3A - Reserved */
827 .long _ex_trap_c /* 0x3B - Reserved */
828 .long _ex_trap_c /* 0x3C - Reserved */
829 .long _ex_trap_c /* 0x3D - Reserved */
830 .long _ex_trap_c /* 0x3E - Reserved */
831 .long _ex_trap_c /* 0x3F - Reserved */
833 ALIGN
834 ENTRY(_sys_call_table)
835 .long _sys_ni_syscall /* 0 - old "setup()" system call*/
836 .long _sys_exit
837 .long _sys_fork
838 .long _sys_read
839 .long _sys_write
840 .long _sys_open /* 5 */
841 .long _sys_close
842 .long _sys_ni_syscall /* old waitpid */
843 .long _sys_creat
844 .long _sys_link
845 .long _sys_unlink /* 10 */
846 .long _sys_execve
847 .long _sys_chdir
848 .long _sys_time
849 .long _sys_mknod
850 .long _sys_chmod /* 15 */
851 .long _sys_chown /* chown16 */
852 .long _sys_ni_syscall /* old break syscall holder */
853 .long _sys_ni_syscall /* old stat */
854 .long _sys_lseek
855 .long _sys_getpid /* 20 */
856 .long _sys_mount
857 .long _sys_ni_syscall /* old umount */
858 .long _sys_setuid
859 .long _sys_getuid
860 .long _sys_stime /* 25 */
861 .long _sys_ptrace
862 .long _sys_alarm
863 .long _sys_ni_syscall /* old fstat */
864 .long _sys_pause
865 .long _sys_ni_syscall /* old utime */ /* 30 */
866 .long _sys_ni_syscall /* old stty syscall holder */
867 .long _sys_ni_syscall /* old gtty syscall holder */
868 .long _sys_access
869 .long _sys_nice
870 .long _sys_ni_syscall /* 35 */ /* old ftime syscall holder */
871 .long _sys_sync
872 .long _sys_kill
873 .long _sys_rename
874 .long _sys_mkdir
875 .long _sys_rmdir /* 40 */
876 .long _sys_dup
877 .long _sys_pipe
878 .long _sys_times
879 .long _sys_ni_syscall /* old prof syscall holder */
880 .long _sys_brk /* 45 */
881 .long _sys_setgid
882 .long _sys_getgid
883 .long _sys_ni_syscall /* old sys_signal */
884 .long _sys_geteuid /* geteuid16 */
885 .long _sys_getegid /* getegid16 */ /* 50 */
886 .long _sys_acct
887 .long _sys_umount /* recycled never used phys() */
888 .long _sys_ni_syscall /* old lock syscall holder */
889 .long _sys_ioctl
890 .long _sys_fcntl /* 55 */
891 .long _sys_ni_syscall /* old mpx syscall holder */
892 .long _sys_setpgid
893 .long _sys_ni_syscall /* old ulimit syscall holder */
894 .long _sys_ni_syscall /* old old uname */
895 .long _sys_umask /* 60 */
896 .long _sys_chroot
897 .long _sys_ustat
898 .long _sys_dup2
899 .long _sys_getppid
900 .long _sys_getpgrp /* 65 */
901 .long _sys_setsid
902 .long _sys_ni_syscall /* old sys_sigaction */
903 .long _sys_sgetmask
904 .long _sys_ssetmask
905 .long _sys_setreuid /* setreuid16 */ /* 70 */
906 .long _sys_setregid /* setregid16 */
907 .long _sys_ni_syscall /* old sys_sigsuspend */
908 .long _sys_ni_syscall /* old sys_sigpending */
909 .long _sys_sethostname
910 .long _sys_setrlimit /* 75 */
911 .long _sys_ni_syscall /* old getrlimit */
912 .long _sys_getrusage
913 .long _sys_gettimeofday
914 .long _sys_settimeofday
915 .long _sys_getgroups /* getgroups16 */ /* 80 */
916 .long _sys_setgroups /* setgroups16 */
917 .long _sys_ni_syscall /* old_select */
918 .long _sys_symlink
919 .long _sys_ni_syscall /* old lstat */
920 .long _sys_readlink /* 85 */
921 .long _sys_uselib
922 .long _sys_ni_syscall /* sys_swapon */
923 .long _sys_reboot
924 .long _sys_ni_syscall /* old_readdir */
925 .long _sys_ni_syscall /* sys_mmap */ /* 90 */
926 .long _sys_munmap
927 .long _sys_truncate
928 .long _sys_ftruncate
929 .long _sys_fchmod
930 .long _sys_fchown /* fchown16 */ /* 95 */
931 .long _sys_getpriority
932 .long _sys_setpriority
933 .long _sys_ni_syscall /* old profil syscall holder */
934 .long _sys_statfs
935 .long _sys_fstatfs /* 100 */
936 .long _sys_ni_syscall
937 .long _sys_ni_syscall /* old sys_socketcall */
938 .long _sys_syslog
939 .long _sys_setitimer
940 .long _sys_getitimer /* 105 */
941 .long _sys_newstat
942 .long _sys_newlstat
943 .long _sys_newfstat
944 .long _sys_ni_syscall /* old uname */
945 .long _sys_ni_syscall /* iopl for i386 */ /* 110 */
946 .long _sys_vhangup
947 .long _sys_ni_syscall /* obsolete idle() syscall */
948 .long _sys_ni_syscall /* vm86old for i386 */
949 .long _sys_wait4
950 .long _sys_ni_syscall /* 115 */ /* sys_swapoff */
951 .long _sys_sysinfo
952 .long _sys_ni_syscall /* old sys_ipc */
953 .long _sys_fsync
954 .long _sys_ni_syscall /* old sys_sigreturn */
955 .long _sys_clone /* 120 */
956 .long _sys_setdomainname
957 .long _sys_newuname
958 .long _sys_ni_syscall /* old sys_modify_ldt */
959 .long _sys_adjtimex
960 .long _sys_ni_syscall /* 125 */ /* sys_mprotect */
961 .long _sys_ni_syscall /* old sys_sigprocmask */
962 .long _sys_ni_syscall /* old "creat_module" */
963 .long _sys_init_module
964 .long _sys_delete_module
965 .long _sys_ni_syscall /* 130: old "get_kernel_syms" */
966 .long _sys_quotactl
967 .long _sys_getpgid
968 .long _sys_fchdir
969 .long _sys_bdflush
970 .long _sys_ni_syscall /* 135 */ /* sys_sysfs */
971 .long _sys_personality
972 .long _sys_ni_syscall /* for afs_syscall */
973 .long _sys_setfsuid /* setfsuid16 */
974 .long _sys_setfsgid /* setfsgid16 */
975 .long _sys_llseek /* 140 */
976 .long _sys_getdents
977 .long _sys_ni_syscall /* sys_select */
978 .long _sys_flock
979 .long _sys_ni_syscall /* sys_msync */
980 .long _sys_readv /* 145 */
981 .long _sys_writev
982 .long _sys_getsid
983 .long _sys_fdatasync
984 .long _sys_sysctl
985 .long _sys_ni_syscall /* 150 */ /* sys_mlock */
986 .long _sys_ni_syscall /* sys_munlock */
987 .long _sys_ni_syscall /* sys_mlockall */
988 .long _sys_ni_syscall /* sys_munlockall */
989 .long _sys_sched_setparam
990 .long _sys_sched_getparam /* 155 */
991 .long _sys_sched_setscheduler
992 .long _sys_sched_getscheduler
993 .long _sys_sched_yield
994 .long _sys_sched_get_priority_max
995 .long _sys_sched_get_priority_min /* 160 */
996 .long _sys_sched_rr_get_interval
997 .long _sys_nanosleep
998 .long _sys_ni_syscall /* sys_mremap */
999 .long _sys_setresuid /* setresuid16 */
1000 .long _sys_getresuid /* getresuid16 */ /* 165 */
1001 .long _sys_ni_syscall /* for vm86 */
1002 .long _sys_ni_syscall /* old "query_module" */
1003 .long _sys_ni_syscall /* sys_poll */
1004 .long _sys_ni_syscall /* sys_nfsservctl */
1005 .long _sys_setresgid /* setresgid16 */ /* 170 */
1006 .long _sys_getresgid /* getresgid16 */
1007 .long _sys_prctl
1008 .long _sys_rt_sigreturn
1009 .long _sys_rt_sigaction
1010 .long _sys_rt_sigprocmask /* 175 */
1011 .long _sys_rt_sigpending
1012 .long _sys_rt_sigtimedwait
1013 .long _sys_rt_sigqueueinfo
1014 .long _sys_rt_sigsuspend
1015 .long _sys_pread64 /* 180 */
1016 .long _sys_pwrite64
1017 .long _sys_lchown /* lchown16 */
1018 .long _sys_getcwd
1019 .long _sys_capget
1020 .long _sys_capset /* 185 */
1021 .long _sys_sigaltstack
1022 .long _sys_sendfile
1023 .long _sys_ni_syscall /* streams1 */
1024 .long _sys_ni_syscall /* streams2 */
1025 .long _sys_vfork /* 190 */
1026 .long _sys_getrlimit
1027 .long _sys_mmap2
1028 .long _sys_truncate64
1029 .long _sys_ftruncate64
1030 .long _sys_stat64 /* 195 */
1031 .long _sys_lstat64
1032 .long _sys_fstat64
1033 .long _sys_chown
1034 .long _sys_getuid
1035 .long _sys_getgid /* 200 */
1036 .long _sys_geteuid
1037 .long _sys_getegid
1038 .long _sys_setreuid
1039 .long _sys_setregid
1040 .long _sys_getgroups /* 205 */
1041 .long _sys_setgroups
1042 .long _sys_fchown
1043 .long _sys_setresuid
1044 .long _sys_getresuid
1045 .long _sys_setresgid /* 210 */
1046 .long _sys_getresgid
1047 .long _sys_lchown
1048 .long _sys_setuid
1049 .long _sys_setgid
1050 .long _sys_setfsuid /* 215 */
1051 .long _sys_setfsgid
1052 .long _sys_pivot_root
1053 .long _sys_ni_syscall /* sys_mincore */
1054 .long _sys_ni_syscall /* sys_madvise */
1055 .long _sys_getdents64 /* 220 */
1056 .long _sys_fcntl64
1057 .long _sys_ni_syscall /* reserved for TUX */
1058 .long _sys_ni_syscall
1059 .long _sys_gettid
1060 .long _sys_ni_syscall /* 225 */ /* sys_readahead */
1061 .long _sys_setxattr
1062 .long _sys_lsetxattr
1063 .long _sys_fsetxattr
1064 .long _sys_getxattr
1065 .long _sys_lgetxattr /* 230 */
1066 .long _sys_fgetxattr
1067 .long _sys_listxattr
1068 .long _sys_llistxattr
1069 .long _sys_flistxattr
1070 .long _sys_removexattr /* 235 */
1071 .long _sys_lremovexattr
1072 .long _sys_fremovexattr
1073 .long _sys_tkill
1074 .long _sys_sendfile64
1075 .long _sys_futex /* 240 */
1076 .long _sys_sched_setaffinity
1077 .long _sys_sched_getaffinity
1078 .long _sys_ni_syscall /* sys_set_thread_area */
1079 .long _sys_ni_syscall /* sys_get_thread_area */
1080 .long _sys_io_setup /* 245 */
1081 .long _sys_io_destroy
1082 .long _sys_io_getevents
1083 .long _sys_io_submit
1084 .long _sys_io_cancel
1085 .long _sys_ni_syscall /* 250 */ /* sys_alloc_hugepages */
1086 .long _sys_ni_syscall /* sys_freec_hugepages */
1087 .long _sys_exit_group
1088 .long _sys_lookup_dcookie
1089 .long _sys_bfin_spinlock
1090 .long _sys_epoll_create /* 255 */
1091 .long _sys_epoll_ctl
1092 .long _sys_epoll_wait
1093 .long _sys_ni_syscall /* remap_file_pages */
1094 .long _sys_set_tid_address
1095 .long _sys_timer_create /* 260 */
1096 .long _sys_timer_settime
1097 .long _sys_timer_gettime
1098 .long _sys_timer_getoverrun
1099 .long _sys_timer_delete
1100 .long _sys_clock_settime /* 265 */
1101 .long _sys_clock_gettime
1102 .long _sys_clock_getres
1103 .long _sys_clock_nanosleep
1104 .long _sys_statfs64
1105 .long _sys_fstatfs64 /* 270 */
1106 .long _sys_tgkill
1107 .long _sys_utimes
1108 .long _sys_fadvise64_64
1109 .long _sys_ni_syscall /* vserver */
1110 .long _sys_ni_syscall /* 275, mbind */
1111 .long _sys_ni_syscall /* get_mempolicy */
1112 .long _sys_ni_syscall /* set_mempolicy */
1113 .long _sys_mq_open
1114 .long _sys_mq_unlink
1115 .long _sys_mq_timedsend /* 280 */
1116 .long _sys_mq_timedreceive
1117 .long _sys_mq_notify
1118 .long _sys_mq_getsetattr
1119 .long _sys_ni_syscall /* kexec_load */
1120 .long _sys_waitid /* 285 */
1121 .long _sys_add_key
1122 .long _sys_request_key
1123 .long _sys_keyctl
1124 .long _sys_ioprio_set
1125 .long _sys_ioprio_get /* 290 */
1126 .long _sys_inotify_init
1127 .long _sys_inotify_add_watch
1128 .long _sys_inotify_rm_watch
1129 .long _sys_ni_syscall /* migrate_pages */
1130 .long _sys_openat /* 295 */
1131 .long _sys_mkdirat
1132 .long _sys_mknodat
1133 .long _sys_fchownat
1134 .long _sys_futimesat
1135 .long _sys_fstatat64 /* 300 */
1136 .long _sys_unlinkat
1137 .long _sys_renameat
1138 .long _sys_linkat
1139 .long _sys_symlinkat
1140 .long _sys_readlinkat /* 305 */
1141 .long _sys_fchmodat
1142 .long _sys_faccessat
1143 .long _sys_pselect6
1144 .long _sys_ppoll
1145 .long _sys_unshare /* 310 */
1146 .long _sys_sram_alloc
1147 .long _sys_sram_free
1148 .long _sys_dma_memcpy
1149 .long _sys_accept
1150 .long _sys_bind /* 315 */
1151 .long _sys_connect
1152 .long _sys_getpeername
1153 .long _sys_getsockname
1154 .long _sys_getsockopt
1155 .long _sys_listen /* 320 */
1156 .long _sys_recv
1157 .long _sys_recvfrom
1158 .long _sys_recvmsg
1159 .long _sys_send
1160 .long _sys_sendmsg /* 325 */
1161 .long _sys_sendto
1162 .long _sys_setsockopt
1163 .long _sys_shutdown
1164 .long _sys_socket
1165 .long _sys_socketpair /* 330 */
1166 .long _sys_semctl
1167 .long _sys_semget
1168 .long _sys_semop
1169 .long _sys_msgctl
1170 .long _sys_msgget /* 335 */
1171 .long _sys_msgrcv
1172 .long _sys_msgsnd
1173 .long _sys_shmat
1174 .long _sys_shmctl
1175 .long _sys_shmdt /* 340 */
1176 .long _sys_shmget
1177 .rept NR_syscalls-(.-_sys_call_table)/4
1178 .long _sys_ni_syscall
1179 .endr
1180 _excpt_saved_imask:
1181 .long 0;
1183 _exception_stack:
1184 .rept 1024
1185 .long 0;
1186 .endr
1187 _exception_stack_top:
1189 #if defined(ANOMALY_05000261)
1190 /* Used by the assembly entry point to work around an anomaly. */
1191 _last_cplb_fault_retx:
1192 .long 0;
1193 #endif
1194 /*
1195 * Single instructions can have multiple faults, which need to be
1196 * handled by traps.c, in irq5. We store the exception cause to ensure
1197 * we don't miss a double fault condition
1198 */
1199 ENTRY(_in_ptr_excause)
1200 .long 0;
1201 ENTRY(_out_ptr_excause)
1202 .long 0;
1203 ALIGN
1204 ENTRY(_excause_circ_buf)
1205 .rept 4
1206 .long 0
1207 .endr