1 /* !! 1 /* -*- mode: asm -*-
2 * Low-level system-call handling, trap handle <<
3 * 2 *
4 * Copyright (C) 2008-2009 Michal Simek <monstr !! 3 * linux/arch/m68k/kernel/entry.S
5 * Copyright (C) 2008-2009 PetaLogix <<
6 * Copyright (C) 2003 John Williams < <<
7 * Copyright (C) 2001,2002 NEC Corporatio <<
8 * Copyright (C) 2001,2002 Miles Bader <mi <<
9 * 4 *
10 * This file is subject to the terms and condi !! 5 * Copyright (C) 1991, 1992 Linus Torvalds
11 * Public License. See the file COPYING in the <<
12 * archive for more details. <<
13 * 6 *
14 * Written by Miles Bader <miles@gnu.org> !! 7 * This file is subject to the terms and conditions of the GNU General Public
15 * Heavily modified by John Williams for Micro !! 8 * License. See the file README.legal in the main directory of this archive
16 */ !! 9 * for more details.
17 <<
18 #include <linux/sys.h> <<
19 #include <linux/linkage.h> <<
20 <<
21 #include <asm/entry.h> <<
22 #include <asm/current.h> <<
23 #include <asm/processor.h> <<
24 #include <asm/exceptions.h> <<
25 #include <asm/asm-offsets.h> <<
26 #include <asm/thread_info.h> <<
27 <<
28 #include <asm/page.h> <<
29 #include <asm/unistd.h> <<
30 #include <asm/xilinx_mb_manager.h> <<
31 <<
32 #include <linux/errno.h> <<
33 #include <asm/signal.h> <<
34 #include <asm/mmu.h> <<
35 <<
36 #undef DEBUG <<
37 <<
38 #ifdef DEBUG <<
39 /* Create space for syscalls counting. */ <<
40 .section .data <<
41 .global syscall_debug_table <<
42 .align 4 <<
43 syscall_debug_table: <<
44 .space (__NR_syscalls * 4) <<
45 #endif /* DEBUG */ <<
46 <<
47 #define C_ENTRY(name) .globl name; .align 4; <<
48 <<
49 /* <<
50 * Various ways of setting and clearing BIP in <<
51 * This is mucky, but necessary using microbla <<
52 * allows msr ops to write to BIP <<
53 */ <<
54 #if CONFIG_XILINX_MICROBLAZE0_USE_MSR_INSTR <<
55 .macro clear_bip <<
56 msrclr r0, MSR_BIP <<
57 .endm <<
58 <<
59 .macro set_bip <<
60 msrset r0, MSR_BIP <<
61 .endm <<
62 <<
63 .macro clear_eip <<
64 msrclr r0, MSR_EIP <<
65 .endm <<
66 <<
67 .macro set_ee <<
68 msrset r0, MSR_EE <<
69 .endm <<
70 <<
71 .macro disable_irq <<
72 msrclr r0, MSR_IE <<
73 .endm <<
74 <<
75 .macro enable_irq <<
76 msrset r0, MSR_IE <<
77 .endm <<
78 <<
79 .macro set_ums <<
80 msrset r0, MSR_UMS <<
81 msrclr r0, MSR_VMS <<
82 .endm <<
83 <<
84 .macro set_vms <<
85 msrclr r0, MSR_UMS <<
86 msrset r0, MSR_VMS <<
87 .endm <<
88 <<
89 .macro clear_ums <<
90 msrclr r0, MSR_UMS <<
91 .endm <<
92 <<
93 .macro clear_vms_ums <<
94 msrclr r0, MSR_VMS | MSR_UMS <<
95 .endm <<
96 #else <<
97 .macro clear_bip <<
98 mfs r11, rmsr <<
99 andi r11, r11, ~MSR_BIP <<
100 mts rmsr, r11 <<
101 .endm <<
102 <<
103 .macro set_bip <<
104 mfs r11, rmsr <<
105 ori r11, r11, MSR_BIP <<
106 mts rmsr, r11 <<
107 .endm <<
108 <<
109 .macro clear_eip <<
110 mfs r11, rmsr <<
111 andi r11, r11, ~MSR_EIP <<
112 mts rmsr, r11 <<
113 .endm <<
114 <<
115 .macro set_ee <<
116 mfs r11, rmsr <<
117 ori r11, r11, MSR_EE <<
118 mts rmsr, r11 <<
119 .endm <<
120 <<
121 .macro disable_irq <<
122 mfs r11, rmsr <<
123 andi r11, r11, ~MSR_IE <<
124 mts rmsr, r11 <<
125 .endm <<
126 <<
127 .macro enable_irq <<
128 mfs r11, rmsr <<
129 ori r11, r11, MSR_IE <<
130 mts rmsr, r11 <<
131 .endm <<
132 <<
133 .macro set_ums <<
134 mfs r11, rmsr <<
135 ori r11, r11, MSR_VMS <<
136 andni r11, r11, MSR_UMS <<
137 mts rmsr, r11 <<
138 .endm <<
139 <<
140 .macro set_vms <<
141 mfs r11, rmsr <<
142 ori r11, r11, MSR_VMS <<
143 andni r11, r11, MSR_UMS <<
144 mts rmsr, r11 <<
145 .endm <<
146 <<
147 .macro clear_ums <<
148 mfs r11, rmsr <<
149 andni r11, r11, MSR_UMS <<
150 mts rmsr,r11 <<
151 .endm <<
152 <<
153 .macro clear_vms_ums <<
154 mfs r11, rmsr <<
155 andni r11, r11, (MSR_VMS|MSR_UMS) <<
156 mts rmsr,r11 <<
157 .endm <<
158 #endif <<
159 <<
160 /* Define how to call high-level functions. Wi <<
161 * enabled when calling the high-level functio <<
162 * VM_ON, VM_OFF, DO_JUMP_BIPCLR, DO_CALL <<
163 */ <<
164 <<
165 /* turn on virtual protected mode save */ <<
166 #define VM_ON \ <<
167 set_ums; \ <<
168 rted r0, 2f; \ <<
169 nop; \ <<
170 2: <<
171 <<
172 /* turn off virtual protected mode save and us <<
173 #define VM_OFF \ <<
174 clear_vms_ums; \ <<
175 rted r0, TOPHYS(1f); \ <<
176 nop; \ <<
177 1: <<
178 <<
179 #define SAVE_REGS \ <<
180 swi r2, r1, PT_R2; /* Save SDA */ <<
181 swi r3, r1, PT_R3; <<
182 swi r4, r1, PT_R4; <<
183 swi r5, r1, PT_R5; <<
184 swi r6, r1, PT_R6; <<
185 swi r7, r1, PT_R7; <<
186 swi r8, r1, PT_R8; <<
187 swi r9, r1, PT_R9; <<
188 swi r10, r1, PT_R10; <<
189 swi r11, r1, PT_R11; /* sav <<
190 swi r12, r1, PT_R12; <<
191 swi r13, r1, PT_R13; /* Sav <<
192 swi r14, r1, PT_PC; /* PC, before <<
193 swi r15, r1, PT_R15; /* Sav <<
194 swi r16, r1, PT_R16; <<
195 swi r17, r1, PT_R17; <<
196 swi r18, r1, PT_R18; /* Sav <<
197 swi r19, r1, PT_R19; <<
198 swi r20, r1, PT_R20; <<
199 swi r21, r1, PT_R21; <<
200 swi r22, r1, PT_R22; <<
201 swi r23, r1, PT_R23; <<
202 swi r24, r1, PT_R24; <<
203 swi r25, r1, PT_R25; <<
204 swi r26, r1, PT_R26; <<
205 swi r27, r1, PT_R27; <<
206 swi r28, r1, PT_R28; <<
207 swi r29, r1, PT_R29; <<
208 swi r30, r1, PT_R30; <<
209 swi r31, r1, PT_R31; /* Sav <<
210 mfs r11, rmsr; /* sav <<
211 swi r11, r1, PT_MSR; <<
212 <<
213 #define RESTORE_REGS_GP \ <<
214 lwi r2, r1, PT_R2; /* restore SDA <<
215 lwi r3, r1, PT_R3; <<
216 lwi r4, r1, PT_R4; <<
217 lwi r5, r1, PT_R5; <<
218 lwi r6, r1, PT_R6; <<
219 lwi r7, r1, PT_R7; <<
220 lwi r8, r1, PT_R8; <<
221 lwi r9, r1, PT_R9; <<
222 lwi r10, r1, PT_R10; <<
223 lwi r11, r1, PT_R11; /* res <<
224 lwi r12, r1, PT_R12; <<
225 lwi r13, r1, PT_R13; /* res <<
226 lwi r14, r1, PT_PC; /* RESTORE_LIN <<
227 lwi r15, r1, PT_R15; /* res <<
228 lwi r16, r1, PT_R16; <<
229 lwi r17, r1, PT_R17; <<
230 lwi r18, r1, PT_R18; /* res <<
231 lwi r19, r1, PT_R19; <<
232 lwi r20, r1, PT_R20; <<
233 lwi r21, r1, PT_R21; <<
234 lwi r22, r1, PT_R22; <<
235 lwi r23, r1, PT_R23; <<
236 lwi r24, r1, PT_R24; <<
237 lwi r25, r1, PT_R25; <<
238 lwi r26, r1, PT_R26; <<
239 lwi r27, r1, PT_R27; <<
240 lwi r28, r1, PT_R28; <<
241 lwi r29, r1, PT_R29; <<
242 lwi r30, r1, PT_R30; <<
243 lwi r31, r1, PT_R31; /* Res <<
244 <<
245 #define RESTORE_REGS \ <<
246 lwi r11, r1, PT_MSR; <<
247 mts rmsr , r11; <<
248 RESTORE_REGS_GP <<
249 <<
250 #define RESTORE_REGS_RTBD \ <<
251 lwi r11, r1, PT_MSR; <<
252 andni r11, r11, MSR_EIP; /* <<
253 ori r11, r11, MSR_EE | MSR_BIP; /* <<
254 mts rmsr , r11; <<
255 RESTORE_REGS_GP <<
256 <<
257 #define SAVE_STATE \ <<
258 swi r1, r0, TOPHYS(PER_CPU(ENTRY_S <<
259 /* See if already in kernel mode.*/ <<
260 mfs r1, rmsr; <<
261 andi r1, r1, MSR_UMS; <<
262 bnei r1, 1f; <<
263 /* Kernel-mode state save. */ <<
264 /* Reload kernel stack-ptr. */ <<
265 lwi r1, r0, TOPHYS(PER_CPU(ENTRY_S <<
266 /* FIXME: I can add these two lines to <<
267 /* tophys(r1,r1); */ <<
268 /* addik r1, r1, -PT_SIZE; */ <<
269 addik r1, r1, CONFIG_KERNEL_BASE_ADD <<
270 SAVE_REGS <<
271 brid 2f; <<
272 swi r1, r1, PT_MODE; <<
273 1: /* User-mode state save. */ <<
274 lwi r1, r0, TOPHYS(PER_CPU(CURRENT <<
275 tophys(r1,r1); <<
276 lwi r1, r1, TS_THREAD_INFO; /* get <<
277 /* MS these three instructions can be <<
278 /* addik r1, r1, THREAD_SIZE; * <<
279 /* tophys(r1,r1); */ <<
280 /* addik r1, r1, -PT_SIZE; */ <<
281 addik r1, r1, THREAD_SIZE + CONFIG_KER <<
282 SAVE_REGS <<
283 lwi r11, r0, TOPHYS(PER_CPU(ENTRY_ <<
284 swi r11, r1, PT_R1; /* Store user <<
285 swi r0, r1, PT_MODE; /* Was in use <<
286 /* MS: I am clearing UMS even in case <<
287 clear_ums; <<
288 2: lwi CURRENT_TASK, r0, TOPHYS(PER_C <<
289 <<
290 .text <<
291 <<
292 .extern cpuinfo <<
293 <<
294 C_ENTRY(mb_flush_dcache): <<
295 addik r1, r1, -PT_SIZE <<
296 SAVE_REGS <<
297 <<
298 addik r3, r0, cpuinfo <<
299 lwi r7, r3, CI_DCS <<
300 lwi r8, r3, CI_DCL <<
301 sub r9, r7, r8 <<
302 1: <<
303 wdc.flush r9, r0 <<
304 bgtid r9, 1b <<
305 addk r9, r9, r8 <<
306 <<
307 RESTORE_REGS <<
308 addik r1, r1, PT_SIZE <<
309 rtsd r15, 8 <<
310 nop <<
311 <<
312 C_ENTRY(mb_invalidate_icache): <<
313 addik r1, r1, -PT_SIZE <<
314 SAVE_REGS <<
315 <<
316 addik r3, r0, cpuinfo <<
317 lwi r7, r3, CI_ICS <<
318 lwi r8, r3, CI_ICL <<
319 sub r9, r7, r8 <<
320 1: <<
321 wic r9, r0 <<
322 bgtid r9, 1b <<
323 addk r9, r9, r8 <<
324 <<
325 RESTORE_REGS <<
326 addik r1, r1, PT_SIZE <<
327 rtsd r15, 8 <<
328 nop <<
329 <<
330 /* <<
331 * User trap. <<
332 * 10 *
333 * System calls are handled here. !! 11 * Linux/m68k support by Hamish Macdonald
334 * 12 *
335 * Syscall protocol: !! 13 * 68060 fixes by Jesper Skov
336 * Syscall number in r12, args in r5-r10 <<
337 * Return value in r3 <<
338 * 14 *
339 * Trap entered via brki instruction, so BIP b <<
340 * are masked. This is nice, means we don't ha <<
341 */ 15 */
342 C_ENTRY(_user_exception): <<
343 swi r1, r0, TOPHYS(PER_CPU(ENTRY_S <<
344 addi r14, r14, 4 /* return addr <<
345 <<
346 lwi r1, r0, TOPHYS(PER_CPU(CURRENT <<
347 tophys(r1,r1); <<
348 lwi r1, r1, TS_THREAD_INFO; /* get <<
349 /* calculate kernel stack pointer from task st <<
350 addik r1, r1, THREAD_SIZE; <<
351 tophys(r1,r1); <<
352 <<
353 addik r1, r1, -PT_SIZE; /* Make room <<
354 SAVE_REGS <<
355 swi r0, r1, PT_R3 <<
356 swi r0, r1, PT_R4 <<
357 <<
358 swi r0, r1, PT_MODE; <<
359 lwi r11, r0, TOPHYS(PER_CPU(ENTRY_ <<
360 swi r11, r1, PT_R1; /* Sto <<
361 clear_ums; <<
362 2: lwi CURRENT_TASK, r0, TOPHYS(PER_C <<
363 /* Save away the syscall number. */ <<
364 swi r12, r1, PT_R0; <<
365 tovirt(r1,r1) <<
366 <<
367 /* where the trap should return need -8 to adj <<
368 /* Jump to the appropriate function for the sy <<
369 * (r12 is not preserved), or return an error <<
370 * register should point to the location where <<
371 * the called function should return. [note t <<
372 <<
373 /* Step into virtual mode */ <<
374 rtbd r0, 3f <<
375 nop <<
376 3: <<
377 lwi r11, CURRENT_TASK, TS_THREAD_I <<
378 lwi r11, r11, TI_FLAGS /* ge <<
379 andi r11, r11, _TIF_WORK_SYSCALL_MA <<
380 beqi r11, 4f <<
381 <<
382 addik r3, r0, -ENOSYS <<
383 swi r3, r1, PT_R3 <<
384 brlid r15, do_syscall_trace_enter <<
385 addik r5, r1, PT_R0 <<
386 <<
387 # do_syscall_trace_enter returns the n <<
388 addk r12, r0, r3 <<
389 lwi r5, r1, PT_R5; <<
390 lwi r6, r1, PT_R6; <<
391 lwi r7, r1, PT_R7; <<
392 lwi r8, r1, PT_R8; <<
393 lwi r9, r1, PT_R9; <<
394 lwi r10, r1, PT_R10; <<
395 4: <<
396 /* Jump to the appropriate function for the sy <<
397 * (r12 is not preserved), or return an error <<
398 * The LP register should point to the locatio <<
399 * should return. [note that MAKE_SYS_CALL us <<
400 /* See if the system call number is va <<
401 blti r12, 5f <<
402 addi r11, r12, -__NR_syscalls; <<
403 bgei r11, 5f; <<
404 /* Figure out which function to use fo <<
405 /* Note Microblaze barrel shift is opt <<
406 add r12, r12, r12; <<
407 add r12, r12, r12; <<
408 addi r30, r0, 1 <<
409 <<
410 #ifdef DEBUG <<
411 /* Trac syscalls and stored them to sy <<
412 /* The first syscall location stores t <<
413 lwi r3, r0, syscall_debug_table <<
414 addi r3, r3, 1 <<
415 swi r3, r0, syscall_debug_table <<
416 lwi r3, r12, syscall_debug_table <<
417 addi r3, r3, 1 <<
418 swi r3, r12, syscall_debug_table <<
419 #endif <<
420 <<
421 # Find and jump into the syscall handl <<
422 lwi r12, r12, sys_call_table <<
423 /* where the trap should return need - <<
424 addi r15, r0, ret_from_trap-8 <<
425 bra r12 <<
426 <<
427 /* The syscall number is invalid, retu <<
428 5: <<
429 braid ret_from_trap <<
430 addi r3, r0, -ENOSYS; <<
431 <<
432 /* Entry point used to return from a syscall/t <<
433 /* We re-enable BIP bit before state restore * <<
434 C_ENTRY(ret_from_trap): <<
435 swi r3, r1, PT_R3 <<
436 swi r4, r1, PT_R4 <<
437 <<
438 lwi r11, r1, PT_MODE; <<
439 /* See if returning to kernel mode, if so, ski <<
440 bnei r11, 2f; <<
441 /* We're returning to user mode, so ch <<
442 * trigger rescheduling. */ <<
443 /* FIXME: Restructure all these flag c <<
444 lwi r11, CURRENT_TASK, TS_THREAD_I <<
445 lwi r11, r11, TI_FLAGS; <<
446 andi r11, r11, _TIF_WORK_SYSCALL_MA <<
447 beqi r11, 1f <<
448 <<
449 brlid r15, do_syscall_trace_leave <<
450 addik r5, r1, PT_R0 <<
451 1: <<
452 /* We're returning to user mode, so ch <<
453 * trigger rescheduling. */ <<
454 /* get thread info from current task * <<
455 lwi r11, CURRENT_TASK, TS_THREAD_I <<
456 lwi r19, r11, TI_FLAGS; <<
457 andi r11, r19, _TIF_NEED_RESCHED; <<
458 beqi r11, 5f; <<
459 <<
460 bralid r15, schedule; /* Call schedu <<
461 nop; /* del <<
462 bri 1b <<
463 <<
464 /* Maybe handle a signal */ <<
465 5: <<
466 andi r11, r19, _TIF_SIGPENDING | _T <<
467 beqi r11, 4f; /* Sig <<
468 <<
469 addik r5, r1, 0; /* Arg <<
470 bralid r15, do_notify_resume; /* Han <<
471 add r6, r30, r0; /* Arg <<
472 add r30, r0, r0 /* no <<
473 bri 1b <<
474 <<
475 /* Finally, return to user state. */ <<
476 4: set_bip; /* In <<
477 swi CURRENT_TASK, r0, PER_CPU(CURR <<
478 VM_OFF; <<
479 tophys(r1,r1); <<
480 RESTORE_REGS_RTBD; <<
481 addik r1, r1, PT_SIZE /* Cle <<
482 lwi r1, r1, PT_R1 - PT_SIZE;/* Res <<
483 bri 6f; <<
484 <<
485 /* Return to kernel state. */ <<
486 2: set_bip; /* In <<
487 VM_OFF; <<
488 tophys(r1,r1); <<
489 RESTORE_REGS_RTBD; <<
490 addik r1, r1, PT_SIZE /* Cle <<
491 tovirt(r1,r1); <<
492 6: <<
493 TRAP_return: /* Make global symbol <<
494 rtbd r14, 0; /* Instructions to ret <<
495 nop; <<
496 <<
497 <<
498 /* This the initial entry point for a new chil <<
499 stack in place that makes it look like the <<
500 syscall. This function is actually `return <<
501 (copy_thread makes ret_from_fork the return <<
502 saved context). */ <<
503 C_ENTRY(ret_from_fork): <<
504 bralid r15, schedule_tail; /* ...whic <<
505 add r5, r3, r0; /* switch_thre <<
506 /* ( in the de <<
507 brid ret_from_trap; /* Do normal t <<
508 add r3, r0, r0; /* Child's for <<
509 <<
510 C_ENTRY(ret_from_kernel_thread): <<
511 bralid r15, schedule_tail; /* ...whic <<
512 add r5, r3, r0; /* switch_thre <<
513 /* ( in the de <<
514 brald r15, r20 /* fn was left <<
515 addk r5, r0, r19 /* ... and arg <<
516 brid ret_from_trap <<
517 add r3, r0, r0 <<
518 <<
519 C_ENTRY(sys_rt_sigreturn_wrapper): <<
520 addik r30, r0, 0 /* no <<
521 brid sys_rt_sigreturn /* Do <<
522 addik r5, r1, 0; /* add <<
523 16
524 /* 17 /*
525 * HW EXCEPTION rutine start !! 18 * entry.S contains the system-call and fault low-level handling routines.
526 */ !! 19 * This also contains the timer-interrupt handler, as well as all interrupts
527 C_ENTRY(full_exception_trap): !! 20 * and faults that can result in a task-switch.
528 /* adjust exception address for privil <<
529 * for finding where is it */ <<
530 addik r17, r17, -4 <<
531 SAVE_STATE /* Save registers */ <<
532 /* PC, before IRQ/trap - this is one i <<
533 swi r17, r1, PT_PC; <<
534 tovirt(r1,r1) <<
535 /* FIXME this can be store directly in <<
536 * I tested it but there is a fault */ <<
537 /* where the trap should return need - <<
538 addik r15, r0, ret_from_exc - 8 <<
539 mfs r6, resr <<
540 mfs r7, rfsr; /* sav <<
541 mts rfsr, r0; /* Clear stick <<
542 rted r0, full_exception <<
543 addik r5, r1, 0 /* pa <<
544 <<
545 /* <<
546 * Unaligned data trap. <<
547 * <<
548 * Unaligned data trap last on 4k page is hand <<
549 * 21 *
550 * Trap entered via exception, so EE bit is se !! 22 * NOTE: This code handles signal-recognition, which happens every time
551 * are masked. This is nice, means we don't h !! 23 * after a timer-interrupt and after each system call.
552 * 24 *
553 * The assembler routine is in "arch/microblaz <<
554 */ 25 */
555 C_ENTRY(unaligned_data_trap): <<
556 /* MS: I have to save r11 value and th <<
557 * set_bit, clear_eip, set_ee use r11 <<
558 * instructions are not used. We don't <<
559 * are used and they use r0 instead of <<
560 * I am using ENTRY_SP which should be <<
561 * pointer saving. */ <<
562 swi r11, r0, TOPHYS(PER_CPU(ENTRY_ <<
563 set_bip; /* equalize initial st <<
564 clear_eip; <<
565 set_ee; <<
566 lwi r11, r0, TOPHYS(PER_CPU(ENTRY_ <<
567 SAVE_STATE /* Save regist <<
568 /* PC, before IRQ/trap - this is one i <<
569 swi r17, r1, PT_PC; <<
570 tovirt(r1,r1) <<
571 /* where the trap should return need - <<
572 addik r15, r0, ret_from_exc-8 <<
573 mfs r3, resr /* ESR <<
574 mfs r4, rear /* EAR <<
575 rtbd r0, _unaligned_data_exception <<
576 addik r7, r1, 0 /* par <<
577 26
578 /* 27 /*
579 * Page fault traps. !! 28 * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
580 * !! 29 * all pointers that used to be 'current' are now entry
581 * If the real exception handler (from hw_exce !! 30 * number 0 in the 'current_set' list.
582 * the mapping for the process, then we're thr <<
583 * <<
584 * Trap entered via exceptions, so EE bit is s <<
585 * are masked. This is nice, means we don't h <<
586 * <<
587 * Build a standard exception frame for TLB Ac <<
588 * will bail out to this point if they can't r <<
589 * 31 *
590 * The C function called is in "arch/microblaz !! 32 * 6/05/00 RZ: addedd writeback completion after return from sighandler
591 * void do_page_fault(struct pt_regs *regs, !! 33 * for 68040
592 * unsigned long <<
593 * unsigned long <<
594 */ 34 */
595 /* data and intruction trap - which is choose <<
596 C_ENTRY(page_fault_data_trap): <<
597 SAVE_STATE /* Save regist <<
598 /* PC, before IRQ/trap - this is one i <<
599 swi r17, r1, PT_PC; <<
600 tovirt(r1,r1) <<
601 /* where the trap should return need - <<
602 addik r15, r0, ret_from_exc-8 <<
603 mfs r6, rear /* par <<
604 mfs r7, resr /* par <<
605 rted r0, do_page_fault <<
606 addik r5, r1, 0 /* par <<
607 <<
608 C_ENTRY(page_fault_instr_trap): <<
609 SAVE_STATE /* Save regist <<
610 /* PC, before IRQ/trap - this is one i <<
611 swi r17, r1, PT_PC; <<
612 tovirt(r1,r1) <<
613 /* where the trap should return need - <<
614 addik r15, r0, ret_from_exc-8 <<
615 mfs r6, rear /* par <<
616 ori r7, r0, 0 /* par <<
617 rted r0, do_page_fault <<
618 addik r5, r1, 0 /* par <<
619 <<
620 /* Entry point used to return from an exceptio <<
621 C_ENTRY(ret_from_exc): <<
622 lwi r11, r1, PT_MODE; <<
623 bnei r11, 2f; /* See <<
624 /* ... <<
625 35
626 /* We're returning to user mode, so ch !! 36 #include <linux/linkage.h>
627 trigger rescheduling. */ !! 37 #include <asm/errno.h>
628 1: !! 38 #include <asm/setup.h>
629 lwi r11, CURRENT_TASK, TS_THREAD_I !! 39 #include <asm/traps.h>
630 lwi r19, r11, TI_FLAGS; /* get !! 40 #include <asm/unistd.h>
631 andi r11, r19, _TIF_NEED_RESCHED; !! 41 #include <asm/asm-offsets.h>
632 beqi r11, 5f; !! 42 #include <asm/entry.h>
633 <<
634 /* Call the scheduler before returning from a <<
635 bralid r15, schedule; /* Call schedu <<
636 nop; /* del <<
637 bri 1b <<
638 <<
639 /* Maybe handle a signal */ <<
640 5: andi r11, r19, _TIF_SIGPENDING | _T <<
641 beqi r11, 4f; /* Sig <<
642 <<
643 /* <<
644 * Handle a signal return; Pending sig <<
645 * <<
646 * Not all registers are saved by the <<
647 * points (for instance, call-saved re <<
648 * C-compiler calling sequence in the <<
649 * preserved), and call-clobbered regi <<
650 * traps), but signal handlers may wan <<
651 * complete register state. Here we s <<
652 * the normal entry sequence, so that <<
653 * (in a possibly modified form) after <<
654 addik r5, r1, 0; /* Arg <<
655 bralid r15, do_notify_resume; /* Han <<
656 addi r6, r0, 0; /* Arg <<
657 bri 1b <<
658 <<
659 /* Finally, return to user state. */ <<
660 4: set_bip; /* Int <<
661 swi CURRENT_TASK, r0, PER_CPU(CURR <<
662 VM_OFF; <<
663 tophys(r1,r1); <<
664 <<
665 RESTORE_REGS_RTBD; <<
666 addik r1, r1, PT_SIZE /* Cle <<
667 <<
668 lwi r1, r1, PT_R1 - PT_SIZE; /* Re <<
669 bri 6f; <<
670 /* Return to kernel state. */ <<
671 2: set_bip; /* Int <<
672 VM_OFF; <<
673 tophys(r1,r1); <<
674 RESTORE_REGS_RTBD; <<
675 addik r1, r1, PT_SIZE /* Cle <<
676 <<
677 tovirt(r1,r1); <<
678 6: <<
679 EXC_return: /* Make global symbol <<
680 rtbd r14, 0; /* Instructions to ret <<
681 nop; <<
682 43
683 /* !! 44 .globl system_call, buserr, trap, resume
684 * HW EXCEPTION rutine end !! 45 .globl sys_call_table
685 */ !! 46 .globl __sys_fork, __sys_clone, __sys_vfork
>> 47 .globl bad_interrupt
>> 48 .globl auto_irqhandler_fixup
>> 49 .globl user_irqvec_fixup
686 50
687 /* !! 51 .text
688 * Hardware maskable interrupts. !! 52 ENTRY(__sys_fork)
689 * !! 53 SAVE_SWITCH_STACK
690 * The stack-pointer (r1) should have already !! 54 jbsr sys_fork
691 * location PER_CPU(ENTRY_SP). !! 55 lea %sp@(24),%sp
692 */ !! 56 rts
693 C_ENTRY(_interrupt): !! 57
694 /* MS: we are in physical address */ !! 58 ENTRY(__sys_clone)
695 /* Save registers, switch to proper stack, con !! 59 SAVE_SWITCH_STACK
696 swi r1, r0, TOPHYS(PER_CPU(ENTRY_S !! 60 pea %sp@(SWITCH_STACK_SIZE)
697 /* MS: See if already in kernel mode. !! 61 jbsr m68k_clone
698 mfs r1, rmsr !! 62 lea %sp@(28),%sp
699 nop !! 63 rts
700 andi r1, r1, MSR_UMS !! 64
701 bnei r1, 1f !! 65 ENTRY(__sys_vfork)
702 !! 66 SAVE_SWITCH_STACK
703 /* Kernel-mode state save. */ !! 67 jbsr sys_vfork
704 lwi r1, r0, TOPHYS(PER_CPU(ENTRY_S !! 68 lea %sp@(24),%sp
705 tophys(r1,r1); /* MS: I have in r1 phy !! 69 rts
706 /* save registers */ !! 70
707 /* MS: Make room on the stack -> activation re !! 71 ENTRY(__sys_clone3)
708 addik r1, r1, -PT_SIZE; !! 72 SAVE_SWITCH_STACK
709 SAVE_REGS !! 73 pea %sp@(SWITCH_STACK_SIZE)
710 brid 2f; !! 74 jbsr m68k_clone3
711 swi r1, r1, PT_MODE; /* 0 - user m !! 75 lea %sp@(28),%sp
712 1: !! 76 rts
713 /* User-mode state save. */ !! 77
714 /* MS: get the saved current */ !! 78 ENTRY(sys_sigreturn)
715 lwi r1, r0, TOPHYS(PER_CPU(CURRENT !! 79 SAVE_SWITCH_STACK
716 tophys(r1,r1); !! 80 movel %sp,%a1 | switch_stack pointer
717 lwi r1, r1, TS_THREAD_INFO; !! 81 lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
718 addik r1, r1, THREAD_SIZE; !! 82 lea %sp@(-84),%sp | leave a gap
719 tophys(r1,r1); !! 83 movel %a1,%sp@-
720 /* save registers */ !! 84 movel %a0,%sp@-
721 addik r1, r1, -PT_SIZE; !! 85 jbsr do_sigreturn
722 SAVE_REGS !! 86 jra 1f | shared with rt_sigreturn()
723 /* calculate mode */ !! 87
724 swi r0, r1, PT_MODE; !! 88 ENTRY(sys_rt_sigreturn)
725 lwi r11, r0, TOPHYS(PER_CPU(ENTRY_ !! 89 SAVE_SWITCH_STACK
726 swi r11, r1, PT_R1; !! 90 movel %sp,%a1 | switch_stack pointer
727 clear_ums; !! 91 lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
728 2: !! 92 lea %sp@(-84),%sp | leave a gap
729 lwi CURRENT_TASK, r0, TOPHYS(PER_C !! 93 movel %a1,%sp@-
730 tovirt(r1,r1) !! 94 movel %a0,%sp@-
731 addik r15, r0, irq_call; !! 95 | stack contents:
732 irq_call:rtbd r0, do_IRQ; !! 96 | [original pt_regs address] [original switch_stack address]
733 addik r5, r1, 0; !! 97 | [gap] [switch_stack] [pt_regs] [exception frame]
734 !! 98 jbsr do_rt_sigreturn
735 /* MS: we are in virtual mode */ <<
736 ret_from_irq: <<
737 lwi r11, r1, PT_MODE; <<
738 bnei r11, 2f; <<
739 99
740 1: 100 1:
741 lwi r11, CURRENT_TASK, TS_THREAD_I !! 101 | stack contents now:
742 lwi r19, r11, TI_FLAGS; /* MS: get !! 102 | [original pt_regs address] [original switch_stack address]
743 andi r11, r19, _TIF_NEED_RESCHED; !! 103 | [unused part of the gap] [moved switch_stack] [moved pt_regs]
744 beqi r11, 5f !! 104 | [replacement exception frame]
745 bralid r15, schedule; !! 105 | return value of do_{rt_,}sigreturn() points to moved switch_stack.
746 nop; /* delay slot */ !! 106
747 bri 1b !! 107 movel %d0,%sp | discard the leftover junk
748 !! 108 RESTORE_SWITCH_STACK
749 /* Maybe handle a signal */ !! 109 | stack contents now is just [syscall return address] [pt_regs] [frame]
750 5: andi r11, r19, _TIF_SIGPENDING | _T !! 110 | return pt_regs.d0
751 beqid r11, no_intr_resched !! 111 movel %sp@(PT_OFF_D0+4),%d0
752 /* Handle a signal return; Pending signals sho !! 112 rts
753 addik r5, r1, 0; /* Arg 1: struct pt !! 113
754 bralid r15, do_notify_resume; /* Han !! 114 ENTRY(buserr)
755 addi r6, r0, 0; /* Arg 2: int in_sy !! 115 SAVE_ALL_INT
756 bri 1b !! 116 GET_CURRENT(%d0)
757 !! 117 movel %sp,%sp@- | stack frame pointer argument
758 /* Finally, return to user state. */ !! 118 jbsr buserr_c
759 no_intr_resched: !! 119 addql #4,%sp
760 /* Disable interrupts, we are now committe !! 120 jra ret_from_exception
761 disable_irq !! 121
762 swi CURRENT_TASK, r0, PER_CPU(CURR !! 122 ENTRY(trap)
763 VM_OFF; !! 123 SAVE_ALL_INT
764 tophys(r1,r1); !! 124 GET_CURRENT(%d0)
765 RESTORE_REGS !! 125 movel %sp,%sp@- | stack frame pointer argument
766 addik r1, r1, PT_SIZE /* MS: Clean u !! 126 jbsr trap_c
767 lwi r1, r1, PT_R1 - PT_SIZE; !! 127 addql #4,%sp
768 bri 6f; !! 128 jra ret_from_exception
769 /* MS: Return to kernel state. */ !! 129
770 2: !! 130 | After a fork we jump here directly from resume,
771 #ifdef CONFIG_PREEMPTION !! 131 | so that %d1 contains the previous task
772 lwi r11, CURRENT_TASK, TS_THREAD_I !! 132 | schedule_tail now used regardless of CONFIG_SMP
773 /* MS: get preempt_count from thread i !! 133 ENTRY(ret_from_fork)
774 lwi r5, r11, TI_PREEMPT_COUNT; !! 134 movel %d1,%sp@-
775 bgti r5, restore; !! 135 jsr schedule_tail
776 !! 136 addql #4,%sp
777 lwi r5, r11, TI_FLAGS; !! 137 jra ret_from_exception
778 andi r5, r5, _TIF_NEED_RESCHED; !! 138
779 beqi r5, restore /* if zero jump ov !! 139 ENTRY(ret_from_kernel_thread)
780 !! 140 | a3 contains the kernel thread payload, d7 - its argument
781 /* interrupts are off that's why I am !! 141 movel %d1,%sp@-
782 bralid r15, preempt_schedule_irq !! 142 jsr schedule_tail
783 nop !! 143 movel %d7,(%sp)
784 restore: !! 144 jsr %a3@
785 #endif !! 145 addql #4,%sp
786 VM_OFF /* MS: turn off MMU */ !! 146 jra ret_from_exception
787 tophys(r1,r1) !! 147
788 RESTORE_REGS !! 148 #if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
789 addik r1, r1, PT_SIZE /* MS: Clean u !! 149
790 tovirt(r1,r1); !! 150 #ifdef TRAP_DBG_INTERRUPT
791 6: !! 151
792 IRQ_return: /* MS: Make global symbol for debu !! 152 .globl dbginterrupt
793 rtid r14, 0 !! 153 ENTRY(dbginterrupt)
794 nop !! 154 SAVE_ALL_INT
795 !! 155 GET_CURRENT(%d0)
796 #ifdef CONFIG_MB_MANAGER !! 156 movel %sp,%sp@- /* stack frame pointer argument */
797 !! 157 jsr dbginterrupt_c
798 #define PT_PID PT_SIZE !! 158 addql #4,%sp
799 #define PT_TLBI PT_SIZE + 4 !! 159 jra ret_from_exception
800 #define PT_ZPR PT_SIZE + 8 !! 160 #endif
801 #define PT_TLBL0 PT_SIZE + 12 !! 161
802 #define PT_TLBH0 PT_SIZE + 16 !! 162 ENTRY(reschedule)
803 !! 163 /* save top of frame */
804 C_ENTRY(_xtmr_manager_reset): !! 164 pea %sp@
805 lwi r1, r0, xmb_manager_stackpoint !! 165 jbsr set_esp0
806 !! 166 addql #4,%sp
807 /* Restore MSR */ !! 167 pea ret_from_exception
808 lwi r2, r1, PT_MSR !! 168 jmp schedule
809 mts rmsr, r2 !! 169
810 bri 4 !! 170 ENTRY(ret_from_user_signal)
811 !! 171 moveq #__NR_sigreturn,%d0
812 /* restore Special purpose registers * !! 172 trap #0
813 lwi r2, r1, PT_PID !! 173
814 mts rpid, r2 !! 174 ENTRY(ret_from_user_rt_signal)
815 !! 175 movel #__NR_rt_sigreturn,%d0
816 lwi r2, r1, PT_TLBI !! 176 trap #0
817 mts rtlbx, r2 <<
818 <<
819 lwi r2, r1, PT_ZPR <<
820 mts rzpr, r2 <<
821 <<
822 #if CONFIG_XILINX_MICROBLAZE0_USE_FPU <<
823 lwi r2, r1, PT_FSR <<
824 mts rfsr, r2 <<
825 #endif <<
826 <<
827 /* restore all the tlb's */ <<
828 addik r3, r0, TOPHYS(tlb_skip) <<
829 addik r6, r0, PT_TLBL0 <<
830 addik r7, r0, PT_TLBH0 <<
831 restore_tlb: <<
832 add r6, r6, r1 <<
833 add r7, r7, r1 <<
834 lwi r2, r6, 0 <<
835 mts rtlblo, r2 <<
836 lwi r2, r7, 0 <<
837 mts rtlbhi, r2 <<
838 addik r6, r6, 4 <<
839 addik r7, r7, 4 <<
840 bgtid r3, restore_tlb <<
841 addik r3, r3, -1 <<
842 <<
843 lwi r5, r0, TOPHYS(xmb_manager_dev <<
844 lwi r8, r0, TOPHYS(xmb_manager_res <<
845 set_vms <<
846 /* return from reset need -8 to adjust <<
847 addik r15, r0, ret_from_reset - 8 <<
848 rtbd r8, 0 <<
849 nop <<
850 <<
851 ret_from_reset: <<
852 set_bip /* Ints masked for state resto <<
853 VM_OFF <<
854 /* MS: Restore all regs */ <<
855 RESTORE_REGS <<
856 lwi r14, r1, PT_R14 <<
857 lwi r16, r1, PT_PC <<
858 addik r1, r1, PT_SIZE + 36 <<
859 rtbd r16, 0 <<
860 nop <<
861 <<
862 /* <<
863 * Break handler for MB Manager. Enter to _xmb <<
864 * injecting fault in one of the TMR Microblaz <<
865 * FIXME: This break handler supports getting <<
866 * called from kernel space only. <<
867 */ <<
868 C_ENTRY(_xmb_manager_break): <<
869 /* <<
870 * Reserve memory in the stack for con <<
871 * (which includes memory for storing <<
872 */ <<
873 addik r1, r1, -PT_SIZE - 36 <<
874 swi r1, r0, xmb_manager_stackpoint <<
875 SAVE_REGS <<
876 swi r14, r1, PT_R14 /* rewrite sav <<
877 swi r16, r1, PT_PC; /* PC and r16 <<
878 <<
879 lwi r6, r0, TOPHYS(xmb_manager_bas <<
880 lwi r7, r0, TOPHYS(xmb_manager_crv <<
881 /* <<
882 * When the break vector gets asserted <<
883 * the break signal must be blocked be <<
884 * break handler, below code configure <<
885 * control register to block break sig <<
886 */ <<
887 swi r7, r6, 0 <<
888 <<
889 /* Save the special purpose registers <<
890 mfs r2, rpid <<
891 swi r2, r1, PT_PID <<
892 <<
893 mfs r2, rtlbx <<
894 swi r2, r1, PT_TLBI <<
895 <<
896 mfs r2, rzpr <<
897 swi r2, r1, PT_ZPR <<
898 177
899 #if CONFIG_XILINX_MICROBLAZE0_USE_FPU !! 178 #else
900 mfs r2, rfsr <<
901 swi r2, r1, PT_FSR <<
902 #endif <<
903 mfs r2, rmsr <<
904 swi r2, r1, PT_MSR <<
905 179
906 /* Save all the tlb's */ !! 180 do_trace_entry:
907 addik r3, r0, TOPHYS(tlb_skip) !! 181 movel #-ENOSYS,%sp@(PT_OFF_D0)| needed for strace
908 addik r6, r0, PT_TLBL0 !! 182 subql #4,%sp
909 addik r7, r0, PT_TLBH0 !! 183 SAVE_SWITCH_STACK
910 save_tlb: !! 184 jbsr syscall_trace
911 add r6, r6, r1 !! 185 RESTORE_SWITCH_STACK
912 add r7, r7, r1 !! 186 addql #4,%sp
913 mfs r2, rtlblo !! 187 movel %sp@(PT_OFF_ORIG_D0),%d0
914 swi r2, r6, 0 !! 188 cmpl #NR_syscalls,%d0
915 mfs r2, rtlbhi !! 189 jcs syscall
916 swi r2, r7, 0 !! 190 badsys:
917 addik r6, r6, 4 !! 191 movel #-ENOSYS,%sp@(PT_OFF_D0)
918 addik r7, r7, 4 !! 192 jra ret_from_syscall
919 bgtid r3, save_tlb !! 193
920 addik r3, r3, -1 !! 194 do_trace_exit:
921 !! 195 subql #4,%sp
922 lwi r5, r0, TOPHYS(xmb_manager_dev !! 196 SAVE_SWITCH_STACK
923 lwi r8, r0, TOPHYS(xmb_manager_cal !! 197 jbsr syscall_trace
924 /* return from break need -8 to adjust !! 198 RESTORE_SWITCH_STACK
925 addik r15, r0, ret_from_break - 8 !! 199 addql #4,%sp
926 rtbd r8, 0 !! 200 jra .Lret_from_exception
927 nop !! 201
928 !! 202 ENTRY(system_call)
929 ret_from_break: !! 203 SAVE_ALL_SYS
930 /* flush the d-cache */ !! 204
931 bralid r15, mb_flush_dcache !! 205 GET_CURRENT(%d1)
932 nop !! 206 movel %d1,%a1
>> 207
>> 208 | save top of frame
>> 209 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
>> 210
>> 211 | syscall trace?
>> 212 tstb %a1@(TINFO_FLAGS+2)
>> 213 jmi do_trace_entry
>> 214 cmpl #NR_syscalls,%d0
>> 215 jcc badsys
>> 216 syscall:
>> 217 jbsr @(sys_call_table,%d0:l:4)@(0)
>> 218 movel %d0,%sp@(PT_OFF_D0) | save the return value
>> 219 ret_from_syscall:
>> 220 |oriw #0x0700,%sr
>> 221 movel %curptr@(TASK_STACK),%a1
>> 222 movew %a1@(TINFO_FLAGS+2),%d0
>> 223 jne syscall_exit_work
>> 224 1: RESTORE_ALL
>> 225
>> 226 syscall_exit_work:
>> 227 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
>> 228 bnes 1b | if so, skip resched, signals
>> 229 lslw #1,%d0
>> 230 jcs do_trace_exit
>> 231 jmi do_delayed_trace
>> 232 lslw #8,%d0
>> 233 jne do_signal_return
>> 234 pea resume_userspace
>> 235 jra schedule
>> 236
>> 237
>> 238 ENTRY(ret_from_exception)
>> 239 .Lret_from_exception:
>> 240 btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
>> 241 bnes 1f | if so, skip resched, signals
>> 242 | only allow interrupts when we are really the last one on the
>> 243 | kernel stack, otherwise stack overflow can occur during
>> 244 | heavy interrupt load
>> 245 andw #ALLOWINT,%sr
>> 246
>> 247 resume_userspace:
>> 248 movel %curptr@(TASK_STACK),%a1
>> 249 moveb %a1@(TINFO_FLAGS+3),%d0
>> 250 jne exit_work
>> 251 1: RESTORE_ALL
>> 252
>> 253 exit_work:
>> 254 | save top of frame
>> 255 movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
>> 256 lslb #1,%d0
>> 257 jne do_signal_return
>> 258 pea resume_userspace
>> 259 jra schedule
>> 260
>> 261
>> 262 do_signal_return:
>> 263 |andw #ALLOWINT,%sr
>> 264 subql #4,%sp | dummy return address
>> 265 SAVE_SWITCH_STACK
>> 266 pea %sp@(SWITCH_STACK_SIZE)
>> 267 bsrl do_notify_resume
>> 268 addql #4,%sp
>> 269 RESTORE_SWITCH_STACK
>> 270 addql #4,%sp
>> 271 jbra resume_userspace
>> 272
>> 273 do_delayed_trace:
>> 274 bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR
>> 275 pea 1 | send SIGTRAP
>> 276 movel %curptr,%sp@-
>> 277 pea LSIGTRAP
>> 278 jbsr send_sig
>> 279 addql #8,%sp
>> 280 addql #4,%sp
>> 281 jbra resume_userspace
>> 282
>> 283
>> 284 /* This is the main interrupt handler for autovector interrupts */
>> 285
>> 286 ENTRY(auto_inthandler)
>> 287 SAVE_ALL_INT
>> 288 GET_CURRENT(%d0)
>> 289 | put exception # in d0
>> 290 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
>> 291 subw #VEC_SPUR,%d0
>> 292
>> 293 movel %sp,%sp@-
>> 294 movel %d0,%sp@- | put vector # on stack
>> 295 auto_irqhandler_fixup = . + 2
>> 296 jsr do_IRQ | process the IRQ
>> 297 addql #8,%sp | pop parameters off stack
>> 298 jra ret_from_exception
>> 299
>> 300 /* Handler for user defined interrupt vectors */
>> 301
>> 302 ENTRY(user_inthandler)
>> 303 SAVE_ALL_INT
>> 304 GET_CURRENT(%d0)
>> 305 | put exception # in d0
>> 306 bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
>> 307 user_irqvec_fixup = . + 2
>> 308 subw #VEC_USER,%d0
>> 309
>> 310 movel %sp,%sp@-
>> 311 movel %d0,%sp@- | put vector # on stack
>> 312 jsr do_IRQ | process the IRQ
>> 313 addql #8,%sp | pop parameters off stack
>> 314 jra ret_from_exception
>> 315
>> 316 /* Handler for uninitialized and spurious interrupts */
>> 317
>> 318 ENTRY(bad_inthandler)
>> 319 SAVE_ALL_INT
>> 320 GET_CURRENT(%d0)
>> 321
>> 322 movel %sp,%sp@-
>> 323 jsr handle_badint
>> 324 addql #4,%sp
>> 325 jra ret_from_exception
933 326
>> 327 resume:
934 /* 328 /*
935 * To make sure microblaze i-cache is !! 329 * Beware - when entering resume, prev (the current task) is
936 * invalidate the i-cache. !! 330 * in a0, next (the new task) is in a1,so don't change these
>> 331 * registers until their contents are no longer needed.
937 */ 332 */
938 bralid r15, mb_invalidate_icache <<
939 nop <<
940 333
941 set_bip; /* Ints masked for state rest !! 334 /* save sr */
942 VM_OFF; !! 335 movew %sr,%a0@(TASK_THREAD+THREAD_SR)
943 mbar 1 <<
944 mbar 2 <<
945 bri 4 <<
946 suspend <<
947 nop <<
948 #endif <<
949 336
950 /* !! 337 /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
951 * Debug trap for KGDB. Enter to _debug_except !! 338 movec %sfc,%d0
952 * and call handling function with saved pt_re !! 339 movew %d0,%a0@(TASK_THREAD+THREAD_FC)
953 */ !! 340
954 C_ENTRY(_debug_exception): !! 341 /* save usp */
955 /* BIP bit is set on entry, no interru !! 342 /* it is better to use a movel here instead of a movew 8*) */
956 swi r1, r0, TOPHYS(PER_CPU(ENTRY_S !! 343 movec %usp,%d0
957 !! 344 movel %d0,%a0@(TASK_THREAD+THREAD_USP)
958 mfs r1, rmsr !! 345
959 nop !! 346 /* save non-scratch registers on stack */
960 andi r1, r1, MSR_UMS !! 347 SAVE_SWITCH_STACK
961 bnei r1, 1f !! 348
962 /* MS: Kernel-mode state save - kgdb */ !! 349 /* save current kernel stack pointer */
963 lwi r1, r0, TOPHYS(PER_CPU(ENTRY_S !! 350 movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
964 !! 351
965 /* BIP bit is set on entry, no interru !! 352 /* save floating point context */
966 addik r1, r1, CONFIG_KERNEL_BASE_ADD !! 353 #ifndef CONFIG_M68KFPU_EMU_ONLY
967 SAVE_REGS; !! 354 #ifdef CONFIG_M68KFPU_EMU
968 /* save all regs to pt_reg structure * !! 355 tstl m68k_fputype
969 swi r0, r1, PT_R0; /* R0 must be !! 356 jeq 3f
970 swi r14, r1, PT_R14 /* rewrite sav !! 357 #endif
971 swi r16, r1, PT_PC; /* PC and r16 !! 358 fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
972 /* save special purpose registers to p !! 359
973 mfs r11, rear; !! 360 #if defined(CONFIG_M68060)
974 swi r11, r1, PT_EAR; !! 361 #if !defined(CPU_M68060_ONLY)
975 mfs r11, resr; !! 362 btst #3,m68k_cputype+3
976 swi r11, r1, PT_ESR; !! 363 beqs 1f
977 mfs r11, rfsr; !! 364 #endif
978 swi r11, r1, PT_FSR; !! 365 /* The 060 FPU keeps status in bits 15-8 of the first longword */
979 !! 366 tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
980 /* stack pointer is in physical addres !! 367 jeq 3f
981 * by PT_SIZE but we need to get corre !! 368 #if !defined(CPU_M68060_ONLY)
982 addik r11, r1, CONFIG_KERNEL_START - !! 369 jra 2f
983 swi r11, r1, PT_R1 !! 370 #endif
984 /* MS: r31 - current pointer isn't cha !! 371 #endif /* CONFIG_M68060 */
985 tovirt(r1,r1) !! 372 #if !defined(CPU_M68060_ONLY)
986 #ifdef CONFIG_KGDB !! 373 1: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
987 addi r5, r1, 0 /* pass pt_reg addre !! 374 jeq 3f
988 addik r15, r0, dbtrap_call; /* retur <<
989 rtbd r0, microblaze_kgdb_break <<
990 nop; <<
991 #endif <<
992 /* MS: Place handler for brki from ker <<
993 * It is very unlikely that another br <<
994 bri 0 <<
995 <<
996 /* MS: User-mode state save - gdb */ <<
997 1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT <<
998 tophys(r1,r1); <<
999 lwi r1, r1, TS_THREAD_INFO; /* get <<
1000 addik r1, r1, THREAD_SIZE; /* ca <<
1001 tophys(r1,r1); <<
1002 <<
1003 addik r1, r1, -PT_SIZE; /* Make roo <<
1004 SAVE_REGS; <<
1005 swi r16, r1, PT_PC; /* Save LP */ <<
1006 swi r0, r1, PT_MODE; /* Was in us <<
1007 lwi r11, r0, TOPHYS(PER_CPU(ENTRY <<
1008 swi r11, r1, PT_R1; /* Store user <<
1009 lwi CURRENT_TASK, r0, TOPHYS(PER_ <<
1010 tovirt(r1,r1) <<
1011 set_vms; <<
1012 addik r5, r1, 0; <<
1013 addik r15, r0, dbtrap_call; <<
1014 dbtrap_call: /* Return point for kernel/user <<
1015 rtbd r0, sw_exception <<
1016 nop <<
1017 <<
1018 /* MS: The first instruction for the <<
1019 set_bip; /* Ints masked for state res <<
1020 lwi r11, r1, PT_MODE; <<
1021 bnei r11, 2f; <<
1022 /* MS: Return to user space - gdb */ <<
1023 1: <<
1024 /* Get current task ptr into r11 */ <<
1025 lwi r11, CURRENT_TASK, TS_THREAD_ <<
1026 lwi r19, r11, TI_FLAGS; /* ge <<
1027 andi r11, r19, _TIF_NEED_RESCHED; <<
1028 beqi r11, 5f; <<
1029 <<
1030 /* Call the scheduler before returnin <<
1031 bralid r15, schedule; /* Call sched <<
1032 nop; /* de <<
1033 bri 1b <<
1034 <<
1035 /* Maybe handle a signal */ <<
1036 5: andi r11, r19, _TIF_SIGPENDING | _ <<
1037 beqi r11, 4f; /* Si <<
1038 <<
1039 addik r5, r1, 0; /* Ar <<
1040 bralid r15, do_notify_resume; /* Ha <<
1041 addi r6, r0, 0; /* Arg 2: int <<
1042 bri 1b <<
1043 <<
1044 /* Finally, return to user state. */ <<
1045 4: swi CURRENT_TASK, r0, PER_CPU(CUR <<
1046 VM_OFF; <<
1047 tophys(r1,r1); <<
1048 /* MS: Restore all regs */ <<
1049 RESTORE_REGS_RTBD <<
1050 addik r1, r1, PT_SIZE /* Clean up <<
1051 lwi r1, r1, PT_R1 - PT_SIZE; /* R <<
1052 DBTRAP_return_user: /* MS: Make global symbol <<
1053 rtbd r16, 0; /* MS: Instructions t <<
1054 nop; <<
1055 <<
1056 /* MS: Return to kernel state - kgdb */ <<
1057 2: VM_OFF; <<
1058 tophys(r1,r1); <<
1059 /* MS: Restore all regs */ <<
1060 RESTORE_REGS_RTBD <<
1061 lwi r14, r1, PT_R14; <<
1062 lwi r16, r1, PT_PC; <<
1063 addik r1, r1, PT_SIZE; /* MS: Clean <<
1064 tovirt(r1,r1); <<
1065 DBTRAP_return_kernel: /* MS: Make global symb <<
1066 rtbd r16, 0; /* MS: Instructions t <<
1067 nop; <<
1068 <<
1069 <<
1070 ENTRY(_switch_to) <<
1071 /* prepare return value */ <<
1072 addk r3, r0, CURRENT_TASK <<
1073 <<
1074 /* save registers in cpu_context */ <<
1075 /* use r11 and r12, volatile register <<
1076 /* give start of cpu_context for prev <<
1077 addik r11, r5, TI_CPU_CONTEXT <<
1078 swi r1, r11, CC_R1 <<
1079 swi r2, r11, CC_R2 <<
1080 /* skip volatile registers. <<
1081 * they are saved on stack when we ju <<
1082 /* dedicated registers */ <<
1083 swi r13, r11, CC_R13 <<
1084 swi r14, r11, CC_R14 <<
1085 swi r15, r11, CC_R15 <<
1086 swi r16, r11, CC_R16 <<
1087 swi r17, r11, CC_R17 <<
1088 swi r18, r11, CC_R18 <<
1089 /* save non-volatile registers */ <<
1090 swi r19, r11, CC_R19 <<
1091 swi r20, r11, CC_R20 <<
1092 swi r21, r11, CC_R21 <<
1093 swi r22, r11, CC_R22 <<
1094 swi r23, r11, CC_R23 <<
1095 swi r24, r11, CC_R24 <<
1096 swi r25, r11, CC_R25 <<
1097 swi r26, r11, CC_R26 <<
1098 swi r27, r11, CC_R27 <<
1099 swi r28, r11, CC_R28 <<
1100 swi r29, r11, CC_R29 <<
1101 swi r30, r11, CC_R30 <<
1102 /* special purpose registers */ <<
1103 mfs r12, rmsr <<
1104 swi r12, r11, CC_MSR <<
1105 mfs r12, rear <<
1106 swi r12, r11, CC_EAR <<
1107 mfs r12, resr <<
1108 swi r12, r11, CC_ESR <<
1109 mfs r12, rfsr <<
1110 swi r12, r11, CC_FSR <<
1111 <<
1112 /* update r31, the current-give me po <<
1113 lwi CURRENT_TASK, r6, TI_TASK <<
1114 /* stored it to current_save too */ <<
1115 swi CURRENT_TASK, r0, PER_CPU(CUR <<
1116 <<
1117 /* get new process' cpu context and r <<
1118 /* give me start where start context <<
1119 addik r11, r6, TI_CPU_CONTEXT <<
1120 <<
1121 /* non-volatile registers */ <<
1122 lwi r30, r11, CC_R30 <<
1123 lwi r29, r11, CC_R29 <<
1124 lwi r28, r11, CC_R28 <<
1125 lwi r27, r11, CC_R27 <<
1126 lwi r26, r11, CC_R26 <<
1127 lwi r25, r11, CC_R25 <<
1128 lwi r24, r11, CC_R24 <<
1129 lwi r23, r11, CC_R23 <<
1130 lwi r22, r11, CC_R22 <<
1131 lwi r21, r11, CC_R21 <<
1132 lwi r20, r11, CC_R20 <<
1133 lwi r19, r11, CC_R19 <<
1134 /* dedicated registers */ <<
1135 lwi r18, r11, CC_R18 <<
1136 lwi r17, r11, CC_R17 <<
1137 lwi r16, r11, CC_R16 <<
1138 lwi r15, r11, CC_R15 <<
1139 lwi r14, r11, CC_R14 <<
1140 lwi r13, r11, CC_R13 <<
1141 /* skip volatile registers */ <<
1142 lwi r2, r11, CC_R2 <<
1143 lwi r1, r11, CC_R1 <<
1144 <<
1145 /* special purpose registers */ <<
1146 lwi r12, r11, CC_FSR <<
1147 mts rfsr, r12 <<
1148 lwi r12, r11, CC_MSR <<
1149 mts rmsr, r12 <<
1150 <<
1151 rtsd r15, 8 <<
1152 nop <<
1153 <<
1154 #ifdef CONFIG_MB_MANAGER <<
1155 .global xmb_inject_err <<
1156 .section .text <<
1157 .align 2 <<
1158 .ent xmb_inject_err <<
1159 .type xmb_inject_err, @function <<
1160 xmb_inject_err: <<
1161 addik r1, r1, -PT_SIZE <<
1162 SAVE_REGS <<
1163 <<
1164 /* Switch to real mode */ <<
1165 VM_OFF; <<
1166 set_bip; <<
1167 mbar 1 <<
1168 mbar 2 <<
1169 bralid r15, XMB_INJECT_ERR_OFFSET <<
1170 nop; <<
1171 <<
1172 /* enable virtual mode */ <<
1173 set_vms; <<
1174 /* barrier for instructions and data <<
1175 mbar 1 <<
1176 mbar 2 <<
1177 /* <<
1178 * Enable Interrupts, Virtual Protect <<
1179 * initial state for all possible ent <<
1180 */ <<
1181 rtbd r0, 1f <<
1182 nop; <<
1183 1: <<
1184 RESTORE_REGS <<
1185 addik r1, r1, PT_SIZE <<
1186 rtsd r15, 8; <<
1187 nop; <<
1188 .end xmb_inject_err <<
1189 <<
1190 .section .data <<
1191 .global xmb_manager_dev <<
1192 .global xmb_manager_baseaddr <<
1193 .global xmb_manager_crval <<
1194 .global xmb_manager_callback <<
1195 .global xmb_manager_reset_callback <<
1196 .global xmb_manager_stackpointer <<
1197 .align 4 <<
1198 xmb_manager_dev: <<
1199 .long 0 <<
1200 xmb_manager_baseaddr: <<
1201 .long 0 <<
1202 xmb_manager_crval: <<
1203 .long 0 <<
1204 xmb_manager_callback: <<
1205 .long 0 <<
1206 xmb_manager_reset_callback: <<
1207 .long 0 <<
1208 xmb_manager_stackpointer: <<
1209 .long 0 <<
1210 <<
1211 /* <<
1212 * When the break vector gets asserted becaus <<
1213 * the break signal must be blocked before ex <<
1214 * break handler, Below api updates the manag <<
1215 * control register and error count callback <<
1216 * which will be used by the break handler to <<
1217 * break and call the callback function. <<
1218 */ <<
1219 .global xmb_manager_register <<
1220 .section .text <<
1221 .align 2 <<
1222 .ent xmb_manager_register <<
1223 .type xmb_manager_register, @function <<
1224 xmb_manager_register: <<
1225 swi r5, r0, xmb_manager_baseaddr <<
1226 swi r6, r0, xmb_manager_crval <<
1227 swi r7, r0, xmb_manager_callback <<
1228 swi r8, r0, xmb_manager_dev <<
1229 swi r9, r0, xmb_manager_reset_cal <<
1230 <<
1231 rtsd r15, 8; <<
1232 nop; <<
1233 .end xmb_manager_register <<
1234 #endif 375 #endif
>> 376 2: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
>> 377 fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
>> 378 3:
>> 379 #endif /* CONFIG_M68KFPU_EMU_ONLY */
>> 380 /* Return previous task in %d1 */
>> 381 movel %curptr,%d1
>> 382
>> 383 /* switch to new task (a1 contains new task) */
>> 384 movel %a1,%curptr
>> 385
>> 386 /* restore floating point context */
>> 387 #ifndef CONFIG_M68KFPU_EMU_ONLY
>> 388 #ifdef CONFIG_M68KFPU_EMU
>> 389 tstl m68k_fputype
>> 390 jeq 4f
>> 391 #endif
>> 392 #if defined(CONFIG_M68060)
>> 393 #if !defined(CPU_M68060_ONLY)
>> 394 btst #3,m68k_cputype+3
>> 395 beqs 1f
>> 396 #endif
>> 397 /* The 060 FPU keeps status in bits 15-8 of the first longword */
>> 398 tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
>> 399 jeq 3f
>> 400 #if !defined(CPU_M68060_ONLY)
>> 401 jra 2f
>> 402 #endif
>> 403 #endif /* CONFIG_M68060 */
>> 404 #if !defined(CPU_M68060_ONLY)
>> 405 1: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
>> 406 jeq 3f
>> 407 #endif
>> 408 2: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
>> 409 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
>> 410 3: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
>> 411 4:
>> 412 #endif /* CONFIG_M68KFPU_EMU_ONLY */
1235 413
1236 ENTRY(_reset) !! 414 /* restore the kernel stack pointer */
1237 VM_OFF !! 415 movel %a1@(TASK_THREAD+THREAD_KSP),%sp
1238 brai 0; /* Jump to reset vector */ <<
1239 <<
1240 /* These are compiled and loaded into <<
1241 * copied into place in mach_early_se <<
1242 .section .init.ivt, "ax" <<
1243 #if CONFIG_MANUAL_RESET_VECTOR && !defined(CO <<
1244 .org 0x0 <<
1245 brai CONFIG_MANUAL_RESET_VECTOR <<
1246 #elif defined(CONFIG_MB_MANAGER) <<
1247 .org 0x0 <<
1248 brai TOPHYS(_xtmr_manager_reset); <<
1249 #endif <<
1250 .org 0x8 <<
1251 brai TOPHYS(_user_exception); /* s <<
1252 .org 0x10 <<
1253 brai TOPHYS(_interrupt); /* In <<
1254 #ifdef CONFIG_MB_MANAGER <<
1255 .org 0x18 <<
1256 brai TOPHYS(_xmb_manager_break); <<
1257 #else <<
1258 .org 0x18 <<
1259 brai TOPHYS(_debug_exception); <<
1260 #endif <<
1261 .org 0x20 <<
1262 brai TOPHYS(_hw_exception_handler) <<
1263 416
1264 #ifdef CONFIG_MB_MANAGER !! 417 /* restore non-scratch registers */
1265 /* !! 418 RESTORE_SWITCH_STACK
1266 * For TMR Inject API which injects t <<
1267 * be executed from LMB. <<
1268 * TMR Inject is programmed with addr <<
1269 * when program counter matches with <<
1270 * be injected. 0x200 is expected to <<
1271 * offset, hence used for this api. <<
1272 */ <<
1273 .org XMB_INJECT_ERR_OFFSET <<
1274 xmb_inject_error: <<
1275 nop <<
1276 rtsd r15, 8 <<
1277 nop <<
1278 #endif <<
1279 419
1280 .section .rodata,"a" !! 420 /* restore user stack pointer */
1281 #include "syscall_table.S" !! 421 movel %a1@(TASK_THREAD+THREAD_USP),%a0
>> 422 movel %a0,%usp
1282 423
1283 syscall_table_size=(.-sys_call_table) !! 424 /* restore fs (sfc,%dfc) */
>> 425 movew %a1@(TASK_THREAD+THREAD_FC),%a0
>> 426 movec %a0,%sfc
>> 427 movec %a0,%dfc
1284 428
1285 type_SYSCALL: !! 429 /* restore status register */
1286 .ascii "SYSCALL\0" !! 430 movew %a1@(TASK_THREAD+THREAD_SR),%sr
1287 type_IRQ: <<
1288 .ascii "IRQ\0" <<
1289 type_IRQ_PREEMPT: <<
1290 .ascii "IRQ (PREEMPTED)\0" <<
1291 type_SYSCALL_PREEMPT: <<
1292 .ascii " SYSCALL (PREEMPTED)\0" <<
1293 431
1294 /* !! 432 rts
1295 * Trap decoding for stack unwinder <<
1296 * Tuples are (start addr, end addr, <<
1297 * If return address lies on [start a <<
1298 * unwinder displays 'string' <<
1299 */ <<
1300 433
1301 .align 4 !! 434 #endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
1302 .global microblaze_trap_handlers <<
1303 microblaze_trap_handlers: <<
1304 /* Exact matches come first */ <<
1305 .word ret_from_trap; .word ret_from_t <<
1306 .word ret_from_irq ; .word ret_from_i <<
1307 /* Fuzzy matches go here */ <<
1308 .word ret_from_irq ; .word no_intr_re <<
1309 .word ret_from_trap; .word TRAP_retur <<
1310 /* End of table */ <<
1311 .word 0 ; .word 0 <<
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