| blob | 3567d54f8cee7533ecba41847c5f9957d9481296 |
1 /*
2 * This file contains the light-weight system call handlers (fsyscall-handlers).
3 *
4 * Copyright (C) 2003 Hewlett-Packard Co
5 * David Mosberger-Tang <davidm@hpl.hp.com>
6 *
7 * 25-Sep-03 davidm Implement fsys_rt_sigprocmask().
8 * 18-Feb-03 louisk Implement fsys_gettimeofday().
9 * 28-Feb-03 davidm Fixed several bugs in fsys_gettimeofday(). Tuned it some more,
10 * probably broke it along the way... ;-)
11 * 13-Jul-04 clameter Implement fsys_clock_gettime and revise fsys_gettimeofday to make
12 * it capable of using memory based clocks without falling back to C code.
13 * 08-Feb-07 Fenghua Yu Implement fsys_getcpu.
14 *
15 */
17 #include <asm/asmmacro.h>
18 #include <asm/errno.h>
19 #include <asm/asm-offsets.h>
20 #include <asm/percpu.h>
21 #include <asm/thread_info.h>
22 #include <asm/sal.h>
23 #include <asm/signal.h>
24 #include <asm/system.h>
25 #include <asm/unistd.h>
27 #include "entry.h"
28 #include "paravirt_inst.h"
30 /*
31 * See Documentation/ia64/fsys.txt for details on fsyscalls.
32 *
33 * On entry to an fsyscall handler:
34 * r10 = 0 (i.e., defaults to "successful syscall return")
35 * r11 = saved ar.pfs (a user-level value)
36 * r15 = system call number
37 * r16 = "current" task pointer (in normal kernel-mode, this is in r13)
38 * r32-r39 = system call arguments
39 * b6 = return address (a user-level value)
40 * ar.pfs = previous frame-state (a user-level value)
41 * PSR.be = cleared to zero (i.e., little-endian byte order is in effect)
42 * all other registers may contain values passed in from user-mode
43 *
44 * On return from an fsyscall handler:
45 * r11 = saved ar.pfs (as passed into the fsyscall handler)
46 * r15 = system call number (as passed into the fsyscall handler)
47 * r32-r39 = system call arguments (as passed into the fsyscall handler)
48 * b6 = return address (as passed into the fsyscall handler)
49 * ar.pfs = previous frame-state (as passed into the fsyscall handler)
50 */
52 ENTRY(fsys_ni_syscall)
53 .prologue
54 .altrp b6
55 .body
56 mov r8=ENOSYS
57 mov r10=-1
58 FSYS_RETURN
59 END(fsys_ni_syscall)
61 ENTRY(fsys_getpid)
62 .prologue
63 .altrp b6
64 .body
65 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16
66 ;;
67 ld8 r17=[r17] // r17 = current->group_leader
68 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
69 ;;
70 ld4 r9=[r9]
71 add r17=IA64_TASK_TGIDLINK_OFFSET,r17
72 ;;
73 and r9=TIF_ALLWORK_MASK,r9
74 ld8 r17=[r17] // r17 = current->group_leader->pids[PIDTYPE_PID].pid
75 ;;
76 add r8=IA64_PID_LEVEL_OFFSET,r17
77 ;;
78 ld4 r8=[r8] // r8 = pid->level
79 add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0]
80 ;;
81 shl r8=r8,IA64_UPID_SHIFT
82 ;;
83 add r17=r17,r8 // r17 = &pid->numbers[pid->level]
84 ;;
85 ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr
86 ;;
87 mov r17=0
88 ;;
89 cmp.ne p8,p0=0,r9
90 (p8) br.spnt.many fsys_fallback_syscall
91 FSYS_RETURN
92 END(fsys_getpid)
94 ENTRY(fsys_getppid)
95 .prologue
96 .altrp b6
97 .body
98 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16
99 ;;
100 ld8 r17=[r17] // r17 = current->group_leader
101 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
102 ;;
104 ld4 r9=[r9]
105 add r17=IA64_TASK_REAL_PARENT_OFFSET,r17 // r17 = ¤t->group_leader->real_parent
106 ;;
107 and r9=TIF_ALLWORK_MASK,r9
109 1: ld8 r18=[r17] // r18 = current->group_leader->real_parent
110 ;;
111 cmp.ne p8,p0=0,r9
112 add r8=IA64_TASK_TGID_OFFSET,r18 // r8 = ¤t->group_leader->real_parent->tgid
113 ;;
115 /*
116 * The .acq is needed to ensure that the read of tgid has returned its data before
117 * we re-check "real_parent".
118 */
119 ld4.acq r8=[r8] // r8 = current->group_leader->real_parent->tgid
120 #ifdef CONFIG_SMP
121 /*
122 * Re-read current->group_leader->real_parent.
123 */
124 ld8 r19=[r17] // r19 = current->group_leader->real_parent
125 (p8) br.spnt.many fsys_fallback_syscall
126 ;;
127 cmp.ne p6,p0=r18,r19 // did real_parent change?
128 mov r19=0 // i must not leak kernel bits...
129 (p6) br.cond.spnt.few 1b // yes -> redo the read of tgid and the check
130 ;;
131 mov r17=0 // i must not leak kernel bits...
132 mov r18=0 // i must not leak kernel bits...
133 #else
134 mov r17=0 // i must not leak kernel bits...
135 mov r18=0 // i must not leak kernel bits...
136 mov r19=0 // i must not leak kernel bits...
137 #endif
138 FSYS_RETURN
139 END(fsys_getppid)
141 ENTRY(fsys_set_tid_address)
142 .prologue
143 .altrp b6
144 .body
145 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
146 add r17=IA64_TASK_TGIDLINK_OFFSET,r16
147 ;;
148 ld4 r9=[r9]
149 tnat.z p6,p7=r32 // check argument register for being NaT
150 ld8 r17=[r17] // r17 = current->pids[PIDTYPE_PID].pid
151 ;;
152 and r9=TIF_ALLWORK_MASK,r9
153 add r8=IA64_PID_LEVEL_OFFSET,r17
154 add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16
155 ;;
156 ld4 r8=[r8] // r8 = pid->level
157 add r17=IA64_PID_UPID_OFFSET,r17 // r17 = &pid->numbers[0]
158 ;;
159 shl r8=r8,IA64_UPID_SHIFT
160 ;;
161 add r17=r17,r8 // r17 = &pid->numbers[pid->level]
162 ;;
163 ld4 r8=[r17] // r8 = pid->numbers[pid->level].nr
164 ;;
165 cmp.ne p8,p0=0,r9
166 mov r17=-1
167 ;;
168 (p6) st8 [r18]=r32
169 (p7) st8 [r18]=r17
170 (p8) br.spnt.many fsys_fallback_syscall
171 ;;
172 mov r17=0 // i must not leak kernel bits...
173 mov r18=0 // i must not leak kernel bits...
174 FSYS_RETURN
175 END(fsys_set_tid_address)
177 #if IA64_GTOD_LOCK_OFFSET !=0
178 #error fsys_gettimeofday incompatible with changes to struct fsyscall_gtod_data_t
179 #endif
180 #if IA64_ITC_JITTER_OFFSET !=0
181 #error fsys_gettimeofday incompatible with changes to struct itc_jitter_data_t
182 #endif
183 #define CLOCK_REALTIME 0
184 #define CLOCK_MONOTONIC 1
185 #define CLOCK_DIVIDE_BY_1000 0x4000
186 #define CLOCK_ADD_MONOTONIC 0x8000
188 ENTRY(fsys_gettimeofday)
189 .prologue
190 .altrp b6
191 .body
192 mov r31 = r32
193 tnat.nz p6,p0 = r33 // guard against NaT argument
194 (p6) br.cond.spnt.few .fail_einval
195 mov r30 = CLOCK_DIVIDE_BY_1000
196 ;;
197 .gettime:
198 // Register map
199 // Incoming r31 = pointer to address where to place result
200 // r30 = flags determining how time is processed
201 // r2,r3 = temp r4-r7 preserved
202 // r8 = result nanoseconds
203 // r9 = result seconds
204 // r10 = temporary storage for clock difference
205 // r11 = preserved: saved ar.pfs
206 // r12 = preserved: memory stack
207 // r13 = preserved: thread pointer
208 // r14 = address of mask / mask value
209 // r15 = preserved: system call number
210 // r16 = preserved: current task pointer
211 // r17 = (not used)
212 // r18 = (not used)
213 // r19 = address of itc_lastcycle
214 // r20 = struct fsyscall_gtod_data (= address of gtod_lock.sequence)
215 // r21 = address of mmio_ptr
216 // r22 = address of wall_time or monotonic_time
217 // r23 = address of shift / value
218 // r24 = address mult factor / cycle_last value
219 // r25 = itc_lastcycle value
220 // r26 = address clocksource cycle_last
221 // r27 = (not used)
222 // r28 = sequence number at the beginning of critcal section
223 // r29 = address of itc_jitter
224 // r30 = time processing flags / memory address
225 // r31 = pointer to result
226 // Predicates
227 // p6,p7 short term use
228 // p8 = timesource ar.itc
229 // p9 = timesource mmio64
230 // p10 = timesource mmio32 - not used
231 // p11 = timesource not to be handled by asm code
232 // p12 = memory time source ( = p9 | p10) - not used
233 // p13 = do cmpxchg with itc_lastcycle
234 // p14 = Divide by 1000
235 // p15 = Add monotonic
236 //
237 // Note that instructions are optimized for McKinley. McKinley can
238 // process two bundles simultaneously and therefore we continuously
239 // try to feed the CPU two bundles and then a stop.
241 add r2 = TI_FLAGS+IA64_TASK_SIZE,r16
242 tnat.nz p6,p0 = r31 // guard against Nat argument
243 (p6) br.cond.spnt.few .fail_einval
244 movl r20 = fsyscall_gtod_data // load fsyscall gettimeofday data address
245 ;;
246 ld4 r2 = [r2] // process work pending flags
247 movl r29 = itc_jitter_data // itc_jitter
248 add r22 = IA64_GTOD_WALL_TIME_OFFSET,r20 // wall_time
249 add r21 = IA64_CLKSRC_MMIO_OFFSET,r20
250 mov pr = r30,0xc000 // Set predicates according to function
251 ;;
252 and r2 = TIF_ALLWORK_MASK,r2
253 add r19 = IA64_ITC_LASTCYCLE_OFFSET,r29
254 (p15) add r22 = IA64_GTOD_MONO_TIME_OFFSET,r20 // monotonic_time
255 ;;
256 add r26 = IA64_CLKSRC_CYCLE_LAST_OFFSET,r20 // clksrc_cycle_last
257 cmp.ne p6, p0 = 0, r2 // Fallback if work is scheduled
258 (p6) br.cond.spnt.many fsys_fallback_syscall
259 ;;
260 // Begin critical section
261 .time_redo:
262 ld4.acq r28 = [r20] // gtod_lock.sequence, Must take first
263 ;;
264 and r28 = ~1,r28 // And make sequence even to force retry if odd
265 ;;
266 ld8 r30 = [r21] // clocksource->mmio_ptr
267 add r24 = IA64_CLKSRC_MULT_OFFSET,r20
268 ld4 r2 = [r29] // itc_jitter value
269 add r23 = IA64_CLKSRC_SHIFT_OFFSET,r20
270 add r14 = IA64_CLKSRC_MASK_OFFSET,r20
271 ;;
272 ld4 r3 = [r24] // clocksource mult value
273 ld8 r14 = [r14] // clocksource mask value
274 cmp.eq p8,p9 = 0,r30 // use cpu timer if no mmio_ptr
275 ;;
276 setf.sig f7 = r3 // Setup for mult scaling of counter
277 (p8) cmp.ne p13,p0 = r2,r0 // need itc_jitter compensation, set p13
278 ld4 r23 = [r23] // clocksource shift value
279 ld8 r24 = [r26] // get clksrc_cycle_last value
280 (p9) cmp.eq p13,p0 = 0,r30 // if mmio_ptr, clear p13 jitter control
281 ;;
282 .pred.rel.mutex p8,p9
283 MOV_FROM_ITC(p8, p6, r2, r10) // CPU_TIMER. 36 clocks latency!!!
284 (p9) ld8 r2 = [r30] // MMIO_TIMER. Could also have latency issues..
285 (p13) ld8 r25 = [r19] // get itc_lastcycle value
286 ld8 r9 = [r22],IA64_TIMESPEC_TV_NSEC_OFFSET // tv_sec
287 ;;
288 ld8 r8 = [r22],-IA64_TIMESPEC_TV_NSEC_OFFSET // tv_nsec
289 (p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm)
290 ;;
291 (p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared
292 sub r10 = r2,r24 // current_cycle - last_cycle
293 ;;
294 (p6) sub r10 = r25,r24 // time we got was less than last_cycle
295 (p7) mov ar.ccv = r25 // more than last_cycle. Prep for cmpxchg
296 ;;
297 (p7) cmpxchg8.rel r3 = [r19],r2,ar.ccv
298 ;;
299 (p7) cmp.ne p7,p0 = r25,r3 // if cmpxchg not successful
300 ;;
301 (p7) sub r10 = r3,r24 // then use new last_cycle instead
302 ;;
303 and r10 = r10,r14 // Apply mask
304 ;;
305 setf.sig f8 = r10
306 nop.i 123
307 ;;
308 // fault check takes 5 cycles and we have spare time
309 EX(.fail_efault, probe.w.fault r31, 3)
310 xmpy.l f8 = f8,f7 // nsec_per_cyc*(counter-last_counter)
311 ;;
312 getf.sig r2 = f8
313 mf
314 ;;
315 ld4 r10 = [r20] // gtod_lock.sequence
316 shr.u r2 = r2,r23 // shift by factor
317 ;;
318 add r8 = r8,r2 // Add xtime.nsecs
319 cmp4.ne p7,p0 = r28,r10
320 (p7) br.cond.dpnt.few .time_redo // sequence number changed, redo
321 // End critical section.
322 // Now r8=tv->tv_nsec and r9=tv->tv_sec
323 mov r10 = r0
324 movl r2 = 1000000000
325 add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31
326 (p14) movl r3 = 2361183241434822607 // Prep for / 1000 hack
327 ;;
328 .time_normalize:
329 mov r21 = r8
330 cmp.ge p6,p0 = r8,r2
331 (p14) shr.u r20 = r8, 3 // We can repeat this if necessary just wasting time
332 ;;
333 (p14) setf.sig f8 = r20
334 (p6) sub r8 = r8,r2
335 (p6) add r9 = 1,r9 // two nops before the branch.
336 (p14) setf.sig f7 = r3 // Chances for repeats are 1 in 10000 for gettod
337 (p6) br.cond.dpnt.few .time_normalize
338 ;;
339 // Divided by 8 though shift. Now divide by 125
340 // The compiler was able to do that with a multiply
341 // and a shift and we do the same
342 EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles
343 (p14) xmpy.hu f8 = f8, f7 // xmpy has 5 cycles latency so use it
344 ;;
345 (p14) getf.sig r2 = f8
346 ;;
347 mov r8 = r0
348 (p14) shr.u r21 = r2, 4
349 ;;
350 EX(.fail_efault, st8 [r31] = r9)
351 EX(.fail_efault, st8 [r23] = r21)
352 FSYS_RETURN
353 .fail_einval:
354 mov r8 = EINVAL
355 mov r10 = -1
356 FSYS_RETURN
357 .fail_efault:
358 mov r8 = EFAULT
359 mov r10 = -1
360 FSYS_RETURN
361 END(fsys_gettimeofday)
363 ENTRY(fsys_clock_gettime)
364 .prologue
365 .altrp b6
366 .body
367 cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32
368 // Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC
369 (p6) br.spnt.few fsys_fallback_syscall
370 mov r31 = r33
371 shl r30 = r32,15
372 br.many .gettime
373 END(fsys_clock_gettime)
375 /*
376 * long fsys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset, size_t sigsetsize).
377 */
378 #if _NSIG_WORDS != 1
379 # error Sorry, fsys_rt_sigprocmask() needs to be updated for _NSIG_WORDS != 1.
380 #endif
381 ENTRY(fsys_rt_sigprocmask)
382 .prologue
383 .altrp b6
384 .body
386 add r2=IA64_TASK_BLOCKED_OFFSET,r16
387 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
388 cmp4.ltu p6,p0=SIG_SETMASK,r32
390 cmp.ne p15,p0=r0,r34 // oset != NULL?
391 tnat.nz p8,p0=r34
392 add r31=IA64_TASK_SIGHAND_OFFSET,r16
393 ;;
394 ld8 r3=[r2] // read/prefetch current->blocked
395 ld4 r9=[r9]
396 tnat.nz.or p6,p0=r35
398 cmp.ne.or p6,p0=_NSIG_WORDS*8,r35
399 tnat.nz.or p6,p0=r32
400 (p6) br.spnt.few .fail_einval // fail with EINVAL
401 ;;
402 #ifdef CONFIG_SMP
403 ld8 r31=[r31] // r31 <- current->sighand
404 #endif
405 and r9=TIF_ALLWORK_MASK,r9
406 tnat.nz.or p8,p0=r33
407 ;;
408 cmp.ne p7,p0=0,r9
409 cmp.eq p6,p0=r0,r33 // set == NULL?
410 add r31=IA64_SIGHAND_SIGLOCK_OFFSET,r31 // r31 <- current->sighand->siglock
411 (p8) br.spnt.few .fail_efault // fail with EFAULT
412 (p7) br.spnt.many fsys_fallback_syscall // got pending kernel work...
413 (p6) br.dpnt.many .store_mask // -> short-circuit to just reading the signal mask
415 /* Argh, we actually have to do some work and _update_ the signal mask: */
417 EX(.fail_efault, probe.r.fault r33, 3) // verify user has read-access to *set
418 EX(.fail_efault, ld8 r14=[r33]) // r14 <- *set
419 mov r17=(1 << (SIGKILL - 1)) | (1 << (SIGSTOP - 1))
420 ;;
422 RSM_PSR_I(p0, r18, r19) // mask interrupt delivery
423 mov ar.ccv=0
424 andcm r14=r14,r17 // filter out SIGKILL & SIGSTOP
426 #ifdef CONFIG_SMP
427 mov r17=1
428 ;;
429 cmpxchg4.acq r18=[r31],r17,ar.ccv // try to acquire the lock
430 mov r8=EINVAL // default to EINVAL
431 ;;
432 ld8 r3=[r2] // re-read current->blocked now that we hold the lock
433 cmp4.ne p6,p0=r18,r0
434 (p6) br.cond.spnt.many .lock_contention
435 ;;
436 #else
437 ld8 r3=[r2] // re-read current->blocked now that we hold the lock
438 mov r8=EINVAL // default to EINVAL
439 #endif
440 add r18=IA64_TASK_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r16
441 add r19=IA64_TASK_SIGNAL_OFFSET,r16
442 cmp4.eq p6,p0=SIG_BLOCK,r32
443 ;;
444 ld8 r19=[r19] // r19 <- current->signal
445 cmp4.eq p7,p0=SIG_UNBLOCK,r32
446 cmp4.eq p8,p0=SIG_SETMASK,r32
447 ;;
448 ld8 r18=[r18] // r18 <- current->pending.signal
449 .pred.rel.mutex p6,p7,p8
450 (p6) or r14=r3,r14 // SIG_BLOCK
451 (p7) andcm r14=r3,r14 // SIG_UNBLOCK
453 (p8) mov r14=r14 // SIG_SETMASK
454 (p6) mov r8=0 // clear error code
455 // recalc_sigpending()
456 add r17=IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,r19
458 add r19=IA64_SIGNAL_SHARED_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r19
459 ;;
460 ld4 r17=[r17] // r17 <- current->signal->group_stop_count
461 (p7) mov r8=0 // clear error code
463 ld8 r19=[r19] // r19 <- current->signal->shared_pending
464 ;;
465 cmp4.gt p6,p7=r17,r0 // p6/p7 <- (current->signal->group_stop_count > 0)?
466 (p8) mov r8=0 // clear error code
468 or r18=r18,r19 // r18 <- current->pending | current->signal->shared_pending
469 ;;
470 // r18 <- (current->pending | current->signal->shared_pending) & ~current->blocked:
471 andcm r18=r18,r14
472 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
473 ;;
475 (p7) cmp.ne.or.andcm p6,p7=r18,r0 // p6/p7 <- signal pending
476 mov r19=0 // i must not leak kernel bits...
477 (p6) br.cond.dpnt.many .sig_pending
478 ;;
480 1: ld4 r17=[r9] // r17 <- current->thread_info->flags
481 ;;
482 mov ar.ccv=r17
483 and r18=~_TIF_SIGPENDING,r17 // r18 <- r17 & ~(1 << TIF_SIGPENDING)
484 ;;
486 st8 [r2]=r14 // update current->blocked with new mask
487 cmpxchg4.acq r8=[r9],r18,ar.ccv // current->thread_info->flags <- r18
488 ;;
489 cmp.ne p6,p0=r17,r8 // update failed?
490 (p6) br.cond.spnt.few 1b // yes -> retry
492 #ifdef CONFIG_SMP
493 st4.rel [r31]=r0 // release the lock
494 #endif
495 SSM_PSR_I(p0, p9, r31)
496 ;;
498 srlz.d // ensure psr.i is set again
499 mov r18=0 // i must not leak kernel bits...
501 .store_mask:
502 EX(.fail_efault, (p15) probe.w.fault r34, 3) // verify user has write-access to *oset
503 EX(.fail_efault, (p15) st8 [r34]=r3)
504 mov r2=0 // i must not leak kernel bits...
505 mov r3=0 // i must not leak kernel bits...
506 mov r8=0 // return 0
507 mov r9=0 // i must not leak kernel bits...
508 mov r14=0 // i must not leak kernel bits...
509 mov r17=0 // i must not leak kernel bits...
510 mov r31=0 // i must not leak kernel bits...
511 FSYS_RETURN
513 .sig_pending:
514 #ifdef CONFIG_SMP
515 st4.rel [r31]=r0 // release the lock
516 #endif
517 SSM_PSR_I(p0, p9, r17)
518 ;;
519 srlz.d
520 br.sptk.many fsys_fallback_syscall // with signal pending, do the heavy-weight syscall
522 #ifdef CONFIG_SMP
523 .lock_contention:
524 /* Rather than spinning here, fall back on doing a heavy-weight syscall. */
525 SSM_PSR_I(p0, p9, r17)
526 ;;
527 srlz.d
528 br.sptk.many fsys_fallback_syscall
529 #endif
530 END(fsys_rt_sigprocmask)
532 /*
533 * fsys_getcpu doesn't use the third parameter in this implementation. It reads
534 * current_thread_info()->cpu and corresponding node in cpu_to_node_map.
535 */
536 ENTRY(fsys_getcpu)
537 .prologue
538 .altrp b6
539 .body
540 ;;
541 add r2=TI_FLAGS+IA64_TASK_SIZE,r16
542 tnat.nz p6,p0 = r32 // guard against NaT argument
543 add r3=TI_CPU+IA64_TASK_SIZE,r16
544 ;;
545 ld4 r3=[r3] // M r3 = thread_info->cpu
546 ld4 r2=[r2] // M r2 = thread_info->flags
547 (p6) br.cond.spnt.few .fail_einval // B
548 ;;
549 tnat.nz p7,p0 = r33 // I guard against NaT argument
550 (p7) br.cond.spnt.few .fail_einval // B
551 #ifdef CONFIG_NUMA
552 movl r17=cpu_to_node_map
553 ;;
554 EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles
555 EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles
556 shladd r18=r3,1,r17
557 ;;
558 ld2 r20=[r18] // r20 = cpu_to_node_map[cpu]
559 and r2 = TIF_ALLWORK_MASK,r2
560 ;;
561 cmp.ne p8,p0=0,r2
562 (p8) br.spnt.many fsys_fallback_syscall
563 ;;
564 ;;
565 EX(.fail_efault, st4 [r32] = r3)
566 EX(.fail_efault, st2 [r33] = r20)
567 mov r8=0
568 ;;
569 #else
570 EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles
571 EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles
572 and r2 = TIF_ALLWORK_MASK,r2
573 ;;
574 cmp.ne p8,p0=0,r2
575 (p8) br.spnt.many fsys_fallback_syscall
576 ;;
577 EX(.fail_efault, st4 [r32] = r3)
578 EX(.fail_efault, st2 [r33] = r0)
579 mov r8=0
580 ;;
581 #endif
582 FSYS_RETURN
583 END(fsys_getcpu)
585 ENTRY(fsys_fallback_syscall)
586 .prologue
587 .altrp b6
588 .body
589 /*
590 * We only get here from light-weight syscall handlers. Thus, we already
591 * know that r15 contains a valid syscall number. No need to re-check.
592 */
593 adds r17=-1024,r15
594 movl r14=sys_call_table
595 ;;
596 RSM_PSR_I(p0, r26, r27)
597 shladd r18=r17,3,r14
598 ;;
599 ld8 r18=[r18] // load normal (heavy-weight) syscall entry-point
600 MOV_FROM_PSR(p0, r29, r26) // read psr (12 cyc load latency)
601 mov r27=ar.rsc
602 mov r21=ar.fpsr
603 mov r26=ar.pfs
604 END(fsys_fallback_syscall)
605 /* FALL THROUGH */
606 GLOBAL_ENTRY(paravirt_fsys_bubble_down)
607 .prologue
608 .altrp b6
609 .body
610 /*
611 * We get here for syscalls that don't have a lightweight
612 * handler. For those, we need to bubble down into the kernel
613 * and that requires setting up a minimal pt_regs structure,
614 * and initializing the CPU state more or less as if an
615 * interruption had occurred. To make syscall-restarts work,
616 * we setup pt_regs such that cr_iip points to the second
617 * instruction in syscall_via_break. Decrementing the IP
618 * hence will restart the syscall via break and not
619 * decrementing IP will return us to the caller, as usual.
620 * Note that we preserve the value of psr.pp rather than
621 * initializing it from dcr.pp. This makes it possible to
622 * distinguish fsyscall execution from other privileged
623 * execution.
624 *
625 * On entry:
626 * - normal fsyscall handler register usage, except
627 * that we also have:
628 * - r18: address of syscall entry point
629 * - r21: ar.fpsr
630 * - r26: ar.pfs
631 * - r27: ar.rsc
632 * - r29: psr
633 *
634 * We used to clear some PSR bits here but that requires slow
635 * serialization. Fortuntely, that isn't really necessary.
636 * The rationale is as follows: we used to clear bits
637 * ~PSR_PRESERVED_BITS in PSR.L. Since
638 * PSR_PRESERVED_BITS==PSR.{UP,MFL,MFH,PK,DT,PP,SP,RT,IC}, we
639 * ended up clearing PSR.{BE,AC,I,DFL,DFH,DI,DB,SI,TB}.
640 * However,
641 *
642 * PSR.BE : already is turned off in __kernel_syscall_via_epc()
643 * PSR.AC : don't care (kernel normally turns PSR.AC on)
644 * PSR.I : already turned off by the time paravirt_fsys_bubble_down gets
645 * invoked
646 * PSR.DFL: always 0 (kernel never turns it on)
647 * PSR.DFH: don't care --- kernel never touches f32-f127 on its own
648 * initiative
649 * PSR.DI : always 0 (kernel never turns it on)
650 * PSR.SI : always 0 (kernel never turns it on)
651 * PSR.DB : don't care --- kernel never enables kernel-level
652 * breakpoints
653 * PSR.TB : must be 0 already; if it wasn't zero on entry to
654 * __kernel_syscall_via_epc, the branch to paravirt_fsys_bubble_down
655 * will trigger a taken branch; the taken-trap-handler then
656 * converts the syscall into a break-based system-call.
657 */
658 /*
659 * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc.
660 * The rest we have to synthesize.
661 */
662 # define PSR_ONE_BITS ((3 << IA64_PSR_CPL0_BIT) \
663 | (0x1 << IA64_PSR_RI_BIT) \
664 | IA64_PSR_BN | IA64_PSR_I)
666 invala // M0|1
667 movl r14=ia64_ret_from_syscall // X
669 nop.m 0
670 movl r28=__kernel_syscall_via_break // X create cr.iip
671 ;;
673 mov r2=r16 // A get task addr to addl-addressable register
674 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // A
675 mov r31=pr // I0 save pr (2 cyc)
676 ;;
677 st1 [r16]=r0 // M2|3 clear current->thread.on_ustack flag
678 addl r22=IA64_RBS_OFFSET,r2 // A compute base of RBS
679 add r3=TI_FLAGS+IA64_TASK_SIZE,r2 // A
680 ;;
681 ld4 r3=[r3] // M0|1 r3 = current_thread_info()->flags
682 lfetch.fault.excl.nt1 [r22] // M0|1 prefetch register backing-store
683 nop.i 0
684 ;;
685 mov ar.rsc=0 // M2 set enforced lazy mode, pl 0, LE, loadrs=0
686 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
687 MOV_FROM_ITC(p0, p6, r30, r23) // M get cycle for accounting
688 #else
689 nop.m 0
690 #endif
691 nop.i 0
692 ;;
693 mov r23=ar.bspstore // M2 (12 cyc) save ar.bspstore
694 mov.m r24=ar.rnat // M2 (5 cyc) read ar.rnat (dual-issues!)
695 nop.i 0
696 ;;
697 mov ar.bspstore=r22 // M2 (6 cyc) switch to kernel RBS
698 movl r8=PSR_ONE_BITS // X
699 ;;
700 mov r25=ar.unat // M2 (5 cyc) save ar.unat
701 mov r19=b6 // I0 save b6 (2 cyc)
702 mov r20=r1 // A save caller's gp in r20
703 ;;
704 or r29=r8,r29 // A construct cr.ipsr value to save
705 mov b6=r18 // I0 copy syscall entry-point to b6 (7 cyc)
706 addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // A compute base of memory stack
708 mov r18=ar.bsp // M2 save (kernel) ar.bsp (12 cyc)
709 cmp.ne pKStk,pUStk=r0,r0 // A set pKStk <- 0, pUStk <- 1
710 br.call.sptk.many b7=ia64_syscall_setup // B
711 ;;
712 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
713 // mov.m r30=ar.itc is called in advance
714 add r16=TI_AC_STAMP+IA64_TASK_SIZE,r2
715 add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r2
716 ;;
717 ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel
718 ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at leave kernel
719 ;;
720 ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime
721 ld8 r21=[r17] // cumulated utime
722 sub r22=r19,r18 // stime before leave kernel
723 ;;
724 st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP // update stamp
725 sub r18=r30,r19 // elapsed time in user mode
726 ;;
727 add r20=r20,r22 // sum stime
728 add r21=r21,r18 // sum utime
729 ;;
730 st8 [r16]=r20 // update stime
731 st8 [r17]=r21 // update utime
732 ;;
733 #endif
734 mov ar.rsc=0x3 // M2 set eager mode, pl 0, LE, loadrs=0
735 mov rp=r14 // I0 set the real return addr
736 and r3=_TIF_SYSCALL_TRACEAUDIT,r3 // A
737 ;;
738 SSM_PSR_I(p0, p6, r22) // M2 we're on kernel stacks now, reenable irqs
739 cmp.eq p8,p0=r3,r0 // A
740 (p10) br.cond.spnt.many ia64_ret_from_syscall // B return if bad call-frame or r15 is a NaT
742 nop.m 0
743 (p8) br.call.sptk.many b6=b6 // B (ignore return address)
744 br.cond.spnt ia64_trace_syscall // B
745 END(paravirt_fsys_bubble_down)
747 .rodata
748 .align 8
749 .globl paravirt_fsyscall_table
751 data8 paravirt_fsys_bubble_down
752 paravirt_fsyscall_table:
753 data8 fsys_ni_syscall
754 data8 0 // exit // 1025
755 data8 0 // read
756 data8 0 // write
757 data8 0 // open
758 data8 0 // close
759 data8 0 // creat // 1030
760 data8 0 // link
761 data8 0 // unlink
762 data8 0 // execve
763 data8 0 // chdir
764 data8 0 // fchdir // 1035
765 data8 0 // utimes
766 data8 0 // mknod
767 data8 0 // chmod
768 data8 0 // chown
769 data8 0 // lseek // 1040
770 data8 fsys_getpid // getpid
771 data8 fsys_getppid // getppid
772 data8 0 // mount
773 data8 0 // umount
774 data8 0 // setuid // 1045
775 data8 0 // getuid
776 data8 0 // geteuid
777 data8 0 // ptrace
778 data8 0 // access
779 data8 0 // sync // 1050
780 data8 0 // fsync
781 data8 0 // fdatasync
782 data8 0 // kill
783 data8 0 // rename
784 data8 0 // mkdir // 1055
785 data8 0 // rmdir
786 data8 0 // dup
787 data8 0 // pipe
788 data8 0 // times
789 data8 0 // brk // 1060
790 data8 0 // setgid
791 data8 0 // getgid
792 data8 0 // getegid
793 data8 0 // acct
794 data8 0 // ioctl // 1065
795 data8 0 // fcntl
796 data8 0 // umask
797 data8 0 // chroot
798 data8 0 // ustat
799 data8 0 // dup2 // 1070
800 data8 0 // setreuid
801 data8 0 // setregid
802 data8 0 // getresuid
803 data8 0 // setresuid
804 data8 0 // getresgid // 1075
805 data8 0 // setresgid
806 data8 0 // getgroups
807 data8 0 // setgroups
808 data8 0 // getpgid
809 data8 0 // setpgid // 1080
810 data8 0 // setsid
811 data8 0 // getsid
812 data8 0 // sethostname
813 data8 0 // setrlimit
814 data8 0 // getrlimit // 1085
815 data8 0 // getrusage
816 data8 fsys_gettimeofday // gettimeofday
817 data8 0 // settimeofday
818 data8 0 // select
819 data8 0 // poll // 1090
820 data8 0 // symlink
821 data8 0 // readlink
822 data8 0 // uselib
823 data8 0 // swapon
824 data8 0 // swapoff // 1095
825 data8 0 // reboot
826 data8 0 // truncate
827 data8 0 // ftruncate
828 data8 0 // fchmod
829 data8 0 // fchown // 1100
830 data8 0 // getpriority
831 data8 0 // setpriority
832 data8 0 // statfs
833 data8 0 // fstatfs
834 data8 0 // gettid // 1105
835 data8 0 // semget
836 data8 0 // semop
837 data8 0 // semctl
838 data8 0 // msgget
839 data8 0 // msgsnd // 1110
840 data8 0 // msgrcv
841 data8 0 // msgctl
842 data8 0 // shmget
843 data8 0 // shmat
844 data8 0 // shmdt // 1115
845 data8 0 // shmctl
846 data8 0 // syslog
847 data8 0 // setitimer
848 data8 0 // getitimer
849 data8 0 // 1120
850 data8 0
851 data8 0
852 data8 0 // vhangup
853 data8 0 // lchown
854 data8 0 // remap_file_pages // 1125
855 data8 0 // wait4
856 data8 0 // sysinfo
857 data8 0 // clone
858 data8 0 // setdomainname
859 data8 0 // newuname // 1130
860 data8 0 // adjtimex
861 data8 0
862 data8 0 // init_module
863 data8 0 // delete_module
864 data8 0 // 1135
865 data8 0
866 data8 0 // quotactl
867 data8 0 // bdflush
868 data8 0 // sysfs
869 data8 0 // personality // 1140
870 data8 0 // afs_syscall
871 data8 0 // setfsuid
872 data8 0 // setfsgid
873 data8 0 // getdents
874 data8 0 // flock // 1145
875 data8 0 // readv
876 data8 0 // writev
877 data8 0 // pread64
878 data8 0 // pwrite64
879 data8 0 // sysctl // 1150
880 data8 0 // mmap
881 data8 0 // munmap
882 data8 0 // mlock
883 data8 0 // mlockall
884 data8 0 // mprotect // 1155
885 data8 0 // mremap
886 data8 0 // msync
887 data8 0 // munlock
888 data8 0 // munlockall
889 data8 0 // sched_getparam // 1160
890 data8 0 // sched_setparam
891 data8 0 // sched_getscheduler
892 data8 0 // sched_setscheduler
893 data8 0 // sched_yield
894 data8 0 // sched_get_priority_max // 1165
895 data8 0 // sched_get_priority_min
896 data8 0 // sched_rr_get_interval
897 data8 0 // nanosleep
898 data8 0 // nfsservctl
899 data8 0 // prctl // 1170
900 data8 0 // getpagesize
901 data8 0 // mmap2
902 data8 0 // pciconfig_read
903 data8 0 // pciconfig_write
904 data8 0 // perfmonctl // 1175
905 data8 0 // sigaltstack
906 data8 0 // rt_sigaction
907 data8 0 // rt_sigpending
908 data8 fsys_rt_sigprocmask // rt_sigprocmask
909 data8 0 // rt_sigqueueinfo // 1180
910 data8 0 // rt_sigreturn
911 data8 0 // rt_sigsuspend
912 data8 0 // rt_sigtimedwait
913 data8 0 // getcwd
914 data8 0 // capget // 1185
915 data8 0 // capset
916 data8 0 // sendfile
917 data8 0
918 data8 0
919 data8 0 // socket // 1190
920 data8 0 // bind
921 data8 0 // connect
922 data8 0 // listen
923 data8 0 // accept
924 data8 0 // getsockname // 1195
925 data8 0 // getpeername
926 data8 0 // socketpair
927 data8 0 // send
928 data8 0 // sendto
929 data8 0 // recv // 1200
930 data8 0 // recvfrom
931 data8 0 // shutdown
932 data8 0 // setsockopt
933 data8 0 // getsockopt
934 data8 0 // sendmsg // 1205
935 data8 0 // recvmsg
936 data8 0 // pivot_root
937 data8 0 // mincore
938 data8 0 // madvise
939 data8 0 // newstat // 1210
940 data8 0 // newlstat
941 data8 0 // newfstat
942 data8 0 // clone2
943 data8 0 // getdents64
944 data8 0 // getunwind // 1215
945 data8 0 // readahead
946 data8 0 // setxattr
947 data8 0 // lsetxattr
948 data8 0 // fsetxattr
949 data8 0 // getxattr // 1220
950 data8 0 // lgetxattr
951 data8 0 // fgetxattr
952 data8 0 // listxattr
953 data8 0 // llistxattr
954 data8 0 // flistxattr // 1225
955 data8 0 // removexattr
956 data8 0 // lremovexattr
957 data8 0 // fremovexattr
958 data8 0 // tkill
959 data8 0 // futex // 1230
960 data8 0 // sched_setaffinity
961 data8 0 // sched_getaffinity
962 data8 fsys_set_tid_address // set_tid_address
963 data8 0 // fadvise64_64
964 data8 0 // tgkill // 1235
965 data8 0 // exit_group
966 data8 0 // lookup_dcookie
967 data8 0 // io_setup
968 data8 0 // io_destroy
969 data8 0 // io_getevents // 1240
970 data8 0 // io_submit
971 data8 0 // io_cancel
972 data8 0 // epoll_create
973 data8 0 // epoll_ctl
974 data8 0 // epoll_wait // 1245
975 data8 0 // restart_syscall
976 data8 0 // semtimedop
977 data8 0 // timer_create
978 data8 0 // timer_settime
979 data8 0 // timer_gettime // 1250
980 data8 0 // timer_getoverrun
981 data8 0 // timer_delete
982 data8 0 // clock_settime
983 data8 fsys_clock_gettime // clock_gettime
984 data8 0 // clock_getres // 1255
985 data8 0 // clock_nanosleep
986 data8 0 // fstatfs64
987 data8 0 // statfs64
988 data8 0 // mbind
989 data8 0 // get_mempolicy // 1260
990 data8 0 // set_mempolicy
991 data8 0 // mq_open
992 data8 0 // mq_unlink
993 data8 0 // mq_timedsend
994 data8 0 // mq_timedreceive // 1265
995 data8 0 // mq_notify
996 data8 0 // mq_getsetattr
997 data8 0 // kexec_load
998 data8 0 // vserver
999 data8 0 // waitid // 1270
1000 data8 0 // add_key
1001 data8 0 // request_key
1002 data8 0 // keyctl
1003 data8 0 // ioprio_set
1004 data8 0 // ioprio_get // 1275
1005 data8 0 // move_pages
1006 data8 0 // inotify_init
1007 data8 0 // inotify_add_watch
1008 data8 0 // inotify_rm_watch
1009 data8 0 // migrate_pages // 1280
1010 data8 0 // openat
1011 data8 0 // mkdirat
1012 data8 0 // mknodat
1013 data8 0 // fchownat
1014 data8 0 // futimesat // 1285
1015 data8 0 // newfstatat
1016 data8 0 // unlinkat
1017 data8 0 // renameat
1018 data8 0 // linkat
1019 data8 0 // symlinkat // 1290
1020 data8 0 // readlinkat
1021 data8 0 // fchmodat
1022 data8 0 // faccessat
1023 data8 0
1024 data8 0 // 1295
1025 data8 0 // unshare
1026 data8 0 // splice
1027 data8 0 // set_robust_list
1028 data8 0 // get_robust_list
1029 data8 0 // sync_file_range // 1300
1030 data8 0 // tee
1031 data8 0 // vmsplice
1032 data8 0
1033 data8 fsys_getcpu // getcpu // 1304
1035 // fill in zeros for the remaining entries
1036 .zero:
1037 .space paravirt_fsyscall_table + 8*NR_syscalls - .zero, 0