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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/kernel/fsys.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
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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 */
14
15#include <asm/asmmacro.h>
16#include <asm/errno.h>
17#include <asm/offsets.h>
18#include <asm/percpu.h>
19#include <asm/thread_info.h>
20#include <asm/sal.h>
21#include <asm/signal.h>
22#include <asm/system.h>
23#include <asm/unistd.h>
24
25#include "entry.h"
26
27/*
28 * See Documentation/ia64/fsys.txt for details on fsyscalls.
29 *
30 * On entry to an fsyscall handler:
31 * r10 = 0 (i.e., defaults to "successful syscall return")
32 * r11 = saved ar.pfs (a user-level value)
33 * r15 = system call number
34 * r16 = "current" task pointer (in normal kernel-mode, this is in r13)
35 * r32-r39 = system call arguments
36 * b6 = return address (a user-level value)
37 * ar.pfs = previous frame-state (a user-level value)
38 * PSR.be = cleared to zero (i.e., little-endian byte order is in effect)
39 * all other registers may contain values passed in from user-mode
40 *
41 * On return from an fsyscall handler:
42 * r11 = saved ar.pfs (as passed into the fsyscall handler)
43 * r15 = system call number (as passed into the fsyscall handler)
44 * r32-r39 = system call arguments (as passed into the fsyscall handler)
45 * b6 = return address (as passed into the fsyscall handler)
46 * ar.pfs = previous frame-state (as passed into the fsyscall handler)
47 */
48
49ENTRY(fsys_ni_syscall)
50 .prologue
51 .altrp b6
52 .body
53 mov r8=ENOSYS
54 mov r10=-1
55 FSYS_RETURN
56END(fsys_ni_syscall)
57
58ENTRY(fsys_getpid)
59 .prologue
60 .altrp b6
61 .body
62 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
63 ;;
64 ld4 r9=[r9]
65 add r8=IA64_TASK_TGID_OFFSET,r16
66 ;;
67 and r9=TIF_ALLWORK_MASK,r9
68 ld4 r8=[r8] // r8 = current->tgid
69 ;;
70 cmp.ne p8,p0=0,r9
71(p8) br.spnt.many fsys_fallback_syscall
72 FSYS_RETURN
73END(fsys_getpid)
74
75ENTRY(fsys_getppid)
76 .prologue
77 .altrp b6
78 .body
79 add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16
80 ;;
81 ld8 r17=[r17] // r17 = current->group_leader
82 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
83 ;;
84
85 ld4 r9=[r9]
86 add r17=IA64_TASK_REAL_PARENT_OFFSET,r17 // r17 = &current->group_leader->real_parent
87 ;;
88 and r9=TIF_ALLWORK_MASK,r9
89
901: ld8 r18=[r17] // r18 = current->group_leader->real_parent
91 ;;
92 cmp.ne p8,p0=0,r9
93 add r8=IA64_TASK_TGID_OFFSET,r18 // r8 = &current->group_leader->real_parent->tgid
94 ;;
95
96 /*
97 * The .acq is needed to ensure that the read of tgid has returned its data before
98 * we re-check "real_parent".
99 */
100 ld4.acq r8=[r8] // r8 = current->group_leader->real_parent->tgid
101#ifdef CONFIG_SMP
102 /*
103 * Re-read current->group_leader->real_parent.
104 */
105 ld8 r19=[r17] // r19 = current->group_leader->real_parent
106(p8) br.spnt.many fsys_fallback_syscall
107 ;;
108 cmp.ne p6,p0=r18,r19 // did real_parent change?
109 mov r19=0 // i must not leak kernel bits...
110(p6) br.cond.spnt.few 1b // yes -> redo the read of tgid and the check
111 ;;
112 mov r17=0 // i must not leak kernel bits...
113 mov r18=0 // i must not leak kernel bits...
114#else
115 mov r17=0 // i must not leak kernel bits...
116 mov r18=0 // i must not leak kernel bits...
117 mov r19=0 // i must not leak kernel bits...
118#endif
119 FSYS_RETURN
120END(fsys_getppid)
121
122ENTRY(fsys_set_tid_address)
123 .prologue
124 .altrp b6
125 .body
126 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
127 ;;
128 ld4 r9=[r9]
129 tnat.z p6,p7=r32 // check argument register for being NaT
130 ;;
131 and r9=TIF_ALLWORK_MASK,r9
132 add r8=IA64_TASK_PID_OFFSET,r16
133 add r18=IA64_TASK_CLEAR_CHILD_TID_OFFSET,r16
134 ;;
135 ld4 r8=[r8]
136 cmp.ne p8,p0=0,r9
137 mov r17=-1
138 ;;
139(p6) st8 [r18]=r32
140(p7) st8 [r18]=r17
141(p8) br.spnt.many fsys_fallback_syscall
142 ;;
143 mov r17=0 // i must not leak kernel bits...
144 mov r18=0 // i must not leak kernel bits...
145 FSYS_RETURN
146END(fsys_set_tid_address)
147
148/*
149 * Ensure that the time interpolator structure is compatible with the asm code
150 */
151#if IA64_TIME_INTERPOLATOR_SOURCE_OFFSET !=0 || IA64_TIME_INTERPOLATOR_SHIFT_OFFSET != 2 \
152 || IA64_TIME_INTERPOLATOR_JITTER_OFFSET != 3 || IA64_TIME_INTERPOLATOR_NSEC_OFFSET != 4
153#error fsys_gettimeofday incompatible with changes to struct time_interpolator
154#endif
155#define CLOCK_REALTIME 0
156#define CLOCK_MONOTONIC 1
157#define CLOCK_DIVIDE_BY_1000 0x4000
158#define CLOCK_ADD_MONOTONIC 0x8000
159
160ENTRY(fsys_gettimeofday)
161 .prologue
162 .altrp b6
163 .body
164 mov r31 = r32
165 tnat.nz p6,p0 = r33 // guard against NaT argument
166(p6) br.cond.spnt.few .fail_einval
167 mov r30 = CLOCK_DIVIDE_BY_1000
168 ;;
169.gettime:
170 // Register map
171 // Incoming r31 = pointer to address where to place result
172 // r30 = flags determining how time is processed
173 // r2,r3 = temp r4-r7 preserved
174 // r8 = result nanoseconds
175 // r9 = result seconds
176 // r10 = temporary storage for clock difference
177 // r11 = preserved: saved ar.pfs
178 // r12 = preserved: memory stack
179 // r13 = preserved: thread pointer
180 // r14 = address of mask / mask
181 // r15 = preserved: system call number
182 // r16 = preserved: current task pointer
183 // r17 = wall to monotonic use
184 // r18 = time_interpolator->offset
185 // r19 = address of wall_to_monotonic
186 // r20 = pointer to struct time_interpolator / pointer to time_interpolator->address
187 // r21 = shift factor
188 // r22 = address of time interpolator->last_counter
189 // r23 = address of time_interpolator->last_cycle
190 // r24 = adress of time_interpolator->offset
191 // r25 = last_cycle value
192 // r26 = last_counter value
193 // r27 = pointer to xtime
194 // r28 = sequence number at the beginning of critcal section
195 // r29 = address of seqlock
196 // r30 = time processing flags / memory address
197 // r31 = pointer to result
198 // Predicates
199 // p6,p7 short term use
200 // p8 = timesource ar.itc
201 // p9 = timesource mmio64
202 // p10 = timesource mmio32
203 // p11 = timesource not to be handled by asm code
204 // p12 = memory time source ( = p9 | p10)
205 // p13 = do cmpxchg with time_interpolator_last_cycle
206 // p14 = Divide by 1000
207 // p15 = Add monotonic
208 //
209 // Note that instructions are optimized for McKinley. McKinley can process two
210 // bundles simultaneously and therefore we continuously try to feed the CPU
211 // two bundles and then a stop.
212 tnat.nz p6,p0 = r31 // branch deferred since it does not fit into bundle structure
213 mov pr = r30,0xc000 // Set predicates according to function
214 add r2 = TI_FLAGS+IA64_TASK_SIZE,r16
215 movl r20 = time_interpolator
216 ;;
217 ld8 r20 = [r20] // get pointer to time_interpolator structure
218 movl r29 = xtime_lock
219 ld4 r2 = [r2] // process work pending flags
220 movl r27 = xtime
221 ;; // only one bundle here
222 ld8 r21 = [r20] // first quad with control information
223 and r2 = TIF_ALLWORK_MASK,r2
224(p6) br.cond.spnt.few .fail_einval // deferred branch
225 ;;
226 add r10 = IA64_TIME_INTERPOLATOR_ADDRESS_OFFSET,r20
227 extr r3 = r21,32,32 // time_interpolator->nsec_per_cyc
228 extr r8 = r21,0,16 // time_interpolator->source
229 cmp.ne p6, p0 = 0, r2 // Fallback if work is scheduled
230(p6) br.cond.spnt.many fsys_fallback_syscall
231 ;;
232 cmp.eq p8,p12 = 0,r8 // Check for cpu timer
233 cmp.eq p9,p0 = 1,r8 // MMIO64 ?
234 extr r2 = r21,24,8 // time_interpolator->jitter
235 cmp.eq p10,p0 = 2,r8 // MMIO32 ?
236 cmp.ltu p11,p0 = 2,r8 // function or other clock
237(p11) br.cond.spnt.many fsys_fallback_syscall
238 ;;
239 setf.sig f7 = r3 // Setup for scaling of counter
240(p15) movl r19 = wall_to_monotonic
241(p12) ld8 r30 = [r10]
242 cmp.ne p13,p0 = r2,r0 // need jitter compensation?
243 extr r21 = r21,16,8 // shift factor
244 ;;
245.time_redo:
246 .pred.rel.mutex p8,p9,p10
247 ld4.acq r28 = [r29] // xtime_lock.sequence. Must come first for locking purposes
248(p8) mov r2 = ar.itc // CPU_TIMER. 36 clocks latency!!!
249 add r22 = IA64_TIME_INTERPOLATOR_LAST_COUNTER_OFFSET,r20
250(p9) ld8 r2 = [r30] // readq(ti->address). Could also have latency issues..
251(p10) ld4 r2 = [r30] // readw(ti->address)
252(p13) add r23 = IA64_TIME_INTERPOLATOR_LAST_CYCLE_OFFSET,r20
253 ;; // could be removed by moving the last add upward
254 ld8 r26 = [r22] // time_interpolator->last_counter
255(p13) ld8 r25 = [r23] // time interpolator->last_cycle
256 add r24 = IA64_TIME_INTERPOLATOR_OFFSET_OFFSET,r20
257(p15) ld8 r17 = [r19],IA64_TIMESPEC_TV_NSEC_OFFSET
258 ld8 r9 = [r27],IA64_TIMESPEC_TV_NSEC_OFFSET
259 add r14 = IA64_TIME_INTERPOLATOR_MASK_OFFSET, r20
260 ;;
261 ld8 r18 = [r24] // time_interpolator->offset
262 ld8 r8 = [r27],-IA64_TIMESPEC_TV_NSEC_OFFSET // xtime.tv_nsec
263(p13) sub r3 = r25,r2 // Diff needed before comparison (thanks davidm)
264 ;;
265 ld8 r14 = [r14] // time_interpolator->mask
266(p13) cmp.gt.unc p6,p7 = r3,r0 // check if it is less than last. p6,p7 cleared
267 sub r10 = r2,r26 // current_counter - last_counter
268 ;;
269(p6) sub r10 = r25,r26 // time we got was less than last_cycle
270(p7) mov ar.ccv = r25 // more than last_cycle. Prep for cmpxchg
271 ;;
272 and r10 = r10,r14 // Apply mask
273 ;;
274 setf.sig f8 = r10
275 nop.i 123
276 ;;
277(p7) cmpxchg8.rel r3 = [r23],r2,ar.ccv
278EX(.fail_efault, probe.w.fault r31, 3) // This takes 5 cycles and we have spare time
279 xmpy.l f8 = f8,f7 // nsec_per_cyc*(counter-last_counter)
280(p15) add r9 = r9,r17 // Add wall to monotonic.secs to result secs
281 ;;
282(p15) ld8 r17 = [r19],-IA64_TIMESPEC_TV_NSEC_OFFSET
283(p7) cmp.ne p7,p0 = r25,r3 // if cmpxchg not successful redo
284 // simulate tbit.nz.or p7,p0 = r28,0
285 and r28 = ~1,r28 // Make sequence even to force retry if odd
286 getf.sig r2 = f8
287 mf
288 add r8 = r8,r18 // Add time interpolator offset
289 ;;
290 ld4 r10 = [r29] // xtime_lock.sequence
291(p15) add r8 = r8, r17 // Add monotonic.nsecs to nsecs
292 shr.u r2 = r2,r21
293 ;; // overloaded 3 bundles!
294 // End critical section.
295 add r8 = r8,r2 // Add xtime.nsecs
296 cmp4.ne.or p7,p0 = r28,r10
297(p7) br.cond.dpnt.few .time_redo // sequence number changed ?
298 // Now r8=tv->tv_nsec and r9=tv->tv_sec
299 mov r10 = r0
300 movl r2 = 1000000000
301 add r23 = IA64_TIMESPEC_TV_NSEC_OFFSET, r31
302(p14) movl r3 = 2361183241434822607 // Prep for / 1000 hack
303 ;;
304.time_normalize:
305 mov r21 = r8
306 cmp.ge p6,p0 = r8,r2
307(p14) shr.u r20 = r8, 3 // We can repeat this if necessary just wasting some time
308 ;;
309(p14) setf.sig f8 = r20
310(p6) sub r8 = r8,r2
311(p6) add r9 = 1,r9 // two nops before the branch.
312(p14) setf.sig f7 = r3 // Chances for repeats are 1 in 10000 for gettod
313(p6) br.cond.dpnt.few .time_normalize
314 ;;
315 // Divided by 8 though shift. Now divide by 125
316 // The compiler was able to do that with a multiply
317 // and a shift and we do the same
318EX(.fail_efault, probe.w.fault r23, 3) // This also costs 5 cycles
319(p14) xmpy.hu f8 = f8, f7 // xmpy has 5 cycles latency so use it...
320 ;;
321 mov r8 = r0
322(p14) getf.sig r2 = f8
323 ;;
324(p14) shr.u r21 = r2, 4
325 ;;
326EX(.fail_efault, st8 [r31] = r9)
327EX(.fail_efault, st8 [r23] = r21)
328 FSYS_RETURN
329.fail_einval:
330 mov r8 = EINVAL
331 mov r10 = -1
332 FSYS_RETURN
333.fail_efault:
334 mov r8 = EFAULT
335 mov r10 = -1
336 FSYS_RETURN
337END(fsys_gettimeofday)
338
339ENTRY(fsys_clock_gettime)
340 .prologue
341 .altrp b6
342 .body
343 cmp4.ltu p6, p0 = CLOCK_MONOTONIC, r32
344 // Fallback if this is not CLOCK_REALTIME or CLOCK_MONOTONIC
345(p6) br.spnt.few fsys_fallback_syscall
346 mov r31 = r33
347 shl r30 = r32,15
348 br.many .gettime
349END(fsys_clock_gettime)
350
351/*
352 * long fsys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset, size_t sigsetsize).
353 */
354#if _NSIG_WORDS != 1
355# error Sorry, fsys_rt_sigprocmask() needs to be updated for _NSIG_WORDS != 1.
356#endif
357ENTRY(fsys_rt_sigprocmask)
358 .prologue
359 .altrp b6
360 .body
361
362 add r2=IA64_TASK_BLOCKED_OFFSET,r16
363 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
364 cmp4.ltu p6,p0=SIG_SETMASK,r32
365
366 cmp.ne p15,p0=r0,r34 // oset != NULL?
367 tnat.nz p8,p0=r34
368 add r31=IA64_TASK_SIGHAND_OFFSET,r16
369 ;;
370 ld8 r3=[r2] // read/prefetch current->blocked
371 ld4 r9=[r9]
372 tnat.nz.or p6,p0=r35
373
374 cmp.ne.or p6,p0=_NSIG_WORDS*8,r35
375 tnat.nz.or p6,p0=r32
376(p6) br.spnt.few .fail_einval // fail with EINVAL
377 ;;
378#ifdef CONFIG_SMP
379 ld8 r31=[r31] // r31 <- current->sighand
380#endif
381 and r9=TIF_ALLWORK_MASK,r9
382 tnat.nz.or p8,p0=r33
383 ;;
384 cmp.ne p7,p0=0,r9
385 cmp.eq p6,p0=r0,r33 // set == NULL?
386 add r31=IA64_SIGHAND_SIGLOCK_OFFSET,r31 // r31 <- current->sighand->siglock
387(p8) br.spnt.few .fail_efault // fail with EFAULT
388(p7) br.spnt.many fsys_fallback_syscall // got pending kernel work...
389(p6) br.dpnt.many .store_mask // -> short-circuit to just reading the signal mask
390
391 /* Argh, we actually have to do some work and _update_ the signal mask: */
392
393EX(.fail_efault, probe.r.fault r33, 3) // verify user has read-access to *set
394EX(.fail_efault, ld8 r14=[r33]) // r14 <- *set
395 mov r17=(1 << (SIGKILL - 1)) | (1 << (SIGSTOP - 1))
396 ;;
397
398 rsm psr.i // mask interrupt delivery
399 mov ar.ccv=0
400 andcm r14=r14,r17 // filter out SIGKILL & SIGSTOP
401
402#ifdef CONFIG_SMP
403 mov r17=1
404 ;;
405 cmpxchg4.acq r18=[r31],r17,ar.ccv // try to acquire the lock
406 mov r8=EINVAL // default to EINVAL
407 ;;
408 ld8 r3=[r2] // re-read current->blocked now that we hold the lock
409 cmp4.ne p6,p0=r18,r0
410(p6) br.cond.spnt.many .lock_contention
411 ;;
412#else
413 ld8 r3=[r2] // re-read current->blocked now that we hold the lock
414 mov r8=EINVAL // default to EINVAL
415#endif
416 add r18=IA64_TASK_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r16
417 add r19=IA64_TASK_SIGNAL_OFFSET,r16
418 cmp4.eq p6,p0=SIG_BLOCK,r32
419 ;;
420 ld8 r19=[r19] // r19 <- current->signal
421 cmp4.eq p7,p0=SIG_UNBLOCK,r32
422 cmp4.eq p8,p0=SIG_SETMASK,r32
423 ;;
424 ld8 r18=[r18] // r18 <- current->pending.signal
425 .pred.rel.mutex p6,p7,p8
426(p6) or r14=r3,r14 // SIG_BLOCK
427(p7) andcm r14=r3,r14 // SIG_UNBLOCK
428
429(p8) mov r14=r14 // SIG_SETMASK
430(p6) mov r8=0 // clear error code
431 // recalc_sigpending()
432 add r17=IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,r19
433
434 add r19=IA64_SIGNAL_SHARED_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r19
435 ;;
436 ld4 r17=[r17] // r17 <- current->signal->group_stop_count
437(p7) mov r8=0 // clear error code
438
439 ld8 r19=[r19] // r19 <- current->signal->shared_pending
440 ;;
441 cmp4.gt p6,p7=r17,r0 // p6/p7 <- (current->signal->group_stop_count > 0)?
442(p8) mov r8=0 // clear error code
443
444 or r18=r18,r19 // r18 <- current->pending | current->signal->shared_pending
445 ;;
446 // r18 <- (current->pending | current->signal->shared_pending) & ~current->blocked:
447 andcm r18=r18,r14
448 add r9=TI_FLAGS+IA64_TASK_SIZE,r16
449 ;;
450
451(p7) cmp.ne.or.andcm p6,p7=r18,r0 // p6/p7 <- signal pending
452 mov r19=0 // i must not leak kernel bits...
453(p6) br.cond.dpnt.many .sig_pending
454 ;;
455
4561: ld4 r17=[r9] // r17 <- current->thread_info->flags
457 ;;
458 mov ar.ccv=r17
459 and r18=~_TIF_SIGPENDING,r17 // r18 <- r17 & ~(1 << TIF_SIGPENDING)
460 ;;
461
462 st8 [r2]=r14 // update current->blocked with new mask
463 cmpxchg4.acq r14=[r9],r18,ar.ccv // current->thread_info->flags <- r18
464 ;;
465 cmp.ne p6,p0=r17,r14 // update failed?
466(p6) br.cond.spnt.few 1b // yes -> retry
467
468#ifdef CONFIG_SMP
469 st4.rel [r31]=r0 // release the lock
470#endif
471 ssm psr.i
472 ;;
473
474 srlz.d // ensure psr.i is set again
475 mov r18=0 // i must not leak kernel bits...
476
477.store_mask:
478EX(.fail_efault, (p15) probe.w.fault r34, 3) // verify user has write-access to *oset
479EX(.fail_efault, (p15) st8 [r34]=r3)
480 mov r2=0 // i must not leak kernel bits...
481 mov r3=0 // i must not leak kernel bits...
482 mov r8=0 // return 0
483 mov r9=0 // i must not leak kernel bits...
484 mov r14=0 // i must not leak kernel bits...
485 mov r17=0 // i must not leak kernel bits...
486 mov r31=0 // i must not leak kernel bits...
487 FSYS_RETURN
488
489.sig_pending:
490#ifdef CONFIG_SMP
491 st4.rel [r31]=r0 // release the lock
492#endif
493 ssm psr.i
494 ;;
495 srlz.d
496 br.sptk.many fsys_fallback_syscall // with signal pending, do the heavy-weight syscall
497
498#ifdef CONFIG_SMP
499.lock_contention:
500 /* Rather than spinning here, fall back on doing a heavy-weight syscall. */
501 ssm psr.i
502 ;;
503 srlz.d
504 br.sptk.many fsys_fallback_syscall
505#endif
506END(fsys_rt_sigprocmask)
507
508ENTRY(fsys_fallback_syscall)
509 .prologue
510 .altrp b6
511 .body
512 /*
513 * We only get here from light-weight syscall handlers. Thus, we already
514 * know that r15 contains a valid syscall number. No need to re-check.
515 */
516 adds r17=-1024,r15
517 movl r14=sys_call_table
518 ;;
519 rsm psr.i
520 shladd r18=r17,3,r14
521 ;;
522 ld8 r18=[r18] // load normal (heavy-weight) syscall entry-point
523 mov r29=psr // read psr (12 cyc load latency)
524 mov r27=ar.rsc
525 mov r21=ar.fpsr
526 mov r26=ar.pfs
527END(fsys_fallback_syscall)
528 /* FALL THROUGH */
529GLOBAL_ENTRY(fsys_bubble_down)
530 .prologue
531 .altrp b6
532 .body
533 /*
534 * We get here for syscalls that don't have a lightweight handler. For those, we
535 * need to bubble down into the kernel and that requires setting up a minimal
536 * pt_regs structure, and initializing the CPU state more or less as if an
537 * interruption had occurred. To make syscall-restarts work, we setup pt_regs
538 * such that cr_iip points to the second instruction in syscall_via_break.
539 * Decrementing the IP hence will restart the syscall via break and not
540 * decrementing IP will return us to the caller, as usual. Note that we preserve
541 * the value of psr.pp rather than initializing it from dcr.pp. This makes it
542 * possible to distinguish fsyscall execution from other privileged execution.
543 *
544 * On entry:
545 * - normal fsyscall handler register usage, except that we also have:
546 * - r18: address of syscall entry point
547 * - r21: ar.fpsr
548 * - r26: ar.pfs
549 * - r27: ar.rsc
550 * - r29: psr
551 */
552# define PSR_PRESERVED_BITS (IA64_PSR_UP | IA64_PSR_MFL | IA64_PSR_MFH | IA64_PSR_PK \
553 | IA64_PSR_DT | IA64_PSR_PP | IA64_PSR_SP | IA64_PSR_RT \
554 | IA64_PSR_IC)
555 /*
556 * Reading psr.l gives us only bits 0-31, psr.it, and psr.mc. The rest we have
557 * to synthesize.
558 */
559# define PSR_ONE_BITS ((3 << IA64_PSR_CPL0_BIT) | (0x1 << IA64_PSR_RI_BIT) \
560 | IA64_PSR_BN | IA64_PSR_I)
561
562 invala
563 movl r8=PSR_ONE_BITS
564
565 mov r25=ar.unat // save ar.unat (5 cyc)
566 movl r9=PSR_PRESERVED_BITS
567
568 mov ar.rsc=0 // set enforced lazy mode, pl 0, little-endian, loadrs=0
569 movl r28=__kernel_syscall_via_break
570 ;;
571 mov r23=ar.bspstore // save ar.bspstore (12 cyc)
572 mov r31=pr // save pr (2 cyc)
573 mov r20=r1 // save caller's gp in r20
574 ;;
575 mov r2=r16 // copy current task addr to addl-addressable register
576 and r9=r9,r29
577 mov r19=b6 // save b6 (2 cyc)
578 ;;
579 mov psr.l=r9 // slam the door (17 cyc to srlz.i)
580 or r29=r8,r29 // construct cr.ipsr value to save
581 addl r22=IA64_RBS_OFFSET,r2 // compute base of RBS
582 ;;
583 // GAS reports a spurious RAW hazard on the read of ar.rnat because it thinks
584 // we may be reading ar.itc after writing to psr.l. Avoid that message with
585 // this directive:
586 dv_serialize_data
587 mov.m r24=ar.rnat // read ar.rnat (5 cyc lat)
588 lfetch.fault.excl.nt1 [r22]
589 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r2
590
591 // ensure previous insn group is issued before we stall for srlz.i:
592 ;;
593 srlz.i // ensure new psr.l has been established
594 /////////////////////////////////////////////////////////////////////////////
595 ////////// from this point on, execution is not interruptible anymore
596 /////////////////////////////////////////////////////////////////////////////
597 addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 // compute base of memory stack
598 cmp.ne pKStk,pUStk=r0,r0 // set pKStk <- 0, pUStk <- 1
599 ;;
600 st1 [r16]=r0 // clear current->thread.on_ustack flag
601 mov ar.bspstore=r22 // switch to kernel RBS
602 mov b6=r18 // copy syscall entry-point to b6 (7 cyc)
603 add r3=TI_FLAGS+IA64_TASK_SIZE,r2
604 ;;
605 ld4 r3=[r3] // r2 = current_thread_info()->flags
606 mov r18=ar.bsp // save (kernel) ar.bsp (12 cyc)
607 mov ar.rsc=0x3 // set eager mode, pl 0, little-endian, loadrs=0
608 br.call.sptk.many b7=ia64_syscall_setup
609 ;;
610 ssm psr.i
611 movl r2=ia64_ret_from_syscall
612 ;;
613 mov rp=r2 // set the real return addr
614 tbit.z p8,p0=r3,TIF_SYSCALL_TRACE
615 ;;
616(p10) br.cond.spnt.many ia64_ret_from_syscall // p10==true means out registers are more than 8
617(p8) br.call.sptk.many b6=b6 // ignore this return addr
618 br.cond.sptk ia64_trace_syscall
619END(fsys_bubble_down)
620
621 .rodata
622 .align 8
623 .globl fsyscall_table
624
625 data8 fsys_bubble_down
626fsyscall_table:
627 data8 fsys_ni_syscall
628 data8 0 // exit // 1025
629 data8 0 // read
630 data8 0 // write
631 data8 0 // open
632 data8 0 // close
633 data8 0 // creat // 1030
634 data8 0 // link
635 data8 0 // unlink
636 data8 0 // execve
637 data8 0 // chdir
638 data8 0 // fchdir // 1035
639 data8 0 // utimes
640 data8 0 // mknod
641 data8 0 // chmod
642 data8 0 // chown
643 data8 0 // lseek // 1040
644 data8 fsys_getpid // getpid
645 data8 fsys_getppid // getppid
646 data8 0 // mount
647 data8 0 // umount
648 data8 0 // setuid // 1045
649 data8 0 // getuid
650 data8 0 // geteuid
651 data8 0 // ptrace
652 data8 0 // access
653 data8 0 // sync // 1050
654 data8 0 // fsync
655 data8 0 // fdatasync
656 data8 0 // kill
657 data8 0 // rename
658 data8 0 // mkdir // 1055
659 data8 0 // rmdir
660 data8 0 // dup
661 data8 0 // pipe
662 data8 0 // times
663 data8 0 // brk // 1060
664 data8 0 // setgid
665 data8 0 // getgid
666 data8 0 // getegid
667 data8 0 // acct
668 data8 0 // ioctl // 1065
669 data8 0 // fcntl
670 data8 0 // umask
671 data8 0 // chroot
672 data8 0 // ustat
673 data8 0 // dup2 // 1070
674 data8 0 // setreuid
675 data8 0 // setregid
676 data8 0 // getresuid
677 data8 0 // setresuid
678 data8 0 // getresgid // 1075
679 data8 0 // setresgid
680 data8 0 // getgroups
681 data8 0 // setgroups
682 data8 0 // getpgid
683 data8 0 // setpgid // 1080
684 data8 0 // setsid
685 data8 0 // getsid
686 data8 0 // sethostname
687 data8 0 // setrlimit
688 data8 0 // getrlimit // 1085
689 data8 0 // getrusage
690 data8 fsys_gettimeofday // gettimeofday
691 data8 0 // settimeofday
692 data8 0 // select
693 data8 0 // poll // 1090
694 data8 0 // symlink
695 data8 0 // readlink
696 data8 0 // uselib
697 data8 0 // swapon
698 data8 0 // swapoff // 1095
699 data8 0 // reboot
700 data8 0 // truncate
701 data8 0 // ftruncate
702 data8 0 // fchmod
703 data8 0 // fchown // 1100
704 data8 0 // getpriority
705 data8 0 // setpriority
706 data8 0 // statfs
707 data8 0 // fstatfs
708 data8 0 // gettid // 1105
709 data8 0 // semget
710 data8 0 // semop
711 data8 0 // semctl
712 data8 0 // msgget
713 data8 0 // msgsnd // 1110
714 data8 0 // msgrcv
715 data8 0 // msgctl
716 data8 0 // shmget
717 data8 0 // shmat
718 data8 0 // shmdt // 1115
719 data8 0 // shmctl
720 data8 0 // syslog
721 data8 0 // setitimer
722 data8 0 // getitimer
723 data8 0 // 1120
724 data8 0
725 data8 0
726 data8 0 // vhangup
727 data8 0 // lchown
728 data8 0 // remap_file_pages // 1125
729 data8 0 // wait4
730 data8 0 // sysinfo
731 data8 0 // clone
732 data8 0 // setdomainname
733 data8 0 // newuname // 1130
734 data8 0 // adjtimex
735 data8 0
736 data8 0 // init_module
737 data8 0 // delete_module
738 data8 0 // 1135
739 data8 0
740 data8 0 // quotactl
741 data8 0 // bdflush
742 data8 0 // sysfs
743 data8 0 // personality // 1140
744 data8 0 // afs_syscall
745 data8 0 // setfsuid
746 data8 0 // setfsgid
747 data8 0 // getdents
748 data8 0 // flock // 1145
749 data8 0 // readv
750 data8 0 // writev
751 data8 0 // pread64
752 data8 0 // pwrite64
753 data8 0 // sysctl // 1150
754 data8 0 // mmap
755 data8 0 // munmap
756 data8 0 // mlock
757 data8 0 // mlockall
758 data8 0 // mprotect // 1155
759 data8 0 // mremap
760 data8 0 // msync
761 data8 0 // munlock
762 data8 0 // munlockall
763 data8 0 // sched_getparam // 1160
764 data8 0 // sched_setparam
765 data8 0 // sched_getscheduler
766 data8 0 // sched_setscheduler
767 data8 0 // sched_yield
768 data8 0 // sched_get_priority_max // 1165
769 data8 0 // sched_get_priority_min
770 data8 0 // sched_rr_get_interval
771 data8 0 // nanosleep
772 data8 0 // nfsservctl
773 data8 0 // prctl // 1170
774 data8 0 // getpagesize
775 data8 0 // mmap2
776 data8 0 // pciconfig_read
777 data8 0 // pciconfig_write
778 data8 0 // perfmonctl // 1175
779 data8 0 // sigaltstack
780 data8 0 // rt_sigaction
781 data8 0 // rt_sigpending
782 data8 fsys_rt_sigprocmask // rt_sigprocmask
783 data8 0 // rt_sigqueueinfo // 1180
784 data8 0 // rt_sigreturn
785 data8 0 // rt_sigsuspend
786 data8 0 // rt_sigtimedwait
787 data8 0 // getcwd
788 data8 0 // capget // 1185
789 data8 0 // capset
790 data8 0 // sendfile
791 data8 0
792 data8 0
793 data8 0 // socket // 1190
794 data8 0 // bind
795 data8 0 // connect
796 data8 0 // listen
797 data8 0 // accept
798 data8 0 // getsockname // 1195
799 data8 0 // getpeername
800 data8 0 // socketpair
801 data8 0 // send
802 data8 0 // sendto
803 data8 0 // recv // 1200
804 data8 0 // recvfrom
805 data8 0 // shutdown
806 data8 0 // setsockopt
807 data8 0 // getsockopt
808 data8 0 // sendmsg // 1205
809 data8 0 // recvmsg
810 data8 0 // pivot_root
811 data8 0 // mincore
812 data8 0 // madvise
813 data8 0 // newstat // 1210
814 data8 0 // newlstat
815 data8 0 // newfstat
816 data8 0 // clone2
817 data8 0 // getdents64
818 data8 0 // getunwind // 1215
819 data8 0 // readahead
820 data8 0 // setxattr
821 data8 0 // lsetxattr
822 data8 0 // fsetxattr
823 data8 0 // getxattr // 1220
824 data8 0 // lgetxattr
825 data8 0 // fgetxattr
826 data8 0 // listxattr
827 data8 0 // llistxattr
828 data8 0 // flistxattr // 1225
829 data8 0 // removexattr
830 data8 0 // lremovexattr
831 data8 0 // fremovexattr
832 data8 0 // tkill
833 data8 0 // futex // 1230
834 data8 0 // sched_setaffinity
835 data8 0 // sched_getaffinity
836 data8 fsys_set_tid_address // set_tid_address
837 data8 0 // fadvise64_64
838 data8 0 // tgkill // 1235
839 data8 0 // exit_group
840 data8 0 // lookup_dcookie
841 data8 0 // io_setup
842 data8 0 // io_destroy
843 data8 0 // io_getevents // 1240
844 data8 0 // io_submit
845 data8 0 // io_cancel
846 data8 0 // epoll_create
847 data8 0 // epoll_ctl
848 data8 0 // epoll_wait // 1245
849 data8 0 // restart_syscall
850 data8 0 // semtimedop
851 data8 0 // timer_create
852 data8 0 // timer_settime
853 data8 0 // timer_gettime // 1250
854 data8 0 // timer_getoverrun
855 data8 0 // timer_delete
856 data8 0 // clock_settime
857 data8 fsys_clock_gettime // clock_gettime
858 data8 0 // clock_getres // 1255
859 data8 0 // clock_nanosleep
860 data8 0 // fstatfs64
861 data8 0 // statfs64
862 data8 0
863 data8 0 // 1260
864 data8 0
865 data8 0 // mq_open
866 data8 0 // mq_unlink
867 data8 0 // mq_timedsend
868 data8 0 // mq_timedreceive // 1265
869 data8 0 // mq_notify
870 data8 0 // mq_getsetattr
871 data8 0 // kexec_load
872 data8 0
873 data8 0 // 1270
874 data8 0
875 data8 0
876 data8 0
877 data8 0
878 data8 0 // 1275
879 data8 0
880 data8 0
881 data8 0
882 data8 0
883
884 .org fsyscall_table + 8*NR_syscalls // guard against failures to increase NR_syscalls
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 07:52:24 -0500