| blob | 9a260b317d8d430b31c609ae03decb72fbd96a60 |
1 /*
2 * arch/ia64/kernel/entry.S
3 *
4 * Kernel entry points.
5 *
6 * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Copyright (C) 1999, 2002-2003
9 * Asit Mallick <Asit.K.Mallick@intel.com>
10 * Don Dugger <Don.Dugger@intel.com>
11 * Suresh Siddha <suresh.b.siddha@intel.com>
12 * Fenghua Yu <fenghua.yu@intel.com>
13 * Copyright (C) 1999 VA Linux Systems
14 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
15 */
16 /*
17 * ia64_switch_to now places correct virtual mapping in in TR2 for
18 * kernel stack. This allows us to handle interrupts without changing
19 * to physical mode.
20 *
21 * Jonathan Nicklin <nicklin@missioncriticallinux.com>
22 * Patrick O'Rourke <orourke@missioncriticallinux.com>
23 * 11/07/2000
24 */
25 /*
26 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
27 * VA Linux Systems Japan K.K.
28 * pv_ops.
29 */
30 /*
31 * Global (preserved) predicate usage on syscall entry/exit path:
32 *
33 * pKStk: See entry.h.
34 * pUStk: See entry.h.
35 * pSys: See entry.h.
36 * pNonSys: !pSys
37 */
40 #include <asm/asmmacro.h>
41 #include <asm/cache.h>
42 #include <asm/errno.h>
43 #include <asm/kregs.h>
44 #include <asm/asm-offsets.h>
45 #include <asm/pgtable.h>
46 #include <asm/percpu.h>
47 #include <asm/processor.h>
48 #include <asm/thread_info.h>
49 #include <asm/unistd.h>
50 #include <asm/ftrace.h>
52 #include "minstate.h"
54 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
55 /*
56 * execve() is special because in case of success, we need to
57 * setup a null register window frame.
58 */
59 ENTRY(ia64_execve)
60 /*
61 * Allocate 8 input registers since ptrace() may clobber them
62 */
63 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
64 alloc loc1=ar.pfs,8,2,4,0
65 mov loc0=rp
66 .body
67 mov out0=in0 // filename
68 ;; // stop bit between alloc and call
69 mov out1=in1 // argv
70 mov out2=in2 // envp
71 add out3=16,sp // regs
72 br.call.sptk.many rp=sys_execve
73 .ret0:
74 cmp4.ge p6,p7=r8,r0
75 mov ar.pfs=loc1 // restore ar.pfs
76 sxt4 r8=r8 // return 64-bit result
77 ;;
78 stf.spill [sp]=f0
79 (p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode...
80 mov rp=loc0
81 (p6) mov ar.pfs=r0 // clear ar.pfs on success
82 (p7) br.ret.sptk.many rp
84 /*
85 * In theory, we'd have to zap this state only to prevent leaking of
86 * security sensitive state (e.g., if current->mm->dumpable is zero). However,
87 * this executes in less than 20 cycles even on Itanium, so it's not worth
88 * optimizing for...).
89 */
90 mov ar.unat=0; mov ar.lc=0
91 mov r4=0; mov f2=f0; mov b1=r0
92 mov r5=0; mov f3=f0; mov b2=r0
93 mov r6=0; mov f4=f0; mov b3=r0
94 mov r7=0; mov f5=f0; mov b4=r0
95 ldf.fill f12=[sp]; mov f13=f0; mov b5=r0
96 ldf.fill f14=[sp]; ldf.fill f15=[sp]; mov f16=f0
97 ldf.fill f17=[sp]; ldf.fill f18=[sp]; mov f19=f0
98 ldf.fill f20=[sp]; ldf.fill f21=[sp]; mov f22=f0
99 ldf.fill f23=[sp]; ldf.fill f24=[sp]; mov f25=f0
100 ldf.fill f26=[sp]; ldf.fill f27=[sp]; mov f28=f0
101 ldf.fill f29=[sp]; ldf.fill f30=[sp]; mov f31=f0
102 br.ret.sptk.many rp
103 END(ia64_execve)
105 /*
106 * sys_clone2(u64 flags, u64 ustack_base, u64 ustack_size, u64 parent_tidptr, u64 child_tidptr,
107 * u64 tls)
108 */
109 GLOBAL_ENTRY(sys_clone2)
110 /*
111 * Allocate 8 input registers since ptrace() may clobber them
112 */
113 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
114 alloc r16=ar.pfs,8,2,6,0
115 DO_SAVE_SWITCH_STACK
116 adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp
117 mov loc0=rp
118 mov loc1=r16 // save ar.pfs across do_fork
119 .body
120 mov out1=in1
121 mov out3=in2
122 tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
123 mov out4=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
124 ;;
125 (p6) st8 [r2]=in5 // store TLS in r16 for copy_thread()
126 mov out5=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
127 adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
128 mov out0=in0 // out0 = clone_flags
129 br.call.sptk.many rp=do_fork
130 .ret1: .restore sp
131 adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
132 mov ar.pfs=loc1
133 mov rp=loc0
134 br.ret.sptk.many rp
135 END(sys_clone2)
137 /*
138 * sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls)
139 * Deprecated. Use sys_clone2() instead.
140 */
141 GLOBAL_ENTRY(sys_clone)
142 /*
143 * Allocate 8 input registers since ptrace() may clobber them
144 */
145 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
146 alloc r16=ar.pfs,8,2,6,0
147 DO_SAVE_SWITCH_STACK
148 adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp
149 mov loc0=rp
150 mov loc1=r16 // save ar.pfs across do_fork
151 .body
152 mov out1=in1
153 mov out3=16 // stacksize (compensates for 16-byte scratch area)
154 tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
155 mov out4=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
156 ;;
157 (p6) st8 [r2]=in4 // store TLS in r13 (tp)
158 mov out5=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
159 adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
160 mov out0=in0 // out0 = clone_flags
161 br.call.sptk.many rp=do_fork
162 .ret2: .restore sp
163 adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
164 mov ar.pfs=loc1
165 mov rp=loc0
166 br.ret.sptk.many rp
167 END(sys_clone)
168 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
170 /*
171 * prev_task <- ia64_switch_to(struct task_struct *next)
172 * With Ingo's new scheduler, interrupts are disabled when this routine gets
173 * called. The code starting at .map relies on this. The rest of the code
174 * doesn't care about the interrupt masking status.
175 */
176 GLOBAL_ENTRY(__paravirt_switch_to)
177 .prologue
178 alloc r16=ar.pfs,1,0,0,0
179 DO_SAVE_SWITCH_STACK
180 .body
182 adds r22=IA64_TASK_THREAD_KSP_OFFSET,r13
183 movl r25=init_task
184 mov r27=IA64_KR(CURRENT_STACK)
185 adds r21=IA64_TASK_THREAD_KSP_OFFSET,in0
186 dep r20=0,in0,61,3 // physical address of "next"
187 ;;
188 st8 [r22]=sp // save kernel stack pointer of old task
189 shr.u r26=r20,IA64_GRANULE_SHIFT
190 cmp.eq p7,p6=r25,in0
191 ;;
192 /*
193 * If we've already mapped this task's page, we can skip doing it again.
194 */
195 (p6) cmp.eq p7,p6=r26,r27
196 (p6) br.cond.dpnt .map
197 ;;
198 .done:
199 ld8 sp=[r21] // load kernel stack pointer of new task
200 MOV_TO_KR(CURRENT, in0, r8, r9) // update "current" application register
201 mov r8=r13 // return pointer to previously running task
202 mov r13=in0 // set "current" pointer
203 ;;
204 DO_LOAD_SWITCH_STACK
206 #ifdef CONFIG_SMP
207 sync.i // ensure "fc"s done by this CPU are visible on other CPUs
208 #endif
209 br.ret.sptk.many rp // boogie on out in new context
211 .map:
212 RSM_PSR_IC(r25) // interrupts (psr.i) are already disabled here
213 movl r25=PAGE_KERNEL
214 ;;
215 srlz.d
216 or r23=r25,r20 // construct PA | page properties
217 mov r25=IA64_GRANULE_SHIFT<<2
218 ;;
219 MOV_TO_ITIR(p0, r25, r8)
220 MOV_TO_IFA(in0, r8) // VA of next task...
221 ;;
222 mov r25=IA64_TR_CURRENT_STACK
223 MOV_TO_KR(CURRENT_STACK, r26, r8, r9) // remember last page we mapped...
224 ;;
225 itr.d dtr[r25]=r23 // wire in new mapping...
226 SSM_PSR_IC_AND_SRLZ_D(r8, r9) // reenable the psr.ic bit
227 br.cond.sptk .done
228 END(__paravirt_switch_to)
230 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
231 /*
232 * Note that interrupts are enabled during save_switch_stack and load_switch_stack. This
233 * means that we may get an interrupt with "sp" pointing to the new kernel stack while
234 * ar.bspstore is still pointing to the old kernel backing store area. Since ar.rsc,
235 * ar.rnat, ar.bsp, and ar.bspstore are all preserved by interrupts, this is not a
236 * problem. Also, we don't need to specify unwind information for preserved registers
237 * that are not modified in save_switch_stack as the right unwind information is already
238 * specified at the call-site of save_switch_stack.
239 */
241 /*
242 * save_switch_stack:
243 * - r16 holds ar.pfs
244 * - b7 holds address to return to
245 * - rp (b0) holds return address to save
246 */
247 GLOBAL_ENTRY(save_switch_stack)
248 .prologue
249 .altrp b7
250 flushrs // flush dirty regs to backing store (must be first in insn group)
251 .save @priunat,r17
252 mov r17=ar.unat // preserve caller's
253 .body
254 #ifdef CONFIG_ITANIUM
255 adds r2=16+128,sp
256 adds r3=16+64,sp
257 adds r14=SW(R4)+16,sp
258 ;;
259 st8.spill [r14]=r4,16 // spill r4
260 lfetch.fault.excl.nt1 [r3],128
261 ;;
262 lfetch.fault.excl.nt1 [r2],128
263 lfetch.fault.excl.nt1 [r3],128
264 ;;
265 lfetch.fault.excl [r2]
266 lfetch.fault.excl [r3]
267 adds r15=SW(R5)+16,sp
268 #else
269 add r2=16+3*128,sp
270 add r3=16,sp
271 add r14=SW(R4)+16,sp
272 ;;
273 st8.spill [r14]=r4,SW(R6)-SW(R4) // spill r4 and prefetch offset 0x1c0
274 lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x010
275 ;;
276 lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x090
277 lfetch.fault.excl.nt1 [r2],128 // prefetch offset 0x190
278 ;;
279 lfetch.fault.excl.nt1 [r3] // prefetch offset 0x110
280 lfetch.fault.excl.nt1 [r2] // prefetch offset 0x210
281 adds r15=SW(R5)+16,sp
282 #endif
283 ;;
284 st8.spill [r15]=r5,SW(R7)-SW(R5) // spill r5
285 mov.m ar.rsc=0 // put RSE in mode: enforced lazy, little endian, pl 0
286 add r2=SW(F2)+16,sp // r2 = &sw->f2
287 ;;
288 st8.spill [r14]=r6,SW(B0)-SW(R6) // spill r6
289 mov.m r18=ar.fpsr // preserve fpsr
290 add r3=SW(F3)+16,sp // r3 = &sw->f3
291 ;;
292 stf.spill [r2]=f2,32
293 mov.m r19=ar.rnat
294 mov r21=b0
296 stf.spill [r3]=f3,32
297 st8.spill [r15]=r7,SW(B2)-SW(R7) // spill r7
298 mov r22=b1
299 ;;
300 // since we're done with the spills, read and save ar.unat:
301 mov.m r29=ar.unat
302 mov.m r20=ar.bspstore
303 mov r23=b2
304 stf.spill [r2]=f4,32
305 stf.spill [r3]=f5,32
306 mov r24=b3
307 ;;
308 st8 [r14]=r21,SW(B1)-SW(B0) // save b0
309 st8 [r15]=r23,SW(B3)-SW(B2) // save b2
310 mov r25=b4
311 mov r26=b5
312 ;;
313 st8 [r14]=r22,SW(B4)-SW(B1) // save b1
314 st8 [r15]=r24,SW(AR_PFS)-SW(B3) // save b3
315 mov r21=ar.lc // I-unit
316 stf.spill [r2]=f12,32
317 stf.spill [r3]=f13,32
318 ;;
319 st8 [r14]=r25,SW(B5)-SW(B4) // save b4
320 st8 [r15]=r16,SW(AR_LC)-SW(AR_PFS) // save ar.pfs
321 stf.spill [r2]=f14,32
322 stf.spill [r3]=f15,32
323 ;;
324 st8 [r14]=r26 // save b5
325 st8 [r15]=r21 // save ar.lc
326 stf.spill [r2]=f16,32
327 stf.spill [r3]=f17,32
328 ;;
329 stf.spill [r2]=f18,32
330 stf.spill [r3]=f19,32
331 ;;
332 stf.spill [r2]=f20,32
333 stf.spill [r3]=f21,32
334 ;;
335 stf.spill [r2]=f22,32
336 stf.spill [r3]=f23,32
337 ;;
338 stf.spill [r2]=f24,32
339 stf.spill [r3]=f25,32
340 ;;
341 stf.spill [r2]=f26,32
342 stf.spill [r3]=f27,32
343 ;;
344 stf.spill [r2]=f28,32
345 stf.spill [r3]=f29,32
346 ;;
347 stf.spill [r2]=f30,SW(AR_UNAT)-SW(F30)
348 stf.spill [r3]=f31,SW(PR)-SW(F31)
349 add r14=SW(CALLER_UNAT)+16,sp
350 ;;
351 st8 [r2]=r29,SW(AR_RNAT)-SW(AR_UNAT) // save ar.unat
352 st8 [r14]=r17,SW(AR_FPSR)-SW(CALLER_UNAT) // save caller_unat
353 mov r21=pr
354 ;;
355 st8 [r2]=r19,SW(AR_BSPSTORE)-SW(AR_RNAT) // save ar.rnat
356 st8 [r3]=r21 // save predicate registers
357 ;;
358 st8 [r2]=r20 // save ar.bspstore
359 st8 [r14]=r18 // save fpsr
360 mov ar.rsc=3 // put RSE back into eager mode, pl 0
361 br.cond.sptk.many b7
362 END(save_switch_stack)
364 /*
365 * load_switch_stack:
366 * - "invala" MUST be done at call site (normally in DO_LOAD_SWITCH_STACK)
367 * - b7 holds address to return to
368 * - must not touch r8-r11
369 */
370 GLOBAL_ENTRY(load_switch_stack)
371 .prologue
372 .altrp b7
374 .body
375 lfetch.fault.nt1 [sp]
376 adds r2=SW(AR_BSPSTORE)+16,sp
377 adds r3=SW(AR_UNAT)+16,sp
378 mov ar.rsc=0 // put RSE into enforced lazy mode
379 adds r14=SW(CALLER_UNAT)+16,sp
380 adds r15=SW(AR_FPSR)+16,sp
381 ;;
382 ld8 r27=[r2],(SW(B0)-SW(AR_BSPSTORE)) // bspstore
383 ld8 r29=[r3],(SW(B1)-SW(AR_UNAT)) // unat
384 ;;
385 ld8 r21=[r2],16 // restore b0
386 ld8 r22=[r3],16 // restore b1
387 ;;
388 ld8 r23=[r2],16 // restore b2
389 ld8 r24=[r3],16 // restore b3
390 ;;
391 ld8 r25=[r2],16 // restore b4
392 ld8 r26=[r3],16 // restore b5
393 ;;
394 ld8 r16=[r2],(SW(PR)-SW(AR_PFS)) // ar.pfs
395 ld8 r17=[r3],(SW(AR_RNAT)-SW(AR_LC)) // ar.lc
396 ;;
397 ld8 r28=[r2] // restore pr
398 ld8 r30=[r3] // restore rnat
399 ;;
400 ld8 r18=[r14],16 // restore caller's unat
401 ld8 r19=[r15],24 // restore fpsr
402 ;;
403 ldf.fill f2=[r14],32
404 ldf.fill f3=[r15],32
405 ;;
406 ldf.fill f4=[r14],32
407 ldf.fill f5=[r15],32
408 ;;
409 ldf.fill f12=[r14],32
410 ldf.fill f13=[r15],32
411 ;;
412 ldf.fill f14=[r14],32
413 ldf.fill f15=[r15],32
414 ;;
415 ldf.fill f16=[r14],32
416 ldf.fill f17=[r15],32
417 ;;
418 ldf.fill f18=[r14],32
419 ldf.fill f19=[r15],32
420 mov b0=r21
421 ;;
422 ldf.fill f20=[r14],32
423 ldf.fill f21=[r15],32
424 mov b1=r22
425 ;;
426 ldf.fill f22=[r14],32
427 ldf.fill f23=[r15],32
428 mov b2=r23
429 ;;
430 mov ar.bspstore=r27
431 mov ar.unat=r29 // establish unat holding the NaT bits for r4-r7
432 mov b3=r24
433 ;;
434 ldf.fill f24=[r14],32
435 ldf.fill f25=[r15],32
436 mov b4=r25
437 ;;
438 ldf.fill f26=[r14],32
439 ldf.fill f27=[r15],32
440 mov b5=r26
441 ;;
442 ldf.fill f28=[r14],32
443 ldf.fill f29=[r15],32
444 mov ar.pfs=r16
445 ;;
446 ldf.fill f30=[r14],32
447 ldf.fill f31=[r15],24
448 mov ar.lc=r17
449 ;;
450 ld8.fill r4=[r14],16
451 ld8.fill r5=[r15],16
452 mov pr=r28,-1
453 ;;
454 ld8.fill r6=[r14],16
455 ld8.fill r7=[r15],16
457 mov ar.unat=r18 // restore caller's unat
458 mov ar.rnat=r30 // must restore after bspstore but before rsc!
459 mov ar.fpsr=r19 // restore fpsr
460 mov ar.rsc=3 // put RSE back into eager mode, pl 0
461 br.cond.sptk.many b7
462 END(load_switch_stack)
464 GLOBAL_ENTRY(prefetch_stack)
465 add r14 = -IA64_SWITCH_STACK_SIZE, sp
466 add r15 = IA64_TASK_THREAD_KSP_OFFSET, in0
467 ;;
468 ld8 r16 = [r15] // load next's stack pointer
469 lfetch.fault.excl [r14], 128
470 ;;
471 lfetch.fault.excl [r14], 128
472 lfetch.fault [r16], 128
473 ;;
474 lfetch.fault.excl [r14], 128
475 lfetch.fault [r16], 128
476 ;;
477 lfetch.fault.excl [r14], 128
478 lfetch.fault [r16], 128
479 ;;
480 lfetch.fault.excl [r14], 128
481 lfetch.fault [r16], 128
482 ;;
483 lfetch.fault [r16], 128
484 br.ret.sptk.many rp
485 END(prefetch_stack)
487 GLOBAL_ENTRY(kernel_execve)
488 rum psr.ac
489 mov r15=__NR_execve // put syscall number in place
490 break __BREAK_SYSCALL
491 br.ret.sptk.many rp
492 END(kernel_execve)
494 GLOBAL_ENTRY(clone)
495 mov r15=__NR_clone // put syscall number in place
496 break __BREAK_SYSCALL
497 br.ret.sptk.many rp
498 END(clone)
500 /*
501 * Invoke a system call, but do some tracing before and after the call.
502 * We MUST preserve the current register frame throughout this routine
503 * because some system calls (such as ia64_execve) directly
504 * manipulate ar.pfs.
505 */
506 GLOBAL_ENTRY(ia64_trace_syscall)
507 PT_REGS_UNWIND_INFO(0)
508 /*
509 * We need to preserve the scratch registers f6-f11 in case the system
510 * call is sigreturn.
511 */
512 adds r16=PT(F6)+16,sp
513 adds r17=PT(F7)+16,sp
514 ;;
515 stf.spill [r16]=f6,32
516 stf.spill [r17]=f7,32
517 ;;
518 stf.spill [r16]=f8,32
519 stf.spill [r17]=f9,32
520 ;;
521 stf.spill [r16]=f10
522 stf.spill [r17]=f11
523 br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
524 cmp.lt p6,p0=r8,r0 // check tracehook
525 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
526 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
527 mov r10=0
528 (p6) br.cond.sptk strace_error // syscall failed ->
529 adds r16=PT(F6)+16,sp
530 adds r17=PT(F7)+16,sp
531 ;;
532 ldf.fill f6=[r16],32
533 ldf.fill f7=[r17],32
534 ;;
535 ldf.fill f8=[r16],32
536 ldf.fill f9=[r17],32
537 ;;
538 ldf.fill f10=[r16]
539 ldf.fill f11=[r17]
540 // the syscall number may have changed, so re-load it and re-calculate the
541 // syscall entry-point:
542 adds r15=PT(R15)+16,sp // r15 = &pt_regs.r15 (syscall #)
543 ;;
544 ld8 r15=[r15]
545 mov r3=NR_syscalls - 1
546 ;;
547 adds r15=-1024,r15
548 movl r16=sys_call_table
549 ;;
550 shladd r20=r15,3,r16 // r20 = sys_call_table + 8*(syscall-1024)
551 cmp.leu p6,p7=r15,r3
552 ;;
553 (p6) ld8 r20=[r20] // load address of syscall entry point
554 (p7) movl r20=sys_ni_syscall
555 ;;
556 mov b6=r20
557 br.call.sptk.many rp=b6 // do the syscall
558 .strace_check_retval:
559 cmp.lt p6,p0=r8,r0 // syscall failed?
560 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
561 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
562 mov r10=0
563 (p6) br.cond.sptk strace_error // syscall failed ->
564 ;; // avoid RAW on r10
565 .strace_save_retval:
566 .mem.offset 0,0; st8.spill [r2]=r8 // store return value in slot for r8
567 .mem.offset 8,0; st8.spill [r3]=r10 // clear error indication in slot for r10
568 br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
569 .ret3:
570 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
571 (pUStk) rsm psr.i // disable interrupts
572 br.cond.sptk ia64_work_pending_syscall_end
574 strace_error:
575 ld8 r3=[r2] // load pt_regs.r8
576 sub r9=0,r8 // negate return value to get errno value
577 ;;
578 cmp.ne p6,p0=r3,r0 // is pt_regs.r8!=0?
579 adds r3=16,r2 // r3=&pt_regs.r10
580 ;;
581 (p6) mov r10=-1
582 (p6) mov r8=r9
583 br.cond.sptk .strace_save_retval
584 END(ia64_trace_syscall)
586 /*
587 * When traced and returning from sigreturn, we invoke syscall_trace but then
588 * go straight to ia64_leave_kernel rather than ia64_leave_syscall.
589 */
590 GLOBAL_ENTRY(ia64_strace_leave_kernel)
591 PT_REGS_UNWIND_INFO(0)
592 { /*
593 * Some versions of gas generate bad unwind info if the first instruction of a
594 * procedure doesn't go into the first slot of a bundle. This is a workaround.
595 */
596 nop.m 0
597 nop.i 0
598 br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
599 }
600 .ret4: br.cond.sptk ia64_leave_kernel
601 END(ia64_strace_leave_kernel)
603 GLOBAL_ENTRY(ia64_ret_from_clone)
604 PT_REGS_UNWIND_INFO(0)
605 { /*
606 * Some versions of gas generate bad unwind info if the first instruction of a
607 * procedure doesn't go into the first slot of a bundle. This is a workaround.
608 */
609 nop.m 0
610 nop.i 0
611 /*
612 * We need to call schedule_tail() to complete the scheduling process.
613 * Called by ia64_switch_to() after do_fork()->copy_thread(). r8 contains the
614 * address of the previously executing task.
615 */
616 br.call.sptk.many rp=ia64_invoke_schedule_tail
617 }
618 .ret8:
619 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
620 ;;
621 ld4 r2=[r2]
622 ;;
623 mov r8=0
624 and r2=_TIF_SYSCALL_TRACEAUDIT,r2
625 ;;
626 cmp.ne p6,p0=r2,r0
627 (p6) br.cond.spnt .strace_check_retval
628 ;; // added stop bits to prevent r8 dependency
629 END(ia64_ret_from_clone)
630 // fall through
631 GLOBAL_ENTRY(ia64_ret_from_syscall)
632 PT_REGS_UNWIND_INFO(0)
633 cmp.ge p6,p7=r8,r0 // syscall executed successfully?
634 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
635 mov r10=r0 // clear error indication in r10
636 (p7) br.cond.spnt handle_syscall_error // handle potential syscall failure
637 #ifdef CONFIG_PARAVIRT
638 ;;
639 br.cond.sptk.few ia64_leave_syscall
640 ;;
641 #endif /* CONFIG_PARAVIRT */
642 END(ia64_ret_from_syscall)
643 #ifndef CONFIG_PARAVIRT
644 // fall through
645 #endif
646 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
648 /*
649 * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
650 * need to switch to bank 0 and doesn't restore the scratch registers.
651 * To avoid leaking kernel bits, the scratch registers are set to
652 * the following known-to-be-safe values:
653 *
654 * r1: restored (global pointer)
655 * r2: cleared
656 * r3: 1 (when returning to user-level)
657 * r8-r11: restored (syscall return value(s))
658 * r12: restored (user-level stack pointer)
659 * r13: restored (user-level thread pointer)
660 * r14: set to __kernel_syscall_via_epc
661 * r15: restored (syscall #)
662 * r16-r17: cleared
663 * r18: user-level b6
664 * r19: cleared
665 * r20: user-level ar.fpsr
666 * r21: user-level b0
667 * r22: cleared
668 * r23: user-level ar.bspstore
669 * r24: user-level ar.rnat
670 * r25: user-level ar.unat
671 * r26: user-level ar.pfs
672 * r27: user-level ar.rsc
673 * r28: user-level ip
674 * r29: user-level psr
675 * r30: user-level cfm
676 * r31: user-level pr
677 * f6-f11: cleared
678 * pr: restored (user-level pr)
679 * b0: restored (user-level rp)
680 * b6: restored
681 * b7: set to __kernel_syscall_via_epc
682 * ar.unat: restored (user-level ar.unat)
683 * ar.pfs: restored (user-level ar.pfs)
684 * ar.rsc: restored (user-level ar.rsc)
685 * ar.rnat: restored (user-level ar.rnat)
686 * ar.bspstore: restored (user-level ar.bspstore)
687 * ar.fpsr: restored (user-level ar.fpsr)
688 * ar.ccv: cleared
689 * ar.csd: cleared
690 * ar.ssd: cleared
691 */
692 GLOBAL_ENTRY(__paravirt_leave_syscall)
693 PT_REGS_UNWIND_INFO(0)
694 /*
695 * work.need_resched etc. mustn't get changed by this CPU before it returns to
696 * user- or fsys-mode, hence we disable interrupts early on.
697 *
698 * p6 controls whether current_thread_info()->flags needs to be check for
699 * extra work. We always check for extra work when returning to user-level.
700 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
701 * is 0. After extra work processing has been completed, execution
702 * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check
703 * needs to be redone.
704 */
705 #ifdef CONFIG_PREEMPT
706 RSM_PSR_I(p0, r2, r18) // disable interrupts
707 cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
708 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
709 ;;
710 .pred.rel.mutex pUStk,pKStk
711 (pKStk) ld4 r21=[r20] // r21 <- preempt_count
712 (pUStk) mov r21=0 // r21 <- 0
713 ;;
714 cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
715 #else /* !CONFIG_PREEMPT */
716 RSM_PSR_I(pUStk, r2, r18)
717 cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
718 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
719 #endif
720 .global __paravirt_work_processed_syscall;
721 __paravirt_work_processed_syscall:
722 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
723 adds r2=PT(LOADRS)+16,r12
724 MOV_FROM_ITC(pUStk, p9, r22, r19) // fetch time at leave
725 adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
726 ;;
727 (p6) ld4 r31=[r18] // load current_thread_info()->flags
728 ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
729 adds r3=PT(AR_BSPSTORE)+16,r12 // deferred
730 ;;
731 #else
732 adds r2=PT(LOADRS)+16,r12
733 adds r3=PT(AR_BSPSTORE)+16,r12
734 adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
735 ;;
736 (p6) ld4 r31=[r18] // load current_thread_info()->flags
737 ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
738 nop.i 0
739 ;;
740 #endif
741 mov r16=ar.bsp // M2 get existing backing store pointer
742 ld8 r18=[r2],PT(R9)-PT(B6) // load b6
743 (p6) and r15=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
744 ;;
745 ld8 r23=[r3],PT(R11)-PT(AR_BSPSTORE) // load ar.bspstore (may be garbage)
746 (p6) cmp4.ne.unc p6,p0=r15, r0 // any special work pending?
747 (p6) br.cond.spnt .work_pending_syscall
748 ;;
749 // start restoring the state saved on the kernel stack (struct pt_regs):
750 ld8 r9=[r2],PT(CR_IPSR)-PT(R9)
751 ld8 r11=[r3],PT(CR_IIP)-PT(R11)
752 (pNonSys) break 0 // bug check: we shouldn't be here if pNonSys is TRUE!
753 ;;
754 invala // M0|1 invalidate ALAT
755 RSM_PSR_I_IC(r28, r29, r30) // M2 turn off interrupts and interruption collection
756 cmp.eq p9,p0=r0,r0 // A set p9 to indicate that we should restore cr.ifs
758 ld8 r29=[r2],16 // M0|1 load cr.ipsr
759 ld8 r28=[r3],16 // M0|1 load cr.iip
760 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
761 (pUStk) add r14=TI_AC_LEAVE+IA64_TASK_SIZE,r13
762 ;;
763 ld8 r30=[r2],16 // M0|1 load cr.ifs
764 ld8 r25=[r3],16 // M0|1 load ar.unat
765 (pUStk) add r15=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
766 ;;
767 #else
768 mov r22=r0 // A clear r22
769 ;;
770 ld8 r30=[r2],16 // M0|1 load cr.ifs
771 ld8 r25=[r3],16 // M0|1 load ar.unat
772 (pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
773 ;;
774 #endif
775 ld8 r26=[r2],PT(B0)-PT(AR_PFS) // M0|1 load ar.pfs
776 MOV_FROM_PSR(pKStk, r22, r21) // M2 read PSR now that interrupts are disabled
777 nop 0
778 ;;
779 ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
780 ld8 r27=[r3],PT(PR)-PT(AR_RSC) // M0|1 load ar.rsc
781 mov f6=f0 // F clear f6
782 ;;
783 ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT) // M0|1 load ar.rnat (may be garbage)
784 ld8 r31=[r3],PT(R1)-PT(PR) // M0|1 load predicates
785 mov f7=f0 // F clear f7
786 ;;
787 ld8 r20=[r2],PT(R12)-PT(AR_FPSR) // M0|1 load ar.fpsr
788 ld8.fill r1=[r3],16 // M0|1 load r1
789 (pUStk) mov r17=1 // A
790 ;;
791 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
792 (pUStk) st1 [r15]=r17 // M2|3
793 #else
794 (pUStk) st1 [r14]=r17 // M2|3
795 #endif
796 ld8.fill r13=[r3],16 // M0|1
797 mov f8=f0 // F clear f8
798 ;;
799 ld8.fill r12=[r2] // M0|1 restore r12 (sp)
800 ld8.fill r15=[r3] // M0|1 restore r15
801 mov b6=r18 // I0 restore b6
803 LOAD_PHYS_STACK_REG_SIZE(r17)
804 mov f9=f0 // F clear f9
805 (pKStk) br.cond.dpnt.many skip_rbs_switch // B
807 srlz.d // M0 ensure interruption collection is off (for cover)
808 shr.u r18=r19,16 // I0|1 get byte size of existing "dirty" partition
809 COVER // B add current frame into dirty partition & set cr.ifs
810 ;;
811 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
812 mov r19=ar.bsp // M2 get new backing store pointer
813 st8 [r14]=r22 // M save time at leave
814 mov f10=f0 // F clear f10
816 mov r22=r0 // A clear r22
817 movl r14=__kernel_syscall_via_epc // X
818 ;;
819 #else
820 mov r19=ar.bsp // M2 get new backing store pointer
821 mov f10=f0 // F clear f10
823 nop.m 0
824 movl r14=__kernel_syscall_via_epc // X
825 ;;
826 #endif
827 mov.m ar.csd=r0 // M2 clear ar.csd
828 mov.m ar.ccv=r0 // M2 clear ar.ccv
829 mov b7=r14 // I0 clear b7 (hint with __kernel_syscall_via_epc)
831 mov.m ar.ssd=r0 // M2 clear ar.ssd
832 mov f11=f0 // F clear f11
833 br.cond.sptk.many rbs_switch // B
834 END(__paravirt_leave_syscall)
836 GLOBAL_ENTRY(__paravirt_leave_kernel)
837 PT_REGS_UNWIND_INFO(0)
838 /*
839 * work.need_resched etc. mustn't get changed by this CPU before it returns to
840 * user- or fsys-mode, hence we disable interrupts early on.
841 *
842 * p6 controls whether current_thread_info()->flags needs to be check for
843 * extra work. We always check for extra work when returning to user-level.
844 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
845 * is 0. After extra work processing has been completed, execution
846 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
847 * needs to be redone.
848 */
849 #ifdef CONFIG_PREEMPT
850 RSM_PSR_I(p0, r17, r31) // disable interrupts
851 cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
852 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
853 ;;
854 .pred.rel.mutex pUStk,pKStk
855 (pKStk) ld4 r21=[r20] // r21 <- preempt_count
856 (pUStk) mov r21=0 // r21 <- 0
857 ;;
858 cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
859 #else
860 RSM_PSR_I(pUStk, r17, r31)
861 cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
862 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
863 #endif
864 .work_processed_kernel:
865 adds r17=TI_FLAGS+IA64_TASK_SIZE,r13
866 ;;
867 (p6) ld4 r31=[r17] // load current_thread_info()->flags
868 adds r21=PT(PR)+16,r12
869 ;;
871 lfetch [r21],PT(CR_IPSR)-PT(PR)
872 adds r2=PT(B6)+16,r12
873 adds r3=PT(R16)+16,r12
874 ;;
875 lfetch [r21]
876 ld8 r28=[r2],8 // load b6
877 adds r29=PT(R24)+16,r12
879 ld8.fill r16=[r3],PT(AR_CSD)-PT(R16)
880 adds r30=PT(AR_CCV)+16,r12
881 (p6) and r19=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
882 ;;
883 ld8.fill r24=[r29]
884 ld8 r15=[r30] // load ar.ccv
885 (p6) cmp4.ne.unc p6,p0=r19, r0 // any special work pending?
886 ;;
887 ld8 r29=[r2],16 // load b7
888 ld8 r30=[r3],16 // load ar.csd
889 (p6) br.cond.spnt .work_pending
890 ;;
891 ld8 r31=[r2],16 // load ar.ssd
892 ld8.fill r8=[r3],16
893 ;;
894 ld8.fill r9=[r2],16
895 ld8.fill r10=[r3],PT(R17)-PT(R10)
896 ;;
897 ld8.fill r11=[r2],PT(R18)-PT(R11)
898 ld8.fill r17=[r3],16
899 ;;
900 ld8.fill r18=[r2],16
901 ld8.fill r19=[r3],16
902 ;;
903 ld8.fill r20=[r2],16
904 ld8.fill r21=[r3],16
905 mov ar.csd=r30
906 mov ar.ssd=r31
907 ;;
908 RSM_PSR_I_IC(r23, r22, r25) // initiate turning off of interrupt and interruption collection
909 invala // invalidate ALAT
910 ;;
911 ld8.fill r22=[r2],24
912 ld8.fill r23=[r3],24
913 mov b6=r28
914 ;;
915 ld8.fill r25=[r2],16
916 ld8.fill r26=[r3],16
917 mov b7=r29
918 ;;
919 ld8.fill r27=[r2],16
920 ld8.fill r28=[r3],16
921 ;;
922 ld8.fill r29=[r2],16
923 ld8.fill r30=[r3],24
924 ;;
925 ld8.fill r31=[r2],PT(F9)-PT(R31)
926 adds r3=PT(F10)-PT(F6),r3
927 ;;
928 ldf.fill f9=[r2],PT(F6)-PT(F9)
929 ldf.fill f10=[r3],PT(F8)-PT(F10)
930 ;;
931 ldf.fill f6=[r2],PT(F7)-PT(F6)
932 ;;
933 ldf.fill f7=[r2],PT(F11)-PT(F7)
934 ldf.fill f8=[r3],32
935 ;;
936 srlz.d // ensure that inter. collection is off (VHPT is don't care, since text is pinned)
937 mov ar.ccv=r15
938 ;;
939 ldf.fill f11=[r2]
940 BSW_0(r2, r3, r15) // switch back to bank 0 (no stop bit required beforehand...)
941 ;;
942 (pUStk) mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
943 adds r16=PT(CR_IPSR)+16,r12
944 adds r17=PT(CR_IIP)+16,r12
946 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
947 .pred.rel.mutex pUStk,pKStk
948 MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled
949 MOV_FROM_ITC(pUStk, p9, r22, r29) // M fetch time at leave
950 nop.i 0
951 ;;
952 #else
953 MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled
954 nop.i 0
955 nop.i 0
956 ;;
957 #endif
958 ld8 r29=[r16],16 // load cr.ipsr
959 ld8 r28=[r17],16 // load cr.iip
960 ;;
961 ld8 r30=[r16],16 // load cr.ifs
962 ld8 r25=[r17],16 // load ar.unat
963 ;;
964 ld8 r26=[r16],16 // load ar.pfs
965 ld8 r27=[r17],16 // load ar.rsc
966 cmp.eq p9,p0=r0,r0 // set p9 to indicate that we should restore cr.ifs
967 ;;
968 ld8 r24=[r16],16 // load ar.rnat (may be garbage)
969 ld8 r23=[r17],16 // load ar.bspstore (may be garbage)
970 ;;
971 ld8 r31=[r16],16 // load predicates
972 ld8 r21=[r17],16 // load b0
973 ;;
974 ld8 r19=[r16],16 // load ar.rsc value for "loadrs"
975 ld8.fill r1=[r17],16 // load r1
976 ;;
977 ld8.fill r12=[r16],16
978 ld8.fill r13=[r17],16
979 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
980 (pUStk) adds r3=TI_AC_LEAVE+IA64_TASK_SIZE,r18
981 #else
982 (pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18
983 #endif
984 ;;
985 ld8 r20=[r16],16 // ar.fpsr
986 ld8.fill r15=[r17],16
987 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
988 (pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 // deferred
989 #endif
990 ;;
991 ld8.fill r14=[r16],16
992 ld8.fill r2=[r17]
993 (pUStk) mov r17=1
994 ;;
995 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
996 // mmi_ : ld8 st1 shr;; mmi_ : st8 st1 shr;;
997 // mib : mov add br -> mib : ld8 add br
998 // bbb_ : br nop cover;; mbb_ : mov br cover;;
999 //
1000 // no one require bsp in r16 if (pKStk) branch is selected.
1001 (pUStk) st8 [r3]=r22 // save time at leave
1002 (pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
1003 shr.u r18=r19,16 // get byte size of existing "dirty" partition
1004 ;;
1005 ld8.fill r3=[r16] // deferred
1006 LOAD_PHYS_STACK_REG_SIZE(r17)
1007 (pKStk) br.cond.dpnt skip_rbs_switch
1008 mov r16=ar.bsp // get existing backing store pointer
1009 #else
1010 ld8.fill r3=[r16]
1011 (pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
1012 shr.u r18=r19,16 // get byte size of existing "dirty" partition
1013 ;;
1014 mov r16=ar.bsp // get existing backing store pointer
1015 LOAD_PHYS_STACK_REG_SIZE(r17)
1016 (pKStk) br.cond.dpnt skip_rbs_switch
1017 #endif
1019 /*
1020 * Restore user backing store.
1021 *
1022 * NOTE: alloc, loadrs, and cover can't be predicated.
1023 */
1024 (pNonSys) br.cond.dpnt dont_preserve_current_frame
1025 COVER // add current frame into dirty partition and set cr.ifs
1026 ;;
1027 mov r19=ar.bsp // get new backing store pointer
1028 rbs_switch:
1029 sub r16=r16,r18 // krbs = old bsp - size of dirty partition
1030 cmp.ne p9,p0=r0,r0 // clear p9 to skip restore of cr.ifs
1031 ;;
1032 sub r19=r19,r16 // calculate total byte size of dirty partition
1033 add r18=64,r18 // don't force in0-in7 into memory...
1034 ;;
1035 shl r19=r19,16 // shift size of dirty partition into loadrs position
1036 ;;
1037 dont_preserve_current_frame:
1038 /*
1039 * To prevent leaking bits between the kernel and user-space,
1040 * we must clear the stacked registers in the "invalid" partition here.
1041 * Not pretty, but at least it's fast (3.34 registers/cycle on Itanium,
1042 * 5 registers/cycle on McKinley).
1043 */
1044 # define pRecurse p6
1045 # define pReturn p7
1046 #ifdef CONFIG_ITANIUM
1047 # define Nregs 10
1048 #else
1049 # define Nregs 14
1050 #endif
1051 alloc loc0=ar.pfs,2,Nregs-2,2,0
1052 shr.u loc1=r18,9 // RNaTslots <= floor(dirtySize / (64*8))
1053 sub r17=r17,r18 // r17 = (physStackedSize + 8) - dirtySize
1054 ;;
1055 mov ar.rsc=r19 // load ar.rsc to be used for "loadrs"
1056 shladd in0=loc1,3,r17
1057 mov in1=0
1058 ;;
1059 TEXT_ALIGN(32)
1060 rse_clear_invalid:
1061 #ifdef CONFIG_ITANIUM
1062 // cycle 0
1063 { .mii
1064 alloc loc0=ar.pfs,2,Nregs-2,2,0
1065 cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse
1066 add out0=-Nregs*8,in0
1067 }{ .mfb
1068 add out1=1,in1 // increment recursion count
1069 nop.f 0
1070 nop.b 0 // can't do br.call here because of alloc (WAW on CFM)
1071 ;;
1072 }{ .mfi // cycle 1
1073 mov loc1=0
1074 nop.f 0
1075 mov loc2=0
1076 }{ .mib
1077 mov loc3=0
1078 mov loc4=0
1079 (pRecurse) br.call.sptk.many b0=rse_clear_invalid
1081 }{ .mfi // cycle 2
1082 mov loc5=0
1083 nop.f 0
1084 cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret
1085 }{ .mib
1086 mov loc6=0
1087 mov loc7=0
1088 (pReturn) br.ret.sptk.many b0
1089 }
1090 #else /* !CONFIG_ITANIUM */
1091 alloc loc0=ar.pfs,2,Nregs-2,2,0
1092 cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse
1093 add out0=-Nregs*8,in0
1094 add out1=1,in1 // increment recursion count
1095 mov loc1=0
1096 mov loc2=0
1097 ;;
1098 mov loc3=0
1099 mov loc4=0
1100 mov loc5=0
1101 mov loc6=0
1102 mov loc7=0
1103 (pRecurse) br.call.dptk.few b0=rse_clear_invalid
1104 ;;
1105 mov loc8=0
1106 mov loc9=0
1107 cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret
1108 mov loc10=0
1109 mov loc11=0
1110 (pReturn) br.ret.dptk.many b0
1111 #endif /* !CONFIG_ITANIUM */
1112 # undef pRecurse
1113 # undef pReturn
1114 ;;
1115 alloc r17=ar.pfs,0,0,0,0 // drop current register frame
1116 ;;
1117 loadrs
1118 ;;
1119 skip_rbs_switch:
1120 mov ar.unat=r25 // M2
1121 (pKStk) extr.u r22=r22,21,1 // I0 extract current value of psr.pp from r22
1122 (pLvSys)mov r19=r0 // A clear r19 for leave_syscall, no-op otherwise
1123 ;;
1124 (pUStk) mov ar.bspstore=r23 // M2
1125 (pKStk) dep r29=r22,r29,21,1 // I0 update ipsr.pp with psr.pp
1126 (pLvSys)mov r16=r0 // A clear r16 for leave_syscall, no-op otherwise
1127 ;;
1128 MOV_TO_IPSR(p0, r29, r25) // M2
1129 mov ar.pfs=r26 // I0
1130 (pLvSys)mov r17=r0 // A clear r17 for leave_syscall, no-op otherwise
1132 MOV_TO_IFS(p9, r30, r25)// M2
1133 mov b0=r21 // I0
1134 (pLvSys)mov r18=r0 // A clear r18 for leave_syscall, no-op otherwise
1136 mov ar.fpsr=r20 // M2
1137 MOV_TO_IIP(r28, r25) // M2
1138 nop 0
1139 ;;
1140 (pUStk) mov ar.rnat=r24 // M2 must happen with RSE in lazy mode
1141 nop 0
1142 (pLvSys)mov r2=r0
1144 mov ar.rsc=r27 // M2
1145 mov pr=r31,-1 // I0
1146 RFI // B
1148 /*
1149 * On entry:
1150 * r20 = ¤t->thread_info->pre_count (if CONFIG_PREEMPT)
1151 * r31 = current->thread_info->flags
1152 * On exit:
1153 * p6 = TRUE if work-pending-check needs to be redone
1154 *
1155 * Interrupts are disabled on entry, reenabled depend on work, and
1156 * disabled on exit.
1157 */
1158 .work_pending_syscall:
1159 add r2=-8,r2
1160 add r3=-8,r3
1161 ;;
1162 st8 [r2]=r8
1163 st8 [r3]=r10
1164 .work_pending:
1165 tbit.z p6,p0=r31,TIF_NEED_RESCHED // is resched not needed?
1166 (p6) br.cond.sptk.few .notify
1167 #ifdef CONFIG_PREEMPT
1168 (pKStk) dep r21=-1,r0,PREEMPT_ACTIVE_BIT,1
1169 ;;
1170 (pKStk) st4 [r20]=r21
1171 #endif
1172 SSM_PSR_I(p0, p6, r2) // enable interrupts
1173 br.call.spnt.many rp=schedule
1174 .ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1 (re-check)
1175 RSM_PSR_I(p0, r2, r20) // disable interrupts
1176 ;;
1177 #ifdef CONFIG_PREEMPT
1178 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
1179 ;;
1180 (pKStk) st4 [r20]=r0 // preempt_count() <- 0
1181 #endif
1182 (pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
1183 br.cond.sptk.many .work_processed_kernel
1185 .notify:
1186 (pUStk) br.call.spnt.many rp=notify_resume_user
1187 .ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0 (don't re-check)
1188 (pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
1189 br.cond.sptk.many .work_processed_kernel
1191 .global __paravirt_pending_syscall_end;
1192 __paravirt_pending_syscall_end:
1193 adds r2=PT(R8)+16,r12
1194 adds r3=PT(R10)+16,r12
1195 ;;
1196 ld8 r8=[r2]
1197 ld8 r10=[r3]
1198 br.cond.sptk.many __paravirt_work_processed_syscall_target
1199 END(__paravirt_leave_kernel)
1201 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
1202 ENTRY(handle_syscall_error)
1203 /*
1204 * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could
1205 * lead us to mistake a negative return value as a failed syscall. Those syscall
1206 * must deposit a non-zero value in pt_regs.r8 to indicate an error. If
1207 * pt_regs.r8 is zero, we assume that the call completed successfully.
1208 */
1209 PT_REGS_UNWIND_INFO(0)
1210 ld8 r3=[r2] // load pt_regs.r8
1211 ;;
1212 cmp.eq p6,p7=r3,r0 // is pt_regs.r8==0?
1213 ;;
1214 (p7) mov r10=-1
1215 (p7) sub r8=0,r8 // negate return value to get errno
1216 br.cond.sptk ia64_leave_syscall
1217 END(handle_syscall_error)
1219 /*
1220 * Invoke schedule_tail(task) while preserving in0-in7, which may be needed
1221 * in case a system call gets restarted.
1222 */
1223 GLOBAL_ENTRY(ia64_invoke_schedule_tail)
1224 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
1225 alloc loc1=ar.pfs,8,2,1,0
1226 mov loc0=rp
1227 mov out0=r8 // Address of previous task
1228 ;;
1229 br.call.sptk.many rp=schedule_tail
1230 .ret11: mov ar.pfs=loc1
1231 mov rp=loc0
1232 br.ret.sptk.many rp
1233 END(ia64_invoke_schedule_tail)
1235 /*
1236 * Setup stack and call do_notify_resume_user(), keeping interrupts
1237 * disabled.
1238 *
1239 * Note that pSys and pNonSys need to be set up by the caller.
1240 * We declare 8 input registers so the system call args get preserved,
1241 * in case we need to restart a system call.
1242 */
1243 GLOBAL_ENTRY(notify_resume_user)
1244 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
1245 alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
1246 mov r9=ar.unat
1247 mov loc0=rp // save return address
1248 mov out0=0 // there is no "oldset"
1249 adds out1=8,sp // out1=&sigscratch->ar_pfs
1250 (pSys) mov out2=1 // out2==1 => we're in a syscall
1251 ;;
1252 (pNonSys) mov out2=0 // out2==0 => not a syscall
1253 .fframe 16
1254 .spillsp ar.unat, 16
1255 st8 [sp]=r9,-16 // allocate space for ar.unat and save it
1256 st8 [out1]=loc1,-8 // save ar.pfs, out1=&sigscratch
1257 .body
1258 br.call.sptk.many rp=do_notify_resume_user
1259 .ret15: .restore sp
1260 adds sp=16,sp // pop scratch stack space
1261 ;;
1262 ld8 r9=[sp] // load new unat from sigscratch->scratch_unat
1263 mov rp=loc0
1264 ;;
1265 mov ar.unat=r9
1266 mov ar.pfs=loc1
1267 br.ret.sptk.many rp
1268 END(notify_resume_user)
1270 ENTRY(sys_rt_sigreturn)
1271 PT_REGS_UNWIND_INFO(0)
1272 /*
1273 * Allocate 8 input registers since ptrace() may clobber them
1274 */
1275 alloc r2=ar.pfs,8,0,1,0
1276 .prologue
1277 PT_REGS_SAVES(16)
1278 adds sp=-16,sp
1279 .body
1280 cmp.eq pNonSys,pSys=r0,r0 // sigreturn isn't a normal syscall...
1281 ;;
1282 /*
1283 * leave_kernel() restores f6-f11 from pt_regs, but since the streamlined
1284 * syscall-entry path does not save them we save them here instead. Note: we
1285 * don't need to save any other registers that are not saved by the stream-lined
1286 * syscall path, because restore_sigcontext() restores them.
1287 */
1288 adds r16=PT(F6)+32,sp
1289 adds r17=PT(F7)+32,sp
1290 ;;
1291 stf.spill [r16]=f6,32
1292 stf.spill [r17]=f7,32
1293 ;;
1294 stf.spill [r16]=f8,32
1295 stf.spill [r17]=f9,32
1296 ;;
1297 stf.spill [r16]=f10
1298 stf.spill [r17]=f11
1299 adds out0=16,sp // out0 = &sigscratch
1300 br.call.sptk.many rp=ia64_rt_sigreturn
1301 .ret19: .restore sp,0
1302 adds sp=16,sp
1303 ;;
1304 ld8 r9=[sp] // load new ar.unat
1305 mov.sptk b7=r8,ia64_native_leave_kernel
1306 ;;
1307 mov ar.unat=r9
1308 br.many b7
1309 END(sys_rt_sigreturn)
1311 GLOBAL_ENTRY(ia64_prepare_handle_unaligned)
1312 .prologue
1313 /*
1314 * r16 = fake ar.pfs, we simply need to make sure privilege is still 0
1315 */
1316 mov r16=r0
1317 DO_SAVE_SWITCH_STACK
1318 br.call.sptk.many rp=ia64_handle_unaligned // stack frame setup in ivt
1319 .ret21: .body
1320 DO_LOAD_SWITCH_STACK
1321 br.cond.sptk.many rp // goes to ia64_leave_kernel
1322 END(ia64_prepare_handle_unaligned)
1324 //
1325 // unw_init_running(void (*callback)(info, arg), void *arg)
1326 //
1327 # define EXTRA_FRAME_SIZE ((UNW_FRAME_INFO_SIZE+15)&~15)
1329 GLOBAL_ENTRY(unw_init_running)
1330 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
1331 alloc loc1=ar.pfs,2,3,3,0
1332 ;;
1333 ld8 loc2=[in0],8
1334 mov loc0=rp
1335 mov r16=loc1
1336 DO_SAVE_SWITCH_STACK
1337 .body
1339 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
1340 .fframe IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE
1341 SWITCH_STACK_SAVES(EXTRA_FRAME_SIZE)
1342 adds sp=-EXTRA_FRAME_SIZE,sp
1343 .body
1344 ;;
1345 adds out0=16,sp // &info
1346 mov out1=r13 // current
1347 adds out2=16+EXTRA_FRAME_SIZE,sp // &switch_stack
1348 br.call.sptk.many rp=unw_init_frame_info
1349 1: adds out0=16,sp // &info
1350 mov b6=loc2
1351 mov loc2=gp // save gp across indirect function call
1352 ;;
1353 ld8 gp=[in0]
1354 mov out1=in1 // arg
1355 br.call.sptk.many rp=b6 // invoke the callback function
1356 1: mov gp=loc2 // restore gp
1358 // For now, we don't allow changing registers from within
1359 // unw_init_running; if we ever want to allow that, we'd
1360 // have to do a load_switch_stack here:
1361 .restore sp
1362 adds sp=IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE,sp
1364 mov ar.pfs=loc1
1365 mov rp=loc0
1366 br.ret.sptk.many rp
1367 END(unw_init_running)
1369 #ifdef CONFIG_FUNCTION_TRACER
1370 #ifdef CONFIG_DYNAMIC_FTRACE
1371 GLOBAL_ENTRY(_mcount)
1372 br ftrace_stub
1373 END(_mcount)
1375 .here:
1376 br.ret.sptk.many b0
1378 GLOBAL_ENTRY(ftrace_caller)
1379 alloc out0 = ar.pfs, 8, 0, 4, 0
1380 mov out3 = r0
1381 ;;
1382 mov out2 = b0
1383 add r3 = 0x20, r3
1384 mov out1 = r1;
1385 br.call.sptk.many b0 = ftrace_patch_gp
1386 //this might be called from module, so we must patch gp
1387 ftrace_patch_gp:
1388 movl gp=__gp
1389 mov b0 = r3
1390 ;;
1391 .global ftrace_call;
1392 ftrace_call:
1393 {
1394 .mlx
1395 nop.m 0x0
1396 movl r3 = .here;;
1397 }
1398 alloc loc0 = ar.pfs, 4, 4, 2, 0
1399 ;;
1400 mov loc1 = b0
1401 mov out0 = b0
1402 mov loc2 = r8
1403 mov loc3 = r15
1404 ;;
1405 adds out0 = -MCOUNT_INSN_SIZE, out0
1406 mov out1 = in2
1407 mov b6 = r3
1409 br.call.sptk.many b0 = b6
1410 ;;
1411 mov ar.pfs = loc0
1412 mov b0 = loc1
1413 mov r8 = loc2
1414 mov r15 = loc3
1415 br ftrace_stub
1416 ;;
1417 END(ftrace_caller)
1419 #else
1420 GLOBAL_ENTRY(_mcount)
1421 movl r2 = ftrace_stub
1422 movl r3 = ftrace_trace_function;;
1423 ld8 r3 = [r3];;
1424 ld8 r3 = [r3];;
1425 cmp.eq p7,p0 = r2, r3
1426 (p7) br.sptk.many ftrace_stub
1427 ;;
1429 alloc loc0 = ar.pfs, 4, 4, 2, 0
1430 ;;
1431 mov loc1 = b0
1432 mov out0 = b0
1433 mov loc2 = r8
1434 mov loc3 = r15
1435 ;;
1436 adds out0 = -MCOUNT_INSN_SIZE, out0
1437 mov out1 = in2
1438 mov b6 = r3
1440 br.call.sptk.many b0 = b6
1441 ;;
1442 mov ar.pfs = loc0
1443 mov b0 = loc1
1444 mov r8 = loc2
1445 mov r15 = loc3
1446 br ftrace_stub
1447 ;;
1448 END(_mcount)
1449 #endif
1451 GLOBAL_ENTRY(ftrace_stub)
1452 mov r3 = b0
1453 movl r2 = _mcount_ret_helper
1454 ;;
1455 mov b6 = r2
1456 mov b7 = r3
1457 br.ret.sptk.many b6
1459 _mcount_ret_helper:
1460 mov b0 = r42
1461 mov r1 = r41
1462 mov ar.pfs = r40
1463 br b7
1464 END(ftrace_stub)
1466 #endif /* CONFIG_FUNCTION_TRACER */
1468 .rodata
1469 .align 8
1470 .globl sys_call_table
1471 sys_call_table:
1472 data8 sys_ni_syscall // This must be sys_ni_syscall! See ivt.S.
1473 data8 sys_exit // 1025
1474 data8 sys_read
1475 data8 sys_write
1476 data8 sys_open
1477 data8 sys_close
1478 data8 sys_creat // 1030
1479 data8 sys_link
1480 data8 sys_unlink
1481 data8 ia64_execve
1482 data8 sys_chdir
1483 data8 sys_fchdir // 1035
1484 data8 sys_utimes
1485 data8 sys_mknod
1486 data8 sys_chmod
1487 data8 sys_chown
1488 data8 sys_lseek // 1040
1489 data8 sys_getpid
1490 data8 sys_getppid
1491 data8 sys_mount
1492 data8 sys_umount
1493 data8 sys_setuid // 1045
1494 data8 sys_getuid
1495 data8 sys_geteuid
1496 data8 sys_ptrace
1497 data8 sys_access
1498 data8 sys_sync // 1050
1499 data8 sys_fsync
1500 data8 sys_fdatasync
1501 data8 sys_kill
1502 data8 sys_rename
1503 data8 sys_mkdir // 1055
1504 data8 sys_rmdir
1505 data8 sys_dup
1506 data8 sys_ia64_pipe
1507 data8 sys_times
1508 data8 ia64_brk // 1060
1509 data8 sys_setgid
1510 data8 sys_getgid
1511 data8 sys_getegid
1512 data8 sys_acct
1513 data8 sys_ioctl // 1065
1514 data8 sys_fcntl
1515 data8 sys_umask
1516 data8 sys_chroot
1517 data8 sys_ustat
1518 data8 sys_dup2 // 1070
1519 data8 sys_setreuid
1520 data8 sys_setregid
1521 data8 sys_getresuid
1522 data8 sys_setresuid
1523 data8 sys_getresgid // 1075
1524 data8 sys_setresgid
1525 data8 sys_getgroups
1526 data8 sys_setgroups
1527 data8 sys_getpgid
1528 data8 sys_setpgid // 1080
1529 data8 sys_setsid
1530 data8 sys_getsid
1531 data8 sys_sethostname
1532 data8 sys_setrlimit
1533 data8 sys_getrlimit // 1085
1534 data8 sys_getrusage
1535 data8 sys_gettimeofday
1536 data8 sys_settimeofday
1537 data8 sys_select
1538 data8 sys_poll // 1090
1539 data8 sys_symlink
1540 data8 sys_readlink
1541 data8 sys_uselib
1542 data8 sys_swapon
1543 data8 sys_swapoff // 1095
1544 data8 sys_reboot
1545 data8 sys_truncate
1546 data8 sys_ftruncate
1547 data8 sys_fchmod
1548 data8 sys_fchown // 1100
1549 data8 ia64_getpriority
1550 data8 sys_setpriority
1551 data8 sys_statfs
1552 data8 sys_fstatfs
1553 data8 sys_gettid // 1105
1554 data8 sys_semget
1555 data8 sys_semop
1556 data8 sys_semctl
1557 data8 sys_msgget
1558 data8 sys_msgsnd // 1110
1559 data8 sys_msgrcv
1560 data8 sys_msgctl
1561 data8 sys_shmget
1562 data8 sys_shmat
1563 data8 sys_shmdt // 1115
1564 data8 sys_shmctl
1565 data8 sys_syslog
1566 data8 sys_setitimer
1567 data8 sys_getitimer
1568 data8 sys_ni_syscall // 1120 /* was: ia64_oldstat */
1569 data8 sys_ni_syscall /* was: ia64_oldlstat */
1570 data8 sys_ni_syscall /* was: ia64_oldfstat */
1571 data8 sys_vhangup
1572 data8 sys_lchown
1573 data8 sys_remap_file_pages // 1125
1574 data8 sys_wait4
1575 data8 sys_sysinfo
1576 data8 sys_clone
1577 data8 sys_setdomainname
1578 data8 sys_newuname // 1130
1579 data8 sys_adjtimex
1580 data8 sys_ni_syscall /* was: ia64_create_module */
1581 data8 sys_init_module
1582 data8 sys_delete_module
1583 data8 sys_ni_syscall // 1135 /* was: sys_get_kernel_syms */
1584 data8 sys_ni_syscall /* was: sys_query_module */
1585 data8 sys_quotactl
1586 data8 sys_bdflush
1587 data8 sys_sysfs
1588 data8 sys_personality // 1140
1589 data8 sys_ni_syscall // sys_afs_syscall
1590 data8 sys_setfsuid
1591 data8 sys_setfsgid
1592 data8 sys_getdents
1593 data8 sys_flock // 1145
1594 data8 sys_readv
1595 data8 sys_writev
1596 data8 sys_pread64
1597 data8 sys_pwrite64
1598 data8 sys_sysctl // 1150
1599 data8 sys_mmap
1600 data8 sys_munmap
1601 data8 sys_mlock
1602 data8 sys_mlockall
1603 data8 sys_mprotect // 1155
1604 data8 ia64_mremap
1605 data8 sys_msync
1606 data8 sys_munlock
1607 data8 sys_munlockall
1608 data8 sys_sched_getparam // 1160
1609 data8 sys_sched_setparam
1610 data8 sys_sched_getscheduler
1611 data8 sys_sched_setscheduler
1612 data8 sys_sched_yield
1613 data8 sys_sched_get_priority_max // 1165
1614 data8 sys_sched_get_priority_min
1615 data8 sys_sched_rr_get_interval
1616 data8 sys_nanosleep
1617 data8 sys_nfsservctl
1618 data8 sys_prctl // 1170
1619 data8 sys_getpagesize
1620 data8 sys_mmap2
1621 data8 sys_pciconfig_read
1622 data8 sys_pciconfig_write
1623 data8 sys_perfmonctl // 1175
1624 data8 sys_sigaltstack
1625 data8 sys_rt_sigaction
1626 data8 sys_rt_sigpending
1627 data8 sys_rt_sigprocmask
1628 data8 sys_rt_sigqueueinfo // 1180
1629 data8 sys_rt_sigreturn
1630 data8 sys_rt_sigsuspend
1631 data8 sys_rt_sigtimedwait
1632 data8 sys_getcwd
1633 data8 sys_capget // 1185
1634 data8 sys_capset
1635 data8 sys_sendfile64
1636 data8 sys_ni_syscall // sys_getpmsg (STREAMS)
1637 data8 sys_ni_syscall // sys_putpmsg (STREAMS)
1638 data8 sys_socket // 1190
1639 data8 sys_bind
1640 data8 sys_connect
1641 data8 sys_listen
1642 data8 sys_accept
1643 data8 sys_getsockname // 1195
1644 data8 sys_getpeername
1645 data8 sys_socketpair
1646 data8 sys_send
1647 data8 sys_sendto
1648 data8 sys_recv // 1200
1649 data8 sys_recvfrom
1650 data8 sys_shutdown
1651 data8 sys_setsockopt
1652 data8 sys_getsockopt
1653 data8 sys_sendmsg // 1205
1654 data8 sys_recvmsg
1655 data8 sys_pivot_root
1656 data8 sys_mincore
1657 data8 sys_madvise
1658 data8 sys_newstat // 1210
1659 data8 sys_newlstat
1660 data8 sys_newfstat
1661 data8 sys_clone2
1662 data8 sys_getdents64
1663 data8 sys_getunwind // 1215
1664 data8 sys_readahead
1665 data8 sys_setxattr
1666 data8 sys_lsetxattr
1667 data8 sys_fsetxattr
1668 data8 sys_getxattr // 1220
1669 data8 sys_lgetxattr
1670 data8 sys_fgetxattr
1671 data8 sys_listxattr
1672 data8 sys_llistxattr
1673 data8 sys_flistxattr // 1225
1674 data8 sys_removexattr
1675 data8 sys_lremovexattr
1676 data8 sys_fremovexattr
1677 data8 sys_tkill
1678 data8 sys_futex // 1230
1679 data8 sys_sched_setaffinity
1680 data8 sys_sched_getaffinity
1681 data8 sys_set_tid_address
1682 data8 sys_fadvise64_64
1683 data8 sys_tgkill // 1235
1684 data8 sys_exit_group
1685 data8 sys_lookup_dcookie
1686 data8 sys_io_setup
1687 data8 sys_io_destroy
1688 data8 sys_io_getevents // 1240
1689 data8 sys_io_submit
1690 data8 sys_io_cancel
1691 data8 sys_epoll_create
1692 data8 sys_epoll_ctl
1693 data8 sys_epoll_wait // 1245
1694 data8 sys_restart_syscall
1695 data8 sys_semtimedop
1696 data8 sys_timer_create
1697 data8 sys_timer_settime
1698 data8 sys_timer_gettime // 1250
1699 data8 sys_timer_getoverrun
1700 data8 sys_timer_delete
1701 data8 sys_clock_settime
1702 data8 sys_clock_gettime
1703 data8 sys_clock_getres // 1255
1704 data8 sys_clock_nanosleep
1705 data8 sys_fstatfs64
1706 data8 sys_statfs64
1707 data8 sys_mbind
1708 data8 sys_get_mempolicy // 1260
1709 data8 sys_set_mempolicy
1710 data8 sys_mq_open
1711 data8 sys_mq_unlink
1712 data8 sys_mq_timedsend
1713 data8 sys_mq_timedreceive // 1265
1714 data8 sys_mq_notify
1715 data8 sys_mq_getsetattr
1716 data8 sys_kexec_load
1717 data8 sys_ni_syscall // reserved for vserver
1718 data8 sys_waitid // 1270
1719 data8 sys_add_key
1720 data8 sys_request_key
1721 data8 sys_keyctl
1722 data8 sys_ioprio_set
1723 data8 sys_ioprio_get // 1275
1724 data8 sys_move_pages
1725 data8 sys_inotify_init
1726 data8 sys_inotify_add_watch
1727 data8 sys_inotify_rm_watch
1728 data8 sys_migrate_pages // 1280
1729 data8 sys_openat
1730 data8 sys_mkdirat
1731 data8 sys_mknodat
1732 data8 sys_fchownat
1733 data8 sys_futimesat // 1285
1734 data8 sys_newfstatat
1735 data8 sys_unlinkat
1736 data8 sys_renameat
1737 data8 sys_linkat
1738 data8 sys_symlinkat // 1290
1739 data8 sys_readlinkat
1740 data8 sys_fchmodat
1741 data8 sys_faccessat
1742 data8 sys_pselect6
1743 data8 sys_ppoll // 1295
1744 data8 sys_unshare
1745 data8 sys_splice
1746 data8 sys_set_robust_list
1747 data8 sys_get_robust_list
1748 data8 sys_sync_file_range // 1300
1749 data8 sys_tee
1750 data8 sys_vmsplice
1751 data8 sys_fallocate
1752 data8 sys_getcpu
1753 data8 sys_epoll_pwait // 1305
1754 data8 sys_utimensat
1755 data8 sys_signalfd
1756 data8 sys_ni_syscall
1757 data8 sys_eventfd
1758 data8 sys_timerfd_create // 1310
1759 data8 sys_timerfd_settime
1760 data8 sys_timerfd_gettime
1761 data8 sys_signalfd4
1762 data8 sys_eventfd2
1763 data8 sys_epoll_create1 // 1315
1764 data8 sys_dup3
1765 data8 sys_pipe2
1766 data8 sys_inotify_init1
1767 data8 sys_preadv
1768 data8 sys_pwritev // 1320
1769 data8 sys_rt_tgsigqueueinfo
1770 data8 sys_recvmmsg
1772 .org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls
1773 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */