| blob | 95f517515235ef1612d35f1eb635c407c0a7dad7 |
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 * Global (preserved) predicate usage on syscall entry/exit path:
27 *
28 * pKStk: See entry.h.
29 * pUStk: See entry.h.
30 * pSys: See entry.h.
31 * pNonSys: !pSys
32 */
35 #include <asm/asmmacro.h>
36 #include <asm/cache.h>
37 #include <asm/errno.h>
38 #include <asm/kregs.h>
39 #include <asm/asm-offsets.h>
40 #include <asm/pgtable.h>
41 #include <asm/percpu.h>
42 #include <asm/processor.h>
43 #include <asm/thread_info.h>
44 #include <asm/unistd.h>
46 #include "minstate.h"
48 /*
49 * execve() is special because in case of success, we need to
50 * setup a null register window frame.
51 */
52 ENTRY(ia64_execve)
53 /*
54 * Allocate 8 input registers since ptrace() may clobber them
55 */
56 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
57 alloc loc1=ar.pfs,8,2,4,0
58 mov loc0=rp
59 .body
60 mov out0=in0 // filename
61 ;; // stop bit between alloc and call
62 mov out1=in1 // argv
63 mov out2=in2 // envp
64 add out3=16,sp // regs
65 br.call.sptk.many rp=sys_execve
66 .ret0:
67 #ifdef CONFIG_IA32_SUPPORT
68 /*
69 * Check if we're returning to ia32 mode. If so, we need to restore ia32 registers
70 * from pt_regs.
71 */
72 adds r16=PT(CR_IPSR)+16,sp
73 ;;
74 ld8 r16=[r16]
75 #endif
76 cmp4.ge p6,p7=r8,r0
77 mov ar.pfs=loc1 // restore ar.pfs
78 sxt4 r8=r8 // return 64-bit result
79 ;;
80 stf.spill [sp]=f0
81 (p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode...
82 mov rp=loc0
83 (p6) mov ar.pfs=r0 // clear ar.pfs on success
84 (p7) br.ret.sptk.many rp
86 /*
87 * In theory, we'd have to zap this state only to prevent leaking of
88 * security sensitive state (e.g., if current->mm->dumpable is zero). However,
89 * this executes in less than 20 cycles even on Itanium, so it's not worth
90 * optimizing for...).
91 */
92 mov ar.unat=0; mov ar.lc=0
93 mov r4=0; mov f2=f0; mov b1=r0
94 mov r5=0; mov f3=f0; mov b2=r0
95 mov r6=0; mov f4=f0; mov b3=r0
96 mov r7=0; mov f5=f0; mov b4=r0
97 ldf.fill f12=[sp]; mov f13=f0; mov b5=r0
98 ldf.fill f14=[sp]; ldf.fill f15=[sp]; mov f16=f0
99 ldf.fill f17=[sp]; ldf.fill f18=[sp]; mov f19=f0
100 ldf.fill f20=[sp]; ldf.fill f21=[sp]; mov f22=f0
101 ldf.fill f23=[sp]; ldf.fill f24=[sp]; mov f25=f0
102 ldf.fill f26=[sp]; ldf.fill f27=[sp]; mov f28=f0
103 ldf.fill f29=[sp]; ldf.fill f30=[sp]; mov f31=f0
104 #ifdef CONFIG_IA32_SUPPORT
105 tbit.nz p6,p0=r16, IA64_PSR_IS_BIT
106 movl loc0=ia64_ret_from_ia32_execve
107 ;;
108 (p6) mov rp=loc0
109 #endif
110 br.ret.sptk.many rp
111 END(ia64_execve)
113 /*
114 * sys_clone2(u64 flags, u64 ustack_base, u64 ustack_size, u64 parent_tidptr, u64 child_tidptr,
115 * u64 tls)
116 */
117 GLOBAL_ENTRY(sys_clone2)
118 /*
119 * Allocate 8 input registers since ptrace() may clobber them
120 */
121 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
122 alloc r16=ar.pfs,8,2,6,0
123 DO_SAVE_SWITCH_STACK
124 adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp
125 mov loc0=rp
126 mov loc1=r16 // save ar.pfs across do_fork
127 .body
128 mov out1=in1
129 mov out3=in2
130 tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
131 mov out4=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
132 ;;
133 (p6) st8 [r2]=in5 // store TLS in r16 for copy_thread()
134 mov out5=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
135 adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
136 mov out0=in0 // out0 = clone_flags
137 br.call.sptk.many rp=do_fork
138 .ret1: .restore sp
139 adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
140 mov ar.pfs=loc1
141 mov rp=loc0
142 br.ret.sptk.many rp
143 END(sys_clone2)
145 /*
146 * sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls)
147 * Deprecated. Use sys_clone2() instead.
148 */
149 GLOBAL_ENTRY(sys_clone)
150 /*
151 * Allocate 8 input registers since ptrace() may clobber them
152 */
153 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
154 alloc r16=ar.pfs,8,2,6,0
155 DO_SAVE_SWITCH_STACK
156 adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp
157 mov loc0=rp
158 mov loc1=r16 // save ar.pfs across do_fork
159 .body
160 mov out1=in1
161 mov out3=16 // stacksize (compensates for 16-byte scratch area)
162 tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
163 mov out4=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
164 ;;
165 (p6) st8 [r2]=in4 // store TLS in r13 (tp)
166 mov out5=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
167 adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
168 mov out0=in0 // out0 = clone_flags
169 br.call.sptk.many rp=do_fork
170 .ret2: .restore sp
171 adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
172 mov ar.pfs=loc1
173 mov rp=loc0
174 br.ret.sptk.many rp
175 END(sys_clone)
177 /*
178 * prev_task <- ia64_switch_to(struct task_struct *next)
179 * With Ingo's new scheduler, interrupts are disabled when this routine gets
180 * called. The code starting at .map relies on this. The rest of the code
181 * doesn't care about the interrupt masking status.
182 */
183 GLOBAL_ENTRY(ia64_switch_to)
184 .prologue
185 alloc r16=ar.pfs,1,0,0,0
186 DO_SAVE_SWITCH_STACK
187 .body
189 adds r22=IA64_TASK_THREAD_KSP_OFFSET,r13
190 movl r25=init_task
191 mov r27=IA64_KR(CURRENT_STACK)
192 adds r21=IA64_TASK_THREAD_KSP_OFFSET,in0
193 dep r20=0,in0,61,3 // physical address of "next"
194 ;;
195 st8 [r22]=sp // save kernel stack pointer of old task
196 shr.u r26=r20,IA64_GRANULE_SHIFT
197 cmp.eq p7,p6=r25,in0
198 ;;
199 /*
200 * If we've already mapped this task's page, we can skip doing it again.
201 */
202 (p6) cmp.eq p7,p6=r26,r27
203 (p6) br.cond.dpnt .map
204 ;;
205 .done:
206 ld8 sp=[r21] // load kernel stack pointer of new task
207 mov IA64_KR(CURRENT)=in0 // update "current" application register
208 mov r8=r13 // return pointer to previously running task
209 mov r13=in0 // set "current" pointer
210 ;;
211 DO_LOAD_SWITCH_STACK
213 #ifdef CONFIG_SMP
214 sync.i // ensure "fc"s done by this CPU are visible on other CPUs
215 #endif
216 br.ret.sptk.many rp // boogie on out in new context
218 .map:
219 rsm psr.ic // interrupts (psr.i) are already disabled here
220 movl r25=PAGE_KERNEL
221 ;;
222 srlz.d
223 or r23=r25,r20 // construct PA | page properties
224 mov r25=IA64_GRANULE_SHIFT<<2
225 ;;
226 mov cr.itir=r25
227 mov cr.ifa=in0 // VA of next task...
228 ;;
229 mov r25=IA64_TR_CURRENT_STACK
230 mov IA64_KR(CURRENT_STACK)=r26 // remember last page we mapped...
231 ;;
232 itr.d dtr[r25]=r23 // wire in new mapping...
233 ssm psr.ic // reenable the psr.ic bit
234 ;;
235 srlz.d
236 br.cond.sptk .done
237 END(ia64_switch_to)
239 /*
240 * Note that interrupts are enabled during save_switch_stack and load_switch_stack. This
241 * means that we may get an interrupt with "sp" pointing to the new kernel stack while
242 * ar.bspstore is still pointing to the old kernel backing store area. Since ar.rsc,
243 * ar.rnat, ar.bsp, and ar.bspstore are all preserved by interrupts, this is not a
244 * problem. Also, we don't need to specify unwind information for preserved registers
245 * that are not modified in save_switch_stack as the right unwind information is already
246 * specified at the call-site of save_switch_stack.
247 */
249 /*
250 * save_switch_stack:
251 * - r16 holds ar.pfs
252 * - b7 holds address to return to
253 * - rp (b0) holds return address to save
254 */
255 GLOBAL_ENTRY(save_switch_stack)
256 .prologue
257 .altrp b7
258 flushrs // flush dirty regs to backing store (must be first in insn group)
259 .save @priunat,r17
260 mov r17=ar.unat // preserve caller's
261 .body
262 #ifdef CONFIG_ITANIUM
263 adds r2=16+128,sp
264 adds r3=16+64,sp
265 adds r14=SW(R4)+16,sp
266 ;;
267 st8.spill [r14]=r4,16 // spill r4
268 lfetch.fault.excl.nt1 [r3],128
269 ;;
270 lfetch.fault.excl.nt1 [r2],128
271 lfetch.fault.excl.nt1 [r3],128
272 ;;
273 lfetch.fault.excl [r2]
274 lfetch.fault.excl [r3]
275 adds r15=SW(R5)+16,sp
276 #else
277 add r2=16+3*128,sp
278 add r3=16,sp
279 add r14=SW(R4)+16,sp
280 ;;
281 st8.spill [r14]=r4,SW(R6)-SW(R4) // spill r4 and prefetch offset 0x1c0
282 lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x010
283 ;;
284 lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x090
285 lfetch.fault.excl.nt1 [r2],128 // prefetch offset 0x190
286 ;;
287 lfetch.fault.excl.nt1 [r3] // prefetch offset 0x110
288 lfetch.fault.excl.nt1 [r2] // prefetch offset 0x210
289 adds r15=SW(R5)+16,sp
290 #endif
291 ;;
292 st8.spill [r15]=r5,SW(R7)-SW(R5) // spill r5
293 mov.m ar.rsc=0 // put RSE in mode: enforced lazy, little endian, pl 0
294 add r2=SW(F2)+16,sp // r2 = &sw->f2
295 ;;
296 st8.spill [r14]=r6,SW(B0)-SW(R6) // spill r6
297 mov.m r18=ar.fpsr // preserve fpsr
298 add r3=SW(F3)+16,sp // r3 = &sw->f3
299 ;;
300 stf.spill [r2]=f2,32
301 mov.m r19=ar.rnat
302 mov r21=b0
304 stf.spill [r3]=f3,32
305 st8.spill [r15]=r7,SW(B2)-SW(R7) // spill r7
306 mov r22=b1
307 ;;
308 // since we're done with the spills, read and save ar.unat:
309 mov.m r29=ar.unat
310 mov.m r20=ar.bspstore
311 mov r23=b2
312 stf.spill [r2]=f4,32
313 stf.spill [r3]=f5,32
314 mov r24=b3
315 ;;
316 st8 [r14]=r21,SW(B1)-SW(B0) // save b0
317 st8 [r15]=r23,SW(B3)-SW(B2) // save b2
318 mov r25=b4
319 mov r26=b5
320 ;;
321 st8 [r14]=r22,SW(B4)-SW(B1) // save b1
322 st8 [r15]=r24,SW(AR_PFS)-SW(B3) // save b3
323 mov r21=ar.lc // I-unit
324 stf.spill [r2]=f12,32
325 stf.spill [r3]=f13,32
326 ;;
327 st8 [r14]=r25,SW(B5)-SW(B4) // save b4
328 st8 [r15]=r16,SW(AR_LC)-SW(AR_PFS) // save ar.pfs
329 stf.spill [r2]=f14,32
330 stf.spill [r3]=f15,32
331 ;;
332 st8 [r14]=r26 // save b5
333 st8 [r15]=r21 // save ar.lc
334 stf.spill [r2]=f16,32
335 stf.spill [r3]=f17,32
336 ;;
337 stf.spill [r2]=f18,32
338 stf.spill [r3]=f19,32
339 ;;
340 stf.spill [r2]=f20,32
341 stf.spill [r3]=f21,32
342 ;;
343 stf.spill [r2]=f22,32
344 stf.spill [r3]=f23,32
345 ;;
346 stf.spill [r2]=f24,32
347 stf.spill [r3]=f25,32
348 ;;
349 stf.spill [r2]=f26,32
350 stf.spill [r3]=f27,32
351 ;;
352 stf.spill [r2]=f28,32
353 stf.spill [r3]=f29,32
354 ;;
355 stf.spill [r2]=f30,SW(AR_UNAT)-SW(F30)
356 stf.spill [r3]=f31,SW(PR)-SW(F31)
357 add r14=SW(CALLER_UNAT)+16,sp
358 ;;
359 st8 [r2]=r29,SW(AR_RNAT)-SW(AR_UNAT) // save ar.unat
360 st8 [r14]=r17,SW(AR_FPSR)-SW(CALLER_UNAT) // save caller_unat
361 mov r21=pr
362 ;;
363 st8 [r2]=r19,SW(AR_BSPSTORE)-SW(AR_RNAT) // save ar.rnat
364 st8 [r3]=r21 // save predicate registers
365 ;;
366 st8 [r2]=r20 // save ar.bspstore
367 st8 [r14]=r18 // save fpsr
368 mov ar.rsc=3 // put RSE back into eager mode, pl 0
369 br.cond.sptk.many b7
370 END(save_switch_stack)
372 /*
373 * load_switch_stack:
374 * - "invala" MUST be done at call site (normally in DO_LOAD_SWITCH_STACK)
375 * - b7 holds address to return to
376 * - must not touch r8-r11
377 */
378 ENTRY(load_switch_stack)
379 .prologue
380 .altrp b7
382 .body
383 lfetch.fault.nt1 [sp]
384 adds r2=SW(AR_BSPSTORE)+16,sp
385 adds r3=SW(AR_UNAT)+16,sp
386 mov ar.rsc=0 // put RSE into enforced lazy mode
387 adds r14=SW(CALLER_UNAT)+16,sp
388 adds r15=SW(AR_FPSR)+16,sp
389 ;;
390 ld8 r27=[r2],(SW(B0)-SW(AR_BSPSTORE)) // bspstore
391 ld8 r29=[r3],(SW(B1)-SW(AR_UNAT)) // unat
392 ;;
393 ld8 r21=[r2],16 // restore b0
394 ld8 r22=[r3],16 // restore b1
395 ;;
396 ld8 r23=[r2],16 // restore b2
397 ld8 r24=[r3],16 // restore b3
398 ;;
399 ld8 r25=[r2],16 // restore b4
400 ld8 r26=[r3],16 // restore b5
401 ;;
402 ld8 r16=[r2],(SW(PR)-SW(AR_PFS)) // ar.pfs
403 ld8 r17=[r3],(SW(AR_RNAT)-SW(AR_LC)) // ar.lc
404 ;;
405 ld8 r28=[r2] // restore pr
406 ld8 r30=[r3] // restore rnat
407 ;;
408 ld8 r18=[r14],16 // restore caller's unat
409 ld8 r19=[r15],24 // restore fpsr
410 ;;
411 ldf.fill f2=[r14],32
412 ldf.fill f3=[r15],32
413 ;;
414 ldf.fill f4=[r14],32
415 ldf.fill f5=[r15],32
416 ;;
417 ldf.fill f12=[r14],32
418 ldf.fill f13=[r15],32
419 ;;
420 ldf.fill f14=[r14],32
421 ldf.fill f15=[r15],32
422 ;;
423 ldf.fill f16=[r14],32
424 ldf.fill f17=[r15],32
425 ;;
426 ldf.fill f18=[r14],32
427 ldf.fill f19=[r15],32
428 mov b0=r21
429 ;;
430 ldf.fill f20=[r14],32
431 ldf.fill f21=[r15],32
432 mov b1=r22
433 ;;
434 ldf.fill f22=[r14],32
435 ldf.fill f23=[r15],32
436 mov b2=r23
437 ;;
438 mov ar.bspstore=r27
439 mov ar.unat=r29 // establish unat holding the NaT bits for r4-r7
440 mov b3=r24
441 ;;
442 ldf.fill f24=[r14],32
443 ldf.fill f25=[r15],32
444 mov b4=r25
445 ;;
446 ldf.fill f26=[r14],32
447 ldf.fill f27=[r15],32
448 mov b5=r26
449 ;;
450 ldf.fill f28=[r14],32
451 ldf.fill f29=[r15],32
452 mov ar.pfs=r16
453 ;;
454 ldf.fill f30=[r14],32
455 ldf.fill f31=[r15],24
456 mov ar.lc=r17
457 ;;
458 ld8.fill r4=[r14],16
459 ld8.fill r5=[r15],16
460 mov pr=r28,-1
461 ;;
462 ld8.fill r6=[r14],16
463 ld8.fill r7=[r15],16
465 mov ar.unat=r18 // restore caller's unat
466 mov ar.rnat=r30 // must restore after bspstore but before rsc!
467 mov ar.fpsr=r19 // restore fpsr
468 mov ar.rsc=3 // put RSE back into eager mode, pl 0
469 br.cond.sptk.many b7
470 END(load_switch_stack)
472 GLOBAL_ENTRY(prefetch_stack)
473 add r14 = -IA64_SWITCH_STACK_SIZE, sp
474 add r15 = IA64_TASK_THREAD_KSP_OFFSET, in0
475 ;;
476 ld8 r16 = [r15] // load next's stack pointer
477 lfetch.fault.excl [r14], 128
478 ;;
479 lfetch.fault.excl [r14], 128
480 lfetch.fault [r16], 128
481 ;;
482 lfetch.fault.excl [r14], 128
483 lfetch.fault [r16], 128
484 ;;
485 lfetch.fault.excl [r14], 128
486 lfetch.fault [r16], 128
487 ;;
488 lfetch.fault.excl [r14], 128
489 lfetch.fault [r16], 128
490 ;;
491 lfetch.fault [r16], 128
492 br.ret.sptk.many rp
493 END(prefetch_stack)
495 GLOBAL_ENTRY(kernel_execve)
496 mov r15=__NR_execve // put syscall number in place
497 break __BREAK_SYSCALL
498 br.ret.sptk.many rp
499 END(kernel_execve)
501 GLOBAL_ENTRY(clone)
502 mov r15=__NR_clone // put syscall number in place
503 break __BREAK_SYSCALL
504 br.ret.sptk.many rp
505 END(clone)
507 /*
508 * Invoke a system call, but do some tracing before and after the call.
509 * We MUST preserve the current register frame throughout this routine
510 * because some system calls (such as ia64_execve) directly
511 * manipulate ar.pfs.
512 */
513 GLOBAL_ENTRY(ia64_trace_syscall)
514 PT_REGS_UNWIND_INFO(0)
515 /*
516 * We need to preserve the scratch registers f6-f11 in case the system
517 * call is sigreturn.
518 */
519 adds r16=PT(F6)+16,sp
520 adds r17=PT(F7)+16,sp
521 ;;
522 stf.spill [r16]=f6,32
523 stf.spill [r17]=f7,32
524 ;;
525 stf.spill [r16]=f8,32
526 stf.spill [r17]=f9,32
527 ;;
528 stf.spill [r16]=f10
529 stf.spill [r17]=f11
530 br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
531 adds r16=PT(F6)+16,sp
532 adds r17=PT(F7)+16,sp
533 ;;
534 ldf.fill f6=[r16],32
535 ldf.fill f7=[r17],32
536 ;;
537 ldf.fill f8=[r16],32
538 ldf.fill f9=[r17],32
539 ;;
540 ldf.fill f10=[r16]
541 ldf.fill f11=[r17]
542 // the syscall number may have changed, so re-load it and re-calculate the
543 // syscall entry-point:
544 adds r15=PT(R15)+16,sp // r15 = &pt_regs.r15 (syscall #)
545 ;;
546 ld8 r15=[r15]
547 mov r3=NR_syscalls - 1
548 ;;
549 adds r15=-1024,r15
550 movl r16=sys_call_table
551 ;;
552 shladd r20=r15,3,r16 // r20 = sys_call_table + 8*(syscall-1024)
553 cmp.leu p6,p7=r15,r3
554 ;;
555 (p6) ld8 r20=[r20] // load address of syscall entry point
556 (p7) movl r20=sys_ni_syscall
557 ;;
558 mov b6=r20
559 br.call.sptk.many rp=b6 // do the syscall
560 .strace_check_retval:
561 cmp.lt p6,p0=r8,r0 // syscall failed?
562 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
563 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
564 mov r10=0
565 (p6) br.cond.sptk strace_error // syscall failed ->
566 ;; // avoid RAW on r10
567 .strace_save_retval:
568 .mem.offset 0,0; st8.spill [r2]=r8 // store return value in slot for r8
569 .mem.offset 8,0; st8.spill [r3]=r10 // clear error indication in slot for r10
570 br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
571 .ret3:
572 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
573 br.cond.sptk .work_pending_syscall_end
575 strace_error:
576 ld8 r3=[r2] // load pt_regs.r8
577 sub r9=0,r8 // negate return value to get errno value
578 ;;
579 cmp.ne p6,p0=r3,r0 // is pt_regs.r8!=0?
580 adds r3=16,r2 // r3=&pt_regs.r10
581 ;;
582 (p6) mov r10=-1
583 (p6) mov r8=r9
584 br.cond.sptk .strace_save_retval
585 END(ia64_trace_syscall)
587 /*
588 * When traced and returning from sigreturn, we invoke syscall_trace but then
589 * go straight to ia64_leave_kernel rather than ia64_leave_syscall.
590 */
591 GLOBAL_ENTRY(ia64_strace_leave_kernel)
592 PT_REGS_UNWIND_INFO(0)
593 { /*
594 * Some versions of gas generate bad unwind info if the first instruction of a
595 * procedure doesn't go into the first slot of a bundle. This is a workaround.
596 */
597 nop.m 0
598 nop.i 0
599 br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
600 }
601 .ret4: br.cond.sptk ia64_leave_kernel
602 END(ia64_strace_leave_kernel)
604 GLOBAL_ENTRY(ia64_ret_from_clone)
605 PT_REGS_UNWIND_INFO(0)
606 { /*
607 * Some versions of gas generate bad unwind info if the first instruction of a
608 * procedure doesn't go into the first slot of a bundle. This is a workaround.
609 */
610 nop.m 0
611 nop.i 0
612 /*
613 * We need to call schedule_tail() to complete the scheduling process.
614 * Called by ia64_switch_to() after do_fork()->copy_thread(). r8 contains the
615 * address of the previously executing task.
616 */
617 br.call.sptk.many rp=ia64_invoke_schedule_tail
618 }
619 .ret8:
620 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
621 ;;
622 ld4 r2=[r2]
623 ;;
624 mov r8=0
625 and r2=_TIF_SYSCALL_TRACEAUDIT,r2
626 ;;
627 cmp.ne p6,p0=r2,r0
628 (p6) br.cond.spnt .strace_check_retval
629 ;; // added stop bits to prevent r8 dependency
630 END(ia64_ret_from_clone)
631 // fall through
632 GLOBAL_ENTRY(ia64_ret_from_syscall)
633 PT_REGS_UNWIND_INFO(0)
634 cmp.ge p6,p7=r8,r0 // syscall executed successfully?
635 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
636 mov r10=r0 // clear error indication in r10
637 (p7) br.cond.spnt handle_syscall_error // handle potential syscall failure
638 END(ia64_ret_from_syscall)
639 // fall through
640 /*
641 * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
642 * need to switch to bank 0 and doesn't restore the scratch registers.
643 * To avoid leaking kernel bits, the scratch registers are set to
644 * the following known-to-be-safe values:
645 *
646 * r1: restored (global pointer)
647 * r2: cleared
648 * r3: 1 (when returning to user-level)
649 * r8-r11: restored (syscall return value(s))
650 * r12: restored (user-level stack pointer)
651 * r13: restored (user-level thread pointer)
652 * r14: set to __kernel_syscall_via_epc
653 * r15: restored (syscall #)
654 * r16-r17: cleared
655 * r18: user-level b6
656 * r19: cleared
657 * r20: user-level ar.fpsr
658 * r21: user-level b0
659 * r22: cleared
660 * r23: user-level ar.bspstore
661 * r24: user-level ar.rnat
662 * r25: user-level ar.unat
663 * r26: user-level ar.pfs
664 * r27: user-level ar.rsc
665 * r28: user-level ip
666 * r29: user-level psr
667 * r30: user-level cfm
668 * r31: user-level pr
669 * f6-f11: cleared
670 * pr: restored (user-level pr)
671 * b0: restored (user-level rp)
672 * b6: restored
673 * b7: set to __kernel_syscall_via_epc
674 * ar.unat: restored (user-level ar.unat)
675 * ar.pfs: restored (user-level ar.pfs)
676 * ar.rsc: restored (user-level ar.rsc)
677 * ar.rnat: restored (user-level ar.rnat)
678 * ar.bspstore: restored (user-level ar.bspstore)
679 * ar.fpsr: restored (user-level ar.fpsr)
680 * ar.ccv: cleared
681 * ar.csd: cleared
682 * ar.ssd: cleared
683 */
684 ENTRY(ia64_leave_syscall)
685 PT_REGS_UNWIND_INFO(0)
686 /*
687 * work.need_resched etc. mustn't get changed by this CPU before it returns to
688 * user- or fsys-mode, hence we disable interrupts early on.
689 *
690 * p6 controls whether current_thread_info()->flags needs to be check for
691 * extra work. We always check for extra work when returning to user-level.
692 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
693 * is 0. After extra work processing has been completed, execution
694 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
695 * needs to be redone.
696 */
697 #ifdef CONFIG_PREEMPT
698 rsm psr.i // disable interrupts
699 cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
700 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
701 ;;
702 .pred.rel.mutex pUStk,pKStk
703 (pKStk) ld4 r21=[r20] // r21 <- preempt_count
704 (pUStk) mov r21=0 // r21 <- 0
705 ;;
706 cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
707 #else /* !CONFIG_PREEMPT */
708 (pUStk) rsm psr.i
709 cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
710 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
711 #endif
712 .work_processed_syscall:
713 adds r2=PT(LOADRS)+16,r12
714 adds r3=PT(AR_BSPSTORE)+16,r12
715 adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
716 ;;
717 (p6) ld4 r31=[r18] // load current_thread_info()->flags
718 ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
719 nop.i 0
720 ;;
721 mov r16=ar.bsp // M2 get existing backing store pointer
722 ld8 r18=[r2],PT(R9)-PT(B6) // load b6
723 (p6) and r15=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
724 ;;
725 ld8 r23=[r3],PT(R11)-PT(AR_BSPSTORE) // load ar.bspstore (may be garbage)
726 (p6) cmp4.ne.unc p6,p0=r15, r0 // any special work pending?
727 (p6) br.cond.spnt .work_pending_syscall
728 ;;
729 // start restoring the state saved on the kernel stack (struct pt_regs):
730 ld8 r9=[r2],PT(CR_IPSR)-PT(R9)
731 ld8 r11=[r3],PT(CR_IIP)-PT(R11)
732 (pNonSys) break 0 // bug check: we shouldn't be here if pNonSys is TRUE!
733 ;;
734 invala // M0|1 invalidate ALAT
735 rsm psr.i | psr.ic // M2 turn off interrupts and interruption collection
736 cmp.eq p9,p0=r0,r0 // A set p9 to indicate that we should restore cr.ifs
738 ld8 r29=[r2],16 // M0|1 load cr.ipsr
739 ld8 r28=[r3],16 // M0|1 load cr.iip
740 mov r22=r0 // A clear r22
741 ;;
742 ld8 r30=[r2],16 // M0|1 load cr.ifs
743 ld8 r25=[r3],16 // M0|1 load ar.unat
744 (pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
745 ;;
746 ld8 r26=[r2],PT(B0)-PT(AR_PFS) // M0|1 load ar.pfs
747 (pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled
748 nop 0
749 ;;
750 ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
751 ld8 r27=[r3],PT(PR)-PT(AR_RSC) // M0|1 load ar.rsc
752 mov f6=f0 // F clear f6
753 ;;
754 ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT) // M0|1 load ar.rnat (may be garbage)
755 ld8 r31=[r3],PT(R1)-PT(PR) // M0|1 load predicates
756 mov f7=f0 // F clear f7
757 ;;
758 ld8 r20=[r2],PT(R12)-PT(AR_FPSR) // M0|1 load ar.fpsr
759 ld8.fill r1=[r3],16 // M0|1 load r1
760 (pUStk) mov r17=1 // A
761 ;;
762 (pUStk) st1 [r14]=r17 // M2|3
763 ld8.fill r13=[r3],16 // M0|1
764 mov f8=f0 // F clear f8
765 ;;
766 ld8.fill r12=[r2] // M0|1 restore r12 (sp)
767 ld8.fill r15=[r3] // M0|1 restore r15
768 mov b6=r18 // I0 restore b6
770 LOAD_PHYS_STACK_REG_SIZE(r17)
771 mov f9=f0 // F clear f9
772 (pKStk) br.cond.dpnt.many skip_rbs_switch // B
774 srlz.d // M0 ensure interruption collection is off (for cover)
775 shr.u r18=r19,16 // I0|1 get byte size of existing "dirty" partition
776 cover // B add current frame into dirty partition & set cr.ifs
777 ;;
778 mov r19=ar.bsp // M2 get new backing store pointer
779 mov f10=f0 // F clear f10
781 nop.m 0
782 movl r14=__kernel_syscall_via_epc // X
783 ;;
784 mov.m ar.csd=r0 // M2 clear ar.csd
785 mov.m ar.ccv=r0 // M2 clear ar.ccv
786 mov b7=r14 // I0 clear b7 (hint with __kernel_syscall_via_epc)
788 mov.m ar.ssd=r0 // M2 clear ar.ssd
789 mov f11=f0 // F clear f11
790 br.cond.sptk.many rbs_switch // B
791 END(ia64_leave_syscall)
793 #ifdef CONFIG_IA32_SUPPORT
794 GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
795 PT_REGS_UNWIND_INFO(0)
796 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
797 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
798 ;;
799 .mem.offset 0,0
800 st8.spill [r2]=r8 // store return value in slot for r8 and set unat bit
801 .mem.offset 8,0
802 st8.spill [r3]=r0 // clear error indication in slot for r10 and set unat bit
803 END(ia64_ret_from_ia32_execve)
804 // fall through
805 #endif /* CONFIG_IA32_SUPPORT */
806 GLOBAL_ENTRY(ia64_leave_kernel)
807 PT_REGS_UNWIND_INFO(0)
808 /*
809 * work.need_resched etc. mustn't get changed by this CPU before it returns to
810 * user- or fsys-mode, hence we disable interrupts early on.
811 *
812 * p6 controls whether current_thread_info()->flags needs to be check for
813 * extra work. We always check for extra work when returning to user-level.
814 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
815 * is 0. After extra work processing has been completed, execution
816 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
817 * needs to be redone.
818 */
819 #ifdef CONFIG_PREEMPT
820 rsm psr.i // disable interrupts
821 cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
822 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
823 ;;
824 .pred.rel.mutex pUStk,pKStk
825 (pKStk) ld4 r21=[r20] // r21 <- preempt_count
826 (pUStk) mov r21=0 // r21 <- 0
827 ;;
828 cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
829 #else
830 (pUStk) rsm psr.i
831 cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
832 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
833 #endif
834 .work_processed_kernel:
835 adds r17=TI_FLAGS+IA64_TASK_SIZE,r13
836 ;;
837 (p6) ld4 r31=[r17] // load current_thread_info()->flags
838 adds r21=PT(PR)+16,r12
839 ;;
841 lfetch [r21],PT(CR_IPSR)-PT(PR)
842 adds r2=PT(B6)+16,r12
843 adds r3=PT(R16)+16,r12
844 ;;
845 lfetch [r21]
846 ld8 r28=[r2],8 // load b6
847 adds r29=PT(R24)+16,r12
849 ld8.fill r16=[r3],PT(AR_CSD)-PT(R16)
850 adds r30=PT(AR_CCV)+16,r12
851 (p6) and r19=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
852 ;;
853 ld8.fill r24=[r29]
854 ld8 r15=[r30] // load ar.ccv
855 (p6) cmp4.ne.unc p6,p0=r19, r0 // any special work pending?
856 ;;
857 ld8 r29=[r2],16 // load b7
858 ld8 r30=[r3],16 // load ar.csd
859 (p6) br.cond.spnt .work_pending
860 ;;
861 ld8 r31=[r2],16 // load ar.ssd
862 ld8.fill r8=[r3],16
863 ;;
864 ld8.fill r9=[r2],16
865 ld8.fill r10=[r3],PT(R17)-PT(R10)
866 ;;
867 ld8.fill r11=[r2],PT(R18)-PT(R11)
868 ld8.fill r17=[r3],16
869 ;;
870 ld8.fill r18=[r2],16
871 ld8.fill r19=[r3],16
872 ;;
873 ld8.fill r20=[r2],16
874 ld8.fill r21=[r3],16
875 mov ar.csd=r30
876 mov ar.ssd=r31
877 ;;
878 rsm psr.i | psr.ic // initiate turning off of interrupt and interruption collection
879 invala // invalidate ALAT
880 ;;
881 ld8.fill r22=[r2],24
882 ld8.fill r23=[r3],24
883 mov b6=r28
884 ;;
885 ld8.fill r25=[r2],16
886 ld8.fill r26=[r3],16
887 mov b7=r29
888 ;;
889 ld8.fill r27=[r2],16
890 ld8.fill r28=[r3],16
891 ;;
892 ld8.fill r29=[r2],16
893 ld8.fill r30=[r3],24
894 ;;
895 ld8.fill r31=[r2],PT(F9)-PT(R31)
896 adds r3=PT(F10)-PT(F6),r3
897 ;;
898 ldf.fill f9=[r2],PT(F6)-PT(F9)
899 ldf.fill f10=[r3],PT(F8)-PT(F10)
900 ;;
901 ldf.fill f6=[r2],PT(F7)-PT(F6)
902 ;;
903 ldf.fill f7=[r2],PT(F11)-PT(F7)
904 ldf.fill f8=[r3],32
905 ;;
906 srlz.d // ensure that inter. collection is off (VHPT is don't care, since text is pinned)
907 mov ar.ccv=r15
908 ;;
909 ldf.fill f11=[r2]
910 bsw.0 // switch back to bank 0 (no stop bit required beforehand...)
911 ;;
912 (pUStk) mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
913 adds r16=PT(CR_IPSR)+16,r12
914 adds r17=PT(CR_IIP)+16,r12
916 (pKStk) mov r22=psr // M2 read PSR now that interrupts are disabled
917 nop.i 0
918 nop.i 0
919 ;;
920 ld8 r29=[r16],16 // load cr.ipsr
921 ld8 r28=[r17],16 // load cr.iip
922 ;;
923 ld8 r30=[r16],16 // load cr.ifs
924 ld8 r25=[r17],16 // load ar.unat
925 ;;
926 ld8 r26=[r16],16 // load ar.pfs
927 ld8 r27=[r17],16 // load ar.rsc
928 cmp.eq p9,p0=r0,r0 // set p9 to indicate that we should restore cr.ifs
929 ;;
930 ld8 r24=[r16],16 // load ar.rnat (may be garbage)
931 ld8 r23=[r17],16 // load ar.bspstore (may be garbage)
932 ;;
933 ld8 r31=[r16],16 // load predicates
934 ld8 r21=[r17],16 // load b0
935 ;;
936 ld8 r19=[r16],16 // load ar.rsc value for "loadrs"
937 ld8.fill r1=[r17],16 // load r1
938 ;;
939 ld8.fill r12=[r16],16
940 ld8.fill r13=[r17],16
941 (pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18
942 ;;
943 ld8 r20=[r16],16 // ar.fpsr
944 ld8.fill r15=[r17],16
945 ;;
946 ld8.fill r14=[r16],16
947 ld8.fill r2=[r17]
948 (pUStk) mov r17=1
949 ;;
950 ld8.fill r3=[r16]
951 (pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
952 shr.u r18=r19,16 // get byte size of existing "dirty" partition
953 ;;
954 mov r16=ar.bsp // get existing backing store pointer
955 LOAD_PHYS_STACK_REG_SIZE(r17)
956 (pKStk) br.cond.dpnt skip_rbs_switch
958 /*
959 * Restore user backing store.
960 *
961 * NOTE: alloc, loadrs, and cover can't be predicated.
962 */
963 (pNonSys) br.cond.dpnt dont_preserve_current_frame
964 cover // add current frame into dirty partition and set cr.ifs
965 ;;
966 mov r19=ar.bsp // get new backing store pointer
967 rbs_switch:
968 sub r16=r16,r18 // krbs = old bsp - size of dirty partition
969 cmp.ne p9,p0=r0,r0 // clear p9 to skip restore of cr.ifs
970 ;;
971 sub r19=r19,r16 // calculate total byte size of dirty partition
972 add r18=64,r18 // don't force in0-in7 into memory...
973 ;;
974 shl r19=r19,16 // shift size of dirty partition into loadrs position
975 ;;
976 dont_preserve_current_frame:
977 /*
978 * To prevent leaking bits between the kernel and user-space,
979 * we must clear the stacked registers in the "invalid" partition here.
980 * Not pretty, but at least it's fast (3.34 registers/cycle on Itanium,
981 * 5 registers/cycle on McKinley).
982 */
983 # define pRecurse p6
984 # define pReturn p7
985 #ifdef CONFIG_ITANIUM
986 # define Nregs 10
987 #else
988 # define Nregs 14
989 #endif
990 alloc loc0=ar.pfs,2,Nregs-2,2,0
991 shr.u loc1=r18,9 // RNaTslots <= floor(dirtySize / (64*8))
992 sub r17=r17,r18 // r17 = (physStackedSize + 8) - dirtySize
993 ;;
994 mov ar.rsc=r19 // load ar.rsc to be used for "loadrs"
995 shladd in0=loc1,3,r17
996 mov in1=0
997 ;;
998 TEXT_ALIGN(32)
999 rse_clear_invalid:
1000 #ifdef CONFIG_ITANIUM
1001 // cycle 0
1002 { .mii
1003 alloc loc0=ar.pfs,2,Nregs-2,2,0
1004 cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse
1005 add out0=-Nregs*8,in0
1006 }{ .mfb
1007 add out1=1,in1 // increment recursion count
1008 nop.f 0
1009 nop.b 0 // can't do br.call here because of alloc (WAW on CFM)
1010 ;;
1011 }{ .mfi // cycle 1
1012 mov loc1=0
1013 nop.f 0
1014 mov loc2=0
1015 }{ .mib
1016 mov loc3=0
1017 mov loc4=0
1018 (pRecurse) br.call.sptk.many b0=rse_clear_invalid
1020 }{ .mfi // cycle 2
1021 mov loc5=0
1022 nop.f 0
1023 cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret
1024 }{ .mib
1025 mov loc6=0
1026 mov loc7=0
1027 (pReturn) br.ret.sptk.many b0
1028 }
1029 #else /* !CONFIG_ITANIUM */
1030 alloc loc0=ar.pfs,2,Nregs-2,2,0
1031 cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse
1032 add out0=-Nregs*8,in0
1033 add out1=1,in1 // increment recursion count
1034 mov loc1=0
1035 mov loc2=0
1036 ;;
1037 mov loc3=0
1038 mov loc4=0
1039 mov loc5=0
1040 mov loc6=0
1041 mov loc7=0
1042 (pRecurse) br.call.dptk.few b0=rse_clear_invalid
1043 ;;
1044 mov loc8=0
1045 mov loc9=0
1046 cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret
1047 mov loc10=0
1048 mov loc11=0
1049 (pReturn) br.ret.dptk.many b0
1050 #endif /* !CONFIG_ITANIUM */
1051 # undef pRecurse
1052 # undef pReturn
1053 ;;
1054 alloc r17=ar.pfs,0,0,0,0 // drop current register frame
1055 ;;
1056 loadrs
1057 ;;
1058 skip_rbs_switch:
1059 mov ar.unat=r25 // M2
1060 (pKStk) extr.u r22=r22,21,1 // I0 extract current value of psr.pp from r22
1061 (pLvSys)mov r19=r0 // A clear r19 for leave_syscall, no-op otherwise
1062 ;;
1063 (pUStk) mov ar.bspstore=r23 // M2
1064 (pKStk) dep r29=r22,r29,21,1 // I0 update ipsr.pp with psr.pp
1065 (pLvSys)mov r16=r0 // A clear r16 for leave_syscall, no-op otherwise
1066 ;;
1067 mov cr.ipsr=r29 // M2
1068 mov ar.pfs=r26 // I0
1069 (pLvSys)mov r17=r0 // A clear r17 for leave_syscall, no-op otherwise
1071 (p9) mov cr.ifs=r30 // M2
1072 mov b0=r21 // I0
1073 (pLvSys)mov r18=r0 // A clear r18 for leave_syscall, no-op otherwise
1075 mov ar.fpsr=r20 // M2
1076 mov cr.iip=r28 // M2
1077 nop 0
1078 ;;
1079 (pUStk) mov ar.rnat=r24 // M2 must happen with RSE in lazy mode
1080 nop 0
1081 (pLvSys)mov r2=r0
1083 mov ar.rsc=r27 // M2
1084 mov pr=r31,-1 // I0
1085 rfi // B
1087 /*
1088 * On entry:
1089 * r20 = ¤t->thread_info->pre_count (if CONFIG_PREEMPT)
1090 * r31 = current->thread_info->flags
1091 * On exit:
1092 * p6 = TRUE if work-pending-check needs to be redone
1093 */
1094 .work_pending_syscall:
1095 add r2=-8,r2
1096 add r3=-8,r3
1097 ;;
1098 st8 [r2]=r8
1099 st8 [r3]=r10
1100 .work_pending:
1101 tbit.z p6,p0=r31,TIF_NEED_RESCHED // current_thread_info()->need_resched==0?
1102 (p6) br.cond.sptk.few .notify
1103 #ifdef CONFIG_PREEMPT
1104 (pKStk) dep r21=-1,r0,PREEMPT_ACTIVE_BIT,1
1105 ;;
1106 (pKStk) st4 [r20]=r21
1107 ssm psr.i // enable interrupts
1108 #endif
1109 br.call.spnt.many rp=schedule
1110 .ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1
1111 rsm psr.i // disable interrupts
1112 ;;
1113 #ifdef CONFIG_PREEMPT
1114 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
1115 ;;
1116 (pKStk) st4 [r20]=r0 // preempt_count() <- 0
1117 #endif
1118 (pLvSys)br.cond.sptk.few .work_pending_syscall_end
1119 br.cond.sptk.many .work_processed_kernel // re-check
1121 .notify:
1122 (pUStk) br.call.spnt.many rp=notify_resume_user
1123 .ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0
1124 (pLvSys)br.cond.sptk.few .work_pending_syscall_end
1125 br.cond.sptk.many .work_processed_kernel // don't re-check
1127 .work_pending_syscall_end:
1128 adds r2=PT(R8)+16,r12
1129 adds r3=PT(R10)+16,r12
1130 ;;
1131 ld8 r8=[r2]
1132 ld8 r10=[r3]
1133 br.cond.sptk.many .work_processed_syscall // re-check
1135 END(ia64_leave_kernel)
1137 ENTRY(handle_syscall_error)
1138 /*
1139 * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could
1140 * lead us to mistake a negative return value as a failed syscall. Those syscall
1141 * must deposit a non-zero value in pt_regs.r8 to indicate an error. If
1142 * pt_regs.r8 is zero, we assume that the call completed successfully.
1143 */
1144 PT_REGS_UNWIND_INFO(0)
1145 ld8 r3=[r2] // load pt_regs.r8
1146 ;;
1147 cmp.eq p6,p7=r3,r0 // is pt_regs.r8==0?
1148 ;;
1149 (p7) mov r10=-1
1150 (p7) sub r8=0,r8 // negate return value to get errno
1151 br.cond.sptk ia64_leave_syscall
1152 END(handle_syscall_error)
1154 /*
1155 * Invoke schedule_tail(task) while preserving in0-in7, which may be needed
1156 * in case a system call gets restarted.
1157 */
1158 GLOBAL_ENTRY(ia64_invoke_schedule_tail)
1159 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
1160 alloc loc1=ar.pfs,8,2,1,0
1161 mov loc0=rp
1162 mov out0=r8 // Address of previous task
1163 ;;
1164 br.call.sptk.many rp=schedule_tail
1165 .ret11: mov ar.pfs=loc1
1166 mov rp=loc0
1167 br.ret.sptk.many rp
1168 END(ia64_invoke_schedule_tail)
1170 /*
1171 * Setup stack and call do_notify_resume_user(). Note that pSys and pNonSys need to
1172 * be set up by the caller. We declare 8 input registers so the system call
1173 * args get preserved, in case we need to restart a system call.
1174 */
1175 ENTRY(notify_resume_user)
1176 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
1177 alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
1178 mov r9=ar.unat
1179 mov loc0=rp // save return address
1180 mov out0=0 // there is no "oldset"
1181 adds out1=8,sp // out1=&sigscratch->ar_pfs
1182 (pSys) mov out2=1 // out2==1 => we're in a syscall
1183 ;;
1184 (pNonSys) mov out2=0 // out2==0 => not a syscall
1185 .fframe 16
1186 .spillsp ar.unat, 16
1187 st8 [sp]=r9,-16 // allocate space for ar.unat and save it
1188 st8 [out1]=loc1,-8 // save ar.pfs, out1=&sigscratch
1189 .body
1190 br.call.sptk.many rp=do_notify_resume_user
1191 .ret15: .restore sp
1192 adds sp=16,sp // pop scratch stack space
1193 ;;
1194 ld8 r9=[sp] // load new unat from sigscratch->scratch_unat
1195 mov rp=loc0
1196 ;;
1197 mov ar.unat=r9
1198 mov ar.pfs=loc1
1199 br.ret.sptk.many rp
1200 END(notify_resume_user)
1202 ENTRY(sys_rt_sigreturn)
1203 PT_REGS_UNWIND_INFO(0)
1204 /*
1205 * Allocate 8 input registers since ptrace() may clobber them
1206 */
1207 alloc r2=ar.pfs,8,0,1,0
1208 .prologue
1209 PT_REGS_SAVES(16)
1210 adds sp=-16,sp
1211 .body
1212 cmp.eq pNonSys,pSys=r0,r0 // sigreturn isn't a normal syscall...
1213 ;;
1214 /*
1215 * leave_kernel() restores f6-f11 from pt_regs, but since the streamlined
1216 * syscall-entry path does not save them we save them here instead. Note: we
1217 * don't need to save any other registers that are not saved by the stream-lined
1218 * syscall path, because restore_sigcontext() restores them.
1219 */
1220 adds r16=PT(F6)+32,sp
1221 adds r17=PT(F7)+32,sp
1222 ;;
1223 stf.spill [r16]=f6,32
1224 stf.spill [r17]=f7,32
1225 ;;
1226 stf.spill [r16]=f8,32
1227 stf.spill [r17]=f9,32
1228 ;;
1229 stf.spill [r16]=f10
1230 stf.spill [r17]=f11
1231 adds out0=16,sp // out0 = &sigscratch
1232 br.call.sptk.many rp=ia64_rt_sigreturn
1233 .ret19: .restore sp,0
1234 adds sp=16,sp
1235 ;;
1236 ld8 r9=[sp] // load new ar.unat
1237 mov.sptk b7=r8,ia64_leave_kernel
1238 ;;
1239 mov ar.unat=r9
1240 br.many b7
1241 END(sys_rt_sigreturn)
1243 GLOBAL_ENTRY(ia64_prepare_handle_unaligned)
1244 .prologue
1245 /*
1246 * r16 = fake ar.pfs, we simply need to make sure privilege is still 0
1247 */
1248 mov r16=r0
1249 DO_SAVE_SWITCH_STACK
1250 br.call.sptk.many rp=ia64_handle_unaligned // stack frame setup in ivt
1251 .ret21: .body
1252 DO_LOAD_SWITCH_STACK
1253 br.cond.sptk.many rp // goes to ia64_leave_kernel
1254 END(ia64_prepare_handle_unaligned)
1256 //
1257 // unw_init_running(void (*callback)(info, arg), void *arg)
1258 //
1259 # define EXTRA_FRAME_SIZE ((UNW_FRAME_INFO_SIZE+15)&~15)
1261 GLOBAL_ENTRY(unw_init_running)
1262 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
1263 alloc loc1=ar.pfs,2,3,3,0
1264 ;;
1265 ld8 loc2=[in0],8
1266 mov loc0=rp
1267 mov r16=loc1
1268 DO_SAVE_SWITCH_STACK
1269 .body
1271 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
1272 .fframe IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE
1273 SWITCH_STACK_SAVES(EXTRA_FRAME_SIZE)
1274 adds sp=-EXTRA_FRAME_SIZE,sp
1275 .body
1276 ;;
1277 adds out0=16,sp // &info
1278 mov out1=r13 // current
1279 adds out2=16+EXTRA_FRAME_SIZE,sp // &switch_stack
1280 br.call.sptk.many rp=unw_init_frame_info
1281 1: adds out0=16,sp // &info
1282 mov b6=loc2
1283 mov loc2=gp // save gp across indirect function call
1284 ;;
1285 ld8 gp=[in0]
1286 mov out1=in1 // arg
1287 br.call.sptk.many rp=b6 // invoke the callback function
1288 1: mov gp=loc2 // restore gp
1290 // For now, we don't allow changing registers from within
1291 // unw_init_running; if we ever want to allow that, we'd
1292 // have to do a load_switch_stack here:
1293 .restore sp
1294 adds sp=IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE,sp
1296 mov ar.pfs=loc1
1297 mov rp=loc0
1298 br.ret.sptk.many rp
1299 END(unw_init_running)
1301 .rodata
1302 .align 8
1303 .globl sys_call_table
1304 sys_call_table:
1305 data8 sys_ni_syscall // This must be sys_ni_syscall! See ivt.S.
1306 data8 sys_exit // 1025
1307 data8 sys_read
1308 data8 sys_write
1309 data8 sys_open
1310 data8 sys_close
1311 data8 sys_creat // 1030
1312 data8 sys_link
1313 data8 sys_unlink
1314 data8 ia64_execve
1315 data8 sys_chdir
1316 data8 sys_fchdir // 1035
1317 data8 sys_utimes
1318 data8 sys_mknod
1319 data8 sys_chmod
1320 data8 sys_chown
1321 data8 sys_lseek // 1040
1322 data8 sys_getpid
1323 data8 sys_getppid
1324 data8 sys_mount
1325 data8 sys_umount
1326 data8 sys_setuid // 1045
1327 data8 sys_getuid
1328 data8 sys_geteuid
1329 data8 sys_ptrace
1330 data8 sys_access
1331 data8 sys_sync // 1050
1332 data8 sys_fsync
1333 data8 sys_fdatasync
1334 data8 sys_kill
1335 data8 sys_rename
1336 data8 sys_mkdir // 1055
1337 data8 sys_rmdir
1338 data8 sys_dup
1339 data8 sys_pipe
1340 data8 sys_times
1341 data8 ia64_brk // 1060
1342 data8 sys_setgid
1343 data8 sys_getgid
1344 data8 sys_getegid
1345 data8 sys_acct
1346 data8 sys_ioctl // 1065
1347 data8 sys_fcntl
1348 data8 sys_umask
1349 data8 sys_chroot
1350 data8 sys_ustat
1351 data8 sys_dup2 // 1070
1352 data8 sys_setreuid
1353 data8 sys_setregid
1354 data8 sys_getresuid
1355 data8 sys_setresuid
1356 data8 sys_getresgid // 1075
1357 data8 sys_setresgid
1358 data8 sys_getgroups
1359 data8 sys_setgroups
1360 data8 sys_getpgid
1361 data8 sys_setpgid // 1080
1362 data8 sys_setsid
1363 data8 sys_getsid
1364 data8 sys_sethostname
1365 data8 sys_setrlimit
1366 data8 sys_getrlimit // 1085
1367 data8 sys_getrusage
1368 data8 sys_gettimeofday
1369 data8 sys_settimeofday
1370 data8 sys_select
1371 data8 sys_poll // 1090
1372 data8 sys_symlink
1373 data8 sys_readlink
1374 data8 sys_uselib
1375 data8 sys_swapon
1376 data8 sys_swapoff // 1095
1377 data8 sys_reboot
1378 data8 sys_truncate
1379 data8 sys_ftruncate
1380 data8 sys_fchmod
1381 data8 sys_fchown // 1100
1382 data8 ia64_getpriority
1383 data8 sys_setpriority
1384 data8 sys_statfs
1385 data8 sys_fstatfs
1386 data8 sys_gettid // 1105
1387 data8 sys_semget
1388 data8 sys_semop
1389 data8 sys_semctl
1390 data8 sys_msgget
1391 data8 sys_msgsnd // 1110
1392 data8 sys_msgrcv
1393 data8 sys_msgctl
1394 data8 sys_shmget
1395 data8 sys_shmat
1396 data8 sys_shmdt // 1115
1397 data8 sys_shmctl
1398 data8 sys_syslog
1399 data8 sys_setitimer
1400 data8 sys_getitimer
1401 data8 sys_ni_syscall // 1120 /* was: ia64_oldstat */
1402 data8 sys_ni_syscall /* was: ia64_oldlstat */
1403 data8 sys_ni_syscall /* was: ia64_oldfstat */
1404 data8 sys_vhangup
1405 data8 sys_lchown
1406 data8 sys_remap_file_pages // 1125
1407 data8 sys_wait4
1408 data8 sys_sysinfo
1409 data8 sys_clone
1410 data8 sys_setdomainname
1411 data8 sys_newuname // 1130
1412 data8 sys_adjtimex
1413 data8 sys_ni_syscall /* was: ia64_create_module */
1414 data8 sys_init_module
1415 data8 sys_delete_module
1416 data8 sys_ni_syscall // 1135 /* was: sys_get_kernel_syms */
1417 data8 sys_ni_syscall /* was: sys_query_module */
1418 data8 sys_quotactl
1419 data8 sys_bdflush
1420 data8 sys_sysfs
1421 data8 sys_personality // 1140
1422 data8 sys_ni_syscall // sys_afs_syscall
1423 data8 sys_setfsuid
1424 data8 sys_setfsgid
1425 data8 sys_getdents
1426 data8 sys_flock // 1145
1427 data8 sys_readv
1428 data8 sys_writev
1429 data8 sys_pread64
1430 data8 sys_pwrite64
1431 data8 sys_sysctl // 1150
1432 data8 sys_mmap
1433 data8 sys_munmap
1434 data8 sys_mlock
1435 data8 sys_mlockall
1436 data8 sys_mprotect // 1155
1437 data8 ia64_mremap
1438 data8 sys_msync
1439 data8 sys_munlock
1440 data8 sys_munlockall
1441 data8 sys_sched_getparam // 1160
1442 data8 sys_sched_setparam
1443 data8 sys_sched_getscheduler
1444 data8 sys_sched_setscheduler
1445 data8 sys_sched_yield
1446 data8 sys_sched_get_priority_max // 1165
1447 data8 sys_sched_get_priority_min
1448 data8 sys_sched_rr_get_interval
1449 data8 sys_nanosleep
1450 data8 sys_nfsservctl
1451 data8 sys_prctl // 1170
1452 data8 sys_getpagesize
1453 data8 sys_mmap2
1454 data8 sys_pciconfig_read
1455 data8 sys_pciconfig_write
1456 data8 sys_perfmonctl // 1175
1457 data8 sys_sigaltstack
1458 data8 sys_rt_sigaction
1459 data8 sys_rt_sigpending
1460 data8 sys_rt_sigprocmask
1461 data8 sys_rt_sigqueueinfo // 1180
1462 data8 sys_rt_sigreturn
1463 data8 sys_rt_sigsuspend
1464 data8 sys_rt_sigtimedwait
1465 data8 sys_getcwd
1466 data8 sys_capget // 1185
1467 data8 sys_capset
1468 data8 sys_sendfile64
1469 data8 sys_ni_syscall // sys_getpmsg (STREAMS)
1470 data8 sys_ni_syscall // sys_putpmsg (STREAMS)
1471 data8 sys_socket // 1190
1472 data8 sys_bind
1473 data8 sys_connect
1474 data8 sys_listen
1475 data8 sys_accept
1476 data8 sys_getsockname // 1195
1477 data8 sys_getpeername
1478 data8 sys_socketpair
1479 data8 sys_send
1480 data8 sys_sendto
1481 data8 sys_recv // 1200
1482 data8 sys_recvfrom
1483 data8 sys_shutdown
1484 data8 sys_setsockopt
1485 data8 sys_getsockopt
1486 data8 sys_sendmsg // 1205
1487 data8 sys_recvmsg
1488 data8 sys_pivot_root
1489 data8 sys_mincore
1490 data8 sys_madvise
1491 data8 sys_newstat // 1210
1492 data8 sys_newlstat
1493 data8 sys_newfstat
1494 data8 sys_clone2
1495 data8 sys_getdents64
1496 data8 sys_getunwind // 1215
1497 data8 sys_readahead
1498 data8 sys_setxattr
1499 data8 sys_lsetxattr
1500 data8 sys_fsetxattr
1501 data8 sys_getxattr // 1220
1502 data8 sys_lgetxattr
1503 data8 sys_fgetxattr
1504 data8 sys_listxattr
1505 data8 sys_llistxattr
1506 data8 sys_flistxattr // 1225
1507 data8 sys_removexattr
1508 data8 sys_lremovexattr
1509 data8 sys_fremovexattr
1510 data8 sys_tkill
1511 data8 sys_futex // 1230
1512 data8 sys_sched_setaffinity
1513 data8 sys_sched_getaffinity
1514 data8 sys_set_tid_address
1515 data8 sys_fadvise64_64
1516 data8 sys_tgkill // 1235
1517 data8 sys_exit_group
1518 data8 sys_lookup_dcookie
1519 data8 sys_io_setup
1520 data8 sys_io_destroy
1521 data8 sys_io_getevents // 1240
1522 data8 sys_io_submit
1523 data8 sys_io_cancel
1524 data8 sys_epoll_create
1525 data8 sys_epoll_ctl
1526 data8 sys_epoll_wait // 1245
1527 data8 sys_restart_syscall
1528 data8 sys_semtimedop
1529 data8 sys_timer_create
1530 data8 sys_timer_settime
1531 data8 sys_timer_gettime // 1250
1532 data8 sys_timer_getoverrun
1533 data8 sys_timer_delete
1534 data8 sys_clock_settime
1535 data8 sys_clock_gettime
1536 data8 sys_clock_getres // 1255
1537 data8 sys_clock_nanosleep
1538 data8 sys_fstatfs64
1539 data8 sys_statfs64
1540 data8 sys_mbind
1541 data8 sys_get_mempolicy // 1260
1542 data8 sys_set_mempolicy
1543 data8 sys_mq_open
1544 data8 sys_mq_unlink
1545 data8 sys_mq_timedsend
1546 data8 sys_mq_timedreceive // 1265
1547 data8 sys_mq_notify
1548 data8 sys_mq_getsetattr
1549 data8 sys_kexec_load
1550 data8 sys_ni_syscall // reserved for vserver
1551 data8 sys_waitid // 1270
1552 data8 sys_add_key
1553 data8 sys_request_key
1554 data8 sys_keyctl
1555 data8 sys_ioprio_set
1556 data8 sys_ioprio_get // 1275
1557 data8 sys_move_pages
1558 data8 sys_inotify_init
1559 data8 sys_inotify_add_watch
1560 data8 sys_inotify_rm_watch
1561 data8 sys_migrate_pages // 1280
1562 data8 sys_openat
1563 data8 sys_mkdirat
1564 data8 sys_mknodat
1565 data8 sys_fchownat
1566 data8 sys_futimesat // 1285
1567 data8 sys_newfstatat
1568 data8 sys_unlinkat
1569 data8 sys_renameat
1570 data8 sys_linkat
1571 data8 sys_symlinkat // 1290
1572 data8 sys_readlinkat
1573 data8 sys_fchmodat
1574 data8 sys_faccessat
1575 data8 sys_pselect6
1576 data8 sys_ppoll
1577 data8 sys_unshare
1578 data8 sys_splice
1579 data8 sys_set_robust_list
1580 data8 sys_get_robust_list
1581 data8 sys_sync_file_range // 1300
1582 data8 sys_tee
1583 data8 sys_vmsplice
1584 data8 sys_ni_syscall // reserved for move_pages
1585 data8 sys_getcpu
1586 data8 sys_epoll_pwait // 1305
1587 data8 sys_utimensat
1588 data8 sys_signalfd
1589 data8 sys_timerfd
1590 data8 sys_eventfd
1592 .org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls