2 * arch/ia64/kernel/entry.S
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>
17 * ia64_switch_to now places correct virtual mapping in in TR2 for
18 * kernel stack. This allows us to handle interrupts without changing
21 * Jonathan Nicklin <nicklin@missioncriticallinux.com>
22 * Patrick O'Rourke <orourke@missioncriticallinux.com>
26 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
27 * VA Linux Systems Japan K.K.
31 * Global (preserved) predicate usage on syscall entry/exit path:
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>
53 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
55 * execve() is special because in case of success, we need to
56 * setup a null register window frame.
60 * Allocate 8 input registers since ptrace() may clobber them
62 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
63 alloc loc1=ar.pfs,8,2,4,0
66 mov out0=in0 // filename
67 ;; // stop bit between alloc and call
70 add out3=16,sp // regs
71 br.call.sptk.many rp=sys_execve
73 #ifdef CONFIG_IA32_SUPPORT
75 * Check if we're returning to ia32 mode. If so, we need to restore ia32 registers
78 adds r16=PT(CR_IPSR)+16,sp
83 mov ar.pfs=loc1 // restore ar.pfs
84 sxt4 r8=r8 // return 64-bit result
87 (p6) cmp.ne pKStk,pUStk=r0,r0 // a successful execve() lands us in user-mode...
89 (p6) mov ar.pfs=r0 // clear ar.pfs on success
90 (p7) br.ret.sptk.many rp
93 * In theory, we'd have to zap this state only to prevent leaking of
94 * security sensitive state (e.g., if current->mm->dumpable is zero). However,
95 * this executes in less than 20 cycles even on Itanium, so it's not worth
98 mov ar.unat=0; mov ar.lc=0
99 mov r4=0; mov f2=f0; mov b1=r0
100 mov r5=0; mov f3=f0; mov b2=r0
101 mov r6=0; mov f4=f0; mov b3=r0
102 mov r7=0; mov f5=f0; mov b4=r0
103 ldf.fill f12=[sp]; mov f13=f0; mov b5=r0
104 ldf.fill f14=[sp]; ldf.fill f15=[sp]; mov f16=f0
105 ldf.fill f17=[sp]; ldf.fill f18=[sp]; mov f19=f0
106 ldf.fill f20=[sp]; ldf.fill f21=[sp]; mov f22=f0
107 ldf.fill f23=[sp]; ldf.fill f24=[sp]; mov f25=f0
108 ldf.fill f26=[sp]; ldf.fill f27=[sp]; mov f28=f0
109 ldf.fill f29=[sp]; ldf.fill f30=[sp]; mov f31=f0
110 #ifdef CONFIG_IA32_SUPPORT
111 tbit.nz p6,p0=r16, IA64_PSR_IS_BIT
112 movl loc0=ia64_ret_from_ia32_execve
120 * sys_clone2(u64 flags, u64 ustack_base, u64 ustack_size, u64 parent_tidptr, u64 child_tidptr,
123 GLOBAL_ENTRY(sys_clone2)
125 * Allocate 8 input registers since ptrace() may clobber them
127 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
128 alloc r16=ar.pfs,8,2,6,0
130 adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp
132 mov loc1=r16 // save ar.pfs across do_fork
136 tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
137 mov out4=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
139 (p6) st8 [r2]=in5 // store TLS in r16 for copy_thread()
140 mov out5=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
141 adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
142 mov out0=in0 // out0 = clone_flags
143 br.call.sptk.many rp=do_fork
145 adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
152 * sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls)
153 * Deprecated. Use sys_clone2() instead.
155 GLOBAL_ENTRY(sys_clone)
157 * Allocate 8 input registers since ptrace() may clobber them
159 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
160 alloc r16=ar.pfs,8,2,6,0
162 adds r2=PT(R16)+IA64_SWITCH_STACK_SIZE+16,sp
164 mov loc1=r16 // save ar.pfs across do_fork
167 mov out3=16 // stacksize (compensates for 16-byte scratch area)
168 tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
169 mov out4=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
171 (p6) st8 [r2]=in4 // store TLS in r13 (tp)
172 mov out5=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
173 adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
174 mov out0=in0 // out0 = clone_flags
175 br.call.sptk.many rp=do_fork
177 adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
182 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
185 * prev_task <- ia64_switch_to(struct task_struct *next)
186 * With Ingo's new scheduler, interrupts are disabled when this routine gets
187 * called. The code starting at .map relies on this. The rest of the code
188 * doesn't care about the interrupt masking status.
190 GLOBAL_ENTRY(__paravirt_switch_to)
192 alloc r16=ar.pfs,1,0,0,0
196 adds r22=IA64_TASK_THREAD_KSP_OFFSET,r13
198 mov r27=IA64_KR(CURRENT_STACK)
199 adds r21=IA64_TASK_THREAD_KSP_OFFSET,in0
200 dep r20=0,in0,61,3 // physical address of "next"
202 st8 [r22]=sp // save kernel stack pointer of old task
203 shr.u r26=r20,IA64_GRANULE_SHIFT
207 * If we've already mapped this task's page, we can skip doing it again.
209 (p6) cmp.eq p7,p6=r26,r27
210 (p6) br.cond.dpnt .map
213 ld8 sp=[r21] // load kernel stack pointer of new task
214 MOV_TO_KR(CURRENT, in0, r8, r9) // update "current" application register
215 mov r8=r13 // return pointer to previously running task
216 mov r13=in0 // set "current" pointer
221 sync.i // ensure "fc"s done by this CPU are visible on other CPUs
223 br.ret.sptk.many rp // boogie on out in new context
226 RSM_PSR_IC(r25) // interrupts (psr.i) are already disabled here
230 or r23=r25,r20 // construct PA | page properties
231 mov r25=IA64_GRANULE_SHIFT<<2
233 MOV_TO_ITIR(p0, r25, r8)
234 MOV_TO_IFA(in0, r8) // VA of next task...
236 mov r25=IA64_TR_CURRENT_STACK
237 MOV_TO_KR(CURRENT_STACK, r26, r8, r9) // remember last page we mapped...
239 itr.d dtr[r25]=r23 // wire in new mapping...
240 SSM_PSR_IC_AND_SRLZ_D(r8, r9) // reenable the psr.ic bit
242 END(__paravirt_switch_to)
244 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
246 * Note that interrupts are enabled during save_switch_stack and load_switch_stack. This
247 * means that we may get an interrupt with "sp" pointing to the new kernel stack while
248 * ar.bspstore is still pointing to the old kernel backing store area. Since ar.rsc,
249 * ar.rnat, ar.bsp, and ar.bspstore are all preserved by interrupts, this is not a
250 * problem. Also, we don't need to specify unwind information for preserved registers
251 * that are not modified in save_switch_stack as the right unwind information is already
252 * specified at the call-site of save_switch_stack.
258 * - b7 holds address to return to
259 * - rp (b0) holds return address to save
261 GLOBAL_ENTRY(save_switch_stack)
264 flushrs // flush dirty regs to backing store (must be first in insn group)
266 mov r17=ar.unat // preserve caller's
268 #ifdef CONFIG_ITANIUM
271 adds r14=SW(R4)+16,sp
273 st8.spill [r14]=r4,16 // spill r4
274 lfetch.fault.excl.nt1 [r3],128
276 lfetch.fault.excl.nt1 [r2],128
277 lfetch.fault.excl.nt1 [r3],128
279 lfetch.fault.excl [r2]
280 lfetch.fault.excl [r3]
281 adds r15=SW(R5)+16,sp
287 st8.spill [r14]=r4,SW(R6)-SW(R4) // spill r4 and prefetch offset 0x1c0
288 lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x010
290 lfetch.fault.excl.nt1 [r3],128 // prefetch offset 0x090
291 lfetch.fault.excl.nt1 [r2],128 // prefetch offset 0x190
293 lfetch.fault.excl.nt1 [r3] // prefetch offset 0x110
294 lfetch.fault.excl.nt1 [r2] // prefetch offset 0x210
295 adds r15=SW(R5)+16,sp
298 st8.spill [r15]=r5,SW(R7)-SW(R5) // spill r5
299 mov.m ar.rsc=0 // put RSE in mode: enforced lazy, little endian, pl 0
300 add r2=SW(F2)+16,sp // r2 = &sw->f2
302 st8.spill [r14]=r6,SW(B0)-SW(R6) // spill r6
303 mov.m r18=ar.fpsr // preserve fpsr
304 add r3=SW(F3)+16,sp // r3 = &sw->f3
311 st8.spill [r15]=r7,SW(B2)-SW(R7) // spill r7
314 // since we're done with the spills, read and save ar.unat:
316 mov.m r20=ar.bspstore
322 st8 [r14]=r21,SW(B1)-SW(B0) // save b0
323 st8 [r15]=r23,SW(B3)-SW(B2) // save b2
327 st8 [r14]=r22,SW(B4)-SW(B1) // save b1
328 st8 [r15]=r24,SW(AR_PFS)-SW(B3) // save b3
329 mov r21=ar.lc // I-unit
330 stf.spill [r2]=f12,32
331 stf.spill [r3]=f13,32
333 st8 [r14]=r25,SW(B5)-SW(B4) // save b4
334 st8 [r15]=r16,SW(AR_LC)-SW(AR_PFS) // save ar.pfs
335 stf.spill [r2]=f14,32
336 stf.spill [r3]=f15,32
338 st8 [r14]=r26 // save b5
339 st8 [r15]=r21 // save ar.lc
340 stf.spill [r2]=f16,32
341 stf.spill [r3]=f17,32
343 stf.spill [r2]=f18,32
344 stf.spill [r3]=f19,32
346 stf.spill [r2]=f20,32
347 stf.spill [r3]=f21,32
349 stf.spill [r2]=f22,32
350 stf.spill [r3]=f23,32
352 stf.spill [r2]=f24,32
353 stf.spill [r3]=f25,32
355 stf.spill [r2]=f26,32
356 stf.spill [r3]=f27,32
358 stf.spill [r2]=f28,32
359 stf.spill [r3]=f29,32
361 stf.spill [r2]=f30,SW(AR_UNAT)-SW(F30)
362 stf.spill [r3]=f31,SW(PR)-SW(F31)
363 add r14=SW(CALLER_UNAT)+16,sp
365 st8 [r2]=r29,SW(AR_RNAT)-SW(AR_UNAT) // save ar.unat
366 st8 [r14]=r17,SW(AR_FPSR)-SW(CALLER_UNAT) // save caller_unat
369 st8 [r2]=r19,SW(AR_BSPSTORE)-SW(AR_RNAT) // save ar.rnat
370 st8 [r3]=r21 // save predicate registers
372 st8 [r2]=r20 // save ar.bspstore
373 st8 [r14]=r18 // save fpsr
374 mov ar.rsc=3 // put RSE back into eager mode, pl 0
376 END(save_switch_stack)
380 * - "invala" MUST be done at call site (normally in DO_LOAD_SWITCH_STACK)
381 * - b7 holds address to return to
382 * - must not touch r8-r11
384 GLOBAL_ENTRY(load_switch_stack)
389 lfetch.fault.nt1 [sp]
390 adds r2=SW(AR_BSPSTORE)+16,sp
391 adds r3=SW(AR_UNAT)+16,sp
392 mov ar.rsc=0 // put RSE into enforced lazy mode
393 adds r14=SW(CALLER_UNAT)+16,sp
394 adds r15=SW(AR_FPSR)+16,sp
396 ld8 r27=[r2],(SW(B0)-SW(AR_BSPSTORE)) // bspstore
397 ld8 r29=[r3],(SW(B1)-SW(AR_UNAT)) // unat
399 ld8 r21=[r2],16 // restore b0
400 ld8 r22=[r3],16 // restore b1
402 ld8 r23=[r2],16 // restore b2
403 ld8 r24=[r3],16 // restore b3
405 ld8 r25=[r2],16 // restore b4
406 ld8 r26=[r3],16 // restore b5
408 ld8 r16=[r2],(SW(PR)-SW(AR_PFS)) // ar.pfs
409 ld8 r17=[r3],(SW(AR_RNAT)-SW(AR_LC)) // ar.lc
411 ld8 r28=[r2] // restore pr
412 ld8 r30=[r3] // restore rnat
414 ld8 r18=[r14],16 // restore caller's unat
415 ld8 r19=[r15],24 // restore fpsr
423 ldf.fill f12=[r14],32
424 ldf.fill f13=[r15],32
426 ldf.fill f14=[r14],32
427 ldf.fill f15=[r15],32
429 ldf.fill f16=[r14],32
430 ldf.fill f17=[r15],32
432 ldf.fill f18=[r14],32
433 ldf.fill f19=[r15],32
436 ldf.fill f20=[r14],32
437 ldf.fill f21=[r15],32
440 ldf.fill f22=[r14],32
441 ldf.fill f23=[r15],32
445 mov ar.unat=r29 // establish unat holding the NaT bits for r4-r7
448 ldf.fill f24=[r14],32
449 ldf.fill f25=[r15],32
452 ldf.fill f26=[r14],32
453 ldf.fill f27=[r15],32
456 ldf.fill f28=[r14],32
457 ldf.fill f29=[r15],32
460 ldf.fill f30=[r14],32
461 ldf.fill f31=[r15],24
471 mov ar.unat=r18 // restore caller's unat
472 mov ar.rnat=r30 // must restore after bspstore but before rsc!
473 mov ar.fpsr=r19 // restore fpsr
474 mov ar.rsc=3 // put RSE back into eager mode, pl 0
476 END(load_switch_stack)
478 GLOBAL_ENTRY(prefetch_stack)
479 add r14 = -IA64_SWITCH_STACK_SIZE, sp
480 add r15 = IA64_TASK_THREAD_KSP_OFFSET, in0
482 ld8 r16 = [r15] // load next's stack pointer
483 lfetch.fault.excl [r14], 128
485 lfetch.fault.excl [r14], 128
486 lfetch.fault [r16], 128
488 lfetch.fault.excl [r14], 128
489 lfetch.fault [r16], 128
491 lfetch.fault.excl [r14], 128
492 lfetch.fault [r16], 128
494 lfetch.fault.excl [r14], 128
495 lfetch.fault [r16], 128
497 lfetch.fault [r16], 128
501 GLOBAL_ENTRY(kernel_execve)
502 mov r15=__NR_execve // put syscall number in place
503 break __BREAK_SYSCALL
508 mov r15=__NR_clone // put syscall number in place
509 break __BREAK_SYSCALL
514 * Invoke a system call, but do some tracing before and after the call.
515 * We MUST preserve the current register frame throughout this routine
516 * because some system calls (such as ia64_execve) directly
519 GLOBAL_ENTRY(ia64_trace_syscall)
520 PT_REGS_UNWIND_INFO(0)
522 * We need to preserve the scratch registers f6-f11 in case the system
525 adds r16=PT(F6)+16,sp
526 adds r17=PT(F7)+16,sp
528 stf.spill [r16]=f6,32
529 stf.spill [r17]=f7,32
531 stf.spill [r16]=f8,32
532 stf.spill [r17]=f9,32
536 br.call.sptk.many rp=syscall_trace_enter // give parent a chance to catch syscall args
537 cmp.lt p6,p0=r8,r0 // check tracehook
538 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
539 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
541 (p6) br.cond.sptk strace_error // syscall failed ->
542 adds r16=PT(F6)+16,sp
543 adds r17=PT(F7)+16,sp
553 // the syscall number may have changed, so re-load it and re-calculate the
554 // syscall entry-point:
555 adds r15=PT(R15)+16,sp // r15 = &pt_regs.r15 (syscall #)
558 mov r3=NR_syscalls - 1
561 movl r16=sys_call_table
563 shladd r20=r15,3,r16 // r20 = sys_call_table + 8*(syscall-1024)
566 (p6) ld8 r20=[r20] // load address of syscall entry point
567 (p7) movl r20=sys_ni_syscall
570 br.call.sptk.many rp=b6 // do the syscall
571 .strace_check_retval:
572 cmp.lt p6,p0=r8,r0 // syscall failed?
573 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
574 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
576 (p6) br.cond.sptk strace_error // syscall failed ->
577 ;; // avoid RAW on r10
579 .mem.offset 0,0; st8.spill [r2]=r8 // store return value in slot for r8
580 .mem.offset 8,0; st8.spill [r3]=r10 // clear error indication in slot for r10
581 br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
583 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
584 (pUStk) rsm psr.i // disable interrupts
585 br.cond.sptk ia64_work_pending_syscall_end
588 ld8 r3=[r2] // load pt_regs.r8
589 sub r9=0,r8 // negate return value to get errno value
591 cmp.ne p6,p0=r3,r0 // is pt_regs.r8!=0?
592 adds r3=16,r2 // r3=&pt_regs.r10
596 br.cond.sptk .strace_save_retval
597 END(ia64_trace_syscall)
600 * When traced and returning from sigreturn, we invoke syscall_trace but then
601 * go straight to ia64_leave_kernel rather than ia64_leave_syscall.
603 GLOBAL_ENTRY(ia64_strace_leave_kernel)
604 PT_REGS_UNWIND_INFO(0)
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.
611 br.call.sptk.many rp=syscall_trace_leave // give parent a chance to catch return value
613 .ret4: br.cond.sptk ia64_leave_kernel
614 END(ia64_strace_leave_kernel)
616 GLOBAL_ENTRY(ia64_ret_from_clone)
617 PT_REGS_UNWIND_INFO(0)
619 * Some versions of gas generate bad unwind info if the first instruction of a
620 * procedure doesn't go into the first slot of a bundle. This is a workaround.
625 * We need to call schedule_tail() to complete the scheduling process.
626 * Called by ia64_switch_to() after do_fork()->copy_thread(). r8 contains the
627 * address of the previously executing task.
629 br.call.sptk.many rp=ia64_invoke_schedule_tail
632 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
637 and r2=_TIF_SYSCALL_TRACEAUDIT,r2
640 (p6) br.cond.spnt .strace_check_retval
641 ;; // added stop bits to prevent r8 dependency
642 END(ia64_ret_from_clone)
644 GLOBAL_ENTRY(ia64_ret_from_syscall)
645 PT_REGS_UNWIND_INFO(0)
646 cmp.ge p6,p7=r8,r0 // syscall executed successfully?
647 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
648 mov r10=r0 // clear error indication in r10
649 (p7) br.cond.spnt handle_syscall_error // handle potential syscall failure
650 #ifdef CONFIG_PARAVIRT
652 br.cond.sptk.few ia64_leave_syscall
654 #endif /* CONFIG_PARAVIRT */
655 END(ia64_ret_from_syscall)
656 #ifndef CONFIG_PARAVIRT
659 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
662 * ia64_leave_syscall(): Same as ia64_leave_kernel, except that it doesn't
663 * need to switch to bank 0 and doesn't restore the scratch registers.
664 * To avoid leaking kernel bits, the scratch registers are set to
665 * the following known-to-be-safe values:
667 * r1: restored (global pointer)
669 * r3: 1 (when returning to user-level)
670 * r8-r11: restored (syscall return value(s))
671 * r12: restored (user-level stack pointer)
672 * r13: restored (user-level thread pointer)
673 * r14: set to __kernel_syscall_via_epc
674 * r15: restored (syscall #)
678 * r20: user-level ar.fpsr
681 * r23: user-level ar.bspstore
682 * r24: user-level ar.rnat
683 * r25: user-level ar.unat
684 * r26: user-level ar.pfs
685 * r27: user-level ar.rsc
687 * r29: user-level psr
688 * r30: user-level cfm
691 * pr: restored (user-level pr)
692 * b0: restored (user-level rp)
694 * b7: set to __kernel_syscall_via_epc
695 * ar.unat: restored (user-level ar.unat)
696 * ar.pfs: restored (user-level ar.pfs)
697 * ar.rsc: restored (user-level ar.rsc)
698 * ar.rnat: restored (user-level ar.rnat)
699 * ar.bspstore: restored (user-level ar.bspstore)
700 * ar.fpsr: restored (user-level ar.fpsr)
705 GLOBAL_ENTRY(__paravirt_leave_syscall)
706 PT_REGS_UNWIND_INFO(0)
708 * work.need_resched etc. mustn't get changed by this CPU before it returns to
709 * user- or fsys-mode, hence we disable interrupts early on.
711 * p6 controls whether current_thread_info()->flags needs to be check for
712 * extra work. We always check for extra work when returning to user-level.
713 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
714 * is 0. After extra work processing has been completed, execution
715 * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check
716 * needs to be redone.
718 #ifdef CONFIG_PREEMPT
719 RSM_PSR_I(p0, r2, r18) // disable interrupts
720 cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
721 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
723 .pred.rel.mutex pUStk,pKStk
724 (pKStk) ld4 r21=[r20] // r21 <- preempt_count
725 (pUStk) mov r21=0 // r21 <- 0
727 cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
728 #else /* !CONFIG_PREEMPT */
729 RSM_PSR_I(pUStk, r2, r18)
730 cmp.eq pLvSys,p0=r0,r0 // pLvSys=1: leave from syscall
731 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
733 .global __paravirt_work_processed_syscall;
734 __paravirt_work_processed_syscall:
735 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
736 adds r2=PT(LOADRS)+16,r12
737 (pUStk) mov.m r22=ar.itc // fetch time at leave
738 adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
740 (p6) ld4 r31=[r18] // load current_thread_info()->flags
741 ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
742 adds r3=PT(AR_BSPSTORE)+16,r12 // deferred
745 adds r2=PT(LOADRS)+16,r12
746 adds r3=PT(AR_BSPSTORE)+16,r12
747 adds r18=TI_FLAGS+IA64_TASK_SIZE,r13
749 (p6) ld4 r31=[r18] // load current_thread_info()->flags
750 ld8 r19=[r2],PT(B6)-PT(LOADRS) // load ar.rsc value for "loadrs"
754 mov r16=ar.bsp // M2 get existing backing store pointer
755 ld8 r18=[r2],PT(R9)-PT(B6) // load b6
756 (p6) and r15=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
758 ld8 r23=[r3],PT(R11)-PT(AR_BSPSTORE) // load ar.bspstore (may be garbage)
759 (p6) cmp4.ne.unc p6,p0=r15, r0 // any special work pending?
760 (p6) br.cond.spnt .work_pending_syscall
762 // start restoring the state saved on the kernel stack (struct pt_regs):
763 ld8 r9=[r2],PT(CR_IPSR)-PT(R9)
764 ld8 r11=[r3],PT(CR_IIP)-PT(R11)
765 (pNonSys) break 0 // bug check: we shouldn't be here if pNonSys is TRUE!
767 invala // M0|1 invalidate ALAT
768 RSM_PSR_I_IC(r28, r29, r30) // M2 turn off interrupts and interruption collection
769 cmp.eq p9,p0=r0,r0 // A set p9 to indicate that we should restore cr.ifs
771 ld8 r29=[r2],16 // M0|1 load cr.ipsr
772 ld8 r28=[r3],16 // M0|1 load cr.iip
773 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
774 (pUStk) add r14=TI_AC_LEAVE+IA64_TASK_SIZE,r13
776 ld8 r30=[r2],16 // M0|1 load cr.ifs
777 ld8 r25=[r3],16 // M0|1 load ar.unat
778 (pUStk) add r15=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
781 mov r22=r0 // A clear r22
783 ld8 r30=[r2],16 // M0|1 load cr.ifs
784 ld8 r25=[r3],16 // M0|1 load ar.unat
785 (pUStk) add r14=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
788 ld8 r26=[r2],PT(B0)-PT(AR_PFS) // M0|1 load ar.pfs
789 MOV_FROM_PSR(pKStk, r22, r21) // M2 read PSR now that interrupts are disabled
792 ld8 r21=[r2],PT(AR_RNAT)-PT(B0) // M0|1 load b0
793 ld8 r27=[r3],PT(PR)-PT(AR_RSC) // M0|1 load ar.rsc
794 mov f6=f0 // F clear f6
796 ld8 r24=[r2],PT(AR_FPSR)-PT(AR_RNAT) // M0|1 load ar.rnat (may be garbage)
797 ld8 r31=[r3],PT(R1)-PT(PR) // M0|1 load predicates
798 mov f7=f0 // F clear f7
800 ld8 r20=[r2],PT(R12)-PT(AR_FPSR) // M0|1 load ar.fpsr
801 ld8.fill r1=[r3],16 // M0|1 load r1
802 (pUStk) mov r17=1 // A
804 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
805 (pUStk) st1 [r15]=r17 // M2|3
807 (pUStk) st1 [r14]=r17 // M2|3
809 ld8.fill r13=[r3],16 // M0|1
810 mov f8=f0 // F clear f8
812 ld8.fill r12=[r2] // M0|1 restore r12 (sp)
813 ld8.fill r15=[r3] // M0|1 restore r15
814 mov b6=r18 // I0 restore b6
816 LOAD_PHYS_STACK_REG_SIZE(r17)
817 mov f9=f0 // F clear f9
818 (pKStk) br.cond.dpnt.many skip_rbs_switch // B
820 srlz.d // M0 ensure interruption collection is off (for cover)
821 shr.u r18=r19,16 // I0|1 get byte size of existing "dirty" partition
822 COVER // B add current frame into dirty partition & set cr.ifs
824 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
825 mov r19=ar.bsp // M2 get new backing store pointer
826 st8 [r14]=r22 // M save time at leave
827 mov f10=f0 // F clear f10
829 mov r22=r0 // A clear r22
830 movl r14=__kernel_syscall_via_epc // X
833 mov r19=ar.bsp // M2 get new backing store pointer
834 mov f10=f0 // F clear f10
837 movl r14=__kernel_syscall_via_epc // X
840 mov.m ar.csd=r0 // M2 clear ar.csd
841 mov.m ar.ccv=r0 // M2 clear ar.ccv
842 mov b7=r14 // I0 clear b7 (hint with __kernel_syscall_via_epc)
844 mov.m ar.ssd=r0 // M2 clear ar.ssd
845 mov f11=f0 // F clear f11
846 br.cond.sptk.many rbs_switch // B
847 END(__paravirt_leave_syscall)
849 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
850 #ifdef CONFIG_IA32_SUPPORT
851 GLOBAL_ENTRY(ia64_ret_from_ia32_execve)
852 PT_REGS_UNWIND_INFO(0)
853 adds r2=PT(R8)+16,sp // r2 = &pt_regs.r8
854 adds r3=PT(R10)+16,sp // r3 = &pt_regs.r10
857 st8.spill [r2]=r8 // store return value in slot for r8 and set unat bit
859 st8.spill [r3]=r0 // clear error indication in slot for r10 and set unat bit
860 #ifdef CONFIG_PARAVIRT
862 // don't fall through, ia64_leave_kernel may be #define'd
863 br.cond.sptk.few ia64_leave_kernel
865 #endif /* CONFIG_PARAVIRT */
866 END(ia64_ret_from_ia32_execve)
867 #ifndef CONFIG_PARAVIRT
870 #endif /* CONFIG_IA32_SUPPORT */
871 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
873 GLOBAL_ENTRY(__paravirt_leave_kernel)
874 PT_REGS_UNWIND_INFO(0)
876 * work.need_resched etc. mustn't get changed by this CPU before it returns to
877 * user- or fsys-mode, hence we disable interrupts early on.
879 * p6 controls whether current_thread_info()->flags needs to be check for
880 * extra work. We always check for extra work when returning to user-level.
881 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
882 * is 0. After extra work processing has been completed, execution
883 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
884 * needs to be redone.
886 #ifdef CONFIG_PREEMPT
887 RSM_PSR_I(p0, r17, r31) // disable interrupts
888 cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
889 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
891 .pred.rel.mutex pUStk,pKStk
892 (pKStk) ld4 r21=[r20] // r21 <- preempt_count
893 (pUStk) mov r21=0 // r21 <- 0
895 cmp.eq p6,p0=r21,r0 // p6 <- pUStk || (preempt_count == 0)
897 RSM_PSR_I(pUStk, r17, r31)
898 cmp.eq p0,pLvSys=r0,r0 // pLvSys=0: leave from kernel
899 (pUStk) cmp.eq.unc p6,p0=r0,r0 // p6 <- pUStk
901 .work_processed_kernel:
902 adds r17=TI_FLAGS+IA64_TASK_SIZE,r13
904 (p6) ld4 r31=[r17] // load current_thread_info()->flags
905 adds r21=PT(PR)+16,r12
908 lfetch [r21],PT(CR_IPSR)-PT(PR)
909 adds r2=PT(B6)+16,r12
910 adds r3=PT(R16)+16,r12
913 ld8 r28=[r2],8 // load b6
914 adds r29=PT(R24)+16,r12
916 ld8.fill r16=[r3],PT(AR_CSD)-PT(R16)
917 adds r30=PT(AR_CCV)+16,r12
918 (p6) and r19=TIF_WORK_MASK,r31 // any work other than TIF_SYSCALL_TRACE?
921 ld8 r15=[r30] // load ar.ccv
922 (p6) cmp4.ne.unc p6,p0=r19, r0 // any special work pending?
924 ld8 r29=[r2],16 // load b7
925 ld8 r30=[r3],16 // load ar.csd
926 (p6) br.cond.spnt .work_pending
928 ld8 r31=[r2],16 // load ar.ssd
932 ld8.fill r10=[r3],PT(R17)-PT(R10)
934 ld8.fill r11=[r2],PT(R18)-PT(R11)
945 RSM_PSR_I_IC(r23, r22, r25) // initiate turning off of interrupt and interruption collection
946 invala // invalidate ALAT
962 ld8.fill r31=[r2],PT(F9)-PT(R31)
963 adds r3=PT(F10)-PT(F6),r3
965 ldf.fill f9=[r2],PT(F6)-PT(F9)
966 ldf.fill f10=[r3],PT(F8)-PT(F10)
968 ldf.fill f6=[r2],PT(F7)-PT(F6)
970 ldf.fill f7=[r2],PT(F11)-PT(F7)
973 srlz.d // ensure that inter. collection is off (VHPT is don't care, since text is pinned)
977 BSW_0(r2, r3, r15) // switch back to bank 0 (no stop bit required beforehand...)
979 (pUStk) mov r18=IA64_KR(CURRENT)// M2 (12 cycle read latency)
980 adds r16=PT(CR_IPSR)+16,r12
981 adds r17=PT(CR_IIP)+16,r12
983 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
984 .pred.rel.mutex pUStk,pKStk
985 MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled
986 (pUStk) mov.m r22=ar.itc // M fetch time at leave
990 MOV_FROM_PSR(pKStk, r22, r29) // M2 read PSR now that interrupts are disabled
995 ld8 r29=[r16],16 // load cr.ipsr
996 ld8 r28=[r17],16 // load cr.iip
998 ld8 r30=[r16],16 // load cr.ifs
999 ld8 r25=[r17],16 // load ar.unat
1001 ld8 r26=[r16],16 // load ar.pfs
1002 ld8 r27=[r17],16 // load ar.rsc
1003 cmp.eq p9,p0=r0,r0 // set p9 to indicate that we should restore cr.ifs
1005 ld8 r24=[r16],16 // load ar.rnat (may be garbage)
1006 ld8 r23=[r17],16 // load ar.bspstore (may be garbage)
1008 ld8 r31=[r16],16 // load predicates
1009 ld8 r21=[r17],16 // load b0
1011 ld8 r19=[r16],16 // load ar.rsc value for "loadrs"
1012 ld8.fill r1=[r17],16 // load r1
1014 ld8.fill r12=[r16],16
1015 ld8.fill r13=[r17],16
1016 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1017 (pUStk) adds r3=TI_AC_LEAVE+IA64_TASK_SIZE,r18
1019 (pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18
1022 ld8 r20=[r16],16 // ar.fpsr
1023 ld8.fill r15=[r17],16
1024 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1025 (pUStk) adds r18=IA64_TASK_THREAD_ON_USTACK_OFFSET,r18 // deferred
1028 ld8.fill r14=[r16],16
1032 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
1033 // mmi_ : ld8 st1 shr;; mmi_ : st8 st1 shr;;
1034 // mib : mov add br -> mib : ld8 add br
1035 // bbb_ : br nop cover;; mbb_ : mov br cover;;
1037 // no one require bsp in r16 if (pKStk) branch is selected.
1038 (pUStk) st8 [r3]=r22 // save time at leave
1039 (pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
1040 shr.u r18=r19,16 // get byte size of existing "dirty" partition
1042 ld8.fill r3=[r16] // deferred
1043 LOAD_PHYS_STACK_REG_SIZE(r17)
1044 (pKStk) br.cond.dpnt skip_rbs_switch
1045 mov r16=ar.bsp // get existing backing store pointer
1048 (pUStk) st1 [r18]=r17 // restore current->thread.on_ustack
1049 shr.u r18=r19,16 // get byte size of existing "dirty" partition
1051 mov r16=ar.bsp // get existing backing store pointer
1052 LOAD_PHYS_STACK_REG_SIZE(r17)
1053 (pKStk) br.cond.dpnt skip_rbs_switch
1057 * Restore user backing store.
1059 * NOTE: alloc, loadrs, and cover can't be predicated.
1061 (pNonSys) br.cond.dpnt dont_preserve_current_frame
1062 COVER // add current frame into dirty partition and set cr.ifs
1064 mov r19=ar.bsp // get new backing store pointer
1066 sub r16=r16,r18 // krbs = old bsp - size of dirty partition
1067 cmp.ne p9,p0=r0,r0 // clear p9 to skip restore of cr.ifs
1069 sub r19=r19,r16 // calculate total byte size of dirty partition
1070 add r18=64,r18 // don't force in0-in7 into memory...
1072 shl r19=r19,16 // shift size of dirty partition into loadrs position
1074 dont_preserve_current_frame:
1076 * To prevent leaking bits between the kernel and user-space,
1077 * we must clear the stacked registers in the "invalid" partition here.
1078 * Not pretty, but at least it's fast (3.34 registers/cycle on Itanium,
1079 * 5 registers/cycle on McKinley).
1081 # define pRecurse p6
1083 #ifdef CONFIG_ITANIUM
1088 alloc loc0=ar.pfs,2,Nregs-2,2,0
1089 shr.u loc1=r18,9 // RNaTslots <= floor(dirtySize / (64*8))
1090 sub r17=r17,r18 // r17 = (physStackedSize + 8) - dirtySize
1092 mov ar.rsc=r19 // load ar.rsc to be used for "loadrs"
1093 shladd in0=loc1,3,r17
1098 #ifdef CONFIG_ITANIUM
1101 alloc loc0=ar.pfs,2,Nregs-2,2,0
1102 cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse
1103 add out0=-Nregs*8,in0
1105 add out1=1,in1 // increment recursion count
1107 nop.b 0 // can't do br.call here because of alloc (WAW on CFM)
1116 (pRecurse) br.call.sptk.many b0=rse_clear_invalid
1121 cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret
1125 (pReturn) br.ret.sptk.many b0
1127 #else /* !CONFIG_ITANIUM */
1128 alloc loc0=ar.pfs,2,Nregs-2,2,0
1129 cmp.lt pRecurse,p0=Nregs*8,in0 // if more than Nregs regs left to clear, (re)curse
1130 add out0=-Nregs*8,in0
1131 add out1=1,in1 // increment recursion count
1140 (pRecurse) br.call.dptk.few b0=rse_clear_invalid
1144 cmp.ne pReturn,p0=r0,in1 // if recursion count != 0, we need to do a br.ret
1147 (pReturn) br.ret.dptk.many b0
1148 #endif /* !CONFIG_ITANIUM */
1152 alloc r17=ar.pfs,0,0,0,0 // drop current register frame
1157 mov ar.unat=r25 // M2
1158 (pKStk) extr.u r22=r22,21,1 // I0 extract current value of psr.pp from r22
1159 (pLvSys)mov r19=r0 // A clear r19 for leave_syscall, no-op otherwise
1161 (pUStk) mov ar.bspstore=r23 // M2
1162 (pKStk) dep r29=r22,r29,21,1 // I0 update ipsr.pp with psr.pp
1163 (pLvSys)mov r16=r0 // A clear r16 for leave_syscall, no-op otherwise
1165 MOV_TO_IPSR(p0, r29, r25) // M2
1166 mov ar.pfs=r26 // I0
1167 (pLvSys)mov r17=r0 // A clear r17 for leave_syscall, no-op otherwise
1169 MOV_TO_IFS(p9, r30, r25)// M2
1171 (pLvSys)mov r18=r0 // A clear r18 for leave_syscall, no-op otherwise
1173 mov ar.fpsr=r20 // M2
1174 MOV_TO_IIP(r28, r25) // M2
1177 (pUStk) mov ar.rnat=r24 // M2 must happen with RSE in lazy mode
1181 mov ar.rsc=r27 // M2
1187 * r20 = ¤t->thread_info->pre_count (if CONFIG_PREEMPT)
1188 * r31 = current->thread_info->flags
1190 * p6 = TRUE if work-pending-check needs to be redone
1192 * Interrupts are disabled on entry, reenabled depend on work, and
1195 .work_pending_syscall:
1202 tbit.z p6,p0=r31,TIF_NEED_RESCHED // is resched not needed?
1203 (p6) br.cond.sptk.few .notify
1204 #ifdef CONFIG_PREEMPT
1205 (pKStk) dep r21=-1,r0,PREEMPT_ACTIVE_BIT,1
1207 (pKStk) st4 [r20]=r21
1209 SSM_PSR_I(p0, p6, r2) // enable interrupts
1210 br.call.spnt.many rp=schedule
1211 .ret9: cmp.eq p6,p0=r0,r0 // p6 <- 1 (re-check)
1212 RSM_PSR_I(p0, r2, r20) // disable interrupts
1214 #ifdef CONFIG_PREEMPT
1215 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
1217 (pKStk) st4 [r20]=r0 // preempt_count() <- 0
1219 (pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
1220 br.cond.sptk.many .work_processed_kernel
1223 (pUStk) br.call.spnt.many rp=notify_resume_user
1224 .ret10: cmp.ne p6,p0=r0,r0 // p6 <- 0 (don't re-check)
1225 (pLvSys)br.cond.sptk.few __paravirt_pending_syscall_end
1226 br.cond.sptk.many .work_processed_kernel
1228 .global __paravirt_pending_syscall_end;
1229 __paravirt_pending_syscall_end:
1230 adds r2=PT(R8)+16,r12
1231 adds r3=PT(R10)+16,r12
1235 br.cond.sptk.many __paravirt_work_processed_syscall_target
1236 END(__paravirt_leave_kernel)
1238 #ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
1239 ENTRY(handle_syscall_error)
1241 * Some system calls (e.g., ptrace, mmap) can return arbitrary values which could
1242 * lead us to mistake a negative return value as a failed syscall. Those syscall
1243 * must deposit a non-zero value in pt_regs.r8 to indicate an error. If
1244 * pt_regs.r8 is zero, we assume that the call completed successfully.
1246 PT_REGS_UNWIND_INFO(0)
1247 ld8 r3=[r2] // load pt_regs.r8
1249 cmp.eq p6,p7=r3,r0 // is pt_regs.r8==0?
1252 (p7) sub r8=0,r8 // negate return value to get errno
1253 br.cond.sptk ia64_leave_syscall
1254 END(handle_syscall_error)
1257 * Invoke schedule_tail(task) while preserving in0-in7, which may be needed
1258 * in case a system call gets restarted.
1260 GLOBAL_ENTRY(ia64_invoke_schedule_tail)
1261 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
1262 alloc loc1=ar.pfs,8,2,1,0
1264 mov out0=r8 // Address of previous task
1266 br.call.sptk.many rp=schedule_tail
1267 .ret11: mov ar.pfs=loc1
1270 END(ia64_invoke_schedule_tail)
1273 * Setup stack and call do_notify_resume_user(), keeping interrupts
1276 * Note that pSys and pNonSys need to be set up by the caller.
1277 * We declare 8 input registers so the system call args get preserved,
1278 * in case we need to restart a system call.
1280 GLOBAL_ENTRY(notify_resume_user)
1281 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8)
1282 alloc loc1=ar.pfs,8,2,3,0 // preserve all eight input regs in case of syscall restart!
1284 mov loc0=rp // save return address
1285 mov out0=0 // there is no "oldset"
1286 adds out1=8,sp // out1=&sigscratch->ar_pfs
1287 (pSys) mov out2=1 // out2==1 => we're in a syscall
1289 (pNonSys) mov out2=0 // out2==0 => not a syscall
1291 .spillsp ar.unat, 16
1292 st8 [sp]=r9,-16 // allocate space for ar.unat and save it
1293 st8 [out1]=loc1,-8 // save ar.pfs, out1=&sigscratch
1295 br.call.sptk.many rp=do_notify_resume_user
1297 adds sp=16,sp // pop scratch stack space
1299 ld8 r9=[sp] // load new unat from sigscratch->scratch_unat
1305 END(notify_resume_user)
1307 ENTRY(sys_rt_sigreturn)
1308 PT_REGS_UNWIND_INFO(0)
1310 * Allocate 8 input registers since ptrace() may clobber them
1312 alloc r2=ar.pfs,8,0,1,0
1317 cmp.eq pNonSys,pSys=r0,r0 // sigreturn isn't a normal syscall...
1320 * leave_kernel() restores f6-f11 from pt_regs, but since the streamlined
1321 * syscall-entry path does not save them we save them here instead. Note: we
1322 * don't need to save any other registers that are not saved by the stream-lined
1323 * syscall path, because restore_sigcontext() restores them.
1325 adds r16=PT(F6)+32,sp
1326 adds r17=PT(F7)+32,sp
1328 stf.spill [r16]=f6,32
1329 stf.spill [r17]=f7,32
1331 stf.spill [r16]=f8,32
1332 stf.spill [r17]=f9,32
1336 adds out0=16,sp // out0 = &sigscratch
1337 br.call.sptk.many rp=ia64_rt_sigreturn
1338 .ret19: .restore sp,0
1341 ld8 r9=[sp] // load new ar.unat
1342 mov.sptk b7=r8,ia64_native_leave_kernel
1346 END(sys_rt_sigreturn)
1348 GLOBAL_ENTRY(ia64_prepare_handle_unaligned)
1351 * r16 = fake ar.pfs, we simply need to make sure privilege is still 0
1354 DO_SAVE_SWITCH_STACK
1355 br.call.sptk.many rp=ia64_handle_unaligned // stack frame setup in ivt
1357 DO_LOAD_SWITCH_STACK
1358 br.cond.sptk.many rp // goes to ia64_leave_kernel
1359 END(ia64_prepare_handle_unaligned)
1362 // unw_init_running(void (*callback)(info, arg), void *arg)
1364 # define EXTRA_FRAME_SIZE ((UNW_FRAME_INFO_SIZE+15)&~15)
1366 GLOBAL_ENTRY(unw_init_running)
1367 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
1368 alloc loc1=ar.pfs,2,3,3,0
1373 DO_SAVE_SWITCH_STACK
1376 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
1377 .fframe IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE
1378 SWITCH_STACK_SAVES(EXTRA_FRAME_SIZE)
1379 adds sp=-EXTRA_FRAME_SIZE,sp
1382 adds out0=16,sp // &info
1383 mov out1=r13 // current
1384 adds out2=16+EXTRA_FRAME_SIZE,sp // &switch_stack
1385 br.call.sptk.many rp=unw_init_frame_info
1386 1: adds out0=16,sp // &info
1388 mov loc2=gp // save gp across indirect function call
1392 br.call.sptk.many rp=b6 // invoke the callback function
1393 1: mov gp=loc2 // restore gp
1395 // For now, we don't allow changing registers from within
1396 // unw_init_running; if we ever want to allow that, we'd
1397 // have to do a load_switch_stack here:
1399 adds sp=IA64_SWITCH_STACK_SIZE+EXTRA_FRAME_SIZE,sp
1404 END(unw_init_running)
1408 .globl sys_call_table
1410 data8 sys_ni_syscall // This must be sys_ni_syscall! See ivt.S.
1411 data8 sys_exit // 1025
1416 data8 sys_creat // 1030
1421 data8 sys_fchdir // 1035
1426 data8 sys_lseek // 1040
1431 data8 sys_setuid // 1045
1436 data8 sys_sync // 1050
1441 data8 sys_mkdir // 1055
1446 data8 ia64_brk // 1060
1451 data8 sys_ioctl // 1065
1456 data8 sys_dup2 // 1070
1461 data8 sys_getresgid // 1075
1466 data8 sys_setpgid // 1080
1469 data8 sys_sethostname
1471 data8 sys_getrlimit // 1085
1473 data8 sys_gettimeofday
1474 data8 sys_settimeofday
1476 data8 sys_poll // 1090
1481 data8 sys_swapoff // 1095
1486 data8 sys_fchown // 1100
1487 data8 ia64_getpriority
1488 data8 sys_setpriority
1491 data8 sys_gettid // 1105
1496 data8 sys_msgsnd // 1110
1501 data8 sys_shmdt // 1115
1506 data8 sys_ni_syscall // 1120 /* was: ia64_oldstat */
1507 data8 sys_ni_syscall /* was: ia64_oldlstat */
1508 data8 sys_ni_syscall /* was: ia64_oldfstat */
1511 data8 sys_remap_file_pages // 1125
1515 data8 sys_setdomainname
1516 data8 sys_newuname // 1130
1518 data8 sys_ni_syscall /* was: ia64_create_module */
1519 data8 sys_init_module
1520 data8 sys_delete_module
1521 data8 sys_ni_syscall // 1135 /* was: sys_get_kernel_syms */
1522 data8 sys_ni_syscall /* was: sys_query_module */
1526 data8 sys_personality // 1140
1527 data8 sys_ni_syscall // sys_afs_syscall
1531 data8 sys_flock // 1145
1536 data8 sys_sysctl // 1150
1541 data8 sys_mprotect // 1155
1545 data8 sys_munlockall
1546 data8 sys_sched_getparam // 1160
1547 data8 sys_sched_setparam
1548 data8 sys_sched_getscheduler
1549 data8 sys_sched_setscheduler
1550 data8 sys_sched_yield
1551 data8 sys_sched_get_priority_max // 1165
1552 data8 sys_sched_get_priority_min
1553 data8 sys_sched_rr_get_interval
1555 data8 sys_nfsservctl
1556 data8 sys_prctl // 1170
1557 data8 sys_getpagesize
1559 data8 sys_pciconfig_read
1560 data8 sys_pciconfig_write
1561 data8 sys_perfmonctl // 1175
1562 data8 sys_sigaltstack
1563 data8 sys_rt_sigaction
1564 data8 sys_rt_sigpending
1565 data8 sys_rt_sigprocmask
1566 data8 sys_rt_sigqueueinfo // 1180
1567 data8 sys_rt_sigreturn
1568 data8 sys_rt_sigsuspend
1569 data8 sys_rt_sigtimedwait
1571 data8 sys_capget // 1185
1573 data8 sys_sendfile64
1574 data8 sys_ni_syscall // sys_getpmsg (STREAMS)
1575 data8 sys_ni_syscall // sys_putpmsg (STREAMS)
1576 data8 sys_socket // 1190
1581 data8 sys_getsockname // 1195
1582 data8 sys_getpeername
1583 data8 sys_socketpair
1586 data8 sys_recv // 1200
1589 data8 sys_setsockopt
1590 data8 sys_getsockopt
1591 data8 sys_sendmsg // 1205
1593 data8 sys_pivot_root
1596 data8 sys_newstat // 1210
1600 data8 sys_getdents64
1601 data8 sys_getunwind // 1215
1606 data8 sys_getxattr // 1220
1610 data8 sys_llistxattr
1611 data8 sys_flistxattr // 1225
1612 data8 sys_removexattr
1613 data8 sys_lremovexattr
1614 data8 sys_fremovexattr
1616 data8 sys_futex // 1230
1617 data8 sys_sched_setaffinity
1618 data8 sys_sched_getaffinity
1619 data8 sys_set_tid_address
1620 data8 sys_fadvise64_64
1621 data8 sys_tgkill // 1235
1622 data8 sys_exit_group
1623 data8 sys_lookup_dcookie
1625 data8 sys_io_destroy
1626 data8 sys_io_getevents // 1240
1629 data8 sys_epoll_create
1631 data8 sys_epoll_wait // 1245
1632 data8 sys_restart_syscall
1633 data8 sys_semtimedop
1634 data8 sys_timer_create
1635 data8 sys_timer_settime
1636 data8 sys_timer_gettime // 1250
1637 data8 sys_timer_getoverrun
1638 data8 sys_timer_delete
1639 data8 sys_clock_settime
1640 data8 sys_clock_gettime
1641 data8 sys_clock_getres // 1255
1642 data8 sys_clock_nanosleep
1646 data8 sys_get_mempolicy // 1260
1647 data8 sys_set_mempolicy
1650 data8 sys_mq_timedsend
1651 data8 sys_mq_timedreceive // 1265
1653 data8 sys_mq_getsetattr
1654 data8 sys_kexec_load
1655 data8 sys_ni_syscall // reserved for vserver
1656 data8 sys_waitid // 1270
1658 data8 sys_request_key
1660 data8 sys_ioprio_set
1661 data8 sys_ioprio_get // 1275
1662 data8 sys_move_pages
1663 data8 sys_inotify_init
1664 data8 sys_inotify_add_watch
1665 data8 sys_inotify_rm_watch
1666 data8 sys_migrate_pages // 1280
1671 data8 sys_futimesat // 1285
1672 data8 sys_newfstatat
1676 data8 sys_symlinkat // 1290
1677 data8 sys_readlinkat
1681 data8 sys_ppoll // 1295
1684 data8 sys_set_robust_list
1685 data8 sys_get_robust_list
1686 data8 sys_sync_file_range // 1300
1691 data8 sys_epoll_pwait // 1305
1694 data8 sys_ni_syscall
1696 data8 sys_timerfd_create // 1310
1697 data8 sys_timerfd_settime
1698 data8 sys_timerfd_gettime
1701 data8 sys_epoll_create1 // 1315
1704 data8 sys_inotify_init1
1706 .org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls
1707 #endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */