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 */
  38
  39
  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>
  51
  52#include "minstate.h"
  53
  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	 */
  59ENTRY(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
  83
  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
 103END(ia64_execve)
 104
 105/*
 106 * sys_clone2(u64 flags, u64 ustack_base, u64 ustack_size, u64 parent_tidptr, u64 child_tidptr,
 107 *	      u64 tls)
 108 */
 109GLOBAL_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 = &regs
 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
 135END(sys_clone2)
 136
 137/*
 138 * sys_clone(u64 flags, u64 ustack_base, u64 parent_tidptr, u64 child_tidptr, u64 tls)
 139 *	Deprecated.  Use sys_clone2() instead.
 140 */
 141GLOBAL_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 = &regs
 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
 167END(sys_clone)
 168#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
 169
 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 */
 176GLOBAL_ENTRY(__paravirt_switch_to)
 177	.prologue
 178	alloc r16=ar.pfs,1,0,0,0
 179	DO_SAVE_SWITCH_STACK
 180	.body
 181
 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
 205
 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
 210
 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
 228END(__paravirt_switch_to)
 229
 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 */
 240
 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 */
 247GLOBAL_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
 295
 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
 362END(save_switch_stack)
 363
 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 */
 370GLOBAL_ENTRY(load_switch_stack)
 371	.prologue
 372	.altrp b7
 373
 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
 456
 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
 462END(load_switch_stack)
 463
 464GLOBAL_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
 485END(prefetch_stack)
 486
 487GLOBAL_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
 492END(kernel_execve)
 493
 494GLOBAL_ENTRY(clone)
 495	mov r15=__NR_clone			// put syscall number in place
 496	break __BREAK_SYSCALL
 497	br.ret.sptk.many rp
 498END(clone)
 499
 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	 */
 506GLOBAL_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
 573
 574strace_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
 584END(ia64_trace_syscall)
 585
 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	 */
 590GLOBAL_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
 601END(ia64_strace_leave_kernel)
 602
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 603GLOBAL_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
 629END(ia64_ret_from_clone)
 630	// fall through
 631GLOBAL_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 */
 642END(ia64_ret_from_syscall)
 643#ifndef CONFIG_PARAVIRT
 644	// fall through
 645#endif
 646#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */
 647
 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 */
 692GLOBAL_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
 757
 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
 802
 803	LOAD_PHYS_STACK_REG_SIZE(r17)
 804	mov f9=f0					// F    clear f9
 805(pKStk) br.cond.dpnt.many skip_rbs_switch		// B
 806
 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
 815
 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
 822
 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)
 830
 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
 834END(__paravirt_leave_syscall)
 835
 836GLOBAL_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	;;
 870
 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
 878
 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
 945
 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
1018
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
1028rbs_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	;;
1037dont_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)
1060rse_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
1080
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	;;
1119skip_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
1131
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
1135
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
1143
1144	mov ar.rsc=r27		// M2
1145	mov pr=r31,-1		// I0
1146	RFI			// B
1147
1148	/*
1149	 * On entry:
1150	 *	r20 = &current->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
1184
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
1190
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
1199END(__paravirt_leave_kernel)
1200
1201#ifdef __IA64_ASM_PARAVIRTUALIZED_NATIVE
1202ENTRY(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
1217END(handle_syscall_error)
1218
1219	/*
1220	 * Invoke schedule_tail(task) while preserving in0-in7, which may be needed
1221	 * in case a system call gets restarted.
1222	 */
1223GLOBAL_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
1233END(ia64_invoke_schedule_tail)
1234
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	 */
1243GLOBAL_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
1268END(notify_resume_user)
1269
1270ENTRY(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
1309END(sys_rt_sigreturn)
1310
1311GLOBAL_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
1322END(ia64_prepare_handle_unaligned)
1323
1324	//
1325	// unw_init_running(void (*callback)(info, arg), void *arg)
1326	//
1327#	define EXTRA_FRAME_SIZE	((UNW_FRAME_INFO_SIZE+15)&~15)
1328
1329GLOBAL_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
1338
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
13491:	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
13561:	mov gp=loc2				// restore gp
1357
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
1363
1364	mov ar.pfs=loc1
1365	mov rp=loc0
1366	br.ret.sptk.many rp
1367END(unw_init_running)
1368
1369#ifdef CONFIG_FUNCTION_TRACER
1370#ifdef CONFIG_DYNAMIC_FTRACE
1371GLOBAL_ENTRY(_mcount)
1372	br ftrace_stub
1373END(_mcount)
1374
1375.here:
1376	br.ret.sptk.many b0
1377
1378GLOBAL_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
1387ftrace_patch_gp:
1388	movl gp=__gp
1389	mov b0 = r3
1390	;;
1391.global ftrace_call;
1392ftrace_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
1408
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	;;
1417END(ftrace_caller)
1418
1419#else
1420GLOBAL_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	;;
1428
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
1439
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	;;
1448END(_mcount)
1449#endif
1450
1451GLOBAL_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
1458
1459_mcount_ret_helper:
1460	mov b0 = r42
1461	mov r1 = r41
1462	mov ar.pfs = r40
1463	br b7
1464END(ftrace_stub)
1465
1466#endif /* CONFIG_FUNCTION_TRACER */
1467
1468	.rodata
1469	.align 8
1470	.globl sys_call_table
1471sys_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_ni_syscall			// old 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
1771	data8 sys_fanotify_init
1772	data8 sys_fanotify_mark
1773	data8 sys_prlimit64			// 1325
1774	data8 sys_name_to_handle_at
1775	data8 sys_open_by_handle_at
1776	data8 sys_clock_adjtime
1777	data8 sys_syncfs
1778	data8 sys_setns				// 1330
1779	data8 sys_sendmmsg
 
 
 
 
 
 
 
1780
1781	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
1782#endif /* __IA64_ASM_PARAVIRTUALIZED_NATIVE */