xref: /linux/arch/powerpc/lib/copyuser_power7.S (revision 1517d90cfafe0f95fd7863d04e1596f7beb7dfa8) 
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *
4 * Copyright (C) IBM Corporation, 2011
5 *
6 * Author: Anton Blanchard <anton@au.ibm.com>
7 */
8#include <asm/ppc_asm.h>
9
10#ifndef SELFTEST_CASE
11/* 0 == don't use VMX, 1 == use VMX */
12#define SELFTEST_CASE	0
13#endif
14
15#ifdef __BIG_ENDIAN__
16#define LVS(VRT,RA,RB)		lvsl	VRT,RA,RB
17#define VPERM(VRT,VRA,VRB,VRC)	vperm	VRT,VRA,VRB,VRC
18#else
19#define LVS(VRT,RA,RB)		lvsr	VRT,RA,RB
20#define VPERM(VRT,VRA,VRB,VRC)	vperm	VRT,VRB,VRA,VRC
21#endif
22
23	.macro err1
24100:
25	EX_TABLE(100b,.Ldo_err1)
26	.endm
27
28	.macro err2
29200:
30	EX_TABLE(200b,.Ldo_err2)
31	.endm
32
33#ifdef CONFIG_ALTIVEC
34	.macro err3
35300:
36	EX_TABLE(300b,.Ldo_err3)
37	.endm
38
39	.macro err4
40400:
41	EX_TABLE(400b,.Ldo_err4)
42	.endm
43
44
45.Ldo_err4:
46	ld	r16,STK_REG(R16)(r1)
47	ld	r15,STK_REG(R15)(r1)
48	ld	r14,STK_REG(R14)(r1)
49.Ldo_err3:
50	bl	exit_vmx_usercopy
51	ld	r0,STACKFRAMESIZE+16(r1)
52	mtlr	r0
53	b	.Lexit
54#endif /* CONFIG_ALTIVEC */
55
56.Ldo_err2:
57	ld	r22,STK_REG(R22)(r1)
58	ld	r21,STK_REG(R21)(r1)
59	ld	r20,STK_REG(R20)(r1)
60	ld	r19,STK_REG(R19)(r1)
61	ld	r18,STK_REG(R18)(r1)
62	ld	r17,STK_REG(R17)(r1)
63	ld	r16,STK_REG(R16)(r1)
64	ld	r15,STK_REG(R15)(r1)
65	ld	r14,STK_REG(R14)(r1)
66.Lexit:
67	addi	r1,r1,STACKFRAMESIZE
68.Ldo_err1:
69	ld	r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
70	ld	r4,-STACKFRAMESIZE+STK_REG(R30)(r1)
71	ld	r5,-STACKFRAMESIZE+STK_REG(R29)(r1)
72	b	__copy_tofrom_user_base
73
74
75_GLOBAL(__copy_tofrom_user_power7)
76	cmpldi	r5,16
77	cmpldi	cr1,r5,3328
78
79	std	r3,-STACKFRAMESIZE+STK_REG(R31)(r1)
80	std	r4,-STACKFRAMESIZE+STK_REG(R30)(r1)
81	std	r5,-STACKFRAMESIZE+STK_REG(R29)(r1)
82
83	blt	.Lshort_copy
84
85#ifdef CONFIG_ALTIVEC
86test_feature = SELFTEST_CASE
87BEGIN_FTR_SECTION
88	bgt	cr1,.Lvmx_copy
89END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
90#endif
91
92.Lnonvmx_copy:
93	/* Get the source 8B aligned */
94	neg	r6,r4
95	mtocrf	0x01,r6
96	clrldi	r6,r6,(64-3)
97
98	bf	cr7*4+3,1f
99err1;	lbz	r0,0(r4)
100	addi	r4,r4,1
101err1;	stb	r0,0(r3)
102	addi	r3,r3,1
103
1041:	bf	cr7*4+2,2f
105err1;	lhz	r0,0(r4)
106	addi	r4,r4,2
107err1;	sth	r0,0(r3)
108	addi	r3,r3,2
109
1102:	bf	cr7*4+1,3f
111err1;	lwz	r0,0(r4)
112	addi	r4,r4,4
113err1;	stw	r0,0(r3)
114	addi	r3,r3,4
115
1163:	sub	r5,r5,r6
117	cmpldi	r5,128
118	blt	5f
119
120	mflr	r0
121	stdu	r1,-STACKFRAMESIZE(r1)
122	std	r14,STK_REG(R14)(r1)
123	std	r15,STK_REG(R15)(r1)
124	std	r16,STK_REG(R16)(r1)
125	std	r17,STK_REG(R17)(r1)
126	std	r18,STK_REG(R18)(r1)
127	std	r19,STK_REG(R19)(r1)
128	std	r20,STK_REG(R20)(r1)
129	std	r21,STK_REG(R21)(r1)
130	std	r22,STK_REG(R22)(r1)
131	std	r0,STACKFRAMESIZE+16(r1)
132
133	srdi	r6,r5,7
134	mtctr	r6
135
136	/* Now do cacheline (128B) sized loads and stores. */
137	.align	5
1384:
139err2;	ld	r0,0(r4)
140err2;	ld	r6,8(r4)
141err2;	ld	r7,16(r4)
142err2;	ld	r8,24(r4)
143err2;	ld	r9,32(r4)
144err2;	ld	r10,40(r4)
145err2;	ld	r11,48(r4)
146err2;	ld	r12,56(r4)
147err2;	ld	r14,64(r4)
148err2;	ld	r15,72(r4)
149err2;	ld	r16,80(r4)
150err2;	ld	r17,88(r4)
151err2;	ld	r18,96(r4)
152err2;	ld	r19,104(r4)
153err2;	ld	r20,112(r4)
154err2;	ld	r21,120(r4)
155	addi	r4,r4,128
156err2;	std	r0,0(r3)
157err2;	std	r6,8(r3)
158err2;	std	r7,16(r3)
159err2;	std	r8,24(r3)
160err2;	std	r9,32(r3)
161err2;	std	r10,40(r3)
162err2;	std	r11,48(r3)
163err2;	std	r12,56(r3)
164err2;	std	r14,64(r3)
165err2;	std	r15,72(r3)
166err2;	std	r16,80(r3)
167err2;	std	r17,88(r3)
168err2;	std	r18,96(r3)
169err2;	std	r19,104(r3)
170err2;	std	r20,112(r3)
171err2;	std	r21,120(r3)
172	addi	r3,r3,128
173	bdnz	4b
174
175	clrldi	r5,r5,(64-7)
176
177	ld	r14,STK_REG(R14)(r1)
178	ld	r15,STK_REG(R15)(r1)
179	ld	r16,STK_REG(R16)(r1)
180	ld	r17,STK_REG(R17)(r1)
181	ld	r18,STK_REG(R18)(r1)
182	ld	r19,STK_REG(R19)(r1)
183	ld	r20,STK_REG(R20)(r1)
184	ld	r21,STK_REG(R21)(r1)
185	ld	r22,STK_REG(R22)(r1)
186	addi	r1,r1,STACKFRAMESIZE
187
188	/* Up to 127B to go */
1895:	srdi	r6,r5,4
190	mtocrf	0x01,r6
191
1926:	bf	cr7*4+1,7f
193err1;	ld	r0,0(r4)
194err1;	ld	r6,8(r4)
195err1;	ld	r7,16(r4)
196err1;	ld	r8,24(r4)
197err1;	ld	r9,32(r4)
198err1;	ld	r10,40(r4)
199err1;	ld	r11,48(r4)
200err1;	ld	r12,56(r4)
201	addi	r4,r4,64
202err1;	std	r0,0(r3)
203err1;	std	r6,8(r3)
204err1;	std	r7,16(r3)
205err1;	std	r8,24(r3)
206err1;	std	r9,32(r3)
207err1;	std	r10,40(r3)
208err1;	std	r11,48(r3)
209err1;	std	r12,56(r3)
210	addi	r3,r3,64
211
212	/* Up to 63B to go */
2137:	bf	cr7*4+2,8f
214err1;	ld	r0,0(r4)
215err1;	ld	r6,8(r4)
216err1;	ld	r7,16(r4)
217err1;	ld	r8,24(r4)
218	addi	r4,r4,32
219err1;	std	r0,0(r3)
220err1;	std	r6,8(r3)
221err1;	std	r7,16(r3)
222err1;	std	r8,24(r3)
223	addi	r3,r3,32
224
225	/* Up to 31B to go */
2268:	bf	cr7*4+3,9f
227err1;	ld	r0,0(r4)
228err1;	ld	r6,8(r4)
229	addi	r4,r4,16
230err1;	std	r0,0(r3)
231err1;	std	r6,8(r3)
232	addi	r3,r3,16
233
2349:	clrldi	r5,r5,(64-4)
235
236	/* Up to 15B to go */
237.Lshort_copy:
238	mtocrf	0x01,r5
239	bf	cr7*4+0,12f
240err1;	lwz	r0,0(r4)	/* Less chance of a reject with word ops */
241err1;	lwz	r6,4(r4)
242	addi	r4,r4,8
243err1;	stw	r0,0(r3)
244err1;	stw	r6,4(r3)
245	addi	r3,r3,8
246
24712:	bf	cr7*4+1,13f
248err1;	lwz	r0,0(r4)
249	addi	r4,r4,4
250err1;	stw	r0,0(r3)
251	addi	r3,r3,4
252
25313:	bf	cr7*4+2,14f
254err1;	lhz	r0,0(r4)
255	addi	r4,r4,2
256err1;	sth	r0,0(r3)
257	addi	r3,r3,2
258
25914:	bf	cr7*4+3,15f
260err1;	lbz	r0,0(r4)
261err1;	stb	r0,0(r3)
262
26315:	li	r3,0
264	blr
265
266.Lunwind_stack_nonvmx_copy:
267	addi	r1,r1,STACKFRAMESIZE
268	b	.Lnonvmx_copy
269
270.Lvmx_copy:
271#ifdef CONFIG_ALTIVEC
272	mflr	r0
273	std	r0,16(r1)
274	stdu	r1,-STACKFRAMESIZE(r1)
275	bl	enter_vmx_usercopy
276	cmpwi	cr1,r3,0
277	ld	r0,STACKFRAMESIZE+16(r1)
278	ld	r3,STK_REG(R31)(r1)
279	ld	r4,STK_REG(R30)(r1)
280	ld	r5,STK_REG(R29)(r1)
281	mtlr	r0
282
283	/*
284	 * We prefetch both the source and destination using enhanced touch
285	 * instructions. We use a stream ID of 0 for the load side and
286	 * 1 for the store side.
287	 */
288	clrrdi	r6,r4,7
289	clrrdi	r9,r3,7
290	ori	r9,r9,1		/* stream=1 */
291
292	srdi	r7,r5,7		/* length in cachelines, capped at 0x3FF */
293	cmpldi	r7,0x3FF
294	ble	1f
295	li	r7,0x3FF
2961:	lis	r0,0x0E00	/* depth=7 */
297	sldi	r7,r7,7
298	or	r7,r7,r0
299	ori	r10,r7,1	/* stream=1 */
300
301	lis	r8,0x8000	/* GO=1 */
302	clrldi	r8,r8,32
303
304	/* setup read stream 0 */
305	dcbt	0,r6,0b01000   /* addr from */
306	dcbt	0,r7,0b01010   /* length and depth from */
307	/* setup write stream 1 */
308	dcbtst	0,r9,0b01000   /* addr to */
309	dcbtst	0,r10,0b01010  /* length and depth to */
310	eieio
311	dcbt	0,r8,0b01010	/* all streams GO */
312
313	beq	cr1,.Lunwind_stack_nonvmx_copy
314
315	/*
316	 * If source and destination are not relatively aligned we use a
317	 * slower permute loop.
318	 */
319	xor	r6,r4,r3
320	rldicl.	r6,r6,0,(64-4)
321	bne	.Lvmx_unaligned_copy
322
323	/* Get the destination 16B aligned */
324	neg	r6,r3
325	mtocrf	0x01,r6
326	clrldi	r6,r6,(64-4)
327
328	bf	cr7*4+3,1f
329err3;	lbz	r0,0(r4)
330	addi	r4,r4,1
331err3;	stb	r0,0(r3)
332	addi	r3,r3,1
333
3341:	bf	cr7*4+2,2f
335err3;	lhz	r0,0(r4)
336	addi	r4,r4,2
337err3;	sth	r0,0(r3)
338	addi	r3,r3,2
339
3402:	bf	cr7*4+1,3f
341err3;	lwz	r0,0(r4)
342	addi	r4,r4,4
343err3;	stw	r0,0(r3)
344	addi	r3,r3,4
345
3463:	bf	cr7*4+0,4f
347err3;	ld	r0,0(r4)
348	addi	r4,r4,8
349err3;	std	r0,0(r3)
350	addi	r3,r3,8
351
3524:	sub	r5,r5,r6
353
354	/* Get the desination 128B aligned */
355	neg	r6,r3
356	srdi	r7,r6,4
357	mtocrf	0x01,r7
358	clrldi	r6,r6,(64-7)
359
360	li	r9,16
361	li	r10,32
362	li	r11,48
363
364	bf	cr7*4+3,5f
365err3;	lvx	v1,0,r4
366	addi	r4,r4,16
367err3;	stvx	v1,0,r3
368	addi	r3,r3,16
369
3705:	bf	cr7*4+2,6f
371err3;	lvx	v1,0,r4
372err3;	lvx	v0,r4,r9
373	addi	r4,r4,32
374err3;	stvx	v1,0,r3
375err3;	stvx	v0,r3,r9
376	addi	r3,r3,32
377
3786:	bf	cr7*4+1,7f
379err3;	lvx	v3,0,r4
380err3;	lvx	v2,r4,r9
381err3;	lvx	v1,r4,r10
382err3;	lvx	v0,r4,r11
383	addi	r4,r4,64
384err3;	stvx	v3,0,r3
385err3;	stvx	v2,r3,r9
386err3;	stvx	v1,r3,r10
387err3;	stvx	v0,r3,r11
388	addi	r3,r3,64
389
3907:	sub	r5,r5,r6
391	srdi	r6,r5,7
392
393	std	r14,STK_REG(R14)(r1)
394	std	r15,STK_REG(R15)(r1)
395	std	r16,STK_REG(R16)(r1)
396
397	li	r12,64
398	li	r14,80
399	li	r15,96
400	li	r16,112
401
402	mtctr	r6
403
404	/*
405	 * Now do cacheline sized loads and stores. By this stage the
406	 * cacheline stores are also cacheline aligned.
407	 */
408	.align	5
4098:
410err4;	lvx	v7,0,r4
411err4;	lvx	v6,r4,r9
412err4;	lvx	v5,r4,r10
413err4;	lvx	v4,r4,r11
414err4;	lvx	v3,r4,r12
415err4;	lvx	v2,r4,r14
416err4;	lvx	v1,r4,r15
417err4;	lvx	v0,r4,r16
418	addi	r4,r4,128
419err4;	stvx	v7,0,r3
420err4;	stvx	v6,r3,r9
421err4;	stvx	v5,r3,r10
422err4;	stvx	v4,r3,r11
423err4;	stvx	v3,r3,r12
424err4;	stvx	v2,r3,r14
425err4;	stvx	v1,r3,r15
426err4;	stvx	v0,r3,r16
427	addi	r3,r3,128
428	bdnz	8b
429
430	ld	r14,STK_REG(R14)(r1)
431	ld	r15,STK_REG(R15)(r1)
432	ld	r16,STK_REG(R16)(r1)
433
434	/* Up to 127B to go */
435	clrldi	r5,r5,(64-7)
436	srdi	r6,r5,4
437	mtocrf	0x01,r6
438
439	bf	cr7*4+1,9f
440err3;	lvx	v3,0,r4
441err3;	lvx	v2,r4,r9
442err3;	lvx	v1,r4,r10
443err3;	lvx	v0,r4,r11
444	addi	r4,r4,64
445err3;	stvx	v3,0,r3
446err3;	stvx	v2,r3,r9
447err3;	stvx	v1,r3,r10
448err3;	stvx	v0,r3,r11
449	addi	r3,r3,64
450
4519:	bf	cr7*4+2,10f
452err3;	lvx	v1,0,r4
453err3;	lvx	v0,r4,r9
454	addi	r4,r4,32
455err3;	stvx	v1,0,r3
456err3;	stvx	v0,r3,r9
457	addi	r3,r3,32
458
45910:	bf	cr7*4+3,11f
460err3;	lvx	v1,0,r4
461	addi	r4,r4,16
462err3;	stvx	v1,0,r3
463	addi	r3,r3,16
464
465	/* Up to 15B to go */
46611:	clrldi	r5,r5,(64-4)
467	mtocrf	0x01,r5
468	bf	cr7*4+0,12f
469err3;	ld	r0,0(r4)
470	addi	r4,r4,8
471err3;	std	r0,0(r3)
472	addi	r3,r3,8
473
47412:	bf	cr7*4+1,13f
475err3;	lwz	r0,0(r4)
476	addi	r4,r4,4
477err3;	stw	r0,0(r3)
478	addi	r3,r3,4
479
48013:	bf	cr7*4+2,14f
481err3;	lhz	r0,0(r4)
482	addi	r4,r4,2
483err3;	sth	r0,0(r3)
484	addi	r3,r3,2
485
48614:	bf	cr7*4+3,15f
487err3;	lbz	r0,0(r4)
488err3;	stb	r0,0(r3)
489
49015:	addi	r1,r1,STACKFRAMESIZE
491	b	exit_vmx_usercopy	/* tail call optimise */
492
493.Lvmx_unaligned_copy:
494	/* Get the destination 16B aligned */
495	neg	r6,r3
496	mtocrf	0x01,r6
497	clrldi	r6,r6,(64-4)
498
499	bf	cr7*4+3,1f
500err3;	lbz	r0,0(r4)
501	addi	r4,r4,1
502err3;	stb	r0,0(r3)
503	addi	r3,r3,1
504
5051:	bf	cr7*4+2,2f
506err3;	lhz	r0,0(r4)
507	addi	r4,r4,2
508err3;	sth	r0,0(r3)
509	addi	r3,r3,2
510
5112:	bf	cr7*4+1,3f
512err3;	lwz	r0,0(r4)
513	addi	r4,r4,4
514err3;	stw	r0,0(r3)
515	addi	r3,r3,4
516
5173:	bf	cr7*4+0,4f
518err3;	lwz	r0,0(r4)	/* Less chance of a reject with word ops */
519err3;	lwz	r7,4(r4)
520	addi	r4,r4,8
521err3;	stw	r0,0(r3)
522err3;	stw	r7,4(r3)
523	addi	r3,r3,8
524
5254:	sub	r5,r5,r6
526
527	/* Get the desination 128B aligned */
528	neg	r6,r3
529	srdi	r7,r6,4
530	mtocrf	0x01,r7
531	clrldi	r6,r6,(64-7)
532
533	li	r9,16
534	li	r10,32
535	li	r11,48
536
537	LVS(v16,0,r4)		/* Setup permute control vector */
538err3;	lvx	v0,0,r4
539	addi	r4,r4,16
540
541	bf	cr7*4+3,5f
542err3;	lvx	v1,0,r4
543	VPERM(v8,v0,v1,v16)
544	addi	r4,r4,16
545err3;	stvx	v8,0,r3
546	addi	r3,r3,16
547	vor	v0,v1,v1
548
5495:	bf	cr7*4+2,6f
550err3;	lvx	v1,0,r4
551	VPERM(v8,v0,v1,v16)
552err3;	lvx	v0,r4,r9
553	VPERM(v9,v1,v0,v16)
554	addi	r4,r4,32
555err3;	stvx	v8,0,r3
556err3;	stvx	v9,r3,r9
557	addi	r3,r3,32
558
5596:	bf	cr7*4+1,7f
560err3;	lvx	v3,0,r4
561	VPERM(v8,v0,v3,v16)
562err3;	lvx	v2,r4,r9
563	VPERM(v9,v3,v2,v16)
564err3;	lvx	v1,r4,r10
565	VPERM(v10,v2,v1,v16)
566err3;	lvx	v0,r4,r11
567	VPERM(v11,v1,v0,v16)
568	addi	r4,r4,64
569err3;	stvx	v8,0,r3
570err3;	stvx	v9,r3,r9
571err3;	stvx	v10,r3,r10
572err3;	stvx	v11,r3,r11
573	addi	r3,r3,64
574
5757:	sub	r5,r5,r6
576	srdi	r6,r5,7
577
578	std	r14,STK_REG(R14)(r1)
579	std	r15,STK_REG(R15)(r1)
580	std	r16,STK_REG(R16)(r1)
581
582	li	r12,64
583	li	r14,80
584	li	r15,96
585	li	r16,112
586
587	mtctr	r6
588
589	/*
590	 * Now do cacheline sized loads and stores. By this stage the
591	 * cacheline stores are also cacheline aligned.
592	 */
593	.align	5
5948:
595err4;	lvx	v7,0,r4
596	VPERM(v8,v0,v7,v16)
597err4;	lvx	v6,r4,r9
598	VPERM(v9,v7,v6,v16)
599err4;	lvx	v5,r4,r10
600	VPERM(v10,v6,v5,v16)
601err4;	lvx	v4,r4,r11
602	VPERM(v11,v5,v4,v16)
603err4;	lvx	v3,r4,r12
604	VPERM(v12,v4,v3,v16)
605err4;	lvx	v2,r4,r14
606	VPERM(v13,v3,v2,v16)
607err4;	lvx	v1,r4,r15
608	VPERM(v14,v2,v1,v16)
609err4;	lvx	v0,r4,r16
610	VPERM(v15,v1,v0,v16)
611	addi	r4,r4,128
612err4;	stvx	v8,0,r3
613err4;	stvx	v9,r3,r9
614err4;	stvx	v10,r3,r10
615err4;	stvx	v11,r3,r11
616err4;	stvx	v12,r3,r12
617err4;	stvx	v13,r3,r14
618err4;	stvx	v14,r3,r15
619err4;	stvx	v15,r3,r16
620	addi	r3,r3,128
621	bdnz	8b
622
623	ld	r14,STK_REG(R14)(r1)
624	ld	r15,STK_REG(R15)(r1)
625	ld	r16,STK_REG(R16)(r1)
626
627	/* Up to 127B to go */
628	clrldi	r5,r5,(64-7)
629	srdi	r6,r5,4
630	mtocrf	0x01,r6
631
632	bf	cr7*4+1,9f
633err3;	lvx	v3,0,r4
634	VPERM(v8,v0,v3,v16)
635err3;	lvx	v2,r4,r9
636	VPERM(v9,v3,v2,v16)
637err3;	lvx	v1,r4,r10
638	VPERM(v10,v2,v1,v16)
639err3;	lvx	v0,r4,r11
640	VPERM(v11,v1,v0,v16)
641	addi	r4,r4,64
642err3;	stvx	v8,0,r3
643err3;	stvx	v9,r3,r9
644err3;	stvx	v10,r3,r10
645err3;	stvx	v11,r3,r11
646	addi	r3,r3,64
647
6489:	bf	cr7*4+2,10f
649err3;	lvx	v1,0,r4
650	VPERM(v8,v0,v1,v16)
651err3;	lvx	v0,r4,r9
652	VPERM(v9,v1,v0,v16)
653	addi	r4,r4,32
654err3;	stvx	v8,0,r3
655err3;	stvx	v9,r3,r9
656	addi	r3,r3,32
657
65810:	bf	cr7*4+3,11f
659err3;	lvx	v1,0,r4
660	VPERM(v8,v0,v1,v16)
661	addi	r4,r4,16
662err3;	stvx	v8,0,r3
663	addi	r3,r3,16
664
665	/* Up to 15B to go */
66611:	clrldi	r5,r5,(64-4)
667	addi	r4,r4,-16	/* Unwind the +16 load offset */
668	mtocrf	0x01,r5
669	bf	cr7*4+0,12f
670err3;	lwz	r0,0(r4)	/* Less chance of a reject with word ops */
671err3;	lwz	r6,4(r4)
672	addi	r4,r4,8
673err3;	stw	r0,0(r3)
674err3;	stw	r6,4(r3)
675	addi	r3,r3,8
676
67712:	bf	cr7*4+1,13f
678err3;	lwz	r0,0(r4)
679	addi	r4,r4,4
680err3;	stw	r0,0(r3)
681	addi	r3,r3,4
682
68313:	bf	cr7*4+2,14f
684err3;	lhz	r0,0(r4)
685	addi	r4,r4,2
686err3;	sth	r0,0(r3)
687	addi	r3,r3,2
688
68914:	bf	cr7*4+3,15f
690err3;	lbz	r0,0(r4)
691err3;	stb	r0,0(r3)
692
69315:	addi	r1,r1,STACKFRAMESIZE
694	b	exit_vmx_usercopy	/* tail call optimise */
695#endif /* CONFIG_ALTIVEC */
696