1/* $Id: VISsave.S,v 1.1.1.1 2007-08-03 18:52:18 $
2 * VISsave.S: Code for saving FPU register state for
3 *            VIS routines. One should not call this directly,
4 *            but use macros provided in <asm/visasm.h>.
5 *
6 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
7 */
8
9#include <asm/asi.h>
10#include <asm/page.h>
11#include <asm/ptrace.h>
12#include <asm/visasm.h>
13#include <asm/thread_info.h>
14
15	.text
16	.globl		VISenter, VISenterhalf
17
18	/* On entry: %o5=current FPRS value, %g7 is callers address */
19	/* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
20
21	/* Nothing special need be done here to handle pre-emption, this
22	 * FPU save/restore mechanism is already preemption safe.
23	 */
24
25	.align		32
26VISenter:
27	ldub		[%g6 + TI_FPDEPTH], %g1
28	brnz,a,pn	%g1, 1f
29	 cmp		%g1, 1
30	stb		%g0, [%g6 + TI_FPSAVED]
31	stx		%fsr, [%g6 + TI_XFSR]
329:	jmpl		%g7 + %g0, %g0
33	 nop
341:	bne,pn		%icc, 2f
35
36	 srl		%g1, 1, %g1
37vis1:	ldub		[%g6 + TI_FPSAVED], %g3
38	stx		%fsr, [%g6 + TI_XFSR]
39	or		%g3, %o5, %g3
40	stb		%g3, [%g6 + TI_FPSAVED]
41	rd		%gsr, %g3
42	clr		%g1
43	ba,pt		%xcc, 3f
44
45	 stx		%g3, [%g6 + TI_GSR]
462:	add		%g6, %g1, %g3
47	cmp		%o5, FPRS_DU
48	be,pn		%icc, 6f
49	 sll		%g1, 3, %g1
50	stb		%o5, [%g3 + TI_FPSAVED]
51	rd		%gsr, %g2
52	add		%g6, %g1, %g3
53	stx		%g2, [%g3 + TI_GSR]
54
55	add		%g6, %g1, %g2
56	stx		%fsr, [%g2 + TI_XFSR]
57	sll		%g1, 5, %g1
583:	andcc		%o5, FPRS_DL|FPRS_DU, %g0
59	be,pn		%icc, 9b
60	 add		%g6, TI_FPREGS, %g2
61	andcc		%o5, FPRS_DL, %g0
62
63	be,pn		%icc, 4f
64	 add		%g6, TI_FPREGS+0x40, %g3
65	membar		#Sync
66	stda		%f0, [%g2 + %g1] ASI_BLK_P
67	stda		%f16, [%g3 + %g1] ASI_BLK_P
68	membar		#Sync
69	andcc		%o5, FPRS_DU, %g0
70	be,pn		%icc, 5f
714:	 add		%g1, 128, %g1
72	membar		#Sync
73	stda		%f32, [%g2 + %g1] ASI_BLK_P
74
75	stda		%f48, [%g3 + %g1] ASI_BLK_P
765:	membar		#Sync
77	ba,pt		%xcc, 80f
78	 nop
79
80	.align		32
8180:	jmpl		%g7 + %g0, %g0
82	 nop
83
846:	ldub		[%g3 + TI_FPSAVED], %o5
85	or		%o5, FPRS_DU, %o5
86	add		%g6, TI_FPREGS+0x80, %g2
87	stb		%o5, [%g3 + TI_FPSAVED]
88
89	sll		%g1, 5, %g1
90	add		%g6, TI_FPREGS+0xc0, %g3
91	wr		%g0, FPRS_FEF, %fprs
92	membar		#Sync
93	stda		%f32, [%g2 + %g1] ASI_BLK_P
94	stda		%f48, [%g3 + %g1] ASI_BLK_P
95	membar		#Sync
96	ba,pt		%xcc, 80f
97	 nop
98
99	.align		32
10080:	jmpl		%g7 + %g0, %g0
101	 nop
102
103	.align		32
104VISenterhalf:
105	ldub		[%g6 + TI_FPDEPTH], %g1
106	brnz,a,pn	%g1, 1f
107	 cmp		%g1, 1
108	stb		%g0, [%g6 + TI_FPSAVED]
109	stx		%fsr, [%g6 + TI_XFSR]
110	clr		%o5
111	jmpl		%g7 + %g0, %g0
112	 wr		%g0, FPRS_FEF, %fprs
113
1141:	bne,pn		%icc, 2f
115	 srl		%g1, 1, %g1
116	ba,pt		%xcc, vis1
117	 sub		%g7, 8, %g7
1182:	addcc		%g6, %g1, %g3
119	sll		%g1, 3, %g1
120	andn		%o5, FPRS_DU, %g2
121	stb		%g2, [%g3 + TI_FPSAVED]
122
123	rd		%gsr, %g2
124	add		%g6, %g1, %g3
125	stx		%g2, [%g3 + TI_GSR]
126	add		%g6, %g1, %g2
127	stx		%fsr, [%g2 + TI_XFSR]
128	sll		%g1, 5, %g1
1293:	andcc		%o5, FPRS_DL, %g0
130	be,pn		%icc, 4f
131	 add		%g6, TI_FPREGS, %g2
132
133	add		%g6, TI_FPREGS+0x40, %g3
134	membar		#Sync
135	stda		%f0, [%g2 + %g1] ASI_BLK_P
136	stda		%f16, [%g3 + %g1] ASI_BLK_P
137	membar		#Sync
138	ba,pt		%xcc, 4f
139	 nop
140
141	.align		32
1424:	and		%o5, FPRS_DU, %o5
143	jmpl		%g7 + %g0, %g0
144	 wr		%o5, FPRS_FEF, %fprs
145