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-rw-r--r--arch/sparc/lib/VISsave.S144
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/sparc/lib/VISsave.S b/arch/sparc/lib/VISsave.S
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1/*
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
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