1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * VISsave.S: Code for saving FPU register sta
4 * VIS routines. One should not cal
5 * but use macros provided in <asm/
6 *
7 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.
8 */
9
10 #include <linux/export.h>
11 #include <linux/linkage.h>
12
13 #include <asm/asi.h>
14 #include <asm/page.h>
15 #include <asm/ptrace.h>
16 #include <asm/visasm.h>
17 #include <asm/thread_info.h>
18
19 /* On entry: %o5=current FPRS value, %
20 /* May clobber %o5, %g1, %g2, %g3, %g7
21
22 /* Nothing special need be done here t
23 * FPU save/restore mechanism is alrea
24 */
25 .text
26 .align 32
27 ENTRY(VISenter)
28 ldub [%g6 + TI_FPDEPTH], %g
29 brnz,a,pn %g1, 1f
30 cmp %g1, 1
31 stb %g0, [%g6 + TI_FPSAVED
32 stx %fsr, [%g6 + TI_XFSR]
33 9: jmpl %g7 + %g0, %g0
34 nop
35 1: bne,pn %icc, 2f
36
37 srl %g1, 1, %g1
38 vis1: ldub [%g6 + TI_FPSAVED], %g
39 stx %fsr, [%g6 + TI_XFSR]
40 or %g3, %o5, %g3
41 stb %g3, [%g6 + TI_FPSAVED
42 rd %gsr, %g3
43 clr %g1
44 ba,pt %xcc, 3f
45
46 stx %g3, [%g6 + TI_GSR]
47 2: add %g6, %g1, %g3
48 mov FPRS_DU | FPRS_DL | FP
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
58 3: andcc %o5, FPRS_DL|FPRS_DU,
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, %
65 membar #Sync
66 stda %f0, [%g2 + %g1] ASI_B
67 stda %f16, [%g3 + %g1] ASI_
68 membar #Sync
69 andcc %o5, FPRS_DU, %g0
70 be,pn %icc, 5f
71 4: add %g1, 128, %g1
72 membar #Sync
73 stda %f32, [%g2 + %g1] ASI_
74
75 stda %f48, [%g3 + %g1] ASI_
76 5: membar #Sync
77 ba,pt %xcc, 80f
78 nop
79
80 .align 32
81 80: jmpl %g7 + %g0, %g0
82 nop
83 ENDPROC(VISenter)
84 EXPORT_SYMBOL(VISenter)
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