1 /* $Id: VISsave.S,v 1.6 2002/02/09 19:49:30 davem Exp $
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>.
6 * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
11 #include <asm/ptrace.h>
12 #include <asm/visasm.h>
13 #include <asm/thread_info.h>
16 .globl VISenter, VISenterhalf
18 /* On entry: %o5=current FPRS value, %g7 is callers address */
19 /* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
21 /* Nothing special need be done here to handle pre-emption, this
22 * FPU save/restore mechanism is already preemption safe.
27 ldub [%g6 + TI_FPDEPTH], %g1
30 stb %g0, [%g6 + TI_FPSAVED]
31 stx %fsr, [%g6 + TI_XFSR]
32 9: jmpl %g7 + %g0, %g0
37 vis1: ldub [%g6 + TI_FPSAVED], %g3
38 stx %fsr, [%g6 + TI_XFSR]
40 stb %g3, [%g6 + TI_FPSAVED]
45 stx %g3, [%g6 + TI_GSR]
50 stb %o5, [%g3 + TI_FPSAVED]
53 stx %g2, [%g3 + TI_GSR]
56 stx %fsr, [%g2 + TI_XFSR]
58 3: andcc %o5, FPRS_DL|FPRS_DU, %g0
60 add %g6, TI_FPREGS, %g2
61 andcc %o5, FPRS_DL, %g0
62 membar #StoreStore | #LoadStore
65 add %g6, TI_FPREGS+0x40, %g3
66 stda %f0, [%g2 + %g1] ASI_BLK_P
67 stda %f16, [%g3 + %g1] ASI_BLK_P
68 andcc %o5, FPRS_DU, %g0
71 stda %f32, [%g2 + %g1] ASI_BLK_P
73 stda %f48, [%g3 + %g1] ASI_BLK_P
78 6: ldub [%g3 + TI_FPSAVED], %o5
80 add %g6, TI_FPREGS+0x80, %g2
81 stb %o5, [%g3 + TI_FPSAVED]
84 add %g6, TI_FPREGS+0xc0, %g3
85 wr %g0, FPRS_FEF, %fprs
86 membar #StoreStore | #LoadStore
87 stda %f32, [%g2 + %g1] ASI_BLK_P
88 stda %f48, [%g3 + %g1] ASI_BLK_P
96 ldub [%g6 + TI_FPDEPTH], %g1
99 stb %g0, [%g6 + TI_FPSAVED]
100 stx %fsr, [%g6 + TI_XFSR]
103 wr %g0, FPRS_FEF, %fprs
109 2: addcc %g6, %g1, %g3
111 andn %o5, FPRS_DU, %g2
112 stb %g2, [%g3 + TI_FPSAVED]
116 stx %g2, [%g3 + TI_GSR]
118 stx %fsr, [%g2 + TI_XFSR]
120 3: andcc %o5, FPRS_DL, %g0
122 add %g6, TI_FPREGS, %g2
124 membar #StoreStore | #LoadStore
125 add %g6, TI_FPREGS+0x40, %g3
126 stda %f0, [%g2 + %g1] ASI_BLK_P
127 stda %f16, [%g3 + %g1] ASI_BLK_P
129 4: and %o5, FPRS_DU, %o5
131 wr %o5, FPRS_FEF, %fprs