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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * VISsave.S: Code for saving FPU register state for
| * VIS routines. One should not call this directly,
| * but use macros provided in <asm/visasm.h>.
| *
| * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
| */
|
| #include <linux/linkage.h>
|
| #include <asm/asi.h>
| #include <asm/page.h>
| #include <asm/ptrace.h>
| #include <asm/visasm.h>
| #include <asm/thread_info.h>
| #include <asm/export.h>
|
| /* On entry: %o5=current FPRS value, %g7 is callers address */
| /* May clobber %o5, %g1, %g2, %g3, %g7, %icc, %xcc */
|
| /* Nothing special need be done here to handle pre-emption, this
| * FPU save/restore mechanism is already preemption safe.
| */
| .text
| .align 32
| ENTRY(VISenter)
| ldub [%g6 + TI_FPDEPTH], %g1
| brnz,a,pn %g1, 1f
| cmp %g1, 1
| stb %g0, [%g6 + TI_FPSAVED]
| stx %fsr, [%g6 + TI_XFSR]
| 9: jmpl %g7 + %g0, %g0
| nop
| 1: bne,pn %icc, 2f
|
| srl %g1, 1, %g1
| vis1: ldub [%g6 + TI_FPSAVED], %g3
| stx %fsr, [%g6 + TI_XFSR]
| or %g3, %o5, %g3
| stb %g3, [%g6 + TI_FPSAVED]
| rd %gsr, %g3
| clr %g1
| ba,pt %xcc, 3f
|
| stx %g3, [%g6 + TI_GSR]
| 2: add %g6, %g1, %g3
| mov FPRS_DU | FPRS_DL | FPRS_FEF, %o5
| sll %g1, 3, %g1
| stb %o5, [%g3 + TI_FPSAVED]
| rd %gsr, %g2
| add %g6, %g1, %g3
| stx %g2, [%g3 + TI_GSR]
|
| add %g6, %g1, %g2
| stx %fsr, [%g2 + TI_XFSR]
| sll %g1, 5, %g1
| 3: andcc %o5, FPRS_DL|FPRS_DU, %g0
| be,pn %icc, 9b
| add %g6, TI_FPREGS, %g2
| andcc %o5, FPRS_DL, %g0
|
| be,pn %icc, 4f
| add %g6, TI_FPREGS+0x40, %g3
| membar #Sync
| stda %f0, [%g2 + %g1] ASI_BLK_P
| stda %f16, [%g3 + %g1] ASI_BLK_P
| membar #Sync
| andcc %o5, FPRS_DU, %g0
| be,pn %icc, 5f
| 4: add %g1, 128, %g1
| membar #Sync
| stda %f32, [%g2 + %g1] ASI_BLK_P
|
| stda %f48, [%g3 + %g1] ASI_BLK_P
| 5: membar #Sync
| ba,pt %xcc, 80f
| nop
|
| .align 32
| 80: jmpl %g7 + %g0, %g0
| nop
| ENDPROC(VISenter)
| EXPORT_SYMBOL(VISenter)
|
|
