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Tip revision: a8750ddca918032d6349adbf9a4b6555e7db20da authored by Linus Torvalds on 14 January 2018, 23:32:30 UTC
Linux 4.15-rc8
Linux 4.15-rc8
Tip revision: a8750dd
VISsave.S
/* 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)