ba6399334d
We need to use stricter memory barriers around the block load and store instructions we use to save and restore the FPU register file. Signed-off-by: David S. Miller <davem@davemloft.net>
144 lines
2.9 KiB
ArmAsm
144 lines
2.9 KiB
ArmAsm
/* $Id: VISsave.S,v 1.6 2002/02/09 19:49:30 davem Exp $
|
|
* 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 <asm/asi.h>
|
|
#include <asm/page.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/visasm.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
.text
|
|
.globl VISenter, VISenterhalf
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
.align 32
|
|
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
|
|
cmp %o5, FPRS_DU
|
|
be,pn %icc, 6f
|
|
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
|
|
|
|
6: ldub [%g3 + TI_FPSAVED], %o5
|
|
or %o5, FPRS_DU, %o5
|
|
add %g6, TI_FPREGS+0x80, %g2
|
|
stb %o5, [%g3 + TI_FPSAVED]
|
|
|
|
sll %g1, 5, %g1
|
|
add %g6, TI_FPREGS+0xc0, %g3
|
|
wr %g0, FPRS_FEF, %fprs
|
|
membar #Sync
|
|
stda %f32, [%g2 + %g1] ASI_BLK_P
|
|
stda %f48, [%g3 + %g1] ASI_BLK_P
|
|
membar #Sync
|
|
ba,pt %xcc, 80f
|
|
nop
|
|
|
|
.align 32
|
|
80: jmpl %g7 + %g0, %g0
|
|
nop
|
|
|
|
.align 32
|
|
VISenterhalf:
|
|
ldub [%g6 + TI_FPDEPTH], %g1
|
|
brnz,a,pn %g1, 1f
|
|
cmp %g1, 1
|
|
stb %g0, [%g6 + TI_FPSAVED]
|
|
stx %fsr, [%g6 + TI_XFSR]
|
|
clr %o5
|
|
jmpl %g7 + %g0, %g0
|
|
wr %g0, FPRS_FEF, %fprs
|
|
|
|
1: bne,pn %icc, 2f
|
|
srl %g1, 1, %g1
|
|
ba,pt %xcc, vis1
|
|
sub %g7, 8, %g7
|
|
2: addcc %g6, %g1, %g3
|
|
sll %g1, 3, %g1
|
|
andn %o5, FPRS_DU, %g2
|
|
stb %g2, [%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, %g0
|
|
be,pn %icc, 4f
|
|
add %g6, TI_FPREGS, %g2
|
|
|
|
add %g6, TI_FPREGS+0x40, %g3
|
|
membar #Sync
|
|
stda %f0, [%g2 + %g1] ASI_BLK_P
|
|
stda %f16, [%g3 + %g1] ASI_BLK_P
|
|
membar #Sync
|
|
ba,pt %xcc, 4f
|
|
nop
|
|
|
|
.align 32
|
|
4: and %o5, FPRS_DU, %o5
|
|
jmpl %g7 + %g0, %g0
|
|
wr %o5, FPRS_FEF, %fprs
|