132 lines
2.3 KiB
ArmAsm
132 lines
2.3 KiB
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
||
|
|
/*
|
||
|
|
* Copyright 2015, Cyril Bur, IBM Corp.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "basic_asm.h"
|
||
|
|
#include "fpu_asm.h"
|
||
|
|
|
||
|
|
FUNC_START(check_fpu)
|
||
|
|
mr r4,r3
|
||
|
|
li r3,1 # assume a bad result
|
||
|
|
lfd f0,0(r4)
|
||
|
|
fcmpu cr1,f0,f14
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,8(r4)
|
||
|
|
fcmpu cr1,f0,f15
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,16(r4)
|
||
|
|
fcmpu cr1,f0,f16
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,24(r4)
|
||
|
|
fcmpu cr1,f0,f17
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,32(r4)
|
||
|
|
fcmpu cr1,f0,f18
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,40(r4)
|
||
|
|
fcmpu cr1,f0,f19
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,48(r4)
|
||
|
|
fcmpu cr1,f0,f20
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,56(r4)
|
||
|
|
fcmpu cr1,f0,f21
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,64(r4)
|
||
|
|
fcmpu cr1,f0,f22
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,72(r4)
|
||
|
|
fcmpu cr1,f0,f23
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,80(r4)
|
||
|
|
fcmpu cr1,f0,f24
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,88(r4)
|
||
|
|
fcmpu cr1,f0,f25
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,96(r4)
|
||
|
|
fcmpu cr1,f0,f26
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,104(r4)
|
||
|
|
fcmpu cr1,f0,f27
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,112(r4)
|
||
|
|
fcmpu cr1,f0,f28
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,120(r4)
|
||
|
|
fcmpu cr1,f0,f29
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,128(r4)
|
||
|
|
fcmpu cr1,f0,f30
|
||
|
|
bne cr1,1f
|
||
|
|
lfd f0,136(r4)
|
||
|
|
fcmpu cr1,f0,f31
|
||
|
|
bne cr1,1f
|
||
|
|
li r3,0 # Success!!!
|
||
|
|
1: blr
|
||
|
|
|
||
|
|
FUNC_START(test_fpu)
|
||
|
|
# r3 holds pointer to where to put the result of fork
|
||
|
|
# r4 holds pointer to the pid
|
||
|
|
# f14-f31 are non volatiles
|
||
|
|
PUSH_BASIC_STACK(256)
|
||
|
|
PUSH_FPU(256)
|
||
|
|
std r3,STACK_FRAME_PARAM(0)(sp) # Address of darray
|
||
|
|
std r4,STACK_FRAME_PARAM(1)(sp) # Address of pid
|
||
|
|
|
||
|
|
bl load_fpu
|
||
|
|
nop
|
||
|
|
li r0,__NR_fork
|
||
|
|
sc
|
||
|
|
|
||
|
|
# pass the result of the fork to the caller
|
||
|
|
ld r9,STACK_FRAME_PARAM(1)(sp)
|
||
|
|
std r3,0(r9)
|
||
|
|
|
||
|
|
ld r3,STACK_FRAME_PARAM(0)(sp)
|
||
|
|
bl check_fpu
|
||
|
|
nop
|
||
|
|
|
||
|
|
POP_FPU(256)
|
||
|
|
POP_BASIC_STACK(256)
|
||
|
|
blr
|
||
|
|
FUNC_END(test_fpu)
|
||
|
|
|
||
|
|
# int preempt_fpu(double *darray, int *threads_running, int *running)
|
||
|
|
# On starting will (atomically) decrement not_ready as a signal that the FPU
|
||
|
|
# has been loaded with darray. Will proceed to check the validity of the FPU
|
||
|
|
# registers while running is not zero.
|
||
|
|
FUNC_START(preempt_fpu)
|
||
|
|
PUSH_BASIC_STACK(256)
|
||
|
|
PUSH_FPU(256)
|
||
|
|
std r3,STACK_FRAME_PARAM(0)(sp) # double *darray
|
||
|
|
std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting
|
||
|
|
std r5,STACK_FRAME_PARAM(2)(sp) # int *running
|
||
|
|
|
||
|
|
bl load_fpu
|
||
|
|
nop
|
||
|
|
|
||
|
|
sync
|
||
|
|
# Atomic DEC
|
||
|
|
ld r3,STACK_FRAME_PARAM(1)(sp)
|
||
|
|
1: lwarx r4,0,r3
|
||
|
|
addi r4,r4,-1
|
||
|
|
stwcx. r4,0,r3
|
||
|
|
bne- 1b
|
||
|
|
|
||
|
|
2: ld r3,STACK_FRAME_PARAM(0)(sp)
|
||
|
|
bl check_fpu
|
||
|
|
nop
|
||
|
|
cmpdi r3,0
|
||
|
|
bne 3f
|
||
|
|
ld r4,STACK_FRAME_PARAM(2)(sp)
|
||
|
|
ld r5,0(r4)
|
||
|
|
cmpwi r5,0
|
||
|
|
bne 2b
|
||
|
|
|
||
|
|
3: POP_FPU(256)
|
||
|
|
POP_BASIC_STACK(256)
|
||
|
|
blr
|
||
|
|
FUNC_END(preempt_fpu)
|