2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
131 lines
2.3 KiB
ArmAsm
131 lines
2.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright 2015, Cyril Bur, IBM Corp.
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*/
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#include "basic_asm.h"
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#include "fpu_asm.h"
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FUNC_START(check_fpu)
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mr r4,r3
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li r3,1 # assume a bad result
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lfd f0,0(r4)
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fcmpu cr1,f0,f14
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bne cr1,1f
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lfd f0,8(r4)
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fcmpu cr1,f0,f15
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bne cr1,1f
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lfd f0,16(r4)
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fcmpu cr1,f0,f16
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bne cr1,1f
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lfd f0,24(r4)
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fcmpu cr1,f0,f17
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bne cr1,1f
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lfd f0,32(r4)
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fcmpu cr1,f0,f18
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bne cr1,1f
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lfd f0,40(r4)
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fcmpu cr1,f0,f19
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bne cr1,1f
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lfd f0,48(r4)
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fcmpu cr1,f0,f20
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bne cr1,1f
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lfd f0,56(r4)
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fcmpu cr1,f0,f21
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bne cr1,1f
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lfd f0,64(r4)
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fcmpu cr1,f0,f22
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bne cr1,1f
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lfd f0,72(r4)
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fcmpu cr1,f0,f23
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bne cr1,1f
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lfd f0,80(r4)
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fcmpu cr1,f0,f24
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bne cr1,1f
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lfd f0,88(r4)
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fcmpu cr1,f0,f25
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bne cr1,1f
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lfd f0,96(r4)
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fcmpu cr1,f0,f26
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bne cr1,1f
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lfd f0,104(r4)
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fcmpu cr1,f0,f27
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bne cr1,1f
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lfd f0,112(r4)
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fcmpu cr1,f0,f28
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bne cr1,1f
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lfd f0,120(r4)
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fcmpu cr1,f0,f29
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bne cr1,1f
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lfd f0,128(r4)
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fcmpu cr1,f0,f30
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bne cr1,1f
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lfd f0,136(r4)
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fcmpu cr1,f0,f31
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bne cr1,1f
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li r3,0 # Success!!!
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1: blr
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FUNC_START(test_fpu)
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# r3 holds pointer to where to put the result of fork
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# r4 holds pointer to the pid
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# f14-f31 are non volatiles
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PUSH_BASIC_STACK(256)
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PUSH_FPU(256)
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std r3,STACK_FRAME_PARAM(0)(sp) # Address of darray
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std r4,STACK_FRAME_PARAM(1)(sp) # Address of pid
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bl load_fpu
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nop
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li r0,__NR_fork
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sc
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# pass the result of the fork to the caller
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ld r9,STACK_FRAME_PARAM(1)(sp)
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std r3,0(r9)
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ld r3,STACK_FRAME_PARAM(0)(sp)
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bl check_fpu
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nop
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POP_FPU(256)
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POP_BASIC_STACK(256)
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blr
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FUNC_END(test_fpu)
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# int preempt_fpu(double *darray, int *threads_running, int *running)
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# On starting will (atomically) decrement not_ready as a signal that the FPU
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# has been loaded with darray. Will proceed to check the validity of the FPU
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# registers while running is not zero.
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FUNC_START(preempt_fpu)
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PUSH_BASIC_STACK(256)
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PUSH_FPU(256)
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std r3,STACK_FRAME_PARAM(0)(sp) # double *darray
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std r4,STACK_FRAME_PARAM(1)(sp) # int *threads_starting
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std r5,STACK_FRAME_PARAM(2)(sp) # int *running
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bl load_fpu
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nop
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sync
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# Atomic DEC
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ld r3,STACK_FRAME_PARAM(1)(sp)
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1: lwarx r4,0,r3
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addi r4,r4,-1
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stwcx. r4,0,r3
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bne- 1b
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2: ld r3,STACK_FRAME_PARAM(0)(sp)
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bl check_fpu
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nop
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cmpdi r3,0
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bne 3f
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ld r4,STACK_FRAME_PARAM(2)(sp)
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ld r5,0(r4)
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cmpwi r5,0
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bne 2b
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3: POP_FPU(256)
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POP_BASIC_STACK(256)
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blr
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FUNC_END(preempt_fpu)
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