f86c114f3d
and save/restore during a context switch. The USER_SR could be overwritten when the current thread was switched out with a faulting copyin/copyout. Approved by: Benno
162 lines
5.5 KiB
ArmAsm
162 lines
5.5 KiB
ArmAsm
/* $FreeBSD$ */
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/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
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/*
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* Copyright (C) 2001 Benno Rice
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "assym.s"
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#include <sys/syscall.h>
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#include <machine/trap.h>
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#include <machine/param.h>
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#include <machine/sr.h>
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#include <machine/psl.h>
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#include <machine/asm.h>
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/*
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* void cpu_switch()
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* Find a runnable thread and switch to it.
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*/
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ENTRY(cpu_switch)
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mfsprg %r3,0 /* Get the pcpu pointer */
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lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */
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lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */
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mr %r12,%r2
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stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
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mr %r14,%r3 /* Copy the current pcb pointer */
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mr %r15,%r4 /* ... and the curthread pointer */
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mfcr %r16 /* Save the condition register */
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stw %r16,PCB_CR(%r3)
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mflr %r16 /* Save the link register */
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stw %r16,PCB_LR(%r3)
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mfsr %r16,USER_SR /* Save USER_SR for copyin/out */
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isync
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stw %r16,PCB_USR(%r3)
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stw %r1,PCB_SP(%r3) /* Save the stack pointer */
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#if 0
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lwz %r29,PCB_FLAGS(%r3)
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andi. %r9, %r29, 1 /* XXX - don't hard code */
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beq .L1
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bl save_fpu
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#endif
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.L1:
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bl choosethread /* Find a new thread to run */
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cmplw 0,%r3,%r15 /* Compare to curthread */
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beq .L2 /* If it's the same, we're done */
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mr %r16,%r3 /* Save off the (struct thread *) */
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mr %r3,%r15
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bl pmap_deactivate /* Deactivate the current pmap */
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mr %r3,%r16
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bl pmap_activate /* Activate the new address space */
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mfsprg %r4,0 /* Get the pcpu pointer */
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stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */
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mr %r3,%r16 /* and save in r3 */
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lwz %r16,TD_PCB(%r16) /* Store new current PCB */
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stw %r16,PC_CURPCB(%r4)
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#if 0
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lwz %r29, PCB_FLAGS(%r4) /* Restore FPU regs if needed */
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andi. %r9, %r29, 1
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beq .L2
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mr %r3, %r4
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bl enable_fpu
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#endif
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/* thread to restore is in r3 */
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.L2:
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lwz %r3, TD_PCB(%r3)
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lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
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mr %r2,%r12
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lwz %r5,PCB_CR(%r3) /* Load the condition register */
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mtcr %r5
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lwz %r5,PCB_LR(%r3) /* Load the link register */
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mtlr %r5
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lwz %r5,PCB_USR(%r3) /* Load the USER_SR segment reg */
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mtsr USER_SR,%r5
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isync
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lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
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blr
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/*
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* savectx(pcb)
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* Update pcb, saving current processor state
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*/
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ENTRY(savectx)
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mr %r12,%r2
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stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
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mfcr %r4 /* Save the condition register */
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stw %r4,PCB_CONTEXT(%r3)
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blr
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/*
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* fork_trampoline()
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* Set up the return from cpu_fork()
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*/
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ENTRY(fork_trampoline)
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lwz %r3,CF_FUNC(%r1)
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lwz %r4,CF_ARG0(%r1)
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lwz %r5,CF_ARG1(%r1)
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bl fork_exit
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addi %r1,%r1,4
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b trapexit
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