a29355a07b
switches. Not as lazy as it could be. Changing FPU state with sigcontext
still TODO.
fpu.c - convert some asm to inline C, and macroize fpu loads/stores
swtch.S - call out to save/restore fpu routines
trap.c - always call enable_fpu, since this shouldn't be called once
the FPU has been enabled for a thread
genassym.c - define for pcb fpu flag
159 lines
5.5 KiB
ArmAsm
159 lines
5.5 KiB
ArmAsm
/* $FreeBSD$ */
|
|
/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 2001 Benno Rice
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
/*
|
|
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
|
|
* Copyright (C) 1995, 1996 TooLs GmbH.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by TooLs GmbH.
|
|
* 4. The name of TooLs GmbH may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
|
|
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
|
|
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "assym.s"
|
|
|
|
#include <sys/syscall.h>
|
|
|
|
#include <machine/trap.h>
|
|
#include <machine/param.h>
|
|
#include <machine/sr.h>
|
|
#include <machine/psl.h>
|
|
#include <machine/asm.h>
|
|
|
|
/*
|
|
* void cpu_switch()
|
|
* Find a runnable thread and switch to it.
|
|
*/
|
|
ENTRY(cpu_switch)
|
|
mfsprg %r3,0 /* Get the pcpu pointer */
|
|
lwz %r4,PC_CURTHREAD(%r3) /* Get the current thread */
|
|
lwz %r3,TD_PCB(%r4) /* Get a pointer to the PCB */
|
|
|
|
mr %r12,%r2
|
|
stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
|
|
mr %r14,%r3 /* Copy the current pcb pointer */
|
|
mr %r15,%r4 /* ... and the curthread pointer */
|
|
mfcr %r16 /* Save the condition register */
|
|
stw %r16,PCB_CR(%r3)
|
|
mflr %r16 /* Save the link register */
|
|
stw %r16,PCB_LR(%r3)
|
|
mfsr %r16,USER_SR /* Save USER_SR for copyin/out */
|
|
isync
|
|
stw %r16,PCB_USR(%r3)
|
|
stw %r1,PCB_SP(%r3) /* Save the stack pointer */
|
|
|
|
lwz %r5,PCB_FLAGS(%r3) /* Save FPU context if needed */
|
|
andi. %r5, %r5, PCB_FPU
|
|
beq .L1
|
|
mr %r3,%r15
|
|
bl save_fpu
|
|
|
|
.L1:
|
|
bl choosethread /* Find a new thread to run */
|
|
cmplw 0,%r3,%r15 /* Compare to curthread */
|
|
beq .L2 /* If it's the same, we're done */
|
|
|
|
mr %r16,%r3 /* Save off the (struct thread *) */
|
|
|
|
mr %r3,%r15
|
|
bl pmap_deactivate /* Deactivate the current pmap */
|
|
|
|
mr %r3,%r16
|
|
bl pmap_activate /* Activate the new address space */
|
|
|
|
mfsprg %r4,0 /* Get the pcpu pointer */
|
|
stw %r16,PC_CURTHREAD(%r4) /* Store new current thread */
|
|
mr %r3,%r16 /* and save in r3 */
|
|
lwz %r17,TD_PCB(%r16) /* Store new current PCB */
|
|
stw %r17,PC_CURPCB(%r4)
|
|
|
|
lwz %r5, PCB_FLAGS(%r17) /* Restore FPU context if needed */
|
|
andi. %r5, %r5, PCB_FPU
|
|
beq .L2
|
|
bl enable_fpu
|
|
mr %r3,%r16 /* Recover new curthread */
|
|
|
|
/* thread to restore is in r3 */
|
|
.L2:
|
|
lwz %r3, TD_PCB(%r3)
|
|
lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
|
|
mr %r2,%r12
|
|
lwz %r5,PCB_CR(%r3) /* Load the condition register */
|
|
mtcr %r5
|
|
lwz %r5,PCB_LR(%r3) /* Load the link register */
|
|
mtlr %r5
|
|
lwz %r5,PCB_USR(%r3) /* Load the USER_SR segment reg */
|
|
mtsr USER_SR,%r5
|
|
isync
|
|
lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
|
|
blr
|
|
|
|
/*
|
|
* savectx(pcb)
|
|
* Update pcb, saving current processor state
|
|
*/
|
|
ENTRY(savectx)
|
|
mr %r12,%r2
|
|
stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
|
|
mfcr %r4 /* Save the condition register */
|
|
stw %r4,PCB_CONTEXT(%r3)
|
|
blr
|
|
|
|
/*
|
|
* fork_trampoline()
|
|
* Set up the return from cpu_fork()
|
|
*/
|
|
ENTRY(fork_trampoline)
|
|
lwz %r3,CF_FUNC(%r1)
|
|
lwz %r4,CF_ARG0(%r1)
|
|
lwz %r5,CF_ARG1(%r1)
|
|
bl fork_exit
|
|
addi %r1,%r1,4
|
|
b trapexit
|