mirror of
https://github.com/freebsd/freebsd-src
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e69dff491d
instead of a PCPU field for curthread. This averts a race on SMP systems with a high interrupt rate where the thread looking up the value of curthread could be preempted and migrated between obtaining the PCPU pointer and reading the value of pc_curthread, resulting in curthread being observed to be the current thread on the thread's original CPU. This played merry havoc with the system, in particular with mutexes. Many thanks to jhb for helping me work this one out. Note that Book-E is in principle susceptible to the same problem, but has not been modified yet due to lack of Book-E hardware. MFC after: 2 weeks
194 lines
5.3 KiB
ArmAsm
194 lines
5.3 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/spr.h>
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#include <machine/asm.h>
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/* Locate the per-CPU data structure */
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#define GET_CPUINFO(r) \
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mfsprg0 r
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/*
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* Compiled KERNBASE location and the kernel load address
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*/
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.globl kernbase
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.set kernbase, KERNBASE
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#define TMPSTKSZ 8192 /* 8K temporary stack */
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/*
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* Globals
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*/
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.data
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.align 4
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GLOBAL(tmpstk)
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.space TMPSTKSZ
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GLOBAL(esym)
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.long 0 /* end of symbol table */
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#define INTRCNT_COUNT 256 /* max(HROWPIC_IRQMAX,OPENPIC_IRQMAX) */
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GLOBAL(intrnames)
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.space INTRCNT_COUNT * (MAXCOMLEN + 1) * 2
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GLOBAL(eintrnames)
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.align 4
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GLOBAL(intrcnt)
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.space INTRCNT_COUNT * 4 * 2
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GLOBAL(eintrcnt)
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.text
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.globl btext
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btext:
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/*
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* This symbol is here for the benefit of kvm_mkdb, and is supposed to
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* mark the start of kernel text.
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*/
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.globl kernel_text
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kernel_text:
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/*
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* Startup entry. Note, this must be the first thing in the text
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* segment!
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*/
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.text
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.globl __start
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__start:
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li 8,0
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li 9,0x100
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mtctr 9
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1:
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dcbf 0,8
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icbi 0,8
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addi 8,8,0x20
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bdnz 1b
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sync
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isync
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/* Save the argument pointer and length */
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mr 20,6
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mr 21,7
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lis 8,openfirmware_entry@ha
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stw 5,openfirmware_entry@l(8) /* save client interface handler */
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lis 1,(tmpstk+TMPSTKSZ-16)@ha
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addi 1,1,(tmpstk+TMPSTKSZ-16)@l
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mfmsr 0
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lis 9,ofmsr@ha
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stwu 0,ofmsr@l(9)
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mfsprg0 0 /* save SPRG0-3 */
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stw 0,4(9) /* ofmsr[1] = sprg0 */
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mfsprg1 0
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stw 0,8(9) /* ofmsr[2] = sprg1 */
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mfsprg2 0
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stw 0,12(9) /* ofmsr[3] = sprg2 */
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mfsprg3 0
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stw 0,16(9) /* ofmsr[4] = sprg3 */
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bl OF_initial_setup
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lis 4,end@ha
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addi 4,4,end@l
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mr 5,4
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lis 3,kernel_text@ha
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addi 3,3,kernel_text@l
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/* Restore the argument pointer and length */
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mr 6,20
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mr 7,21
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bl powerpc_init
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mr %r1, %r3
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li %r3, 0
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stw %r3, 0(%r1)
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bl mi_startup
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b OF_exit
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/*
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* int setfault()
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*
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* Similar to setjmp to setup for handling faults on accesses to user memory.
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* Any routine using this may only call bcopy, either the form below,
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* or the (currently used) C code optimized, so it doesn't use any non-volatile
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* registers.
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*/
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.globl setfault
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setfault:
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mflr 0
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mfcr 12
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mfsprg 4,0
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lwz 4,TD_PCB(2) /* curthread = r2 */
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stw 3,PCB_ONFAULT(4)
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stw 0,0(3)
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stw 1,4(3)
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stw 2,8(3)
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stmw 12,12(3)
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xor 3,3,3
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blr
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#include <powerpc/aim/trap_subr32.S>
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