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sun4c hardware reports faults by the atomic load/store instructions as

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read faults even if the problem was that the memory was read-only.
detect this case and relabel the fault as both read and write.
details cribbed from linux and openbsd.
part of PR 25633, PR 25896.
This commit is contained in:
chs 2005-02-03 16:15:06 +00:00
parent cff5b51c44
commit 3cee1cf44e
1 changed files with 13 additions and 2 deletions
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15
sys/arch/sparc/sparc/trap.c
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@ -1,4 +1,4 @@
/* $NetBSD: trap.c,v 1.155 2004/08/28 17:53:02 jdolecek Exp $ */
/* $NetBSD: trap.c,v 1.156 2005/02/03 16:15:06 chs Exp $ */
/*
* Copyright (c) 1996
@ -49,7 +49,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.155 2004/08/28 17:53:02 jdolecek Exp $");
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.156 2005/02/03 16:15:06 chs Exp $");
#include "opt_ddb.h"
#include "opt_ktrace.h"
@ -947,6 +947,17 @@ mem_access_fault(type, ser, v, pc, psr, tf)
goto fault;
}
atype = ser & SER_WRITE ? VM_PROT_WRITE : VM_PROT_READ;
if ((ser & SER_PROT) && atype == VM_PROT_READ && type != T_TEXTFAULT) {
/*
* The hardware reports faults by the atomic load/store
* instructions as read faults, so if the faulting instruction
* is one of those, relabel this fault as both read and write.
*/
if ((fuword((void *)pc) & 0xc1680000) == 0xc0680000) {
atype = VM_PROT_READ | VM_PROT_WRITE;
}
}
va = trunc_page(v);
if (psr & PSR_PS) {
extern char Lfsbail[];