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Make it possible to call badaddr_read() from interrupt context, even 

if curpcb is NULL, by borrowing lwp0's pcb if necessary (needed to
be able to set pcb_onfault).

Problem reported by Allen Briggs.
This commit is contained in:
scw 2004-01-26 10:45:24 +00:00
parent d6170777cf
commit b9992109f0
1 changed files with 18 additions and 3 deletions
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21
sys/arch/arm/arm32/fault.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: fault.c,v 1.46 2004/01/21 15:39:21 skrll Exp $ */
/* $NetBSD: fault.c,v 1.47 2004/01/26 10:45:24 scw Exp $ */
/*
* Copyright 2003 Wasabi Systems, Inc.
@ -81,7 +81,7 @@
#include "opt_kgdb.h"
#include <sys/types.h>
__KERNEL_RCSID(0, "$NetBSD: fault.c,v 1.46 2004/01/21 15:39:21 skrll Exp $");
__KERNEL_RCSID(0, "$NetBSD: fault.c,v 1.47 2004/01/26 10:45:24 scw Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -810,10 +810,20 @@ badaddr_read(void *addr, size_t size, void *rptr)
uint16_t v2;
uint32_t v4;
} u;
int rv;
struct pcb *curpcb_save;
int rv, s;
cpu_drain_writebuf();
/*
* We might be called at interrupt time, so arrange to steal
* lwp0's PCB temporarily, if required, so that pcb_onfault
* handling works correctly.
*/
s = splhigh();
if ((curpcb_save = curpcb) == NULL)
curpcb = &lwp0.l_addr->u_pcb;
/* Read from the test address. */
switch (size) {
case sizeof(uint8_t):
@ -835,9 +845,14 @@ badaddr_read(void *addr, size_t size, void *rptr)
break;
default:
curpcb = curpcb_save;
panic("badaddr: invalid size (%lu)", (u_long) size);
}
/* Restore curpcb */
curpcb = curpcb_save;
splx(s);
/* Return EFAULT if the address was invalid, else zero */
return (rv);
}