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handle IDT-less case just as linux does

This commit is contained in:
itojun 2002-06-24 10:10:17 +00:00
parent fe3778040b
commit 9f911945d5
1 changed files with 13 additions and 8 deletions
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21
sys/arch/i386/i386/vm86.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm86.c,v 1.26 2002/03/29 17:07:06 christos Exp $ */ /* $NetBSD: vm86.c,v 1.27 2002/06/24 10:10:17 itojun Exp $ */
/*- /*-
* Copyright (c) 1996 The NetBSD Foundation, Inc. * Copyright (c) 1996 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vm86.c,v 1.26 2002/03/29 17:07:06 christos Exp $"); __KERNEL_RCSID(0, "$NetBSD: vm86.c,v 1.27 2002/06/24 10:10:17 itojun Exp $");
#include <sys/param.h> #include <sys/param.h>
#include <sys/systm.h> #include <sys/systm.h>
@ -158,8 +158,17 @@ fast_intxx(p, intrno)
* Fetch intr handler info from "real-mode" IDT based at addr 0 in * Fetch intr handler info from "real-mode" IDT based at addr 0 in
* the user address space. * the user address space.
*/ */
if (copyin((caddr_t)(intrno * sizeof(ihand)), &ihand, sizeof(ihand))) if (copyin((caddr_t)(intrno * sizeof(ihand)), &ihand, sizeof(ihand))) {
goto bad; /*
* No IDT! What Linux does here is simply call back into
* userspace with the VM86_INTx arg as if it was a revectored
* int. Some applications rely on this (i.e. dynamically
* emulate an IDT), and those that don't will crash in a
* spectacular way, I suppose.
* --thorpej@netbsd.org
*/
goto vector;
}
/* /*
* Otherwise, push flags, cs, eip, and jump to handler to * Otherwise, push flags, cs, eip, and jump to handler to
@ -181,10 +190,6 @@ fast_intxx(p, intrno)
vector: vector:
vm86_return(p, VM86_MAKEVAL(VM86_INTx, intrno)); vm86_return(p, VM86_MAKEVAL(VM86_INTx, intrno));
return; return;
bad:
vm86_return(p, VM86_UNKNOWN);
return;
} }
void void