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It looks like Xen cpu_hatch() calls cpu_switchto() with prevlwp=NULL, 

instead of calling idle_loop() directly.  I can't test a change to
cpu_hatch() right now so allow for prevlwp=NULL.
This commit is contained in:
ad 2020-01-13 12:03:41 +00:00
parent 20469ddbac
commit 8854b07344
1 changed files with 6 additions and 2 deletions
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8
sys/arch/i386/i386/locore.S
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@ -1,4 +1,4 @@
/* $NetBSD: locore.S,v 1.175 2020/01/08 17:38:41 ad Exp $ */
/* $NetBSD: locore.S,v 1.176 2020/01/13 12:03:41 ad Exp $ */
/*
* Copyright-o-rama!
@ -128,7 +128,7 @@
*/
#include <machine/asm.h>
__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.175 2020/01/08 17:38:41 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.176 2020/01/13 12:03:41 ad Exp $");
#include "opt_copy_symtab.h"
#include "opt_ddb.h"
@ -1316,10 +1316,14 @@ ENTRY(cpu_switchto)
movl 20(%esp),%edi /* newlwp */
movl 24(%esp),%edx /* returning */
testl %esi,%esi /* oldlwp = NULL ? */
jz skip_save
/* Save old context. */
movl L_PCB(%esi),%eax
movl %esp,PCB_ESP(%eax)
movl %ebp,PCB_EBP(%eax)
skip_save:
/* Switch to newlwp's stack. */
movl L_PCB(%edi),%ebx