Author: bde
Date: Sun Jun 10 14:21:01 2018
New Revision: 334924
URL: https://svnweb.freebsd.org/changeset/base/334924
Log:
Fix panics in potentially all x86bios calls on i386 since r332489.
A call to npxsave() in the exception trampolines was not relocated.
This call to a garbage address usually paniced when made, but it is only
made when the thread has used an FPU recently, and this is not the usual
case.
PR: 228755
Reviewed by: kib
Modified:
head/sys/i386/i386/vm86bios.s
Modified: head/sys/i386/i386/vm86bios.s
==============================================================================
--- head/sys/i386/i386/vm86bios.s Sun Jun 10 10:23:31 2018
(r334923)
+++ head/sys/i386/i386/vm86bios.s Sun Jun 10 14:21:01 2018
(r334924)
@@ -67,7 +67,8 @@ ENTRY(vm86_bioscall)
pushl %edx
movl TD_PCB(%ecx),%ecx
pushl PCB_SAVEFPU(%ecx)
- call npxsave
+ movl $npxsave,%eax
+ call *%eax
addl $4,%esp
popl %edx /* recover our pcb */
1:
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