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[Xen-devel] [PATCH] x86/32on64: adjust address when converting syscall t

from [Jan Beulich]

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Subject:	[Xen-devel] [PATCH] x86/32on64: adjust address when converting syscall to fault
From:	"Jan Beulich" <jbeulich@xxxxxxxxxx>
Date:	Fri, 05 Dec 2008 14:20:03 +0000
Delivery-date:	Fri, 05 Dec 2008 06:19:21 -0800
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The faulting address is at the start of the syscall instruction rather
than at the following one.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: 2008-11-20/xen/arch/x86/x86_64/compat/entry.S
===================================================================
--- 2008-11-20.orig/xen/arch/x86/x86_64/compat/entry.S  2008-07-18 
16:19:34.000000000 +0200
+++ 2008-11-20/xen/arch/x86/x86_64/compat/entry.S       2008-11-28 
11:47:56.000000000 +0100
@@ -234,6 +234,7 @@ ENTRY(compat_syscall)
         call  compat_create_bounce_frame
         jmp   compat_test_all_events
 2:      movl  $TRAP_gp_fault,UREGS_entry_vector(%rsp)
+        subl  $2,UREGS_rip(%rsp)
         movq  VCPU_gp_fault_addr(%rbx),%rax
         movzwl VCPU_gp_fault_sel(%rbx),%esi
         movb  $(TBF_EXCEPTION|TBF_EXCEPTION_ERRCODE|TBF_INTERRUPT),%cl




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