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authorJeremy Fitzhardinge <jeremy@goop.org>2008-07-08 15:07:09 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-16 11:04:41 +0200
commit4a5c3e77f70b3ea8b361d7fa9eb2e4dad18f70ae (patch)
tree8dd0085bb4dc6eeceb5a6dd070b9a05890d2d756
parent0775b3dbcb6d17b531b36df520ddab735647f3f7 (diff)
xen64: implement failsafe callback
Implement the failsafe callback, so that iret and segment register load exceptions are reported to the kernel. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stephen Tweedie <sct@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Cc: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/kernel/entry_64.S16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 7cc2de79614..6aa6932e21b 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1365,10 +1365,8 @@ END(do_hypervisor_callback)
# with its current contents: any discrepancy means we in category 1.
*/
ENTRY(xen_failsafe_callback)
-#if 1
- ud2a
-#else
- _frame (RIP-0x30)
+ framesz = (RIP-0x30) /* workaround buggy gas */
+ _frame framesz
CFI_REL_OFFSET rcx, 0
CFI_REL_OFFSET r11, 8
movw %ds,%cx
@@ -1391,8 +1389,13 @@ ENTRY(xen_failsafe_callback)
CFI_RESTORE r11
addq $0x30,%rsp
CFI_ADJUST_CFA_OFFSET -0x30
- movq $11,%rdi /* SIGSEGV */
- jmp do_exit
+ pushq $0
+ CFI_ADJUST_CFA_OFFSET 8
+ pushq %r11
+ CFI_ADJUST_CFA_OFFSET 8
+ pushq %rcx
+ CFI_ADJUST_CFA_OFFSET 8
+ jmp general_protection
CFI_RESTORE_STATE
1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */
movq (%rsp),%rcx
@@ -1406,7 +1409,6 @@ ENTRY(xen_failsafe_callback)
SAVE_ALL
jmp error_exit
CFI_ENDPROC
-#endif
END(xen_failsafe_callback)
#endif /* CONFIG_XEN */