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Subject[PATCH 47 of 55] xen64: implement failsafe callback
Date
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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>
---
arch/x86/kernel/entry_64.S | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -1365,10 +1365,8 @@
# 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 @@
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 @@
SAVE_ALL
jmp error_exit
CFI_ENDPROC
-#endif
END(xen_failsafe_callback)

#endif /* CONFIG_XEN */



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