From: Jeremy Fitzhardinge Date: Tue, 8 Jul 2008 22:07:09 +0000 (-0700) Subject: xen64: implement failsafe callback X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4a5c3e77f70b3ea8b361d7fa9eb2e4dad18f70ae;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 Cc: Stephen Tweedie Cc: Eduardo Habkost Cc: Mark McLoughlin Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 7cc2de796146..6aa6932e21b1 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 */