Merge tag 'vfio-v4.8-rc1' of git://github.com/awilliam/linux-vfio

[cascardo/linux.git] / arch / x86 / entry / entry_32.S

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 983e5d3..0b56666 100644 (file)
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1153,3 +1153,14 @@ ENTRY(async_page_fault)
        jmp     error_code
 END(async_page_fault)
 #endif
+
+ENTRY(rewind_stack_do_exit)
+       /* Prevent any naive code from trying to unwind to our caller. */
+       xorl    %ebp, %ebp
+
+       movl    PER_CPU_VAR(cpu_current_top_of_stack), %esi
+       leal    -TOP_OF_KERNEL_STACK_PADDING-PTREGS_SIZE(%esi), %esp
+
+       call    do_exit
+1:     jmp 1b
+END(rewind_stack_do_exit)