x86/entry: Convert double fault exception to IDTENTRY_DF
Convert #DF to IDTENTRY_DF
- Implement the C entry point with DEFINE_IDTENTRY_DF
- Emit the ASM stub with DECLARE_IDTENTRY_DF on 64bit
- Remove the ASM idtentry in 64bit
- Adjust the 32bit shim code
- Fixup the XEN/PV code
- Remove the old prototypes
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505135315.583415264@linutronix.de
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index d302839..d983a0d 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -680,15 +680,9 @@
call paranoid_entry
UNWIND_HINT_REGS
- /* Read CR2 early */
- GET_CR2_INTO(%r12);
-
- TRACE_IRQS_OFF
-
movq %rsp, %rdi /* pt_regs pointer into first argument */
movq ORIG_RAX(%rsp), %rsi /* get error code into 2nd argument*/
movq $-1, ORIG_RAX(%rsp) /* no syscall to restart */
- movq %r12, %rdx /* Move CR2 into 3rd argument */
call \cfunc
jmp paranoid_exit
@@ -918,7 +912,7 @@
/*
* This may fault. Non-paranoid faults on return to userspace are
* handled by fixup_bad_iret. These include #SS, #GP, and #NP.
- * Double-faults due to espfix64 are handled in do_double_fault.
+ * Double-faults due to espfix64 are handled in exc_double_fault.
* Other faults here are fatal.
*/
iretq
@@ -1073,8 +1067,6 @@
idtentry X86_TRAP_PF page_fault do_page_fault has_error_code=1
-idtentry_df X86_TRAP_DF double_fault do_double_fault
-
#ifdef CONFIG_XEN_PV
idtentry 512 /* dummy */ hypervisor_callback xen_do_hypervisor_callback has_error_code=0
#endif