x86: irq: fix apicinterrupts on 64 bits

Impact: Fix interrupt via the apicinterrupt macro

Checkin 939b787 changed the
"interrupt" macro, but the "interrupt" macro is also invoked
indirectly from the "apicinterrupt" macro.

The "apicinterrupt" macro probably should have its own collection of
systematic stubs for the same reason the main IRQ code does; as is it
is a huge amount of replicated code.

Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

arch/x86/kernel/entry_64.S

@@ -675,9 +675,8 @@ END(interrupt)
  * Entry runs with interrupts off.	
  */ 
 
-/* 0(%rsp): ~(interrupt number)+0x80 */ 
+/* 0(%rsp): ~(interrupt number) */
 	.macro interrupt func
-	addq $-0x80,(%rsp)		/* Adjust vector to [-256,-1] range */
 	cld
 	SAVE_ARGS
 	leaq -ARGOFFSET(%rsp),%rdi	/* arg1 for handler */
@@ -711,9 +710,14 @@ END(interrupt)
 	call \func
 	.endm
 
+	/*
+	 * The interrupt stubs push (~vector+0x80) onto the stack and
+	 * then jump to common_interrupt.
+	 */
 	.p2align CONFIG_X86_L1_CACHE_SHIFT
 common_interrupt:
 	XCPT_FRAME
+	addq $-0x80,(%rsp)		/* Adjust vector to [-256,-1] range */
 	interrupt do_IRQ
 	/* 0(%rsp): oldrsp-ARGOFFSET */
 ret_from_intr: