Commit abbe1cac authored Sep 18, 2017 by Josh Poimboeuf Committed by Ingo Molnar Sep 28, 2017

x86/xen: Add unwind hint annotations



Add unwind hint annotations to the xen head code so the ORC unwinder can
read head_64.o.

hypercall_page needs empty annotations at 32-byte intervals to match the
'xen_hypercall_*' ELF functions at those locations.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/70ed2eb516fe9266be766d953f93c2571bca88cc.1505764066.git.jpoimboe@redhat.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 2582d3df

arch/x86/xen/xen-head.S

+6 −1

Original line number	Diff line number	Diff line
		@@ -9,6 +9,7 @@
		#include <asm/boot.h>
		#include <asm/asm.h>
		#include <asm/page_types.h>
		#include <asm/unwind_hints.h>

		#include <xen/interface/elfnote.h>
		#include <xen/interface/features.h>
		@@ -19,6 +20,7 @@
		#ifdef CONFIG_XEN_PV
		__INIT
		ENTRY(startup_xen)
		UNWIND_HINT_EMPTY
		cld

		/* Clear .bss */
		@@ -40,7 +42,10 @@ END(startup_xen)
		.pushsection .text
		.balign PAGE_SIZE
		ENTRY(hypercall_page)
		.skip PAGE_SIZE
		.rept (PAGE_SIZE / 32)
		UNWIND_HINT_EMPTY
		.skip 32
		.endr

		#define HYPERCALL(n) \
		.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \