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>

diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 9753225..124941d 100644 (file)
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -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; \