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x86/xen: Add unwind hint annotations

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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>
This commit is contained in:
Josh Poimboeuf 2017-09-18 21:43:36 -05:00 committed by Ingo Molnar
parent 2582d3df95
commit abbe1cac62
1 changed files with 6 additions and 1 deletions
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7
arch/x86/xen/xen-head.S
View file

@ -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; \