linux-kernel - [PATCH 7/8] x86/xen: Add unwind hint annotations

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Message-Id: <785ac6c2cfa3f840a657c31583a4c746c8fe3699.1504210919.git.jpoimboe@redhat.com>
Date:   Thu, 31 Aug 2017 15:23:45 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 7/8] 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@...hat.com>
---
 arch/x86/xen/xen-head.S | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 9753225289e8..8f9741cbb32f 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -19,6 +19,7 @@
 #ifdef CONFIG_XEN_PV
 	__INIT
 ENTRY(startup_xen)
+	UNWIND_HINT_EMPTY
 	cld
 
 	/* Clear .bss */
@@ -40,7 +41,10 @@ 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; \
-- 
2.13.5