linux-kernel - [tip:core/objtool] x86/xen: Add unwind hint annotations

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Message-ID: <tip-abbe1cac6214d81d2f4e149aba64a8760703144e@git.kernel.org>
Date:   Thu, 28 Sep 2017 03:57:18 -0700
From:   tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     boris.ostrovsky@...cle.com, tglx@...utronix.de,
        torvalds@...ux-foundation.org, jgross@...e.com,
        linux-kernel@...r.kernel.org, mingo@...nel.org, luto@...nel.org,
        peterz@...radead.org, jslaby@...e.cz, jpoimboe@...hat.com,
        hpa@...or.com
Subject: [tip:core/objtool] x86/xen: Add unwind hint annotations

Commit-ID:  abbe1cac6214d81d2f4e149aba64a8760703144e
Gitweb:     https://git.kernel.org/tip/abbe1cac6214d81d2f4e149aba64a8760703144e
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Mon, 18 Sep 2017 21:43:36 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 28 Sep 2017 09:39:03 +0200

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>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/70ed2eb516fe9266be766d953f93c2571bca88cc.1505764066.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/xen/xen-head.S | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 9753225..124941d 100644
--- 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; \