linux-kernel - [PREVIEW 10/10] linkage: add .cfi_{start/end}proc to ENTRY/ENDPROC

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Date:   Fri, 17 Feb 2017 11:47:57 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     mingo@...hat.com
Cc:     tglx@...utronix.de, hpa@...or.com, x86@...nel.org,
        jpoimboe@...hat.com, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PREVIEW 10/10] linkage: add .cfi_{start/end}proc to ENTRY/ENDPROC

This is just a preview, not to merged now, only later with DWARF
unwinder series. This is what the series will serve for (aside from
cleanup and unification).

I am aware of CFI_STARTPROC and CFI_ENDPROC left defined in other archs
in spite of cfi annotations removal ages ago. For simplicity. I am using
DW_ prefix here.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 include/linux/linkage.h | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/include/linux/linkage.h b/include/linux/linkage.h
index fe5bbdac719b..af14364a63ef 100644
--- a/include/linux/linkage.h
+++ b/include/linux/linkage.h
@@ -72,6 +72,14 @@
 #define __ALIGN_STR	".align 4,0x90"
 #endif
 
+#ifdef CONFIG_X86 /* to be replaced by CONFIG_DWARF_UNWIND after 01 tests */
+#define DW_CFI_STARTPROC .cfi_startproc
+#define DW_CFI_ENDPROC .cfi_endproc
+#else
+#define DW_CFI_STARTPROC
+#define DW_CFI_ENDPROC
+#endif
+
 #ifdef __ASSEMBLY__
 
 #ifndef LINKER_SCRIPT
@@ -92,7 +100,8 @@
 
 #ifndef ENTRY_LOCAL
 #define ENTRY_LOCAL(name) \
-	ENTRY_LOCAL_ALIAS(name)
+	ENTRY_LOCAL_ALIAS(name) ASM_NL \
+	DW_CFI_STARTPROC
 #endif
 
 #ifndef ENTRY
@@ -126,6 +135,7 @@
  */
 #ifndef ENDPROC
 #define ENDPROC(name) \
+	DW_CFI_ENDPROC ASM_NL \
 	END_ALIAS(name)
 #endif
 
-- 
2.11.1