linux-kernel - [PATCH v3 12/12] x86/asm: consolidate ASM_EXTABLE

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Date:   Tue, 18 Dec 2018 01:03:27 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     Richard Biener <rguenther@...e.de>,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juergen Gross <jgross@...e.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Nadav Amit <namit@...are.com>, Jann Horn <jannh@...gle.com>
Subject: [PATCH v3 12/12] x86/asm: consolidate ASM_EXTABLE_* macros

These macros are used by .c and .S files.

Let's unify the definition by using ASM() macro.

This was previously cleaned up by 0474d5d9d2f7 ("x86/extable:
Macrofy inline assembly code to work around GCC inlining bugs").

Now, I am refactoring the code without using the macros approach.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 arch/x86/include/asm/asm.h | 57 ++++++++++++----------------------------------
 1 file changed, 15 insertions(+), 42 deletions(-)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 6467757b..cff3b0a 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -118,36 +118,36 @@
 #endif
 
 /* Exception table entry */
-#ifdef __ASSEMBLY__
-# define _ASM_EXTABLE_HANDLE(from, to, handler)			\
-	.pushsection "__ex_table","a" ;				\
-	.balign 4 ;						\
-	.long (from) - . ;					\
-	.long (to) - . ;					\
-	.long (handler) - . ;					\
-	.popsection
-
-# define _ASM_EXTABLE(from, to)					\
+#define _ASM_EXTABLE_HANDLE(from, to, handler)			 \
+ASM(	.pushsection "__ex_table","a" ;				)\
+ASM(	.balign 4 ;						)\
+ASM(	.long (from) - . ;					)\
+ASM(	.long (to) - . ;					)\
+ASM(	.long (handler) - . ;					)\
+ASM(	.popsection						)
+
+#define _ASM_EXTABLE(from, to)					\
 	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
 
-# define _ASM_EXTABLE_UA(from, to)				\
+#define _ASM_EXTABLE_UA(from, to)				\
 	_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
 
-# define _ASM_EXTABLE_FAULT(from, to)				\
+#define _ASM_EXTABLE_FAULT(from, to)				\
 	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
 
-# define _ASM_EXTABLE_EX(from, to)				\
+#define _ASM_EXTABLE_EX(from, to)				\
 	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
 
-# define _ASM_EXTABLE_REFCOUNT(from, to)			\
+#define _ASM_EXTABLE_REFCOUNT(from, to)			\
 	_ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
 
-# define _ASM_NOKPROBE(entry)					\
+#define _ASM_NOKPROBE(entry)					\
 	.pushsection "_kprobe_blacklist","aw" ;			\
 	_ASM_ALIGN ;						\
 	_ASM_PTR (entry);					\
 	.popsection
 
+#ifdef __ASSEMBLY__
 .macro ALIGN_DESTINATION
 	/* check for bad alignment of destination */
 	movl %edi,%ecx
@@ -173,34 +173,7 @@
 	.endm
 
 #else
-# define _EXPAND_EXTABLE_HANDLE(x) #x
-# define _ASM_EXTABLE_HANDLE(from, to, handler)			\
-	" .pushsection \"__ex_table\",\"a\"\n"			\
-	" .balign 4\n"						\
-	" .long (" #from ") - .\n"				\
-	" .long (" #to ") - .\n"				\
-	" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n"	\
-	" .popsection\n"
-
-# define _ASM_EXTABLE(from, to)					\
-	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
-
-# define _ASM_EXTABLE_UA(from, to)				\
-	_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
-
-# define _ASM_EXTABLE_FAULT(from, to)				\
-	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
-
-# define _ASM_EXTABLE_EX(from, to)				\
-	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
-
-# define _ASM_EXTABLE_REFCOUNT(from, to)			\
-	_ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
-
-/* For C file, we already have NOKPROBE_SYMBOL macro */
-#endif
 
-#ifndef __ASSEMBLY__
 /*
  * This output constraint should be used for any inline asm which has a "call"
  * instruction.  Otherwise the asm may be inserted before the frame pointer
-- 
2.7.4