LoongArch: Consolidate __ex_table construction

mainline inclusion
from mainline-v6.2-rc1
commit 508f28c6
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP
CVE: NA

--------------------------------

Consolidate all the __ex_table constuction code with a _ASM_EXTABLE or
_asm_extable helper.

There should be no functional change as a result of this patch.
Signed-off-by: NYouling Tang <tangyouling@loongson.cn>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>
Change-Id: I24db0d24f7ec183f687221f9d99c4eb8f17cebd2

arch/loongarch/include/asm/asm-extable.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_ASM_EXTABLE_H
+#define __ASM_ASM_EXTABLE_H
+
+#ifdef __ASSEMBLY__
+
+#define __ASM_EXTABLE_RAW(insn, fixup)			\
+	.pushsection	__ex_table, "a";		\
+	.balign		8;				\
+	.quad		(insn);				\
+	.quad		(fixup);			\
+	.popsection;
+
+	.macro		_asm_extable, insn, fixup
+	__ASM_EXTABLE_RAW(\insn, \fixup)
+	.endm
+
+#else /* __ASSEMBLY__ */
+
+#include <linux/bits.h>
+#include <linux/stringify.h>
+
+#define __ASM_EXTABLE_RAW(insn, fixup)			\
+	".pushsection	__ex_table, \"a\"\n"		\
+	".balign	8\n"				\
+	".quad		((" insn "))\n"			\
+	".quad		((" fixup "))\n"		\
+	".popsection\n"
+
+#define _ASM_EXTABLE(insn, fixup)	\
+	__ASM_EXTABLE_RAW(#insn, #fixup)
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_ASM_EXTABLE_H */

arch/loongarch/include/asm/futex.h

@@ -7,6 +7,7 @@
 
 #include <linux/futex.h>
 #include <linux/uaccess.h>
+#include <asm/asm-extable.h>
 #include <asm/barrier.h>
 #include <asm/errno.h>
 
@@ -22,10 +23,8 @@
 	"4:	li.w	%0, %6				\n"	\
 	"	b	3b				\n"	\
 	"	.previous				\n"	\
-	"	.section __ex_table,\"a\"		\n"	\
-	"	"__UA_ADDR "\t1b, 4b			\n"	\
-	"	"__UA_ADDR "\t2b, 4b			\n"	\
-	"	.previous				\n"	\
+	_ASM_EXTABLE(1b, 4b)					\
+	_ASM_EXTABLE(2b, 4b)					\
 	: "=r" (ret), "=&r" (oldval),				\
 	  "=ZC" (*uaddr)					\
 	: "0" (0), "ZC" (*uaddr), "Jr" (oparg),			\
@@ -92,10 +91,8 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newv
 	"4:	li.d	%0, %6					\n"
 	"	b	3b					\n"
 	"	.previous					\n"
-	"	.section __ex_table,\"a\"			\n"
-	"	"__UA_ADDR "\t1b, 4b				\n"
-	"	"__UA_ADDR "\t2b, 4b				\n"
-	"	.previous					\n"
+	_ASM_EXTABLE(1b, 4b)
+	_ASM_EXTABLE(2b, 4b)
 	: "+r" (ret), "=&r" (val), "=ZC" (*uaddr)
 	: "ZC" (*uaddr), "Jr" (oldval), "Jr" (newval),
 	  "i" (-EFAULT)

arch/loongarch/include/asm/uaccess.h

@@ -15,6 +15,7 @@
 #include <linux/string.h>
 #include <linux/extable.h>
 #include <asm/pgtable.h>
+#include <asm/asm-extable.h>
 #include <asm-generic/extable.h>
 
 extern u64 __ua_limit;
@@ -207,9 +208,7 @@ do {									\
 	"	move	%1, $zero				\n"	\
 	"	b	2b					\n"	\
 	"	.previous					\n"	\
-	"	.section __ex_table,\"a\"			\n"	\
-	"	"__UA_ADDR "\t1b, 3b				\n"	\
-	"	.previous					\n"	\
+	_ASM_EXTABLE(1b, 3b)						\
 	: "+r" (__gu_err), "=r" (__gu_tmp)				\
 	: "m" (__m(ptr)), "i" (-EFAULT));				\
 									\
@@ -238,9 +237,7 @@ do {									\
 	"3:	li.w	%0, %3					\n"	\
 	"	b	2b					\n"	\
 	"	.previous					\n"	\
-	"	.section	__ex_table,\"a\"		\n"	\
-	"	" __UA_ADDR "	1b, 3b				\n"	\
-	"	.previous					\n"	\
+	_ASM_EXTABLE(1b, 3b)						\
 	: "+r" (__pu_err), "=m" (__m(ptr))				\
 	: "Jr" (__pu_val), "i" (-EFAULT));				\
 }

arch/loongarch/kernel/fpu.S

@@ -8,6 +8,7 @@
  */
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/asm-extable.h>
 #include <asm/asm-offsets.h>
 #include <asm/errno.h>
 #include <asm/export.h>
@@ -21,9 +22,7 @@
 
 	.macro	EX insn, reg, src, offs
 .ex\@:	\insn	\reg, \src, \offs
-	.section __ex_table,"a"
-	PTR	.ex\@, fault
-	.previous
+	_asm_extable .ex\@, fault
 	.endm
 
 	.macro	EX_V insn, reg, src, offs
@@ -34,9 +33,7 @@
 
 .ex\@:
 	.word __insn << 22 | __offs << 10 | __src << 5 | __reg
-	.section __ex_table,"a"
-	PTR	.ex\@, fault
-	.previous
+	_asm_extable .ex\@, fault
 	.endm
 
 	.macro	EX_XV insn, reg, src, offs
@@ -47,9 +44,7 @@
 
 .ex\@:
 	.word __insn << 22 | __offs << 10 | __src << 5 | __reg
-	.section __ex_table,"a"
-	PTR	.ex\@, fault
-	.previous
+	_asm_extable .ex\@, fault
 	.endm
 
 	.macro sc_save_fp base

arch/loongarch/lib/clear_user.S

@@ -5,6 +5,7 @@
 
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/asm-extable.h>
 #include <asm/export.h>
 #include <asm/regdef.h>
 
@@ -15,9 +16,7 @@
 	jr	ra
 	.previous
 .endif
-	.section __ex_table, "a"
-	PTR	\from\()b, \to\()b
-	.previous
+	_asm_extable \from\()b, \to\()b
 .endm
 
 /*

arch/loongarch/lib/copy_user.S

@@ -5,6 +5,7 @@
 
 #include <asm/asm.h>
 #include <asm/asmmacro.h>
+#include <asm/asm-extable.h>
 #include <asm/export.h>
 #include <asm/regdef.h>
 
@@ -15,9 +16,7 @@
 	jr	ra
 	.previous
 .endif
-	.section __ex_table, "a"
-	PTR	\from\()b, \to\()b
-	.previous
+	_asm_extable \from\()b, \to\()b
 .endm
 
 /*

arch/loongarch/lib/strncpy_user.S

@@ -7,6 +7,7 @@
 #include <asm/asmmacro.h>
 #include <asm/export.h>
 #include <asm/regdef.h>
+#include <asm/asm-extable.h>
 
 /*
  * long __strncpy_from_user(char *to, const char *from, long len)
@@ -39,10 +40,7 @@ SYM_FUNC_START(__strncpy_from_user)
 3:	li.w	a0, -EFAULT
 	jr	ra
 	.previous
-
-	.section __ex_table, "a"
-	PTR	1b, 3b
-	.previous
+	_asm_extable 1b, 3b
 SYM_FUNC_END(__strncpy_from_user)
 
 EXPORT_SYMBOL(__strncpy_from_user)

arch/loongarch/lib/strnlen_user.S

@@ -6,6 +6,7 @@
 #include <asm/asmmacro.h>
 #include <asm/export.h>
 #include <asm/regdef.h>
+#include <asm/asm-extable.h>
 
 /*
  * long __strnlen_user(const char *s, long n)
@@ -36,9 +37,7 @@ SYM_FUNC_START(__strnlen_user)
 	jr	ra
 	.previous
 
-	.section __ex_table, "a"
-	PTR	1b, 3b
-	.previous
+	_asm_extable 1b, 3b
 SYM_FUNC_END(__strnlen_user)
 
 EXPORT_SYMBOL(__strnlen_user)