linux-kernel - [PATCH v1 11/14] DCE/DSE: riscv: build reference for .pushsection in C functions

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Message-Id: <ab9af3f07b520c8679a586770e3d488cb4866e8e.1699025537.git.tanyuan@tinylab.org>
Date:   Sat,  4 Nov 2023 00:02:50 +0800
From:   Yuan Tan <tanyuan@...ylab.org>
To:     falcon@...ylab.org, arnd@...db.de, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-riscv@...ts.infradead.org,
        luc.vanoostenryck@...il.com, linux-sparse@...r.kernel.org
Cc:     linux@...ssschuh.net, palmer@...osinc.com,
        paul.walmsley@...ive.com, paulburton@...nel.org,
        paulmck@...nel.org, tim.bird@...y.com, tsbogend@...ha.franken.de,
        w@....eu, tanyuan@...ylab.org, i@...kray.me
Subject: [PATCH v1 11/14] DCE/DSE: riscv: build reference for .pushsection in C functions

Add the SECTION_SHF_LINK_ORDER method and the SECTION_SHF_GROUP method
to refactor __ASM_EXTABLE_RAW, so it won't produce orphan sections
anymore.

Signed-off-by: Yuan Tan <tanyuan@...ylab.org>
Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
---
 arch/riscv/include/asm/asm-extable.h | 34 ++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/asm-extable.h b/arch/riscv/include/asm/asm-extable.h
index d0be5a838242..7164d871e038 100644
--- a/arch/riscv/include/asm/asm-extable.h
+++ b/arch/riscv/include/asm/asm-extable.h
@@ -13,6 +13,21 @@
 
 #ifdef __ASSEMBLY__
 
+#if defined(CONFIG_SECTION_SHF_LINK_ORDER_SUPPORT)
+#define __ASM_EXTABLE_PUSH_SECTION			\
+	__LABEL_NAME(.L__ex_table) :			\
+	.pushsection __SECTION_NAME(__ex_table), "ao", __LABEL_NAME(.L__ex_table)
+
+#elif defined(CONFIG_SECTION_SHF_GROUP_SUPPORT)
+#define __ASM_EXTABLE_PUSH_SECTION			\
+	.attach_to_group __SECTION_NAME(__ex_table);	\
+	.pushsection __SECTION_NAME(__ex_table), "a?"
+
+#else
+#define __ASM_EXTABLE_PUSH_SECTION			\
+	.pushsection __SECTION_NAME(__ex_table), "a"
+#endif
+
 #define __ASM_EXTABLE_RAW(insn, fixup, type, data)	\
 	.pushsection	__SECTION_NAME(__ex_table), "a";		\
 	.balign		4;				\
@@ -32,8 +47,23 @@
 #include <linux/stringify.h>
 #include <asm/gpr-num.h>
 
-#define __ASM_EXTABLE_RAW(insn, fixup, type, data)	\
-	".pushsection "	__SECTION_NAME(__ex_table) ", \"a\"\n"		\
+#ifdef CONFIG_SECTION_SHF_LINK_ORDER_SUPPORT
+#define __ASM_EXTABLE_PUSH_SECTION				\
+	__LABEL_NAME(.L__ex_table) ":"				\
+	".pushsection "	__SECTION_NAME(__ex_table) ", \"ao\"," __LABEL_NAME(.L__ex_table) "\n"
+
+#elif defined(CONFIG_SECTION_SHF_GROUP_SUPPORT)
+#define __ASM_EXTABLE_PUSH_SECTION				\
+	".attach_to_group " __SECTION_NAME(__ex_table) "\n"	\
+	".pushsection "	__SECTION_NAME(__ex_table) ", \"a?\"\n"
+
+#else
+#define __ASM_EXTABLE_PUSH_SECTION				\
+	".pushsection "	__SECTION_NAME(__ex_table) ", \"a\"\n"
+#endif
+
+#define __ASM_EXTABLE_RAW(insn, fixup, type, data)		\
+	__ASM_EXTABLE_PUSH_SECTION				\
 	".balign	4\n"				\
 	".long		((" insn ") - .)\n"		\
 	".long		((" fixup ") - .)\n"		\
-- 
2.34.1