linux-kernel - [PATCH v2 46/62] x86/bug: Define ELF section entry size for the bug table

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Message-ID: <6b808664d8ff4c5eaa9cd416563341f3446b243b.1746821544.git.jpoimboe@kernel.org>
Date: Fri,  9 May 2025 13:17:10 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	live-patching@...r.kernel.org,
	Song Liu <song@...nel.org>,
	laokz <laokz@...mail.com>,
	Jiri Kosina <jikos@...nel.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Weinan Liu <wnliu@...gle.com>,
	Fazla Mehrab <a.mehrab@...edance.com>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Puranjay Mohan <puranjay@...nel.org>
Subject: [PATCH v2 46/62] x86/bug: Define ELF section entry size for the bug table

In preparation for the objtool klp diff subcommand, define the entry
size for the __bug_table section in its ELF header.  This will allow
tooling to extract individual entries.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/include/asm/bug.h | 44 ++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 21 deletions(-)

diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index fb3534ddbea2..277938f4a40b 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -41,33 +41,35 @@
 
 #define _BUG_FLAGS(ins, flags, extra)					\
 do {									\
-	asm_inline volatile("1:\t" ins "\n"				\
-		     ".pushsection __bug_table,\"a\"\n"			\
-		     "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
-		     "\t"  __BUG_REL(%c0) "\t# bug_entry::file\n"	\
-		     "\t.word %c1"        "\t# bug_entry::line\n"	\
-		     "\t.word %c2"        "\t# bug_entry::flags\n"	\
-		     "\t.org 2b+%c3\n"					\
-		     ".popsection\n"					\
-		     extra						\
-		     : : "i" (__FILE__), "i" (__LINE__),		\
-			 "i" (flags),					\
-			 "i" (sizeof(struct bug_entry)));		\
+	asm_inline volatile(						\
+		"1:\t" ins "\n"						\
+		".pushsection __bug_table, \"aM\", @progbits, %c3\n"	\
+		"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
+		"\t"  __BUG_REL(%c0) "\t# bug_entry::file\n"		\
+		"\t.word %c1"        "\t# bug_entry::line\n"		\
+		"\t.word %c2"        "\t# bug_entry::flags\n"		\
+		"\t.org 2b+%c3\n"					\
+		".popsection\n"						\
+		extra							\
+		: : "i" (__FILE__), "i" (__LINE__),			\
+		    "i" (flags),					\
+		    "i" (sizeof(struct bug_entry)));			\
 } while (0)
 
 #else /* !CONFIG_DEBUG_BUGVERBOSE */
 
 #define _BUG_FLAGS(ins, flags, extra)					\
 do {									\
-	asm_inline volatile("1:\t" ins "\n"				\
-		     ".pushsection __bug_table,\"a\"\n"			\
-		     "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
-		     "\t.word %c0"        "\t# bug_entry::flags\n"	\
-		     "\t.org 2b+%c1\n"					\
-		     ".popsection\n"					\
-		     extra						\
-		     : : "i" (flags),					\
-			 "i" (sizeof(struct bug_entry)));		\
+	asm_inline volatile(						\
+		"1:\t" ins "\n"						\
+		".pushsection __bug_table, \"aM\", @progbits, %c1\n"	\
+		"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
+		"\t.word %c0"        "\t# bug_entry::flags\n"		\
+		"\t.org 2b+%c1\n"					\
+		".popsection\n"						\
+		extra							\
+		: : "i" (flags),					\
+		    "i" (sizeof(struct bug_entry)));			\
 } while (0)
 
 #endif /* CONFIG_DEBUG_BUGVERBOSE */
-- 
2.49.0