linux-kernel - [PATCH v1 4/5] loongarch/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust

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Message-ID: <20241210001802.228725-5-fujita.tomonori@gmail.com>
Date: Tue, 10 Dec 2024 09:18:00 +0900
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Cc: x86@...nel.org,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	loongarch@...ts.linux.dev,
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Subject: [PATCH v1 4/5] loongarch/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust

Add new ARCH_WARN_ASM macro for BUG/WARN assembly code sharing with
Rust to avoid the duplication.

No functional changes.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
---
 arch/loongarch/include/asm/bug.h | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/arch/loongarch/include/asm/bug.h b/arch/loongarch/include/asm/bug.h
index 08388876ade4..2343c4226595 100644
--- a/arch/loongarch/include/asm/bug.h
+++ b/arch/loongarch/include/asm/bug.h
@@ -21,14 +21,21 @@
 #ifndef CONFIG_GENERIC_BUG
 #define __BUG_ENTRY(flags)
 #else
-#define __BUG_ENTRY(flags) 					\
+
+#define __BUG_ENTRY_START					\
 		.pushsection __bug_table, "aw";			\
 		.align 2;					\
 	10000:	.long 10001f - .;				\
-		_BUGVERBOSE_LOCATION(__FILE__, __LINE__)	\
-		.short flags; 					\
+
+#define __BUG_ENTRY_END						\
 		.popsection;					\
 	10001:
+
+#define __BUG_ENTRY(flags)					\
+		__BUG_ENTRY_START			\
+		_BUGVERBOSE_LOCATION(__FILE__, __LINE__)	\
+		.short flags;					\
+		__BUG_ENTRY_END
 #endif
 
 #define ASM_BUG_FLAGS(flags)					\
@@ -55,6 +62,24 @@ do {								\
 	unreachable();						\
 } while (0)
 
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+#define __BUG_LOCATION_STRING(file, line)		\
+		".long " file "- .;"			\
+		".short " line ";"
+#else
+#define __BUG_LOCATION_STRING(_file, _line)
+#endif
+
+#define __BUG_ENTRY_STRING(file, line, flags)		\
+		__stringify(__BUG_ENTRY_START)		\
+		__BUG_LOCATION_STRING(file, line)	\
+		".short " flags ";"			\
+		__stringify(__BUG_ENTRY_END)
+
+#define ARCH_WARN_ASM(file, line, flags, size)		\
+	__BUG_ENTRY_STRING(file, line, flags)		\
+	__stringify(break BRK_BUG) ";"
+
 #define HAVE_ARCH_BUG
 
 #include <asm-generic/bug.h>
-- 
2.43.0