[PATCH v3 1/5] x86/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust
From: FUJITA Tomonori <fujita.tomonori@gmail.com>
Date: 2025-02-13 14:00:49
Also in:
linux-riscv, lkml, loongarch, rust-for-linux
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Add new ARCH_WARN_ASM macro for BUG/WARN assembly code sharing with Rust to avoid the duplication. No functional changes. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> --- arch/x86/include/asm/bug.h | 56 +++++++++++++++++++------------------- 1 file changed, 28 insertions(+), 28 deletions(-)
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index e85ac0c7c039..61570ec9464c 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h@@ -28,45 +28,42 @@ #ifdef CONFIG_GENERIC_BUG #ifdef CONFIG_X86_32 -# define __BUG_REL(val) ".long " __stringify(val) +# define __BUG_REL(val) ".long " val #else -# define __BUG_REL(val) ".long " __stringify(val) " - ." +# define __BUG_REL(val) ".long " val " - ." #endif #ifdef CONFIG_DEBUG_BUGVERBOSE +#define __BUG_ENTRY(file, line, flags) \ + "2:\t" __BUG_REL("1b") "\t# bug_entry::bug_addr\n" \ + "\t" __BUG_REL(file) "\t# bug_entry::file\n" \ + "\t.word " line "\t# bug_entry::line\n" \ + "\t.word " flags "\t# bug_entry::flags\n" +#else +#define __BUG_ENTRY(file, ine, flags) \ + "2:\t" __BUG_REL("1b") "\t# bug_entry::bug_addr\n" \ + "\t.word " flags "\t# bug_entry::flags\n" +#endif + +#define _BUG_FLAGS_ASM(ins, file, line, flags, size, extra) \ + "1:\t" ins "\n" \ + ".pushsection __bug_table,\"aw\"\n" \ + __BUG_ENTRY(file, line, flags) \ + "\t.org 2b + " size "\n" \ + ".popsection\n" \ + extra #define _BUG_FLAGS(ins, flags, extra) \ do { \ - asm_inline volatile("1:\t" ins "\n" \ - ".pushsection __bug_table,\"aw\"\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 \ + asm_inline volatile(_BUG_FLAGS_ASM(ins, "%c0", \ + "%c1", "%c2", "%c3", 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,\"aw\"\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 */ +#define ARCH_WARN_ASM(file, line, flags, size) \ + _BUG_FLAGS_ASM(ASM_UD2, file, line, flags, size, "") #else
@@ -88,11 +85,14 @@ do { \ * were to trigger, we'd rather wreck the machine in an attempt to get the * message out than not know about it. */ + +#define ARCH_WARN_REACHABLE ANNOTATE_REACHABLE(1b) + #define __WARN_FLAGS(flags) \ do { \ __auto_type __flags = BUGFLAG_WARNING|(flags); \ instrumentation_begin(); \ - _BUG_FLAGS(ASM_UD2, __flags, ANNOTATE_REACHABLE(1b)); \ + _BUG_FLAGS(ASM_UD2, __flags, ARCH_WARN_REACHABLE); \ instrumentation_end(); \ } while (0)
--
2.43.0