diff options
| author | Ingo Molnar | 2018-12-19 11:20:50 +0100 |
|---|---|---|
| committer | Ingo Molnar | 2018-12-19 12:00:00 +0100 |
| commit | ffb61c6346d0f02b2a03377a3edac838c1f09b45 (patch) | |
| tree | 4e01ec22fac771cf00f8e98b2cfee65f65934b77 /arch/x86 | |
| parent | a4da3d86a285f0035a21bae776846c5077a535df (diff) | |
Revert "x86/bug: Macrofy the BUG table section handling, to work around GCC inlining bugs"
This reverts commit f81f8ad56fd1c7b99b2ed1c314527f7d9ac447c6.
See this commit for details about the revert:
e769742d3584 ("Revert "x86/jump-labels: Macrofy inline assembly code to work around GCC inlining bugs"")
Reported-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Borislav Petkov <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Richard Biener <rguenther@suse.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/bug.h | 98 | ||||
| -rw-r--r-- | arch/x86/kernel/macros.S | 1 |
2 files changed, 42 insertions, 57 deletions
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h index 5090035e6d16..6804d6642767 100644 --- a/arch/x86/include/asm/bug.h +++ b/arch/x86/include/asm/bug.h @@ -4,8 +4,6 @@ #include <linux/stringify.h> -#ifndef __ASSEMBLY__ - /* * Despite that some emulators terminate on UD2, we use it for WARN(). * @@ -22,15 +20,53 @@ #define LEN_UD2 2 +#ifdef CONFIG_GENERIC_BUG + +#ifdef CONFIG_X86_32 +# define __BUG_REL(val) ".long " __stringify(val) +#else +# define __BUG_REL(val) ".long " __stringify(val) " - 2b" +#endif + +#ifdef CONFIG_DEBUG_BUGVERBOSE + +#define _BUG_FLAGS(ins, flags) \ +do { \ + asm 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" \ + : : "i" (__FILE__), "i" (__LINE__), \ + "i" (flags), \ + "i" (sizeof(struct bug_entry))); \ +} while (0) + +#else /* !CONFIG_DEBUG_BUGVERBOSE */ + #define _BUG_FLAGS(ins, flags) \ do { \ - asm volatile("ASM_BUG ins=\"" ins "\" file=%c0 line=%c1 " \ - "flags=%c2 size=%c3" \ - : : "i" (__FILE__), "i" (__LINE__), \ - "i" (flags), \ + asm 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" \ + : : "i" (flags), \ "i" (sizeof(struct bug_entry))); \ } while (0) +#endif /* CONFIG_DEBUG_BUGVERBOSE */ + +#else + +#define _BUG_FLAGS(ins, flags) asm volatile(ins) + +#endif /* CONFIG_GENERIC_BUG */ + #define HAVE_ARCH_BUG #define BUG() \ do { \ @@ -46,54 +82,4 @@ do { \ #include <asm-generic/bug.h> -#else /* __ASSEMBLY__ */ - -#ifdef CONFIG_GENERIC_BUG - -#ifdef CONFIG_X86_32 -.macro __BUG_REL val:req - .long \val -.endm -#else -.macro __BUG_REL val:req - .long \val - 2b -.endm -#endif - -#ifdef CONFIG_DEBUG_BUGVERBOSE - -.macro ASM_BUG ins:req file:req line:req flags:req size:req -1: \ins - .pushsection __bug_table,"aw" -2: __BUG_REL val=1b # bug_entry::bug_addr - __BUG_REL val=\file # bug_entry::file - .word \line # bug_entry::line - .word \flags # bug_entry::flags - .org 2b+\size - .popsection -.endm - -#else /* !CONFIG_DEBUG_BUGVERBOSE */ - -.macro ASM_BUG ins:req file:req line:req flags:req size:req -1: \ins - .pushsection __bug_table,"aw" -2: __BUG_REL val=1b # bug_entry::bug_addr - .word \flags # bug_entry::flags - .org 2b+\size - .popsection -.endm - -#endif /* CONFIG_DEBUG_BUGVERBOSE */ - -#else /* CONFIG_GENERIC_BUG */ - -.macro ASM_BUG ins:req file:req line:req flags:req size:req - \ins -.endm - -#endif /* CONFIG_GENERIC_BUG */ - -#endif /* __ASSEMBLY__ */ - #endif /* _ASM_X86_BUG_H */ diff --git a/arch/x86/kernel/macros.S b/arch/x86/kernel/macros.S index 66ccb8e823b1..852487a9fc56 100644 --- a/arch/x86/kernel/macros.S +++ b/arch/x86/kernel/macros.S @@ -9,4 +9,3 @@ #include <linux/compiler.h> #include <asm/refcount.h> #include <asm/alternative-asm.h> -#include <asm/bug.h> |