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Revert "x86/extable: Macrofy inline assembly code to work around GCC inlining bugs"

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This reverts commit 0474d5d9d2.

See this commit for details about the revert:

  e769742d35 ("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>
This commit is contained in:
Ingo Molnar 2018-12-19 11:20:37 +01:00
parent c3462ba986
commit 81a68455e7
2 changed files with 33 additions and 21 deletions
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53
arch/x86/include/asm/asm.h
View File

@ -120,25 +120,12 @@
/* Exception table entry */
#ifdef __ASSEMBLY__
# define _ASM_EXTABLE_HANDLE(from, to, handler) \
ASM_EXTABLE_HANDLE from to handler
.macro ASM_EXTABLE_HANDLE from:req to:req handler:req
.pushsection "__ex_table","a"
.balign 4
.long (\from) - .
.long (\to) - .
.long (\handler) - .
.pushsection "__ex_table","a" ; \
.balign 4 ; \
.long (from) - . ; \
.long (to) - . ; \
.long (handler) - . ; \
.popsection
.endm
#else /* __ASSEMBLY__ */
# define _ASM_EXTABLE_HANDLE(from, to, handler) \
"ASM_EXTABLE_HANDLE from=" #from " to=" #to \
" handler=\"" #handler "\"\n\t"
/* For C file, we already have NOKPROBE_SYMBOL macro */
#endif /* __ASSEMBLY__ */
# define _ASM_EXTABLE(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
@ -161,7 +148,6 @@
_ASM_PTR (entry); \
.popsection
#ifdef __ASSEMBLY__
.macro ALIGN_DESTINATION
/* check for bad alignment of destination */
movl %edi,%ecx
@ -185,7 +171,34 @@
_ASM_EXTABLE_UA(100b, 103b)
_ASM_EXTABLE_UA(101b, 103b)
.endm
#endif /* __ASSEMBLY__ */
#else
# define _EXPAND_EXTABLE_HANDLE(x) #x
# define _ASM_EXTABLE_HANDLE(from, to, handler) \
" .pushsection \"__ex_table\",\"a\"\n" \
" .balign 4\n" \
" .long (" #from ") - .\n" \
" .long (" #to ") - .\n" \
" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
" .popsection\n"
# define _ASM_EXTABLE(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
# define _ASM_EXTABLE_UA(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
# define _ASM_EXTABLE_FAULT(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
# define _ASM_EXTABLE_EX(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
# define _ASM_EXTABLE_REFCOUNT(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_refcount)
/* For C file, we already have NOKPROBE_SYMBOL macro */
#endif
#ifndef __ASSEMBLY__
/*

1
arch/x86/kernel/macros.S
View File

@ -11,4 +11,3 @@
#include <asm/alternative-asm.h>
#include <asm/bug.h>
#include <asm/paravirt.h>
#include <asm/asm.h>