Messages in this thread Patch in this message | | | Date | Tue, 18 Jul 2017 03:43:46 -0700 | From | tip-bot for Josh Poimboeuf <> | Subject | [tip:x86/asm] x86/asm: Add unwind hint annotations to sync_core() |
| |
Commit-ID: 76846bf3cb09e98881cb4908385a0e899716b01f Gitweb: http://git.kernel.org/tip/76846bf3cb09e98881cb4908385a0e899716b01f Author: Josh Poimboeuf <jpoimboe@redhat.com> AuthorDate: Tue, 11 Jul 2017 10:33:45 -0500 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Tue, 18 Jul 2017 10:57:44 +0200
x86/asm: Add unwind hint annotations to sync_core()
This enables objtool to grok the iret in the middle of a C function.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jiri Slaby <jslaby@suse.cz> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/b057be26193c11d2ed3337b2107bc7adcba42c99.1499786555.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/include/asm/processor.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 6a79547..b27dc9b 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -22,6 +22,7 @@ struct vm86; #include <asm/nops.h> #include <asm/special_insns.h> #include <asm/fpu/types.h> +#include <asm/unwind_hints.h> #include <linux/personality.h> #include <linux/cache.h> @@ -684,6 +685,7 @@ static inline void sync_core(void) unsigned int tmp; asm volatile ( + UNWIND_HINT_SAVE "mov %%ss, %0\n\t" "pushq %q0\n\t" "pushq %%rsp\n\t" @@ -693,6 +695,7 @@ static inline void sync_core(void) "pushq %q0\n\t" "pushq $1f\n\t" "iretq\n\t" + UNWIND_HINT_RESTORE "1:" : "=&r" (tmp), "+r" (__sp) : : "cc", "memory"); #endif
| |