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From: Bruce Evans <bde@FreeBSD.org>
Date: Sat, 2 Jun 2018 09:59:27 +0000 (UTC)
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Subject: svn commit: r334528 - head/sys/i386/include
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Author: bde
Date: Sat Jun  2 09:59:27 2018
New Revision: 334528
URL: https://svnweb.freebsd.org/changeset/base/334528

Log:
  Oops, the last minute reduction in the clobber list for i386
  MCOUNT_OVERHEAD() in r334522 was too agressive.  Only mcount exit
  preserves %eax and %edx.

Modified:
  head/sys/i386/include/profile.h

Modified: head/sys/i386/include/profile.h
==============================================================================
--- head/sys/i386/include/profile.h	Sat Jun  2 08:46:09 2018	(r334527)
+++ head/sys/i386/include/profile.h	Sat Jun  2 09:59:27 2018	(r334528)
@@ -64,7 +64,7 @@
 	__asm __volatile("pushl %0; call __mcount; popl %%ecx"		\
 			 :						\
 			 : "i" (label)					\
-			 : "cx", "memory")
+			 : "ax", "dx", "cx", "memory")
 #define	MEXITCOUNT_OVERHEAD()						\
 	__asm __volatile("call .mexitcount; 1:"				\
 			 : :						\