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From: Jilles Tjoelker <jilles@FreeBSD.org>
Date: Mon, 9 Jun 2014 21:35:37 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r267307 - in head/lib/libc: amd64/gen i386/gen
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Author: jilles
Date: Mon Jun  9 21:35:36 2014
New Revision: 267307
URL: http://svnweb.freebsd.org/changeset/base/267307

Log:
  siglongjmp(): Preserve floating point exception flags on i386 and amd64.
  
  Per POSIX, siglongjmp() shall be equivalent to longjmp() except that it must
  match sigsetjmp() instead of setjmp() and except for the effect on the
  signal mask. Therefore, it should preserve the floating point exception
  flags.
  
  This was fixed for longjmp() and _longjmp() in r180080 and r180081 for amd64
  and i386 respectively.

Modified:
  head/lib/libc/amd64/gen/sigsetjmp.S
  head/lib/libc/i386/gen/sigsetjmp.S

Modified: head/lib/libc/amd64/gen/sigsetjmp.S
==============================================================================
--- head/lib/libc/amd64/gen/sigsetjmp.S	Mon Jun  9 21:06:46 2014	(r267306)
+++ head/lib/libc/amd64/gen/sigsetjmp.S	Mon Jun  9 21:35:36 2014	(r267307)
@@ -105,7 +105,6 @@ ENTRY(__siglongjmp)
 	movq	40(%rdx),%r13
 	movq	48(%rdx),%r14
 	movq	56(%rdx),%r15
-	fninit
 	fldcw	64(%rdx)
 	testq	%rax,%rax
 	jnz	1f

Modified: head/lib/libc/i386/gen/sigsetjmp.S
==============================================================================
--- head/lib/libc/i386/gen/sigsetjmp.S	Mon Jun  9 21:06:46 2014	(r267306)
+++ head/lib/libc/i386/gen/sigsetjmp.S	Mon Jun  9 21:35:36 2014	(r267307)
@@ -115,7 +115,6 @@ ENTRY(__siglongjmp)
 	movl	12(%edx),%ebp
 	movl	16(%edx),%esi
 	movl	20(%edx),%edi
-	fninit
 	fldcw	24(%edx)
 	testl	%eax,%eax
 	jnz	1f