svn commit: r274279 - head/sys/amd64/amd64

[Konstantin Belousov]

Author: kib
Date: Sat Nov  8 11:56:26 2014
New Revision: 274279
URL: https://svnweb.freebsd.org/changeset/base/274279

Log:
  MFi386 r253328:
  Create a proper stack frame for amd64 version of bcopy().  Note that
  this also makes the stack properly aligned in the function, despite it
  is not strictly needed.
  
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/amd64/amd64/support.S

Modified: head/sys/amd64/amd64/support.S
==============================================================================
--- head/sys/amd64/amd64/support.S	Sat Nov  8 07:54:34 2014	(r274278)
+++ head/sys/amd64/amd64/support.S	Sat Nov  8 11:56:26 2014	(r274279)
@@ -100,6 +100,8 @@ END(bcmp)
  *  ws at tools.de     (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
  */
 ENTRY(bcopy)
+	pushq	%rbp
+	movq	%rsp,%rbp
 	xchgq	%rsi,%rdi
 	movq	%rdx,%rcx
 
@@ -116,6 +118,7 @@ ENTRY(bcopy)
 	andq	$7,%rcx				/* any bytes left? */
 	rep
 	movsb
+	popq	%rbp
 	ret
 
 	/* ALIGN_TEXT */
@@ -135,6 +138,7 @@ ENTRY(bcopy)
 	rep
 	movsq
 	cld
+	popq	%rbp
 	ret
 END(bcopy)