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From: Joseph Koshy <jkoshy@FreeBSD.org>
Date: Sun, 14 Dec 2008 09:06:28 +0000 (UTC)
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Subject: svn commit: r186076 - head/sys/amd64/amd64
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Author: jkoshy
Date: Sun Dec 14 09:06:28 2008
New Revision: 186076
URL: http://svn.freebsd.org/changeset/base/186076

Log:
  Bug fix: %ebx needs to be preserved in the user callchain capture
  path.

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

Modified: head/sys/amd64/amd64/exception.S
==============================================================================
--- head/sys/amd64/amd64/exception.S	Sun Dec 14 06:40:04 2008	(r186075)
+++ head/sys/amd64/amd64/exception.S	Sun Dec 14 09:06:28 2008	(r186076)
@@ -459,9 +459,9 @@ nmi_calltrap:
 	 */
 	movq	%rsp,%rsi	/* source stack pointer */
 	movq	$TF_SIZE,%rcx
-	movq	PCPU(RSP0),%rbx
-	subq	%rcx,%rbx
-	movq	%rbx,%rdi	/* destination stack pointer */
+	movq	PCPU(RSP0),%rdx
+	subq	%rcx,%rdx
+	movq	%rdx,%rdi	/* destination stack pointer */
 
 	shrq	$3,%rcx		/* trap frame size in long words */
 	cld
@@ -470,7 +470,7 @@ nmi_calltrap:
 
 	movl	%ss,%eax
 	pushq	%rax		/* tf_ss */
-	pushq	%rbx		/* tf_rsp (on kernel stack) */
+	pushq	%rdx		/* tf_rsp (on kernel stack) */
 	pushfq			/* tf_rflags */
 	movl	%cs,%eax
 	pushq	%rax		/* tf_cs */