svn commit: r186076 - head/sys/amd64/amd64

[Garrett Cooper]

On Sun, Dec 14, 2008 at 1:06 AM, Joseph Koshy <jkoshy at freebsd.org> wrote:
> 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 */

Stupid question -- where's the change? All I see are potentially
whitespace modifications..
-Garrett