gdb/2469: no mmx when debugging in x86_64 program

[drs@vzg.nl]

>Number:         2469
>Category:       gdb
>Synopsis:       no mmx when debugging in x86_64 program
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          maintenance
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 17 15:58:01 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     dancie reeves
>Release:        gdb 6.8
>Organization:
>Environment:
linux fedora 9 x86_64
>Description:
The printing of the mmx registers disappear when a 64 bit program is loaded.  When gdb is started and "maintenance print registers" command is given you get the normal 32 bit register display with the mmx registers. But when a 64 bit program is loaded "maintenance print registers" gives the correct state (16 integer, 16 xmm registers,floating point,etc.) but no mmx is printed, and the command 'p/x $mm0' returns "Value can't be converted to integer"
>How-To-Repeat:
Just load a 64 bit program to debug.
>Fix:
?
>Release-Note:
>Audit-Trail:
>Unformatted: