[Bug gdb/31531] New: [aarch64,sme] gdb doesn't restore the vg register properly when dealing with streaming functions

["luis.machado at arm dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31531

            Bug ID: 31531
           Summary: [aarch64,sme] gdb doesn't restore the vg register
                    properly when dealing with streaming functions
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: luis.machado at arm dot com
  Target Milestone: ---

When gdb is dealing with streaming functions, the vg register (the vector
length) will change its value to that of the svg register.

If the vg and svg registers differ, when gdb attempts to unwind from a
streaming function through a non-streaming function, the frame with the
non-streaming function will contain the wrong vg register value.

If we have variables tied to the vg register value in the non-streaming frame,
gdb will display their contents incorrectly.

gdb needs to recognize vg was saved and follow the CFI rules to restore it.

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