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From: "luis.machado at arm dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/31531] New: [aarch64,sme] gdb doesn't restore the vg
 register properly when dealing with streaming functions
Date: Fri, 22 Mar 2024 15:00:42 +0000
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X-Bugzilla-Version: HEAD
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X-Bugzilla-Who: luis.machado at arm dot com
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31531

            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 fra=
me,
gdb will display their contents incorrectly.

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

--=20
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