[Bug libc/17555] New: [AARCH64][GLIBC]glibc's _start dosen't terminate the frame record chain correctly

["marcus.shawcroft at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17555

            Bug ID: 17555
           Summary: [AARCH64][GLIBC]glibc's _start dosen't terminate the
                    frame record chain correctly
           Product: glibc
           Version: 2.20
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: marcus.shawcroft at gmail dot com
                CC: drepper.fsp at gmail dot com

In glibc-2.20/sysdeps/aarch64/start.S we find:
_start:
/* Create an initial frame with 0 LR and FP */
mov    x29, #0
mov    x30, #0
mov    x29, sp

Because of the way _start is implemented, the end of the frame record
chain is not indicated by zero but instead by the value of
argc, because that's the first value on the initial stack.

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