[Bug libc/18707] New: [aarch64] libc profiling (with --enable-profile) is broken

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18707

            Bug ID: 18707
           Summary: [aarch64] libc profiling (with --enable-profile) is
                    broken
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The CALL_MCOUNT macro (sysdeps/aarch64/sysdep.h) used in glibc internal asm
files does not save/restore argument registers of the instrumented function.

(In the aarch64 profiling ABI the compiler knows about the inserted mcount call
and does the necessary register spills, but that does not happen in the asm
functions.)

Only broken when the libc itself is profiled.

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