[Bug binutils/31595] New: Abort in AArch64 disassembler's get_sreg_qualifier_from_value() function

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31595

            Bug ID: 31595
           Summary: Abort in AArch64 disassembler's
                    get_sreg_qualifier_from_value() function
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: nickc at redhat dot com
  Target Milestone: ---

Attempting to disassemble the latest version of glibc compiled for the AArch64
for Fedora Rawhide results in:

  $ objdump -D lib64/libc.so.6
  objdump: opcodes/aarch64-dis.c:251: get_sreg_qualifier_from_value: 
   Assertion `value <= 0x4 && aarch64_get_qualifier_standard_value (qualifier)
== value' failed.
  Abort (core dumped)

This was using the version of libc.so.6 obtained from
glibc-2.39.9000-10.fc41.aarch64.rpm but I can also reproduce the problem with a
libc.so.6 from RHEL-9.  I suspect that any recent-ish version of libc.so will
do.

I suspect that the issue is with the processing of the rcpc3 size field, since
the stack backtrace shows that get_sreg_qualifier_from_value is called from
do_special_decoding at opcodes/aarch64-dis.c:2678.

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