[Bug binutils/21446] Incorrect disassembly for msr to dbgdtrtx_el0 in AArch64

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21446

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Tamar Christina
<address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7d02540ab73206249779ced77a6abe0be156442e

commit 7d02540ab73206249779ced77a6abe0be156442e
Author: Tamar Christina <address@hidden>
Date:   Tue May 15 16:34:54 2018 +0100

    Allow non-fatal errors to be emitted and for disassembly notes be placed on
AArch64

    This patch adds a new platform option "notes" that can be used to indicate
if
    disassembly notes should be placed in the disassembly as comments.

    These notes can contain information about a failing constraint such as
reading
    from a write-only register.  The disassembly will not be blocked because of
this
    but -M notes will emit a comment saying that the operation is not allowed.

    For assembly this patch adds a new non-fatal status for errors.  This is
    essentially a warning.  The reason for not creating an actual warning type
is
    that this causes the interaction between the ordering of warnings and
errors to
    be problematic.  Currently the error buffer is almost always filled because
of
    the way operands are matched during assembly. An earlier template may have
put
    an error there that would only be displayed if no other template matches or
    generates a higher priority error.  But by definition a warning is lower
    priority than a warning, so the error (which is incorrect if another
template
    matched) will supersede the warning.  By treating warnings as errors and
only
    later relaxing the severity this relationship keeps working and the
existing
    reporting infrastructure can be re-used.

    binutils/

        PR binutils/21446
        * doc/binutils.texi (-M): Document AArch64 options.
        * NEWS: Document notes and warnings.

    gas/

        PR binutils/21446
        * config/tc-aarch64.c (print_operands): Indicate no notes.
        (output_operand_error_record): Support non-fatal errors.
        (output_operand_error_report, warn_unpredictable_ldst, md_assemble):
        Likewise.

    include/

        PR binutils/21446
        * opcode/aarch64.h (aarch64_operand_error): Add non_fatal.
        (aarch64_print_operand): Support notes.

    opcodes/

        PR binutils/21446
        * aarch64-dis.c (no_notes: New.
        (parse_aarch64_dis_option): Support notes.
        (aarch64_decode_insn, print_operands): Likewise.
        (print_aarch64_disassembler_options): Document notes.
        * aarch64-opc.c (aarch64_print_operand): Support notes.

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