[Bug gas/20319] New: as and objdump allow "fmov sn, xm"

[cov at codeaurora dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=20319

            Bug ID: 20319
           Summary: as and objdump allow "fmov sn, xm"
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: cov at codeaurora dot org
  Target Milestone: ---

The assembler as assembles invalid fmov mnemonics and the disassembler objdump
disassembles invalid fmov-like opcodes as if they were valid/defined. The
situation arises if the destination register is 32 bits (for example s9) and
the source register is 64 bits (for example x0).

Steps to Reproduce as Issue:

echo fmov s9, x0 > astest.s
aarch64-linux-gnu-as astest.s -o astest

Actual Results: aarch64-linux-gnu-as completes successfully

Expected Results: aarch64-linux-gnu-as fails with informative message that only
32-bit source operands are permitted for fmov when a 32-bit destination operand
is used

Steps to Reproduce objdump Issue:

echo 0900279e | xxd -r -p > objtest
aarch64-linux-gnu-objdump -D -b binary -maarch64 objtest

Actual results: opcode disassembled as fmov s9, x0

Expected Results: opcode disassembled as .inst 0x0900279e ; undefined

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