[Bug gas/21816] New: Gnu Assembler for aarch64 injecting alignment bytes for aligned data

[mark4th at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21816

            Bug ID: 21816
           Summary: Gnu Assembler for aarch64 injecting alignment bytes
                    for aligned data
           Product: binutils
           Version: 2.28
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: mark4th at gmail dot com
  Target Milestone: ---

I have a sub-macro that lays down a .ascii string and then aligns the assemby
to a 32 bit address (4 bytes) using .align 4.

On armv7a this works fine.  on aarch64 when the address is already aligned it
the assembler injects 8 bytes of zeros as shown in the following...

    df08:       00000000        .word   0x00000000  ; 64 bit link to previous
item
    df0c:       00000000        .word   0x00000000  ; there is no previous item
    df10:       69726f06        .word   0x69726f06  ; ascii string starting
with
    df14:       6967            .short  0x6967      ; a count byte 6, "origin"
    df16:       6e              .byte   0x6e
    df17:       00              .byte   0x00        ; .align 4
    df18:       0000a090        .word   0x0000a090  ; address of code
associated 
    df1c:       00000000        .word   0x00000000  ; with this symbol

everything looks great so far...

    df20:       0000df10        .word   0x0000df10  ; link to previous items 
    df24:       00000000        .word   0x00000000  ; string not to its link
    df28:       72657607        .word   0x72657607  ; 7, "version"
    df2c:       6e6f6973        .word   0x6e6f6973
we are now at the point where the macro that layed down the above string
attempts to align the data to a 32 bit address with the .align 4

*** df30:       00000000        .word   0x00000000  ; bogus alignment bytes and

    df34:       00000000        .word   0x00000000  ; link code associated with
    df38:       0000a0a8        .word   0x0000a0a8  ; this symbol

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