RFC: Alignment and sizes of .note.ABI-tag and .note.gnu.build-id in 64-bit ELF objects

[Nicholas Miell]

On 03/31/2017 10:17 AM, H.J. Lu wrote:
> According to gABI, in 64-bit objects, each note entry is an array of 8-bye
> words in the format of the target processor.  But I got
>
>   [ 2] .note.ABI-tag     NOTE            0000000000000254 000254
> 000020 00   A  0   0  4
>   [ 3] .note.gnu.build-id NOTE            0000000000000274 000274
> 000024 00   A  0   0  4
>
> on x86-64.  .note.ABI-tag size is 32, but it isn't aligned at 8 bytes.
> .note.gnu.build-id size is 36, which isn't multiple of 8 bytes.  Should
> they be padded to multiple of 8 bytes and aligned to 8 bytes for 64-bit
> objects?
>

The spec is wrong, ELF notes are always arrays of 4-byte words in the 
format of the target processor.