[PATCH] Replace ROUND with ALIGN_UP by p_align [BZ #22370]

[H.J. Lu]

On Sat, Nov 11, 2017 at 4:39 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> On Nov 10 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>
>> All notes in a PT_NOTE segment have the same alignment,  Otherwise,
>> one can't parse PT_NOTE segment.
>
> But the ABI says that the name and data size is always aligned to the
> word size.  That is independent of the padding between notes.
>

The gABI says:

In 64-bit objects (files with e_ident[EI_CLASS] equal to ELFCLASS64),
each entry is an array of 8-byte words in the format of the target
processor. In 32-bit objects (files with e_ident[EI_CLASS] equal to
ELFCLASS32), each entry is an array of 4-byte words in the format of
the target processor.

Since .note.ABI-tag and .note.gnu.build-id notes are aligned to 4
bytes in 64-bit object while .note.gnu.property notes are aligned
to 8 bytes in 64-bit object, we have to check p_align in program
header for note alignment in PT_NOTE segments.

-- 
H.J.