The ALIGN attribute is used to specify the alignment for a loadable segment. The value specified is set in the p_align field of the program header corresponding to the segment. Segment alignment is used in calculating the virtual address of the beginning of the segment.
The alignment specified must be a power of 2. By default, the link-editor sets the alignment of a segment to the built-in default. This default differs from one CPU to another and might even be different between software revisions.
The ALIGN attribute is mutually exclusive to the PADDR and VADDR attributes, and cannot be used with them. When PADDR or VADDR is specified, the p_align field of the corresponding program header will be set to the default value.