You can assign a section to a previously defined program segment by
using :phdr. See PHDRS. If a section is assigned to
one or more segments, then all subsequent allocated sections will be
assigned to those segments as well, unless they use an explicitly
:phdr modifier. You can use :NONE to tell the
linker to not put the section in any segment at all.
Here is a simple example:
PHDRS { text PT_LOAD ; }
SECTIONS { .text : { *(.text) } :text }