.p2align[wl] [abs-expr[, abs-expr[, abs-expr]]], Up: Assembler Directives [Contents][Index]
This is one of the ELF section stack manipulation directives. The others are
.pushsection name [, subsection] [, "flags"[, @type[,arguments]]]), and
This directive replaces the current section (and subsection) with the top section (and subsection) on the section stack. This section is popped off the stack.