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+.\" $NetBSD: STACK.9,v 1.2 2011/04/08 07:55:04 jruoho Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jukka Ruohonen.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd April 8, 2011
+.Dt STACK 9
+.Os
+.Sh NAME
+.Nm STACK
+.Nd stack macros
+.Sh SYNOPSIS
+.In sys/param.h
+.Ft type
+.Fn STACK_ALLOC "sp" "size"
+.Ft type
+.Fn STACK_MAX "sp" "size"
+.Ft type
+.Fn STACK_ALIGN "sp" "bytes"
+.Ft type
+.Fn STACK_GROW "sp" "size"
+.Ft type
+.Fn STACK_SHRINK "sp" "size"
+.Sh DESCRIPTION
+A stack is an area of memory with a fixed origin but with a variable size.
+A stack pointer points to the most recently referenced location on the stack.
+Initially, when the stack has a size of zero,
+the stack pointer points to the origin of the stack.
+When data items are added to the stack,
+the stack pointer moves away from the origin.
+.Pp
+The
+.Fn STACK_ALLOC
+macro returns a pointer to allocated stack space of some
+.Fa size .
+Given the returned pointer
+.Fa sp
+and
+.Fa size ,
+.Fn STACK_MAX
+returns the maximum stack address of the allocated stack space.
+The
+.Fn STACK_ALIGN
+macro can be used to align the stack pointer
+.Fa sp
+by the specified amount of
+.Fa bytes .
+.Pp
+Two basic operations are common to all stacks:
+a data item is added
+.Pq Dq push
+to the location pointed by
+.Fa sp
+or a data item is removed
+.Pq Dq pop
+from the stack.
+The stack pointer must be subsequently adjusted by the size of the data item.
+The
+.Fn STACK_GROW
+and
+.Fn STACK_SHRINK
+macros adjust the stack pointer
+.Fa sp
+by given
+.Fa size .
+.Pp
+A stack may grow either up or down.
+The described macros take this into account by using the
+.Dv __MACHINE_STACK_GROWS_UP
+preprocessor define.
+.Sh SEE ALSO
+.Xr param 3 ,
+.Xr queue 3