\" $NetBSD: genassym.1,v 1.5 2010/04/13 09:01:10 jruoho Exp $
\"
\" Copyright (c) 1997 Matthias Pfaller.
\" All rights reserved.
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\" modification, are permitted provided that the following conditions
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Dd April 13, 2010
Dt GENASSYM 1
Os
Sh NAME
Nm genassym
Nd emit an assym.h file
Sh SYNOPSIS
Nm genassym
Op Fl c
Op Fl f
Ar C compiler invocation
Sh DESCRIPTION
Nm
is a shell script normally used during the kernel build process to
create an assym.h file.
This file defines a number of cpp constants derived from the configuration
information
Nm
reads from stdin. The generated file is used by kernel sources
written in assembler to gain access to information (e.g. structure
offsets and sizes) normally only known to the C compiler.
Pp
Arguments to
Nm
are usually of the form
Ar ${CC} ${CFLAGS} ${CPPFLAGS}
where
Ar ${CC}
is the C compiler used to compile the kernel, while
Ar ${CFLAGS}
and
Ar ${CPPFLAGS}
are flag arguments to the C compiler. The script creates a C source file
from its input. Then the C compiler is called according to the script's
arguments to compile this file.
Pp
Normally
Nm
instructs the C compiler to create an assembler source from the constructed
C source. The resulting file is then processed to extract the information
needed to create the assym.h file. The
Fl c
flag instructs
Nm
to create slightly different code, generate an executable from this code
and run it. In both cases the assym.h file is written to stdout.
The
Fl f
flag instructs
Nm
to create forth code.
Sh DIAGNOSTICS
Either self-explanatory, or generated by one of the programs
called from the script.
Sh SEE ALSO
Xr genassym.cf 5
Sh HISTORY
The
Nm
command appeared in
Nx 1.3
as
Dq genassym.sh
in
Pa /usr/src/sys/kern .
It became a userland utility in
Nx 4.0 .
