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\" Copyright (c) 1997 Matthias Pfaller.
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Dd August 18, 2005
Dt GENASSYM.CF 5
Os
Sh NAME
Nm genassym.cf
Nd assym.h definition file
Sh DESCRIPTION
The
Nm
file is used by
Xr genassym 1
to make constant C expressions known to assembler source files.
Lines starting with '#' are discarded by
Xr genassym 1 .
Lines starting with
Em include ,
Em ifdef ,
Em if ,
Em else
or
Em endif
are preceded with '#' and passed otherwise unmodified to the C compiler.
Lines starting with
Em quote
get passed on with the
Em quote
command removed.
The first word after a
Em define
command is taken as a CPP identifier and the rest of the line has to be
a constant C expression. The output of
Xr genassym 1
will assign the numerical value of this expression to the CPP identifier.
Em "export X"
is a shorthand for
Em "define X X" .
Em "struct X"
remembers X for the
Em member
command and does a
Em "define X_SIZEOF sizeof(X)" .
Em "member X"
does a
Em "define X offsetof(<last struct>, X)" .
Em "config <ctype> <gcc constraint> <asm print modifier>"
can be used to customize the output of
Xr genassym 1 .
When producing C output, values are casted to <ctype> (default: long)
before they get handed to printf. <gcc constraint> (default: n) is the
constraint used in the __asm__ statements. <asm print modifier> (default:
empty) can be used to force gcc to output operands in different ways
then normal. The "a" modifier e.g. stops gcc from emitting immediate
prefixes in front of constants for the i386 and m68k port.
Sh FILES
Pa /usr/src/sys/arch/${MACHINE}/${MACHINE}/genassym.cf
Sh SEE ALSO
Xr genassym 1
Sh HISTORY
The
Nm
file appeared in
Nx 1.3 .

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