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#! /bin/sh
# Usage: make-syscalls.sh ../sysdeps unix/common
# Expects $sysdirs in environment.
sysbase=$1; shift
thisdir=$1; shift
# Get the list of system calls for this directory.
calls=`sed 's/#.*$//
/^[ ]*$/d' $sysbase/$thisdir/syscalls.list`
# Check each sysdep dir with higher priority than this one,
# and remove from $calls all the functions found in other dirs.
for dir in $sysdirs; do
# Punt when we reach the directory defining these syscalls.
test $dir = $thisdir && break
# Remove each syscall that is implemented by a file in $dir.
# If a syscall specified a "caller", then only compile that syscall
# if the caller function is also implemented in this directory.
calls=`echo "$calls" | while read file caller rest; do
test -f $sysbase/$dir/$file.c && continue
test -f $sysbase/$dir/$file.S && continue
test -f $sysbase/$dir/$file.s && continue
if test x$caller != x-; then
test -f $sysbase/$dir/$caller.c && continue
test -f $sysbase/$dir/$caller.S && continue
test -f $sysbase/$dir/$caller.s && continue
fi
echo $file $caller $rest
done`
done
# Any calls left?
test -n "$calls" || exit 0
files=
# Emit rules to compile the syscalls remaining in $calls.
echo "$calls" | while read file caller syscall nargs strong weak; do
# Figure out if $syscall is defined with a number in syscall.h.
$asm_CPP - << EOF | grep "^@@@ .*$syscall" >/dev/null && continue
#include <sysdep.h>
@@@ SYS_ify ($syscall)
EOF
# Make sure only the first syscall rule is used, if multiple dirs
# define the same syscall.
echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
# Accumulate the list of syscall files for this directory.
echo "unix-syscalls += $file"
test x$caller = x- || echo "unix-extra-syscalls += $file"
# Emit a compilation rule for this syscall.
echo "\
\$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o): \$(objpfx)s-proto.d
(echo '#include <sysdep.h>'; \\
echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
echo ' ret'; \\
echo 'END($strong)'; \\"
# Append any weak aliases defined for this syscall function.
for name in $weak; do
echo " echo 'weak_alias ($strong, $name)'; \\"
done
# And finally, pipe this all into the compiler.
echo ' ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
echo endif
done
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