1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
new file mode 100644
index 0000000000..ff4b082b11
--- /dev/null
+++ b/sysdeps/unix/make-syscalls.sh
@@ -0,0 +1,76 @@
+#! /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'; \\"
+
+  # 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