sysdeps/unix/make-syscalls.sh

   1 #! /bin/sh
   2
   3 # Usage: make-syscalls.sh ../sysdeps/unix/common
   4 # Expects $sysdirs in environment.
   5
   6 thisdir=$1; shift
   7
   8 # Get the list of system calls for this directory.
   9 calls=`sed 's/#.*$//
  10 /^[     ]*$/d' $thisdir/syscalls.list`
  11
  12 # Check each sysdep dir with higher priority than this one,
  13 # and remove from $calls all the functions found in other dirs.
  14 for dir in $sysdirs; do
  15
  16   # Punt when we reach the directory defining these syscalls.
  17   test $dir = $thisdir && break
  18
  19   # Remove each syscall that is implemented by a file in $dir.
  20   # If a syscall specified a "caller", then only compile that syscall
  21   # if the caller function is also implemented in this directory.
  22   calls=`echo "$calls" | while read file caller rest; do
  23            test -f $dir/$file.c && continue
  24            test -f $dir/$file.S && continue
  25            test -f $dir/$file.s && continue
  26            if test x$caller != x-; then
  27              test -f $dir/$caller.c && continue
  28              test -f $dir/$caller.S && continue
  29              test -f $dir/$caller.s && continue
  30            fi
  31            echo $file $caller $rest
  32          done`
  33
  34 done
  35
  36 # Any calls left?
  37 test -n "$calls" || exit 0
  38
  39 files=
  40
  41 # Emit rules to compile the syscalls remaining in $calls.
  42 echo "$calls" | while read file caller syscall nargs strong weak; do
  43
  44   # Figure out if $syscall is defined with a number in syscall.h.
  45   $asm_CPP - << EOF | grep "^@@@ .*$syscall" >/dev/null && continue
  46 #include <sysdep.h>
  47 @@@ SYS_ify ($syscall)
  48 EOF
  49
  50   # Make sure only the first syscall rule is used, if multiple dirs
  51   # define the same syscall.
  52   echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
  53
  54   # Accumulate the list of syscall files for this directory.
  55   echo "unix-syscalls += $file"
  56   test x$caller = x- || echo "unix-extra-syscalls += $file"
  57
  58   # Emit a compilation rule for this syscall.
  59   echo "\
  60 \$(foreach o,\$(all-object-suffixes),\$(objpfx)$file\$o): \\
  61 \$(common-objpfx)s-proto.d
  62         (echo '#include <sysdep.h>'; \\
  63          echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
  64          echo ' ret'; \\
  65          echo 'PSEUDO_END($strong)'; \\"
  66
  67   # Append any weak aliases defined for this syscall function.
  68   for name in $weak; do
  69     echo "       echo 'weak_alias ($strong, $name)'; \\"
  70   done
  71
  72   # And finally, pipe this all into the compiler.
  73   echo '        ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
  74
  75   echo endif
  76
  77 done