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 += $file"
  57
  58   # Emit a compilation rule for this syscall.
  59   echo "\
  60 \$(foreach o,\$(object-suffixes),\$(objpfx)$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 or versions defined for this syscall function.
  68
  69   # A shortcoming in the current gas is that it will only allow one
  70   # version-alias per symbol.  So we create new strong aliases as needed.
  71   vcount=""
  72
  73   for name in $weak; do
  74     case $name in
  75       *@@*)
  76         base=`echo $name | sed 's/@.*//'`
  77         ver=`echo $name | sed 's/@.*//'`
  78         if test -z "$vcount" ; then
  79           source=$strong
  80           vcount=1
  81         else
  82           source="${strong}_${vcount}"
  83           vcount=`expr $vcount + 1`
  84           echo "         echo 'strong_alias ($strong, $source)'; \\"
  85         fi
  86         echo "   echo 'default_symbol_version($source, $base, $ver)'; \\"
  87         ;;
  88       *@*)
  89         base=`echo $name | sed 's/@.*//'`
  90         ver=`echo $name | sed 's/.*@//'`
  91         if test -z "$vcount" ; then
  92           source=$strong
  93           vcount=1
  94         else
  95           source="${strong}_${vcount}"
  96           vcount=`expr $vcount + 1`
  97           echo "         echo 'strong_alias ($strong, $source)'; \\"
  98         fi
  99         echo "   echo 'symbol_version($source, $base, $ver)'; \\"
 100         ;;
 101       *)
 102         echo "   echo 'weak_alias ($strong, $name)'; \\"
 103         ;;
 104     esac
 105   done
 106
 107   # And finally, pipe this all into the compiler.
 108   echo '        ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
 109
 110   echo endif
 111
 112 done