sysdeps/unix/make-syscalls.sh

   1 #! /bin/sh
   2
   3 # Usage: make-syscalls.sh ../sysdeps/unix/common
   4 # Expects $sysdirs in environment.
   5
   6 ##############################################################################
   7
   8 # Syscall Signature Key Letters for BP Thunks:
   9 #
  10 # a: unchecked address (e.g., 1st arg to mmap)
  11 # b: non-NULL buffer (e.g., 2nd arg to read; return value from mmap)
  12 # B: optionally-NULL buffer (e.g., 4th arg to getsockopt)
  13 # f: buffer of 2 ints (e.g., 4th arg to socketpair)
  14 # F: 3rd arg to fcntl
  15 # i: scalar (any signedness & size: int, long, long long, enum, whatever)
  16 # I: 3rd arg to ioctl
  17 # n: scalar buffer length (e.g., 3rd arg to read)
  18 # N: pointer to value/return scalar buffer length (e.g., 6th arg to recvfrom)
  19 # p: non-NULL pointer to typed object (e.g., any non-void* arg)
  20 # P: optionally-NULL pointer to typed object (e.g., 2nd argument to gettimeofday)
  21 # s: non-NULL string (e.g., 1st arg to open)
  22 # S: optionally-NULL string (e.g., 1st arg to acct)
  23 # v: vararg scalar (e.g., optional 3rd arg to open)
  24 # V: byte-per-page vector (3rd arg to mincore)
  25 # W: wait status, optionally-NULL pointer to int (e.g., 2nd arg of wait4)
  26
  27 ptr='[abBfFINpPsSWV]'   # all pointer keyletters
  28 int='[inv]'             # all scalar keyletters
  29 typ='[ifnNpP]'          # typed-arg keyletters: we capture type for use in thunk
  30
  31 ##############################################################################
  32
  33 thisdir=$1; shift
  34
  35 echo ''
  36 echo \#### DIRECTORY = $thisdir
  37 # Check each sysdep dir with higher priority than this one,
  38 # and remove from $calls all the functions found in other dirs.
  39 # Punt when we reach the directory defining these syscalls.
  40 sysdirs=`for dir in $sysdirs; do
  41          test $dir = $thisdir && break; echo $dir; done`
  42 echo \#### SYSDIRS = $sysdirs
  43
  44 # Get the list of system calls for this directory.
  45 calls=`sed 's/#.*$//
  46 /^[     ]*$/d' $thisdir/syscalls.list`
  47
  48 calls=`echo "$calls" |
  49 while read file caller rest; do
  50   # Remove each syscall that is implemented by a file in $dir.
  51   # If a syscall specified a "caller", then only compile that syscall
  52   # if the caller function is also implemented in this directory.
  53   srcfile=-;
  54   for dir in $sysdirs; do
  55      { test -f $dir/$file.c && srcfile=$dir/$file.c; } ||
  56      { test -f $dir/$file.S && srcfile=$dir/$file.S; } ||
  57      { test -f $dir/$file.s && srcfile=$dir/$file.s; } ||
  58      { test x$caller != x- &&
  59         { { test -f $dir/$caller.c && srcfile=$dir/$caller.c; } ||
  60           { test -f $dir/$caller.S && srcfile=$dir/$caller.S; } ||
  61           { test -f $dir/$caller.s && srcfile=$dir/$caller.s; }; }; } && break;
  62   done;
  63   echo $file $srcfile $caller $rest;
  64 done`
  65
  66 # Any calls left?
  67 test -n "$calls" || exit 0
  68
  69 # Emit rules to compile the syscalls remaining in $calls.
  70 echo "$calls" |
  71 while read file srcfile caller syscall args strong weak; do
  72
  73   # Figure out if $syscall is defined with a number in syscall.h.
  74   callnum=-
  75   eval `{ echo "#include <sysdep.h>";
  76         echo "callnum=SYS_ify ($syscall)"; } |
  77           $asm_CPP - |sed -n -e "/^callnum=.*$syscall/d" \
  78                              -e "/^\(callnum=\)[        ]*\(.*\)/s//\1'\2'/p"`
  79
  80   # Derive the number of arguments from the argument signature
  81   case $args in
  82   [0-9]) nargs=$args;;
  83   ?:) nargs=0;;
  84   ?:?) nargs=1;;
  85   ?:??) nargs=2;;
  86   ?:???) nargs=3;;
  87   ?:????) nargs=4;;
  88   ?:?????) nargs=5;;
  89   ?:??????) nargs=6;;
  90   ?:???????) nargs=7;;
  91   ?:????????) nargs=8;;
  92   ?:?????????) nargs=9;;
  93   esac
  94
  95   # Make sure only the first syscall rule is used, if multiple dirs
  96   # define the same syscall.
  97   echo ''
  98   echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
  99
 100  case x$srcfile"$callnum" in
 101  x*-) ;; ### Do nothing for undefined callnum
 102  x-*)
 103   echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
 104
 105   case $weak in
 106   *@*)
 107     # The versioned symbols are only in the shared library.
 108     echo "ifneq (,\$(filter .os,\$(object-suffixes)))"
 109     ;;
 110   esac
 111   # Accumulate the list of syscall files for this directory.
 112   echo "unix-syscalls += $file"
 113   test x$caller = x- || echo "unix-extra-syscalls += $file"
 114
 115   # Emit a compilation rule for this syscall.
 116   case $weak in
 117   *@*)
 118     # The versioned symbols are only in the shared library.
 119     echo "\
 120 shared-only-routines += $file
 121 \$(objpfx)${file}.os: \\"
 122     ;;
 123   *)
 124     echo "\
 125 \$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o): \\"
 126     ;;
 127   esac
 128   echo "                \$(common-objpfx)s-proto.d
 129         (echo '#include <sysdep.h>'; \\
 130          echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
 131          echo ' ret'; \\
 132          echo 'PSEUDO_END($strong)'; \\"
 133
 134   # Append any weak aliases or versions defined for this syscall function.
 135
 136   # A shortcoming in the current gas is that it will only allow one
 137   # version-alias per symbol.  So we create new strong aliases as needed.
 138   vcount=""
 139
 140   for name in $weak; do
 141     case $name in
 142       *@@*)
 143         base=`echo $name | sed 's/@@.*//'`
 144         ver=`echo $name | sed 's/.*@@//'`
 145         if test -z "$vcount" ; then
 146           source=$strong
 147           vcount=1
 148         else
 149           source="${strong}_${vcount}"
 150           vcount=`expr $vcount + 1`
 151           echo "         echo 'strong_alias ($strong, $source)'; \\"
 152         fi
 153         echo "   echo 'default_symbol_version($source, $base, $ver)'; \\"
 154         ;;
 155       *@*)
 156         base=`echo $name | sed 's/@.*//'`
 157         ver=`echo $name | sed 's/.*@//'`
 158         if test -z "$vcount" ; then
 159           source=$strong
 160           vcount=1
 161         else
 162           source="${strong}_${vcount}"
 163           vcount=`expr $vcount + 1`
 164           echo "         echo 'strong_alias ($strong, $source)'; \\"
 165         fi
 166         echo "   echo 'symbol_version($source, $base, $ver)'; \\"
 167         ;;
 168       *)
 169         echo "   echo 'weak_alias ($strong, $name)'; \\"
 170         ;;
 171     esac
 172   done
 173
 174   # And finally, pipe this all into the compiler.
 175   echo '        ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
 176
 177   case $weak in
 178   *@*)
 179     # The versioned symbols are only in the shared library.
 180     echo endif
 181     ;;
 182   esac
 183
 184   echo endif
 185  ;;
 186  esac
 187
 188   case x"$callnum",$srcfile,$args in
 189   x-,-,* | x*,*.[sS],*V*) ;;
 190   x*,-,*$ptr* | x*,*.[sS],*$ptr*)
 191
 192     nv_weak=`for name in $weak; do
 193                 case $name in
 194                 *@*) ;;
 195                 *) echo $name;;
 196                 esac; done`
 197
 198     # choose the name with the fewest leading underscores, preferably none
 199     set `echo $strong $nv_weak |tr '@ \t' ' \n\n' |sort -r`
 200     callname=$1
 201
 202     # convert signature string to individual numbered arg names
 203     # e.g., i:ipbN -> i0 i1 p2 b3 N4
 204     set `echo $args |
 205         sed -e 's/^\(.\):\(.*\)/\2 <\10>/' \
 206             -e 's/^\([^ ]\)\(.*\)/\2 <\11>/' \
 207             -e 's/^\([^ ]\)\(.*\)/\2 <\12>/' \
 208             -e 's/^\([^ ]\)\(.*\)/\2 <\13>/' \
 209             -e 's/^\([^ ]\)\(.*\)/\2 <\14>/' \
 210             -e 's/^\([^ ]\)\(.*\)/\2 <\15>/' \
 211             -e 's/^\([^ ]\)\(.*\)/\2 <\16>/' \
 212             -e 's/^\([^ ]\)\(.*\)/\2 <\17>/' \
 213             -e 's/^\([^ ]\)\(.*\)/\2 <\18>/' \
 214             -e 's/^\([^ ]\)\(.*\)/\2 <\19>/'`
 215     rtn=$1; shift
 216     args=$*
 217     arglist=`echo $* |sed 's/ /, /g'`
 218
 219     # The best way to understand what's going on here is to examine
 220     # the output in BUILDDIR/sysd-syscalls.
 221
 222     # generate makefile envelope & rule head
 223     echo "ifeq (,\$(filter $file,\$(bp-thunks)))"
 224     echo "bp-thunks += $file"
 225     echo "\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto.d"
 226
 227     # generate macro head
 228     echo "      (echo '#define $callname(`echo $arglist | \
 229             sed -e 's/[<>]//g'`) `echo $rtn | \
 230             sed -e 's/<\('$typ'0\)>/\1v;/g' \
 231                 -e 's/<\(b0\)>/x0; extern char \1v;/g'` \\'; \\"
 232
 233     # generate extern decls of dummy variables for each arg
 234     echo "       echo '`echo $args | \
 235             sed -e 's/<\('$typ'[1-9]\)>/extern \1, \1v;/g' \
 236                 -e 's/<\([abBFIsSV][1-9]\)>/extern char \1v;/g' \
 237                 -e 's/<\([Wv][1-9]\)>/extern int \1v;/g'` \\'; \\"
 238
 239     # generate bounded-pointer thunk declarator
 240     echo "       echo '`echo $rtn | \
 241             sed -e 's/<\('$ptr'0\)>/__typeof (\1v) *__bounded/g' \
 242                 -e 's/<\('$int'0\)>/__typeof (\1v)/g'` BP_SYM ($strong) (`echo $arglist | \
 243             sed -e 's/<\('$ptr'[1-9]\)>/__typeof (\1v) *__bounded \1a/g' \
 244                 -e 's/<\('$int'[1-9]\)>/__typeof (\1v) \1a/g'`) { \\'; \\"
 245
 246     # generate extern primitive syscall declaration
 247     echo "       echo '  extern `echo $rtn | \
 248             sed -e 's/<\('$ptr'0\)>/__typeof (\1v) *__unbounded/g' \
 249                 -e 's/<\('$int'0\)>/__typeof (\1v)/g'` ($callname) (`echo $arglist | \
 250             sed -e 's/<\('$ptr'[1-9]\)>/__typeof (\1v) *__unbounded/g' \
 251                 -e 's/<\('$int'[1-9]\)>/__typeof (\1v)/g'`); \\'; \\"
 252
 253     # generate call the primtive system call, optionally wrapping bounds
 254     # around the result if the signature's return keyletter is `b'.
 255     echo "       echo '  return `echo $rtn |
 256             sed -e 's/<b0>/BOUNDED_N (/' \
 257                 -e 's/<.0>//'`($callname) (`echo $arglist | \
 258             sed -e 's/<\(a[1-9]\)>/__ptrvalue (\1a)/g' \
 259                 -e 's/<\(n[1-9]\)>, <\(V[1-9]\)>/\1a, CHECK_N_PAGES (\2a, \1a)/g' \
 260                 -e 's/<\(b[1-9]\)>, <\(n[1-9]\)>/CHECK_N (\1a, \2a), \2a/g' \
 261                 -e 's/<\(b[1-9]\)>, <\(N[1-9]\)>/CHECK_N (\1a, *CHECK_1 (\2a)), __ptrvalue (\2a)/g' \
 262                 -e 's/<\(B[1-9]\)>, <\(n[1-9]\)>/CHECK_N_NULL_OK (\1a, \2a), \2a/g' \
 263                 -e 's/<\(B[1-9]\)>, <\(N[1-9]\)>/CHECK_N_NULL_OK (\1a, *CHECK_1 (\2a)), __ptrvalue (\2a)/g' \
 264                 -e 's/<\(f[1-9]\)>/CHECK_N (\1a, 2)/g' \
 265                 -e 's/<\(i[1-9]\)>, <\(F[1-9]\)>/\1a, CHECK_FCNTL (\2a, \1a)/g' \
 266                 -e 's/<\(i[1-9]\)>, <\(I[1-9]\)>/\1a, CHECK_IOCTL (\2a, \1a)/g' \
 267                 -e 's/<\(p[1-9]\)>/CHECK_1 (\1a)/g' \
 268                 -e 's/<\([PW][1-9]\)>/CHECK_1_NULL_OK (\1a)/g' \
 269                 -e 's/<\(s[1-9]\)>/CHECK_STRING (\1a)/g' \
 270                 -e 's/<\(S[1-9]\)>/CHECK_STRING_NULL_OK (\1a)/g' \
 271                 -e 's/<\([ivn][1-9]\)>/\1a/g'`)`echo $rtn $args |
 272             sed -e 's/<b0>.*<\(n[1-9]\)>.*/, \1a)/' \
 273                 -e 's/<.0>.*//'`; \\'; \\"
 274
 275     echo "       echo '} \\'; \\"
 276
 277     # generate thunk aliases
 278     for name in $nv_weak; do
 279       echo "     echo 'weak_alias (BP_SYM ($strong), BP_SYM ($name)) \\'; \\"
 280     done
 281
 282     # wrap up
 283     echo "\
 284          echo ''; \\
 285          echo '#include <bp-thunks.h>'; \\
 286         ) | \$(COMPILE.c) -x c -o \$@ -"
 287 ### Use this for debugging intermediate output:
 288 ###     ) >\$(@:.ob=.c)
 289 ###     \$(subst -c,-E,\$(COMPILE.c)) -o \$(@:.ob=.ib) \$(@:.ob=.c)
 290 ###     \$(COMPILE.c) -x cpp-output -o \$@ \$(@:.ob=.ib)"
 291     echo endif
 292     ;;
 293   esac
 294
 295 done