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   case x"$syscall" in
  74   x-) callnum=_ ;;
  75   *)
  76   # Figure out if $syscall is defined with a number in syscall.h.
  77   callnum=-
  78   eval `{ echo "#include <sysdep.h>";
  79         echo "callnum=SYS_ify ($syscall)"; } |
  80           $asm_CPP -D__OPTIMIZE__ - |
  81           sed -n -e "/^callnum=.*$syscall/d" \
  82                  -e "/^\(callnum=\)[    ]*\(.*\)/s//\1'\2'/p"`
  83   ;;
  84   esac
  85
  86   # Derive the number of arguments from the argument signature
  87   case $args in
  88   [0-9]) nargs=$args;;
  89   ?:) nargs=0;;
  90   ?:?) nargs=1;;
  91   ?:??) nargs=2;;
  92   ?:???) nargs=3;;
  93   ?:????) nargs=4;;
  94   ?:?????) nargs=5;;
  95   ?:??????) nargs=6;;
  96   ?:???????) nargs=7;;
  97   ?:????????) nargs=8;;
  98   ?:?????????) nargs=9;;
  99   esac
 100
 101   # Make sure only the first syscall rule is used, if multiple dirs
 102   # define the same syscall.
 103   echo ''
 104   echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
 105
 106  case x$srcfile"$callnum" in
 107  x*-) ;; ### Do nothing for undefined callnum
 108  x-*)
 109   echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
 110
 111   case $weak in
 112   *@*)
 113     # The versioned symbols are only in the shared library.
 114     echo "ifneq (,\$(filter .os,\$(object-suffixes)))"
 115     ;;
 116   esac
 117   # Accumulate the list of syscall files for this directory.
 118   echo "unix-syscalls += $file"
 119   test x$caller = x- || echo "unix-extra-syscalls += $file"
 120
 121   # Emit a compilation rule for this syscall.
 122   case $weak in
 123   *@*)
 124     # The versioned symbols are only in the shared library.
 125     echo "\
 126 shared-only-routines += $file
 127 \$(objpfx)${file}.os: \\"
 128     ;;
 129   *)
 130     echo "\
 131 \$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o): \\"
 132     ;;
 133   esac
 134
 135   echo '                $(common-objpfx)s-proto.d'
 136   case x"$callnum" in
 137   x_)
 138   echo "\
 139         (echo '/* Dummy module requested by syscalls.list */'; \\"
 140   ;;
 141   x*)
 142   echo "\
 143         (echo '#include <sysdep.h>'; \\
 144          echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
 145          echo ' ret'; \\
 146          echo 'PSEUDO_END($strong)'; \\
 147          echo 'libc_hidden_def ($strong)'; \\"
 148   ;;
 149   esac
 150
 151   # Append any weak aliases or versions defined for this syscall function.
 152
 153   # A shortcoming in the current gas is that it will only allow one
 154   # version-alias per symbol.  So we create new strong aliases as needed.
 155   vcount=""
 156
 157   for name in $weak; do
 158     case $name in
 159       *@@*)
 160         base=`echo $name | sed 's/@@.*//'`
 161         ver=`echo $name | sed 's/.*@@//'`
 162         if test -z "$vcount" ; then
 163           source=$strong
 164           vcount=1
 165         else
 166           source="${strong}_${vcount}"
 167           vcount=`expr $vcount + 1`
 168           echo "         echo 'strong_alias ($strong, $source)'; \\"
 169         fi
 170         echo "   echo 'default_symbol_version($source, $base, $ver)'; \\"
 171         ;;
 172       *@*)
 173         base=`echo $name | sed 's/@.*//'`
 174         ver=`echo $name | sed 's/.*@//'`
 175         if test -z "$vcount" ; then
 176           source=$strong
 177           vcount=1
 178         else
 179           source="${strong}_${vcount}"
 180           vcount=`expr $vcount + 1`
 181           echo "         echo 'strong_alias ($strong, $source)'; \\"
 182         fi
 183         echo "   echo 'symbol_version($source, $base, $ver)'; \\"
 184         ;;
 185       *)
 186         echo "   echo 'weak_alias ($strong, $name)'; \\"
 187         echo "   echo 'libc_hidden_weak ($name)'; \\"
 188         ;;
 189     esac
 190   done
 191
 192   # And finally, pipe this all into the compiler.
 193   echo '        ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
 194
 195   case $weak in
 196   *@*)
 197     # The versioned symbols are only in the shared library.
 198     echo endif
 199     ;;
 200   esac
 201
 202   echo endif
 203  ;;
 204  esac
 205
 206   case x"$callnum",$srcfile,$args in
 207   x[_-],-,* | x*,*.[sS],*V*) ;;
 208   x*,-,*$ptr* | x*,*.[sS],*$ptr*)
 209
 210     nv_weak=`for name in $weak; do
 211                 case $name in
 212                 *@*) ;;
 213                 *) echo $name;;
 214                 esac; done`
 215
 216     # choose the name with the fewest leading underscores, preferably none
 217     set `echo $strong $nv_weak |tr '@ \t' ' \n\n' |sort -r`
 218     callname=$1
 219
 220     # convert signature string to individual numbered arg names
 221     # e.g., i:ipbN -> i0 i1 p2 b3 N4
 222     set `echo $args |
 223         sed -e 's/^\(.\):\(.*\)/\2 <\10>/' \
 224             -e 's/^\([^ ]\)\(.*\)/\2 <\11>/' \
 225             -e 's/^\([^ ]\)\(.*\)/\2 <\12>/' \
 226             -e 's/^\([^ ]\)\(.*\)/\2 <\13>/' \
 227             -e 's/^\([^ ]\)\(.*\)/\2 <\14>/' \
 228             -e 's/^\([^ ]\)\(.*\)/\2 <\15>/' \
 229             -e 's/^\([^ ]\)\(.*\)/\2 <\16>/' \
 230             -e 's/^\([^ ]\)\(.*\)/\2 <\17>/' \
 231             -e 's/^\([^ ]\)\(.*\)/\2 <\18>/' \
 232             -e 's/^\([^ ]\)\(.*\)/\2 <\19>/'`
 233     rtn=$1; shift
 234     args=$*
 235     arglist=`echo $* |sed 's/ /, /g'`
 236
 237     # The best way to understand what's going on here is to examine
 238     # the output in BUILDDIR/sysd-syscalls.
 239
 240     # generate makefile envelope & rule head
 241     echo "ifeq (,\$(filter $file,\$(bp-thunks)))"
 242     echo "bp-thunks += $file"
 243     echo "\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto.d"
 244
 245     # generate macro head
 246     echo "      (echo '#define $callname(`echo $arglist | \
 247             sed -e 's/[<>]//g'`) `echo $rtn | \
 248             sed -e 's/<\('$typ'0\)>/\1v;/g' \
 249                 -e 's/<\(b0\)>/x0; extern char \1v;/g'` \\'; \\"
 250
 251     # generate extern decls of dummy variables for each arg
 252     echo "       echo '`echo $args | \
 253             sed -e 's/<\('$typ'[1-9]\)>/extern \1, \1v;/g' \
 254                 -e 's/<\([abBFIsSV][1-9]\)>/extern char \1v;/g' \
 255                 -e 's/<\([Wv][1-9]\)>/extern int \1v;/g'` \\'; \\"
 256
 257     # generate bounded-pointer thunk declarator
 258     echo "       echo '`echo $rtn | \
 259             sed -e 's/<\('$ptr'0\)>/__typeof (\1v) *__bounded/g' \
 260                 -e 's/<\('$int'0\)>/__typeof (\1v)/g'` BP_SYM ($strong) (`echo $arglist | \
 261             sed -e 's/<\('$ptr'[1-9]\)>/__typeof (\1v) *__bounded \1a/g' \
 262                 -e 's/<\('$int'[1-9]\)>/__typeof (\1v) \1a/g'`) { \\'; \\"
 263
 264     # generate extern primitive syscall declaration
 265     echo "       echo '  extern `echo $rtn | \
 266             sed -e 's/<\('$ptr'0\)>/__typeof (\1v) *__unbounded/g' \
 267                 -e 's/<\('$int'0\)>/__typeof (\1v)/g'` ($callname) (`echo $arglist | \
 268             sed -e 's/<\('$ptr'[1-9]\)>/__typeof (\1v) *__unbounded/g' \
 269                 -e 's/<\('$int'[1-9]\)>/__typeof (\1v)/g'`); \\'; \\"
 270
 271     # generate call the primtive system call, optionally wrapping bounds
 272     # around the result if the signature's return keyletter is `b'.
 273     echo "       echo '  return `echo $rtn |
 274             sed -e 's/<b0>/BOUNDED_N (/' \
 275                 -e 's/<.0>//'`($callname) (`echo $arglist | \
 276             sed -e 's/<\(a[1-9]\)>/__ptrvalue (\1a)/g' \
 277                 -e 's/<\(n[1-9]\)>, <\(V[1-9]\)>/\1a, CHECK_N_PAGES (\2a, \1a)/g' \
 278                 -e 's/<\(b[1-9]\)>, <\(n[1-9]\)>/CHECK_N (\1a, \2a), \2a/g' \
 279                 -e 's/<\(b[1-9]\)>, <\(N[1-9]\)>/CHECK_N (\1a, *CHECK_1 (\2a)), __ptrvalue (\2a)/g' \
 280                 -e 's/<\(B[1-9]\)>, <\(n[1-9]\)>/CHECK_N_NULL_OK (\1a, \2a), \2a/g' \
 281                 -e 's/<\(B[1-9]\)>, <\(N[1-9]\)>/CHECK_N_NULL_OK (\1a, *CHECK_1 (\2a)), __ptrvalue (\2a)/g' \
 282                 -e 's/<\(f[1-9]\)>/CHECK_N (\1a, 2)/g' \
 283                 -e 's/<\(i[1-9]\)>, <\(F[1-9]\)>/\1a, CHECK_FCNTL (\2a, \1a)/g' \
 284                 -e 's/<\(i[1-9]\)>, <\(I[1-9]\)>/\1a, CHECK_IOCTL (\2a, \1a)/g' \
 285                 -e 's/<\(p[1-9]\)>/CHECK_1 (\1a)/g' \
 286                 -e 's/<\([PW][1-9]\)>/CHECK_1_NULL_OK (\1a)/g' \
 287                 -e 's/<\(s[1-9]\)>/CHECK_STRING (\1a)/g' \
 288                 -e 's/<\(S[1-9]\)>/CHECK_STRING_NULL_OK (\1a)/g' \
 289                 -e 's/<\([ivn][1-9]\)>/\1a/g'`)`echo $rtn $args |
 290             sed -e 's/<b0>.*<\(n[1-9]\)>.*/, \1a)/' \
 291                 -e 's/<.0>.*//'`; \\'; \\"
 292
 293     echo "       echo '} \\'; \\"
 294
 295     echo "       echo 'libc_hidden_def (BP_SYM ($strong)) \\'; \\"
 296
 297     # generate thunk aliases
 298     for name in $nv_weak; do
 299       echo "     echo 'weak_alias (BP_SYM ($strong), BP_SYM ($name)) \\'; \\"
 300       echo "     echo 'libc_hidden_weak (BP_SYM ($name)) \\'; \\"
 301     done
 302
 303     # wrap up
 304     echo "\
 305          echo ''; \\
 306          echo '#include <bp-thunks.h>'; \\
 307         ) | \$(COMPILE.c) -x c -o \$@ -"
 308 ### Use this for debugging intermediate output:
 309 ###     ) >\$(@:.ob=.c)
 310 ###     \$(subst -c,-E,\$(COMPILE.c)) -o \$(@:.ob=.ib) \$(@:.ob=.c)
 311 ###     \$(COMPILE.c) -x cpp-output -o \$@ \$(@:.ob=.ib)"
 312     echo endif
 313     ;;
 314   esac
 315
 316 done