f2c9942e97
have no names without leading underscores. 2000-07-07 Greg McGary <greg@mcgary.org> * sysdeps/unix/make-syscalls.sh: Tolerate syscalls that have no names without leading underscores.
294 lines
9 KiB
Bash
294 lines
9 KiB
Bash
#! /bin/sh
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# Usage: make-syscalls.sh ../sysdeps/unix/common
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# Expects $sysdirs in environment.
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##############################################################################
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# Syscall Signature Key Letters for BP Thunks:
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#
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# a: unchecked address (e.g., 1st arg to mmap)
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# b: non-NULL buffer (e.g., 2nd arg to read)
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# B: optionally-NULL buffer (e.g., 4th arg to getsockopt)
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# f: buffer of 2 ints (e.g., 4th arg to socketpair)
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# i: scalar (any signedness & size: int, long, long long, enum, whatever)
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# n: scalar buffer length (e.g., 3rd arg to read)
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# N: pointer to value/return scalar buffer length (e.g., 6th arg to recvfrom)
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# p: pointer to typed object (e.g., any non-void* arg)
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# P: pointer return value (e.g., return value from mmap)
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# s: string (e.g., 1st arg to open)
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# v: vararg scalar (e.g., optional 3rd arg to open)
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# V: vararg pointer (e.g., 3rd arg to fcntl & ioctl)
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ptrlet='[abBfNpPs]'
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argdig='[1-9]'
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fixarg='[^vV]'$argdig # fixed args (declare extern)
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strarg=s$argdig # string arg (check with CHECK_STRING)
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twoarg=f$argdig # fd pair arg (check with CHECK_N (..., 2)
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objarg=p$argdig # object arg (check with CHECK_1)
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ptrarg=$ptrlet$argdig # pointer arg (toss bounds)
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rtnarg='P'$argdig # pointer return value (add bounds)
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bufarg='[bB]'$argdig # buffer arg (check with CHECK_N)
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intarg='[inv]'$argdig # scalar arg
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borarg='[iv]'$argdig # boring arg (just pass it through)
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##############################################################################
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thisdir=$1; shift
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echo ''
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echo \#### DIRECTORY = $thisdir
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# Check each sysdep dir with higher priority than this one,
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# and remove from $calls all the functions found in other dirs.
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# Punt when we reach the directory defining these syscalls.
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sysdirs=`for dir in $sysdirs; do
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test $dir = $thisdir && break; echo $dir; done`
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echo \#### SYSDIRS = $sysdirs
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# Get the list of system calls for this directory.
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calls=`sed 's/#.*$//
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/^[ ]*$/d' $thisdir/syscalls.list`
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calls=`echo "$calls" |
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while read file caller rest; do
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# Remove each syscall that is implemented by a file in $dir.
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# If a syscall specified a "caller", then only compile that syscall
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# if the caller function is also implemented in this directory.
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srcfile=-;
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for dir in $sysdirs; do
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{ test -f $dir/$file.c && srcfile=$dir/$file.c; } ||
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{ test -f $dir/$file.S && srcfile=$dir/$file.S; } ||
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{ test -f $dir/$file.s && srcfile=$dir/$file.s; } ||
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{ test x$caller != x- &&
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{ { test -f $dir/$caller.c && srcfile=$dir/$caller.c; } ||
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{ test -f $dir/$caller.S && srcfile=$dir/$caller.S; } ||
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{ test -f $dir/$caller.s && srcfile=$dir/$caller.s; }; }; } && break;
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done;
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echo $file $srcfile $caller $rest;
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done`
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# Any calls left?
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test -n "$calls" || exit 0
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# Emit rules to compile the syscalls remaining in $calls.
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echo "$calls" |
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while read file srcfile caller syscall args strong weak; do
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# Figure out if $syscall is defined with a number in syscall.h.
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callnum=-
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eval `{ echo "#include <sysdep.h>";
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echo "callnum=SYS_ify ($syscall)"; } |
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$asm_CPP - |sed -n -e "/^callnum=.*$syscall/d" \
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-e "/^\(callnum=\)[ ]*\(.*\)/s//\1'\2'/p"`
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# Derive the number of arguments from the argument signature
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case $args in
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[0-9]) nargs=$args;;
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?:) nargs=0;;
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?:?) nargs=1;;
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?:??) nargs=2;;
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?:???) nargs=3;;
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?:????) nargs=4;;
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?:?????) nargs=5;;
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?:??????) nargs=6;;
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?:???????) nargs=7;;
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?:????????) nargs=8;;
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?:?????????) nargs=9;;
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esac
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# Make sure only the first syscall rule is used, if multiple dirs
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# define the same syscall.
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echo ''
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echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
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case x$srcfile"$callnum" in
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x*-) ;; ### Do nothing for undefined callnum
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x-*)
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echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
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case $weak in
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*@*)
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# The versioned symbols are only in the shared library.
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echo "ifneq (,\$(filter .os,\$(object-suffixes)))"
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;;
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esac
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# Accumulate the list of syscall files for this directory.
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echo "unix-syscalls += $file"
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test x$caller = x- || echo "unix-extra-syscalls += $file"
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# Emit a compilation rule for this syscall.
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case $weak in
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*@*)
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# The versioned symbols are only in the shared library.
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echo "\
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shared-only-routines += $file
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\$(objpfx)${file}.os: \\"
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;;
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*)
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echo "\
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\$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o): \\"
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;;
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esac
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echo " \$(common-objpfx)s-proto.d
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(echo '#include <sysdep.h>'; \\
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echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
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echo ' ret'; \\
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echo 'PSEUDO_END($strong)'; \\"
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# Append any weak aliases or versions defined for this syscall function.
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# A shortcoming in the current gas is that it will only allow one
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# version-alias per symbol. So we create new strong aliases as needed.
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vcount=""
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for name in $weak; do
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case $name in
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*@@*)
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base=`echo $name | sed 's/@@.*//'`
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ver=`echo $name | sed 's/.*@@//'`
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if test -z "$vcount" ; then
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source=$strong
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vcount=1
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else
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source="${strong}_${vcount}"
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vcount=`expr $vcount + 1`
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echo " echo 'strong_alias ($strong, $source)'; \\"
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fi
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echo " echo 'default_symbol_version($source, $base, $ver)'; \\"
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;;
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*@*)
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base=`echo $name | sed 's/@.*//'`
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ver=`echo $name | sed 's/.*@//'`
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if test -z "$vcount" ; then
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source=$strong
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vcount=1
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else
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source="${strong}_${vcount}"
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vcount=`expr $vcount + 1`
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echo " echo 'strong_alias ($strong, $source)'; \\"
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fi
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echo " echo 'symbol_version($source, $base, $ver)'; \\"
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;;
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*)
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echo " echo 'weak_alias ($strong, $name)'; \\"
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;;
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esac
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done
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# And finally, pipe this all into the compiler.
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echo ' ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
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case $weak in
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*@*)
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# The versioned symbols are only in the shared library.
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echo endif
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;;
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esac
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echo endif
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;;
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esac
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case x"$callnum",$srcfile,$args in
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x-,-,* | x*,*.[sS],*V*) ;;
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x*,-,*$ptrlet* | x*,*.[sS],*$ptrlet*)
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# choose the name with the fewest leading underscores, preferably none
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set `echo $strong $weak |tr ' \t' '\n' |sort -r`
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callname=$1
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# convert signature string to individual numbered arg names
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# e.g., i:ipbN -> i0 i1 p2 b3 N4
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set `echo $args |
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sed -e 's/^\(.\):\(.*\)/\2 \10/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \11/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \12/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \13/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \14/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \15/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \16/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \17/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \18/' \
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-e 's/^\([^ ]\)\(.*\)/\2 \19/'`
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rtn=$1; shift
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args=$*
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arglist=`echo $* |sed 's/ /, /g'`
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# The best way to understand what's going on here is to examine
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# the output in BUILDDIR/sysd-syscalls.
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# generate makefile envelope & rule head
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echo "ifeq (,\$(filter $file,\$(bp-thunks)))"
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echo "bp-thunks += $file"
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echo "\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto.d"
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# generate macro head & thunk prologue
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echo "\
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(echo '#define $callname($arglist) r0, $rtn; \\'; \\
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echo '`echo $args | \
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sed -e 's/\('$fixarg'\)/extern \1, \1v;/g' \
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-e 's/\(v'$argdig'\)/extern int \1v;/g'` \\'; \\
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echo '__typeof (r0) BP_SYM ($strong) (`echo $args | \
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sed -e 's/ /, /g' \
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-e 's/\('$ptrarg'\)/__typeof (\1v) *__bounded \1a/g' \
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-e 's/\('$intarg'\)/__typeof (\1v) \1a/g'`) { \\'; \\
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echo ' extern __typeof (r0) ($callname) (`echo $args | \
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sed -e 's/ /, /g' \
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-e 's/\('$ptrarg'\)/__typeof (\1v) *__unbounded/g' \
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-e 's/\('$intarg'\)/__typeof (\1v)/g'`); \\'; \\"
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# generate thunk bounds checks
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for arg; do
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next=$2; shift
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case $arg in
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B$argdig) echo " echo ' __ptrvalue (${arg}a) && \\'; \\" ;;
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esac
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case $arg in
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n$argdig) len=$arg ;; ### save for possible use with return value.
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$strarg) echo " echo ' CHECK_STRING (${arg}a); \\'; \\" ;;
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$objarg) echo " echo ' CHECK_1 (${arg}a); \\'; \\" ;;
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$twoarg) echo " echo ' CHECK_N (${arg}a, 2); \\'; \\" ;;
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$bufarg)
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case $next in
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n$argdig) echo " echo ' CHECK_N (${arg}a, ${next}a); \\'; \\" ;;
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N$argdig) echo " echo ' CHECK_N (${arg}a, *CHECK_1 (${next}a)); \\'; \\" ;;
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*) echo "### BP Thunk Error: Expected length after buffer ###" ;;
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esac ;;
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esac
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done
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# generate thunk epilogue
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funcall="($callname) (`echo $args | \
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sed -e 's/ /, /g' \
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-e 's/\('$ptrarg'\)/__ptrvalue (\1a)/g' \
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-e 's/\('$intarg'\)/\1a/g'`)"
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case $rtn in
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P*) echo " echo '{ __typeof ($rtn) *__bounded rtn; \\'; \\
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echo ' __ptrlow (rtn) = __ptrvalue (rtn) = $funcall; \\'; \\
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echo ' __ptrhigh (rtn) = __ptrlow (rtn) + ${len}a; return rtn; } \\'; \\" ;;
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*) echo " echo ' return $funcall; \\'; \\" ;;
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esac
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echo " echo '} \\'; \\"
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# generate thunk aliases
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for name in $weak; do
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case $name in
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*@*) ;;
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*) echo " echo 'weak_alias (BP_SYM ($strong), BP_SYM ($name)) \\'; \\" ;;
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esac
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done
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# wrap up
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echo "\
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echo ''; \\
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echo '#include <bp-thunks.h>'; \\
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) | \$(COMPILE.c) -x c -o \$@ -"
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### Use this for debugging intermediate output:
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### echo ' ) >$(@:.ob=.c)
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### $(subst -c,-E,$(COMPILE.c)) -o $(@:.ob=.ib) $(@:.ob=.c)
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### $(COMPILE.c) -x cpp-output -o $@ $(@:.ob=.ib)'
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echo endif
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;;
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esac
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done
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