137 lines
3.5 KiB
Bash
137 lines
3.5 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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thisdir=$1; shift
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# Get the list of system calls for this directory.
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calls=`sed 's/#.*$//
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/^[ ]*$/d' $thisdir/syscalls.list`
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# 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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for dir in $sysdirs; do
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# Punt when we reach the directory defining these syscalls.
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test $dir = $thisdir && break
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# Remove each syscall that is implemented by a file in $dir.
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# If a syscall specified a "caller", then only compile that syscall
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# if the caller function is also implemented in this directory.
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calls=`echo "$calls" | while read file caller rest; do
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test -f $dir/$file.c && continue
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test -f $dir/$file.S && continue
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test -f $dir/$file.s && continue
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if test x$caller != x-; then
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test -f $dir/$caller.c && continue
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test -f $dir/$caller.S && continue
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test -f $dir/$caller.s && continue
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fi
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echo $file $caller $rest
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done`
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done
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# Any calls left?
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test -n "$calls" || exit 0
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files=
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# Emit rules to compile the syscalls remaining in $calls.
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echo "$calls" | while read file caller syscall nargs strong weak; do
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# Figure out if $syscall is defined with a number in syscall.h.
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$asm_CPP - << EOF | grep "^@@@ .*$syscall" >/dev/null && continue
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#include <sysdep.h>
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@@@ SYS_ify ($syscall)
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EOF
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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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# 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 "ifeq (,\$(filter $file,\$(unix-syscalls)))"
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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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echo endif
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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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done
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