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glibc/sysdeps/unix/make-syscalls.sh

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#! /bin/sh
# Usage: make-syscalls.sh ../sysdeps/unix/common
# Expects $sysdirs in environment.
##############################################################################
# Syscall Signature Key Letters for BP Thunks:
#
# a: unchecked address (e.g., 1st arg to mmap)
# b: non-NULL buffer (e.g., 2nd arg to read; return value from mmap)
# B: optionally-NULL buffer (e.g., 4th arg to getsockopt)
# f: buffer of 2 ints (e.g., 4th arg to socketpair)
# F: 3rd arg to fcntl
# i: scalar (any signedness & size: int, long, long long, enum, whatever)
# I: 3rd arg to ioctl
# n: scalar buffer length (e.g., 3rd arg to read)
# N: pointer to value/return scalar buffer length (e.g., 6th arg to recvfrom)
# p: non-NULL pointer to typed object (e.g., any non-void* arg)
# P: optionally-NULL pointer to typed object (e.g., 2nd argument to gettimeofday)
# s: non-NULL string (e.g., 1st arg to open)
# S: optionally-NULL string (e.g., 1st arg to acct)
# v: vararg scalar (e.g., optional 3rd arg to open)
# V: byte-per-page vector (3rd arg to mincore)
# W: wait status, optionally-NULL pointer to int (e.g., 2nd arg of wait4)
ptr='[abBfFINpPsSWV]' # all pointer keyletters
int='[inv]' # all scalar keyletters
typ='[ifnNpP]' # typed-arg keyletters: we capture type for use in thunk
##############################################################################
thisdir=$1; shift
echo ''
echo \#### DIRECTORY = $thisdir
# Check each sysdep dir with higher priority than this one,
# and remove from $calls all the functions found in other dirs.
# Punt when we reach the directory defining these syscalls.
sysdirs=`for dir in $sysdirs; do
test $dir = $thisdir && break; echo $dir; done`
echo \#### SYSDIRS = $sysdirs
# Get the list of system calls for this directory.
calls=`sed 's/#.*$//
/^[ ]*$/d' $thisdir/syscalls.list`
calls=`echo "$calls" |
while read file caller rest; do
# Remove each syscall that is implemented by a file in $dir.
# If a syscall specified a "caller", then only compile that syscall
# if the caller function is also implemented in this directory.
srcfile=-;
for dir in $sysdirs; do
{ test -f $dir/$file.c && srcfile=$dir/$file.c; } ||
{ test -f $dir/$file.S && srcfile=$dir/$file.S; } ||
{ test -f $dir/$file.s && srcfile=$dir/$file.s; } ||
{ test x$caller != x- &&
{ { test -f $dir/$caller.c && srcfile=$dir/$caller.c; } ||
{ test -f $dir/$caller.S && srcfile=$dir/$caller.S; } ||
{ test -f $dir/$caller.s && srcfile=$dir/$caller.s; }; }; } && break;
done;
echo $file $srcfile $caller $rest;
done`
# Any calls left?
test -n "$calls" || exit 0
# Emit rules to compile the syscalls remaining in $calls.
echo "$calls" |
while read file srcfile caller syscall args strong weak; do
case x"$syscall" in
x-) callnum=_ ;;
*)
# Figure out if $syscall is defined with a number in syscall.h.
callnum=-
eval `{ echo "#include <sysdep.h>";
echo "callnum=SYS_ify ($syscall)"; } |
$asm_CPP -D__OPTIMIZE__ - |
sed -n -e "/^callnum=.*$syscall/d" \
-e "/^\(callnum=\)[ ]*\(.*\)/s//\1'\2'/p"`
;;
esac
cancellable=
noerrno=
case $args in
C*) cancellable=-cancel; args=`echo $args | sed 's/C:\?//'`;;
E*) noerrno=_NOERRNO; args=`echo $args | sed 's/E:\?//'`;;
esac
# Derive the number of arguments from the argument signature
case $args in
[0-9]) nargs=$args;;
?:) nargs=0;;
?:?) nargs=1;;
?:??) nargs=2;;
?:???) nargs=3;;
?:????) nargs=4;;
?:?????) nargs=5;;
?:??????) nargs=6;;
?:???????) nargs=7;;
?:????????) nargs=8;;
?:?????????) nargs=9;;
esac
# Make sure only the first syscall rule is used, if multiple dirs
# define the same syscall.
echo ''
echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
case x$srcfile"$callnum" in
x--)
# Undefined callnum for an extra syscall.
if [ x$caller != x- ]; then
if [ x$noerrno != x ]; then
echo >&2 "$0: no number for $fileno, no-error syscall ($strong $weak)"
exit 2
fi
echo "unix-stub-syscalls += $strong $weak"
fi
;;
x*-) ;; ### Do nothing for undefined callnum
x-*)
echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
case $weak in
*@*)
# The versioned symbols are only in the shared library.
echo "ifneq (,\$(filter .os,\$(object-suffixes)))"
;;
esac
# Accumulate the list of syscall files for this directory.
echo "unix-syscalls += $file"
test x$caller = x- || echo "unix-extra-syscalls += $file"
# Emit a compilation rule for this syscall.
case $weak in
*@*)
# The versioned symbols are only in the shared library.
echo "\
shared-only-routines += $file
\$(objpfx)${file}.os: \\"
;;
*)
echo "\
\$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o) \
\$(foreach o,\$(object-suffixes),\$(objpfx)ptw-$file\$o) \
\$(objpfx)rtld-$file.os: \\"
;;
esac
echo " \$(common-objpfx)s-proto$cancellable.d"
case x"$callnum" in
x_)
echo "\
(echo '/* Dummy module requested by syscalls.list */'; \\"
;;
x*)
echo "\
\$(make-target-directory)
(echo '#include <sysdep$cancellable.h>'; \\
echo 'PSEUDO$noerrno ($strong, $syscall, $nargs)'; \\
echo ' ret$noerrno'; \\
echo 'PSEUDO_END$noerrno($strong)'; \\
echo 'libc_hidden_def ($strong)'; \\"
;;
esac
# Append any weak aliases or versions defined for this syscall function.
# A shortcoming in the current gas is that it will only allow one
# version-alias per symbol. So we create new strong aliases as needed.
vcount=""
for name in $weak; do
case $name in
*@@*)
base=`echo $name | sed 's/@@.*//'`
ver=`echo $name | sed 's/.*@@//'`
if test -z "$vcount" ; then
source=$strong
vcount=1
else
source="${strong}_${vcount}"
vcount=`expr $vcount + 1`
echo " echo 'strong_alias ($strong, $source)'; \\"
fi
echo " echo 'default_symbol_version($source, $base, $ver)'; \\"
;;
*@*)
base=`echo $name | sed 's/@.*//'`
ver=`echo $name | sed 's/.*@//'`
if test -z "$vcount" ; then
source=$strong
vcount=1
else
source="${strong}_${vcount}"
vcount=`expr $vcount + 1`
echo " echo 'strong_alias ($strong, $source)'; \\"
fi
echo " echo 'symbol_version($source, $base, $ver)'; \\"
;;
*)
echo " echo 'weak_alias ($strong, $name)'; \\"
echo " echo 'libc_hidden_weak ($name)'; \\"
;;
esac
done
# And finally, pipe this all into the compiler.
echo ' ) | $(compile-syscall)'
case $weak in
*@*)
# The versioned symbols are only in the shared library.
echo endif
;;
esac
echo endif
;;
esac
case x"$callnum",$srcfile,$args in
x[_-],-,* | x*,*.[sS],*V*) ;;
x*,-,*$ptr* | x*,*.[sS],*$ptr*)
nv_weak=`for name in $weak; do
case $name in
*@*) ;;
*) echo $name;;
esac; done`
# choose the name with the fewest leading underscores, preferably none
set `echo $strong $nv_weak |tr '@ \t' ' \n\n' |sort -r`
callname=$1
# convert signature string to individual numbered arg names
# e.g., i:ipbN -> i0 i1 p2 b3 N4
set `echo $args |
sed -e 's/^\(.\):\(.*\)/\2 <\10>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\11>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\12>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\13>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\14>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\15>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\16>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\17>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\18>/' \
-e 's/^\([^ ]\)\(.*\)/\2 <\19>/'`
rtn=$1; shift
args=$*
arglist=`echo $* |sed 's/ /, /g'`
# The best way to understand what's going on here is to examine
# the output in BUILDDIR/sysd-syscalls.
# generate makefile envelope & rule head
echo "ifeq (,\$(filter $file,\$(bp-thunks)))"
echo "bp-thunks += $file"
echo "\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto-bp.d"
# generate macro head
echo " (echo '#define $callname(`echo $arglist | \
sed -e 's/[<>]//g'`) `echo $rtn | \
sed -e 's/<\('$typ'0\)>/\1v;/g' \
-e 's/<\(b0\)>/x0; extern char \1v;/g'` \\'; \\"
# generate extern decls of dummy variables for each arg
echo " echo '`echo $args | \
sed -e 's/<\('$typ'[1-9]\)>/extern \1, \1v;/g' \
-e 's/<\([abBFIsSV][1-9]\)>/extern char \1v;/g' \
-e 's/<\([Wv][1-9]\)>/extern int \1v;/g'` \\'; \\"
# generate bounded-pointer thunk declarator
echo " echo '`echo $rtn | \
sed -e 's/<\('$ptr'0\)>/__typeof (\1v) *__bounded/g' \
-e 's/<\('$int'0\)>/__typeof (\1v)/g'` BP_SYM ($strong) (`echo $arglist | \
sed -e 's/<\('$ptr'[1-9]\)>/__typeof (\1v) *__bounded \1a/g' \
-e 's/<\('$int'[1-9]\)>/__typeof (\1v) \1a/g'`) { \\'; \\"
# generate extern primitive syscall declaration
echo " echo ' extern `echo $rtn | \
sed -e 's/<\('$ptr'0\)>/__typeof (\1v) *__unbounded/g' \
-e 's/<\('$int'0\)>/__typeof (\1v)/g'` ($callname) (`echo $arglist | \
sed -e 's/<\('$ptr'[1-9]\)>/__typeof (\1v) *__unbounded/g' \
-e 's/<\('$int'[1-9]\)>/__typeof (\1v)/g'`); \\'; \\"
# generate call the primtive system call, optionally wrapping bounds
# around the result if the signature's return keyletter is `b'.
echo " echo ' return `echo $rtn |
sed -e 's/<b0>/BOUNDED_N (/' \
-e 's/<.0>//'`($callname) (`echo $arglist | \
sed -e 's/<\(a[1-9]\)>/__ptrvalue (\1a)/g' \
-e 's/<\(n[1-9]\)>, <\(V[1-9]\)>/\1a, CHECK_N_PAGES (\2a, \1a)/g' \
-e 's/<\(b[1-9]\)>, <\(n[1-9]\)>/CHECK_N (\1a, \2a), \2a/g' \
-e 's/<\(b[1-9]\)>, <\(N[1-9]\)>/CHECK_N (\1a, *CHECK_1 (\2a)), __ptrvalue (\2a)/g' \
-e 's/<\(B[1-9]\)>, <\(n[1-9]\)>/CHECK_N_NULL_OK (\1a, \2a), \2a/g' \
-e 's/<\(B[1-9]\)>, <\(N[1-9]\)>/CHECK_N_NULL_OK (\1a, *CHECK_1 (\2a)), __ptrvalue (\2a)/g' \
-e 's/<\(f[1-9]\)>/CHECK_N (\1a, 2)/g' \
-e 's/<\(i[1-9]\)>, <\(F[1-9]\)>/\1a, CHECK_FCNTL (\2a, \1a)/g' \
-e 's/<\(i[1-9]\)>, <\(I[1-9]\)>/\1a, CHECK_IOCTL (\2a, \1a)/g' \
-e 's/<\(p[1-9]\)>/CHECK_1 (\1a)/g' \
-e 's/<\([PW][1-9]\)>/CHECK_1_NULL_OK (\1a)/g' \
-e 's/<\(s[1-9]\)>/CHECK_STRING (\1a)/g' \
-e 's/<\(S[1-9]\)>/CHECK_STRING_NULL_OK (\1a)/g' \
-e 's/<\([ivn][1-9]\)>/\1a/g'`)`echo $rtn $args |
sed -e 's/<b0>.*<\(n[1-9]\)>.*/, \1a)/' \
-e 's/<.0>.*//'`; \\'; \\"
echo " echo '} \\'; \\"
echo " echo 'libc_hidden_def (BP_SYM ($strong)) \\'; \\"
# generate thunk aliases
for name in $nv_weak; do
echo " echo 'weak_alias (BP_SYM ($strong), BP_SYM ($name)) \\'; \\"
echo " echo 'libc_hidden_weak (BP_SYM ($name)) \\'; \\"
done
# wrap up
echo "\
echo ''; \\
echo '#include <bp-thunks.h>'; \\
) | \$(COMPILE.c) -x c -o \$@ -"
### Use this for debugging intermediate output:
### ) >\$(@:.ob=.c)
### \$(subst -c,-E,\$(COMPILE.c)) -o \$(@:.ob=.ib) \$(@:.ob=.c)
### \$(COMPILE.c) -x cpp-output -o \$@ \$(@:.ob=.ib)"
echo endif
;;
esac
done
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