mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
297 lines
9.6 KiB
Bash
297 lines
9.6 KiB
Bash
#! /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
|
|
|
|
# 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"`
|
|
|
|
# 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*-) ;; ### 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)$file\$o): \\"
|
|
;;
|
|
esac
|
|
echo " \$(common-objpfx)s-proto.d
|
|
(echo '#include <sysdep.h>'; \\
|
|
echo 'PSEUDO ($strong, $syscall, $nargs)'; \\
|
|
echo ' ret'; \\
|
|
echo 'PSEUDO_END($strong)'; \\"
|
|
|
|
# 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)'; \\"
|
|
;;
|
|
esac
|
|
done
|
|
|
|
# And finally, pipe this all into the compiler.
|
|
echo ' ) | $(COMPILE.S) -x assembler-with-cpp -o $@ -'
|
|
|
|
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.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 '} \\'; \\"
|
|
|
|
# generate thunk aliases
|
|
for name in $nv_weak; do
|
|
echo " echo 'weak_alias (BP_SYM ($strong), 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
|