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authorGreg McGary <greg@mcgary.org>2000-07-06 00:48:39 +0000
committerGreg McGary <greg@mcgary.org>2000-07-06 00:48:39 +0000
commit34173b51e7b16366953c6f34f6b6cc0012d63fa4 (patch)
treeb3759f8f6afe37602589befbf3cd6ea6ab1630c9 /sysdeps/unix/make-syscalls.sh
parent77432371acbde32fad2c0ee200c94da21dbaf70d (diff)
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* sysdeps/generic/bp-checks.h: New file.
* sysdeps/generic/bp-thunks.h: Replace generic thunk definitions with list of #include files. * sysdeps/unix/make-syscalls.sh: Handle new arg signature keyletters a, b, B, f, n, N, P, v, V. Fixup some indentation. Don't generate BP thunk if `V' appears in signature. Generate thunks with complete bounds checks. * sysdeps/unix/syscalls.list: Refine signatures using new keyletters. * sysdeps/unix/inet/syscalls.list: Likewise. * sysdeps/unix/mman/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/powerpc/syscalls.list: Likewise. 2000-07-05 Greg McGary <greg@mcgary.org> * sysdeps/generic/bp-checks.h: New file. * sysdeps/generic/bp-thunks.h: Replace generic thunk definitions with list of #include files. * sysdeps/unix/make-syscalls.sh: Handle new arg signature keyletters a, b, B, f, n, N, P, v, V. Fixup some indentation. Don't generate BP thunk if `V' appears in signature. Generate thunks with complete bounds checks. * sysdeps/unix/syscalls.list: Refine signatures using new keyletters. * sysdeps/unix/inet/syscalls.list: Likewise. * sysdeps/unix/mman/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/mips/syscalls.list: Likewise. * sysdeps/unix/sysv/linux/powerpc/syscalls.list: Likewise.
Diffstat (limited to 'sysdeps/unix/make-syscalls.sh')
-rw-r--r--sysdeps/unix/make-syscalls.sh141
1 files changed, 127 insertions, 14 deletions
diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh
index 9b05da9cc7..0bedf7a432 100644
--- a/sysdeps/unix/make-syscalls.sh
+++ b/sysdeps/unix/make-syscalls.sh
@@ -3,6 +3,37 @@
# Usage: make-syscalls.sh ../sysdeps/unix/common
# Expects $sysdirs in environment.
+##############################################################################
+
+# Syscall Signature Key Letters for BP Thunks:
+#
+# a: unchecked address (e.g., 1st arg to mmap)
+# b: non-NULL buffer (e.g., 2nd arg to read)
+# B: optionally-NULL buffer (e.g., 4th arg to getsockopt)
+# f: buffer of 2 ints (e.g., 4th arg to socketpair)
+# i: scalar (any signedness & size: int, long, long long, enum, whatever)
+# n: scalar buffer length (e.g., 3rd arg to read)
+# N: pointer to value/return scalar buffer length (e.g., 6th arg to recvfrom)
+# p: pointer to typed object (e.g., any non-void* arg)
+# P: pointer return value (e.g., return value from mmap)
+# s: string (e.g., 1st arg to open)
+# v: vararg scalar (e.g., optional 3rd arg to open)
+# V: vararg pointer (e.g., 3rd arg to fcntl & ioctl)
+
+ptrlet='[abBfNpPs]'
+argdig='[1-9]'
+fixarg='[^vV]'$argdig # fixed args (declare extern)
+strarg=s$argdig # string arg (check with CHECK_STRING)
+twoarg=f$argdig # fd pair arg (check with CHECK_N (..., 2)
+objarg=p$argdig # object arg (check with CHECK_1)
+ptrarg=$ptrlet$argdig # pointer arg (toss bounds)
+rtnarg='P'$argdig # pointer return value (add bounds)
+bufarg='[bB]'$argdig # buffer arg (check with CHECK_N)
+intarg='[inv]'$argdig # scalar arg
+borarg='[iv]'$argdig # boring arg (just pass it through)
+
+##############################################################################
+
thisdir=$1; shift
echo ''
@@ -40,11 +71,12 @@ done`
test -n "$calls" || exit 0
# Emit rules to compile the syscalls remaining in $calls.
-echo "$calls" | while read file srcfile caller syscall args strong weak; do
+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>";
+ # Figure out if $syscall is defined with a number in syscall.h.
+ callnum=-
+ eval `{ echo "#include <sysdep.h>";
echo "callnum=SYS_ify ($syscall)"; } |
$asm_CPP - |sed -n -e "/^callnum=.*$syscall/d" \
-e "/^\(callnum=\)[ ]*\(.*\)/s//\1'\2'/p"`
@@ -66,7 +98,9 @@ eval `{ echo "#include <sysdep.h>";
# Make sure only the first syscall rule is used, if multiple dirs
# define the same syscall.
- echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
+ echo ''
+ echo "#### CALL=$file NUMBER=$callnum ARGS=$args SOURCE=$srcfile"
+
case x$srcfile"$callnum" in
x*-) ;; ### Do nothing for undefined callnum
x-*)
@@ -156,23 +190,102 @@ shared-only-routines += $file
esac
case x"$callnum",$srcfile,$args in
- x-,-,*) ;;
- x*,-,*[sp]* | x*,*.[sS],*[sp]*)
+ x-,-,* | x*,*.[sS],*V*) ;;
+ x*,-,*$ptrlet* | x*,*.[sS],*$ptrlet*)
+
+ # find the name without leading underscores
+ set `echo $strong $weak |tr -s ' \t' '\12' |sed '/^_/d'`
+ 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 "bp-thunks += $file"
+ echo "\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto.d"
+
+ # generate macro head & thunk prologue
echo "\
-\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto.d
- (echo '#include <bp-thunks.h>'; \\
- echo 'BP_THUNK_`echo $args |tr : _` ($strong)'; \\"
+ (echo '#define $callname($arglist) r0, $rtn; \\'; \\
+ echo '`echo $args | \
+ sed -e 's/\('$fixarg'\)/extern \1, \1v;/g' \
+ -e 's/\(v'$argdig'\)/extern int \1v;/g'` \\'; \\
+ echo '__typeof (r0) BP_SYM ($strong) (`echo $args | \
+ sed -e 's/ /, /g' \
+ -e 's/\('$ptrarg'\)/__typeof (\1v) *__bounded \1a/g' \
+ -e 's/\('$intarg'\)/__typeof (\1v) \1a/g'`) { \\'; \\
+ echo ' extern __typeof (r0) ($callname) (`echo $args | \
+ sed -e 's/ /, /g' \
+ -e 's/\('$ptrarg'\)/__typeof (\1v) *__unbounded/g' \
+ -e 's/\('$intarg'\)/__typeof (\1v)/g'`); \\'; \\"
+
+ # generate thunk bounds checks
+ for arg; do
+ next=$2; shift
+ case $arg in
+ B$argdig) echo " echo ' __ptrvalue (${arg}a) && \\'; \\" ;;
+ esac
+ case $arg in
+ n$argdig) len=$arg ;; ### save for possible use with return value.
+ $strarg) echo " echo ' CHECK_STRING (${arg}a); \\'; \\" ;;
+ $objarg) echo " echo ' CHECK_1 (${arg}a); \\'; \\" ;;
+ $twoarg) echo " echo ' CHECK_N (${arg}a, 2); \\'; \\" ;;
+ $bufarg)
+ case $next in
+ n$argdig) echo " echo ' CHECK_N (${arg}a, ${next}a); \\'; \\" ;;
+ N$argdig) echo " echo ' CHECK_N (${arg}a, *CHECK_1 (${next}a)); \\'; \\" ;;
+ *) echo "### BP Thunk Error: Expected length after buffer ###" ;;
+ esac ;;
+ esac
+ done
+ # generate thunk epilogue
+ funcall="($callname) (`echo $args | \
+ sed -e 's/ /, /g' \
+ -e 's/\('$ptrarg'\)/__ptrvalue (\1a)/g' \
+ -e 's/\('$intarg'\)/\1a/g'`)"
+ case $rtn in
+ P*) echo " echo '{ __typeof ($rtn) *__bounded rtn; \\'; \\
+ echo ' __ptrlow (rtn) = __ptrvalue (rtn) = $funcall; \\'; \\
+ echo ' __ptrhigh (rtn) = __ptrlow (rtn) + ${len}a; return rtn; } \\'; \\" ;;
+ *) echo " echo ' return $funcall; \\'; \\" ;;
+ esac
+ echo " echo '} \\'; \\"
+
+ # generate thunk aliases
for name in $weak; do
case $name in
*@*) ;;
- *) echo " echo 'BP_ALIAS ($strong, $name)'; \\" ;;
+ *) echo " echo 'weak_alias (BP_SYM ($strong), BP_SYM ($name)) \\'; \\" ;;
esac
done
-
- echo ' ) | $(COMPILE.c) -x c -o $@ -'
+ # wrap up
+ echo "\
+ echo ''; \\
+ echo '#include <bp-thunks.h>'; \\
+ ) | \$(COMPILE.c) -x c -o \$@ -"
+### Use this for debugging intermediate output:
+### echo ' ) >$(@:.ob=.c)
+### $(subst -c,-E,$(COMPILE.c)) -o $(@:.ob=.ib) $(@:.ob=.c)
+### $(COMPILE.c) -x cpp-output -o $@ $(@:.ob=.ib)'
echo endif
;;
esac