1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
#! /bin/sh
# Usage: make-syscalls.sh ../sysdeps/unix/common
# Expects $sysdirs in environment.
thisdir=$1; shift
# Get the list of system calls for this directory.
calls=`sed 's/#.*$//
/^[ ]*$/d' $thisdir/syscalls.list`
# Check each sysdep dir with higher priority than this one,
# and remove from $calls all the functions found in other dirs.
for dir in $sysdirs; do
# Punt when we reach the directory defining these syscalls.
test $dir = $thisdir && break
# Remove each syscall that is implemented by a file in $dir.
# If a syscall specified a "caller", then only compile that syscall
# if the caller function is also implemented in this directory.
calls=`echo "$calls" | while read file caller rest; do
test -f $dir/$file.c && continue
test -f $dir/$file.S && continue
test -f $dir/$file.s && continue
if test x$caller != x-; then
test -f $dir/$caller.c && continue
test -f $dir/$caller.S && continue
test -f $dir/$caller.s && continue
fi
echo $file $caller $rest
done`
done
# Any calls left?
test -n "$calls" || exit 0
files=
# Emit rules to compile the syscalls remaining in $calls.
echo "$calls" | while read file caller syscall nargs strong weak; do
# Figure out if $syscall is defined with a number in syscall.h.
$asm_CPP - << EOF | grep "^@@@ .*$syscall" >/dev/null && continue
#include <sysdep.h>
@@@ SYS_ify ($syscall)
EOF
# Make sure only the first syscall rule is used, if multiple dirs
# define the same syscall.
echo "ifeq (,\$(filter $file,\$(unix-syscalls)))"
# Accumulate the list of syscall files for this directory.
echo "unix-syscalls += $file"
test x$caller = x- || echo "unix-extra-syscalls += $file"
# Emit a compilation rule for this syscall.
echo "\
\$(foreach o,\$(object-suffixes),\$(objpfx)$file\$o): \\
\$(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 $@ -'
echo endif
done
|
