about summary refs log tree commit diff
path: root/sysdeps/unix/make-syscalls.sh
blob: 89bd3a3e42e02a826a6d1188eed851678be4f422 (plain) (blame)
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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
#! /bin/sh

# Usage: make-syscalls.sh ../sysdeps/unix/common
# Expects $sysdirs in environment.

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)"; } |
	  $asm_CPP - |sed -n -e "/^callnum=.*$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;;
  esac

  # 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"
 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*,-,*[sp]* | x*,*.[sS],*[sp]*)
    echo "ifeq (,\$(filter $file,\$(bp-thunks)))"
    echo "bp-thunks += $file";
    echo "\
\$(objpfx)\$(bppfx)$file.ob: \$(common-objpfx)s-proto.d
	(echo '#include <bp-thunks.h>'; \\
	 echo 'BP_THUNK_`echo $args |tr : _` ($strong)'; \\"

    for name in $weak; do
      case $name in
	*@*) ;;
	*) echo "	 echo 'BP_ALIAS ($strong, $name)'; \\" ;;
      esac
    done

    echo '	) | $(COMPILE.c) -x c -o $@ -'
    echo endif
    ;;
  esac

done