Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/scripts/namespace.pl
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 13375 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #!/usr/bin/perl -w |
2 | # |
3 | # namespace.pl. Mon Aug 30 2004 |
4 | # |
5 | # Perform a name space analysis on the linux kernel. |
6 | # |
7 | # Copyright Keith Owens <kaos@ocs.com.au>. GPL. |
8 | # |
9 | # Invoke by changing directory to the top of the kernel object |
10 | # tree then namespace.pl, no parameters. |
11 | # |
12 | # Tuned for 2.1.x kernels with the new module handling, it will |
13 | # work with 2.0 kernels as well. |
14 | # |
15 | # Last change 2.6.9-rc1, adding support for separate source and object |
16 | # trees. |
17 | # |
18 | # The source must be compiled/assembled first, the object files |
19 | # are the primary input to this script. Incomplete or missing |
20 | # objects will result in a flawed analysis. Compile both vmlinux |
21 | # and modules. |
22 | # |
23 | # Even with complete objects, treat the result of the analysis |
24 | # with caution. Some external references are only used by |
25 | # certain architectures, others with certain combinations of |
26 | # configuration parameters. Ideally the source should include |
27 | # something like |
28 | # |
29 | # #ifndef CONFIG_... |
30 | # static |
31 | # #endif |
32 | # symbol_definition; |
33 | # |
34 | # so the symbols are defined as static unless a particular |
35 | # CONFIG_... requires it to be external. |
36 | # |
37 | # A symbol that is suffixed with '(export only)' has these properties |
38 | # |
39 | # * It is global. |
40 | # * It is marked EXPORT_SYMBOL or EXPORT_SYMBOL_GPL, either in the same |
41 | # source file or a different source file. |
42 | # * Given the current .config, nothing uses the symbol. |
43 | # |
44 | # The symbol is a candidate for conversion to static, plus removal of the |
45 | # export. But be careful that a different .config might use the symbol. |
46 | # |
47 | # |
48 | # Name space analysis and cleanup is an iterative process. You cannot |
49 | # expect to find all the problems in a single pass. |
50 | # |
51 | # * Identify possibly unnecessary global declarations, verify that they |
52 | # really are unnecessary and change them to static. |
53 | # * Compile and fix up gcc warnings about static, removing dead symbols |
54 | # as necessary. |
55 | # * make clean and rebuild with different configs (especially |
56 | # CONFIG_MODULES=n) to see which symbols are being defined when the |
57 | # config does not require them. These symbols bloat the kernel object |
58 | # for no good reason, which is frustrating for embedded systems. |
59 | # * Wrap config sensitive symbols in #ifdef CONFIG_foo, as long as the |
60 | # code does not get too ugly. |
61 | # * Repeat the name space analysis until you can live with with the |
62 | # result. |
63 | # |
64 | |
65 | require 5; # at least perl 5 |
66 | use strict; |
67 | use File::Find; |
68 | |
69 | my $nm = "/usr/bin/nm -p"; |
70 | my $objdump = "/usr/bin/objdump -s -j .comment"; |
71 | my $srctree = ""; |
72 | my $objtree = ""; |
73 | $srctree = "$ENV{'srctree'}/" if (exists($ENV{'srctree'})); |
74 | $objtree = "$ENV{'objtree'}/" if (exists($ENV{'objtree'})); |
75 | |
76 | if ($#ARGV != -1) { |
77 | print STDERR "usage: $0 takes no parameters\n"; |
78 | die("giving up\n"); |
79 | } |
80 | |
81 | my %nmdata = (); # nm data for each object |
82 | my %def = (); # all definitions for each name |
83 | my %ksymtab = (); # names that appear in __ksymtab_ |
84 | my %ref = (); # $ref{$name} exists if there is a true external reference to $name |
85 | my %export = (); # $export{$name} exists if there is an EXPORT_... of $name |
86 | |
87 | &find(\&linux_objects, '.'); # find the objects and do_nm on them |
88 | &list_multiply_defined(); |
89 | &resolve_external_references(); |
90 | &list_extra_externals(); |
91 | |
92 | exit(0); |
93 | |
94 | sub linux_objects |
95 | { |
96 | # Select objects, ignoring objects which are only created by |
97 | # merging other objects. Also ignore all of modules, scripts |
98 | # and compressed. Most conglomerate objects are handled by do_nm, |
99 | # this list only contains the special cases. These include objects |
100 | # that are linked from just one other object and objects for which |
101 | # there is really no permanent source file. |
102 | my $basename = $_; |
103 | $_ = $File::Find::name; |
104 | s:^\./::; |
105 | if (/.*\.o$/ && |
106 | ! ( |
107 | m:/built-in.o$: |
108 | || m:arch/i386/kernel/vsyscall-syms.o$: |
109 | || m:arch/ia64/ia32/ia32.o$: |
110 | || m:arch/ia64/kernel/gate-syms.o$: |
111 | || m:arch/ia64/lib/__divdi3.o$: |
112 | || m:arch/ia64/lib/__divsi3.o$: |
113 | || m:arch/ia64/lib/__moddi3.o$: |
114 | || m:arch/ia64/lib/__modsi3.o$: |
115 | || m:arch/ia64/lib/__udivdi3.o$: |
116 | || m:arch/ia64/lib/__udivsi3.o$: |
117 | || m:arch/ia64/lib/__umoddi3.o$: |
118 | || m:arch/ia64/lib/__umodsi3.o$: |
119 | || m:arch/ia64/scripts/check_gas_for_hint.o$: |
120 | || m:arch/ia64/sn/kernel/xp.o$: |
121 | || m:boot/bbootsect.o$: |
122 | || m:boot/bsetup.o$: |
123 | || m:/bootsect.o$: |
124 | || m:/boot/setup.o$: |
125 | || m:/compressed/: |
126 | || m:drivers/cdrom/driver.o$: |
127 | || m:drivers/char/drm/tdfx_drv.o$: |
128 | || m:drivers/ide/ide-detect.o$: |
129 | || m:drivers/ide/pci/idedriver-pci.o$: |
130 | || m:drivers/media/media.o$: |
131 | || m:drivers/scsi/sd_mod.o$: |
132 | || m:drivers/video/video.o$: |
133 | || m:fs/devpts/devpts.o$: |
134 | || m:fs/exportfs/exportfs.o$: |
135 | || m:fs/hugetlbfs/hugetlbfs.o$: |
136 | || m:fs/msdos/msdos.o$: |
137 | || m:fs/nls/nls.o$: |
138 | || m:fs/ramfs/ramfs.o$: |
139 | || m:fs/romfs/romfs.o$: |
140 | || m:fs/vfat/vfat.o$: |
141 | || m:init/mounts.o$: |
142 | || m:^modules/: |
143 | || m:net/netlink/netlink.o$: |
144 | || m:net/sched/sched.o$: |
145 | || m:/piggy.o$: |
146 | || m:^scripts/: |
147 | || m:sound/.*/snd-: |
148 | || m:^.*/\.tmp_: |
149 | || m:^\.tmp_: |
150 | || m:/vmlinux-obj.o$: |
151 | ) |
152 | ) { |
153 | do_nm($basename, $_); |
154 | } |
155 | $_ = $basename; # File::Find expects $_ untouched (undocumented) |
156 | } |
157 | |
158 | sub do_nm |
159 | { |
160 | my ($basename, $fullname) = @_; |
161 | my ($source, $type, $name); |
162 | if (! -e $basename) { |
163 | printf STDERR "$basename does not exist\n"; |
164 | return; |
165 | } |
166 | if ($fullname !~ /\.o$/) { |
167 | printf STDERR "$fullname is not an object file\n"; |
168 | return; |
169 | } |
170 | ($source = $fullname) =~ s/\.o$//; |
171 | if (-e "$objtree$source.c" || -e "$objtree$source.S") { |
172 | $source = "$objtree$source"; |
173 | } else { |
174 | $source = "$srctree$source"; |
175 | } |
176 | if (! -e "$source.c" && ! -e "$source.S") { |
177 | # No obvious source, exclude the object if it is conglomerate |
178 | if (! open(OBJDUMPDATA, "$objdump $basename|")) { |
179 | printf STDERR "$objdump $fullname failed $!\n"; |
180 | return; |
181 | } |
182 | my $comment; |
183 | while (<OBJDUMPDATA>) { |
184 | chomp(); |
185 | if (/^In archive/) { |
186 | # Archives are always conglomerate |
187 | $comment = "GCC:GCC:"; |
188 | last; |
189 | } |
190 | next if (! /^[ 0-9a-f]{5,} /); |
191 | $comment .= substr($_, 43); |
192 | } |
193 | close(OBJDUMPDATA); |
194 | if (!defined($comment) || $comment !~ /GCC\:.*GCC\:/m) { |
195 | printf STDERR "No source file found for $fullname\n"; |
196 | } |
197 | return; |
198 | } |
199 | if (! open(NMDATA, "$nm $basename|")) { |
200 | printf STDERR "$nm $fullname failed $!\n"; |
201 | return; |
202 | } |
203 | my @nmdata; |
204 | while (<NMDATA>) { |
205 | chop; |
206 | ($type, $name) = (split(/ +/, $_, 3))[1..2]; |
207 | # Expected types |
208 | # A absolute symbol |
209 | # B weak external reference to data that has been resolved |
210 | # C global variable, uninitialised |
211 | # D global variable, initialised |
212 | # G global variable, initialised, small data section |
213 | # R global array, initialised |
214 | # S global variable, uninitialised, small bss |
215 | # T global label/procedure |
216 | # U external reference |
217 | # W weak external reference to text that has been resolved |
218 | # a assembler equate |
219 | # b static variable, uninitialised |
220 | # d static variable, initialised |
221 | # g static variable, initialised, small data section |
222 | # r static array, initialised |
223 | # s static variable, uninitialised, small bss |
224 | # t static label/procedures |
225 | # w weak external reference to text that has not been resolved |
226 | # ? undefined type, used a lot by modules |
227 | if ($type !~ /^[ABCDGRSTUWabdgrstw?]$/) { |
228 | printf STDERR "nm output for $fullname contains unknown type '$_'\n"; |
229 | } |
230 | elsif ($name =~ /\./) { |
231 | # name with '.' is local static |
232 | } |
233 | else { |
234 | $type = 'R' if ($type eq '?'); # binutils replaced ? with R at one point |
235 | # binutils keeps changing the type for exported symbols, force it to R |
236 | $type = 'R' if ($name =~ /^__ksymtab/ || $name =~ /^__kstrtab/); |
237 | $name =~ s/_R[a-f0-9]{8}$//; # module versions adds this |
238 | if ($type =~ /[ABCDGRSTW]/ && |
239 | $name ne 'init_module' && |
240 | $name ne 'cleanup_module' && |
241 | $name ne 'Using_Versions' && |
242 | $name !~ /^Version_[0-9]+$/ && |
243 | $name !~ /^__parm_/ && |
244 | $name !~ /^__kstrtab/ && |
245 | $name !~ /^__ksymtab/ && |
246 | $name !~ /^__kcrctab_/ && |
247 | $name !~ /^__exitcall_/ && |
248 | $name !~ /^__initcall_/ && |
249 | $name !~ /^__kdb_initcall_/ && |
250 | $name !~ /^__kdb_exitcall_/ && |
251 | $name !~ /^__module_/ && |
252 | $name !~ /^__mod_/ && |
253 | $name !~ /^__crc_/ && |
254 | $name ne '__this_module' && |
255 | $name ne 'kernel_version') { |
256 | if (!exists($def{$name})) { |
257 | $def{$name} = []; |
258 | } |
259 | push(@{$def{$name}}, $fullname); |
260 | } |
261 | push(@nmdata, "$type $name"); |
262 | if ($name =~ /^__ksymtab_/) { |
263 | $name = substr($name, 10); |
264 | if (!exists($ksymtab{$name})) { |
265 | $ksymtab{$name} = []; |
266 | } |
267 | push(@{$ksymtab{$name}}, $fullname); |
268 | } |
269 | } |
270 | } |
271 | close(NMDATA); |
272 | if ($#nmdata < 0) { |
273 | if ( |
274 | $fullname ne "lib/brlock.o" |
275 | && $fullname ne "lib/dec_and_lock.o" |
276 | && $fullname ne "fs/xfs/xfs_macros.o" |
277 | && $fullname ne "drivers/ide/ide-probe-mini.o" |
278 | && $fullname ne "usr/initramfs_data.o" |
279 | && $fullname ne "drivers/acpi/executer/exdump.o" |
280 | && $fullname ne "drivers/acpi/resources/rsdump.o" |
281 | && $fullname ne "drivers/acpi/namespace/nsdumpdv.o" |
282 | && $fullname ne "drivers/acpi/namespace/nsdump.o" |
283 | && $fullname ne "arch/ia64/sn/kernel/sn2/io.o" |
284 | && $fullname ne "arch/ia64/kernel/gate-data.o" |
285 | && $fullname ne "drivers/ieee1394/oui.o" |
286 | && $fullname ne "security/capability.o" |
287 | && $fullname ne "sound/core/wrappers.o" |
288 | && $fullname ne "fs/ntfs/sysctl.o" |
289 | && $fullname ne "fs/jfs/jfs_debug.o" |
290 | ) { |
291 | printf "No nm data for $fullname\n"; |
292 | } |
293 | return; |
294 | } |
295 | $nmdata{$fullname} = \@nmdata; |
296 | } |
297 | |
298 | sub drop_def |
299 | { |
300 | my ($object, $name) = @_; |
301 | my $nmdata = $nmdata{$object}; |
302 | my ($i, $j); |
303 | for ($i = 0; $i <= $#{$nmdata}; ++$i) { |
304 | if ($name eq (split(' ', $nmdata->[$i], 2))[1]) { |
305 | splice(@{$nmdata{$object}}, $i, 1); |
306 | my $def = $def{$name}; |
307 | for ($j = 0; $j < $#{$def{$name}}; ++$j) { |
308 | if ($def{$name}[$j] eq $object) { |
309 | splice(@{$def{$name}}, $j, 1); |
310 | } |
311 | } |
312 | last; |
313 | } |
314 | } |
315 | } |
316 | |
317 | sub list_multiply_defined |
318 | { |
319 | my ($name, $module); |
320 | foreach $name (keys(%def)) { |
321 | if ($#{$def{$name}} > 0) { |
322 | # Special case for cond_syscall |
323 | if ($#{$def{$name}} == 1 && $name =~ /^sys_/ && |
324 | ($def{$name}[0] eq "kernel/sys.o" || |
325 | $def{$name}[1] eq "kernel/sys.o")) { |
326 | &drop_def("kernel/sys.o", $name); |
327 | next; |
328 | } |
329 | # Special case for i386 entry code |
330 | if ($#{$def{$name}} == 1 && $name =~ /^__kernel_/ && |
331 | $def{$name}[0] eq "arch/i386/kernel/vsyscall-int80.o" && |
332 | $def{$name}[1] eq "arch/i386/kernel/vsyscall-sysenter.o") { |
333 | &drop_def("arch/i386/kernel/vsyscall-sysenter.o", $name); |
334 | next; |
335 | } |
336 | printf "$name is multiply defined in :-\n"; |
337 | foreach $module (@{$def{$name}}) { |
338 | printf "\t$module\n"; |
339 | } |
340 | } |
341 | } |
342 | } |
343 | |
344 | sub resolve_external_references |
345 | { |
346 | my ($object, $type, $name, $i, $j, $kstrtab, $ksymtab, $export); |
347 | printf "\n"; |
348 | foreach $object (keys(%nmdata)) { |
349 | my $nmdata = $nmdata{$object}; |
350 | for ($i = 0; $i <= $#{$nmdata}; ++$i) { |
351 | ($type, $name) = split(' ', $nmdata->[$i], 2); |
352 | if ($type eq "U" || $type eq "w") { |
353 | if (exists($def{$name}) || exists($ksymtab{$name})) { |
354 | # add the owning object to the nmdata |
355 | $nmdata->[$i] = "$type $name $object"; |
356 | # only count as a reference if it is not EXPORT_... |
357 | $kstrtab = "R __kstrtab_$name"; |
358 | $ksymtab = "R __ksymtab_$name"; |
359 | $export = 0; |
360 | for ($j = 0; $j <= $#{$nmdata}; ++$j) { |
361 | if ($nmdata->[$j] eq $kstrtab || |
362 | $nmdata->[$j] eq $ksymtab) { |
363 | $export = 1; |
364 | last; |
365 | } |
366 | } |
367 | if ($export) { |
368 | $export{$name} = ""; |
369 | } |
370 | else { |
371 | $ref{$name} = "" |
372 | } |
373 | } |
374 | elsif ( $name ne "mod_use_count_" |
375 | && $name ne "__initramfs_end" |
376 | && $name ne "__initramfs_start" |
377 | && $name ne "_einittext" |
378 | && $name ne "_sinittext" |
379 | && $name ne "kallsyms_names" |
380 | && $name ne "kallsyms_num_syms" |
381 | && $name ne "kallsyms_addresses" |
382 | && $name ne "__this_module" |
383 | && $name ne "_etext" |
384 | && $name ne "_edata" |
385 | && $name ne "_end" |
386 | && $name ne "__bss_start" |
387 | && $name ne "_text" |
388 | && $name ne "_stext" |
389 | && $name ne "__gp" |
390 | && $name ne "ia64_unw_start" |
391 | && $name ne "ia64_unw_end" |
392 | && $name ne "__init_begin" |
393 | && $name ne "__init_end" |
394 | && $name ne "__bss_stop" |
395 | && $name ne "__nosave_begin" |
396 | && $name ne "__nosave_end" |
397 | && $name ne "pg0" |
398 | && $name ne "__module_text_address" |
399 | && $name !~ /^__sched_text_/ |
400 | && $name !~ /^__start_/ |
401 | && $name !~ /^__end_/ |
402 | && $name !~ /^__stop_/ |
403 | && $name !~ /^__scheduling_functions_.*_here/ |
404 | && $name !~ /^__.*initcall_/ |
405 | && $name !~ /^__.*per_cpu_start/ |
406 | && $name !~ /^__.*per_cpu_end/ |
407 | && $name !~ /^__alt_instructions/ |
408 | && $name !~ /^__setup_/ |
409 | && $name !~ /^jiffies/ |
410 | && $name !~ /^__mod_timer/ |
411 | && $name !~ /^__mod_page_state/ |
412 | && $name !~ /^init_module/ |
413 | && $name !~ /^cleanup_module/ |
414 | ) { |
415 | printf "Cannot resolve "; |
416 | printf "weak " if ($type eq "w"); |
417 | printf "reference to $name from $object\n"; |
418 | } |
419 | } |
420 | } |
421 | } |
422 | } |
423 | |
424 | sub list_extra_externals |
425 | { |
426 | my %noref = (); |
427 | my ($name, @module, $module, $export); |
428 | foreach $name (keys(%def)) { |
429 | if (! exists($ref{$name})) { |
430 | @module = @{$def{$name}}; |
431 | foreach $module (@module) { |
432 | if (! exists($noref{$module})) { |
433 | $noref{$module} = []; |
434 | } |
435 | push(@{$noref{$module}}, $name); |
436 | } |
437 | } |
438 | } |
439 | if (%noref) { |
440 | printf "\nExternally defined symbols with no external references\n"; |
441 | foreach $module (sort(keys(%noref))) { |
442 | printf " $module\n"; |
443 | foreach (sort(@{$noref{$module}})) { |
444 | if (exists($export{$_})) { |
445 | $export = " (export only)"; |
446 | } |
447 | else { |
448 | $export = ""; |
449 | } |
450 | printf " $_$export\n"; |
451 | } |
452 | } |
453 | } |
454 | } |