mirror of
https://github.com/brain-hackers/linux-brain.git
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82fdd12b95
The namespace.pl script does not work properly if objtree is not set to
an absolute path. The do_nm function is run from within the find
function, which changes directories.
Because of this, appending objtree, $File::Find::dir, and $source, will
return a path which is not valid from the current directory.
This used to work when objtree was set to an absolute path when using
"make namespacecheck". It appears to have not worked when calling
./scripts/namespace.pl directly.
This behavior was changed in 7e1c04779e ("kbuild: Use relative path
for $(objtree)", 2014-05-14)
Rather than fixing the Makefile to set objtree to an absolute path, just
fix namespace.pl to work when srctree and objtree are relative. Also fix
the script to use an absolute path for these by default.
Use the File::Spec module for this purpose. It's been part of perl
5 since 5.005.
The curdir() function is used to get the current directory when the
objtree and srctree aren't set in the environment.
rel2abs() is used to convert possibly relative objtree and srctree
environment variables to absolute paths.
Finally, the catfile() function is used instead of string appending
paths together, since this is more robust when joining paths together.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
474 lines
13 KiB
Prolog
Executable File
474 lines
13 KiB
Prolog
Executable File
#!/usr/bin/env perl
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#
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# namespace.pl. Mon Aug 30 2004
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#
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# Perform a name space analysis on the linux kernel.
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#
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# Copyright Keith Owens <kaos@ocs.com.au>. GPL.
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#
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# Invoke by changing directory to the top of the kernel object
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# tree then namespace.pl, no parameters.
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#
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# Tuned for 2.1.x kernels with the new module handling, it will
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# work with 2.0 kernels as well.
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#
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# Last change 2.6.9-rc1, adding support for separate source and object
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# trees.
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#
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# The source must be compiled/assembled first, the object files
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# are the primary input to this script. Incomplete or missing
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# objects will result in a flawed analysis. Compile both vmlinux
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# and modules.
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#
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# Even with complete objects, treat the result of the analysis
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# with caution. Some external references are only used by
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# certain architectures, others with certain combinations of
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# configuration parameters. Ideally the source should include
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# something like
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#
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# #ifndef CONFIG_...
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# static
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# #endif
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# symbol_definition;
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#
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# so the symbols are defined as static unless a particular
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# CONFIG_... requires it to be external.
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#
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# A symbol that is suffixed with '(export only)' has these properties
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#
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# * It is global.
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# * It is marked EXPORT_SYMBOL or EXPORT_SYMBOL_GPL, either in the same
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# source file or a different source file.
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# * Given the current .config, nothing uses the symbol.
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#
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# The symbol is a candidate for conversion to static, plus removal of the
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# export. But be careful that a different .config might use the symbol.
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#
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#
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# Name space analysis and cleanup is an iterative process. You cannot
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# expect to find all the problems in a single pass.
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#
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# * Identify possibly unnecessary global declarations, verify that they
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# really are unnecessary and change them to static.
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# * Compile and fix up gcc warnings about static, removing dead symbols
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# as necessary.
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# * make clean and rebuild with different configs (especially
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# CONFIG_MODULES=n) to see which symbols are being defined when the
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# config does not require them. These symbols bloat the kernel object
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# for no good reason, which is frustrating for embedded systems.
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# * Wrap config sensitive symbols in #ifdef CONFIG_foo, as long as the
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# code does not get too ugly.
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# * Repeat the name space analysis until you can live with with the
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# result.
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#
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use warnings;
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use strict;
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use File::Find;
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use File::Spec;
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my $nm = ($ENV{'NM'} || "nm") . " -p";
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my $objdump = ($ENV{'OBJDUMP'} || "objdump") . " -s -j .comment";
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my $srctree = File::Spec->curdir();
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my $objtree = File::Spec->curdir();
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$srctree = File::Spec->rel2abs($ENV{'srctree'}) if (exists($ENV{'srctree'}));
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$objtree = File::Spec->rel2abs($ENV{'objtree'}) if (exists($ENV{'objtree'}));
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if ($#ARGV != -1) {
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print STDERR "usage: $0 takes no parameters\n";
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die("giving up\n");
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}
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my %nmdata = (); # nm data for each object
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my %def = (); # all definitions for each name
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my %ksymtab = (); # names that appear in __ksymtab_
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my %ref = (); # $ref{$name} exists if there is a true external reference to $name
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my %export = (); # $export{$name} exists if there is an EXPORT_... of $name
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my %nmexception = (
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'fs/ext3/bitmap' => 1,
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'fs/ext4/bitmap' => 1,
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'arch/x86/lib/thunk_32' => 1,
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'arch/x86/lib/cmpxchg' => 1,
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'arch/x86/vdso/vdso32/note' => 1,
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'lib/irq_regs' => 1,
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'usr/initramfs_data' => 1,
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'drivers/scsi/aic94xx/aic94xx_dump' => 1,
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'drivers/scsi/libsas/sas_dump' => 1,
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'lib/dec_and_lock' => 1,
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'drivers/ide/ide-probe-mini' => 1,
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'usr/initramfs_data' => 1,
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'drivers/acpi/acpia/exdump' => 1,
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'drivers/acpi/acpia/rsdump' => 1,
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'drivers/acpi/acpia/nsdumpdv' => 1,
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'drivers/acpi/acpia/nsdump' => 1,
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'arch/ia64/sn/kernel/sn2/io' => 1,
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'arch/ia64/kernel/gate-data' => 1,
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'security/capability' => 1,
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'fs/ntfs/sysctl' => 1,
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'fs/jfs/jfs_debug' => 1,
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);
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my %nameexception = (
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'mod_use_count_' => 1,
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'__initramfs_end' => 1,
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'__initramfs_start' => 1,
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'_einittext' => 1,
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'_sinittext' => 1,
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'kallsyms_names' => 1,
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'kallsyms_num_syms' => 1,
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'kallsyms_addresses'=> 1,
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'kallsyms_offsets' => 1,
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'kallsyms_relative_base'=> 1,
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'__this_module' => 1,
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'_etext' => 1,
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'_edata' => 1,
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'_end' => 1,
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'__bss_start' => 1,
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'_text' => 1,
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'_stext' => 1,
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'__gp' => 1,
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'ia64_unw_start' => 1,
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'ia64_unw_end' => 1,
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'__init_begin' => 1,
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'__init_end' => 1,
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'__bss_stop' => 1,
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'__nosave_begin' => 1,
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'__nosave_end' => 1,
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'pg0' => 1,
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'vdso_enabled' => 1,
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'__stack_chk_fail' => 1,
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'VDSO32_PRELINK' => 1,
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'VDSO32_vsyscall' => 1,
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'VDSO32_rt_sigreturn'=>1,
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'VDSO32_sigreturn' => 1,
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);
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&find(\&linux_objects, '.'); # find the objects and do_nm on them
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&list_multiply_defined();
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&resolve_external_references();
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&list_extra_externals();
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exit(0);
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sub linux_objects
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{
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# Select objects, ignoring objects which are only created by
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# merging other objects. Also ignore all of modules, scripts
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# and compressed. Most conglomerate objects are handled by do_nm,
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# this list only contains the special cases. These include objects
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# that are linked from just one other object and objects for which
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# there is really no permanent source file.
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my $basename = $_;
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$_ = $File::Find::name;
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s:^\./::;
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if (/.*\.o$/ &&
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! (
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m:/built-in.a$:
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|| m:arch/x86/vdso/:
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|| m:arch/x86/boot/:
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|| m:arch/ia64/ia32/ia32.o$:
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|| m:arch/ia64/kernel/gate-syms.o$:
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|| m:arch/ia64/lib/__divdi3.o$:
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|| m:arch/ia64/lib/__divsi3.o$:
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|| m:arch/ia64/lib/__moddi3.o$:
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|| m:arch/ia64/lib/__modsi3.o$:
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|| m:arch/ia64/lib/__udivdi3.o$:
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|| m:arch/ia64/lib/__udivsi3.o$:
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|| m:arch/ia64/lib/__umoddi3.o$:
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|| m:arch/ia64/lib/__umodsi3.o$:
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|| m:arch/ia64/scripts/check_gas_for_hint.o$:
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|| m:arch/ia64/sn/kernel/xp.o$:
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|| m:boot/bbootsect.o$:
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|| m:boot/bsetup.o$:
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|| m:/bootsect.o$:
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|| m:/boot/setup.o$:
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|| m:/compressed/:
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|| m:drivers/cdrom/driver.o$:
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|| m:drivers/char/drm/tdfx_drv.o$:
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|| m:drivers/ide/ide-detect.o$:
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|| m:drivers/ide/pci/idedriver-pci.o$:
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|| m:drivers/media/media.o$:
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|| m:drivers/scsi/sd_mod.o$:
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|| m:drivers/video/video.o$:
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|| m:fs/devpts/devpts.o$:
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|| m:fs/exportfs/exportfs.o$:
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|| m:fs/hugetlbfs/hugetlbfs.o$:
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|| m:fs/msdos/msdos.o$:
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|| m:fs/nls/nls.o$:
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|| m:fs/ramfs/ramfs.o$:
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|| m:fs/romfs/romfs.o$:
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|| m:fs/vfat/vfat.o$:
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|| m:init/mounts.o$:
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|| m:^modules/:
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|| m:net/netlink/netlink.o$:
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|| m:net/sched/sched.o$:
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|| m:/piggy.o$:
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|| m:^scripts/:
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|| m:sound/.*/snd-:
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|| m:^.*/\.tmp_:
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|| m:^\.tmp_:
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|| m:/vmlinux-obj.o$:
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|| m:^tools/:
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)
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) {
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do_nm($basename, $_);
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}
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$_ = $basename; # File::Find expects $_ untouched (undocumented)
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}
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sub do_nm
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{
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my ($basename, $fullname) = @_;
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my ($source, $type, $name);
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if (! -e $basename) {
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printf STDERR "$basename does not exist\n";
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return;
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}
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if ($fullname !~ /\.o$/) {
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printf STDERR "$fullname is not an object file\n";
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return;
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}
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($source = $basename) =~ s/\.o$//;
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if (-e "$source.c" || -e "$source.S") {
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$source = File::Spec->catfile($objtree, $File::Find::dir, $source)
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} else {
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$source = File::Spec->catfile($srctree, $File::Find::dir, $source)
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}
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if (! -e "$source.c" && ! -e "$source.S") {
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# No obvious source, exclude the object if it is conglomerate
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open(my $objdumpdata, "$objdump $basename|")
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or die "$objdump $fullname failed $!\n";
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my $comment;
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while (<$objdumpdata>) {
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chomp();
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if (/^In archive/) {
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# Archives are always conglomerate
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$comment = "GCC:GCC:";
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last;
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}
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next if (! /^[ 0-9a-f]{5,} /);
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$comment .= substr($_, 43);
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}
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close($objdumpdata);
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if (!defined($comment) || $comment !~ /GCC\:.*GCC\:/m) {
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printf STDERR "No source file found for $fullname\n";
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}
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return;
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}
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open (my $nmdata, "$nm $basename|")
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or die "$nm $fullname failed $!\n";
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my @nmdata;
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while (<$nmdata>) {
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chop;
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($type, $name) = (split(/ +/, $_, 3))[1..2];
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# Expected types
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# A absolute symbol
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# B weak external reference to data that has been resolved
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# C global variable, uninitialised
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# D global variable, initialised
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# G global variable, initialised, small data section
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# R global array, initialised
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# S global variable, uninitialised, small bss
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# T global label/procedure
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# U external reference
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# W weak external reference to text that has been resolved
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# V similar to W, but the value of the weak symbol becomes zero with no error.
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# a assembler equate
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# b static variable, uninitialised
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# d static variable, initialised
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# g static variable, initialised, small data section
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# r static array, initialised
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# s static variable, uninitialised, small bss
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# t static label/procedures
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# w weak external reference to text that has not been resolved
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# v similar to w
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# ? undefined type, used a lot by modules
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if ($type !~ /^[ABCDGRSTUWVabdgrstwv?]$/) {
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printf STDERR "nm output for $fullname contains unknown type '$_'\n";
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}
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elsif ($name =~ /\./) {
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# name with '.' is local static
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}
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else {
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$type = 'R' if ($type eq '?'); # binutils replaced ? with R at one point
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# binutils keeps changing the type for exported symbols, force it to R
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$type = 'R' if ($name =~ /^__ksymtab/ || $name =~ /^__kstrtab/);
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$name =~ s/_R[a-f0-9]{8}$//; # module versions adds this
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if ($type =~ /[ABCDGRSTWV]/ &&
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$name ne 'init_module' &&
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$name ne 'cleanup_module' &&
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$name ne 'Using_Versions' &&
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$name !~ /^Version_[0-9]+$/ &&
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$name !~ /^__parm_/ &&
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$name !~ /^__kstrtab/ &&
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$name !~ /^__ksymtab/ &&
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$name !~ /^__kcrctab_/ &&
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$name !~ /^__exitcall_/ &&
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$name !~ /^__initcall_/ &&
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$name !~ /^__kdb_initcall_/ &&
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$name !~ /^__kdb_exitcall_/ &&
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$name !~ /^__module_/ &&
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$name !~ /^__mod_/ &&
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$name !~ /^__crc_/ &&
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$name ne '__this_module' &&
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$name ne 'kernel_version') {
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if (!exists($def{$name})) {
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$def{$name} = [];
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}
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push(@{$def{$name}}, $fullname);
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}
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push(@nmdata, "$type $name");
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if ($name =~ /^__ksymtab_/) {
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$name = substr($name, 10);
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if (!exists($ksymtab{$name})) {
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$ksymtab{$name} = [];
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}
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push(@{$ksymtab{$name}}, $fullname);
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}
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}
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}
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close($nmdata);
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if ($#nmdata < 0) {
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printf "No nm data for $fullname\n"
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unless $nmexception{$fullname};
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return;
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}
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$nmdata{$fullname} = \@nmdata;
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}
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sub drop_def
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{
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my ($object, $name) = @_;
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my $nmdata = $nmdata{$object};
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my ($i, $j);
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for ($i = 0; $i <= $#{$nmdata}; ++$i) {
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if ($name eq (split(' ', $nmdata->[$i], 2))[1]) {
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splice(@{$nmdata{$object}}, $i, 1);
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my $def = $def{$name};
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for ($j = 0; $j < $#{$def{$name}}; ++$j) {
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if ($def{$name}[$j] eq $object) {
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splice(@{$def{$name}}, $j, 1);
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}
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}
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last;
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}
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}
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}
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sub list_multiply_defined
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{
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foreach my $name (keys(%def)) {
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if ($#{$def{$name}} > 0) {
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# Special case for cond_syscall
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if ($#{$def{$name}} == 1 &&
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($name =~ /^sys_/ || $name =~ /^compat_sys_/ ||
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$name =~ /^sys32_/)) {
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if($def{$name}[0] eq "kernel/sys_ni.o" ||
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$def{$name}[1] eq "kernel/sys_ni.o") {
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&drop_def("kernel/sys_ni.o", $name);
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next;
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}
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}
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printf "$name is multiply defined in :-\n";
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foreach my $module (@{$def{$name}}) {
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printf "\t$module\n";
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}
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}
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}
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}
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sub resolve_external_references
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{
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my ($kstrtab, $ksymtab, $export);
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printf "\n";
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foreach my $object (keys(%nmdata)) {
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my $nmdata = $nmdata{$object};
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for (my $i = 0; $i <= $#{$nmdata}; ++$i) {
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my ($type, $name) = split(' ', $nmdata->[$i], 2);
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if ($type eq "U" || $type eq "w") {
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if (exists($def{$name}) || exists($ksymtab{$name})) {
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# add the owning object to the nmdata
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$nmdata->[$i] = "$type $name $object";
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# only count as a reference if it is not EXPORT_...
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$kstrtab = "R __kstrtab_$name";
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$ksymtab = "R __ksymtab_$name";
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$export = 0;
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for (my $j = 0; $j <= $#{$nmdata}; ++$j) {
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if ($nmdata->[$j] eq $kstrtab ||
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$nmdata->[$j] eq $ksymtab) {
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$export = 1;
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last;
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}
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}
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if ($export) {
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$export{$name} = "";
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}
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else {
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$ref{$name} = ""
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}
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}
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elsif ( ! $nameexception{$name}
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&& $name !~ /^__sched_text_/
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&& $name !~ /^__start_/
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&& $name !~ /^__end_/
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&& $name !~ /^__stop_/
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&& $name !~ /^__scheduling_functions_.*_here/
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&& $name !~ /^__.*initcall_/
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&& $name !~ /^__.*per_cpu_start/
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&& $name !~ /^__.*per_cpu_end/
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&& $name !~ /^__alt_instructions/
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&& $name !~ /^__setup_/
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&& $name !~ /^__mod_timer/
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&& $name !~ /^__mod_page_state/
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&& $name !~ /^init_module/
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&& $name !~ /^cleanup_module/
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) {
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printf "Cannot resolve ";
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printf "weak " if ($type eq "w");
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printf "reference to $name from $object\n";
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}
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}
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}
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}
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}
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sub list_extra_externals
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{
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my %noref = ();
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|
foreach my $name (keys(%def)) {
|
|
if (! exists($ref{$name})) {
|
|
my @module = @{$def{$name}};
|
|
foreach my $module (@module) {
|
|
if (! exists($noref{$module})) {
|
|
$noref{$module} = [];
|
|
}
|
|
push(@{$noref{$module}}, $name);
|
|
}
|
|
}
|
|
}
|
|
if (%noref) {
|
|
printf "\nExternally defined symbols with no external references\n";
|
|
foreach my $module (sort(keys(%noref))) {
|
|
printf " $module\n";
|
|
foreach (sort(@{$noref{$module}})) {
|
|
my $export;
|
|
if (exists($export{$_})) {
|
|
$export = " (export only)";
|
|
} else {
|
|
$export = "";
|
|
}
|
|
printf " $_$export\n";
|
|
}
|
|
}
|
|
}
|
|
}
|