diff options
Diffstat (limited to 'doc/bdirect.txt')
| -rw-r--r-- | doc/bdirect.txt | 712 |
1 files changed, 0 insertions, 712 deletions
diff --git a/doc/bdirect.txt b/doc/bdirect.txt deleted file mode 100644 index 9731171cc..000000000 --- a/doc/bdirect.txt +++ /dev/null @@ -1,712 +0,0 @@ --Bdirect linking: - -+ need to elide 'vague linkage' stuff [ re-use regexp map logic ? ] - -+ behaves like an optimial -Bsymbolic in-library + -+ stores library index [1 per symbol ?] for the dynamic sym table - [ sol seems to do somewhat better than that ] - -+ elflink.c: - - bfd_boolean - bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info, - struct elf_link_hash_entry *h) - - + calls _bfd_elf_strtab_add (...) - + sets (elf_link_hash_entry) h->dynstr_index to that ... - + of course - string table can contain anything (?) - + we want a symbol-table index (?) - - .dynsym <symbol data> .dynstr <string data> - + Precisely 1 entry in '.direct' for every entry - in .dynsym - + elf_hash_table(info)->dynsymcount ... - - + bfd_elf_size_dynamic_sections: - + working nicely - - + Need the list of external libraries (section?) - + what is that ? - + DT_NEEDED ? - + lots of NEEDED libs - + get a clear order ? - + [ elf_add_dt_needed_tag ]: - + goes through '.dynamic' section - + pages in all Elf_Internal_Dyn records - + sub-sets on DT_NEEDED - + etc. ... - + slow but reliable ;-) - + *Should* - + count index of existing DT_NEEDEDs - + copy elf_dt_name (bfd) -*** & assign elf_dt_index (bfd) - + then just use elsewhere ... - - + elf_link_output_extsym ... - + build .direct here ... - + use the 'bfd_link_hash_entry' - + switch on type - + for 'def' - + asection *section [ symbol section ] - + [ what it resolves to ? ] - + is this the post link data ? - + [ what about weak / multiple hits !? ] - + section->owner == bfd ... - + bfd.h:3942 - + const char *filename - + elf_dt_name (bfd) = soname ... - (const char *) - + so we can get that easily. - - + grok for -Bsymbolic foo ... - + Carefully examine the -Bsymbolic - platform-dependent piece .. - + looks like an optimisation with - copy relocs -* notes: - + bfd_link_hash_entry: include/bfdlink.h - + elf_link_hash_entry: bfd/eld-bfd.h - + asection - bfd_section ? (bfd-in2.h) - - -* FIXME: - + executables - also require this data ... - [ check code paths etc. ... ] - + do we need a new SHT_DIRECT section header ? - -* Need to nail objdump: - - % elfdump -y prog - - Syminfo Section: .SUNW_syminfo - index flgs bound to symbol - ... - [15] DBL [1] ./foo.so foo - [19] DBL [3] ./bar.so bar - - -bfd_set_section_contents (?) - + end of elf_link_input_bfd: - + end of bfd_elf_final_link ... etc. - + default ... o->flags & SEC_EXCLUDE (?) - - -** Runtime linker ... - + cf. doc/link.txt: - - + include/link.h: (struct link_map): - + l_searchlist - array of DT_NEEDED deps. - + [ in what order ? ] - + what is l_reldeps ? - - + dl-lookup.c (_dl_lookup_symbol_x): hack here ... - - + run /opt/gcc/bin/ld-linux.so <file> explicitely ? - + work out how to re-build & install elf quickly ... [!?] - -libfixup.so - 31 symbols - + 16bytes per sym - in .dynsym - - Elf32_Word st_name; - 4b - Elf32_Addr st_value; - 4b - Elf32_Word st_size; - 4b - unsigned char st_info; - 1 - unsigned char st_other; - 1 - Elf32_Section st_shndx; - 2 - - + ie 16bytes overall. - - + ie. _dl_lookup_symbol_x gets an Elf32_Sym **ref, - + but we want an index instead ... - + symbol versioning ? / hash ? - - + -Bdirect - foo... - - + relocations ... - + rel.dyn - <addr> <r_info> - symbol index ... - - + cf. do-rel.h (elf_dynamic_do_rel): - + calls -> elf_machine_rel - + passing &symtab[ELFW(R_SYM) (r->r_info)] - - -+ where is elf_machine_rel defined (!?) - + sysdeps/i386/dl-machine.h - -+ can we see if the sym reference is inside: - const ElfW(Sym) *const symtab = - (const void *) D_PTR (map, l_info[DT_SYMTAB]); - - + could it ever be inside anything else ? if not why - have that hard-coded ? - + the elf_dynamic_do_rel - passes several sets of - + relocation types to elf_dynamic_do_##reloc - - + Ergo - everything (so far) looked up in - DT_SYMTAB (.dynsym) - -** test harness - + app was crashing since linked with -shared ;-) - -** Linker test framework: - + '~/bin/run' - prefix=/opt/gcc - sysroot= - ulimit -c unlimited - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$prefix/lib:$sysroot/lib:$sysroot/usr/X11R6/lib:$sysroot/usr/lib:$sysroot/usr/local/lib:$sysroot/usr/openwin/lib:$sysroot/opt/kde3/lib:$sysroot/opt/gnome/lib:$sysroot/opt/gnome2/lib:$sysroot/opt/mozilla/lib" - $prefix/lib/ld-linux.so.2 $@ - + use it to test the generated binaries ... - - -** Glibc build bits - + setup kernel headers - + symlink asm-i386 -> asm - + add to glibc/version.h: - #define CVSDATE "cvsdate" - #define CONFHOST "i586-suse-linux" - + hack sysd-sorted: move 'elf' to the front - -+ binutils - + readelf ... - + 0xffff - unknown - + 0xfffe - vague - + 0 - self ... - - -+ Bit count for DT_NEEDED index: - ls /opt/*/lib/*.so /usr/lib/*.so /usr/X11/lib/*.so /lib/*.so | wc -l - 533 - + But we link to -very- few normally - * need DT_NEEDED * stats ... - - + LD_PRELOAD (etc.) - + add 'preloads' to head of dt_needed - add an offset ? - + have a global 'preload' scope (?) - + [what about a preload's recursive deps ?] - - -** Ultimate numbers: - + Before new glibc: - + 3968, 3978, 3983 Avg: 3980 - + With new glibc [ no other changes ] - + 4224, 4238, 4250 Avg: 4240 - + ie. 280ms slower [urgh ...] - + With <many> libraries -Bdirected - + 2378, 2387, 2389 Avg: 2385 - + 40% faster (warm) startup - + measure time over dlopen ... - + With dlopen top/tail gettimeofdays: - + no -Bdirect: 2.693, 2.721, 2.714 - + with it: 0.970, 0.968, 0.956 - -** Remaining issues: - - * How are new elf sections allocated ? and/or typically named - I know DT_DIRECT / '.direct' are prolly beyond the pale - - * How should I handle LD_PRELOADs in the direct dl-lookup.c - case ? - we should still do them clearly. Perhaps it'd - be possible to use the first N entries of the existing - searchlist (?) - - * Is there a better way to achieve what I do in dl-deps.c ? - the umpteen-string compares are clearly evil. - - * In binutils - what is the best way to filter out the - important 'Vague Linkage' symbols ? clearly we don't want to - bind any of them - the current approach is clearly a gross - hack. - + should we propagate this information from target - libraries ? ie. libc can advertise 'foo_baa' as not - to be direct linked against ? - + should the compiler generate / markup the vague - linkage pieces to avoid yet-another link map type - thing ? - - * If we fail to find the symbol in the direct scope should we - check the dependants of that library - to allow some limited - re-factoring later ? or just fallback to the global scope ? - - * Should we compress the .direct table more ? I can't envisage - more than 12bits (4096) of DT_NEEDED libraries ever - prolly - we should mask / save that space for future expansion - along with a few special values perhaps ? - - - + Do we need to add an 'index' to - + _bfd_generic_link_add_one_symbol (?) - sym -> value -> etc. ? - [ a section & and offset ] - * bfd_asymbol_value = base + value (?) - + [ Can we cram 1 bit into there ? - we really want a 'is-vague' marker ] - + can be generated earlier ... - + is-vague, unknown, is-concrete tristate ? - + seems to be 1 hash table ... - + linear load of symbols into it ... - + _bfd_elf_merge_symbol (?!) - + we return a new 'h' in *sym_hash ... - + need to setup foo on it ... - + 'elf_link_add_object_symbols' - + here !? ... - -** You have to export LD_BIND_DIRECT=1 - -* TODO: - + add 'direct' section in *applications* - + only use .direct if it is enabled in the app (etc.) - + make sure the app has a *sane* .direct section - + odd things seem to happen here ... - + (?!) - - -+ Without -Bdirect: - 28% of startup == do_lookup_x - -+ [Foo!] - + baa ... - - + for a in *.so; do readelf -r -W $a | grep '_ZThn' | cut -c 53-256 | sort | uniq; done | wc -l - 15661 - + for a in *.so; do readelf -r -W $a | grep -v '_ZThn' | cut -c 53-256 | sort | uniq; done | wc -l -164475 - + perhaps an extra 10% of relocations ... - + but are these plt or rel32 ? - grok again ? - - -* New patch: - + Way better ... - + works really nicely - + for a in *.so; do if /opt/gcc/bin/objdump -x $a | grep DIRECT >& /dev/null; then echo "$a: direct"; else echo "$a: no direct"; fi; done | grep 'no direct' - libdb-4.2.so: no direct - libdb_java-4.2.so: no direct - libxmlsec1-nss.so: no direct - libxmlsec1.so: no direct - - -A diff of LD_DEBUG=bindings - + LD_DEBUG=bindings xml2cmp -types stdout ../../../unxlngi6.pro/misc/vbaobj.xml >& /tmp/indirect - -michael@linux:/opt/OpenOffice/src680-m140/sc/source/ui/vba> diff /tmp/direct.2nd /tmp/indirect.2nd -1135c1135 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL4cerrE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL4cerrE' - - This is (apparently) a static variable [ tagged extern in the header ] - cf. STLport-4.5/lib/obj/GCC/ReleaseD/iostream.o: - 000002a0 g O .bss 00000064 _ZN4_STL4cerrE - STLport-4.5/src/iostream.cpp: _STLP_DECLSPEC ostream cerr(0); - cf. Every instance in xml2cmp/unxlngi6.pro/obj/*: - 00000000 *UND* 00000000 _ZN4_STL4cerrE - Do we link with 2 copies - 1 static, 1 dynamic ? - - g++ -Wl,-z,combreloc -Wl,-z,defs -Wl,-rpath,'$ORIGIN' -Wl,-Bdirect -Wl,-export-dynamic -Wl,--noinhibit-exec -L../unxlngi6.pro/lib -L../lib -L/opt/OpenOffice/src680-m140/solenv/unxlngi6/lib -L/opt/OpenOffice/src680-m140/solver/680/unxlngi6.pro/lib -L/opt/OpenOffice/src680-m140/solenv/unxlngi6/lib -L/usr/lib/jvm/java/lib -L/usr/lib/jvm/java/jre/lib/i386 -L/usr/lib/jvm/java/jre/lib/i386/client -L/usr/lib/jvm/java/jre/lib/i386/native_threads -L/usr/X11R6/lib -L/opt/mozilla/lib \ - ../unxlngi6.pro/obj/main.o \ - ../unxlngi6.pro/obj/cr_html.o \ - ../unxlngi6.pro/obj/cr_index.o \ - ../unxlngi6.pro/obj/cr_metho.o \ - ../unxlngi6.pro/obj/filebuff.o \ - ../unxlngi6.pro/obj/parse.o \ - ../unxlngi6.pro/obj/xmlelem.o \ - ../unxlngi6.pro/obj/xmltree.o \ - \ - ../unxlngi6.pro/obj/cmdline.o \ - ../unxlngi6.pro/obj/heap.o \ - ../unxlngi6.pro/obj/sistr.o \ - ../unxlngi6.pro/obj/syshelp.o \ - ../unxlngi6.pro/obj/badcast.o \ - -ldl -lpthread -lm -Wl,-Bdynamic -lstlport_gcc -o ../unxlngi6.pro/bin/xml2cmp - -rwxr-xr-x 1 michael users 152248 2005-11-30 12:20 ../unxlngi6.pro/bin/xml2cmp - ------------- - michael@linux:/opt/OpenOffice/src680-m140/xml2cmp/util> objdump -T ../unxlngi6.pro/bin/xml2cmp | grep cerr - 08061960 g DO .bss 00000064 _ZN4_STL4cerrE - - + Wow - it deliberately creates this duplicate DO .bss symbol [!?] why !? - -1158c1158 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL13_Filebuf_base12_M_page_sizeE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL13_Filebuf_base12_M_page_sizeE' - + symbol: _STL::_Filebuf_base::_M_page_size - + again undefined in xml2cmp's *.o - - -1160c1160 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_base6badbitE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL8ios_base6badbitE' -1286c1286 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL8numpunctIcE2idE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL8numpunctIcE2idE' -1294c1294 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL7codecvtIcc15__stl_mbstate_tE2idE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL7codecvtIcc15__stl_mbstate_tE2idE' -1301c1301 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL4coutE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL4coutE' -1347c1347 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_base7goodbitE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL8ios_base7goodbitE' - - symbol: _STL::ios_base::goodbit - -1360c1360 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL5ctypeIcE2idE' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL5ctypeIcE2idE' -1440c1440 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE6xsgetnEPci' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE6xsgetnEPci' -1442c1442 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE5uflowEv' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE5uflowEv' -1444,1445c1444,1445 -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE6xsputnEPKci' -< 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE10_M_xsputncEci' ---- -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE6xsputnEPKci' -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE10_M_xsputncEci' -2334a2335,2380 -> 7507: binding file xml2cmp to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEE6xsputnEPKci' -> 7507: binding file /libstlport_gcc.so to /lib/tls/libc.so.6: normal symbol `putc' [GLIBC_2.0] -> 7507: binding file xml2cmp to /usr/lib/libstdc++.so.6: normal symbol `_ZdlPv' [GLIBCXX_3.4] -> 7507: binding file xml2cmp to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_base4InitD1Ev' -> 7507: binding file xml2cmp to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_base9_Loc_initD1Ev' -> 7507: binding file /lib/tls/libc.so.6 to /lib/tls/libc.so.6: normal symbol `free' [GLIBC_2.0] -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_base15_S_uninitializeEv' -> 7507: binding file /libstlport_gcc.so to xml2cmp: normal symbol `_ZN4_STL9basic_iosIcNS_11char_traitsIcEEE5rdbufEPNS_15basic_streambufIcS2_EE' -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_SgI20stdio_streambuf_baseD2Ev' -> 7507: binding file /libstlport_gcc.so to /lib/tls/libc.so.6: normal symbol `fflush' [GLIBC_2.0] -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIcNS_11char_traitsIcEEED2Ev' -> 7507: binding file /libstlport_gcc.so to /usr/lib/libstdc++.so.6: normal symbol `_ZdlPv' [GLIBCXX_3.4] -> com.sun.star.uno.XComponentContext 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL13basic_filebufIwNS_11char_traitsIwEEE5closeEv' -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL13_Filebuf_base8_M_closeEv' -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL13basic_filebufIwNS_11char_traitsIwEEE21_M_deallocate_buffersEv' -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL15basic_streambufIwNS_11char_traitsIwEEED2Ev' -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_baseD2Ev' -> 7507: -> 7507: calling fini: /lib/libdl.so.2 [0] -> 7507: -> 7507: binding file /lib/libdl.so.2 to /lib/tls/libc.so.6: normal symbol `__cxa_finalize' [GLIBC_2.1.3] -> 7507: -> 7507: calling fini: /lib/tls/libpthread.so.0 [0] -> 7507: -> 7507: binding file /lib/tls/libpthread.so.0 to /lib/tls/libc.so.6: normal symbol `__cxa_finalize' [GLIBC_2.1.3] -> 7507: -> 7507: calling fini: /libstlport_gcc.so [0] -> 7507: -> 7507: binding file /libstlport_gcc.so to /lib/tls/libc.so.6: normal symbol `__cxa_finalize' [GLIBC_2.1.3] -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL8ios_base9_Loc_initD1Ev' -> 7507: binding file /libstlport_gcc.so to /libstlport_gcc.so: normal symbol `_ZN4_STL6locale15_S_uninitializeEv' -> 7507: -> 7507: calling fini: /usr/lib/libstdc++.so.6 [0] -> 7507: -> 7507: binding file /usr/lib/libstdc++.so.6 to /lib/tls/libc.so.6: normal symbol `__cxa_finalize' [GLIBC_2.1.3] -> 7507: -> 7507: calling fini: /lib/tls/libm.so.6 [0] -> 7507: -> 7507: binding file /lib/tls/libm.so.6 to /lib/tls/libc.so.6: normal symbol `__cxa_finalize' [GLIBC_2.1.3] -> 7507: -> 7507: calling fini: /lib/libgcc_s.so.1 [0] -> 7507: -> 7507: binding file /lib/libgcc_s.so.1 to /lib/tls/libc.so.6: normal symbol `__cxa_finalize' [GLIBC_2.1.3] -> 7507: -> 7507: calling fini: /lib/tls/libc.so.6 [0] -> 7507: - - - -$ objdump -T `which xml2cmp` | grep '_ZN4_STL4cerrE' -08061960 g DO .bss 00000064 _ZN4_STL4cerrE -$ objdump -T /opt/OpenOffice/src680-m140/solver/680/unxlngi6.pro/lib/libstlport_gcc.so | grep 'STL4cerr' -000c5200 g DO .bss 00000064 Base _ZN4_STL4cerrE - - URK !? - why !? - what is the linker thinking ? - - + bfd: syms.c: - 'DO' == BSF_OBJECT && BSF_DYNAMIC - -elf.c: - else if ((flags & BSF_OBJECT) != 0) - type = STT_OBJECT; - - -<micha> That should be the COPY relocs, right? -<micha> Accessing global data from shared apps needs to produce a COPY -reloc in the app and of course the associated space (of the size of -the symbol) in .bss -<michael_> quite possibly, -<michael_> it's something I didn't understand, -* michael_ needs to learn about COPY relocs, -* michael_ has no real idea why it is necessary to have a COPY reloc, -<micha> Ah, I can explain that ;) -<michael_> but - what I do see, is that eg. libstlport's -Bdirect -links directly to it's copy of 'cerr' and the main app to it's ;-) -<michael_> => seriously bad things happen, -<micha> That shouldn't happen, right. Every reference to such symbol -needs to refer to the copy of the app. -<michael_> right; -<michael_> but - presumably this also wastes a ton of space ? -* michael_ wonders how much .bss bloat gets caused by this, -<michael_> all vtables are 'DO' it seems -<michael_> I guess it's only for things referred to in the main app -though; so ... -<micha> Hmm, wait, I can't explain it fully if I think about it. It's -a i386 ABI only thingy, and applies only to apps which themself are -not compiled PIC, i.e. refer to the symbol in question directly, -instead of using the GOT. - - + Can we elide potential COPY_RELOCs - by skipping - + 'D' symbols in dl-lookup.c ? yes - is this slow though ? - - + How many 'D' symbols are we talking about ? - + how many relocs point to them ? - + more relocstat maths ? - - -** LD_PRELOAD investigation ... - -*** An LD_PRELOAD has the following effect: - -michael@linux:/opt/gcc/src/test> LD_LIBRARY_PATH=. LD_DEBUG=direct LD_PRELOAD=/opt/gnome/lib/libgtk-x11-2.0.so:/opt/gnome/lib/libORBit-2.so:/opt/gnome/lib/libglib-2.0.so ./ld-linux.so.2 ./app 2>&1 | grep Append - 25334: Append object 0 '' - 25334: Append object 1 '/opt/gnome/lib/libgtk-x11-2.0.so' - 25334: Append object 2 '/opt/gnome/lib/libORBit-2.so' - 25334: Append object 3 '/opt/gnome/lib/libglib-2.0.so' - - + Hence by storing map->npreloads - - we can foo the baa ? - + just by taking 1->npreloads from l_searchlist.r_list ...x - - + What happens for the other libraries though ? - + 'openaux' - calling into libc ... - - 25334: Append object 4 './liblib.so' - 25334: Append object 5 './libfixup.so' - 25334: Append object 6 './libb.so' - 25334: Append object 7 './liba.so' - 25334: Append object 8 '/usr/lib/libstdc++.so.6' - 25334: Append object 9 '/lib/tls/libm.so.6' - 25334: Append object 10 '/lib/libgcc_s.so.1' - 25334: Append object 11 '/lib/tls/libc.so.6' - 25334: Append object 12 '/opt/gnome/lib/libgdk_pixbuf-2.0.so.0' - 25334: Append object 13 '/opt/gnome/lib/libgdk-x11-2.0.so.0' - 25334: Append object 14 '/opt/gnome/lib/libpangocairo-1.0.so.0' - 25334: Append object 15 '/opt/gnome/lib/libpango-1.0.so.0' - 25334: Append object 16 '/opt/gnome/lib/libatk-1.0.so.0' - 25334: Append object 17 '/opt/gnome/lib/libgobject-2.0.so.0' - 25334: Append object 18 '/opt/gnome/lib/libgmodule-2.0.so.0' - 25334: Append object 19 '/lib/libdl.so.2' - 25334: Append object 20 '/usr/lib/libcairo.so.2' - 25334: Append object 21 '/usr/lib/libfreetype.so.6' - 25334: Append object 22 '/usr/lib/libfontconfig.so.1' - 25334: Append object 23 '/usr/X11R6/lib/libXrender.so.1' - 25334: Append object 24 '/usr/X11R6/lib/libX11.so.6' - 25334: Append object 25 '/usr/X11R6/lib/libXext.so.6' - 25334: Append object 26 '/usr/lib/libpng12.so.0' - 25334: Append object 27 '/lib/libz.so.1' - 25334: Append object 28 '/usr/lib/libglitz.so.1' - 25334: Append object 29 '/usr/lib/libpopt.so.0' - 25334: Append object 30 '/opt/gnome/lib/libgthread-2.0.so.0' - 25334: Append object 31 '/lib/tls/libpthread.so.0' - 25334: Append object 32 './ld-linux.so.2' - 25334: Append object 33 '/usr/X11R6/lib/libXrandr.so.2' - 25334: Append object 34 '/usr/X11R6/lib/libXi.so.6' - 25334: Append object 35 '/usr/X11R6/lib/libXinerama.so.1' - 25334: Append object 36 '/usr/X11R6/lib/libXcursor.so.1' - 25334: Append object 37 '/usr/X11R6/lib/libXfixes.so.3' - 25334: Append object 38 '/opt/gnome/lib/libpangoft2-1.0.so.0' - 25334: Append object 39 '/usr/lib/libexpat.so.0' - -Fixme: - map->l_faked (?!) - + affects order of l_searchlist ... - + 'preloads' - local to 'dl_main' - + do_preload called a lot. - + discarded after use ... - - + how does the recursive load of sub-libraries work ? - + do they get preloads ? - + openaux - calling into libc itself ? - + => no debug (?) - + openaux - -> (dl-load.c): _dl_map_object - -> always passes '0' for preloaded. - -> [ a boolean anyway ] - -> _dl_new_object - + how do dependant libs get their - l_searchpath setup ?, or even their - direct section ? - + 'dl_open_worker' - + calls dl_map_object_deps ... - - + Where does the searchlist come from !? - - - -*** No reliable timing is possible on SL 10.0 ... - + the thing is impossible ... - + use the 'gettimeofday' patch ? - -New numbers: - -LD_BIND_DIRECT - no redirect: - -003250 1 } PERFORMANCE - DesktopOpenClients_Impl() -003732 1 } PERFORMANCE - DesktopOpenClients_Impl() -003243 1 } PERFORMANCE - DesktopOpenClients_Impl() -003666 1 } PERFORMANCE - DesktopOpenClients_Impl() - - - -LD_BIND_DIRECT & after 'redirect' - -005086 1 } PERFORMANCE - DesktopOpenClients_Impl() -004942 1 } PERFORMANCE - DesktopOpenClients_Impl() -004747 1 } PERFORMANCE - DesktopOpenClients_Impl() -004755 1 } PERFORMANCE - DesktopOpenClients_Impl() - -005086 004942 004747 004755 + + + p 4 / p -Avg: 4882ms - - -** (re-install) package ** - -rpm -U --replacefiles --replacepkgs ... - - -no LD_BIND_DIRECT: -006361 1 } PERFORMANCE - DesktopOpenClients_Impl() -005964 1 } PERFORMANCE - DesktopOpenClients_Impl() -006172 1 } PERFORMANCE - DesktopOpenClients_Impl() -006324 1 } PERFORMANCE - DesktopOpenClients_Impl() - -006361 005964 006172 006324 + + + p 4 / p - -Avg: 6205ms - -Saving: 1325ms - -With a heavily instrumented, consistent glibc RPM: -I get: - - 7414: _dl_map_object_deps '' - 7414: Append object 0 '' - 7414: Append object 1 '/opt/gnome/lib/libglib.so' - 7414: Append object 2 '/lib/tls/librt.so.1' - 7414: Append object 3 '/lib/libacl.so.1' - 7414: Append object 4 '/lib/libselinux.so.1' - 7414: Append object 5 '/lib/tls/libc.so.6' - 7414: Append object 6 '/lib/tls/libpthread.so.0' - 7414: Append object 7 '/lib/ld-linux.so.2' - 7414: Append object 8 '/lib/libattr.so.1' - 7414: no dl_direct set 0 - 7414: - 7414: calling init: /lib/tls/libpthread.so.0 - 7414: - 7414: - 7414: calling init: /lib/tls/libc.so.6 - 7414: - 7414: - 7414: calling init: /lib/libattr.so.1 - 7414: - 7414: - 7414: calling init: /lib/libselinux.so.1 - 7414: - 7414: - 7414: calling init: /lib/libacl.so.1 - 7414: - 7414: - 7414: calling init: /lib/tls/librt.so.1 - 7414: - 7414: - 7414: calling init: /opt/gnome/lib/libglib.so - 7414: - 7414: - 7414: initialize program: /bin/ls - 7414: - 7414: - 7414: transferring control: /bin/ls - 7414: - 7414: _dl_map_object_deps '/lib/libnss_compat.so.2' - 7414: Append object 0 '/lib/libnss_compat.so.2' - 7414: Append object 1 '/lib/libnsl.so.1' - 7414: Append object 2 '/lib/tls/libc.so.6' - 7414: Append object 3 '/lib/ld-linux.so.2' - 7414: no dl_direct set 0 - 7414: - 7414: calling init: /lib/libnsl.so.1 - 7414: - 7414: - 7414: calling init: /lib/libnss_compat.so.2 - 7414: - 7414: _dl_map_object_deps '/lib/libnss_nis.so.2' - 7414: Append object 0 '/lib/libnss_nis.so.2' - 7414: Append object 1 '/lib/libnsl.so.1' - 7414: Append object 2 '/lib/libnss_files.so.2' - 7414: Append object 3 '/lib/tls/libc.so.6' - 7414: Append object 4 '/lib/ld-linux.so.2' - 7414: no dl_direct set 0 - 7414: - 7414: calling init: /lib/libnss_files.so.2 - 7414: - 7414: - 7414: calling init: /lib/libnss_nis.so.2 - 7414: -/dev/null - - ie. _dl_map_object_deps is not called for most objects ... - + however - it is clearly called for all dlopened' ones. - => how is l_searchlist constructed per map ? - + Only 'main' objects have non-NULL l_searchlists ... (clearly) - + => can't be used for 'ld_preload' ? - + can't we have a 'global' preload list though ? - + hence '-z interpose' ? - + simplify the code (?) - perhaps not ... - - preload deps of course - - - -** The salcpprt problem: - - + salcpprt.lib - 'operators' - + we link 'libsalcpprt.so' - + [ AH ! ... for solaris - no -Bdirect for this ] - + '-z interpose' - - + On Linux: a static library: - + linked into ~everything. - -objdump -t ../unxlngi6.pro/lib/libsalcpprt.a | grep -v '\*UND\*' -In archive ../unxlngi6.pro/lib/libsalcpprt.a: - -operators_new_delete.o: file format elf32-i386 - -SYMBOL TABLE: -00000020 g F .text 0000002a _ZdlPv -0000010a g F .text 0000002a _ZdaPv -00000134 g F .text 0000002a _Znaj -0000015e g F .text 0000002a _ZdaPvRKSt9nothrow_t -00000188 g F .text 0000002e _ZnajRKSt9nothrow_t -000001b6 g F .text 0000002a _Znwj -000001e0 g F .text 0000002a _ZdlPvRKSt9nothrow_t -0000020a g F .text 0000002e _ZnwjRKSt9nothrow_t -00000000 l F .text 0000001f _Z10deallocatePvRKN105_GLOBAL__N__opt_OpenOffice_ooo_build_build_oob680_m1_sal_cpprt_operators_new_delete.cxx_00000000_3241DF7B15AllocatorTraitsE -0000004a l F .text 0000008e _Z8allocatejRKN105_GLOBAL__N__opt_OpenOffice_ooo_build_build_oob680_m1_sal_cpprt_operators_new_delete.cxx_00000000_3241DF7B15AllocatorTraitsE -00000238 l F .text 00000034 _Z15default_handlerv -000000d8 l F .text 00000032 _Z8allocatejRKN105_GLOBAL__N__opt_OpenOffice_ooo_build_build_oob680_m1_sal_cpprt_operators_new_delete.cxx_00000000_3241DF7B15AllocatorTraitsERKSt9nothrow_t -00000008 g O .rodata 00000008 _ZN105_GLOBAL__N__opt_OpenOffice_ooo_build_build_oob680_m1_sal_cpprt_operators_new_delete.cxx_00000000_3241DF7B12ScalarTraits11g_signatureE -00000000 g O .rodata 00000008 _ZN105_GLOBAL__N__opt_OpenOffice_ooo_build_build_oob680_m1_sal_cpprt_operators_new_delete.cxx_00000000_3241DF7B12VectorTraits11g_signatureE -00000000 w O .data.DW.ref.__gxx_personality_v0 00000004 .hidden DW.ref.__gxx_personality_v0 -00000000 l d DW.ref.__gxx_personality_v0 00000000 .group -00000000 l d DW.ref._ZTISt9bad_alloc 00000000 .group -00000000 l d .data.DW.ref.__gxx_personality_v0 00000000 .data.DW.ref.__gxx_personality_v0 -00000000 l d .data.DW.ref._ZTISt9bad_alloc 00000000 .data.DW.ref._ZTISt9bad_alloc -00000000 w O .data.DW.ref._ZTISt9bad_alloc 00000004 .hidden DW.ref._ZTISt9bad_alloc |