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2012-06-15ppc/elfinterp.c: fix comment typosPeter S. Mazinger
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15dl-hash.h: remove unused _dl_symbol and unneeded prototypesPeter S. Mazinger
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15libdl.c: hide dl_cleanupPeter S. Mazinger
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15dl-elf.h: remove unused prototypePeter S. Mazinger
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15libdl.c,dl-string.h: do not use inlined _dl_memset and others in libdlPeter S. Mazinger
Use the one from libc. While there, remove unused _dl_strncmp() and superfluos static forward declarations. Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15ldso: use .arm mode for resolver unconditionallyBernhard Reutner-Fischer
as per comment in the file. Fixes runtime with __THUMB_INTERWORK__ enabled. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-13Update C6X supportMark Salter
This patch updates the C6X support to work with latest uClibc code and uses reworked DSBT support to allow using kernel FDPIC loader. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-06ldso: preload standard path library with setuid bit setFilippo Arcidiacono
For set-user-ID/set-group-ID ELF binaries, only libraries in the standard search directories that are also set-user-ID must be loaded. This patch fixes existing logic according to the above statement. Furthermore if either library setuid bit isn't set or it cannot be found in the standard search path, the library won't be preloaded but execution go ahead with default one. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-06Clean up DSBT supportMark Salter
The existing DSBT support relies on the kernel to provide DSBT info as part of the load maps passed to user space. The problem with this approach is that the DSBT info is in the dynamic section, so the kernel must access a userspace mapping of the dynamic section (or separately read a copy for the kernel) in order to retrieve the information needed by userspace. This patch reworks the DSBT support to remove the reliance on DSBT info coming from the kernel. Instead, ldso reads the info itself from the dynamic section. One other benefit of this is that it allows the existing kernel FDPIC loader to also load DSBT binaries. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-05-18ldso: sh: handle _dl_skip_args in linker startup instead of __uClibc_mainFilippo Arcidiacono
Handle _dl_skip_args in the asm part of the dynamic linker startup, to skip the ldso arguments, so we can keep this symbol hidden as other archs do. Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2012-04-08ldso: fix fdpic support broken from prelink patchFilippo Arcidiacono
The fdpic support has been broken since the prelink support was added, because it didn't take into account DL_LOADADDR_TYPE could be a different type of ElfW(Addr). Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-03-29ldso: mark _start hiddenMike Frysinger
There's no need to export this symbol, so mark them all hidden. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-03-27ldso: bfin: add alias from __start to _startMike Frysinger
On Blackfin systems, we have underscore prefixes in our ABI. So instead of _start, we use __start. However, the makefile explicitly sets _start as the entry point to support toolchains that implicitly use other symbols as the default entry. It's easy enough to add a hidden alias in the Blackfin code for free to support this. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-03-26ldso: bfin: tweak styleMike Frysinger
No functional changes here. We don't need line continuations as gcc is smart enough to merge the multiple strings for us. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-03-25ldso: use ELF_xxx()/ElfW() helpersMike Frysinger
They expand into the same code, but using the ELF_xxx()/ElfW() macros makes it much easier to spot similarities between code bases. Acked-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> Acked-by: Carmelo Amoroso <carmelo.amoroso@st.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-03-15ldso: remove duplicated assignment with TLS symbolCarmelo Amoroso
The tpnt field is already set, so not needed to assign it again. Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2012-03-14ldso:sh: fix compiler warning due to unused-but-set-variableCarmelo Amoroso
gcc 4.6.x raises useful warnings due to unused-but-set-variable, This patch fixes the following one by using properly preprocessor guard In file included from ldso/libdl/libdl.c:129:0: ./ldso/ldso/sh/elfinterp.c: In function '_dl_do_reloc': ./ldso/ldso/sh/elfinterp.c:163:22: warning: variable 'tls_tpnt' set but not used [-Wunused-but-set-variable] Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2012-02-09libdl: fix memleak for local scope of dlopened's needed librariesFilippo Arcidiacono
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2012-01-27ldso: fix typo in debug messageBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-01-23ldso/mips: fix symbol lookup for JUMP_SLOT and COPY relocationsCarmelo Amoroso
Fill properly the sym_ref fields when invoking _dl_find_hash to lookup symbols Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com> Signed-off-by: Khem Raj <raj.khem@gmail.com>
2012-01-23libdl: fix dlclose handling of symbol scopeCarmelo Amoroso
Defer removal of the local scope of a dl-opened library after all the destructors (of itself and related dependencies) are actually get unloaded, otherwise any function registered via atexit() won't be resolved. Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com> Signed-off-by: Khem Raj <raj.khem@gmail.com> Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
2012-01-23mips/libdl: Apply relocations after appending the new scopeKhem Raj
Without this the relocations for the current shared object are not resolved since the scope is not added to map yet Signed-off-by: Khem Raj <raj.khem@gmail.com>
2012-01-14buildsys: cache build flags in varsMike Frysinger
Running `make clean` atm takes like 20 seconds because every subdir re-evaluates all the toolchain flags. Add some helpers to automate the process of setting up variables to cache the result of tests, as well as the checking of an already set flag. Now `make clean` takes like 2 seconds on my system. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-01-02ldso: setup search path even when there are no "/"Mike Frysinger
If people use an interp path such as "ld.so", then there is no "/" found, and we end up dereferencing a NULL pointer. Simplify the logic by having a relative interp path like that be the same as "" (which the code later on interprets as $PWD). While we're here, document some of the nuances of this code. Reported-by: Ignacy Gawędzki <uclibc@qult.net> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2012-01-02ldso: simplify interp path search logicMike Frysinger
The setup logic is duplicated, so unify it in a local func. Mark the variable const while we're doing this, and add missing ifdef protection to the header that declares it availability. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-12-22libdl: rudimentary locking for dlopen/dlsym/dlcloseTimo Teräs
This implements big-dlfcn lock to allow multithreaded usage of dlopen/dlsym/dlclose. We should really clean up the dl code so we can use more fine grained locking or even RCU where appropriate. But at least we won't crash now. Signed-off-by: Timo Teräs <timo.teras@iki.fi> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-11-27ldso: bfin: fix sram_flags initMike Frysinger
An earlier version had this, but was lost as code was shuffled around. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-11-27ldso: bfin: shrink sram mapping funcMike Frysinger
The L1 data and L2 code paths duplicate a lot, so unify them. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-11-27ldso: fdpic: clean up styleMike Frysinger
There should (hopefully) be no functional changes here. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-11-27ldso: fdpic: unify duplicate bfin/frv logicMike Frysinger
Much of the logic in the bfin/frv subdirs is FDPIC specific and not arch specific. So start a new fdpic/ subdir to keep common things. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-11-27ldso: use __func__ rather than __FUNCTION__Mike Frysinger
The former is part of a standard (C99) while the latter is not. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-11-23libdl: fix size parameter when unmap library in dlcloseFilippo Arcidiacono
Fix size parameter when unmap a library by means of dlclose, by taking into account the p_vaddr of first PT_LOAD segment, so it works also for prelinked shared objects. Unmapping of dlopen shared libraries is broken since 94cc6edb78a12655c0602a246fa1cbdc8c6d0ad9 Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-11-07ldso: support RTLD_NOLOADTimo Teräs
So application query if specified module is loaded or not with dlopen. Signed-off-by: Timo Teräs <timo.teras@iki.fi> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-25ldso: let people disable to lookup into LD_LIBRARY_PATHCarmelo Amoroso
On hardened system it could be useful to disable the use of LD_LIBRARY_PATH. Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-10-25ldso: minor fixes to implicit search pathCarmelo Amoroso
Do not defined _dl_ldsopatch if implicit search path if not enabled, and avoid to call search_for_named_library (even if it is able to handle NULL search path). Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-10-25ldso: disable the implicit path search in stand-alone mode as wellCarmelo Amoroso
Honour LDSO_SEARCH_INTERP_PATH knob option also when running in stand-alone mode. Signed-off-by: Rune <u-uclibc-y2lt@aetey.se> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-10-19libdl: remove _dl_ldsopath from libdl.aCarmelo Amoroso
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-10-14ldso: silence harmless warning for !LDSO_PRELINK_SUPPORTBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-06ldso: unify pread syscall definitionMike Frysinger
A few arches want pread() defined, so move it to common code. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-06ldso: bfin/frv: drop dead simulator codeMike Frysinger
Nowhere do we define DYNAMIC_LOADER_IN_SIMULATOR, so drop the little bit of code that depends on it. At least in the Blackfin case, we can run an FDPIC ldso just fine under the simulator without hacks. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-06ldso: merge duplicate dl-syscalls.h code to common headerMike Frysinger
Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-06microblaze mmu/elf/shared lib supportRyan Flux
microblaze can either be with mmu or without If with, use elf rather than flat, and support shared libs Signed-off-by: Ryan Flux <ryan.flux@emsolutions.com.au> Signed-off-by: Steve Bennett <steveb@workware.net.au> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-01ldso: x86_64: delete unused variableMike Frysinger
gcc informed me: In file included from ldso/ldso/ldso.c:46:0: ldso/ldso/x86_64/elfinterp.c: In function '_dl_do_lazy_reloc': ldso/ldso/x86_64/elfinterp.c:294:6: warning: variable 'symtab_index' set but not used [-Wunused-but-set-variable] Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-10-01ldso: constify reloc array itselfMike Frysinger
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-08-26ldso: fix build with PRELINK enabled and !TLSCarmelo Amoroso
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-08-26ldso: add missing includeBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-07-27ldso/mips: Clean up warningsKevin Cernekee
Trivial fixes for these warnings: CC ldso/libdl/libdl.oS In file included from ldso/ldso/ldso.c:46:0: ldso/ldso/mips/elfinterp.c:88:1: warning: no previous prototype for '__dl_runtime_pltresolve' ldso/ldso/ldso.c: In function '_dl_get_ready_to_run': ldso/ldso/ldso.c:475:5: warning: assignment makes pointer from integer without a cast In file included from ldso/ldso/ldso.c:1097:0: ldso/ldso/dl-elf.c: In function '_dl_load_elf_shared_library': ldso/ldso/dl-elf.c:811:3: warning: assignment makes pointer from integer without a cast Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-07-27ldso/mips: dlsym() incorrectly matches undefined symbolsKevin Cernekee
check_match() relies on checking for (sym->st_value == 0) to see if the symbol is undefined. This works reasonably well on most architectures, such as ARM or i386: $ readelf -s /lib32/libcap.so.2 | grep -E "\<malloc\>" 17: 00000000 0 FUNC GLOBAL DEFAULT UND malloc@GLIBC_2.0 (2) However, on MIPS, libbfd puts nonzero data in the st_value field to facilitate resetting the symbol's GOT entry if the library that defines the symbol gets unloaded: $ mipsel-linux-readelf -s libfoo.so | grep -E "\<malloc\>" 74: 00003140 0 FUNC GLOBAL DEFAULT UND malloc This can cause check_match to report a false positive when examining the external symbol reference. Consequently dlsym() will return a bad pointer to the caller. Use the special MIPS logic from glibc-ports-2.13 to avoid this situation. Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-07-27ldso/mips: Enable bootstrap relocationsKevin Cernekee
_dl_reltypes_tab[] is an array of pointers to constant strings: Contents of section .data: 20000 01000000 02000000 00000000 00000000 ................ 20010 70e50000 7ce50000 88e50000 94e50000 p...|........... ^^^^^^^^ ^^^^^^^^ ^^^^^^^^ ^^^^^^^^ (pointers are LE) Contents of section .rodata: e570 525f4d49 50535f4e 4f4e4500 525f4d49 R_MIPS_NONE.R_MI e580 50535f31 36000000 525f4d49 50535f33 PS_16...R_MIPS_3 e590 32000000 525f4d49 50535f52 454c3332 2...R_MIPS_REL32 These pointers require relocation: DYNAMIC RELOCATION RECORDS OFFSET TYPE VALUE 00000000 R_MIPS_NONE *ABS* 0001fffc R_MIPS_REL32 *ABS* 00020010 R_MIPS_REL32 *ABS* 00020014 R_MIPS_REL32 *ABS* 00020018 R_MIPS_REL32 *ABS* On MIPS, only GOT relocations are currently handled by ldso during startup. The net effect is that when running with "LD_DEBUG=reloc", ldso itself crashes before the program even starts. This is caused by _dl_dprintf() dereferencing an unadjusted string pointer such as 0xe570. This patch enables the missing relocations and allows LD_DEBUG to work as designed. Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2011-07-25libdl: add option for controlling dl_cleanupRichard Braun
When debugging memory leaks with Valgrind, it is required that dynamically loaded shared objects are not unloaded when a process exits, otherwise symbols from those files aren't correctly resolved in allocation traces. This patch adds the LDSO_NO_CLEANUP configuration option to control this behaviour. Signed-off-by: Richard Braun <rbraun@sceen.net> Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
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