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* MFC r270798:kib2014-09-121-0/+4
| | | | | | | | | | Process STT_GNU_IFUNC when doing non-plt relocations. MFC r270802: Only do the second pass over non-plt relocations when the first pass found IFUNCs. Approved by: re (gjb)
* Revert r253748,253749avg2013-07-281-0/+1
| | | | | | This WIP should not have been committed yet. Pointyhat to: avg
* remove needless inclusion of machine/cpu.h in userlandavg2013-07-281-1/+0
| | | | MFC after: 21 days
* Avoid use of register variables, which some compilers (e.g. clang)nwhitehorn2013-02-081-9/+5
| | | | | | don't like. It makes the code a little clearer as well. MFC after: 1 week
* Add GNU hash support for rtld.kib2012-04-301-1/+1
| | | | | | | Based on dragonflybsd support for GNU hash by John Marino <draco marino st> Reviewed by: kan Tested by: bapt MFC after: 2 weeks
* Use xmalloc() instead of malloc() in the places where malloc() callskib2012-03-221-1/+1
| | | | | | | | | | | | | | | are assumed to not fail. Make the xcalloc() calling conventions follow the calloc(3) calling conventions and replace unchecked calls to calloc() with calls to xcalloc(). Remove redundand declarations from xmalloc.c, which are already present in rtld.h. Reviewed by: kan Discussed with: bde MFC after: 2 weeks
* Fix several problems with our ELF filters implementation.kib2012-03-201-11/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Do not relocate twice an object which happens to be needed by loaded binary (or dso) and some filtee opened due to symbol resolution when relocating need objects. Record the state of the relocation processing in Obj_Entry and short-circuit relocate_objects() if current object already processed. Do not call constructors for filtees loaded during the early relocation processing before image is initialized enough to run user-provided code. Filtees are loaded using dlopen_object(), which normally performs relocation and initialization. If filtee is lazy-loaded during the relocation of dso needed by the main object, dlopen_object() runs too earlier, when most runtime services are not yet ready. Postpone the constructors call to the time when main binary and depended libraries constructors are run, passing the new flag RTLD_LO_EARLY to dlopen_object(). Symbol lookups callers inform symlook_* functions about early stage of initialization with SYMLOOK_EARLY. Pass flags through all functions participating in object relocation. Use the opportunity and fix flags argument to find_symdef() in arch-specific reloc.c to use proper name SYMLOOK_IN_PLT instead of true, which happen to have the same numeric value. Reported and tested by: theraven Reviewed by: kan MFC after: 2 weeks
* Additional icache paranoia: non-PLT relocations can modify the text segment.nwhitehorn2011-12-171-2/+5
| | | | | | | It is then important to make sure the icache is synchronized again to prevent (rare) random seg faults and illegal instructions. MFC after: 3 days
* Add support for STT_GNU_IFUNC and R_MACHINE_IRELATIVE GNU extensions tokib2011-12-121-0/+16
| | | | | | | | | | | | | | | | | rtld on 386 and amd64. This adds runtime bits neccessary for the use of the dispatch functions from the dynamically-linked executables and shared libraries. To allow use of external references from the dispatch function, resolution of the R_MACHINE_IRESOLVE relocations in PLT is postponed until GOT entries for PLT are prepared, and normal resolution of the GOT entries is finished. Similar to how it is done by GNU, IRELATIVE relocations are resolved in advance, instead of normal lazy handling for PLT. Move the init_pltgot() call before the relocations for the object are processed. MFC after: 3 weeks
* Remove dead code that snuck in from the 32-bit PowerPC version of thisnwhitehorn2011-03-071-4/+0
| | | | file. The error being checked for does not exist on 64-bit systems.
* Add support for R_PPC64_UADDR64 relocations.nwhitehorn2011-01-031-1/+2
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* Implement support for ELF filters in rtld. Both normal and auxillarykib2010-12-251-17/+20
| | | | | | | | | | | | | | | | | filters are implemented. Filtees are loaded on demand, unless LD_LOADFLTR environment variable is set or -z loadfltr was specified during the linking. This forces rtld to upgrade read-locked rtld_bind_lock to write lock when it encounters an object with filter during symbol lookup. Consolidate common arguments of the symbol lookup functions in the SymLook structure. Track the state of the rtld locks in the RtldLockState structure. Pass local RtldLockState through the rtld symbol lookup calls to allow lock upgrades. Reviewed by: kan Tested by: Mykola Dzham <i levsha me>, nwhitehorn (powerpc)
* Check for undefined weak symbols during PLT binding on powerpc64, and donwhitehorn2010-09-121-2/+7
| | | | | | | not attempt to copy NULL function descriptors. This fixes LD_BIND_NOW on powerpc64 after r211706. Reviewed by: kib
* RTLD support for powerpc64. A few small modifications to the Makefilenwhitehorn2010-07-101-0/+493
and symbol map are required to support various consequences of the dot symbol scheme: - Symbols beginning with a dot are reserved, so start private symbols with an underscore. - In order to set RTLD breakpoints, gdb must be able to locate the text entry point, not the data section function descriptor, so add .r_debug_state to the symbol map on powerpc64. Obtained from: projects/ppc64
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