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* Move ARM specific flags to arm/Makefile.incMichal Meloun2020-04-291-0/+1
| | | | | | | | Requested by: kib MFC with: r360463 Notes: svn path=/head/; revision=360469
* Align initial-exec TLS segments to the p_vaddr % align.Konstantin Belousov2020-04-191-2/+2
| | | | | | | | | | | | | | | This is continuation of D21163/r359634, which handled the alignment for global mode. Non-x86 arches are not handled, maintainers are welcomed. Tested by: emaste Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D24366 Notes: svn path=/head/; revision=360091
* Handle non-plt IRELATIVE relocations, at least for x86.Konstantin Belousov2020-02-131-0/+9
| | | | | | | | | | | | | lld 10.0 seems to generate this relocation for rdtsc_mb() ifunc in our libc. Reported, reviewed, and tested by: dim (amd64, previous version) Discussed with: emaste Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D23652 Notes: svn path=/head/; revision=357895
* rtld: clean up Makefile.Konstantin Belousov2020-01-111-0/+6
| | | | | | | | | | | | | Move all MD statements into $MACHINE_ARCH/Makefile.inc. Unconditionally apply version script to rtld, the interpreter is not functional without it for long time. Reviewed by: brooks, emaste Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D23083 Notes: svn path=/head/; revision=356631
* rtld: attempt to fix reloc_nonplt_object TLS allocationEd Maste2019-03-291-1/+1
| | | | | | | | | | | | | allocate_tls_offset returns true on success. This still needs more testing and review, but this change is consistent with other archs. PR: 236880 Reported by: Andrew Gierth <andrew@tao11.riddles.org.uk> MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Notes: svn path=/head/; revision=345693
* Improve R_AARCH64_TLSDESC relocation.Michal Meloun2018-12-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | The original code did not support dynamically loaded libraries and used suboptimal access to TLS variables. New implementation removes lazy resolving of TLS relocation - due to flaw in TLSDESC design is impossible to switch resolver function at runtime without expensive locking. Due to this, 3 specialized resolvers are implemented: - load time resolver for TLS relocation from libraries loaded with main executable (thus with known TLS offset). - resolver for undefined thread weak symbols. - slower lazy resolver for dynamically loaded libraries with fast path for already resolved symbols. PR: 228892, 232149, 233204, 232311 MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D18417 Notes: svn path=/head/; revision=342113
* rtld-elf: compile with WANRS=4 warnings other than -Wcast-alignAlex Richardson2018-10-291-13/+13
| | | | | | | | | Reviewed By: kib Approved By: brooks (mentor) Differential Revision: https://reviews.freebsd.org/D17153 Notes: svn path=/head/; revision=339878
* Rework rtld's TLS Variant I implementation to match r326794Brooks Davis2018-09-051-0/+2
| | | | | | | | | | | | | | | | | | | | | The above commit fixed handling overaligned TLS segments in libc's TLS Variant I implementation, but rtld provides its own implementation for dynamically-linked executables which lacks these fixes. Thus, port these changes to rtld. This was previously commited as r337978 and reverted in r338149 due to exposing a bug the ARM rtld. This bug was fixed in r338317 by mmel. Submitted by: James Clarke Approved by: re (kib) Reviewed by: kbowling Testing by: kbowling (powerpc64), br (riscv), kevans (armv7) Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D16510 Notes: svn path=/head/; revision=338486
* Fix wrong offset calculation for R_ARM_TLS_TPOFF32 relocations.Michal Meloun2018-08-251-3/+1
| | | | | | | | | | | | | | | | | | TLS_TCB_SIZE is already accounted in defobj-> tlsoffset so all these symbols were incorrectly relocated by +8. Note: The only consumer (for all binaries on my ARM board) of R_ARM_TLS_TPOFF32 relocation is _ThreadRuneLocale variable. And the incorrectly relocated ThreadRuneLocale accidentally pointed to zeroed memory before memory layout change from D16510 had changed status quo. MFC after: 3 weeks Reviewed by: imp, jhb Approved by: re (marius) Notes: svn path=/head/; revision=338317
* Revert r337978: Rework rtld's TLS Variant I implementation to match r326794Brooks Davis2018-08-211-2/+0
| | | | | | | | | | Michal Meloun reports that it breaks ctype (isspace()..) related functions on armv7 so back out while we diagnose the issue. Reported by: Michal Meloun <melounmichal@gmail.com> Notes: svn path=/head/; revision=338149
* Rework rtld's TLS Variant I implementation to match r326794Brooks Davis2018-08-171-0/+2
| | | | | | | | | | | | | | | | | The above commit fixed handling overaligned TLS segments in libc's TLS Variant I implementation, but rtld provides its own implementation for dynamically-linked executables which lacks these fixes. Thus, port these changes to rtld. Submitted by: James Clarke Reviewed by: kbowling Testing byL kbowling (powerpc64), br (riscv), kevans (armv7) Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D16510 Notes: svn path=/head/; revision=337978
* o Let rtld(1) set up psABI user trap handlers prior to executing theMarius Strobl2018-02-031-0/+7
| | | | | | | | | | | | | | | | | objects' init functions instead of doing the setup via a constructor in libc as the init functions may already depend on these handlers to be in place. This gets us rid of: - the undefined order in which libc constructors as __guard_setup() and jemalloc_constructor() are executed WRT __sparc_utrap_setup(), - the requirement to link libc last so __sparc_utrap_setup() gets called prior to constructors in other libraries (see r122883). For static binaries, crt1.o still sets up the user trap handlers. o Move misplaced prototypes for MD functions in to the MD prototype section of rtld.h. o Sprinkle nitems(). Notes: svn path=/head/; revision=328834
* libexec: adoption of SPDX licensing ID tags.Pedro F. Giffuni2017-11-271-0/+2
| | | | | | | | | | | | | | | | | Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended. Notes: svn path=/head/; revision=326274
* End softfp->hardfp transition period for armWarner Losh2017-09-122-12/+14
| | | | | | | | | | | | On hard-float 32-bit arm platforms, always search for the soft float binaries in the alternative locations. Sponsored by: Netflix Differential Review: https://reviews.freebsd.org/D12274 MFC After: 1 week Notes: svn path=/head/; revision=323500
* rtld: fix warnings about redundant declarationsEric van Gyzen2017-05-261-5/+0
| | | | | | | | | | | | | Fix warnings about redundant declarations in rtld when libthr in increased to WARNS=6. Reviewed by: kib MFC after: 3 days Sponsored by: Dell EMC Differential Revision: https://reviews.freebsd.org/D10934 Notes: svn path=/head/; revision=318954
* Implement LD_BIND_NOT knob for rtld.Konstantin Belousov2017-03-152-7/+5
| | | | | | | | | | | | | | | | From the manpage: When set to a nonempty string, prevents modifications of the PLT slots when doing bindings. As result, each call of the PLT-resolved function is resolved. In combination with debug output, this provides complete account of all bind actions at runtime. Same feature exists on Linux and Solaris. Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Notes: svn path=/head/; revision=315331
* Adjust r308689 to make rtld compilable with either in-tree orKonstantin Belousov2016-11-211-1/+1
| | | | | | | | | | | | | | | | | | | (hopefully) stock gcc 4.2.1 on i386 and other arches. In particular: - Do not use %ebx in the asm constraints on i386, since rtld is compiled with -fPIC and gcc cannot handle GOT-base register reload (clang and newer gcc can). - Avoid direct use of [static N] construct in the function declaration/definion. In-tree gcc was patched to support this, but stock 4.2.1 cannot handle the feature. Requested by: bde Sponsored by: The FreeBSD Foundation MFC after: 1 week Notes: svn path=/head/; revision=308925
* Pass CPUID[1] %edx (cpu_feature), %ecx (cpu_feature2) andKonstantin Belousov2016-11-152-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | CPUID[7].%ebx (cpu_stdext_feature), %ecx (cpu_stdext_feature2) to the ifunc resolvers on x86. It is much more clean to use CPUID instruction in usermode to retrieve this information than to pass AT_HWCAP aux vector from kernel, on x86. Still, the change does allow for use of AT_HWCAP on arches where it is needed, by passing aux array to ifunc_init() initializer which should prepare arguments for ifunc resolvers. Current signature for resolvers on x86 is func_t iresolve(uint32_t cpu_feature, uint32_t cpu_feature2, uint32_t cpu_stdext_feature, uint32_t cpu_stdext_feature2); where arguments have identical meaning as the kernel variables of the same name. The ABIs allow to use resolvers with the void or shortened list of arguments. Reviewed by: jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D8448 Notes: svn path=/head/; revision=308689
* rtld-elf: use NULL instead of zero for pointers.Pedro F. Giffuni2016-04-191-1/+1
| | | | Notes: svn path=/head/; revision=298285
* Do not call callbacks for dl_iterate_phdr(3) with the rtld bind andKonstantin Belousov2016-01-201-2/+2
| | | | | | | | | | | | | | | | | | | | | phdr locks locked. This allows to call rtld services from the callback, which is only reasonable for dlopen(path, RTLD_NOLOAD) to test existence of the library in the image, and for dlsym(). The later might still be not quite safe, due to the lazy resolution of filters. To allow dropping the locks around iteration in dl_iterate_phdr(3), we insert markers to track current position between relocks. The global objects list is converted to tailq and all iterators skip markers, globallist_next() and globallist_curr() helpers are added. Reported and tested by: davide Reviewed by: kan Sponsored by: The FreeBSD Foundation MFC after: 3 weeks Notes: svn path=/head/; revision=294373
* Restore ABI variants now that ldconfig groks -soft. In addition, as aWarner Losh2016-01-181-5/+14
| | | | | | | | | | transition mechanism, if we don't have /usr/libsoft, assume that soft float ABI binaries are the default, so treat them as default binaries. When we've fully transitioned, it will make no sense to do this stat, and it will be removed. Notes: svn path=/head/; revision=294296
* Create a generalized exec hook that different architectures can hookWarner Losh2016-01-032-0/+40
| | | | | | | | | into if they need to, but default to no action. Differential Review: https://reviews.freebsd.org/D2718 Notes: svn path=/head/; revision=293066
* Use a macro to create the names for the library path names. This willWarner Losh2015-12-271-0/+1
| | | | | | | | | | allow later substitution at run time instead of compile time of the environment variable name prefix. Differential Review: https://reviews.freebsd.org/D2718 Notes: svn path=/head/; revision=292810
* Annotate arm userspace assembler sources stating their tolerance toKonstantin Belousov2015-09-291-0/+1
| | | | | | | | | | the non-executable stack. Reviewed by: andrew Sponsored by: The FreeBSD Foundation Notes: svn path=/head/; revision=288373
* IFUNC symbol type shall be processed for non-PLT relocations,Konstantin Belousov2014-08-291-0/+4
| | | | | | | | | | | | | | | | | | | | | | e.g. when a global variable is initialized with a pointer to ifunc. Add symbol type check and call resolver for STT_GNU_IFUNC symbol types when processing non-PLT relocations, but only after non-IFUNC relocations are done. The two-phase proceessing is required since resolvers may reference other symbols, which must be ready to use when resolver calls are done. Restructure reloc_non_plt() on x86 to call find_symdef() and handle IFUNC in single place. For non-x86 reloc_non_plt(), check for call for IFUNC relocation and do nothing, to avoid processing relocs twice. PR: 193048 Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Notes: svn path=/head/; revision=270798
* Align the stack in _rtld_bind_start. Normally this is called with theAndrew Turner2014-07-061-2/+5
| | | | | | | | | | | | | | | | | | | | | | correct stack alignment, however when we have a leaf function that uses thread local storage it calls __aeabi_read_tp to get the thread pointer. Neither GCC or clang see this as a function call so will align the stack to a 4-byte boundary. This may be a problem as _rtld_bind expects to be on an 8-byte boundary. The solution is to store a copy of the stack pointer and force the alignment before calling _rtld_bind. This fixes a problem with armeb where applications would crash in odd ways. It should also remove the need for a local patch to clang to force the stack alignment to an 8-byte boundary, even for leaf functions. Further testing will be needed before reverting this local change to clang as we may rely on it in other places. Reviewed by: jmg@ Notes: svn path=/head/; revision=268310
* Merging of projects/armv6, part 2Oleksandr Tymoshenko2012-08-151-1/+14
| | | | | | | Handle TLS for ARMv6 and ARMv7 Notes: svn path=/head/; revision=239269
* Ensure we align the stack to 8 bytes in rtld.Andrew Turner2012-08-041-2/+4
| | | | | | | | | | This is not strictly required with the current ABI but will be when we switch to the ARM EABI. The aapcs requires the stack to be 4 byte aligned at all times and 8 byte aligned when calling a public subroutine where the current ABI only requires sp to be a multiple of 4. Notes: svn path=/head/; revision=239031
* Add GNU hash support for rtld.Konstantin Belousov2012-04-301-1/+1
| | | | | | | | | | Based on dragonflybsd support for GNU hash by John Marino <draco marino st> Reviewed by: kan Tested by: bapt MFC after: 2 weeks Notes: svn path=/head/; revision=234841
* Fix several problems with our ELF filters implementation.Konstantin Belousov2012-03-201-11/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Notes: svn path=/head/; revision=233231
* Add support for preinit, init and fini arrays. Some ABIs, inKonstantin Belousov2012-03-111-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | particular on ARM, do require working init arrays. Traditional FreeBSD crt1 calls _init and _fini of the binary, instead of allowing runtime linker to arrange the calls. This was probably done to have the same crt code serve both statically and dynamically linked binaries. Since ABI mandates that first is called preinit array functions, then init, and then init array functions, the init have to be called from rtld now. To provide binary compatibility to old FreeBSD crt1, which calls _init itself, rtld only calls intializers and finalizers for main binary if binary has a note indicating that new crt was used for linking. Add parsing of ELF notes to rtld, and cache p_osrel value since we parsed it anyway. The patch is inspired by init_array support for DragonflyBSD, written by John Marino. Reviewed by: kan Tested by: andrew (arm, previous version), flo (sparc64, previous version) MFC after: 3 weeks Notes: svn path=/head/; revision=232831
* Add thread-local storage support for ARM to rtld-elfOleksandr Tymoshenko2012-02-142-6/+81
| | | | | | | | Reviewed by: cognet Obtained from: NetBSD Notes: svn path=/head/; revision=231618
* Add support for STT_GNU_IFUNC and R_MACHINE_IRELATIVE GNU extensions toKonstantin Belousov2011-12-121-0/+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 Notes: svn path=/head/; revision=228435
* When loading dso without PT_GNU_STACK phdr, only callKonstantin Belousov2011-01-251-0/+3
| | | | | | | | | | __pthread_map_stacks_exec() on architectures that allow executable stacks. Reported and tested by: marcel (ia64) Notes: svn path=/head/; revision=217851
* Implement support for ELF filters in rtld. Both normal and auxillaryKonstantin Belousov2010-12-251-20/+31
| | | | | | | | | | | | | | | | | | | | 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) Notes: svn path=/head/; revision=216695
* Only use the cache after the early stage of loading. This isRoman Divacky2010-05-181-8/+5
| | | | | | | | | | | | | because calling mmap() etc. may use GOT which is not set up yet. Use calloc() instead of mmap() in cases where this was the case before (sparc64, powerpc, arm). Submitted by: Dimitry Andric (dimitry andric com) Reviewed by: kan Approved by: ed (mentor) Notes: svn path=/head/; revision=208256
* The NetBSD Foundation has granted permission to remove clauses 3 and 4.Warner Losh2010-02-161-7/+0
| | | | | | | Obtained from: NetBSD Notes: svn path=/head/; revision=203973
* Now that the kernel defines CACHE_LINE_SIZE in machine/param.h, useRobert Watson2009-04-191-2/+0
| | | | | | | | | | | that definition in the custom locking code for the run-time linker rather than local definitions. Pointed out by: tinderbox MFC after: 2 weeks Notes: svn path=/head/; revision=191291
* Implement ELF symbol versioning using GNU semantics. This code aimsAlexander Kabaev2005-12-181-1/+3
| | | | | | | | | | | | to be compatible with symbol versioning support as implemented by GNU libc and documented by http://people.redhat.com/~drepper/symbol-versioning and LSB 3.0. Implement dlvsym() function to allow lookups for a specific version of a given symbol. Notes: svn path=/head/; revision=153515
* No need to provide atomic_cmpset_32() anymore.Olivier Houchard2005-04-071-12/+0
| | | | Notes: svn path=/head/; revision=144764
* Only provide the dummy, non-atomic atomic_cmpset_32() ifOlivier Houchard2005-02-261-0/+2
| | | | | | | ARM_HAS_ATOMIC_CMPSET_32 isn't defined. Notes: svn path=/head/; revision=142593
* Implement a dummy atomic_cmpset_32(). It should be safe to use it in rtld asOlivier Houchard2004-11-231-0/+11
| | | | | | | the signals are masked anyway. Notes: svn path=/head/; revision=138023
* Remove these unused files before any other archs include the same bogusJohn Baldwin2004-11-121-171/+0
| | | | | | | file. Notes: svn path=/head/; revision=137619
* Don't try to relocate the dynamic loader in reloc_non_plt(). It has alreadyOlivier Houchard2004-09-281-1/+4
| | | | | | | been done before. Notes: svn path=/head/; revision=135883
* Use add instead of saving the sp in a register.Olivier Houchard2004-09-281-2/+1
| | | | Notes: svn path=/head/; revision=135882
* Add stubs for TLS.Olivier Houchard2004-09-233-15/+30
| | | | | | | Arbitraly choose the 2nd variant until I figure out which one I should use. Notes: svn path=/head/; revision=135680
* Woohoo !Olivier Houchard2004-06-171-2/+0
| | | | | | | the latest binutils import mades this gross hack useless, so just remove it. Notes: svn path=/head/; revision=130646
* Work around a problem somewhere with binutils (?) on arm, hopefully withoutOlivier Houchard2004-05-151-0/+2
| | | | | | | breaking any other arch this time. Notes: svn path=/head/; revision=129258
* Import arm bits for rtld-elf.Olivier Houchard2004-05-145-0/+682
Obtained from: NetBSD Notes: svn path=/head/; revision=129204
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