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* Linux: Consolidate auxiliary vector parsing (redo)Florian Weimer2022-02-282-76/+14
| | | | | | | | | | | And optimize it slightly. This is commit 8c8510ab2790039e58995ef3a22309582413d3ff revised. In _dl_aux_init in elf/dl-support.c, use an explicit loop and -fno-tree-loop-distribute-patterns to avoid memset. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* build: Properly generate .d dependency files [BZ #28922]H.J. Lu2022-02-251-0/+3
| | | | | | | | | | | | | 1. Also generate .d dependency files for $(tests-container) and $(tests-printers). 2. elf: Add tst-auditmod17.os to extra-test-objs. 3. iconv: Add tst-gconv-init-failure-mod.os to extra-test-objs. 4. malloc: Rename extra-tests-objs to extra-test-objs. 5. linux: Add tst-sysconf-iov_max-uapi.o to extra-test-objs. 6. x86_64: Add tst-x86_64mod-1.o, tst-platformmod-2.o, test-libmvec.o, test-libmvec-avx.o, test-libmvec-avx2.o and test-libmvec-avx512f.o to extra-test-objs. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* elf: Check invalid hole in PT_LOAD segments [BZ #28838]H.J. Lu2022-02-211-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | Changes in v2: 1. Update commit log. commit 163f625cf9becbb82dfec63a29e566324129c0cd Author: H.J. Lu <hjl.tools@gmail.com> Date: Tue Dec 21 12:35:47 2021 -0800 elf: Remove excessive p_align check on PT_LOAD segments [BZ #28688] removed the p_align check against the page size. It caused the loader error or crash on elf/tst-p_align3 when loading elf/tst-p_alignmod3.so, which has the invalid p_align in PT_LOAD segments, added by commit d8d94863ef125a392b929732b37e07dc927fbcd1 Author: H.J. Lu <hjl.tools@gmail.com> Date: Tue Dec 21 13:42:28 2021 -0800 The loader failure caused by a negative length passed to __mprotect is random, depending on architecture and toolchain. Update _dl_map_segments to detect invalid holes. This fixes BZ #28838. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* Revert "Linux: Consolidate auxiliary vector parsing"Florian Weimer2022-02-111-4/+76
| | | | | | | | | | | | This reverts commit 8c8510ab2790039e58995ef3a22309582413d3ff. The revert is not perfect because the commit included a bug fix for _dl_sysdep_start with an empty argv, introduced in commit 2d47fa68628e831a692cba8fc9050cef435afc5e ("Linux: Remove DL_FIND_ARG_COMPONENTS"), and this bug fix is kept. The revert is necessary because the reverted commit introduced an early memset call on aarch64, which leads to crash due to lack of TCB initialization.
* elf: Remove LD_USE_LOAD_BIASAdhemerval Zanella2022-02-103-16/+1
| | | | | | | | It is solely for prelink with PIE executables [1]. [1] https://sourceware.org/legacy-ml/libc-hacker/2003-11/msg00127.html Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* malloc: Remove LD_TRACE_PRELINKING usage from mtraceAdhemerval Zanella2022-02-102-9/+16
| | | | | | | | | | | | | | | | | | | | | | The fix for BZ#22716 replacde LD_TRACE_LOADED_OBJECTS with LD_TRACE_PRELINKING so mtrace could record executable address position. To provide the same information, LD_TRACE_LOADED_OBJECTS is extended where a value or '2' also prints the executable address as well. It avoid adding another loader environment variable to be used solely for mtrace. The vDSO will be printed as a default library (with '=>' pointing the same name), which is ok since both mtrace and ldd already handles it. The mtrace script is changed to also parse the new format. To correctly support PIE and non-PIE executables, both the default mtrace address and the one calculated as used (it fixes mtrace for non-PIE exectuable as for BZ#22716 for PIE). Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* elf: Remove prelink supportAdhemerval Zanella2022-02-1010-605/+53
| | | | | | | | | | | | | Prelinked binaries and libraries still work, the dynamic tags DT_GNU_PRELINKED, DT_GNU_LIBLIST, DT_GNU_CONFLICT just ignored (meaning the process is reallocated as default). The loader environment variable TRACE_PRELINKING is also removed, since it used solely on prelink. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Linux: Consolidate auxiliary vector parsingFlorian Weimer2022-02-101-76/+4
| | | | | | | | | | | | | | | | | | | | And optimize it slightly. The large switch statement in _dl_sysdep_start can be replaced with a large array. This reduces source code and binary size. On i686-linux-gnu: Before: text data bss dec hex filename 7791 12 0 7803 1e7b elf/dl-sysdep.os After: text data bss dec hex filename 7135 12 0 7147 1beb elf/dl-sysdep.os Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Merge dl-sysdep.c into the Linux versionFlorian Weimer2022-02-101-350/+2
| | | | | | | The generic version is the de-facto Linux implementation. It requires an auxiliary vector, so Hurd does not use it. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* hppa: Fix bind-now audit (BZ #28857)Adhemerval Zanella2022-02-095-5/+10
| | | | | | | | | | | | | | | | | | | | | | | | | On hppa, a function pointer returned by la_symbind is actually a function descriptor has the plabel bit set (bit 30). This must be cleared to get the actual address of the descriptor. If the descriptor has been bound, the first word of the descriptor is the physical address of theA function, otherwise, the first word of the descriptor points to a trampoline in the PLT. This patch also adds a workaround on tests because on hppa (and it seems to be the only ABI I have see it), some shared library adds a dynamic PLT relocation to am empty symbol name: $ readelf -r elf/tst-audit25mod1.so [...] Relocation section '.rela.plt' at offset 0x464 contains 6 entries: Offset Info Type Sym.Value Sym. Name + Addend 00002008 00000081 R_PARISC_IPLT 508 [...] It breaks some assumptions on the test, where a symbol with an empty name ("") is passed on la_symbind. Checked on x86_64-linux-gnu and hppa-linux-gnu.
* elf: Replace tst-audit24bmod2.so with tst-audit24bmod2H.J. Lu2022-02-061-1/+1
| | | | | | | | Replace tst-audit24bmod2.so with tst-audit24bmod2 to silence: make[2]: Entering directory '/export/gnu/import/git/gitlab/x86-glibc/elf' Makefile:2201: warning: overriding recipe for target '/export/build/gnu/tools-build/glibc-gitlab/build-x86_64-linux/elf/tst-audit24bmod2.so' ../Makerules:765: warning: ignoring old recipe for target '/export/build/gnu/tools-build/glibc-gitlab/build-x86_64-linux/elf/tst-audit24bmod2.so'
* Fix elf/tst-audit25a with default bind now toolchainsSzabolcs Nagy2022-02-021-0/+1
| | | | | This test relies on lazy binding for the executable so request that explicitly in case the toolchain defaults to bind now.
* elf: Fix runtime linker auditing on aarch64 (BZ #26643)Ben Woodard2022-02-011-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The rtld audit support show two problems on aarch64: 1. _dl_runtime_resolve does not preserve x8, the indirect result location register, which might generate wrong result calls depending of the function signature. 2. The NEON Q registers pushed onto the stack by _dl_runtime_resolve were twice the size of D registers extracted from the stack frame by _dl_runtime_profile. While 2. might result in wrong information passed on the PLT tracing, 1. generates wrong runtime behaviour. The aarch64 rtld audit support is changed to: * Both La_aarch64_regs and La_aarch64_retval are expanded to include both x8 and the full sized NEON V registers, as defined by the ABI. * dl_runtime_profile needed to extract registers saved by _dl_runtime_resolve and put them into the new correctly sized La_aarch64_regs structure. * The LAV_CURRENT check is change to only accept new audit modules to avoid the undefined behavior of not save/restore x8. * Different than other architectures, audit modules older than LAV_CURRENT are rejected (both La_aarch64_regs and La_aarch64_retval changed their layout and there are no requirements to support multiple audit interface with the inherent aarch64 issues). * A new field is also reserved on both La_aarch64_regs and La_aarch64_retval to support variant pcs symbols. Similar to x86, a new La_aarch64_vector type to represent the NEON register is added on the La_aarch64_regs (so each type can be accessed directly). Since LAV_CURRENT was already bumped to support bind-now, there is no need to increase it again. Checked on aarch64-linux-gnu. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* elf: Issue la_symbind for bind-now (BZ #23734)Adhemerval Zanella2022-02-0128-37/+1322
| | | | | | | | | | | | | | | | | | | | | | | The audit symbind callback is not called for binaries built with -Wl,-z,now or when LD_BIND_NOW=1 is used, nor the PLT tracking callbacks (plt_enter and plt_exit) since this would change the expected program semantics (where no PLT is expected) and would have performance implications (such as for BZ#15533). LAV_CURRENT is also bumped to indicate the audit ABI change (where la_symbind flags are set by the loader to indicate no possible PLT trace). To handle powerpc64 ELFv1 function descriptor, _dl_audit_symbind requires to know whether bind-now is used so the symbol value is updated to function text segment instead of the OPD (for lazy binding this is done by PPC64_LOAD_FUNCPTR on _dl_runtime_resolve). Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, powerpc64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* elf: Fix initial-exec TLS access on audit modules (BZ #28096)Adhemerval Zanella2022-02-016-4/+167
| | | | | | | | | | | | | | | | | For audit modules and dependencies with initial-exec TLS, we can not set the initial TLS image on default loader initialization because it would already be set by the audit setup. However, subsequent thread creation would need to follow the default behaviour. This patch fixes it by setting l_auditing link_map field not only for the audit modules, but also for all its dependencies. This is used on _dl_allocate_tls_init to avoid the static TLS initialization at load time. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* elf: Add la_activity during application exitAdhemerval Zanella2022-02-015-0/+351
| | | | | | | | | | la_activity is not called during application exit, even though la_objclose is. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* elf: Add <dl-r_debug.h>H.J. Lu2022-01-312-25/+24
| | | | | | | | Add <dl-r_debug.h> to get the adddress of the r_debug structure after relocation and its offset before relocation from the PT_DYNAMIC segment to support DT_DEBUG, DT_MIPS_RLD_MAP_REL and DT_MIPS_RLD_MAP. Co-developed-by: Xi Ruoyao <xry111@mengyan1223.wang>
* Fix elf/loadfail test build dependenciesSzabolcs Nagy2022-01-281-1/+3
| | | | | | | | | | There was no direct or indirect make dependency on testobj3.so so the test could fail with /B/elf/loadfail: failed to load shared object: testobj3.so: cannot open shared object file: No such file or directory Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Fix glibc 2.34 ABI omission (missing GLIBC_2.34 in dynamic loader)Florian Weimer2022-01-273-0/+39
| | | | | | | | | | | | | The glibc 2.34 release really should have added a GLIBC_2.34 symbol to the dynamic loader. With it, we could move functions such as dlopen or pthread_key_create that work on process-global state into the dynamic loader (once we have fixed a longstanding issue with static linking). Without the GLIBC_2.34 symbol, yet another new symbol version would be needed because old glibc will fail to load binaries due to the missing symbol version in ld.so that newly linked programs will require. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* Guard tst-valgrind-smoke.out with run-built-testsMark Wielaard2022-01-261-0/+2
| | | | | | Prevent tst-valgrind-smoke from running when run-built-tests is not yes. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Replace tst-p_alignmod1-editX with a python scriptAdhemerval Zanella2022-01-264-190/+4
| | | | | | | | This avoid the cross-compiling breakage when the test should not run ($(run-built-tests) equal to no). Checked on x86_64-linux-gnu and i686-linux-gnu as well with a cross compile to aarch64-linux-gnu and powerpc64-linux-gnu.
* elf: Fix use-after-free in ldconfig [BZ #26779]Martin Sebor2022-01-251-1/+1
| | | | Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* elf: Add a test for PT_LOAD segments with invalid p_align [BZ #28688]H.J. Lu2022-01-244-0/+88
| | | | | | | Build tst-p_alignmod3.so with 256 byte page size and verify that it is rejected with a proper error message. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Add a test for PT_LOAD segments with p_align == 1 [BZ #28688]H.J. Lu2022-01-243-0/+67
| | | | | | | | Add tst-p_alignmod2-edit to edit the copy of tst-p_alignmod-base.so to set p_align of the first PT_LOAD segment to 1 and verify that the shared library can be loaded normally. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Add a test for PT_LOAD segments with mixed p_align [BZ #28676]H.J. Lu2022-01-246-0/+258
| | | | | | | | Add tst-p_alignmod1-edit to edit the copy of tst-p_alignmod-base.so to reduce p_align of the first PT_LOAD segment by half and verify that the shared library is mapped with the maximum p_align of all PT_LOAD segments. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Add and use link-test-modules-rpath-link [BZ #28455]H.J. Lu2022-01-243-0/+80
| | | | | | | | | | | | | DT_RUNPATH is only used to find the immediate dependencies of the executable or shared object containing the DT_RUNPATH entry: 1. Define link-test-modules-rpath-link if $(build-hardcoded-path-in-tests) is yes. 2. Use $(link-test-modules-rpath-link) in build-module-helper so that test modules can dlopen modules with DT_RUNPATH. 3. Add a test to show why link-test-modules-rpath-link is needed. This partially fixes BZ #28455.
* Add valgrind smoke testAlexandra Hájková2022-01-223-0/+102
| | | | | | | | | | Check if whether valgrind is available in the test environment. If not, skip the test. Run smoke tests with valgrind to verify dynamic loader. First, check if algrind works with the system ld.so in the test environment. Then run the actual test inside the test environment, using the just build ld.so and new libraries. Co-authored-by: Mark Wielaard <mark@klomp.org>
* elf: Properly align all PT_LOAD segments [BZ #28676]H.J. Lu2022-01-211-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linker may set p_align of a PT_LOAD segment larger than p_align of the first PT_LOAD segment to satisfy a section alignment: Elf file type is DYN (Shared object file) Entry point 0x0 There are 10 program headers, starting at offset 64 Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000 0x0000000000000834 0x0000000000000834 R E 0x1000 LOAD 0x0000000000000e00 0x0000000000001e00 0x0000000000001e00 0x0000000000000230 0x0000000000000230 RW 0x1000 LOAD 0x0000000000400000 0x0000000000400000 0x0000000000400000 0x0000000000000004 0x0000000000000008 RW 0x400000 ... Section to Segment mapping: Segment Sections... 00 .note.gnu.property .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .init .plt .plt.got .text .fini .rodata .eh_frame_hdr .eh_frame 01 .init_array .fini_array .data.rel.ro .dynamic .got .got.plt 02 .data .bss We should align the first PT_LOAD segment to the maximum p_align of all PT_LOAD segments, similar to the kernel commit: commit ce81bb256a224259ab686742a6284930cbe4f1fa Author: Chris Kennelly <ckennelly@google.com> Date: Thu Oct 15 20:12:32 2020 -0700 fs/binfmt_elf: use PT_LOAD p_align values for suitable start address This fixes BZ #28676. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Fix tst-align3Adhemerval Zanella2022-01-181-2/+3
| | | | | | The elf/tst-align3.c declares the function using a wrong prototype. Checked on aarch64-linux-gnu.
* elf: Move _dl_setup_hash to its own fileFlorian Weimer2022-01-183-45/+65
| | | | | | | | | And compile it with the early CFLAGS. _dl_setup_hash is called very early for the ld.so link map, so it should be compiled differently. Reviewed-by: Stefan Liebler <stli@linux.ibm.com> Tested-by: Stefan Liebler <stli@linux.ibm.com>
* elf: Reinstate tst-audit17Adhemerval Zanella2022-01-171-0/+1
| | | | | 9926f6e2eeb3 ("elf: Skip tst-auditlogmod-* if the linker doesn't support --depaudit [BZ #28 151]") dropped the test by mistake.
* elf: Fix 64 time_t support for installed statically binariesAdhemerval Zanella2022-01-175-36/+36
| | | | | | | | | | | | | | The usage of internal static symbol for statically linked binaries does not work correctly for objects built with -D_TIME_BITS=64, since the internal definition does not provide the expected aliases. This patch makes it to use the default stat functions instead (which uses the default 64 time_t alias and types). Checked on i686-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* Revert "elf: Fix 64 time_t support for installed statically binaries"Adhemerval Zanella2022-01-175-36/+36
| | | | This reverts commit 0b8e83eb1455f3c0332eeb1f96fbc262fbd054e0.
* elf/tst-dl_find_object: Disable subtests for non-contiguous maps (bug 28732)Florian Weimer2022-01-171-12/+17
| | | | Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf: Set l_contiguous to 1 for the main map in more casesFlorian Weimer2022-01-171-0/+25
| | | | | | | | | | | | | | | | | l_contiguous was not initialized at all for the main map and always 0. This commit adds code to check if the LOAD segments are adjacent to each other, and sets l_contiguous accordingly. This helps _dl_find_object because it is more efficient if the main mapping is contiguous. Note that not all (PIE or non-PIE) binaries are contiguous in this way because BFD ld creates executables with LOAD holes: ELF LOAD segments creating holes in the process image on GNU/Linux https://sourceware.org/pipermail/binutils/2022-January/119082.html https://sourceware.org/bugzilla/show_bug.cgi?id=28743 Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf: Introduce rtld_setup_main_mapFlorian Weimer2022-01-171-144/+159
| | | | | | | This function collects most of the processing needed to initialize the link map for the main executable. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf tst-dl_find_object: Fix typoSamuel Thibault2022-01-151-1/+1
| | | | mod1 was xdlclose()d a few lines above.
* Add --with-rtld-early-cflags configure optionFlorian Weimer2022-01-141-0/+8
| | | | | Reviewed-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* elf: Split dl-printf.c from dl-misc.cFlorian Weimer2022-01-143-277/+297
| | | | | | | This allows to use different compiler flags for the diagnostics code. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf/Makefile: Reflow and sort most variable assignmentsFlorian Weimer2022-01-141-102/+318
| | | | Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf: Fix 64 time_t support for installed statically binariesAdhemerval Zanella2022-01-125-36/+36
| | | | | | | | | | | The usage of internal static symbol for statically linked binaries does not work correctly for objects built with -D_TIME_BITS=64, since the internal definition does not provide the expected aliases. This patch makes it to use the default stat functions instead (which uses the default 64 time_t alias and types). Checked on i686-linux-gnu.
* elf: Simplify software TM implementation in _dl_find_objectFlorian Weimer2022-01-101-36/+20
| | | | | | | | | | | | | With the current set of fences, the version update at the start of the TM write operation is redundant, and the version update at the end does not need to use an atomic read-modify-write operation. Also use relaxed MO stores during the dlclose update, and skip any version changes there. Suggested-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* elf: Fix fences in _dl_find_object_update (bug 28745)Florian Weimer2022-01-073-77/+133
| | | | | | | | | | | | | | | | | | | | | | As explained in Hans Boehm, Can Seqlocks Get Along with Programming Language Memory Models?, an acquire fence is needed in _dlfo_read_success. The lack of a fence resulted in an observable bug on powerpc64le compile-time load reordering. The fence in _dlfo_mappings_begin_update has been reordered, turning the fence/store sequence into a release MO store equivalent. Relaxed MO loads are used on the reader side, and relaxed MO stores on the writer side for the shared data, to avoid formal data races. This is just to be conservative; it should not actually be necessary given how the data is used. This commit also fixes the test run time. The intent was to run it for 3 seconds, but 0.3 seconds was enough to uncover the bug very occasionally (while 3 seconds did not reliably show the bug on every test run). Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* elf: Add reloc for OpenRISCStafford Horne2022-01-051-0/+37
| | | | Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Add a comment after trailing backslashesH.J. Lu2022-01-041-0/+4
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* elf: Also try DT_RUNPATH for LD_AUDIT dlopen [BZ #28455]H.J. Lu2022-01-043-3/+24
| | | | | | | | | | | DT_RUNPATH is only used to find the immediate dependencies of the executable or shared object containing the DT_RUNPATH entry. Update LD_AUDIT dlopen call to try the DT_RUNPATH entry of the executable. Add tst-audit14a, which is copied from tst-audit14, to DT_RUNPATH and build tst-audit14 with -Wl,--disable-new-dtags to test DT_RPATH. This partially fixes BZ #28455.
* elf: Fix tst-linkall-static link when pthread is not in libcSamuel Thibault2022-01-041-0/+4
| | | | In that case we want to link in libanl.a, thus providing getaddrinfo_a.
* elf: Sort tests and modules-namesH.J. Lu2022-01-031-147/+405
| | | | Sort tests and modules-names to reduce future conflicts.
* Remove stale reference to libanl.aAdhemerval Zanella2022-01-031-1/+0
| | | | | Since dbb949f53d4 ("resolv: Move libanl into libc (if libpthread is in libc)") libanl.a is empty, so linking against it no longer necessary.
* elf: Add <dl-debug.h>H.J. Lu2022-01-032-18/+6
| | | | | | | Add <dl-debug.h> to setup debugging entry in PT_DYNAMIC segment to support DT_DEBUG, DT_MIPS_RLD_MAP_REL and DT_MIPS_RLD_MAP. Tested on x86-64, x32 and i686 as well as with build-many-glibcs.py.
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