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* benchtests: Improve bench-strrchrNoah Goldstein2022-04-221-44/+82
| | | | | | | | | 1. Use json-lib for printing results. 2. Expose all parameters (before pos, seek_char, and max_char where not printed). 3. Add benchmarks that test multiple occurence of seek_char in the string. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86-64: Fix SSE2 memcmp and SSSE3 memmove for x32H.J. Lu2022-04-222-0/+8
| | | | | | | | | | | | | | | | Clear the upper 32 bits in RDX (memory size) for x32 to fix FAIL: string/tst-size_t-memcmp FAIL: string/tst-size_t-memcmp-2 FAIL: string/tst-size_t-memcpy FAIL: wcsmbs/tst-size_t-wmemcmp on x32 introduced by 8804157ad9 x86: Optimize memcmp SSE2 in memcmp.S 26b2478322 x86: Reduce code size of mem{move|pcpy|cpy}-ssse3 Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
* Default to --with-default-link=no (bug 25812)Florian Weimer2022-04-227-118/+190
| | | | | | | | | This is necessary to place the libio vtables into the RELRO segment. New tests elf/tst-relro-ldso and elf/tst-relro-libc are added to verify that this is what actually happens. The new tests fail on ia64 due to lack of (default) RELRO support inbutils, so they are XFAILed there.
* scripts: Add glibcelf.py moduleFlorian Weimer2022-04-223-0/+1402
| | | | | | | | | | | | | | | | Hopefully, this will lead to tests that are easier to maintain. The current approach of parsing readelf -W output using regular expressions is not necessarily easier than parsing the ELF data directly. This module is still somewhat incomplete (e.g., coverage of relocation types and versioning information is missing), but it is sufficient to perform basic symbol analysis or program header analysis. The EM_* mapping for architecture-specific constant classes (e.g., SttX86_64) is not yet implemented. The classes are defined for the benefit of elf/tst-glibcelf.py. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Add locale for syr_SYEmil Soleyman-Zomalan2022-04-214-0/+230
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* elf: Move elf_dynamic_do_Rel RTLD_BOOTSTRAP branches outsideFangrui Song2022-04-201-21/+28
| | | | | | | | | | | elf_dynamic_do_Rel checks RTLD_BOOTSTRAP in several #ifdef branches. Create an outside RTLD_BOOTSTRAP branch to simplify reasoning about the function at the cost of a few duplicate lines. Since dl_naudit is zero in RTLD_BOOTSTRAP code, the RTLD_BOOTSTRAP branch can avoid _dl_audit_symbind calls to decrease code size. Reviewed-by: Adheemrval Zanella <adhemerval.zanella@linaro.org>
* m68k: Handle fewer relocations for RTLD_BOOTSTRAP (#BZ29071)Fangrui Song2022-04-201-6/+6
| | | | | | | | | | | | | | | | | m68k is a non-PI_STATIC_AND_HIDDEN arch which uses a GOT relocation when loading the address of a jump table. The GOT load may be reordered before processing R_68K_RELATIVE relocations, leading to an unrelocated/incorrect jump table, which will cause a crash. The foolproof approach is to add an optimization barrier (e.g. calling an non-inlinable function after relative relocations are resolved). That is non-trivial given the current code structure, so just use the simple approach to avoid the jump table: handle only the essential reloctions for RTLD_BOOTSTRAP code. This is based on Andreas Schwab's patch and fixed ld.so crash on m68k. Reviewed-by: Adheemrval Zanella <adhemerval.zanella@linaro.org>
* nptl: Fix pthread_cancel cancelhandling atomic operationsAdhemerval Zanella2022-04-201-1/+2
| | | | | | | | The 404656009b reversion did not setup the atomic loop to set the cancel bits correctly. The fix is essentially what pthread_cancel did prior 26cfbb7162ad. Checked on x86_64-linux-gnu and aarch64-linux-gnu.
* x86: Fix missing __wmemcmp def for disable-multiarch buildNoah Goldstein2022-04-192-8/+6
| | | | | | | | | | | | | | | | commit 8804157ad9da39631703b92315460808eac86b0c Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Fri Apr 15 12:27:59 2022 -0500 x86: Optimize memcmp SSE2 in memcmp.S Only defined wmemcmp and missed __wmemcmp. This commit fixes that by defining __wmemcmp and setting wmemcmp as a weak alias to __wmemcmp. Both multiarch and disable-multiarch builds succeed and full xchecks pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* elf: Remove __libc_init_secureFangrui Song2022-04-198-99/+0
| | | | | | | | | | | | | | After 73fc4e28b9464f0e13edc719a5372839970e7ddb, __libc_enable_secure_decided is always 0 and a statically linked executable may overwrite __libc_enable_secure without considering AT_SECURE. The __libc_enable_secure has been correctly initialized in _dl_aux_init, so just remove __libc_enable_secure_decided and __libc_init_secure. This allows us to remove some startup_get*id functions from 22b79ed7f413cd980a7af0cf258da5bf82b6d5e5. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* mips: Fix mips64n32 64 bit time_t stat support (BZ#29069)=Joshua Kinard2022-04-181-15/+23
| | | | | Add missing support initially added by 4e8521333bea6e89fcef1020 (which missed n32 stat).
* x86: Cleanup page cross code in memcmp-avx2-movbe.SNoah Goldstein2022-04-151-37/+61
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Old code was both inefficient and wasted code size. New code (-62 bytes) and comparable or better performance in the page cross case. geometric_mean(N=20) of page cross cases New / Original: 0.960 size, align0, align1, ret, New Time/Old Time 1, 4095, 0, 0, 1.001 1, 4095, 0, 1, 0.999 1, 4095, 0, -1, 1.0 2, 4094, 0, 0, 1.0 2, 4094, 0, 1, 1.0 2, 4094, 0, -1, 1.0 3, 4093, 0, 0, 1.0 3, 4093, 0, 1, 1.0 3, 4093, 0, -1, 1.0 4, 4092, 0, 0, 0.987 4, 4092, 0, 1, 1.0 4, 4092, 0, -1, 1.0 5, 4091, 0, 0, 0.984 5, 4091, 0, 1, 1.002 5, 4091, 0, -1, 1.005 6, 4090, 0, 0, 0.993 6, 4090, 0, 1, 1.001 6, 4090, 0, -1, 1.003 7, 4089, 0, 0, 0.991 7, 4089, 0, 1, 1.0 7, 4089, 0, -1, 1.001 8, 4088, 0, 0, 0.875 8, 4088, 0, 1, 0.881 8, 4088, 0, -1, 0.888 9, 4087, 0, 0, 0.872 9, 4087, 0, 1, 0.879 9, 4087, 0, -1, 0.883 10, 4086, 0, 0, 0.878 10, 4086, 0, 1, 0.886 10, 4086, 0, -1, 0.873 11, 4085, 0, 0, 0.878 11, 4085, 0, 1, 0.881 11, 4085, 0, -1, 0.879 12, 4084, 0, 0, 0.873 12, 4084, 0, 1, 0.889 12, 4084, 0, -1, 0.875 13, 4083, 0, 0, 0.873 13, 4083, 0, 1, 0.863 13, 4083, 0, -1, 0.863 14, 4082, 0, 0, 0.838 14, 4082, 0, 1, 0.869 14, 4082, 0, -1, 0.877 15, 4081, 0, 0, 0.841 15, 4081, 0, 1, 0.869 15, 4081, 0, -1, 0.876 16, 4080, 0, 0, 0.988 16, 4080, 0, 1, 0.99 16, 4080, 0, -1, 0.989 17, 4079, 0, 0, 0.978 17, 4079, 0, 1, 0.981 17, 4079, 0, -1, 0.98 18, 4078, 0, 0, 0.981 18, 4078, 0, 1, 0.98 18, 4078, 0, -1, 0.985 19, 4077, 0, 0, 0.977 19, 4077, 0, 1, 0.979 19, 4077, 0, -1, 0.986 20, 4076, 0, 0, 0.977 20, 4076, 0, 1, 0.986 20, 4076, 0, -1, 0.984 21, 4075, 0, 0, 0.977 21, 4075, 0, 1, 0.983 21, 4075, 0, -1, 0.988 22, 4074, 0, 0, 0.983 22, 4074, 0, 1, 0.994 22, 4074, 0, -1, 0.993 23, 4073, 0, 0, 0.98 23, 4073, 0, 1, 0.992 23, 4073, 0, -1, 0.995 24, 4072, 0, 0, 0.989 24, 4072, 0, 1, 0.989 24, 4072, 0, -1, 0.991 25, 4071, 0, 0, 0.99 25, 4071, 0, 1, 0.999 25, 4071, 0, -1, 0.996 26, 4070, 0, 0, 0.993 26, 4070, 0, 1, 0.995 26, 4070, 0, -1, 0.998 27, 4069, 0, 0, 0.993 27, 4069, 0, 1, 0.999 27, 4069, 0, -1, 1.0 28, 4068, 0, 0, 0.997 28, 4068, 0, 1, 1.0 28, 4068, 0, -1, 0.999 29, 4067, 0, 0, 0.996 29, 4067, 0, 1, 0.999 29, 4067, 0, -1, 0.999 30, 4066, 0, 0, 0.991 30, 4066, 0, 1, 1.001 30, 4066, 0, -1, 0.999 31, 4065, 0, 0, 0.988 31, 4065, 0, 1, 0.998 31, 4065, 0, -1, 0.998 Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86: Remove memcmp-sse4.SNoah Goldstein2022-04-154-813/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Code didn't actually use any sse4 instructions since `ptest` was removed in: commit 2f9062d7171850451e6044ef78d91ff8c017b9c0 Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Wed Nov 10 16:18:56 2021 -0600 x86: Shrink memcmp-sse4.S code size The new memcmp-sse2 implementation is also faster. geometric_mean(N=20) of page cross cases SSE2 / SSE4: 0.905 Note there are two regressions preferring SSE2 for Size = 1 and Size = 65. Size = 1: size, align0, align1, ret, New Time/Old Time 1, 1, 1, 0, 1.2 1, 1, 1, 1, 1.197 1, 1, 1, -1, 1.2 This is intentional. Size == 1 is significantly less hot based on profiles of GCC11 and Python3 than sizes [4, 8] (which is made hotter). Python3 Size = 1 -> 13.64% Python3 Size = [4, 8] -> 60.92% GCC11 Size = 1 -> 1.29% GCC11 Size = [4, 8] -> 33.86% size, align0, align1, ret, New Time/Old Time 4, 4, 4, 0, 0.622 4, 4, 4, 1, 0.797 4, 4, 4, -1, 0.805 5, 5, 5, 0, 0.623 5, 5, 5, 1, 0.777 5, 5, 5, -1, 0.802 6, 6, 6, 0, 0.625 6, 6, 6, 1, 0.813 6, 6, 6, -1, 0.788 7, 7, 7, 0, 0.625 7, 7, 7, 1, 0.799 7, 7, 7, -1, 0.795 8, 8, 8, 0, 0.625 8, 8, 8, 1, 0.848 8, 8, 8, -1, 0.914 9, 9, 9, 0, 0.625 Size = 65: size, align0, align1, ret, New Time/Old Time 65, 0, 0, 0, 1.103 65, 0, 0, 1, 1.216 65, 0, 0, -1, 1.227 65, 65, 0, 0, 1.091 65, 0, 65, 1, 1.19 65, 65, 65, -1, 1.215 This is because A) the checks in range [65, 96] are now unrolled 2x and B) because smaller values <= 16 are now given a hotter path. By contrast the SSE4 version has a branch for Size = 80. The unrolled version has get better performance for returns which need both comparisons. size, align0, align1, ret, New Time/Old Time 128, 4, 8, 0, 0.858 128, 4, 8, 1, 0.879 128, 4, 8, -1, 0.888 As well, out of microbenchmark environments that are not full predictable the branch will have a real-cost. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86: Optimize memcmp SSE2 in memcmp.SNoah Goldstein2022-04-158-376/+575
| | | | | | | | New code save size (-303 bytes) and has significantly better performance. geometric_mean(N=20) of page cross cases New / Original: 0.634 Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* misc: Use 64 bit time_t interfaces on syslogAdhemerval Zanella2022-04-151-8/+27
| | | | | | | | It also handles the highly unlikely case where localtime might return NULL, in this case only the PRI is set to hopefully instruct the relay to get eh TIMESTAMP (as defined by the RFC). Checked on x86_64-linux-gnu and i686-linux-gnu.
* misc: syslog: Move SYSLOG_NAME to USE_MISC (BZ #16355)Adhemerval Zanella2022-04-151-2/+2
| | | | | | | | | There is no easy solution as described on first comment in bug report, and some code (like busybox) assumes facilitynames existance when SYSLOG_NAMES is defined (so we can't just remove it as suggested in comment #2). So use the easier solution and guard it with __USE_MISC.
* misc: syslog: Use fixed-sized buffer and remove memstreamAdhemerval Zanella2022-04-151-34/+52
| | | | | | | | | | | A fixed-sized buffer is used instead of memstream for messages up to 1024 bytes to avoid the potential BUFSIZ (8K) malloc and free for each syslog call. Also, since the buffer size is know, memstream is replaced with a malloced buffer for larger messages. Checked on x86_64-linux-gnu.
* misc: syslog: Simplify implementationAdhemerval Zanella2022-04-151-69/+26
| | | | | | | | Use a temporary buffer for strftime instead of using internal libio members, simplify fprintf call on the memstream and memory allocation, use %b instead of %h, use dprintf instead of writev for LOG_PERROR. Checked on x86_64-linux-gnu and i686-linux-gnu.
* misc: syslog: Fix indentation and styleAdhemerval Zanella2022-04-151-251/+234
| | | | And also clenaup the headers, no semantic changes.
* misc: Add syslog testAdhemerval Zanella2022-04-152-0/+475
| | | | | | | | | | | | | | | | The test cover: - All possible priorities and facilities through TCP and UDP. - Same syslog tests for vsyslog. - Some openlog/syslog/close combinations. - openlog with LOG_CONS, LOG_PERROR, and LOG_PID. Internally is done with a test-container where the main process mimics the syslog server interface. The test does not cover multithread and async-signal usage. Checked on x86_64-linux-gnu.
* support: Add xmkfifoAdhemerval Zanella2022-04-153-0/+31
| | | | Wrapper support mkfifo.
* stdio: Split __get_errname definition from errlist.cAdhemerval Zanella2022-04-154-36/+85
| | | | | | | | | | | | | | | | | The loader does not need to pull all __get_errlist definitions and its size is decreased: Before: $ size elf/ld.so text data bss dec hex filename 197774 11024 456 209254 33166 elf/ld.so After: $ size elf/ld.so text data bss dec hex filename 191510 9936 456 201902 314ae elf/ld.so Checked on x86_64-linux-gnu.
* x86: Reduce code size of mem{move|pcpy|cpy}-ssse3Noah Goldstein2022-04-143-3156/+380
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The goal is to remove most SSSE3 function as SSE4, AVX2, and EVEX are generally preferable. memcpy/memmove is one exception where avoiding unaligned loads with `palignr` is important for some targets. This commit replaces memmove-ssse3 with a better optimized are lower code footprint verion. As well it aliases memcpy to memmove. Aside from this function all other SSSE3 functions should be safe to remove. The performance is not changed drastically although shows overall improvements without any major regressions or gains. bench-memcpy geometric_mean(N=50) New / Original: 0.957 bench-memcpy-random geometric_mean(N=50) New / Original: 0.912 bench-memcpy-large geometric_mean(N=50) New / Original: 0.892 Benchmarks where run on Zhaoxin KX-6840@2000MHz See attached numbers for all results. More important this saves 7246 bytes of code size in memmove an additional 10741 bytes by reusing memmove code for memcpy (total 17987 bytes saves). As well an additional 896 bytes of rodata for the jump table entries.
* x86: Remove mem{move|cpy}-ssse3-backNoah Goldstein2022-04-145-3212/+6
| | | | | | | With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer SSSE3. As a result it is no longer worth it to keep the SSSE3 versions given the code size cost. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86: Remove str{p}{n}cpy-ssse3Noah Goldstein2022-04-146-3572/+0
| | | | | | | With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer SSSE3. As a result it is no longer worth it to keep the SSSE3 versions given the code size cost. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86: Remove str{n}cat-ssse3Noah Goldstein2022-04-145-879/+0
| | | | | | | With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer SSSE3. As a result it is no longer worth it to keep the SSSE3 versions given the code size cost. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86: Remove str{n}{case}cmp-ssse3Noah Goldstein2022-04-1410-202/+30
| | | | | | | With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer SSSE3. As a result it is no longer worth it to keep the SSSE3 versions given the code size cost. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* x86: Remove {w}memcmp-ssse3Noah Goldstein2022-04-145-2006/+0
| | | | | | | With SSE2, SSE4.1, AVX2, and EVEX versions very few targets prefer SSSE3. As a result it is no longer worth it to keep the SSSE3 versions given the code size cost. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)Adhemerval Zanella2022-04-1415-91/+482
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some Linux interfaces never restart after being interrupted by a signal handler, regardless of the use of SA_RESTART [1]. It means that for pthread cancellation, if the target thread disables cancellation with pthread_setcancelstate and calls such interfaces (like poll or select), it should not see spurious EINTR failures due the internal SIGCANCEL. However recent changes made pthread_cancel to always sent the internal signal, regardless of the target thread cancellation status or type. To fix it, the previous semantic is restored, where the cancel signal is only sent if the target thread has cancelation enabled in asynchronous mode. The cancel state and cancel type is moved back to cancelhandling and atomic operation are used to synchronize between threads. The patch essentially revert the following commits: 8c1c0aae20 nptl: Move cancel type out of cancelhandling 2b51742531 nptl: Move cancel state out of cancelhandling 26cfbb7162 nptl: Remove CANCELING_BITMASK However I changed the atomic operation to follow the internal C11 semantic and removed the MACRO usage, it simplifies a bit the resulting code (and removes another usage of the old atomic macros). Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, and powerpc64-linux-gnu. [1] https://man7.org/linux/man-pages/man7/signal.7.html Reviewed-by: Florian Weimer <fweimer@redhat.com> Tested-by: Aurelien Jarno <aurelien@aurel32.net>
* S390: Add new s390 platform z16.Stefan Liebler2022-04-148-10/+61
| | | | | | | | | | | | | | The new IBM z16 is added to platform string array. The macro _DL_PLATFORMS_COUNT is incremented. _dl_hwcaps_subdir is extended by "z16" if HWCAP_S390_VXRS_PDE2 is set. HWCAP_S390_NNPA is not tested in _dl_hwcaps_subdirs_active as those instructions may be replaced or removed in future. tst-glibc-hwcaps.c is extended in order to test z16 via new marker5. A fatal glibc error is dumped if glibc was build with architecture level set for z16, but run on an older machine. (See dl-hwcap-check.h)
* Replace {u}int_fast{16|32} with {u}int32_tNoah Goldstein2022-04-1319-34/+34
| | | | | | | | | On 32-bit machines this has no affect. On 64-bit machines {u}int_fast{16|32} are set as {u}int64_t which is often not ideal. Particularly x86_64 this change both saves code size and may save instruction cost. Full xcheck passes on x86_64.
* stdlib: Reflow and sort most variable assignmentsAdhemerval Zanella2022-04-131-63/+227
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* elf: Fix memory leak in _dl_find_object_update (bug 29062)Florian Weimer2022-04-131-2/+3
| | | | | | | | The count can be zero if an object has already been loaded as an indirect dependency (so that l_searchlist.r_list in its link map is still NULL) is promoted to global scope via RTLD_GLOBAL. Fixes commit 5d28a8962dc ("elf: Add _dl_find_object function").
* hurd: Define ELIBEXECSamuel Thibault2022-04-122-5/+7
| | | | So we can implement it in the exec server.
* hurd: Fix arbitrary error codeSamuel Thibault2022-04-121-1/+1
| | | | ELIBBAD is Linux-specific.
* NEWS: Move PLT tracking slowdown to glibc 2.35.Carlos O'Donell2022-04-121-3/+3
| | | | | | | In commit 063f9ba220f434c7f30dd65c4cff17c0c458a7cf the NEWS section was accidentally added to the glibc 2.34 NEWS section. The NEWS entry should have been added to glibc 2.35 which contained the committed fix. This moves the NEWS entry to correct section.
* Remove _dl_skip_args_internal declarationSzabolcs Nagy2022-04-121-5/+0
| | | | | | It does not seem to be used. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* test-container: Fix "unused code" warnings on HURDDJ Delorie2022-04-121-0/+6
| | | | | | | | | Comment out bits of code that are only used when we *have* pid namespaces, to avoid "unused code" warnings. Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Message-Id: <xno817tnds.fsf@greed.delorie.com>
* Add .clang-format style fileNoah Goldstein2022-04-111-0/+156
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Went with version >= 11.0 since it covers most of the major features and should be pretty universally accessibly. There are some issues: 1. indention of preprocessor directives: Unfortunately there doesn't appear to be a switch for a seperate 'IndentWidth' for preprocessor directives vs. normal code so we are stuck either not indenting the directives or over-indenting them. i.e: Desired: ``` #ifndef A # define B #endif ``` Options: ``` #ifndef A # define B /* Two spaces instead of one. */ #endif #ifndef C #define D /* No spaces. */ #endif ``` Chose to over-indent as it generally seems easier to script halving all pre-processor indentations than counting the nested depth and indenting from scratch. 2. concatenation of lines missing semi-colons: Throughout glibc there are macros used to setup aliasing that are outside of functions and don't end in semi-colons i.e: ``` libc_hidden_def (__pthread_self) weak_alias (__pthread_self, pthread_self) ``` clang-format reformats lines like these to: ``` libc_hidden_def (__pthread_self) weak_alias (__pthread_self, pthread_self) ``` which is generally undesirable. Other than those two big concerns there are certainly some questions diffs but for the most part it creates a easy to read and consistent style. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* manual: Avoid name collision in libm ULP table [BZ #28956]Tom Coldrick2022-04-112-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | The 32-bit and 64-bit variants of RISC-V share the same name - "RISC-V" - when generating the libm error table for the info pages. This collision, and the way how the table is generated, mean that the values in the final table for "RISC-V" may be either for the 32- or 64-bit variant, with no indication as to which. As an additional side-effect, this makes the build non-reproducible, as the error table generated is dependent upon the host filesystem implementation. To solve this issue, the libm-test-ulps-name files for both variants have been modified to include their word size, so as to remove the collision and provide more accurate information in the table. An alternative proposed was to merge the two variants' ULP values into a single file, but this would mean that information about error values is lost, as the two variants are not identical. Some differences are considerable, notably the values for the exp() function are large. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* powerpc: Relocate stinfo->mainAlan Modra2022-04-102-2/+19
| | | | | | | | | | | | | | start_addresses in sysdeps/powerpc/powerpc64/start.S is historical baggage that should disappear. Until someone does that, relocating stinfo->main by hand is one solution to the fact that the field may be unrelocated at the time it is accessed. This is similar to what is done for dynamic tags via the D_PTR macro. stinfo->init and stinfo->fini are zero in both powerpc64/start.S and powerpc32/start.S, so make it a little more obvious they are unused by passing NULLs to LIBC_START_MAIN. The makefile change is needed to pick up elf/dl-static-tls.h from dl-machine.h. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc64: Set up thread register for _dl_relocate_static_pieAlan Modra2022-04-106-11/+33
| | | | | | | | | | | | | | | | | libgcc ifunc resolvers that access hwcap via a field in the tcb can't be called until the thread pointer is set up. Other ifunc resolvers might need access to at_platform. This patch sets up a fake thread pointer early to a copy of tcbhead_t. hwcapinfo.c already had local variables for hwcap and at_platform, replace them with an entire tcbhead_t. It's not that large and this way we easily ensure hwcap and at_platform are at the same relative offsets as they are in the real thread block. The patch also conditionally disables part of tst-tlsifunc-static, "bar address read from IFUNC resolver is incorrect". We can't get a proper address for a thread variable before glibc initialises tls. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* powerpc64: Use medium model toc accesses throughoutAlan Modra2022-04-106-15/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The PowerPC64 linker edits medium model toc-indirect code to toc-pointer relative: addis r9,r2,tc_entry_for_var@toc@ha ld r9,tc_entry_for_var@toc@l(r9) becomes addis r9,r2,(var-.TOC.)@ha addi r9,r9,(var-.TOC.)@l when "var" is known to be local to the binary. This isn't done for small-model toc-indirect code, because "var" is almost guaranteed to be too far away from .TOC. for a 16-bit signed offset. And, because the analysis of which .toc entry can be removed becomes much more complicated in objects that mix code models, they aren't removed if any small-model toc sequence appears in an object file. Unfortunately, glibc's build of ld.so smashes the needed objects together in a ld -r linking stage. This means the GOT/TOC is left with a whole lot of relative relocations which is untidy, but in itself is not a serious problem. However, static-pie on powerpc64 bombs due to a segfault caused by one of the small-model accesses before _dl_relocate_static_pie. (The very first one in rcrt1.o passing start_addresses in r8 to __libc_start_main.) So this patch makes all the toc/got accesses in assembly medium code model, and a couple of functions hidden. By itself this is not enough to give us working static-pie, but it is useful in isolation to enable better linker optimisation. There's a serious problem in libgcc too. libgcc ifuncs access the AT_HWCAP words stored in the tcb with an offset from the thread pointer (r13), but r13 isn't set at the time _dl_relocate_static_pie. A followup patch will fix that. Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
* linux: Constify rfv variable in dl_vdso_vsymAlan Modra2022-04-101-1/+1
| | | | | | | | Compilers may decide to put the rfv variable in .data rather than on the stack. It's slightly better to put it in .data.rel.ro.local instead. Regardles of that, making it const may enable further optimisations. Found when examining relative relocations (GOT ones in particular) as part of enabling static-pie for PowerPC64.
* string: Replace outdated comments in strlen().Ricardo Bittencourt2022-04-091-11/+5
| | | | | | | | | | | | | | | | | | | | | | | Copyright The GNU Toolchain Authors. The comments on strlen() don't match what the actual code does. They describe an older algorithm which is no longer in use. This change replace the old comments with new ones describing the algorithm used. I am a first time contributor, and I believe there is no need for copyright assignment, since the file changed is not in the shared source files list. This patch only changes comments, but for safety I have run the tests in my x64 ubuntu machine, with the following results: Summary of test results: 5051 PASS 80 UNSUPPORTED 16 XFAIL 6 XPASS Signed-off-by: Ricardo Bittencourt <bluepenguin@gmail.com>
* S390: Fix elf/tst-audit25[ab]Stefan Liebler2022-04-071-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | If glibc is configured with --disable-default-pie and build on s390 with -O3, the tests elf/tst-audit25a and elf/tst-audit25b are failing as there are additional la_symbind lines for free and malloc. It turns out that those belong to the executable. In fact those are the PLT-stubs. Furthermore la_symbind is also called for calloc and realloc symbols, but those belong to libc. Those functions are not called at all, but dlsym'ed in elf/dl-minimal.c: __rtld_malloc_init_real (struct link_map *main_map) { ... void *new_calloc = lookup_malloc_symbol (main_map, "calloc", &version); void *new_free = lookup_malloc_symbol (main_map, "free", &version); void *new_malloc = lookup_malloc_symbol (main_map, "malloc", &version); void *new_realloc = lookup_malloc_symbol (main_map, "realloc", &version); ... } Therefore, this commit just ignored symbols with LA_SYMB_DLSYM flag. Reviewed-by: Adheemrval Zanella <adhemerval.zanella@linaro.org>
* sparc64: Remove fcopysign{f} implementationAdhemerval Zanella2022-04-077-135/+6
| | | | | | The builtin from generic code generates similar compliant sequence. Checked on sparc64-linux-gnu.
* alpha: Remove fcopysign{f} implementationAdhemerval Zanella2022-04-072-60/+0
| | | | The generic code already uses builtins.
* math: Use builtin for ldbl-96 copysignAdhemerval Zanella2022-04-071-7/+3
| | | | | | | All architectures that uses it (x86, ia64, m68k) implement the builtin. Checked on x86_64-linux-gnu and ia64-linux-gnu.
* ia64: Remove fcopysign{f} implementationAdhemerval Zanella2022-04-073-39/+0
| | | | | | The builtin used by generic code generates similar code. Checked on ia64-linux-gnu.
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-15 15:43:47 +0000