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2022-05-16x86: Add EVEX optimized str{n}casecmpNoah Goldstein
geometric_mean(N=40) of all benchmarks EVEX / SSE42: .621 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 84e7c46df4086873eae28a1fb87d2cf5388b1e16)
2022-05-16x86: Add AVX2 optimized str{n}casecmpNoah Goldstein
geometric_mean(N=40) of all benchmarks AVX2 / SSE42: .702 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit bbf81222343fed5cd704001a2ae0d86c71544151)
2022-05-16x86: Optimize str{n}casecmp TOLOWER logic in strcmp-sse42.SNoah Goldstein
Slightly faster method of doing TOLOWER that saves an instruction. Also replace the hard coded 5-byte no with .p2align 4. On builds with CET enabled this misaligned entry to strcasecmp. geometric_mean(N=40) of all benchmarks New / Original: .920 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit d154758e618ec9324f5d339c46db0aa27e8b1226)
2022-05-16x86: Optimize str{n}casecmp TOLOWER logic in strcmp.SNoah Goldstein
Slightly faster method of doing TOLOWER that saves an instruction. Also replace the hard coded 5-byte no with .p2align 4. On builds with CET enabled this misaligned entry to strcasecmp. geometric_mean(N=40) of all benchmarks New / Original: .894 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 670b54bc585ea4a94f3b2e9272ba44aa6b730b73)
2022-05-16x86: Remove strspn-sse2.S and use the generic implementationNoah Goldstein
The generic implementation is faster. geometric_mean(N=20) of all benchmarks New / Original: .710 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 9c8a6ad620b49a27120ecdd7049c26bf05900397)
2022-05-16x86: Remove strpbrk-sse2.S and use the generic implementationNoah Goldstein
The generic implementation is faster (see strcspn commit). All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 653358535280a599382cb6c77538a187dac6a87f)
2022-05-16x86: Remove strcspn-sse2.S and use the generic implementationNoah Goldstein
The generic implementation is faster. geometric_mean(N=20) of all benchmarks New / Original: .678 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit fe28e7d9d9535ebab4081d195c553b4fbf39d9ae)
2022-05-16x86: Optimize strspn in strspn-c.cNoah Goldstein
Use _mm_cmpeq_epi8 and _mm_movemask_epi8 to get strlen instead of _mm_cmpistri. Also change offset to unsigned to avoid unnecessary sign extensions. geometric_mean(N=20) of all benchmarks that dont fallback on sse2; New / Original: .901 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 412d10343168b05b8cf6c3683457cf9711d28046)
2022-05-16x86: Optimize strcspn and strpbrk in strcspn-c.cNoah Goldstein
Use _mm_cmpeq_epi8 and _mm_movemask_epi8 to get strlen instead of _mm_cmpistri. Also change offset to unsigned to avoid unnecessary sign extensions. geometric_mean(N=20) of all benchmarks that dont fallback on sse2/strlen; New / Original: .928 All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 30d627d477d7255345a4b713cf352ac32d644d61)
2022-05-16x86: Code cleanup in strchr-evex and comment justifying branchNoah Goldstein
Small code cleanup for size: -81 bytes. Add comment justifying using a branch to do NULL/non-null return. All string/memory tests pass and no regressions in benchtests. geometric_mean(N=20) of all benchmarks New / Original: .985 Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit ec285ea90415458225623ddc0492ae3f705af043)
2022-05-16x86: Code cleanup in strchr-avx2 and comment justifying branchNoah Goldstein
Small code cleanup for size: -53 bytes. Add comment justifying using a branch to do NULL/non-null return. All string/memory tests pass and no regressions in benchtests. geometric_mean(N=20) of all benchmarks Original / New: 1.00 Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit a6fbf4d51e9ba8063c4f8331564892ead9c67344)
2022-05-16x86_64: Remove bcopy optimizationsAdhemerval Zanella
The symbols is not present in current POSIX specification and compiler already generates memmove call. (cherry picked from commit bf92893a14ebc161b08b28acc24fa06ae6be19cb)
2022-05-16x86-64: Define __memcmpeq in ld.soH.J. Lu
Define __memcmpeq in ld.so so that compiler can generate __memcmpeq call when compiling for ld.so. (cherry picked from commit a5659cf27d3ce6101c1632715d18ab6321755340)
2022-05-16x86-64: Remove bzero weak alias in SS2 memsetH.J. Lu
commit 3d9f171bfb5325bd5f427e9fc386453358c6e840 Author: H.J. Lu <hjl.tools@gmail.com> Date: Mon Feb 7 05:55:15 2022 -0800 x86-64: Optimize bzero added the optimized bzero. Remove bzero weak alias in SS2 memset to avoid undefined __bzero in memset-sse2-unaligned-erms. (cherry picked from commit 0fb8800029d230b3711bf722b2a47db92d0e273f)
2022-05-16x86_64/multiarch: Sort sysdep_routines and put one entry per lineH.J. Lu
(cherry picked from commit c328d0152d4b14cca58407ec68143894c8863004)
2022-05-16x86: Improve L to support L(XXX_SYMBOL (YYY, ZZZ))H.J. Lu
(cherry picked from commit 1283948f236f209b7d3f44b69a42b96806fa6da0)
2022-05-16fortify: Ensure that __glibc_fortify condition is a constant [BZ #29141]Siddhesh Poyarekar
The fix c8ee1c85 introduced a -1 check for object size without also checking that object size is a constant. Because of this, the tree optimizer passes in gcc fail to fold away one of the branches in __glibc_fortify and trips on a spurious Wstringop-overflow. The warning itself is incorrect and the branch does go away eventually in DCE in the rtl passes in gcc, but the constant check is a helpful hint to simplify code early, so add it in. Resolves: BZ #29141 Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2022-05-11dlfcn: Implement the RTLD_DI_PHDR request type for dlinfoFlorian Weimer
The information is theoretically available via dl_iterate_phdr as well, but that approach is very slow if there are many shared objects. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@rehdat.com> (cherry picked from commit d056c212130280c0a54d9a4f72170ec621b70ce5)
2022-05-11manual: Document the dlinfo functionFlorian Weimer
Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@rehdat.com> (cherry picked from commit 93804a1ee084d4bdc620b2b9f91615c7da0fabe1)
2022-05-06NEWS: Add a bug fix entry for BZ #29109Adhemerval Zanella
2022-05-06linux: Fix posix_spawn return code if clone fails (BZ#29109)Adhemerval Zanella
The __clone_internal returns the error on errno. Checked on x86_64-linux-gnu. (cherry picked from commit 71e2a681f18f617ab962bf8a139bd86d4d440e22)
2022-05-04x86: Fix fallback for wcsncmp_avx2 in strcmp-avx2.S [BZ #28896]Noah Goldstein
Overflow case for __wcsncmp_avx2_rtm should be __wcscmp_avx2_rtm not __wcscmp_avx2. commit ddf0992cf57a93200e0c782e2a94d0733a5a0b87 Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Sun Jan 9 16:02:21 2022 -0600 x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ# 28755] Set the wrong fallback function for `__wcsncmp_avx2_rtm`. It was set to fallback on to `__wcscmp_avx2` instead of `__wcscmp_avx2_rtm` which can cause spurious aborts. This change will need to be backported. All string/memory tests pass. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit 9fef7039a7d04947bc89296ee0d187bc8d89b772)
2022-05-04x86: Fix bug in strncmp-evex and strncmp-avx2 [BZ #28895]Noah Goldstein
Logic can read before the start of `s1` / `s2` if both `s1` and `s2` are near the start of a page. To avoid having the result contimated by these comparisons the `strcmp` variants would mask off these comparisons. This was missing in the `strncmp` variants causing the bug. This commit adds the masking to `strncmp` so that out of range comparisons don't affect the result. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass as well a full xcheck on x86_64 linux. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit e108c02a5e23c8c88ce66d8705d4a24bb6b9a8bf)
2022-05-04x86: Set .text section in memset-vec-unaligned-ermsNoah Goldstein
commit 3d9f171bfb5325bd5f427e9fc386453358c6e840 Author: H.J. Lu <hjl.tools@gmail.com> Date: Mon Feb 7 05:55:15 2022 -0800 x86-64: Optimize bzero Remove setting the .text section for the code. This commit adds that back. (cherry picked from commit 7912236f4a597deb092650ca79f33504ddb4af28)
2022-05-04x86-64: Optimize bzeroH.J. Lu
memset with zero as the value to set is by far the majority value (99%+ for Python3 and GCC). bzero can be slightly more optimized for this case by using a zero-idiom xor for broadcasting the set value to a register (vector or GPR). Co-developed-by: Noah Goldstein <goldstein.w.n@gmail.com> (cherry picked from commit 3d9f171bfb5325bd5f427e9fc386453358c6e840)
2022-05-04x86: Remove SSSE3 instruction for broadcast in memset.S (SSE2 Only)Noah Goldstein
commit b62ace2740a106222e124cc86956448fa07abf4d Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Sun Feb 6 00:54:18 2022 -0600 x86: Improve vec generation in memset-vec-unaligned-erms.S Revert usage of 'pshufb' in broadcast logic as it is an SSSE3 instruction and memset.S is restricted to only SSE2 instructions. (cherry picked from commit 1b0c60f95bbe2eded80b2bb5be75c0e45b11cde1)
2022-05-04x86: Improve vec generation in memset-vec-unaligned-erms.SNoah Goldstein
No bug. Split vec generation into multiple steps. This allows the broadcast in AVX2 to use 'xmm' registers for the L(less_vec) case. This saves an expensive lane-cross instruction and removes the need for 'vzeroupper'. For SSE2 replace 2x 'punpck' instructions with zero-idiom 'pxor' for byte broadcast. Results for memset-avx2 small (geomean of N = 20 benchset runs). size, New Time, Old Time, New / Old 0, 4.100, 3.831, 0.934 1, 5.074, 4.399, 0.867 2, 4.433, 4.411, 0.995 4, 4.487, 4.415, 0.984 8, 4.454, 4.396, 0.987 16, 4.502, 4.443, 0.987 All relevant string/wcsmbs tests are passing. Reviewed-by: H.J. Lu <hjl.tools@gmail.com> (cherry picked from commit b62ace2740a106222e124cc86956448fa07abf4d)
2022-05-04x86-64: Fix strcmp-evex.SH.J. Lu
Change "movl %edx, %rdx" to "movl %edx, %edx" in: commit 8418eb3ff4b781d31c4ed5dc6c0bd7356bc45db9 Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Mon Jan 10 15:35:39 2022 -0600 x86: Optimize strcmp-evex.S (cherry picked from commit 0e0199a9e02ebe42e2b36958964d63f03573c382)
2022-05-04x86-64: Fix strcmp-avx2.SH.J. Lu
Change "movl %edx, %rdx" to "movl %edx, %edx" in: commit b77b06e0e296f1a2276c27a67e1d44f2cfa38d45 Author: Noah Goldstein <goldstein.w.n@gmail.com> Date: Mon Jan 10 15:35:38 2022 -0600 x86: Optimize strcmp-avx2.S (cherry picked from commit c15efd011cea3d8f0494269eb539583215a1feed)
2022-05-04x86: Optimize strcmp-evex.SNoah Goldstein
Optimization are primarily to the loop logic and how the page cross logic interacts with the loop. The page cross logic is at times more expensive for short strings near the end of a page but not crossing the page. This is done to retest the page cross conditions with a non-faulty check and to improve the logic for entering the loop afterwards. This is only particular cases, however, and is general made up for by more than 10x improvements on the transition from the page cross -> loop case. The non-page cross cases as well are nearly universally improved. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com> (cherry picked from commit 8418eb3ff4b781d31c4ed5dc6c0bd7356bc45db9)
2022-05-04x86: Optimize strcmp-avx2.SNoah Goldstein
Optimization are primarily to the loop logic and how the page cross logic interacts with the loop. The page cross logic is at times more expensive for short strings near the end of a page but not crossing the page. This is done to retest the page cross conditions with a non-faulty check and to improve the logic for entering the loop afterwards. This is only particular cases, however, and is general made up for by more than 10x improvements on the transition from the page cross -> loop case. The non-page cross cases are improved most for smaller sizes [0, 128] and go about even for (128, 4096]. The loop page cross logic is improved so some more significant speedup is seen there as well. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com> (cherry picked from commit b77b06e0e296f1a2276c27a67e1d44f2cfa38d45)
2022-05-04manual: Clarify that abbreviations of long options are allowedSiddhesh Poyarekar
The man page and code comments clearly state that abbreviations of long option names are recognized correctly as long as they are unique. Document this fact in the glibc manual as well. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Andreas Schwab <schwab@linux-m68k.org> (cherry picked from commit db1efe02c9f15affc3908d6ae73875b82898a489)
2022-05-03Add HWCAP2_AFP, HWCAP2_RPRES from Linux 5.17 to AArch64 bits/hwcap.hJoseph Myers
Add the new HWCAP2_AFP and HWCAP2_RPRES constants from Linux 5.17. Tested with build-many-glibcs.py for aarch64-linux-gnu. (cherry picked from commit 866c599182e87f116440b5d854f9e99533c48eb3)
2022-05-03Add SOL_MPTCP, SOL_MCTP from Linux 5.16 to bits/socket.hJoseph Myers
Linux 5.16 adds constants SOL_MPTCP and SOL_MCTP to the getsockopt / setsockopt levels; add these constants to bits/socket.h. Tested for x86_64. (cherry picked from commit fdc1ae67fef27eea1445bab4bdfe2f0fb3bc7aa1)
2022-05-03Update kernel version to 5.17 in tst-mman-consts.pyJoseph Myers
This patch updates the kernel version in the test tst-mman-consts.py to 5.17. (There are no new MAP_* constants covered by this test in 5.17 that need any other header changes.) Tested with build-many-glibcs.py. (cherry picked from commit 23808a422e6036accaba7236fd3b9a0d7ab7e8ee)
2022-05-03Update kernel version to 5.16 in tst-mman-consts.pyJoseph Myers
This patch updates the kernel version in the test tst-mman-consts.py to 5.16. (There are no new MAP_* constants covered by this test in 5.16 that need any other header changes.) Tested with build-many-glibcs.py. (cherry picked from commit 790a607e234aa10d4b977a1b80aebe8a2acac970)
2022-05-03Update syscall lists for Linux 5.17Joseph Myers
Linux 5.17 has one new syscall, set_mempolicy_home_node. Update syscall-names.list and regenerate the arch-syscall.h headers with build-many-glibcs.py update-syscalls. Tested with build-many-glibcs.py. (cherry picked from commit 8ef9196b26793830515402ea95aca2629f7721ec)
2022-04-28posix/glob.c: update from gnulibDJ Delorie
Copied from gnulib/lib/glob.c in order to fix rhbz 1982608 Also fixes swbz 25659 Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com> (cherry picked from commit 7c477b57a31487eda516db02b9e04f22d1a6e6af)
2022-04-28linux: Fix fchmodat with AT_SYMLINK_NOFOLLOW for 64 bit time_t (BZ#29097)Adhemerval Zanella
The AT_SYMLINK_NOFOLLOW emulation ues the default 32 bit stat internal calls, which fails with EOVERFLOW if the file constains timestamps beyond 2038. Checked on i686-linux-gnu. (cherry picked from commit 118a2aee07f64d605b6668cbe195c1f44eac6be6)
2022-04-27i386: Regenerate ulpsCarlos O'Donell
These failures were caught while building glibc master for Fedora Rawhide which is built with '-mtune=generic -msse2 -mfpmath=sse' using gcc 11.3 (gcc-11.3.1-2.fc35) on a Cascadelake Intel Xeon processor. (cherry picked from commit e465d97653311c3687aee49de782177353acfe86)
2022-04-27linux: Fix missing internal 64 bit time_t stat usageAdhemerval Zanella
These are two missing spots initially done by 52a5fe70a2c77935. Checked on i686-linux-gnu. (cherry picked from commit 834ddd0432f68d6dc85b6aac95065721af0d86e9)
2022-04-27elf: Fix DFS sorting algorithm for LD_TRACE_LOADED_OBJECTS with missing ↵Adhemerval Zanella
libraries (BZ #28868) On _dl_map_object the underlying file is not opened in trace mode (in other cases where the underlying file can't be opened, _dl_map_object quits with an error). If there any missing libraries being processed, they will not be considered on final nlist size passed on _dl_sort_maps later in the function. And it is then used by _dl_sort_maps_dfs on the stack allocated working maps: 222 /* Array to hold RPO sorting results, before we copy back to maps[]. */ 223 struct link_map *rpo[nmaps]; 224 225 /* The 'head' position during each DFS iteration. Note that we start at 226 one past the last element due to first-decrement-then-store (see the 227 bottom of above dfs_traversal() routine). */ 228 struct link_map **rpo_head = &rpo[nmaps]; However while transversing the 'l_initfini' on dfs_traversal it will still consider the l_faked maps and thus update rpo more times than the allocated working 'rpo', overflowing the stack object. As suggested in bugzilla, one option would be to avoid sorting the maps for trace mode. However I think ignoring l_faked object does make sense (there is one less constraint to call the sorting function), it allows a slight less stack usage for trace, and it is slight simpler solution. The tests does trigger the stack overflow, however I tried to make it more generic to check different scenarios or missing objects. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> (cherry picked from commit 3a0588ae48fb35384a6bd33f9b66403badfa1262)
2022-04-26scripts/glibcelf.py: Mark as UNSUPPORTED on Python 3.5 and earlierFlorian Weimer
enum.IntFlag and enum.EnumMeta._missing_ support are not part of earlier Python versions. (cherry picked from commit b571f3adffdcbed23f35ea39b0ca43809dbb4f5b)
2022-04-26dlfcn: Do not use rtld_active () to determine ld.so state (bug 29078)Florian Weimer
When audit modules are loaded, ld.so initialization is not yet complete, and rtld_active () returns false even though ld.so is mostly working. Instead, the static dlopen hook is used, but that does not work at all because this is not a static dlopen situation. Commit 466c1ea15f461edb8e3ffaf5d86d708876343bbf ("dlfcn: Rework static dlopen hooks") moved the hook pointer into _rtld_global_ro, which means that separate protection is not needed anymore and the hook pointer can be checked directly. The guard for disabling libio vtable hardening in _IO_vtable_check should stay for now. Fixes commit 8e1472d2c1e25e6eabc2059170731365f6d5b3d1 ("ld.so: Examine GLRO to detect inactive loader [BZ #20204]"). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> (cherry picked from commit 8dcb6d0af07fda3607b541857e4f3970a74ed55b)
2022-04-26INSTALL: Rephrase -with-default-link documentationFlorian Weimer
Reviewed-by: Carlos O'Donell <carlos@redhat.com> (cherry picked from commit c935789bdf40ba22b5698da869d3a4789797e09f)
2022-04-25misc: Fix rare fortify crash on wchar funcs. [BZ 29030]Joan Bruguera
If `__glibc_objsize (__o) == (size_t) -1` (i.e. `__o` is unknown size), fortify checks should pass, and `__whatever_alias` should be called. Previously, `__glibc_objsize (__o) == (size_t) -1` was explicitly checked, but on commit a643f60c53876b, this was moved into `__glibc_safe_or_unknown_len`. A comment says the -1 case should work as: "The -1 check is redundant because since it implies that __glibc_safe_len_cond is true.". But this fails when: * `__s > 1` * `__osz == -1` (i.e. unknown size at compile time) * `__l` is big enough * `__l * __s <= __osz` can be folded to a constant (I only found this to be true for `mbsrtowcs` and other functions in wchar2.h) In this case `__l * __s <= __osz` is false, and `__whatever_chk_warn` will be called by `__glibc_fortify` or `__glibc_fortify_n` and crash the program. This commit adds the explicit `__osz == -1` check again. moc crashes on startup due to this, see: https://bugs.archlinux.org/task/74041 Minimal test case (test.c): #include <wchar.h> int main (void) { const char *hw = "HelloWorld"; mbsrtowcs (NULL, &hw, (size_t)-1, NULL); return 0; } Build with: gcc -O2 -Wp,-D_FORTIFY_SOURCE=2 test.c -o test && ./test Output: *** buffer overflow detected ***: terminated Fixes: BZ #29030 Signed-off-by: Joan Bruguera <joanbrugueram@gmail.com> Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> (cherry picked from commit 33e03f9cd2be4f2cd62f93fda539cc07d9c8130e)
2022-04-22Default to --with-default-link=no (bug 25812)Florian Weimer
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. (cherry picked from commit 198abcbb94618730dae1b3f4393efaa49e0ec8c7)
2022-04-22scripts: Add glibcelf.py moduleFlorian Weimer
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> (cherry picked from commit 30035d67728a846fa39749cd162afd278ac654c4)
2022-04-20m68k: Handle fewer relocations for RTLD_BOOTSTRAP (#BZ29071)Fangrui Song
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> (cherry picked from commit a8e9b5b8079d18116ca69c9797e77804ecf2ee7e)
2022-04-20nptl: Fix pthread_cancel cancelhandling atomic operationsAdhemerval Zanella
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. (cherry picked from commit 62be9681677e7ce820db721c126909979382d379)
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