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* sparc: Treat the version field in the FPU control word as reservedDaniel Cederman2024-02-191-1/+1
| | | | | | | | | | The FSR version field is read-only and might be non-zero. This allows math/test-fpucw* to correctly pass when the version is non-zero. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Refer to C23 in place of C2X in glibcJoseph Myers2024-02-011-1/+1
| | | | | | | | | | | | | | | WG14 decided to use the name C23 as the informal name of the next revision of the C standard (notwithstanding the publication date in 2024). Update references to C2X in glibc to use the C23 name. This is intended to update everything *except* where it involves renaming files (the changes involving renaming tests are intended to be done separately). In the case of the _ISOC2X_SOURCE feature test macro - the only user-visible interface involved - support for that macro is kept for backwards compatibility, while adding _ISOC23_SOURCE. Tested for x86_64.
* sparc: Fix sparc64 memmove length comparison (BZ 31266)Adhemerval Zanella2024-01-221-1/+1
| | | | | | | | The small counts copy bytes comparsion should be unsigned (as the memmove size argument). It fixes string/tst-memmove-overflow on sparcv9, where the input size triggers an invalid code path. Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
* sparc: Remove 64 bit check on sparc32 wordsize (BZ 27574)Adhemerval Zanella2024-01-221-9/+4
| | | | | | The sparc32 is always 32 bits. Checked on sparcv9-linux-gnu.
* sparc: Do not test preservation of NaN payloads for LEONDaniel Cederman2024-01-181-0/+30
| | | | | | | | The FPU used by LEON does not preserve NaN payload. This change allows the math/test-*-canonicalize tests to pass on LEON. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Force calculation that raises exceptionDaniel Cederman2024-01-181-5/+6
| | | | | | | | | | Use the math_force_eval() macro to force the calculation to complete and raise the exception. With this change the math/test-fenv test pass. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Fix llrint and llround missing exceptions on SPARC V8Daniel Cederman2024-01-181-0/+43
| | | | | | | | | | Conversions from a float to a long long on SPARC v8 uses a libgcc function that may not raise the correct exceptions on overflow. It also may raise spurious "inexact" exceptions on non overflow cases. This patch fixes the problem in the same way as for RV32. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Remove unwind information from signal return stubs [BZ #31244]Daniel Cederman2024-01-181-0/+9
| | | | | | | | | | | | | | | | | | The functions were previously written in C, but were not compiled with unwind information. The ENTRY/END macros includes .cfi_startproc and .cfi_endproc which adds unwind information. This caused the tests cleanup-8 and cleanup-10 in the GCC testsuite to fail. This patch adds a version of the ENTRY/END macros without the CFI instructions that can be used instead. sigaction registers a restorer address that is located two instructions before the stub function. This patch adds a two instruction padding to avoid that the unwinder accesses the unwind information from the function that the linker has placed right before it in memory. This fixes an issue with pthread_cancel that caused tst-mutex8-static (and other tests) to fail. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Prevent stfsr from directly following floating-point instructionDaniel Cederman2024-01-181-1/+6
| | | | | | | | | | | | | On LEON, if the stfsr instruction is immediately following a floating-point operation instruction in a running program, with no other instruction in between the two, the stfsr might behave as if the order was reversed between the two instructions and the stfsr occurred before the floating-point operation. Add a nop instruction before the stfsr to prevent this from happening. Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Use existing macros to avoid code duplicationDaniel Cederman2024-01-181-7/+3
| | | | | | | | | Macros for using inline assembly to access the fp state register exists in both fenv_private.h and in fpu_control.h. Let fenv_private.h use the macros from fpu_control.h Signed-off-by: Daniel Cederman <cederman@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Update copyright dates with scripts/update-copyrightsPaul Eggert2024-01-01301-301/+301
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* Do not build sparc32 libgcc functions into static libcJoseph Myers2023-12-191-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since GCC commit f31a019d1161ec78846473da743aedf49cca8c27 "Emit funcall external declarations only if actually used.", the glibc testsuite has failed to build for 32-bit SPARC with GCC mainline. /scratch/jmyers/glibc-bot/install/compilers/sparc64-linux-gnu/lib/gcc/sparc64-glibc-linux-gnu/14.0.0/../../../../sparc64-glibc-linux-gnu/bin/ld: /scratch/jmyers/glibc-bot/install/compilers/sparc64-linux-gnu/lib/gcc/sparc64-glibc-linux-gnu/14.0.0/32/libgcc.a(_divsi3.o): in function `.div': /scratch/jmyers/glibc-bot/src/gcc/libgcc/config/sparc/lb1spc.S:138: multiple definition of `.div'; /scratch/jmyers/glibc-bot/build/glibcs/sparcv9-linux-gnu/glibc/libc.a(sdiv.o):/scratch/jmyers/glibc-bot/src/glibc/gnulib/../sysdeps/sparc/sparc32/sparcv9/sdiv.S:13: first defined here /scratch/jmyers/glibc-bot/install/compilers/sparc64-linux-gnu/lib/gcc/sparc64-glibc-linux-gnu/14.0.0/../../../../sparc64-glibc-linux-gnu/bin/ld: disabling relaxation; it will not work with multiple definitions collect2: error: ld returned 1 exit status make[3]: *** [../Rules:298: /scratch/jmyers/glibc-bot/build/glibcs/sparcv9-linux-gnu/glibc/nptl/tst-cancel24-static] Error 1 https://sourceware.org/pipermail/libc-testresults/2023q4/012154.html I'm not sure of the exact sequence of undefined references that cause first the glibc object file defining .div and then the libgcc object file defining both .div and .udiv to be pulled in (which must have been perturbed by that GCC change in a way that introduced the build failure), but I think the failure illustrates that it's inherently fragile for glibc to define symbols in separate object files that libgcc defines in the same object file - and indeed for glibc to redefine libgcc symbols at all, since the division into object files shouldn't really be part of the interface between libgcc and libc. These symbols appear to be in libc only for compatibility, maybe one of the cases where they were accidentally exported from shared libc in glibc 2.0 before the introduction of symbol versioning and so programs started expecting shared libc to provide them. Thus, there is no need to have them in static libc. Add this set of libgcc functions to shared-only-routines so they are no longer provided in static libc. (No change is made regarding .mul - dotmul source file - since unlike the other symbols in this grouping, it doesn't actually appear to be a libgcc symbol, at least in current GCC.) Tested with build-many-glibcs.py for sparcv9-linux-gnu with GCC mainline.
* elf: Remove LD_PROFILE for static binariesAdhemerval Zanella2023-11-214-2/+10
| | | | | | | | | | | The _dl_non_dynamic_init does not parse LD_PROFILE, which does not enable profile for dlopen objects. Since dlopen is deprecated for static objects, it is better to remove the support. It also allows to trim down libc.a of profile support. Checked on x86_64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* sparc: Fix broken memset for sparc32 [BZ #31068]Andreas Larsson2023-11-151-2/+2
| | | | | | | | | | | Fixes commit a61933fe27df ("sparc: Remove bzero optimization") that after moving code jumped to the wrong label 4. Verfied by successfully running string/test-memset on sparc32. Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Ludwig Rydberg <ludwig.rydberg@gaisler.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Remove optimize md5, sha256, and sha512Adhemerval Zanella2023-10-3014-454/+0
| | | | | | | | | | The libcrypt was maked to be phase out on 2.38, and a better project already exist that provide both compatibility and better API (libxcrypt). The sparc optimizations add the burden to extra build-many-glibcs.py configurations. Checked on sparc64 and sparcv9. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Remove references to the defunct db2 subdirAndreas Schwab2023-08-211-4/+0
| | | | The db2 subdir has been removed more than 20 years ago.
* configure: Use autoconf 2.71Siddhesh Poyarekar2023-07-172-42/+59
| | | | | | | | | | | | | | Bump autoconf requirement to 2.71 to allow regenerating configure on more recent distributions. autoconf 2.71 has been in Fedora since F36 and is the current version in Debian stable (bookworm). It appears to be current in Gentoo as well. All sysdeps configure and preconfigure scripts have also been regenerated; all changes are trivial transformations that do not affect functionality. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Update sparc libm-test-ulpsAdhemerval Zanella2023-07-171-0/+1
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* sparc: Fix la_symbind for bind-now (BZ 23734)Adhemerval Zanella2023-07-121-0/+49
| | | | | | | | | | | | | | | | | | | | | The sparc ABI has multiple cases on how to handle JMP_SLOT relocations, (sparc_fixup_plt/sparc64_fixup_plt). For BINDNOW, _dl_audit_symbind will be responsible to setup the final relocation value; while for lazy binding _dl_fixup/_dl_profile_fixup will call the audit callback and tail cail elf_machine_fixup_plt (which will call sparc64_fixup_plt). This patch fixes by issuing the SPARC specific routine on bindnow and forwarding the audit value to elf_machine_fixup_plt for lazy resolution. It fixes the la_symbind for bind-now tests on sparc64 and sparcv9: elf/tst-audit24a elf/tst-audit24b elf/tst-audit24c elf/tst-audit24d Checked on sparc64-linux-gnu and sparcv9-linux-gnu. Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
* Fix misspellings in sysdeps/ -- BZ 25337Paul Pluzhnikov2023-05-307-7/+7
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* Remove --enable-tunables configure optionAdhemerval Zanella Netto2023-03-291-2/+3
| | | | | | | | | | | | And make always supported. The configure option was added on glibc 2.25 and some features require it (such as hwcap mask, huge pages support, and lock elisition tuning). It also simplifies the build permutations. Changes from v1: * Remove glibc.rtld.dynamic_sort changes, it is orthogonal and needs more discussion. * Cleanup more code. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* sparc (64bit): Regenerate ulpsAndreas K. Hüttel2023-01-241-3/+4
| | | | | | | Linux catbus 5.15.69-gentoo #1 SMP Sat Sep 24 07:56:24 PDT 2022 sparc64 sun4v UltraSparc T5 (Niagara5) GNU/Linux gcc (Gentoo 11.3.1_p20221209 p3) 11.3.1 20221209 GNU ld (Gentoo 2.38 p4) 2.38 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* Update copyright dates with scripts/update-copyrightsJoseph Myers2023-01-06303-303/+303
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* elf: Introduce <dl-call_tls_init_tp.h> and call_tls_init_tp (bug 29249)Florian Weimer2022-11-031-1/+1
| | | | | | | | This makes it more likely that the compiler can compute the strlen argument in _startup_fatal at compile time, which is required to avoid a dependency on strlen this early during process startup. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* Use PTR_MANGLE and PTR_DEMANGLE unconditionally in C sourcesFlorian Weimer2022-10-181-2/+0
| | | | | | | | | | | | | | | | | In the future, this will result in a compilation failure if the macros are unexpectedly undefined (due to header inclusion ordering or header inclusion missing altogether). Assembler sources are more difficult to convert. In many cases, they are hand-optimized for the mangling and no-mangling variants, which is why they are not converted. sysdeps/s390/s390-32/__longjmp.c and sysdeps/s390/s390-64/__longjmp.c are special: These are C sources, but most of the implementation is in assembler, so the PTR_DEMANGLE macro has to be undefined in some cases, to match the assembler style. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Introduce <pointer_guard.h>, extracted from <sysdep.h>Florian Weimer2022-10-183-0/+3
| | | | | | | | | | | | | | This allows us to define a generic no-op version of PTR_MANGLE and PTR_DEMANGLE. In the future, we can use PTR_MANGLE and PTR_DEMANGLE unconditionally in C sources, avoiding an unintended loss of hardening due to missing include files or unlucky header inclusion ordering. In i386 and x86_64, we can avoid a <tls.h> dependency in the C code by using the computed constant from <tcb-offsets.h>. <sysdep.h> no longer includes these definitions, so there is no cyclic dependency anymore when computing the <tcb-offsets.h> constants. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Remove -fno-tree-loop-distribute-patterns usage on dl-supportAdhemerval Zanella2022-10-102-0/+48
| | | | | | | | | | | | | | Besides the option being gcc specific, this approach is still fragile and not future proof since we do not know if this will be the only optimization option gcc will add that transforms loops to memset (or any libcall). This patch adds a new header, dl-symbol-redir-ifunc.h, that can b used to redirect the compiler generated libcalls to port the generic memset implementation if required. Checked on x86_64-linux-gnu and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* elf: Remove _dl_string_hwcapJavier Pello2022-10-061-13/+0
| | | | | | | | Removal of legacy hwcaps support from the dynamic loader left no users of _dl_string_hwcap. Signed-off-by: Javier Pello <devel@otheo.eu> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Use atomic_exchange_release/acquireWilco Dijkstra2022-09-261-1/+1
| | | | | | | Rename atomic_exchange_rel/acq to use atomic_exchange_release/acquire since these map to the standard C11 atomic builtins. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Makeconfig: Set pie-ccflag to -fPIE by default [BZ# 29514]Richard Henderson2022-08-291-3/+0
| | | | | | | | | | | | We should default to the larger code model, in order to support larger applications built with -static -pie. This should be consistent with pic-ccflag, which defaults to -fPIC. Remove the now redundant override from sysdeps/sparc/Makefile. Note that -fno-pie and -fno-PIE have the same effect. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
* Add bounds check to __libc_ifunc_impl_listWilco Dijkstra2022-06-101-2/+2
| | | | | | | | | | | | Add a proper bounds check to __libc_ifunc_impl_list. This makes MAX_IFUNC redundant and fixes several targets that will write outside the array. To avoid unnecessary large diffs, pass the maximum in the argument 'i' to IFUNC_IMPL_ADD - 'max' can be used in new ifunc definitions and existing ones can be updated if desired. Passes buildmanyglibc. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Remove _dl_skip_args usageAdhemerval Zanella2022-05-302-79/+4
| | | | | | | | | | Since ad43cac44a the generic code already shuffles the argv/envp/auxv on the stack to remove the ld.so own arguments and thus _dl_skip_args is always 0. So there is no need to adjust the argc or argv. Checked on sparc64-linux-gnu and sparcv9-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* math: Add math-use-builtins-fabs (BZ#29027)Adhemerval Zanella2022-05-232-16/+0
| | | | | | | | | | | | | | | | | | Both float, double, and _Float128 are assumed to be supported (float and double already only uses builtins). Only long double is parametrized due GCC bug 29253 which prevents its usage on powerpc. It allows to remove i686, ia64, x86_64, powerpc, and sparc arch specific implementation. On ia64 it also fixes the sNAN handling: math/test-float64x-fabs math/test-ldouble-fabs Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc-linux-gnu, powerpc64-linux-gnu, sparc64-linux-gnu, and ia64-linux-gnu.
* rtld: Remove DL_ARGV_NOT_RELRO and make _dl_skip_args constSzabolcs Nagy2022-05-171-23/+0
| | | | | | | | | | | _dl_skip_args is always 0, so the target specific code that modifies argv after relro protection is applied is no longer used. After the patch relro protection is applied to _dl_argv consistently on all targets. Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf: Replace PI_STATIC_AND_HIDDEN with opposite HIDDEN_VAR_NEEDS_DYNAMIC_RELOCFangrui Song2022-04-262-4/+0
| | | | | | | | | | | | | | | | | | PI_STATIC_AND_HIDDEN indicates whether accesses to internal linkage variables and hidden visibility variables in a shared object (ld.so) need dynamic relocations (usually R_*_RELATIVE). PI (position independent) in the macro name is a misnomer: a code sequence using GOT is typically position-independent as well, but using dynamic relocations does not meet the requirement. Not defining PI_STATIC_AND_HIDDEN is legacy and we expect that all new ports will define PI_STATIC_AND_HIDDEN. Current ports defining PI_STATIC_AND_HIDDEN are more than the opposite. Change the configure default. No functional change. Reviewed-by: Adhemerval 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.
* Remove -z combreloc and HAVE_Z_COMBRELOCFangrui Song2022-04-042-28/+4
| | | | | | | | | | | | | -z combreloc has been the default regadless of the architecture since binutils commit f4d733664aabd7bd78c82895e030ec9779a92809 (2002). The configure check added in commit fdde83499a05 (2001) has long been unneeded. We can therefore treat HAVE_Z_COMBRELOC as always 1 and delete dead code paths in dl-machine.h files (many were copied from commit a711b01d34ca and ee0cb67ec238). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* sparc: Remove s_abs implementationsAdhemerval Zanella2022-04-046-74/+2
| | | | | | | For sparc64 is the same as the generic implementation, while for sparc32 the builtin generates the same code. Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
* sparc: Remove bzero optimizationAdhemerval Zanella2022-02-2314-105/+30
| | | | | The symbol is not present in current POSIX specification and compiler already generates memset call.
* elf: Remove prelink supportAdhemerval Zanella2022-02-102-118/+6
| | | | | | | | | | | | | 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>
* Update copyright dates with scripts/update-copyrightsPaul Eggert2022-01-01309-309/+309
| | | | | | | | | | | | | | | | | | | | | | | I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
* malloc: Remove memusage.hAdhemerval Zanella2021-12-281-20/+0
| | | | | | And use machine-sp.h instead. The Linux implementation is based on already provided CURRENT_STACK_FRAME (used on nptl code) and STACK_GROWS_UPWARD is replaced with _STACK_GROWS_UP.
* Remove atomic-machine.h atomic typedefsAdhemerval Zanella2021-12-281-27/+0
| | | | Now that memusage.c uses generic types we can remove them.
* elf: Add _dl_audit_pltexitAdhemerval Zanella2021-12-282-2/+2
| | | | | | | | | It consolidates the code required to call la_pltexit audit callback. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Florian Weimer <fweimer@redhat.com>
* Replace --enable-static-pie with --disable-default-pieSiddhesh Poyarekar2021-12-131-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | Build glibc programs and tests as PIE by default and enable static-pie automatically if the architecture and toolchain supports it. Also add a new configuration option --disable-default-pie to prevent building programs as PIE. Only the following architectures now have PIE disabled by default because they do not work at the moment. hppa, ia64, alpha and csky don't work because the linker is unable to handle a pcrel relocation generated from PIE objects. The microblaze compiler is currently failing with an ICE. GNU hurd tries to enable static-pie, which does not work and hence fails. All these targets have default PIE disabled at the moment and I have left it to the target maintainers to enable PIE on their targets. build-many-glibcs runs clean for all targets. I also tested x86_64 on Fedora and Ubuntu, to verify that the default build as well as --disable-default-pie work as expected with both system toolchains. Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Remove TLS_TCB_ALIGN and TLS_INIT_TCB_ALIGNFlorian Weimer2021-12-091-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | TLS_INIT_TCB_ALIGN is not actually used. TLS_TCB_ALIGN was likely introduced to support a configuration where the thread pointer has not the same alignment as THREAD_SELF. Only ia64 seems to use that, but for the stack/pointer guard, not for storing tcbhead_t. Some ports use TLS_TCB_OFFSET and TLS_PRE_TCB_SIZE to shift the thread pointer, potentially landing in a different residue class modulo the alignment, but the changes should not impact that. In general, given that TLS variables have their own alignment requirements, having different alignment for the (unshifted) thread pointer and struct pthread would potentially result in dynamic offsets, leading to more complexity. hppa had different values before: __alignof__ (tcbhead_t), which seems to be 4, and __alignof__ (struct pthread), which was 8 (old default) and is now 32. However, it defines THREAD_SELF as: /* Return the thread descriptor for the current thread. */ # define THREAD_SELF \ ({ struct pthread *__self; \ __self = __get_cr27(); \ __self - 1; \ }) So the thread pointer points after struct pthread (hence __self - 1), and they have to have the same alignment on hppa as well. Similarly, on ia64, the definitions were different. We have: # define TLS_PRE_TCB_SIZE \ (sizeof (struct pthread) \ + (PTHREAD_STRUCT_END_PADDING < 2 * sizeof (uintptr_t) \ ? ((2 * sizeof (uintptr_t) + __alignof__ (struct pthread) - 1) \ & ~(__alignof__ (struct pthread) - 1)) \ : 0)) # define THREAD_SELF \ ((struct pthread *) ((char *) __thread_self - TLS_PRE_TCB_SIZE)) And TLS_PRE_TCB_SIZE is a multiple of the struct pthread alignment (confirmed by the new _Static_assert in sysdeps/ia64/libc-tls.c). On m68k, we have a larger gap between tcbhead_t and struct pthread. But as far as I can tell, the port is fine with that. The definition of TCB_OFFSET is sufficient to handle the shifted TCB scenario. This fixes commit 23c77f60181eb549f11ec2f913b4270af29eee38 ("nptl: Increase default TCB alignment to 32"). Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* nptl: Introduce <tcb-access.h> for THREAD_* accessorsFlorian Weimer2021-12-091-9/+1
| | | | | | | These are common between most architectures. Only the x86 targets are outliers. Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
* nptl: Increase default TCB alignment to 32Florian Weimer2021-12-032-7/+0
| | | | | | | | | | rseq support will use a 32-byte aligned field in struct pthread, so the whole struct needs to have at least that alignment. nptl/tst-tls3mod.c uses TCB_ALIGNMENT, therefore include <descr.h> to obtain the fallback definition. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
* String: Add hidden defs for __memcmpeq() to enable internal usageNoah Goldstein2021-10-261-0/+1
| | | | | | | | No bug. This commit adds hidden defs for all declarations of __memcmpeq. This enables usage of __memcmpeq without the PLT for usage internal to GLIBC.
* String: Add support for __memcmpeq() ABI on all targetsNoah Goldstein2021-10-261-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | No bug. This commit adds support for __memcmpeq() as a new ABI for all targets. In this commit __memcmpeq() is implemented only as an alias to the corresponding targets memcmp() implementation. __memcmpeq() is added as a new symbol starting with GLIBC_2.35 and defined in string.h with comments explaining its behavior. Basic tests that it is callable and works where added in string/tester.c As discussed in the proposal "Add new ABI '__memcmpeq()' to libc" __memcmpeq() is essentially a reserved namespace for bcmp(). The means is shares the same specifications as memcmp() except the return value for non-equal byte sequences is any non-zero value. This is less strict than memcmp()'s return value specification and can be better optimized when a boolean return is all that is needed. __memcmpeq() is meant to only be called by compilers if they can prove that the return value of a memcmp() call is only used for its boolean value. All tests in string/tester.c passed. As well build succeeds on x86_64-linux-gnu target.
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