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* Update kernel version to 5.5 in tst-mman-consts.py.Joseph Myers2020-02-071-1/+1
| | | | | | | | This patch updates the kernel version in the test tst-mman-consts.py to 5.5. (There are no new constants covered by this test in 5.5 that need any other header changes.) Tested with build-many-glibcs.py.
* Update syscall lists for Linux 5.5.Joseph Myers2020-02-072-2/+3
| | | | | | | | | Linux 5.5 has no new syscalls to add to syscall-names.list, but it does newly enable the clone3 syscall for AArch64. This patch updates the kernel version listed in syscall-names.list and regenerates the AArch64 arch-syscall.h. Tested with build-many-glibcs.py.
* y2038: linux: Provide __timespec_get64 implementationLukasz Majewski2020-02-051-0/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch provides new instance of Linux specific timespec_get.c file placed in ./sysdeps/unix/sysv/linux/. When compared to this file version from ./time directory, it provides __timespec_get64 explicit 64 bit function for getting 64 bit time in the struct __timespec64 (for compilation using C11 standard). Moreover, a 32 bit version - __timespec_get internally uses __timespec_get64. The __timespec_get is now supposed to be used on systems still supporting 32 bit time (__TIMESIZE != 64) - hence the necessary conversion to 32 bit struct timespec. Internally the timespec_get uses __clock_gettime64. This patch is necessary for having architectures with __WORDSIZE == 32 Y2038 safe. Build tests: ./src/scripts/build-many-glibcs.py glibcs Run-time tests: - Run specific tests on ARM/x86 32bit systems (qemu): https://github.com/lmajewski/meta-y2038 and run tests: https://github.com/lmajewski/y2038-tests/commits/master Above tests were performed with Y2038 redirection applied as well as without to test proper usage of both __timespec_get64 and __timespec_get. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* rt: avoid PLT setup in timer_[sg]ettimeAndreas Schwab2020-02-032-2/+4
| | | | | | | | | | The functions __timer_gettime64 and __timer_settime64 live in librt, not libc. Use proper hidden aliases so that the callers do not need to set up the PLT register. Fixes commits cae1635a70 ("y2038: linux: Provide __timer_settime64 implementation") and 562cdc19c7 ("y2038: linux: Provide __timer_gettime64 implementation").
* y2038: linux: Provide __sched_rr_get_interval64 implementationLukasz Majewski2020-02-022-1/+73
| | | | | | | | | | | | | | | | | | | | | | This patch replaces auto generated wrapper (as described in sysdeps/unix/sysv/linux/syscalls.list) for sched_rr_get_interval with one which adds extra support for reading 64 bit time values on machines with __TIMESIZE != 64. There is no functional change for architectures already supporting 64 bit time ABI. The sched_rr_get_interval declaration in ./include/sched.h is not followed by corresponding libc_hidden_proto(), so it has been assumed that newly introduced syscall wrapper doesn't require libc_hidden_def() (which has been added by template used with auto generation script). Moreover, the code for building sched_rr_gi.c file is already placed in ./posix/Makefiles, so there was no need to add it elsewhere. Performed tests and validation are the same as for timer_gettime() conversion (sysdeps/unix/sysv/linux/timer_gettime.c). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* y2038: linux: Provide __timerfd_settime64 implementationLukasz Majewski2020-02-023-2/+88
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch replaces auto generated wrapper (as described in sysdeps/unix/sysv/linux/syscalls.list) for timerfd_settime with one which adds extra support for reading and writing from Linux kernel 64 bit time values on machines with __TIMESIZE != 64. There is no functional change for archs already supporting 64 bit time ABI. This patch is conceptually identical to timer_settime conversion already done in sysdeps/unix/sysv/linux/timer_settime.c. Please refer to corresponding commit message for detailed description of introduced functions and the testing procedure. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> --- Changes for v4: - Update date from 2019 to 2020 Changes for v3: - Add missing libc_hidden_def() Changes for v2: - Remove "Contributed by" from the file header - Remove early check for (fd < 0) in __timerfd_settime64 as the fd correctness check is already done in Linux kernel - Add single descriptive comment line to provide concise explanation of the code
* y2038: linux: Provide __timerfd_gettime64 implementationLukasz Majewski2020-02-023-2/+70
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch replaces auto generated wrapper (as described in sysdeps/unix/sysv/linux/syscalls.list) for timerfd_gettime with one which adds extra support for reading 64 bit time values on machines with __TIMESIZE != 64. There is no functional change for architectures already supporting 64 bit time ABI. This patch is conceptually identical to timer_gettime conversion already done in sysdeps/unix/sysv/linux/timer_gettime.c. Please refer to corresponding commit message for detailed description of introduced functions and the testing procedure. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> --- Changes for v4: - Update date from 2019 to 2020 Changes for v3: - Add missing libc_hidden_def() Changes for v2: - Remove "Contributed by" from the file header - Remove early check for (fd < 0) in __timerfd_gettime64 as the fd correctness check is already done in Linux kernel - Add single descriptive comment line to provide concise explanation of the code
* i386: Remove _exit.SH.J. Lu2020-02-011-44/+0
| | | | | | | The generic implementation is suffice since __NR_exit_group is always support and i386 does define ABORT_INSTRUCTION. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* i386: Don't unnecessarily save and restore EAX, ECX and EDX [BZ# 25262]H.J. Lu2020-02-014-29/+10
| | | | | | | | | | | On i386, since EAX, ECX and EDX are caller-saved, there are no need to save and restore EAX, ECX and EDX in getcontext, setcontext and swapcontext. They just need to clear EAX on success. The extra scratch registers are needed to enable CET. Tested on i386. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
* Fix tst-pkey.c pkey_alloc return checks and manualLucas A. M. Magalhaes2020-01-171-0/+4
| | | | | | | | | | | | This test was failing in some powerpc systems as it was not checking for ENOSPC return. As said on the Linux man-pages and can be observed by the implementation at mm/mprotect.c in the Linux Kernel source. The syscall pkey_alloc can return EINVAL or ENOSPC. ENOSPC will indicate either that all keys are in use or that the kernel does not support pkeys. Reviewed-by: Gabriel F. T. Gomes <gabriel@inconstante.net.br>
* powerpc: Move cache line size to rtld_global_roTulio Magno Quites Machado Filho2020-01-173-18/+14
| | | | | | | | | | | | | | GCC 10.0 enabled -fno-common by default and this started to point that __cache_line_size had been implemented in 2 different places: loader and libc. In order to avoid this duplication, the libc variable has been removed and the loader variable is moved to rtld_global_ro. File sysdeps/unix/sysv/linux/powerpc/dl-auxv.h has been added in order to reuse code for both static and dynamic linking scenarios. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* powerpc: Initialize rtld_global_ro for static dlopen [BZ #20802]Tulio Magno Quites Machado Filho2020-01-171-2/+11
| | | | | | | Initialize dl_auxv, dl_hwcap and dl_hwcap2 in rtld_global_ro for DSOs that have been statically dlopen'ed. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* linux: Optimize fallback 32-bit clock_getresAdhemerval Zanella2020-01-031-4/+12
| | | | | | | | | | | | | | | | | | | | | | | | This patch avoid probing the __NR_clock_getttime64 syscall each time __clock_gettime64 is issued on a kernel without 64 bit time support. Once ENOSYS is obtained, only 32-bit clock_gettime are used. The following snippet: clock_getres (CLOCK_REALTIME, &(struct timespec) { 0 }); clock_getres (CLOCK_MONOTONIC, &(struct timespec) { 0 }); clock_getres (CLOCK_BOOTTIME, &(struct timespec) { 0 }); clock_getres (20, &(struct timespec) { 0 }); On a kernel without 64 bit time support issues the syscalls: syscall_0x196(0, 0xffb83330, [...]) = -1 ENOSYS (Function not implemented) clock_getres(CLOCK_REALTIME, {tv_sec=0, tv_nsec=1}) = 0 clock_getres(CLOCK_MONOTONIC, {tv_sec=0, tv_nsec=1}) = 0 clock_getres(CLOCK_BOOTTIME, {tv_sec=0, tv_nsec=1}) = 0 Checked on i686-linux-gnu on 4.15 kernel. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Add support for clock_getres64 vDSOAdhemerval Zanella2020-01-038-12/+24
| | | | | | | | No architecture currently defines the vDSO symbol. On archictures with 64-bit time_t the HAVE_CLOCK_GETRES_VSYSCALL is renamed to HAVE_CLOCK_GETRES64_VSYSCALL, it simplifies clock_gettime code. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Enable vDSO clock_gettime64 for mipsAdhemerval Zanella2020-01-031-0/+5
| | | | | | It was added on Linux 5.4 (commit 1f66c45db3302). Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Enable vDSO clock_gettime64 for armAdhemerval Zanella2020-01-031-0/+1
| | | | | | It was added on Linux 5.5 (commit 74d06efb9c2f9). Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Enable vDSO clock_gettime64 for i386Adhemerval Zanella2020-01-031-0/+1
| | | | | | | | It was added on Linux 5.3 (commit 22ca962288c0a). Checked on i686-linux-gnu with 5.3.0 kernel. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Optimize fallback 32-bit clock_gettimeAdhemerval Zanella2020-01-031-4/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch avoid probing the __NR_clock_getttime64 syscall each time __clock_gettime64 is issued on a kernel without 64 bit time support. Once ENOSYS is obtained, only 32-bit clock_gettime are used. The following snippet: clock_gettime (CLOCK_REALTIME, &(struct timespec) { 0 }); clock_gettime (CLOCK_MONOTONIC, &(struct timespec) { 0 }); clock_gettime (CLOCK_BOOTTIME, &(struct timespec) { 0 }); clock_gettime (20, &(struct timespec) { 0 }); On a kernel without 64 bit time support and with vDSO support results on the following syscalls: syscall_0x193(0, 0xff87ba30, [...]) = -1 ENOSYS (Function not implemented) clock_gettime(CLOCK_BOOTTIME, {tv_sec=927082, tv_nsec=474382032}) = 0 clock_gettime(0x14 /* CLOCK_??? */, 0xff87b9f8) = -1 EINVAL (Invalid argument) While on a kernel without vDSO support: syscall_0x193(0, 0xbec95550, 0xb6ed2000, 0x1, 0xbec95550, 0) = -1 (errno 38) clock_gettime(CLOCK_REALTIME, {tv_sec=1576615930, tv_nsec=638250162}) = 0 clock_gettime(CLOCK_MONOTONIC, {tv_sec=1665478, tv_nsec=638779620}) = 0 clock_gettime(CLOCK_BOOTTIME, {tv_sec=1675418, tv_nsec=292932704}) = 0 clock_gettime(0x14 /* CLOCK_??? */, 0xbec95530) = -1 EINVAL (Invalid argument) Checked on i686-linux-gnu on 4.15 kernel and on a 5.3 kernel. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Add support for clock_gettime64 vDSOAdhemerval Zanella2020-01-039-12/+34
| | | | | | | | No architecture currently defines the vDSO symbol. On architectures with 64-bit time_t the HAVE_CLOCK_GETTIME_VSYSCALL is renamed to HAVE_CLOCK_GETTIME64_VSYSCALL, it simplifies clock_gettime code. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* elf: Move vDSO setup to rtld (BZ#24967)Adhemerval Zanella2020-01-0321-272/+162
| | | | | | | | | | | | | | | | | | | | | | | | This patch moves the vDSO setup from libc to loader code, just after the vDSO link_map setup. For static case the initialization is moved to _dl_non_dynamic_init instead. Instead of using the mangled pointer, the vDSO data is set as attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for static). It is read-only even with partial relro. It fixes BZ#24967 now that the vDSO pointer is setup earlier than malloc interposition is called. Also, vDSO calls should not be a problem for static dlopen as indicated by BZ#20802. The vDSO pointer would be zero-initialized and the syscall will be issued instead. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. I also run some tests on mips. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Consolidate time implementationAdhemerval Zanella2020-01-033-55/+54
| | | | | | | | | | | The IFUNC bypass to vDSO is used when USE_IFUNC_TIME is set. Currently powerpc and x86 defines it. Otherwise the generic implementation is used, which calls clock_gettime. Checked on powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu-power4, x86_64-linux-gnu, and i686-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Consolidate Linux gettimeofdayAdhemerval Zanella2020-01-034-100/+63
| | | | | | | | | | | | The IFUNC bypass to vDSO is used when USE_IFUNC_GETTIMEOFDAY is set. Currently aarch64, powerpc*, and x86 defines it. Otherwise the generic implementation is used, which calls clock_gettime. Checked on aarch64-linux-gnu, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu-power4, x86_64-linux-gnu, and i686-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Update mips vDSO symbolsAdhemerval Zanella2020-01-031-0/+1
| | | | | | | | | The clock_getres is a new implementation added on Linux 5.4 (abed3d826f2f). Checked with a build against mips-linux-gnu and mips64-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Update x86 vDSO symbolsAdhemerval Zanella2020-01-033-4/+4
| | | | | | | | | | | | | Add the missing time and clock_getres vDSO symbol names on x86. For time, the iFUNC already uses expected name so it affects only the static build. The clock_getres is a new implementation added on Linux 5.3 (f66501dc53e72). Checked on x86-linux-gnu and i686-linux-gnu. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Remove vDSO support from make-syscall.shAdhemerval Zanella2020-01-031-44/+1
| | | | | | | | | | | | | | | | | The auto-generated vDSO call shows some issues: - It requires sync the auto-generated C file with current glibc implementation; - It still uses symbol redirections hacks where libc-symbols.h provide macros that uses compiler builtins (libc_ifunc_redirected for instance); - It does not handle all required compiler handling (inhibit_stack_protector on iFUNC resolver). - No architecure uses it. Checked with a build against all major ABIs. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* x86: Make x32 use x86 time implementationAdhemerval Zanella2020-01-032-2/+0
| | | | | | | | | | This is the only use of auto-generation syscall which uses a vDSO plus IFUNC and the current x86 generic implementation already covers the expected semantic. Checked on x86_64-linux-gnu-x32. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* linux: Fix vDSO macros build with time64 interfacesAdhemerval Zanella2020-01-0310-98/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As indicated on libc-help [1] the ec138c67cb commit broke 32-bit builds when configured with --enable-kernel=5.1 or higher. The scenario 10 from [2] might also occur in this configuration and INLINE_VSYSCALL will try to use the vDSO symbol and HAVE_CLOCK_GETTIME64_VSYSCALL does not set HAVE_VSYSCALL prior its usage. Also, there is no easy way to just enable the code to use one vDSO symbol since the macro INLINE_VSYSCALL is redefined if HAVE_VSYSCALL is set. Instead of adding more pre-processor handling and making the code even more convoluted, this patch removes the requirement of defining HAVE_VSYSCALL before including sysdep-vdso.h to enable vDSO usage. The INLINE_VSYSCALL is now expected to be issued inside a HAVE_*_VSYSCALL check, since it will try to use the internal vDSO pointers. Both clock_getres and clock_gettime vDSO code for time64_t were removed since there is no vDSO setup code for the symbol (an architecture can not set HAVE_CLOCK_GETTIME64_VSYSCALL). Checked on i686-linux-gnu (default and with --enable-kernel=5.1), x86_64-linux-gnu, aarch64-linux-gnu, and powerpc64le-linux-gnu. I also checked against a build to mips64-linux-gnu and sparc64-linux-gnu. [1] https://sourceware.org/ml/libc-help/2019-12/msg00014.html [2] https://sourceware.org/ml/libc-alpha/2019-12/msg00142.html Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Linux: Fix clock_nanosleep time64 checkAdhemerval Zanella2020-01-031-8/+12
| | | | | | | | The result of INTERNAL_SYSCALL_CANCEL should be checked with macros INTERNAL_SYSCALL_ERROR_P and INTERNAL_SYSCALL_ERRNO instead of comparing the result directly. Checked on powerpc-linux-gnu.
* Linux: Remove pread/pread64, pwrite/pwrite64 kludges from <sysdep.h>Florian Weimer2020-01-024-40/+0
| | | | | | Since the switch away from auto-generated wrappers for these system calls, the kludge is already included in the C source file of the system call wrapper.
* Linux: Use system call tables during buildFlorian Weimer2020-01-0218-55/+43
| | | | | | | | | | | | | | | | | | | | | | | Use <arch-syscall.h> instead of <asm/unistd.h> to obtain the system call numbers. A few direct includes of <asm/unistd.h> need to be removed (if the system call numbers are already provided indirectly by <sysdep.h>) or replaced with <sys/syscall.h>. Current Linux headers for alpha define the required system call names, so most of the _NR_* hacks are no longer needed. For the 32-bit arm architecture, eliminate the INTERNAL_SYSCALL_ARM macro, now that we have regular system call names for cacheflush and set_tls. There are more such cleanup opportunities for other architectures, but these cleanups are required to avoid macro redefinition errors during the build. For ia64, it is desirable to use <asm/break.h> directly to obtain the break number for system calls (which is not a system call number itself). This requires replacing __BREAK_SYSCALL with __IA64_BREAK_SYSCALL because the former is defined as an alias in <asm/unistd.h>, but not in <asm/break.h>. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Linux: Add tables with system call numbersFlorian Weimer2020-01-0230-22/+9050
| | | | | | | | | | | | | | | | | | | | | | | | | | | The new tables are currently only used for consistency checks with the installed kernel headers and the architecture-independent system call names table. They are based on Linux 5.4. The goal is to use these architecture-specific tables to ensure that system call wrappers are available irrespective of the version of the installed kernel headers. The tables are formatted in the form of C header files so that they can be used directly in an #include directive, without external preprocessing. (External preprocessing of a plain table file would introduce cross-subdirectory dependency issues.) However, the intent is that they can still be treated as tables and can be processed by simple tools. The irregular system call names on 32-bit arm add a complication. The <fixup-asm-unistd.h> header is introduced to work around that, and the system calls are listed under regular names in the <arch-syscall.h> file. A make target, update-syscalls-list, is added to patch the glibc sources with data from the current kernel headers. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
* Update copyright dates not handled by scripts/update-copyrights.Joseph Myers2020-01-012-2/+2
| | | | | | | | | | | | | | | I've updated copyright dates in glibc for 2020. This is the patch for the changes not generated by scripts/update-copyrights and subsequent build / regeneration of generated files. As well as the usual annual updates, mainly dates in --version output (minus libc.texinfo which previously had to be handled manually but is now successfully updated by update-copyrights), there is a fix to sysdeps/unix/sysv/linux/powerpc/bits/termios-c_lflag.h where a typo in the copyright notice meant it failed to be updated automatically. Please remember to include 2020 in the dates for any new files added in future (which means updating any existing uncommitted patches you have that add new files to use the new copyright dates in them).
* Update copyright dates with scripts/update-copyrights.Joseph Myers2020-01-011442-1442/+1442
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* alpha: Set wait4 as cancellation entrypointAdhemerval Zanella2019-12-302-1/+26
| | | | | | | Since both wait and waitpid are implemented on top of wait4. It fixes nptl/tst-cancel{x}{4,5,7}. Checked on alpha-linux-gnu.
* Do not redirect calls to __GI_* symbols, when redirecting to *ieee128Tulio Magno Quites Machado Filho2019-12-272-0/+2
| | | | | | | | | | | | | | | | | | | | | | On platforms where long double has IEEE binary128 format as a third option (initially, only powerpc64le), many exported functions are redirected to their __*ieee128 equivalents. This redirection is provided by installed headers such as stdio-ldbl.h, and is supposed to work correctly with user code. However, during the build of glibc, similar redirections are employed, in internal headers, such as include/stdio.h, in order to avoid extra PLT entries. These redirections conflict with the redirections to __*ieee128, and must be avoided during the build. This patch protects the second redirections with a test for __LONG_DOUBLE_USES_FLOAT128, a new macro that is defined to 1 when functions that deal with long double typed values reuses the _Float128 implementation (this is currently only true for powerpc64le). Tested for powerpc64le, x86_64, and with build-many-glibcs.py. Co-authored-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com> Reviewed-by: Florian Weimer <fweimer@redhat.com>
* aarch64: ifunc rename for kunpengXuelei Zhang2019-12-272-2/+2
| | | | | | | Rename ifunc for kunpeng to kunpeng920, and modify the corresponding function files including IS_KUNPENG920 judgement. Checked on aarch64-linux-gnu.
* linux: Consolidate sigprocmaskAdhemerval Zanella2019-12-276-220/+3
| | | | | | | | All architectures now uses the Linux generic implementation which uses __NR_rt_sigprocmask. Checked on x86_64-linux-gnu, sparc64-linux-gnu, ia64-linux-gnu, s390x-linux-gnu, and alpha-linux-gnu.
* Fix return code for __libc_signal_* functionsAdhemerval Zanella2019-12-271-9/+9
| | | | | | | | The functions do not fail regardless of the argument value. Also, for Linux the return value is not correct on some platforms due the missing usage of INTERNAL_SYSCALL_ERROR_P / INTERNAL_SYSCALL_ERRNO macros. Checked on x86_64-linux-gnu, i686-linux-gnu, and sparc64-linux-gnu.
* aarch64: Add Huawei Kunpeng to tunable cpu listXuelei Zhang2019-12-192-0/+4
| | | | | | | | | | | Kunpeng processer is a 64-bit Arm-compatible CPU released by Huawei, and we have already signed a copyright assignement with the FSF. This patch adds its to cpu list, and related macro for IFUNC. Checked on aarch64-linux-gnu. Reviewed-by: Szabolcs Nagy <Szabolcs.Nagy@arm.com>
* Consolidate wait3 implementationsAdhemerval Zanella2019-12-192-34/+0
| | | | | | The generic one calls wait4. Checked on x86_64-linux-gnu.
* Implement waitpid in terms of wait4Adhemerval Zanella2019-12-193-76/+1
| | | | | | This also consolidate all waitpid implementations. Checked on x86_64-linux-gnu.
* linux: Use waitid on wait4 if __NR_wait4 is not definedAdhemerval Zanella2019-12-193-1/+90
| | | | | | | | | | | | | | | | | | | | | | If the wait4 syscall is not available (such as y2038 safe 32-bit systems) waitid should be used instead. However prior Linux 5.4 waitid is not a full superset of other wait syscalls, since it does not include support for waiting for the current process group. It is possible to emulate wait4 by issuing an extra syscall to get the current process group, but it is inherent racy: after the current process group is received and before it is passed to waitid a signal could arrive causing the current process group to change. So waitid is used if wait4 is not defined iff the build is enabled with a minimum kernel if 5.4+. The new assume __ASSUME_WAITID_PID0_P_PGID is added and an error is issued if waitid can not be implemented by either __NR_wait4 or __NR_waitid && __ASSUME_WAITID_PID0_P_PGID. Checked on x86_64-linux-gnu and i686-linux-gnu. Co-authored-by: Alistair Francis <alistair.francis@wdc.com>
* Implement wait in terms of waitpidAdhemerval Zanella2019-12-192-67/+0
| | | | | | | | | The POSIX implementation is used as default and both BSD and Linux version are removed. It simplifies the implementation for architectures that do not provide either __NR_waitpid or __NR_wait4. Checked on x86_64-linux-gnu and powerpc64le-linux-gnu.
* nptl: Move waitpid implementation to libcAdhemerval Zanella2019-12-1927-27/+0
| | | | Checked on x86_64-linux-gnu and powerpc64le-linux-gnu.
* nptl: Move wait implementation to libcAdhemerval Zanella2019-12-1927-54/+0
| | | | Checked on x86_64-linux-gnu and powerpc64le-linux-gnu.
* Remove __waitpid_nocancelAdhemerval Zanella2019-12-193-39/+1
| | | | | | | | | It enables and disables cancellation with pthread_setcancelstate before calling the waitpid. It simplifies the waitpid implementation for architectures that do not provide either __NR_waitpid or __NR_wait4. Checked on x86_64-linux-gnu.
* Fix __libc_signal_block_all on sparc64Adhemerval Zanella2019-12-191-6/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The posix_spawn on sparc issues invalid sigprocmask calls: rt_sigprocmask(0xffe5e15c /* SIG_??? */, ~[], 0xffe5e1dc, 8) = -1 EINVAL (Invalid argument) Which make support/tst-support_capture_subprocess fails with random output (due the child signal being wrongly captured by the parent). Tracking the culprit it seems to be a wrong code generation in the INTERNAL_SYSCALL due the automatic sigset_t used on __libc_signal_block_all: return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET, set, _NSIG / 8); Where SIGALL_SET is defined as: ((__sigset_t) { .__val = {[0 ... _SIGSET_NWORDS-1 ] = -1 } }) Building the expanded __libc_signal_block_all on sparc64 with recent compiler (gcc 8.3.1 and 9.1.1): #include <signal> int _libc_signal_block_all (sigset_t *set) { INTERNAL_SYSCALL_DECL (err); return INTERNAL_SYSCALL (rt_sigprocmask, err, 4, SIG_BLOCK, &SIGALL_SET, set, _NSIG / 8); } The first argument (SIG_BLOCK) is not correctly set on 'o0' register: __libc_signal_block_all: save %sp, -304, %sp add %fp, 1919, %o0 mov 128, %o2 sethi %hi(.LC0), %o1 call memcpy, 0 or %o1, %lo(.LC0), %o1 add %fp, 1919, %o1 mov %i0, %o2 mov 8, %o3 mov 103, %g1 ta 0x6d; bcc,pt %xcc, 1f mov 0, %g1 sub %g0, %o0, %o0 mov 1, %g1 1: sra %o0, 0, %i0 return %i7+8 nop Where if SIGALL_SET is defined a const object, gcc correctly sets the expected kernel argument in correct register: sethi %hi(.LC0), %o1 call memcpy, 0 or %o1, %lo(.LC0), %o1 -> mov 1, %o0 add %fp, 1919, %o1 Another possible fix is use a static const object. Although there should not be a difference between a const compound literal and a static const object, the gcc C99 status page [1] has a note stating that this optimization is not implemented: "const-qualified compound literals could share storage with each other and with string literals, but currently don't.". This patch fixes it by moving both sigset_t that represent the signal sets to static const data object. It generates slight better code where the object reference is used directly instead of a stack allocation plus the content materialization. Checked on x86_64-linux-gnu, i686-linux-gnu, and sparc64-linux-gnu. [1] https://gcc.gnu.org/c99status.html
* mips: Do not include hi and lo in __SYSCALL_CLOBBERS for R6Dragan Mladjenovic2019-12-163-6/+21
| | | | | | | | | | | | | | | | | | | GCC 10 (PR 91233) won't silently allow registers that are not architecturally available to be present in the clobber list anymore, resulting in build failure for mips*r6 targets in form of: ... .../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target 146 | __asm__ volatile ( \ | ^~~~~~~ This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension. This patch provides the alternative definitions of __SYSCALL_CLOBBERS for r6 targets that won't include those registers. * sysdeps/unix/sysv/linux/mips/mips32/sysdep.h (__SYSCALL_CLOBBERS): Exclude hi and lo from the clobber list for __mips_isa_rev >= 6. * sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h (__SYSCALL_CLOBBERS): Likewise. * sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h (__SYSCALL_CLOBBERS): Likewise.
* hurd: Fix local PLTSamuel Thibault2019-12-131-2/+4
| | | | | | | | | | * include/sys/random.h (__getrandom): Add hidden prototype. * stdlib/getrandom.c (getrandom): Rename to hidden definition __getrandom. Add weak alias. * sysdeps/mach/hurd/getrandom.c (getrandom): Likewise. * sysdeps/unix/sysv/linux/getrandom.c (getrandom): Likewise. * sysdeps/mach/hurd/getentropy.c (getentropy): Use __getrandom instead of getrandom.
* nptl: Add more missing placeholder abi symbol from nanosleep moveAdhemerval Zanella2019-12-0915-9/+15
| | | | | | | | | | | | | | | | | | | | This patch adds the missing __libpthread_version_placeholder for GLIBC_2.2.6 version from the nanosleep implementation move from libpthread to libc (79a547b162). It also fixes the wrong compat symbol definitions added by changing back the version used on vfork check and remove the __libpthread_version_placeholder added on some ABI (4f4bb489e0dd). The __libpthread_version_placeholder is also refactored to make it simpler to add new compat_symbols by adding a new macro compat_symbol_unique which uses the compiler extension __COUNTER__ to generate unique strong alias to be used with compat_symbol. Checked with a updated-abi on the all affected abis of the nanosleep move. Change-Id: I347a4dbdc931bb42b359456932dd1e17aa4d4078
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