mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
460860f457
Linux 6.7 removed ia64 from the official tree [1], following the general principle that a glibc port needs upstream support for the architecture in all the components it depends on (binutils, GCC, and the Linux kernel). Apart from the removal of sysdeps/ia64 and sysdeps/unix/sysv/linux/ia64, there are updates to various comments referencing ia64 for which removal of those references seemed appropriate. The configuration is removed from README and build-many-glibcs.py. The CONTRIBUTED-BY, elf/elf.h, manual/contrib.texi (the porting mention), *.po files, config.guess, and longlong.h are not changed. For Linux it allows cleanup some clone2 support on multiple files. The following bug can be closed as WONTFIX: BZ 22634 [2], BZ 14250 [3], BZ 21634 [4], BZ 10163 [5], BZ 16401 [6], and BZ 11585 [7]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43ff221426d33db909f7159fdf620c3b052e2d1c [2] https://sourceware.org/bugzilla/show_bug.cgi?id=22634 [3] https://sourceware.org/bugzilla/show_bug.cgi?id=14250 [4] https://sourceware.org/bugzilla/show_bug.cgi?id=21634 [5] https://sourceware.org/bugzilla/show_bug.cgi?id=10163 [6] https://sourceware.org/bugzilla/show_bug.cgi?id=16401 [7] https://sourceware.org/bugzilla/show_bug.cgi?id=11585 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
261 lines
9.1 KiB
C
261 lines
9.1 KiB
C
/* Set flags signalling availability of kernel features based on given
|
|
kernel version number.
|
|
Copyright (C) 1999-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
/* This file must not contain any C code. At least it must be protected
|
|
to allow using the file also in assembler files. */
|
|
|
|
#ifndef _LINUX_KERNEL_FEATURES_H
|
|
#define _LINUX_KERNEL_FEATURES_H 1
|
|
|
|
#include <bits/wordsize.h>
|
|
|
|
#ifndef __LINUX_KERNEL_VERSION
|
|
/* We assume the worst; all kernels should be supported. */
|
|
# define __LINUX_KERNEL_VERSION 0
|
|
#endif
|
|
|
|
/* We assume for __LINUX_KERNEL_VERSION the same encoding used in
|
|
linux/version.h. I.e., the major, minor, and subminor all get a
|
|
byte with the major number being in the highest byte. This means
|
|
we can do numeric comparisons.
|
|
|
|
In the following we will define certain symbols depending on
|
|
whether the describes kernel feature is available in the kernel
|
|
version given by __LINUX_KERNEL_VERSION. We are not always exactly
|
|
recording the correct versions in which the features were
|
|
introduced. If somebody cares these values can afterwards be
|
|
corrected. */
|
|
|
|
/* The statfs64 syscalls are available in 2.5.74 (but not for alpha). */
|
|
#define __ASSUME_STATFS64 1
|
|
|
|
/* pselect/ppoll were introduced just after 2.6.16-rc1. On x86_64 and
|
|
SH this appeared first in 2.6.19-rc1. */
|
|
#define __ASSUME_PSELECT 1
|
|
|
|
/* Support for inter-process robust mutexes was added in 2.6.17 (but
|
|
some architectures lack futex_atomic_cmpxchg_inatomic in some
|
|
configurations). */
|
|
#define __ASSUME_SET_ROBUST_LIST 1
|
|
|
|
/* Support for various CLOEXEC and NONBLOCK flags was added in
|
|
2.6.27. */
|
|
#define __ASSUME_IN_NONBLOCK 1
|
|
|
|
/* Support for preadv and pwritev was added in 2.6.30. */
|
|
#define __ASSUME_PREADV 1
|
|
#define __ASSUME_PWRITEV 1
|
|
|
|
/* Support for sendmmsg functionality was added in 3.0. */
|
|
#define __ASSUME_SENDMMSG 1
|
|
|
|
/* On most architectures, most socket syscalls are supported for all
|
|
supported kernel versions, but on some socketcall architectures
|
|
separate syscalls were only added later. */
|
|
#define __ASSUME_SENDMSG_SYSCALL 1
|
|
#define __ASSUME_RECVMSG_SYSCALL 1
|
|
#define __ASSUME_ACCEPT_SYSCALL 1
|
|
#define __ASSUME_CONNECT_SYSCALL 1
|
|
#define __ASSUME_RECVFROM_SYSCALL 1
|
|
#define __ASSUME_SENDTO_SYSCALL 1
|
|
#define __ASSUME_ACCEPT4_SYSCALL 1
|
|
#define __ASSUME_RECVMMSG_SYSCALL 1
|
|
#define __ASSUME_SENDMMSG_SYSCALL 1
|
|
#define __ASSUME_GETSOCKOPT_SYSCALL 1
|
|
#define __ASSUME_SETSOCKOPT_SYSCALL 1
|
|
#define __ASSUME_BIND_SYSCALL 1
|
|
#define __ASSUME_SOCKET_SYSCALL 1
|
|
#define __ASSUME_SOCKETPAIR_SYSCALL 1
|
|
#define __ASSUME_LISTEN_SYSCALL 1
|
|
#define __ASSUME_SHUTDOWN_SYSCALL 1
|
|
#define __ASSUME_GETSOCKNAME_SYSCALL 1
|
|
#define __ASSUME_GETPEERNAME_SYSCALL 1
|
|
|
|
/* Support for SysV IPC through wired syscalls. All supported architectures
|
|
either support ipc syscall and/or all the ipc correspondent syscalls. */
|
|
#define __ASSUME_DIRECT_SYSVIPC_SYSCALLS 1
|
|
/* The generic default __IPC_64 value is 0x0, however some architectures
|
|
require a different value of 0x100. */
|
|
#define __ASSUME_SYSVIPC_DEFAULT_IPC_64 1
|
|
|
|
/* All supported architectures reserve a 32-bit for MODE field in sysvipc
|
|
ipc_perm. However, some kernel ABI interfaces still expect a 16-bit
|
|
field. This is only an issue if arch-defined IPC_PERM padding is on a
|
|
wrong position regarding endianness. In this case, the IPC control
|
|
routines (msgctl, semctl, and semtctl) requires to shift the value to
|
|
correct place.
|
|
The ABIs that requires it define __ASSUME_SYSVIPC_BROKEN_MODE_T. */
|
|
|
|
/* Support for p{read,write}v2 was added in 4.6. However Linux default
|
|
implementation does not assume the __ASSUME_* and instead use a fallback
|
|
implementation based on p{read,write}v and returning an error for
|
|
non supported flags. */
|
|
|
|
/* Support for the renameat2 system call was added in kernel 3.15. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x030F00
|
|
# define __ASSUME_RENAMEAT2
|
|
#endif
|
|
|
|
/* Support for the execveat syscall was added in 3.19. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x031300
|
|
# define __ASSUME_EXECVEAT 1
|
|
#endif
|
|
|
|
#if __LINUX_KERNEL_VERSION >= 0x040400
|
|
# define __ASSUME_MLOCK2 1
|
|
#endif
|
|
|
|
/* Support for statx was added in kernel 4.11. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x040B00
|
|
# define __ASSUME_STATX 1
|
|
#endif
|
|
|
|
/* Support for clone call used on fork. The signature varies across the
|
|
architectures with current 4 different variants:
|
|
|
|
1. long int clone (unsigned long flags, unsigned long newsp,
|
|
int *parent_tidptr, unsigned long tls,
|
|
int *child_tidptr)
|
|
|
|
2. long int clone (unsigned long newsp, unsigned long clone_flags,
|
|
int *parent_tidptr, int * child_tidptr,
|
|
unsigned long tls)
|
|
|
|
3. long int clone (unsigned long flags, unsigned long newsp,
|
|
int stack_size, int *parent_tidptr,
|
|
int *child_tidptr, unsigned long tls)
|
|
|
|
4. long int clone (unsigned long flags, unsigned long newsp,
|
|
int *parent_tidptr, int *child_tidptr,
|
|
unsigned long tls)
|
|
|
|
The fourth variant is intended to be used as the default for newer ports,
|
|
|
|
The macros names to define the variant used for the architecture is
|
|
similar to kernel:
|
|
|
|
- __ASSUME_CLONE_BACKWARDS: for variant 1.
|
|
- __ASSUME_CLONE_BACKWARDS2: for variant 2 (s390).
|
|
- __ASSUME_CLONE_BACKWARDS3: for variant 3 (microblaze).
|
|
- __ASSUME_CLONE_DEFAULT: for variant 4.
|
|
*/
|
|
|
|
#define __ASSUME_CLONE_DEFAULT 1
|
|
|
|
/* Support for 64-bit time_t in the system call interface. When this
|
|
flag is set, the kernel provides a version of each of these system
|
|
calls that accepts 64-bit time_t:
|
|
|
|
clock_adjtime(64)
|
|
clock_gettime(64)
|
|
clock_settime(64)
|
|
clock_getres(_time64)
|
|
clock_nanosleep(_time64)
|
|
futex(_time64)
|
|
mq_timedreceive(_time64)
|
|
mq_timedsend(_time64)
|
|
ppoll(_time64)
|
|
pselect6(_time64)
|
|
rt_sigtimedwait(_time64)
|
|
sched_rr_get_interval(_time64)
|
|
timer_gettime(64)
|
|
timer_settime(64)
|
|
timerfd_gettime(64)
|
|
timerfd_settime(64)
|
|
utimensat(_time64)
|
|
|
|
On architectures where time_t has historically been 64 bits,
|
|
only the 64-bit version of each system call exists, and there
|
|
are no suffixes on the __NR_ constants.
|
|
|
|
On architectures where time_t has historically been 32 bits,
|
|
both 32-bit and 64-bit versions of each system call may exist,
|
|
depending on the kernel version. When the 64-bit version exists,
|
|
there is a '64' or '_time64' suffix on the name of its __NR_
|
|
constant, as shown above.
|
|
|
|
This flag is always set for Linux 5.1 and later. Prior to that
|
|
version, it is set only for some CPU architectures and ABIs:
|
|
|
|
- __WORDSIZE == 64 - all supported architectures where pointers
|
|
are 64 bits also have always had 64-bit time_t.
|
|
|
|
- __WORDSIZE == 32 && __SYSCALL_WORDSIZE == 64 - this describes
|
|
only one supported configuration, x86's 'x32' subarchitecture,
|
|
where pointers are 32 bits but time_t has always been 64 bits.
|
|
|
|
__ASSUME_TIME64_SYSCALLS being set does not mean __TIMESIZE is 64,
|
|
and __TIMESIZE equal to 64 does not mean __ASSUME_TIME64_SYSCALLS
|
|
is set. All four cases are possible. */
|
|
|
|
#if __LINUX_KERNEL_VERSION >= 0x050100 \
|
|
|| __WORDSIZE == 64 \
|
|
|| (defined __SYSCALL_WORDSIZE && __SYSCALL_WORDSIZE == 64)
|
|
# define __ASSUME_TIME64_SYSCALLS 1
|
|
#endif
|
|
|
|
/* Linux waitid prior kernel 5.4 does not support waiting for the current
|
|
process group. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x050400
|
|
# define __ASSUME_WAITID_PID0_P_PGID
|
|
#endif
|
|
|
|
/* The faccessat2 system call was introduced across all architectures
|
|
in Linux 5.8. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x050800
|
|
# define __ASSUME_FACCESSAT2 1
|
|
#else
|
|
# define __ASSUME_FACCESSAT2 0
|
|
#endif
|
|
|
|
/* The close_range system call was introduced across all architectures
|
|
in Linux 5.9. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x050900
|
|
# define __ASSUME_CLOSE_RANGE 1
|
|
#else
|
|
# define __ASSUME_CLOSE_RANGE 0
|
|
#endif
|
|
|
|
/* The FUTEX_LOCK_PI2 operation was introduced across all architectures in Linux
|
|
5.14. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x050e00
|
|
# define __ASSUME_FUTEX_LOCK_PI2 1
|
|
#else
|
|
# define __ASSUME_FUTEX_LOCK_PI2 0
|
|
#endif
|
|
|
|
/* The clone3 system call was introduced across on most architectures in
|
|
Linux 5.3. Not all ports implements it, so it should be used along
|
|
HAVE_CLONE3_WRAPPER define. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x050300
|
|
# define __ASSUME_CLONE3 1
|
|
#else
|
|
# define __ASSUME_CLONE3 0
|
|
#endif
|
|
|
|
/* The fchmodat2 system call was introduced across all architectures
|
|
in Linux 6.6. */
|
|
#if __LINUX_KERNEL_VERSION >= 0x060600
|
|
# define __ASSUME_FCHMODAT2 1
|
|
#else
|
|
# define __ASSUME_FCHMODAT2 0
|
|
#endif
|
|
|
|
#endif /* kernel-features.h */
|