sysdeps/unix/sysv/linux/sparc/kernel-features.h

   1 /* Set flags signalling availability of kernel features based on given
   2    kernel version number.  SPARC version.
   3    Copyright (C) 1999-2022 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include_next <kernel-features.h>
  21
  22 /* 32-bit SPARC kernels do not support
  23    futex_atomic_cmpxchg_inatomic.  */
  24 #if !defined __arch64__ && !defined __sparc_v9__
  25 # undef __ASSUME_SET_ROBUST_LIST
  26 #endif
  27
  28 /* These syscalls were added for 32-bit in 4.4 (but present for 64-bit
  29    in all supported kernel versions); the architecture-independent
  30    kernel-features.h assumes some of them to be present by default.
  31    getpeername and getsockname syscalls were also added for 32-bit in
  32    4.4, but only for 32-bit kernels, not in the compat syscall table
  33    for 64-bit kernels.  */
  34 #if !defined __arch64__ && __LINUX_KERNEL_VERSION < 0x040400
  35 # undef __ASSUME_SENDMSG_SYSCALL
  36 # undef __ASSUME_RECVMSG_SYSCALL
  37 # undef __ASSUME_ACCEPT_SYSCALL
  38 # undef __ASSUME_CONNECT_SYSCALL
  39 # undef __ASSUME_RECVFROM_SYSCALL
  40 # undef __ASSUME_SENDTO_SYSCALL
  41 # undef __ASSUME_GETSOCKOPT_SYSCALL
  42 # undef __ASSUME_SETSOCKOPT_SYSCALL
  43 #endif
  44
  45 /* These syscalls were added for both 32-bit and 64-bit in 4.4.  */
  46 #if __LINUX_KERNEL_VERSION < 0x040400
  47 # undef __ASSUME_BIND_SYSCALL
  48 # undef __ASSUME_LISTEN_SYSCALL
  49 #endif
  50
  51 #ifdef __arch64__
  52 /* sparc64 defines __NR_pause,  however it is not supported (ENOSYS).
  53    Undefine so pause.c can use a correct alternative.  */
  54 # undef __NR_pause
  55 #endif
  56
  57 /* sparc only supports ipc syscall before 5.1.  */
  58 #if __LINUX_KERNEL_VERSION < 0x050100
  59 # undef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
  60 # if !defined __arch64__
  61 #  undef __ASSUME_SYSVIPC_DEFAULT_IPC_64
  62 # endif
  63 #endif
  64
  65 /* Support for the renameat2 syscall was added in 3.16.  */
  66 #if __LINUX_KERNEL_VERSION < 0x031000
  67 # undef __ASSUME_RENAMEAT2
  68 #endif
  69
  70 /* SPARC kernel Kconfig does not define CONFIG_CLONE_BACKWARDS, however it
  71    has the same ABI as if it did, implemented by sparc-specific code
  72    (sparc_do_fork).
  73
  74    It also has a unique return value convention:
  75
  76      Parent -->  %o0 == child's  pid, %o1 == 0
  77      Child  -->  %o0 == parent's pid, %o1 == 1
  78
  79    Which required a special macro to correct issue the syscall
  80    (INLINE_CLONE_SYSCALL).  */
  81 #undef __ASSUME_CLONE_DEFAULT
  82 #define __ASSUME_CLONE_BACKWARDS        1