1  /* Set flags signalling availability of kernel features based on given
       2     kernel version number.  SPARC version.
       3     Copyright (C) 1999-2023 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  /* There syscalls were added for 32-bit in compat syscall table only
      46     in 4.20 (but present for 64-bit in all supported kernel versions).  */
      47  #if !defined __arch64__ && __LINUX_KERNEL_VERSION < 0x041400
      48  # undef __ASSUME_GETSOCKNAME_SYSCALL
      49  # undef __ASSUME_GETPEERNAME_SYSCALL
      50  #endif
      51  
      52  /* These syscalls were added for both 32-bit and 64-bit in 4.4.  */
      53  #if __LINUX_KERNEL_VERSION < 0x040400
      54  # undef __ASSUME_BIND_SYSCALL
      55  # undef __ASSUME_LISTEN_SYSCALL
      56  #endif
      57  
      58  #ifdef __arch64__
      59  /* sparc64 defines __NR_pause,  however it is not supported (ENOSYS).
      60     Undefine so pause.c can use a correct alternative.  */
      61  # undef __NR_pause
      62  #endif
      63  
      64  /* sparc only supports ipc syscall before 5.1.  */
      65  #if __LINUX_KERNEL_VERSION < 0x050100
      66  # undef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
      67  # if !defined __arch64__
      68  #  undef __ASSUME_SYSVIPC_DEFAULT_IPC_64
      69  # endif
      70  #endif
      71  
      72  /* Support for the renameat2 syscall was added in 3.16.  */
      73  #if __LINUX_KERNEL_VERSION < 0x031000
      74  # undef __ASSUME_RENAMEAT2
      75  #endif
      76  
      77  /* SPARC kernel Kconfig does not define CONFIG_CLONE_BACKWARDS, however it
      78     has the same ABI as if it did, implemented by sparc-specific code
      79     (sparc_do_fork).
      80  
      81     It also has a unique return value convention:
      82  
      83       Parent -->  %o0 == child's  pid, %o1 == 0
      84       Child  -->  %o0 == parent's pid, %o1 == 1
      85  
      86     Which required a special macro to correct issue the syscall
      87     (INLINE_CLONE_SYSCALL).  */
      88  #undef __ASSUME_CLONE_DEFAULT
      89  #define __ASSUME_CLONE_BACKWARDS	1