the bits file is retained, but as a single generic version, to allow
for the unlikely future possibility of letting a new arch define
something differently.
- add mount_setattr from linux v5.12
- add epoll_pwait2 from linux v5.11
- add process_madvise from linux v5.10
- add __NR_faccessat2 from linux v5.8
- add pidfd_getfd and openat2 syscall numbers from linux v5.6
- add clone3 syscall number from linux v5.3
- add process_mrelease from linux v5.15
- add futex_waitv from linux v5.16
- add set_mempolicy_home_node from linux v5.17
- add cachestat from linux v6.4
- add __NR_fchmodat2 from linux v6.6
despite riscv32 being natively time64, the IPC_TIME64 bit (0x100) is
set in IPC_STAT and derived command macros, differentiating their
values from the raw command values used to interface with the kernel.
this reflects that the kernel ipc structure types are not natively
time64, but have broken-down hi/lo fields that cannot be used in-place
and require translation, and that the userspace struct types differ
from the kernel types (relevant to things like strace).
These are mostly copied from riscv64. _Addr and _Reg had to become int
to match compiler-controlled parts of the ABI (result type of sizeof,
etc.). There is no kernel stat struct; the userspace stat matches
glibc in the sizes and offsets of all fields (including glibc's
__dev_t __pad1). The jump buffer is 12 words larger to account for 12
saved double-precision floats; additionally it should be 64-bit
aligned to save doubles.
The syscall list was significantly revised by deleting all time32 and
pre-statx syscalls, and renaming several syscalls that have different
names depending on __BITS_PER_LONG, notably mmap2 and _llseek.
futex was added as an alias to futex_time64 since it is widely used by
software which does not pass time arguments.
