On 2019/2/6 下午8:01, Huacai Chen wrote:
From: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
The original patch is from Ralf. I have maintained it for more than six
years on Loongson platform, and it works perfectly. Most of the commit
messages are written by Ralf.
MIPS doesn't quite fit into the existing pattern of other architectures
and I'd appreciate your comments and maybe even an Acked-by.
- Linux on MIPS extends the traditional syscall table used by older UNIX
implementations. This is why 32-bit Linux syscalls are starting from
4000; the native 64-bit syscalls start from 5000 and the N32 compat ABI
from 6000. The existing syscall bitmap is only large enough for at most
2048 syscalls, so I had to increase AUDIT_BITMASK_SIZE to 256 which
provides enough space for 8192 syscalls. Because include/uapi/linux/
audit.h and AUDIT_BITMASK_SIZE are exported to userspace I've used an
#ifdef __mips__ for this.
- The code treats the little endian MIPS architecture as separate from
big endian. Combined with the 3 ABIs that's 6 combinations. I tried
to sort of follow the example set by ARM which explicitly lists the
(rare) big endian architecture variant - but it doesn't seem to very
useful so I wonder if this could be squashed to just the three ABIs
without consideration of endianess?
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Reviewed-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Any update about this patch?
Thanks.
--
Jiaxun Yang
