arm64: signal: share lp64 signal structures and routines to ilp32

maillist inclusion
category: feature
bugzilla: 46790
CVE: NA

Reference: https://github.com/norov/linux/commits/ilp32-5.2



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Following patches of the series introduce ILP32-specific structures and
handlers for signal subsystem. In this patch, functions and structures
that common for LP64 and ILP32 are moved to
arch/arm64/include/asm/signal_common.h to let ILP32 code reuse them. Some
functions work with struct rt_sigframe which differs for ILP32. Therefore,
to let ILP32 generate correct code, body of that functions are moved to
arch/arm64/include/asm/signal_common.h. Others just declared in new header.

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
Signed-off-by: Yury Norov <ynorov@marvell.com>

 Conflicts:
	arch/arm64/kernel/signal.c

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Acked-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Chen Jun <chenjun102@huawei.com>