riscv: u64ilp32: Add signal support for compat
The u64ilp32 reuses compat mode on the 64-bit Linux kernel, but the signal context is the same as the native 64-bit, not u32ilp32. So use the native signal procedure for u64ilp32 applications. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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