riscv: s64ilp32: Add u32ilp32 ptrace support
The s64ilp32 supports both u64ilp32 and u32ilp32 ABIs, and their pt_regs differ. So introduce the compat feature to help u32ilp32 ABI. Now u64ilp32 and u32ilp32 applications could work with the s64ilp32 Linux ptrace concurrently. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org>
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