riscv,entry: fix misaligned base for excp_vect_table
In RV64, the size of each entry in excp_vect_table is 8 bytes. If the base of the table is not 8-byte aligned, loading an entry in the table will raise a misaligned exception. Although such exception will be handled by opensbi/bbl, this still causes performance degradation. Signed-off-by: Zihao Yu <yuzihao@ict.ac.cn> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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