From: Zihao Yu <[email protected]> [ Upstream commit ac8d0b901f0033b783156ab2dc1a0e73ec42409b ]
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 <[email protected]> Reviewed-by: Anup Patel <[email protected]> Signed-off-by: Palmer Dabbelt <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- arch/riscv/kernel/entry.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index 8ca479831142..9c87ae77ad5d 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -387,6 +387,7 @@ ENTRY(__switch_to) ENDPROC(__switch_to) .section ".rodata" + .align LGREG /* Exception vector table */ ENTRY(excp_vect_table) RISCV_PTR do_trap_insn_misaligned -- 2.30.2
