mcause is different between xiangshan and spike when execute sh.

[ha0lyu]

I have tested it in the newest version, it works! No more mstatus different for now.
However, this test case raise mcause different:

sh      s2, 1259(s0)   # test case
-------------------
privilegeMode: 3
 mcause different at pc = 0x0080000030, right= 0x0000000000000007, wrong = 0x0000000000000006

I ran this test case, the mcause value is 6 in the official spike, which is the same as XiangShan. But in spike-diff, it is 7, nemu-diff reported nothing.

Thanks.

Originally posted by @ha0lyu in #3860 (comment)

NEMU HIT GOOD TRAP:mcause-nemu.log
spike-so raise different:mcause-spike.log

To Reproduce

sh      s2, 1259(s0

Environment
XiangShan branch: master
XiangShan commit id: 011f1eff
NEMU commit id: b9507fbc
SPIKE commit id: