Messages in this thread | | | From | Björn Töpel <> | Subject | Re: [PATCH v5 4/9] riscv/kprobe: Add common RVI and RVC instruction decoder code | Date | Wed, 04 Jan 2023 09:57:11 +0100 |
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"liaochang (A)" <liaochang1@huawei.com> writes:
>> Shouldn't the mask be 0xf003? > > Actually, the mask should be 0xf003 indeedly, but it also bring another problem that > it can't tell C.MV and C.JR via the mask and value parts. Look opcodes below: > > 15 14 13 12 | 11 10 9 8 | 7 6 5 4 | 3 2 1 0 > C.JR: 1 0 0 0 | rs1 0 1 0 > C.MV: 1 0 0 0 | rd rs2 1 0 > > The only differece between C.MV and C.JR is the bits[2~6], these bitfield of C.JR is zero, > the ones of C.MV is rs2 which never be zero. In order to tell C.MV and C.JR correclty, it > is better to adjust the mask of C.JR to be 0xf07f as your patch(riscv, kprobe: Stricter c.jr/c.jalr decoding) > > Looking forward to your feedback.
Yup, that was the reason I submitted the fix! Let's wait for the fix to be applied, and not include that fix in your feature series.
Björn
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