Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instruction

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Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instruction

From:	Richard Henderson
Subject:	Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions
Date:	Wed, 11 Aug 2021 07:56:32 -1000
User-agent:	Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 8/11/21 4:57 AM, LIU Zhiwei wrote:

I still don't know why the value written sign-extended. If that's the the rule of finalspecification, I will try to obey it although our Linux will not depend on the high part.


The text that I'm looking at is

https://github.com/riscv/riscv-isa-manual/releases/download/Ratified-IMFDQC-and-Priv-v1.11/riscv-privileged-20190608.pdf

3.1.6.2 Base ISA Control in mstatus Register

In the fifth paragraph, the requirement for sign-extension is detailed.


r~

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[RFC PATCH 00/13] Support UXL field in mstatus, LIU Zhiwei, 2021/08/04
- [RFC PATCH 01/13] target/riscv: Add UXL to tb flags, LIU Zhiwei, 2021/08/04
  - Re: [RFC PATCH 01/13] target/riscv: Add UXL to tb flags, Alistair Francis, 2021/08/05
  - Re: [RFC PATCH 01/13] target/riscv: Add UXL to tb flags, Richard Henderson, 2021/08/05
    - Re: [RFC PATCH 01/13] target/riscv: Add UXL to tb flags, LIU Zhiwei, 2021/08/05
- [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, LIU Zhiwei, 2021/08/04
  - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, Richard Henderson, 2021/08/05
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, LIU Zhiwei, 2021/08/08
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, Richard Henderson, 2021/08/09
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, LIU Zhiwei, 2021/08/11
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, Richard Henderson <=
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, LIU Zhiwei, 2021/08/11
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, Richard Henderson, 2021/08/12
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, LIU Zhiwei, 2021/08/12
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, Richard Henderson, 2021/08/12
    - Re: [RFC PATCH 02/13] target/riscv: Support UXL32 for branch instructions, LIU Zhiwei, 2021/08/12
- [RFC PATCH 03/13] target/riscv: Support UXL32 on 64-bit cpu for load/store, LIU Zhiwei, 2021/08/04
  - Re: [RFC PATCH 03/13] target/riscv: Support UXL32 on 64-bit cpu for load/store, Richard Henderson, 2021/08/05
    - Re: [RFC PATCH 03/13] target/riscv: Support UXL32 on 64-bit cpu for load/store, LIU Zhiwei, 2021/08/08
- [RFC PATCH 04/13] target/riscv: Support UXL32 for slit/sltiu, LIU Zhiwei, 2021/08/04
  - Re: [RFC PATCH 04/13] target/riscv: Support UXL32 for slit/sltiu, Richard Henderson, 2021/08/05

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