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Re: [PATCH 06/20] target/loongarch: Add main translation routines


From: Song Gao
Subject: Re: [PATCH 06/20] target/loongarch: Add main translation routines
Date: Wed, 30 Jun 2021 09:04:42 +0800
User-agent: Mozilla/5.0 (X11; Linux mips64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Hi, Alex,

On 06/29/2021 08:26 PM, Alex Bennée wrote:
> 
> Song Gao <gaosong@loongson.cn> writes:
> 
>> Hi, Philippe,
>>
>> On 06/29/2021 02:46 AM, Philippe Mathieu-Daudé wrote:
>>> On 6/28/21 2:04 PM, Song Gao wrote:
>>>> This patch add main translation routines and
>>>> basic functions for translation.
>>>>
>>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>>> ---
>>>>  target/loongarch/helper.h    |  10 +
>>>>  target/loongarch/op_helper.c |  28 +++
>>>>  target/loongarch/translate.c | 537 
>>>> +++++++++++++++++++++++++++++++++++++++++++
>>>>  target/loongarch/translate.h |  58 +++++
>>>>  4 files changed, 633 insertions(+)
>>>>  create mode 100644 target/loongarch/helper.h
>>>>  create mode 100644 target/loongarch/op_helper.c
>>>>  create mode 100644 target/loongarch/translate.c
>>>>  create mode 100644 target/loongarch/translate.h
>>>
>>>> +/* 128 and 256 msa vector instructions are not supported yet */
>>>> +static bool decode_lsx(uint32_t opcode)
>>>> +{
>>>> +    uint32_t value = (opcode & 0xff000000);
>>>> +
>>>> +    if ((opcode & 0xf0000000) == 0x70000000) {
>>>> +        return true;
>>>> +    } else if ((opcode & 0xfff00000) == 0x38400000) {
>>>> +        return true;
>>>> +    } else {
>>>> +        switch (value) {
>>>> +        case 0x09000000:
>>>> +        case 0x0a000000:
>>>> +        case 0x0e000000:
>>>> +        case 0x0f000000:
>>>> +        case 0x2c000000:
>>>> +        case 0x30000000:
>>>> +        case 0x31000000:
>>>> +        case 0x32000000:
>>>> +        case 0x33000000:
>>>> +            return true;
>>>> +        }
>>>> +    }
>>>> +    return false;
>>>> +}
>>>
>>> Why not generate that with the decodetree script?
>>>
>> These instructions are privileged instructions, user mode does not need 
>> these instructions.
>> I'll delete these codes.
> 
> Are you intending to include system emulation in due course?
> 
Yes,  After the loongarch kernel is submitted to the mainline, we will add 
system emulation support.
You can see the lastest loongarch kernel at:

    https://github.com/loongson/linux/tree/loongarch-next

thanks




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