Re: [PATCH 1/2] hw/mips: bootloader: Fix write_ulong

[Jiaxun Yang]

在2021年12月2日十二月 下午6:01，Philippe Mathieu-Daudé写道：
> On 12/2/21 11:51, Jiaxun Yang wrote:
>> 在2021年11月30日十一月 下午9:52，Philippe Mathieu-Daudé写道：
>>> On 11/30/21 22:17, Jiaxun Yang wrote:
>>>> bl_gen_write_ulong uses sd for both 32 and 64 bit CPU,
>>>> while sd is illegal on 32 bit CPUs.
>>>>
>>>> Replace sd with sw on 32bit CPUs.
>>>>
>>>> Fixes: 3ebbf86 ("hw/mips: Add a bootloader helper")
>>>> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
>>>> ---
>>>> Should be backported to 6.0 onwards.
>>>> ---
>>>>  hw/mips/bootloader.c | 6 +++++-
>>>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/hw/mips/bootloader.c b/hw/mips/bootloader.c
>>>> index 6ec8314490..99991f8b2b 100644
>>>> --- a/hw/mips/bootloader.c
>>>> +++ b/hw/mips/bootloader.c
>>>> @@ -182,7 +182,11 @@ void bl_gen_write_ulong(uint32_t **p, target_ulong 
>>>> addr, target_ulong val)
>>>>  {
>>>>      bl_gen_load_ulong(p, BL_REG_K0, val);
>>>>      bl_gen_load_ulong(p, BL_REG_K1, addr);
>>>> -    bl_gen_sd(p, BL_REG_K0, BL_REG_K1, 0x0);
>>>> +    if (bootcpu_supports_isa(ISA_MIPS3)) {
>>>> +        bl_gen_sd(p, BL_REG_K0, BL_REG_K1, 0x0);
>>>> +    } else {
>>>> +        bl_gen_sw(p, BL_REG_K0, BL_REG_K1, 0x0);
>>>> +    }
>>>
>>> We have bl_gen_load_ulong(); having bl_gen_store_ulong()
>>> would make the API even. Mind sending a patch? Otherwise:
>> 
>> Should I revisit this set or start another patch?
>
> Another patch :)

Just revisited the code and bl_gen_load_ulong means load a target_ulong
immedaite number, not load from memory so it's not even.

I'd leave it as is.

Thanks.

-- 
- Jiaxun