RFR: JDK-8288824: [arm32] Display isetstate in register output

[Sergey Nazarkin]

On Tue, 5 Jul 2022 18:42:08 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> When analyzing [JDK-8288719](https://bugs.openjdk.org/browse/JDK-8288719), to know the current isetstate was useful. It would be nice if that were printed clearly in the register output to save some mental cycles parsing CPSR.
>> 
>> Looks like this:
>> 
>> Registers:
>>   r0  = 0x00000000
>>   r1  = 0xbe9e7fb8
>>   r2  = 0x00000000
>>   r3  = 0xb6f860ac
>>   r4  = 0xbe9e7fb8
>>   r5  = 0xb6f864e0
>>   r6  = 0xbe9e8060
>>   r7  = 0xbe9e7fb0
>>   r8  = 0xb6da8798
>>   r9  = 0x00000000
>>   r10 = 0x00000000
>>   fp  = 0x00000001
>>   r12 = 0xb6da87ec
>>   sp  = 0xbe9e7fb0
>>   lr  = 0xb6bc7dfb
>>   pc  = 0xb6bc7dfa
>>   cpsr = 0x800e0030
>> isetstate: Thumb
>> 
>> Registers:
>>   r0  = 0xb6be3664
>>   r1  = 0xbe947c70
>>   r2  = 0x00000058
>>   r3  = 0xb6f3e000
>>   r4  = 0xbe947c70
>>   r5  = 0xb6f3f510
>>   r6  = 0xb6c95bdc
>>   r7  = 0xbe947d18
>>   r8  = 0xbe947d98
>>   r9  = 0x00000000
>>   r10 = 0x00000000
>>   fp  = 0xbe947d14
>>   r12 = 0xb6c95f84
>>   sp  = 0xbe947c68
>>   lr  = 0xb6e97218
>>   pc  = 0xb6793f3c
>>   cpsr = 0x60000010
>> isetstate: ARM 
>> 
>> 
>> I refrained from parsing more information from the CPSR because I did not want to blow up the patch. ISETSTATE proved to be useful. More information can be added if needed.
>
> @snazarkin could you take a look? Its a small patch, and there are not many arm32 reviewers around it seems. Thanks!

@tstuefe Good idea, thank you. LGTM

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PR: https://git.openjdk.org/jdk/pull/9223