RFR: 8342607: Enhance register printing on x86_64 platforms

[Matthias Baesken]

On Mon, 21 Oct 2024 14:29:20 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> There are some situations in which the XMM registers are relevant to understand errors. E.g. C2 compiler uses them to spill GPR values, so they may contain Oops etc. We may consider searching and printing the content for Oops in a future RFE.
> I've implemented [JDK-8342607](https://bugs.openjdk.org/browse/JDK-8342607) such that linux and Windows show the same output format. (Skipped Intel-Mac because Apple has stopped shipping that platform. I don't have it and I'm not familiar with it.)
> 
> Example output (linux):
> 
> Registers:
> RAX=0x00007fea8bdb3000, RBX=0x00007fea8b48d5d4, RCX=0x00007fea8b4d2255, RDX=0x0000000000000340
> RSP=0x00007fea897d0b60, RBP=0x00007fea897d0b90, RSI=0x00007fea8b5f1448, RDI=0x00000000e0000000
> R8 =0x00007fea8b48d5d4, R9 =0x0000000000000006, R10=0x00007fea8bb4b500, R11=0x00007fea7cc2f120
> R12=0x0000000000000000, R13=0x00007fea897d0bc0, R14=0x00007fea897d0c50, R15=0x00007fea8402c9c0
> RIP=0x00007fea8ac008e5, EFLAGS=0x0000000000010246, CSGSFS=0x002b000000000033, ERR=0x0000000000000006
>   TRAPNO=0x000000000000000e
> 
> XMM[0]=0x0000000000000000 0x0000000000000000
> XMM[1]=0x00007fea3c034200 0x0000000000000000
> XMM[2]=0x00000000fffffffe 0x00007fea8402c9c0
> XMM[3]=0x00007fea7c3d6608 0x0000000000000000
> XMM[4]=0x00007f0000000000 0x0000000000000000
> XMM[5]=0x00007fea897d0fe8 0x00007feaffffffff
> XMM[6]=0x0000000000000000 0x00007fea897d0f98
> XMM[7]=0x0202020202020202 0x0000000000000000
> XMM[8]=0x0000000000000000 0x0202020202020202
> XMM[9]=0x666e69206e6f6974 0x0000000000000000
> XMM[10]=0x0000000000000000 0x6e6f6974616d726f
> XMM[11]=0x0000000000000001 0x0000000000000000
> XMM[12]=0x00007fea8b684400 0x0000000000000001
> XMM[13]=0x0000000000000000 0x0000000000000000
> XMM[14]=0x0000000000000000 0x0000000000000000
> XMM[15]=0x0000000000000000 0x0000000000000000
>   MXCSR=0x0000037f

Looks good to me, but I could live well without that indentation of the MXCSR value.

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PR Comment: https://git.openjdk.org/jdk/pull/21615#issuecomment-2428452656