RFR: 8342607: Enhance register printing on x86_64 platforms [v6]

[Martin Doerr]

> There are some situations in which the XMM registers are relevant to understand errors. E.g. C2 compiler uses them to spill GPR values (see https://github.com/openjdk/jdk/blob/d6eddcdaf92f2352266ba519608879141997cd63/src/hotspot/cpu/x86/x86_64.ad#L1312), 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

Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:

  Enable on MUSL.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21615/files
  - new: https://git.openjdk.org/jdk/pull/21615/files/01d367f6..b949136b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21615&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21615&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21615.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21615/head:pull/21615

PR: https://git.openjdk.org/jdk/pull/21615