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I am not making up the fact that I had a nightmare last night in which r12 (ARM IP register) was trying to kill me. I might have spent too long staring at kernel disassembly over the weekend.
Greg Tucker's profile photoJoe Zbiciak's profile photoJon Masters's profile photoNick Alcock's profile photo
Ah work dreams aren't they always fun? :)
It's not exactly clear how a register was personified, but it was mean I tell ya. Mean. Really, really ugly. And it wanted blood. So don't think I haven't had any scary audit-inspired nightmares, because I have. Complete with an actual cold sweat. FFS.
This is more weird than a dream of my colleague who was a C compiler, having a terrible headache every time he was unable to compile some crappy code.
Not the first ARM dream I have had. But the weirdest so far.
The frame pointer may cast aspersions but beware the return of the link register.
I had a bad dream that I was a fish for Tux...
I dunno. For me, certain registers in CP15 may as well be on Elm Street....
Well, that's true. But I (fortunately) wasn't directly worried about CP15 corruption in this case (I was last week, when I thought it was TLS corruption before I found it was IP actually and not the source of the TLS read). If that makes any sense to you, you also are spending too long with ARM kernels ;)
Looking forward to the demise of cp15 (see published v8 spec).
No it's the shadow registers that you have to worry about. r14_fiq hides where ordinary users can't find him waiting to trap you with the mysterious exception 0x14. Try not to dream about that tonight.
I soemtimes think FIQ should have been spelled with a different vowel. ;-)
+Greg Tucker Doesn't bother me. I prefer debugging userspace issues with a hardware debugger anyway ;) I just rewrite the cpsr to switch to whatever mode and then those registers are magically revealed.
Going to userspace and eschewing assembler doesn't help you. I got trapped in an infloop in elfutils nm(1) last night, round and round never stopping no no stop let me get OFF! (No guesses what I was debugging during the day.)

It's true what they say: toolchain and lowlevel stuff is dangerous to your sanity.
Uh-oh. I'm debugging an LLVM issue now...
Expect to have nightmares of intermediate representations with pointy teeth. (There's a reason it's called *bit*code.)
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