Messages in this thread | | | Date | Wed, 5 Jul 2000 15:10:45 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [patch] 2.4.0-test2: %cr4 in a register dump |
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On Wed, 5 Jul 2000, Brian Gerst wrote:
> Linus Torvalds wrote: > > If I remember correctly, there are CPU's out there that will bomb out > > horribly when you access %cr4 if the register doesn't exist. > > > > Do I remember wrong? > > > > I'd certainly agree with printing out cr4 even if it would be zero, I just > > disagree very much with adding a register read to the dump output that may > > cause an infinite regression of traps.. > > > > Linus > > How about just trapping the illegal opcode exception then? (patch > untested)
Looks fine. Me likee, except for the fact that you should clear %0 (otherwise you'll have random crap in the "cr4" variable after a trap - I realize that you zeroed the variable on a C source level, but gcc thinks that your asm-statement will overwrite it, so ...)
Linus
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