Messages in this thread | | | Date | Thu, 24 Apr 2003 09:59:58 -0400 | From | Chuck Ebbert <> | Subject | Re: [ANNOUNCE] desc.c -- dump the i386 descriptor tables |
| |
Gabriel Paubert wrote:
> > #31: base=c0355600 limit=00eb flags=0089 <G=0 P=1 S=0 DPL=0 Available TSS> > > Nice but the limit field is 20 bits (shifted left by 12 bits if G=1).
Huh. The diagram I used was blank where the upper four limit bits belong so I assumed it was unused... and for some reason I was thinking you shifted left by 16 bits when G=1, so I never noticed the missing four bits. Thanks.
> Other suggestions left as an exercise to the reader: > > a) distinguish 16 bit code from 32 bit code (GDT entry #19 is 16 bit code),
BIOS?
> b) distinguish read/write from read-only and execute/read from > execute-only (are there any read-only or execute-only segments in the GDT?) > > c) distinguish 16 and 32 bit expand down data (changes the upper > limit of the valid addresses, but it's never used in the GDT, so like > the conformant code it's not that important)
I now have it dumping LDTs, and should probably do at least cs:eip and eflags for each task.
> d) extend this for x86-64 :-)
Itanium. 8)
------ Chuck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |