Re: ptrace on i386

From: Manfred Spraul (manfred@colorfullife.com)
Date: Sat Dec 01 2001 - 05:46:26 EST

Next message: Jeff V. Merkey: "Re: Journaling pointless with today's hard disks?"
Previous message: Pavel Machek: "Status of patrick's new device/driver model"
Maybe in reply to: Frank Cornelis: "ptrace on i386"
Next in thread: Brian Gerst: "Re: ptrace on i386"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

>
> In linux/arch/i386/kernel/ptrace.c next code is being used in the xxxreg
> functions:
> if (regno > GS*4)
> regno -= 2*4;
> Why this discontinuity?

Backward compatibility. The syscall entry point changed between 2.0 and 2.2, but
that change must remain invisible to user space apps. the "-= 2*4" converts old offsets
to new offsets (or the other way around)

-- Manfred

- 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/

Next message: Jeff V. Merkey: "Re: Journaling pointless with today's hard disks?"
Previous message: Pavel Machek: "Status of patrick's new device/driver model"
Maybe in reply to: Frank Cornelis: "ptrace on i386"
Next in thread: Brian Gerst: "Re: ptrace on i386"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Fri Dec 07 2001 - 21:00:15 EST