* [Linux-ia64] ptrace and system call interception
@ 2000-06-06 5:08 Jeff Dike
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From: Jeff Dike @ 2000-06-06 5:08 UTC (permalink / raw)
To: linux-ia64
I'm looking into porting the user-mode kernel port (see
http://user-mode-linux.sourceforge.net) to IA64. This depends heavily on
ptrace's system call interception and modification abilities.
I need to be able to annull system calls by changing the system call number (I
use __NR_getpid). My reading of entry.S, and running some test code, says
that this doesn't work. Can this be added without too much difficulty? If
so, can sourceforge (or intel - whoever owns the protos available through
sourceforge) be persuaded to update without too much difficulty :-)
Another thing that's not obvious is where the system call arguments are
stored. I can locate the system call number (PT_R15) and its return value
(PT_R8) without too much difficulty, but I don't see the arguments.
Thanks, Jeff
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2000-06-06 5:08 [Linux-ia64] ptrace and system call interception Jeff Dike
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