On Friday, September 19, 2003, at 07:13 AM, Christos Zoulas wrote:
On Sep 19, 10:08am, perry%piermont.com@localhost ("Perry E. Metzger") wrote:
-- Subject: Re: CVS commit: src/sys/arch/alpha
If there are technical reasons for not putting PT_STEP in the
kernel, another way would be to put it in the libc ptrace() stub, so
that it is available for other applications.
Jason, what do you think about that?
I think it's wrong. I think that if breakpoint-based stepping is going to happen, then the debugger should KNOW that, and have explicit control over it.
For example, if the kernel writes over an instruction word, and the debugger doesn't know about it, you have no way to properly disassemble the function you're stepping through. On the other hand, if the debugger writes over an instruction word, it has a record of it, and can compensate during disassembly.
-- Jason R. Thorpe <thorpej%wasabisystems.com@localhost>