Thanks Aidan,
Yes, that's what myself and my colleague imagined: i.e. s is a regular
"execute next instruction then stop" step, and i somehow advances the
clock, possibly stepping within a single multi-word instruction. The
reason why I was puzzled, and hence why I reached out, was because I
couldn't see any regular (gdb) command-line that would actually make use
of this (that is the i packet), given our interpretation.
Anyway,
thanks again
Matt
Aidan Dodds wrote:
Hi Matthew,
This link seems to give some details:
http://davis.lbl.gov/Manuals/GDB/gdb_31.html
cycle step *(draft)* |i|addr|,|nnn Step the remote target by a
single clock cycle. If |,|nnn is present, cycle step nnn cycles. If
addr is present, cycle step starting at that address.
Where as:
step |s|addr addr is address to resume. If addr is omitted, resume
at same address.
I believe that step should execute one whole machine instruction or
one instruction packet depending on the architecture. The S command
should step into call instructions, not over. Stepping over anything
is a task for the debugger, and is managed by coordinating
breakpoints, stepping and continuing.
I cant imagine the 'i' command is commonly supported however since I
presume it would require very complex and tight coupling between the
processor running the stub and the processor being debugged as the
clock is not typical accessible. For regular source level debugging
this level of control is not typical required.
Thanks,
Aidan
On 19/08/2014 13:59, Matthew Gardiner wrote:
Sorry, I should have been more direct in this post...
Does anyone actually know the difference in the GDB-RSP i and s
commands?
I'd welcome your insight.
thanks
Matt
Matthew Gardiner wrote:
Hi Folks,
I'm poring over the gdb pdf trying to understand the difference
between the s and i commands.
After chatting with a colleague we came up with 2 ideas:
1. i means a single instruction step, and s is an instruction step
but step over CALL instructions.
OR
2. i means advance the clock once, i.e. by a single word in a
multi-word instruction. And s means a single instruction step.
All comments welcome!
thanks
Matt
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