I'm not sure if your solution is a complete solution for counting instructions
is enough. If I understand QEMU correct, it links TBs together, removing the
need to go through the tb_find_fast in many but not all situations.
However, you could disable the TB linking, done in tb_find_fast I think..., and
then your solution should be enough.
For detecting contidional and uncondiftional branches, you could alter the code
in translate.c to add information about the reason for why the TB was ended in
the TB struct.
Torbjörn
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Shane
Brennan
Sent: den 20 februari 2007 02:35
To: Andersson Torbjorn
Subject: RE: [Qemu-devel] Counting Instructions and Looking for
ConditionalBranches
Hi Torbjorn,
Thank you for the advice. I am currently counting instructions by
placing a counter in the cpu_exec function in cpu_exec.c
Everytime a new tb is grabbed from the tb_find_fast() function I update
the instruction counter. This seems to be an accurate instruction count. I am
also able to detect when branches and jumps occur by comparing the PCs of
consecutive tb's. However, I am currently unable to tell which of the
branch/jumps are conditional, and which are unconditional. Do you have any
advice on monitoring for unconditional branches?
Any advice you can provide me with would be greatly appreciate!
~Shane Brennan
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