This is the mail archive of the
gdb@sourceware.org
mailing list for the GDB project.
Dump values from FPU after each operation
- From: Thomas Baruchel <baruchel at gmx dot com>
- To: gdb at sourceware dot org
- Date: Fri, 4 Nov 2011 09:14:35 +0100 (CET)
- Subject: Dump values from FPU after each operation
- Reply-to: baruchel at gmx dot com
Hi, I have a compiled program with no debugging symbol (and no source if
you want to ask). I would like to know how some floating point value is
made of, and since I know what value I am looking for, I think one easy
way would be to lauch the program and to have on the standard output the
content of the FPU after each operation; I am aware it will be a huge
amount of value, but since I know which value is expected, I could
probably parse this output to grep (with -A / -B options in order to extract
100 lines around the exact matching). But is it possible to do such a thing?
I am aware that dumping these registers will not tell me the operations,
but this is not a big issue; I can probably guess it once I know the
involved floating-point values.
If the data can't be redirect to standard output, I can save it, this is not
the most important. Regards,
--
Thomas Baruchel