From: tturhan@cs.bilkent.edu.tr
To: gcc@gcc.gnu.org
Subject: Error Injection
Date: Sun, 01 Sep 2013 11:45:00 -0000 [thread overview]
Message-ID: <a5bc2c674019c3bdf17717f24afebfe5.squirrel@newmail.bilkent.edu.tr> (raw)
Hi,
I am a student at Bilkent Uni. in Turkey and using GCC as a tool for my
M.S. Thesis which is about Software Fault Tolerance.
I am stuck, in terms of implementing bit flips in the operands of a gimple
statement.
I need to inject bit flips to all kinds of operands, constant integers,
floats, variables, pointers etc...
It is simpler for constants, but I am having a hard time to get the value
of pointers and other variables.
My objective is to simply change the value of a tree operand, by injecting
a new instruction that changes the value or directly change the operand to
a bit flipped value.
For constant integers I did something like this:
int valueBefore = TREE_INT_CST_LOW(operands[i]);
int valueAfter = (valueBefore ^ (1u << 2)); tree number =
build_int_cst (integer_type_node, valueAfter);
I would love it if you can help me and
may even implement a tool for GCC for error injection purposes.
Any help would be much appreciated!
Thank you very much!
next reply other threads:[~2013-09-01 11:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-01 11:45 tturhan [this message]
2013-09-03 17:59 ` Modifying the values of Gimple Instruction Operands tturhan
2013-09-04 8:18 ` Richard Biener
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