tree ceef87990d31031cf3da6146678096bd86ba4cdf
parent 40b53b771806b1770837169cd32d1bf167fbccaf
author Masami Hiramatsu <mhiramat@kernel.org> 1524658857 +0900
committer Steven Rostedt (VMware) <rostedt@goodmis.org> 1539224351 -0400

x86: ptrace: Add function argument access API

Add regs_get_argument() which returns N th argument of the
function call.
Note that this chooses most probably assignment, in some case
it can be incorrect (e.g. passing data structure or floating
point etc.)

This is expected to be called from kprobes or ftrace with regs
where the top of stack is the return address.

Link: http://lkml.kernel.org/r/152465885737.26224.2822487520472783854.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>