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x86: ptrace: Add function argument access API

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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 <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
This commit is contained in:
Masami Hiramatsu 2018-04-25 21:20:57 +09:00 • committed by Steven Rostedt (VMware)
commit 3c88ee194c
3 changed files with 46 additions and 0 deletions
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7
arch/Kconfig
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@ -290,6 +290,13 @@ config HAVE_RSEQ
This symbol should be selected by an architecture if it
supports an implementation of restartable sequences.
config HAVE_FUNCTION_ARG_ACCESS_API
bool
help
This symbol should be selected by an architecure if it supports
the API needed to access function arguments from pt_regs,
declared in asm/ptrace.h
config HAVE_CLK
bool
help