powerpc/kprobes: Use ftrace to determine if a probe is at function entry

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Rather than hard-coding the offset into a function to be used to
determine if a kprobe is at function entry, use ftrace_location() to
determine the ftrace location within the function and categorize all
instructions till that offset to be function entry.

For functions that cannot be traced, we fall back to using a fixed
offset of 8 (two instructions) to categorize a probe as being at
function entry for 64-bit elfv2, unless we are using pcrel.

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Naveen N Rao <naveen@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/20241030070850.1361304-3-hbathini@linux.ibm.com

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Naveen N Rao 2024-10-30 12:38:35 +05:30 • committed by Michael Ellerman

parent 0b9846529e

commit be87d713ea

1 changed files with 8 additions and 10 deletions

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arch/powerpc/kernel/kprobes.c

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