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Implement fsession support in the arm64 BPF JIT trampoline. Extend the trampoline stack layout to store function metadata and session cookies, and pass the appropriate metadata to fentry and fexit programs. This mirrors the existing x86 behavior and enables session cookies on arm64. Acked-by: Puranjay Mohan <puranjay@kernel.org> Tested-by: Puranjay Mohan <puranjay@kernel.org> Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Link: https://lore.kernel.org/r/20260131144950.16294-3-leon.hwang@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>