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814cba835e
btf_distill_func_proto() accepts a function argument up to 16 bytes, so a
128-bit scalar such as __int128 reaches the x86 trampoline with
arg_size == 16. But the current implementation assumes an __int128
argument only needs one register, so the register save area is
under-allocated and save_args() overwrites adjacent stack slots.
Compute the register count from arg_size for all arguments to fix it.
Fixes: a9c5ad31fb ("bpf: x86: Support in-register struct arguments in trampoline programs")
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/bpf/20260729050204.2586457-1-yonghong.song@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>