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When verifier sees a timed may_goto instruction, it emits a call to arch_bpf_timed_may_goto() with a stack offset in BPF_REG_AX (arm64 r9) and expects a count value to be returned in the same register. The verifier doesn't save or restore any registers before emitting this call. arch_bpf_timed_may_goto() should act as a trampoline to call bpf_check_timed_may_goto() with AAPCS64 calling convention. To support this custom calling convention, implement arch_bpf_timed_may_goto() in assembly and make sure BPF caller saved registers are saved and restored, call bpf_check_timed_may_goto with arm64 calling convention where first argument and return value both are in x0, then put the result back into BPF_REG_AX before returning. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Acked-by: Xu Kuohai <xukuohai@huawei.com> Link: https://lore.kernel.org/r/20250827113245.52629-2-puranjay@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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