riscv, bpf: Factor out emit_call for kernel and bpf context

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The current emit_call function is not suitable for kernel function call as
it store return value to bpf R0 register. We can separate it out for common
use. Meanwhile, simplify judgment logic, that is, fixed function address
can use jal or auipc+jalr, while the unfixed can use only auipc+jalr.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Acked-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/bpf/20230215135205.1411105-3-pulehui@huaweicloud.com

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Pu Lehui 2023-02-15 21:52:03 +08:00 • committed by Daniel Borkmann

parent 5e57fb7b0b

commit 0fd1fd0104

1 changed files with 13 additions and 17 deletions

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arch/riscv/net/bpf_jit_comp64.c

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