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

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[ Upstream commit 0fd1fd0104 ]

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
Stable-dep-of: 2f1b0d3d73 ("riscv, bpf: Sign-extend return values")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Pu Lehui 2023-02-15 21:52:03 +08:00 • committed by Greg Kroah-Hartman

parent 30a8354602

commit 72ae139546

1 changed files with 13 additions and 17 deletions

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arch/riscv/net/bpf_jit_comp64.c

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