bpf, riscv: Implement bpf_addr_space_cast instruction

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LLVM generates bpf_addr_space_cast instruction while translating
pointers between native (zero) address space and
__attribute__((address_space(N))). The addr_space=0 is reserved as
bpf_arena address space.

rY = addr_space_cast(rX, 0, 1) is processed by the verifier and
converted to normal 32-bit move: wX = wY

rY = addr_space_cast(rX, 1, 0) has to be converted by JIT.

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Tested-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20240404114203.105970-3-puranjay12@gmail.com

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Puranjay Mohan 2024-04-04 11:42:03 +00:00 • committed by Daniel Borkmann

parent 633a6e01d1

commit 21ab0b6d0c

3 changed files with 16 additions and 0 deletions

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1

arch/riscv/net/bpf_jit.h

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14

arch/riscv/net/bpf_jit_comp64.c

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1

arch/riscv/net/bpf_jit_core.c

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