bpf: arm64: Indirect jumps #10307
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bpf: arm64: Indirect jumps #10307
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Add support for the instructions array map type in the arm64 JIT by calling bpf_prog_update_insn_ptrs() with the offsets that map xlated_offset to the jited_offset in the final image. arm64 JIT already has this offset array which was being used for bpf_prog_fill_jited_linfo() and can be used directly for bpf_prog_update_insn_ptrs. Signed-off-by: Puranjay Mohan <[email protected]> Reviewed-by: Anton Protopopov <[email protected]> Acked-by: Xu Kuohai <[email protected]>
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Add support for a new instruction BPF_JMP|BPF_X|BPF_JA, SRC=0, DST=Rx, off=0, imm=0 which does an indirect jump to a location stored in Rx. The register Rx should have type PTR_TO_INSN. This new type assures that the Rx register contains a value (or a range of values) loaded from a correct jump table – map of type instruction array. ARM64 JIT supports indirect jumps to all registers through the A64_BR() macro, use it to implement this new instruction. Signed-off-by: Puranjay Mohan <[email protected]> Reviewed-by: Anton Protopopov <[email protected]> Acked-by: Xu Kuohai <[email protected]>
arm64 JIT now supports gotox instruction and jumptables, so run tests in verifier_gotox.c for arm64. Signed-off-by: Puranjay Mohan <[email protected]> Reviewed-by: Anton Protopopov <[email protected]>
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Pull request for series with
subject: bpf: arm64: Indirect jumps
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1024226