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49bb7cea24
Add a JumpIfX instruction which implements conditional jumps using
RegA and RegX. This is in addition to the pre-existing JumpIf
instruction which uses RegA and K.
This instruction / addressing mode is not mentionned in the original BPF
paper, but is supported by tools like bpf_asm, and has recently been
added to the kernel's filter.txt.
Simplify some of the parsing logic, and add a separate helper for
checking for "fake" JumpIfs.
Add JumpIfX support to the BPF vm.
Update testdata with JumpIfX instructions, and add tests
for both the assembler/disassembler and vm.
Fixes golang/go#27814
Change-Id: I0c3f6ac7eb5b4cd4d9c5af8784ee2e8d25195a0a
GitHub-Last-Rev: 39a88165b2
GitHub-Pull-Request: golang/net#20
Reviewed-on: https://go-review.googlesource.com/c/136895
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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