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The decision about whether a BPF register is on the stack or in a CPU register is detected at the top BPF insn processing level, and then percolated throughout the remainder of the code. Since we now use negative register values to represent stacked registers, we can detect where a BPF register is stored without restoring to carrying this additional metadata through all code paths. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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bpf_jit_32.c | ||
bpf_jit_32.h | ||
Makefile |