tree 301294142ae65e4646281329737fa349190d7565
parent f03fb3f455c6c3a3dfcef6c7f2dcab104c813f4b
author Jan Seiffert <kaffeemonster@googlemail.com> 1333085045 +0000
committer David S. Miller <davem@davemloft.net> 1333490501 -0400

bpf jit: Let the x86 jit handle negative offsets

Now the helper function from filter.c for negative offsets is exported,
it can be used it in the jit to handle negative offsets.

First modify the asm load helper functions to handle:
- know positive offsets
- know negative offsets
- any offset

then the compiler can be modified to explicitly use these helper
when appropriate.

This fixes the case of a negative X register and allows to lift
the restriction that bpf programs with negative offsets can't
be jited.

Signed-of-by: Jan Seiffert <kaffeemonster@googlemail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>