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authorJan Seiffert <kaffeemonster@googlemail.com>2012-04-29 23:02:19 +0400
committerDavid S. Miller <davem@davemloft.net>2012-04-30 21:40:50 +0400
commit05be18241e83d2ac6b656c8f924e74b3998c173f (patch)
tree4f0637e3fb5116fa259130b75a5dfdcb3e3335e7 /arch/powerpc/net/bpf_jit.h
parent518fbf9cdf17875d808596afd77fc115a6f942ca (diff)
downloadlinux-05be18241e83d2ac6b656c8f924e74b3998c173f.tar.xz
bpf jit: Let the powerpc 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. Tested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Jan Seiffert <kaffeemonster@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/powerpc/net/bpf_jit.h')
-rw-r--r--arch/powerpc/net/bpf_jit.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index af1ab5e9a691..5c3cf2d04e41 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -48,7 +48,13 @@
/*
* Assembly helpers from arch/powerpc/net/bpf_jit.S:
*/
-extern u8 sk_load_word[], sk_load_half[], sk_load_byte[], sk_load_byte_msh[];
+#define DECLARE_LOAD_FUNC(func) \
+ extern u8 func[], func##_negative_offset[], func##_positive_offset[]
+
+DECLARE_LOAD_FUNC(sk_load_word);
+DECLARE_LOAD_FUNC(sk_load_half);
+DECLARE_LOAD_FUNC(sk_load_byte);
+DECLARE_LOAD_FUNC(sk_load_byte_msh);
#define FUNCTION_DESCR_SIZE 24