net: filter: Fix some more small issues in sparc JIT.
Fix mixed space and tabs.
Put bpf_jit_load_*[] externs into bpf_jit.h
"while(0)" --> "while (0)"
"COND (X)" --> "COND(X)"
Document branch offset calculations, and bpf_error's return
sequence.
Document the reason we need to emit three nops between the
%y register write and the divide instruction.
Remove erroneous trailing semicolons from emit_read_y() and
emit_write_y().
Based upon feedback from Sam Ravnborg.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/net/bpf_jit_asm.S b/arch/sparc/net/bpf_jit_asm.S
index 46d8f59..9d016c7 100644
--- a/arch/sparc/net/bpf_jit_asm.S
+++ b/arch/sparc/net/bpf_jit_asm.S
@@ -195,5 +195,11 @@
sll r_OFF, 2, r_X
bpf_error:
+ /* Make the JIT program return zero. The JIT epilogue
+ * stores away the original %o7 into r_saved_O7. The
+ * normal leaf function return is to use "retl" which
+ * would evalute to "jmpl %o7 + 8, %g0" but we want to
+ * use the saved value thus the sequence you see here.
+ */
jmpl r_saved_O7 + 8, %g0
clr %o0