From: Richard Mortimer <richm@xxxxxxxxxxxxxxx> Date: Tue, 17 Apr 2012 19:59:57 +0100 > A few points below. Mainly a couple of comments that do not match the > code itself. I didn't spot any errors in the assembler generation > itself. Thanks Richard, I've committed (after testing) the following based upon your feedback. -------------------- net: filter: Fix some minor issues in sparc JIT. Correct conventions comments. %o4 and %o5 were swapped, %g3 was not documented. Use r_TMP instead of r_SKB_DATA + r_OFF where possible in assembler stubs. Correct discussion of %o4 and %o5 in one of bpf_jit_compile()'s comments. Based upon feedback from Richard Mortimer. Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> --- arch/sparc/net/bpf_jit.h | 5 +++-- arch/sparc/net/bpf_jit_asm.S | 4 ++-- arch/sparc/net/bpf_jit_comp.c | 2 +- 3 files changed, 6 insertions(+), 5 deletions(-) diff --git a/arch/sparc/net/bpf_jit.h b/arch/sparc/net/bpf_jit.h index 74f048b..05175be 100644 --- a/arch/sparc/net/bpf_jit.h +++ b/arch/sparc/net/bpf_jit.h @@ -4,13 +4,14 @@ /* Conventions: * %g1 : temporary * %g2 : Secondary temporary used by SKB data helper stubs. + * %g3 : packet offset passed into SKB data helper stubs. * %o0 : pointer to skb (first argument given to JIT function) * %o1 : BPF A accumulator * %o2 : BPF X accumulator * %o3 : Holds saved %o7 so we can call helper functions without needing * to allocate a register window. - * %o4 : skb->data - * %o5 : skb->len - skb->data_len + * %o4 : skb->len - skb->data_len + * %o5 : skb->data */ #ifndef __ASSEMBLER__ diff --git a/arch/sparc/net/bpf_jit_asm.S b/arch/sparc/net/bpf_jit_asm.S index fdc6932..46d8f59 100644 --- a/arch/sparc/net/bpf_jit_asm.S +++ b/arch/sparc/net/bpf_jit_asm.S @@ -30,7 +30,7 @@ bpf_jit_load_word_positive_offset: bne load_word_unaligned nop retl - ld [r_SKB_DATA + r_OFF], r_A + ld [r_TMP], r_A load_word_unaligned: ldub [r_TMP + 0x0], r_OFF ldub [r_TMP + 0x1], r_TMP2 @@ -59,7 +59,7 @@ bpf_jit_load_half_positive_offset: bne load_half_unaligned nop retl - lduh [r_SKB_DATA + r_OFF], r_A + lduh [r_TMP], r_A load_half_unaligned: ldub [r_TMP + 0x0], r_OFF ldub [r_TMP + 0x1], r_TMP2 diff --git a/arch/sparc/net/bpf_jit_comp.c b/arch/sparc/net/bpf_jit_comp.c index 86349ca..ebc8980 100644 --- a/arch/sparc/net/bpf_jit_comp.c +++ b/arch/sparc/net/bpf_jit_comp.c @@ -378,7 +378,7 @@ void bpf_jit_compile(struct sk_filter *fp) emit_clear(r_X); /* If this filter needs to access skb data, - * load %o4 and %o4 with: + * load %o4 and %o5 with: * %o4 = skb->len - skb->data_len * %o5 = skb->data * And also back up %o7 into r_saved_O7 so we can -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
