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| author | David S. Miller <davem@davemloft.net> | 2012-04-17 16:08:29 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-17 16:08:29 -0400 |
| commit | 7b56f76edf2da7ab3e356cc0db16f9af4c6a26e2 (patch) | |
| tree | 655860580d081c983e643589e6f56cc1a01138f3 /arch/sparc | |
| parent | b3d7b2f2f07ff0ab87442f2d499f2860ef59bfaa (diff) | |
| download | linux-7b56f76edf2da7ab3e356cc0db16f9af4c6a26e2.tar.bz2 | |
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@davemloft.net>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/net/bpf_jit.h | 5 | ||||
| -rw-r--r-- | arch/sparc/net/bpf_jit_asm.S | 4 | ||||
| -rw-r--r-- | 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 74f048be739c..05175be442fb 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 fdc69324aabc..46d8f59f14c5 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 86349cab60c5..ebc89809f585 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 |