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authorDavid S. Miller <davem@davemloft.net>2012-04-17 16:08:29 -0400
committerDavid S. Miller <davem@davemloft.net>2012-04-17 16:08:29 -0400
commit7b56f76edf2da7ab3e356cc0db16f9af4c6a26e2 (patch)
tree655860580d081c983e643589e6f56cc1a01138f3 /arch/sparc/net
parentb3d7b2f2f07ff0ab87442f2d499f2860ef59bfaa (diff)
downloadlinux-7b56f76edf2da7ab3e356cc0db16f9af4c6a26e2.tar.gz
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/net')
-rw-r--r--arch/sparc/net/bpf_jit.h5
-rw-r--r--arch/sparc/net/bpf_jit_asm.S4
-rw-r--r--arch/sparc/net/bpf_jit_comp.c2
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