7b56f76edf
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>
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#ifndef _BPF_JIT_H
|
|
#define _BPF_JIT_H
|
|
|
|
/* 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->len - skb->data_len
|
|
* %o5 : skb->data
|
|
*/
|
|
|
|
#ifndef __ASSEMBLER__
|
|
#define G0 0x00
|
|
#define G1 0x01
|
|
#define G3 0x03
|
|
#define G6 0x06
|
|
#define O0 0x08
|
|
#define O1 0x09
|
|
#define O2 0x0a
|
|
#define O3 0x0b
|
|
#define O4 0x0c
|
|
#define O5 0x0d
|
|
#define SP 0x0e
|
|
#define O7 0x0f
|
|
#define FP 0x1e
|
|
|
|
#define r_SKB O0
|
|
#define r_A O1
|
|
#define r_X O2
|
|
#define r_saved_O7 O3
|
|
#define r_HEADLEN O4
|
|
#define r_SKB_DATA O5
|
|
#define r_TMP G1
|
|
#define r_TMP2 G2
|
|
#define r_OFF G3
|
|
#else
|
|
#define r_SKB %o0
|
|
#define r_A %o1
|
|
#define r_X %o2
|
|
#define r_saved_O7 %o3
|
|
#define r_HEADLEN %o4
|
|
#define r_SKB_DATA %o5
|
|
#define r_TMP %g1
|
|
#define r_TMP2 %g2
|
|
#define r_OFF %g3
|
|
#endif
|
|
|
|
#endif /* _BPF_JIT_H */
|