arch/sparc/net/bpf_jit.h

   1 #ifndef _BPF_JIT_H
   2 #define _BPF_JIT_H
   3
   4 /* Conventions:
   5  *  %g1 : temporary
   6  *  %g2 : Secondary temporary used by SKB data helper stubs.
   7  *  %g3 : packet offset passed into SKB data helper stubs.
   8  *  %o0 : pointer to skb (first argument given to JIT function)
   9  *  %o1 : BPF A accumulator
  10  *  %o2 : BPF X accumulator
  11  *  %o3 : Holds saved %o7 so we can call helper functions without needing
  12  *        to allocate a register window.
  13  *  %o4 : skb->len - skb->data_len
  14  *  %o5 : skb->data
  15  */
  16
  17 #ifndef __ASSEMBLER__
  18 #define G0              0x00
  19 #define G1              0x01
  20 #define G3              0x03
  21 #define G6              0x06
  22 #define O0              0x08
  23 #define O1              0x09
  24 #define O2              0x0a
  25 #define O3              0x0b
  26 #define O4              0x0c
  27 #define O5              0x0d
  28 #define SP              0x0e
  29 #define O7              0x0f
  30 #define FP              0x1e
  31
  32 #define r_SKB           O0
  33 #define r_A             O1
  34 #define r_X             O2
  35 #define r_saved_O7      O3
  36 #define r_HEADLEN       O4
  37 #define r_SKB_DATA      O5
  38 #define r_TMP           G1
  39 #define r_TMP2          G2
  40 #define r_OFF           G3
  41
  42 /* assembly code in arch/sparc/net/bpf_jit_asm.S */
  43 extern u32 bpf_jit_load_word[];
  44 extern u32 bpf_jit_load_half[];
  45 extern u32 bpf_jit_load_byte[];
  46 extern u32 bpf_jit_load_byte_msh[];
  47 extern u32 bpf_jit_load_word_positive_offset[];
  48 extern u32 bpf_jit_load_half_positive_offset[];
  49 extern u32 bpf_jit_load_byte_positive_offset[];
  50 extern u32 bpf_jit_load_byte_msh_positive_offset[];
  51 extern u32 bpf_jit_load_word_negative_offset[];
  52 extern u32 bpf_jit_load_half_negative_offset[];
  53 extern u32 bpf_jit_load_byte_negative_offset[];
  54 extern u32 bpf_jit_load_byte_msh_negative_offset[];
  55
  56 #else
  57 #define r_SKB           %o0
  58 #define r_A             %o1
  59 #define r_X             %o2
  60 #define r_saved_O7      %o3
  61 #define r_HEADLEN       %o4
  62 #define r_SKB_DATA      %o5
  63 #define r_TMP           %g1
  64 #define r_TMP2          %g2
  65 #define r_OFF           %g3
  66 #endif
  67
  68 #endif /* _BPF_JIT_H */