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Linux/arch/powerpc/net/bpf_jit32.h

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  1 /*
  2  * bpf_jit32.h: BPF JIT compiler for PPC
  3  *
  4  * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation
  5  *
  6  * Split from bpf_jit.h
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License
 10  * as published by the Free Software Foundation; version 2
 11  * of the License.
 12  */
 13 #ifndef _BPF_JIT32_H
 14 #define _BPF_JIT32_H
 15 
 16 #include "bpf_jit.h"
 17 
 18 #ifdef CONFIG_PPC64
 19 #define BPF_PPC_STACK_R3_OFF    48
 20 #define BPF_PPC_STACK_LOCALS    32
 21 #define BPF_PPC_STACK_BASIC     (48+64)
 22 #define BPF_PPC_STACK_SAVE      (18*8)
 23 #define BPF_PPC_STACKFRAME      (BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \
 24                                  BPF_PPC_STACK_SAVE)
 25 #define BPF_PPC_SLOWPATH_FRAME  (48+64)
 26 #else
 27 #define BPF_PPC_STACK_R3_OFF    24
 28 #define BPF_PPC_STACK_LOCALS    16
 29 #define BPF_PPC_STACK_BASIC     (24+32)
 30 #define BPF_PPC_STACK_SAVE      (18*4)
 31 #define BPF_PPC_STACKFRAME      (BPF_PPC_STACK_BASIC+BPF_PPC_STACK_LOCALS+ \
 32                                  BPF_PPC_STACK_SAVE)
 33 #define BPF_PPC_SLOWPATH_FRAME  (24+32)
 34 #endif
 35 
 36 #define REG_SZ         (BITS_PER_LONG/8)
 37 
 38 /*
 39  * Generated code register usage:
 40  *
 41  * As normal PPC C ABI (e.g. r1=sp, r2=TOC), with:
 42  *
 43  * skb          r3      (Entry parameter)
 44  * A register   r4
 45  * X register   r5
 46  * addr param   r6
 47  * r7-r10       scratch
 48  * skb->data    r14
 49  * skb headlen  r15     (skb->len - skb->data_len)
 50  * m[0]         r16
 51  * m[...]       ...
 52  * m[15]        r31
 53  */
 54 #define r_skb           3
 55 #define r_ret           3
 56 #define r_A             4
 57 #define r_X             5
 58 #define r_addr          6
 59 #define r_scratch1      7
 60 #define r_scratch2      8
 61 #define r_D             14
 62 #define r_HL            15
 63 #define r_M             16
 64 
 65 #ifndef __ASSEMBLY__
 66 
 67 /*
 68  * Assembly helpers from arch/powerpc/net/bpf_jit.S:
 69  */
 70 #define DECLARE_LOAD_FUNC(func) \
 71         extern u8 func[], func##_negative_offset[], func##_positive_offset[]
 72 
 73 DECLARE_LOAD_FUNC(sk_load_word);
 74 DECLARE_LOAD_FUNC(sk_load_half);
 75 DECLARE_LOAD_FUNC(sk_load_byte);
 76 DECLARE_LOAD_FUNC(sk_load_byte_msh);
 77 
 78 #define PPC_LBZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LBZ(r, base, i);   \
 79                 else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
 80                         PPC_LBZ(r, r, IMM_L(i)); } } while(0)
 81 
 82 #define PPC_LD_OFFS(r, base, i) do { if ((i) < 32768) PPC_LD(r, base, i);     \
 83                 else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
 84                         PPC_LD(r, r, IMM_L(i)); } } while(0)
 85 
 86 #define PPC_LWZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LWZ(r, base, i);   \
 87                 else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
 88                         PPC_LWZ(r, r, IMM_L(i)); } } while(0)
 89 
 90 #define PPC_LHZ_OFFS(r, base, i) do { if ((i) < 32768) PPC_LHZ(r, base, i);   \
 91                 else {  PPC_ADDIS(r, base, IMM_HA(i));                        \
 92                         PPC_LHZ(r, r, IMM_L(i)); } } while(0)
 93 
 94 #ifdef CONFIG_PPC64
 95 #define PPC_LL_OFFS(r, base, i) do { PPC_LD_OFFS(r, base, i); } while(0)
 96 #else
 97 #define PPC_LL_OFFS(r, base, i) do { PPC_LWZ_OFFS(r, base, i); } while(0)
 98 #endif
 99 
100 #ifdef CONFIG_SMP
101 #ifdef CONFIG_PPC64
102 #define PPC_BPF_LOAD_CPU(r)             \
103         do { BUILD_BUG_ON(FIELD_SIZEOF(struct paca_struct, paca_index) != 2);   \
104                 PPC_LHZ_OFFS(r, 13, offsetof(struct paca_struct, paca_index));  \
105         } while (0)
106 #else
107 #define PPC_BPF_LOAD_CPU(r)     \
108         do { BUILD_BUG_ON(FIELD_SIZEOF(struct thread_info, cpu) != 4);          \
109                 PPC_LHZ_OFFS(r, (1 & ~(THREAD_SIZE - 1)),                       \
110                                 offsetof(struct thread_info, cpu));             \
111         } while(0)
112 #endif
113 #else
114 #define PPC_BPF_LOAD_CPU(r) do { PPC_LI(r, 0); } while(0)
115 #endif
116 
117 #define PPC_LHBRX_OFFS(r, base, i) \
118                 do { PPC_LI32(r, i); PPC_LHBRX(r, r, base); } while(0)
119 #ifdef __LITTLE_ENDIAN__
120 #define PPC_NTOHS_OFFS(r, base, i)      PPC_LHBRX_OFFS(r, base, i)
121 #else
122 #define PPC_NTOHS_OFFS(r, base, i)      PPC_LHZ_OFFS(r, base, i)
123 #endif
124 
125 #define SEEN_DATAREF 0x10000 /* might call external helpers */
126 #define SEEN_XREG    0x20000 /* X reg is used */
127 #define SEEN_MEM     0x40000 /* SEEN_MEM+(1<<n) = use mem[n] for temporary
128                               * storage */
129 #define SEEN_MEM_MSK 0x0ffff
130 
131 struct codegen_context {
132         unsigned int seen;
133         unsigned int idx;
134         int pc_ret0; /* bpf index of first RET #0 instruction (if any) */
135 };
136 
137 #endif
138 
139 #endif
140 

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