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6ac0ba5a NR |
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 |