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6ac0ba5a NR |
1 | /* |
2 | * bpf_jit.h: BPF JIT compiler for PPC | |
0ca87f05 ME |
3 | * |
4 | * Copyright 2011 Matt Evans <matt@ozlabs.org>, IBM Corporation | |
156d0e29 | 5 | * 2016 Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> |
0ca87f05 ME |
6 | * |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; version 2 | |
10 | * of the License. | |
11 | */ | |
12 | #ifndef _BPF_JIT_H | |
13 | #define _BPF_JIT_H | |
14 | ||
0ca87f05 ME |
15 | #ifndef __ASSEMBLY__ |
16 | ||
156d0e29 NR |
17 | #include <asm/types.h> |
18 | ||
19 | #ifdef PPC64_ELF_ABI_v1 | |
0ca87f05 | 20 | #define FUNCTION_DESCR_SIZE 24 |
09ca5ab2 DK |
21 | #else |
22 | #define FUNCTION_DESCR_SIZE 0 | |
23 | #endif | |
0ca87f05 ME |
24 | |
25 | /* | |
26 | * 16-bit immediate helper macros: HA() is for use with sign-extending instrs | |
27 | * (e.g. LD, ADDI). If the bottom 16 bits is "-ve", add another bit into the | |
28 | * top half to negate the effect (i.e. 0xffff + 1 = 0x(1)0000). | |
29 | */ | |
30 | #define IMM_H(i) ((uintptr_t)(i)>>16) | |
31 | #define IMM_HA(i) (((uintptr_t)(i)>>16) + \ | |
cef1e8cd | 32 | (((uintptr_t)(i) & 0x8000) >> 15)) |
0ca87f05 ME |
33 | #define IMM_L(i) ((uintptr_t)(i) & 0xffff) |
34 | ||
35 | #define PLANT_INSTR(d, idx, instr) \ | |
36 | do { if (d) { (d)[idx] = instr; } idx++; } while (0) | |
37 | #define EMIT(instr) PLANT_INSTR(image, ctx->idx, instr) | |
38 | ||
39 | #define PPC_NOP() EMIT(PPC_INST_NOP) | |
40 | #define PPC_BLR() EMIT(PPC_INST_BLR) | |
41 | #define PPC_BLRL() EMIT(PPC_INST_BLRL) | |
cdaade71 MN |
42 | #define PPC_MTLR(r) EMIT(PPC_INST_MTLR | ___PPC_RT(r)) |
43 | #define PPC_ADDI(d, a, i) EMIT(PPC_INST_ADDI | ___PPC_RT(d) | \ | |
44 | ___PPC_RA(a) | IMM_L(i)) | |
0ca87f05 ME |
45 | #define PPC_MR(d, a) PPC_OR(d, a, a) |
46 | #define PPC_LI(r, i) PPC_ADDI(r, 0, i) | |
47 | #define PPC_ADDIS(d, a, i) EMIT(PPC_INST_ADDIS | \ | |
cef1e8cd | 48 | ___PPC_RT(d) | ___PPC_RA(a) | IMM_L(i)) |
0ca87f05 | 49 | #define PPC_LIS(r, i) PPC_ADDIS(r, 0, i) |
cdaade71 MN |
50 | #define PPC_STD(r, base, i) EMIT(PPC_INST_STD | ___PPC_RS(r) | \ |
51 | ___PPC_RA(base) | ((i) & 0xfffc)) | |
09ca5ab2 DK |
52 | #define PPC_STDU(r, base, i) EMIT(PPC_INST_STDU | ___PPC_RS(r) | \ |
53 | ___PPC_RA(base) | ((i) & 0xfffc)) | |
54 | #define PPC_STW(r, base, i) EMIT(PPC_INST_STW | ___PPC_RS(r) | \ | |
cef1e8cd | 55 | ___PPC_RA(base) | IMM_L(i)) |
09ca5ab2 | 56 | #define PPC_STWU(r, base, i) EMIT(PPC_INST_STWU | ___PPC_RS(r) | \ |
cef1e8cd | 57 | ___PPC_RA(base) | IMM_L(i)) |
156d0e29 NR |
58 | #define PPC_STH(r, base, i) EMIT(PPC_INST_STH | ___PPC_RS(r) | \ |
59 | ___PPC_RA(base) | IMM_L(i)) | |
60 | #define PPC_STB(r, base, i) EMIT(PPC_INST_STB | ___PPC_RS(r) | \ | |
61 | ___PPC_RA(base) | IMM_L(i)) | |
4e235761 DK |
62 | |
63 | #define PPC_LBZ(r, base, i) EMIT(PPC_INST_LBZ | ___PPC_RT(r) | \ | |
64 | ___PPC_RA(base) | IMM_L(i)) | |
cdaade71 MN |
65 | #define PPC_LD(r, base, i) EMIT(PPC_INST_LD | ___PPC_RT(r) | \ |
66 | ___PPC_RA(base) | IMM_L(i)) | |
67 | #define PPC_LWZ(r, base, i) EMIT(PPC_INST_LWZ | ___PPC_RT(r) | \ | |
68 | ___PPC_RA(base) | IMM_L(i)) | |
69 | #define PPC_LHZ(r, base, i) EMIT(PPC_INST_LHZ | ___PPC_RT(r) | \ | |
70 | ___PPC_RA(base) | IMM_L(i)) | |
9c662cad PB |
71 | #define PPC_LHBRX(r, base, b) EMIT(PPC_INST_LHBRX | ___PPC_RT(r) | \ |
72 | ___PPC_RA(base) | ___PPC_RB(b)) | |
156d0e29 NR |
73 | #define PPC_LDBRX(r, base, b) EMIT(PPC_INST_LDBRX | ___PPC_RT(r) | \ |
74 | ___PPC_RA(base) | ___PPC_RB(b)) | |
75 | ||
76 | #define PPC_BPF_LDARX(t, a, b, eh) EMIT(PPC_INST_LDARX | ___PPC_RT(t) | \ | |
77 | ___PPC_RA(a) | ___PPC_RB(b) | \ | |
78 | __PPC_EH(eh)) | |
79 | #define PPC_BPF_LWARX(t, a, b, eh) EMIT(PPC_INST_LWARX | ___PPC_RT(t) | \ | |
80 | ___PPC_RA(a) | ___PPC_RB(b) | \ | |
81 | __PPC_EH(eh)) | |
82 | #define PPC_BPF_STWCX(s, a, b) EMIT(PPC_INST_STWCX | ___PPC_RS(s) | \ | |
83 | ___PPC_RA(a) | ___PPC_RB(b)) | |
84 | #define PPC_BPF_STDCX(s, a, b) EMIT(PPC_INST_STDCX | ___PPC_RS(s) | \ | |
85 | ___PPC_RA(a) | ___PPC_RB(b)) | |
09ca5ab2 DK |
86 | |
87 | #ifdef CONFIG_PPC64 | |
88 | #define PPC_BPF_LL(r, base, i) do { PPC_LD(r, base, i); } while(0) | |
89 | #define PPC_BPF_STL(r, base, i) do { PPC_STD(r, base, i); } while(0) | |
90 | #define PPC_BPF_STLU(r, base, i) do { PPC_STDU(r, base, i); } while(0) | |
91 | #else | |
92 | #define PPC_BPF_LL(r, base, i) do { PPC_LWZ(r, base, i); } while(0) | |
93 | #define PPC_BPF_STL(r, base, i) do { PPC_STW(r, base, i); } while(0) | |
94 | #define PPC_BPF_STLU(r, base, i) do { PPC_STWU(r, base, i); } while(0) | |
95 | #endif | |
96 | ||
cdaade71 MN |
97 | #define PPC_CMPWI(a, i) EMIT(PPC_INST_CMPWI | ___PPC_RA(a) | IMM_L(i)) |
98 | #define PPC_CMPDI(a, i) EMIT(PPC_INST_CMPDI | ___PPC_RA(a) | IMM_L(i)) | |
156d0e29 NR |
99 | #define PPC_CMPW(a, b) EMIT(PPC_INST_CMPW | ___PPC_RA(a) | \ |
100 | ___PPC_RB(b)) | |
101 | #define PPC_CMPD(a, b) EMIT(PPC_INST_CMPD | ___PPC_RA(a) | \ | |
102 | ___PPC_RB(b)) | |
cdaade71 | 103 | #define PPC_CMPLWI(a, i) EMIT(PPC_INST_CMPLWI | ___PPC_RA(a) | IMM_L(i)) |
156d0e29 | 104 | #define PPC_CMPLDI(a, i) EMIT(PPC_INST_CMPLDI | ___PPC_RA(a) | IMM_L(i)) |
cef1e8cd NR |
105 | #define PPC_CMPLW(a, b) EMIT(PPC_INST_CMPLW | ___PPC_RA(a) | \ |
106 | ___PPC_RB(b)) | |
156d0e29 NR |
107 | #define PPC_CMPLD(a, b) EMIT(PPC_INST_CMPLD | ___PPC_RA(a) | \ |
108 | ___PPC_RB(b)) | |
0ca87f05 | 109 | |
cdaade71 MN |
110 | #define PPC_SUB(d, a, b) EMIT(PPC_INST_SUB | ___PPC_RT(d) | \ |
111 | ___PPC_RB(a) | ___PPC_RA(b)) | |
112 | #define PPC_ADD(d, a, b) EMIT(PPC_INST_ADD | ___PPC_RT(d) | \ | |
113 | ___PPC_RA(a) | ___PPC_RB(b)) | |
156d0e29 NR |
114 | #define PPC_MULD(d, a, b) EMIT(PPC_INST_MULLD | ___PPC_RT(d) | \ |
115 | ___PPC_RA(a) | ___PPC_RB(b)) | |
cef1e8cd | 116 | #define PPC_MULW(d, a, b) EMIT(PPC_INST_MULLW | ___PPC_RT(d) | \ |
cdaade71 MN |
117 | ___PPC_RA(a) | ___PPC_RB(b)) |
118 | #define PPC_MULHWU(d, a, b) EMIT(PPC_INST_MULHWU | ___PPC_RT(d) | \ | |
119 | ___PPC_RA(a) | ___PPC_RB(b)) | |
120 | #define PPC_MULI(d, a, i) EMIT(PPC_INST_MULLI | ___PPC_RT(d) | \ | |
121 | ___PPC_RA(a) | IMM_L(i)) | |
122 | #define PPC_DIVWU(d, a, b) EMIT(PPC_INST_DIVWU | ___PPC_RT(d) | \ | |
123 | ___PPC_RA(a) | ___PPC_RB(b)) | |
156d0e29 NR |
124 | #define PPC_DIVD(d, a, b) EMIT(PPC_INST_DIVD | ___PPC_RT(d) | \ |
125 | ___PPC_RA(a) | ___PPC_RB(b)) | |
cdaade71 MN |
126 | #define PPC_AND(d, a, b) EMIT(PPC_INST_AND | ___PPC_RA(d) | \ |
127 | ___PPC_RS(a) | ___PPC_RB(b)) | |
128 | #define PPC_ANDI(d, a, i) EMIT(PPC_INST_ANDI | ___PPC_RA(d) | \ | |
129 | ___PPC_RS(a) | IMM_L(i)) | |
130 | #define PPC_AND_DOT(d, a, b) EMIT(PPC_INST_ANDDOT | ___PPC_RA(d) | \ | |
131 | ___PPC_RS(a) | ___PPC_RB(b)) | |
132 | #define PPC_OR(d, a, b) EMIT(PPC_INST_OR | ___PPC_RA(d) | \ | |
133 | ___PPC_RS(a) | ___PPC_RB(b)) | |
156d0e29 | 134 | #define PPC_MR(d, a) PPC_OR(d, a, a) |
cdaade71 MN |
135 | #define PPC_ORI(d, a, i) EMIT(PPC_INST_ORI | ___PPC_RA(d) | \ |
136 | ___PPC_RS(a) | IMM_L(i)) | |
137 | #define PPC_ORIS(d, a, i) EMIT(PPC_INST_ORIS | ___PPC_RA(d) | \ | |
138 | ___PPC_RS(a) | IMM_L(i)) | |
02871903 DB |
139 | #define PPC_XOR(d, a, b) EMIT(PPC_INST_XOR | ___PPC_RA(d) | \ |
140 | ___PPC_RS(a) | ___PPC_RB(b)) | |
141 | #define PPC_XORI(d, a, i) EMIT(PPC_INST_XORI | ___PPC_RA(d) | \ | |
142 | ___PPC_RS(a) | IMM_L(i)) | |
143 | #define PPC_XORIS(d, a, i) EMIT(PPC_INST_XORIS | ___PPC_RA(d) | \ | |
144 | ___PPC_RS(a) | IMM_L(i)) | |
156d0e29 NR |
145 | #define PPC_EXTSW(d, a) EMIT(PPC_INST_EXTSW | ___PPC_RA(d) | \ |
146 | ___PPC_RS(a)) | |
cdaade71 MN |
147 | #define PPC_SLW(d, a, s) EMIT(PPC_INST_SLW | ___PPC_RA(d) | \ |
148 | ___PPC_RS(a) | ___PPC_RB(s)) | |
156d0e29 NR |
149 | #define PPC_SLD(d, a, s) EMIT(PPC_INST_SLD | ___PPC_RA(d) | \ |
150 | ___PPC_RS(a) | ___PPC_RB(s)) | |
cdaade71 MN |
151 | #define PPC_SRW(d, a, s) EMIT(PPC_INST_SRW | ___PPC_RA(d) | \ |
152 | ___PPC_RS(a) | ___PPC_RB(s)) | |
156d0e29 NR |
153 | #define PPC_SRD(d, a, s) EMIT(PPC_INST_SRD | ___PPC_RA(d) | \ |
154 | ___PPC_RS(a) | ___PPC_RB(s)) | |
155 | #define PPC_SRAD(d, a, s) EMIT(PPC_INST_SRAD | ___PPC_RA(d) | \ | |
156 | ___PPC_RS(a) | ___PPC_RB(s)) | |
157 | #define PPC_SRADI(d, a, i) EMIT(PPC_INST_SRADI | ___PPC_RA(d) | \ | |
158 | ___PPC_RS(a) | __PPC_SH(i) | \ | |
159 | (((i) & 0x20) >> 4)) | |
277285b8 NR |
160 | #define PPC_RLWINM(d, a, i, mb, me) EMIT(PPC_INST_RLWINM | ___PPC_RA(d) | \ |
161 | ___PPC_RS(a) | __PPC_SH(i) | \ | |
162 | __PPC_MB(mb) | __PPC_ME(me)) | |
156d0e29 NR |
163 | #define PPC_RLWIMI(d, a, i, mb, me) EMIT(PPC_INST_RLWIMI | ___PPC_RA(d) | \ |
164 | ___PPC_RS(a) | __PPC_SH(i) | \ | |
165 | __PPC_MB(mb) | __PPC_ME(me)) | |
166 | #define PPC_RLDICL(d, a, i, mb) EMIT(PPC_INST_RLDICL | ___PPC_RA(d) | \ | |
167 | ___PPC_RS(a) | __PPC_SH(i) | \ | |
168 | __PPC_MB64(mb) | (((i) & 0x20) >> 4)) | |
277285b8 NR |
169 | #define PPC_RLDICR(d, a, i, me) EMIT(PPC_INST_RLDICR | ___PPC_RA(d) | \ |
170 | ___PPC_RS(a) | __PPC_SH(i) | \ | |
171 | __PPC_ME64(me) | (((i) & 0x20) >> 4)) | |
172 | ||
0ca87f05 | 173 | /* slwi = rlwinm Rx, Ry, n, 0, 31-n */ |
277285b8 | 174 | #define PPC_SLWI(d, a, i) PPC_RLWINM(d, a, i, 0, 31-(i)) |
0ca87f05 | 175 | /* srwi = rlwinm Rx, Ry, 32-n, n, 31 */ |
277285b8 | 176 | #define PPC_SRWI(d, a, i) PPC_RLWINM(d, a, 32-(i), i, 31) |
0ca87f05 | 177 | /* sldi = rldicr Rx, Ry, n, 63-n */ |
277285b8 | 178 | #define PPC_SLDI(d, a, i) PPC_RLDICR(d, a, i, 63-(i)) |
156d0e29 NR |
179 | /* sldi = rldicl Rx, Ry, 64-n, n */ |
180 | #define PPC_SRDI(d, a, i) PPC_RLDICL(d, a, 64-(i), i) | |
277285b8 | 181 | |
cdaade71 | 182 | #define PPC_NEG(d, a) EMIT(PPC_INST_NEG | ___PPC_RT(d) | ___PPC_RA(a)) |
0ca87f05 ME |
183 | |
184 | /* Long jump; (unconditional 'branch') */ | |
185 | #define PPC_JMP(dest) EMIT(PPC_INST_BRANCH | \ | |
186 | (((dest) - (ctx->idx * 4)) & 0x03fffffc)) | |
187 | /* "cond" here covers BO:BI fields. */ | |
188 | #define PPC_BCC_SHORT(cond, dest) EMIT(PPC_INST_BRANCH_COND | \ | |
189 | (((cond) & 0x3ff) << 16) | \ | |
190 | (((dest) - (ctx->idx * 4)) & \ | |
191 | 0xfffc)) | |
aaf2f7e0 NR |
192 | /* Sign-extended 32-bit immediate load */ |
193 | #define PPC_LI32(d, i) do { \ | |
194 | if ((int)(uintptr_t)(i) >= -32768 && \ | |
195 | (int)(uintptr_t)(i) < 32768) \ | |
196 | PPC_LI(d, i); \ | |
197 | else { \ | |
198 | PPC_LIS(d, IMM_H(i)); \ | |
199 | if (IMM_L(i)) \ | |
200 | PPC_ORI(d, d, IMM_L(i)); \ | |
0ca87f05 | 201 | } } while(0) |
aaf2f7e0 | 202 | |
0ca87f05 | 203 | #define PPC_LI64(d, i) do { \ |
b1a05787 NR |
204 | if ((long)(i) >= -2147483648 && \ |
205 | (long)(i) < 2147483648) \ | |
0ca87f05 ME |
206 | PPC_LI32(d, i); \ |
207 | else { \ | |
b1a05787 NR |
208 | if (!((uintptr_t)(i) & 0xffff800000000000ULL)) \ |
209 | PPC_LI(d, ((uintptr_t)(i) >> 32) & 0xffff); \ | |
210 | else { \ | |
211 | PPC_LIS(d, ((uintptr_t)(i) >> 48)); \ | |
212 | if ((uintptr_t)(i) & 0x0000ffff00000000ULL) \ | |
213 | PPC_ORI(d, d, \ | |
214 | ((uintptr_t)(i) >> 32) & 0xffff); \ | |
215 | } \ | |
0ca87f05 ME |
216 | PPC_SLDI(d, d, 32); \ |
217 | if ((uintptr_t)(i) & 0x00000000ffff0000ULL) \ | |
218 | PPC_ORIS(d, d, \ | |
219 | ((uintptr_t)(i) >> 16) & 0xffff); \ | |
220 | if ((uintptr_t)(i) & 0x000000000000ffffULL) \ | |
221 | PPC_ORI(d, d, (uintptr_t)(i) & 0xffff); \ | |
b1a05787 | 222 | } } while (0) |
0ca87f05 | 223 | |
09ca5ab2 DK |
224 | #ifdef CONFIG_PPC64 |
225 | #define PPC_FUNC_ADDR(d,i) do { PPC_LI64(d, i); } while(0) | |
226 | #else | |
227 | #define PPC_FUNC_ADDR(d,i) do { PPC_LI32(d, i); } while(0) | |
228 | #endif | |
229 | ||
0ca87f05 ME |
230 | static inline bool is_nearbranch(int offset) |
231 | { | |
232 | return (offset < 32768) && (offset >= -32768); | |
233 | } | |
234 | ||
235 | /* | |
236 | * The fly in the ointment of code size changing from pass to pass is | |
237 | * avoided by padding the short branch case with a NOP. If code size differs | |
238 | * with different branch reaches we will have the issue of code moving from | |
239 | * one pass to the next and will need a few passes to converge on a stable | |
240 | * state. | |
241 | */ | |
242 | #define PPC_BCC(cond, dest) do { \ | |
243 | if (is_nearbranch((dest) - (ctx->idx * 4))) { \ | |
244 | PPC_BCC_SHORT(cond, dest); \ | |
245 | PPC_NOP(); \ | |
246 | } else { \ | |
247 | /* Flip the 'T or F' bit to invert comparison */ \ | |
248 | PPC_BCC_SHORT(cond ^ COND_CMP_TRUE, (ctx->idx+2)*4); \ | |
249 | PPC_JMP(dest); \ | |
250 | } } while(0) | |
251 | ||
252 | /* To create a branch condition, select a bit of cr0... */ | |
253 | #define CR0_LT 0 | |
254 | #define CR0_GT 1 | |
255 | #define CR0_EQ 2 | |
256 | /* ...and modify BO[3] */ | |
257 | #define COND_CMP_TRUE 0x100 | |
258 | #define COND_CMP_FALSE 0x000 | |
259 | /* Together, they make all required comparisons: */ | |
260 | #define COND_GT (CR0_GT | COND_CMP_TRUE) | |
261 | #define COND_GE (CR0_LT | COND_CMP_FALSE) | |
262 | #define COND_EQ (CR0_EQ | COND_CMP_TRUE) | |
263 | #define COND_NE (CR0_EQ | COND_CMP_FALSE) | |
264 | #define COND_LT (CR0_LT | COND_CMP_TRUE) | |
265 | ||
0ca87f05 ME |
266 | #endif |
267 | ||
268 | #endif |