Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * BPF JIT compiler for ARM64 |
| 3 | * |
Zi Shen Lim | 251599e | 2015-11-03 22:56:44 -0800 | [diff] [blame] | 4 | * Copyright (C) 2014-2015 Zi Shen Lim <zlim.lnx@gmail.com> |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #define pr_fmt(fmt) "bpf_jit: " fmt |
| 20 | |
| 21 | #include <linux/filter.h> |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 22 | #include <linux/printk.h> |
| 23 | #include <linux/skbuff.h> |
| 24 | #include <linux/slab.h> |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 25 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 26 | #include <asm/byteorder.h> |
| 27 | #include <asm/cacheflush.h> |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 28 | #include <asm/debug-monitors.h> |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 29 | |
| 30 | #include "bpf_jit.h" |
| 31 | |
| 32 | int bpf_jit_enable __read_mostly; |
| 33 | |
| 34 | #define TMP_REG_1 (MAX_BPF_REG + 0) |
| 35 | #define TMP_REG_2 (MAX_BPF_REG + 1) |
| 36 | |
| 37 | /* Map BPF registers to A64 registers */ |
| 38 | static const int bpf2a64[] = { |
| 39 | /* return value from in-kernel function, and exit value from eBPF */ |
| 40 | [BPF_REG_0] = A64_R(7), |
| 41 | /* arguments from eBPF program to in-kernel function */ |
| 42 | [BPF_REG_1] = A64_R(0), |
| 43 | [BPF_REG_2] = A64_R(1), |
| 44 | [BPF_REG_3] = A64_R(2), |
| 45 | [BPF_REG_4] = A64_R(3), |
| 46 | [BPF_REG_5] = A64_R(4), |
| 47 | /* callee saved registers that in-kernel function will preserve */ |
| 48 | [BPF_REG_6] = A64_R(19), |
| 49 | [BPF_REG_7] = A64_R(20), |
| 50 | [BPF_REG_8] = A64_R(21), |
| 51 | [BPF_REG_9] = A64_R(22), |
| 52 | /* read-only frame pointer to access stack */ |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 53 | [BPF_REG_FP] = A64_R(25), |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 54 | /* temporary register for internal BPF JIT */ |
| 55 | [TMP_REG_1] = A64_R(23), |
| 56 | [TMP_REG_2] = A64_R(24), |
| 57 | }; |
| 58 | |
| 59 | struct jit_ctx { |
| 60 | const struct bpf_prog *prog; |
| 61 | int idx; |
| 62 | int tmp_used; |
Zi Shen Lim | 51c9fbb | 2014-12-03 08:38:01 +0000 | [diff] [blame] | 63 | int epilogue_offset; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 64 | int *offset; |
| 65 | u32 *image; |
| 66 | }; |
| 67 | |
| 68 | static inline void emit(const u32 insn, struct jit_ctx *ctx) |
| 69 | { |
| 70 | if (ctx->image != NULL) |
| 71 | ctx->image[ctx->idx] = cpu_to_le32(insn); |
| 72 | |
| 73 | ctx->idx++; |
| 74 | } |
| 75 | |
| 76 | static inline void emit_a64_mov_i64(const int reg, const u64 val, |
| 77 | struct jit_ctx *ctx) |
| 78 | { |
| 79 | u64 tmp = val; |
| 80 | int shift = 0; |
| 81 | |
| 82 | emit(A64_MOVZ(1, reg, tmp & 0xffff, shift), ctx); |
| 83 | tmp >>= 16; |
| 84 | shift += 16; |
| 85 | while (tmp) { |
| 86 | if (tmp & 0xffff) |
| 87 | emit(A64_MOVK(1, reg, tmp & 0xffff, shift), ctx); |
| 88 | tmp >>= 16; |
| 89 | shift += 16; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static inline void emit_a64_mov_i(const int is64, const int reg, |
| 94 | const s32 val, struct jit_ctx *ctx) |
| 95 | { |
| 96 | u16 hi = val >> 16; |
| 97 | u16 lo = val & 0xffff; |
| 98 | |
| 99 | if (hi & 0x8000) { |
| 100 | if (hi == 0xffff) { |
| 101 | emit(A64_MOVN(is64, reg, (u16)~lo, 0), ctx); |
| 102 | } else { |
| 103 | emit(A64_MOVN(is64, reg, (u16)~hi, 16), ctx); |
| 104 | emit(A64_MOVK(is64, reg, lo, 0), ctx); |
| 105 | } |
| 106 | } else { |
| 107 | emit(A64_MOVZ(is64, reg, lo, 0), ctx); |
| 108 | if (hi) |
| 109 | emit(A64_MOVK(is64, reg, hi, 16), ctx); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | static inline int bpf2a64_offset(int bpf_to, int bpf_from, |
| 114 | const struct jit_ctx *ctx) |
| 115 | { |
Xi Wang | 8eee539 | 2015-06-25 05:47:39 -0700 | [diff] [blame] | 116 | int to = ctx->offset[bpf_to]; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 117 | /* -1 to account for the Branch instruction */ |
Xi Wang | 8eee539 | 2015-06-25 05:47:39 -0700 | [diff] [blame] | 118 | int from = ctx->offset[bpf_from] - 1; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 119 | |
| 120 | return to - from; |
| 121 | } |
| 122 | |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 123 | static void jit_fill_hole(void *area, unsigned int size) |
| 124 | { |
| 125 | u32 *ptr; |
| 126 | /* We are guaranteed to have aligned memory. */ |
| 127 | for (ptr = area; size >= sizeof(u32); size -= sizeof(u32)) |
| 128 | *ptr++ = cpu_to_le32(AARCH64_BREAK_FAULT); |
| 129 | } |
| 130 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 131 | static inline int epilogue_offset(const struct jit_ctx *ctx) |
| 132 | { |
Zi Shen Lim | 51c9fbb | 2014-12-03 08:38:01 +0000 | [diff] [blame] | 133 | int to = ctx->epilogue_offset; |
| 134 | int from = ctx->idx; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 135 | |
| 136 | return to - from; |
| 137 | } |
| 138 | |
| 139 | /* Stack must be multiples of 16B */ |
| 140 | #define STACK_ALIGN(sz) (((sz) + 15) & ~15) |
| 141 | |
| 142 | static void build_prologue(struct jit_ctx *ctx) |
| 143 | { |
| 144 | const u8 r6 = bpf2a64[BPF_REG_6]; |
| 145 | const u8 r7 = bpf2a64[BPF_REG_7]; |
| 146 | const u8 r8 = bpf2a64[BPF_REG_8]; |
| 147 | const u8 r9 = bpf2a64[BPF_REG_9]; |
| 148 | const u8 fp = bpf2a64[BPF_REG_FP]; |
| 149 | const u8 ra = bpf2a64[BPF_REG_A]; |
| 150 | const u8 rx = bpf2a64[BPF_REG_X]; |
| 151 | const u8 tmp1 = bpf2a64[TMP_REG_1]; |
| 152 | const u8 tmp2 = bpf2a64[TMP_REG_2]; |
| 153 | int stack_size = MAX_BPF_STACK; |
| 154 | |
| 155 | stack_size += 4; /* extra for skb_copy_bits buffer */ |
| 156 | stack_size = STACK_ALIGN(stack_size); |
| 157 | |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 158 | /* |
| 159 | * BPF prog stack layout |
| 160 | * |
| 161 | * high |
| 162 | * original A64_SP => 0:+-----+ BPF prologue |
| 163 | * |FP/LR| |
| 164 | * current A64_FP => -16:+-----+ |
| 165 | * | ... | callee saved registers |
| 166 | * +-----+ |
| 167 | * | | x25/x26 |
| 168 | * BPF fp register => -80:+-----+ |
| 169 | * | | |
| 170 | * | ... | BPF prog stack |
| 171 | * | | |
| 172 | * | | |
| 173 | * current A64_SP => +-----+ |
| 174 | * | | |
| 175 | * | ... | Function call stack |
| 176 | * | | |
| 177 | * +-----+ |
| 178 | * low |
| 179 | * |
| 180 | */ |
| 181 | |
| 182 | /* Save FP and LR registers to stay align with ARM64 AAPCS */ |
| 183 | emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx); |
| 184 | emit(A64_MOV(1, A64_FP, A64_SP), ctx); |
| 185 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 186 | /* Save callee-saved register */ |
| 187 | emit(A64_PUSH(r6, r7, A64_SP), ctx); |
| 188 | emit(A64_PUSH(r8, r9, A64_SP), ctx); |
| 189 | if (ctx->tmp_used) |
| 190 | emit(A64_PUSH(tmp1, tmp2, A64_SP), ctx); |
| 191 | |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 192 | /* Save fp (x25) and x26. SP requires 16 bytes alignment */ |
| 193 | emit(A64_PUSH(fp, A64_R(26), A64_SP), ctx); |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 194 | |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 195 | /* Set up BPF prog stack base register (x25) */ |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 196 | emit(A64_MOV(1, fp, A64_SP), ctx); |
| 197 | |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 198 | /* Set up function call stack */ |
Yang Shi | 0fcd593 | 2015-11-12 13:57:00 -0800 | [diff] [blame] | 199 | emit(A64_SUB_I(1, A64_SP, A64_SP, stack_size), ctx); |
| 200 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 201 | /* Clear registers A and X */ |
| 202 | emit_a64_mov_i64(ra, 0, ctx); |
| 203 | emit_a64_mov_i64(rx, 0, ctx); |
| 204 | } |
| 205 | |
| 206 | static void build_epilogue(struct jit_ctx *ctx) |
| 207 | { |
| 208 | const u8 r0 = bpf2a64[BPF_REG_0]; |
| 209 | const u8 r6 = bpf2a64[BPF_REG_6]; |
| 210 | const u8 r7 = bpf2a64[BPF_REG_7]; |
| 211 | const u8 r8 = bpf2a64[BPF_REG_8]; |
| 212 | const u8 r9 = bpf2a64[BPF_REG_9]; |
| 213 | const u8 fp = bpf2a64[BPF_REG_FP]; |
| 214 | const u8 tmp1 = bpf2a64[TMP_REG_1]; |
| 215 | const u8 tmp2 = bpf2a64[TMP_REG_2]; |
| 216 | int stack_size = MAX_BPF_STACK; |
| 217 | |
| 218 | stack_size += 4; /* extra for skb_copy_bits buffer */ |
| 219 | stack_size = STACK_ALIGN(stack_size); |
| 220 | |
| 221 | /* We're done with BPF stack */ |
| 222 | emit(A64_ADD_I(1, A64_SP, A64_SP, stack_size), ctx); |
| 223 | |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 224 | /* Restore fs (x25) and x26 */ |
| 225 | emit(A64_POP(fp, A64_R(26), A64_SP), ctx); |
| 226 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 227 | /* Restore callee-saved register */ |
| 228 | if (ctx->tmp_used) |
| 229 | emit(A64_POP(tmp1, tmp2, A64_SP), ctx); |
| 230 | emit(A64_POP(r8, r9, A64_SP), ctx); |
| 231 | emit(A64_POP(r6, r7, A64_SP), ctx); |
| 232 | |
Yang Shi | ec0738d | 2015-11-16 14:35:35 -0800 | [diff] [blame] | 233 | /* Restore FP/LR registers */ |
| 234 | emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx); |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 235 | |
| 236 | /* Set return value */ |
| 237 | emit(A64_MOV(1, A64_R(0), r0), ctx); |
| 238 | |
| 239 | emit(A64_RET(A64_LR), ctx); |
| 240 | } |
| 241 | |
Zi Shen Lim | 30d3d94 | 2014-09-16 21:29:23 +0100 | [diff] [blame] | 242 | /* JITs an eBPF instruction. |
| 243 | * Returns: |
| 244 | * 0 - successfully JITed an 8-byte eBPF instruction. |
| 245 | * >0 - successfully JITed a 16-byte eBPF instruction. |
| 246 | * <0 - failed to JIT. |
| 247 | */ |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 248 | static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) |
| 249 | { |
| 250 | const u8 code = insn->code; |
| 251 | const u8 dst = bpf2a64[insn->dst_reg]; |
| 252 | const u8 src = bpf2a64[insn->src_reg]; |
| 253 | const u8 tmp = bpf2a64[TMP_REG_1]; |
| 254 | const u8 tmp2 = bpf2a64[TMP_REG_2]; |
| 255 | const s16 off = insn->off; |
| 256 | const s32 imm = insn->imm; |
| 257 | const int i = insn - ctx->prog->insnsi; |
| 258 | const bool is64 = BPF_CLASS(code) == BPF_ALU64; |
| 259 | u8 jmp_cond; |
| 260 | s32 jmp_offset; |
| 261 | |
Zi Shen Lim | 251599e | 2015-11-03 22:56:44 -0800 | [diff] [blame] | 262 | #define check_imm(bits, imm) do { \ |
| 263 | if ((((imm) > 0) && ((imm) >> (bits))) || \ |
| 264 | (((imm) < 0) && (~(imm) >> (bits)))) { \ |
| 265 | pr_info("[%2d] imm=%d(0x%x) out of range\n", \ |
| 266 | i, imm, imm); \ |
| 267 | return -EINVAL; \ |
| 268 | } \ |
| 269 | } while (0) |
| 270 | #define check_imm19(imm) check_imm(19, imm) |
| 271 | #define check_imm26(imm) check_imm(26, imm) |
| 272 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 273 | switch (code) { |
| 274 | /* dst = src */ |
| 275 | case BPF_ALU | BPF_MOV | BPF_X: |
| 276 | case BPF_ALU64 | BPF_MOV | BPF_X: |
| 277 | emit(A64_MOV(is64, dst, src), ctx); |
| 278 | break; |
| 279 | /* dst = dst OP src */ |
| 280 | case BPF_ALU | BPF_ADD | BPF_X: |
| 281 | case BPF_ALU64 | BPF_ADD | BPF_X: |
| 282 | emit(A64_ADD(is64, dst, dst, src), ctx); |
| 283 | break; |
| 284 | case BPF_ALU | BPF_SUB | BPF_X: |
| 285 | case BPF_ALU64 | BPF_SUB | BPF_X: |
| 286 | emit(A64_SUB(is64, dst, dst, src), ctx); |
| 287 | break; |
| 288 | case BPF_ALU | BPF_AND | BPF_X: |
| 289 | case BPF_ALU64 | BPF_AND | BPF_X: |
| 290 | emit(A64_AND(is64, dst, dst, src), ctx); |
| 291 | break; |
| 292 | case BPF_ALU | BPF_OR | BPF_X: |
| 293 | case BPF_ALU64 | BPF_OR | BPF_X: |
| 294 | emit(A64_ORR(is64, dst, dst, src), ctx); |
| 295 | break; |
| 296 | case BPF_ALU | BPF_XOR | BPF_X: |
| 297 | case BPF_ALU64 | BPF_XOR | BPF_X: |
| 298 | emit(A64_EOR(is64, dst, dst, src), ctx); |
| 299 | break; |
| 300 | case BPF_ALU | BPF_MUL | BPF_X: |
| 301 | case BPF_ALU64 | BPF_MUL | BPF_X: |
| 302 | emit(A64_MUL(is64, dst, dst, src), ctx); |
| 303 | break; |
| 304 | case BPF_ALU | BPF_DIV | BPF_X: |
| 305 | case BPF_ALU64 | BPF_DIV | BPF_X: |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 306 | case BPF_ALU | BPF_MOD | BPF_X: |
| 307 | case BPF_ALU64 | BPF_MOD | BPF_X: |
Zi Shen Lim | 251599e | 2015-11-03 22:56:44 -0800 | [diff] [blame] | 308 | { |
| 309 | const u8 r0 = bpf2a64[BPF_REG_0]; |
| 310 | |
| 311 | /* if (src == 0) return 0 */ |
| 312 | jmp_offset = 3; /* skip ahead to else path */ |
| 313 | check_imm19(jmp_offset); |
| 314 | emit(A64_CBNZ(is64, src, jmp_offset), ctx); |
| 315 | emit(A64_MOVZ(1, r0, 0, 0), ctx); |
| 316 | jmp_offset = epilogue_offset(ctx); |
| 317 | check_imm26(jmp_offset); |
| 318 | emit(A64_B(jmp_offset), ctx); |
| 319 | /* else */ |
Zi Shen Lim | 14e589f | 2015-11-04 20:43:59 -0800 | [diff] [blame] | 320 | switch (BPF_OP(code)) { |
| 321 | case BPF_DIV: |
| 322 | emit(A64_UDIV(is64, dst, dst, src), ctx); |
| 323 | break; |
| 324 | case BPF_MOD: |
| 325 | ctx->tmp_used = 1; |
| 326 | emit(A64_UDIV(is64, tmp, dst, src), ctx); |
| 327 | emit(A64_MUL(is64, tmp, tmp, src), ctx); |
| 328 | emit(A64_SUB(is64, dst, dst, tmp), ctx); |
| 329 | break; |
| 330 | } |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 331 | break; |
Zi Shen Lim | 251599e | 2015-11-03 22:56:44 -0800 | [diff] [blame] | 332 | } |
Zi Shen Lim | d65a634 | 2014-09-16 19:37:35 +0100 | [diff] [blame] | 333 | case BPF_ALU | BPF_LSH | BPF_X: |
| 334 | case BPF_ALU64 | BPF_LSH | BPF_X: |
| 335 | emit(A64_LSLV(is64, dst, dst, src), ctx); |
| 336 | break; |
| 337 | case BPF_ALU | BPF_RSH | BPF_X: |
| 338 | case BPF_ALU64 | BPF_RSH | BPF_X: |
| 339 | emit(A64_LSRV(is64, dst, dst, src), ctx); |
| 340 | break; |
| 341 | case BPF_ALU | BPF_ARSH | BPF_X: |
| 342 | case BPF_ALU64 | BPF_ARSH | BPF_X: |
| 343 | emit(A64_ASRV(is64, dst, dst, src), ctx); |
| 344 | break; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 345 | /* dst = -dst */ |
| 346 | case BPF_ALU | BPF_NEG: |
| 347 | case BPF_ALU64 | BPF_NEG: |
| 348 | emit(A64_NEG(is64, dst, dst), ctx); |
| 349 | break; |
| 350 | /* dst = BSWAP##imm(dst) */ |
| 351 | case BPF_ALU | BPF_END | BPF_FROM_LE: |
| 352 | case BPF_ALU | BPF_END | BPF_FROM_BE: |
| 353 | #ifdef CONFIG_CPU_BIG_ENDIAN |
| 354 | if (BPF_SRC(code) == BPF_FROM_BE) |
Xi Wang | d63903b | 2015-06-25 18:39:15 -0700 | [diff] [blame] | 355 | goto emit_bswap_uxt; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 356 | #else /* !CONFIG_CPU_BIG_ENDIAN */ |
| 357 | if (BPF_SRC(code) == BPF_FROM_LE) |
Xi Wang | d63903b | 2015-06-25 18:39:15 -0700 | [diff] [blame] | 358 | goto emit_bswap_uxt; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 359 | #endif |
| 360 | switch (imm) { |
| 361 | case 16: |
| 362 | emit(A64_REV16(is64, dst, dst), ctx); |
Xi Wang | d63903b | 2015-06-25 18:39:15 -0700 | [diff] [blame] | 363 | /* zero-extend 16 bits into 64 bits */ |
| 364 | emit(A64_UXTH(is64, dst, dst), ctx); |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 365 | break; |
| 366 | case 32: |
| 367 | emit(A64_REV32(is64, dst, dst), ctx); |
Xi Wang | d63903b | 2015-06-25 18:39:15 -0700 | [diff] [blame] | 368 | /* upper 32 bits already cleared */ |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 369 | break; |
| 370 | case 64: |
| 371 | emit(A64_REV64(dst, dst), ctx); |
| 372 | break; |
| 373 | } |
| 374 | break; |
Xi Wang | d63903b | 2015-06-25 18:39:15 -0700 | [diff] [blame] | 375 | emit_bswap_uxt: |
| 376 | switch (imm) { |
| 377 | case 16: |
| 378 | /* zero-extend 16 bits into 64 bits */ |
| 379 | emit(A64_UXTH(is64, dst, dst), ctx); |
| 380 | break; |
| 381 | case 32: |
| 382 | /* zero-extend 32 bits into 64 bits */ |
| 383 | emit(A64_UXTW(is64, dst, dst), ctx); |
| 384 | break; |
| 385 | case 64: |
| 386 | /* nop */ |
| 387 | break; |
| 388 | } |
| 389 | break; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 390 | /* dst = imm */ |
| 391 | case BPF_ALU | BPF_MOV | BPF_K: |
| 392 | case BPF_ALU64 | BPF_MOV | BPF_K: |
| 393 | emit_a64_mov_i(is64, dst, imm, ctx); |
| 394 | break; |
| 395 | /* dst = dst OP imm */ |
| 396 | case BPF_ALU | BPF_ADD | BPF_K: |
| 397 | case BPF_ALU64 | BPF_ADD | BPF_K: |
| 398 | ctx->tmp_used = 1; |
| 399 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 400 | emit(A64_ADD(is64, dst, dst, tmp), ctx); |
| 401 | break; |
| 402 | case BPF_ALU | BPF_SUB | BPF_K: |
| 403 | case BPF_ALU64 | BPF_SUB | BPF_K: |
| 404 | ctx->tmp_used = 1; |
| 405 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 406 | emit(A64_SUB(is64, dst, dst, tmp), ctx); |
| 407 | break; |
| 408 | case BPF_ALU | BPF_AND | BPF_K: |
| 409 | case BPF_ALU64 | BPF_AND | BPF_K: |
| 410 | ctx->tmp_used = 1; |
| 411 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 412 | emit(A64_AND(is64, dst, dst, tmp), ctx); |
| 413 | break; |
| 414 | case BPF_ALU | BPF_OR | BPF_K: |
| 415 | case BPF_ALU64 | BPF_OR | BPF_K: |
| 416 | ctx->tmp_used = 1; |
| 417 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 418 | emit(A64_ORR(is64, dst, dst, tmp), ctx); |
| 419 | break; |
| 420 | case BPF_ALU | BPF_XOR | BPF_K: |
| 421 | case BPF_ALU64 | BPF_XOR | BPF_K: |
| 422 | ctx->tmp_used = 1; |
| 423 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 424 | emit(A64_EOR(is64, dst, dst, tmp), ctx); |
| 425 | break; |
| 426 | case BPF_ALU | BPF_MUL | BPF_K: |
| 427 | case BPF_ALU64 | BPF_MUL | BPF_K: |
| 428 | ctx->tmp_used = 1; |
| 429 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 430 | emit(A64_MUL(is64, dst, dst, tmp), ctx); |
| 431 | break; |
| 432 | case BPF_ALU | BPF_DIV | BPF_K: |
| 433 | case BPF_ALU64 | BPF_DIV | BPF_K: |
| 434 | ctx->tmp_used = 1; |
| 435 | emit_a64_mov_i(is64, tmp, imm, ctx); |
| 436 | emit(A64_UDIV(is64, dst, dst, tmp), ctx); |
| 437 | break; |
| 438 | case BPF_ALU | BPF_MOD | BPF_K: |
| 439 | case BPF_ALU64 | BPF_MOD | BPF_K: |
| 440 | ctx->tmp_used = 1; |
| 441 | emit_a64_mov_i(is64, tmp2, imm, ctx); |
| 442 | emit(A64_UDIV(is64, tmp, dst, tmp2), ctx); |
| 443 | emit(A64_MUL(is64, tmp, tmp, tmp2), ctx); |
| 444 | emit(A64_SUB(is64, dst, dst, tmp), ctx); |
| 445 | break; |
| 446 | case BPF_ALU | BPF_LSH | BPF_K: |
| 447 | case BPF_ALU64 | BPF_LSH | BPF_K: |
| 448 | emit(A64_LSL(is64, dst, dst, imm), ctx); |
| 449 | break; |
| 450 | case BPF_ALU | BPF_RSH | BPF_K: |
| 451 | case BPF_ALU64 | BPF_RSH | BPF_K: |
| 452 | emit(A64_LSR(is64, dst, dst, imm), ctx); |
| 453 | break; |
| 454 | case BPF_ALU | BPF_ARSH | BPF_K: |
| 455 | case BPF_ALU64 | BPF_ARSH | BPF_K: |
| 456 | emit(A64_ASR(is64, dst, dst, imm), ctx); |
| 457 | break; |
| 458 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 459 | /* JUMP off */ |
| 460 | case BPF_JMP | BPF_JA: |
| 461 | jmp_offset = bpf2a64_offset(i + off, i, ctx); |
| 462 | check_imm26(jmp_offset); |
| 463 | emit(A64_B(jmp_offset), ctx); |
| 464 | break; |
| 465 | /* IF (dst COND src) JUMP off */ |
| 466 | case BPF_JMP | BPF_JEQ | BPF_X: |
| 467 | case BPF_JMP | BPF_JGT | BPF_X: |
| 468 | case BPF_JMP | BPF_JGE | BPF_X: |
| 469 | case BPF_JMP | BPF_JNE | BPF_X: |
| 470 | case BPF_JMP | BPF_JSGT | BPF_X: |
| 471 | case BPF_JMP | BPF_JSGE | BPF_X: |
| 472 | emit(A64_CMP(1, dst, src), ctx); |
| 473 | emit_cond_jmp: |
| 474 | jmp_offset = bpf2a64_offset(i + off, i, ctx); |
| 475 | check_imm19(jmp_offset); |
| 476 | switch (BPF_OP(code)) { |
| 477 | case BPF_JEQ: |
| 478 | jmp_cond = A64_COND_EQ; |
| 479 | break; |
| 480 | case BPF_JGT: |
| 481 | jmp_cond = A64_COND_HI; |
| 482 | break; |
| 483 | case BPF_JGE: |
| 484 | jmp_cond = A64_COND_CS; |
| 485 | break; |
| 486 | case BPF_JNE: |
| 487 | jmp_cond = A64_COND_NE; |
| 488 | break; |
| 489 | case BPF_JSGT: |
| 490 | jmp_cond = A64_COND_GT; |
| 491 | break; |
| 492 | case BPF_JSGE: |
| 493 | jmp_cond = A64_COND_GE; |
| 494 | break; |
| 495 | default: |
| 496 | return -EFAULT; |
| 497 | } |
| 498 | emit(A64_B_(jmp_cond, jmp_offset), ctx); |
| 499 | break; |
| 500 | case BPF_JMP | BPF_JSET | BPF_X: |
| 501 | emit(A64_TST(1, dst, src), ctx); |
| 502 | goto emit_cond_jmp; |
| 503 | /* IF (dst COND imm) JUMP off */ |
| 504 | case BPF_JMP | BPF_JEQ | BPF_K: |
| 505 | case BPF_JMP | BPF_JGT | BPF_K: |
| 506 | case BPF_JMP | BPF_JGE | BPF_K: |
| 507 | case BPF_JMP | BPF_JNE | BPF_K: |
| 508 | case BPF_JMP | BPF_JSGT | BPF_K: |
| 509 | case BPF_JMP | BPF_JSGE | BPF_K: |
| 510 | ctx->tmp_used = 1; |
| 511 | emit_a64_mov_i(1, tmp, imm, ctx); |
| 512 | emit(A64_CMP(1, dst, tmp), ctx); |
| 513 | goto emit_cond_jmp; |
| 514 | case BPF_JMP | BPF_JSET | BPF_K: |
| 515 | ctx->tmp_used = 1; |
| 516 | emit_a64_mov_i(1, tmp, imm, ctx); |
| 517 | emit(A64_TST(1, dst, tmp), ctx); |
| 518 | goto emit_cond_jmp; |
| 519 | /* function call */ |
| 520 | case BPF_JMP | BPF_CALL: |
| 521 | { |
| 522 | const u8 r0 = bpf2a64[BPF_REG_0]; |
| 523 | const u64 func = (u64)__bpf_call_base + imm; |
| 524 | |
| 525 | ctx->tmp_used = 1; |
| 526 | emit_a64_mov_i64(tmp, func, ctx); |
| 527 | emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx); |
| 528 | emit(A64_MOV(1, A64_FP, A64_SP), ctx); |
| 529 | emit(A64_BLR(tmp), ctx); |
| 530 | emit(A64_MOV(1, r0, A64_R(0)), ctx); |
| 531 | emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx); |
| 532 | break; |
| 533 | } |
| 534 | /* function return */ |
| 535 | case BPF_JMP | BPF_EXIT: |
Zi Shen Lim | 51c9fbb | 2014-12-03 08:38:01 +0000 | [diff] [blame] | 536 | /* Optimization: when last instruction is EXIT, |
| 537 | simply fallthrough to epilogue. */ |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 538 | if (i == ctx->prog->len - 1) |
| 539 | break; |
| 540 | jmp_offset = epilogue_offset(ctx); |
| 541 | check_imm26(jmp_offset); |
| 542 | emit(A64_B(jmp_offset), ctx); |
| 543 | break; |
| 544 | |
Zi Shen Lim | 30d3d94 | 2014-09-16 21:29:23 +0100 | [diff] [blame] | 545 | /* dst = imm64 */ |
| 546 | case BPF_LD | BPF_IMM | BPF_DW: |
| 547 | { |
| 548 | const struct bpf_insn insn1 = insn[1]; |
| 549 | u64 imm64; |
| 550 | |
| 551 | if (insn1.code != 0 || insn1.src_reg != 0 || |
| 552 | insn1.dst_reg != 0 || insn1.off != 0) { |
| 553 | /* Note: verifier in BPF core must catch invalid |
| 554 | * instructions. |
| 555 | */ |
| 556 | pr_err_once("Invalid BPF_LD_IMM64 instruction\n"); |
| 557 | return -EINVAL; |
| 558 | } |
| 559 | |
Xi Wang | 1e4df6b | 2015-05-08 06:39:51 +0100 | [diff] [blame] | 560 | imm64 = (u64)insn1.imm << 32 | (u32)imm; |
Zi Shen Lim | 30d3d94 | 2014-09-16 21:29:23 +0100 | [diff] [blame] | 561 | emit_a64_mov_i64(dst, imm64, ctx); |
| 562 | |
| 563 | return 1; |
| 564 | } |
| 565 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 566 | /* LDX: dst = *(size *)(src + off) */ |
| 567 | case BPF_LDX | BPF_MEM | BPF_W: |
| 568 | case BPF_LDX | BPF_MEM | BPF_H: |
| 569 | case BPF_LDX | BPF_MEM | BPF_B: |
| 570 | case BPF_LDX | BPF_MEM | BPF_DW: |
| 571 | ctx->tmp_used = 1; |
| 572 | emit_a64_mov_i(1, tmp, off, ctx); |
| 573 | switch (BPF_SIZE(code)) { |
| 574 | case BPF_W: |
| 575 | emit(A64_LDR32(dst, src, tmp), ctx); |
| 576 | break; |
| 577 | case BPF_H: |
| 578 | emit(A64_LDRH(dst, src, tmp), ctx); |
| 579 | break; |
| 580 | case BPF_B: |
| 581 | emit(A64_LDRB(dst, src, tmp), ctx); |
| 582 | break; |
| 583 | case BPF_DW: |
| 584 | emit(A64_LDR64(dst, src, tmp), ctx); |
| 585 | break; |
| 586 | } |
| 587 | break; |
| 588 | |
| 589 | /* ST: *(size *)(dst + off) = imm */ |
| 590 | case BPF_ST | BPF_MEM | BPF_W: |
| 591 | case BPF_ST | BPF_MEM | BPF_H: |
| 592 | case BPF_ST | BPF_MEM | BPF_B: |
| 593 | case BPF_ST | BPF_MEM | BPF_DW: |
| 594 | goto notyet; |
| 595 | |
| 596 | /* STX: *(size *)(dst + off) = src */ |
| 597 | case BPF_STX | BPF_MEM | BPF_W: |
| 598 | case BPF_STX | BPF_MEM | BPF_H: |
| 599 | case BPF_STX | BPF_MEM | BPF_B: |
| 600 | case BPF_STX | BPF_MEM | BPF_DW: |
| 601 | ctx->tmp_used = 1; |
| 602 | emit_a64_mov_i(1, tmp, off, ctx); |
| 603 | switch (BPF_SIZE(code)) { |
| 604 | case BPF_W: |
| 605 | emit(A64_STR32(src, dst, tmp), ctx); |
| 606 | break; |
| 607 | case BPF_H: |
| 608 | emit(A64_STRH(src, dst, tmp), ctx); |
| 609 | break; |
| 610 | case BPF_B: |
| 611 | emit(A64_STRB(src, dst, tmp), ctx); |
| 612 | break; |
| 613 | case BPF_DW: |
| 614 | emit(A64_STR64(src, dst, tmp), ctx); |
| 615 | break; |
| 616 | } |
| 617 | break; |
| 618 | /* STX XADD: lock *(u32 *)(dst + off) += src */ |
| 619 | case BPF_STX | BPF_XADD | BPF_W: |
| 620 | /* STX XADD: lock *(u64 *)(dst + off) += src */ |
| 621 | case BPF_STX | BPF_XADD | BPF_DW: |
| 622 | goto notyet; |
| 623 | |
| 624 | /* R0 = ntohx(*(size *)(((struct sk_buff *)R6)->data + imm)) */ |
| 625 | case BPF_LD | BPF_ABS | BPF_W: |
| 626 | case BPF_LD | BPF_ABS | BPF_H: |
| 627 | case BPF_LD | BPF_ABS | BPF_B: |
| 628 | /* R0 = ntohx(*(size *)(((struct sk_buff *)R6)->data + src + imm)) */ |
| 629 | case BPF_LD | BPF_IND | BPF_W: |
| 630 | case BPF_LD | BPF_IND | BPF_H: |
| 631 | case BPF_LD | BPF_IND | BPF_B: |
| 632 | { |
| 633 | const u8 r0 = bpf2a64[BPF_REG_0]; /* r0 = return value */ |
| 634 | const u8 r6 = bpf2a64[BPF_REG_6]; /* r6 = pointer to sk_buff */ |
| 635 | const u8 fp = bpf2a64[BPF_REG_FP]; |
| 636 | const u8 r1 = bpf2a64[BPF_REG_1]; /* r1: struct sk_buff *skb */ |
| 637 | const u8 r2 = bpf2a64[BPF_REG_2]; /* r2: int k */ |
| 638 | const u8 r3 = bpf2a64[BPF_REG_3]; /* r3: unsigned int size */ |
| 639 | const u8 r4 = bpf2a64[BPF_REG_4]; /* r4: void *buffer */ |
| 640 | const u8 r5 = bpf2a64[BPF_REG_5]; /* r5: void *(*func)(...) */ |
| 641 | int size; |
| 642 | |
| 643 | emit(A64_MOV(1, r1, r6), ctx); |
| 644 | emit_a64_mov_i(0, r2, imm, ctx); |
| 645 | if (BPF_MODE(code) == BPF_IND) |
| 646 | emit(A64_ADD(0, r2, r2, src), ctx); |
| 647 | switch (BPF_SIZE(code)) { |
| 648 | case BPF_W: |
| 649 | size = 4; |
| 650 | break; |
| 651 | case BPF_H: |
| 652 | size = 2; |
| 653 | break; |
| 654 | case BPF_B: |
| 655 | size = 1; |
| 656 | break; |
| 657 | default: |
| 658 | return -EINVAL; |
| 659 | } |
| 660 | emit_a64_mov_i64(r3, size, ctx); |
| 661 | emit(A64_ADD_I(1, r4, fp, MAX_BPF_STACK), ctx); |
| 662 | emit_a64_mov_i64(r5, (unsigned long)bpf_load_pointer, ctx); |
| 663 | emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx); |
| 664 | emit(A64_MOV(1, A64_FP, A64_SP), ctx); |
| 665 | emit(A64_BLR(r5), ctx); |
| 666 | emit(A64_MOV(1, r0, A64_R(0)), ctx); |
| 667 | emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx); |
| 668 | |
| 669 | jmp_offset = epilogue_offset(ctx); |
| 670 | check_imm19(jmp_offset); |
| 671 | emit(A64_CBZ(1, r0, jmp_offset), ctx); |
| 672 | emit(A64_MOV(1, r5, r0), ctx); |
| 673 | switch (BPF_SIZE(code)) { |
| 674 | case BPF_W: |
| 675 | emit(A64_LDR32(r0, r5, A64_ZR), ctx); |
| 676 | #ifndef CONFIG_CPU_BIG_ENDIAN |
| 677 | emit(A64_REV32(0, r0, r0), ctx); |
| 678 | #endif |
| 679 | break; |
| 680 | case BPF_H: |
| 681 | emit(A64_LDRH(r0, r5, A64_ZR), ctx); |
| 682 | #ifndef CONFIG_CPU_BIG_ENDIAN |
| 683 | emit(A64_REV16(0, r0, r0), ctx); |
| 684 | #endif |
| 685 | break; |
| 686 | case BPF_B: |
| 687 | emit(A64_LDRB(r0, r5, A64_ZR), ctx); |
| 688 | break; |
| 689 | } |
| 690 | break; |
| 691 | } |
| 692 | notyet: |
| 693 | pr_info_once("*** NOT YET: opcode %02x ***\n", code); |
| 694 | return -EFAULT; |
| 695 | |
| 696 | default: |
| 697 | pr_err_once("unknown opcode %02x\n", code); |
| 698 | return -EINVAL; |
| 699 | } |
| 700 | |
| 701 | return 0; |
| 702 | } |
| 703 | |
| 704 | static int build_body(struct jit_ctx *ctx) |
| 705 | { |
| 706 | const struct bpf_prog *prog = ctx->prog; |
| 707 | int i; |
| 708 | |
| 709 | for (i = 0; i < prog->len; i++) { |
| 710 | const struct bpf_insn *insn = &prog->insnsi[i]; |
| 711 | int ret; |
| 712 | |
Xi Wang | 8eee539 | 2015-06-25 05:47:39 -0700 | [diff] [blame] | 713 | ret = build_insn(insn, ctx); |
| 714 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 715 | if (ctx->image == NULL) |
| 716 | ctx->offset[i] = ctx->idx; |
| 717 | |
Zi Shen Lim | 30d3d94 | 2014-09-16 21:29:23 +0100 | [diff] [blame] | 718 | if (ret > 0) { |
| 719 | i++; |
| 720 | continue; |
| 721 | } |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 722 | if (ret) |
| 723 | return ret; |
| 724 | } |
| 725 | |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | static inline void bpf_flush_icache(void *start, void *end) |
| 730 | { |
| 731 | flush_icache_range((unsigned long)start, (unsigned long)end); |
| 732 | } |
| 733 | |
| 734 | void bpf_jit_compile(struct bpf_prog *prog) |
| 735 | { |
| 736 | /* Nothing to do here. We support Internal BPF. */ |
| 737 | } |
| 738 | |
| 739 | void bpf_int_jit_compile(struct bpf_prog *prog) |
| 740 | { |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 741 | struct bpf_binary_header *header; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 742 | struct jit_ctx ctx; |
| 743 | int image_size; |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 744 | u8 *image_ptr; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 745 | |
| 746 | if (!bpf_jit_enable) |
| 747 | return; |
| 748 | |
| 749 | if (!prog || !prog->len) |
| 750 | return; |
| 751 | |
| 752 | memset(&ctx, 0, sizeof(ctx)); |
| 753 | ctx.prog = prog; |
| 754 | |
| 755 | ctx.offset = kcalloc(prog->len, sizeof(int), GFP_KERNEL); |
| 756 | if (ctx.offset == NULL) |
| 757 | return; |
| 758 | |
| 759 | /* 1. Initial fake pass to compute ctx->idx. */ |
| 760 | |
Zi Shen Lim | 51c9fbb | 2014-12-03 08:38:01 +0000 | [diff] [blame] | 761 | /* Fake pass to fill in ctx->offset and ctx->tmp_used. */ |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 762 | if (build_body(&ctx)) |
| 763 | goto out; |
| 764 | |
| 765 | build_prologue(&ctx); |
Zi Shen Lim | 51c9fbb | 2014-12-03 08:38:01 +0000 | [diff] [blame] | 766 | |
| 767 | ctx.epilogue_offset = ctx.idx; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 768 | build_epilogue(&ctx); |
| 769 | |
| 770 | /* Now we know the actual image size. */ |
| 771 | image_size = sizeof(u32) * ctx.idx; |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 772 | header = bpf_jit_binary_alloc(image_size, &image_ptr, |
| 773 | sizeof(u32), jit_fill_hole); |
| 774 | if (header == NULL) |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 775 | goto out; |
| 776 | |
| 777 | /* 2. Now, the actual pass. */ |
| 778 | |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 779 | ctx.image = (u32 *)image_ptr; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 780 | ctx.idx = 0; |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 781 | |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 782 | build_prologue(&ctx); |
| 783 | |
Daniel Borkmann | 60ef049 | 2014-09-11 10:36:48 +0100 | [diff] [blame] | 784 | if (build_body(&ctx)) { |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 785 | bpf_jit_binary_free(header); |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 786 | goto out; |
Daniel Borkmann | 60ef049 | 2014-09-11 10:36:48 +0100 | [diff] [blame] | 787 | } |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 788 | |
| 789 | build_epilogue(&ctx); |
| 790 | |
| 791 | /* And we're done. */ |
| 792 | if (bpf_jit_enable > 1) |
| 793 | bpf_jit_dump(prog->len, image_size, 2, ctx.image); |
| 794 | |
Daniel Borkmann | c3d4c68 | 2015-11-14 01:16:18 +0100 | [diff] [blame] | 795 | bpf_flush_icache(header, ctx.image + ctx.idx); |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 796 | |
| 797 | set_memory_ro((unsigned long)header, header->pages); |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 798 | prog->bpf_func = (void *)ctx.image; |
Daniel Borkmann | a91263d | 2015-09-30 01:41:50 +0200 | [diff] [blame] | 799 | prog->jited = 1; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 800 | out: |
| 801 | kfree(ctx.offset); |
| 802 | } |
| 803 | |
| 804 | void bpf_jit_free(struct bpf_prog *prog) |
| 805 | { |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 806 | unsigned long addr = (unsigned long)prog->bpf_func & PAGE_MASK; |
| 807 | struct bpf_binary_header *header = (void *)addr; |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 808 | |
Daniel Borkmann | b569c1c | 2014-09-16 08:48:50 +0100 | [diff] [blame] | 809 | if (!prog->jited) |
| 810 | goto free_filter; |
| 811 | |
| 812 | set_memory_rw(addr, header->pages); |
| 813 | bpf_jit_binary_free(header); |
| 814 | |
| 815 | free_filter: |
| 816 | bpf_prog_unlock_free(prog); |
Zi Shen Lim | e54bcde | 2014-08-26 21:15:30 -0700 | [diff] [blame] | 817 | } |