arch/sparc/net/bpf_jit_comp_32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/moduleloader.h>
   3 #include <linux/workqueue.h>
   4 #include <linux/netdevice.h>
   5 #include <linux/filter.h>
   6 #include <linux/cache.h>
   7 #include <linux/if_vlan.h>
   8
   9 #include <asm/cacheflush.h>
  10 #include <asm/ptrace.h>
  11
  12 #include "bpf_jit_32.h"
  13
  14 static inline bool is_simm13(unsigned int value)
  15 {
  16         return value + 0x1000 < 0x2000;
  17 }
  18
  19 #define SEEN_DATAREF 1 /* might call external helpers */
  20 #define SEEN_XREG    2 /* ebx is used */
  21 #define SEEN_MEM     4 /* use mem[] for temporary storage */
  22
  23 #define S13(X)          ((X) & 0x1fff)
  24 #define IMMED           0x00002000
  25 #define RD(X)           ((X) << 25)
  26 #define RS1(X)          ((X) << 14)
  27 #define RS2(X)          ((X))
  28 #define OP(X)           ((X) << 30)
  29 #define OP2(X)          ((X) << 22)
  30 #define OP3(X)          ((X) << 19)
  31 #define COND(X)         ((X) << 25)
  32 #define F1(X)           OP(X)
  33 #define F2(X, Y)        (OP(X) | OP2(Y))
  34 #define F3(X, Y)        (OP(X) | OP3(Y))
  35
  36 #define CONDN           COND(0x0)
  37 #define CONDE           COND(0x1)
  38 #define CONDLE          COND(0x2)
  39 #define CONDL           COND(0x3)
  40 #define CONDLEU         COND(0x4)
  41 #define CONDCS          COND(0x5)
  42 #define CONDNEG         COND(0x6)
  43 #define CONDVC          COND(0x7)
  44 #define CONDA           COND(0x8)
  45 #define CONDNE          COND(0x9)
  46 #define CONDG           COND(0xa)
  47 #define CONDGE          COND(0xb)
  48 #define CONDGU          COND(0xc)
  49 #define CONDCC          COND(0xd)
  50 #define CONDPOS         COND(0xe)
  51 #define CONDVS          COND(0xf)
  52
  53 #define CONDGEU         CONDCC
  54 #define CONDLU          CONDCS
  55
  56 #define WDISP22(X)      (((X) >> 2) & 0x3fffff)
  57
  58 #define BA              (F2(0, 2) | CONDA)
  59 #define BGU             (F2(0, 2) | CONDGU)
  60 #define BLEU            (F2(0, 2) | CONDLEU)
  61 #define BGEU            (F2(0, 2) | CONDGEU)
  62 #define BLU             (F2(0, 2) | CONDLU)
  63 #define BE              (F2(0, 2) | CONDE)
  64 #define BNE             (F2(0, 2) | CONDNE)
  65
  66 #define BE_PTR          BE
  67
  68 #define SETHI(K, REG)   \
  69         (F2(0, 0x4) | RD(REG) | (((K) >> 10) & 0x3fffff))
  70 #define OR_LO(K, REG)   \
  71         (F3(2, 0x02) | IMMED | RS1(REG) | ((K) & 0x3ff) | RD(REG))
  72
  73 #define ADD             F3(2, 0x00)
  74 #define AND             F3(2, 0x01)
  75 #define ANDCC           F3(2, 0x11)
  76 #define OR              F3(2, 0x02)
  77 #define XOR             F3(2, 0x03)
  78 #define SUB             F3(2, 0x04)
  79 #define SUBCC           F3(2, 0x14)
  80 #define MUL             F3(2, 0x0a)     /* umul */
  81 #define DIV             F3(2, 0x0e)     /* udiv */
  82 #define SLL             F3(2, 0x25)
  83 #define SRL             F3(2, 0x26)
  84 #define JMPL            F3(2, 0x38)
  85 #define CALL            F1(1)
  86 #define BR              F2(0, 0x01)
  87 #define RD_Y            F3(2, 0x28)
  88 #define WR_Y            F3(2, 0x30)
  89
  90 #define LD32            F3(3, 0x00)
  91 #define LD8             F3(3, 0x01)
  92 #define LD16            F3(3, 0x02)
  93 #define LD64            F3(3, 0x0b)
  94 #define ST32            F3(3, 0x04)
  95
  96 #define LDPTR           LD32
  97 #define BASE_STACKFRAME 96
  98
  99 #define LD32I           (LD32 | IMMED)
 100 #define LD8I            (LD8 | IMMED)
 101 #define LD16I           (LD16 | IMMED)
 102 #define LD64I           (LD64 | IMMED)
 103 #define LDPTRI          (LDPTR | IMMED)
 104 #define ST32I           (ST32 | IMMED)
 105
 106 #define emit_nop()              \
 107 do {                            \
 108         *prog++ = SETHI(0, G0); \
 109 } while (0)
 110
 111 #define emit_neg()                                      \
 112 do {    /* sub %g0, r_A, r_A */                         \
 113         *prog++ = SUB | RS1(G0) | RS2(r_A) | RD(r_A);   \
 114 } while (0)
 115
 116 #define emit_reg_move(FROM, TO)                         \
 117 do {    /* or %g0, FROM, TO */                          \
 118         *prog++ = OR | RS1(G0) | RS2(FROM) | RD(TO);    \
 119 } while (0)
 120
 121 #define emit_clear(REG)                                 \
 122 do {    /* or %g0, %g0, REG */                          \
 123         *prog++ = OR | RS1(G0) | RS2(G0) | RD(REG);     \
 124 } while (0)
 125
 126 #define emit_set_const(K, REG)                                  \
 127 do {    /* sethi %hi(K), REG */                                 \
 128         *prog++ = SETHI(K, REG);                                \
 129         /* or REG, %lo(K), REG */                               \
 130         *prog++ = OR_LO(K, REG);                                \
 131 } while (0)
 132
 133         /* Emit
 134          *
 135          *      OP      r_A, r_X, r_A
 136          */
 137 #define emit_alu_X(OPCODE)                                      \
 138 do {                                                            \
 139         seen |= SEEN_XREG;                                      \
 140         *prog++ = OPCODE | RS1(r_A) | RS2(r_X) | RD(r_A);       \
 141 } while (0)
 142
 143         /* Emit either:
 144          *
 145          *      OP      r_A, K, r_A
 146          *
 147          * or
 148          *
 149          *      sethi   %hi(K), r_TMP
 150          *      or      r_TMP, %lo(K), r_TMP
 151          *      OP      r_A, r_TMP, r_A
 152          *
 153          * depending upon whether K fits in a signed 13-bit
 154          * immediate instruction field.  Emit nothing if K
 155          * is zero.
 156          */
 157 #define emit_alu_K(OPCODE, K)                                   \
 158 do {                                                            \
 159         if (K || OPCODE == AND || OPCODE == MUL) {              \
 160                 unsigned int _insn = OPCODE;                    \
 161                 _insn |= RS1(r_A) | RD(r_A);                    \
 162                 if (is_simm13(K)) {                             \
 163                         *prog++ = _insn | IMMED | S13(K);       \
 164                 } else {                                        \
 165                         emit_set_const(K, r_TMP);               \
 166                         *prog++ = _insn | RS2(r_TMP);           \
 167                 }                                               \
 168         }                                                       \
 169 } while (0)
 170
 171 #define emit_loadimm(K, DEST)                                           \
 172 do {                                                                    \
 173         if (is_simm13(K)) {                                             \
 174                 /* or %g0, K, DEST */                                   \
 175                 *prog++ = OR | IMMED | RS1(G0) | S13(K) | RD(DEST);     \
 176         } else {                                                        \
 177                 emit_set_const(K, DEST);                                \
 178         }                                                               \
 179 } while (0)
 180
 181 #define emit_loadptr(BASE, STRUCT, FIELD, DEST)                         \
 182 do {    unsigned int _off = offsetof(STRUCT, FIELD);                    \
 183         BUILD_BUG_ON(sizeof_field(STRUCT, FIELD) != sizeof(void *));    \
 184         *prog++ = LDPTRI | RS1(BASE) | S13(_off) | RD(DEST);            \
 185 } while (0)
 186
 187 #define emit_load32(BASE, STRUCT, FIELD, DEST)                          \
 188 do {    unsigned int _off = offsetof(STRUCT, FIELD);                    \
 189         BUILD_BUG_ON(sizeof_field(STRUCT, FIELD) != sizeof(u32));       \
 190         *prog++ = LD32I | RS1(BASE) | S13(_off) | RD(DEST);             \
 191 } while (0)
 192
 193 #define emit_load16(BASE, STRUCT, FIELD, DEST)                          \
 194 do {    unsigned int _off = offsetof(STRUCT, FIELD);                    \
 195         BUILD_BUG_ON(sizeof_field(STRUCT, FIELD) != sizeof(u16));       \
 196         *prog++ = LD16I | RS1(BASE) | S13(_off) | RD(DEST);             \
 197 } while (0)
 198
 199 #define __emit_load8(BASE, STRUCT, FIELD, DEST)                         \
 200 do {    unsigned int _off = offsetof(STRUCT, FIELD);                    \
 201         *prog++ = LD8I | RS1(BASE) | S13(_off) | RD(DEST);              \
 202 } while (0)
 203
 204 #define emit_load8(BASE, STRUCT, FIELD, DEST)                           \
 205 do {    BUILD_BUG_ON(sizeof_field(STRUCT, FIELD) != sizeof(u8));        \
 206         __emit_load8(BASE, STRUCT, FIELD, DEST);                        \
 207 } while (0)
 208
 209 #define BIAS (-4)
 210
 211 #define emit_ldmem(OFF, DEST)                                           \
 212 do {    *prog++ = LD32I | RS1(SP) | S13(BIAS - (OFF)) | RD(DEST);       \
 213 } while (0)
 214
 215 #define emit_stmem(OFF, SRC)                                            \
 216 do {    *prog++ = ST32I | RS1(SP) | S13(BIAS - (OFF)) | RD(SRC);        \
 217 } while (0)
 218
 219 #ifdef CONFIG_SMP
 220 #define emit_load_cpu(REG)                                              \
 221         emit_load32(G6, struct thread_info, cpu, REG)
 222 #else
 223 #define emit_load_cpu(REG)      emit_clear(REG)
 224 #endif
 225
 226 #define emit_skb_loadptr(FIELD, DEST) \
 227         emit_loadptr(r_SKB, struct sk_buff, FIELD, DEST)
 228 #define emit_skb_load32(FIELD, DEST) \
 229         emit_load32(r_SKB, struct sk_buff, FIELD, DEST)
 230 #define emit_skb_load16(FIELD, DEST) \
 231         emit_load16(r_SKB, struct sk_buff, FIELD, DEST)
 232 #define __emit_skb_load8(FIELD, DEST) \
 233         __emit_load8(r_SKB, struct sk_buff, FIELD, DEST)
 234 #define emit_skb_load8(FIELD, DEST) \
 235         emit_load8(r_SKB, struct sk_buff, FIELD, DEST)
 236
 237 #define emit_jmpl(BASE, IMM_OFF, LREG) \
 238         *prog++ = (JMPL | IMMED | RS1(BASE) | S13(IMM_OFF) | RD(LREG))
 239
 240 #define emit_call(FUNC)                                 \
 241 do {    void *_here = image + addrs[i] - 8;             \
 242         unsigned int _off = (void *)(FUNC) - _here;     \
 243         *prog++ = CALL | (((_off) >> 2) & 0x3fffffff);  \
 244         emit_nop();                                     \
 245 } while (0)
 246
 247 #define emit_branch(BR_OPC, DEST)                       \
 248 do {    unsigned int _here = addrs[i] - 8;              \
 249         *prog++ = BR_OPC | WDISP22((DEST) - _here);     \
 250 } while (0)
 251
 252 #define emit_branch_off(BR_OPC, OFF)                    \
 253 do {    *prog++ = BR_OPC | WDISP22(OFF);                \
 254 } while (0)
 255
 256 #define emit_jump(DEST)         emit_branch(BA, DEST)
 257
 258 #define emit_read_y(REG)        *prog++ = RD_Y | RD(REG)
 259 #define emit_write_y(REG)       *prog++ = WR_Y | IMMED | RS1(REG) | S13(0)
 260
 261 #define emit_cmp(R1, R2) \
 262         *prog++ = (SUBCC | RS1(R1) | RS2(R2) | RD(G0))
 263
 264 #define emit_cmpi(R1, IMM) \
 265         *prog++ = (SUBCC | IMMED | RS1(R1) | S13(IMM) | RD(G0));
 266
 267 #define emit_btst(R1, R2) \
 268         *prog++ = (ANDCC | RS1(R1) | RS2(R2) | RD(G0))
 269
 270 #define emit_btsti(R1, IMM) \
 271         *prog++ = (ANDCC | IMMED | RS1(R1) | S13(IMM) | RD(G0));
 272
 273 #define emit_sub(R1, R2, R3) \
 274         *prog++ = (SUB | RS1(R1) | RS2(R2) | RD(R3))
 275
 276 #define emit_subi(R1, IMM, R3) \
 277         *prog++ = (SUB | IMMED | RS1(R1) | S13(IMM) | RD(R3))
 278
 279 #define emit_add(R1, R2, R3) \
 280         *prog++ = (ADD | RS1(R1) | RS2(R2) | RD(R3))
 281
 282 #define emit_addi(R1, IMM, R3) \
 283         *prog++ = (ADD | IMMED | RS1(R1) | S13(IMM) | RD(R3))
 284
 285 #define emit_and(R1, R2, R3) \
 286         *prog++ = (AND | RS1(R1) | RS2(R2) | RD(R3))
 287
 288 #define emit_andi(R1, IMM, R3) \
 289         *prog++ = (AND | IMMED | RS1(R1) | S13(IMM) | RD(R3))
 290
 291 #define emit_alloc_stack(SZ) \
 292         *prog++ = (SUB | IMMED | RS1(SP) | S13(SZ) | RD(SP))
 293
 294 #define emit_release_stack(SZ) \
 295         *prog++ = (ADD | IMMED | RS1(SP) | S13(SZ) | RD(SP))
 296
 297 /* A note about branch offset calculations.  The addrs[] array,
 298  * indexed by BPF instruction, records the address after all the
 299  * sparc instructions emitted for that BPF instruction.
 300  *
 301  * The most common case is to emit a branch at the end of such
 302  * a code sequence.  So this would be two instructions, the
 303  * branch and its delay slot.
 304  *
 305  * Therefore by default the branch emitters calculate the branch
 306  * offset field as:
 307  *
 308  *      destination - (addrs[i] - 8)
 309  *
 310  * This "addrs[i] - 8" is the address of the branch itself or
 311  * what "." would be in assembler notation.  The "8" part is
 312  * how we take into consideration the branch and its delay
 313  * slot mentioned above.
 314  *
 315  * Sometimes we need to emit a branch earlier in the code
 316  * sequence.  And in these situations we adjust "destination"
 317  * to accommodate this difference.  For example, if we needed
 318  * to emit a branch (and its delay slot) right before the
 319  * final instruction emitted for a BPF opcode, we'd use
 320  * "destination + 4" instead of just plain "destination" above.
 321  *
 322  * This is why you see all of these funny emit_branch() and
 323  * emit_jump() calls with adjusted offsets.
 324  */
 325
 326 void bpf_jit_compile(struct bpf_prog *fp)
 327 {
 328         unsigned int cleanup_addr, proglen, oldproglen = 0;
 329         u32 temp[8], *prog, *func, seen = 0, pass;
 330         const struct sock_filter *filter = fp->insns;
 331         int i, flen = fp->len, pc_ret0 = -1;
 332         unsigned int *addrs;
 333         void *image;
 334
 335         if (!bpf_jit_enable)
 336                 return;
 337
 338         addrs = kmalloc_array(flen, sizeof(*addrs), GFP_KERNEL);
 339         if (addrs == NULL)
 340                 return;
 341
 342         /* Before first pass, make a rough estimation of addrs[]
 343          * each bpf instruction is translated to less than 64 bytes
 344          */
 345         for (proglen = 0, i = 0; i < flen; i++) {
 346                 proglen += 64;
 347                 addrs[i] = proglen;
 348         }
 349         cleanup_addr = proglen; /* epilogue address */
 350         image = NULL;
 351         for (pass = 0; pass < 10; pass++) {
 352                 u8 seen_or_pass0 = (pass == 0) ? (SEEN_XREG | SEEN_DATAREF | SEEN_MEM) : seen;
 353
 354                 /* no prologue/epilogue for trivial filters (RET something) */
 355                 proglen = 0;
 356                 prog = temp;
 357
 358                 /* Prologue */
 359                 if (seen_or_pass0) {
 360                         if (seen_or_pass0 & SEEN_MEM) {
 361                                 unsigned int sz = BASE_STACKFRAME;
 362                                 sz += BPF_MEMWORDS * sizeof(u32);
 363                                 emit_alloc_stack(sz);
 364                         }
 365
 366                         /* Make sure we dont leek kernel memory. */
 367                         if (seen_or_pass0 & SEEN_XREG)
 368                                 emit_clear(r_X);
 369
 370                         /* If this filter needs to access skb data,
 371                          * load %o4 and %o5 with:
 372                          *  %o4 = skb->len - skb->data_len
 373                          *  %o5 = skb->data
 374                          * And also back up %o7 into r_saved_O7 so we can
 375                          * invoke the stubs using 'call'.
 376                          */
 377                         if (seen_or_pass0 & SEEN_DATAREF) {
 378                                 emit_load32(r_SKB, struct sk_buff, len, r_HEADLEN);
 379                                 emit_load32(r_SKB, struct sk_buff, data_len, r_TMP);
 380                                 emit_sub(r_HEADLEN, r_TMP, r_HEADLEN);
 381                                 emit_loadptr(r_SKB, struct sk_buff, data, r_SKB_DATA);
 382                         }
 383                 }
 384                 emit_reg_move(O7, r_saved_O7);
 385
 386                 /* Make sure we dont leak kernel information to the user. */
 387                 if (bpf_needs_clear_a(&filter[0]))
 388                         emit_clear(r_A); /* A = 0 */
 389
 390                 for (i = 0; i < flen; i++) {
 391                         unsigned int K = filter[i].k;
 392                         unsigned int t_offset;
 393                         unsigned int f_offset;
 394                         u32 t_op, f_op;
 395                         u16 code = bpf_anc_helper(&filter[i]);
 396                         int ilen;
 397
 398                         switch (code) {
 399                         case BPF_ALU | BPF_ADD | BPF_X: /* A += X; */
 400                                 emit_alu_X(ADD);
 401                                 break;
 402                         case BPF_ALU | BPF_ADD | BPF_K: /* A += K; */
 403                                 emit_alu_K(ADD, K);
 404                                 break;
 405                         case BPF_ALU | BPF_SUB | BPF_X: /* A -= X; */
 406                                 emit_alu_X(SUB);
 407                                 break;
 408                         case BPF_ALU | BPF_SUB | BPF_K: /* A -= K */
 409                                 emit_alu_K(SUB, K);
 410                                 break;
 411                         case BPF_ALU | BPF_AND | BPF_X: /* A &= X */
 412                                 emit_alu_X(AND);
 413                                 break;
 414                         case BPF_ALU | BPF_AND | BPF_K: /* A &= K */
 415                                 emit_alu_K(AND, K);
 416                                 break;
 417                         case BPF_ALU | BPF_OR | BPF_X:  /* A |= X */
 418                                 emit_alu_X(OR);
 419                                 break;
 420                         case BPF_ALU | BPF_OR | BPF_K:  /* A |= K */
 421                                 emit_alu_K(OR, K);
 422                                 break;
 423                         case BPF_ANC | SKF_AD_ALU_XOR_X: /* A ^= X; */
 424                         case BPF_ALU | BPF_XOR | BPF_X:
 425                                 emit_alu_X(XOR);
 426                                 break;
 427                         case BPF_ALU | BPF_XOR | BPF_K: /* A ^= K */
 428                                 emit_alu_K(XOR, K);
 429                                 break;
 430                         case BPF_ALU | BPF_LSH | BPF_X: /* A <<= X */
 431                                 emit_alu_X(SLL);
 432                                 break;
 433                         case BPF_ALU | BPF_LSH | BPF_K: /* A <<= K */
 434                                 emit_alu_K(SLL, K);
 435                                 break;
 436                         case BPF_ALU | BPF_RSH | BPF_X: /* A >>= X */
 437                                 emit_alu_X(SRL);
 438                                 break;
 439                         case BPF_ALU | BPF_RSH | BPF_K: /* A >>= K */
 440                                 emit_alu_K(SRL, K);
 441                                 break;
 442                         case BPF_ALU | BPF_MUL | BPF_X: /* A *= X; */
 443                                 emit_alu_X(MUL);
 444                                 break;
 445                         case BPF_ALU | BPF_MUL | BPF_K: /* A *= K */
 446                                 emit_alu_K(MUL, K);
 447                                 break;
 448                         case BPF_ALU | BPF_DIV | BPF_K: /* A /= K with K != 0*/
 449                                 if (K == 1)
 450                                         break;
 451                                 emit_write_y(G0);
 452                                 /* The Sparc v8 architecture requires
 453                                  * three instructions between a %y
 454                                  * register write and the first use.
 455                                  */
 456                                 emit_nop();
 457                                 emit_nop();
 458                                 emit_nop();
 459                                 emit_alu_K(DIV, K);
 460                                 break;
 461                         case BPF_ALU | BPF_DIV | BPF_X: /* A /= X; */
 462                                 emit_cmpi(r_X, 0);
 463                                 if (pc_ret0 > 0) {
 464                                         t_offset = addrs[pc_ret0 - 1];
 465                                         emit_branch(BE, t_offset + 20);
 466                                         emit_nop(); /* delay slot */
 467                                 } else {
 468                                         emit_branch_off(BNE, 16);
 469                                         emit_nop();
 470                                         emit_jump(cleanup_addr + 20);
 471                                         emit_clear(r_A);
 472                                 }
 473                                 emit_write_y(G0);
 474                                 /* The Sparc v8 architecture requires
 475                                  * three instructions between a %y
 476                                  * register write and the first use.
 477                                  */
 478                                 emit_nop();
 479                                 emit_nop();
 480                                 emit_nop();
 481                                 emit_alu_X(DIV);
 482                                 break;
 483                         case BPF_ALU | BPF_NEG:
 484                                 emit_neg();
 485                                 break;
 486                         case BPF_RET | BPF_K:
 487                                 if (!K) {
 488                                         if (pc_ret0 == -1)
 489                                                 pc_ret0 = i;
 490                                         emit_clear(r_A);
 491                                 } else {
 492                                         emit_loadimm(K, r_A);
 493                                 }
 494                                 fallthrough;
 495                         case BPF_RET | BPF_A:
 496                                 if (seen_or_pass0) {
 497                                         if (i != flen - 1) {
 498                                                 emit_jump(cleanup_addr);
 499                                                 emit_nop();
 500                                                 break;
 501                                         }
 502                                         if (seen_or_pass0 & SEEN_MEM) {
 503                                                 unsigned int sz = BASE_STACKFRAME;
 504                                                 sz += BPF_MEMWORDS * sizeof(u32);
 505                                                 emit_release_stack(sz);
 506                                         }
 507                                 }
 508                                 /* jmpl %r_saved_O7 + 8, %g0 */
 509                                 emit_jmpl(r_saved_O7, 8, G0);
 510                                 emit_reg_move(r_A, O0); /* delay slot */
 511                                 break;
 512                         case BPF_MISC | BPF_TAX:
 513                                 seen |= SEEN_XREG;
 514                                 emit_reg_move(r_A, r_X);
 515                                 break;
 516                         case BPF_MISC | BPF_TXA:
 517                                 seen |= SEEN_XREG;
 518                                 emit_reg_move(r_X, r_A);
 519                                 break;
 520                         case BPF_ANC | SKF_AD_CPU:
 521                                 emit_load_cpu(r_A);
 522                                 break;
 523                         case BPF_ANC | SKF_AD_PROTOCOL:
 524                                 emit_skb_load16(protocol, r_A);
 525                                 break;
 526                         case BPF_ANC | SKF_AD_PKTTYPE:
 527                                 __emit_skb_load8(__pkt_type_offset, r_A);
 528                                 emit_andi(r_A, PKT_TYPE_MAX, r_A);
 529                                 emit_alu_K(SRL, 5);
 530                                 break;
 531                         case BPF_ANC | SKF_AD_IFINDEX:
 532                                 emit_skb_loadptr(dev, r_A);
 533                                 emit_cmpi(r_A, 0);
 534                                 emit_branch(BE_PTR, cleanup_addr + 4);
 535                                 emit_nop();
 536                                 emit_load32(r_A, struct net_device, ifindex, r_A);
 537                                 break;
 538                         case BPF_ANC | SKF_AD_MARK:
 539                                 emit_skb_load32(mark, r_A);
 540                                 break;
 541                         case BPF_ANC | SKF_AD_QUEUE:
 542                                 emit_skb_load16(queue_mapping, r_A);
 543                                 break;
 544                         case BPF_ANC | SKF_AD_HATYPE:
 545                                 emit_skb_loadptr(dev, r_A);
 546                                 emit_cmpi(r_A, 0);
 547                                 emit_branch(BE_PTR, cleanup_addr + 4);
 548                                 emit_nop();
 549                                 emit_load16(r_A, struct net_device, type, r_A);
 550                                 break;
 551                         case BPF_ANC | SKF_AD_RXHASH:
 552                                 emit_skb_load32(hash, r_A);
 553                                 break;
 554                         case BPF_ANC | SKF_AD_VLAN_TAG:
 555                                 emit_skb_load16(vlan_tci, r_A);
 556                                 break;
 557                         case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
 558                                 emit_skb_load32(vlan_all, r_A);
 559                                 emit_cmpi(r_A, 0);
 560                                 emit_branch_off(BE, 12);
 561                                 emit_nop();
 562                                 emit_loadimm(1, r_A);
 563                                 break;
 564                         case BPF_LD | BPF_W | BPF_LEN:
 565                                 emit_skb_load32(len, r_A);
 566                                 break;
 567                         case BPF_LDX | BPF_W | BPF_LEN:
 568                                 emit_skb_load32(len, r_X);
 569                                 break;
 570                         case BPF_LD | BPF_IMM:
 571                                 emit_loadimm(K, r_A);
 572                                 break;
 573                         case BPF_LDX | BPF_IMM:
 574                                 emit_loadimm(K, r_X);
 575                                 break;
 576                         case BPF_LD | BPF_MEM:
 577                                 seen |= SEEN_MEM;
 578                                 emit_ldmem(K * 4, r_A);
 579                                 break;
 580                         case BPF_LDX | BPF_MEM:
 581                                 seen |= SEEN_MEM | SEEN_XREG;
 582                                 emit_ldmem(K * 4, r_X);
 583                                 break;
 584                         case BPF_ST:
 585                                 seen |= SEEN_MEM;
 586                                 emit_stmem(K * 4, r_A);
 587                                 break;
 588                         case BPF_STX:
 589                                 seen |= SEEN_MEM | SEEN_XREG;
 590                                 emit_stmem(K * 4, r_X);
 591                                 break;
 592
 593 #define CHOOSE_LOAD_FUNC(K, func) \
 594         ((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset)
 595
 596                         case BPF_LD | BPF_W | BPF_ABS:
 597                                 func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_word);
 598 common_load:                    seen |= SEEN_DATAREF;
 599                                 emit_loadimm(K, r_OFF);
 600                                 emit_call(func);
 601                                 break;
 602                         case BPF_LD | BPF_H | BPF_ABS:
 603                                 func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_half);
 604                                 goto common_load;
 605                         case BPF_LD | BPF_B | BPF_ABS:
 606                                 func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_byte);
 607                                 goto common_load;
 608                         case BPF_LDX | BPF_B | BPF_MSH:
 609                                 func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_byte_msh);
 610                                 goto common_load;
 611                         case BPF_LD | BPF_W | BPF_IND:
 612                                 func = bpf_jit_load_word;
 613 common_load_ind:                seen |= SEEN_DATAREF | SEEN_XREG;
 614                                 if (K) {
 615                                         if (is_simm13(K)) {
 616                                                 emit_addi(r_X, K, r_OFF);
 617                                         } else {
 618                                                 emit_loadimm(K, r_TMP);
 619                                                 emit_add(r_X, r_TMP, r_OFF);
 620                                         }
 621                                 } else {
 622                                         emit_reg_move(r_X, r_OFF);
 623                                 }
 624                                 emit_call(func);
 625                                 break;
 626                         case BPF_LD | BPF_H | BPF_IND:
 627                                 func = bpf_jit_load_half;
 628                                 goto common_load_ind;
 629                         case BPF_LD | BPF_B | BPF_IND:
 630                                 func = bpf_jit_load_byte;
 631                                 goto common_load_ind;
 632                         case BPF_JMP | BPF_JA:
 633                                 emit_jump(addrs[i + K]);
 634                                 emit_nop();
 635                                 break;
 636
 637 #define COND_SEL(CODE, TOP, FOP)        \
 638         case CODE:                      \
 639                 t_op = TOP;             \
 640                 f_op = FOP;             \
 641                 goto cond_branch
 642
 643                         COND_SEL(BPF_JMP | BPF_JGT | BPF_K, BGU, BLEU);
 644                         COND_SEL(BPF_JMP | BPF_JGE | BPF_K, BGEU, BLU);
 645                         COND_SEL(BPF_JMP | BPF_JEQ | BPF_K, BE, BNE);
 646                         COND_SEL(BPF_JMP | BPF_JSET | BPF_K, BNE, BE);
 647                         COND_SEL(BPF_JMP | BPF_JGT | BPF_X, BGU, BLEU);
 648                         COND_SEL(BPF_JMP | BPF_JGE | BPF_X, BGEU, BLU);
 649                         COND_SEL(BPF_JMP | BPF_JEQ | BPF_X, BE, BNE);
 650                         COND_SEL(BPF_JMP | BPF_JSET | BPF_X, BNE, BE);
 651
 652 cond_branch:                    f_offset = addrs[i + filter[i].jf];
 653                                 t_offset = addrs[i + filter[i].jt];
 654
 655                                 /* same targets, can avoid doing the test :) */
 656                                 if (filter[i].jt == filter[i].jf) {
 657                                         emit_jump(t_offset);
 658                                         emit_nop();
 659                                         break;
 660                                 }
 661
 662                                 switch (code) {
 663                                 case BPF_JMP | BPF_JGT | BPF_X:
 664                                 case BPF_JMP | BPF_JGE | BPF_X:
 665                                 case BPF_JMP | BPF_JEQ | BPF_X:
 666                                         seen |= SEEN_XREG;
 667                                         emit_cmp(r_A, r_X);
 668                                         break;
 669                                 case BPF_JMP | BPF_JSET | BPF_X:
 670                                         seen |= SEEN_XREG;
 671                                         emit_btst(r_A, r_X);
 672                                         break;
 673                                 case BPF_JMP | BPF_JEQ | BPF_K:
 674                                 case BPF_JMP | BPF_JGT | BPF_K:
 675                                 case BPF_JMP | BPF_JGE | BPF_K:
 676                                         if (is_simm13(K)) {
 677                                                 emit_cmpi(r_A, K);
 678                                         } else {
 679                                                 emit_loadimm(K, r_TMP);
 680                                                 emit_cmp(r_A, r_TMP);
 681                                         }
 682                                         break;
 683                                 case BPF_JMP | BPF_JSET | BPF_K:
 684                                         if (is_simm13(K)) {
 685                                                 emit_btsti(r_A, K);
 686                                         } else {
 687                                                 emit_loadimm(K, r_TMP);
 688                                                 emit_btst(r_A, r_TMP);
 689                                         }
 690                                         break;
 691                                 }
 692                                 if (filter[i].jt != 0) {
 693                                         if (filter[i].jf)
 694                                                 t_offset += 8;
 695                                         emit_branch(t_op, t_offset);
 696                                         emit_nop(); /* delay slot */
 697                                         if (filter[i].jf) {
 698                                                 emit_jump(f_offset);
 699                                                 emit_nop();
 700                                         }
 701                                         break;
 702                                 }
 703                                 emit_branch(f_op, f_offset);
 704                                 emit_nop(); /* delay slot */
 705                                 break;
 706
 707                         default:
 708                                 /* hmm, too complex filter, give up with jit compiler */
 709                                 goto out;
 710                         }
 711                         ilen = (void *) prog - (void *) temp;
 712                         if (image) {
 713                                 if (unlikely(proglen + ilen > oldproglen)) {
 714                                         pr_err("bpb_jit_compile fatal error\n");
 715                                         kfree(addrs);
 716                                         module_memfree(image);
 717                                         return;
 718                                 }
 719                                 memcpy(image + proglen, temp, ilen);
 720                         }
 721                         proglen += ilen;
 722                         addrs[i] = proglen;
 723                         prog = temp;
 724                 }
 725                 /* last bpf instruction is always a RET :
 726                  * use it to give the cleanup instruction(s) addr
 727                  */
 728                 cleanup_addr = proglen - 8; /* jmpl; mov r_A,%o0; */
 729                 if (seen_or_pass0 & SEEN_MEM)
 730                         cleanup_addr -= 4; /* add %sp, X, %sp; */
 731
 732                 if (image) {
 733                         if (proglen != oldproglen)
 734                                 pr_err("bpb_jit_compile proglen=%u != oldproglen=%u\n",
 735                                        proglen, oldproglen);
 736                         break;
 737                 }
 738                 if (proglen == oldproglen) {
 739                         image = module_alloc(proglen);
 740                         if (!image)
 741                                 goto out;
 742                 }
 743                 oldproglen = proglen;
 744         }
 745
 746         if (bpf_jit_enable > 1)
 747                 bpf_jit_dump(flen, proglen, pass + 1, image);
 748
 749         if (image) {
 750                 fp->bpf_func = (void *)image;
 751                 fp->jited = 1;
 752         }
 753 out:
 754         kfree(addrs);
 755         return;
 756 }
 757
 758 void bpf_jit_free(struct bpf_prog *fp)
 759 {
 760         if (fp->jited)
 761                 module_memfree(fp->bpf_func);
 762
 763         bpf_prog_unlock_free(fp);
 764 }