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2809a208 DM |
1 | #include <linux/moduleloader.h> |
2 | #include <linux/workqueue.h> | |
3 | #include <linux/netdevice.h> | |
4 | #include <linux/filter.h> | |
5 | #include <linux/cache.h> | |
54e7e2df | 6 | #include <linux/if_vlan.h> |
2809a208 DM |
7 | |
8 | #include <asm/cacheflush.h> | |
9 | #include <asm/ptrace.h> | |
10 | ||
11 | #include "bpf_jit.h" | |
12 | ||
13 | int bpf_jit_enable __read_mostly; | |
14 | ||
2809a208 DM |
15 | static inline bool is_simm13(unsigned int value) |
16 | { | |
17 | return value + 0x1000 < 0x2000; | |
18 | } | |
19 | ||
20 | static void bpf_flush_icache(void *start_, void *end_) | |
21 | { | |
22 | #ifdef CONFIG_SPARC64 | |
23 | /* Cheetah's I-cache is fully coherent. */ | |
24 | if (tlb_type == spitfire) { | |
25 | unsigned long start = (unsigned long) start_; | |
26 | unsigned long end = (unsigned long) end_; | |
27 | ||
28 | start &= ~7UL; | |
29 | end = (end + 7UL) & ~7UL; | |
30 | while (start < end) { | |
31 | flushi(start); | |
32 | start += 32; | |
33 | } | |
34 | } | |
35 | #endif | |
36 | } | |
37 | ||
38 | #define SEEN_DATAREF 1 /* might call external helpers */ | |
39 | #define SEEN_XREG 2 /* ebx is used */ | |
40 | #define SEEN_MEM 4 /* use mem[] for temporary storage */ | |
41 | ||
42 | #define S13(X) ((X) & 0x1fff) | |
43 | #define IMMED 0x00002000 | |
44 | #define RD(X) ((X) << 25) | |
45 | #define RS1(X) ((X) << 14) | |
46 | #define RS2(X) ((X)) | |
47 | #define OP(X) ((X) << 30) | |
48 | #define OP2(X) ((X) << 22) | |
49 | #define OP3(X) ((X) << 19) | |
50 | #define COND(X) ((X) << 25) | |
51 | #define F1(X) OP(X) | |
52 | #define F2(X, Y) (OP(X) | OP2(Y)) | |
53 | #define F3(X, Y) (OP(X) | OP3(Y)) | |
54 | ||
584c5e2a DM |
55 | #define CONDN COND(0x0) |
56 | #define CONDE COND(0x1) | |
57 | #define CONDLE COND(0x2) | |
58 | #define CONDL COND(0x3) | |
59 | #define CONDLEU COND(0x4) | |
60 | #define CONDCS COND(0x5) | |
61 | #define CONDNEG COND(0x6) | |
62 | #define CONDVC COND(0x7) | |
63 | #define CONDA COND(0x8) | |
64 | #define CONDNE COND(0x9) | |
65 | #define CONDG COND(0xa) | |
66 | #define CONDGE COND(0xb) | |
67 | #define CONDGU COND(0xc) | |
68 | #define CONDCC COND(0xd) | |
69 | #define CONDPOS COND(0xe) | |
70 | #define CONDVS COND(0xf) | |
2809a208 DM |
71 | |
72 | #define CONDGEU CONDCC | |
73 | #define CONDLU CONDCS | |
74 | ||
75 | #define WDISP22(X) (((X) >> 2) & 0x3fffff) | |
76 | ||
77 | #define BA (F2(0, 2) | CONDA) | |
78 | #define BGU (F2(0, 2) | CONDGU) | |
79 | #define BLEU (F2(0, 2) | CONDLEU) | |
80 | #define BGEU (F2(0, 2) | CONDGEU) | |
81 | #define BLU (F2(0, 2) | CONDLU) | |
82 | #define BE (F2(0, 2) | CONDE) | |
83 | #define BNE (F2(0, 2) | CONDNE) | |
84 | ||
85 | #ifdef CONFIG_SPARC64 | |
569810d1 | 86 | #define BE_PTR (F2(0, 1) | CONDE | (2 << 20)) |
2809a208 | 87 | #else |
588f5d62 | 88 | #define BE_PTR BE |
2809a208 DM |
89 | #endif |
90 | ||
91 | #define SETHI(K, REG) \ | |
92 | (F2(0, 0x4) | RD(REG) | (((K) >> 10) & 0x3fffff)) | |
93 | #define OR_LO(K, REG) \ | |
94 | (F3(2, 0x02) | IMMED | RS1(REG) | ((K) & 0x3ff) | RD(REG)) | |
95 | ||
96 | #define ADD F3(2, 0x00) | |
97 | #define AND F3(2, 0x01) | |
98 | #define ANDCC F3(2, 0x11) | |
99 | #define OR F3(2, 0x02) | |
d7ce8a5f | 100 | #define XOR F3(2, 0x03) |
2809a208 DM |
101 | #define SUB F3(2, 0x04) |
102 | #define SUBCC F3(2, 0x14) | |
103 | #define MUL F3(2, 0x0a) /* umul */ | |
104 | #define DIV F3(2, 0x0e) /* udiv */ | |
105 | #define SLL F3(2, 0x25) | |
106 | #define SRL F3(2, 0x26) | |
107 | #define JMPL F3(2, 0x38) | |
108 | #define CALL F1(1) | |
109 | #define BR F2(0, 0x01) | |
110 | #define RD_Y F3(2, 0x28) | |
111 | #define WR_Y F3(2, 0x30) | |
112 | ||
113 | #define LD32 F3(3, 0x00) | |
114 | #define LD8 F3(3, 0x01) | |
115 | #define LD16 F3(3, 0x02) | |
116 | #define LD64 F3(3, 0x0b) | |
117 | #define ST32 F3(3, 0x04) | |
118 | ||
119 | #ifdef CONFIG_SPARC64 | |
120 | #define LDPTR LD64 | |
121 | #define BASE_STACKFRAME 176 | |
122 | #else | |
123 | #define LDPTR LD32 | |
124 | #define BASE_STACKFRAME 96 | |
125 | #endif | |
126 | ||
127 | #define LD32I (LD32 | IMMED) | |
128 | #define LD8I (LD8 | IMMED) | |
129 | #define LD16I (LD16 | IMMED) | |
130 | #define LD64I (LD64 | IMMED) | |
131 | #define LDPTRI (LDPTR | IMMED) | |
132 | #define ST32I (ST32 | IMMED) | |
133 | ||
134 | #define emit_nop() \ | |
135 | do { \ | |
136 | *prog++ = SETHI(0, G0); \ | |
137 | } while (0) | |
138 | ||
139 | #define emit_neg() \ | |
140 | do { /* sub %g0, r_A, r_A */ \ | |
141 | *prog++ = SUB | RS1(G0) | RS2(r_A) | RD(r_A); \ | |
142 | } while (0) | |
143 | ||
144 | #define emit_reg_move(FROM, TO) \ | |
145 | do { /* or %g0, FROM, TO */ \ | |
146 | *prog++ = OR | RS1(G0) | RS2(FROM) | RD(TO); \ | |
147 | } while (0) | |
148 | ||
149 | #define emit_clear(REG) \ | |
150 | do { /* or %g0, %g0, REG */ \ | |
151 | *prog++ = OR | RS1(G0) | RS2(G0) | RD(REG); \ | |
152 | } while (0) | |
153 | ||
154 | #define emit_set_const(K, REG) \ | |
155 | do { /* sethi %hi(K), REG */ \ | |
156 | *prog++ = SETHI(K, REG); \ | |
157 | /* or REG, %lo(K), REG */ \ | |
158 | *prog++ = OR_LO(K, REG); \ | |
159 | } while (0) | |
160 | ||
161 | /* Emit | |
162 | * | |
584c5e2a | 163 | * OP r_A, r_X, r_A |
2809a208 DM |
164 | */ |
165 | #define emit_alu_X(OPCODE) \ | |
166 | do { \ | |
167 | seen |= SEEN_XREG; \ | |
168 | *prog++ = OPCODE | RS1(r_A) | RS2(r_X) | RD(r_A); \ | |
169 | } while (0) | |
170 | ||
171 | /* Emit either: | |
172 | * | |
173 | * OP r_A, K, r_A | |
174 | * | |
175 | * or | |
176 | * | |
177 | * sethi %hi(K), r_TMP | |
178 | * or r_TMP, %lo(K), r_TMP | |
179 | * OP r_A, r_TMP, r_A | |
180 | * | |
181 | * depending upon whether K fits in a signed 13-bit | |
182 | * immediate instruction field. Emit nothing if K | |
183 | * is zero. | |
184 | */ | |
185 | #define emit_alu_K(OPCODE, K) \ | |
584c5e2a | 186 | do { \ |
2809a208 DM |
187 | if (K) { \ |
188 | unsigned int _insn = OPCODE; \ | |
189 | _insn |= RS1(r_A) | RD(r_A); \ | |
190 | if (is_simm13(K)) { \ | |
191 | *prog++ = _insn | IMMED | S13(K); \ | |
192 | } else { \ | |
193 | emit_set_const(K, r_TMP); \ | |
194 | *prog++ = _insn | RS2(r_TMP); \ | |
584c5e2a | 195 | } \ |
2809a208 DM |
196 | } \ |
197 | } while (0) | |
198 | ||
199 | #define emit_loadimm(K, DEST) \ | |
200 | do { \ | |
201 | if (is_simm13(K)) { \ | |
202 | /* or %g0, K, DEST */ \ | |
203 | *prog++ = OR | IMMED | RS1(G0) | S13(K) | RD(DEST); \ | |
204 | } else { \ | |
205 | emit_set_const(K, DEST); \ | |
206 | } \ | |
207 | } while (0) | |
208 | ||
209 | #define emit_loadptr(BASE, STRUCT, FIELD, DEST) \ | |
210 | do { unsigned int _off = offsetof(STRUCT, FIELD); \ | |
211 | BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(void *)); \ | |
212 | *prog++ = LDPTRI | RS1(BASE) | S13(_off) | RD(DEST); \ | |
584c5e2a | 213 | } while (0) |
2809a208 DM |
214 | |
215 | #define emit_load32(BASE, STRUCT, FIELD, DEST) \ | |
216 | do { unsigned int _off = offsetof(STRUCT, FIELD); \ | |
217 | BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(u32)); \ | |
218 | *prog++ = LD32I | RS1(BASE) | S13(_off) | RD(DEST); \ | |
584c5e2a | 219 | } while (0) |
2809a208 DM |
220 | |
221 | #define emit_load16(BASE, STRUCT, FIELD, DEST) \ | |
222 | do { unsigned int _off = offsetof(STRUCT, FIELD); \ | |
223 | BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(u16)); \ | |
224 | *prog++ = LD16I | RS1(BASE) | S13(_off) | RD(DEST); \ | |
584c5e2a | 225 | } while (0) |
2809a208 DM |
226 | |
227 | #define __emit_load8(BASE, STRUCT, FIELD, DEST) \ | |
228 | do { unsigned int _off = offsetof(STRUCT, FIELD); \ | |
229 | *prog++ = LD8I | RS1(BASE) | S13(_off) | RD(DEST); \ | |
584c5e2a | 230 | } while (0) |
2809a208 DM |
231 | |
232 | #define emit_load8(BASE, STRUCT, FIELD, DEST) \ | |
233 | do { BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(u8)); \ | |
234 | __emit_load8(BASE, STRUCT, FIELD, DEST); \ | |
584c5e2a | 235 | } while (0) |
2809a208 DM |
236 | |
237 | #define emit_ldmem(OFF, DEST) \ | |
238 | do { *prog++ = LD32I | RS1(FP) | S13(-(OFF)) | RD(DEST); \ | |
584c5e2a | 239 | } while (0) |
2809a208 DM |
240 | |
241 | #define emit_stmem(OFF, SRC) \ | |
242 | do { *prog++ = LD32I | RS1(FP) | S13(-(OFF)) | RD(SRC); \ | |
584c5e2a | 243 | } while (0) |
2809a208 | 244 | |
2809a208 DM |
245 | #ifdef CONFIG_SMP |
246 | #ifdef CONFIG_SPARC64 | |
247 | #define emit_load_cpu(REG) \ | |
248 | emit_load16(G6, struct thread_info, cpu, REG) | |
249 | #else | |
250 | #define emit_load_cpu(REG) \ | |
251 | emit_load32(G6, struct thread_info, cpu, REG) | |
252 | #endif | |
253 | #else | |
254 | #define emit_load_cpu(REG) emit_clear(REG) | |
255 | #endif | |
256 | ||
257 | #define emit_skb_loadptr(FIELD, DEST) \ | |
258 | emit_loadptr(r_SKB, struct sk_buff, FIELD, DEST) | |
259 | #define emit_skb_load32(FIELD, DEST) \ | |
260 | emit_load32(r_SKB, struct sk_buff, FIELD, DEST) | |
261 | #define emit_skb_load16(FIELD, DEST) \ | |
262 | emit_load16(r_SKB, struct sk_buff, FIELD, DEST) | |
263 | #define __emit_skb_load8(FIELD, DEST) \ | |
264 | __emit_load8(r_SKB, struct sk_buff, FIELD, DEST) | |
265 | #define emit_skb_load8(FIELD, DEST) \ | |
266 | emit_load8(r_SKB, struct sk_buff, FIELD, DEST) | |
267 | ||
268 | #define emit_jmpl(BASE, IMM_OFF, LREG) \ | |
269 | *prog++ = (JMPL | IMMED | RS1(BASE) | S13(IMM_OFF) | RD(LREG)) | |
270 | ||
271 | #define emit_call(FUNC) \ | |
272 | do { void *_here = image + addrs[i] - 8; \ | |
273 | unsigned int _off = (void *)(FUNC) - _here; \ | |
274 | *prog++ = CALL | (((_off) >> 2) & 0x3fffffff); \ | |
275 | emit_nop(); \ | |
276 | } while (0) | |
277 | ||
278 | #define emit_branch(BR_OPC, DEST) \ | |
279 | do { unsigned int _here = addrs[i] - 8; \ | |
280 | *prog++ = BR_OPC | WDISP22((DEST) - _here); \ | |
584c5e2a | 281 | } while (0) |
2809a208 DM |
282 | |
283 | #define emit_branch_off(BR_OPC, OFF) \ | |
284 | do { *prog++ = BR_OPC | WDISP22(OFF); \ | |
584c5e2a | 285 | } while (0) |
2809a208 DM |
286 | |
287 | #define emit_jump(DEST) emit_branch(BA, DEST) | |
288 | ||
584c5e2a DM |
289 | #define emit_read_y(REG) *prog++ = RD_Y | RD(REG) |
290 | #define emit_write_y(REG) *prog++ = WR_Y | IMMED | RS1(REG) | S13(0) | |
2809a208 DM |
291 | |
292 | #define emit_cmp(R1, R2) \ | |
293 | *prog++ = (SUBCC | RS1(R1) | RS2(R2) | RD(G0)) | |
294 | ||
295 | #define emit_cmpi(R1, IMM) \ | |
296 | *prog++ = (SUBCC | IMMED | RS1(R1) | S13(IMM) | RD(G0)); | |
297 | ||
298 | #define emit_btst(R1, R2) \ | |
299 | *prog++ = (ANDCC | RS1(R1) | RS2(R2) | RD(G0)) | |
300 | ||
301 | #define emit_btsti(R1, IMM) \ | |
302 | *prog++ = (ANDCC | IMMED | RS1(R1) | S13(IMM) | RD(G0)); | |
303 | ||
304 | #define emit_sub(R1, R2, R3) \ | |
305 | *prog++ = (SUB | RS1(R1) | RS2(R2) | RD(R3)) | |
306 | ||
307 | #define emit_subi(R1, IMM, R3) \ | |
308 | *prog++ = (SUB | IMMED | RS1(R1) | S13(IMM) | RD(R3)) | |
309 | ||
310 | #define emit_add(R1, R2, R3) \ | |
311 | *prog++ = (ADD | RS1(R1) | RS2(R2) | RD(R3)) | |
312 | ||
313 | #define emit_addi(R1, IMM, R3) \ | |
314 | *prog++ = (ADD | IMMED | RS1(R1) | S13(IMM) | RD(R3)) | |
315 | ||
54e7e2df DB |
316 | #define emit_and(R1, R2, R3) \ |
317 | *prog++ = (AND | RS1(R1) | RS2(R2) | RD(R3)) | |
318 | ||
319 | #define emit_andi(R1, IMM, R3) \ | |
320 | *prog++ = (AND | IMMED | RS1(R1) | S13(IMM) | RD(R3)) | |
321 | ||
2809a208 DM |
322 | #define emit_alloc_stack(SZ) \ |
323 | *prog++ = (SUB | IMMED | RS1(SP) | S13(SZ) | RD(SP)) | |
324 | ||
325 | #define emit_release_stack(SZ) \ | |
326 | *prog++ = (ADD | IMMED | RS1(SP) | S13(SZ) | RD(SP)) | |
327 | ||
584c5e2a DM |
328 | /* A note about branch offset calculations. The addrs[] array, |
329 | * indexed by BPF instruction, records the address after all the | |
330 | * sparc instructions emitted for that BPF instruction. | |
331 | * | |
332 | * The most common case is to emit a branch at the end of such | |
333 | * a code sequence. So this would be two instructions, the | |
334 | * branch and it's delay slot. | |
335 | * | |
336 | * Therefore by default the branch emitters calculate the branch | |
337 | * offset field as: | |
338 | * | |
339 | * destination - (addrs[i] - 8) | |
340 | * | |
341 | * This "addrs[i] - 8" is the address of the branch itself or | |
342 | * what "." would be in assembler notation. The "8" part is | |
343 | * how we take into consideration the branch and it's delay | |
344 | * slot mentioned above. | |
345 | * | |
346 | * Sometimes we need to emit a branch earlier in the code | |
347 | * sequence. And in these situations we adjust "destination" | |
348 | * to accomodate this difference. For example, if we needed | |
349 | * to emit a branch (and it's delay slot) right before the | |
350 | * final instruction emitted for a BPF opcode, we'd use | |
351 | * "destination + 4" instead of just plain "destination" above. | |
352 | * | |
353 | * This is why you see all of these funny emit_branch() and | |
354 | * emit_jump() calls with adjusted offsets. | |
355 | */ | |
356 | ||
7ae457c1 | 357 | void bpf_jit_compile(struct bpf_prog *fp) |
2809a208 DM |
358 | { |
359 | unsigned int cleanup_addr, proglen, oldproglen = 0; | |
360 | u32 temp[8], *prog, *func, seen = 0, pass; | |
361 | const struct sock_filter *filter = fp->insns; | |
362 | int i, flen = fp->len, pc_ret0 = -1; | |
363 | unsigned int *addrs; | |
364 | void *image; | |
365 | ||
366 | if (!bpf_jit_enable) | |
367 | return; | |
368 | ||
369 | addrs = kmalloc(flen * sizeof(*addrs), GFP_KERNEL); | |
370 | if (addrs == NULL) | |
371 | return; | |
372 | ||
373 | /* Before first pass, make a rough estimation of addrs[] | |
374 | * each bpf instruction is translated to less than 64 bytes | |
375 | */ | |
376 | for (proglen = 0, i = 0; i < flen; i++) { | |
377 | proglen += 64; | |
378 | addrs[i] = proglen; | |
379 | } | |
380 | cleanup_addr = proglen; /* epilogue address */ | |
381 | image = NULL; | |
382 | for (pass = 0; pass < 10; pass++) { | |
383 | u8 seen_or_pass0 = (pass == 0) ? (SEEN_XREG | SEEN_DATAREF | SEEN_MEM) : seen; | |
384 | ||
385 | /* no prologue/epilogue for trivial filters (RET something) */ | |
386 | proglen = 0; | |
387 | prog = temp; | |
388 | ||
389 | /* Prologue */ | |
390 | if (seen_or_pass0) { | |
391 | if (seen_or_pass0 & SEEN_MEM) { | |
392 | unsigned int sz = BASE_STACKFRAME; | |
393 | sz += BPF_MEMWORDS * sizeof(u32); | |
394 | emit_alloc_stack(sz); | |
395 | } | |
396 | ||
397 | /* Make sure we dont leek kernel memory. */ | |
398 | if (seen_or_pass0 & SEEN_XREG) | |
399 | emit_clear(r_X); | |
400 | ||
401 | /* If this filter needs to access skb data, | |
7b56f76e | 402 | * load %o4 and %o5 with: |
2809a208 DM |
403 | * %o4 = skb->len - skb->data_len |
404 | * %o5 = skb->data | |
405 | * And also back up %o7 into r_saved_O7 so we can | |
406 | * invoke the stubs using 'call'. | |
407 | */ | |
408 | if (seen_or_pass0 & SEEN_DATAREF) { | |
409 | emit_load32(r_SKB, struct sk_buff, len, r_HEADLEN); | |
410 | emit_load32(r_SKB, struct sk_buff, data_len, r_TMP); | |
411 | emit_sub(r_HEADLEN, r_TMP, r_HEADLEN); | |
412 | emit_loadptr(r_SKB, struct sk_buff, data, r_SKB_DATA); | |
413 | } | |
414 | } | |
415 | emit_reg_move(O7, r_saved_O7); | |
416 | ||
417 | switch (filter[0].code) { | |
34805931 DB |
418 | case BPF_RET | BPF_K: |
419 | case BPF_LD | BPF_W | BPF_LEN: | |
420 | case BPF_LD | BPF_W | BPF_ABS: | |
421 | case BPF_LD | BPF_H | BPF_ABS: | |
422 | case BPF_LD | BPF_B | BPF_ABS: | |
2809a208 DM |
423 | /* The first instruction sets the A register (or is |
424 | * a "RET 'constant'") | |
425 | */ | |
426 | break; | |
427 | default: | |
428 | /* Make sure we dont leak kernel information to the | |
429 | * user. | |
430 | */ | |
431 | emit_clear(r_A); /* A = 0 */ | |
432 | } | |
433 | ||
434 | for (i = 0; i < flen; i++) { | |
435 | unsigned int K = filter[i].k; | |
436 | unsigned int t_offset; | |
437 | unsigned int f_offset; | |
438 | u32 t_op, f_op; | |
34805931 | 439 | u16 code = bpf_anc_helper(&filter[i]); |
2809a208 DM |
440 | int ilen; |
441 | ||
34805931 DB |
442 | switch (code) { |
443 | case BPF_ALU | BPF_ADD | BPF_X: /* A += X; */ | |
2809a208 DM |
444 | emit_alu_X(ADD); |
445 | break; | |
34805931 | 446 | case BPF_ALU | BPF_ADD | BPF_K: /* A += K; */ |
2809a208 DM |
447 | emit_alu_K(ADD, K); |
448 | break; | |
34805931 | 449 | case BPF_ALU | BPF_SUB | BPF_X: /* A -= X; */ |
2809a208 DM |
450 | emit_alu_X(SUB); |
451 | break; | |
34805931 | 452 | case BPF_ALU | BPF_SUB | BPF_K: /* A -= K */ |
2809a208 DM |
453 | emit_alu_K(SUB, K); |
454 | break; | |
34805931 | 455 | case BPF_ALU | BPF_AND | BPF_X: /* A &= X */ |
2809a208 DM |
456 | emit_alu_X(AND); |
457 | break; | |
34805931 | 458 | case BPF_ALU | BPF_AND | BPF_K: /* A &= K */ |
2809a208 DM |
459 | emit_alu_K(AND, K); |
460 | break; | |
34805931 | 461 | case BPF_ALU | BPF_OR | BPF_X: /* A |= X */ |
2809a208 DM |
462 | emit_alu_X(OR); |
463 | break; | |
34805931 | 464 | case BPF_ALU | BPF_OR | BPF_K: /* A |= K */ |
2809a208 DM |
465 | emit_alu_K(OR, K); |
466 | break; | |
34805931 DB |
467 | case BPF_ANC | SKF_AD_ALU_XOR_X: /* A ^= X; */ |
468 | case BPF_ALU | BPF_XOR | BPF_X: | |
d7ce8a5f DM |
469 | emit_alu_X(XOR); |
470 | break; | |
34805931 | 471 | case BPF_ALU | BPF_XOR | BPF_K: /* A ^= K */ |
aa99521e DB |
472 | emit_alu_K(XOR, K); |
473 | break; | |
34805931 | 474 | case BPF_ALU | BPF_LSH | BPF_X: /* A <<= X */ |
2809a208 DM |
475 | emit_alu_X(SLL); |
476 | break; | |
34805931 | 477 | case BPF_ALU | BPF_LSH | BPF_K: /* A <<= K */ |
2809a208 DM |
478 | emit_alu_K(SLL, K); |
479 | break; | |
34805931 | 480 | case BPF_ALU | BPF_RSH | BPF_X: /* A >>= X */ |
2809a208 DM |
481 | emit_alu_X(SRL); |
482 | break; | |
34805931 | 483 | case BPF_ALU | BPF_RSH | BPF_K: /* A >>= K */ |
2809a208 DM |
484 | emit_alu_K(SRL, K); |
485 | break; | |
34805931 | 486 | case BPF_ALU | BPF_MUL | BPF_X: /* A *= X; */ |
2809a208 DM |
487 | emit_alu_X(MUL); |
488 | break; | |
34805931 | 489 | case BPF_ALU | BPF_MUL | BPF_K: /* A *= K */ |
2809a208 DM |
490 | emit_alu_K(MUL, K); |
491 | break; | |
34805931 | 492 | case BPF_ALU | BPF_DIV | BPF_K: /* A /= K with K != 0*/ |
aee636c4 ED |
493 | if (K == 1) |
494 | break; | |
495 | emit_write_y(G0); | |
496 | #ifdef CONFIG_SPARC32 | |
497 | /* The Sparc v8 architecture requires | |
498 | * three instructions between a %y | |
499 | * register write and the first use. | |
500 | */ | |
501 | emit_nop(); | |
502 | emit_nop(); | |
503 | emit_nop(); | |
504 | #endif | |
505 | emit_alu_K(DIV, K); | |
2809a208 | 506 | break; |
34805931 | 507 | case BPF_ALU | BPF_DIV | BPF_X: /* A /= X; */ |
2809a208 DM |
508 | emit_cmpi(r_X, 0); |
509 | if (pc_ret0 > 0) { | |
510 | t_offset = addrs[pc_ret0 - 1]; | |
511 | #ifdef CONFIG_SPARC32 | |
512 | emit_branch(BE, t_offset + 20); | |
513 | #else | |
514 | emit_branch(BE, t_offset + 8); | |
515 | #endif | |
516 | emit_nop(); /* delay slot */ | |
517 | } else { | |
518 | emit_branch_off(BNE, 16); | |
519 | emit_nop(); | |
520 | #ifdef CONFIG_SPARC32 | |
521 | emit_jump(cleanup_addr + 20); | |
522 | #else | |
523 | emit_jump(cleanup_addr + 8); | |
524 | #endif | |
525 | emit_clear(r_A); | |
526 | } | |
527 | emit_write_y(G0); | |
528 | #ifdef CONFIG_SPARC32 | |
584c5e2a DM |
529 | /* The Sparc v8 architecture requires |
530 | * three instructions between a %y | |
531 | * register write and the first use. | |
532 | */ | |
2809a208 DM |
533 | emit_nop(); |
534 | emit_nop(); | |
535 | emit_nop(); | |
536 | #endif | |
537 | emit_alu_X(DIV); | |
538 | break; | |
34805931 | 539 | case BPF_ALU | BPF_NEG: |
2809a208 DM |
540 | emit_neg(); |
541 | break; | |
34805931 | 542 | case BPF_RET | BPF_K: |
2809a208 DM |
543 | if (!K) { |
544 | if (pc_ret0 == -1) | |
545 | pc_ret0 = i; | |
546 | emit_clear(r_A); | |
547 | } else { | |
548 | emit_loadimm(K, r_A); | |
549 | } | |
550 | /* Fallthrough */ | |
34805931 | 551 | case BPF_RET | BPF_A: |
2809a208 DM |
552 | if (seen_or_pass0) { |
553 | if (i != flen - 1) { | |
554 | emit_jump(cleanup_addr); | |
555 | emit_nop(); | |
556 | break; | |
557 | } | |
558 | if (seen_or_pass0 & SEEN_MEM) { | |
559 | unsigned int sz = BASE_STACKFRAME; | |
560 | sz += BPF_MEMWORDS * sizeof(u32); | |
561 | emit_release_stack(sz); | |
562 | } | |
563 | } | |
564 | /* jmpl %r_saved_O7 + 8, %g0 */ | |
565 | emit_jmpl(r_saved_O7, 8, G0); | |
566 | emit_reg_move(r_A, O0); /* delay slot */ | |
567 | break; | |
34805931 | 568 | case BPF_MISC | BPF_TAX: |
2809a208 DM |
569 | seen |= SEEN_XREG; |
570 | emit_reg_move(r_A, r_X); | |
571 | break; | |
34805931 | 572 | case BPF_MISC | BPF_TXA: |
2809a208 DM |
573 | seen |= SEEN_XREG; |
574 | emit_reg_move(r_X, r_A); | |
575 | break; | |
34805931 | 576 | case BPF_ANC | SKF_AD_CPU: |
2809a208 DM |
577 | emit_load_cpu(r_A); |
578 | break; | |
34805931 | 579 | case BPF_ANC | SKF_AD_PROTOCOL: |
2809a208 DM |
580 | emit_skb_load16(protocol, r_A); |
581 | break; | |
582 | #if 0 | |
583 | /* GCC won't let us take the address of | |
584 | * a bit field even though we very much | |
585 | * know what we are doing here. | |
586 | */ | |
34805931 | 587 | case BPF_ANC | SKF_AD_PKTTYPE: |
2809a208 DM |
588 | __emit_skb_load8(pkt_type, r_A); |
589 | emit_alu_K(SRL, 5); | |
590 | break; | |
591 | #endif | |
34805931 | 592 | case BPF_ANC | SKF_AD_IFINDEX: |
2809a208 DM |
593 | emit_skb_loadptr(dev, r_A); |
594 | emit_cmpi(r_A, 0); | |
569810d1 | 595 | emit_branch(BE_PTR, cleanup_addr + 4); |
2809a208 DM |
596 | emit_nop(); |
597 | emit_load32(r_A, struct net_device, ifindex, r_A); | |
598 | break; | |
34805931 | 599 | case BPF_ANC | SKF_AD_MARK: |
2809a208 DM |
600 | emit_skb_load32(mark, r_A); |
601 | break; | |
34805931 | 602 | case BPF_ANC | SKF_AD_QUEUE: |
2809a208 DM |
603 | emit_skb_load16(queue_mapping, r_A); |
604 | break; | |
34805931 | 605 | case BPF_ANC | SKF_AD_HATYPE: |
2809a208 DM |
606 | emit_skb_loadptr(dev, r_A); |
607 | emit_cmpi(r_A, 0); | |
569810d1 | 608 | emit_branch(BE_PTR, cleanup_addr + 4); |
2809a208 DM |
609 | emit_nop(); |
610 | emit_load16(r_A, struct net_device, type, r_A); | |
611 | break; | |
34805931 | 612 | case BPF_ANC | SKF_AD_RXHASH: |
61b905da | 613 | emit_skb_load32(hash, r_A); |
2809a208 | 614 | break; |
34805931 DB |
615 | case BPF_ANC | SKF_AD_VLAN_TAG: |
616 | case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT: | |
54e7e2df | 617 | emit_skb_load16(vlan_tci, r_A); |
34805931 | 618 | if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) { |
54e7e2df DB |
619 | emit_andi(r_A, VLAN_VID_MASK, r_A); |
620 | } else { | |
621 | emit_loadimm(VLAN_TAG_PRESENT, r_TMP); | |
622 | emit_and(r_A, r_TMP, r_A); | |
623 | } | |
624 | break; | |
2809a208 | 625 | |
34805931 | 626 | case BPF_LD | BPF_IMM: |
2809a208 DM |
627 | emit_loadimm(K, r_A); |
628 | break; | |
34805931 | 629 | case BPF_LDX | BPF_IMM: |
2809a208 DM |
630 | emit_loadimm(K, r_X); |
631 | break; | |
34805931 | 632 | case BPF_LD | BPF_MEM: |
2809a208 DM |
633 | emit_ldmem(K * 4, r_A); |
634 | break; | |
34805931 | 635 | case BPF_LDX | BPF_MEM: |
2809a208 DM |
636 | emit_ldmem(K * 4, r_X); |
637 | break; | |
34805931 | 638 | case BPF_ST: |
2809a208 DM |
639 | emit_stmem(K * 4, r_A); |
640 | break; | |
34805931 | 641 | case BPF_STX: |
2809a208 DM |
642 | emit_stmem(K * 4, r_X); |
643 | break; | |
644 | ||
645 | #define CHOOSE_LOAD_FUNC(K, func) \ | |
646 | ((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset) | |
647 | ||
34805931 | 648 | case BPF_LD | BPF_W | BPF_ABS: |
2809a208 DM |
649 | func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_word); |
650 | common_load: seen |= SEEN_DATAREF; | |
651 | emit_loadimm(K, r_OFF); | |
652 | emit_call(func); | |
653 | break; | |
34805931 | 654 | case BPF_LD | BPF_H | BPF_ABS: |
2809a208 DM |
655 | func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_half); |
656 | goto common_load; | |
34805931 | 657 | case BPF_LD | BPF_B | BPF_ABS: |
2809a208 DM |
658 | func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_byte); |
659 | goto common_load; | |
34805931 | 660 | case BPF_LDX | BPF_B | BPF_MSH: |
2809a208 DM |
661 | func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_byte_msh); |
662 | goto common_load; | |
34805931 | 663 | case BPF_LD | BPF_W | BPF_IND: |
2809a208 DM |
664 | func = bpf_jit_load_word; |
665 | common_load_ind: seen |= SEEN_DATAREF | SEEN_XREG; | |
666 | if (K) { | |
667 | if (is_simm13(K)) { | |
668 | emit_addi(r_X, K, r_OFF); | |
669 | } else { | |
670 | emit_loadimm(K, r_TMP); | |
671 | emit_add(r_X, r_TMP, r_OFF); | |
672 | } | |
673 | } else { | |
674 | emit_reg_move(r_X, r_OFF); | |
675 | } | |
676 | emit_call(func); | |
677 | break; | |
34805931 | 678 | case BPF_LD | BPF_H | BPF_IND: |
2809a208 DM |
679 | func = bpf_jit_load_half; |
680 | goto common_load_ind; | |
34805931 | 681 | case BPF_LD | BPF_B | BPF_IND: |
2809a208 DM |
682 | func = bpf_jit_load_byte; |
683 | goto common_load_ind; | |
34805931 | 684 | case BPF_JMP | BPF_JA: |
2809a208 DM |
685 | emit_jump(addrs[i + K]); |
686 | emit_nop(); | |
687 | break; | |
688 | ||
689 | #define COND_SEL(CODE, TOP, FOP) \ | |
690 | case CODE: \ | |
691 | t_op = TOP; \ | |
692 | f_op = FOP; \ | |
693 | goto cond_branch | |
694 | ||
34805931 DB |
695 | COND_SEL(BPF_JMP | BPF_JGT | BPF_K, BGU, BLEU); |
696 | COND_SEL(BPF_JMP | BPF_JGE | BPF_K, BGEU, BLU); | |
697 | COND_SEL(BPF_JMP | BPF_JEQ | BPF_K, BE, BNE); | |
698 | COND_SEL(BPF_JMP | BPF_JSET | BPF_K, BNE, BE); | |
699 | COND_SEL(BPF_JMP | BPF_JGT | BPF_X, BGU, BLEU); | |
700 | COND_SEL(BPF_JMP | BPF_JGE | BPF_X, BGEU, BLU); | |
701 | COND_SEL(BPF_JMP | BPF_JEQ | BPF_X, BE, BNE); | |
702 | COND_SEL(BPF_JMP | BPF_JSET | BPF_X, BNE, BE); | |
2809a208 DM |
703 | |
704 | cond_branch: f_offset = addrs[i + filter[i].jf]; | |
705 | t_offset = addrs[i + filter[i].jt]; | |
706 | ||
707 | /* same targets, can avoid doing the test :) */ | |
708 | if (filter[i].jt == filter[i].jf) { | |
709 | emit_jump(t_offset); | |
710 | emit_nop(); | |
711 | break; | |
712 | } | |
713 | ||
34805931 DB |
714 | switch (code) { |
715 | case BPF_JMP | BPF_JGT | BPF_X: | |
716 | case BPF_JMP | BPF_JGE | BPF_X: | |
717 | case BPF_JMP | BPF_JEQ | BPF_X: | |
2809a208 DM |
718 | seen |= SEEN_XREG; |
719 | emit_cmp(r_A, r_X); | |
720 | break; | |
34805931 | 721 | case BPF_JMP | BPF_JSET | BPF_X: |
2809a208 DM |
722 | seen |= SEEN_XREG; |
723 | emit_btst(r_A, r_X); | |
724 | break; | |
34805931 DB |
725 | case BPF_JMP | BPF_JEQ | BPF_K: |
726 | case BPF_JMP | BPF_JGT | BPF_K: | |
727 | case BPF_JMP | BPF_JGE | BPF_K: | |
2809a208 DM |
728 | if (is_simm13(K)) { |
729 | emit_cmpi(r_A, K); | |
730 | } else { | |
731 | emit_loadimm(K, r_TMP); | |
732 | emit_cmp(r_A, r_TMP); | |
733 | } | |
734 | break; | |
34805931 | 735 | case BPF_JMP | BPF_JSET | BPF_K: |
2809a208 DM |
736 | if (is_simm13(K)) { |
737 | emit_btsti(r_A, K); | |
738 | } else { | |
739 | emit_loadimm(K, r_TMP); | |
740 | emit_btst(r_A, r_TMP); | |
741 | } | |
742 | break; | |
743 | } | |
744 | if (filter[i].jt != 0) { | |
745 | if (filter[i].jf) | |
746 | t_offset += 8; | |
747 | emit_branch(t_op, t_offset); | |
748 | emit_nop(); /* delay slot */ | |
749 | if (filter[i].jf) { | |
750 | emit_jump(f_offset); | |
751 | emit_nop(); | |
752 | } | |
753 | break; | |
754 | } | |
755 | emit_branch(f_op, f_offset); | |
756 | emit_nop(); /* delay slot */ | |
757 | break; | |
758 | ||
759 | default: | |
760 | /* hmm, too complex filter, give up with jit compiler */ | |
761 | goto out; | |
762 | } | |
763 | ilen = (void *) prog - (void *) temp; | |
764 | if (image) { | |
765 | if (unlikely(proglen + ilen > oldproglen)) { | |
766 | pr_err("bpb_jit_compile fatal error\n"); | |
767 | kfree(addrs); | |
768 | module_free(NULL, image); | |
769 | return; | |
770 | } | |
771 | memcpy(image + proglen, temp, ilen); | |
772 | } | |
773 | proglen += ilen; | |
774 | addrs[i] = proglen; | |
775 | prog = temp; | |
776 | } | |
777 | /* last bpf instruction is always a RET : | |
778 | * use it to give the cleanup instruction(s) addr | |
779 | */ | |
780 | cleanup_addr = proglen - 8; /* jmpl; mov r_A,%o0; */ | |
781 | if (seen_or_pass0 & SEEN_MEM) | |
782 | cleanup_addr -= 4; /* add %sp, X, %sp; */ | |
783 | ||
784 | if (image) { | |
785 | if (proglen != oldproglen) | |
786 | pr_err("bpb_jit_compile proglen=%u != oldproglen=%u\n", | |
787 | proglen, oldproglen); | |
788 | break; | |
789 | } | |
790 | if (proglen == oldproglen) { | |
5199dfe5 | 791 | image = module_alloc(proglen); |
2809a208 DM |
792 | if (!image) |
793 | goto out; | |
794 | } | |
795 | oldproglen = proglen; | |
796 | } | |
797 | ||
798 | if (bpf_jit_enable > 1) | |
79617801 | 799 | bpf_jit_dump(flen, proglen, pass, image); |
2809a208 DM |
800 | |
801 | if (image) { | |
2809a208 DM |
802 | bpf_flush_icache(image, image + proglen); |
803 | fp->bpf_func = (void *)image; | |
f8bbbfc3 | 804 | fp->jited = 1; |
2809a208 DM |
805 | } |
806 | out: | |
807 | kfree(addrs); | |
808 | return; | |
809 | } | |
810 | ||
7ae457c1 | 811 | void bpf_jit_free(struct bpf_prog *fp) |
2809a208 | 812 | { |
f8bbbfc3 | 813 | if (fp->jited) |
5199dfe5 | 814 | module_free(NULL, fp->bpf_func); |
d45ed4a4 | 815 | kfree(fp); |
2809a208 | 816 | } |