1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * intel_pt_pkt_decoder.c: Intel Processor Trace support
4 * Copyright (c) 2013-2014, Intel Corporation.
5 */
6
7 #include <stdio.h>
8 #include <string.h>
9 #include <endian.h>
10 #include <byteswap.h>
11 #include <linux/compiler.h>
12
13 #include "intel-pt-pkt-decoder.h"
14
15 #define BIT(n) (1 << (n))
16
17 #define BIT63 ((uint64_t)1 << 63)
18
19 #if __BYTE_ORDER == __BIG_ENDIAN
20 #define le16_to_cpu bswap_16
21 #define le32_to_cpu bswap_32
22 #define le64_to_cpu bswap_64
23 #define memcpy_le64(d, s, n) do { \
24 memcpy((d), (s), (n)); \
25 *(d) = le64_to_cpu(*(d)); \
26 } while (0)
27 #else
28 #define le16_to_cpu
29 #define le32_to_cpu
30 #define le64_to_cpu
31 #define memcpy_le64 memcpy
32 #endif
33
34 static const char * const packet_name[] = {
35 [INTEL_PT_BAD] = "Bad Packet!",
36 [INTEL_PT_PAD] = "PAD",
37 [INTEL_PT_TNT] = "TNT",
38 [INTEL_PT_TIP_PGD] = "TIP.PGD",
39 [INTEL_PT_TIP_PGE] = "TIP.PGE",
40 [INTEL_PT_TSC] = "TSC",
41 [INTEL_PT_TMA] = "TMA",
42 [INTEL_PT_MODE_EXEC] = "MODE.Exec",
43 [INTEL_PT_MODE_TSX] = "MODE.TSX",
44 [INTEL_PT_MTC] = "MTC",
45 [INTEL_PT_TIP] = "TIP",
46 [INTEL_PT_FUP] = "FUP",
47 [INTEL_PT_CYC] = "CYC",
48 [INTEL_PT_VMCS] = "VMCS",
49 [INTEL_PT_PSB] = "PSB",
50 [INTEL_PT_PSBEND] = "PSBEND",
51 [INTEL_PT_CBR] = "CBR",
52 [INTEL_PT_TRACESTOP] = "TraceSTOP",
53 [INTEL_PT_PIP] = "PIP",
54 [INTEL_PT_OVF] = "OVF",
55 [INTEL_PT_MNT] = "MNT",
56 [INTEL_PT_PTWRITE] = "PTWRITE",
57 [INTEL_PT_PTWRITE_IP] = "PTWRITE",
58 [INTEL_PT_EXSTOP] = "EXSTOP",
59 [INTEL_PT_EXSTOP_IP] = "EXSTOP",
60 [INTEL_PT_MWAIT] = "MWAIT",
61 [INTEL_PT_PWRE] = "PWRE",
62 [INTEL_PT_PWRX] = "PWRX",
63 [INTEL_PT_BBP] = "BBP",
64 [INTEL_PT_BIP] = "BIP",
65 [INTEL_PT_BEP] = "BEP",
66 [INTEL_PT_BEP_IP] = "BEP",
67 };
68
intel_pt_pkt_name(enum intel_pt_pkt_type type)69 const char *intel_pt_pkt_name(enum intel_pt_pkt_type type)
70 {
71 return packet_name[type];
72 }
73
intel_pt_get_long_tnt(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)74 static int intel_pt_get_long_tnt(const unsigned char *buf, size_t len,
75 struct intel_pt_pkt *packet)
76 {
77 uint64_t payload;
78 int count;
79
80 if (len < 8)
81 return INTEL_PT_NEED_MORE_BYTES;
82
83 payload = le64_to_cpu(*(uint64_t *)buf);
84
85 for (count = 47; count; count--) {
86 if (payload & BIT63)
87 break;
88 payload <<= 1;
89 }
90
91 packet->type = INTEL_PT_TNT;
92 packet->count = count;
93 packet->payload = payload << 1;
94 return 8;
95 }
96
intel_pt_get_pip(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)97 static int intel_pt_get_pip(const unsigned char *buf, size_t len,
98 struct intel_pt_pkt *packet)
99 {
100 uint64_t payload = 0;
101
102 if (len < 8)
103 return INTEL_PT_NEED_MORE_BYTES;
104
105 packet->type = INTEL_PT_PIP;
106 memcpy_le64(&payload, buf + 2, 6);
107 packet->payload = payload;
108
109 return 8;
110 }
111
intel_pt_get_tracestop(struct intel_pt_pkt * packet)112 static int intel_pt_get_tracestop(struct intel_pt_pkt *packet)
113 {
114 packet->type = INTEL_PT_TRACESTOP;
115 return 2;
116 }
117
intel_pt_get_cbr(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)118 static int intel_pt_get_cbr(const unsigned char *buf, size_t len,
119 struct intel_pt_pkt *packet)
120 {
121 if (len < 4)
122 return INTEL_PT_NEED_MORE_BYTES;
123 packet->type = INTEL_PT_CBR;
124 packet->payload = le16_to_cpu(*(uint16_t *)(buf + 2));
125 return 4;
126 }
127
intel_pt_get_vmcs(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)128 static int intel_pt_get_vmcs(const unsigned char *buf, size_t len,
129 struct intel_pt_pkt *packet)
130 {
131 unsigned int count = (52 - 5) >> 3;
132
133 if (count < 1 || count > 7)
134 return INTEL_PT_BAD_PACKET;
135
136 if (len < count + 2)
137 return INTEL_PT_NEED_MORE_BYTES;
138
139 packet->type = INTEL_PT_VMCS;
140 packet->count = count;
141 memcpy_le64(&packet->payload, buf + 2, count);
142
143 return count + 2;
144 }
145
intel_pt_get_ovf(struct intel_pt_pkt * packet)146 static int intel_pt_get_ovf(struct intel_pt_pkt *packet)
147 {
148 packet->type = INTEL_PT_OVF;
149 return 2;
150 }
151
intel_pt_get_psb(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)152 static int intel_pt_get_psb(const unsigned char *buf, size_t len,
153 struct intel_pt_pkt *packet)
154 {
155 int i;
156
157 if (len < 16)
158 return INTEL_PT_NEED_MORE_BYTES;
159
160 for (i = 2; i < 16; i += 2) {
161 if (buf[i] != 2 || buf[i + 1] != 0x82)
162 return INTEL_PT_BAD_PACKET;
163 }
164
165 packet->type = INTEL_PT_PSB;
166 return 16;
167 }
168
intel_pt_get_psbend(struct intel_pt_pkt * packet)169 static int intel_pt_get_psbend(struct intel_pt_pkt *packet)
170 {
171 packet->type = INTEL_PT_PSBEND;
172 return 2;
173 }
174
intel_pt_get_tma(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)175 static int intel_pt_get_tma(const unsigned char *buf, size_t len,
176 struct intel_pt_pkt *packet)
177 {
178 if (len < 7)
179 return INTEL_PT_NEED_MORE_BYTES;
180
181 packet->type = INTEL_PT_TMA;
182 packet->payload = buf[2] | (buf[3] << 8);
183 packet->count = buf[5] | ((buf[6] & BIT(0)) << 8);
184 return 7;
185 }
186
intel_pt_get_pad(struct intel_pt_pkt * packet)187 static int intel_pt_get_pad(struct intel_pt_pkt *packet)
188 {
189 packet->type = INTEL_PT_PAD;
190 return 1;
191 }
192
intel_pt_get_mnt(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)193 static int intel_pt_get_mnt(const unsigned char *buf, size_t len,
194 struct intel_pt_pkt *packet)
195 {
196 if (len < 11)
197 return INTEL_PT_NEED_MORE_BYTES;
198 packet->type = INTEL_PT_MNT;
199 memcpy_le64(&packet->payload, buf + 3, 8);
200 return 11
201 ;
202 }
203
intel_pt_get_3byte(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)204 static int intel_pt_get_3byte(const unsigned char *buf, size_t len,
205 struct intel_pt_pkt *packet)
206 {
207 if (len < 3)
208 return INTEL_PT_NEED_MORE_BYTES;
209
210 switch (buf[2]) {
211 case 0x88: /* MNT */
212 return intel_pt_get_mnt(buf, len, packet);
213 default:
214 return INTEL_PT_BAD_PACKET;
215 }
216 }
217
intel_pt_get_ptwrite(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)218 static int intel_pt_get_ptwrite(const unsigned char *buf, size_t len,
219 struct intel_pt_pkt *packet)
220 {
221 packet->count = (buf[1] >> 5) & 0x3;
222 packet->type = buf[1] & BIT(7) ? INTEL_PT_PTWRITE_IP :
223 INTEL_PT_PTWRITE;
224
225 switch (packet->count) {
226 case 0:
227 if (len < 6)
228 return INTEL_PT_NEED_MORE_BYTES;
229 packet->payload = le32_to_cpu(*(uint32_t *)(buf + 2));
230 return 6;
231 case 1:
232 if (len < 10)
233 return INTEL_PT_NEED_MORE_BYTES;
234 packet->payload = le64_to_cpu(*(uint64_t *)(buf + 2));
235 return 10;
236 default:
237 return INTEL_PT_BAD_PACKET;
238 }
239 }
240
intel_pt_get_exstop(struct intel_pt_pkt * packet)241 static int intel_pt_get_exstop(struct intel_pt_pkt *packet)
242 {
243 packet->type = INTEL_PT_EXSTOP;
244 return 2;
245 }
246
intel_pt_get_exstop_ip(struct intel_pt_pkt * packet)247 static int intel_pt_get_exstop_ip(struct intel_pt_pkt *packet)
248 {
249 packet->type = INTEL_PT_EXSTOP_IP;
250 return 2;
251 }
252
intel_pt_get_mwait(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)253 static int intel_pt_get_mwait(const unsigned char *buf, size_t len,
254 struct intel_pt_pkt *packet)
255 {
256 if (len < 10)
257 return INTEL_PT_NEED_MORE_BYTES;
258 packet->type = INTEL_PT_MWAIT;
259 packet->payload = le64_to_cpu(*(uint64_t *)(buf + 2));
260 return 10;
261 }
262
intel_pt_get_pwre(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)263 static int intel_pt_get_pwre(const unsigned char *buf, size_t len,
264 struct intel_pt_pkt *packet)
265 {
266 if (len < 4)
267 return INTEL_PT_NEED_MORE_BYTES;
268 packet->type = INTEL_PT_PWRE;
269 memcpy_le64(&packet->payload, buf + 2, 2);
270 return 4;
271 }
272
intel_pt_get_pwrx(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)273 static int intel_pt_get_pwrx(const unsigned char *buf, size_t len,
274 struct intel_pt_pkt *packet)
275 {
276 if (len < 7)
277 return INTEL_PT_NEED_MORE_BYTES;
278 packet->type = INTEL_PT_PWRX;
279 memcpy_le64(&packet->payload, buf + 2, 5);
280 return 7;
281 }
282
intel_pt_get_bbp(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)283 static int intel_pt_get_bbp(const unsigned char *buf, size_t len,
284 struct intel_pt_pkt *packet)
285 {
286 if (len < 3)
287 return INTEL_PT_NEED_MORE_BYTES;
288 packet->type = INTEL_PT_BBP;
289 packet->count = buf[2] >> 7;
290 packet->payload = buf[2] & 0x1f;
291 return 3;
292 }
293
intel_pt_get_bip_4(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)294 static int intel_pt_get_bip_4(const unsigned char *buf, size_t len,
295 struct intel_pt_pkt *packet)
296 {
297 if (len < 5)
298 return INTEL_PT_NEED_MORE_BYTES;
299 packet->type = INTEL_PT_BIP;
300 packet->count = buf[0] >> 3;
301 memcpy_le64(&packet->payload, buf + 1, 4);
302 return 5;
303 }
304
intel_pt_get_bip_8(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)305 static int intel_pt_get_bip_8(const unsigned char *buf, size_t len,
306 struct intel_pt_pkt *packet)
307 {
308 if (len < 9)
309 return INTEL_PT_NEED_MORE_BYTES;
310 packet->type = INTEL_PT_BIP;
311 packet->count = buf[0] >> 3;
312 memcpy_le64(&packet->payload, buf + 1, 8);
313 return 9;
314 }
315
intel_pt_get_bep(size_t len,struct intel_pt_pkt * packet)316 static int intel_pt_get_bep(size_t len, struct intel_pt_pkt *packet)
317 {
318 if (len < 2)
319 return INTEL_PT_NEED_MORE_BYTES;
320 packet->type = INTEL_PT_BEP;
321 return 2;
322 }
323
intel_pt_get_bep_ip(size_t len,struct intel_pt_pkt * packet)324 static int intel_pt_get_bep_ip(size_t len, struct intel_pt_pkt *packet)
325 {
326 if (len < 2)
327 return INTEL_PT_NEED_MORE_BYTES;
328 packet->type = INTEL_PT_BEP_IP;
329 return 2;
330 }
331
intel_pt_get_ext(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)332 static int intel_pt_get_ext(const unsigned char *buf, size_t len,
333 struct intel_pt_pkt *packet)
334 {
335 if (len < 2)
336 return INTEL_PT_NEED_MORE_BYTES;
337
338 if ((buf[1] & 0x1f) == 0x12)
339 return intel_pt_get_ptwrite(buf, len, packet);
340
341 switch (buf[1]) {
342 case 0xa3: /* Long TNT */
343 return intel_pt_get_long_tnt(buf, len, packet);
344 case 0x43: /* PIP */
345 return intel_pt_get_pip(buf, len, packet);
346 case 0x83: /* TraceStop */
347 return intel_pt_get_tracestop(packet);
348 case 0x03: /* CBR */
349 return intel_pt_get_cbr(buf, len, packet);
350 case 0xc8: /* VMCS */
351 return intel_pt_get_vmcs(buf, len, packet);
352 case 0xf3: /* OVF */
353 return intel_pt_get_ovf(packet);
354 case 0x82: /* PSB */
355 return intel_pt_get_psb(buf, len, packet);
356 case 0x23: /* PSBEND */
357 return intel_pt_get_psbend(packet);
358 case 0x73: /* TMA */
359 return intel_pt_get_tma(buf, len, packet);
360 case 0xC3: /* 3-byte header */
361 return intel_pt_get_3byte(buf, len, packet);
362 case 0x62: /* EXSTOP no IP */
363 return intel_pt_get_exstop(packet);
364 case 0xE2: /* EXSTOP with IP */
365 return intel_pt_get_exstop_ip(packet);
366 case 0xC2: /* MWAIT */
367 return intel_pt_get_mwait(buf, len, packet);
368 case 0x22: /* PWRE */
369 return intel_pt_get_pwre(buf, len, packet);
370 case 0xA2: /* PWRX */
371 return intel_pt_get_pwrx(buf, len, packet);
372 case 0x63: /* BBP */
373 return intel_pt_get_bbp(buf, len, packet);
374 case 0x33: /* BEP no IP */
375 return intel_pt_get_bep(len, packet);
376 case 0xb3: /* BEP with IP */
377 return intel_pt_get_bep_ip(len, packet);
378 default:
379 return INTEL_PT_BAD_PACKET;
380 }
381 }
382
intel_pt_get_short_tnt(unsigned int byte,struct intel_pt_pkt * packet)383 static int intel_pt_get_short_tnt(unsigned int byte,
384 struct intel_pt_pkt *packet)
385 {
386 int count;
387
388 for (count = 6; count; count--) {
389 if (byte & BIT(7))
390 break;
391 byte <<= 1;
392 }
393
394 packet->type = INTEL_PT_TNT;
395 packet->count = count;
396 packet->payload = (uint64_t)byte << 57;
397
398 return 1;
399 }
400
intel_pt_get_cyc(unsigned int byte,const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)401 static int intel_pt_get_cyc(unsigned int byte, const unsigned char *buf,
402 size_t len, struct intel_pt_pkt *packet)
403 {
404 unsigned int offs = 1, shift;
405 uint64_t payload = byte >> 3;
406
407 byte >>= 2;
408 len -= 1;
409 for (shift = 5; byte & 1; shift += 7) {
410 if (offs > 9)
411 return INTEL_PT_BAD_PACKET;
412 if (len < offs)
413 return INTEL_PT_NEED_MORE_BYTES;
414 byte = buf[offs++];
415 payload |= ((uint64_t)byte >> 1) << shift;
416 }
417
418 packet->type = INTEL_PT_CYC;
419 packet->payload = payload;
420 return offs;
421 }
422
intel_pt_get_ip(enum intel_pt_pkt_type type,unsigned int byte,const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)423 static int intel_pt_get_ip(enum intel_pt_pkt_type type, unsigned int byte,
424 const unsigned char *buf, size_t len,
425 struct intel_pt_pkt *packet)
426 {
427 int ip_len;
428
429 packet->count = byte >> 5;
430
431 switch (packet->count) {
432 case 0:
433 ip_len = 0;
434 break;
435 case 1:
436 if (len < 3)
437 return INTEL_PT_NEED_MORE_BYTES;
438 ip_len = 2;
439 packet->payload = le16_to_cpu(*(uint16_t *)(buf + 1));
440 break;
441 case 2:
442 if (len < 5)
443 return INTEL_PT_NEED_MORE_BYTES;
444 ip_len = 4;
445 packet->payload = le32_to_cpu(*(uint32_t *)(buf + 1));
446 break;
447 case 3:
448 case 4:
449 if (len < 7)
450 return INTEL_PT_NEED_MORE_BYTES;
451 ip_len = 6;
452 memcpy_le64(&packet->payload, buf + 1, 6);
453 break;
454 case 6:
455 if (len < 9)
456 return INTEL_PT_NEED_MORE_BYTES;
457 ip_len = 8;
458 packet->payload = le64_to_cpu(*(uint64_t *)(buf + 1));
459 break;
460 default:
461 return INTEL_PT_BAD_PACKET;
462 }
463
464 packet->type = type;
465
466 return ip_len + 1;
467 }
468
intel_pt_get_mode(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)469 static int intel_pt_get_mode(const unsigned char *buf, size_t len,
470 struct intel_pt_pkt *packet)
471 {
472 if (len < 2)
473 return INTEL_PT_NEED_MORE_BYTES;
474
475 switch (buf[1] >> 5) {
476 case 0:
477 packet->type = INTEL_PT_MODE_EXEC;
478 switch (buf[1] & 3) {
479 case 0:
480 packet->payload = 16;
481 break;
482 case 1:
483 packet->payload = 64;
484 break;
485 case 2:
486 packet->payload = 32;
487 break;
488 default:
489 return INTEL_PT_BAD_PACKET;
490 }
491 break;
492 case 1:
493 packet->type = INTEL_PT_MODE_TSX;
494 if ((buf[1] & 3) == 3)
495 return INTEL_PT_BAD_PACKET;
496 packet->payload = buf[1] & 3;
497 break;
498 default:
499 return INTEL_PT_BAD_PACKET;
500 }
501
502 return 2;
503 }
504
intel_pt_get_tsc(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)505 static int intel_pt_get_tsc(const unsigned char *buf, size_t len,
506 struct intel_pt_pkt *packet)
507 {
508 if (len < 8)
509 return INTEL_PT_NEED_MORE_BYTES;
510 packet->type = INTEL_PT_TSC;
511 memcpy_le64(&packet->payload, buf + 1, 7);
512 return 8;
513 }
514
intel_pt_get_mtc(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)515 static int intel_pt_get_mtc(const unsigned char *buf, size_t len,
516 struct intel_pt_pkt *packet)
517 {
518 if (len < 2)
519 return INTEL_PT_NEED_MORE_BYTES;
520 packet->type = INTEL_PT_MTC;
521 packet->payload = buf[1];
522 return 2;
523 }
524
intel_pt_do_get_packet(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet,enum intel_pt_pkt_ctx ctx)525 static int intel_pt_do_get_packet(const unsigned char *buf, size_t len,
526 struct intel_pt_pkt *packet,
527 enum intel_pt_pkt_ctx ctx)
528 {
529 unsigned int byte;
530
531 memset(packet, 0, sizeof(struct intel_pt_pkt));
532
533 if (!len)
534 return INTEL_PT_NEED_MORE_BYTES;
535
536 byte = buf[0];
537
538 switch (ctx) {
539 case INTEL_PT_NO_CTX:
540 break;
541 case INTEL_PT_BLK_4_CTX:
542 if ((byte & 0x7) == 4)
543 return intel_pt_get_bip_4(buf, len, packet);
544 break;
545 case INTEL_PT_BLK_8_CTX:
546 if ((byte & 0x7) == 4)
547 return intel_pt_get_bip_8(buf, len, packet);
548 break;
549 default:
550 break;
551 }
552
553 if (!(byte & BIT(0))) {
554 if (byte == 0)
555 return intel_pt_get_pad(packet);
556 if (byte == 2)
557 return intel_pt_get_ext(buf, len, packet);
558 return intel_pt_get_short_tnt(byte, packet);
559 }
560
561 if ((byte & 2))
562 return intel_pt_get_cyc(byte, buf, len, packet);
563
564 switch (byte & 0x1f) {
565 case 0x0D:
566 return intel_pt_get_ip(INTEL_PT_TIP, byte, buf, len, packet);
567 case 0x11:
568 return intel_pt_get_ip(INTEL_PT_TIP_PGE, byte, buf, len,
569 packet);
570 case 0x01:
571 return intel_pt_get_ip(INTEL_PT_TIP_PGD, byte, buf, len,
572 packet);
573 case 0x1D:
574 return intel_pt_get_ip(INTEL_PT_FUP, byte, buf, len, packet);
575 case 0x19:
576 switch (byte) {
577 case 0x99:
578 return intel_pt_get_mode(buf, len, packet);
579 case 0x19:
580 return intel_pt_get_tsc(buf, len, packet);
581 case 0x59:
582 return intel_pt_get_mtc(buf, len, packet);
583 default:
584 return INTEL_PT_BAD_PACKET;
585 }
586 default:
587 return INTEL_PT_BAD_PACKET;
588 }
589 }
590
intel_pt_upd_pkt_ctx(const struct intel_pt_pkt * packet,enum intel_pt_pkt_ctx * ctx)591 void intel_pt_upd_pkt_ctx(const struct intel_pt_pkt *packet,
592 enum intel_pt_pkt_ctx *ctx)
593 {
594 switch (packet->type) {
595 case INTEL_PT_BAD:
596 case INTEL_PT_PAD:
597 case INTEL_PT_TSC:
598 case INTEL_PT_TMA:
599 case INTEL_PT_MTC:
600 case INTEL_PT_FUP:
601 case INTEL_PT_CYC:
602 case INTEL_PT_CBR:
603 case INTEL_PT_MNT:
604 case INTEL_PT_EXSTOP:
605 case INTEL_PT_EXSTOP_IP:
606 case INTEL_PT_PWRE:
607 case INTEL_PT_PWRX:
608 case INTEL_PT_BIP:
609 break;
610 case INTEL_PT_TNT:
611 case INTEL_PT_TIP:
612 case INTEL_PT_TIP_PGD:
613 case INTEL_PT_TIP_PGE:
614 case INTEL_PT_MODE_EXEC:
615 case INTEL_PT_MODE_TSX:
616 case INTEL_PT_PIP:
617 case INTEL_PT_OVF:
618 case INTEL_PT_VMCS:
619 case INTEL_PT_TRACESTOP:
620 case INTEL_PT_PSB:
621 case INTEL_PT_PSBEND:
622 case INTEL_PT_PTWRITE:
623 case INTEL_PT_PTWRITE_IP:
624 case INTEL_PT_MWAIT:
625 case INTEL_PT_BEP:
626 case INTEL_PT_BEP_IP:
627 *ctx = INTEL_PT_NO_CTX;
628 break;
629 case INTEL_PT_BBP:
630 if (packet->count)
631 *ctx = INTEL_PT_BLK_4_CTX;
632 else
633 *ctx = INTEL_PT_BLK_8_CTX;
634 break;
635 default:
636 break;
637 }
638 }
639
intel_pt_get_packet(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet,enum intel_pt_pkt_ctx * ctx)640 int intel_pt_get_packet(const unsigned char *buf, size_t len,
641 struct intel_pt_pkt *packet, enum intel_pt_pkt_ctx *ctx)
642 {
643 int ret;
644
645 ret = intel_pt_do_get_packet(buf, len, packet, *ctx);
646 if (ret > 0) {
647 while (ret < 8 && len > (size_t)ret && !buf[ret])
648 ret += 1;
649 intel_pt_upd_pkt_ctx(packet, ctx);
650 }
651 return ret;
652 }
653
intel_pt_pkt_desc(const struct intel_pt_pkt * packet,char * buf,size_t buf_len)654 int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf,
655 size_t buf_len)
656 {
657 int ret, i, nr;
658 unsigned long long payload = packet->payload;
659 const char *name = intel_pt_pkt_name(packet->type);
660
661 switch (packet->type) {
662 case INTEL_PT_BAD:
663 case INTEL_PT_PAD:
664 case INTEL_PT_PSB:
665 case INTEL_PT_PSBEND:
666 case INTEL_PT_TRACESTOP:
667 case INTEL_PT_OVF:
668 return snprintf(buf, buf_len, "%s", name);
669 case INTEL_PT_TNT: {
670 size_t blen = buf_len;
671
672 ret = snprintf(buf, blen, "%s ", name);
673 if (ret < 0)
674 return ret;
675 buf += ret;
676 blen -= ret;
677 for (i = 0; i < packet->count; i++) {
678 if (payload & BIT63)
679 ret = snprintf(buf, blen, "T");
680 else
681 ret = snprintf(buf, blen, "N");
682 if (ret < 0)
683 return ret;
684 buf += ret;
685 blen -= ret;
686 payload <<= 1;
687 }
688 ret = snprintf(buf, blen, " (%d)", packet->count);
689 if (ret < 0)
690 return ret;
691 blen -= ret;
692 return buf_len - blen;
693 }
694 case INTEL_PT_TIP_PGD:
695 case INTEL_PT_TIP_PGE:
696 case INTEL_PT_TIP:
697 case INTEL_PT_FUP:
698 if (!(packet->count))
699 return snprintf(buf, buf_len, "%s no ip", name);
700 __fallthrough;
701 case INTEL_PT_CYC:
702 case INTEL_PT_VMCS:
703 case INTEL_PT_MTC:
704 case INTEL_PT_MNT:
705 case INTEL_PT_CBR:
706 case INTEL_PT_TSC:
707 return snprintf(buf, buf_len, "%s 0x%llx", name, payload);
708 case INTEL_PT_TMA:
709 return snprintf(buf, buf_len, "%s CTC 0x%x FC 0x%x", name,
710 (unsigned)payload, packet->count);
711 case INTEL_PT_MODE_EXEC:
712 return snprintf(buf, buf_len, "%s %lld", name, payload);
713 case INTEL_PT_MODE_TSX:
714 return snprintf(buf, buf_len, "%s TXAbort:%u InTX:%u",
715 name, (unsigned)(payload >> 1) & 1,
716 (unsigned)payload & 1);
717 case INTEL_PT_PIP:
718 nr = packet->payload & INTEL_PT_VMX_NR_FLAG ? 1 : 0;
719 payload &= ~INTEL_PT_VMX_NR_FLAG;
720 ret = snprintf(buf, buf_len, "%s 0x%llx (NR=%d)",
721 name, payload >> 1, nr);
722 return ret;
723 case INTEL_PT_PTWRITE:
724 return snprintf(buf, buf_len, "%s 0x%llx IP:0", name, payload);
725 case INTEL_PT_PTWRITE_IP:
726 return snprintf(buf, buf_len, "%s 0x%llx IP:1", name, payload);
727 case INTEL_PT_BEP:
728 case INTEL_PT_EXSTOP:
729 return snprintf(buf, buf_len, "%s IP:0", name);
730 case INTEL_PT_BEP_IP:
731 case INTEL_PT_EXSTOP_IP:
732 return snprintf(buf, buf_len, "%s IP:1", name);
733 case INTEL_PT_MWAIT:
734 return snprintf(buf, buf_len, "%s 0x%llx Hints 0x%x Extensions 0x%x",
735 name, payload, (unsigned int)(payload & 0xff),
736 (unsigned int)((payload >> 32) & 0x3));
737 case INTEL_PT_PWRE:
738 return snprintf(buf, buf_len, "%s 0x%llx HW:%u CState:%u Sub-CState:%u",
739 name, payload, !!(payload & 0x80),
740 (unsigned int)((payload >> 12) & 0xf),
741 (unsigned int)((payload >> 8) & 0xf));
742 case INTEL_PT_PWRX:
743 return snprintf(buf, buf_len, "%s 0x%llx Last CState:%u Deepest CState:%u Wake Reason 0x%x",
744 name, payload,
745 (unsigned int)((payload >> 4) & 0xf),
746 (unsigned int)(payload & 0xf),
747 (unsigned int)((payload >> 8) & 0xf));
748 case INTEL_PT_BBP:
749 return snprintf(buf, buf_len, "%s SZ %s-byte Type 0x%llx",
750 name, packet->count ? "4" : "8", payload);
751 case INTEL_PT_BIP:
752 return snprintf(buf, buf_len, "%s ID 0x%02x Value 0x%llx",
753 name, packet->count, payload);
754 default:
755 break;
756 }
757 return snprintf(buf, buf_len, "%s 0x%llx (%d)",
758 name, payload, packet->count);
759 }
760
