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/kernel.h>
12 #include <linux/compiler.h>
13 #include <asm-generic/unaligned.h>
14
15 #include "intel-pt-pkt-decoder.h"
16
17 #define BIT(n) (1 << (n))
18
19 #define BIT63 ((uint64_t)1 << 63)
20
21 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
22 #define memcpy_le64(d, s, n) do { \
23 memcpy((d), (s), (n)); \
24 *(d) = le64_to_cpu(*(d)); \
25 } while (0)
26 #else
27 #define memcpy_le64 memcpy
28 #endif
29
30 static const char * const packet_name[] = {
31 [INTEL_PT_BAD] = "Bad Packet!",
32 [INTEL_PT_PAD] = "PAD",
33 [INTEL_PT_TNT] = "TNT",
34 [INTEL_PT_TIP_PGD] = "TIP.PGD",
35 [INTEL_PT_TIP_PGE] = "TIP.PGE",
36 [INTEL_PT_TSC] = "TSC",
37 [INTEL_PT_TMA] = "TMA",
38 [INTEL_PT_MODE_EXEC] = "MODE.Exec",
39 [INTEL_PT_MODE_TSX] = "MODE.TSX",
40 [INTEL_PT_MTC] = "MTC",
41 [INTEL_PT_TIP] = "TIP",
42 [INTEL_PT_FUP] = "FUP",
43 [INTEL_PT_CYC] = "CYC",
44 [INTEL_PT_VMCS] = "VMCS",
45 [INTEL_PT_PSB] = "PSB",
46 [INTEL_PT_PSBEND] = "PSBEND",
47 [INTEL_PT_CBR] = "CBR",
48 [INTEL_PT_TRACESTOP] = "TraceSTOP",
49 [INTEL_PT_PIP] = "PIP",
50 [INTEL_PT_OVF] = "OVF",
51 [INTEL_PT_MNT] = "MNT",
52 [INTEL_PT_PTWRITE] = "PTWRITE",
53 [INTEL_PT_PTWRITE_IP] = "PTWRITE",
54 [INTEL_PT_EXSTOP] = "EXSTOP",
55 [INTEL_PT_EXSTOP_IP] = "EXSTOP",
56 [INTEL_PT_MWAIT] = "MWAIT",
57 [INTEL_PT_PWRE] = "PWRE",
58 [INTEL_PT_PWRX] = "PWRX",
59 [INTEL_PT_BBP] = "BBP",
60 [INTEL_PT_BIP] = "BIP",
61 [INTEL_PT_BEP] = "BEP",
62 [INTEL_PT_BEP_IP] = "BEP",
63 [INTEL_PT_CFE] = "CFE",
64 [INTEL_PT_CFE_IP] = "CFE",
65 [INTEL_PT_EVD] = "EVD",
66 };
67
intel_pt_pkt_name(enum intel_pt_pkt_type type)68 const char *intel_pt_pkt_name(enum intel_pt_pkt_type type)
69 {
70 return packet_name[type];
71 }
72
intel_pt_get_long_tnt(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)73 static int intel_pt_get_long_tnt(const unsigned char *buf, size_t len,
74 struct intel_pt_pkt *packet)
75 {
76 uint64_t payload;
77 int count;
78
79 if (len < 8)
80 return INTEL_PT_NEED_MORE_BYTES;
81
82 payload = get_unaligned_le64(buf);
83
84 for (count = 47; count; count--) {
85 if (payload & BIT63)
86 break;
87 payload <<= 1;
88 }
89
90 packet->type = INTEL_PT_TNT;
91 packet->count = count;
92 packet->payload = payload << 1;
93 return 8;
94 }
95
intel_pt_get_pip(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)96 static int intel_pt_get_pip(const unsigned char *buf, size_t len,
97 struct intel_pt_pkt *packet)
98 {
99 uint64_t payload = 0;
100
101 if (len < 8)
102 return INTEL_PT_NEED_MORE_BYTES;
103
104 packet->type = INTEL_PT_PIP;
105 memcpy_le64(&payload, buf + 2, 6);
106 packet->payload = payload;
107
108 return 8;
109 }
110
intel_pt_get_tracestop(struct intel_pt_pkt * packet)111 static int intel_pt_get_tracestop(struct intel_pt_pkt *packet)
112 {
113 packet->type = INTEL_PT_TRACESTOP;
114 return 2;
115 }
116
intel_pt_get_cbr(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)117 static int intel_pt_get_cbr(const unsigned char *buf, size_t len,
118 struct intel_pt_pkt *packet)
119 {
120 if (len < 4)
121 return INTEL_PT_NEED_MORE_BYTES;
122 packet->type = INTEL_PT_CBR;
123 packet->payload = get_unaligned_le16(buf + 2);
124 return 4;
125 }
126
intel_pt_get_vmcs(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)127 static int intel_pt_get_vmcs(const unsigned char *buf, size_t len,
128 struct intel_pt_pkt *packet)
129 {
130 if (len < 7)
131 return INTEL_PT_NEED_MORE_BYTES;
132
133 packet->type = INTEL_PT_VMCS;
134 packet->count = 5;
135 memcpy_le64(&packet->payload, buf + 2, 5);
136
137 return 7;
138 }
139
intel_pt_get_ovf(struct intel_pt_pkt * packet)140 static int intel_pt_get_ovf(struct intel_pt_pkt *packet)
141 {
142 packet->type = INTEL_PT_OVF;
143 return 2;
144 }
145
intel_pt_get_psb(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)146 static int intel_pt_get_psb(const unsigned char *buf, size_t len,
147 struct intel_pt_pkt *packet)
148 {
149 int i;
150
151 if (len < 16)
152 return INTEL_PT_NEED_MORE_BYTES;
153
154 for (i = 2; i < 16; i += 2) {
155 if (buf[i] != 2 || buf[i + 1] != 0x82)
156 return INTEL_PT_BAD_PACKET;
157 }
158
159 packet->type = INTEL_PT_PSB;
160 return 16;
161 }
162
intel_pt_get_psbend(struct intel_pt_pkt * packet)163 static int intel_pt_get_psbend(struct intel_pt_pkt *packet)
164 {
165 packet->type = INTEL_PT_PSBEND;
166 return 2;
167 }
168
intel_pt_get_tma(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)169 static int intel_pt_get_tma(const unsigned char *buf, size_t len,
170 struct intel_pt_pkt *packet)
171 {
172 if (len < 7)
173 return INTEL_PT_NEED_MORE_BYTES;
174
175 packet->type = INTEL_PT_TMA;
176 packet->payload = buf[2] | (buf[3] << 8);
177 packet->count = buf[5] | ((buf[6] & BIT(0)) << 8);
178 return 7;
179 }
180
intel_pt_get_pad(struct intel_pt_pkt * packet)181 static int intel_pt_get_pad(struct intel_pt_pkt *packet)
182 {
183 packet->type = INTEL_PT_PAD;
184 return 1;
185 }
186
intel_pt_get_mnt(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)187 static int intel_pt_get_mnt(const unsigned char *buf, size_t len,
188 struct intel_pt_pkt *packet)
189 {
190 if (len < 11)
191 return INTEL_PT_NEED_MORE_BYTES;
192 packet->type = INTEL_PT_MNT;
193 packet->payload = get_unaligned_le64(buf + 3);
194 return 11;
195 }
196
intel_pt_get_3byte(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)197 static int intel_pt_get_3byte(const unsigned char *buf, size_t len,
198 struct intel_pt_pkt *packet)
199 {
200 if (len < 3)
201 return INTEL_PT_NEED_MORE_BYTES;
202
203 switch (buf[2]) {
204 case 0x88: /* MNT */
205 return intel_pt_get_mnt(buf, len, packet);
206 default:
207 return INTEL_PT_BAD_PACKET;
208 }
209 }
210
intel_pt_get_ptwrite(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)211 static int intel_pt_get_ptwrite(const unsigned char *buf, size_t len,
212 struct intel_pt_pkt *packet)
213 {
214 packet->count = (buf[1] >> 5) & 0x3;
215 packet->type = buf[1] & BIT(7) ? INTEL_PT_PTWRITE_IP :
216 INTEL_PT_PTWRITE;
217
218 switch (packet->count) {
219 case 0:
220 if (len < 6)
221 return INTEL_PT_NEED_MORE_BYTES;
222 packet->payload = get_unaligned_le32(buf + 2);
223 return 6;
224 case 1:
225 if (len < 10)
226 return INTEL_PT_NEED_MORE_BYTES;
227 packet->payload = get_unaligned_le64(buf + 2);
228 return 10;
229 default:
230 return INTEL_PT_BAD_PACKET;
231 }
232 }
233
intel_pt_get_exstop(struct intel_pt_pkt * packet)234 static int intel_pt_get_exstop(struct intel_pt_pkt *packet)
235 {
236 packet->type = INTEL_PT_EXSTOP;
237 return 2;
238 }
239
intel_pt_get_exstop_ip(struct intel_pt_pkt * packet)240 static int intel_pt_get_exstop_ip(struct intel_pt_pkt *packet)
241 {
242 packet->type = INTEL_PT_EXSTOP_IP;
243 return 2;
244 }
245
intel_pt_get_mwait(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)246 static int intel_pt_get_mwait(const unsigned char *buf, size_t len,
247 struct intel_pt_pkt *packet)
248 {
249 if (len < 10)
250 return INTEL_PT_NEED_MORE_BYTES;
251 packet->type = INTEL_PT_MWAIT;
252 packet->payload = get_unaligned_le64(buf + 2);
253 return 10;
254 }
255
intel_pt_get_pwre(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)256 static int intel_pt_get_pwre(const unsigned char *buf, size_t len,
257 struct intel_pt_pkt *packet)
258 {
259 if (len < 4)
260 return INTEL_PT_NEED_MORE_BYTES;
261 packet->type = INTEL_PT_PWRE;
262 memcpy_le64(&packet->payload, buf + 2, 2);
263 return 4;
264 }
265
intel_pt_get_pwrx(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)266 static int intel_pt_get_pwrx(const unsigned char *buf, size_t len,
267 struct intel_pt_pkt *packet)
268 {
269 if (len < 7)
270 return INTEL_PT_NEED_MORE_BYTES;
271 packet->type = INTEL_PT_PWRX;
272 memcpy_le64(&packet->payload, buf + 2, 5);
273 return 7;
274 }
275
intel_pt_get_bbp(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)276 static int intel_pt_get_bbp(const unsigned char *buf, size_t len,
277 struct intel_pt_pkt *packet)
278 {
279 if (len < 3)
280 return INTEL_PT_NEED_MORE_BYTES;
281 packet->type = INTEL_PT_BBP;
282 packet->count = buf[2] >> 7;
283 packet->payload = buf[2] & 0x1f;
284 return 3;
285 }
286
intel_pt_get_bip_4(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)287 static int intel_pt_get_bip_4(const unsigned char *buf, size_t len,
288 struct intel_pt_pkt *packet)
289 {
290 if (len < 5)
291 return INTEL_PT_NEED_MORE_BYTES;
292 packet->type = INTEL_PT_BIP;
293 packet->count = buf[0] >> 3;
294 memcpy_le64(&packet->payload, buf + 1, 4);
295 return 5;
296 }
297
intel_pt_get_bip_8(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)298 static int intel_pt_get_bip_8(const unsigned char *buf, size_t len,
299 struct intel_pt_pkt *packet)
300 {
301 if (len < 9)
302 return INTEL_PT_NEED_MORE_BYTES;
303 packet->type = INTEL_PT_BIP;
304 packet->count = buf[0] >> 3;
305 packet->payload = get_unaligned_le64(buf + 1);
306 return 9;
307 }
308
intel_pt_get_bep(size_t len,struct intel_pt_pkt * packet)309 static int intel_pt_get_bep(size_t len, struct intel_pt_pkt *packet)
310 {
311 if (len < 2)
312 return INTEL_PT_NEED_MORE_BYTES;
313 packet->type = INTEL_PT_BEP;
314 return 2;
315 }
316
intel_pt_get_bep_ip(size_t len,struct intel_pt_pkt * packet)317 static int intel_pt_get_bep_ip(size_t len, struct intel_pt_pkt *packet)
318 {
319 if (len < 2)
320 return INTEL_PT_NEED_MORE_BYTES;
321 packet->type = INTEL_PT_BEP_IP;
322 return 2;
323 }
324
intel_pt_get_cfe(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)325 static int intel_pt_get_cfe(const unsigned char *buf, size_t len,
326 struct intel_pt_pkt *packet)
327 {
328 if (len < 4)
329 return INTEL_PT_NEED_MORE_BYTES;
330 packet->type = buf[2] & 0x80 ? INTEL_PT_CFE_IP : INTEL_PT_CFE;
331 packet->count = buf[2] & 0x1f;
332 packet->payload = buf[3];
333 return 4;
334 }
335
intel_pt_get_evd(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)336 static int intel_pt_get_evd(const unsigned char *buf, size_t len,
337 struct intel_pt_pkt *packet)
338 {
339 if (len < 11)
340 return INTEL_PT_NEED_MORE_BYTES;
341 packet->type = INTEL_PT_EVD;
342 packet->count = buf[2] & 0x3f;
343 packet->payload = buf[3];
344 packet->payload = get_unaligned_le64(buf + 3);
345 return 11;
346 }
347
intel_pt_get_ext(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)348 static int intel_pt_get_ext(const unsigned char *buf, size_t len,
349 struct intel_pt_pkt *packet)
350 {
351 if (len < 2)
352 return INTEL_PT_NEED_MORE_BYTES;
353
354 if ((buf[1] & 0x1f) == 0x12)
355 return intel_pt_get_ptwrite(buf, len, packet);
356
357 switch (buf[1]) {
358 case 0xa3: /* Long TNT */
359 return intel_pt_get_long_tnt(buf, len, packet);
360 case 0x43: /* PIP */
361 return intel_pt_get_pip(buf, len, packet);
362 case 0x83: /* TraceStop */
363 return intel_pt_get_tracestop(packet);
364 case 0x03: /* CBR */
365 return intel_pt_get_cbr(buf, len, packet);
366 case 0xc8: /* VMCS */
367 return intel_pt_get_vmcs(buf, len, packet);
368 case 0xf3: /* OVF */
369 return intel_pt_get_ovf(packet);
370 case 0x82: /* PSB */
371 return intel_pt_get_psb(buf, len, packet);
372 case 0x23: /* PSBEND */
373 return intel_pt_get_psbend(packet);
374 case 0x73: /* TMA */
375 return intel_pt_get_tma(buf, len, packet);
376 case 0xC3: /* 3-byte header */
377 return intel_pt_get_3byte(buf, len, packet);
378 case 0x62: /* EXSTOP no IP */
379 return intel_pt_get_exstop(packet);
380 case 0xE2: /* EXSTOP with IP */
381 return intel_pt_get_exstop_ip(packet);
382 case 0xC2: /* MWAIT */
383 return intel_pt_get_mwait(buf, len, packet);
384 case 0x22: /* PWRE */
385 return intel_pt_get_pwre(buf, len, packet);
386 case 0xA2: /* PWRX */
387 return intel_pt_get_pwrx(buf, len, packet);
388 case 0x63: /* BBP */
389 return intel_pt_get_bbp(buf, len, packet);
390 case 0x33: /* BEP no IP */
391 return intel_pt_get_bep(len, packet);
392 case 0xb3: /* BEP with IP */
393 return intel_pt_get_bep_ip(len, packet);
394 case 0x13: /* CFE */
395 return intel_pt_get_cfe(buf, len, packet);
396 case 0x53: /* EVD */
397 return intel_pt_get_evd(buf, len, packet);
398 default:
399 return INTEL_PT_BAD_PACKET;
400 }
401 }
402
intel_pt_get_short_tnt(unsigned int byte,struct intel_pt_pkt * packet)403 static int intel_pt_get_short_tnt(unsigned int byte,
404 struct intel_pt_pkt *packet)
405 {
406 int count;
407
408 for (count = 6; count; count--) {
409 if (byte & BIT(7))
410 break;
411 byte <<= 1;
412 }
413
414 packet->type = INTEL_PT_TNT;
415 packet->count = count;
416 packet->payload = (uint64_t)byte << 57;
417
418 return 1;
419 }
420
intel_pt_get_cyc(unsigned int byte,const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)421 static int intel_pt_get_cyc(unsigned int byte, const unsigned char *buf,
422 size_t len, struct intel_pt_pkt *packet)
423 {
424 unsigned int offs = 1, shift;
425 uint64_t payload = byte >> 3;
426
427 byte >>= 2;
428 len -= 1;
429 for (shift = 5; byte & 1; shift += 7) {
430 if (offs > 9)
431 return INTEL_PT_BAD_PACKET;
432 if (len < offs)
433 return INTEL_PT_NEED_MORE_BYTES;
434 byte = buf[offs++];
435 payload |= ((uint64_t)byte >> 1) << shift;
436 }
437
438 packet->type = INTEL_PT_CYC;
439 packet->payload = payload;
440 return offs;
441 }
442
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)443 static int intel_pt_get_ip(enum intel_pt_pkt_type type, unsigned int byte,
444 const unsigned char *buf, size_t len,
445 struct intel_pt_pkt *packet)
446 {
447 int ip_len;
448
449 packet->count = byte >> 5;
450
451 switch (packet->count) {
452 case 0:
453 ip_len = 0;
454 break;
455 case 1:
456 if (len < 3)
457 return INTEL_PT_NEED_MORE_BYTES;
458 ip_len = 2;
459 packet->payload = get_unaligned_le16(buf + 1);
460 break;
461 case 2:
462 if (len < 5)
463 return INTEL_PT_NEED_MORE_BYTES;
464 ip_len = 4;
465 packet->payload = get_unaligned_le32(buf + 1);
466 break;
467 case 3:
468 case 4:
469 if (len < 7)
470 return INTEL_PT_NEED_MORE_BYTES;
471 ip_len = 6;
472 memcpy_le64(&packet->payload, buf + 1, 6);
473 break;
474 case 6:
475 if (len < 9)
476 return INTEL_PT_NEED_MORE_BYTES;
477 ip_len = 8;
478 packet->payload = get_unaligned_le64(buf + 1);
479 break;
480 default:
481 return INTEL_PT_BAD_PACKET;
482 }
483
484 packet->type = type;
485
486 return ip_len + 1;
487 }
488
intel_pt_get_mode(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)489 static int intel_pt_get_mode(const unsigned char *buf, size_t len,
490 struct intel_pt_pkt *packet)
491 {
492 if (len < 2)
493 return INTEL_PT_NEED_MORE_BYTES;
494
495 switch (buf[1] >> 5) {
496 case 0:
497 packet->type = INTEL_PT_MODE_EXEC;
498 packet->count = buf[1];
499 switch (buf[1] & 3) {
500 case 0:
501 packet->payload = 16;
502 break;
503 case 1:
504 packet->payload = 64;
505 break;
506 case 2:
507 packet->payload = 32;
508 break;
509 default:
510 return INTEL_PT_BAD_PACKET;
511 }
512 break;
513 case 1:
514 packet->type = INTEL_PT_MODE_TSX;
515 if ((buf[1] & 3) == 3)
516 return INTEL_PT_BAD_PACKET;
517 packet->payload = buf[1] & 3;
518 break;
519 default:
520 return INTEL_PT_BAD_PACKET;
521 }
522
523 return 2;
524 }
525
intel_pt_get_tsc(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)526 static int intel_pt_get_tsc(const unsigned char *buf, size_t len,
527 struct intel_pt_pkt *packet)
528 {
529 if (len < 8)
530 return INTEL_PT_NEED_MORE_BYTES;
531 packet->type = INTEL_PT_TSC;
532 memcpy_le64(&packet->payload, buf + 1, 7);
533 return 8;
534 }
535
intel_pt_get_mtc(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet)536 static int intel_pt_get_mtc(const unsigned char *buf, size_t len,
537 struct intel_pt_pkt *packet)
538 {
539 if (len < 2)
540 return INTEL_PT_NEED_MORE_BYTES;
541 packet->type = INTEL_PT_MTC;
542 packet->payload = buf[1];
543 return 2;
544 }
545
intel_pt_do_get_packet(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet,enum intel_pt_pkt_ctx ctx)546 static int intel_pt_do_get_packet(const unsigned char *buf, size_t len,
547 struct intel_pt_pkt *packet,
548 enum intel_pt_pkt_ctx ctx)
549 {
550 unsigned int byte;
551
552 memset(packet, 0, sizeof(struct intel_pt_pkt));
553
554 if (!len)
555 return INTEL_PT_NEED_MORE_BYTES;
556
557 byte = buf[0];
558
559 switch (ctx) {
560 case INTEL_PT_NO_CTX:
561 break;
562 case INTEL_PT_BLK_4_CTX:
563 if ((byte & 0x7) == 4)
564 return intel_pt_get_bip_4(buf, len, packet);
565 break;
566 case INTEL_PT_BLK_8_CTX:
567 if ((byte & 0x7) == 4)
568 return intel_pt_get_bip_8(buf, len, packet);
569 break;
570 default:
571 break;
572 }
573
574 if (!(byte & BIT(0))) {
575 if (byte == 0)
576 return intel_pt_get_pad(packet);
577 if (byte == 2)
578 return intel_pt_get_ext(buf, len, packet);
579 return intel_pt_get_short_tnt(byte, packet);
580 }
581
582 if ((byte & 2))
583 return intel_pt_get_cyc(byte, buf, len, packet);
584
585 switch (byte & 0x1f) {
586 case 0x0D:
587 return intel_pt_get_ip(INTEL_PT_TIP, byte, buf, len, packet);
588 case 0x11:
589 return intel_pt_get_ip(INTEL_PT_TIP_PGE, byte, buf, len,
590 packet);
591 case 0x01:
592 return intel_pt_get_ip(INTEL_PT_TIP_PGD, byte, buf, len,
593 packet);
594 case 0x1D:
595 return intel_pt_get_ip(INTEL_PT_FUP, byte, buf, len, packet);
596 case 0x19:
597 switch (byte) {
598 case 0x99:
599 return intel_pt_get_mode(buf, len, packet);
600 case 0x19:
601 return intel_pt_get_tsc(buf, len, packet);
602 case 0x59:
603 return intel_pt_get_mtc(buf, len, packet);
604 default:
605 return INTEL_PT_BAD_PACKET;
606 }
607 default:
608 return INTEL_PT_BAD_PACKET;
609 }
610 }
611
intel_pt_upd_pkt_ctx(const struct intel_pt_pkt * packet,enum intel_pt_pkt_ctx * ctx)612 void intel_pt_upd_pkt_ctx(const struct intel_pt_pkt *packet,
613 enum intel_pt_pkt_ctx *ctx)
614 {
615 switch (packet->type) {
616 case INTEL_PT_BAD:
617 case INTEL_PT_PAD:
618 case INTEL_PT_TSC:
619 case INTEL_PT_TMA:
620 case INTEL_PT_MTC:
621 case INTEL_PT_FUP:
622 case INTEL_PT_CYC:
623 case INTEL_PT_CBR:
624 case INTEL_PT_MNT:
625 case INTEL_PT_EXSTOP:
626 case INTEL_PT_EXSTOP_IP:
627 case INTEL_PT_PWRE:
628 case INTEL_PT_PWRX:
629 case INTEL_PT_BIP:
630 break;
631 case INTEL_PT_TNT:
632 case INTEL_PT_TIP:
633 case INTEL_PT_TIP_PGD:
634 case INTEL_PT_TIP_PGE:
635 case INTEL_PT_MODE_EXEC:
636 case INTEL_PT_MODE_TSX:
637 case INTEL_PT_PIP:
638 case INTEL_PT_OVF:
639 case INTEL_PT_VMCS:
640 case INTEL_PT_TRACESTOP:
641 case INTEL_PT_PSB:
642 case INTEL_PT_PSBEND:
643 case INTEL_PT_PTWRITE:
644 case INTEL_PT_PTWRITE_IP:
645 case INTEL_PT_MWAIT:
646 case INTEL_PT_BEP:
647 case INTEL_PT_BEP_IP:
648 case INTEL_PT_CFE:
649 case INTEL_PT_CFE_IP:
650 case INTEL_PT_EVD:
651 *ctx = INTEL_PT_NO_CTX;
652 break;
653 case INTEL_PT_BBP:
654 if (packet->count)
655 *ctx = INTEL_PT_BLK_4_CTX;
656 else
657 *ctx = INTEL_PT_BLK_8_CTX;
658 break;
659 default:
660 break;
661 }
662 }
663
intel_pt_get_packet(const unsigned char * buf,size_t len,struct intel_pt_pkt * packet,enum intel_pt_pkt_ctx * ctx)664 int intel_pt_get_packet(const unsigned char *buf, size_t len,
665 struct intel_pt_pkt *packet, enum intel_pt_pkt_ctx *ctx)
666 {
667 int ret;
668
669 ret = intel_pt_do_get_packet(buf, len, packet, *ctx);
670 if (ret > 0) {
671 while (ret < 8 && len > (size_t)ret && !buf[ret])
672 ret += 1;
673 intel_pt_upd_pkt_ctx(packet, ctx);
674 }
675 return ret;
676 }
677
intel_pt_pkt_desc(const struct intel_pt_pkt * packet,char * buf,size_t buf_len)678 int intel_pt_pkt_desc(const struct intel_pt_pkt *packet, char *buf,
679 size_t buf_len)
680 {
681 int ret, i, nr;
682 unsigned long long payload = packet->payload;
683 const char *name = intel_pt_pkt_name(packet->type);
684
685 switch (packet->type) {
686 case INTEL_PT_BAD:
687 case INTEL_PT_PAD:
688 case INTEL_PT_PSB:
689 case INTEL_PT_PSBEND:
690 case INTEL_PT_TRACESTOP:
691 case INTEL_PT_OVF:
692 return snprintf(buf, buf_len, "%s", name);
693 case INTEL_PT_TNT: {
694 size_t blen = buf_len;
695
696 ret = snprintf(buf, blen, "%s ", name);
697 if (ret < 0)
698 return ret;
699 buf += ret;
700 blen -= ret;
701 for (i = 0; i < packet->count; i++) {
702 if (payload & BIT63)
703 ret = snprintf(buf, blen, "T");
704 else
705 ret = snprintf(buf, blen, "N");
706 if (ret < 0)
707 return ret;
708 buf += ret;
709 blen -= ret;
710 payload <<= 1;
711 }
712 ret = snprintf(buf, blen, " (%d)", packet->count);
713 if (ret < 0)
714 return ret;
715 blen -= ret;
716 return buf_len - blen;
717 }
718 case INTEL_PT_TIP_PGD:
719 case INTEL_PT_TIP_PGE:
720 case INTEL_PT_TIP:
721 case INTEL_PT_FUP:
722 if (!(packet->count))
723 return snprintf(buf, buf_len, "%s no ip", name);
724 fallthrough;
725 case INTEL_PT_CYC:
726 case INTEL_PT_VMCS:
727 case INTEL_PT_MTC:
728 case INTEL_PT_MNT:
729 case INTEL_PT_CBR:
730 case INTEL_PT_TSC:
731 return snprintf(buf, buf_len, "%s 0x%llx", name, payload);
732 case INTEL_PT_TMA:
733 return snprintf(buf, buf_len, "%s CTC 0x%x FC 0x%x", name,
734 (unsigned)payload, packet->count);
735 case INTEL_PT_MODE_EXEC:
736 return snprintf(buf, buf_len, "%s IF:%d %lld",
737 name, !!(packet->count & 4), payload);
738 case INTEL_PT_MODE_TSX:
739 return snprintf(buf, buf_len, "%s TXAbort:%u InTX:%u",
740 name, (unsigned)(payload >> 1) & 1,
741 (unsigned)payload & 1);
742 case INTEL_PT_PIP:
743 nr = packet->payload & INTEL_PT_VMX_NR_FLAG ? 1 : 0;
744 payload &= ~INTEL_PT_VMX_NR_FLAG;
745 ret = snprintf(buf, buf_len, "%s 0x%llx (NR=%d)",
746 name, payload >> 1, nr);
747 return ret;
748 case INTEL_PT_PTWRITE:
749 return snprintf(buf, buf_len, "%s 0x%llx IP:0", name, payload);
750 case INTEL_PT_PTWRITE_IP:
751 return snprintf(buf, buf_len, "%s 0x%llx IP:1", name, payload);
752 case INTEL_PT_BEP:
753 case INTEL_PT_EXSTOP:
754 return snprintf(buf, buf_len, "%s IP:0", name);
755 case INTEL_PT_BEP_IP:
756 case INTEL_PT_EXSTOP_IP:
757 return snprintf(buf, buf_len, "%s IP:1", name);
758 case INTEL_PT_MWAIT:
759 return snprintf(buf, buf_len, "%s 0x%llx Hints 0x%x Extensions 0x%x",
760 name, payload, (unsigned int)(payload & 0xff),
761 (unsigned int)((payload >> 32) & 0x3));
762 case INTEL_PT_PWRE:
763 return snprintf(buf, buf_len, "%s 0x%llx HW:%u CState:%u Sub-CState:%u",
764 name, payload, !!(payload & 0x80),
765 (unsigned int)((payload >> 12) & 0xf),
766 (unsigned int)((payload >> 8) & 0xf));
767 case INTEL_PT_PWRX:
768 return snprintf(buf, buf_len, "%s 0x%llx Last CState:%u Deepest CState:%u Wake Reason 0x%x",
769 name, payload,
770 (unsigned int)((payload >> 4) & 0xf),
771 (unsigned int)(payload & 0xf),
772 (unsigned int)((payload >> 8) & 0xf));
773 case INTEL_PT_BBP:
774 return snprintf(buf, buf_len, "%s SZ %s-byte Type 0x%llx",
775 name, packet->count ? "4" : "8", payload);
776 case INTEL_PT_BIP:
777 return snprintf(buf, buf_len, "%s ID 0x%02x Value 0x%llx",
778 name, packet->count, payload);
779 case INTEL_PT_CFE:
780 case INTEL_PT_CFE_IP:
781 return snprintf(buf, buf_len, "%s IP:%d Type 0x%02x Vector 0x%llx",
782 name, packet->type == INTEL_PT_CFE_IP, packet->count, payload);
783 case INTEL_PT_EVD:
784 return snprintf(buf, buf_len, "%s Type 0x%02x Payload 0x%llx",
785 name, packet->count, payload);
786 default:
787 break;
788 }
789 return snprintf(buf, buf_len, "%s 0x%llx (%d)",
790 name, payload, packet->count);
791 }
792