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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / arch / x86 / mm / pf_in.c
bloba235869532bcc822a6aaf1760c83ca29d192e73f
1 /*
2 * Fault Injection Test harness (FI)
3 * Copyright (C) Intel Crop.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
18 * USA.
19 *
20 */
21
22 /* Id: pf_in.c,v 1.1.1.1 2002/11/12 05:56:32 brlock Exp
23 * Copyright by Intel Crop., 2002
24 * Louis Zhuang (louis.zhuang@intel.com)
25 *
26 * Bjorn Steinbrink (B.Steinbrink@gmx.de), 2007
27 */
28
29 #include <linux/ptrace.h> /* struct pt_regs */
30 #include "pf_in.h"
31
32 #ifdef __i386__
33 /* IA32 Manual 3, 2-1 */
34 static unsigned char prefix_codes[] = {
35 0xF0, 0xF2, 0xF3, 0x2E, 0x36, 0x3E, 0x26, 0x64,
36 0x65, 0x66, 0x67
37 };
38 /* IA32 Manual 3, 3-432*/
39 static unsigned int reg_rop[] = {
40 0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
41 };
42 static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
43 static unsigned int imm_wop[] = { 0xC6, 0xC7 };
44 /* IA32 Manual 3, 3-432*/
45 static unsigned int rw8[] = { 0x88, 0x8A, 0xC6, 0xAA };
46 static unsigned int rw32[] = {
47 0x89, 0x8B, 0xC7, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
48 };
49 static unsigned int mw8[] = { 0x88, 0x8A, 0xC6, 0xB60F, 0xBE0F, 0xAA };
50 static unsigned int mw16[] = { 0xB70F, 0xBF0F };
51 static unsigned int mw32[] = { 0x89, 0x8B, 0xC7, 0xAB };
52 static unsigned int mw64[] = {};
53 #else /* not __i386__ */
54 static unsigned char prefix_codes[] = {
55 0x66, 0x67, 0x2E, 0x3E, 0x26, 0x64, 0x65, 0x36,
56 0xF0, 0xF3, 0xF2,
57 /* REX Prefixes */
58 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
59 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
60 };
61 /* AMD64 Manual 3, Appendix A*/
62 static unsigned int reg_rop[] = {
63 0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
64 };
65 static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
66 static unsigned int imm_wop[] = { 0xC6, 0xC7 };
67 static unsigned int rw8[] = { 0xC6, 0x88, 0x8A, 0xAA };
68 static unsigned int rw32[] = {
69 0xC7, 0x89, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
70 };
71 /* 8 bit only */
72 static unsigned int mw8[] = { 0xC6, 0x88, 0x8A, 0xB60F, 0xBE0F, 0xAA };
73 /* 16 bit only */
74 static unsigned int mw16[] = { 0xB70F, 0xBF0F };
75 /* 16 or 32 bit */
76 static unsigned int mw32[] = { 0xC7 };
77 /* 16, 32 or 64 bit */
78 static unsigned int mw64[] = { 0x89, 0x8B, 0xAB };
79 #endif /* not __i386__ */
80
81 struct prefix_bits {
82 unsigned shorted:1;
83 unsigned enlarged:1;
84 unsigned rexr:1;
85 unsigned rex:1;
86 };
87
88 static int skip_prefix(unsigned char *addr, struct prefix_bits *prf)
89 {
90 int i;
91 unsigned char *p = addr;
92 prf->shorted = 0;
93 prf->enlarged = 0;
94 prf->rexr = 0;
95 prf->rex = 0;
96
97 restart:
98 for (i = 0; i < ARRAY_SIZE(prefix_codes); i++) {
99 if (*p == prefix_codes[i]) {
100 if (*p == 0x66)
101 prf->shorted = 1;
102 #ifdef __amd64__
103 if ((*p & 0xf8) == 0x48)
104 prf->enlarged = 1;
105 if ((*p & 0xf4) == 0x44)
106 prf->rexr = 1;
107 if ((*p & 0xf0) == 0x40)
108 prf->rex = 1;
109 #endif
110 p++;
111 goto restart;
112 }
113 }
114
115 return (p - addr);
116 }
117
118 static int get_opcode(unsigned char *addr, unsigned int *opcode)
119 {
120 int len;
121
122 if (*addr == 0x0F) {
123 /* 0x0F is extension instruction */
124 *opcode = *(unsigned short *)addr;
125 len = 2;
126 } else {
127 *opcode = *addr;
128 len = 1;
129 }
130
131 return len;
132 }
133
134 #define CHECK_OP_TYPE(opcode, array, type) \
135 for (i = 0; i < ARRAY_SIZE(array); i++) { \
136 if (array[i] == opcode) { \
137 rv = type; \
138 goto exit; \
139 } \
140 }
141
142 enum reason_type get_ins_type(unsigned long ins_addr)
143 {
144 unsigned int opcode;
145 unsigned char *p;
146 struct prefix_bits prf;
147 int i;
148 enum reason_type rv = OTHERS;
149
150 p = (unsigned char *)ins_addr;
151 p += skip_prefix(p, &prf);
152 p += get_opcode(p, &opcode);
153
154 CHECK_OP_TYPE(opcode, reg_rop, REG_READ);
155 CHECK_OP_TYPE(opcode, reg_wop, REG_WRITE);
156 CHECK_OP_TYPE(opcode, imm_wop, IMM_WRITE);
157
158 exit:
159 return rv;
160 }
161 #undef CHECK_OP_TYPE
162
163 static unsigned int get_ins_reg_width(unsigned long ins_addr)
164 {
165 unsigned int opcode;
166 unsigned char *p;
167 struct prefix_bits prf;
168 int i;
169
170 p = (unsigned char *)ins_addr;
171 p += skip_prefix(p, &prf);
172 p += get_opcode(p, &opcode);
173
174 for (i = 0; i < ARRAY_SIZE(rw8); i++)
175 if (rw8[i] == opcode)
176 return 1;
177
178 for (i = 0; i < ARRAY_SIZE(rw32); i++)
179 if (rw32[i] == opcode)
180 return prf.shorted ? 2 : (prf.enlarged ? 8 : 4);
181
182 printk(KERN_ERR "mmiotrace: Unknown opcode 0x%02x\n", opcode);
183 return 0;
184 }
185
186 unsigned int get_ins_mem_width(unsigned long ins_addr)
187 {
188 unsigned int opcode;
189 unsigned char *p;
190 struct prefix_bits prf;
191 int i;
192
193 p = (unsigned char *)ins_addr;
194 p += skip_prefix(p, &prf);
195 p += get_opcode(p, &opcode);
196
197 for (i = 0; i < ARRAY_SIZE(mw8); i++)
198 if (mw8[i] == opcode)
199 return 1;
200
201 for (i = 0; i < ARRAY_SIZE(mw16); i++)
202 if (mw16[i] == opcode)
203 return 2;
204
205 for (i = 0; i < ARRAY_SIZE(mw32); i++)
206 if (mw32[i] == opcode)
207 return prf.shorted ? 2 : 4;
208
209 for (i = 0; i < ARRAY_SIZE(mw64); i++)
210 if (mw64[i] == opcode)
211 return prf.shorted ? 2 : (prf.enlarged ? 8 : 4);
212
213 printk(KERN_ERR "mmiotrace: Unknown opcode 0x%02x\n", opcode);
214 return 0;
215 }
216
217 /*
218 * Define register ident in mod/rm byte.
219 * Note: these are NOT the same as in ptrace-abi.h.
220 */
221 enum {
222 arg_AL = 0,
223 arg_CL = 1,
224 arg_DL = 2,
225 arg_BL = 3,
226 arg_AH = 4,
227 arg_CH = 5,
228 arg_DH = 6,
229 arg_BH = 7,
230
231 arg_AX = 0,
232 arg_CX = 1,
233 arg_DX = 2,
234 arg_BX = 3,
235 arg_SP = 4,
236 arg_BP = 5,
237 arg_SI = 6,
238 arg_DI = 7,
239 #ifdef __amd64__
240 arg_R8 = 8,
241 arg_R9 = 9,
242 arg_R10 = 10,
243 arg_R11 = 11,
244 arg_R12 = 12,
245 arg_R13 = 13,
246 arg_R14 = 14,
247 arg_R15 = 15
248 #endif
249 };
250
251 static unsigned char *get_reg_w8(int no, int rex, struct pt_regs *regs)
252 {
253 unsigned char *rv = NULL;
254
255 switch (no) {
256 case arg_AL:
257 rv = (unsigned char *)&regs->ax;
258 break;
259 case arg_BL:
260 rv = (unsigned char *)&regs->bx;
261 break;
262 case arg_CL:
263 rv = (unsigned char *)&regs->cx;
264 break;
265 case arg_DL:
266 rv = (unsigned char *)&regs->dx;
267 break;
268 #ifdef __amd64__
269 case arg_R8:
270 rv = (unsigned char *)&regs->r8;
271 break;
272 case arg_R9:
273 rv = (unsigned char *)&regs->r9;
274 break;
275 case arg_R10:
276 rv = (unsigned char *)&regs->r10;
277 break;
278 case arg_R11:
279 rv = (unsigned char *)&regs->r11;
280 break;
281 case arg_R12:
282 rv = (unsigned char *)&regs->r12;
283 break;
284 case arg_R13:
285 rv = (unsigned char *)&regs->r13;
286 break;
287 case arg_R14:
288 rv = (unsigned char *)&regs->r14;
289 break;
290 case arg_R15:
291 rv = (unsigned char *)&regs->r15;
292 break;
293 #endif
294 default:
295 break;
296 }
297
298 if (rv)
299 return rv;
300
301 if (rex) {
302 /*
303 * If REX prefix exists, access low bytes of SI etc.
304 * instead of AH etc.
305 */
306 switch (no) {
307 case arg_SI:
308 rv = (unsigned char *)&regs->si;
309 break;
310 case arg_DI:
311 rv = (unsigned char *)&regs->di;
312 break;
313 case arg_BP:
314 rv = (unsigned char *)&regs->bp;
315 break;
316 case arg_SP:
317 rv = (unsigned char *)&regs->sp;
318 break;
319 default:
320 break;
321 }
322 } else {
323 switch (no) {
324 case arg_AH:
325 rv = 1 + (unsigned char *)&regs->ax;
326 break;
327 case arg_BH:
328 rv = 1 + (unsigned char *)&regs->bx;
329 break;
330 case arg_CH:
331 rv = 1 + (unsigned char *)&regs->cx;
332 break;
333 case arg_DH:
334 rv = 1 + (unsigned char *)&regs->dx;
335 break;
336 default:
337 break;
338 }
339 }
340
341 if (!rv)
342 printk(KERN_ERR "mmiotrace: Error reg no# %d\n", no);
343
344 return rv;
345 }
346
347 static unsigned long *get_reg_w32(int no, struct pt_regs *regs)
348 {
349 unsigned long *rv = NULL;
350
351 switch (no) {
352 case arg_AX:
353 rv = &regs->ax;
354 break;
355 case arg_BX:
356 rv = &regs->bx;
357 break;
358 case arg_CX:
359 rv = &regs->cx;
360 break;
361 case arg_DX:
362 rv = &regs->dx;
363 break;
364 case arg_SP:
365 rv = &regs->sp;
366 break;
367 case arg_BP:
368 rv = &regs->bp;
369 break;
370 case arg_SI:
371 rv = &regs->si;
372 break;
373 case arg_DI:
374 rv = &regs->di;
375 break;
376 #ifdef __amd64__
377 case arg_R8:
378 rv = &regs->r8;
379 break;
380 case arg_R9:
381 rv = &regs->r9;
382 break;
383 case arg_R10:
384 rv = &regs->r10;
385 break;
386 case arg_R11:
387 rv = &regs->r11;
388 break;
389 case arg_R12:
390 rv = &regs->r12;
391 break;
392 case arg_R13:
393 rv = &regs->r13;
394 break;
395 case arg_R14:
396 rv = &regs->r14;
397 break;
398 case arg_R15:
399 rv = &regs->r15;
400 break;
401 #endif
402 default:
403 printk(KERN_ERR "mmiotrace: Error reg no# %d\n", no);
404 }
405
406 return rv;
407 }
408
409 unsigned long get_ins_reg_val(unsigned long ins_addr, struct pt_regs *regs)
410 {
411 unsigned int opcode;
412 int reg;
413 unsigned char *p;
414 struct prefix_bits prf;
415 int i;
416
417 p = (unsigned char *)ins_addr;
418 p += skip_prefix(p, &prf);
419 p += get_opcode(p, &opcode);
420 for (i = 0; i < ARRAY_SIZE(reg_rop); i++)
421 if (reg_rop[i] == opcode)
422 goto do_work;
423
424 for (i = 0; i < ARRAY_SIZE(reg_wop); i++)
425 if (reg_wop[i] == opcode)
426 goto do_work;
427
428 printk(KERN_ERR "mmiotrace: Not a register instruction, opcode "
429 "0x%02x\n", opcode);
430 goto err;
431
432 do_work:
433 /* for STOS, source register is fixed */
434 if (opcode == 0xAA || opcode == 0xAB) {
435 reg = arg_AX;
436 } else {
437 unsigned char mod_rm = *p;
438 reg = ((mod_rm >> 3) & 0x7) | (prf.rexr << 3);
439 }
440 switch (get_ins_reg_width(ins_addr)) {
441 case 1:
442 return *get_reg_w8(reg, prf.rex, regs);
443
444 case 2:
445 return *(unsigned short *)get_reg_w32(reg, regs);
446
447 case 4:
448 return *(unsigned int *)get_reg_w32(reg, regs);
449
450 #ifdef __amd64__
451 case 8:
452 return *(unsigned long *)get_reg_w32(reg, regs);
453 #endif
454
455 default:
456 printk(KERN_ERR "mmiotrace: Error width# %d\n", reg);
457 }
458
459 err:
460 return 0;
461 }
462
463 unsigned long get_ins_imm_val(unsigned long ins_addr)
464 {
465 unsigned int opcode;
466 unsigned char mod_rm;
467 unsigned char mod;
468 unsigned char *p;
469 struct prefix_bits prf;
470 int i;
471
472 p = (unsigned char *)ins_addr;
473 p += skip_prefix(p, &prf);
474 p += get_opcode(p, &opcode);
475 for (i = 0; i < ARRAY_SIZE(imm_wop); i++)
476 if (imm_wop[i] == opcode)
477 goto do_work;
478
479 printk(KERN_ERR "mmiotrace: Not an immediate instruction, opcode "
480 "0x%02x\n", opcode);
481 goto err;
482
483 do_work:
484 mod_rm = *p;
485 mod = mod_rm >> 6;
486 p++;
487 switch (mod) {
488 case 0:
489 /* if r/m is 5 we have a 32 disp (IA32 Manual 3, Table 2-2) */
490 /* AMD64: XXX Check for address size prefix? */
491 if ((mod_rm & 0x7) == 0x5)
492 p += 4;
493 break;
494
495 case 1:
496 p += 1;
497 break;
498
499 case 2:
500 p += 4;
501 break;
502
503 case 3:
504 default:
505 printk(KERN_ERR "mmiotrace: not a memory access instruction "
506 "at 0x%lx, rm_mod=0x%02x\n",
507 ins_addr, mod_rm);
508 }
509
510 switch (get_ins_reg_width(ins_addr)) {
511 case 1:
512 return *(unsigned char *)p;
513
514 case 2:
515 return *(unsigned short *)p;
516
517 case 4:
518 return *(unsigned int *)p;
519
520 #ifdef __amd64__
521 case 8:
522 return *(unsigned long *)p;
523 #endif
524
525 default:
526 printk(KERN_ERR "mmiotrace: Error: width.\n");
527 }
528
529 err:
530 return 0;
531 }
Linux with added FPC-III support