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Merge branch 'akpm'
[linux-2.6/next.git] / arch / x86 / mm / pf_in.c
blob9f0614daea85fecfd62f7d8e35ebc68aaa3cedad
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/module.h>
30 #include <linux/ptrace.h> /* struct pt_regs */
31 #include "pf_in.h"
32
33 #ifdef __i386__
34 /* IA32 Manual 3, 2-1 */
35 static unsigned char prefix_codes[] = {
36 0xF0, 0xF2, 0xF3, 0x2E, 0x36, 0x3E, 0x26, 0x64,
37 0x65, 0x66, 0x67
38 };
39 /* IA32 Manual 3, 3-432*/
40 static unsigned int reg_rop[] = {
41 0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
42 };
43 static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
44 static unsigned int imm_wop[] = { 0xC6, 0xC7 };
45 /* IA32 Manual 3, 3-432*/
46 static unsigned int rw8[] = { 0x88, 0x8A, 0xC6, 0xAA };
47 static unsigned int rw32[] = {
48 0x89, 0x8B, 0xC7, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
49 };
50 static unsigned int mw8[] = { 0x88, 0x8A, 0xC6, 0xB60F, 0xBE0F, 0xAA };
51 static unsigned int mw16[] = { 0xB70F, 0xBF0F };
52 static unsigned int mw32[] = { 0x89, 0x8B, 0xC7, 0xAB };
53 static unsigned int mw64[] = {};
54 #else /* not __i386__ */
55 static unsigned char prefix_codes[] = {
56 0x66, 0x67, 0x2E, 0x3E, 0x26, 0x64, 0x65, 0x36,
57 0xF0, 0xF3, 0xF2,
58 /* REX Prefixes */
59 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
60 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
61 };
62 /* AMD64 Manual 3, Appendix A*/
63 static unsigned int reg_rop[] = {
64 0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
65 };
66 static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
67 static unsigned int imm_wop[] = { 0xC6, 0xC7 };
68 static unsigned int rw8[] = { 0xC6, 0x88, 0x8A, 0xAA };
69 static unsigned int rw32[] = {
70 0xC7, 0x89, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
71 };
72 /* 8 bit only */
73 static unsigned int mw8[] = { 0xC6, 0x88, 0x8A, 0xB60F, 0xBE0F, 0xAA };
74 /* 16 bit only */
75 static unsigned int mw16[] = { 0xB70F, 0xBF0F };
76 /* 16 or 32 bit */
77 static unsigned int mw32[] = { 0xC7 };
78 /* 16, 32 or 64 bit */
79 static unsigned int mw64[] = { 0x89, 0x8B, 0xAB };
80 #endif /* not __i386__ */
81
82 struct prefix_bits {
83 unsigned shorted:1;
84 unsigned enlarged:1;
85 unsigned rexr:1;
86 unsigned rex:1;
87 };
88
89 static int skip_prefix(unsigned char *addr, struct prefix_bits *prf)
90 {
91 int i;
92 unsigned char *p = addr;
93 prf->shorted = 0;
94 prf->enlarged = 0;
95 prf->rexr = 0;
96 prf->rex = 0;
97
98 restart:
99 for (i = 0; i < ARRAY_SIZE(prefix_codes); i++) {
100 if (*p == prefix_codes[i]) {
101 if (*p == 0x66)
102 prf->shorted = 1;
103 #ifdef __amd64__
104 if ((*p & 0xf8) == 0x48)
105 prf->enlarged = 1;
106 if ((*p & 0xf4) == 0x44)
107 prf->rexr = 1;
108 if ((*p & 0xf0) == 0x40)
109 prf->rex = 1;
110 #endif
111 p++;
112 goto restart;
113 }
114 }
115
116 return (p - addr);
117 }
118
119 static int get_opcode(unsigned char *addr, unsigned int *opcode)
120 {
121 int len;
122
123 if (*addr == 0x0F) {
124 /* 0x0F is extension instruction */
125 *opcode = *(unsigned short *)addr;
126 len = 2;
127 } else {
128 *opcode = *addr;
129 len = 1;
130 }
131
132 return len;
133 }
134
135 #define CHECK_OP_TYPE(opcode, array, type) \
136 for (i = 0; i < ARRAY_SIZE(array); i++) { \
137 if (array[i] == opcode) { \
138 rv = type; \
139 goto exit; \
140 } \
141 }
142
143 enum reason_type get_ins_type(unsigned long ins_addr)
144 {
145 unsigned int opcode;
146 unsigned char *p;
147 struct prefix_bits prf;
148 int i;
149 enum reason_type rv = OTHERS;
150
151 p = (unsigned char *)ins_addr;
152 p += skip_prefix(p, &prf);
153 p += get_opcode(p, &opcode);
154
155 CHECK_OP_TYPE(opcode, reg_rop, REG_READ);
156 CHECK_OP_TYPE(opcode, reg_wop, REG_WRITE);
157 CHECK_OP_TYPE(opcode, imm_wop, IMM_WRITE);
158
159 exit:
160 return rv;
161 }
162 #undef CHECK_OP_TYPE
163
164 static unsigned int get_ins_reg_width(unsigned long ins_addr)
165 {
166 unsigned int opcode;
167 unsigned char *p;
168 struct prefix_bits prf;
169 int i;
170
171 p = (unsigned char *)ins_addr;
172 p += skip_prefix(p, &prf);
173 p += get_opcode(p, &opcode);
174
175 for (i = 0; i < ARRAY_SIZE(rw8); i++)
176 if (rw8[i] == opcode)
177 return 1;
178
179 for (i = 0; i < ARRAY_SIZE(rw32); i++)
180 if (rw32[i] == opcode)
181 return prf.shorted ? 2 : (prf.enlarged ? 8 : 4);
182
183 printk(KERN_ERR "mmiotrace: Unknown opcode 0x%02x\n", opcode);
184 return 0;
185 }
186
187 unsigned int get_ins_mem_width(unsigned long ins_addr)
188 {
189 unsigned int opcode;
190 unsigned char *p;
191 struct prefix_bits prf;
192 int i;
193
194 p = (unsigned char *)ins_addr;
195 p += skip_prefix(p, &prf);
196 p += get_opcode(p, &opcode);
197
198 for (i = 0; i < ARRAY_SIZE(mw8); i++)
199 if (mw8[i] == opcode)
200 return 1;
201
202 for (i = 0; i < ARRAY_SIZE(mw16); i++)
203 if (mw16[i] == opcode)
204 return 2;
205
206 for (i = 0; i < ARRAY_SIZE(mw32); i++)
207 if (mw32[i] == opcode)
208 return prf.shorted ? 2 : 4;
209
210 for (i = 0; i < ARRAY_SIZE(mw64); i++)
211 if (mw64[i] == opcode)
212 return prf.shorted ? 2 : (prf.enlarged ? 8 : 4);
213
214 printk(KERN_ERR "mmiotrace: Unknown opcode 0x%02x\n", opcode);
215 return 0;
216 }
217
218 /*
219 * Define register ident in mod/rm byte.
220 * Note: these are NOT the same as in ptrace-abi.h.
221 */
222 enum {
223 arg_AL = 0,
224 arg_CL = 1,
225 arg_DL = 2,
226 arg_BL = 3,
227 arg_AH = 4,
228 arg_CH = 5,
229 arg_DH = 6,
230 arg_BH = 7,
231
232 arg_AX = 0,
233 arg_CX = 1,
234 arg_DX = 2,
235 arg_BX = 3,
236 arg_SP = 4,
237 arg_BP = 5,
238 arg_SI = 6,
239 arg_DI = 7,
240 #ifdef __amd64__
241 arg_R8 = 8,
242 arg_R9 = 9,
243 arg_R10 = 10,
244 arg_R11 = 11,
245 arg_R12 = 12,
246 arg_R13 = 13,
247 arg_R14 = 14,
248 arg_R15 = 15
249 #endif
250 };
251
252 static unsigned char *get_reg_w8(int no, int rex, struct pt_regs *regs)
253 {
254 unsigned char *rv = NULL;
255
256 switch (no) {
257 case arg_AL:
258 rv = (unsigned char *)&regs->ax;
259 break;
260 case arg_BL:
261 rv = (unsigned char *)&regs->bx;
262 break;
263 case arg_CL:
264 rv = (unsigned char *)&regs->cx;
265 break;
266 case arg_DL:
267 rv = (unsigned char *)&regs->dx;
268 break;
269 #ifdef __amd64__
270 case arg_R8:
271 rv = (unsigned char *)&regs->r8;
272 break;
273 case arg_R9:
274 rv = (unsigned char *)&regs->r9;
275 break;
276 case arg_R10:
277 rv = (unsigned char *)&regs->r10;
278 break;
279 case arg_R11:
280 rv = (unsigned char *)&regs->r11;
281 break;
282 case arg_R12:
283 rv = (unsigned char *)&regs->r12;
284 break;
285 case arg_R13:
286 rv = (unsigned char *)&regs->r13;
287 break;
288 case arg_R14:
289 rv = (unsigned char *)&regs->r14;
290 break;
291 case arg_R15:
292 rv = (unsigned char *)&regs->r15;
293 break;
294 #endif
295 default:
296 break;
297 }
298
299 if (rv)
300 return rv;
301
302 if (rex) {
303 /*
304 * If REX prefix exists, access low bytes of SI etc.
305 * instead of AH etc.
306 */
307 switch (no) {
308 case arg_SI:
309 rv = (unsigned char *)&regs->si;
310 break;
311 case arg_DI:
312 rv = (unsigned char *)&regs->di;
313 break;
314 case arg_BP:
315 rv = (unsigned char *)&regs->bp;
316 break;
317 case arg_SP:
318 rv = (unsigned char *)&regs->sp;
319 break;
320 default:
321 break;
322 }
323 } else {
324 switch (no) {
325 case arg_AH:
326 rv = 1 + (unsigned char *)&regs->ax;
327 break;
328 case arg_BH:
329 rv = 1 + (unsigned char *)&regs->bx;
330 break;
331 case arg_CH:
332 rv = 1 + (unsigned char *)&regs->cx;
333 break;
334 case arg_DH:
335 rv = 1 + (unsigned char *)&regs->dx;
336 break;
337 default:
338 break;
339 }
340 }
341
342 if (!rv)
343 printk(KERN_ERR "mmiotrace: Error reg no# %d\n", no);
344
345 return rv;
346 }
347
348 static unsigned long *get_reg_w32(int no, struct pt_regs *regs)
349 {
350 unsigned long *rv = NULL;
351
352 switch (no) {
353 case arg_AX:
354 rv = &regs->ax;
355 break;
356 case arg_BX:
357 rv = &regs->bx;
358 break;
359 case arg_CX:
360 rv = &regs->cx;
361 break;
362 case arg_DX:
363 rv = &regs->dx;
364 break;
365 case arg_SP:
366 rv = &regs->sp;
367 break;
368 case arg_BP:
369 rv = &regs->bp;
370 break;
371 case arg_SI:
372 rv = &regs->si;
373 break;
374 case arg_DI:
375 rv = &regs->di;
376 break;
377 #ifdef __amd64__
378 case arg_R8:
379 rv = &regs->r8;
380 break;
381 case arg_R9:
382 rv = &regs->r9;
383 break;
384 case arg_R10:
385 rv = &regs->r10;
386 break;
387 case arg_R11:
388 rv = &regs->r11;
389 break;
390 case arg_R12:
391 rv = &regs->r12;
392 break;
393 case arg_R13:
394 rv = &regs->r13;
395 break;
396 case arg_R14:
397 rv = &regs->r14;
398 break;
399 case arg_R15:
400 rv = &regs->r15;
401 break;
402 #endif
403 default:
404 printk(KERN_ERR "mmiotrace: Error reg no# %d\n", no);
405 }
406
407 return rv;
408 }
409
410 unsigned long get_ins_reg_val(unsigned long ins_addr, struct pt_regs *regs)
411 {
412 unsigned int opcode;
413 int reg;
414 unsigned char *p;
415 struct prefix_bits prf;
416 int i;
417
418 p = (unsigned char *)ins_addr;
419 p += skip_prefix(p, &prf);
420 p += get_opcode(p, &opcode);
421 for (i = 0; i < ARRAY_SIZE(reg_rop); i++)
422 if (reg_rop[i] == opcode)
423 goto do_work;
424
425 for (i = 0; i < ARRAY_SIZE(reg_wop); i++)
426 if (reg_wop[i] == opcode)
427 goto do_work;
428
429 printk(KERN_ERR "mmiotrace: Not a register instruction, opcode "
430 "0x%02x\n", opcode);
431 goto err;
432
433 do_work:
434 /* for STOS, source register is fixed */
435 if (opcode == 0xAA || opcode == 0xAB) {
436 reg = arg_AX;
437 } else {
438 unsigned char mod_rm = *p;
439 reg = ((mod_rm >> 3) & 0x7) | (prf.rexr << 3);
440 }
441 switch (get_ins_reg_width(ins_addr)) {
442 case 1:
443 return *get_reg_w8(reg, prf.rex, regs);
444
445 case 2:
446 return *(unsigned short *)get_reg_w32(reg, regs);
447
448 case 4:
449 return *(unsigned int *)get_reg_w32(reg, regs);
450
451 #ifdef __amd64__
452 case 8:
453 return *(unsigned long *)get_reg_w32(reg, regs);
454 #endif
455
456 default:
457 printk(KERN_ERR "mmiotrace: Error width# %d\n", reg);
458 }
459
460 err:
461 return 0;
462 }
463
464 unsigned long get_ins_imm_val(unsigned long ins_addr)
465 {
466 unsigned int opcode;
467 unsigned char mod_rm;
468 unsigned char mod;
469 unsigned char *p;
470 struct prefix_bits prf;
471 int i;
472
473 p = (unsigned char *)ins_addr;
474 p += skip_prefix(p, &prf);
475 p += get_opcode(p, &opcode);
476 for (i = 0; i < ARRAY_SIZE(imm_wop); i++)
477 if (imm_wop[i] == opcode)
478 goto do_work;
479
480 printk(KERN_ERR "mmiotrace: Not an immediate instruction, opcode "
481 "0x%02x\n", opcode);
482 goto err;
483
484 do_work:
485 mod_rm = *p;
486 mod = mod_rm >> 6;
487 p++;
488 switch (mod) {
489 case 0:
490 /* if r/m is 5 we have a 32 disp (IA32 Manual 3, Table 2-2) */
491 /* AMD64: XXX Check for address size prefix? */
492 if ((mod_rm & 0x7) == 0x5)
493 p += 4;
494 break;
495
496 case 1:
497 p += 1;
498 break;
499
500 case 2:
501 p += 4;
502 break;
503
504 case 3:
505 default:
506 printk(KERN_ERR "mmiotrace: not a memory access instruction "
507 "at 0x%lx, rm_mod=0x%02x\n",
508 ins_addr, mod_rm);
509 }
510
511 switch (get_ins_reg_width(ins_addr)) {
512 case 1:
513 return *(unsigned char *)p;
514
515 case 2:
516 return *(unsigned short *)p;
517
518 case 4:
519 return *(unsigned int *)p;
520
521 #ifdef __amd64__
522 case 8:
523 return *(unsigned long *)p;
524 #endif
525
526 default:
527 printk(KERN_ERR "mmiotrace: Error: width.\n");
528 }
529
530 err:
531 return 0;
532 }
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