1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  Fault Injection Test harness (FI)
  4 *  Copyright (C) Intel Crop.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  5 */
  6
  7/*  Id: pf_in.c,v 1.1.1.1 2002/11/12 05:56:32 brlock Exp
  8 *  Copyright by Intel Crop., 2002
  9 *  Louis Zhuang (louis.zhuang@intel.com)
 10 *
 11 *  Bjorn Steinbrink (B.Steinbrink@gmx.de), 2007
 12 */
 13
 
 14#include <linux/ptrace.h> /* struct pt_regs */
 15#include "pf_in.h"
 16
 17#ifdef __i386__
 18/* IA32 Manual 3, 2-1 */
 19static unsigned char prefix_codes[] = {
 20	0xF0, 0xF2, 0xF3, 0x2E, 0x36, 0x3E, 0x26, 0x64,
 21	0x65, 0x66, 0x67
 22};
 23/* IA32 Manual 3, 3-432*/
 24static unsigned int reg_rop[] = {
 25	0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
 26};
 27static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
 28static unsigned int imm_wop[] = { 0xC6, 0xC7 };
 29/* IA32 Manual 3, 3-432*/
 30static unsigned int rw8[] = { 0x88, 0x8A, 0xC6, 0xAA };
 31static unsigned int rw32[] = {
 32	0x89, 0x8B, 0xC7, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
 33};
 34static unsigned int mw8[] = { 0x88, 0x8A, 0xC6, 0xB60F, 0xBE0F, 0xAA };
 35static unsigned int mw16[] = { 0xB70F, 0xBF0F };
 36static unsigned int mw32[] = { 0x89, 0x8B, 0xC7, 0xAB };
 37static unsigned int mw64[] = {};
 38#else /* not __i386__ */
 39static unsigned char prefix_codes[] = {
 40	0x66, 0x67, 0x2E, 0x3E, 0x26, 0x64, 0x65, 0x36,
 41	0xF0, 0xF3, 0xF2,
 42	/* REX Prefixes */
 43	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
 44	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
 45};
 46/* AMD64 Manual 3, Appendix A*/
 47static unsigned int reg_rop[] = {
 48	0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
 49};
 50static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
 51static unsigned int imm_wop[] = { 0xC6, 0xC7 };
 52static unsigned int rw8[] = { 0xC6, 0x88, 0x8A, 0xAA };
 53static unsigned int rw32[] = {
 54	0xC7, 0x89, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
 55};
 56/* 8 bit only */
 57static unsigned int mw8[] = { 0xC6, 0x88, 0x8A, 0xB60F, 0xBE0F, 0xAA };
 58/* 16 bit only */
 59static unsigned int mw16[] = { 0xB70F, 0xBF0F };
 60/* 16 or 32 bit */
 61static unsigned int mw32[] = { 0xC7 };
 62/* 16, 32 or 64 bit */
 63static unsigned int mw64[] = { 0x89, 0x8B, 0xAB };
 64#endif /* not __i386__ */
 65
 66struct prefix_bits {
 67	unsigned shorted:1;
 68	unsigned enlarged:1;
 69	unsigned rexr:1;
 70	unsigned rex:1;
 71};
 72
 73static int skip_prefix(unsigned char *addr, struct prefix_bits *prf)
 74{
 75	int i;
 76	unsigned char *p = addr;
 77	prf->shorted = 0;
 78	prf->enlarged = 0;
 79	prf->rexr = 0;
 80	prf->rex = 0;
 81
 82restart:
 83	for (i = 0; i < ARRAY_SIZE(prefix_codes); i++) {
 84		if (*p == prefix_codes[i]) {
 85			if (*p == 0x66)
 86				prf->shorted = 1;
 87#ifdef __amd64__
 88			if ((*p & 0xf8) == 0x48)
 89				prf->enlarged = 1;
 90			if ((*p & 0xf4) == 0x44)
 91				prf->rexr = 1;
 92			if ((*p & 0xf0) == 0x40)
 93				prf->rex = 1;
 94#endif
 95			p++;
 96			goto restart;
 97		}
 98	}
 99
100	return (p - addr);
101}
102
103static int get_opcode(unsigned char *addr, unsigned int *opcode)
104{
105	int len;
106
107	if (*addr == 0x0F) {
108		/* 0x0F is extension instruction */
109		*opcode = *(unsigned short *)addr;
110		len = 2;
111	} else {
112		*opcode = *addr;
113		len = 1;
114	}
115
116	return len;
117}
118
119#define CHECK_OP_TYPE(opcode, array, type) \
120	for (i = 0; i < ARRAY_SIZE(array); i++) { \
121		if (array[i] == opcode) { \
122			rv = type; \
123			goto exit; \
124		} \
125	}
126
127enum reason_type get_ins_type(unsigned long ins_addr)
128{
129	unsigned int opcode;
130	unsigned char *p;
131	struct prefix_bits prf;
132	int i;
133	enum reason_type rv = OTHERS;
134
135	p = (unsigned char *)ins_addr;
136	p += skip_prefix(p, &prf);
137	p += get_opcode(p, &opcode);
138
139	CHECK_OP_TYPE(opcode, reg_rop, REG_READ);
140	CHECK_OP_TYPE(opcode, reg_wop, REG_WRITE);
141	CHECK_OP_TYPE(opcode, imm_wop, IMM_WRITE);
142
143exit:
144	return rv;
145}
146#undef CHECK_OP_TYPE
147
148static unsigned int get_ins_reg_width(unsigned long ins_addr)
149{
150	unsigned int opcode;
151	unsigned char *p;
152	struct prefix_bits prf;
153	int i;
154
155	p = (unsigned char *)ins_addr;
156	p += skip_prefix(p, &prf);
157	p += get_opcode(p, &opcode);
158
159	for (i = 0; i < ARRAY_SIZE(rw8); i++)
160		if (rw8[i] == opcode)
161			return 1;
162
163	for (i = 0; i < ARRAY_SIZE(rw32); i++)
164		if (rw32[i] == opcode)
165			return prf.shorted ? 2 : (prf.enlarged ? 8 : 4);
166
167	printk(KERN_ERR "mmiotrace: Unknown opcode 0x%02x\n", opcode);
168	return 0;
169}
170
171unsigned int get_ins_mem_width(unsigned long ins_addr)
172{
173	unsigned int opcode;
174	unsigned char *p;
175	struct prefix_bits prf;
176	int i;
177
178	p = (unsigned char *)ins_addr;
179	p += skip_prefix(p, &prf);
180	p += get_opcode(p, &opcode);
181
182	for (i = 0; i < ARRAY_SIZE(mw8); i++)
183		if (mw8[i] == opcode)
184			return 1;
185
186	for (i = 0; i < ARRAY_SIZE(mw16); i++)
187		if (mw16[i] == opcode)
188			return 2;
189
190	for (i = 0; i < ARRAY_SIZE(mw32); i++)
191		if (mw32[i] == opcode)
192			return prf.shorted ? 2 : 4;
193
194	for (i = 0; i < ARRAY_SIZE(mw64); i++)
195		if (mw64[i] == opcode)
196			return prf.shorted ? 2 : (prf.enlarged ? 8 : 4);
197
198	printk(KERN_ERR "mmiotrace: Unknown opcode 0x%02x\n", opcode);
199	return 0;
200}
201
202/*
203 * Define register ident in mod/rm byte.
204 * Note: these are NOT the same as in ptrace-abi.h.
205 */
206enum {
207	arg_AL = 0,
208	arg_CL = 1,
209	arg_DL = 2,
210	arg_BL = 3,
211	arg_AH = 4,
212	arg_CH = 5,
213	arg_DH = 6,
214	arg_BH = 7,
215
216	arg_AX = 0,
217	arg_CX = 1,
218	arg_DX = 2,
219	arg_BX = 3,
220	arg_SP = 4,
221	arg_BP = 5,
222	arg_SI = 6,
223	arg_DI = 7,
224#ifdef __amd64__
225	arg_R8  = 8,
226	arg_R9  = 9,
227	arg_R10 = 10,
228	arg_R11 = 11,
229	arg_R12 = 12,
230	arg_R13 = 13,
231	arg_R14 = 14,
232	arg_R15 = 15
233#endif
234};
235
236static unsigned char *get_reg_w8(int no, int rex, struct pt_regs *regs)
237{
238	unsigned char *rv = NULL;
239
240	switch (no) {
241	case arg_AL:
242		rv = (unsigned char *)&regs->ax;
243		break;
244	case arg_BL:
245		rv = (unsigned char *)&regs->bx;
246		break;
247	case arg_CL:
248		rv = (unsigned char *)&regs->cx;
249		break;
250	case arg_DL:
251		rv = (unsigned char *)&regs->dx;
252		break;
253#ifdef __amd64__
254	case arg_R8:
255		rv = (unsigned char *)&regs->r8;
256		break;
257	case arg_R9:
258		rv = (unsigned char *)&regs->r9;
259		break;
260	case arg_R10:
261		rv = (unsigned char *)&regs->r10;
262		break;
263	case arg_R11:
264		rv = (unsigned char *)&regs->r11;
265		break;
266	case arg_R12:
267		rv = (unsigned char *)&regs->r12;
268		break;
269	case arg_R13:
270		rv = (unsigned char *)&regs->r13;
271		break;
272	case arg_R14:
273		rv = (unsigned char *)&regs->r14;
274		break;
275	case arg_R15:
276		rv = (unsigned char *)&regs->r15;
277		break;
278#endif
279	default:
280		break;
281	}
282
283	if (rv)
284		return rv;
285
286	if (rex) {
287		/*
288		 * If REX prefix exists, access low bytes of SI etc.
289		 * instead of AH etc.
290		 */
291		switch (no) {
292		case arg_SI:
293			rv = (unsigned char *)&regs->si;
294			break;
295		case arg_DI:
296			rv = (unsigned char *)&regs->di;
297			break;
298		case arg_BP:
299			rv = (unsigned char *)&regs->bp;
300			break;
301		case arg_SP:
302			rv = (unsigned char *)&regs->sp;
303			break;
304		default:
305			break;
306		}
307	} else {
308		switch (no) {
309		case arg_AH:
310			rv = 1 + (unsigned char *)&regs->ax;
311			break;
312		case arg_BH:
313			rv = 1 + (unsigned char *)&regs->bx;
314			break;
315		case arg_CH:
316			rv = 1 + (unsigned char *)&regs->cx;
317			break;
318		case arg_DH:
319			rv = 1 + (unsigned char *)&regs->dx;
320			break;
321		default:
322			break;
323		}
324	}
325
326	if (!rv)
327		printk(KERN_ERR "mmiotrace: Error reg no# %d\n", no);
328
329	return rv;
330}
331
332static unsigned long *get_reg_w32(int no, struct pt_regs *regs)
333{
334	unsigned long *rv = NULL;
335
336	switch (no) {
337	case arg_AX:
338		rv = &regs->ax;
339		break;
340	case arg_BX:
341		rv = &regs->bx;
342		break;
343	case arg_CX:
344		rv = &regs->cx;
345		break;
346	case arg_DX:
347		rv = &regs->dx;
348		break;
349	case arg_SP:
350		rv = &regs->sp;
351		break;
352	case arg_BP:
353		rv = &regs->bp;
354		break;
355	case arg_SI:
356		rv = &regs->si;
357		break;
358	case arg_DI:
359		rv = &regs->di;
360		break;
361#ifdef __amd64__
362	case arg_R8:
363		rv = &regs->r8;
364		break;
365	case arg_R9:
366		rv = &regs->r9;
367		break;
368	case arg_R10:
369		rv = &regs->r10;
370		break;
371	case arg_R11:
372		rv = &regs->r11;
373		break;
374	case arg_R12:
375		rv = &regs->r12;
376		break;
377	case arg_R13:
378		rv = &regs->r13;
379		break;
380	case arg_R14:
381		rv = &regs->r14;
382		break;
383	case arg_R15:
384		rv = &regs->r15;
385		break;
386#endif
387	default:
388		printk(KERN_ERR "mmiotrace: Error reg no# %d\n", no);
389	}
390
391	return rv;
392}
393
394unsigned long get_ins_reg_val(unsigned long ins_addr, struct pt_regs *regs)
395{
396	unsigned int opcode;
397	int reg;
398	unsigned char *p;
399	struct prefix_bits prf;
400	int i;
401
402	p = (unsigned char *)ins_addr;
403	p += skip_prefix(p, &prf);
404	p += get_opcode(p, &opcode);
405	for (i = 0; i < ARRAY_SIZE(reg_rop); i++)
406		if (reg_rop[i] == opcode)
407			goto do_work;
408
409	for (i = 0; i < ARRAY_SIZE(reg_wop); i++)
410		if (reg_wop[i] == opcode)
411			goto do_work;
412
413	printk(KERN_ERR "mmiotrace: Not a register instruction, opcode "
414							"0x%02x\n", opcode);
415	goto err;
416
417do_work:
418	/* for STOS, source register is fixed */
419	if (opcode == 0xAA || opcode == 0xAB) {
420		reg = arg_AX;
421	} else {
422		unsigned char mod_rm = *p;
423		reg = ((mod_rm >> 3) & 0x7) | (prf.rexr << 3);
424	}
425	switch (get_ins_reg_width(ins_addr)) {
426	case 1:
427		return *get_reg_w8(reg, prf.rex, regs);
428
429	case 2:
430		return *(unsigned short *)get_reg_w32(reg, regs);
431
432	case 4:
433		return *(unsigned int *)get_reg_w32(reg, regs);
434
435#ifdef __amd64__
436	case 8:
437		return *(unsigned long *)get_reg_w32(reg, regs);
438#endif
439
440	default:
441		printk(KERN_ERR "mmiotrace: Error width# %d\n", reg);
442	}
443
444err:
445	return 0;
446}
447
448unsigned long get_ins_imm_val(unsigned long ins_addr)
449{
450	unsigned int opcode;
451	unsigned char mod_rm;
452	unsigned char mod;
453	unsigned char *p;
454	struct prefix_bits prf;
455	int i;
456
457	p = (unsigned char *)ins_addr;
458	p += skip_prefix(p, &prf);
459	p += get_opcode(p, &opcode);
460	for (i = 0; i < ARRAY_SIZE(imm_wop); i++)
461		if (imm_wop[i] == opcode)
462			goto do_work;
463
464	printk(KERN_ERR "mmiotrace: Not an immediate instruction, opcode "
465							"0x%02x\n", opcode);
466	goto err;
467
468do_work:
469	mod_rm = *p;
470	mod = mod_rm >> 6;
471	p++;
472	switch (mod) {
473	case 0:
474		/* if r/m is 5 we have a 32 disp (IA32 Manual 3, Table 2-2)  */
475		/* AMD64: XXX Check for address size prefix? */
476		if ((mod_rm & 0x7) == 0x5)
477			p += 4;
478		break;
479
480	case 1:
481		p += 1;
482		break;
483
484	case 2:
485		p += 4;
486		break;
487
488	case 3:
489	default:
490		printk(KERN_ERR "mmiotrace: not a memory access instruction "
491						"at 0x%lx, rm_mod=0x%02x\n",
492						ins_addr, mod_rm);
493	}
494
495	switch (get_ins_reg_width(ins_addr)) {
496	case 1:
497		return *(unsigned char *)p;
498
499	case 2:
500		return *(unsigned short *)p;
501
502	case 4:
503		return *(unsigned int *)p;
504
505#ifdef __amd64__
506	case 8:
507		return *(unsigned long *)p;
508#endif
509
510	default:
511		printk(KERN_ERR "mmiotrace: Error: width.\n");
512	}
513
514err:
515	return 0;
516}

 
  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 */
 35static unsigned char prefix_codes[] = {
 36	0xF0, 0xF2, 0xF3, 0x2E, 0x36, 0x3E, 0x26, 0x64,
 37	0x65, 0x66, 0x67
 38};
 39/* IA32 Manual 3, 3-432*/
 40static unsigned int reg_rop[] = {
 41	0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
 42};
 43static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
 44static unsigned int imm_wop[] = { 0xC6, 0xC7 };
 45/* IA32 Manual 3, 3-432*/
 46static unsigned int rw8[] = { 0x88, 0x8A, 0xC6, 0xAA };
 47static unsigned int rw32[] = {
 48	0x89, 0x8B, 0xC7, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
 49};
 50static unsigned int mw8[] = { 0x88, 0x8A, 0xC6, 0xB60F, 0xBE0F, 0xAA };
 51static unsigned int mw16[] = { 0xB70F, 0xBF0F };
 52static unsigned int mw32[] = { 0x89, 0x8B, 0xC7, 0xAB };
 53static unsigned int mw64[] = {};
 54#else /* not __i386__ */
 55static 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*/
 63static unsigned int reg_rop[] = {
 64	0x8A, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F
 65};
 66static unsigned int reg_wop[] = { 0x88, 0x89, 0xAA, 0xAB };
 67static unsigned int imm_wop[] = { 0xC6, 0xC7 };
 68static unsigned int rw8[] = { 0xC6, 0x88, 0x8A, 0xAA };
 69static unsigned int rw32[] = {
 70	0xC7, 0x89, 0x8B, 0xB60F, 0xB70F, 0xBE0F, 0xBF0F, 0xAB
 71};
 72/* 8 bit only */
 73static unsigned int mw8[] = { 0xC6, 0x88, 0x8A, 0xB60F, 0xBE0F, 0xAA };
 74/* 16 bit only */
 75static unsigned int mw16[] = { 0xB70F, 0xBF0F };
 76/* 16 or 32 bit */
 77static unsigned int mw32[] = { 0xC7 };
 78/* 16, 32 or 64 bit */
 79static unsigned int mw64[] = { 0x89, 0x8B, 0xAB };
 80#endif /* not __i386__ */
 81
 82struct prefix_bits {
 83	unsigned shorted:1;
 84	unsigned enlarged:1;
 85	unsigned rexr:1;
 86	unsigned rex:1;
 87};
 88
 89static 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
 98restart:
 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
119static 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
143enum 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
159exit:
160	return rv;
161}
162#undef CHECK_OP_TYPE
163
164static 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
187unsigned 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 */
222enum {
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
252static 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
348static 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
410unsigned 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
433do_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
460err:
461	return 0;
462}
463
464unsigned 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
484do_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
530err:
531	return 0;
532}