aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/kernel/kprobes-test.h
blob: 4430990e90e7aaf309d67dbad363490aced5a413 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
/*
 * arch/arm/kernel/kprobes-test.h
 *
 * Copyright (C) 2011 Jon Medhurst <tixy@yxit.co.uk>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define VERBOSE 0 /* Set to '1' for more logging of test cases */

#ifdef CONFIG_THUMB2_KERNEL
#define NORMAL_ISA "16"
#else
#define NORMAL_ISA "32"
#endif


/* Flags used in kprobe_test_flags */
#define TEST_FLAG_NO_ITBLOCK	(1<<0)
#define TEST_FLAG_FULL_ITBLOCK	(1<<1)
#define TEST_FLAG_NARROW_INSTR	(1<<2)

extern int kprobe_test_flags;
extern int kprobe_test_cc_position;


#define TEST_MEMORY_SIZE 256


/*
 * Test case structures.
 *
 * The arguments given to test cases can be one of three types.
 *
 *   ARG_TYPE_REG
 *	Load a register with the given value.
 *
 *   ARG_TYPE_PTR
 *	Load a register with a pointer into the stack buffer (SP + given value).
 *
 *   ARG_TYPE_MEM
 *	Store the given value into the stack buffer at [SP+index].
 *
 */

#define	ARG_TYPE_END	0
#define	ARG_TYPE_REG	1
#define	ARG_TYPE_PTR	2
#define	ARG_TYPE_MEM	3

#define ARG_FLAG_UNSUPPORTED	0x01
#define ARG_FLAG_SUPPORTED	0x02
#define ARG_FLAG_THUMB		0x10	/* Must be 16 so TEST_ISA can be used */
#define ARG_FLAG_ARM		0x20	/* Must be 32 so TEST_ISA can be used */

struct test_arg {
	u8	type;		/* ARG_TYPE_x */
	u8	_padding[7];
};

struct test_arg_regptr {
	u8	type;		/* ARG_TYPE_REG or ARG_TYPE_PTR */
	u8	reg;
	u8	_padding[2];
	u32	val;
};

struct test_arg_mem {
	u8	type;		/* ARG_TYPE_MEM */
	u8	index;
	u8	_padding[2];
	u32	val;
};

struct test_arg_end {
	u8	type;		/* ARG_TYPE_END */
	u8	flags;		/* ARG_FLAG_x */
	u16	code_offset;
	u16	branch_offset;
	u16	end_offset;
};


/*
 * Building blocks for test cases.
 *
 * Each test case is wrapped between TESTCASE_START and TESTCASE_END.
 *
 * To specify arguments for a test case the TEST_ARG_{REG,PTR,MEM} macros are
 * used followed by a terminating TEST_ARG_END.
 *
 * After this, the instruction to be tested is defined with TEST_INSTRUCTION.
 * Or for branches, TEST_BRANCH_B and TEST_BRANCH_F (branch forwards/backwards).
 *
 * Some specific test cases may make use of other custom constructs.
 */

#if VERBOSE
#define verbose(fmt, ...) pr_info(fmt, ##__VA_ARGS__)
#else
#define verbose(fmt, ...)
#endif

#define TEST_GROUP(title)					\
	verbose("\n");						\
	verbose(title"\n");					\
	verbose("---------------------------------------------------------\n");

#define TESTCASE_START(title)					\
	__asm__ __volatile__ (					\
	"bl	__kprobes_test_case_start		\n\t"	\
	".pushsection .rodata				\n\t"	\
	"10:						\n\t"	\
	/* don't use .asciz here as 'title' may be */		\
	/* multiple strings to be concatenated.  */		\
	".ascii "#title"				\n\t"	\
	".byte	0					\n\t"	\
	".popsection					\n\t"	\
	".word	10b					\n\t"

#define	TEST_ARG_REG(reg, val)					\
	".byte	"__stringify(ARG_TYPE_REG)"		\n\t"	\
	".byte	"#reg"					\n\t"	\
	".short	0					\n\t"	\
	".word	"#val"					\n\t"

#define	TEST_ARG_PTR(reg, val)					\
	".byte	"__stringify(ARG_TYPE_PTR)"		\n\t"	\
	".byte	"#reg"					\n\t"	\
	".short	0					\n\t"	\
	".word	"#val"					\n\t"

#define	TEST_ARG_MEM(index, val)				\
	".byte	"__stringify(ARG_TYPE_MEM)"		\n\t"	\
	".byte	"#index"				\n\t"	\
	".short	0					\n\t"	\
	".word	"#val"					\n\t"

#define	TEST_ARG_END(flags)					\
	".byte	"__stringify(ARG_TYPE_END)"		\n\t"	\
	".byte	"TEST_ISA flags"			\n\t"	\
	".short	50f-0f					\n\t"	\
	".short	2f-0f					\n\t"	\
	".short	99f-0f					\n\t"	\
	".code "TEST_ISA"				\n\t"	\
	"0:						\n\t"

#define TEST_INSTRUCTION(instruction)				\
	"50:	nop					\n\t"	\
	"1:	"instruction"				\n\t"	\
	"	nop					\n\t"

#define TEST_BRANCH_F(instruction)				\
	TEST_INSTRUCTION(instruction)				\
	"	b	99f				\n\t"	\
	"2:	nop					\n\t"

#define TEST_BRANCH_B(instruction)				\
	"	b	50f				\n\t"	\
	"	b	99f				\n\t"	\
	"2:	nop					\n\t"	\
	"	b	99f				\n\t"	\
	TEST_INSTRUCTION(instruction)

#define TEST_BRANCH_FX(instruction, codex)			\
	TEST_INSTRUCTION(instruction)				\
	"	b	99f				\n\t"	\
	codex"						\n\t"	\
	"	b	99f				\n\t"	\
	"2:	nop					\n\t"

#define TEST_BRANCH_BX(instruction, codex)			\
	"	b	50f				\n\t"	\
	"	b	99f				\n\t"	\
	"2:	nop					\n\t"	\
	"	b	99f				\n\t"	\
	codex"						\n\t"	\
	TEST_INSTRUCTION(instruction)

#define TESTCASE_END						\
	"2:						\n\t"	\
	"99:						\n\t"	\
	"	bl __kprobes_test_case_end_"TEST_ISA"	\n\t"	\
	".code "NORMAL_ISA"				\n\t"	\
	: :							\
	: "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc"	\
	);


/*
 * Macros to define test cases.
 *
 * Those of the form TEST_{R,P,M}* can be used to define test cases
 * which take combinations of the three basic types of arguments. E.g.
 *
 *   TEST_R	One register argument
 *   TEST_RR	Two register arguments
 *   TEST_RPR	A register, a pointer, then a register argument
 *
 * For testing instructions which may branch, there are macros TEST_BF_*
 * and TEST_BB_* for branching forwards and backwards.
 *
 * TEST_SUPPORTED and TEST_UNSUPPORTED don't cause the code to be executed,
 * the just verify that a kprobe is or is not allowed on the given instruction.
 */

#define TEST(code)				\
	TESTCASE_START(code)			\
	TEST_ARG_END("")			\
	TEST_INSTRUCTION(code)			\
	TESTCASE_END

#define TEST_UNSUPPORTED(code)					\
	TESTCASE_START(code)					\
	TEST_ARG_END("|"__stringify(ARG_FLAG_UNSUPPORTED))	\
	TEST_INSTRUCTION(code)					\
	TESTCASE_END

#define TEST_SUPPORTED(code)					\
	TESTCASE_START(code)					\
	TEST_ARG_END("|"__stringify(ARG_FLAG_SUPPORTED))	\
	TEST_INSTRUCTION(code)					\
	TESTCASE_END

#define TEST_R(code1, reg, val, code2)			\
	TESTCASE_START(code1 #reg code2)		\
	TEST_ARG_REG(reg, val)				\
	TEST_ARG_END("")				\
	TEST_INSTRUCTION(code1 #reg code2)		\
	TESTCASE_END

#define TEST_RR(code1, reg1, val1, code2, reg2, val2, code3)	\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3)		\
	TEST_ARG_REG(reg1, val1)				\
	TEST_ARG_REG(reg2, val2)				\
	TEST_ARG_END("")					\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3)		\
	TESTCASE_END

#define TEST_RRR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TEST_ARG_REG(reg1, val1)						\
	TEST_ARG_REG(reg2, val2)						\
	TEST_ARG_REG(reg3, val3)						\
	TEST_ARG_END("")							\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TESTCASE_END

#define TEST_RRRR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4, reg4, val4)	\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4 #reg4)		\
	TEST_ARG_REG(reg1, val1)						\
	TEST_ARG_REG(reg2, val2)						\
	TEST_ARG_REG(reg3, val3)						\
	TEST_ARG_REG(reg4, val4)						\
	TEST_ARG_END("")							\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4 #reg4)	\
	TESTCASE_END

#define TEST_P(code1, reg1, val1, code2)	\
	TESTCASE_START(code1 #reg1 code2)	\
	TEST_ARG_PTR(reg1, val1)		\
	TEST_ARG_END("")			\
	TEST_INSTRUCTION(code1 #reg1 code2)	\
	TESTCASE_END

#define TEST_PR(code1, reg1, val1, code2, reg2, val2, code3)	\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3)		\
	TEST_ARG_PTR(reg1, val1)				\
	TEST_ARG_REG(reg2, val2)				\
	TEST_ARG_END("")					\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3)		\
	TESTCASE_END

#define TEST_RP(code1, reg1, val1, code2, reg2, val2, code3)	\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3)		\
	TEST_ARG_REG(reg1, val1)				\
	TEST_ARG_PTR(reg2, val2)				\
	TEST_ARG_END("")					\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3)		\
	TESTCASE_END

#define TEST_PRR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TEST_ARG_PTR(reg1, val1)						\
	TEST_ARG_REG(reg2, val2)						\
	TEST_ARG_REG(reg3, val3)						\
	TEST_ARG_END("")							\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TESTCASE_END

#define TEST_RPR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TEST_ARG_REG(reg1, val1)						\
	TEST_ARG_PTR(reg2, val2)						\
	TEST_ARG_REG(reg3, val3)						\
	TEST_ARG_END("")							\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TESTCASE_END

#define TEST_RRP(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TEST_ARG_REG(reg1, val1)						\
	TEST_ARG_REG(reg2, val2)						\
	TEST_ARG_PTR(reg3, val3)						\
	TEST_ARG_END("")							\
	TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4)		\
	TESTCASE_END

#define TEST_BF_P(code1, reg1, val1, code2)	\
	TESTCASE_START(code1 #reg1 code2)	\
	TEST_ARG_PTR(reg1, val1)		\
	TEST_ARG_END("")			\
	TEST_BRANCH_F(code1 #reg1 code2)	\
	TESTCASE_END

#define TEST_BF(code)				\
	TESTCASE_START(code)			\
	TEST_ARG_END("")			\
	TEST_BRANCH_F(code)			\
	TESTCASE_END

#define TEST_BB(code)				\
	TESTCASE_START(code)			\
	TEST_ARG_END("")			\
	TEST_BRANCH_B(code)			\
	TESTCASE_END

#define TEST_BF_R(code1, reg, val, code2)	\
	TESTCASE_START(code1 #reg code2)	\
	TEST_ARG_REG(reg, val)			\
	TEST_ARG_END("")			\
	TEST_BRANCH_F(code1 #reg code2)		\
	TESTCASE_END

#define TEST_BB_R(code1, reg, val, code2)	\
	TESTCASE_START(code1 #reg code2)	\
	TEST_ARG_REG(reg, val)			\
	TEST_ARG_END("")			\
	TEST_BRANCH_B(code1 #reg code2)		\
	TESTCASE_END

#define TEST_BF_RR(code1, reg1, val1, code2, reg2, val2, code3)	\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3)		\
	TEST_ARG_REG(reg1, val1)				\
	TEST_ARG_REG(reg2, val2)				\
	TEST_ARG_END("")					\
	TEST_BRANCH_F(code1 #reg1 code2 #reg2 code3)		\
	TESTCASE_END

#define TEST_BF_X(code, codex)			\
	TESTCASE_START(code)			\
	TEST_ARG_END("")			\
	TEST_BRANCH_FX(code, codex)		\
	TESTCASE_END

#define TEST_BB_X(code, codex)			\
	TESTCASE_START(code)			\
	TEST_ARG_END("")			\
	TEST_BRANCH_BX(code, codex)		\
	TESTCASE_END

#define TEST_BF_RX(code1, reg, val, code2, codex)	\
	TESTCASE_START(code1 #reg code2)		\
	TEST_ARG_REG(reg, val)				\
	TEST_ARG_END("")				\
	TEST_BRANCH_FX(code1 #reg code2, codex)		\
	TESTCASE_END

#define TEST_X(code, codex)			\
	TESTCASE_START(code)			\
	TEST_ARG_END("")			\
	TEST_INSTRUCTION(code)			\
	"	b	99f		\n\t"	\
	"	"codex"			\n\t"	\
	TESTCASE_END

#define TEST_RX(code1, reg, val, code2, codex)		\
	TESTCASE_START(code1 #reg code2)		\
	TEST_ARG_REG(reg, val)				\
	TEST_ARG_END("")				\
	TEST_INSTRUCTION(code1 __stringify(reg) code2)	\
	"	b	99f		\n\t"		\
	"	"codex"			\n\t"		\
	TESTCASE_END

#define TEST_RRX(code1, reg1, val1, code2, reg2, val2, code3, codex)		\
	TESTCASE_START(code1 #reg1 code2 #reg2 code3)				\
	TEST_ARG_REG(reg1, val1)						\
	TEST_ARG_REG(reg2, val2)						\
	TEST_ARG_END("")							\
	TEST_INSTRUCTION(code1 __stringify(reg1) code2 __stringify(reg2) code3)	\
	"	b	99f		\n\t"					\
	"	"codex"			\n\t"					\
	TESTCASE_END


/*
 * Macros for defining space directives spread over multiple lines.
 * These are required so the compiler guesses better the length of inline asm
 * code and will spill the literal pool early enough to avoid generating PC
 * relative loads with out of range offsets.
 */
#define TWICE(x)	x x
#define SPACE_0x8	TWICE(".space 4\n\t")
#define SPACE_0x10	TWICE(SPACE_0x8)
#define SPACE_0x20	TWICE(SPACE_0x10)
#define SPACE_0x40	TWICE(SPACE_0x20)
#define SPACE_0x80	TWICE(SPACE_0x40)
#define SPACE_0x100	TWICE(SPACE_0x80)
#define SPACE_0x200	TWICE(SPACE_0x100)
#define SPACE_0x400	TWICE(SPACE_0x200)
#define SPACE_0x800	TWICE(SPACE_0x400)
#define SPACE_0x1000	TWICE(SPACE_0x800)


/* Various values used in test cases... */
#define N(val)	(val ^ 0xffffffff)
#define VAL1	0x12345678
#define VAL2	N(VAL1)
#define VAL3	0xa5f801
#define VAL4	N(VAL3)
#define VALM	0x456789ab
#define VALR	0xdeaddead
#define HH1	0x0123fecb
#define HH2	0xa9874567


#ifdef CONFIG_THUMB2_KERNEL
void kprobe_thumb16_test_cases(void);
void kprobe_thumb32_test_cases(void);
#else
void kprobe_arm_test_cases(void);
#endif