summaryrefslogtreecommitdiffstats
path: root/tools/lib/bpf/bpf_tracing.h
blob: 1c2e91ee041d8db7103e623579ff6f1c67fbe8ca (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
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
#ifndef __BPF_TRACING_H__
#define __BPF_TRACING_H__

/* Scan the ARCH passed in from ARCH env variable (see Makefile) */
#if defined(__TARGET_ARCH_x86)
	#define bpf_target_x86
	#define bpf_target_defined
#elif defined(__TARGET_ARCH_s390)
	#define bpf_target_s390
	#define bpf_target_defined
#elif defined(__TARGET_ARCH_arm)
	#define bpf_target_arm
	#define bpf_target_defined
#elif defined(__TARGET_ARCH_arm64)
	#define bpf_target_arm64
	#define bpf_target_defined
#elif defined(__TARGET_ARCH_mips)
	#define bpf_target_mips
	#define bpf_target_defined
#elif defined(__TARGET_ARCH_powerpc)
	#define bpf_target_powerpc
	#define bpf_target_defined
#elif defined(__TARGET_ARCH_sparc)
	#define bpf_target_sparc
	#define bpf_target_defined
#else
	#undef bpf_target_defined
#endif

/* Fall back to what the compiler says */
#ifndef bpf_target_defined
#if defined(__x86_64__)
	#define bpf_target_x86
#elif defined(__s390__)
	#define bpf_target_s390
#elif defined(__arm__)
	#define bpf_target_arm
#elif defined(__aarch64__)
	#define bpf_target_arm64
#elif defined(__mips__)
	#define bpf_target_mips
#elif defined(__powerpc__)
	#define bpf_target_powerpc
#elif defined(__sparc__)
	#define bpf_target_sparc
#endif
#endif

#if defined(bpf_target_x86)

#if defined(__KERNEL__) || defined(__VMLINUX_H__)

#define PT_REGS_PARM1(x) ((x)->di)
#define PT_REGS_PARM2(x) ((x)->si)
#define PT_REGS_PARM3(x) ((x)->dx)
#define PT_REGS_PARM4(x) ((x)->cx)
#define PT_REGS_PARM5(x) ((x)->r8)
#define PT_REGS_RET(x) ((x)->sp)
#define PT_REGS_FP(x) ((x)->bp)
#define PT_REGS_RC(x) ((x)->ax)
#define PT_REGS_SP(x) ((x)->sp)
#define PT_REGS_IP(x) ((x)->ip)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), di)
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), si)
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), dx)
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), cx)
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8)
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), sp)
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), bp)
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), ax)
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), ip)

#else

#ifdef __i386__
/* i386 kernel is built with -mregparm=3 */
#define PT_REGS_PARM1(x) ((x)->eax)
#define PT_REGS_PARM2(x) ((x)->edx)
#define PT_REGS_PARM3(x) ((x)->ecx)
#define PT_REGS_PARM4(x) 0
#define PT_REGS_PARM5(x) 0
#define PT_REGS_RET(x) ((x)->esp)
#define PT_REGS_FP(x) ((x)->ebp)
#define PT_REGS_RC(x) ((x)->eax)
#define PT_REGS_SP(x) ((x)->esp)
#define PT_REGS_IP(x) ((x)->eip)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), eax)
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), edx)
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), ecx)
#define PT_REGS_PARM4_CORE(x) 0
#define PT_REGS_PARM5_CORE(x) 0
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), esp)
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), ebp)
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), eax)
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), esp)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), eip)

#else

#define PT_REGS_PARM1(x) ((x)->rdi)
#define PT_REGS_PARM2(x) ((x)->rsi)
#define PT_REGS_PARM3(x) ((x)->rdx)
#define PT_REGS_PARM4(x) ((x)->rcx)
#define PT_REGS_PARM5(x) ((x)->r8)
#define PT_REGS_RET(x) ((x)->rsp)
#define PT_REGS_FP(x) ((x)->rbp)
#define PT_REGS_RC(x) ((x)->rax)
#define PT_REGS_SP(x) ((x)->rsp)
#define PT_REGS_IP(x) ((x)->rip)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), rdi)
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), rsi)
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), rdx)
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), rcx)
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8)
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), rsp)
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), rbp)
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), rax)
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), rsp)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), rip)

#endif
#endif

#elif defined(bpf_target_s390)

/* s390 provides user_pt_regs instead of struct pt_regs to userspace */
struct pt_regs;
#define PT_REGS_S390 const volatile user_pt_regs
#define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2])
#define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3])
#define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4])
#define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5])
#define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6])
#define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14])
/* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11])
#define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2])
#define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15])
#define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2])
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[3])
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[4])
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[5])
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[6])
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[14])
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[11])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[15])
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), psw.addr)

#elif defined(bpf_target_arm)

#define PT_REGS_PARM1(x) ((x)->uregs[0])
#define PT_REGS_PARM2(x) ((x)->uregs[1])
#define PT_REGS_PARM3(x) ((x)->uregs[2])
#define PT_REGS_PARM4(x) ((x)->uregs[3])
#define PT_REGS_PARM5(x) ((x)->uregs[4])
#define PT_REGS_RET(x) ((x)->uregs[14])
#define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_RC(x) ((x)->uregs[0])
#define PT_REGS_SP(x) ((x)->uregs[13])
#define PT_REGS_IP(x) ((x)->uregs[12])

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), uregs[0])
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), uregs[1])
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), uregs[2])
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), uregs[3])
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), uregs[4])
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), uregs[14])
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), uregs[11])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), uregs[0])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), uregs[13])
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), uregs[12])

#elif defined(bpf_target_arm64)

/* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */
struct pt_regs;
#define PT_REGS_ARM64 const volatile struct user_pt_regs
#define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0])
#define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1])
#define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2])
#define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3])
#define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4])
#define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30])
/* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29])
#define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0])
#define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp)
#define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0])
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[1])
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[2])
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[3])
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[4])
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[30])
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[29])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), sp)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), pc)

#elif defined(bpf_target_mips)

#define PT_REGS_PARM1(x) ((x)->regs[4])
#define PT_REGS_PARM2(x) ((x)->regs[5])
#define PT_REGS_PARM3(x) ((x)->regs[6])
#define PT_REGS_PARM4(x) ((x)->regs[7])
#define PT_REGS_PARM5(x) ((x)->regs[8])
#define PT_REGS_RET(x) ((x)->regs[31])
#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
#define PT_REGS_RC(x) ((x)->regs[2])
#define PT_REGS_SP(x) ((x)->regs[29])
#define PT_REGS_IP(x) ((x)->cp0_epc)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), regs[4])
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), regs[5])
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), regs[6])
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), regs[7])
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8])
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31])
#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[2])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29])
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc)

#elif defined(bpf_target_powerpc)

#define PT_REGS_PARM1(x) ((x)->gpr[3])
#define PT_REGS_PARM2(x) ((x)->gpr[4])
#define PT_REGS_PARM3(x) ((x)->gpr[5])
#define PT_REGS_PARM4(x) ((x)->gpr[6])
#define PT_REGS_PARM5(x) ((x)->gpr[7])
#define PT_REGS_RC(x) ((x)->gpr[3])
#define PT_REGS_SP(x) ((x)->sp)
#define PT_REGS_IP(x) ((x)->nip)

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), gpr[3])
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), gpr[4])
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), gpr[5])
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), gpr[6])
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), gpr[7])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), gpr[3])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), nip)

#elif defined(bpf_target_sparc)

#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])

#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0])
#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I1])
#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I2])
#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I3])
#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I4])
#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I7])
#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0])
#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), u_regs[UREG_FP])

/* Should this also be a bpf_target check for the sparc case? */
#if defined(__arch64__)
#define PT_REGS_IP(x) ((x)->tpc)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), tpc)
#else
#define PT_REGS_IP(x) ((x)->pc)
#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), pc)
#endif

#endif

#if defined(bpf_target_powerpc)
#define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = (ctx)->link; })
#define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
#elif defined(bpf_target_sparc)
#define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = PT_REGS_RET(ctx); })
#define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
#else
#define BPF_KPROBE_READ_RET_IP(ip, ctx)					    \
	({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
#define BPF_KRETPROBE_READ_RET_IP(ip, ctx)				    \
	({ bpf_probe_read_kernel(&(ip), sizeof(ip),			    \
			  (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
#endif

#define ___bpf_concat(a, b) a ## b
#define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
#define ___bpf_narg(...) \
	___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#define ___bpf_empty(...) \
	___bpf_nth(_, ##__VA_ARGS__, N, N, N, N, N, N, N, N, N, N, 0)

#define ___bpf_ctx_cast0() ctx
#define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0]
#define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1]
#define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2]
#define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3]
#define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4]
#define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5]
#define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6]
#define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7]
#define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8]
#define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9]
#define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10]
#define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11]
#define ___bpf_ctx_cast(args...) \
	___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args)

/*
 * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and
 * similar kinds of BPF programs, that accept input arguments as a single
 * pointer to untyped u64 array, where each u64 can actually be a typed
 * pointer or integer of different size. Instead of requring user to write
 * manual casts and work with array elements by index, BPF_PROG macro
 * allows user to declare a list of named and typed input arguments in the
 * same syntax as for normal C function. All the casting is hidden and
 * performed transparently, while user code can just assume working with
 * function arguments of specified type and name.
 *
 * Original raw context argument is preserved as well as 'ctx' argument.
 * This is useful when using BPF helpers that expect original context
 * as one of the parameters (e.g., for bpf_perf_event_output()).
 */
#define BPF_PROG(name, args...)						    \
name(unsigned long long *ctx);						    \
static __attribute__((always_inline)) typeof(name(0))			    \
____##name(unsigned long long *ctx, ##args);				    \
typeof(name(0)) name(unsigned long long *ctx)				    \
{									    \
	_Pragma("GCC diagnostic push")					    \
	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")		    \
	return ____##name(___bpf_ctx_cast(args));			    \
	_Pragma("GCC diagnostic pop")					    \
}									    \
static __attribute__((always_inline)) typeof(name(0))			    \
____##name(unsigned long long *ctx, ##args)

struct pt_regs;

#define ___bpf_kprobe_args0() ctx
#define ___bpf_kprobe_args1(x) \
	___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx)
#define ___bpf_kprobe_args2(x, args...) \
	___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx)
#define ___bpf_kprobe_args3(x, args...) \
	___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx)
#define ___bpf_kprobe_args4(x, args...) \
	___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx)
#define ___bpf_kprobe_args5(x, args...) \
	___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx)
#define ___bpf_kprobe_args(args...) \
	___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args)

/*
 * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for
 * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific
 * low-level way of getting kprobe input arguments from struct pt_regs, and
 * provides a familiar typed and named function arguments syntax and
 * semantics of accessing kprobe input paremeters.
 *
 * Original struct pt_regs* context is preserved as 'ctx' argument. This might
 * be necessary when using BPF helpers like bpf_perf_event_output().
 */
#define BPF_KPROBE(name, args...)					    \
name(struct pt_regs *ctx);						    \
static __attribute__((always_inline)) typeof(name(0))			    \
____##name(struct pt_regs *ctx, ##args);				    \
typeof(name(0)) name(struct pt_regs *ctx)				    \
{									    \
	_Pragma("GCC diagnostic push")					    \
	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")		    \
	return ____##name(___bpf_kprobe_args(args));			    \
	_Pragma("GCC diagnostic pop")					    \
}									    \
static __attribute__((always_inline)) typeof(name(0))			    \
____##name(struct pt_regs *ctx, ##args)

#define ___bpf_kretprobe_args0() ctx
#define ___bpf_kretprobe_args1(x) \
	___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx)
#define ___bpf_kretprobe_args(args...) \
	___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args)

/*
 * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional
 * return value (in addition to `struct pt_regs *ctx`), but no input
 * arguments, because they will be clobbered by the time probed function
 * returns.
 */
#define BPF_KRETPROBE(name, args...)					    \
name(struct pt_regs *ctx);						    \
static __attribute__((always_inline)) typeof(name(0))			    \
____##name(struct pt_regs *ctx, ##args);				    \
typeof(name(0)) name(struct pt_regs *ctx)				    \
{									    \
	_Pragma("GCC diagnostic push")					    \
	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")		    \
	return ____##name(___bpf_kretprobe_args(args));			    \
	_Pragma("GCC diagnostic pop")					    \
}									    \
static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args)

#define ___bpf_fill0(arr, p, x) do {} while (0)
#define ___bpf_fill1(arr, p, x) arr[p] = x
#define ___bpf_fill2(arr, p, x, args...) arr[p] = x; ___bpf_fill1(arr, p + 1, args)
#define ___bpf_fill3(arr, p, x, args...) arr[p] = x; ___bpf_fill2(arr, p + 1, args)
#define ___bpf_fill4(arr, p, x, args...) arr[p] = x; ___bpf_fill3(arr, p + 1, args)
#define ___bpf_fill5(arr, p, x, args...) arr[p] = x; ___bpf_fill4(arr, p + 1, args)
#define ___bpf_fill6(arr, p, x, args...) arr[p] = x; ___bpf_fill5(arr, p + 1, args)
#define ___bpf_fill7(arr, p, x, args...) arr[p] = x; ___bpf_fill6(arr, p + 1, args)
#define ___bpf_fill8(arr, p, x, args...) arr[p] = x; ___bpf_fill7(arr, p + 1, args)
#define ___bpf_fill9(arr, p, x, args...) arr[p] = x; ___bpf_fill8(arr, p + 1, args)
#define ___bpf_fill10(arr, p, x, args...) arr[p] = x; ___bpf_fill9(arr, p + 1, args)
#define ___bpf_fill11(arr, p, x, args...) arr[p] = x; ___bpf_fill10(arr, p + 1, args)
#define ___bpf_fill12(arr, p, x, args...) arr[p] = x; ___bpf_fill11(arr, p + 1, args)
#define ___bpf_fill(arr, args...) \
	___bpf_apply(___bpf_fill, ___bpf_narg(args))(arr, 0, args)

/*
 * BPF_SEQ_PRINTF to wrap bpf_seq_printf to-be-printed values
 * in a structure.
 */
#define BPF_SEQ_PRINTF(seq, fmt, args...)			\
({								\
	static const char ___fmt[] = fmt;			\
	unsigned long long ___param[___bpf_narg(args)];		\
								\
	_Pragma("GCC diagnostic push")				\
	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")	\
	___bpf_fill(___param, args);				\
	_Pragma("GCC diagnostic pop")				\
								\
	bpf_seq_printf(seq, ___fmt, sizeof(___fmt),		\
		       ___param, sizeof(___param));		\
})

#endif