1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
2 #ifndef __BPF_TRACING_H__
3 #define __BPF_TRACING_H__
5 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */
6 #if defined(__TARGET_ARCH_x86)
8 #define bpf_target_defined
9 #elif defined(__TARGET_ARCH_s390)
10 #define bpf_target_s390
11 #define bpf_target_defined
12 #elif defined(__TARGET_ARCH_arm)
13 #define bpf_target_arm
14 #define bpf_target_defined
15 #elif defined(__TARGET_ARCH_arm64)
16 #define bpf_target_arm64
17 #define bpf_target_defined
18 #elif defined(__TARGET_ARCH_mips)
19 #define bpf_target_mips
20 #define bpf_target_defined
21 #elif defined(__TARGET_ARCH_powerpc)
22 #define bpf_target_powerpc
23 #define bpf_target_defined
24 #elif defined(__TARGET_ARCH_sparc)
25 #define bpf_target_sparc
26 #define bpf_target_defined
27 #elif defined(__TARGET_ARCH_riscv)
28 #define bpf_target_riscv
29 #define bpf_target_defined
30 #elif defined(__TARGET_ARCH_arc)
31 #define bpf_target_arc
32 #define bpf_target_defined
35 /* Fall back to what the compiler says */
36 #if defined(__x86_64__)
37 #define bpf_target_x86
38 #define bpf_target_defined
39 #elif defined(__s390__)
40 #define bpf_target_s390
41 #define bpf_target_defined
42 #elif defined(__arm__)
43 #define bpf_target_arm
44 #define bpf_target_defined
45 #elif defined(__aarch64__)
46 #define bpf_target_arm64
47 #define bpf_target_defined
48 #elif defined(__mips__)
49 #define bpf_target_mips
50 #define bpf_target_defined
51 #elif defined(__powerpc__)
52 #define bpf_target_powerpc
53 #define bpf_target_defined
54 #elif defined(__sparc__)
55 #define bpf_target_sparc
56 #define bpf_target_defined
57 #elif defined(__riscv) && __riscv_xlen == 64
58 #define bpf_target_riscv
59 #define bpf_target_defined
60 #elif defined(__arc__)
61 #define bpf_target_arc
62 #define bpf_target_defined
63 #endif /* no compiler target */
67 #ifndef __BPF_TARGET_MISSING
68 #define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\""
71 #if defined(bpf_target_x86)
73 #if defined(__KERNEL__) || defined(__VMLINUX_H__)
75 #define __PT_PARM1_REG di
76 #define __PT_PARM2_REG si
77 #define __PT_PARM3_REG dx
78 #define __PT_PARM4_REG cx
79 #define __PT_PARM5_REG r8
80 #define __PT_RET_REG sp
81 #define __PT_FP_REG bp
82 #define __PT_RC_REG ax
83 #define __PT_SP_REG sp
84 #define __PT_IP_REG ip
85 /* syscall uses r10 for PARM4 */
86 #define PT_REGS_PARM4_SYSCALL(x) ((x)->r10)
87 #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10)
93 #define __PT_PARM1_REG eax
94 #define __PT_PARM2_REG edx
95 #define __PT_PARM3_REG ecx
96 /* i386 kernel is built with -mregparm=3 */
97 #define __PT_PARM4_REG __unsupported__
98 #define __PT_PARM5_REG __unsupported__
99 #define __PT_RET_REG esp
100 #define __PT_FP_REG ebp
101 #define __PT_RC_REG eax
102 #define __PT_SP_REG esp
103 #define __PT_IP_REG eip
107 #define __PT_PARM1_REG rdi
108 #define __PT_PARM2_REG rsi
109 #define __PT_PARM3_REG rdx
110 #define __PT_PARM4_REG rcx
111 #define __PT_PARM5_REG r8
112 #define __PT_RET_REG rsp
113 #define __PT_FP_REG rbp
114 #define __PT_RC_REG rax
115 #define __PT_SP_REG rsp
116 #define __PT_IP_REG rip
117 /* syscall uses r10 for PARM4 */
118 #define PT_REGS_PARM4_SYSCALL(x) ((x)->r10)
119 #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10)
121 #endif /* __i386__ */
123 #endif /* __KERNEL__ || __VMLINUX_H__ */
125 #elif defined(bpf_target_s390)
127 struct pt_regs___s390 {
128 unsigned long orig_gpr2;
131 /* s390 provides user_pt_regs instead of struct pt_regs to userspace */
132 #define __PT_REGS_CAST(x) ((const user_pt_regs *)(x))
133 #define __PT_PARM1_REG gprs[2]
134 #define __PT_PARM2_REG gprs[3]
135 #define __PT_PARM3_REG gprs[4]
136 #define __PT_PARM4_REG gprs[5]
137 #define __PT_PARM5_REG gprs[6]
138 #define __PT_RET_REG grps[14]
139 #define __PT_FP_REG gprs[11] /* Works only with CONFIG_FRAME_POINTER */
140 #define __PT_RC_REG gprs[2]
141 #define __PT_SP_REG gprs[15]
142 #define __PT_IP_REG psw.addr
143 #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma("GCC error \"use PT_REGS_PARM1_CORE_SYSCALL() instead\""); 0l; })
144 #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ((const struct pt_regs___s390 *)(x), orig_gpr2)
146 #elif defined(bpf_target_arm)
148 #define __PT_PARM1_REG uregs[0]
149 #define __PT_PARM2_REG uregs[1]
150 #define __PT_PARM3_REG uregs[2]
151 #define __PT_PARM4_REG uregs[3]
152 #define __PT_PARM5_REG uregs[4]
153 #define __PT_RET_REG uregs[14]
154 #define __PT_FP_REG uregs[11] /* Works only with CONFIG_FRAME_POINTER */
155 #define __PT_RC_REG uregs[0]
156 #define __PT_SP_REG uregs[13]
157 #define __PT_IP_REG uregs[12]
159 #elif defined(bpf_target_arm64)
161 struct pt_regs___arm64 {
162 unsigned long orig_x0;
165 /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */
166 #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x))
167 #define __PT_PARM1_REG regs[0]
168 #define __PT_PARM2_REG regs[1]
169 #define __PT_PARM3_REG regs[2]
170 #define __PT_PARM4_REG regs[3]
171 #define __PT_PARM5_REG regs[4]
172 #define __PT_RET_REG regs[30]
173 #define __PT_FP_REG regs[29] /* Works only with CONFIG_FRAME_POINTER */
174 #define __PT_RC_REG regs[0]
175 #define __PT_SP_REG sp
176 #define __PT_IP_REG pc
177 #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma("GCC error \"use PT_REGS_PARM1_CORE_SYSCALL() instead\""); 0l; })
178 #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ((const struct pt_regs___arm64 *)(x), orig_x0)
180 #elif defined(bpf_target_mips)
182 #define __PT_PARM1_REG regs[4]
183 #define __PT_PARM2_REG regs[5]
184 #define __PT_PARM3_REG regs[6]
185 #define __PT_PARM4_REG regs[7]
186 #define __PT_PARM5_REG regs[8]
187 #define __PT_RET_REG regs[31]
188 #define __PT_FP_REG regs[30] /* Works only with CONFIG_FRAME_POINTER */
189 #define __PT_RC_REG regs[2]
190 #define __PT_SP_REG regs[29]
191 #define __PT_IP_REG cp0_epc
193 #elif defined(bpf_target_powerpc)
195 #define __PT_PARM1_REG gpr[3]
196 #define __PT_PARM2_REG gpr[4]
197 #define __PT_PARM3_REG gpr[5]
198 #define __PT_PARM4_REG gpr[6]
199 #define __PT_PARM5_REG gpr[7]
200 #define __PT_RET_REG regs[31]
201 #define __PT_FP_REG __unsupported__
202 #define __PT_RC_REG gpr[3]
203 #define __PT_SP_REG sp
204 #define __PT_IP_REG nip
205 /* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER. */
206 #define PT_REGS_SYSCALL_REGS(ctx) ctx
208 #elif defined(bpf_target_sparc)
210 #define __PT_PARM1_REG u_regs[UREG_I0]
211 #define __PT_PARM2_REG u_regs[UREG_I1]
212 #define __PT_PARM3_REG u_regs[UREG_I2]
213 #define __PT_PARM4_REG u_regs[UREG_I3]
214 #define __PT_PARM5_REG u_regs[UREG_I4]
215 #define __PT_RET_REG u_regs[UREG_I7]
216 #define __PT_FP_REG __unsupported__
217 #define __PT_RC_REG u_regs[UREG_I0]
218 #define __PT_SP_REG u_regs[UREG_FP]
219 /* Should this also be a bpf_target check for the sparc case? */
220 #if defined(__arch64__)
221 #define __PT_IP_REG tpc
223 #define __PT_IP_REG pc
226 #elif defined(bpf_target_riscv)
228 #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x))
229 #define __PT_PARM1_REG a0
230 #define __PT_PARM2_REG a1
231 #define __PT_PARM3_REG a2
232 #define __PT_PARM4_REG a3
233 #define __PT_PARM5_REG a4
234 #define __PT_RET_REG ra
235 #define __PT_FP_REG s0
236 #define __PT_RC_REG a0
237 #define __PT_SP_REG sp
238 #define __PT_IP_REG pc
239 /* riscv does not select ARCH_HAS_SYSCALL_WRAPPER. */
240 #define PT_REGS_SYSCALL_REGS(ctx) ctx
242 #elif defined(bpf_target_arc)
244 /* arc provides struct user_pt_regs instead of struct pt_regs to userspace */
245 #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x))
246 #define __PT_PARM1_REG scratch.r0
247 #define __PT_PARM2_REG scratch.r1
248 #define __PT_PARM3_REG scratch.r2
249 #define __PT_PARM4_REG scratch.r3
250 #define __PT_PARM5_REG scratch.r4
251 #define __PT_RET_REG scratch.blink
252 #define __PT_FP_REG __unsupported__
253 #define __PT_RC_REG scratch.r0
254 #define __PT_SP_REG scratch.sp
255 #define __PT_IP_REG scratch.ret
256 /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */
257 #define PT_REGS_SYSCALL_REGS(ctx) ctx
261 #if defined(bpf_target_defined)
265 /* allow some architecutres to override `struct pt_regs` */
266 #ifndef __PT_REGS_CAST
267 #define __PT_REGS_CAST(x) (x)
270 #define PT_REGS_PARM1(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG)
271 #define PT_REGS_PARM2(x) (__PT_REGS_CAST(x)->__PT_PARM2_REG)
272 #define PT_REGS_PARM3(x) (__PT_REGS_CAST(x)->__PT_PARM3_REG)
273 #define PT_REGS_PARM4(x) (__PT_REGS_CAST(x)->__PT_PARM4_REG)
274 #define PT_REGS_PARM5(x) (__PT_REGS_CAST(x)->__PT_PARM5_REG)
275 #define PT_REGS_RET(x) (__PT_REGS_CAST(x)->__PT_RET_REG)
276 #define PT_REGS_FP(x) (__PT_REGS_CAST(x)->__PT_FP_REG)
277 #define PT_REGS_RC(x) (__PT_REGS_CAST(x)->__PT_RC_REG)
278 #define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG)
279 #define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG)
281 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_REG)
282 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_REG)
283 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_REG)
284 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_REG)
285 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_REG)
286 #define PT_REGS_RET_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RET_REG)
287 #define PT_REGS_FP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_FP_REG)
288 #define PT_REGS_RC_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RC_REG)
289 #define PT_REGS_SP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_SP_REG)
290 #define PT_REGS_IP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_IP_REG)
292 #if defined(bpf_target_powerpc)
294 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
295 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
297 #elif defined(bpf_target_sparc)
299 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
300 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
304 #define BPF_KPROBE_READ_RET_IP(ip, ctx) \
305 ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
306 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \
307 ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
311 #ifndef PT_REGS_PARM1_SYSCALL
312 #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1(x)
314 #define PT_REGS_PARM2_SYSCALL(x) PT_REGS_PARM2(x)
315 #define PT_REGS_PARM3_SYSCALL(x) PT_REGS_PARM3(x)
316 #ifndef PT_REGS_PARM4_SYSCALL
317 #define PT_REGS_PARM4_SYSCALL(x) PT_REGS_PARM4(x)
319 #define PT_REGS_PARM5_SYSCALL(x) PT_REGS_PARM5(x)
321 #ifndef PT_REGS_PARM1_CORE_SYSCALL
322 #define PT_REGS_PARM1_CORE_SYSCALL(x) PT_REGS_PARM1_CORE(x)
324 #define PT_REGS_PARM2_CORE_SYSCALL(x) PT_REGS_PARM2_CORE(x)
325 #define PT_REGS_PARM3_CORE_SYSCALL(x) PT_REGS_PARM3_CORE(x)
326 #ifndef PT_REGS_PARM4_CORE_SYSCALL
327 #define PT_REGS_PARM4_CORE_SYSCALL(x) PT_REGS_PARM4_CORE(x)
329 #define PT_REGS_PARM5_CORE_SYSCALL(x) PT_REGS_PARM5_CORE(x)
331 #else /* defined(bpf_target_defined) */
333 #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
334 #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
335 #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
336 #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
337 #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
338 #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
339 #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
340 #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
341 #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
342 #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
344 #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
345 #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
346 #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
347 #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
348 #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
349 #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
350 #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
351 #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
352 #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
353 #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
355 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
356 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
358 #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
359 #define PT_REGS_PARM2_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
360 #define PT_REGS_PARM3_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
361 #define PT_REGS_PARM4_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
362 #define PT_REGS_PARM5_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
364 #define PT_REGS_PARM1_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
365 #define PT_REGS_PARM2_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
366 #define PT_REGS_PARM3_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
367 #define PT_REGS_PARM4_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
368 #define PT_REGS_PARM5_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
370 #endif /* defined(bpf_target_defined) */
373 * When invoked from a syscall handler kprobe, returns a pointer to a
374 * struct pt_regs containing syscall arguments and suitable for passing to
375 * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL().
377 #ifndef PT_REGS_SYSCALL_REGS
378 /* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */
379 #define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx))
382 #ifndef ___bpf_concat
383 #define ___bpf_concat(a, b) a ## b
386 #define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
389 #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
392 #define ___bpf_narg(...) ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
395 #define ___bpf_ctx_cast0() ctx
396 #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0]
397 #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1]
398 #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2]
399 #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3]
400 #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4]
401 #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5]
402 #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6]
403 #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7]
404 #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8]
405 #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9]
406 #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10]
407 #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11]
408 #define ___bpf_ctx_cast(args...) ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args)
411 * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and
412 * similar kinds of BPF programs, that accept input arguments as a single
413 * pointer to untyped u64 array, where each u64 can actually be a typed
414 * pointer or integer of different size. Instead of requring user to write
415 * manual casts and work with array elements by index, BPF_PROG macro
416 * allows user to declare a list of named and typed input arguments in the
417 * same syntax as for normal C function. All the casting is hidden and
418 * performed transparently, while user code can just assume working with
419 * function arguments of specified type and name.
421 * Original raw context argument is preserved as well as 'ctx' argument.
422 * This is useful when using BPF helpers that expect original context
423 * as one of the parameters (e.g., for bpf_perf_event_output()).
425 #define BPF_PROG(name, args...) \
426 name(unsigned long long *ctx); \
427 static __attribute__((always_inline)) typeof(name(0)) \
428 ____##name(unsigned long long *ctx, ##args); \
429 typeof(name(0)) name(unsigned long long *ctx) \
431 _Pragma("GCC diagnostic push") \
432 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
433 return ____##name(___bpf_ctx_cast(args)); \
434 _Pragma("GCC diagnostic pop") \
436 static __attribute__((always_inline)) typeof(name(0)) \
437 ____##name(unsigned long long *ctx, ##args)
441 #define ___bpf_kprobe_args0() ctx
442 #define ___bpf_kprobe_args1(x) ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx)
443 #define ___bpf_kprobe_args2(x, args...) ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx)
444 #define ___bpf_kprobe_args3(x, args...) ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx)
445 #define ___bpf_kprobe_args4(x, args...) ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx)
446 #define ___bpf_kprobe_args5(x, args...) ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx)
447 #define ___bpf_kprobe_args(args...) ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args)
450 * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for
451 * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific
452 * low-level way of getting kprobe input arguments from struct pt_regs, and
453 * provides a familiar typed and named function arguments syntax and
454 * semantics of accessing kprobe input paremeters.
456 * Original struct pt_regs* context is preserved as 'ctx' argument. This might
457 * be necessary when using BPF helpers like bpf_perf_event_output().
459 #define BPF_KPROBE(name, args...) \
460 name(struct pt_regs *ctx); \
461 static __attribute__((always_inline)) typeof(name(0)) \
462 ____##name(struct pt_regs *ctx, ##args); \
463 typeof(name(0)) name(struct pt_regs *ctx) \
465 _Pragma("GCC diagnostic push") \
466 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
467 return ____##name(___bpf_kprobe_args(args)); \
468 _Pragma("GCC diagnostic pop") \
470 static __attribute__((always_inline)) typeof(name(0)) \
471 ____##name(struct pt_regs *ctx, ##args)
473 #define ___bpf_kretprobe_args0() ctx
474 #define ___bpf_kretprobe_args1(x) ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx)
475 #define ___bpf_kretprobe_args(args...) ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args)
478 * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional
479 * return value (in addition to `struct pt_regs *ctx`), but no input
480 * arguments, because they will be clobbered by the time probed function
483 #define BPF_KRETPROBE(name, args...) \
484 name(struct pt_regs *ctx); \
485 static __attribute__((always_inline)) typeof(name(0)) \
486 ____##name(struct pt_regs *ctx, ##args); \
487 typeof(name(0)) name(struct pt_regs *ctx) \
489 _Pragma("GCC diagnostic push") \
490 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
491 return ____##name(___bpf_kretprobe_args(args)); \
492 _Pragma("GCC diagnostic pop") \
494 static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args)
496 #define ___bpf_syscall_args0() ctx
497 #define ___bpf_syscall_args1(x) ___bpf_syscall_args0(), (void *)PT_REGS_PARM1_CORE_SYSCALL(regs)
498 #define ___bpf_syscall_args2(x, args...) ___bpf_syscall_args1(args), (void *)PT_REGS_PARM2_CORE_SYSCALL(regs)
499 #define ___bpf_syscall_args3(x, args...) ___bpf_syscall_args2(args), (void *)PT_REGS_PARM3_CORE_SYSCALL(regs)
500 #define ___bpf_syscall_args4(x, args...) ___bpf_syscall_args3(args), (void *)PT_REGS_PARM4_CORE_SYSCALL(regs)
501 #define ___bpf_syscall_args5(x, args...) ___bpf_syscall_args4(args), (void *)PT_REGS_PARM5_CORE_SYSCALL(regs)
502 #define ___bpf_syscall_args(args...) ___bpf_apply(___bpf_syscall_args, ___bpf_narg(args))(args)
505 * BPF_KPROBE_SYSCALL is a variant of BPF_KPROBE, which is intended for
506 * tracing syscall functions, like __x64_sys_close. It hides the underlying
507 * platform-specific low-level way of getting syscall input arguments from
508 * struct pt_regs, and provides a familiar typed and named function arguments
509 * syntax and semantics of accessing syscall input parameters.
511 * Original struct pt_regs* context is preserved as 'ctx' argument. This might
512 * be necessary when using BPF helpers like bpf_perf_event_output().
514 * This macro relies on BPF CO-RE support.
516 #define BPF_KPROBE_SYSCALL(name, args...) \
517 name(struct pt_regs *ctx); \
518 static __attribute__((always_inline)) typeof(name(0)) \
519 ____##name(struct pt_regs *ctx, ##args); \
520 typeof(name(0)) name(struct pt_regs *ctx) \
522 struct pt_regs *regs = PT_REGS_SYSCALL_REGS(ctx); \
523 _Pragma("GCC diagnostic push") \
524 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
525 return ____##name(___bpf_syscall_args(args)); \
526 _Pragma("GCC diagnostic pop") \
528 static __attribute__((always_inline)) typeof(name(0)) \
529 ____##name(struct pt_regs *ctx, ##args)