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
29 /* Fall back to what the compiler says */
30 #if defined(__x86_64__)
31 #define bpf_target_x86
32 #define bpf_target_defined
33 #elif defined(__s390__)
34 #define bpf_target_s390
35 #define bpf_target_defined
36 #elif defined(__arm__)
37 #define bpf_target_arm
38 #define bpf_target_defined
39 #elif defined(__aarch64__)
40 #define bpf_target_arm64
41 #define bpf_target_defined
42 #elif defined(__mips__)
43 #define bpf_target_mips
44 #define bpf_target_defined
45 #elif defined(__powerpc__)
46 #define bpf_target_powerpc
47 #define bpf_target_defined
48 #elif defined(__sparc__)
49 #define bpf_target_sparc
50 #define bpf_target_defined
51 #endif /* no compiler target */
55 #ifndef __BPF_TARGET_MISSING
56 #define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\""
59 #if defined(bpf_target_x86)
61 #if defined(__KERNEL__) || defined(__VMLINUX_H__)
63 #define PT_REGS_PARM1(x) ((x)->di)
64 #define PT_REGS_PARM2(x) ((x)->si)
65 #define PT_REGS_PARM3(x) ((x)->dx)
66 #define PT_REGS_PARM4(x) ((x)->cx)
67 #define PT_REGS_PARM5(x) ((x)->r8)
68 #define PT_REGS_RET(x) ((x)->sp)
69 #define PT_REGS_FP(x) ((x)->bp)
70 #define PT_REGS_RC(x) ((x)->ax)
71 #define PT_REGS_SP(x) ((x)->sp)
72 #define PT_REGS_IP(x) ((x)->ip)
74 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), di)
75 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), si)
76 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), dx)
77 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), cx)
78 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8)
79 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), sp)
80 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), bp)
81 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), ax)
82 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp)
83 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), ip)
88 /* i386 kernel is built with -mregparm=3 */
89 #define PT_REGS_PARM1(x) ((x)->eax)
90 #define PT_REGS_PARM2(x) ((x)->edx)
91 #define PT_REGS_PARM3(x) ((x)->ecx)
92 #define PT_REGS_PARM4(x) 0
93 #define PT_REGS_PARM5(x) 0
94 #define PT_REGS_RET(x) ((x)->esp)
95 #define PT_REGS_FP(x) ((x)->ebp)
96 #define PT_REGS_RC(x) ((x)->eax)
97 #define PT_REGS_SP(x) ((x)->esp)
98 #define PT_REGS_IP(x) ((x)->eip)
100 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), eax)
101 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), edx)
102 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), ecx)
103 #define PT_REGS_PARM4_CORE(x) 0
104 #define PT_REGS_PARM5_CORE(x) 0
105 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), esp)
106 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), ebp)
107 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), eax)
108 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), esp)
109 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), eip)
113 #define PT_REGS_PARM1(x) ((x)->rdi)
114 #define PT_REGS_PARM2(x) ((x)->rsi)
115 #define PT_REGS_PARM3(x) ((x)->rdx)
116 #define PT_REGS_PARM4(x) ((x)->rcx)
117 #define PT_REGS_PARM5(x) ((x)->r8)
118 #define PT_REGS_RET(x) ((x)->rsp)
119 #define PT_REGS_FP(x) ((x)->rbp)
120 #define PT_REGS_RC(x) ((x)->rax)
121 #define PT_REGS_SP(x) ((x)->rsp)
122 #define PT_REGS_IP(x) ((x)->rip)
124 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), rdi)
125 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), rsi)
126 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), rdx)
127 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), rcx)
128 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8)
129 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), rsp)
130 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), rbp)
131 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), rax)
132 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), rsp)
133 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), rip)
138 #elif defined(bpf_target_s390)
140 /* s390 provides user_pt_regs instead of struct pt_regs to userspace */
142 #define PT_REGS_S390 const volatile user_pt_regs
143 #define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2])
144 #define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3])
145 #define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4])
146 #define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5])
147 #define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6])
148 #define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14])
149 /* Works only with CONFIG_FRAME_POINTER */
150 #define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11])
151 #define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2])
152 #define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15])
153 #define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr)
155 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2])
156 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[3])
157 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[4])
158 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[5])
159 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[6])
160 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[14])
161 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[11])
162 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2])
163 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[15])
164 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), psw.addr)
166 #elif defined(bpf_target_arm)
168 #define PT_REGS_PARM1(x) ((x)->uregs[0])
169 #define PT_REGS_PARM2(x) ((x)->uregs[1])
170 #define PT_REGS_PARM3(x) ((x)->uregs[2])
171 #define PT_REGS_PARM4(x) ((x)->uregs[3])
172 #define PT_REGS_PARM5(x) ((x)->uregs[4])
173 #define PT_REGS_RET(x) ((x)->uregs[14])
174 #define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */
175 #define PT_REGS_RC(x) ((x)->uregs[0])
176 #define PT_REGS_SP(x) ((x)->uregs[13])
177 #define PT_REGS_IP(x) ((x)->uregs[12])
179 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), uregs[0])
180 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), uregs[1])
181 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), uregs[2])
182 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), uregs[3])
183 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), uregs[4])
184 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), uregs[14])
185 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), uregs[11])
186 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), uregs[0])
187 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), uregs[13])
188 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), uregs[12])
190 #elif defined(bpf_target_arm64)
192 /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */
194 #define PT_REGS_ARM64 const volatile struct user_pt_regs
195 #define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0])
196 #define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1])
197 #define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2])
198 #define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3])
199 #define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4])
200 #define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30])
201 /* Works only with CONFIG_FRAME_POINTER */
202 #define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29])
203 #define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0])
204 #define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp)
205 #define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc)
207 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0])
208 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[1])
209 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[2])
210 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[3])
211 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[4])
212 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[30])
213 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[29])
214 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0])
215 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), sp)
216 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), pc)
218 #elif defined(bpf_target_mips)
220 #define PT_REGS_PARM1(x) ((x)->regs[4])
221 #define PT_REGS_PARM2(x) ((x)->regs[5])
222 #define PT_REGS_PARM3(x) ((x)->regs[6])
223 #define PT_REGS_PARM4(x) ((x)->regs[7])
224 #define PT_REGS_PARM5(x) ((x)->regs[8])
225 #define PT_REGS_RET(x) ((x)->regs[31])
226 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
227 #define PT_REGS_RC(x) ((x)->regs[2])
228 #define PT_REGS_SP(x) ((x)->regs[29])
229 #define PT_REGS_IP(x) ((x)->cp0_epc)
231 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), regs[4])
232 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), regs[5])
233 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), regs[6])
234 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), regs[7])
235 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8])
236 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31])
237 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30])
238 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[2])
239 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29])
240 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc)
242 #elif defined(bpf_target_powerpc)
244 #define PT_REGS_PARM1(x) ((x)->gpr[3])
245 #define PT_REGS_PARM2(x) ((x)->gpr[4])
246 #define PT_REGS_PARM3(x) ((x)->gpr[5])
247 #define PT_REGS_PARM4(x) ((x)->gpr[6])
248 #define PT_REGS_PARM5(x) ((x)->gpr[7])
249 #define PT_REGS_RC(x) ((x)->gpr[3])
250 #define PT_REGS_SP(x) ((x)->sp)
251 #define PT_REGS_IP(x) ((x)->nip)
253 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), gpr[3])
254 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), gpr[4])
255 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), gpr[5])
256 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), gpr[6])
257 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), gpr[7])
258 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), gpr[3])
259 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp)
260 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), nip)
262 #elif defined(bpf_target_sparc)
264 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
265 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
266 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
267 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
268 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
269 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
270 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
271 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
273 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0])
274 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I1])
275 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I2])
276 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I3])
277 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I4])
278 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I7])
279 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0])
280 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), u_regs[UREG_FP])
282 /* Should this also be a bpf_target check for the sparc case? */
283 #if defined(__arch64__)
284 #define PT_REGS_IP(x) ((x)->tpc)
285 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), tpc)
287 #define PT_REGS_IP(x) ((x)->pc)
288 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), pc)
293 #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
296 #elif defined(bpf_target_sparc)
297 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
298 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
299 #elif defined(bpf_target_defined)
300 #define BPF_KPROBE_READ_RET_IP(ip, ctx) \
301 ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
302 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \
303 ({ bpf_probe_read_kernel(&(ip), sizeof(ip), \
304 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
307 #if !defined(bpf_target_defined)
309 #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
310 #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
311 #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
312 #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
313 #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
314 #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
315 #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
316 #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
317 #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
318 #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
320 #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
321 #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
322 #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
323 #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
324 #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
325 #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
326 #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
327 #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
328 #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
329 #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
331 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
332 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
334 #endif /* !defined(bpf_target_defined) */
336 #ifndef ___bpf_concat
337 #define ___bpf_concat(a, b) a ## b
340 #define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
343 #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
346 #define ___bpf_narg(...) \
347 ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
350 #define ___bpf_ctx_cast0() ctx
351 #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0]
352 #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1]
353 #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2]
354 #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3]
355 #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4]
356 #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5]
357 #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6]
358 #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7]
359 #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8]
360 #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9]
361 #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10]
362 #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11]
363 #define ___bpf_ctx_cast(args...) \
364 ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args)
367 * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and
368 * similar kinds of BPF programs, that accept input arguments as a single
369 * pointer to untyped u64 array, where each u64 can actually be a typed
370 * pointer or integer of different size. Instead of requring user to write
371 * manual casts and work with array elements by index, BPF_PROG macro
372 * allows user to declare a list of named and typed input arguments in the
373 * same syntax as for normal C function. All the casting is hidden and
374 * performed transparently, while user code can just assume working with
375 * function arguments of specified type and name.
377 * Original raw context argument is preserved as well as 'ctx' argument.
378 * This is useful when using BPF helpers that expect original context
379 * as one of the parameters (e.g., for bpf_perf_event_output()).
381 #define BPF_PROG(name, args...) \
382 name(unsigned long long *ctx); \
383 static __attribute__((always_inline)) typeof(name(0)) \
384 ____##name(unsigned long long *ctx, ##args); \
385 typeof(name(0)) name(unsigned long long *ctx) \
387 _Pragma("GCC diagnostic push") \
388 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
389 return ____##name(___bpf_ctx_cast(args)); \
390 _Pragma("GCC diagnostic pop") \
392 static __attribute__((always_inline)) typeof(name(0)) \
393 ____##name(unsigned long long *ctx, ##args)
397 #define ___bpf_kprobe_args0() ctx
398 #define ___bpf_kprobe_args1(x) \
399 ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx)
400 #define ___bpf_kprobe_args2(x, args...) \
401 ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx)
402 #define ___bpf_kprobe_args3(x, args...) \
403 ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx)
404 #define ___bpf_kprobe_args4(x, args...) \
405 ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx)
406 #define ___bpf_kprobe_args5(x, args...) \
407 ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx)
408 #define ___bpf_kprobe_args(args...) \
409 ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args)
412 * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for
413 * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific
414 * low-level way of getting kprobe input arguments from struct pt_regs, and
415 * provides a familiar typed and named function arguments syntax and
416 * semantics of accessing kprobe input paremeters.
418 * Original struct pt_regs* context is preserved as 'ctx' argument. This might
419 * be necessary when using BPF helpers like bpf_perf_event_output().
421 #define BPF_KPROBE(name, args...) \
422 name(struct pt_regs *ctx); \
423 static __attribute__((always_inline)) typeof(name(0)) \
424 ____##name(struct pt_regs *ctx, ##args); \
425 typeof(name(0)) name(struct pt_regs *ctx) \
427 _Pragma("GCC diagnostic push") \
428 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
429 return ____##name(___bpf_kprobe_args(args)); \
430 _Pragma("GCC diagnostic pop") \
432 static __attribute__((always_inline)) typeof(name(0)) \
433 ____##name(struct pt_regs *ctx, ##args)
435 #define ___bpf_kretprobe_args0() ctx
436 #define ___bpf_kretprobe_args1(x) \
437 ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx)
438 #define ___bpf_kretprobe_args(args...) \
439 ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args)
442 * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional
443 * return value (in addition to `struct pt_regs *ctx`), but no input
444 * arguments, because they will be clobbered by the time probed function
447 #define BPF_KRETPROBE(name, args...) \
448 name(struct pt_regs *ctx); \
449 static __attribute__((always_inline)) typeof(name(0)) \
450 ____##name(struct pt_regs *ctx, ##args); \
451 typeof(name(0)) name(struct pt_regs *ctx) \
453 _Pragma("GCC diagnostic push") \
454 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
455 return ____##name(___bpf_kretprobe_args(args)); \
456 _Pragma("GCC diagnostic pop") \
458 static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args)