Commit | Line | Data |
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3ac4dbe3 AN |
1 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
2 | #ifndef __BPF_TRACING_H__ | |
3 | #define __BPF_TRACING_H__ | |
4 | ||
6f5d467d AN |
5 | #include <bpf/bpf_helpers.h> |
6 | ||
3ac4dbe3 AN |
7 | /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ |
8 | #if defined(__TARGET_ARCH_x86) | |
9 | #define bpf_target_x86 | |
10 | #define bpf_target_defined | |
11 | #elif defined(__TARGET_ARCH_s390) | |
12 | #define bpf_target_s390 | |
13 | #define bpf_target_defined | |
14 | #elif defined(__TARGET_ARCH_arm) | |
15 | #define bpf_target_arm | |
16 | #define bpf_target_defined | |
17 | #elif defined(__TARGET_ARCH_arm64) | |
18 | #define bpf_target_arm64 | |
19 | #define bpf_target_defined | |
20 | #elif defined(__TARGET_ARCH_mips) | |
21 | #define bpf_target_mips | |
22 | #define bpf_target_defined | |
23 | #elif defined(__TARGET_ARCH_powerpc) | |
24 | #define bpf_target_powerpc | |
25 | #define bpf_target_defined | |
26 | #elif defined(__TARGET_ARCH_sparc) | |
27 | #define bpf_target_sparc | |
28 | #define bpf_target_defined | |
589fed47 BT |
29 | #elif defined(__TARGET_ARCH_riscv) |
30 | #define bpf_target_riscv | |
31 | #define bpf_target_defined | |
07385998 VI |
32 | #elif defined(__TARGET_ARCH_arc) |
33 | #define bpf_target_arc | |
34 | #define bpf_target_defined | |
3ac4dbe3 | 35 | #else |
3ac4dbe3 AN |
36 | |
37 | /* Fall back to what the compiler says */ | |
3ac4dbe3 AN |
38 | #if defined(__x86_64__) |
39 | #define bpf_target_x86 | |
4a638d58 | 40 | #define bpf_target_defined |
3ac4dbe3 AN |
41 | #elif defined(__s390__) |
42 | #define bpf_target_s390 | |
4a638d58 | 43 | #define bpf_target_defined |
3ac4dbe3 AN |
44 | #elif defined(__arm__) |
45 | #define bpf_target_arm | |
4a638d58 | 46 | #define bpf_target_defined |
3ac4dbe3 AN |
47 | #elif defined(__aarch64__) |
48 | #define bpf_target_arm64 | |
4a638d58 | 49 | #define bpf_target_defined |
3ac4dbe3 AN |
50 | #elif defined(__mips__) |
51 | #define bpf_target_mips | |
4a638d58 | 52 | #define bpf_target_defined |
3ac4dbe3 AN |
53 | #elif defined(__powerpc__) |
54 | #define bpf_target_powerpc | |
4a638d58 | 55 | #define bpf_target_defined |
3ac4dbe3 AN |
56 | #elif defined(__sparc__) |
57 | #define bpf_target_sparc | |
4a638d58 | 58 | #define bpf_target_defined |
589fed47 BT |
59 | #elif defined(__riscv) && __riscv_xlen == 64 |
60 | #define bpf_target_riscv | |
61 | #define bpf_target_defined | |
07385998 VI |
62 | #elif defined(__arc__) |
63 | #define bpf_target_arc | |
64 | #define bpf_target_defined | |
4a638d58 LB |
65 | #endif /* no compiler target */ |
66 | ||
3ac4dbe3 | 67 | #endif |
4a638d58 LB |
68 | |
69 | #ifndef __BPF_TARGET_MISSING | |
70 | #define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\"" | |
3ac4dbe3 AN |
71 | #endif |
72 | ||
73 | #if defined(bpf_target_x86) | |
74 | ||
fd56e005 | 75 | #if defined(__KERNEL__) || defined(__VMLINUX_H__) |
b8ebce86 | 76 | |
3cc31d79 AN |
77 | #define __PT_PARM1_REG di |
78 | #define __PT_PARM2_REG si | |
79 | #define __PT_PARM3_REG dx | |
80 | #define __PT_PARM4_REG cx | |
81 | #define __PT_PARM5_REG r8 | |
82 | #define __PT_RET_REG sp | |
83 | #define __PT_FP_REG bp | |
84 | #define __PT_RC_REG ax | |
85 | #define __PT_SP_REG sp | |
86 | #define __PT_IP_REG ip | |
60d16c5c IL |
87 | /* syscall uses r10 for PARM4 */ |
88 | #define PT_REGS_PARM4_SYSCALL(x) ((x)->r10) | |
89 | #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10) | |
b8ebce86 | 90 | |
3ac4dbe3 | 91 | #else |
b8ebce86 | 92 | |
3ac4dbe3 | 93 | #ifdef __i386__ |
b8ebce86 | 94 | |
3cc31d79 AN |
95 | #define __PT_PARM1_REG eax |
96 | #define __PT_PARM2_REG edx | |
97 | #define __PT_PARM3_REG ecx | |
98 | /* i386 kernel is built with -mregparm=3 */ | |
99 | #define __PT_PARM4_REG __unsupported__ | |
100 | #define __PT_PARM5_REG __unsupported__ | |
101 | #define __PT_RET_REG esp | |
102 | #define __PT_FP_REG ebp | |
103 | #define __PT_RC_REG eax | |
104 | #define __PT_SP_REG esp | |
105 | #define __PT_IP_REG eip | |
106 | ||
107 | #else /* __i386__ */ | |
108 | ||
109 | #define __PT_PARM1_REG rdi | |
110 | #define __PT_PARM2_REG rsi | |
111 | #define __PT_PARM3_REG rdx | |
112 | #define __PT_PARM4_REG rcx | |
113 | #define __PT_PARM5_REG r8 | |
114 | #define __PT_RET_REG rsp | |
115 | #define __PT_FP_REG rbp | |
116 | #define __PT_RC_REG rax | |
117 | #define __PT_SP_REG rsp | |
118 | #define __PT_IP_REG rip | |
60d16c5c IL |
119 | /* syscall uses r10 for PARM4 */ |
120 | #define PT_REGS_PARM4_SYSCALL(x) ((x)->r10) | |
121 | #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10) | |
3cc31d79 AN |
122 | |
123 | #endif /* __i386__ */ | |
124 | ||
125 | #endif /* __KERNEL__ || __VMLINUX_H__ */ | |
3ac4dbe3 AN |
126 | |
127 | #elif defined(bpf_target_s390) | |
128 | ||
1f22a6f9 IL |
129 | struct pt_regs___s390 { |
130 | unsigned long orig_gpr2; | |
131 | }; | |
132 | ||
3ac4dbe3 | 133 | /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ |
3cc31d79 AN |
134 | #define __PT_REGS_CAST(x) ((const user_pt_regs *)(x)) |
135 | #define __PT_PARM1_REG gprs[2] | |
136 | #define __PT_PARM2_REG gprs[3] | |
137 | #define __PT_PARM3_REG gprs[4] | |
138 | #define __PT_PARM4_REG gprs[5] | |
139 | #define __PT_PARM5_REG gprs[6] | |
140 | #define __PT_RET_REG grps[14] | |
141 | #define __PT_FP_REG gprs[11] /* Works only with CONFIG_FRAME_POINTER */ | |
142 | #define __PT_RC_REG gprs[2] | |
143 | #define __PT_SP_REG gprs[15] | |
144 | #define __PT_IP_REG psw.addr | |
6f5d467d | 145 | #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) |
1f22a6f9 | 146 | #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ((const struct pt_regs___s390 *)(x), orig_gpr2) |
b8ebce86 | 147 | |
3ac4dbe3 AN |
148 | #elif defined(bpf_target_arm) |
149 | ||
3cc31d79 AN |
150 | #define __PT_PARM1_REG uregs[0] |
151 | #define __PT_PARM2_REG uregs[1] | |
152 | #define __PT_PARM3_REG uregs[2] | |
153 | #define __PT_PARM4_REG uregs[3] | |
154 | #define __PT_PARM5_REG uregs[4] | |
155 | #define __PT_RET_REG uregs[14] | |
156 | #define __PT_FP_REG uregs[11] /* Works only with CONFIG_FRAME_POINTER */ | |
157 | #define __PT_RC_REG uregs[0] | |
158 | #define __PT_SP_REG uregs[13] | |
159 | #define __PT_IP_REG uregs[12] | |
b8ebce86 | 160 | |
3ac4dbe3 AN |
161 | #elif defined(bpf_target_arm64) |
162 | ||
fbca4a2f IL |
163 | struct pt_regs___arm64 { |
164 | unsigned long orig_x0; | |
165 | }; | |
166 | ||
3ac4dbe3 | 167 | /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ |
3cc31d79 AN |
168 | #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) |
169 | #define __PT_PARM1_REG regs[0] | |
170 | #define __PT_PARM2_REG regs[1] | |
171 | #define __PT_PARM3_REG regs[2] | |
172 | #define __PT_PARM4_REG regs[3] | |
173 | #define __PT_PARM5_REG regs[4] | |
174 | #define __PT_RET_REG regs[30] | |
175 | #define __PT_FP_REG regs[29] /* Works only with CONFIG_FRAME_POINTER */ | |
176 | #define __PT_RC_REG regs[0] | |
177 | #define __PT_SP_REG sp | |
178 | #define __PT_IP_REG pc | |
6f5d467d | 179 | #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) |
fbca4a2f | 180 | #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ((const struct pt_regs___arm64 *)(x), orig_x0) |
b8ebce86 | 181 | |
3ac4dbe3 AN |
182 | #elif defined(bpf_target_mips) |
183 | ||
3cc31d79 AN |
184 | #define __PT_PARM1_REG regs[4] |
185 | #define __PT_PARM2_REG regs[5] | |
186 | #define __PT_PARM3_REG regs[6] | |
187 | #define __PT_PARM4_REG regs[7] | |
188 | #define __PT_PARM5_REG regs[8] | |
189 | #define __PT_RET_REG regs[31] | |
190 | #define __PT_FP_REG regs[30] /* Works only with CONFIG_FRAME_POINTER */ | |
191 | #define __PT_RC_REG regs[2] | |
192 | #define __PT_SP_REG regs[29] | |
193 | #define __PT_IP_REG cp0_epc | |
b8ebce86 | 194 | |
3ac4dbe3 AN |
195 | #elif defined(bpf_target_powerpc) |
196 | ||
3cc31d79 AN |
197 | #define __PT_PARM1_REG gpr[3] |
198 | #define __PT_PARM2_REG gpr[4] | |
199 | #define __PT_PARM3_REG gpr[5] | |
200 | #define __PT_PARM4_REG gpr[6] | |
201 | #define __PT_PARM5_REG gpr[7] | |
202 | #define __PT_RET_REG regs[31] | |
203 | #define __PT_FP_REG __unsupported__ | |
204 | #define __PT_RC_REG gpr[3] | |
205 | #define __PT_SP_REG sp | |
206 | #define __PT_IP_REG nip | |
f07f1503 IL |
207 | /* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
208 | #define PT_REGS_SYSCALL_REGS(ctx) ctx | |
b8ebce86 | 209 | |
3ac4dbe3 AN |
210 | #elif defined(bpf_target_sparc) |
211 | ||
3cc31d79 AN |
212 | #define __PT_PARM1_REG u_regs[UREG_I0] |
213 | #define __PT_PARM2_REG u_regs[UREG_I1] | |
214 | #define __PT_PARM3_REG u_regs[UREG_I2] | |
215 | #define __PT_PARM4_REG u_regs[UREG_I3] | |
216 | #define __PT_PARM5_REG u_regs[UREG_I4] | |
217 | #define __PT_RET_REG u_regs[UREG_I7] | |
218 | #define __PT_FP_REG __unsupported__ | |
219 | #define __PT_RC_REG u_regs[UREG_I0] | |
220 | #define __PT_SP_REG u_regs[UREG_FP] | |
3ac4dbe3 AN |
221 | /* Should this also be a bpf_target check for the sparc case? */ |
222 | #if defined(__arch64__) | |
3cc31d79 | 223 | #define __PT_IP_REG tpc |
3ac4dbe3 | 224 | #else |
3cc31d79 | 225 | #define __PT_IP_REG pc |
3ac4dbe3 AN |
226 | #endif |
227 | ||
589fed47 BT |
228 | #elif defined(bpf_target_riscv) |
229 | ||
3cc31d79 AN |
230 | #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) |
231 | #define __PT_PARM1_REG a0 | |
232 | #define __PT_PARM2_REG a1 | |
233 | #define __PT_PARM3_REG a2 | |
234 | #define __PT_PARM4_REG a3 | |
235 | #define __PT_PARM5_REG a4 | |
236 | #define __PT_RET_REG ra | |
5c101153 | 237 | #define __PT_FP_REG s0 |
935dc35c | 238 | #define __PT_RC_REG a0 |
3cc31d79 | 239 | #define __PT_SP_REG sp |
5c101153 | 240 | #define __PT_IP_REG pc |
cf0b5b27 IL |
241 | /* riscv does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
242 | #define PT_REGS_SYSCALL_REGS(ctx) ctx | |
3cc31d79 | 243 | |
07385998 VI |
244 | #elif defined(bpf_target_arc) |
245 | ||
246 | /* arc provides struct user_pt_regs instead of struct pt_regs to userspace */ | |
247 | #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) | |
248 | #define __PT_PARM1_REG scratch.r0 | |
249 | #define __PT_PARM2_REG scratch.r1 | |
250 | #define __PT_PARM3_REG scratch.r2 | |
251 | #define __PT_PARM4_REG scratch.r3 | |
252 | #define __PT_PARM5_REG scratch.r4 | |
253 | #define __PT_RET_REG scratch.blink | |
254 | #define __PT_FP_REG __unsupported__ | |
255 | #define __PT_RC_REG scratch.r0 | |
256 | #define __PT_SP_REG scratch.sp | |
257 | #define __PT_IP_REG scratch.ret | |
258 | /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */ | |
259 | #define PT_REGS_SYSCALL_REGS(ctx) ctx | |
260 | ||
3cc31d79 AN |
261 | #endif |
262 | ||
263 | #if defined(bpf_target_defined) | |
264 | ||
589fed47 | 265 | struct pt_regs; |
589fed47 | 266 | |
3cc31d79 AN |
267 | /* allow some architecutres to override `struct pt_regs` */ |
268 | #ifndef __PT_REGS_CAST | |
269 | #define __PT_REGS_CAST(x) (x) | |
3ac4dbe3 AN |
270 | #endif |
271 | ||
3cc31d79 AN |
272 | #define PT_REGS_PARM1(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG) |
273 | #define PT_REGS_PARM2(x) (__PT_REGS_CAST(x)->__PT_PARM2_REG) | |
274 | #define PT_REGS_PARM3(x) (__PT_REGS_CAST(x)->__PT_PARM3_REG) | |
275 | #define PT_REGS_PARM4(x) (__PT_REGS_CAST(x)->__PT_PARM4_REG) | |
276 | #define PT_REGS_PARM5(x) (__PT_REGS_CAST(x)->__PT_PARM5_REG) | |
277 | #define PT_REGS_RET(x) (__PT_REGS_CAST(x)->__PT_RET_REG) | |
278 | #define PT_REGS_FP(x) (__PT_REGS_CAST(x)->__PT_FP_REG) | |
279 | #define PT_REGS_RC(x) (__PT_REGS_CAST(x)->__PT_RC_REG) | |
280 | #define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG) | |
281 | #define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG) | |
282 | ||
283 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_REG) | |
284 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_REG) | |
285 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_REG) | |
286 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_REG) | |
287 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_REG) | |
288 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RET_REG) | |
289 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_FP_REG) | |
290 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RC_REG) | |
291 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_SP_REG) | |
292 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_IP_REG) | |
293 | ||
3ac4dbe3 | 294 | #if defined(bpf_target_powerpc) |
3cc31d79 | 295 | |
3ac4dbe3 AN |
296 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) |
297 | #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP | |
3cc31d79 | 298 | |
3ac4dbe3 | 299 | #elif defined(bpf_target_sparc) |
3cc31d79 | 300 | |
3ac4dbe3 AN |
301 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) |
302 | #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP | |
3cc31d79 AN |
303 | |
304 | #else | |
305 | ||
3ac4dbe3 | 306 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) \ |
70785cfb | 307 | ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) |
3ac4dbe3 | 308 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ |
3cc31d79 AN |
309 | ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) |
310 | ||
3ac4dbe3 AN |
311 | #endif |
312 | ||
60d16c5c | 313 | #ifndef PT_REGS_PARM1_SYSCALL |
d084df3b | 314 | #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1(x) |
60d16c5c | 315 | #endif |
d084df3b KT |
316 | #define PT_REGS_PARM2_SYSCALL(x) PT_REGS_PARM2(x) |
317 | #define PT_REGS_PARM3_SYSCALL(x) PT_REGS_PARM3(x) | |
60d16c5c | 318 | #ifndef PT_REGS_PARM4_SYSCALL |
d084df3b KT |
319 | #define PT_REGS_PARM4_SYSCALL(x) PT_REGS_PARM4(x) |
320 | #endif | |
321 | #define PT_REGS_PARM5_SYSCALL(x) PT_REGS_PARM5(x) | |
322 | ||
60d16c5c | 323 | #ifndef PT_REGS_PARM1_CORE_SYSCALL |
d084df3b | 324 | #define PT_REGS_PARM1_CORE_SYSCALL(x) PT_REGS_PARM1_CORE(x) |
60d16c5c | 325 | #endif |
d084df3b KT |
326 | #define PT_REGS_PARM2_CORE_SYSCALL(x) PT_REGS_PARM2_CORE(x) |
327 | #define PT_REGS_PARM3_CORE_SYSCALL(x) PT_REGS_PARM3_CORE(x) | |
60d16c5c | 328 | #ifndef PT_REGS_PARM4_CORE_SYSCALL |
d084df3b KT |
329 | #define PT_REGS_PARM4_CORE_SYSCALL(x) PT_REGS_PARM4_CORE(x) |
330 | #endif | |
331 | #define PT_REGS_PARM5_CORE_SYSCALL(x) PT_REGS_PARM5_CORE(x) | |
332 | ||
3cc31d79 | 333 | #else /* defined(bpf_target_defined) */ |
4a638d58 LB |
334 | |
335 | #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
336 | #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
337 | #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
338 | #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
339 | #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
340 | #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
341 | #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
342 | #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
343 | #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
344 | #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
345 | ||
346 | #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
347 | #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
348 | #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
349 | #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
350 | #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
351 | #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
352 | #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
353 | #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
354 | #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
355 | #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
356 | ||
357 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
358 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
359 | ||
d084df3b KT |
360 | #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
361 | #define PT_REGS_PARM2_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
362 | #define PT_REGS_PARM3_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
363 | #define PT_REGS_PARM4_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
364 | #define PT_REGS_PARM5_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
365 | ||
366 | #define PT_REGS_PARM1_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
367 | #define PT_REGS_PARM2_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
368 | #define PT_REGS_PARM3_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
369 | #define PT_REGS_PARM4_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
370 | #define PT_REGS_PARM5_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) | |
371 | ||
3cc31d79 | 372 | #endif /* defined(bpf_target_defined) */ |
4a638d58 | 373 | |
c5a1ffa0 IL |
374 | /* |
375 | * When invoked from a syscall handler kprobe, returns a pointer to a | |
376 | * struct pt_regs containing syscall arguments and suitable for passing to | |
377 | * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL(). | |
378 | */ | |
379 | #ifndef PT_REGS_SYSCALL_REGS | |
380 | /* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */ | |
381 | #define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx)) | |
382 | #endif | |
383 | ||
d6a6a555 | 384 | #ifndef ___bpf_concat |
df8ff353 | 385 | #define ___bpf_concat(a, b) a ## b |
d6a6a555 FR |
386 | #endif |
387 | #ifndef ___bpf_apply | |
df8ff353 | 388 | #define ___bpf_apply(fn, n) ___bpf_concat(fn, n) |
d6a6a555 FR |
389 | #endif |
390 | #ifndef ___bpf_nth | |
df8ff353 | 391 | #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N |
d6a6a555 FR |
392 | #endif |
393 | #ifndef ___bpf_narg | |
f60edf5b | 394 | #define ___bpf_narg(...) ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) |
d6a6a555 | 395 | #endif |
df8ff353 | 396 | |
f60edf5b AN |
397 | #define ___bpf_ctx_cast0() ctx |
398 | #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0] | |
399 | #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1] | |
400 | #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2] | |
401 | #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3] | |
402 | #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4] | |
403 | #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5] | |
404 | #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6] | |
405 | #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7] | |
406 | #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8] | |
df8ff353 AN |
407 | #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9] |
408 | #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10] | |
409 | #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11] | |
f60edf5b | 410 | #define ___bpf_ctx_cast(args...) ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) |
df8ff353 AN |
411 | |
412 | /* | |
413 | * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and | |
414 | * similar kinds of BPF programs, that accept input arguments as a single | |
415 | * pointer to untyped u64 array, where each u64 can actually be a typed | |
416 | * pointer or integer of different size. Instead of requring user to write | |
417 | * manual casts and work with array elements by index, BPF_PROG macro | |
418 | * allows user to declare a list of named and typed input arguments in the | |
419 | * same syntax as for normal C function. All the casting is hidden and | |
420 | * performed transparently, while user code can just assume working with | |
421 | * function arguments of specified type and name. | |
422 | * | |
423 | * Original raw context argument is preserved as well as 'ctx' argument. | |
424 | * This is useful when using BPF helpers that expect original context | |
425 | * as one of the parameters (e.g., for bpf_perf_event_output()). | |
426 | */ | |
427 | #define BPF_PROG(name, args...) \ | |
428 | name(unsigned long long *ctx); \ | |
d25f40ff | 429 | static __always_inline typeof(name(0)) \ |
df8ff353 AN |
430 | ____##name(unsigned long long *ctx, ##args); \ |
431 | typeof(name(0)) name(unsigned long long *ctx) \ | |
432 | { \ | |
433 | _Pragma("GCC diagnostic push") \ | |
434 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ | |
435 | return ____##name(___bpf_ctx_cast(args)); \ | |
436 | _Pragma("GCC diagnostic pop") \ | |
437 | } \ | |
d25f40ff | 438 | static __always_inline typeof(name(0)) \ |
df8ff353 AN |
439 | ____##name(unsigned long long *ctx, ##args) |
440 | ||
9f2f5d78 YS |
441 | #ifndef ___bpf_nth2 |
442 | #define ___bpf_nth2(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, \ | |
443 | _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, N, ...) N | |
34586d29 | 444 | #endif |
9f2f5d78 YS |
445 | #ifndef ___bpf_narg2 |
446 | #define ___bpf_narg2(...) \ | |
447 | ___bpf_nth2(_, ##__VA_ARGS__, 12, 12, 11, 11, 10, 10, 9, 9, 8, 8, 7, 7, \ | |
448 | 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0) | |
34586d29 YS |
449 | #endif |
450 | ||
9f2f5d78 YS |
451 | #define ___bpf_treg_cnt(t) \ |
452 | __builtin_choose_expr(sizeof(t) == 1, 1, \ | |
453 | __builtin_choose_expr(sizeof(t) == 2, 1, \ | |
454 | __builtin_choose_expr(sizeof(t) == 4, 1, \ | |
455 | __builtin_choose_expr(sizeof(t) == 8, 1, \ | |
456 | __builtin_choose_expr(sizeof(t) == 16, 2, \ | |
34586d29 YS |
457 | (void)0))))) |
458 | ||
9f2f5d78 YS |
459 | #define ___bpf_reg_cnt0() (0) |
460 | #define ___bpf_reg_cnt1(t, x) (___bpf_reg_cnt0() + ___bpf_treg_cnt(t)) | |
461 | #define ___bpf_reg_cnt2(t, x, args...) (___bpf_reg_cnt1(args) + ___bpf_treg_cnt(t)) | |
462 | #define ___bpf_reg_cnt3(t, x, args...) (___bpf_reg_cnt2(args) + ___bpf_treg_cnt(t)) | |
463 | #define ___bpf_reg_cnt4(t, x, args...) (___bpf_reg_cnt3(args) + ___bpf_treg_cnt(t)) | |
464 | #define ___bpf_reg_cnt5(t, x, args...) (___bpf_reg_cnt4(args) + ___bpf_treg_cnt(t)) | |
465 | #define ___bpf_reg_cnt6(t, x, args...) (___bpf_reg_cnt5(args) + ___bpf_treg_cnt(t)) | |
466 | #define ___bpf_reg_cnt7(t, x, args...) (___bpf_reg_cnt6(args) + ___bpf_treg_cnt(t)) | |
467 | #define ___bpf_reg_cnt8(t, x, args...) (___bpf_reg_cnt7(args) + ___bpf_treg_cnt(t)) | |
468 | #define ___bpf_reg_cnt9(t, x, args...) (___bpf_reg_cnt8(args) + ___bpf_treg_cnt(t)) | |
469 | #define ___bpf_reg_cnt10(t, x, args...) (___bpf_reg_cnt9(args) + ___bpf_treg_cnt(t)) | |
470 | #define ___bpf_reg_cnt11(t, x, args...) (___bpf_reg_cnt10(args) + ___bpf_treg_cnt(t)) | |
471 | #define ___bpf_reg_cnt12(t, x, args...) (___bpf_reg_cnt11(args) + ___bpf_treg_cnt(t)) | |
472 | #define ___bpf_reg_cnt(args...) ___bpf_apply(___bpf_reg_cnt, ___bpf_narg2(args))(args) | |
473 | ||
474 | #define ___bpf_union_arg(t, x, n) \ | |
475 | __builtin_choose_expr(sizeof(t) == 1, ({ union { __u8 z[1]; t x; } ___t = { .z = {ctx[n]}}; ___t.x; }), \ | |
476 | __builtin_choose_expr(sizeof(t) == 2, ({ union { __u16 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ | |
477 | __builtin_choose_expr(sizeof(t) == 4, ({ union { __u32 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ | |
478 | __builtin_choose_expr(sizeof(t) == 8, ({ union { __u64 z[1]; t x; } ___t = {.z = {ctx[n]} }; ___t.x; }), \ | |
479 | __builtin_choose_expr(sizeof(t) == 16, ({ union { __u64 z[2]; t x; } ___t = {.z = {ctx[n], ctx[n + 1]} }; ___t.x; }), \ | |
480 | (void)0))))) | |
481 | ||
482 | #define ___bpf_ctx_arg0(n, args...) | |
483 | #define ___bpf_ctx_arg1(n, t, x) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt1(t, x)) | |
484 | #define ___bpf_ctx_arg2(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt2(t, x, args)) ___bpf_ctx_arg1(n, args) | |
485 | #define ___bpf_ctx_arg3(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt3(t, x, args)) ___bpf_ctx_arg2(n, args) | |
486 | #define ___bpf_ctx_arg4(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt4(t, x, args)) ___bpf_ctx_arg3(n, args) | |
487 | #define ___bpf_ctx_arg5(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt5(t, x, args)) ___bpf_ctx_arg4(n, args) | |
488 | #define ___bpf_ctx_arg6(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt6(t, x, args)) ___bpf_ctx_arg5(n, args) | |
489 | #define ___bpf_ctx_arg7(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt7(t, x, args)) ___bpf_ctx_arg6(n, args) | |
490 | #define ___bpf_ctx_arg8(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt8(t, x, args)) ___bpf_ctx_arg7(n, args) | |
491 | #define ___bpf_ctx_arg9(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt9(t, x, args)) ___bpf_ctx_arg8(n, args) | |
492 | #define ___bpf_ctx_arg10(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt10(t, x, args)) ___bpf_ctx_arg9(n, args) | |
493 | #define ___bpf_ctx_arg11(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt11(t, x, args)) ___bpf_ctx_arg10(n, args) | |
494 | #define ___bpf_ctx_arg12(n, t, x, args...) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt12(t, x, args)) ___bpf_ctx_arg11(n, args) | |
495 | #define ___bpf_ctx_arg(args...) ___bpf_apply(___bpf_ctx_arg, ___bpf_narg2(args))(___bpf_reg_cnt(args), args) | |
496 | ||
497 | #define ___bpf_ctx_decl0() | |
498 | #define ___bpf_ctx_decl1(t, x) , t x | |
499 | #define ___bpf_ctx_decl2(t, x, args...) , t x ___bpf_ctx_decl1(args) | |
500 | #define ___bpf_ctx_decl3(t, x, args...) , t x ___bpf_ctx_decl2(args) | |
501 | #define ___bpf_ctx_decl4(t, x, args...) , t x ___bpf_ctx_decl3(args) | |
502 | #define ___bpf_ctx_decl5(t, x, args...) , t x ___bpf_ctx_decl4(args) | |
503 | #define ___bpf_ctx_decl6(t, x, args...) , t x ___bpf_ctx_decl5(args) | |
504 | #define ___bpf_ctx_decl7(t, x, args...) , t x ___bpf_ctx_decl6(args) | |
505 | #define ___bpf_ctx_decl8(t, x, args...) , t x ___bpf_ctx_decl7(args) | |
506 | #define ___bpf_ctx_decl9(t, x, args...) , t x ___bpf_ctx_decl8(args) | |
507 | #define ___bpf_ctx_decl10(t, x, args...) , t x ___bpf_ctx_decl9(args) | |
508 | #define ___bpf_ctx_decl11(t, x, args...) , t x ___bpf_ctx_decl10(args) | |
509 | #define ___bpf_ctx_decl12(t, x, args...) , t x ___bpf_ctx_decl11(args) | |
510 | #define ___bpf_ctx_decl(args...) ___bpf_apply(___bpf_ctx_decl, ___bpf_narg2(args))(args) | |
34586d29 YS |
511 | |
512 | /* | |
9f2f5d78 YS |
513 | * BPF_PROG2 is an enhanced version of BPF_PROG in order to handle struct |
514 | * arguments. Since each struct argument might take one or two u64 values | |
515 | * in the trampoline stack, argument type size is needed to place proper number | |
516 | * of u64 values for each argument. Therefore, BPF_PROG2 has different | |
517 | * syntax from BPF_PROG. For example, for the following BPF_PROG syntax: | |
518 | * | |
519 | * int BPF_PROG(test2, int a, int b) { ... } | |
520 | * | |
521 | * the corresponding BPF_PROG2 syntax is: | |
522 | * | |
523 | * int BPF_PROG2(test2, int, a, int, b) { ... } | |
524 | * | |
525 | * where type and the corresponding argument name are separated by comma. | |
526 | * | |
527 | * Use BPF_PROG2 macro if one of the arguments might be a struct/union larger | |
528 | * than 8 bytes: | |
529 | * | |
530 | * int BPF_PROG2(test_struct_arg, struct bpf_testmod_struct_arg_1, a, int, b, | |
531 | * int, c, int, d, struct bpf_testmod_struct_arg_2, e, int, ret) | |
532 | * { | |
533 | * // access a, b, c, d, e, and ret directly | |
534 | * ... | |
535 | * } | |
34586d29 YS |
536 | */ |
537 | #define BPF_PROG2(name, args...) \ | |
538 | name(unsigned long long *ctx); \ | |
539 | static __always_inline typeof(name(0)) \ | |
9f2f5d78 | 540 | ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)); \ |
34586d29 YS |
541 | typeof(name(0)) name(unsigned long long *ctx) \ |
542 | { \ | |
9f2f5d78 | 543 | return ____##name(ctx ___bpf_ctx_arg(args)); \ |
34586d29 YS |
544 | } \ |
545 | static __always_inline typeof(name(0)) \ | |
9f2f5d78 | 546 | ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)) |
34586d29 | 547 | |
df8ff353 AN |
548 | struct pt_regs; |
549 | ||
f60edf5b AN |
550 | #define ___bpf_kprobe_args0() ctx |
551 | #define ___bpf_kprobe_args1(x) ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx) | |
552 | #define ___bpf_kprobe_args2(x, args...) ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx) | |
553 | #define ___bpf_kprobe_args3(x, args...) ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx) | |
554 | #define ___bpf_kprobe_args4(x, args...) ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx) | |
555 | #define ___bpf_kprobe_args5(x, args...) ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx) | |
556 | #define ___bpf_kprobe_args(args...) ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args) | |
df8ff353 AN |
557 | |
558 | /* | |
559 | * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for | |
560 | * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific | |
561 | * low-level way of getting kprobe input arguments from struct pt_regs, and | |
562 | * provides a familiar typed and named function arguments syntax and | |
563 | * semantics of accessing kprobe input paremeters. | |
564 | * | |
565 | * Original struct pt_regs* context is preserved as 'ctx' argument. This might | |
566 | * be necessary when using BPF helpers like bpf_perf_event_output(). | |
567 | */ | |
568 | #define BPF_KPROBE(name, args...) \ | |
569 | name(struct pt_regs *ctx); \ | |
d25f40ff | 570 | static __always_inline typeof(name(0)) \ |
df8ff353 AN |
571 | ____##name(struct pt_regs *ctx, ##args); \ |
572 | typeof(name(0)) name(struct pt_regs *ctx) \ | |
573 | { \ | |
574 | _Pragma("GCC diagnostic push") \ | |
575 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ | |
576 | return ____##name(___bpf_kprobe_args(args)); \ | |
577 | _Pragma("GCC diagnostic pop") \ | |
578 | } \ | |
d25f40ff | 579 | static __always_inline typeof(name(0)) \ |
df8ff353 AN |
580 | ____##name(struct pt_regs *ctx, ##args) |
581 | ||
f60edf5b AN |
582 | #define ___bpf_kretprobe_args0() ctx |
583 | #define ___bpf_kretprobe_args1(x) ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx) | |
584 | #define ___bpf_kretprobe_args(args...) ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args) | |
df8ff353 AN |
585 | |
586 | /* | |
587 | * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional | |
588 | * return value (in addition to `struct pt_regs *ctx`), but no input | |
589 | * arguments, because they will be clobbered by the time probed function | |
590 | * returns. | |
591 | */ | |
592 | #define BPF_KRETPROBE(name, args...) \ | |
593 | name(struct pt_regs *ctx); \ | |
d25f40ff | 594 | static __always_inline typeof(name(0)) \ |
df8ff353 AN |
595 | ____##name(struct pt_regs *ctx, ##args); \ |
596 | typeof(name(0)) name(struct pt_regs *ctx) \ | |
597 | { \ | |
598 | _Pragma("GCC diagnostic push") \ | |
599 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ | |
600 | return ____##name(___bpf_kretprobe_args(args)); \ | |
601 | _Pragma("GCC diagnostic pop") \ | |
602 | } \ | |
603 | static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) | |
604 | ||
6f5d467d | 605 | /* If kernel has CONFIG_ARCH_HAS_SYSCALL_WRAPPER, read pt_regs directly */ |
816ae109 | 606 | #define ___bpf_syscall_args0() ctx |
6f5d467d AN |
607 | #define ___bpf_syscall_args1(x) ___bpf_syscall_args0(), (void *)PT_REGS_PARM1_SYSCALL(regs) |
608 | #define ___bpf_syscall_args2(x, args...) ___bpf_syscall_args1(args), (void *)PT_REGS_PARM2_SYSCALL(regs) | |
609 | #define ___bpf_syscall_args3(x, args...) ___bpf_syscall_args2(args), (void *)PT_REGS_PARM3_SYSCALL(regs) | |
610 | #define ___bpf_syscall_args4(x, args...) ___bpf_syscall_args3(args), (void *)PT_REGS_PARM4_SYSCALL(regs) | |
611 | #define ___bpf_syscall_args5(x, args...) ___bpf_syscall_args4(args), (void *)PT_REGS_PARM5_SYSCALL(regs) | |
816ae109 HC |
612 | #define ___bpf_syscall_args(args...) ___bpf_apply(___bpf_syscall_args, ___bpf_narg(args))(args) |
613 | ||
6f5d467d AN |
614 | /* If kernel doesn't have CONFIG_ARCH_HAS_SYSCALL_WRAPPER, we have to BPF_CORE_READ from pt_regs */ |
615 | #define ___bpf_syswrap_args0() ctx | |
616 | #define ___bpf_syswrap_args1(x) ___bpf_syswrap_args0(), (void *)PT_REGS_PARM1_CORE_SYSCALL(regs) | |
617 | #define ___bpf_syswrap_args2(x, args...) ___bpf_syswrap_args1(args), (void *)PT_REGS_PARM2_CORE_SYSCALL(regs) | |
618 | #define ___bpf_syswrap_args3(x, args...) ___bpf_syswrap_args2(args), (void *)PT_REGS_PARM3_CORE_SYSCALL(regs) | |
619 | #define ___bpf_syswrap_args4(x, args...) ___bpf_syswrap_args3(args), (void *)PT_REGS_PARM4_CORE_SYSCALL(regs) | |
620 | #define ___bpf_syswrap_args5(x, args...) ___bpf_syswrap_args4(args), (void *)PT_REGS_PARM5_CORE_SYSCALL(regs) | |
621 | #define ___bpf_syswrap_args(args...) ___bpf_apply(___bpf_syswrap_args, ___bpf_narg(args))(args) | |
622 | ||
816ae109 | 623 | /* |
6f5d467d | 624 | * BPF_KSYSCALL is a variant of BPF_KPROBE, which is intended for |
816ae109 HC |
625 | * tracing syscall functions, like __x64_sys_close. It hides the underlying |
626 | * platform-specific low-level way of getting syscall input arguments from | |
627 | * struct pt_regs, and provides a familiar typed and named function arguments | |
628 | * syntax and semantics of accessing syscall input parameters. | |
629 | * | |
6f5d467d | 630 | * Original struct pt_regs * context is preserved as 'ctx' argument. This might |
816ae109 HC |
631 | * be necessary when using BPF helpers like bpf_perf_event_output(). |
632 | * | |
2d369b4b IL |
633 | * At the moment BPF_KSYSCALL does not transparently handle all the calling |
634 | * convention quirks for the following syscalls: | |
635 | * | |
636 | * - mmap(): __ARCH_WANT_SYS_OLD_MMAP. | |
637 | * - clone(): CONFIG_CLONE_BACKWARDS, CONFIG_CLONE_BACKWARDS2 and | |
638 | * CONFIG_CLONE_BACKWARDS3. | |
639 | * - socket-related syscalls: __ARCH_WANT_SYS_SOCKETCALL. | |
640 | * - compat syscalls. | |
641 | * | |
642 | * This may or may not change in the future. User needs to take extra measures | |
643 | * to handle such quirks explicitly, if necessary. | |
6f5d467d AN |
644 | * |
645 | * This macro relies on BPF CO-RE support and virtual __kconfig externs. | |
816ae109 | 646 | */ |
6f5d467d | 647 | #define BPF_KSYSCALL(name, args...) \ |
816ae109 | 648 | name(struct pt_regs *ctx); \ |
6f5d467d | 649 | extern _Bool LINUX_HAS_SYSCALL_WRAPPER __kconfig; \ |
d25f40ff | 650 | static __always_inline typeof(name(0)) \ |
816ae109 HC |
651 | ____##name(struct pt_regs *ctx, ##args); \ |
652 | typeof(name(0)) name(struct pt_regs *ctx) \ | |
653 | { \ | |
6f5d467d AN |
654 | struct pt_regs *regs = LINUX_HAS_SYSCALL_WRAPPER \ |
655 | ? (struct pt_regs *)PT_REGS_PARM1(ctx) \ | |
656 | : ctx; \ | |
816ae109 HC |
657 | _Pragma("GCC diagnostic push") \ |
658 | _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ | |
6f5d467d AN |
659 | if (LINUX_HAS_SYSCALL_WRAPPER) \ |
660 | return ____##name(___bpf_syswrap_args(args)); \ | |
661 | else \ | |
662 | return ____##name(___bpf_syscall_args(args)); \ | |
816ae109 HC |
663 | _Pragma("GCC diagnostic pop") \ |
664 | } \ | |
d25f40ff | 665 | static __always_inline typeof(name(0)) \ |
816ae109 HC |
666 | ____##name(struct pt_regs *ctx, ##args) |
667 | ||
6f5d467d AN |
668 | #define BPF_KPROBE_SYSCALL BPF_KSYSCALL |
669 | ||
3ac4dbe3 | 670 | #endif |