1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 #ifndef __BPF_TRACING_H__ 3 #define __BPF_TRACING_H__ 4 5 /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ 6 #if defined(__TARGET_ARCH_x86) 7 #define bpf_target_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 #else 28 #undef bpf_target_defined 29 #endif 30 31 /* Fall back to what the compiler says */ 32 #ifndef bpf_target_defined 33 #if defined(__x86_64__) 34 #define bpf_target_x86 35 #elif defined(__s390__) 36 #define bpf_target_s390 37 #elif defined(__arm__) 38 #define bpf_target_arm 39 #elif defined(__aarch64__) 40 #define bpf_target_arm64 41 #elif defined(__mips__) 42 #define bpf_target_mips 43 #elif defined(__powerpc__) 44 #define bpf_target_powerpc 45 #elif defined(__sparc__) 46 #define bpf_target_sparc 47 #endif 48 #endif 49 50 #if defined(bpf_target_x86) 51 52 #if defined(__KERNEL__) || defined(__VMLINUX_H__) 53 54 #define PT_REGS_PARM1(x) ((x)->di) 55 #define PT_REGS_PARM2(x) ((x)->si) 56 #define PT_REGS_PARM3(x) ((x)->dx) 57 #define PT_REGS_PARM4(x) ((x)->cx) 58 #define PT_REGS_PARM5(x) ((x)->r8) 59 #define PT_REGS_RET(x) ((x)->sp) 60 #define PT_REGS_FP(x) ((x)->bp) 61 #define PT_REGS_RC(x) ((x)->ax) 62 #define PT_REGS_SP(x) ((x)->sp) 63 #define PT_REGS_IP(x) ((x)->ip) 64 65 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), di) 66 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), si) 67 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), dx) 68 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), cx) 69 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8) 70 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), sp) 71 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), bp) 72 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), ax) 73 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp) 74 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), ip) 75 76 #else 77 78 #ifdef __i386__ 79 /* i386 kernel is built with -mregparm=3 */ 80 #define PT_REGS_PARM1(x) ((x)->eax) 81 #define PT_REGS_PARM2(x) ((x)->edx) 82 #define PT_REGS_PARM3(x) ((x)->ecx) 83 #define PT_REGS_PARM4(x) 0 84 #define PT_REGS_PARM5(x) 0 85 #define PT_REGS_RET(x) ((x)->esp) 86 #define PT_REGS_FP(x) ((x)->ebp) 87 #define PT_REGS_RC(x) ((x)->eax) 88 #define PT_REGS_SP(x) ((x)->esp) 89 #define PT_REGS_IP(x) ((x)->eip) 90 91 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), eax) 92 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), edx) 93 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), ecx) 94 #define PT_REGS_PARM4_CORE(x) 0 95 #define PT_REGS_PARM5_CORE(x) 0 96 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), esp) 97 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), ebp) 98 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), eax) 99 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), esp) 100 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), eip) 101 102 #else 103 104 #define PT_REGS_PARM1(x) ((x)->rdi) 105 #define PT_REGS_PARM2(x) ((x)->rsi) 106 #define PT_REGS_PARM3(x) ((x)->rdx) 107 #define PT_REGS_PARM4(x) ((x)->rcx) 108 #define PT_REGS_PARM5(x) ((x)->r8) 109 #define PT_REGS_RET(x) ((x)->rsp) 110 #define PT_REGS_FP(x) ((x)->rbp) 111 #define PT_REGS_RC(x) ((x)->rax) 112 #define PT_REGS_SP(x) ((x)->rsp) 113 #define PT_REGS_IP(x) ((x)->rip) 114 115 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), rdi) 116 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), rsi) 117 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), rdx) 118 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), rcx) 119 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8) 120 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), rsp) 121 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), rbp) 122 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), rax) 123 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), rsp) 124 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), rip) 125 126 #endif 127 #endif 128 129 #elif defined(bpf_target_s390) 130 131 /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ 132 struct pt_regs; 133 #define PT_REGS_S390 const volatile user_pt_regs 134 #define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2]) 135 #define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3]) 136 #define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4]) 137 #define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5]) 138 #define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6]) 139 #define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14]) 140 /* Works only with CONFIG_FRAME_POINTER */ 141 #define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11]) 142 #define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2]) 143 #define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15]) 144 #define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr) 145 146 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2]) 147 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[3]) 148 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[4]) 149 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[5]) 150 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[6]) 151 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), grps[14]) 152 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[11]) 153 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2]) 154 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[15]) 155 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), pdw.addr) 156 157 #elif defined(bpf_target_arm) 158 159 #define PT_REGS_PARM1(x) ((x)->uregs[0]) 160 #define PT_REGS_PARM2(x) ((x)->uregs[1]) 161 #define PT_REGS_PARM3(x) ((x)->uregs[2]) 162 #define PT_REGS_PARM4(x) ((x)->uregs[3]) 163 #define PT_REGS_PARM5(x) ((x)->uregs[4]) 164 #define PT_REGS_RET(x) ((x)->uregs[14]) 165 #define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */ 166 #define PT_REGS_RC(x) ((x)->uregs[0]) 167 #define PT_REGS_SP(x) ((x)->uregs[13]) 168 #define PT_REGS_IP(x) ((x)->uregs[12]) 169 170 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), uregs[0]) 171 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), uregs[1]) 172 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), uregs[2]) 173 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), uregs[3]) 174 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), uregs[4]) 175 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), uregs[14]) 176 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), uregs[11]) 177 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), uregs[0]) 178 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), uregs[13]) 179 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), uregs[12]) 180 181 #elif defined(bpf_target_arm64) 182 183 /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ 184 struct pt_regs; 185 #define PT_REGS_ARM64 const volatile struct user_pt_regs 186 #define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0]) 187 #define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1]) 188 #define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2]) 189 #define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3]) 190 #define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4]) 191 #define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30]) 192 /* Works only with CONFIG_FRAME_POINTER */ 193 #define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29]) 194 #define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0]) 195 #define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp) 196 #define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc) 197 198 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0]) 199 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[1]) 200 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[2]) 201 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[3]) 202 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[4]) 203 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[30]) 204 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[29]) 205 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0]) 206 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), sp) 207 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), pc) 208 209 #elif defined(bpf_target_mips) 210 211 #define PT_REGS_PARM1(x) ((x)->regs[4]) 212 #define PT_REGS_PARM2(x) ((x)->regs[5]) 213 #define PT_REGS_PARM3(x) ((x)->regs[6]) 214 #define PT_REGS_PARM4(x) ((x)->regs[7]) 215 #define PT_REGS_PARM5(x) ((x)->regs[8]) 216 #define PT_REGS_RET(x) ((x)->regs[31]) 217 #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ 218 #define PT_REGS_RC(x) ((x)->regs[1]) 219 #define PT_REGS_SP(x) ((x)->regs[29]) 220 #define PT_REGS_IP(x) ((x)->cp0_epc) 221 222 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), regs[4]) 223 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), regs[5]) 224 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), regs[6]) 225 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), regs[7]) 226 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8]) 227 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31]) 228 #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30]) 229 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[1]) 230 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29]) 231 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc) 232 233 #elif defined(bpf_target_powerpc) 234 235 #define PT_REGS_PARM1(x) ((x)->gpr[3]) 236 #define PT_REGS_PARM2(x) ((x)->gpr[4]) 237 #define PT_REGS_PARM3(x) ((x)->gpr[5]) 238 #define PT_REGS_PARM4(x) ((x)->gpr[6]) 239 #define PT_REGS_PARM5(x) ((x)->gpr[7]) 240 #define PT_REGS_RC(x) ((x)->gpr[3]) 241 #define PT_REGS_SP(x) ((x)->sp) 242 #define PT_REGS_IP(x) ((x)->nip) 243 244 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), gpr[3]) 245 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), gpr[4]) 246 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), gpr[5]) 247 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), gpr[6]) 248 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), gpr[7]) 249 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), gpr[3]) 250 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp) 251 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), nip) 252 253 #elif defined(bpf_target_sparc) 254 255 #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0]) 256 #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1]) 257 #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2]) 258 #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3]) 259 #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4]) 260 #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7]) 261 #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0]) 262 #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP]) 263 264 #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0]) 265 #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I1]) 266 #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I2]) 267 #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I3]) 268 #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I4]) 269 #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I7]) 270 #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0]) 271 #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), u_regs[UREG_FP]) 272 273 /* Should this also be a bpf_target check for the sparc case? */ 274 #if defined(__arch64__) 275 #define PT_REGS_IP(x) ((x)->tpc) 276 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), tpc) 277 #else 278 #define PT_REGS_IP(x) ((x)->pc) 279 #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), pc) 280 #endif 281 282 #endif 283 284 #if defined(bpf_target_powerpc) 285 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) 286 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP 287 #elif defined(bpf_target_sparc) 288 #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) 289 #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP 290 #else 291 #define BPF_KPROBE_READ_RET_IP(ip, ctx) \ 292 ({ bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) 293 #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ 294 ({ bpf_probe_read(&(ip), sizeof(ip), \ 295 (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) 296 #endif 297 298 #define ___bpf_concat(a, b) a ## b 299 #define ___bpf_apply(fn, n) ___bpf_concat(fn, n) 300 #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N 301 #define ___bpf_narg(...) \ 302 ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) 303 #define ___bpf_empty(...) \ 304 ___bpf_nth(_, ##__VA_ARGS__, N, N, N, N, N, N, N, N, N, N, 0) 305 306 #define ___bpf_ctx_cast0() ctx 307 #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0] 308 #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1] 309 #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2] 310 #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3] 311 #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4] 312 #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5] 313 #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6] 314 #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7] 315 #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8] 316 #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9] 317 #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10] 318 #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11] 319 #define ___bpf_ctx_cast(args...) \ 320 ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) 321 322 /* 323 * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and 324 * similar kinds of BPF programs, that accept input arguments as a single 325 * pointer to untyped u64 array, where each u64 can actually be a typed 326 * pointer or integer of different size. Instead of requring user to write 327 * manual casts and work with array elements by index, BPF_PROG macro 328 * allows user to declare a list of named and typed input arguments in the 329 * same syntax as for normal C function. All the casting is hidden and 330 * performed transparently, while user code can just assume working with 331 * function arguments of specified type and name. 332 * 333 * Original raw context argument is preserved as well as 'ctx' argument. 334 * This is useful when using BPF helpers that expect original context 335 * as one of the parameters (e.g., for bpf_perf_event_output()). 336 */ 337 #define BPF_PROG(name, args...) \ 338 name(unsigned long long *ctx); \ 339 static __attribute__((always_inline)) typeof(name(0)) \ 340 ____##name(unsigned long long *ctx, ##args); \ 341 typeof(name(0)) name(unsigned long long *ctx) \ 342 { \ 343 _Pragma("GCC diagnostic push") \ 344 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 345 return ____##name(___bpf_ctx_cast(args)); \ 346 _Pragma("GCC diagnostic pop") \ 347 } \ 348 static __attribute__((always_inline)) typeof(name(0)) \ 349 ____##name(unsigned long long *ctx, ##args) 350 351 struct pt_regs; 352 353 #define ___bpf_kprobe_args0() ctx 354 #define ___bpf_kprobe_args1(x) \ 355 ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx) 356 #define ___bpf_kprobe_args2(x, args...) \ 357 ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx) 358 #define ___bpf_kprobe_args3(x, args...) \ 359 ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx) 360 #define ___bpf_kprobe_args4(x, args...) \ 361 ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx) 362 #define ___bpf_kprobe_args5(x, args...) \ 363 ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx) 364 #define ___bpf_kprobe_args(args...) \ 365 ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args) 366 367 /* 368 * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for 369 * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific 370 * low-level way of getting kprobe input arguments from struct pt_regs, and 371 * provides a familiar typed and named function arguments syntax and 372 * semantics of accessing kprobe input paremeters. 373 * 374 * Original struct pt_regs* context is preserved as 'ctx' argument. This might 375 * be necessary when using BPF helpers like bpf_perf_event_output(). 376 */ 377 #define BPF_KPROBE(name, args...) \ 378 name(struct pt_regs *ctx); \ 379 static __attribute__((always_inline)) typeof(name(0)) \ 380 ____##name(struct pt_regs *ctx, ##args); \ 381 typeof(name(0)) name(struct pt_regs *ctx) \ 382 { \ 383 _Pragma("GCC diagnostic push") \ 384 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 385 return ____##name(___bpf_kprobe_args(args)); \ 386 _Pragma("GCC diagnostic pop") \ 387 } \ 388 static __attribute__((always_inline)) typeof(name(0)) \ 389 ____##name(struct pt_regs *ctx, ##args) 390 391 #define ___bpf_kretprobe_args0() ctx 392 #define ___bpf_kretprobe_args1(x) \ 393 ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx) 394 #define ___bpf_kretprobe_args(args...) \ 395 ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args) 396 397 /* 398 * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional 399 * return value (in addition to `struct pt_regs *ctx`), but no input 400 * arguments, because they will be clobbered by the time probed function 401 * returns. 402 */ 403 #define BPF_KRETPROBE(name, args...) \ 404 name(struct pt_regs *ctx); \ 405 static __attribute__((always_inline)) typeof(name(0)) \ 406 ____##name(struct pt_regs *ctx, ##args); \ 407 typeof(name(0)) name(struct pt_regs *ctx) \ 408 { \ 409 _Pragma("GCC diagnostic push") \ 410 _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ 411 return ____##name(___bpf_kretprobe_args(args)); \ 412 _Pragma("GCC diagnostic pop") \ 413 } \ 414 static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) 415 416 #endif 417