| /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
| #ifndef __BPF_TRACING_H__ |
| #define __BPF_TRACING_H__ |
| |
| #include <bpf/bpf_helpers.h> |
| |
| /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ |
| #if defined(__TARGET_ARCH_x86) |
| #define bpf_target_x86 |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_s390) |
| #define bpf_target_s390 |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_arm) |
| #define bpf_target_arm |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_arm64) |
| #define bpf_target_arm64 |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_mips) |
| #define bpf_target_mips |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_powerpc) |
| #define bpf_target_powerpc |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_sparc) |
| #define bpf_target_sparc |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_riscv) |
| #define bpf_target_riscv |
| #define bpf_target_defined |
| #elif defined(__TARGET_ARCH_arc) |
| #define bpf_target_arc |
| #define bpf_target_defined |
| #else |
| |
| /* Fall back to what the compiler says */ |
| #if defined(__x86_64__) |
| #define bpf_target_x86 |
| #define bpf_target_defined |
| #elif defined(__s390__) |
| #define bpf_target_s390 |
| #define bpf_target_defined |
| #elif defined(__arm__) |
| #define bpf_target_arm |
| #define bpf_target_defined |
| #elif defined(__aarch64__) |
| #define bpf_target_arm64 |
| #define bpf_target_defined |
| #elif defined(__mips__) |
| #define bpf_target_mips |
| #define bpf_target_defined |
| #elif defined(__powerpc__) |
| #define bpf_target_powerpc |
| #define bpf_target_defined |
| #elif defined(__sparc__) |
| #define bpf_target_sparc |
| #define bpf_target_defined |
| #elif defined(__riscv) && __riscv_xlen == 64 |
| #define bpf_target_riscv |
| #define bpf_target_defined |
| #elif defined(__arc__) |
| #define bpf_target_arc |
| #define bpf_target_defined |
| #endif /* no compiler target */ |
| |
| #endif |
| |
| #ifndef __BPF_TARGET_MISSING |
| #define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\"" |
| #endif |
| |
| #if defined(bpf_target_x86) |
| |
| #if defined(__KERNEL__) || defined(__VMLINUX_H__) |
| |
| #define __PT_PARM1_REG di |
| #define __PT_PARM2_REG si |
| #define __PT_PARM3_REG dx |
| #define __PT_PARM4_REG cx |
| #define __PT_PARM5_REG r8 |
| #define __PT_RET_REG sp |
| #define __PT_FP_REG bp |
| #define __PT_RC_REG ax |
| #define __PT_SP_REG sp |
| #define __PT_IP_REG ip |
| /* syscall uses r10 for PARM4 */ |
| #define PT_REGS_PARM4_SYSCALL(x) ((x)->r10) |
| #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10) |
| |
| #else |
| |
| #ifdef __i386__ |
| |
| #define __PT_PARM1_REG eax |
| #define __PT_PARM2_REG edx |
| #define __PT_PARM3_REG ecx |
| /* i386 kernel is built with -mregparm=3 */ |
| #define __PT_PARM4_REG __unsupported__ |
| #define __PT_PARM5_REG __unsupported__ |
| #define __PT_RET_REG esp |
| #define __PT_FP_REG ebp |
| #define __PT_RC_REG eax |
| #define __PT_SP_REG esp |
| #define __PT_IP_REG eip |
| |
| #else /* __i386__ */ |
| |
| #define __PT_PARM1_REG rdi |
| #define __PT_PARM2_REG rsi |
| #define __PT_PARM3_REG rdx |
| #define __PT_PARM4_REG rcx |
| #define __PT_PARM5_REG r8 |
| #define __PT_RET_REG rsp |
| #define __PT_FP_REG rbp |
| #define __PT_RC_REG rax |
| #define __PT_SP_REG rsp |
| #define __PT_IP_REG rip |
| /* syscall uses r10 for PARM4 */ |
| #define PT_REGS_PARM4_SYSCALL(x) ((x)->r10) |
| #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(x, r10) |
| |
| #endif /* __i386__ */ |
| |
| #endif /* __KERNEL__ || __VMLINUX_H__ */ |
| |
| #elif defined(bpf_target_s390) |
| |
| struct pt_regs___s390 { |
| unsigned long orig_gpr2; |
| }; |
| |
| /* s390 provides user_pt_regs instead of struct pt_regs to userspace */ |
| #define __PT_REGS_CAST(x) ((const user_pt_regs *)(x)) |
| #define __PT_PARM1_REG gprs[2] |
| #define __PT_PARM2_REG gprs[3] |
| #define __PT_PARM3_REG gprs[4] |
| #define __PT_PARM4_REG gprs[5] |
| #define __PT_PARM5_REG gprs[6] |
| #define __PT_RET_REG grps[14] |
| #define __PT_FP_REG gprs[11] /* Works only with CONFIG_FRAME_POINTER */ |
| #define __PT_RC_REG gprs[2] |
| #define __PT_SP_REG gprs[15] |
| #define __PT_IP_REG psw.addr |
| #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) |
| #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ((const struct pt_regs___s390 *)(x), orig_gpr2) |
| |
| #elif defined(bpf_target_arm) |
| |
| #define __PT_PARM1_REG uregs[0] |
| #define __PT_PARM2_REG uregs[1] |
| #define __PT_PARM3_REG uregs[2] |
| #define __PT_PARM4_REG uregs[3] |
| #define __PT_PARM5_REG uregs[4] |
| #define __PT_RET_REG uregs[14] |
| #define __PT_FP_REG uregs[11] /* Works only with CONFIG_FRAME_POINTER */ |
| #define __PT_RC_REG uregs[0] |
| #define __PT_SP_REG uregs[13] |
| #define __PT_IP_REG uregs[12] |
| |
| #elif defined(bpf_target_arm64) |
| |
| struct pt_regs___arm64 { |
| unsigned long orig_x0; |
| }; |
| |
| /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ |
| #define __PT_REGS_CAST(x) ((const struct user_pt_regs *)(x)) |
| #define __PT_PARM1_REG regs[0] |
| #define __PT_PARM2_REG regs[1] |
| #define __PT_PARM3_REG regs[2] |
| #define __PT_PARM4_REG regs[3] |
| #define __PT_PARM5_REG regs[4] |
| #define __PT_RET_REG regs[30] |
| #define __PT_FP_REG regs[29] /* Works only with CONFIG_FRAME_POINTER */ |
| #define __PT_RC_REG regs[0] |
| #define __PT_SP_REG sp |
| #define __PT_IP_REG pc |
| #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1_CORE_SYSCALL(x) |
| #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ((const struct pt_regs___arm64 *)(x), orig_x0) |
| |
| #elif defined(bpf_target_mips) |
| |
| #define __PT_PARM1_REG regs[4] |
| #define __PT_PARM2_REG regs[5] |
| #define __PT_PARM3_REG regs[6] |
| #define __PT_PARM4_REG regs[7] |
| #define __PT_PARM5_REG regs[8] |
| #define __PT_RET_REG regs[31] |
| #define __PT_FP_REG regs[30] /* Works only with CONFIG_FRAME_POINTER */ |
| #define __PT_RC_REG regs[2] |
| #define __PT_SP_REG regs[29] |
| #define __PT_IP_REG cp0_epc |
| |
| #elif defined(bpf_target_powerpc) |
| |
| #define __PT_PARM1_REG gpr[3] |
| #define __PT_PARM2_REG gpr[4] |
| #define __PT_PARM3_REG gpr[5] |
| #define __PT_PARM4_REG gpr[6] |
| #define __PT_PARM5_REG gpr[7] |
| #define __PT_RET_REG regs[31] |
| #define __PT_FP_REG __unsupported__ |
| #define __PT_RC_REG gpr[3] |
| #define __PT_SP_REG sp |
| #define __PT_IP_REG nip |
| /* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
| #define PT_REGS_SYSCALL_REGS(ctx) ctx |
| |
| #elif defined(bpf_target_sparc) |
| |
| #define __PT_PARM1_REG u_regs[UREG_I0] |
| #define __PT_PARM2_REG u_regs[UREG_I1] |
| #define __PT_PARM3_REG u_regs[UREG_I2] |
| #define __PT_PARM4_REG u_regs[UREG_I3] |
| #define __PT_PARM5_REG u_regs[UREG_I4] |
| #define __PT_RET_REG u_regs[UREG_I7] |
| #define __PT_FP_REG __unsupported__ |
| #define __PT_RC_REG u_regs[UREG_I0] |
| #define __PT_SP_REG u_regs[UREG_FP] |
| /* Should this also be a bpf_target check for the sparc case? */ |
| #if defined(__arch64__) |
| #define __PT_IP_REG tpc |
| #else |
| #define __PT_IP_REG pc |
| #endif |
| |
| #elif defined(bpf_target_riscv) |
| |
| #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) |
| #define __PT_PARM1_REG a0 |
| #define __PT_PARM2_REG a1 |
| #define __PT_PARM3_REG a2 |
| #define __PT_PARM4_REG a3 |
| #define __PT_PARM5_REG a4 |
| #define __PT_RET_REG ra |
| #define __PT_FP_REG s0 |
| #define __PT_RC_REG a0 |
| #define __PT_SP_REG sp |
| #define __PT_IP_REG pc |
| /* riscv does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
| #define PT_REGS_SYSCALL_REGS(ctx) ctx |
| |
| #elif defined(bpf_target_arc) |
| |
| /* arc provides struct user_pt_regs instead of struct pt_regs to userspace */ |
| #define __PT_REGS_CAST(x) ((const struct user_regs_struct *)(x)) |
| #define __PT_PARM1_REG scratch.r0 |
| #define __PT_PARM2_REG scratch.r1 |
| #define __PT_PARM3_REG scratch.r2 |
| #define __PT_PARM4_REG scratch.r3 |
| #define __PT_PARM5_REG scratch.r4 |
| #define __PT_RET_REG scratch.blink |
| #define __PT_FP_REG __unsupported__ |
| #define __PT_RC_REG scratch.r0 |
| #define __PT_SP_REG scratch.sp |
| #define __PT_IP_REG scratch.ret |
| /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */ |
| #define PT_REGS_SYSCALL_REGS(ctx) ctx |
| |
| #endif |
| |
| #if defined(bpf_target_defined) |
| |
| struct pt_regs; |
| |
| /* allow some architecutres to override `struct pt_regs` */ |
| #ifndef __PT_REGS_CAST |
| #define __PT_REGS_CAST(x) (x) |
| #endif |
| |
| #define PT_REGS_PARM1(x) (__PT_REGS_CAST(x)->__PT_PARM1_REG) |
| #define PT_REGS_PARM2(x) (__PT_REGS_CAST(x)->__PT_PARM2_REG) |
| #define PT_REGS_PARM3(x) (__PT_REGS_CAST(x)->__PT_PARM3_REG) |
| #define PT_REGS_PARM4(x) (__PT_REGS_CAST(x)->__PT_PARM4_REG) |
| #define PT_REGS_PARM5(x) (__PT_REGS_CAST(x)->__PT_PARM5_REG) |
| #define PT_REGS_RET(x) (__PT_REGS_CAST(x)->__PT_RET_REG) |
| #define PT_REGS_FP(x) (__PT_REGS_CAST(x)->__PT_FP_REG) |
| #define PT_REGS_RC(x) (__PT_REGS_CAST(x)->__PT_RC_REG) |
| #define PT_REGS_SP(x) (__PT_REGS_CAST(x)->__PT_SP_REG) |
| #define PT_REGS_IP(x) (__PT_REGS_CAST(x)->__PT_IP_REG) |
| |
| #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_REG) |
| #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_REG) |
| #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_REG) |
| #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_REG) |
| #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_REG) |
| #define PT_REGS_RET_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RET_REG) |
| #define PT_REGS_FP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_FP_REG) |
| #define PT_REGS_RC_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_RC_REG) |
| #define PT_REGS_SP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_SP_REG) |
| #define PT_REGS_IP_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_IP_REG) |
| |
| #if defined(bpf_target_powerpc) |
| |
| #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) |
| #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP |
| |
| #elif defined(bpf_target_sparc) |
| |
| #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) |
| #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP |
| |
| #else |
| |
| #define BPF_KPROBE_READ_RET_IP(ip, ctx) \ |
| ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) |
| #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ |
| ({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) |
| |
| #endif |
| |
| #ifndef PT_REGS_PARM1_SYSCALL |
| #define PT_REGS_PARM1_SYSCALL(x) PT_REGS_PARM1(x) |
| #endif |
| #define PT_REGS_PARM2_SYSCALL(x) PT_REGS_PARM2(x) |
| #define PT_REGS_PARM3_SYSCALL(x) PT_REGS_PARM3(x) |
| #ifndef PT_REGS_PARM4_SYSCALL |
| #define PT_REGS_PARM4_SYSCALL(x) PT_REGS_PARM4(x) |
| #endif |
| #define PT_REGS_PARM5_SYSCALL(x) PT_REGS_PARM5(x) |
| |
| #ifndef PT_REGS_PARM1_CORE_SYSCALL |
| #define PT_REGS_PARM1_CORE_SYSCALL(x) PT_REGS_PARM1_CORE(x) |
| #endif |
| #define PT_REGS_PARM2_CORE_SYSCALL(x) PT_REGS_PARM2_CORE(x) |
| #define PT_REGS_PARM3_CORE_SYSCALL(x) PT_REGS_PARM3_CORE(x) |
| #ifndef PT_REGS_PARM4_CORE_SYSCALL |
| #define PT_REGS_PARM4_CORE_SYSCALL(x) PT_REGS_PARM4_CORE(x) |
| #endif |
| #define PT_REGS_PARM5_CORE_SYSCALL(x) PT_REGS_PARM5_CORE(x) |
| |
| #else /* defined(bpf_target_defined) */ |
| |
| #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| |
| #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| |
| #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| |
| #define PT_REGS_PARM1_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM2_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM3_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM4_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM5_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| |
| #define PT_REGS_PARM1_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM2_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM3_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM4_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| #define PT_REGS_PARM5_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
| |
| #endif /* defined(bpf_target_defined) */ |
| |
| /* |
| * When invoked from a syscall handler kprobe, returns a pointer to a |
| * struct pt_regs containing syscall arguments and suitable for passing to |
| * PT_REGS_PARMn_SYSCALL() and PT_REGS_PARMn_CORE_SYSCALL(). |
| */ |
| #ifndef PT_REGS_SYSCALL_REGS |
| /* By default, assume that the arch selects ARCH_HAS_SYSCALL_WRAPPER. */ |
| #define PT_REGS_SYSCALL_REGS(ctx) ((struct pt_regs *)PT_REGS_PARM1(ctx)) |
| #endif |
| |
| #ifndef ___bpf_concat |
| #define ___bpf_concat(a, b) a ## b |
| #endif |
| #ifndef ___bpf_apply |
| #define ___bpf_apply(fn, n) ___bpf_concat(fn, n) |
| #endif |
| #ifndef ___bpf_nth |
| #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N |
| #endif |
| #ifndef ___bpf_narg |
| #define ___bpf_narg(...) ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) |
| #endif |
| |
| #define ___bpf_ctx_cast0() ctx |
| #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0] |
| #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1] |
| #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2] |
| #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3] |
| #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4] |
| #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5] |
| #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6] |
| #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7] |
| #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8] |
| #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9] |
| #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10] |
| #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11] |
| #define ___bpf_ctx_cast(args...) ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) |
| |
| /* |
| * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and |
| * similar kinds of BPF programs, that accept input arguments as a single |
| * pointer to untyped u64 array, where each u64 can actually be a typed |
| * pointer or integer of different size. Instead of requring user to write |
| * manual casts and work with array elements by index, BPF_PROG macro |
| * allows user to declare a list of named and typed input arguments in the |
| * same syntax as for normal C function. All the casting is hidden and |
| * performed transparently, while user code can just assume working with |
| * function arguments of specified type and name. |
| * |
| * Original raw context argument is preserved as well as 'ctx' argument. |
| * This is useful when using BPF helpers that expect original context |
| * as one of the parameters (e.g., for bpf_perf_event_output()). |
| */ |
| #define BPF_PROG(name, args...) \ |
| name(unsigned long long *ctx); \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(unsigned long long *ctx, ##args); \ |
| typeof(name(0)) name(unsigned long long *ctx) \ |
| { \ |
| _Pragma("GCC diagnostic push") \ |
| _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| return ____##name(___bpf_ctx_cast(args)); \ |
| _Pragma("GCC diagnostic pop") \ |
| } \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(unsigned long long *ctx, ##args) |
| |
| #ifndef ___bpf_nth2 |
| #define ___bpf_nth2(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, \ |
| _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, N, ...) N |
| #endif |
| #ifndef ___bpf_narg2 |
| #define ___bpf_narg2(...) \ |
| ___bpf_nth2(_, ##__VA_ARGS__, 12, 12, 11, 11, 10, 10, 9, 9, 8, 8, 7, 7, \ |
| 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 1, 1, 0) |
| #endif |
| |
| #define ___bpf_treg_cnt(t) \ |
| __builtin_choose_expr(sizeof(t) == 1, 1, \ |
| __builtin_choose_expr(sizeof(t) == 2, 1, \ |
| __builtin_choose_expr(sizeof(t) == 4, 1, \ |
| __builtin_choose_expr(sizeof(t) == 8, 1, \ |
| __builtin_choose_expr(sizeof(t) == 16, 2, \ |
| (void)0))))) |
| |
| #define ___bpf_reg_cnt0() (0) |
| #define ___bpf_reg_cnt1(t, x) (___bpf_reg_cnt0() + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt2(t, x, args...) (___bpf_reg_cnt1(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt3(t, x, args...) (___bpf_reg_cnt2(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt4(t, x, args...) (___bpf_reg_cnt3(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt5(t, x, args...) (___bpf_reg_cnt4(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt6(t, x, args...) (___bpf_reg_cnt5(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt7(t, x, args...) (___bpf_reg_cnt6(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt8(t, x, args...) (___bpf_reg_cnt7(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt9(t, x, args...) (___bpf_reg_cnt8(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt10(t, x, args...) (___bpf_reg_cnt9(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt11(t, x, args...) (___bpf_reg_cnt10(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt12(t, x, args...) (___bpf_reg_cnt11(args) + ___bpf_treg_cnt(t)) |
| #define ___bpf_reg_cnt(args...) ___bpf_apply(___bpf_reg_cnt, ___bpf_narg2(args))(args) |
| |
| #define ___bpf_union_arg(t, x, n) \ |
| __builtin_choose_expr(sizeof(t) == 1, ({ union { __u8 z[1]; t x; } ___t = { .z = {ctx[n]}}; ___t.x; }), \ |
| __builtin_choose_expr(sizeof(t) == 2, ({ union { __u16 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ |
| __builtin_choose_expr(sizeof(t) == 4, ({ union { __u32 z[1]; t x; } ___t = { .z = {ctx[n]} }; ___t.x; }), \ |
| __builtin_choose_expr(sizeof(t) == 8, ({ union { __u64 z[1]; t x; } ___t = {.z = {ctx[n]} }; ___t.x; }), \ |
| __builtin_choose_expr(sizeof(t) == 16, ({ union { __u64 z[2]; t x; } ___t = {.z = {ctx[n], ctx[n + 1]} }; ___t.x; }), \ |
| (void)0))))) |
| |
| #define ___bpf_ctx_arg0(n, args...) |
| #define ___bpf_ctx_arg1(n, t, x) , ___bpf_union_arg(t, x, n - ___bpf_reg_cnt1(t, x)) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #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) |
| #define ___bpf_ctx_arg(args...) ___bpf_apply(___bpf_ctx_arg, ___bpf_narg2(args))(___bpf_reg_cnt(args), args) |
| |
| #define ___bpf_ctx_decl0() |
| #define ___bpf_ctx_decl1(t, x) , t x |
| #define ___bpf_ctx_decl2(t, x, args...) , t x ___bpf_ctx_decl1(args) |
| #define ___bpf_ctx_decl3(t, x, args...) , t x ___bpf_ctx_decl2(args) |
| #define ___bpf_ctx_decl4(t, x, args...) , t x ___bpf_ctx_decl3(args) |
| #define ___bpf_ctx_decl5(t, x, args...) , t x ___bpf_ctx_decl4(args) |
| #define ___bpf_ctx_decl6(t, x, args...) , t x ___bpf_ctx_decl5(args) |
| #define ___bpf_ctx_decl7(t, x, args...) , t x ___bpf_ctx_decl6(args) |
| #define ___bpf_ctx_decl8(t, x, args...) , t x ___bpf_ctx_decl7(args) |
| #define ___bpf_ctx_decl9(t, x, args...) , t x ___bpf_ctx_decl8(args) |
| #define ___bpf_ctx_decl10(t, x, args...) , t x ___bpf_ctx_decl9(args) |
| #define ___bpf_ctx_decl11(t, x, args...) , t x ___bpf_ctx_decl10(args) |
| #define ___bpf_ctx_decl12(t, x, args...) , t x ___bpf_ctx_decl11(args) |
| #define ___bpf_ctx_decl(args...) ___bpf_apply(___bpf_ctx_decl, ___bpf_narg2(args))(args) |
| |
| /* |
| * BPF_PROG2 is an enhanced version of BPF_PROG in order to handle struct |
| * arguments. Since each struct argument might take one or two u64 values |
| * in the trampoline stack, argument type size is needed to place proper number |
| * of u64 values for each argument. Therefore, BPF_PROG2 has different |
| * syntax from BPF_PROG. For example, for the following BPF_PROG syntax: |
| * |
| * int BPF_PROG(test2, int a, int b) { ... } |
| * |
| * the corresponding BPF_PROG2 syntax is: |
| * |
| * int BPF_PROG2(test2, int, a, int, b) { ... } |
| * |
| * where type and the corresponding argument name are separated by comma. |
| * |
| * Use BPF_PROG2 macro if one of the arguments might be a struct/union larger |
| * than 8 bytes: |
| * |
| * int BPF_PROG2(test_struct_arg, struct bpf_testmod_struct_arg_1, a, int, b, |
| * int, c, int, d, struct bpf_testmod_struct_arg_2, e, int, ret) |
| * { |
| * // access a, b, c, d, e, and ret directly |
| * ... |
| * } |
| */ |
| #define BPF_PROG2(name, args...) \ |
| name(unsigned long long *ctx); \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)); \ |
| typeof(name(0)) name(unsigned long long *ctx) \ |
| { \ |
| return ____##name(ctx ___bpf_ctx_arg(args)); \ |
| } \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(unsigned long long *ctx ___bpf_ctx_decl(args)) |
| |
| struct pt_regs; |
| |
| #define ___bpf_kprobe_args0() ctx |
| #define ___bpf_kprobe_args1(x) ___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx) |
| #define ___bpf_kprobe_args2(x, args...) ___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx) |
| #define ___bpf_kprobe_args3(x, args...) ___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx) |
| #define ___bpf_kprobe_args4(x, args...) ___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx) |
| #define ___bpf_kprobe_args5(x, args...) ___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx) |
| #define ___bpf_kprobe_args(args...) ___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args) |
| |
| /* |
| * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for |
| * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific |
| * low-level way of getting kprobe input arguments from struct pt_regs, and |
| * provides a familiar typed and named function arguments syntax and |
| * semantics of accessing kprobe input paremeters. |
| * |
| * Original struct pt_regs* context is preserved as 'ctx' argument. This might |
| * be necessary when using BPF helpers like bpf_perf_event_output(). |
| */ |
| #define BPF_KPROBE(name, args...) \ |
| name(struct pt_regs *ctx); \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(struct pt_regs *ctx, ##args); \ |
| typeof(name(0)) name(struct pt_regs *ctx) \ |
| { \ |
| _Pragma("GCC diagnostic push") \ |
| _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| return ____##name(___bpf_kprobe_args(args)); \ |
| _Pragma("GCC diagnostic pop") \ |
| } \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(struct pt_regs *ctx, ##args) |
| |
| #define ___bpf_kretprobe_args0() ctx |
| #define ___bpf_kretprobe_args1(x) ___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx) |
| #define ___bpf_kretprobe_args(args...) ___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args) |
| |
| /* |
| * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional |
| * return value (in addition to `struct pt_regs *ctx`), but no input |
| * arguments, because they will be clobbered by the time probed function |
| * returns. |
| */ |
| #define BPF_KRETPROBE(name, args...) \ |
| name(struct pt_regs *ctx); \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(struct pt_regs *ctx, ##args); \ |
| typeof(name(0)) name(struct pt_regs *ctx) \ |
| { \ |
| _Pragma("GCC diagnostic push") \ |
| _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| return ____##name(___bpf_kretprobe_args(args)); \ |
| _Pragma("GCC diagnostic pop") \ |
| } \ |
| static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args) |
| |
| /* If kernel has CONFIG_ARCH_HAS_SYSCALL_WRAPPER, read pt_regs directly */ |
| #define ___bpf_syscall_args0() ctx |
| #define ___bpf_syscall_args1(x) ___bpf_syscall_args0(), (void *)PT_REGS_PARM1_SYSCALL(regs) |
| #define ___bpf_syscall_args2(x, args...) ___bpf_syscall_args1(args), (void *)PT_REGS_PARM2_SYSCALL(regs) |
| #define ___bpf_syscall_args3(x, args...) ___bpf_syscall_args2(args), (void *)PT_REGS_PARM3_SYSCALL(regs) |
| #define ___bpf_syscall_args4(x, args...) ___bpf_syscall_args3(args), (void *)PT_REGS_PARM4_SYSCALL(regs) |
| #define ___bpf_syscall_args5(x, args...) ___bpf_syscall_args4(args), (void *)PT_REGS_PARM5_SYSCALL(regs) |
| #define ___bpf_syscall_args(args...) ___bpf_apply(___bpf_syscall_args, ___bpf_narg(args))(args) |
| |
| /* If kernel doesn't have CONFIG_ARCH_HAS_SYSCALL_WRAPPER, we have to BPF_CORE_READ from pt_regs */ |
| #define ___bpf_syswrap_args0() ctx |
| #define ___bpf_syswrap_args1(x) ___bpf_syswrap_args0(), (void *)PT_REGS_PARM1_CORE_SYSCALL(regs) |
| #define ___bpf_syswrap_args2(x, args...) ___bpf_syswrap_args1(args), (void *)PT_REGS_PARM2_CORE_SYSCALL(regs) |
| #define ___bpf_syswrap_args3(x, args...) ___bpf_syswrap_args2(args), (void *)PT_REGS_PARM3_CORE_SYSCALL(regs) |
| #define ___bpf_syswrap_args4(x, args...) ___bpf_syswrap_args3(args), (void *)PT_REGS_PARM4_CORE_SYSCALL(regs) |
| #define ___bpf_syswrap_args5(x, args...) ___bpf_syswrap_args4(args), (void *)PT_REGS_PARM5_CORE_SYSCALL(regs) |
| #define ___bpf_syswrap_args(args...) ___bpf_apply(___bpf_syswrap_args, ___bpf_narg(args))(args) |
| |
| /* |
| * BPF_KSYSCALL is a variant of BPF_KPROBE, which is intended for |
| * tracing syscall functions, like __x64_sys_close. It hides the underlying |
| * platform-specific low-level way of getting syscall input arguments from |
| * struct pt_regs, and provides a familiar typed and named function arguments |
| * syntax and semantics of accessing syscall input parameters. |
| * |
| * Original struct pt_regs * context is preserved as 'ctx' argument. This might |
| * be necessary when using BPF helpers like bpf_perf_event_output(). |
| * |
| * At the moment BPF_KSYSCALL does not transparently handle all the calling |
| * convention quirks for the following syscalls: |
| * |
| * - mmap(): __ARCH_WANT_SYS_OLD_MMAP. |
| * - clone(): CONFIG_CLONE_BACKWARDS, CONFIG_CLONE_BACKWARDS2 and |
| * CONFIG_CLONE_BACKWARDS3. |
| * - socket-related syscalls: __ARCH_WANT_SYS_SOCKETCALL. |
| * - compat syscalls. |
| * |
| * This may or may not change in the future. User needs to take extra measures |
| * to handle such quirks explicitly, if necessary. |
| * |
| * This macro relies on BPF CO-RE support and virtual __kconfig externs. |
| */ |
| #define BPF_KSYSCALL(name, args...) \ |
| name(struct pt_regs *ctx); \ |
| extern _Bool LINUX_HAS_SYSCALL_WRAPPER __kconfig; \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(struct pt_regs *ctx, ##args); \ |
| typeof(name(0)) name(struct pt_regs *ctx) \ |
| { \ |
| struct pt_regs *regs = LINUX_HAS_SYSCALL_WRAPPER \ |
| ? (struct pt_regs *)PT_REGS_PARM1(ctx) \ |
| : ctx; \ |
| _Pragma("GCC diagnostic push") \ |
| _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
| if (LINUX_HAS_SYSCALL_WRAPPER) \ |
| return ____##name(___bpf_syswrap_args(args)); \ |
| else \ |
| return ____##name(___bpf_syscall_args(args)); \ |
| _Pragma("GCC diagnostic pop") \ |
| } \ |
| static __always_inline typeof(name(0)) \ |
| ____##name(struct pt_regs *ctx, ##args) |
| |
| #define BPF_KPROBE_SYSCALL BPF_KSYSCALL |
| |
| #endif |
