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bpf_tracing.h
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ #ifndef __BPF_TRACING_H__ #define __BPF_TRACING_H__ #include "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 #elif defined(__TARGET_ARCH_loongarch) #define bpf_target_loongarch #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 #elif defined(__loongarch__) #define bpf_target_loongarch #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) /* * https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI */ #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_PARM6_REG r9 /* * Syscall uses r10 for PARM4. See arch/x86/entry/entry_64.S:entry_SYSCALL_64 * comments in Linux sources. And refer to syscall(2) manpage. */ #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG r10 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #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 #else #ifdef __i386__ /* i386 kernel is built with -mregparm=3 */ #define __PT_PARM1_REG eax #define __PT_PARM2_REG edx #define __PT_PARM3_REG ecx /* i386 syscall ABI is very different, refer to syscall(2) manpage */ #define __PT_PARM1_SYSCALL_REG ebx #define __PT_PARM2_SYSCALL_REG ecx #define __PT_PARM3_SYSCALL_REG edx #define __PT_PARM4_SYSCALL_REG esi #define __PT_PARM5_SYSCALL_REG edi #define __PT_PARM6_SYSCALL_REG ebp #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_PARM6_REG r9 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG r10 #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #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 #endif /* __i386__ */ #endif /* __KERNEL__ || __VMLINUX_H__ */ #elif defined(bpf_target_s390) /* * https://github.com/IBM/s390x-abi/releases/download/v1.6/lzsabi_s390x.pdf */ 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_PARM1_SYSCALL_REG orig_gpr2 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG gprs[7] #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), __PT_PARM1_SYSCALL_REG) #define __PT_RET_REG gprs[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 #elif defined(bpf_target_arm) /* * https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst#machine-registers */ #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_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG uregs[4] #define __PT_PARM6_SYSCALL_REG uregs[5] #define __PT_PARM7_SYSCALL_REG uregs[6] #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) /* * https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#machine-registers */ 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_PARM6_REG regs[5] #define __PT_PARM7_REG regs[6] #define __PT_PARM8_REG regs[7] #define __PT_PARM1_SYSCALL_REG orig_x0 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #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), __PT_PARM1_SYSCALL_REG) #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 #elif defined(bpf_target_mips) /* * N64 ABI is assumed right now. * https://en.wikipedia.org/wiki/MIPS_architecture#Calling_conventions */ #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_PARM6_REG regs[9] #define __PT_PARM7_REG regs[10] #define __PT_PARM8_REG regs[11] #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG /* only N32/N64 */ #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG /* only N32/N64 */ #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) /* * http://refspecs.linux-foundation.org/elf/elfspec_ppc.pdf (page 3-14, * section "Function Calling Sequence") */ #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_PARM6_REG gpr[8] #define __PT_PARM7_REG gpr[9] #define __PT_PARM8_REG gpr[10] /* powerpc does not select ARCH_HAS_SYSCALL_WRAPPER. */ #define PT_REGS_SYSCALL_REGS(ctx) ctx #define __PT_PARM1_SYSCALL_REG orig_gpr3 #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #if !defined(__arch64__) #define __PT_PARM7_SYSCALL_REG __PT_PARM7_REG /* only powerpc (not powerpc64) */ #endif #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 #elif defined(bpf_target_sparc) /* * https://en.wikipedia.org/wiki/Calling_convention#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_PARM6_REG u_regs[UREG_I5] #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #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) /* * https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc#risc-v-calling-conventions */ /* riscv provides struct user_regs_struct instead of struct pt_regs to userspace */ #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_PARM6_REG a5 #define __PT_PARM7_REG a6 #define __PT_PARM8_REG a7 #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #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 #elif defined(bpf_target_arc) /* * Section "Function Calling Sequence" (page 24): * https://raw.githubusercontent.com/wiki/foss-for-synopsys-dwc-arc-processors/toolchain/files/ARCv2_ABI.pdf */ /* arc provides struct user_regs_struct 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_PARM6_REG scratch.r5 #define __PT_PARM7_REG scratch.r6 #define __PT_PARM8_REG scratch.r7 /* arc does not select ARCH_HAS_SYSCALL_WRAPPER. */ #define PT_REGS_SYSCALL_REGS(ctx) ctx #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #define __PT_RET_REG scratch.blink #define __PT_FP_REG scratch.fp #define __PT_RC_REG scratch.r0 #define __PT_SP_REG scratch.sp #define __PT_IP_REG scratch.ret #elif defined(bpf_target_loongarch) /* * https://docs.kernel.org/loongarch/introduction.html * https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html */ /* loongarch 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[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_PARM6_REG regs[9] #define __PT_PARM7_REG regs[10] #define __PT_PARM8_REG regs[11] /* loongarch does not select ARCH_HAS_SYSCALL_WRAPPER. */ #define PT_REGS_SYSCALL_REGS(ctx) ctx #define __PT_PARM1_SYSCALL_REG __PT_PARM1_REG #define __PT_PARM2_SYSCALL_REG __PT_PARM2_REG #define __PT_PARM3_SYSCALL_REG __PT_PARM3_REG #define __PT_PARM4_SYSCALL_REG __PT_PARM4_REG #define __PT_PARM5_SYSCALL_REG __PT_PARM5_REG #define __PT_PARM6_SYSCALL_REG __PT_PARM6_REG #define __PT_RET_REG regs[1] #define __PT_FP_REG regs[22] #define __PT_RC_REG regs[4] #define __PT_SP_REG regs[3] #define __PT_IP_REG csr_era #endif #if defined(bpf_target_defined) struct pt_regs; /* allow some architectures to override `struct pt_regs` */ #ifndef __PT_REGS_CAST #define __PT_REGS_CAST(x) (x) #endif /* * Different architectures support different number of arguments passed * through registers. i386 supports just 3, some arches support up to 8. */ #ifndef __PT_PARM4_REG #define __PT_PARM4_REG __unsupported__ #endif #ifndef __PT_PARM5_REG #define __PT_PARM5_REG __unsupported__ #endif #ifndef __PT_PARM6_REG #define __PT_PARM6_REG __unsupported__ #endif #ifndef __PT_PARM7_REG #define __PT_PARM7_REG __unsupported__ #endif #ifndef __PT_PARM8_REG #define __PT_PARM8_REG __unsupported__ #endif /* * Similarly, syscall-specific conventions might differ between function call * conventions within each architecutre. All supported architectures pass * either 6 or 7 syscall arguments in registers. * * See syscall(2) manpage for succinct table with information on each arch. */ #ifndef __PT_PARM7_SYSCALL_REG #define __PT_PARM7_SYSCALL_REG __unsupported__ #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_PARM6(x) (__PT_REGS_CAST(x)->__PT_PARM6_REG) #define PT_REGS_PARM7(x) (__PT_REGS_CAST(x)->__PT_PARM7_REG) #define PT_REGS_PARM8(x) (__PT_REGS_CAST(x)->__PT_PARM8_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_PARM6_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM6_REG) #define PT_REGS_PARM7_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM7_REG) #define PT_REGS_PARM8_CORE(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM8_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_CAST(x)->__PT_PARM1_SYSCALL_REG) #define PT_REGS_PARM1_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM1_SYSCALL_REG) #endif #ifndef PT_REGS_PARM2_SYSCALL #define PT_REGS_PARM2_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM2_SYSCALL_REG) #define PT_REGS_PARM2_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM2_SYSCALL_REG) #endif #ifndef PT_REGS_PARM3_SYSCALL #define PT_REGS_PARM3_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM3_SYSCALL_REG) #define PT_REGS_PARM3_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM3_SYSCALL_REG) #endif #ifndef PT_REGS_PARM4_SYSCALL #define PT_REGS_PARM4_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM4_SYSCALL_REG) #define PT_REGS_PARM4_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM4_SYSCALL_REG) #endif #ifndef PT_REGS_PARM5_SYSCALL #define PT_REGS_PARM5_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM5_SYSCALL_REG) #define PT_REGS_PARM5_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM5_SYSCALL_REG) #endif #ifndef PT_REGS_PARM6_SYSCALL #define PT_REGS_PARM6_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM6_SYSCALL_REG) #define PT_REGS_PARM6_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM6_SYSCALL_REG) #endif #ifndef PT_REGS_PARM7_SYSCALL #define PT_REGS_PARM7_SYSCALL(x) (__PT_REGS_CAST(x)->__PT_PARM7_SYSCALL_REG) #define PT_REGS_PARM7_CORE_SYSCALL(x) BPF_CORE_READ(__PT_REGS_CAST(x), __PT_PARM7_SYSCALL_REG) #endif #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_PARM6(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) #define PT_REGS_PARM7(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) #define PT_REGS_PARM8(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_PARM6_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) #define PT_REGS_PARM7_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) #define PT_REGS_PARM8_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_PARM6_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) #define PT_REGS_PARM7_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; }) #define PT_REGS_PARM6_CORE_SYSCALL(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) #define PT_REGS_PARM7_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_args6(x, args...) ___bpf_kprobe_args5(args), (void *)PT_REGS_PARM6(ctx) #define ___bpf_kprobe_args7(x, args...) ___bpf_kprobe_args6(args), (void *)PT_REGS_PARM7(ctx) #define ___bpf_kprobe_args8(x, args...) ___bpf_kprobe_args7(args), (void *)PT_REGS_PARM8(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_args6(x, args...) ___bpf_syscall_args5(args), (void *)PT_REGS_PARM6_SYSCALL(regs) #define ___bpf_syscall_args7(x, args...) ___bpf_syscall_args6(args), (void *)PT_REGS_PARM7_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_args6(x, args...) ___bpf_syswrap_args5(args), (void *)PT_REGS_PARM6_CORE_SYSCALL(regs) #define ___bpf_syswrap_args7(x, args...) ___bpf_syswrap_args6(args), (void *)PT_REGS_PARM7_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 /* BPF_UPROBE and BPF_URETPROBE are identical to BPF_KPROBE and BPF_KRETPROBE, * but are named way less confusingly for SEC("uprobe") and SEC("uretprobe") * use cases. */ #define BPF_UPROBE(name, args...) BPF_KPROBE(name, ##args) #define BPF_URETPROBE(name, args...) BPF_KRETPROBE(name, ##args) #endif
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