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460 lines
19 KiB
460 lines
19 KiB
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
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#ifndef __BPF_TRACING_H__ |
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#define __BPF_TRACING_H__ |
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/* Scan the ARCH passed in from ARCH env variable (see Makefile) */ |
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#if defined(__TARGET_ARCH_x86) |
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#define bpf_target_x86 |
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#define bpf_target_defined |
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#elif defined(__TARGET_ARCH_s390) |
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#define bpf_target_s390 |
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#define bpf_target_defined |
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#elif defined(__TARGET_ARCH_arm) |
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#define bpf_target_arm |
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#define bpf_target_defined |
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#elif defined(__TARGET_ARCH_arm64) |
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#define bpf_target_arm64 |
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#define bpf_target_defined |
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#elif defined(__TARGET_ARCH_mips) |
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#define bpf_target_mips |
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#define bpf_target_defined |
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#elif defined(__TARGET_ARCH_powerpc) |
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#define bpf_target_powerpc |
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#define bpf_target_defined |
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#elif defined(__TARGET_ARCH_sparc) |
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#define bpf_target_sparc |
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#define bpf_target_defined |
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#else |
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/* Fall back to what the compiler says */ |
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#if defined(__x86_64__) |
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#define bpf_target_x86 |
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#define bpf_target_defined |
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#elif defined(__s390__) |
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#define bpf_target_s390 |
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#define bpf_target_defined |
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#elif defined(__arm__) |
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#define bpf_target_arm |
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#define bpf_target_defined |
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#elif defined(__aarch64__) |
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#define bpf_target_arm64 |
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#define bpf_target_defined |
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#elif defined(__mips__) |
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#define bpf_target_mips |
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#define bpf_target_defined |
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#elif defined(__powerpc__) |
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#define bpf_target_powerpc |
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#define bpf_target_defined |
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#elif defined(__sparc__) |
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#define bpf_target_sparc |
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#define bpf_target_defined |
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#endif /* no compiler target */ |
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#endif |
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#ifndef __BPF_TARGET_MISSING |
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#define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\"" |
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#endif |
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#if defined(bpf_target_x86) |
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#if defined(__KERNEL__) || defined(__VMLINUX_H__) |
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#define PT_REGS_PARM1(x) ((x)->di) |
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#define PT_REGS_PARM2(x) ((x)->si) |
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#define PT_REGS_PARM3(x) ((x)->dx) |
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#define PT_REGS_PARM4(x) ((x)->cx) |
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#define PT_REGS_PARM5(x) ((x)->r8) |
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#define PT_REGS_RET(x) ((x)->sp) |
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#define PT_REGS_FP(x) ((x)->bp) |
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#define PT_REGS_RC(x) ((x)->ax) |
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#define PT_REGS_SP(x) ((x)->sp) |
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#define PT_REGS_IP(x) ((x)->ip) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), di) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), si) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), dx) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), cx) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), sp) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), bp) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), ax) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), ip) |
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#else |
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#ifdef __i386__ |
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/* i386 kernel is built with -mregparm=3 */ |
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#define PT_REGS_PARM1(x) ((x)->eax) |
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#define PT_REGS_PARM2(x) ((x)->edx) |
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#define PT_REGS_PARM3(x) ((x)->ecx) |
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#define PT_REGS_PARM4(x) 0 |
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#define PT_REGS_PARM5(x) 0 |
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#define PT_REGS_RET(x) ((x)->esp) |
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#define PT_REGS_FP(x) ((x)->ebp) |
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#define PT_REGS_RC(x) ((x)->eax) |
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#define PT_REGS_SP(x) ((x)->esp) |
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#define PT_REGS_IP(x) ((x)->eip) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), eax) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), edx) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), ecx) |
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#define PT_REGS_PARM4_CORE(x) 0 |
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#define PT_REGS_PARM5_CORE(x) 0 |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), esp) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), ebp) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), eax) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), esp) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), eip) |
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#else |
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#define PT_REGS_PARM1(x) ((x)->rdi) |
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#define PT_REGS_PARM2(x) ((x)->rsi) |
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#define PT_REGS_PARM3(x) ((x)->rdx) |
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#define PT_REGS_PARM4(x) ((x)->rcx) |
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#define PT_REGS_PARM5(x) ((x)->r8) |
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#define PT_REGS_RET(x) ((x)->rsp) |
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#define PT_REGS_FP(x) ((x)->rbp) |
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#define PT_REGS_RC(x) ((x)->rax) |
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#define PT_REGS_SP(x) ((x)->rsp) |
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#define PT_REGS_IP(x) ((x)->rip) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), rdi) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), rsi) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), rdx) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), rcx) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), rsp) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), rbp) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), rax) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), rsp) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), rip) |
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#endif |
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#endif |
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#elif defined(bpf_target_s390) |
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/* s390 provides user_pt_regs instead of struct pt_regs to userspace */ |
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struct pt_regs; |
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#define PT_REGS_S390 const volatile user_pt_regs |
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#define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2]) |
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#define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3]) |
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#define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4]) |
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#define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5]) |
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#define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6]) |
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#define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14]) |
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/* Works only with CONFIG_FRAME_POINTER */ |
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#define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11]) |
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#define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2]) |
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#define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15]) |
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#define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2]) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[3]) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[4]) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[5]) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[6]) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[14]) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[11]) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2]) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[15]) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), psw.addr) |
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#elif defined(bpf_target_arm) |
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#define PT_REGS_PARM1(x) ((x)->uregs[0]) |
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#define PT_REGS_PARM2(x) ((x)->uregs[1]) |
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#define PT_REGS_PARM3(x) ((x)->uregs[2]) |
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#define PT_REGS_PARM4(x) ((x)->uregs[3]) |
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#define PT_REGS_PARM5(x) ((x)->uregs[4]) |
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#define PT_REGS_RET(x) ((x)->uregs[14]) |
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#define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */ |
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#define PT_REGS_RC(x) ((x)->uregs[0]) |
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#define PT_REGS_SP(x) ((x)->uregs[13]) |
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#define PT_REGS_IP(x) ((x)->uregs[12]) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), uregs[0]) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), uregs[1]) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), uregs[2]) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), uregs[3]) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), uregs[4]) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), uregs[14]) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), uregs[11]) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), uregs[0]) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), uregs[13]) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), uregs[12]) |
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#elif defined(bpf_target_arm64) |
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/* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */ |
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struct pt_regs; |
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#define PT_REGS_ARM64 const volatile struct user_pt_regs |
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#define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0]) |
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#define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1]) |
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#define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2]) |
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#define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3]) |
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#define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4]) |
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#define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30]) |
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/* Works only with CONFIG_FRAME_POINTER */ |
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#define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29]) |
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#define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0]) |
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#define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp) |
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#define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0]) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[1]) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[2]) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[3]) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[4]) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[30]) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[29]) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0]) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), sp) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), pc) |
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#elif defined(bpf_target_mips) |
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#define PT_REGS_PARM1(x) ((x)->regs[4]) |
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#define PT_REGS_PARM2(x) ((x)->regs[5]) |
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#define PT_REGS_PARM3(x) ((x)->regs[6]) |
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#define PT_REGS_PARM4(x) ((x)->regs[7]) |
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#define PT_REGS_PARM5(x) ((x)->regs[8]) |
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#define PT_REGS_RET(x) ((x)->regs[31]) |
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#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ |
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#define PT_REGS_RC(x) ((x)->regs[2]) |
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#define PT_REGS_SP(x) ((x)->regs[29]) |
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#define PT_REGS_IP(x) ((x)->cp0_epc) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), regs[4]) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), regs[5]) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), regs[6]) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), regs[7]) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8]) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31]) |
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#define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30]) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[2]) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29]) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc) |
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#elif defined(bpf_target_powerpc) |
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#define PT_REGS_PARM1(x) ((x)->gpr[3]) |
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#define PT_REGS_PARM2(x) ((x)->gpr[4]) |
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#define PT_REGS_PARM3(x) ((x)->gpr[5]) |
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#define PT_REGS_PARM4(x) ((x)->gpr[6]) |
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#define PT_REGS_PARM5(x) ((x)->gpr[7]) |
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#define PT_REGS_RC(x) ((x)->gpr[3]) |
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#define PT_REGS_SP(x) ((x)->sp) |
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#define PT_REGS_IP(x) ((x)->nip) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), gpr[3]) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), gpr[4]) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), gpr[5]) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), gpr[6]) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), gpr[7]) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), gpr[3]) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), nip) |
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#elif defined(bpf_target_sparc) |
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#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0]) |
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#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1]) |
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#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2]) |
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#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3]) |
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#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4]) |
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#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7]) |
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#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0]) |
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#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP]) |
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#define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0]) |
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#define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I1]) |
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#define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I2]) |
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#define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I3]) |
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#define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I4]) |
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#define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I7]) |
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#define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0]) |
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#define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), u_regs[UREG_FP]) |
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/* Should this also be a bpf_target check for the sparc case? */ |
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#if defined(__arch64__) |
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#define PT_REGS_IP(x) ((x)->tpc) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), tpc) |
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#else |
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#define PT_REGS_IP(x) ((x)->pc) |
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#define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), pc) |
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#endif |
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#endif |
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#if defined(bpf_target_powerpc) |
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) |
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#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP |
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#elif defined(bpf_target_sparc) |
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) |
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#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP |
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#elif defined(bpf_target_defined) |
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) \ |
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({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) |
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#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) \ |
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({ bpf_probe_read_kernel(&(ip), sizeof(ip), \ |
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(void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) |
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#endif |
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#if !defined(bpf_target_defined) |
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#define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; }) |
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#endif /* !defined(bpf_target_defined) */ |
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#ifndef ___bpf_concat |
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#define ___bpf_concat(a, b) a ## b |
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#endif |
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#ifndef ___bpf_apply |
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#define ___bpf_apply(fn, n) ___bpf_concat(fn, n) |
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#endif |
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#ifndef ___bpf_nth |
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#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N |
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#endif |
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#ifndef ___bpf_narg |
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#define ___bpf_narg(...) \ |
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___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) |
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#endif |
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#define ___bpf_ctx_cast0() ctx |
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#define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0] |
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#define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1] |
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#define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2] |
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#define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3] |
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#define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4] |
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#define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5] |
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#define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6] |
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#define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7] |
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#define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8] |
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#define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9] |
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#define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10] |
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#define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11] |
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#define ___bpf_ctx_cast(args...) \ |
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___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args) |
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|
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/* |
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* BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and |
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* similar kinds of BPF programs, that accept input arguments as a single |
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* pointer to untyped u64 array, where each u64 can actually be a typed |
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* pointer or integer of different size. Instead of requring user to write |
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* manual casts and work with array elements by index, BPF_PROG macro |
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* allows user to declare a list of named and typed input arguments in the |
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* same syntax as for normal C function. All the casting is hidden and |
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* performed transparently, while user code can just assume working with |
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* function arguments of specified type and name. |
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* |
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* Original raw context argument is preserved as well as 'ctx' argument. |
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* This is useful when using BPF helpers that expect original context |
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* as one of the parameters (e.g., for bpf_perf_event_output()). |
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*/ |
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#define BPF_PROG(name, args...) \ |
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name(unsigned long long *ctx); \ |
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static __attribute__((always_inline)) typeof(name(0)) \ |
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____##name(unsigned long long *ctx, ##args); \ |
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typeof(name(0)) name(unsigned long long *ctx) \ |
|
{ \ |
|
_Pragma("GCC diagnostic push") \ |
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_Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ |
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return ____##name(___bpf_ctx_cast(args)); \ |
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_Pragma("GCC diagnostic pop") \ |
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} \ |
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static __attribute__((always_inline)) typeof(name(0)) \ |
|
____##name(unsigned long long *ctx, ##args) |
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|
|
struct pt_regs; |
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|
|
#define ___bpf_kprobe_args0() ctx |
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#define ___bpf_kprobe_args1(x) \ |
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___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx) |
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#define ___bpf_kprobe_args2(x, args...) \ |
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___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx) |
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#define ___bpf_kprobe_args3(x, args...) \ |
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___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx) |
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#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) |
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|
|
/* |
|
* 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 __attribute__((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 __attribute__((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 __attribute__((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) |
|
|
|
#endif
|
|
|