mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 23:08:42 +07:00
483d7a30f5
Use PT_REGS_RC instead of PT_REGS_RET to get ret correctly.
Fixes: df8ff35311 ("libbpf: Merge selftests' bpf_trace_helpers.h into libbpf's bpf_tracing.h")
Signed-off-by: Wenbo Zhang <ethercflow@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200315083252.22274-1-ethercflow@gmail.com
417 lines
17 KiB
C
417 lines
17 KiB
C
/* 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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#undef bpf_target_defined
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#endif
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/* Fall back to what the compiler says */
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#ifndef bpf_target_defined
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#if defined(__x86_64__)
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#define bpf_target_x86
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#elif defined(__s390__)
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#define bpf_target_s390
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#elif defined(__arm__)
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#define bpf_target_arm
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#elif defined(__aarch64__)
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#define bpf_target_arm64
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#elif defined(__mips__)
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#define bpf_target_mips
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#elif defined(__powerpc__)
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#define bpf_target_powerpc
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#elif defined(__sparc__)
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#define bpf_target_sparc
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#endif
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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), grps[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), pdw.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[1])
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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[1])
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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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#else
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) \
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({ bpf_probe_read(&(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(&(ip), sizeof(ip), \
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(void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
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#endif
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#define ___bpf_concat(a, b) a ## b
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#define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
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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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#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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#define ___bpf_empty(...) \
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___bpf_nth(_, ##__VA_ARGS__, N, N, N, N, N, N, N, N, N, N, 0)
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|
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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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/*
|
|
* 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
|
|
* 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()).
|
|
*/
|
|
#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") \
|
|
_Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
|
|
return ____##name(___bpf_ctx_cast(args)); \
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|
_Pragma("GCC diagnostic pop") \
|
|
} \
|
|
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...) \
|
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___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
|