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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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78d8b34751
[ Upstream commit83cd92b464] When initializing the __param array with a one liner, if all args are const, the initial array value will be placed in the rodata section but because libbpf does not support relocation in the rodata section, any pointer in this array will stay NULL. Fixes:c09add2fbc("tools/libbpf: Add bpf_iter support") Signed-off-by: Florent Revest <revest@chromium.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210419155243.1632274-5-revest@chromium.org Signed-off-by: Sasha Levin <sashal@kernel.org>
450 lines
18 KiB
C
450 lines
18 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), 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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#else
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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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#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(...) \
|
|
___bpf_nth(_, ##__VA_ARGS__, N, N, N, N, N, N, N, N, N, N, 0)
|
|
|
|
#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 __attribute__((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 __attribute__((always_inline)) typeof(name(0)) \
|
|
____##name(unsigned long long *ctx, ##args)
|
|
|
|
struct pt_regs;
|
|
|
|
#define ___bpf_kprobe_args0() ctx
|
|
#define ___bpf_kprobe_args1(x) \
|
|
___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx)
|
|
#define ___bpf_kprobe_args2(x, args...) \
|
|
___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx)
|
|
#define ___bpf_kprobe_args3(x, args...) \
|
|
___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx)
|
|
#define ___bpf_kprobe_args4(x, args...) \
|
|
___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx)
|
|
#define ___bpf_kprobe_args5(x, args...) \
|
|
___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx)
|
|
#define ___bpf_kprobe_args(args...) \
|
|
___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args)
|
|
|
|
/*
|
|
* BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for
|
|
* tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific
|
|
* low-level way of getting kprobe input arguments from struct pt_regs, and
|
|
* provides a familiar typed and named function arguments syntax and
|
|
* semantics of accessing kprobe input paremeters.
|
|
*
|
|
* Original struct pt_regs* context is preserved as 'ctx' argument. This might
|
|
* be necessary when using BPF helpers like bpf_perf_event_output().
|
|
*/
|
|
#define BPF_KPROBE(name, args...) \
|
|
name(struct pt_regs *ctx); \
|
|
static __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)
|
|
|
|
#define ___bpf_fill0(arr, p, x) do {} while (0)
|
|
#define ___bpf_fill1(arr, p, x) arr[p] = x
|
|
#define ___bpf_fill2(arr, p, x, args...) arr[p] = x; ___bpf_fill1(arr, p + 1, args)
|
|
#define ___bpf_fill3(arr, p, x, args...) arr[p] = x; ___bpf_fill2(arr, p + 1, args)
|
|
#define ___bpf_fill4(arr, p, x, args...) arr[p] = x; ___bpf_fill3(arr, p + 1, args)
|
|
#define ___bpf_fill5(arr, p, x, args...) arr[p] = x; ___bpf_fill4(arr, p + 1, args)
|
|
#define ___bpf_fill6(arr, p, x, args...) arr[p] = x; ___bpf_fill5(arr, p + 1, args)
|
|
#define ___bpf_fill7(arr, p, x, args...) arr[p] = x; ___bpf_fill6(arr, p + 1, args)
|
|
#define ___bpf_fill8(arr, p, x, args...) arr[p] = x; ___bpf_fill7(arr, p + 1, args)
|
|
#define ___bpf_fill9(arr, p, x, args...) arr[p] = x; ___bpf_fill8(arr, p + 1, args)
|
|
#define ___bpf_fill10(arr, p, x, args...) arr[p] = x; ___bpf_fill9(arr, p + 1, args)
|
|
#define ___bpf_fill11(arr, p, x, args...) arr[p] = x; ___bpf_fill10(arr, p + 1, args)
|
|
#define ___bpf_fill12(arr, p, x, args...) arr[p] = x; ___bpf_fill11(arr, p + 1, args)
|
|
#define ___bpf_fill(arr, args...) \
|
|
___bpf_apply(___bpf_fill, ___bpf_narg(args))(arr, 0, args)
|
|
|
|
/*
|
|
* BPF_SEQ_PRINTF to wrap bpf_seq_printf to-be-printed values
|
|
* in a structure.
|
|
*/
|
|
#define BPF_SEQ_PRINTF(seq, fmt, args...) \
|
|
({ \
|
|
static const char ___fmt[] = fmt; \
|
|
unsigned long long ___param[___bpf_narg(args)]; \
|
|
\
|
|
_Pragma("GCC diagnostic push") \
|
|
_Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \
|
|
___bpf_fill(___param, args); \
|
|
_Pragma("GCC diagnostic pop") \
|
|
\
|
|
bpf_seq_printf(seq, ___fmt, sizeof(___fmt), \
|
|
___param, sizeof(___param)); \
|
|
})
|
|
|
|
#endif
|