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https://github.com/torvalds/linux.git
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196 lines
6.3 KiB
C
196 lines
6.3 KiB
C
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/* 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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#ifdef __KERNEL__
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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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#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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#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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#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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#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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#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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#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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#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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#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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/* 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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#else
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#define PT_REGS_IP(x) ((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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#endif
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