1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun #ifndef _ASM_POWERPC_KPROBES_H 3*4882a593Smuzhiyun #define _ASM_POWERPC_KPROBES_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <asm-generic/kprobes.h> 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #ifdef __KERNEL__ 8*4882a593Smuzhiyun /* 9*4882a593Smuzhiyun * Kernel Probes (KProbes) 10*4882a593Smuzhiyun * 11*4882a593Smuzhiyun * Copyright (C) IBM Corporation, 2002, 2004 12*4882a593Smuzhiyun * 13*4882a593Smuzhiyun * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel 14*4882a593Smuzhiyun * Probes initial implementation ( includes suggestions from 15*4882a593Smuzhiyun * Rusty Russell). 16*4882a593Smuzhiyun * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli 17*4882a593Smuzhiyun * <ananth@in.ibm.com> 18*4882a593Smuzhiyun */ 19*4882a593Smuzhiyun #include <linux/types.h> 20*4882a593Smuzhiyun #include <linux/ptrace.h> 21*4882a593Smuzhiyun #include <linux/percpu.h> 22*4882a593Smuzhiyun #include <linux/module.h> 23*4882a593Smuzhiyun #include <asm/probes.h> 24*4882a593Smuzhiyun #include <asm/code-patching.h> 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun #ifdef CONFIG_KPROBES 27*4882a593Smuzhiyun #define __ARCH_WANT_KPROBES_INSN_SLOT 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun struct pt_regs; 30*4882a593Smuzhiyun struct kprobe; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun typedef ppc_opcode_t kprobe_opcode_t; 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun extern kprobe_opcode_t optinsn_slot; 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun /* Optinsn template address */ 37*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_entry[]; 38*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_op_address[]; 39*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_call_handler[]; 40*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_insn[]; 41*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_call_emulate[]; 42*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_ret[]; 43*4882a593Smuzhiyun extern kprobe_opcode_t optprobe_template_end[]; 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /* Fixed instruction size for powerpc */ 46*4882a593Smuzhiyun #define MAX_INSN_SIZE 2 47*4882a593Smuzhiyun #define MAX_OPTIMIZED_LENGTH sizeof(kprobe_opcode_t) /* 4 bytes */ 48*4882a593Smuzhiyun #define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry) 49*4882a593Smuzhiyun #define RELATIVEJUMP_SIZE sizeof(kprobe_opcode_t) /* 4 bytes */ 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun #define flush_insn_slot(p) do { } while (0) 52*4882a593Smuzhiyun #define kretprobe_blacklist_size 0 53*4882a593Smuzhiyun 54*4882a593Smuzhiyun void kretprobe_trampoline(void); 55*4882a593Smuzhiyun extern void arch_remove_kprobe(struct kprobe *p); 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun /* Architecture specific copy of original instruction */ 58*4882a593Smuzhiyun struct arch_specific_insn { 59*4882a593Smuzhiyun /* copy of original instruction */ 60*4882a593Smuzhiyun kprobe_opcode_t *insn; 61*4882a593Smuzhiyun /* 62*4882a593Smuzhiyun * Set in kprobes code, initially to 0. If the instruction can be 63*4882a593Smuzhiyun * eumulated, this is set to 1, if not, to -1. 64*4882a593Smuzhiyun */ 65*4882a593Smuzhiyun int boostable; 66*4882a593Smuzhiyun }; 67*4882a593Smuzhiyun 68*4882a593Smuzhiyun struct prev_kprobe { 69*4882a593Smuzhiyun struct kprobe *kp; 70*4882a593Smuzhiyun unsigned long status; 71*4882a593Smuzhiyun unsigned long saved_msr; 72*4882a593Smuzhiyun }; 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun /* per-cpu kprobe control block */ 75*4882a593Smuzhiyun struct kprobe_ctlblk { 76*4882a593Smuzhiyun unsigned long kprobe_status; 77*4882a593Smuzhiyun unsigned long kprobe_saved_msr; 78*4882a593Smuzhiyun struct prev_kprobe prev_kprobe; 79*4882a593Smuzhiyun }; 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun struct arch_optimized_insn { 82*4882a593Smuzhiyun kprobe_opcode_t copied_insn[1]; 83*4882a593Smuzhiyun /* detour buffer */ 84*4882a593Smuzhiyun kprobe_opcode_t *insn; 85*4882a593Smuzhiyun }; 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun extern int kprobe_exceptions_notify(struct notifier_block *self, 88*4882a593Smuzhiyun unsigned long val, void *data); 89*4882a593Smuzhiyun extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 90*4882a593Smuzhiyun extern int kprobe_handler(struct pt_regs *regs); 91*4882a593Smuzhiyun extern int kprobe_post_handler(struct pt_regs *regs); 92*4882a593Smuzhiyun #else kprobe_handler(struct pt_regs * regs)93*4882a593Smuzhiyunstatic inline int kprobe_handler(struct pt_regs *regs) { return 0; } kprobe_post_handler(struct pt_regs * regs)94*4882a593Smuzhiyunstatic inline int kprobe_post_handler(struct pt_regs *regs) { return 0; } 95*4882a593Smuzhiyun #endif /* CONFIG_KPROBES */ 96*4882a593Smuzhiyun #endif /* __KERNEL__ */ 97*4882a593Smuzhiyun #endif /* _ASM_POWERPC_KPROBES_H */ 98