text: /* SPDX-License-Identifier: GPL-2.0-or-later */
  #ifndef _ASM_POWERPC_KPROBES_H
  #define _ASM_POWERPC_KPROBES_H
  
  #include <asm-generic/kprobes.h>
  
  #ifdef __KERNEL__
  /*
   *  Kernel Probes (KProbes)
   *
   * Copyright (C) IBM Corporation, 2002, 2004
   *
   * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
   *		Probes initial implementation ( includes suggestions from
   *		Rusty Russell).
   * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
   *		<ananth@in.ibm.com>
   */
  #include <linux/types.h>
  #include <linux/ptrace.h>
  #include <linux/percpu.h>
  #include <linux/module.h>
  #include <asm/probes.h>
  #include <asm/code-patching.h>
  
  #ifdef CONFIG_KPROBES
  #define  __ARCH_WANT_KPROBES_INSN_SLOT
  
  struct pt_regs;
  struct kprobe;
  
  typedef ppc_opcode_t kprobe_opcode_t;
  
  extern kprobe_opcode_t optinsn_slot;
  
  /* Optinsn template address */
  extern kprobe_opcode_t optprobe_template_entry[];
  extern kprobe_opcode_t optprobe_template_op_address[];
  extern kprobe_opcode_t optprobe_template_call_handler[];
  extern kprobe_opcode_t optprobe_template_insn[];
  extern kprobe_opcode_t optprobe_template_call_emulate[];
  extern kprobe_opcode_t optprobe_template_ret[];
  extern kprobe_opcode_t optprobe_template_end[];
  
  /* Fixed instruction size for powerpc */
  #define MAX_INSN_SIZE		1
  #define MAX_OPTIMIZED_LENGTH	sizeof(kprobe_opcode_t)	/* 4 bytes */
  #define MAX_OPTINSN_SIZE	(optprobe_template_end - optprobe_template_entry)
  #define RELATIVEJUMP_SIZE	sizeof(kprobe_opcode_t)	/* 4 bytes */
  
  #define flush_insn_slot(p)	do { } while (0)
  #define kretprobe_blacklist_size 0
  
  void kretprobe_trampoline(void);
  extern void arch_remove_kprobe(struct kprobe *p);
  
  /* Architecture specific copy of original instruction */
  struct arch_specific_insn {
  	/* copy of original instruction */
  	kprobe_opcode_t *insn;
  	/*
  	 * Set in kprobes code, initially to 0. If the instruction can be
  	 * eumulated, this is set to 1, if not, to -1.
  	 */
  	int boostable;
  };
  
  struct prev_kprobe {
  	struct kprobe *kp;
  	unsigned long status;
  	unsigned long saved_msr;
  };
  
  /* per-cpu kprobe control block */
  struct kprobe_ctlblk {
  	unsigned long kprobe_status;
  	unsigned long kprobe_saved_msr;
  	struct prev_kprobe prev_kprobe;
  };
  
  struct arch_optimized_insn {
  	kprobe_opcode_t copied_insn[1];
  	/* detour buffer */
  	kprobe_opcode_t *insn;
  };
  
  extern int kprobe_exceptions_notify(struct notifier_block *self,
  					unsigned long val, void *data);
  extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  extern int kprobe_handler(struct pt_regs *regs);
  extern int kprobe_post_handler(struct pt_regs *regs);
  #else
  static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
  static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
  #endif /* CONFIG_KPROBES */
  #endif /* __KERNEL__ */
  #endif	/* _ASM_POWERPC_KPROBES_H */
  