LXR linux/arch/powerpc/include/asm/kprobes.h

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