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
  29 struct pt_regs;
  30 struct kprobe;
  31
  32 typedef ppc_opcode_t kprobe_opcode_t;
  33
  34 extern kprobe_opcode_t optinsn_slot;
  35
  36 /* Optinsn template address */
  37 extern kprobe_opcode_t optprobe_template_entry[];
  38 extern kprobe_opcode_t optprobe_template_op_address[];
  39 extern kprobe_opcode_t optprobe_template_call_handler[];
  40 extern kprobe_opcode_t optprobe_template_insn[];
  41 extern kprobe_opcode_t optprobe_template_call_emulate[];
  42 extern kprobe_opcode_t optprobe_template_ret[];
  43 extern kprobe_opcode_t optprobe_template_end[];
  44
  45 /* Fixed instruction size for powerpc */
  46 #define MAX_INSN_SIZE           1
  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
  54 void kretprobe_trampoline(void);
  55 extern void arch_remove_kprobe(struct kprobe *p);
  56
  57 /* Architecture specific copy of original instruction */
  58 struct 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
  68 struct prev_kprobe {
  69         struct kprobe *kp;
  70         unsigned long status;
  71         unsigned long saved_msr;
  72 };
  73
  74 /* per-cpu kprobe control block */
  75 struct kprobe_ctlblk {
  76         unsigned long kprobe_status;
  77         unsigned long kprobe_saved_msr;
  78         struct prev_kprobe prev_kprobe;
  79 };
  80
  81 struct arch_optimized_insn {
  82         kprobe_opcode_t copied_insn[1];
  83         /* detour buffer */
  84         kprobe_opcode_t *insn;
  85 };
  86
  87 extern int kprobe_exceptions_notify(struct notifier_block *self,
  88                                         unsigned long val, void *data);
  89 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  90 extern int kprobe_handler(struct pt_regs *regs);
  91 extern int kprobe_post_handler(struct pt_regs *regs);
  92 #else
  93 static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
  94 static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
  95 #endif /* CONFIG_KPROBES */
  96 #endif /* __KERNEL__ */
  97 #endif  /* _ASM_POWERPC_KPROBES_H */