arch/arm/include/asm/kprobes.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * arch/arm/include/asm/kprobes.h
   4  *
   5  * Copyright (C) 2006, 2007 Motorola Inc.
   6  */
   7
   8 #ifndef _ARM_KPROBES_H
   9 #define _ARM_KPROBES_H
  10
  11 #include <asm-generic/kprobes.h>
  12
  13 #ifdef CONFIG_KPROBES
  14 #include <linux/types.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/notifier.h>
  17
  18 #define __ARCH_WANT_KPROBES_INSN_SLOT
  19 #define MAX_INSN_SIZE                   2
  20
  21 #define flush_insn_slot(p)              do { } while (0)
  22 #define kretprobe_blacklist_size        0
  23
  24 typedef u32 kprobe_opcode_t;
  25 struct kprobe;
  26 #include <asm/probes.h>
  27
  28 #define arch_specific_insn      arch_probes_insn
  29
  30 struct prev_kprobe {
  31         struct kprobe *kp;
  32         unsigned int status;
  33 };
  34
  35 /* per-cpu kprobe control block */
  36 struct kprobe_ctlblk {
  37         unsigned int kprobe_status;
  38         struct prev_kprobe prev_kprobe;
  39 };
  40
  41 void arch_remove_kprobe(struct kprobe *);
  42 int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);
  43 int kprobe_exceptions_notify(struct notifier_block *self,
  44                              unsigned long val, void *data);
  45
  46 /* optinsn template addresses */
  47 extern __visible kprobe_opcode_t optprobe_template_entry[];
  48 extern __visible kprobe_opcode_t optprobe_template_val[];
  49 extern __visible kprobe_opcode_t optprobe_template_call[];
  50 extern __visible kprobe_opcode_t optprobe_template_end[];
  51 extern __visible kprobe_opcode_t optprobe_template_sub_sp[];
  52 extern __visible kprobe_opcode_t optprobe_template_add_sp[];
  53 extern __visible kprobe_opcode_t optprobe_template_restore_begin[];
  54 extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn[];
  55 extern __visible kprobe_opcode_t optprobe_template_restore_end[];
  56
  57 #define MAX_OPTIMIZED_LENGTH    4
  58 #define MAX_OPTINSN_SIZE                                \
  59         ((unsigned long)optprobe_template_end - \
  60          (unsigned long)optprobe_template_entry)
  61 #define RELATIVEJUMP_SIZE       4
  62
  63 struct arch_optimized_insn {
  64         /*
  65          * copy of the original instructions.
  66          * Different from x86, ARM kprobe_opcode_t is u32.
  67          */
  68 #define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
  69         kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
  70         /* detour code buffer */
  71         kprobe_opcode_t *insn;
  72         /*
  73          * We always copy one instruction on ARM,
  74          * so size will always be 4, and unlike x86, there is no
  75          * need for a size field.
  76          */
  77 };
  78
  79 #endif /* CONFIG_KPROBES */
  80 #endif /* _ARM_KPROBES_H */