arch/x86/include/asm/kprobes.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _ASM_X86_KPROBES_H
   3 #define _ASM_X86_KPROBES_H
   4 /*
   5  *  Kernel Probes (KProbes)
   6  *
   7  * Copyright (C) IBM Corporation, 2002, 2004
   8  *
   9  * See arch/x86/kernel/kprobes.c for x86 kprobes history.
  10  */
  11
  12 #include <asm-generic/kprobes.h>
  13
  14 #ifdef CONFIG_KPROBES
  15 #include <linux/types.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/percpu.h>
  18 #include <asm/text-patching.h>
  19 #include <asm/insn.h>
  20
  21 #define  __ARCH_WANT_KPROBES_INSN_SLOT
  22
  23 struct pt_regs;
  24 struct kprobe;
  25
  26 typedef u8 kprobe_opcode_t;
  27
  28 #define MAX_STACK_SIZE 64
  29 #define CUR_STACK_SIZE(ADDR) \
  30         (current_top_of_stack() - (unsigned long)(ADDR))
  31 #define MIN_STACK_SIZE(ADDR)                            \
  32         (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ?        \
  33          MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR))
  34
  35 #define flush_insn_slot(p)      do { } while (0)
  36
  37 /* optinsn template addresses */
  38 extern __visible kprobe_opcode_t optprobe_template_entry[];
  39 extern __visible kprobe_opcode_t optprobe_template_clac[];
  40 extern __visible kprobe_opcode_t optprobe_template_val[];
  41 extern __visible kprobe_opcode_t optprobe_template_call[];
  42 extern __visible kprobe_opcode_t optprobe_template_end[];
  43 #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + DISP32_SIZE)
  44 #define MAX_OPTINSN_SIZE                                \
  45         (((unsigned long)optprobe_template_end -        \
  46           (unsigned long)optprobe_template_entry) +     \
  47          MAX_OPTIMIZED_LENGTH + JMP32_INSN_SIZE)
  48
  49 extern const int kretprobe_blacklist_size;
  50
  51 void arch_remove_kprobe(struct kprobe *p);
  52 asmlinkage void kretprobe_trampoline(void);
  53
  54 extern void arch_kprobe_override_function(struct pt_regs *regs);
  55
  56 /* Architecture specific copy of original instruction*/
  57 struct arch_specific_insn {
  58         /* copy of the original instruction */
  59         kprobe_opcode_t *insn;
  60         /*
  61          * boostable = false: This instruction type is not boostable.
  62          * boostable = true: This instruction has been boosted: we have
  63          * added a relative jump after the instruction copy in insn,
  64          * so no single-step and fixup are needed (unless there's
  65          * a post_handler).
  66          */
  67         bool boostable;
  68         bool if_modifier;
  69 };
  70
  71 struct arch_optimized_insn {
  72         /* copy of the original instructions */
  73         kprobe_opcode_t copied_insn[DISP32_SIZE];
  74         /* detour code buffer */
  75         kprobe_opcode_t *insn;
  76         /* the size of instructions copied to detour code buffer */
  77         size_t size;
  78 };
  79
  80 /* Return true (!0) if optinsn is prepared for optimization. */
  81 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
  82 {
  83         return optinsn->size;
  84 }
  85
  86 struct prev_kprobe {
  87         struct kprobe *kp;
  88         unsigned long status;
  89         unsigned long old_flags;
  90         unsigned long saved_flags;
  91 };
  92
  93 /* per-cpu kprobe control block */
  94 struct kprobe_ctlblk {
  95         unsigned long kprobe_status;
  96         unsigned long kprobe_old_flags;
  97         unsigned long kprobe_saved_flags;
  98         struct prev_kprobe prev_kprobe;
  99 };
 100
 101 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 102 extern int kprobe_exceptions_notify(struct notifier_block *self,
 103                                     unsigned long val, void *data);
 104 extern int kprobe_int3_handler(struct pt_regs *regs);
 105 extern int kprobe_debug_handler(struct pt_regs *regs);
 106
 107 #endif /* CONFIG_KPROBES */
 108 #endif /* _ASM_X86_KPROBES_H */