Line data    Source code

       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 = 0: This instruction type is not boostable.
      62             :          * boostable = 1: 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             :         unsigned boostable:1;
      68             :         unsigned if_modifier:1;
      69             :         unsigned is_call:1;
      70             :         unsigned is_pushf:1;
      71             :         unsigned is_abs_ip:1;
      72             :         /* Number of bytes of text poked */
      73             :         int tp_len;
      74             : };
      75             : 
      76             : struct arch_optimized_insn {
      77             :         /* copy of the original instructions */
      78             :         kprobe_opcode_t copied_insn[DISP32_SIZE];
      79             :         /* detour code buffer */
      80             :         kprobe_opcode_t *insn;
      81             :         /* the size of instructions copied to detour code buffer */
      82             :         size_t size;
      83             : };
      84             : 
      85             : /* Return true (!0) if optinsn is prepared for optimization. */
      86             : static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
      87             : {
      88             :         return optinsn->size;
      89             : }
      90             : 
      91             : struct prev_kprobe {
      92             :         struct kprobe *kp;
      93             :         unsigned long status;
      94             :         unsigned long old_flags;
      95             :         unsigned long saved_flags;
      96             : };
      97             : 
      98             : /* per-cpu kprobe control block */
      99             : struct kprobe_ctlblk {
     100             :         unsigned long kprobe_status;
     101             :         unsigned long kprobe_old_flags;
     102             :         unsigned long kprobe_saved_flags;
     103             :         struct prev_kprobe prev_kprobe;
     104             : };
     105             : 
     106             : extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
     107             : extern int kprobe_exceptions_notify(struct notifier_block *self,
     108             :                                     unsigned long val, void *data);
     109             : extern int kprobe_int3_handler(struct pt_regs *regs);
     110             : extern int kprobe_debug_handler(struct pt_regs *regs);
     111             : 
     112             : #else
     113             : 
     114           0 : static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; }
     115             : 
     116             : #endif /* CONFIG_KPROBES */
     117             : #endif /* _ASM_X86_KPROBES_H */