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 23struct pt_regs; 24struct kprobe; 25 26typedef 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 */ 38extern __visible kprobe_opcode_t optprobe_template_entry[]; 39extern __visible kprobe_opcode_t optprobe_template_clac[]; 40extern __visible kprobe_opcode_t optprobe_template_val[]; 41extern __visible kprobe_opcode_t optprobe_template_call[]; 42extern __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 49extern const int kretprobe_blacklist_size; 50 51void arch_remove_kprobe(struct kprobe *p); 52 53/* Architecture specific copy of original instruction*/ 54struct arch_specific_insn { 55 /* copy of the original instruction */ 56 kprobe_opcode_t *insn; 57 /* 58 * boostable = 0: This instruction type is not boostable. 59 * boostable = 1: This instruction has been boosted: we have 60 * added a relative jump after the instruction copy in insn, 61 * so no single-step and fixup are needed (unless there's 62 * a post_handler). 63 */ 64 unsigned boostable:1; 65 unsigned char size; /* The size of insn */ 66 union { 67 unsigned char opcode; 68 struct { 69 unsigned char type; 70 } jcc; 71 struct { 72 unsigned char type; 73 unsigned char asize; 74 } loop; 75 struct { 76 unsigned char reg; 77 } indirect; 78 }; 79 s32 rel32; /* relative offset must be s32, s16, or s8 */ 80 void (*emulate_op)(struct kprobe *p, struct pt_regs *regs); 81 /* Number of bytes of text poked */ 82 int tp_len; 83}; 84 85struct arch_optimized_insn { 86 /* copy of the original instructions */ 87 kprobe_opcode_t copied_insn[DISP32_SIZE]; 88 /* detour code buffer */ 89 kprobe_opcode_t *insn; 90 /* the size of instructions copied to detour code buffer */ 91 size_t size; 92}; 93 94/* Return true (!0) if optinsn is prepared for optimization. */ 95static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) 96{ 97 return optinsn->size; 98} 99 100struct prev_kprobe { 101 struct kprobe *kp; 102 unsigned long status; 103 unsigned long old_flags; 104 unsigned long saved_flags; 105}; 106 107/* per-cpu kprobe control block */ 108struct kprobe_ctlblk { 109 unsigned long kprobe_status; 110 unsigned long kprobe_old_flags; 111 unsigned long kprobe_saved_flags; 112 struct prev_kprobe prev_kprobe; 113}; 114 115extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 116extern int kprobe_int3_handler(struct pt_regs *regs); 117 118#else 119 120static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; } 121 122#endif /* CONFIG_KPROBES */ 123#endif /* _ASM_X86_KPROBES_H */ 124