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 53 /* Architecture specific copy of original instruction*/ 54 struct 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 85 struct 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. */ 95 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) 96 { 97 return optinsn->size; 98 } 99 100 struct 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 */ 108 struct 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 }; 114 115 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 116 extern int kprobe_exceptions_notify(struct notifier_block *self, 117 unsigned long val, void *data); 118 extern int kprobe_int3_handler(struct pt_regs *regs); 119 120 #else 121 122 static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; } 123 124 #endif /* CONFIG_KPROBES */ 125 #endif /* _ASM_X86_KPROBES_H */ 126