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 char size; /* The size of insn */ 69 union { 70 unsigned char opcode; 71 struct { 72 unsigned char type; 73 } jcc; 74 struct { 75 unsigned char type; 76 unsigned char asize; 77 } loop; 78 struct { 79 unsigned char reg; 80 } indirect; 81 }; 82 s32 rel32; /* relative offset must be s32, s16, or s8 */ 83 void (*emulate_op)(struct kprobe *p, struct pt_regs *regs); 84 /* Number of bytes of text poked */ 85 int tp_len; 86 }; 87 88 struct arch_optimized_insn { 89 /* copy of the original instructions */ 90 kprobe_opcode_t copied_insn[DISP32_SIZE]; 91 /* detour code buffer */ 92 kprobe_opcode_t *insn; 93 /* the size of instructions copied to detour code buffer */ 94 size_t size; 95 }; 96 97 /* Return true (!0) if optinsn is prepared for optimization. */ 98 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) 99 { 100 return optinsn->size; 101 } 102 103 struct prev_kprobe { 104 struct kprobe *kp; 105 unsigned long status; 106 unsigned long old_flags; 107 unsigned long saved_flags; 108 }; 109 110 /* per-cpu kprobe control block */ 111 struct kprobe_ctlblk { 112 unsigned long kprobe_status; 113 unsigned long kprobe_old_flags; 114 unsigned long kprobe_saved_flags; 115 struct prev_kprobe prev_kprobe; 116 }; 117 118 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 119 extern int kprobe_exceptions_notify(struct notifier_block *self, 120 unsigned long val, void *data); 121 extern int kprobe_int3_handler(struct pt_regs *regs); 122 123 #else 124 125 static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; } 126 127 #endif /* CONFIG_KPROBES */ 128 #endif /* _ASM_X86_KPROBES_H */ 129