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 /* Number of bytes of text poked */ 70 int tp_len; 71 }; 72 73 struct arch_optimized_insn { 74 /* copy of the original instructions */ 75 kprobe_opcode_t copied_insn[DISP32_SIZE]; 76 /* detour code buffer */ 77 kprobe_opcode_t *insn; 78 /* the size of instructions copied to detour code buffer */ 79 size_t size; 80 }; 81 82 /* Return true (!0) if optinsn is prepared for optimization. */ 83 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) 84 { 85 return optinsn->size; 86 } 87 88 struct prev_kprobe { 89 struct kprobe *kp; 90 unsigned long status; 91 unsigned long old_flags; 92 unsigned long saved_flags; 93 }; 94 95 /* per-cpu kprobe control block */ 96 struct kprobe_ctlblk { 97 unsigned long kprobe_status; 98 unsigned long kprobe_old_flags; 99 unsigned long kprobe_saved_flags; 100 struct prev_kprobe prev_kprobe; 101 }; 102 103 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 104 extern int kprobe_exceptions_notify(struct notifier_block *self, 105 unsigned long val, void *data); 106 extern int kprobe_int3_handler(struct pt_regs *regs); 107 extern int kprobe_debug_handler(struct pt_regs *regs); 108 109 #else 110 111 static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; } 112 113 #endif /* CONFIG_KPROBES */ 114 #endif /* _ASM_X86_KPROBES_H */ 115