1 #ifndef _ASM_X86_KPROBES_H 2 #define _ASM_X86_KPROBES_H 3 /* 4 * Kernel Probes (KProbes) 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 * 20 * Copyright (C) IBM Corporation, 2002, 2004 21 * 22 * See arch/x86/kernel/kprobes.c for x86 kprobes history. 23 */ 24 #include <linux/types.h> 25 #include <linux/ptrace.h> 26 #include <linux/percpu.h> 27 #include <asm/insn.h> 28 29 #define __ARCH_WANT_KPROBES_INSN_SLOT 30 31 struct pt_regs; 32 struct kprobe; 33 34 typedef u8 kprobe_opcode_t; 35 #define BREAKPOINT_INSTRUCTION 0xcc 36 #define RELATIVEJUMP_OPCODE 0xe9 37 #define RELATIVEJUMP_SIZE 5 38 #define RELATIVECALL_OPCODE 0xe8 39 #define RELATIVE_ADDR_SIZE 4 40 #define MAX_STACK_SIZE 64 41 #define MIN_STACK_SIZE(ADDR) \ 42 (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \ 43 THREAD_SIZE - (unsigned long)(ADDR))) \ 44 ? (MAX_STACK_SIZE) \ 45 : (((unsigned long)current_thread_info()) + \ 46 THREAD_SIZE - (unsigned long)(ADDR))) 47 48 #define flush_insn_slot(p) do { } while (0) 49 50 /* optinsn template addresses */ 51 extern __visible kprobe_opcode_t optprobe_template_entry; 52 extern __visible kprobe_opcode_t optprobe_template_val; 53 extern __visible kprobe_opcode_t optprobe_template_call; 54 extern __visible kprobe_opcode_t optprobe_template_end; 55 #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) 56 #define MAX_OPTINSN_SIZE \ 57 (((unsigned long)&optprobe_template_end - \ 58 (unsigned long)&optprobe_template_entry) + \ 59 MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) 60 61 extern const int kretprobe_blacklist_size; 62 63 void arch_remove_kprobe(struct kprobe *p); 64 asmlinkage void kretprobe_trampoline(void); 65 66 /* Architecture specific copy of original instruction*/ 67 struct arch_specific_insn { 68 /* copy of the original instruction */ 69 kprobe_opcode_t *insn; 70 /* 71 * boostable = -1: This instruction type is not boostable. 72 * boostable = 0: This instruction type is boostable. 73 * boostable = 1: This instruction has been boosted: we have 74 * added a relative jump after the instruction copy in insn, 75 * so no single-step and fixup are needed (unless there's 76 * a post_handler or break_handler). 77 */ 78 int boostable; 79 bool if_modifier; 80 }; 81 82 struct arch_optimized_insn { 83 /* copy of the original instructions */ 84 kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE]; 85 /* detour code buffer */ 86 kprobe_opcode_t *insn; 87 /* the size of instructions copied to detour code buffer */ 88 size_t size; 89 }; 90 91 /* Return true (!0) if optinsn is prepared for optimization. */ 92 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) 93 { 94 return optinsn->size; 95 } 96 97 struct prev_kprobe { 98 struct kprobe *kp; 99 unsigned long status; 100 unsigned long old_flags; 101 unsigned long saved_flags; 102 }; 103 104 /* per-cpu kprobe control block */ 105 struct kprobe_ctlblk { 106 unsigned long kprobe_status; 107 unsigned long kprobe_old_flags; 108 unsigned long kprobe_saved_flags; 109 unsigned long *jprobe_saved_sp; 110 struct pt_regs jprobe_saved_regs; 111 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 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 extern int kprobe_debug_handler(struct pt_regs *regs); 120 #endif /* _ASM_X86_KPROBES_H */ 121