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 CUR_STACK_SIZE(ADDR) \ 42 (current_top_of_stack() - (unsigned long)(ADDR)) 43 #define MIN_STACK_SIZE(ADDR) \ 44 (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \ 45 MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR)) 46 47 #define flush_insn_slot(p) do { } while (0) 48 49 /* optinsn template addresses */ 50 extern __visible kprobe_opcode_t optprobe_template_entry; 51 extern __visible kprobe_opcode_t optprobe_template_val; 52 extern __visible kprobe_opcode_t optprobe_template_call; 53 extern __visible kprobe_opcode_t optprobe_template_end; 54 #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) 55 #define MAX_OPTINSN_SIZE \ 56 (((unsigned long)&optprobe_template_end - \ 57 (unsigned long)&optprobe_template_entry) + \ 58 MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) 59 60 extern const int kretprobe_blacklist_size; 61 62 void arch_remove_kprobe(struct kprobe *p); 63 asmlinkage void kretprobe_trampoline(void); 64 65 /* Architecture specific copy of original instruction*/ 66 struct arch_specific_insn { 67 /* copy of the original instruction */ 68 kprobe_opcode_t *insn; 69 /* 70 * boostable = -1: This instruction type is not boostable. 71 * boostable = 0: This instruction type is boostable. 72 * boostable = 1: This instruction has been boosted: we have 73 * added a relative jump after the instruction copy in insn, 74 * so no single-step and fixup are needed (unless there's 75 * a post_handler or break_handler). 76 */ 77 int boostable; 78 bool if_modifier; 79 }; 80 81 struct arch_optimized_insn { 82 /* copy of the original instructions */ 83 kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE]; 84 /* detour code buffer */ 85 kprobe_opcode_t *insn; 86 /* the size of instructions copied to detour code buffer */ 87 size_t size; 88 }; 89 90 /* Return true (!0) if optinsn is prepared for optimization. */ 91 static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn) 92 { 93 return optinsn->size; 94 } 95 96 struct prev_kprobe { 97 struct kprobe *kp; 98 unsigned long status; 99 unsigned long old_flags; 100 unsigned long saved_flags; 101 }; 102 103 /* per-cpu kprobe control block */ 104 struct kprobe_ctlblk { 105 unsigned long kprobe_status; 106 unsigned long kprobe_old_flags; 107 unsigned long kprobe_saved_flags; 108 unsigned long *jprobe_saved_sp; 109 struct pt_regs jprobe_saved_regs; 110 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 111 struct prev_kprobe prev_kprobe; 112 }; 113 114 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 115 extern int kprobe_exceptions_notify(struct notifier_block *self, 116 unsigned long val, void *data); 117 extern int kprobe_int3_handler(struct pt_regs *regs); 118 extern int kprobe_debug_handler(struct pt_regs *regs); 119 #endif /* _ASM_X86_KPROBES_H */ 120