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 25 #include <asm-generic/kprobes.h> 26 27 #define BREAKPOINT_INSTRUCTION 0xcc 28 29 #ifdef CONFIG_KPROBES 30 #include <linux/types.h> 31 #include <linux/ptrace.h> 32 #include <linux/percpu.h> 33 #include <asm/insn.h> 34 35 #define __ARCH_WANT_KPROBES_INSN_SLOT 36 37 struct pt_regs; 38 struct kprobe; 39 40 typedef u8 kprobe_opcode_t; 41 #define RELATIVEJUMP_OPCODE 0xe9 42 #define RELATIVEJUMP_SIZE 5 43 #define RELATIVECALL_OPCODE 0xe8 44 #define RELATIVE_ADDR_SIZE 4 45 #define MAX_STACK_SIZE 64 46 #define CUR_STACK_SIZE(ADDR) \ 47 (current_top_of_stack() - (unsigned long)(ADDR)) 48 #define MIN_STACK_SIZE(ADDR) \ 49 (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \ 50 MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR)) 51 52 #define flush_insn_slot(p) do { } while (0) 53 54 /* optinsn template addresses */ 55 extern __visible kprobe_opcode_t optprobe_template_entry[]; 56 extern __visible kprobe_opcode_t optprobe_template_val[]; 57 extern __visible kprobe_opcode_t optprobe_template_call[]; 58 extern __visible kprobe_opcode_t optprobe_template_end[]; 59 #define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) 60 #define MAX_OPTINSN_SIZE \ 61 (((unsigned long)&optprobe_template_end - \ 62 (unsigned long)&optprobe_template_entry) + \ 63 MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) 64 65 extern const int kretprobe_blacklist_size; 66 67 void arch_remove_kprobe(struct kprobe *p); 68 asmlinkage void kretprobe_trampoline(void); 69 70 /* Architecture specific copy of original instruction*/ 71 struct arch_specific_insn { 72 /* copy of the original instruction */ 73 kprobe_opcode_t *insn; 74 /* 75 * boostable = false: This instruction type is not boostable. 76 * boostable = true: This instruction has been boosted: we have 77 * added a relative jump after the instruction copy in insn, 78 * so no single-step and fixup are needed (unless there's 79 * a post_handler or break_handler). 80 */ 81 bool boostable; 82 bool if_modifier; 83 }; 84 85 struct arch_optimized_insn { 86 /* copy of the original instructions */ 87 kprobe_opcode_t copied_insn[RELATIVE_ADDR_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. */ arch_prepared_optinsn(struct arch_optimized_insn * optinsn)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 unsigned long *jprobe_saved_sp; 113 struct pt_regs jprobe_saved_regs; 114 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 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 extern int kprobe_debug_handler(struct pt_regs *regs); 123 124 #endif /* CONFIG_KPROBES */ 125 #endif /* _ASM_X86_KPROBES_H */ 126