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 28 #define __ARCH_WANT_KPROBES_INSN_SLOT 29 30 struct pt_regs; 31 struct kprobe; 32 33 typedef u8 kprobe_opcode_t; 34 #define BREAKPOINT_INSTRUCTION 0xcc 35 #define RELATIVEJUMP_INSTRUCTION 0xe9 36 #define MAX_INSN_SIZE 16 37 #define MAX_STACK_SIZE 64 38 #define MIN_STACK_SIZE(ADDR) \ 39 (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \ 40 THREAD_SIZE - (unsigned long)(ADDR))) \ 41 ? (MAX_STACK_SIZE) \ 42 : (((unsigned long)current_thread_info()) + \ 43 THREAD_SIZE - (unsigned long)(ADDR))) 44 45 #define flush_insn_slot(p) do { } while (0) 46 47 extern const int kretprobe_blacklist_size; 48 49 void arch_remove_kprobe(struct kprobe *p); 50 void kretprobe_trampoline(void); 51 52 /* Architecture specific copy of original instruction*/ 53 struct arch_specific_insn { 54 /* copy of the original instruction */ 55 kprobe_opcode_t *insn; 56 /* 57 * boostable = -1: This instruction type is not boostable. 58 * boostable = 0: This instruction type is boostable. 59 * boostable = 1: This instruction has been boosted: we have 60 * added a relative jump after the instruction copy in insn, 61 * so no single-step and fixup are needed (unless there's 62 * a post_handler or break_handler). 63 */ 64 int boostable; 65 }; 66 67 struct prev_kprobe { 68 struct kprobe *kp; 69 unsigned long status; 70 unsigned long old_flags; 71 unsigned long saved_flags; 72 }; 73 74 /* per-cpu kprobe control block */ 75 struct kprobe_ctlblk { 76 unsigned long kprobe_status; 77 unsigned long kprobe_old_flags; 78 unsigned long kprobe_saved_flags; 79 unsigned long *jprobe_saved_sp; 80 struct pt_regs jprobe_saved_regs; 81 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 82 struct prev_kprobe prev_kprobe; 83 }; 84 85 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 86 extern int kprobe_exceptions_notify(struct notifier_block *self, 87 unsigned long val, void *data); 88 #endif /* _ASM_X86_KPROBES_H */ 89