#ifndef _ASM_KPROBES_H #define _ASM_KPROBES_H /* * Kernel Probes (KProbes) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Copyright (C) IBM Corporation, 2002, 2004 * * See arch/x86/kernel/kprobes.c for x86 kprobes history. */ #include <linux/types.h> #include <linux/ptrace.h> #include <linux/percpu.h> #define __ARCH_WANT_KPROBES_INSN_SLOT struct pt_regs; struct kprobe; typedef u8 kprobe_opcode_t; #define BREAKPOINT_INSTRUCTION 0xcc #define RELATIVEJUMP_INSTRUCTION 0xe9 #define MAX_INSN_SIZE 16 #define MAX_STACK_SIZE 64 #define MIN_STACK_SIZE(ADDR) \ (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \ THREAD_SIZE - (unsigned long)(ADDR))) \ ? (MAX_STACK_SIZE) \ : (((unsigned long)current_thread_info()) + \ THREAD_SIZE - (unsigned long)(ADDR))) #define flush_insn_slot(p) do { } while (0) extern const int kretprobe_blacklist_size; void arch_remove_kprobe(struct kprobe *p); void kretprobe_trampoline(void); /* Architecture specific copy of original instruction*/ struct arch_specific_insn { /* copy of the original instruction */ kprobe_opcode_t *insn; /* * boostable = -1: This instruction type is not boostable. * boostable = 0: This instruction type is boostable. * boostable = 1: This instruction has been boosted: we have * added a relative jump after the instruction copy in insn, * so no single-step and fixup are needed (unless there's * a post_handler or break_handler). */ int boostable; }; struct prev_kprobe { struct kprobe *kp; unsigned long status; unsigned long old_flags; unsigned long saved_flags; }; /* per-cpu kprobe control block */ struct kprobe_ctlblk { unsigned long kprobe_status; unsigned long kprobe_old_flags; unsigned long kprobe_saved_flags; unsigned long *jprobe_saved_sp; struct pt_regs jprobe_saved_regs; kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; struct prev_kprobe prev_kprobe; }; /* trap3/1 are intr gates for kprobes. So, restore the status of IF, * if necessary, before executing the original int3/1 (trap) handler. */ static inline void restore_interrupts(struct pt_regs *regs) { if (regs->flags & X86_EFLAGS_IF) local_irq_enable(); } extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); extern int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data); #endif /* _ASM_KPROBES_H */