4 * Kernel Probes (KProbes)
5 * include/asm-x86_64/kprobes.h
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 * Copyright (C) IBM Corporation, 2002, 2004
23 * 2004-Oct Prasanna S Panchamukhi <prasanna@in.ibm.com> and Jim Keniston
24 * kenistoj@us.ibm.com adopted from i386.
26 #include <linux/types.h>
27 #include <linux/ptrace.h>
28 #include <linux/percpu.h>
32 typedef u8 kprobe_opcode_t;
33 #define BREAKPOINT_INSTRUCTION 0xcc
34 #define MAX_INSN_SIZE 15
35 #define MAX_STACK_SIZE 64
36 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
37 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
39 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
41 #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)pentry
42 #define ARCH_SUPPORTS_KRETPROBES
44 void kretprobe_trampoline(void);
46 /* Architecture specific copy of original instruction*/
47 struct arch_specific_insn {
48 /* copy of the original instruction */
49 kprobe_opcode_t *insn;
55 unsigned long old_rflags;
56 unsigned long saved_rflags;
59 /* per-cpu kprobe control block */
60 struct kprobe_ctlblk {
61 unsigned long kprobe_status;
62 unsigned long kprobe_old_rflags;
63 unsigned long kprobe_saved_rflags;
64 long *jprobe_saved_rsp;
65 struct pt_regs jprobe_saved_regs;
66 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
67 struct prev_kprobe prev_kprobe;
70 /* trap3/1 are intr gates for kprobes. So, restore the status of IF,
71 * if necessary, before executing the original int3/1 (trap) handler.
73 static inline void restore_interrupts(struct pt_regs *regs)
75 if (regs->eflags & IF_MASK)
79 extern int post_kprobe_handler(struct pt_regs *regs);
80 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
81 extern int kprobe_handler(struct pt_regs *regs);
83 extern int kprobe_exceptions_notify(struct notifier_block *self,
84 unsigned long val, void *data);
85 #endif /* _ASM_KPROBES_H */