4 * Kernel Probes (KProbes)
5 * include/asm-i386/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 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
24 * Probes initial implementation ( includes suggestions from
27 #include <linux/types.h>
28 #include <linux/ptrace.h>
30 #define __ARCH_WANT_KPROBES_INSN_SLOT
35 typedef u8 kprobe_opcode_t
;
36 #define BREAKPOINT_INSTRUCTION 0xcc
37 #define RELATIVEJUMP_INSTRUCTION 0xe9
38 #define MAX_INSN_SIZE 16
39 #define MAX_STACK_SIZE 64
40 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
41 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
43 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
45 #define ARCH_SUPPORTS_KRETPROBES
46 #define flush_insn_slot(p) do { } while (0)
48 extern const int kretprobe_blacklist_size
;
50 void arch_remove_kprobe(struct kprobe
*p
);
51 void kretprobe_trampoline(void);
53 /* Architecture specific copy of original instruction*/
54 struct arch_specific_insn
{
55 /* copy of the original instruction */
56 kprobe_opcode_t
*insn
;
58 * If this flag is not 0, this kprobe can be boost when its
59 * post_handler and break_handler is not set.
67 unsigned long old_eflags
;
68 unsigned long saved_eflags
;
71 /* per-cpu kprobe control block */
72 struct kprobe_ctlblk
{
73 unsigned long kprobe_status
;
74 unsigned long kprobe_old_eflags
;
75 unsigned long kprobe_saved_eflags
;
76 unsigned long *jprobe_saved_esp
;
77 struct pt_regs jprobe_saved_regs
;
78 kprobe_opcode_t jprobes_stack
[MAX_STACK_SIZE
];
79 struct prev_kprobe prev_kprobe
;
82 /* trap3/1 are intr gates for kprobes. So, restore the status of IF,
83 * if necessary, before executing the original int3/1 (trap) handler.
85 static inline void restore_interrupts(struct pt_regs
*regs
)
87 if (regs
->eflags
& IF_MASK
)
91 extern int kprobe_exceptions_notify(struct notifier_block
*self
,
92 unsigned long val
, void *data
);
93 extern int kprobe_fault_handler(struct pt_regs
*regs
, int trapnr
);
94 #endif /* _ASM_KPROBES_H */