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kprobes.h
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1 #ifndef _ASM_S390_KPROBES_H
2 #define _ASM_S390_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 IBM Corp. 2002, 2006
21  *
22  * 2002-Oct Created by Vamsi Krishna S <[email protected]> Kernel
23  * Probes initial implementation ( includes suggestions from
24  * Rusty Russell).
25  * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
27  * 2005-Dec Used as a template for s390 by Mike Grundy
29  */
30 #include <linux/types.h>
31 #include <linux/ptrace.h>
32 #include <linux/percpu.h>
33 
34 struct pt_regs;
35 struct kprobe;
36 
37 typedef u16 kprobe_opcode_t;
38 #define BREAKPOINT_INSTRUCTION 0x0002
39 
40 /* Maximum instruction size is 3 (16bit) halfwords: */
41 #define MAX_INSN_SIZE 0x0003
42 #define MAX_STACK_SIZE 64
43 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
44  (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
45  ? (MAX_STACK_SIZE) \
46  : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
47 
48 #define kretprobe_blacklist_size 0
49 
50 #define KPROBE_SWAP_INST 0x10
51 
52 #define FIXUP_PSW_NORMAL 0x08
53 #define FIXUP_BRANCH_NOT_TAKEN 0x04
54 #define FIXUP_RETURN_REGISTER 0x02
55 #define FIXUP_NOT_REQUIRED 0x01
56 
57 /* Architecture specific copy of original instruction */
58 struct arch_specific_insn {
59  /* copy of original instruction */
61 };
62 
63 struct prev_kprobe {
64  struct kprobe *kp;
65  unsigned long status;
66 };
67 
68 /* per-cpu kprobe control block */
69 struct kprobe_ctlblk {
70  unsigned long kprobe_status;
71  unsigned long kprobe_saved_imask;
72  unsigned long kprobe_saved_ctl[3];
73  struct prev_kprobe prev_kprobe;
76 };
77 
78 void arch_remove_kprobe(struct kprobe *p);
79 void kretprobe_trampoline(void);
80 
81 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
83  unsigned long val, void *data);
84 
85 #define flush_insn_slot(p) do { } while (0)
86 
87 #endif /* _ASM_S390_KPROBES_H */