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 <vamsi_krishna@in.ibm.com> Kernel
23 * Probes initial implementation ( includes suggestions from
24 * Rusty Russell).
25 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
26 * <ananth@in.ibm.com>
27 * 2005-Dec Used as a template for s390 by Mike Grundy
28 * <grundym@us.ibm.com>
29 */
30 #include <linux/types.h>
31 #include <linux/ptrace.h>
32 #include <linux/percpu.h>
33
34 #define __ARCH_WANT_KPROBES_INSN_SLOT
35
36 struct pt_regs;
37 struct kprobe;
38
39 typedef u16 kprobe_opcode_t;
40 #define BREAKPOINT_INSTRUCTION 0x0002
41
42 /* Maximum instruction size is 3 (16bit) halfwords: */
43 #define MAX_INSN_SIZE 0x0003
44 #define MAX_STACK_SIZE 64
45 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
46 (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
47 ? (MAX_STACK_SIZE) \
48 : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
49
50 #define kretprobe_blacklist_size 0
51
52 #define KPROBE_SWAP_INST 0x10
53
54 #define FIXUP_PSW_NORMAL 0x08
55 #define FIXUP_BRANCH_NOT_TAKEN 0x04
56 #define FIXUP_RETURN_REGISTER 0x02
57 #define FIXUP_NOT_REQUIRED 0x01
58
59 /* Architecture specific copy of original instruction */
60 struct arch_specific_insn {
61 /* copy of original instruction */
62 kprobe_opcode_t *insn;
63 unsigned int is_ftrace_insn : 1;
64 };
65
66 struct prev_kprobe {
67 struct kprobe *kp;
68 unsigned long status;
69 };
70
71 /* per-cpu kprobe control block */
72 struct kprobe_ctlblk {
73 unsigned long kprobe_status;
74 unsigned long kprobe_saved_imask;
75 unsigned long kprobe_saved_ctl[3];
76 struct prev_kprobe prev_kprobe;
77 struct pt_regs jprobe_saved_regs;
78 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
79 };
80
81 void arch_remove_kprobe(struct kprobe *p);
82 void kretprobe_trampoline(void);
83
84 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
85 int kprobe_exceptions_notify(struct notifier_block *self,
86 unsigned long val, void *data);
87
88 int probe_is_prohibited_opcode(u16 *insn);
89 int probe_get_fixup_type(u16 *insn);
90 int probe_is_insn_relative_long(u16 *insn);
91
92 #define flush_insn_slot(p) do { } while (0)
93
94 #endif /* _ASM_S390_KPROBES_H */
95
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