v2.6.22.24-op1
[linux-2.6.22.y-op.git] / include / asm-s390 / kprobes.h
blob830fe4c4eea60a529975b7d78abc98388466fc88
1 #ifndef _ASM_S390_KPROBES_H
2 #define _ASM_S390_KPROBES_H
3 /*
4 * Kernel Probes (KProbes)
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.
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.
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.
20 * Copyright (C) IBM Corporation, 2002, 2006
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>
30 #include <linux/types.h>
31 #include <linux/ptrace.h>
32 #include <linux/percpu.h>
34 #define __ARCH_WANT_KPROBES_INSN_SLOT
35 struct pt_regs;
36 struct kprobe;
38 typedef u16 kprobe_opcode_t;
39 #define BREAKPOINT_INSTRUCTION 0x0002
41 /* Maximum instruction size is 3 (16bit) halfwords: */
42 #define MAX_INSN_SIZE 0x0003
43 #define MAX_STACK_SIZE 64
44 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
45 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
46 ? (MAX_STACK_SIZE) \
47 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
49 #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
51 #define ARCH_SUPPORTS_KRETPROBES
52 #define ARCH_INACTIVE_KPROBE_COUNT 0
54 #define KPROBE_SWAP_INST 0x10
56 #define FIXUP_PSW_NORMAL 0x08
57 #define FIXUP_BRANCH_NOT_TAKEN 0x04
58 #define FIXUP_RETURN_REGISTER 0x02
59 #define FIXUP_NOT_REQUIRED 0x01
61 /* Architecture specific copy of original instruction */
62 struct arch_specific_insn {
63 /* copy of original instruction */
64 kprobe_opcode_t *insn;
65 int fixup;
66 int ilen;
67 int reg;
70 struct ins_replace_args {
71 kprobe_opcode_t *ptr;
72 kprobe_opcode_t old;
73 kprobe_opcode_t new;
75 struct prev_kprobe {
76 struct kprobe *kp;
77 unsigned long status;
78 unsigned long saved_psw;
79 unsigned long kprobe_saved_imask;
80 unsigned long kprobe_saved_ctl[3];
83 /* per-cpu kprobe control block */
84 struct kprobe_ctlblk {
85 unsigned long kprobe_status;
86 unsigned long kprobe_saved_imask;
87 unsigned long kprobe_saved_ctl[3];
88 struct pt_regs jprobe_saved_regs;
89 unsigned long jprobe_saved_r14;
90 unsigned long jprobe_saved_r15;
91 struct prev_kprobe prev_kprobe;
92 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
95 void arch_remove_kprobe(struct kprobe *p);
96 void kretprobe_trampoline(void);
97 int is_prohibited_opcode(kprobe_opcode_t *instruction);
98 void get_instruction_type(struct arch_specific_insn *ainsn);
100 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
101 int kprobe_exceptions_notify(struct notifier_block *self,
102 unsigned long val, void *data);
104 #define flush_insn_slot(p) do { } while (0)
106 #endif /* _ASM_S390_KPROBES_H */