LXR linux/arch/s390/include/asm/kprobes.h

   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 (C) IBM Corporation, 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
  34struct pt_regs;
  35struct kprobe;
  36
  37typedef 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 */
  58struct arch_specific_insn {
  59        /* copy of original instruction */
  60        kprobe_opcode_t insn[MAX_INSN_SIZE];
  61};
  62
  63struct prev_kprobe {
  64        struct kprobe *kp;
  65        unsigned long status;
  66};
  67
  68/* per-cpu kprobe control block */
  69struct 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;
  74        struct pt_regs jprobe_saved_regs;
  75        kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
  76};
  77
  78void arch_remove_kprobe(struct kprobe *p);
  79void kretprobe_trampoline(void);
  80
  81int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  82int kprobe_exceptions_notify(struct notifier_block *self,
  83        unsigned long val, void *data);
  84
  85#define flush_insn_slot(p)      do { } while (0)
  86
  87#endif  /* _ASM_S390_KPROBES_H */
  88