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
  34#define  __ARCH_WANT_KPROBES_INSN_SLOT
  35struct pt_regs;
  36struct kprobe;
  37
  38typedef u16 kprobe_opcode_t;
  39#define BREAKPOINT_INSTRUCTION  0x0002
  40
  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)))
  48
  49#define kretprobe_blacklist_size 0
  50
  51#define KPROBE_SWAP_INST        0x10
  52
  53#define FIXUP_PSW_NORMAL        0x08
  54#define FIXUP_BRANCH_NOT_TAKEN  0x04
  55#define FIXUP_RETURN_REGISTER   0x02
  56#define FIXUP_NOT_REQUIRED      0x01
  57
  58/* Architecture specific copy of original instruction */
  59struct arch_specific_insn {
  60        /* copy of original instruction */
  61        kprobe_opcode_t *insn;
  62        int fixup;
  63        int ilen;
  64        int reg;
  65};
  66
  67struct ins_replace_args {
  68        kprobe_opcode_t *ptr;
  69        kprobe_opcode_t old;
  70        kprobe_opcode_t new;
  71};
  72struct prev_kprobe {
  73        struct kprobe *kp;
  74        unsigned long status;
  75        unsigned long saved_psw;
  76        unsigned long kprobe_saved_imask;
  77        unsigned long kprobe_saved_ctl[3];
  78};
  79
  80/* per-cpu kprobe control block */
  81struct kprobe_ctlblk {
  82        unsigned long kprobe_status;
  83        unsigned long kprobe_saved_imask;
  84        unsigned long kprobe_saved_ctl[3];
  85        struct pt_regs jprobe_saved_regs;
  86        unsigned long jprobe_saved_r14;
  87        unsigned long jprobe_saved_r15;
  88        struct prev_kprobe prev_kprobe;
  89        kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
  90};
  91
  92void arch_remove_kprobe(struct kprobe *p);
  93void kretprobe_trampoline(void);
  94int  is_prohibited_opcode(kprobe_opcode_t *instruction);
  95void get_instruction_type(struct arch_specific_insn *ainsn);
  96
  97int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  98int kprobe_exceptions_notify(struct notifier_block *self,
  99        unsigned long val, void *data);
 100
 101#define flush_insn_slot(p)      do { } while (0)
 102
 103#endif  /* _ASM_S390_KPROBES_H */
 104