include/asm-s390/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
  35 struct pt_regs;
  36 struct kprobe;
  37
  38 typedef 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 JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
  50
  51 #define ARCH_SUPPORTS_KRETPROBES
  52 #define ARCH_INACTIVE_KPROBE_COUNT 0
  53
  54 #define KPROBE_SWAP_INST        0x10
  55
  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
  60
  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;
  68 };
  69
  70 struct ins_replace_args {
  71         kprobe_opcode_t *ptr;
  72         kprobe_opcode_t old;
  73         kprobe_opcode_t new;
  74 };
  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];
  81 };
  82
  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];
  93 };
  94
  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);
  99
 100 #define flush_insn_slot(p)      do { } while (0)
 101
 102 #endif  /* _ASM_S390_KPROBES_H */
 103
 104 #ifdef CONFIG_KPROBES
 105
 106 extern int kprobe_exceptions_notify(struct notifier_block *self,
 107                                         unsigned long val, void *data);
 108 #else   /* !CONFIG_KPROBES */
 109 static inline int kprobe_exceptions_notify(struct notifier_block *self,
 110                                                 unsigned long val, void *data)
 111 {
 112         return 0;
 113 }
 114 #endif