include/linux/uprobes.h

   1 #ifndef _LINUX_UPROBES_H
   2 #define _LINUX_UPROBES_H
   3 /*
   4  * User-space Probes (UProbes)
   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, 2008-2012
  21  * Authors:
  22  *      Srikar Dronamraju
  23  *      Jim Keniston
  24  * Copyright (C) 2011-2012 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
  25  */
  26
  27 #include <linux/errno.h>
  28 #include <linux/rbtree.h>
  29
  30 struct vm_area_struct;
  31 struct mm_struct;
  32 struct inode;
  33
  34 #ifdef CONFIG_ARCH_SUPPORTS_UPROBES
  35 # include <asm/uprobes.h>
  36 #endif
  37
  38 #define UPROBE_HANDLER_REMOVE           1
  39 #define UPROBE_HANDLER_MASK             1
  40
  41 enum uprobe_filter_ctx {
  42         UPROBE_FILTER_REGISTER,
  43         UPROBE_FILTER_UNREGISTER,
  44         UPROBE_FILTER_MMAP,
  45 };
  46
  47 struct uprobe_consumer {
  48         int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
  49         bool (*filter)(struct uprobe_consumer *self,
  50                                 enum uprobe_filter_ctx ctx,
  51                                 struct mm_struct *mm);
  52
  53         struct uprobe_consumer *next;
  54 };
  55
  56 #ifdef CONFIG_UPROBES
  57 enum uprobe_task_state {
  58         UTASK_RUNNING,
  59         UTASK_SSTEP,
  60         UTASK_SSTEP_ACK,
  61         UTASK_SSTEP_TRAPPED,
  62 };
  63
  64 /*
  65  * uprobe_task: Metadata of a task while it singlesteps.
  66  */
  67 struct uprobe_task {
  68         enum uprobe_task_state          state;
  69         struct arch_uprobe_task         autask;
  70
  71         struct uprobe                   *active_uprobe;
  72
  73         unsigned long                   xol_vaddr;
  74         unsigned long                   vaddr;
  75 };
  76
  77 /*
  78  * On a breakpoint hit, thread contests for a slot.  It frees the
  79  * slot after singlestep. Currently a fixed number of slots are
  80  * allocated.
  81  */
  82 struct xol_area {
  83         wait_queue_head_t       wq;             /* if all slots are busy */
  84         atomic_t                slot_count;     /* number of in-use slots */
  85         unsigned long           *bitmap;        /* 0 = free slot */
  86         struct page             *page;
  87
  88         /*
  89          * We keep the vma's vm_start rather than a pointer to the vma
  90          * itself.  The probed process or a naughty kernel module could make
  91          * the vma go away, and we must handle that reasonably gracefully.
  92          */
  93         unsigned long           vaddr;          /* Page(s) of instruction slots */
  94 };
  95
  96 struct uprobes_state {
  97         struct xol_area         *xol_area;
  98 };
  99
 100 extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 101 extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 102 extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
 103 extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 104 extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
 105 extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 106 extern int uprobe_mmap(struct vm_area_struct *vma);
 107 extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 108 extern void uprobe_start_dup_mmap(void);
 109 extern void uprobe_end_dup_mmap(void);
 110 extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
 111 extern void uprobe_free_utask(struct task_struct *t);
 112 extern void uprobe_copy_process(struct task_struct *t);
 113 extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
 114 extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
 115 extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
 116 extern void uprobe_notify_resume(struct pt_regs *regs);
 117 extern bool uprobe_deny_signal(void);
 118 extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
 119 extern void uprobe_clear_state(struct mm_struct *mm);
 120 #else /* !CONFIG_UPROBES */
 121 struct uprobes_state {
 122 };
 123 static inline int
 124 uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 125 {
 126         return -ENOSYS;
 127 }
 128 static inline int
 129 uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
 130 {
 131         return -ENOSYS;
 132 }
 133 static inline void
 134 uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 135 {
 136 }
 137 static inline int uprobe_mmap(struct vm_area_struct *vma)
 138 {
 139         return 0;
 140 }
 141 static inline void
 142 uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 143 {
 144 }
 145 static inline void uprobe_start_dup_mmap(void)
 146 {
 147 }
 148 static inline void uprobe_end_dup_mmap(void)
 149 {
 150 }
 151 static inline void
 152 uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
 153 {
 154 }
 155 static inline void uprobe_notify_resume(struct pt_regs *regs)
 156 {
 157 }
 158 static inline bool uprobe_deny_signal(void)
 159 {
 160         return false;
 161 }
 162 static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
 163 {
 164         return 0;
 165 }
 166 static inline void uprobe_free_utask(struct task_struct *t)
 167 {
 168 }
 169 static inline void uprobe_copy_process(struct task_struct *t)
 170 {
 171 }
 172 static inline void uprobe_clear_state(struct mm_struct *mm)
 173 {
 174 }
 175 #endif /* !CONFIG_UPROBES */
 176 #endif  /* _LINUX_UPROBES_H */