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 struct notifier_block;
  34
  35 #ifdef CONFIG_ARCH_SUPPORTS_UPROBES
  36 # include <asm/uprobes.h>
  37 #endif
  38
  39 #define UPROBE_HANDLER_REMOVE           1
  40 #define UPROBE_HANDLER_MASK             1
  41
  42 #define MAX_URETPROBE_DEPTH             64
  43
  44 enum uprobe_filter_ctx {
  45         UPROBE_FILTER_REGISTER,
  46         UPROBE_FILTER_UNREGISTER,
  47         UPROBE_FILTER_MMAP,
  48 };
  49
  50 struct uprobe_consumer {
  51         int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
  52         int (*ret_handler)(struct uprobe_consumer *self,
  53                                 unsigned long func,
  54                                 struct pt_regs *regs);
  55         bool (*filter)(struct uprobe_consumer *self,
  56                                 enum uprobe_filter_ctx ctx,
  57                                 struct mm_struct *mm);
  58
  59         struct uprobe_consumer *next;
  60 };
  61
  62 #ifdef CONFIG_UPROBES
  63 enum uprobe_task_state {
  64         UTASK_RUNNING,
  65         UTASK_SSTEP,
  66         UTASK_SSTEP_ACK,
  67         UTASK_SSTEP_TRAPPED,
  68 };
  69
  70 /*
  71  * uprobe_task: Metadata of a task while it singlesteps.
  72  */
  73 struct uprobe_task {
  74         enum uprobe_task_state          state;
  75         struct arch_uprobe_task         autask;
  76
  77         struct return_instance          *return_instances;
  78         unsigned int                    depth;
  79         struct uprobe                   *active_uprobe;
  80
  81         unsigned long                   xol_vaddr;
  82         unsigned long                   vaddr;
  83 };
  84
  85 /*
  86  * On a breakpoint hit, thread contests for a slot.  It frees the
  87  * slot after singlestep. Currently a fixed number of slots are
  88  * allocated.
  89  */
  90 struct xol_area {
  91         wait_queue_head_t       wq;             /* if all slots are busy */
  92         atomic_t                slot_count;     /* number of in-use slots */
  93         unsigned long           *bitmap;        /* 0 = free slot */
  94         struct page             *page;
  95
  96         /*
  97          * We keep the vma's vm_start rather than a pointer to the vma
  98          * itself.  The probed process or a naughty kernel module could make
  99          * the vma go away, and we must handle that reasonably gracefully.
 100          */
 101         unsigned long           vaddr;          /* Page(s) of instruction slots */
 102 };
 103
 104 struct uprobes_state {
 105         struct xol_area         *xol_area;
 106 };
 107
 108 extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 109 extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 110 extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
 111 extern bool __weak is_trap_insn(uprobe_opcode_t *insn);
 112 extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
 113 extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 114 extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
 115 extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 116 extern int uprobe_mmap(struct vm_area_struct *vma);
 117 extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 118 extern void uprobe_start_dup_mmap(void);
 119 extern void uprobe_end_dup_mmap(void);
 120 extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
 121 extern void uprobe_free_utask(struct task_struct *t);
 122 extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
 123 extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
 124 extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
 125 extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
 126 extern void uprobe_notify_resume(struct pt_regs *regs);
 127 extern bool uprobe_deny_signal(void);
 128 extern bool arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
 129 extern void uprobe_clear_state(struct mm_struct *mm);
 130 extern int  arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
 131 extern int  arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 132 extern int  arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 133 extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
 134 extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
 135 extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 136 extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
 137 #else /* !CONFIG_UPROBES */
 138 struct uprobes_state {
 139 };
 140 static inline int
 141 uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 142 {
 143         return -ENOSYS;
 144 }
 145 static inline int
 146 uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
 147 {
 148         return -ENOSYS;
 149 }
 150 static inline void
 151 uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 152 {
 153 }
 154 static inline int uprobe_mmap(struct vm_area_struct *vma)
 155 {
 156         return 0;
 157 }
 158 static inline void
 159 uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 160 {
 161 }
 162 static inline void uprobe_start_dup_mmap(void)
 163 {
 164 }
 165 static inline void uprobe_end_dup_mmap(void)
 166 {
 167 }
 168 static inline void
 169 uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
 170 {
 171 }
 172 static inline void uprobe_notify_resume(struct pt_regs *regs)
 173 {
 174 }
 175 static inline bool uprobe_deny_signal(void)
 176 {
 177         return false;
 178 }
 179 static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
 180 {
 181         return 0;
 182 }
 183 static inline void uprobe_free_utask(struct task_struct *t)
 184 {
 185 }
 186 static inline void uprobe_copy_process(struct task_struct *t, unsigned long flags)
 187 {
 188 }
 189 static inline void uprobe_clear_state(struct mm_struct *mm)
 190 {
 191 }
 192 #endif /* !CONFIG_UPROBES */
 193 #endif  /* _LINUX_UPROBES_H */