linux/include/linux/uprobes.h
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   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
  30struct vm_area_struct;
  31struct mm_struct;
  32struct 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
  41enum uprobe_filter_ctx {
  42        UPROBE_FILTER_REGISTER,
  43        UPROBE_FILTER_UNREGISTER,
  44        UPROBE_FILTER_MMAP,
  45};
  46
  47struct 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
  57enum 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 */
  67struct 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 */
  82struct 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
  96struct uprobes_state {
  97        struct xol_area         *xol_area;
  98};
  99
 100extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 101extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 102extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
 103extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 104extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
 105extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 106extern int uprobe_mmap(struct vm_area_struct *vma);
 107extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 108extern void uprobe_start_dup_mmap(void);
 109extern void uprobe_end_dup_mmap(void);
 110extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
 111extern void uprobe_free_utask(struct task_struct *t);
 112extern void uprobe_copy_process(struct task_struct *t);
 113extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
 114extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
 115extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
 116extern void uprobe_notify_resume(struct pt_regs *regs);
 117extern bool uprobe_deny_signal(void);
 118extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
 119extern void uprobe_clear_state(struct mm_struct *mm);
 120#else /* !CONFIG_UPROBES */
 121struct uprobes_state {
 122};
 123static inline int
 124uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 125{
 126        return -ENOSYS;
 127}
 128static inline int
 129uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
 130{
 131        return -ENOSYS;
 132}
 133static inline void
 134uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 135{
 136}
 137static inline int uprobe_mmap(struct vm_area_struct *vma)
 138{
 139        return 0;
 140}
 141static inline void
 142uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 143{
 144}
 145static inline void uprobe_start_dup_mmap(void)
 146{
 147}
 148static inline void uprobe_end_dup_mmap(void)
 149{
 150}
 151static inline void
 152uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
 153{
 154}
 155static inline void uprobe_notify_resume(struct pt_regs *regs)
 156{
 157}
 158static inline bool uprobe_deny_signal(void)
 159{
 160        return false;
 161}
 162static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
 163{
 164        return 0;
 165}
 166static inline void uprobe_free_utask(struct task_struct *t)
 167{
 168}
 169static inline void uprobe_copy_process(struct task_struct *t)
 170{
 171}
 172static inline void uprobe_clear_state(struct mm_struct *mm)
 173{
 174}
 175#endif /* !CONFIG_UPROBES */
 176#endif  /* _LINUX_UPROBES_H */
 177
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