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
  38struct uprobe_consumer {
  39        int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
  40        /*
  41         * filter is optional; If a filter exists, handler is run
  42         * if and only if filter returns true.
  43         */
  44        bool (*filter)(struct uprobe_consumer *self, struct task_struct *task);
  45
  46        struct uprobe_consumer *next;
  47};
  48
  49#ifdef CONFIG_UPROBES
  50enum uprobe_task_state {
  51        UTASK_RUNNING,
  52        UTASK_SSTEP,
  53        UTASK_SSTEP_ACK,
  54        UTASK_SSTEP_TRAPPED,
  55};
  56
  57/*
  58 * uprobe_task: Metadata of a task while it singlesteps.
  59 */
  60struct uprobe_task {
  61        enum uprobe_task_state          state;
  62        struct arch_uprobe_task         autask;
  63
  64        struct uprobe                   *active_uprobe;
  65
  66        unsigned long                   xol_vaddr;
  67        unsigned long                   vaddr;
  68};
  69
  70/*
  71 * On a breakpoint hit, thread contests for a slot.  It frees the
  72 * slot after singlestep. Currently a fixed number of slots are
  73 * allocated.
  74 */
  75struct xol_area {
  76        wait_queue_head_t       wq;             /* if all slots are busy */
  77        atomic_t                slot_count;     /* number of in-use slots */
  78        unsigned long           *bitmap;        /* 0 = free slot */
  79        struct page             *page;
  80
  81        /*
  82         * We keep the vma's vm_start rather than a pointer to the vma
  83         * itself.  The probed process or a naughty kernel module could make
  84         * the vma go away, and we must handle that reasonably gracefully.
  85         */
  86        unsigned long           vaddr;          /* Page(s) of instruction slots */
  87};
  88
  89struct uprobes_state {
  90        struct xol_area         *xol_area;
  91};
  92
  93extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
  94extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
  95extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
  96extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
  97extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
  98extern int uprobe_mmap(struct vm_area_struct *vma);
  99extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 100extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
 101extern void uprobe_free_utask(struct task_struct *t);
 102extern void uprobe_copy_process(struct task_struct *t);
 103extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
 104extern void __weak arch_uprobe_enable_step(struct arch_uprobe *arch);
 105extern void __weak arch_uprobe_disable_step(struct arch_uprobe *arch);
 106extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
 107extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
 108extern void uprobe_notify_resume(struct pt_regs *regs);
 109extern bool uprobe_deny_signal(void);
 110extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
 111extern void uprobe_clear_state(struct mm_struct *mm);
 112#else /* !CONFIG_UPROBES */
 113struct uprobes_state {
 114};
 115static inline int
 116uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 117{
 118        return -ENOSYS;
 119}
 120static inline void
 121uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 122{
 123}
 124static inline int uprobe_mmap(struct vm_area_struct *vma)
 125{
 126        return 0;
 127}
 128static inline void
 129uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 130{
 131}
 132static inline void
 133uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
 134{
 135}
 136static inline void uprobe_notify_resume(struct pt_regs *regs)
 137{
 138}
 139static inline bool uprobe_deny_signal(void)
 140{
 141        return false;
 142}
 143static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
 144{
 145        return 0;
 146}
 147static inline void uprobe_free_utask(struct task_struct *t)
 148{
 149}
 150static inline void uprobe_copy_process(struct task_struct *t)
 151{
 152}
 153static inline void uprobe_clear_state(struct mm_struct *mm)
 154{
 155}
 156#endif /* !CONFIG_UPROBES */
 157#endif  /* _LINUX_UPROBES_H */
 158
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