LXR linux/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
  25 */
  26
  27#include <linux/errno.h>
  28#include <linux/rbtree.h>
  29#include <linux/types.h>
  30#include <linux/wait.h>
  31
  32struct vm_area_struct;
  33struct mm_struct;
  34struct inode;
  35struct notifier_block;
  36struct page;
  37
  38#define UPROBE_HANDLER_REMOVE           1
  39#define UPROBE_HANDLER_MASK             1
  40
  41#define MAX_URETPROBE_DEPTH             64
  42
  43enum uprobe_filter_ctx {
  44        UPROBE_FILTER_REGISTER,
  45        UPROBE_FILTER_UNREGISTER,
  46        UPROBE_FILTER_MMAP,
  47};
  48
  49struct uprobe_consumer {
  50        int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
  51        int (*ret_handler)(struct uprobe_consumer *self,
  52                                unsigned long func,
  53                                struct pt_regs *regs);
  54        bool (*filter)(struct uprobe_consumer *self,
  55                                enum uprobe_filter_ctx ctx,
  56                                struct mm_struct *mm);
  57
  58        struct uprobe_consumer *next;
  59};
  60
  61#ifdef CONFIG_UPROBES
  62#include <asm/uprobes.h>
  63
  64enum uprobe_task_state {
  65        UTASK_RUNNING,
  66        UTASK_SSTEP,
  67        UTASK_SSTEP_ACK,
  68        UTASK_SSTEP_TRAPPED,
  69};
  70
  71/*
  72 * uprobe_task: Metadata of a task while it singlesteps.
  73 */
  74struct uprobe_task {
  75        enum uprobe_task_state          state;
  76
  77        union {
  78                struct {
  79                        struct arch_uprobe_task autask;
  80                        unsigned long           vaddr;
  81                };
  82
  83                struct {
  84                        struct callback_head    dup_xol_work;
  85                        unsigned long           dup_xol_addr;
  86                };
  87        };
  88
  89        struct uprobe                   *active_uprobe;
  90        unsigned long                   xol_vaddr;
  91
  92        struct return_instance          *return_instances;
  93        unsigned int                    depth;
  94};
  95
  96struct return_instance {
  97        struct uprobe           *uprobe;
  98        unsigned long           func;
  99        unsigned long           stack;          /* stack pointer */
 100        unsigned long           orig_ret_vaddr; /* original return address */
 101        bool                    chained;        /* true, if instance is nested */
 102
 103        struct return_instance  *next;          /* keep as stack */
 104};
 105
 106enum rp_check {
 107        RP_CHECK_CALL,
 108        RP_CHECK_CHAIN_CALL,
 109        RP_CHECK_RET,
 110};
 111
 112struct xol_area;
 113
 114struct uprobes_state {
 115        struct xol_area         *xol_area;
 116};
 117
 118extern int set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 119extern int set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
 120extern bool is_swbp_insn(uprobe_opcode_t *insn);
 121extern bool is_trap_insn(uprobe_opcode_t *insn);
 122extern unsigned long uprobe_get_swbp_addr(struct pt_regs *regs);
 123extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs);
 124extern int uprobe_write_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t);
 125extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 126extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool);
 127extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
 128extern int uprobe_mmap(struct vm_area_struct *vma);
 129extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 130extern void uprobe_start_dup_mmap(void);
 131extern void uprobe_end_dup_mmap(void);
 132extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
 133extern void uprobe_free_utask(struct task_struct *t);
 134extern void uprobe_copy_process(struct task_struct *t, unsigned long flags);
 135extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
 136extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
 137extern void uprobe_notify_resume(struct pt_regs *regs);
 138extern bool uprobe_deny_signal(void);
 139extern bool arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
 140extern void uprobe_clear_state(struct mm_struct *mm);
 141extern int  arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
 142extern int  arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 143extern int  arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 144extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
 145extern int  arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
 146extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
 147extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
 148extern bool arch_uretprobe_is_alive(struct return_instance *ret, enum rp_check ctx, struct pt_regs *regs);
 149extern bool arch_uprobe_ignore(struct arch_uprobe *aup, struct pt_regs *regs);
 150extern void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
 151                                         void *src, unsigned long len);
 152#else /* !CONFIG_UPROBES */
 153struct uprobes_state {
 154};
 155
 156#define uprobe_get_trap_addr(regs)      instruction_pointer(regs)
 157
 158static inline int
 159uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 160{
 161        return -ENOSYS;
 162}
 163static inline int
 164uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add)
 165{
 166        return -ENOSYS;
 167}
 168static inline void
 169uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
 170{
 171}
 172static inline int uprobe_mmap(struct vm_area_struct *vma)
 173{
 174        return 0;
 175}
 176static inline void
 177uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 178{
 179}
 180static inline void uprobe_start_dup_mmap(void)
 181{
 182}
 183static inline void uprobe_end_dup_mmap(void)
 184{
 185}
 186static inline void
 187uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
 188{
 189}
 190static inline void uprobe_notify_resume(struct pt_regs *regs)
 191{
 192}
 193static inline bool uprobe_deny_signal(void)
 194{
 195        return false;
 196}
 197static inline void uprobe_free_utask(struct task_struct *t)
 198{
 199}
 200static inline void uprobe_copy_process(struct task_struct *t, unsigned long flags)
 201{
 202}
 203static inline void uprobe_clear_state(struct mm_struct *mm)
 204{
 205}
 206#endif /* !CONFIG_UPROBES */
 207#endif  /* _LINUX_UPROBES_H */
 208