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Diffstat (limited to 'include/linux/uprobes.h')
| -rw-r--r-- | include/linux/uprobes.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h new file mode 100644 index 000000000000..efe4b3308c74 --- /dev/null +++ b/include/linux/uprobes.h @@ -0,0 +1,165 @@ +#ifndef _LINUX_UPROBES_H +#define _LINUX_UPROBES_H +/* + * User-space Probes (UProbes) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) IBM Corporation, 2008-2012 + * Authors: + * Srikar Dronamraju + * Jim Keniston + * Copyright (C) 2011-2012 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> + */ + +#include <linux/errno.h> +#include <linux/rbtree.h> + +struct vm_area_struct; +struct mm_struct; +struct inode; + +#ifdef CONFIG_ARCH_SUPPORTS_UPROBES +# include <asm/uprobes.h> +#endif + +/* flags that denote/change uprobes behaviour */ + +/* Have a copy of original instruction */ +#define UPROBE_COPY_INSN 0x1 + +/* Dont run handlers when first register/ last unregister in progress*/ +#define UPROBE_RUN_HANDLER 0x2 +/* Can skip singlestep */ +#define UPROBE_SKIP_SSTEP 0x4 + +struct uprobe_consumer { + int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs); + /* + * filter is optional; If a filter exists, handler is run + * if and only if filter returns true. + */ + bool (*filter)(struct uprobe_consumer *self, struct task_struct *task); + + struct uprobe_consumer *next; +}; + +#ifdef CONFIG_UPROBES +enum uprobe_task_state { + UTASK_RUNNING, + UTASK_BP_HIT, + UTASK_SSTEP, + UTASK_SSTEP_ACK, + UTASK_SSTEP_TRAPPED, +}; + +/* + * uprobe_task: Metadata of a task while it singlesteps. + */ +struct uprobe_task { + enum uprobe_task_state state; + struct arch_uprobe_task autask; + + struct uprobe *active_uprobe; + + unsigned long xol_vaddr; + unsigned long vaddr; +}; + +/* + * On a breakpoint hit, thread contests for a slot. It frees the + * slot after singlestep. Currently a fixed number of slots are + * allocated. + */ +struct xol_area { + wait_queue_head_t wq; /* if all slots are busy */ + atomic_t slot_count; /* number of in-use slots */ + unsigned long *bitmap; /* 0 = free slot */ + struct page *page; + + /* + * We keep the vma's vm_start rather than a pointer to the vma + * itself. The probed process or a naughty kernel module could make + * the vma go away, and we must handle that reasonably gracefully. + */ + unsigned long vaddr; /* Page(s) of instruction slots */ +}; + +struct uprobes_state { + struct xol_area *xol_area; + atomic_t count; +}; +extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); +extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr, bool verify); +extern bool __weak is_swbp_insn(uprobe_opcode_t *insn); +extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); +extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); +extern int uprobe_mmap(struct vm_area_struct *vma); +extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end); +extern void uprobe_free_utask(struct task_struct *t); +extern void uprobe_copy_process(struct task_struct *t); +extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs); +extern int uprobe_post_sstep_notifier(struct pt_regs *regs); +extern int uprobe_pre_sstep_notifier(struct pt_regs *regs); +extern void uprobe_notify_resume(struct pt_regs *regs); +extern bool uprobe_deny_signal(void); +extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs); +extern void uprobe_clear_state(struct mm_struct *mm); +extern void uprobe_reset_state(struct mm_struct *mm); +#else /* !CONFIG_UPROBES */ +struct uprobes_state { +}; +static inline int +uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) +{ + return -ENOSYS; +} +static inline void +uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) +{ +} +static inline int uprobe_mmap(struct vm_area_struct *vma) +{ + return 0; +} +static inline void +uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end) +{ +} +static inline void uprobe_notify_resume(struct pt_regs *regs) +{ +} +static inline bool uprobe_deny_signal(void) +{ + return false; +} +static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs) +{ + return 0; +} +static inline void uprobe_free_utask(struct task_struct *t) +{ +} +static inline void uprobe_copy_process(struct task_struct *t) +{ +} +static inline void uprobe_clear_state(struct mm_struct *mm) +{ +} +static inline void uprobe_reset_state(struct mm_struct *mm) +{ +} +#endif /* !CONFIG_UPROBES */ +#endif /* _LINUX_UPROBES_H */ |