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1b08e90721
Kill UTASK_BP_HIT state, it buys nothing but complicates the code. It is only used in uprobe_notify_resume() to decide who should be called, we can check utask->active_uprobe != NULL instead. And this allows us to simplify handle_swbp(), no need to clear utask->state. Likewise we could kill UTASK_SSTEP, but UTASK_BP_HIT is worse and imho should die. The problem is, it creates the special case when task->utask is NULL, we can't distinguish RUNNING and BP_HIT. With this patch utask == NULL always means RUNNING. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
168 lines
5.0 KiB
C
168 lines
5.0 KiB
C
#ifndef _LINUX_UPROBES_H
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#define _LINUX_UPROBES_H
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/*
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* User-space Probes (UProbes)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2008-2012
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* Authors:
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* Srikar Dronamraju
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* Jim Keniston
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* Copyright (C) 2011-2012 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
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*/
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#include <linux/errno.h>
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#include <linux/rbtree.h>
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struct vm_area_struct;
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struct mm_struct;
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struct inode;
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#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
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# include <asm/uprobes.h>
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#endif
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/* flags that denote/change uprobes behaviour */
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/* Have a copy of original instruction */
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#define UPROBE_COPY_INSN 0x1
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/* Dont run handlers when first register/ last unregister in progress*/
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#define UPROBE_RUN_HANDLER 0x2
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/* Can skip singlestep */
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#define UPROBE_SKIP_SSTEP 0x4
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struct uprobe_consumer {
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int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
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/*
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* filter is optional; If a filter exists, handler is run
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* if and only if filter returns true.
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*/
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bool (*filter)(struct uprobe_consumer *self, struct task_struct *task);
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struct uprobe_consumer *next;
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};
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#ifdef CONFIG_UPROBES
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enum uprobe_task_state {
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UTASK_RUNNING,
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UTASK_SSTEP,
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UTASK_SSTEP_ACK,
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UTASK_SSTEP_TRAPPED,
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};
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/*
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* uprobe_task: Metadata of a task while it singlesteps.
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*/
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struct uprobe_task {
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enum uprobe_task_state state;
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struct arch_uprobe_task autask;
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struct uprobe *active_uprobe;
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unsigned long xol_vaddr;
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unsigned long vaddr;
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};
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/*
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* On a breakpoint hit, thread contests for a slot. It frees the
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* slot after singlestep. Currently a fixed number of slots are
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* allocated.
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*/
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struct xol_area {
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wait_queue_head_t wq; /* if all slots are busy */
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atomic_t slot_count; /* number of in-use slots */
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unsigned long *bitmap; /* 0 = free slot */
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struct page *page;
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/*
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* We keep the vma's vm_start rather than a pointer to the vma
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* itself. The probed process or a naughty kernel module could make
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* the vma go away, and we must handle that reasonably gracefully.
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*/
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unsigned long vaddr; /* Page(s) of instruction slots */
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};
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struct uprobes_state {
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struct xol_area *xol_area;
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};
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extern int __weak set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
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extern int __weak set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr);
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extern bool __weak is_swbp_insn(uprobe_opcode_t *insn);
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extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
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extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc);
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extern int uprobe_mmap(struct vm_area_struct *vma);
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extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end);
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extern void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm);
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extern void uprobe_free_utask(struct task_struct *t);
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extern void uprobe_copy_process(struct task_struct *t);
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extern unsigned long __weak uprobe_get_swbp_addr(struct pt_regs *regs);
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extern void __weak arch_uprobe_enable_step(struct arch_uprobe *arch);
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extern void __weak arch_uprobe_disable_step(struct arch_uprobe *arch);
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extern int uprobe_post_sstep_notifier(struct pt_regs *regs);
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extern int uprobe_pre_sstep_notifier(struct pt_regs *regs);
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extern void uprobe_notify_resume(struct pt_regs *regs);
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extern bool uprobe_deny_signal(void);
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extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
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extern void uprobe_clear_state(struct mm_struct *mm);
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#else /* !CONFIG_UPROBES */
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struct uprobes_state {
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};
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static inline int
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uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
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{
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return -ENOSYS;
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}
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static inline void
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uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
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{
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}
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static inline int uprobe_mmap(struct vm_area_struct *vma)
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{
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return 0;
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}
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static inline void
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uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
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{
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}
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static inline void
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uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
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{
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}
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static inline void uprobe_notify_resume(struct pt_regs *regs)
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{
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}
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static inline bool uprobe_deny_signal(void)
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{
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return false;
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}
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static inline unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
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{
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return 0;
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}
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static inline void uprobe_free_utask(struct task_struct *t)
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{
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}
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static inline void uprobe_copy_process(struct task_struct *t)
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{
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}
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static inline void uprobe_clear_state(struct mm_struct *mm)
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{
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}
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#endif /* !CONFIG_UPROBES */
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#endif /* _LINUX_UPROBES_H */
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