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uprobe_opcode_sz refers to the smallest instruction size for that architecture. UPROBES_BKPT_INSN_SIZE refers to the size of the breakpoint instruction for that architecture. For now we are assuming that both uprobe_opcode_sz and UPROBES_BKPT_INSN_SIZE are the same for all archs and hence removing uprobe_opcode_sz in favour of UPROBES_BKPT_INSN_SIZE. However if we have to support architectures where the smallest instruction size is different from the size of breakpoint instruction, we may have to re-introduce uprobe_opcode_sz. Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Anton Arapov <anton@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Josh Stone <jistone@redhat.com> Link: http://lkml.kernel.org/r/20120222091549.15880.67020.sendpatchset@srdronam.in.ibm.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
94 lines
2.9 KiB
C
94 lines
2.9 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, 2008-2011
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* Authors:
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* Srikar Dronamraju
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* Jim Keniston
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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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#ifdef CONFIG_ARCH_SUPPORTS_UPROBES
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#include <asm/uprobes.h>
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#else
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typedef u8 uprobe_opcode_t;
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struct uprobe_arch_info {};
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#define MAX_UINSN_BYTES 4
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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 UPROBES_COPY_INSN 0x1
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/* Dont run handlers when first register/ last unregister in progress*/
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#define UPROBES_RUN_HANDLER 0x2
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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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struct uprobe {
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struct rb_node rb_node; /* node in the rb tree */
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atomic_t ref;
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struct rw_semaphore consumer_rwsem;
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struct list_head pending_list;
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struct uprobe_arch_info arch_info;
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struct uprobe_consumer *consumers;
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struct inode *inode; /* Also hold a ref to inode */
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loff_t offset;
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int flags;
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u8 insn[MAX_UINSN_BYTES];
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};
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#ifdef CONFIG_UPROBES
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extern int __weak set_bkpt(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr);
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extern int __weak set_orig_insn(struct mm_struct *mm, struct uprobe *uprobe, unsigned long vaddr, bool verify);
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extern bool __weak is_bkpt_insn(uprobe_opcode_t *insn);
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extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
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extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer);
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extern int uprobe_mmap(struct vm_area_struct *vma);
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#else /* CONFIG_UPROBES is not defined */
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static inline int
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uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *consumer)
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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 *consumer)
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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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#endif /* CONFIG_UPROBES */
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#endif /* _LINUX_UPROBES_H */
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