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Hijack the return address and replace it with a trampoline address. PowerPC implementation. Signed-off-by: Anton Arapov <anton@redhat.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
#ifndef _ASM_UPROBES_H
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#define _ASM_UPROBES_H
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/*
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* User-space Probes (UProbes) for powerpc
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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 IBM Corporation, 2007-2012
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*
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* Adapted from the x86 port by Ananth N Mavinakayanahalli <ananth@in.ibm.com>
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*/
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#include <linux/notifier.h>
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#include <asm/probes.h>
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typedef ppc_opcode_t uprobe_opcode_t;
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#define MAX_UINSN_BYTES 4
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#define UPROBE_XOL_SLOT_BYTES (MAX_UINSN_BYTES)
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/* The following alias is needed for reference from arch-agnostic code */
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#define UPROBE_SWBP_INSN BREAKPOINT_INSTRUCTION
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#define UPROBE_SWBP_INSN_SIZE 4 /* swbp insn size in bytes */
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struct arch_uprobe {
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union {
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u8 insn[MAX_UINSN_BYTES];
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u32 ainsn;
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};
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};
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struct arch_uprobe_task {
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unsigned long saved_trap_nr;
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};
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extern int arch_uprobe_analyze_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long addr);
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extern int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern bool arch_uprobe_xol_was_trapped(struct task_struct *tsk);
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extern int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val, void *data);
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extern void arch_uprobe_abort_xol(struct arch_uprobe *aup, struct pt_regs *regs);
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extern unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs *regs);
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#endif /* _ASM_UPROBES_H */
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