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bf3a912517
In commit c05b8c4474 ("powerpc/kprobes: Skip livepatch_handler() for
jprobes"), we added a helper is_current_kprobe_addr() to help detect if
the modified regs->nip was due to a jprobe or livepatch. Masami felt
that the function name was not quite clear. To that end, this patch
renames is_current_kprobe_addr() to __is_active_jprobe() and adds a
comment to (hopefully) better clarify the purpose of this helper. The
helper has also now been moved to kprobes-ftrace.c so that it is only
available for KPROBES_ON_FTRACE.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
#ifndef _ASM_POWERPC_KPROBES_H
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#define _ASM_POWERPC_KPROBES_H
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#include <asm-generic/kprobes.h>
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#ifdef __KERNEL__
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/*
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* Kernel Probes (KProbes)
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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, 2002, 2004
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*
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* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
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* Probes initial implementation ( includes suggestions from
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* Rusty Russell).
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* 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
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* <ananth@in.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#include <linux/module.h>
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#include <asm/probes.h>
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#include <asm/code-patching.h>
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#ifdef CONFIG_KPROBES
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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struct pt_regs;
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struct kprobe;
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typedef ppc_opcode_t kprobe_opcode_t;
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extern kprobe_opcode_t optinsn_slot;
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/* Optinsn template address */
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extern kprobe_opcode_t optprobe_template_entry[];
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extern kprobe_opcode_t optprobe_template_op_address[];
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extern kprobe_opcode_t optprobe_template_call_handler[];
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extern kprobe_opcode_t optprobe_template_insn[];
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extern kprobe_opcode_t optprobe_template_call_emulate[];
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extern kprobe_opcode_t optprobe_template_ret[];
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extern kprobe_opcode_t optprobe_template_end[];
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/* Fixed instruction size for powerpc */
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#define MAX_INSN_SIZE 1
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#define MAX_OPTIMIZED_LENGTH sizeof(kprobe_opcode_t) /* 4 bytes */
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#define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry)
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#define RELATIVEJUMP_SIZE sizeof(kprobe_opcode_t) /* 4 bytes */
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#define flush_insn_slot(p) do { } while (0)
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#define kretprobe_blacklist_size 0
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void kretprobe_trampoline(void);
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extern void arch_remove_kprobe(struct kprobe *p);
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/* Architecture specific copy of original instruction */
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struct arch_specific_insn {
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/* copy of original instruction */
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kprobe_opcode_t *insn;
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/*
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* Set in kprobes code, initially to 0. If the instruction can be
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* eumulated, this is set to 1, if not, to -1.
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*/
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int boostable;
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};
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned long status;
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unsigned long saved_msr;
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};
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/* per-cpu kprobe control block */
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struct kprobe_ctlblk {
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unsigned long kprobe_status;
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unsigned long kprobe_saved_msr;
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struct pt_regs jprobe_saved_regs;
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struct prev_kprobe prev_kprobe;
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};
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struct arch_optimized_insn {
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kprobe_opcode_t copied_insn[1];
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/* detour buffer */
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kprobe_opcode_t *insn;
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};
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extern int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
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extern int kprobe_handler(struct pt_regs *regs);
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extern int kprobe_post_handler(struct pt_regs *regs);
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#ifdef CONFIG_KPROBES_ON_FTRACE
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extern int __is_active_jprobe(unsigned long addr);
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extern int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
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struct kprobe_ctlblk *kcb);
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#else
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static inline int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
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struct kprobe_ctlblk *kcb)
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{
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return 0;
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}
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#endif
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#else
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static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
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static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
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#endif /* CONFIG_KPROBES */
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_KPROBES_H */
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