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df8bbd0c98
For an unknown reason the s390 kprobes instruction replacement function modifies the kprobe_status of the current CPU to KPROBE_SWAP_INST. This was supposed to catch traps that happened during instruction patching. Such a fault is not supposed to happen, and silently discarding such a fault is certainly also not what we want. In fact s390 is the only architecture which has this odd piece of code. Just remove this and behave like all other architectures. This was pointed out by Jens Remus. Reported-by: Jens Remus <jremus@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
#ifndef _ASM_S390_KPROBES_H
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#define _ASM_S390_KPROBES_H
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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 IBM Corp. 2002, 2006
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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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* 2005-Dec Used as a template for s390 by Mike Grundy
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* <grundym@us.ibm.com>
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*/
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#include <linux/types.h>
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#include <asm-generic/kprobes.h>
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#define BREAKPOINT_INSTRUCTION 0x0002
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#define FIXUP_PSW_NORMAL 0x08
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#define FIXUP_BRANCH_NOT_TAKEN 0x04
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#define FIXUP_RETURN_REGISTER 0x02
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#define FIXUP_NOT_REQUIRED 0x01
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int probe_is_prohibited_opcode(u16 *insn);
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int probe_get_fixup_type(u16 *insn);
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int probe_is_insn_relative_long(u16 *insn);
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#ifdef CONFIG_KPROBES
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#include <linux/sched/task_stack.h>
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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 u16 kprobe_opcode_t;
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/* Maximum instruction size is 3 (16bit) halfwords: */
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#define MAX_INSN_SIZE 0x0003
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#define MAX_STACK_SIZE 64
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#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
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(((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
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? (MAX_STACK_SIZE) \
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: (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
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#define kretprobe_blacklist_size 0
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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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unsigned int is_ftrace_insn : 1;
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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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};
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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_imask;
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unsigned long kprobe_saved_ctl[3];
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struct prev_kprobe prev_kprobe;
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struct pt_regs jprobe_saved_regs;
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kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
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};
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void arch_remove_kprobe(struct kprobe *p);
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void kretprobe_trampoline(void);
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int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
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int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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#define flush_insn_slot(p) do { } while (0)
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#endif /* CONFIG_KPROBES */
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#endif /* _ASM_S390_KPROBES_H */
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