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63c40436a1
With the general-instruction extension facility (z10) a couple of instructions with a pc-relative long displacement were introduced. The kprobes support for these instructions however was never implemented. In result, if anybody ever put a probe on any of these instructions the result would have been random behaviour after the instruction got executed within the insn slot. So lets add the missing handling for these instructions. Since all of the new instructions have 32 bit signed displacement the easiest solution is to allocate an insn slot that is within the same 2GB area like the original instruction and patch the displacement field. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
90 lines
2.6 KiB
C
90 lines
2.6 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 <linux/ptrace.h>
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#include <linux/percpu.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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#define BREAKPOINT_INSTRUCTION 0x0002
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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)current_thread_info()) + THREAD_SIZE - (ADDR))) \
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? (MAX_STACK_SIZE) \
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: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
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#define kretprobe_blacklist_size 0
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#define KPROBE_SWAP_INST 0x10
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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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/* 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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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 /* _ASM_S390_KPROBES_H */
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