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[S390] add kprobes support.
Signed-off-by: Michael Grundy <[email protected]> Signed-off-by: David Wilder <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Michael Grundy
Martin Schwidefsky
parent
5432114baf
commit
4ba069b802
10 changed files with 937 additions and 4 deletions
59
include/asm-s390/kdebug.h
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59
include/asm-s390/kdebug.h
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#ifndef _S390_KDEBUG_H
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#define _S390_KDEBUG_H
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/*
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* Feb 2006 Ported to s390 <grundym@us.ibm.com>
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*/
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#include <linux/notifier.h>
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struct pt_regs;
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struct die_args {
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struct pt_regs *regs;
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const char *str;
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long err;
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int trapnr;
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int signr;
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};
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/* Note - you should never unregister because that can race with NMIs.
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* If you really want to do it first unregister - then synchronize_sched
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* - then free.
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*/
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extern int register_die_notifier(struct notifier_block *);
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extern int unregister_die_notifier(struct notifier_block *);
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extern int register_page_fault_notifier(struct notifier_block *);
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extern int unregister_page_fault_notifier(struct notifier_block *);
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extern struct atomic_notifier_head s390die_chain;
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enum die_val {
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DIE_OOPS = 1,
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DIE_BPT,
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DIE_SSTEP,
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DIE_PANIC,
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DIE_NMI,
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DIE_DIE,
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DIE_NMIWATCHDOG,
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DIE_KERNELDEBUG,
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DIE_TRAP,
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DIE_GPF,
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DIE_CALL,
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DIE_NMI_IPI,
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DIE_PAGE_FAULT,
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};
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static inline int notify_die(enum die_val val, const char *str,
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struct pt_regs *regs, long err, int trap, int sig)
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{
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struct die_args args = {
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.regs = regs,
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.str = str,
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.err = err,
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.trapnr = trap,
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.signr = sig
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};
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return atomic_notifier_call_chain(&s390die_chain, val, &args);
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}
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#endif
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114
include/asm-s390/kprobes.h
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114
include/asm-s390/kprobes.h
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#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 (C) IBM Corporation, 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 JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
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#define ARCH_SUPPORTS_KRETPROBES
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#define ARCH_INACTIVE_KPROBE_COUNT 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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int fixup;
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int ilen;
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int reg;
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};
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struct ins_replace_args {
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kprobe_opcode_t *ptr;
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kprobe_opcode_t old;
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kprobe_opcode_t new;
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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_psw;
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unsigned long kprobe_saved_imask;
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unsigned long kprobe_saved_ctl[3];
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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 pt_regs jprobe_saved_regs;
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unsigned long jprobe_saved_r14;
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unsigned long jprobe_saved_r15;
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struct prev_kprobe prev_kprobe;
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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 is_prohibited_opcode(kprobe_opcode_t *instruction);
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void get_instruction_type(struct arch_specific_insn *ainsn);
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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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#ifdef CONFIG_KPROBES
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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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#else /* !CONFIG_KPROBES */
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static inline int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data)
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{
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return 0;
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}
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#endif
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