LXR linux/arch/s390/include/asm/kprobes.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2#ifndef _ASM_S390_KPROBES_H
   3#define _ASM_S390_KPROBES_H
   4/*
   5 *  Kernel Probes (KProbes)
   6 *
   7 * Copyright IBM Corp. 2002, 2006
   8 *
   9 * 2002-Oct     Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
  10 *              Probes initial implementation ( includes suggestions from
  11 *              Rusty Russell).
  12 * 2004-Nov     Modified for PPC64 by Ananth N Mavinakayanahalli
  13 *              <ananth@in.ibm.com>
  14 * 2005-Dec     Used as a template for s390 by Mike Grundy
  15 *              <grundym@us.ibm.com>
  16 */
  17#include <linux/types.h>
  18#include <asm-generic/kprobes.h>
  19
  20#define BREAKPOINT_INSTRUCTION  0x0002
  21
  22#define FIXUP_PSW_NORMAL        0x08
  23#define FIXUP_BRANCH_NOT_TAKEN  0x04
  24#define FIXUP_RETURN_REGISTER   0x02
  25#define FIXUP_NOT_REQUIRED      0x01
  26
  27int probe_is_prohibited_opcode(u16 *insn);
  28int probe_get_fixup_type(u16 *insn);
  29int probe_is_insn_relative_long(u16 *insn);
  30
  31#ifdef CONFIG_KPROBES
  32#include <linux/ptrace.h>
  33#include <linux/percpu.h>
  34#include <linux/sched/task_stack.h>
  35
  36#define __ARCH_WANT_KPROBES_INSN_SLOT
  37
  38struct pt_regs;
  39struct kprobe;
  40
  41typedef u16 kprobe_opcode_t;
  42
  43/* Maximum instruction size is 3 (16bit) halfwords: */
  44#define MAX_INSN_SIZE           0x0003
  45#define MAX_STACK_SIZE          64
  46#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
  47        (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
  48        ? (MAX_STACK_SIZE) \
  49        : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
  50
  51#define kretprobe_blacklist_size 0
  52
  53/* Architecture specific copy of original instruction */
  54struct arch_specific_insn {
  55        /* copy of original instruction */
  56        kprobe_opcode_t *insn;
  57};
  58
  59struct prev_kprobe {
  60        struct kprobe *kp;
  61        unsigned long status;
  62};
  63
  64/* per-cpu kprobe control block */
  65struct kprobe_ctlblk {
  66        unsigned long kprobe_status;
  67        unsigned long kprobe_saved_imask;
  68        unsigned long kprobe_saved_ctl[3];
  69        struct prev_kprobe prev_kprobe;
  70};
  71
  72void arch_remove_kprobe(struct kprobe *p);
  73void kretprobe_trampoline(void);
  74
  75int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  76int kprobe_exceptions_notify(struct notifier_block *self,
  77        unsigned long val, void *data);
  78
  79#define flush_insn_slot(p)      do { } while (0)
  80
  81#endif /* CONFIG_KPROBES */
  82#endif  /* _ASM_S390_KPROBES_H */
  83