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
  27 int probe_is_prohibited_opcode(u16 *insn);
  28 int probe_get_fixup_type(u16 *insn);
  29 int 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
  38 struct pt_regs;
  39 struct kprobe;
  40
  41 typedef 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 */
  54 struct arch_specific_insn {
  55         /* copy of original instruction */
  56         kprobe_opcode_t *insn;
  57         unsigned int is_ftrace_insn : 1;
  58 };
  59
  60 struct prev_kprobe {
  61         struct kprobe *kp;
  62         unsigned long status;
  63 };
  64
  65 /* per-cpu kprobe control block */
  66 struct kprobe_ctlblk {
  67         unsigned long kprobe_status;
  68         unsigned long kprobe_saved_imask;
  69         unsigned long kprobe_saved_ctl[3];
  70         struct prev_kprobe prev_kprobe;
  71 };
  72
  73 void arch_remove_kprobe(struct kprobe *p);
  74 void kretprobe_trampoline(void);
  75
  76 int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  77 int kprobe_exceptions_notify(struct notifier_block *self,
  78         unsigned long val, void *data);
  79
  80 #define flush_insn_slot(p)      do { } while (0)
  81
  82 #endif /* CONFIG_KPROBES */
  83 #endif  /* _ASM_S390_KPROBES_H */