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Linux/arch/s390/include/asm/kprobes.h

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  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 */
 84 

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