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 }; 58 59 struct prev_kprobe { 60 struct kprobe *kp; 61 unsigned long status; 62 }; 63 64 /* per-cpu kprobe control block */ 65 struct 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 72 void arch_remove_kprobe(struct kprobe *p); 73 void kretprobe_trampoline(void); 74 75 int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 76 int 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