1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0+ */ 2*4882a593Smuzhiyun #ifndef _ASM_S390_KPROBES_H 3*4882a593Smuzhiyun #define _ASM_S390_KPROBES_H 4*4882a593Smuzhiyun /* 5*4882a593Smuzhiyun * Kernel Probes (KProbes) 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Copyright IBM Corp. 2002, 2006 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel 10*4882a593Smuzhiyun * Probes initial implementation ( includes suggestions from 11*4882a593Smuzhiyun * Rusty Russell). 12*4882a593Smuzhiyun * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli 13*4882a593Smuzhiyun * <ananth@in.ibm.com> 14*4882a593Smuzhiyun * 2005-Dec Used as a template for s390 by Mike Grundy 15*4882a593Smuzhiyun * <grundym@us.ibm.com> 16*4882a593Smuzhiyun */ 17*4882a593Smuzhiyun #include <linux/types.h> 18*4882a593Smuzhiyun #include <asm-generic/kprobes.h> 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #define BREAKPOINT_INSTRUCTION 0x0002 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #define FIXUP_PSW_NORMAL 0x08 23*4882a593Smuzhiyun #define FIXUP_BRANCH_NOT_TAKEN 0x04 24*4882a593Smuzhiyun #define FIXUP_RETURN_REGISTER 0x02 25*4882a593Smuzhiyun #define FIXUP_NOT_REQUIRED 0x01 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun int probe_is_prohibited_opcode(u16 *insn); 28*4882a593Smuzhiyun int probe_get_fixup_type(u16 *insn); 29*4882a593Smuzhiyun int probe_is_insn_relative_long(u16 *insn); 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun #ifdef CONFIG_KPROBES 32*4882a593Smuzhiyun #include <linux/ptrace.h> 33*4882a593Smuzhiyun #include <linux/percpu.h> 34*4882a593Smuzhiyun #include <linux/sched/task_stack.h> 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #define __ARCH_WANT_KPROBES_INSN_SLOT 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun struct pt_regs; 39*4882a593Smuzhiyun struct kprobe; 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun typedef u16 kprobe_opcode_t; 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun /* Maximum instruction size is 3 (16bit) halfwords: */ 44*4882a593Smuzhiyun #define MAX_INSN_SIZE 0x0003 45*4882a593Smuzhiyun #define MAX_STACK_SIZE 64 46*4882a593Smuzhiyun #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ 47*4882a593Smuzhiyun (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \ 48*4882a593Smuzhiyun ? (MAX_STACK_SIZE) \ 49*4882a593Smuzhiyun : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun #define kretprobe_blacklist_size 0 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun /* Architecture specific copy of original instruction */ 54*4882a593Smuzhiyun struct arch_specific_insn { 55*4882a593Smuzhiyun /* copy of original instruction */ 56*4882a593Smuzhiyun kprobe_opcode_t *insn; 57*4882a593Smuzhiyun }; 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun struct prev_kprobe { 60*4882a593Smuzhiyun struct kprobe *kp; 61*4882a593Smuzhiyun unsigned long status; 62*4882a593Smuzhiyun }; 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun /* per-cpu kprobe control block */ 65*4882a593Smuzhiyun struct kprobe_ctlblk { 66*4882a593Smuzhiyun unsigned long kprobe_status; 67*4882a593Smuzhiyun unsigned long kprobe_saved_imask; 68*4882a593Smuzhiyun unsigned long kprobe_saved_ctl[3]; 69*4882a593Smuzhiyun struct prev_kprobe prev_kprobe; 70*4882a593Smuzhiyun }; 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun void arch_remove_kprobe(struct kprobe *p); 73*4882a593Smuzhiyun void kretprobe_trampoline(void); 74*4882a593Smuzhiyun 75*4882a593Smuzhiyun int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 76*4882a593Smuzhiyun int kprobe_exceptions_notify(struct notifier_block *self, 77*4882a593Smuzhiyun unsigned long val, void *data); 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun #define flush_insn_slot(p) do { } while (0) 80*4882a593Smuzhiyun 81*4882a593Smuzhiyun #endif /* CONFIG_KPROBES */ 82*4882a593Smuzhiyun #endif /* _ASM_S390_KPROBES_H */ 83