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/ctlreg.h> 19 #include <asm-generic/kprobes.h> 20 21 #define BREAKPOINT_INSTRUCTION 0x0002 22 23 #define FIXUP_PSW_NORMAL 0x08 24 #define FIXUP_BRANCH_NOT_TAKEN 0x04 25 #define FIXUP_RETURN_REGISTER 0x02 26 #define FIXUP_NOT_REQUIRED 0x01 27 28 int probe_is_prohibited_opcode(u16 *insn); 29 int probe_get_fixup_type(u16 *insn); 30 int probe_is_insn_relative_long(u16 *insn); 31 32 #ifdef CONFIG_KPROBES 33 #include <linux/ptrace.h> 34 #include <linux/percpu.h> 35 #include <linux/sched/task_stack.h> 36 37 #define __ARCH_WANT_KPROBES_INSN_SLOT 38 39 struct pt_regs; 40 struct kprobe; 41 42 typedef u16 kprobe_opcode_t; 43 44 /* Maximum instruction size is 3 (16bit) halfwords: */ 45 #define MAX_INSN_SIZE 0x0003 46 #define MAX_STACK_SIZE 64 47 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ 48 (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \ 49 ? (MAX_STACK_SIZE) \ 50 : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) 51 52 #define kretprobe_blacklist_size 0 53 54 /* Architecture specific copy of original instruction */ 55 struct arch_specific_insn { 56 /* copy of original instruction */ 57 kprobe_opcode_t *insn; 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 struct ctlreg kprobe_saved_ctl[3]; 70 struct prev_kprobe prev_kprobe; 71 }; 72 73 void arch_remove_kprobe(struct kprobe *p); 74 75 int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 76 77 #define flush_insn_slot(p) do { } while (0) 78 79 #endif /* CONFIG_KPROBES */ 80 #endif /* _ASM_S390_KPROBES_H */ 81