1 #ifndef _ASM_S390_KPROBES_H 2 #define _ASM_S390_KPROBES_H 3 /* 4 * Kernel Probes (KProbes) 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 * 20 * Copyright IBM Corp. 2002, 2006 21 * 22 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel 23 * Probes initial implementation ( includes suggestions from 24 * Rusty Russell). 25 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli 26 * <ananth@in.ibm.com> 27 * 2005-Dec Used as a template for s390 by Mike Grundy 28 * <grundym@us.ibm.com> 29 */ 30 #include <linux/types.h> 31 #include <asm-generic/kprobes.h> 32 33 #define BREAKPOINT_INSTRUCTION 0x0002 34 35 #define FIXUP_PSW_NORMAL 0x08 36 #define FIXUP_BRANCH_NOT_TAKEN 0x04 37 #define FIXUP_RETURN_REGISTER 0x02 38 #define FIXUP_NOT_REQUIRED 0x01 39 40 int probe_is_prohibited_opcode(u16 *insn); 41 int probe_get_fixup_type(u16 *insn); 42 int probe_is_insn_relative_long(u16 *insn); 43 44 #ifdef CONFIG_KPROBES 45 #include <linux/ptrace.h> 46 #include <linux/percpu.h> 47 #include <linux/sched/task_stack.h> 48 49 #define __ARCH_WANT_KPROBES_INSN_SLOT 50 51 struct pt_regs; 52 struct kprobe; 53 54 typedef u16 kprobe_opcode_t; 55 56 /* Maximum instruction size is 3 (16bit) halfwords: */ 57 #define MAX_INSN_SIZE 0x0003 58 #define MAX_STACK_SIZE 64 59 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ 60 (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \ 61 ? (MAX_STACK_SIZE) \ 62 : (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) 63 64 #define kretprobe_blacklist_size 0 65 66 /* Architecture specific copy of original instruction */ 67 struct arch_specific_insn { 68 /* copy of original instruction */ 69 kprobe_opcode_t *insn; 70 unsigned int is_ftrace_insn : 1; 71 }; 72 73 struct prev_kprobe { 74 struct kprobe *kp; 75 unsigned long status; 76 }; 77 78 /* per-cpu kprobe control block */ 79 struct kprobe_ctlblk { 80 unsigned long kprobe_status; 81 unsigned long kprobe_saved_imask; 82 unsigned long kprobe_saved_ctl[3]; 83 struct prev_kprobe prev_kprobe; 84 struct pt_regs jprobe_saved_regs; 85 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 86 }; 87 88 void arch_remove_kprobe(struct kprobe *p); 89 void kretprobe_trampoline(void); 90 91 int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 92 int kprobe_exceptions_notify(struct notifier_block *self, 93 unsigned long val, void *data); 94 95 #define flush_insn_slot(p) do { } while (0) 96 97 #endif /* CONFIG_KPROBES */ 98 #endif /* _ASM_S390_KPROBES_H */ 99