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 <linux/ptrace.h> 32 #include <linux/percpu.h> 33 34 #define __ARCH_WANT_KPROBES_INSN_SLOT 35 36 struct pt_regs; 37 struct kprobe; 38 39 typedef u16 kprobe_opcode_t; 40 #define BREAKPOINT_INSTRUCTION 0x0002 41 42 /* Maximum instruction size is 3 (16bit) halfwords: */ 43 #define MAX_INSN_SIZE 0x0003 44 #define MAX_STACK_SIZE 64 45 #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \ 46 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \ 47 ? (MAX_STACK_SIZE) \ 48 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) 49 50 #define kretprobe_blacklist_size 0 51 52 #define KPROBE_SWAP_INST 0x10 53 54 #define FIXUP_PSW_NORMAL 0x08 55 #define FIXUP_BRANCH_NOT_TAKEN 0x04 56 #define FIXUP_RETURN_REGISTER 0x02 57 #define FIXUP_NOT_REQUIRED 0x01 58 59 /* Architecture specific copy of original instruction */ 60 struct arch_specific_insn { 61 /* copy of original instruction */ 62 kprobe_opcode_t *insn; 63 unsigned int is_ftrace_insn : 1; 64 }; 65 66 struct prev_kprobe { 67 struct kprobe *kp; 68 unsigned long status; 69 }; 70 71 /* per-cpu kprobe control block */ 72 struct kprobe_ctlblk { 73 unsigned long kprobe_status; 74 unsigned long kprobe_saved_imask; 75 unsigned long kprobe_saved_ctl[3]; 76 struct prev_kprobe prev_kprobe; 77 struct pt_regs jprobe_saved_regs; 78 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; 79 }; 80 81 void arch_remove_kprobe(struct kprobe *p); 82 void kretprobe_trampoline(void); 83 84 int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 85 int kprobe_exceptions_notify(struct notifier_block *self, 86 unsigned long val, void *data); 87 88 int probe_is_prohibited_opcode(u16 *insn); 89 int probe_get_fixup_type(u16 *insn); 90 int probe_is_insn_relative_long(u16 *insn); 91 92 #define flush_insn_slot(p) do { } while (0) 93 94 #endif /* _ASM_S390_KPROBES_H */ 95