1 /* 2 * Kernel Probes (KProbes) 3 * include/asm-mips/kprobes.h 4 * 5 * Copyright 2006 Sony Corp. 6 * Copyright 2010 Cavium Networks 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; version 2 of the License. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #ifndef _ASM_KPROBES_H 23 #define _ASM_KPROBES_H 24 25 #include <linux/ptrace.h> 26 #include <linux/types.h> 27 28 #include <asm/cacheflush.h> 29 #include <asm/kdebug.h> 30 #include <asm/inst.h> 31 32 #define __ARCH_WANT_KPROBES_INSN_SLOT 33 34 struct kprobe; 35 struct pt_regs; 36 37 typedef union mips_instruction kprobe_opcode_t; 38 39 #define MAX_INSN_SIZE 2 40 41 #define flush_insn_slot(p) \ 42 do { \ 43 flush_icache_range((unsigned long)p->addr, \ 44 (unsigned long)p->addr + \ 45 (MAX_INSN_SIZE * sizeof(kprobe_opcode_t))); \ 46 } while (0) 47 48 49 #define kretprobe_blacklist_size 0 50 51 void arch_remove_kprobe(struct kprobe *p); 52 53 /* Architecture specific copy of original instruction*/ 54 struct arch_specific_insn { 55 /* copy of the original instruction */ 56 kprobe_opcode_t *insn; 57 }; 58 59 struct prev_kprobe { 60 struct kprobe *kp; 61 unsigned long status; 62 unsigned long old_SR; 63 unsigned long saved_SR; 64 unsigned long saved_epc; 65 }; 66 67 #define MAX_JPROBES_STACK_SIZE 128 68 #define MAX_JPROBES_STACK_ADDR \ 69 (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 - sizeof(struct pt_regs)) 70 71 #define MIN_JPROBES_STACK_SIZE(ADDR) \ 72 ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR) \ 73 ? MAX_JPROBES_STACK_ADDR - (ADDR) \ 74 : MAX_JPROBES_STACK_SIZE) 75 76 77 #define SKIP_DELAYSLOT 0x0001 78 79 /* per-cpu kprobe control block */ 80 struct kprobe_ctlblk { 81 unsigned long kprobe_status; 82 unsigned long kprobe_old_SR; 83 unsigned long kprobe_saved_SR; 84 unsigned long kprobe_saved_epc; 85 unsigned long jprobe_saved_sp; 86 struct pt_regs jprobe_saved_regs; 87 /* Per-thread fields, used while emulating branches */ 88 unsigned long flags; 89 unsigned long target_epc; 90 u8 jprobes_stack[MAX_JPROBES_STACK_SIZE]; 91 struct prev_kprobe prev_kprobe; 92 }; 93 94 extern int kprobe_exceptions_notify(struct notifier_block *self, 95 unsigned long val, void *data); 96 97 #endif /* _ASM_KPROBES_H */ 98