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 if (p->addr) \ 44 flush_icache_range((unsigned long)p->addr, \ 45 (unsigned long)p->addr + \ 46 (MAX_INSN_SIZE * sizeof(kprobe_opcode_t))); \ 47 } while (0) 48 49 50 #define kretprobe_blacklist_size 0 51 52 void arch_remove_kprobe(struct kprobe *p); 53 54 /* Architecture specific copy of original instruction*/ 55 struct arch_specific_insn { 56 /* copy of the original instruction */ 57 kprobe_opcode_t *insn; 58 }; 59 60 struct prev_kprobe { 61 struct kprobe *kp; 62 unsigned long status; 63 unsigned long old_SR; 64 unsigned long saved_SR; 65 unsigned long saved_epc; 66 }; 67 68 #define MAX_JPROBES_STACK_SIZE 128 69 #define MAX_JPROBES_STACK_ADDR \ 70 (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 - sizeof(struct pt_regs)) 71 72 #define MIN_JPROBES_STACK_SIZE(ADDR) \ 73 ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR) \ 74 ? MAX_JPROBES_STACK_ADDR - (ADDR) \ 75 : MAX_JPROBES_STACK_SIZE) 76 77 78 #define SKIP_DELAYSLOT 0x0001 79 80 /* per-cpu kprobe control block */ 81 struct kprobe_ctlblk { 82 unsigned long kprobe_status; 83 unsigned long kprobe_old_SR; 84 unsigned long kprobe_saved_SR; 85 unsigned long kprobe_saved_epc; 86 unsigned long jprobe_saved_sp; 87 struct pt_regs jprobe_saved_regs; 88 /* Per-thread fields, used while emulating branches */ 89 unsigned long flags; 90 unsigned long target_epc; 91 u8 jprobes_stack[MAX_JPROBES_STACK_SIZE]; 92 struct prev_kprobe prev_kprobe; 93 }; 94 95 extern int kprobe_exceptions_notify(struct notifier_block *self, 96 unsigned long val, void *data); 97 98 #endif /* _ASM_KPROBES_H */ 99