1 #ifndef _ASM_KPROBES_H 2 #define _ASM_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 (C) IBM Corporation, 2002, 2004 21 * Copyright (C) Intel Corporation, 2005 22 * 23 * 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy 24 * <anil.s.keshavamurthy@intel.com> adapted from i386 25 */ 26 #include <linux/types.h> 27 #include <linux/ptrace.h> 28 #include <linux/percpu.h> 29 #include <asm/break.h> 30 31 #define __ARCH_WANT_KPROBES_INSN_SLOT 32 #define MAX_INSN_SIZE 2 /* last half is for kprobe-booster */ 33 #define BREAK_INST (long)(__IA64_BREAK_KPROBE << 6) 34 #define NOP_M_INST (long)(1<<27) 35 #define BRL_INST(i1, i2) ((long)((0xcL << 37) | /* brl */ \ 36 (0x1L << 12) | /* many */ \ 37 (((i1) & 1) << 36) | ((i2) << 13))) /* imm */ 38 39 typedef union cmp_inst { 40 struct { 41 unsigned long long qp : 6; 42 unsigned long long p1 : 6; 43 unsigned long long c : 1; 44 unsigned long long r2 : 7; 45 unsigned long long r3 : 7; 46 unsigned long long p2 : 6; 47 unsigned long long ta : 1; 48 unsigned long long x2 : 2; 49 unsigned long long tb : 1; 50 unsigned long long opcode : 4; 51 unsigned long long reserved : 23; 52 }f; 53 unsigned long long l; 54 } cmp_inst_t; 55 56 struct kprobe; 57 58 typedef struct _bundle { 59 struct { 60 unsigned long long template : 5; 61 unsigned long long slot0 : 41; 62 unsigned long long slot1_p0 : 64-46; 63 } quad0; 64 struct { 65 unsigned long long slot1_p1 : 41 - (64-46); 66 unsigned long long slot2 : 41; 67 } quad1; 68 } __attribute__((__aligned__(16))) bundle_t; 69 70 struct prev_kprobe { 71 struct kprobe *kp; 72 unsigned long status; 73 }; 74 75 #define MAX_PARAM_RSE_SIZE (0x60+0x60/0x3f) 76 /* per-cpu kprobe control block */ 77 #define ARCH_PREV_KPROBE_SZ 2 78 struct kprobe_ctlblk { 79 unsigned long kprobe_status; 80 struct pt_regs jprobe_saved_regs; 81 unsigned long jprobes_saved_stacked_regs[MAX_PARAM_RSE_SIZE]; 82 unsigned long *bsp; 83 unsigned long cfm; 84 atomic_t prev_kprobe_index; 85 struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ]; 86 }; 87 88 #define kretprobe_blacklist_size 0 89 90 #define SLOT0_OPCODE_SHIFT (37) 91 #define SLOT1_p1_OPCODE_SHIFT (37 - (64-46)) 92 #define SLOT2_OPCODE_SHIFT (37) 93 94 #define INDIRECT_CALL_OPCODE (1) 95 #define IP_RELATIVE_CALL_OPCODE (5) 96 #define IP_RELATIVE_BRANCH_OPCODE (4) 97 #define IP_RELATIVE_PREDICT_OPCODE (7) 98 #define LONG_BRANCH_OPCODE (0xC) 99 #define LONG_CALL_OPCODE (0xD) 100 #define flush_insn_slot(p) do { } while (0) 101 102 typedef struct kprobe_opcode { 103 bundle_t bundle; 104 } kprobe_opcode_t; 105 106 /* Architecture specific copy of original instruction*/ 107 struct arch_specific_insn { 108 /* copy of the instruction to be emulated */ 109 kprobe_opcode_t *insn; 110 #define INST_FLAG_FIX_RELATIVE_IP_ADDR 1 111 #define INST_FLAG_FIX_BRANCH_REG 2 112 #define INST_FLAG_BREAK_INST 4 113 #define INST_FLAG_BOOSTABLE 8 114 unsigned long inst_flag; 115 unsigned short target_br_reg; 116 unsigned short slot; 117 }; 118 119 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 120 extern int kprobe_exceptions_notify(struct notifier_block *self, 121 unsigned long val, void *data); 122 123 extern void invalidate_stacked_regs(void); 124 extern void flush_register_stack(void); 125 extern void arch_remove_kprobe(struct kprobe *p); 126 127 #endif /* _ASM_KPROBES_H */ 128