1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_KPROBES_H 3 #define _ASM_KPROBES_H 4 /* 5 * Kernel Probes (KProbes) 6 * 7 * Copyright (C) IBM Corporation, 2002, 2004 8 * Copyright (C) Intel Corporation, 2005 9 * 10 * 2005-Apr Rusty Lynch <rusty.lynch@intel.com> and Anil S Keshavamurthy 11 * <anil.s.keshavamurthy@intel.com> adapted from i386 12 */ 13 #include <asm-generic/kprobes.h> 14 #include <asm/break.h> 15 16 #define BREAK_INST (long)(__IA64_BREAK_KPROBE << 6) 17 18 #ifdef CONFIG_KPROBES 19 20 #include <linux/types.h> 21 #include <linux/ptrace.h> 22 #include <linux/percpu.h> 23 24 #define __ARCH_WANT_KPROBES_INSN_SLOT 25 #define MAX_INSN_SIZE 2 /* last half is for kprobe-booster */ 26 #define NOP_M_INST (long)(1<<27) 27 #define BRL_INST(i1, i2) ((long)((0xcL << 37) | /* brl */ \ 28 (0x1L << 12) | /* many */ \ 29 (((i1) & 1) << 36) | ((i2) << 13))) /* imm */ 30 31 typedef union cmp_inst { 32 struct { 33 unsigned long long qp : 6; 34 unsigned long long p1 : 6; 35 unsigned long long c : 1; 36 unsigned long long r2 : 7; 37 unsigned long long r3 : 7; 38 unsigned long long p2 : 6; 39 unsigned long long ta : 1; 40 unsigned long long x2 : 2; 41 unsigned long long tb : 1; 42 unsigned long long opcode : 4; 43 unsigned long long reserved : 23; 44 }f; 45 unsigned long long l; 46 } cmp_inst_t; 47 48 struct kprobe; 49 50 typedef struct _bundle { 51 struct { 52 unsigned long long template : 5; 53 unsigned long long slot0 : 41; 54 unsigned long long slot1_p0 : 64-46; 55 } quad0; 56 struct { 57 unsigned long long slot1_p1 : 41 - (64-46); 58 unsigned long long slot2 : 41; 59 } quad1; 60 } __attribute__((__aligned__(16))) bundle_t; 61 62 struct prev_kprobe { 63 struct kprobe *kp; 64 unsigned long status; 65 }; 66 67 #define MAX_PARAM_RSE_SIZE (0x60+0x60/0x3f) 68 /* per-cpu kprobe control block */ 69 #define ARCH_PREV_KPROBE_SZ 2 70 struct kprobe_ctlblk { 71 unsigned long kprobe_status; 72 unsigned long *bsp; 73 unsigned long cfm; 74 atomic_t prev_kprobe_index; 75 struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ]; 76 }; 77 78 #define kretprobe_blacklist_size 0 79 80 #define SLOT0_OPCODE_SHIFT (37) 81 #define SLOT1_p1_OPCODE_SHIFT (37 - (64-46)) 82 #define SLOT2_OPCODE_SHIFT (37) 83 84 #define INDIRECT_CALL_OPCODE (1) 85 #define IP_RELATIVE_CALL_OPCODE (5) 86 #define IP_RELATIVE_BRANCH_OPCODE (4) 87 #define IP_RELATIVE_PREDICT_OPCODE (7) 88 #define LONG_BRANCH_OPCODE (0xC) 89 #define LONG_CALL_OPCODE (0xD) 90 #define flush_insn_slot(p) do { } while (0) 91 92 typedef struct kprobe_opcode { 93 bundle_t bundle; 94 } kprobe_opcode_t; 95 96 /* Architecture specific copy of original instruction*/ 97 struct arch_specific_insn { 98 /* copy of the instruction to be emulated */ 99 kprobe_opcode_t *insn; 100 #define INST_FLAG_FIX_RELATIVE_IP_ADDR 1 101 #define INST_FLAG_FIX_BRANCH_REG 2 102 #define INST_FLAG_BREAK_INST 4 103 #define INST_FLAG_BOOSTABLE 8 104 unsigned long inst_flag; 105 unsigned short target_br_reg; 106 unsigned short slot; 107 }; 108 109 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 110 extern int kprobe_exceptions_notify(struct notifier_block *self, 111 unsigned long val, void *data); 112 113 extern void invalidate_stacked_regs(void); 114 extern void flush_register_stack(void); 115 extern void arch_remove_kprobe(struct kprobe *p); 116 117 #endif /* CONFIG_KPROBES */ 118 #endif /* _ASM_KPROBES_H */ 119