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
 31typedef 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
 48struct kprobe;
 49
 50typedef 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
 62struct 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
 70struct 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
 92typedef struct kprobe_opcode {
 93	bundle_t bundle;
 94} kprobe_opcode_t;
 95
 96/* Architecture specific copy of original instruction*/
 97struct 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
109extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
110extern int kprobe_exceptions_notify(struct notifier_block *self,
111				    unsigned long val, void *data);
112
113extern void invalidate_stacked_regs(void);
114extern void flush_register_stack(void);
115extern void arch_remove_kprobe(struct kprobe *p);
116
117#endif /* CONFIG_KPROBES */
118#endif /* _ASM_KPROBES_H */