arch/ia64/include/asm/kprobes.h

   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 */