arch/tile/include/asm/kprobes.h

   1 /*
   2  * arch/tile/include/asm/kprobes.h
   3  *
   4  * Copyright 2012 Tilera Corporation. All Rights Reserved.
   5  *
   6  *   This program is free software; you can redistribute it and/or
   7  *   modify it under the terms of the GNU General Public License
   8  *   as published by the Free Software Foundation, version 2.
   9  *
  10  *   This program is distributed in the hope that it will be useful, but
  11  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  13  *   NON INFRINGEMENT.  See the GNU General Public License for
  14  *   more details.
  15  */
  16
  17 #ifndef _ASM_TILE_KPROBES_H
  18 #define _ASM_TILE_KPROBES_H
  19
  20 #include <asm-generic/kprobes.h>
  21
  22 #ifdef CONFIG_KPROBES
  23
  24 #include <linux/types.h>
  25 #include <linux/ptrace.h>
  26 #include <linux/percpu.h>
  27 #include <arch/opcode.h>
  28
  29 #define __ARCH_WANT_KPROBES_INSN_SLOT
  30 #define MAX_INSN_SIZE                   2
  31
  32 #define kretprobe_blacklist_size 0
  33
  34 typedef tile_bundle_bits kprobe_opcode_t;
  35
  36 #define flush_insn_slot(p)                                              \
  37         flush_icache_range((unsigned long)p->addr,                      \
  38                            (unsigned long)p->addr +                     \
  39                            (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
  40
  41 struct kprobe;
  42
  43 /* Architecture specific copy of original instruction. */
  44 struct arch_specific_insn {
  45         kprobe_opcode_t *insn;
  46 };
  47
  48 struct prev_kprobe {
  49         struct kprobe *kp;
  50         unsigned long status;
  51         unsigned long saved_pc;
  52 };
  53
  54 #define MAX_JPROBES_STACK_SIZE 128
  55 #define MAX_JPROBES_STACK_ADDR \
  56         (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 \
  57                 - sizeof(struct pt_regs))
  58
  59 #define MIN_JPROBES_STACK_SIZE(ADDR)                                    \
  60         ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR)   \
  61                 ? MAX_JPROBES_STACK_ADDR - (ADDR)                       \
  62                 : MAX_JPROBES_STACK_SIZE)
  63
  64 /* per-cpu kprobe control block. */
  65 struct kprobe_ctlblk {
  66         unsigned long kprobe_status;
  67         unsigned long kprobe_saved_pc;
  68         unsigned long jprobe_saved_sp;
  69         struct prev_kprobe prev_kprobe;
  70         struct pt_regs jprobe_saved_regs;
  71         char jprobes_stack[MAX_JPROBES_STACK_SIZE];
  72 };
  73
  74 extern tile_bundle_bits breakpoint2_insn;
  75 extern tile_bundle_bits breakpoint_insn;
  76
  77 void arch_remove_kprobe(struct kprobe *);
  78
  79 extern int kprobe_exceptions_notify(struct notifier_block *self,
  80                              unsigned long val, void *data);
  81
  82 #endif /* CONFIG_KPROBES */
  83 #endif /* _ASM_TILE_KPROBES_H */