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 <linux/types.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/percpu.h>
  23
  24 #include <arch/opcode.h>
  25
  26 #define __ARCH_WANT_KPROBES_INSN_SLOT
  27 #define MAX_INSN_SIZE                   2
  28
  29 #define kretprobe_blacklist_size 0
  30
  31 typedef tile_bundle_bits kprobe_opcode_t;
  32
  33 #define flush_insn_slot(p)                                              \
  34         flush_icache_range((unsigned long)p->addr,                      \
  35                            (unsigned long)p->addr +                     \
  36                            (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
  37
  38 struct kprobe;
  39
  40 /* Architecture specific copy of original instruction. */
  41 struct arch_specific_insn {
  42         kprobe_opcode_t *insn;
  43 };
  44
  45 struct prev_kprobe {
  46         struct kprobe *kp;
  47         unsigned long status;
  48         unsigned long saved_pc;
  49 };
  50
  51 #define MAX_JPROBES_STACK_SIZE 128
  52 #define MAX_JPROBES_STACK_ADDR \
  53         (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 \
  54                 - sizeof(struct pt_regs))
  55
  56 #define MIN_JPROBES_STACK_SIZE(ADDR)                                    \
  57         ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR)   \
  58                 ? MAX_JPROBES_STACK_ADDR - (ADDR)                       \
  59                 : MAX_JPROBES_STACK_SIZE)
  60
  61 /* per-cpu kprobe control block. */
  62 struct kprobe_ctlblk {
  63         unsigned long kprobe_status;
  64         unsigned long kprobe_saved_pc;
  65         unsigned long jprobe_saved_sp;
  66         struct prev_kprobe prev_kprobe;
  67         struct pt_regs jprobe_saved_regs;
  68         char jprobes_stack[MAX_JPROBES_STACK_SIZE];
  69 };
  70
  71 extern tile_bundle_bits breakpoint2_insn;
  72 extern tile_bundle_bits breakpoint_insn;
  73
  74 void arch_remove_kprobe(struct kprobe *);
  75
  76 extern int kprobe_exceptions_notify(struct notifier_block *self,
  77                              unsigned long val, void *data);
  78
  79 #endif /* _ASM_TILE_KPROBES_H */