arch/mips/include/asm/kprobes.h

   1 /*
   2  *  Kernel Probes (KProbes)
   3  *  include/asm-mips/kprobes.h
   4  *
   5  *  Copyright 2006 Sony Corp.
   6  *  Copyright 2010 Cavium Networks
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; version 2 of the License.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #ifndef _ASM_KPROBES_H
  23 #define _ASM_KPROBES_H
  24
  25 #include <asm-generic/kprobes.h>
  26
  27 #ifdef CONFIG_KPROBES
  28 #include <linux/ptrace.h>
  29 #include <linux/types.h>
  30
  31 #include <asm/cacheflush.h>
  32 #include <asm/kdebug.h>
  33 #include <asm/inst.h>
  34
  35 #define  __ARCH_WANT_KPROBES_INSN_SLOT
  36
  37 struct kprobe;
  38 struct pt_regs;
  39
  40 typedef union mips_instruction kprobe_opcode_t;
  41
  42 #define MAX_INSN_SIZE 2
  43
  44 #define flush_insn_slot(p)                                              \
  45 do {                                                                    \
  46         if (p->addr)                                                    \
  47                 flush_icache_range((unsigned long)p->addr,              \
  48                            (unsigned long)p->addr +                     \
  49                            (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)));  \
  50 } while (0)
  51
  52
  53 #define kretprobe_blacklist_size 0
  54
  55 void arch_remove_kprobe(struct kprobe *p);
  56
  57 /* Architecture specific copy of original instruction*/
  58 struct arch_specific_insn {
  59         /* copy of the original instruction */
  60         kprobe_opcode_t *insn;
  61 };
  62
  63 struct prev_kprobe {
  64         struct kprobe *kp;
  65         unsigned long status;
  66         unsigned long old_SR;
  67         unsigned long saved_SR;
  68         unsigned long saved_epc;
  69 };
  70
  71 #define MAX_JPROBES_STACK_SIZE 128
  72 #define MAX_JPROBES_STACK_ADDR \
  73         (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 - sizeof(struct pt_regs))
  74
  75 #define MIN_JPROBES_STACK_SIZE(ADDR)                                    \
  76         ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR)   \
  77                 ? MAX_JPROBES_STACK_ADDR - (ADDR)                       \
  78                 : MAX_JPROBES_STACK_SIZE)
  79
  80
  81 #define SKIP_DELAYSLOT 0x0001
  82
  83 /* per-cpu kprobe control block */
  84 struct kprobe_ctlblk {
  85         unsigned long kprobe_status;
  86         unsigned long kprobe_old_SR;
  87         unsigned long kprobe_saved_SR;
  88         unsigned long kprobe_saved_epc;
  89         unsigned long jprobe_saved_sp;
  90         struct pt_regs jprobe_saved_regs;
  91         /* Per-thread fields, used while emulating branches */
  92         unsigned long flags;
  93         unsigned long target_epc;
  94         u8 jprobes_stack[MAX_JPROBES_STACK_SIZE];
  95         struct prev_kprobe prev_kprobe;
  96 };
  97
  98 extern int kprobe_exceptions_notify(struct notifier_block *self,
  99                                     unsigned long val, void *data);
 100
 101 #endif /* CONFIG_KPROBES */
 102 #endif /* _ASM_KPROBES_H */