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 <linux/ptrace.h>
  26 #include <linux/types.h>
  27
  28 #include <asm/cacheflush.h>
  29 #include <asm/kdebug.h>
  30 #include <asm/inst.h>
  31
  32 #define  __ARCH_WANT_KPROBES_INSN_SLOT
  33
  34 struct kprobe;
  35 struct pt_regs;
  36
  37 typedef union mips_instruction kprobe_opcode_t;
  38
  39 #define MAX_INSN_SIZE 2
  40
  41 #define flush_insn_slot(p)                                              \
  42 do {                                                                    \
  43         flush_icache_range((unsigned long)p->addr,                      \
  44                            (unsigned long)p->addr +                     \
  45                            (MAX_INSN_SIZE * sizeof(kprobe_opcode_t)));  \
  46 } while (0)
  47
  48
  49 #define kretprobe_blacklist_size 0
  50
  51 void arch_remove_kprobe(struct kprobe *p);
  52
  53 /* Architecture specific copy of original instruction*/
  54 struct arch_specific_insn {
  55         /* copy of the original instruction */
  56         kprobe_opcode_t *insn;
  57 };
  58
  59 struct prev_kprobe {
  60         struct kprobe *kp;
  61         unsigned long status;
  62         unsigned long old_SR;
  63         unsigned long saved_SR;
  64         unsigned long saved_epc;
  65 };
  66
  67 #define MAX_JPROBES_STACK_SIZE 128
  68 #define MAX_JPROBES_STACK_ADDR \
  69         (((unsigned long)current_thread_info()) + THREAD_SIZE - 32 - sizeof(struct pt_regs))
  70
  71 #define MIN_JPROBES_STACK_SIZE(ADDR)                                    \
  72         ((((ADDR) + MAX_JPROBES_STACK_SIZE) > MAX_JPROBES_STACK_ADDR)   \
  73                 ? MAX_JPROBES_STACK_ADDR - (ADDR)                       \
  74                 : MAX_JPROBES_STACK_SIZE)
  75
  76
  77 #define SKIP_DELAYSLOT 0x0001
  78
  79 /* per-cpu kprobe control block */
  80 struct kprobe_ctlblk {
  81         unsigned long kprobe_status;
  82         unsigned long kprobe_old_SR;
  83         unsigned long kprobe_saved_SR;
  84         unsigned long kprobe_saved_epc;
  85         unsigned long jprobe_saved_sp;
  86         struct pt_regs jprobe_saved_regs;
  87         /* Per-thread fields, used while emulating branches */
  88         unsigned long flags;
  89         unsigned long target_epc;
  90         u8 jprobes_stack[MAX_JPROBES_STACK_SIZE];
  91         struct prev_kprobe prev_kprobe;
  92 };
  93
  94 extern int kprobe_exceptions_notify(struct notifier_block *self,
  95                                     unsigned long val, void *data);
  96
  97 #endif                          /* _ASM_KPROBES_H */