arch/powerpc/include/asm/hw_breakpoint.h

   1 /*
   2  * PowerPC BookIII S hardware breakpoint definitions
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright 2010, IBM Corporation.
  19  * Author: K.Prasad <prasad@linux.vnet.ibm.com>
  20  *
  21  */
  22
  23 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
  24 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
  25
  26 #ifdef  __KERNEL__
  27 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  28
  29 struct arch_hw_breakpoint {
  30         unsigned long   address;
  31         unsigned long   dabrx;
  32         int             type;
  33         u8              len; /* length of the target data symbol */
  34         bool            extraneous_interrupt;
  35 };
  36
  37 #include <linux/kdebug.h>
  38 #include <asm/reg.h>
  39 #include <asm/debug.h>
  40
  41 struct perf_event;
  42 struct pmu;
  43 struct perf_sample_data;
  44
  45 #define HW_BREAKPOINT_ALIGN 0x7
  46 /* Maximum permissible length of any HW Breakpoint */
  47 #define HW_BREAKPOINT_LEN 0x8
  48
  49 extern int hw_breakpoint_slots(int type);
  50 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  51 extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
  52 extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
  53 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  54                                                 unsigned long val, void *data);
  55 int arch_install_hw_breakpoint(struct perf_event *bp);
  56 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  57 void hw_breakpoint_pmu_read(struct perf_event *bp);
  58 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  59
  60 extern struct pmu perf_ops_bp;
  61 extern void ptrace_triggered(struct perf_event *bp,
  62                         struct perf_sample_data *data, struct pt_regs *regs);
  63 static inline void hw_breakpoint_disable(void)
  64 {
  65         set_dabr(0, 0);
  66 }
  67 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  68
  69 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
  70 static inline void hw_breakpoint_disable(void) { }
  71 static inline void thread_change_pc(struct task_struct *tsk,
  72                                         struct pt_regs *regs) { }
  73 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
  74 #endif  /* __KERNEL__ */
  75 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */