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 struct arch_hw_breakpoint {
  28         unsigned long   address;
  29         u16             type;
  30         u16             len; /* length of the target data symbol */
  31 };
  32
  33 /* Note: Don't change the the first 6 bits below as they are in the same order
  34  * as the dabr and dabrx.
  35  */
  36 #define HW_BRK_TYPE_READ                0x01
  37 #define HW_BRK_TYPE_WRITE               0x02
  38 #define HW_BRK_TYPE_TRANSLATE           0x04
  39 #define HW_BRK_TYPE_USER                0x08
  40 #define HW_BRK_TYPE_KERNEL              0x10
  41 #define HW_BRK_TYPE_HYP                 0x20
  42 #define HW_BRK_TYPE_EXTRANEOUS_IRQ      0x80
  43
  44 /* bits that overlap with the bottom 3 bits of the dabr */
  45 #define HW_BRK_TYPE_RDWR        (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
  46 #define HW_BRK_TYPE_DABR        (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
  47 #define HW_BRK_TYPE_PRIV_ALL    (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
  48                                  HW_BRK_TYPE_HYP)
  49
  50 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  51 #include <linux/kdebug.h>
  52 #include <asm/reg.h>
  53 #include <asm/debug.h>
  54
  55 struct perf_event_attr;
  56 struct perf_event;
  57 struct pmu;
  58 struct perf_sample_data;
  59 struct task_struct;
  60
  61 #define HW_BREAKPOINT_ALIGN 0x7
  62
  63 extern int hw_breakpoint_slots(int type);
  64 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  65 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
  66 extern int hw_breakpoint_arch_parse(struct perf_event *bp,
  67                                     const struct perf_event_attr *attr,
  68                                     struct arch_hw_breakpoint *hw);
  69 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  70                                                 unsigned long val, void *data);
  71 int arch_install_hw_breakpoint(struct perf_event *bp);
  72 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  73 void arch_unregister_hw_breakpoint(struct perf_event *bp);
  74 void hw_breakpoint_pmu_read(struct perf_event *bp);
  75 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  76
  77 extern struct pmu perf_ops_bp;
  78 extern void ptrace_triggered(struct perf_event *bp,
  79                         struct perf_sample_data *data, struct pt_regs *regs);
  80 static inline void hw_breakpoint_disable(void)
  81 {
  82         struct arch_hw_breakpoint brk;
  83
  84         brk.address = 0;
  85         brk.type = 0;
  86         brk.len = 0;
  87         if (ppc_breakpoint_available())
  88                 __set_breakpoint(&brk);
  89 }
  90 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  91 int hw_breakpoint_handler(struct die_args *args);
  92
  93 extern int set_dawr(struct arch_hw_breakpoint *brk);
  94 extern bool dawr_force_enable;
  95 static inline bool dawr_enabled(void)
  96 {
  97         return dawr_force_enable;
  98 }
  99
 100 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
 101 static inline void hw_breakpoint_disable(void) { }
 102 static inline void thread_change_pc(struct task_struct *tsk,
 103                                         struct pt_regs *regs) { }
 104 static inline bool dawr_enabled(void) { return false; }
 105 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
 106 #endif  /* __KERNEL__ */
 107 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */