LXR linux/arch/powerpc/include/asm/hw

   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
  29struct arch_hw_breakpoint {
  30        bool            extraneous_interrupt;
  31        u8              len; /* length of the target data symbol */
  32        int             type;
  33        unsigned long   address;
  34};
  35
  36#include <linux/kdebug.h>
  37#include <asm/reg.h>
  38#include <asm/system.h>
  39
  40struct perf_event;
  41struct pmu;
  42struct perf_sample_data;
  43
  44#define HW_BREAKPOINT_ALIGN 0x7
  45/* Maximum permissible length of any HW Breakpoint */
  46#define HW_BREAKPOINT_LEN 0x8
  47
  48extern int hw_breakpoint_slots(int type);
  49extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  50extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
  51extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
  52extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  53                                                unsigned long val, void *data);
  54int arch_install_hw_breakpoint(struct perf_event *bp);
  55void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  56void hw_breakpoint_pmu_read(struct perf_event *bp);
  57extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  58
  59extern struct pmu perf_ops_bp;
  60extern void ptrace_triggered(struct perf_event *bp, int nmi,
  61                        struct perf_sample_data *data, struct pt_regs *regs);
  62static inline void hw_breakpoint_disable(void)
  63{
  64        set_dabr(0);
  65}
  66extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  67
  68#else   /* CONFIG_HAVE_HW_BREAKPOINT */
  69static inline void hw_breakpoint_disable(void) { }
  70static inline void thread_change_pc(struct task_struct *tsk,
  71                                        struct pt_regs *regs) { }
  72#endif  /* CONFIG_HAVE_HW_BREAKPOINT */
  73#endif  /* __KERNEL__ */
  74#endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
  75