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__
  27struct 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
  55struct perf_event;
  56struct pmu;
  57struct perf_sample_data;
  58
  59#define HW_BREAKPOINT_ALIGN 0x7
  60
  61extern int hw_breakpoint_slots(int type);
  62extern int arch_bp_generic_fields(int type, int *gen_bp_type);
  63extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
  64extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
  65extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
  66                                                unsigned long val, void *data);
  67int arch_install_hw_breakpoint(struct perf_event *bp);
  68void arch_uninstall_hw_breakpoint(struct perf_event *bp);
  69void hw_breakpoint_pmu_read(struct perf_event *bp);
  70extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  71
  72extern struct pmu perf_ops_bp;
  73extern void ptrace_triggered(struct perf_event *bp,
  74                        struct perf_sample_data *data, struct pt_regs *regs);
  75static inline void hw_breakpoint_disable(void)
  76{
  77        struct arch_hw_breakpoint brk;
  78
  79        brk.address = 0;
  80        brk.type = 0;
  81        brk.len = 0;
  82        __set_breakpoint(&brk);
  83}
  84extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
  85
  86#else   /* CONFIG_HAVE_HW_BREAKPOINT */
  87static inline void hw_breakpoint_disable(void) { }
  88static inline void thread_change_pc(struct task_struct *tsk,
  89                                        struct pt_regs *regs) { }
  90#endif  /* CONFIG_HAVE_HW_BREAKPOINT */
  91#endif  /* __KERNEL__ */
  92#endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
  93