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Linux/arch/powerpc/include/asm/hw_breakpoint.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * PowerPC BookIII S hardware breakpoint definitions
  4  *
  5  * Copyright 2010, IBM Corporation.
  6  * Author: K.Prasad <prasad@linux.vnet.ibm.com>
  7  */
  8 
  9 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
 10 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
 11 
 12 #ifdef  __KERNEL__
 13 struct arch_hw_breakpoint {
 14         unsigned long   address;
 15         u16             type;
 16         u16             len; /* length of the target data symbol */
 17 };
 18 
 19 /* Note: Don't change the the first 6 bits below as they are in the same order
 20  * as the dabr and dabrx.
 21  */
 22 #define HW_BRK_TYPE_READ                0x01
 23 #define HW_BRK_TYPE_WRITE               0x02
 24 #define HW_BRK_TYPE_TRANSLATE           0x04
 25 #define HW_BRK_TYPE_USER                0x08
 26 #define HW_BRK_TYPE_KERNEL              0x10
 27 #define HW_BRK_TYPE_HYP                 0x20
 28 #define HW_BRK_TYPE_EXTRANEOUS_IRQ      0x80
 29 
 30 /* bits that overlap with the bottom 3 bits of the dabr */
 31 #define HW_BRK_TYPE_RDWR        (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE)
 32 #define HW_BRK_TYPE_DABR        (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE)
 33 #define HW_BRK_TYPE_PRIV_ALL    (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
 34                                  HW_BRK_TYPE_HYP)
 35 
 36 #ifdef CONFIG_HAVE_HW_BREAKPOINT
 37 #include <linux/kdebug.h>
 38 #include <asm/reg.h>
 39 #include <asm/debug.h>
 40 
 41 struct perf_event_attr;
 42 struct perf_event;
 43 struct pmu;
 44 struct perf_sample_data;
 45 struct task_struct;
 46 
 47 #define HW_BREAKPOINT_ALIGN 0x7
 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 arch_hw_breakpoint *hw);
 52 extern int hw_breakpoint_arch_parse(struct perf_event *bp,
 53                                     const struct perf_event_attr *attr,
 54                                     struct arch_hw_breakpoint *hw);
 55 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
 56                                                 unsigned long val, void *data);
 57 int arch_install_hw_breakpoint(struct perf_event *bp);
 58 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
 59 void arch_unregister_hw_breakpoint(struct perf_event *bp);
 60 void hw_breakpoint_pmu_read(struct perf_event *bp);
 61 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
 62 
 63 extern struct pmu perf_ops_bp;
 64 extern void ptrace_triggered(struct perf_event *bp,
 65                         struct perf_sample_data *data, struct pt_regs *regs);
 66 static inline void hw_breakpoint_disable(void)
 67 {
 68         struct arch_hw_breakpoint brk;
 69 
 70         brk.address = 0;
 71         brk.type = 0;
 72         brk.len = 0;
 73         if (ppc_breakpoint_available())
 74                 __set_breakpoint(&brk);
 75 }
 76 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
 77 int hw_breakpoint_handler(struct die_args *args);
 78 
 79 extern int set_dawr(struct arch_hw_breakpoint *brk);
 80 extern bool dawr_force_enable;
 81 static inline bool dawr_enabled(void)
 82 {
 83         return dawr_force_enable;
 84 }
 85 
 86 #else   /* CONFIG_HAVE_HW_BREAKPOINT */
 87 static inline void hw_breakpoint_disable(void) { }
 88 static inline void thread_change_pc(struct task_struct *tsk,
 89                                         struct pt_regs *regs) { }
 90 static inline bool dawr_enabled(void) { return false; }
 91 #endif  /* CONFIG_HAVE_HW_BREAKPOINT */
 92 #endif  /* __KERNEL__ */
 93 #endif  /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */
 94 

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