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 u16 hw_len; /* length programmed in hw */ 18 }; 19 20 /* Note: Don't change the the first 6 bits below as they are in the same order 21 * as the dabr and dabrx. 22 */ 23 #define HW_BRK_TYPE_READ 0x01 24 #define HW_BRK_TYPE_WRITE 0x02 25 #define HW_BRK_TYPE_TRANSLATE 0x04 26 #define HW_BRK_TYPE_USER 0x08 27 #define HW_BRK_TYPE_KERNEL 0x10 28 #define HW_BRK_TYPE_HYP 0x20 29 #define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80 30 31 /* bits that overlap with the bottom 3 bits of the dabr */ 32 #define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE) 33 #define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE) 34 #define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \ 35 HW_BRK_TYPE_HYP) 36 37 #define HW_BREAKPOINT_ALIGN 0x7 38 39 #define DABR_MAX_LEN 8 40 #define DAWR_MAX_LEN 512 41 42 #ifdef CONFIG_HAVE_HW_BREAKPOINT 43 #include <linux/kdebug.h> 44 #include <asm/reg.h> 45 #include <asm/debug.h> 46 47 struct perf_event_attr; 48 struct perf_event; 49 struct pmu; 50 struct perf_sample_data; 51 struct task_struct; 52 53 extern int hw_breakpoint_slots(int type); 54 extern int arch_bp_generic_fields(int type, int *gen_bp_type); 55 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw); 56 extern int hw_breakpoint_arch_parse(struct perf_event *bp, 57 const struct perf_event_attr *attr, 58 struct arch_hw_breakpoint *hw); 59 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, 60 unsigned long val, void *data); 61 int arch_install_hw_breakpoint(struct perf_event *bp); 62 void arch_uninstall_hw_breakpoint(struct perf_event *bp); 63 void arch_unregister_hw_breakpoint(struct perf_event *bp); 64 void hw_breakpoint_pmu_read(struct perf_event *bp); 65 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); 66 67 extern struct pmu perf_ops_bp; 68 extern void ptrace_triggered(struct perf_event *bp, 69 struct perf_sample_data *data, struct pt_regs *regs); 70 static inline void hw_breakpoint_disable(void) 71 { 72 struct arch_hw_breakpoint brk; 73 74 brk.address = 0; 75 brk.type = 0; 76 brk.len = 0; 77 brk.hw_len = 0; 78 if (ppc_breakpoint_available()) 79 __set_breakpoint(&brk); 80 } 81 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs); 82 int hw_breakpoint_handler(struct die_args *args); 83 84 #else /* CONFIG_HAVE_HW_BREAKPOINT */ 85 static inline void hw_breakpoint_disable(void) { } 86 static inline void thread_change_pc(struct task_struct *tsk, 87 struct pt_regs *regs) { } 88 89 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 90 91 92 #ifdef CONFIG_PPC_DAWR 93 extern bool dawr_force_enable; 94 static inline bool dawr_enabled(void) 95 { 96 return dawr_force_enable; 97 } 98 int set_dawr(struct arch_hw_breakpoint *brk); 99 #else 100 static inline bool dawr_enabled(void) { return false; } 101 static inline int set_dawr(struct arch_hw_breakpoint *brk) { return -1; } 102 #endif 103 104 #endif /* __KERNEL__ */ 105 #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ 106