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 /* Minimum granularity */ 38 #ifdef CONFIG_PPC_8xx 39 #define HW_BREAKPOINT_SIZE 0x4 40 #else 41 #define HW_BREAKPOINT_SIZE 0x8 42 #endif 43 44 #define DABR_MAX_LEN 8 45 #define DAWR_MAX_LEN 512 46 47 static inline int nr_wp_slots(void) 48 { 49 return HBP_NUM_MAX; 50 } 51 52 #ifdef CONFIG_HAVE_HW_BREAKPOINT 53 #include <linux/kdebug.h> 54 #include <asm/reg.h> 55 #include <asm/debug.h> 56 57 struct perf_event_attr; 58 struct perf_event; 59 struct pmu; 60 struct perf_sample_data; 61 struct task_struct; 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 hw_breakpoint_pmu_read(struct perf_event *bp); 74 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); 75 76 extern struct pmu perf_ops_bp; 77 extern void ptrace_triggered(struct perf_event *bp, 78 struct perf_sample_data *data, struct pt_regs *regs); 79 static inline void hw_breakpoint_disable(void) 80 { 81 int i; 82 struct arch_hw_breakpoint null_brk = {0}; 83 84 if (!ppc_breakpoint_available()) 85 return; 86 87 for (i = 0; i < nr_wp_slots(); i++) 88 __set_breakpoint(i, &null_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 #else /* CONFIG_HAVE_HW_BREAKPOINT */ 94 static inline void hw_breakpoint_disable(void) { } 95 static inline void thread_change_pc(struct task_struct *tsk, 96 struct pt_regs *regs) { } 97 98 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 99 100 101 #ifdef CONFIG_PPC_DAWR 102 extern bool dawr_force_enable; 103 static inline bool dawr_enabled(void) 104 { 105 return dawr_force_enable; 106 } 107 int set_dawr(int nr, struct arch_hw_breakpoint *brk); 108 #else 109 static inline bool dawr_enabled(void) { return false; } 110 static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; } 111 #endif 112 113 #endif /* __KERNEL__ */ 114 #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ 115