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 #include <asm/cpu_has_feature.h> 13 14 #ifdef __KERNEL__ 15 struct arch_hw_breakpoint { 16 unsigned long address; 17 u16 type; 18 u16 len; /* length of the target data symbol */ 19 u16 hw_len; /* length programmed in hw */ 20 }; 21 22 /* Note: Don't change the first 6 bits below as they are in the same order 23 * as the dabr and dabrx. 24 */ 25 #define HW_BRK_TYPE_READ 0x01 26 #define HW_BRK_TYPE_WRITE 0x02 27 #define HW_BRK_TYPE_TRANSLATE 0x04 28 #define HW_BRK_TYPE_USER 0x08 29 #define HW_BRK_TYPE_KERNEL 0x10 30 #define HW_BRK_TYPE_HYP 0x20 31 #define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80 32 33 /* bits that overlap with the bottom 3 bits of the dabr */ 34 #define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE) 35 #define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE) 36 #define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \ 37 HW_BRK_TYPE_HYP) 38 39 /* Minimum granularity */ 40 #ifdef CONFIG_PPC_8xx 41 #define HW_BREAKPOINT_SIZE 0x4 42 #else 43 #define HW_BREAKPOINT_SIZE 0x8 44 #endif 45 46 #define DABR_MAX_LEN 8 47 #define DAWR_MAX_LEN 512 48 49 static inline int nr_wp_slots(void) 50 { 51 return cpu_has_feature(CPU_FTR_DAWR1) ? 2 : 1; 52 } 53 54 #ifdef CONFIG_HAVE_HW_BREAKPOINT 55 #include <linux/kdebug.h> 56 #include <asm/reg.h> 57 #include <asm/debug.h> 58 59 struct perf_event_attr; 60 struct perf_event; 61 struct pmu; 62 struct perf_sample_data; 63 struct task_struct; 64 65 extern int hw_breakpoint_slots(int type); 66 extern int arch_bp_generic_fields(int type, int *gen_bp_type); 67 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw); 68 extern int hw_breakpoint_arch_parse(struct perf_event *bp, 69 const struct perf_event_attr *attr, 70 struct arch_hw_breakpoint *hw); 71 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, 72 unsigned long val, void *data); 73 int arch_install_hw_breakpoint(struct perf_event *bp); 74 void arch_uninstall_hw_breakpoint(struct perf_event *bp); 75 void hw_breakpoint_pmu_read(struct perf_event *bp); 76 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); 77 78 extern struct pmu perf_ops_bp; 79 extern void ptrace_triggered(struct perf_event *bp, 80 struct perf_sample_data *data, struct pt_regs *regs); 81 static inline void hw_breakpoint_disable(void) 82 { 83 int i; 84 struct arch_hw_breakpoint null_brk = {0}; 85 86 if (!ppc_breakpoint_available()) 87 return; 88 89 for (i = 0; i < nr_wp_slots(); i++) 90 __set_breakpoint(i, &null_brk); 91 } 92 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs); 93 int hw_breakpoint_handler(struct die_args *args); 94 95 #else /* CONFIG_HAVE_HW_BREAKPOINT */ 96 static inline void hw_breakpoint_disable(void) { } 97 static inline void thread_change_pc(struct task_struct *tsk, 98 struct pt_regs *regs) { } 99 100 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 101 102 103 #ifdef CONFIG_PPC_DAWR 104 extern bool dawr_force_enable; 105 static inline bool dawr_enabled(void) 106 { 107 return dawr_force_enable; 108 } 109 int set_dawr(int nr, struct arch_hw_breakpoint *brk); 110 #else 111 static inline bool dawr_enabled(void) { return false; } 112 static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; } 113 #endif 114 115 #endif /* __KERNEL__ */ 116 #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ 117