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 u8 flags; 21 }; 22 23 /* Note: Don't change the first 6 bits below as they are in the same order 24 * as the dabr and dabrx. 25 */ 26 #define HW_BRK_TYPE_READ 0x01 27 #define HW_BRK_TYPE_WRITE 0x02 28 #define HW_BRK_TYPE_TRANSLATE 0x04 29 #define HW_BRK_TYPE_USER 0x08 30 #define HW_BRK_TYPE_KERNEL 0x10 31 #define HW_BRK_TYPE_HYP 0x20 32 #define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80 33 34 /* bits that overlap with the bottom 3 bits of the dabr */ 35 #define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE) 36 #define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE) 37 #define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \ 38 HW_BRK_TYPE_HYP) 39 40 #define HW_BRK_FLAG_DISABLED 0x1 41 42 /* Minimum granularity */ 43 #ifdef CONFIG_PPC_8xx 44 #define HW_BREAKPOINT_SIZE 0x4 45 #else 46 #define HW_BREAKPOINT_SIZE 0x8 47 #endif 48 #define HW_BREAKPOINT_SIZE_QUADWORD 0x10 49 50 #define DABR_MAX_LEN 8 51 #define DAWR_MAX_LEN 512 52 53 static inline int nr_wp_slots(void) 54 { 55 return cpu_has_feature(CPU_FTR_DAWR1) ? 2 : 1; 56 } 57 58 bool wp_check_constraints(struct pt_regs *regs, ppc_inst_t instr, 59 unsigned long ea, int type, int size, 60 struct arch_hw_breakpoint *info); 61 62 void wp_get_instr_detail(struct pt_regs *regs, ppc_inst_t *instr, 63 int *type, int *size, unsigned long *ea); 64 65 #ifdef CONFIG_HAVE_HW_BREAKPOINT 66 #include <linux/kdebug.h> 67 #include <asm/reg.h> 68 #include <asm/debug.h> 69 70 struct perf_event_attr; 71 struct perf_event; 72 struct pmu; 73 struct perf_sample_data; 74 struct task_struct; 75 76 extern int hw_breakpoint_slots(int type); 77 extern int arch_bp_generic_fields(int type, int *gen_bp_type); 78 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw); 79 extern int hw_breakpoint_arch_parse(struct perf_event *bp, 80 const struct perf_event_attr *attr, 81 struct arch_hw_breakpoint *hw); 82 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, 83 unsigned long val, void *data); 84 int arch_install_hw_breakpoint(struct perf_event *bp); 85 void arch_uninstall_hw_breakpoint(struct perf_event *bp); 86 void hw_breakpoint_pmu_read(struct perf_event *bp); 87 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); 88 89 extern struct pmu perf_ops_bp; 90 extern void ptrace_triggered(struct perf_event *bp, 91 struct perf_sample_data *data, struct pt_regs *regs); 92 static inline void hw_breakpoint_disable(void) 93 { 94 int i; 95 struct arch_hw_breakpoint null_brk = {0}; 96 97 if (!ppc_breakpoint_available()) 98 return; 99 100 for (i = 0; i < nr_wp_slots(); i++) 101 __set_breakpoint(i, &null_brk); 102 } 103 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs); 104 int hw_breakpoint_handler(struct die_args *args); 105 106 #else /* CONFIG_HAVE_HW_BREAKPOINT */ 107 static inline void hw_breakpoint_disable(void) { } 108 static inline void thread_change_pc(struct task_struct *tsk, 109 struct pt_regs *regs) { } 110 111 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 112 113 114 #ifdef CONFIG_PPC_DAWR 115 extern bool dawr_force_enable; 116 static inline bool dawr_enabled(void) 117 { 118 return dawr_force_enable; 119 } 120 int set_dawr(int nr, struct arch_hw_breakpoint *brk); 121 #else 122 static inline bool dawr_enabled(void) { return false; } 123 static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; } 124 #endif 125 126 #endif /* __KERNEL__ */ 127 #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ 128