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 #ifdef CONFIG_PPC_8xx 38 #define HW_BREAKPOINT_ALIGN 0x3 39 #else 40 #define HW_BREAKPOINT_ALIGN 0x7 41 #endif 42 43 #define DABR_MAX_LEN 8 44 #define DAWR_MAX_LEN 512 45 46 #ifdef CONFIG_HAVE_HW_BREAKPOINT 47 #include <linux/kdebug.h> 48 #include <asm/reg.h> 49 #include <asm/debug.h> 50 51 struct perf_event_attr; 52 struct perf_event; 53 struct pmu; 54 struct perf_sample_data; 55 struct task_struct; 56 57 extern int hw_breakpoint_slots(int type); 58 extern int arch_bp_generic_fields(int type, int *gen_bp_type); 59 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw); 60 extern int hw_breakpoint_arch_parse(struct perf_event *bp, 61 const struct perf_event_attr *attr, 62 struct arch_hw_breakpoint *hw); 63 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, 64 unsigned long val, void *data); 65 int arch_install_hw_breakpoint(struct perf_event *bp); 66 void arch_uninstall_hw_breakpoint(struct perf_event *bp); 67 void arch_unregister_hw_breakpoint(struct perf_event *bp); 68 void hw_breakpoint_pmu_read(struct perf_event *bp); 69 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); 70 71 extern struct pmu perf_ops_bp; 72 extern void ptrace_triggered(struct perf_event *bp, 73 struct perf_sample_data *data, struct pt_regs *regs); 74 static inline void hw_breakpoint_disable(void) 75 { 76 struct arch_hw_breakpoint brk; 77 78 brk.address = 0; 79 brk.type = 0; 80 brk.len = 0; 81 brk.hw_len = 0; 82 if (ppc_breakpoint_available()) 83 __set_breakpoint(&brk); 84 } 85 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs); 86 int hw_breakpoint_handler(struct die_args *args); 87 88 #else /* CONFIG_HAVE_HW_BREAKPOINT */ 89 static inline void hw_breakpoint_disable(void) { } 90 static inline void thread_change_pc(struct task_struct *tsk, 91 struct pt_regs *regs) { } 92 93 #endif /* CONFIG_HAVE_HW_BREAKPOINT */ 94 95 96 #ifdef CONFIG_PPC_DAWR 97 extern bool dawr_force_enable; 98 static inline bool dawr_enabled(void) 99 { 100 return dawr_force_enable; 101 } 102 int set_dawr(struct arch_hw_breakpoint *brk); 103 #else 104 static inline bool dawr_enabled(void) { return false; } 105 static inline int set_dawr(struct arch_hw_breakpoint *brk) { return -1; } 106 #endif 107 108 #endif /* __KERNEL__ */ 109 #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ 110