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| 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 | bool perf_single_step; /* temporarily uninstalled for a perf single step */ |
| 22 | }; |
| 23 | |
| 24 | /* Note: Don't change the first 6 bits below as they are in the same order |
| 25 | * as the dabr and dabrx. |
| 26 | */ |
| 27 | #define HW_BRK_TYPE_READ 0x01 |
| 28 | #define HW_BRK_TYPE_WRITE 0x02 |
| 29 | #define HW_BRK_TYPE_TRANSLATE 0x04 |
| 30 | #define HW_BRK_TYPE_USER 0x08 |
| 31 | #define HW_BRK_TYPE_KERNEL 0x10 |
| 32 | #define HW_BRK_TYPE_HYP 0x20 |
| 33 | #define HW_BRK_TYPE_EXTRANEOUS_IRQ 0x80 |
| 34 | |
| 35 | /* bits that overlap with the bottom 3 bits of the dabr */ |
| 36 | #define HW_BRK_TYPE_RDWR (HW_BRK_TYPE_READ | HW_BRK_TYPE_WRITE) |
| 37 | #define HW_BRK_TYPE_DABR (HW_BRK_TYPE_RDWR | HW_BRK_TYPE_TRANSLATE) |
| 38 | #define HW_BRK_TYPE_PRIV_ALL (HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \ |
| 39 | HW_BRK_TYPE_HYP) |
| 40 | |
| 41 | #define HW_BRK_FLAG_DISABLED 0x1 |
| 42 | |
| 43 | /* Minimum granularity */ |
| 44 | #ifdef CONFIG_PPC_8xx |
| 45 | #define HW_BREAKPOINT_SIZE 0x4 |
| 46 | #else |
| 47 | #define HW_BREAKPOINT_SIZE 0x8 |
| 48 | #endif |
| 49 | #define HW_BREAKPOINT_SIZE_QUADWORD 0x10 |
| 50 | |
| 51 | #define DABR_MAX_LEN 8 |
| 52 | #define DAWR_MAX_LEN 512 |
| 53 | |
| 54 | static inline int nr_wp_slots(void) |
| 55 | { |
| 56 | return cpu_has_feature(CPU_FTR_DAWR1) ? 2 : 1; |
| 57 | } |
| 58 | |
| 59 | bool wp_check_constraints(struct pt_regs *regs, ppc_inst_t instr, |
| 60 | unsigned long ea, int type, int size, |
| 61 | struct arch_hw_breakpoint *info); |
| 62 | |
| 63 | void wp_get_instr_detail(struct pt_regs *regs, ppc_inst_t *instr, |
| 64 | int *type, int *size, unsigned long *ea); |
| 65 | |
| 66 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 67 | #include <linux/kdebug.h> |
| 68 | #include <asm/reg.h> |
| 69 | #include <asm/debug.h> |
| 70 | |
| 71 | struct perf_event_attr; |
| 72 | struct perf_event; |
| 73 | struct pmu; |
| 74 | struct perf_sample_data; |
| 75 | struct task_struct; |
| 76 | |
| 77 | extern int hw_breakpoint_slots(int type); |
| 78 | extern int arch_bp_generic_fields(int type, int *gen_bp_type); |
| 79 | extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw); |
| 80 | extern int hw_breakpoint_arch_parse(struct perf_event *bp, |
| 81 | const struct perf_event_attr *attr, |
| 82 | struct arch_hw_breakpoint *hw); |
| 83 | extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, |
| 84 | unsigned long val, void *data); |
| 85 | int arch_install_hw_breakpoint(struct perf_event *bp); |
| 86 | void arch_uninstall_hw_breakpoint(struct perf_event *bp); |
| 87 | void hw_breakpoint_pmu_read(struct perf_event *bp); |
| 88 | extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); |
| 89 | |
| 90 | extern struct pmu perf_ops_bp; |
| 91 | extern void ptrace_triggered(struct perf_event *bp, |
| 92 | struct perf_sample_data *data, struct pt_regs *regs); |
| 93 | static inline void hw_breakpoint_disable(void) |
| 94 | { |
| 95 | int i; |
| 96 | struct arch_hw_breakpoint null_brk = {0}; |
| 97 | |
| 98 | if (!ppc_breakpoint_available()) |
| 99 | return; |
| 100 | |
| 101 | for (i = 0; i < nr_wp_slots(); i++) |
| 102 | __set_breakpoint(i, &null_brk); |
| 103 | } |
| 104 | extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs); |
| 105 | int hw_breakpoint_handler(struct die_args *args); |
| 106 | |
| 107 | #else /* CONFIG_HAVE_HW_BREAKPOINT */ |
| 108 | static inline void hw_breakpoint_disable(void) { } |
| 109 | static inline void thread_change_pc(struct task_struct *tsk, |
| 110 | struct pt_regs *regs) { } |
| 111 | |
| 112 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
| 113 | |
| 114 | |
| 115 | #ifdef CONFIG_PPC_DAWR |
| 116 | extern bool dawr_force_enable; |
| 117 | static inline bool dawr_enabled(void) |
| 118 | { |
| 119 | return dawr_force_enable; |
| 120 | } |
| 121 | int set_dawr(int nr, struct arch_hw_breakpoint *brk); |
| 122 | #else |
| 123 | static inline bool dawr_enabled(void) { return false; } |
| 124 | static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; } |
| 125 | #endif |
| 126 | |
| 127 | #endif /* __KERNEL__ */ |
| 128 | #endif /* _PPC_BOOK3S_64_HW_BREAKPOINT_H */ |
| 129 |
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