| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _I386_HW_BREAKPOINT_H |
| 3 | #define _I386_HW_BREAKPOINT_H |
| 4 | |
| 5 | #include <uapi/asm/hw_breakpoint.h> |
| 6 | |
| 7 | #define __ARCH_HW_BREAKPOINT_H |
| 8 | |
| 9 | /* |
| 10 | * The name should probably be something dealt in |
| 11 | * a higher level. While dealing with the user |
| 12 | * (display/resolving) |
| 13 | */ |
| 14 | struct arch_hw_breakpoint { |
| 15 | unsigned long address; |
| 16 | unsigned long mask; |
| 17 | u8 len; |
| 18 | u8 type; |
| 19 | }; |
| 20 | |
| 21 | #include <linux/kdebug.h> |
| 22 | #include <linux/percpu.h> |
| 23 | #include <linux/list.h> |
| 24 | |
| 25 | /* Available HW breakpoint length encodings */ |
| 26 | #define X86_BREAKPOINT_LEN_X 0x40 |
| 27 | #define X86_BREAKPOINT_LEN_1 0x40 |
| 28 | #define X86_BREAKPOINT_LEN_2 0x44 |
| 29 | #define X86_BREAKPOINT_LEN_4 0x4c |
| 30 | |
| 31 | #ifdef CONFIG_X86_64 |
| 32 | #define X86_BREAKPOINT_LEN_8 0x48 |
| 33 | #endif |
| 34 | |
| 35 | /* Available HW breakpoint type encodings */ |
| 36 | |
| 37 | /* trigger on instruction execute */ |
| 38 | #define X86_BREAKPOINT_EXECUTE 0x80 |
| 39 | /* trigger on memory write */ |
| 40 | #define X86_BREAKPOINT_WRITE 0x81 |
| 41 | /* trigger on memory read or write */ |
| 42 | #define X86_BREAKPOINT_RW 0x83 |
| 43 | |
| 44 | /* Total number of available HW breakpoint registers */ |
| 45 | #define HBP_NUM 4 |
| 46 | |
| 47 | static inline int hw_breakpoint_slots(int type) |
| 48 | { |
| 49 | return HBP_NUM; |
| 50 | } |
| 51 | |
| 52 | struct perf_event_attr; |
| 53 | struct perf_event; |
| 54 | struct pmu; |
| 55 | |
| 56 | extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw); |
| 57 | extern int hw_breakpoint_arch_parse(struct perf_event *bp, |
| 58 | const struct perf_event_attr *attr, |
| 59 | struct arch_hw_breakpoint *hw); |
| 60 | extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused, |
| 61 | unsigned long val, void *data); |
| 62 | |
| 63 | |
| 64 | int arch_install_hw_breakpoint(struct perf_event *bp); |
| 65 | void arch_uninstall_hw_breakpoint(struct perf_event *bp); |
| 66 | void hw_breakpoint_pmu_read(struct perf_event *bp); |
| 67 | void hw_breakpoint_pmu_unthrottle(struct perf_event *bp); |
| 68 | |
| 69 | extern void |
| 70 | arch_fill_perf_breakpoint(struct perf_event *bp); |
| 71 | |
| 72 | unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type); |
| 73 | int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type); |
| 74 | |
| 75 | extern int arch_bp_generic_fields(int x86_len, int x86_type, |
| 76 | int *gen_len, int *gen_type); |
| 77 | |
| 78 | extern struct pmu perf_ops_bp; |
| 79 | |
| 80 | #endif /* _I386_HW_BREAKPOINT_H */ |