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 */ 81