include/asm/hw_breakpoint.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _I386_HW_BREAKPOINT_H
0003 #define _I386_HW_BREAKPOINT_H
0004
0005 #include <uapi/asm/hw_breakpoint.h>
0006
0007 #define __ARCH_HW_BREAKPOINT_H
0008
0009 /*
0010  * The name should probably be something dealt in
0011  * a higher level. While dealing with the user
0012  * (display/resolving)
0013  */
0014 struct arch_hw_breakpoint {
0015     unsigned long   address;
0016     unsigned long   mask;
0017     u8      len;
0018     u8      type;
0019 };
0020
0021 #include <linux/kdebug.h>
0022 #include <linux/percpu.h>
0023 #include <linux/list.h>
0024
0025 /* Available HW breakpoint length encodings */
0026 #define X86_BREAKPOINT_LEN_X        0x40
0027 #define X86_BREAKPOINT_LEN_1        0x40
0028 #define X86_BREAKPOINT_LEN_2        0x44
0029 #define X86_BREAKPOINT_LEN_4        0x4c
0030
0031 #ifdef CONFIG_X86_64
0032 #define X86_BREAKPOINT_LEN_8        0x48
0033 #endif
0034
0035 /* Available HW breakpoint type encodings */
0036
0037 /* trigger on instruction execute */
0038 #define X86_BREAKPOINT_EXECUTE  0x80
0039 /* trigger on memory write */
0040 #define X86_BREAKPOINT_WRITE    0x81
0041 /* trigger on memory read or write */
0042 #define X86_BREAKPOINT_RW   0x83
0043
0044 /* Total number of available HW breakpoint registers */
0045 #define HBP_NUM 4
0046
0047 static inline int hw_breakpoint_slots(int type)
0048 {
0049     return HBP_NUM;
0050 }
0051
0052 struct perf_event_attr;
0053 struct perf_event;
0054 struct pmu;
0055
0056 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
0057 extern int hw_breakpoint_arch_parse(struct perf_event *bp,
0058                     const struct perf_event_attr *attr,
0059                     struct arch_hw_breakpoint *hw);
0060 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
0061                        unsigned long val, void *data);
0062
0063
0064 int arch_install_hw_breakpoint(struct perf_event *bp);
0065 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
0066 void hw_breakpoint_pmu_read(struct perf_event *bp);
0067 void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
0068
0069 extern void
0070 arch_fill_perf_breakpoint(struct perf_event *bp);
0071
0072 unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
0073 int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
0074
0075 extern int arch_bp_generic_fields(int x86_len, int x86_type,
0076                   int *gen_len, int *gen_type);
0077
0078 extern struct pmu perf_ops_bp;
0079
0080 #endif  /* _I386_HW_BREAKPOINT_H */