cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hw_breakpoint.h (2112B)

      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 */
     14struct 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
     47static inline int hw_breakpoint_slots(int type)
     48{
     49	return HBP_NUM;
     50}
     51
     52struct perf_event_attr;
     53struct perf_event;
     54struct pmu;
     55
     56extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
     57extern int hw_breakpoint_arch_parse(struct perf_event *bp,
     58				    const struct perf_event_attr *attr,
     59				    struct arch_hw_breakpoint *hw);
     60extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
     61					   unsigned long val, void *data);
     62
     63
     64int arch_install_hw_breakpoint(struct perf_event *bp);
     65void arch_uninstall_hw_breakpoint(struct perf_event *bp);
     66void hw_breakpoint_pmu_read(struct perf_event *bp);
     67void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
     68
     69extern void
     70arch_fill_perf_breakpoint(struct perf_event *bp);
     71
     72unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
     73int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
     74
     75extern int arch_bp_generic_fields(int x86_len, int x86_type,
     76				  int *gen_len, int *gen_type);
     77
     78extern struct pmu perf_ops_bp;
     79
     80#endif	/* _I386_HW_BREAKPOINT_H */