linux/arch/x86/include/asm/hw_breakpoint.h
Frederic Weisbecker f7809daf64 x86: Support for instruction breakpoints
Instruction breakpoints need to have a specific length of 0 to
be working. Bring this support but also take care the user is not
trying to set an unsupported length, like a range breakpoint for
example.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Jason Wessel <jason.wessel@windriver.com>
2010-06-24 23:35:27 +02:00

77 lines
1.9 KiB
C

#ifndef _I386_HW_BREAKPOINT_H
#define _I386_HW_BREAKPOINT_H
#ifdef __KERNEL__
#define __ARCH_HW_BREAKPOINT_H
/*
* The name should probably be something dealt in
* a higher level. While dealing with the user
* (display/resolving)
*/
struct arch_hw_breakpoint {
unsigned long address;
u8 len;
u8 type;
};
#include <linux/kdebug.h>
#include <linux/percpu.h>
#include <linux/list.h>
/* Available HW breakpoint length encodings */
#define X86_BREAKPOINT_LEN_X 0x00
#define X86_BREAKPOINT_LEN_1 0x40
#define X86_BREAKPOINT_LEN_2 0x44
#define X86_BREAKPOINT_LEN_4 0x4c
#ifdef CONFIG_X86_64
#define X86_BREAKPOINT_LEN_8 0x48
#endif
/* Available HW breakpoint type encodings */
/* trigger on instruction execute */
#define X86_BREAKPOINT_EXECUTE 0x80
/* trigger on memory write */
#define X86_BREAKPOINT_WRITE 0x81
/* trigger on memory read or write */
#define X86_BREAKPOINT_RW 0x83
/* Total number of available HW breakpoint registers */
#define HBP_NUM 4
static inline int hw_breakpoint_slots(int type)
{
return HBP_NUM;
}
struct perf_event;
struct pmu;
extern int arch_check_bp_in_kernelspace(struct perf_event *bp);
extern int arch_validate_hwbkpt_settings(struct perf_event *bp);
extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
unsigned long val, void *data);
int arch_install_hw_breakpoint(struct perf_event *bp);
void arch_uninstall_hw_breakpoint(struct perf_event *bp);
void hw_breakpoint_pmu_read(struct perf_event *bp);
void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
extern void
arch_fill_perf_breakpoint(struct perf_event *bp);
unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
extern int arch_bp_generic_fields(int x86_len, int x86_type,
int *gen_len, int *gen_type);
extern struct pmu perf_ops_bp;
#endif /* __KERNEL__ */
#endif /* _I386_HW_BREAKPOINT_H */