arch/arm64/include/asm/debug-monitors.h

/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_DEBUG_MONITORS_H
#define __ASM_DEBUG_MONITORS_H

#ifdef __KERNEL__

#define	DBG_ESR_EVT(x)		(((x) >> 27) & 0x7)

/* AArch64 */
#define DBG_ESR_EVT_HWBP	0x0
#define DBG_ESR_EVT_HWSS	0x1
#define DBG_ESR_EVT_HWWP	0x2
#define DBG_ESR_EVT_BRK		0x6

enum debug_el {
	DBG_ACTIVE_EL0 = 0,
	DBG_ACTIVE_EL1,
};

/* AArch32 */
#define DBG_ESR_EVT_BKPT	0x4
#define DBG_ESR_EVT_VECC	0x5

#define AARCH32_BREAK_ARM	0x07f001f0
#define AARCH32_BREAK_THUMB	0xde01
#define AARCH32_BREAK_THUMB2_LO	0xf7f0
#define AARCH32_BREAK_THUMB2_HI	0xa000

#ifndef __ASSEMBLY__
struct task_struct;

#define local_dbg_save(flags)							\
	do {									\
		typecheck(unsigned long, flags);				\
		asm volatile(							\
		"mrs	%0, daif			// local_dbg_save\n"	\
		"msr	daifset, #8"						\
		: "=r" (flags) : : "memory");					\
	} while (0)

#define local_dbg_restore(flags)						\
	do {									\
		typecheck(unsigned long, flags);				\
		asm volatile(							\
		"msr	daif, %0			// local_dbg_restore\n"	\
		: : "r" (flags) : "memory");					\
	} while (0)

#define DBG_ARCH_ID_RESERVED	0	/* In case of ptrace ABI updates. */

#define DBG_HOOK_HANDLED	0
#define DBG_HOOK_ERROR		1

struct step_hook {
	struct list_head node;
	int (*fn)(struct pt_regs *regs, unsigned int esr);
};

void register_step_hook(struct step_hook *hook);
void unregister_step_hook(struct step_hook *hook);

struct break_hook {
	struct list_head node;
	u32 esr_val;
	u32 esr_mask;
	int (*fn)(struct pt_regs *regs, unsigned int esr);
};

void register_break_hook(struct break_hook *hook);
void unregister_break_hook(struct break_hook *hook);

u8 debug_monitors_arch(void);

void enable_debug_monitors(enum debug_el el);
void disable_debug_monitors(enum debug_el el);

void user_rewind_single_step(struct task_struct *task);
void user_fastforward_single_step(struct task_struct *task);

void kernel_enable_single_step(struct pt_regs *regs);
void kernel_disable_single_step(void);
int kernel_active_single_step(void);

#ifdef CONFIG_HAVE_HW_BREAKPOINT
int reinstall_suspended_bps(struct pt_regs *regs);
#else
static inline int reinstall_suspended_bps(struct pt_regs *regs)
{
	return -ENODEV;
}
#endif

int aarch32_break_handler(struct pt_regs *regs);

#endif	/* __ASSEMBLY */
#endif	/* __KERNEL__ */
#endif	/* __ASM_DEBUG_MONITORS_H */