debug-monitors.h

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/*
 * 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. */

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

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