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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/include/asm/debug-monitors.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * Copyright (C) 2012 ARM Ltd.

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 */

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#ifndef __ASM_DEBUG_MONITORS_H

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#define __ASM_DEBUG_MONITORS_H

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#include <linux/errno.h>

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#include <linux/types.h>

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#include <asm/brk-imm.h>

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#include <asm/esr.h>

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#include <asm/insn.h>

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#include <asm/ptrace.h>

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/* Low-level stepping controls. */

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#define DBG_SPSR_SS		(1 << 21)

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

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/* AArch64 */

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#define DBG_ESR_EVT_HWBP	0x0

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#define DBG_ESR_EVT_HWSS	0x1

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#define DBG_ESR_EVT_HWWP	0x2

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#define DBG_ESR_EVT_BRK		0x6

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/*

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 * Break point instruction encoding

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 */

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#define BREAK_INSTR_SIZE		AARCH64_INSN_SIZE

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#define AARCH64_BREAK_KGDB_DYN_DBG	\

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	(AARCH64_BREAK_MON | (KGDB_DYN_DBG_BRK_IMM << 5))

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#define CACHE_FLUSH_IS_SAFE		1

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/* kprobes BRK opcodes with ESR encoding  */

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#define BRK64_OPCODE_KPROBES	(AARCH64_BREAK_MON | (KPROBES_BRK_IMM << 5))

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#define BRK64_OPCODE_KPROBES_SS	(AARCH64_BREAK_MON | (KPROBES_BRK_SS_IMM << 5))

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/* uprobes BRK opcodes with ESR encoding  */

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#define BRK64_OPCODE_UPROBES	(AARCH64_BREAK_MON | (UPROBES_BRK_IMM << 5))

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/* AArch32 */

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#define DBG_ESR_EVT_BKPT	0x4

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#define DBG_ESR_EVT_VECC	0x5

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#define AARCH32_BREAK_ARM	0x07f001f0

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#define AARCH32_BREAK_THUMB	0xde01

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#define AARCH32_BREAK_THUMB2_LO	0xf7f0

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#define AARCH32_BREAK_THUMB2_HI	0xa000

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#ifndef __ASSEMBLY__

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struct task_struct;

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

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#define DBG_HOOK_HANDLED	0

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#define DBG_HOOK_ERROR		1

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u8 debug_monitors_arch(void);

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enum dbg_active_el {

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	DBG_ACTIVE_EL0 = 0,

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	DBG_ACTIVE_EL1,

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};

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void enable_debug_monitors(enum dbg_active_el el);

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void disable_debug_monitors(enum dbg_active_el el);

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void user_rewind_single_step(struct task_struct *task);

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void user_fastforward_single_step(struct task_struct *task);

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void user_regs_reset_single_step(struct user_pt_regs *regs,

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				 struct task_struct *task);

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void kernel_enable_single_step(struct pt_regs *regs);

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void kernel_disable_single_step(void);

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int kernel_active_single_step(void);

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void kernel_rewind_single_step(struct pt_regs *regs);

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void kernel_fastforward_single_step(struct pt_regs *regs);

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#ifdef CONFIG_HAVE_HW_BREAKPOINT

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bool try_step_suspended_breakpoints(struct pt_regs *regs);

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#else

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static inline bool try_step_suspended_breakpoints(struct pt_regs *regs)

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{

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	return false;

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}

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#endif

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bool try_handle_aarch32_break(struct pt_regs *regs);

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#endif	/* __ASSEMBLY */

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#endif	/* __ASM_DEBUG_MONITORS_H */

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