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7ee31a3aa8
Commit36dadef23f("kprobes: Init kprobes in early_initcall") enabled using kprobes from early_initcall. Unfortunately at this point the hardware debug infrastructure is not operational. The OS lock may still be locked, and the hardware watchpoints may have unknown values when kprobe enables debug monitors to single-step instructions. Rather than using hardware single-step, append a BRK instruction after the instruction to be executed out-of-line. Fixes:36dadef23f("kprobes: Init kprobes in early_initcall") Suggested-by: Will Deacon <will@kernel.org> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Link: https://lore.kernel.org/r/20201103134900.337243-1-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
135 lines
3.5 KiB
C
135 lines
3.5 KiB
C
/* 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_MDSCR_SS (1 << 0)
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#define DBG_SPSR_SS (1 << 21)
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/* MDSCR_EL1 enabling bits */
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#define DBG_MDSCR_KDE (1 << 13)
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#define DBG_MDSCR_MDE (1 << 15)
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#define DBG_MDSCR_MASK ~(DBG_MDSCR_KDE | DBG_MDSCR_MDE)
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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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/*
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* BRK instruction encoding
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* The #imm16 value should be placed at bits[20:5] within BRK ins
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*/
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#define AARCH64_BREAK_MON 0xd4200000
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/*
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* BRK instruction for provoking a fault on purpose
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* Unlike kgdb, #imm16 value with unallocated handler is used for faulting.
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*/
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#define AARCH64_BREAK_FAULT (AARCH64_BREAK_MON | (FAULT_BRK_IMM << 5))
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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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struct step_hook {
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struct list_head node;
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int (*fn)(struct pt_regs *regs, unsigned int esr);
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};
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void register_user_step_hook(struct step_hook *hook);
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void unregister_user_step_hook(struct step_hook *hook);
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void register_kernel_step_hook(struct step_hook *hook);
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void unregister_kernel_step_hook(struct step_hook *hook);
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struct break_hook {
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struct list_head node;
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int (*fn)(struct pt_regs *regs, unsigned int esr);
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u16 imm;
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u16 mask; /* These bits are ignored when comparing with imm */
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};
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void register_user_break_hook(struct break_hook *hook);
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void unregister_user_break_hook(struct break_hook *hook);
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void register_kernel_break_hook(struct break_hook *hook);
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void unregister_kernel_break_hook(struct break_hook *hook);
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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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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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int reinstall_suspended_bps(struct pt_regs *regs);
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#else
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static inline int reinstall_suspended_bps(struct pt_regs *regs)
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{
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return -ENODEV;
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}
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#endif
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int aarch32_break_handler(struct pt_regs *regs);
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void debug_traps_init(void);
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#endif /* __ASSEMBLY */
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#endif /* __ASM_DEBUG_MONITORS_H */
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