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9842ceae9f
This patch adds support for uprobe on ARM64 architecture.
Unit tests for following have been done so far and they have been found
working
1. Step-able instructions, like sub, ldr, add etc.
2. Simulation-able like ret, cbnz, cbz etc.
3. uretprobe
4. Reject-able instructions like sev, wfe etc.
5. trapped and abort xol path
6. probe at unaligned user address.
7. longjump test cases
Currently it does not support aarch32 instruction probing.
Signed-off-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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#ifdef __KERNEL__
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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_ESR_MASK 0xFFFF
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#define BRK64_ESR_KPROBES 0x0004
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#define BRK64_OPCODE_KPROBES (AARCH64_BREAK_MON | (BRK64_ESR_KPROBES << 5))
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/* uprobes BRK opcodes with ESR encoding */
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#define BRK64_ESR_UPROBES 0x0005
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#define BRK64_OPCODE_UPROBES (AARCH64_BREAK_MON | (BRK64_ESR_UPROBES << 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_step_hook(struct step_hook *hook);
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void unregister_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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u32 esr_val;
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u32 esr_mask;
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int (*fn)(struct pt_regs *regs, unsigned int esr);
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};
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void register_break_hook(struct break_hook *hook);
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void unregister_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 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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#endif /* __ASSEMBLY */
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#endif /* __KERNEL__ */
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#endif /* __ASM_DEBUG_MONITORS_H */
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