Pileus Git - ~andy/linux/blob - arch/arm64/include/asm/debug-monitors.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_DEBUG_MONITORS_H
  17 #define __ASM_DEBUG_MONITORS_H
  18
  19 #ifdef __KERNEL__
  20
  21 #define DBG_ESR_EVT(x)          (((x) >> 27) & 0x7)
  22
  23 /* AArch64 */
  24 #define DBG_ESR_EVT_HWBP        0x0
  25 #define DBG_ESR_EVT_HWSS        0x1
  26 #define DBG_ESR_EVT_HWWP        0x2
  27 #define DBG_ESR_EVT_BRK         0x6
  28
  29 enum debug_el {
  30         DBG_ACTIVE_EL0 = 0,
  31         DBG_ACTIVE_EL1,
  32 };
  33
  34 /* AArch32 */
  35 #define DBG_ESR_EVT_BKPT        0x4
  36 #define DBG_ESR_EVT_VECC        0x5
  37
  38 #define AARCH32_BREAK_ARM       0x07f001f0
  39 #define AARCH32_BREAK_THUMB     0xde01
  40 #define AARCH32_BREAK_THUMB2_LO 0xf7f0
  41 #define AARCH32_BREAK_THUMB2_HI 0xa000
  42
  43 #ifndef __ASSEMBLY__
  44 struct task_struct;
  45
  46 #define local_dbg_save(flags)                                                   \
  47         do {                                                                    \
  48                 typecheck(unsigned long, flags);                                \
  49                 asm volatile(                                                   \
  50                 "mrs    %0, daif                        // local_dbg_save\n"    \
  51                 "msr    daifset, #8"                                            \
  52                 : "=r" (flags) : : "memory");                                   \
  53         } while (0)
  54
  55 #define local_dbg_restore(flags)                                                \
  56         do {                                                                    \
  57                 typecheck(unsigned long, flags);                                \
  58                 asm volatile(                                                   \
  59                 "msr    daif, %0                        // local_dbg_restore\n" \
  60                 : : "r" (flags) : "memory");                                    \
  61         } while (0)
  62
  63 #define DBG_ARCH_ID_RESERVED    0       /* In case of ptrace ABI updates. */
  64
  65 #define DBG_HOOK_HANDLED        0
  66 #define DBG_HOOK_ERROR          1
  67
  68 struct step_hook {
  69         struct list_head node;
  70         int (*fn)(struct pt_regs *regs, unsigned int esr);
  71 };
  72
  73 void register_step_hook(struct step_hook *hook);
  74 void unregister_step_hook(struct step_hook *hook);
  75
  76 struct break_hook {
  77         struct list_head node;
  78         u32 esr_val;
  79         u32 esr_mask;
  80         int (*fn)(struct pt_regs *regs, unsigned int esr);
  81 };
  82
  83 void register_break_hook(struct break_hook *hook);
  84 void unregister_break_hook(struct break_hook *hook);
  85
  86 u8 debug_monitors_arch(void);
  87
  88 void enable_debug_monitors(enum debug_el el);
  89 void disable_debug_monitors(enum debug_el el);
  90
  91 void user_rewind_single_step(struct task_struct *task);
  92 void user_fastforward_single_step(struct task_struct *task);
  93
  94 void kernel_enable_single_step(struct pt_regs *regs);
  95 void kernel_disable_single_step(void);
  96 int kernel_active_single_step(void);
  97
  98 #ifdef CONFIG_HAVE_HW_BREAKPOINT
  99 int reinstall_suspended_bps(struct pt_regs *regs);
 100 #else
 101 static inline int reinstall_suspended_bps(struct pt_regs *regs)
 102 {
 103         return -ENODEV;
 104 }
 105 #endif
 106
 107 int aarch32_break_handler(struct pt_regs *regs);
 108
 109 #endif  /* __ASSEMBLY */
 110 #endif  /* __KERNEL__ */
 111 #endif  /* __ASM_DEBUG_MONITORS_H */