arch/arm64/include/asm/kgdb.h

   1 /*
   2  * AArch64 KGDB support
   3  *
   4  * Based on arch/arm/include/kgdb.h
   5  *
   6  * Copyright (C) 2013 Cavium Inc.
   7  * Author: Vijaya Kumar K <vijaya.kumar@caviumnetworks.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef __ARM_KGDB_H
  23 #define __ARM_KGDB_H
  24
  25 #include <linux/ptrace.h>
  26 #include <asm/debug-monitors.h>
  27
  28 #ifndef __ASSEMBLY__
  29
  30 static inline void arch_kgdb_breakpoint(void)
  31 {
  32         asm ("brk %0" : : "I" (KDBG_COMPILED_DBG_BRK_IMM));
  33 }
  34
  35 extern void kgdb_handle_bus_error(void);
  36 extern int kgdb_fault_expected;
  37
  38 #endif /* !__ASSEMBLY__ */
  39
  40 /*
  41  * gdb is expecting the following registers layout.
  42  *
  43  * General purpose regs:
  44  *     r0-r30: 64 bit
  45  *     sp,pc : 64 bit
  46  *     pstate  : 64 bit
  47  *     Total: 34
  48  * FPU regs:
  49  *     f0-f31: 128 bit
  50  *     Total: 32
  51  * Extra regs
  52  *     fpsr & fpcr: 32 bit
  53  *     Total: 2
  54  *
  55  */
  56
  57 #define _GP_REGS                34
  58 #define _FP_REGS                32
  59 #define _EXTRA_REGS             2
  60 /*
  61  * general purpose registers size in bytes.
  62  * pstate is only 4 bytes. subtract 4 bytes
  63  */
  64 #define GP_REG_BYTES            (_GP_REGS * 8)
  65 #define DBG_MAX_REG_NUM         (_GP_REGS + _FP_REGS + _EXTRA_REGS)
  66
  67 /*
  68  * Size of I/O buffer for gdb packet.
  69  * considering to hold all register contents, size is set
  70  */
  71
  72 #define BUFMAX                  2048
  73
  74 /*
  75  * Number of bytes required for gdb_regs buffer.
  76  * _GP_REGS: 8 bytes, _FP_REGS: 16 bytes and _EXTRA_REGS: 4 bytes each
  77  * GDB fails to connect for size beyond this with error
  78  * "'g' packet reply is too long"
  79  */
  80
  81 #define NUMREGBYTES     ((_GP_REGS * 8) + (_FP_REGS * 16) + \
  82                         (_EXTRA_REGS * 4))
  83
  84 #endif /* __ASM_KGDB_H */