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" (KGDB_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 */ 85