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
30static inline void arch_kgdb_breakpoint(void)
31{
32	asm ("brk %0" : : "I" (KGDB_COMPILED_DBG_BRK_IMM));
33}
34
35extern void kgdb_handle_bus_error(void);
36extern 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