1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * kgdb support for ARC
4  *
5  * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
6  */
7 
8 #ifndef __ARC_KGDB_H__
9 #define __ARC_KGDB_H__
10 
11 #ifdef CONFIG_KGDB
12 
13 #include <asm/ptrace.h>
14 
15 /* to ensure compatibility with Linux 2.6.35, we don't implement the get/set
16  * register API yet */
17 #undef DBG_MAX_REG_NUM
18 
19 #define GDB_MAX_REGS		87
20 
21 #define BREAK_INSTR_SIZE	2
22 #define CACHE_FLUSH_IS_SAFE	1
23 #define NUMREGBYTES		(GDB_MAX_REGS * 4)
24 #define BUFMAX			2048
25 
arch_kgdb_breakpoint(void)26 static inline void arch_kgdb_breakpoint(void)
27 {
28 	__asm__ __volatile__ ("trap_s	0x4\n");
29 }
30 
31 extern void kgdb_trap(struct pt_regs *regs);
32 
33 /* This is the numbering of registers according to the GDB. See GDB's
34  * arc-tdep.h for details.
35  *
36  * Registers are ordered for GDB 7.5. It is incompatible with GDB 6.8. */
37 enum arc_linux_regnums {
38 	_R0		= 0,
39 	_R1, _R2, _R3, _R4, _R5, _R6, _R7, _R8, _R9, _R10, _R11, _R12, _R13,
40 	_R14, _R15, _R16, _R17, _R18, _R19, _R20, _R21, _R22, _R23, _R24,
41 	_R25, _R26,
42 	_FP		= 27,
43 	__SP		= 28,
44 	_R30		= 30,
45 	_BLINK		= 31,
46 	_LP_COUNT	= 60,
47 	_STOP_PC	= 64,
48 	_RET		= 64,
49 	_LP_START	= 65,
50 	_LP_END		= 66,
51 	_STATUS32	= 67,
52 	_ECR		= 76,
53 	_BTA		= 82,
54 };
55 
56 #else
57 #define kgdb_trap(regs)
58 #endif
59 
60 #endif	/* __ARC_KGDB_H__ */
61