1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_KGDB_H
3#define _ASM_X86_KGDB_H
4
5/*
6 * Copyright (C) 2001-2004 Amit S. Kale
7 * Copyright (C) 2008 Wind River Systems, Inc.
8 */
9
10#include <asm/ptrace.h>
11
12/*
13 * BUFMAX defines the maximum number of characters in inbound/outbound
14 * buffers at least NUMREGBYTES*2 are needed for register packets
15 * Longer buffer is needed to list all threads
16 */
17#define BUFMAX			1024
18
19/*
20 *  Note that this register image is in a different order than
21 *  the register image that Linux produces at interrupt time.
22 *
23 *  Linux's register image is defined by struct pt_regs in ptrace.h.
24 *  Just why GDB uses a different order is a historical mystery.
25 */
26#ifdef CONFIG_X86_32
27enum regnames {
28	GDB_AX,			/* 0 */
29	GDB_CX,			/* 1 */
30	GDB_DX,			/* 2 */
31	GDB_BX,			/* 3 */
32	GDB_SP,			/* 4 */
33	GDB_BP,			/* 5 */
34	GDB_SI,			/* 6 */
35	GDB_DI,			/* 7 */
36	GDB_PC,			/* 8 also known as eip */
37	GDB_PS,			/* 9 also known as eflags */
38	GDB_CS,			/* 10 */
39	GDB_SS,			/* 11 */
40	GDB_DS,			/* 12 */
41	GDB_ES,			/* 13 */
42	GDB_FS,			/* 14 */
43	GDB_GS,			/* 15 */
44};
45#define GDB_ORIG_AX		41
46#define DBG_MAX_REG_NUM		16
47#define NUMREGBYTES		((GDB_GS+1)*4)
48#else /* ! CONFIG_X86_32 */
49enum regnames {
50	GDB_AX,			/* 0 */
51	GDB_BX,			/* 1 */
52	GDB_CX,			/* 2 */
53	GDB_DX,			/* 3 */
54	GDB_SI,			/* 4 */
55	GDB_DI,			/* 5 */
56	GDB_BP,			/* 6 */
57	GDB_SP,			/* 7 */
58	GDB_R8,			/* 8 */
59	GDB_R9,			/* 9 */
60	GDB_R10,		/* 10 */
61	GDB_R11,		/* 11 */
62	GDB_R12,		/* 12 */
63	GDB_R13,		/* 13 */
64	GDB_R14,		/* 14 */
65	GDB_R15,		/* 15 */
66	GDB_PC,			/* 16 */
67	GDB_PS,			/* 17 */
68	GDB_CS,			/* 18 */
69	GDB_SS,			/* 19 */
70	GDB_DS,			/* 20 */
71	GDB_ES,			/* 21 */
72	GDB_FS,			/* 22 */
73	GDB_GS,			/* 23 */
74};
75#define GDB_ORIG_AX		57
76#define DBG_MAX_REG_NUM		24
77/* 17 64 bit regs and 5 32 bit regs */
78#define NUMREGBYTES		((17 * 8) + (5 * 4))
79#endif /* ! CONFIG_X86_32 */
80
81static inline void arch_kgdb_breakpoint(void)
82{
83	asm("   int $3");
84}
85#define BREAK_INSTR_SIZE	1
86#define CACHE_FLUSH_IS_SAFE	1
87#define GDB_ADJUSTS_BREAK_OFFSET
88
89extern int kgdb_ll_trap(int cmd, const char *str,
90			struct pt_regs *regs, long err, int trap, int sig);
91
92#endif /* _ASM_X86_KGDB_H */
93