1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Nios2 KGDB support
*
* Copyright (C) 2015 Altera Corporation
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
*
* Based on the code posted by Kazuyasu on the Altera Forum at:
* http://www.alteraforum.com/forum/showpost.php?p=77003&postcount=20
*/
#include <linux/ptrace.h>
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <linux/io.h>
static int wait_for_remote_debugger;
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
{ "zero", GDB_SIZEOF_REG, -1 },
{ "at", GDB_SIZEOF_REG, offsetof(struct pt_regs, r1) },
{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r2) },
{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r3) },
{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r4) },
{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r5) },
{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r6) },
{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r7) },
{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r8) },
{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r9) },
{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, r10) },
{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, r11) },
{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, r12) },
{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, r13) },
{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, r14) },
{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, r15) },
{ "r16", GDB_SIZEOF_REG, -1 },
{ "r17", GDB_SIZEOF_REG, -1 },
{ "r18", GDB_SIZEOF_REG, -1 },
{ "r19", GDB_SIZEOF_REG, -1 },
{ "r20", GDB_SIZEOF_REG, -1 },
{ "r21", GDB_SIZEOF_REG, -1 },
{ "r22", GDB_SIZEOF_REG, -1 },
{ "r23", GDB_SIZEOF_REG, -1 },
{ "et", GDB_SIZEOF_REG, -1 },
{ "bt", GDB_SIZEOF_REG, -1 },
{ "gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp) },
{ "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, sp) },
{ "fp", GDB_SIZEOF_REG, offsetof(struct pt_regs, fp) },
{ "ea", GDB_SIZEOF_REG, -1 },
{ "ba", GDB_SIZEOF_REG, -1 },
{ "ra", GDB_SIZEOF_REG, offsetof(struct pt_regs, ra) },
{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, ea) },
{ "status", GDB_SIZEOF_REG, -1 },
{ "estatus", GDB_SIZEOF_REG, offsetof(struct pt_regs, estatus) },
{ "bstatus", GDB_SIZEOF_REG, -1 },
{ "ienable", GDB_SIZEOF_REG, -1 },
{ "ipending", GDB_SIZEOF_REG, -1},
{ "cpuid", GDB_SIZEOF_REG, -1 },
{ "ctl6", GDB_SIZEOF_REG, -1 },
{ "exception", GDB_SIZEOF_REG, -1 },
{ "pteaddr", GDB_SIZEOF_REG, -1 },
{ "tlbacc", GDB_SIZEOF_REG, -1 },
{ "tlbmisc", GDB_SIZEOF_REG, -1 },
{ "eccinj", GDB_SIZEOF_REG, -1 },
{ "badaddr", GDB_SIZEOF_REG, -1 },
{ "config", GDB_SIZEOF_REG, -1 },
{ "mpubase", GDB_SIZEOF_REG, -1 },
{ "mpuacc", GDB_SIZEOF_REG, -1 },
};
char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return NULL;
if (dbg_reg_def[regno].offset != -1)
memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
dbg_reg_def[regno].size);
else
memset(mem, 0, dbg_reg_def[regno].size);
return dbg_reg_def[regno].name;
}
int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return -EINVAL;
if (dbg_reg_def[regno].offset != -1)
memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
dbg_reg_def[regno].size);
return 0;
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
memset((char *)gdb_regs, 0, NUMREGBYTES);
gdb_regs[GDB_SP] = p->thread.kregs->sp;
gdb_regs[GDB_PC] = p->thread.kregs->ea;
}
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
{
regs->ea = pc;
}
int kgdb_arch_handle_exception(int vector, int signo, int err_code,
char *remcom_in_buffer, char *remcom_out_buffer,
struct pt_regs *regs)
{
char *ptr;
unsigned long addr;
switch (remcom_in_buffer[0]) {
case 's':
case 'c':
/* handle the optional parameters */
ptr = &remcom_in_buffer[1];
if (kgdb_hex2long(&ptr, &addr))
regs->ea = addr;
return 0;
}
return -1; /* this means that we do not want to exit from the handler */
}
asmlinkage void kgdb_breakpoint_c(struct pt_regs *regs)
{
/*
* The breakpoint entry code has moved the PC on by 4 bytes, so we must
* move it back. This could be done on the host but we do it here
*/
if (!wait_for_remote_debugger)
regs->ea -= 4;
else /* pass the first trap 30 code */
wait_for_remote_debugger = 0;
kgdb_handle_exception(30, SIGTRAP, 0, regs);
}
int kgdb_arch_init(void)
{
wait_for_remote_debugger = 1;
return 0;
}
void kgdb_arch_exit(void)
{
/* Nothing to do */
}
const struct kgdb_arch arch_kgdb_ops = {
/* Breakpoint instruction: trap 30 */
.gdb_bpt_instr = { 0xba, 0x6f, 0x3b, 0x00 },
};
|
