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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup GDB
*
* @brief pc386 gdb select
*
* This file contains a routine to enable and select the UART the gdb stub
* connects too. Currently limited to COM1 and COM2. See
* shared/comm/i386-stub-glue.c file.
*/
/*
* COPYRIGHT (c) 2016.
* Chris Johns <chrisj@rtems.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdlib.h>
#include <limits.h>
#include <bsp.h>
#include <rtems/libio.h>
#include <rtems/console.h>
#include <rtems/termiostypes.h>
#include <libchip/serial.h>
#include <libchip/ns16550.h>
#include <bsp/bspimpl.h>
#include "../../shared/dev/serial/legacy-console.h"
/*
* Used in the stub to print output.
*/
int remote_debug;
/*
* Defined in the stub, used here.
*/
void set_debug_traps(void);
/*
* Added here to get a valid baudrate. Needs to go once we
* move to the standard UART driver.
*/
int BSPBaseBaud;
static bool gdb_port_probe(int minor)
{
/* Return false as GDB has claimed the port */
return false;
}
void pc386_parse_gdb_arguments(void)
{
static const char *opt;
/*
* Check the command line to see if com1-com4 are disabled.
*/
opt = bsp_cmdline_arg("--gdb=");
if ( opt ) {
const char *option;
const char *comma;
size_t length;
size_t index;
rtems_device_minor_number minor;
uint32_t baudrate = 115200;
bool halt = false;
console_tbl *port;
/*
* Fine the length, there can be more command line visible.
*/
length = 0;
while ((opt[length] != ' ') && (opt[length] != '\0')) {
++length;
if (length > NAME_MAX) {
printk("invalid option (--gdb): too long\n");
return;
}
}
/*
* Only match up to a comma or NULL
*/
index = 0;
while ((opt[index] != '=') && (index < length)) {
++index;
}
if (opt[index] != '=') {
printk("invalid option (--gdb): no equals\n");
return;
}
++index;
option = &opt[index];
while ((opt[index] != ',') && (index < length)) {
++index;
}
if (opt[index] == ',')
comma = &opt[index];
else
comma = NULL;
length = &opt[index] - option;
port = console_find_console_entry( option, length, &minor );
if ( port == NULL ) {
printk("invalid option (--gdb): port not found\n");
return;
}
if (comma) {
option = comma + 1;
baudrate = strtoul(option, 0, 10);
switch (baudrate) {
case 115200:
case 57600:
case 38400:
case 19200:
case 9600:
case 4800:
port->pDeviceParams = (void*) baudrate;
BSPBaseBaud = baudrate; /* REMOVE ME */
break;
default:
printk("invalid option (--gdb): bad baudrate\n");
return;
}
}
/*
* Provide a probe that fails so the device is not part of termios. All
* functions are polling.
*/
port->deviceProbe = gdb_port_probe;
port->pDeviceFns = &ns16550_fns_polled;
opt = bsp_cmdline_arg("--gdb-remote-debug");
if ( opt ) {
remote_debug = 1;
}
opt = bsp_cmdline_arg("--gdb-break");
if ( opt ) {
halt = true;
}
printk("GDB stub: enable %s%s%s\n",
port->sDeviceName,
remote_debug ? ", remote-debug" : "",
halt ? ", halting" : "");
i386_stub_glue_init(minor);
set_debug_traps();
i386_stub_glue_init_breakin();
if ( halt ) {
printk("GDB stub: waiting for remote connection..\n");
breakpoint();
}
}
}
|
