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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
/* Low-level RSP routines for GDB, the GNU debugger.
Copyright (C) 1988-2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "common-defs.h"
#include "rsp-low.h"
/* See rsp-low.h. */
int
fromhex (int a)
{
if (a >= '0' && a <= '9')
return a - '0';
else if (a >= 'a' && a <= 'f')
return a - 'a' + 10;
else if (a >= 'A' && a <= 'F')
return a - 'A' + 10;
else
error (_("Reply contains invalid hex digit %d"), a);
}
/* See rsp-low.h. */
int
tohex (int nib)
{
if (nib < 10)
return '0' + nib;
else
return 'a' + nib - 10;
}
/* Encode 64 bits in 16 chars of hex. */
static const char hexchars[] = "0123456789abcdef";
static int
ishex (int ch, int *val)
{
if ((ch >= 'a') && (ch <= 'f'))
{
*val = ch - 'a' + 10;
return 1;
}
if ((ch >= 'A') && (ch <= 'F'))
{
*val = ch - 'A' + 10;
return 1;
}
if ((ch >= '0') && (ch <= '9'))
{
*val = ch - '0';
return 1;
}
return 0;
}
/* See rsp-low.h. */
char *
pack_nibble (char *buf, int nibble)
{
*buf++ = hexchars[(nibble & 0x0f)];
return buf;
}
/* See rsp-low.h. */
char *
pack_hex_byte (char *pkt, int byte)
{
*pkt++ = hexchars[(byte >> 4) & 0xf];
*pkt++ = hexchars[(byte & 0xf)];
return pkt;
}
/* See rsp-low.h. */
char *
unpack_varlen_hex (char *buff, /* packet to parse */
ULONGEST *result)
{
int nibble;
ULONGEST retval = 0;
while (ishex (*buff, &nibble))
{
buff++;
retval = retval << 4;
retval |= nibble & 0x0f;
}
*result = retval;
return buff;
}
/* See rsp-low.h. */
int
hex2bin (const char *hex, gdb_byte *bin, int count)
{
int i;
for (i = 0; i < count; i++)
{
if (hex[0] == 0 || hex[1] == 0)
{
/* Hex string is short, or of uneven length.
Return the count that has been converted so far. */
return i;
}
*bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]);
hex += 2;
}
return i;
}
/* See rsp-low.h. */
int
bin2hex (const gdb_byte *bin, char *hex, int count)
{
int i;
for (i = 0; i < count; i++)
{
*hex++ = tohex ((*bin >> 4) & 0xf);
*hex++ = tohex (*bin++ & 0xf);
}
*hex = 0;
return i;
}
/* Return whether byte B needs escaping when sent as part of binary data. */
static int
needs_escaping (gdb_byte b)
{
return b == '$' || b == '#' || b == '}' || b == '*';
}
/* See rsp-low.h. */
int
remote_escape_output (const gdb_byte *buffer, int len_units, int unit_size,
gdb_byte *out_buf, int *out_len_units,
int out_maxlen_bytes)
{
int input_unit_index, output_byte_index = 0, byte_index_in_unit;
int number_escape_bytes_needed;
/* Try to copy integral addressable memory units until
(1) we run out of space or
(2) we copied all of them. */
for (input_unit_index = 0;
input_unit_index < len_units;
input_unit_index++)
{
/* Find out how many escape bytes we need for this unit. */
number_escape_bytes_needed = 0;
for (byte_index_in_unit = 0;
byte_index_in_unit < unit_size;
byte_index_in_unit++)
{
int idx = input_unit_index * unit_size + byte_index_in_unit;
gdb_byte b = buffer[idx];
if (needs_escaping (b))
number_escape_bytes_needed++;
}
/* Check if we have room to fit this escaped unit. */
if (output_byte_index + unit_size + number_escape_bytes_needed >
out_maxlen_bytes)
break;
/* Copy the unit byte per byte, adding escapes. */
for (byte_index_in_unit = 0;
byte_index_in_unit < unit_size;
byte_index_in_unit++)
{
int idx = input_unit_index * unit_size + byte_index_in_unit;
gdb_byte b = buffer[idx];
if (needs_escaping (b))
{
out_buf[output_byte_index++] = '}';
out_buf[output_byte_index++] = b ^ 0x20;
}
else
out_buf[output_byte_index++] = b;
}
}
*out_len_units = input_unit_index;
return output_byte_index;
}
/* See rsp-low.h. */
int
remote_unescape_input (const gdb_byte *buffer, int len,
gdb_byte *out_buf, int out_maxlen)
{
int input_index, output_index;
int escaped;
output_index = 0;
escaped = 0;
for (input_index = 0; input_index < len; input_index++)
{
gdb_byte b = buffer[input_index];
if (output_index + 1 > out_maxlen)
error (_("Received too much data from the target."));
if (escaped)
{
out_buf[output_index++] = b ^ 0x20;
escaped = 0;
}
else if (b == '}')
escaped = 1;
else
out_buf[output_index++] = b;
}
if (escaped)
error (_("Unmatched escape character in target response."));
return output_index;
}
|
