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9c3d6531 TT |
1 | /* Low-level RSP routines for GDB, the GNU debugger. |
2 | ||
3 | Copyright (C) 1988-2014 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifdef GDBSERVER | |
21 | #include "server.h" | |
22 | #else | |
23 | #include "defs.h" | |
24 | #endif | |
25 | ||
26 | #include <string.h> | |
27 | ||
28 | #include "rsp-low.h" | |
29 | ||
9d2d0b8b | 30 | /* See rsp-low.h. */ |
9c3d6531 TT |
31 | |
32 | int | |
33 | fromhex (int a) | |
34 | { | |
35 | if (a >= '0' && a <= '9') | |
36 | return a - '0'; | |
37 | else if (a >= 'a' && a <= 'f') | |
38 | return a - 'a' + 10; | |
39 | else if (a >= 'A' && a <= 'F') | |
40 | return a - 'A' + 10; | |
41 | else | |
42 | error (_("Reply contains invalid hex digit %d"), a); | |
43 | } | |
44 | ||
9d2d0b8b TT |
45 | /* See rsp-low.h. */ |
46 | ||
9c3d6531 TT |
47 | int |
48 | tohex (int nib) | |
49 | { | |
50 | if (nib < 10) | |
51 | return '0' + nib; | |
52 | else | |
53 | return 'a' + nib - 10; | |
54 | } | |
55 | ||
56 | /* Encode 64 bits in 16 chars of hex. */ | |
57 | ||
58 | static const char hexchars[] = "0123456789abcdef"; | |
59 | ||
60 | static int | |
61 | ishex (int ch, int *val) | |
62 | { | |
63 | if ((ch >= 'a') && (ch <= 'f')) | |
64 | { | |
65 | *val = ch - 'a' + 10; | |
66 | return 1; | |
67 | } | |
68 | if ((ch >= 'A') && (ch <= 'F')) | |
69 | { | |
70 | *val = ch - 'A' + 10; | |
71 | return 1; | |
72 | } | |
73 | if ((ch >= '0') && (ch <= '9')) | |
74 | { | |
75 | *val = ch - '0'; | |
76 | return 1; | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
9d2d0b8b TT |
81 | /* See rsp-low.h. */ |
82 | ||
9c3d6531 TT |
83 | char * |
84 | pack_nibble (char *buf, int nibble) | |
85 | { | |
86 | *buf++ = hexchars[(nibble & 0x0f)]; | |
87 | return buf; | |
88 | } | |
89 | ||
9d2d0b8b TT |
90 | /* See rsp-low.h. */ |
91 | ||
9c3d6531 TT |
92 | char * |
93 | pack_hex_byte (char *pkt, int byte) | |
94 | { | |
95 | *pkt++ = hexchars[(byte >> 4) & 0xf]; | |
96 | *pkt++ = hexchars[(byte & 0xf)]; | |
97 | return pkt; | |
98 | } | |
99 | ||
9d2d0b8b TT |
100 | /* See rsp-low.h. */ |
101 | ||
9c3d6531 TT |
102 | char * |
103 | unpack_varlen_hex (char *buff, /* packet to parse */ | |
104 | ULONGEST *result) | |
105 | { | |
106 | int nibble; | |
107 | ULONGEST retval = 0; | |
108 | ||
109 | while (ishex (*buff, &nibble)) | |
110 | { | |
111 | buff++; | |
112 | retval = retval << 4; | |
113 | retval |= nibble & 0x0f; | |
114 | } | |
115 | *result = retval; | |
116 | return buff; | |
117 | } | |
118 | ||
9d2d0b8b TT |
119 | /* See rsp-low.h. */ |
120 | ||
9c3d6531 TT |
121 | int |
122 | hex2bin (const char *hex, gdb_byte *bin, int count) | |
123 | { | |
124 | int i; | |
125 | ||
126 | for (i = 0; i < count; i++) | |
127 | { | |
128 | if (hex[0] == 0 || hex[1] == 0) | |
129 | { | |
130 | /* Hex string is short, or of uneven length. | |
131 | Return the count that has been converted so far. */ | |
132 | return i; | |
133 | } | |
134 | *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]); | |
135 | hex += 2; | |
136 | } | |
137 | return i; | |
138 | } | |
139 | ||
9d2d0b8b TT |
140 | /* See rsp-low.h. */ |
141 | ||
9c3d6531 TT |
142 | int |
143 | bin2hex (const gdb_byte *bin, char *hex, int count) | |
144 | { | |
145 | int i; | |
146 | ||
9c3d6531 TT |
147 | for (i = 0; i < count; i++) |
148 | { | |
149 | *hex++ = tohex ((*bin >> 4) & 0xf); | |
150 | *hex++ = tohex (*bin++ & 0xf); | |
151 | } | |
152 | *hex = 0; | |
153 | return i; | |
154 | } | |
155 | ||
9d2d0b8b TT |
156 | /* See rsp-low.h. */ |
157 | ||
9c3d6531 TT |
158 | int |
159 | remote_escape_output (const gdb_byte *buffer, int len, | |
160 | gdb_byte *out_buf, int *out_len, | |
161 | int out_maxlen) | |
162 | { | |
163 | int input_index, output_index; | |
164 | ||
165 | output_index = 0; | |
166 | for (input_index = 0; input_index < len; input_index++) | |
167 | { | |
168 | gdb_byte b = buffer[input_index]; | |
169 | ||
170 | if (b == '$' || b == '#' || b == '}' || b == '*') | |
171 | { | |
172 | /* These must be escaped. */ | |
173 | if (output_index + 2 > out_maxlen) | |
174 | break; | |
175 | out_buf[output_index++] = '}'; | |
176 | out_buf[output_index++] = b ^ 0x20; | |
177 | } | |
178 | else | |
179 | { | |
180 | if (output_index + 1 > out_maxlen) | |
181 | break; | |
182 | out_buf[output_index++] = b; | |
183 | } | |
184 | } | |
185 | ||
186 | *out_len = input_index; | |
187 | return output_index; | |
188 | } | |
189 | ||
9d2d0b8b TT |
190 | /* See rsp-low.h. */ |
191 | ||
9c3d6531 TT |
192 | int |
193 | remote_unescape_input (const gdb_byte *buffer, int len, | |
194 | gdb_byte *out_buf, int out_maxlen) | |
195 | { | |
196 | int input_index, output_index; | |
197 | int escaped; | |
198 | ||
199 | output_index = 0; | |
200 | escaped = 0; | |
201 | for (input_index = 0; input_index < len; input_index++) | |
202 | { | |
203 | gdb_byte b = buffer[input_index]; | |
204 | ||
205 | if (output_index + 1 > out_maxlen) | |
206 | error (_("Received too much data from the target.")); | |
207 | ||
208 | if (escaped) | |
209 | { | |
210 | out_buf[output_index++] = b ^ 0x20; | |
211 | escaped = 0; | |
212 | } | |
213 | else if (b == '}') | |
214 | escaped = 1; | |
215 | else | |
216 | out_buf[output_index++] = b; | |
217 | } | |
218 | ||
219 | if (escaped) | |
220 | error (_("Unmatched escape character in target response.")); | |
221 | ||
222 | return output_index; | |
223 | } | |
224 |