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[proxmark3-svn] / armsrc / BigBuf.c
1 //-----------------------------------------------------------------------------
2 // Jonathan Westhues, Aug 2005
3 // Gerhard de Koning Gans, April 2008, May 2011
4 //
5 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
6 // at your option, any later version. See the LICENSE.txt file for the text of
7 // the license.
8 //-----------------------------------------------------------------------------
9 // BigBuf and functions to allocate/free parts of it.
10 //-----------------------------------------------------------------------------
11
12 #include <stdint.h>
13 #include "proxmark3.h"
14 #include "apps.h"
15 #include "string.h"
16
17 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
18 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
19 // declare it as uint32_t to achieve alignment to 4 Byte boundary
20 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
21
22 /* BigBuf memory layout:
23 Pointer to highest available memory: BigBuf_hi
24
25 high BIGBUF_SIZE
26 reserved = BigBuf_malloc() subtracts amount from BigBuf_hi,
27 low 0x00
28 */
29
30 // High memory mark
31 static uint16_t BigBuf_hi = BIGBUF_SIZE;
32
33 // pointer to the emulator memory.
34 static uint8_t *emulator_memory = NULL;
35
36 // trace related variables
37 static uint16_t traceLen = 0;
38 int tracing = 1; //Last global one.. todo static?
39
40 // get the address of BigBuf
41 uint8_t *BigBuf_get_addr(void)
42 {
43 return (uint8_t *)BigBuf;
44 }
45
46
47 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
48 uint8_t *BigBuf_get_EM_addr(void)
49 {
50 // not yet allocated
51 if (emulator_memory == NULL)
52 emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
53
54 return emulator_memory;
55 }
56
57
58 // clear ALL of BigBuf
59 void BigBuf_Clear(void)
60 {
61 BigBuf_Clear_ext(true);
62 }
63 // clear ALL of BigBuf
64 void BigBuf_Clear_ext(bool verbose)
65 {
66 memset(BigBuf, 0, BIGBUF_SIZE);
67 if (verbose)
68 Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
69 }
70
71 void BigBuf_Clear_keep_EM(void)
72 {
73 memset(BigBuf, 0, BigBuf_hi);
74 }
75
76 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
77 // at the beginning of BigBuf is always for traces/samples
78 uint8_t *BigBuf_malloc(uint16_t chunksize)
79 {
80 if (BigBuf_hi - chunksize < 0) {
81 return NULL; // no memory left
82 } else {
83 chunksize = (chunksize + 3) & 0xfffc; // round to next multiple of 4
84 BigBuf_hi -= chunksize; // aligned to 4 Byte boundary
85 return (uint8_t *)BigBuf + BigBuf_hi;
86 }
87 }
88
89
90 // free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
91 void BigBuf_free(void)
92 {
93 BigBuf_hi = BIGBUF_SIZE;
94 emulator_memory = NULL;
95
96 // shouldn't this empty BigBuf also?
97 }
98
99
100 // free allocated chunks EXCEPT the emulator memory
101 void BigBuf_free_keep_EM(void)
102 {
103 if (emulator_memory != NULL)
104 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
105 else
106 BigBuf_hi = BIGBUF_SIZE;
107
108 // shouldn't this empty BigBuf also?
109 }
110
111 void BigBuf_print_status(void)
112 {
113 Dbprintf("Memory");
114 Dbprintf(" BIGBUF_SIZE.............%d", BIGBUF_SIZE);
115 Dbprintf(" Available memory........%d", BigBuf_hi);
116 Dbprintf("Tracing");
117 Dbprintf(" tracing ................%d", tracing);
118 Dbprintf(" traceLen ...............%d", traceLen);
119 }
120
121 // return the maximum trace length (i.e. the unallocated size of BigBuf)
122 uint16_t BigBuf_max_traceLen(void)
123 {
124 return BigBuf_hi;
125 }
126
127 void clear_trace() {
128 traceLen = 0;
129 }
130
131 void set_tracing(bool enable) {
132 tracing = enable;
133 }
134
135 /**
136 * Get the number of bytes traced
137 * @return
138 */
139 uint16_t BigBuf_get_traceLen(void)
140 {
141 return traceLen;
142 }
143
144 /**
145 This is a function to store traces. All protocols can use this generic tracer-function.
146 The traces produced by calling this function can be fetched on the client-side
147 by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
148 annotation of commands/responses.
149
150 **/
151 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
152 {
153 if (!tracing) return FALSE;
154
155 uint8_t *trace = BigBuf_get_addr();
156
157 uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity
158 uint16_t duration = timestamp_end - timestamp_start;
159
160 // Return when trace is full
161 if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= BigBuf_max_traceLen()) {
162 tracing = FALSE; // don't trace any more
163 return FALSE;
164 }
165 // Traceformat:
166 // 32 bits timestamp (little endian)
167 // 16 bits duration (little endian)
168 // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
169 // y Bytes data
170 // x Bytes parity (one byte per 8 bytes data)
171
172 // timestamp (start)
173 trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
174 trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
175 trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
176 trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
177
178 // duration
179 trace[traceLen++] = ((duration >> 0) & 0xff);
180 trace[traceLen++] = ((duration >> 8) & 0xff);
181
182 // data length
183 trace[traceLen++] = ((iLen >> 0) & 0xff);
184 trace[traceLen++] = ((iLen >> 8) & 0xff);
185
186 // readerToTag flag
187 if (!readerToTag) {
188 trace[traceLen - 1] |= 0x80;
189 }
190
191 // data bytes
192 if (btBytes != NULL && iLen != 0) {
193 memcpy(trace + traceLen, btBytes, iLen);
194 }
195 traceLen += iLen;
196
197 // parity bytes
198 if (num_paritybytes != 0) {
199 if (parity != NULL) {
200 memcpy(trace + traceLen, parity, num_paritybytes);
201 } else {
202 memset(trace + traceLen, 0x00, num_paritybytes);
203 }
204 }
205 traceLen += num_paritybytes;
206
207 return TRUE;
208 }
209
210
211 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
212 {
213 /**
214 Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
215 that this logger takes number of bits as argument, not number of bytes.
216 **/
217
218 if (!tracing) return FALSE;
219
220 uint8_t *trace = BigBuf_get_addr();
221 uint16_t iLen = nbytes(iBits);
222 // Return when trace is full
223 if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
224
225 //Hitag traces appear to use this traceformat:
226 // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
227 // 32 bits parity
228 // 8 bits size (number of bits in the trace entry, not number of bytes)
229 // y Bytes data
230
231 rsamples += iSamples;
232 trace[traceLen++] = ((rsamples >> 0) & 0xff);
233 trace[traceLen++] = ((rsamples >> 8) & 0xff);
234 trace[traceLen++] = ((rsamples >> 16) & 0xff);
235 trace[traceLen++] = ((rsamples >> 24) & 0xff);
236
237 if (!readerToTag) {
238 trace[traceLen - 1] |= 0x80;
239 }
240
241 trace[traceLen++] = ((dwParity >> 0) & 0xff);
242 trace[traceLen++] = ((dwParity >> 8) & 0xff);
243 trace[traceLen++] = ((dwParity >> 16) & 0xff);
244 trace[traceLen++] = ((dwParity >> 24) & 0xff);
245 trace[traceLen++] = iBits;
246
247 memcpy(trace + traceLen, btBytes, iLen);
248 traceLen += iLen;
249
250 return TRUE;
251 }
252
253
254 // Emulator memory
255 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
256 uint8_t* mem = BigBuf_get_EM_addr();
257 if(offset+length < CARD_MEMORY_SIZE)
258 {
259 memcpy(mem+offset, data, length);
260 return 0;
261 }else
262 {
263 Dbprintf("Error, trying to set memory outside of bounds! %d > %d", (offset+length), CARD_MEMORY_SIZE);
264 return 1;
265 }
266 }
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