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117d9ec2 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"
b8e461ff 16#include "util.h"
117d9ec2 17
f71f4deb 18// BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
19// Also used to hold various smaller buffers and the Mifare Emulator Memory.
20
f4329b17
I
21/* BigBuf memory layout:
22Pointer to highest available memory: BigBuf_hi
23
24 high BIGBUF_SIZE
25 reserved = BigBuf_malloc() subtracts amount from BigBuf_hi,
26 low 0x00
27*/
28
f71f4deb 29// declare it as uint32_t to achieve alignment to 4 Byte boundary
30static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
117d9ec2 31
32// High memory mark
33static uint16_t BigBuf_hi = BIGBUF_SIZE;
34
f71f4deb 35// pointer to the emulator memory.
36static uint8_t *emulator_memory = NULL;
37
3000dc4e
MHS
38// trace related variables
39static uint16_t traceLen = 0;
40int tracing = 1; //Last global one.. todo static?
117d9ec2 41
42// get the address of BigBuf
43uint8_t *BigBuf_get_addr(void)
44{
f71f4deb 45 return (uint8_t *)BigBuf;
46}
47
48
49// get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
50uint8_t *BigBuf_get_EM_addr(void)
51{
f4329b17
I
52 // not yet allocated
53 if (emulator_memory == NULL) {
f71f4deb 54 emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
55 }
56
57 return emulator_memory;
117d9ec2 58}
59
60
61// clear ALL of BigBuf
62void BigBuf_Clear(void)
7cfc777b 63{
64 BigBuf_Clear_ext(true);
65}
66// clear ALL of BigBuf
67void BigBuf_Clear_ext(bool verbose)
117d9ec2 68{
69 memset(BigBuf,0,BIGBUF_SIZE);
7cfc777b 70 if (verbose)
71 Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
117d9ec2 72}
f4329b17
I
73void BigBuf_Clear_EM(void){
74 memset(BigBuf_get_EM_addr(), 0, CARD_MEMORY_SIZE);
75}
117d9ec2 76
3cec7061 77void BigBuf_Clear_keep_EM(void)
78{
79 memset(BigBuf,0,BigBuf_hi);
80}
117d9ec2 81
f71f4deb 82// allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
83// at the beginning of BigBuf is always for traces/samples
117d9ec2 84uint8_t *BigBuf_malloc(uint16_t chunksize)
85{
86 if (BigBuf_hi - chunksize < 0) {
f71f4deb 87 return NULL; // no memory left
117d9ec2 88 } else {
f71f4deb 89 chunksize = (chunksize + 3) & 0xfffc; // round to next multiple of 4
90 BigBuf_hi -= chunksize; // aligned to 4 Byte boundary
91 return (uint8_t *)BigBuf + BigBuf_hi;
117d9ec2 92 }
93}
94
95
f71f4deb 96// free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
117d9ec2 97void BigBuf_free(void)
98{
99 BigBuf_hi = BIGBUF_SIZE;
f71f4deb 100 emulator_memory = NULL;
101}
102
103
104// free allocated chunks EXCEPT the emulator memory
105void BigBuf_free_keep_EM(void)
106{
107 if (emulator_memory != NULL) {
108 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
109 } else {
110 BigBuf_hi = BIGBUF_SIZE;
111 }
117d9ec2 112}
113
e2012d1b
MHS
114void BigBuf_print_status(void)
115{
116 Dbprintf("Memory");
117 Dbprintf(" BIGBUF_SIZE.............%d", BIGBUF_SIZE);
f4329b17 118 Dbprintf(" Available memory........%d", BigBuf_hi);
e2012d1b
MHS
119 Dbprintf("Tracing");
120 Dbprintf(" tracing ................%d", tracing);
121 Dbprintf(" traceLen ...............%d", traceLen);
122}
123
117d9ec2 124
125// return the maximum trace length (i.e. the unallocated size of BigBuf)
f71f4deb 126uint16_t BigBuf_max_traceLen(void)
117d9ec2 127{
128 return BigBuf_hi;
f71f4deb 129}
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130
131void clear_trace() {
3000dc4e
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132 traceLen = 0;
133}
134
135void set_tracing(bool enable) {
136 tracing = enable;
137}
138
139/**
140 * Get the number of bytes traced
141 * @return
142 */
143uint16_t BigBuf_get_traceLen(void)
144{
145 return traceLen;
146}
147
148/**
149 This is a function to store traces. All protocols can use this generic tracer-function.
150 The traces produced by calling this function can be fetched on the client-side
151 by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
152 annotation of commands/responses.
153
154**/
155bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
156{
f4329b17 157 if (!tracing) return false;
3000dc4e
MHS
158
159 uint8_t *trace = BigBuf_get_addr();
160
161 uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity
162 uint16_t duration = timestamp_end - timestamp_start;
163
164 // Return when trace is full
165 uint16_t max_traceLen = BigBuf_max_traceLen();
166
167 if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
f4329b17
I
168 tracing = false; // don't trace any more
169 return false;
3000dc4e
MHS
170 }
171 // Traceformat:
172 // 32 bits timestamp (little endian)
173 // 16 bits duration (little endian)
174 // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
175 // y Bytes data
176 // x Bytes parity (one byte per 8 bytes data)
177
178 // timestamp (start)
179 trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
180 trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
181 trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
182 trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
183
184 // duration
185 trace[traceLen++] = ((duration >> 0) & 0xff);
186 trace[traceLen++] = ((duration >> 8) & 0xff);
187
188 // data length
189 trace[traceLen++] = ((iLen >> 0) & 0xff);
190 trace[traceLen++] = ((iLen >> 8) & 0xff);
191
192 // readerToTag flag
193 if (!readerToTag) {
194 trace[traceLen - 1] |= 0x80;
195 }
196
197 // data bytes
198 if (btBytes != NULL && iLen != 0) {
199 memcpy(trace + traceLen, btBytes, iLen);
200 }
201 traceLen += iLen;
202
203 // parity bytes
c4c3af7c 204 if (num_paritybytes != 0) {
48ece4a7 205 if (parity != NULL) {
206 memcpy(trace + traceLen, parity, num_paritybytes);
207 } else {
208 memset(trace + traceLen, 0x00, num_paritybytes);
209 }
3000dc4e
MHS
210 }
211 traceLen += num_paritybytes;
212
f4329b17 213 return true;
3000dc4e 214}
09ffd16e 215
216
beefe5bc 217int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
aabb719d 218{
beefe5bc
MHS
219 /**
220 Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
221 that this logger takes number of bits as argument, not number of bytes.
222 **/
aabb719d 223
f4329b17 224 if (!tracing) return false;
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MHS
225
226 uint8_t *trace = BigBuf_get_addr();
227 uint16_t iLen = nbytes(iBits);
aabb719d 228 // Return when trace is full
f4329b17 229 if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return false;
665775c8
MHS
230
231 //Hitag traces appear to use this traceformat:
232 // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
233 // 32 bits parity
beefe5bc 234 // 8 bits size (number of bits in the trace entry, not number of bytes)
665775c8 235 // y Bytes data
aabb719d 236
aabb719d
MHS
237 rsamples += iSamples;
238 trace[traceLen++] = ((rsamples >> 0) & 0xff);
239 trace[traceLen++] = ((rsamples >> 8) & 0xff);
240 trace[traceLen++] = ((rsamples >> 16) & 0xff);
241 trace[traceLen++] = ((rsamples >> 24) & 0xff);
665775c8 242
beefe5bc 243 if (!readerToTag) {
665775c8 244 trace[traceLen - 1] |= 0x80;
aabb719d 245 }
665775c8 246
aabb719d
MHS
247 trace[traceLen++] = ((dwParity >> 0) & 0xff);
248 trace[traceLen++] = ((dwParity >> 8) & 0xff);
249 trace[traceLen++] = ((dwParity >> 16) & 0xff);
250 trace[traceLen++] = ((dwParity >> 24) & 0xff);
251 trace[traceLen++] = iBits;
665775c8
MHS
252
253 memcpy(trace + traceLen, btBytes, iLen);
254 traceLen += iLen;
255
f4329b17 256 return true;
aabb719d 257}
48ece4a7 258
259
e80aeb96
MHS
260// Emulator memory
261uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
262 uint8_t* mem = BigBuf_get_EM_addr();
f4329b17 263 if (offset+length < CARD_MEMORY_SIZE) {
e80aeb96
MHS
264 memcpy(mem+offset, data, length);
265 return 0;
f4329b17 266 } else {
e80aeb96
MHS
267 Dbprintf("Error, trying to set memory outside of bounds! %d > %d", (offset+length), CARD_MEMORY_SIZE);
268 return 1;
269 }
270}
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