//-----------------------------------------------------------------------------
// BigBuf and functions to allocate/free parts of it.
//-----------------------------------------------------------------------------
+#include "BigBuf.h"
-#include <stdint.h>
-#include "proxmark3.h"
-#include "apps.h"
-#include "string.h"
+// BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
+// Also used to hold various smaller buffers and the Mifare Emulator Memory.
+// declare it as uint32_t to achieve alignment to 4 Byte boundary
+static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
-// The large multi-purpose buffer, typically used to hold A/D samples or traces,
-// may be processed in some way. Also used to hold various smaller buffers.
-static uint8_t BigBuf[BIGBUF_SIZE];
+/* BigBuf memory layout:
+Pointer to highest available memory: BigBuf_hi
+
+ high BIGBUF_SIZE
+ reserved = BigBuf_malloc() subtracts amount from BigBuf_hi,
+ low 0x00
+*/
// High memory mark
static uint16_t BigBuf_hi = BIGBUF_SIZE;
-// trace related global variables. Change to function calls?
-//uint8_t *trace = BigBuf;
-uint16_t traceLen;
+// pointer to the emulator memory.
+static uint8_t *emulator_memory = NULL;
+// trace related variables
+static uint16_t traceLen = 0;
+int tracing = 1; //Last global one.. todo static?
// get the address of BigBuf
uint8_t *BigBuf_get_addr(void)
{
- return BigBuf;
+ return (uint8_t *)BigBuf;
}
+// get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
+uint8_t *BigBuf_get_EM_addr(void)
+{
+ // not yet allocated
+ if (emulator_memory == NULL)
+ emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
+
+ return emulator_memory;
+}
// clear ALL of BigBuf
void BigBuf_Clear(void)
{
- memset(BigBuf,0,BIGBUF_SIZE);
- Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
+ BigBuf_Clear_ext(true);
}
+// clear ALL of BigBuf
+void BigBuf_Clear_ext(bool verbose)
+{
+ memset(BigBuf, 0, BIGBUF_SIZE);
+ if (verbose)
+ Dbprintf("Buffer cleared (%i bytes)", BIGBUF_SIZE);
+}
-// allocate a chunk of memory from BigBuf. We allocate high memory first. Low memory
-// is always for traces/samples
+void BigBuf_Clear_keep_EM(void)
+{
+ memset(BigBuf, 0, BigBuf_hi);
+}
+
+// allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
+// at the beginning of BigBuf is always for traces/samples
uint8_t *BigBuf_malloc(uint16_t chunksize)
{
if (BigBuf_hi - chunksize < 0) {
- return NULL; // no memory left
+ return NULL; // no memory left
} else {
- BigBuf_hi -= chunksize; // aligned to 4 Byte boundary
- return BigBuf + BigBuf_hi;
+ chunksize = (chunksize + 3) & 0xfffc; // round to next multiple of 4
+ BigBuf_hi -= chunksize; // aligned to 4 Byte boundary
+ return (uint8_t *)BigBuf + BigBuf_hi;
}
}
-
-// free ALL allocated chunks. The whole BigBuf is available for traces again.
+// free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
void BigBuf_free(void)
{
BigBuf_hi = BIGBUF_SIZE;
+ emulator_memory = NULL;
+
+ // shouldn't this empty BigBuf also?
}
+// free allocated chunks EXCEPT the emulator memory
+void BigBuf_free_keep_EM(void)
+{
+ if (emulator_memory != NULL)
+ BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
+ else
+ BigBuf_hi = BIGBUF_SIZE;
+
+ // shouldn't this empty BigBuf also?
+}
+
+void BigBuf_print_status(void)
+{
+ Dbprintf("Memory");
+ Dbprintf(" BIGBUF_SIZE.............%d", BIGBUF_SIZE);
+ Dbprintf(" Available memory........%d", BigBuf_hi);
+ Dbprintf("Tracing");
+ Dbprintf(" tracing ................%d", tracing);
+ Dbprintf(" traceLen ...............%d", traceLen);
+}
// return the maximum trace length (i.e. the unallocated size of BigBuf)
-uint16_t BigBuf_max_trace_len(void)
+uint16_t BigBuf_max_traceLen(void)
{
return BigBuf_hi;
-}
\ No newline at end of file
+}
+
+void clear_trace() {
+ traceLen = 0;
+}
+
+void set_tracing(bool enable) {
+ tracing = enable;
+}
+
+/**
+ * Get the number of bytes traced
+ * @return
+ */
+uint16_t BigBuf_get_traceLen(void)
+{
+ return traceLen;
+}
+
+/**
+ This is a function to store traces. All protocols can use this generic tracer-function.
+ The traces produced by calling this function can be fetched on the client-side
+ by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
+ annotation of commands/responses.
+**/
+bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
+{
+ if (!tracing) return FALSE;
+
+ uint8_t *trace = BigBuf_get_addr();
+
+ uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity
+ uint16_t duration = timestamp_end - timestamp_start;
+
+ // Return when trace is full
+ if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= BigBuf_max_traceLen()) {
+ tracing = FALSE; // don't trace any more
+ return FALSE;
+ }
+ // Traceformat:
+ // 32 bits timestamp (little endian)
+ // 16 bits duration (little endian)
+ // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
+ // y Bytes data
+ // x Bytes parity (one byte per 8 bytes data)
+
+ // timestamp (start)
+ trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
+ trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
+ trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
+ trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
+
+ // duration
+ trace[traceLen++] = ((duration >> 0) & 0xff);
+ trace[traceLen++] = ((duration >> 8) & 0xff);
+
+ // data length
+ trace[traceLen++] = ((iLen >> 0) & 0xff);
+ trace[traceLen++] = ((iLen >> 8) & 0xff);
+
+ // readerToTag flag
+ if (!readerToTag) {
+ trace[traceLen - 1] |= 0x80;
+ }
+
+ // data bytes
+ if (btBytes != NULL && iLen != 0) {
+ memcpy(trace + traceLen, btBytes, iLen);
+ }
+ traceLen += iLen;
+
+ // parity bytes
+ if (num_paritybytes != 0) {
+ if (parity != NULL) {
+ memcpy(trace + traceLen, parity, num_paritybytes);
+ } else {
+ memset(trace + traceLen, 0x00, num_paritybytes);
+ }
+ }
+ traceLen += num_paritybytes;
+
+ return TRUE;
+}
+
+
+int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
+{
+ /**
+ Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
+ that this logger takes number of bits as argument, not number of bytes.
+ **/
+
+ if (!tracing) return FALSE;
+
+ uint8_t *trace = BigBuf_get_addr();
+ uint16_t iLen = nbytes(iBits);
+ // Return when trace is full
+ if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
+
+ //Hitag traces appear to use this traceformat:
+ // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
+ // 32 bits parity
+ // 8 bits size (number of bits in the trace entry, not number of bytes)
+ // y Bytes data
+
+ rsamples += iSamples;
+ trace[traceLen++] = ((rsamples >> 0) & 0xff);
+ trace[traceLen++] = ((rsamples >> 8) & 0xff);
+ trace[traceLen++] = ((rsamples >> 16) & 0xff);
+ trace[traceLen++] = ((rsamples >> 24) & 0xff);
+
+ if (!readerToTag) {
+ trace[traceLen - 1] |= 0x80;
+ }
+
+ trace[traceLen++] = ((dwParity >> 0) & 0xff);
+ trace[traceLen++] = ((dwParity >> 8) & 0xff);
+ trace[traceLen++] = ((dwParity >> 16) & 0xff);
+ trace[traceLen++] = ((dwParity >> 24) & 0xff);
+ trace[traceLen++] = iBits;
+
+ memcpy(trace + traceLen, btBytes, iLen);
+ traceLen += iLen;
+
+ return TRUE;
+}
+
+
+// Emulator memory
+uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
+ uint8_t* mem = BigBuf_get_EM_addr();
+ if(offset+length < CARD_MEMORY_SIZE) {
+ memcpy(mem+offset, data, length);
+ return 0;
+ } else {
+ Dbprintf("Error, trying to set memory outside of bounds! %d > %d", (offset+length), CARD_MEMORY_SIZE);
+ return 1;
+ }
+}
projects / proxmark3-svn / blobdiff