New branch with firmware dir from USRP2P branch.

1 files changed, 506 insertions, 0 deletions

diff --git a/firmware/microblaze/lib/gdbstub2.c b/firmware/microblaze/lib/gdbstub2.c
new file mode 100644
index 000000000..4c63dfce2
--- /dev/null
+++ b/firmware/microblaze/lib/gdbstub2.c
@@ -0,0 +1,506 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 Ettus Research LLC
+ *
+ * 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/>.
+ */
+
+/*
+ * Implement a eensy weensy part of the GDB Remote Serial Protocol
+ *
+ * See Appendix D of the GDB manual
+ *
+ *   m<addr>,<length> 		-- read <length> bytes of memory starting at <addr>
+ *     Reply:
+ *     XX...		XX... is memory contents in hex
+ *     ENN		ENN   NN is a hex error number
+ *
+ *   M<addr>,<length>:XX...     -- write memory, data in hex
+ *     Reply:
+ *     OK		for success
+ *     ENN		for an error.  NN is a hex error number
+ *
+ *   X<addr>,<length>:XX...     -- write memory, data in binary
+ *     Reply:
+ *     OK		for success
+ *     ENN		for an error.  NN is a hex error number
+ *
+ *   c<addr>			-- continue.  <addr> is the address to resume (goto).
+ *     Reply: <none>
+ *
+ *   \x80 New Format...
+ */
+
+#include "gdbstub2.h"
+#include "loader_parser.h"
+#include "hal_uart.h"
+#include <stdbool.h>
+#include <stddef.h>
+
+#define MAX_PACKET	1024
+
+/*
+ * Get raw character from serial port, no echo.
+ */
+static inline int 
+gdb_getc(void)
+{
+  return hal_uart_getc();
+}
+
+/*
+ * Put character to serial port.  Raw output.
+ */
+static inline void
+gdb_putc(int ch)
+{
+  hal_uart_putc(ch);
+}
+
+// ------------------------------------------------------------------------
+
+#define	GDB_ESCAPE 0x7d
+
+static unsigned char hex_table[16] = { 
+  '0', '1', '2', '3', '4', '5', '6', '7',
+  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
+};
+
+static int
+put_hex8_checksum(int ch, int checksum)
+{
+  unsigned char t = hex_table[(ch >> 4) & 0xf];
+  checksum += t;
+  gdb_putc(t);
+
+  t = hex_table[ch & 0xf];
+  checksum += t;
+  gdb_putc(t);
+  return checksum;
+}
+
+static void
+put_hex8(int ch)
+{
+  put_hex8_checksum(ch, 0);
+}
+
+static bool
+hex4_to_bin(int ch, int *value)
+{
+  if ('0' <= ch && ch <= '9'){
+    *value = ch - '0';
+    return true;
+  }
+  if ('a' <= ch && ch <= 'f'){
+    *value = ch - 'a' + 10;
+    return true;
+  }
+  if ('A' <= ch && ch <= 'F'){
+    *value = ch - 'A' + 10;
+    return true;
+  }
+  *value = 0;
+  return false;
+}
+
+static bool
+hex8_to_bin(const unsigned char *s, int *value)
+{
+  int v0, v1;
+  if (hex4_to_bin(s[0], &v0) && hex4_to_bin(s[1], &v1)){
+    *value = (v0 << 4) | v1;
+    return true;
+  }
+  return false;
+}
+
+static bool
+hex_to_bin_array(unsigned char *binary_data, const unsigned char *hex_data, size_t nbytes)
+{
+  for (size_t i = 0; i < nbytes; i++){
+    int t;
+    if (!hex8_to_bin(&hex_data[2*i], &t))
+      return false;
+    binary_data[i] = t;
+  }
+  return true;
+}
+
+static bool
+needs_escaping(int ch)
+{
+  return ch == '$' || ch == '#' || ch == GDB_ESCAPE;
+}
+
+/*
+ * \brief Wait for a packet.  
+ * \param[out] pkt_buf gets the received packet payload.
+ * \param[in]  max_size is the maximum number of bytes to write into \p pkt_buf.
+ * \param[out] actual_size is the number of bytes written to \p pkt_buf.
+ *
+ * \returns true iff the payload fits and the checksum is OK.
+ *
+ * Packets have this format:
+ *
+ *  $<packet-data>#<checksum>
+ *
+ * Where <packet-data> is anything and <checksum> is a two byte hex
+ * checksum.  In <packet-data> '$', '#' and 0x7d are escaped with 0x7d.
+ * The checksum is computed as the modulo 256 sum of all characters
+ * btween the leading '$' and the trailing '#' (an 8-bit unsigned
+ * checksum).
+ */
+static bool
+get_packet(unsigned char *pkt_buf, size_t max_size, size_t *actual_size)
+{
+  typedef enum states {
+    LOOKING_FOR_DOLLAR,
+    LOOKING_FOR_HASH,
+    CSUM1,
+    CSUM2,
+  } state_t;
+
+  *actual_size = 0;
+  unsigned char csum[2] = {0, 0};
+  state_t state = LOOKING_FOR_DOLLAR;
+  size_t  pi = 0;
+
+  while (1){
+    int ch = gdb_getc();
+
+    switch (state){
+    case LOOKING_FOR_DOLLAR:
+      if (ch == '$'){
+	pi = 0;
+	state = LOOKING_FOR_HASH;
+      }
+      else if (ch == '#'){	// most likely missed the $
+	return false;
+      }
+      break;
+	
+    case LOOKING_FOR_HASH:
+      if (ch == '$'){
+	return false;
+      }
+      else if (ch == '#'){
+	state = CSUM1;
+      }
+      else {
+	if (pi >= max_size)	// payload too big
+	  return false;
+
+	if (ch == GDB_ESCAPE)
+	  ch = gdb_getc();
+
+	pkt_buf[pi++] = ch;
+      }
+      break;
+      
+    case CSUM1:
+      csum[0] = ch;
+      state = CSUM2;
+      break;
+
+    case CSUM2:
+      csum[1] = ch;
+      *actual_size = pi;
+
+      // accept .. as a correct checksum
+      if (csum[0] == '.' && csum[1] == '.')
+	return true;
+
+      int expected_checksum;
+      if (!hex8_to_bin(csum, &expected_checksum))
+	return false;
+
+      int checksum = 0;
+      for (size_t i = 0; i < pi; i++)
+	checksum += pkt_buf[i];
+
+      checksum &= 0xff;
+      return checksum == expected_checksum;
+    }
+  }
+}
+
+static void
+put_packet_trailer(int checksum)
+{
+  gdb_putc('#');
+  put_hex8(checksum & 0xff);
+  gdb_putc('\r');
+  gdb_putc('\n');
+}
+
+static void
+put_packet(const unsigned char *pkt_buf, size_t size)
+{
+  gdb_putc('$');
+
+  int checksum = 0;
+  for (size_t i = 0; i < size; i++){
+    int ch = pkt_buf[i];
+    if (needs_escaping(ch))
+      gdb_putc(GDB_ESCAPE);
+    gdb_putc(ch);
+    checksum += ch;
+  }
+  put_packet_trailer(checksum);
+}
+
+/*!
+ * Read a hex number
+ *
+ * \param[inout] bufptr - pointer to pointer to buffer (updated on return)
+ * \param[in] end - one past end of valid data in buf
+ * \param[out] value - the parsed value
+ *
+ * \returns true iff a valid hex number was read from bufptr
+ */
+static bool
+parse_number(const unsigned char **bufptr, const unsigned char *end, unsigned int *value)
+{
+  const unsigned char *buf = *bufptr;
+  unsigned int v = 0;
+  bool valid = false;
+  int nibble;
+
+  while (buf < end && hex4_to_bin(*buf, &nibble)){
+    valid = true;
+    v = (v << 4) | nibble;
+    buf++;
+  }
+  
+  *value = v;
+  *bufptr = buf;
+  return valid;
+}
+
+static bool
+parse_char(const unsigned char **bufptr, const unsigned char *end, unsigned char *ch)
+{
+  const unsigned char *buf = *bufptr;
+  if (buf < end){
+    *ch = *buf++;
+    *bufptr = buf;
+    return true;
+  }
+  return false;
+}
+
+static bool
+expect_char(const unsigned char **bufptr, const unsigned char *end, unsigned char expected)
+{
+  unsigned char ch;
+  return parse_char(bufptr, end, &ch) && ch == expected;
+}
+
+static bool
+expect_end(const unsigned char **bufptr, const unsigned char *end)
+{
+  return *bufptr == end;
+}
+
+static bool
+parse_addr_length(const unsigned char **bufptr, const unsigned char *end,
+		  unsigned int *addr, unsigned int *length)
+{
+  return (parse_number(bufptr, end, addr)
+	  && expect_char(bufptr, end, ',')
+	  && parse_number(bufptr, end, length));
+}
+
+static void
+put_error(int error)
+{
+  unsigned char buf[3];
+  buf[0] = 'E';
+  buf[1] = hex_table[(error >> 4) & 0xf];
+  buf[2] = hex_table[error & 0xf];
+  
+  put_packet(buf, sizeof(buf));
+}
+
+static void
+put_ok(void)
+{
+  const unsigned char buf[2] = "OK";
+  put_packet(buf, sizeof(buf));
+}
+
+/*
+ * Read memory and send the reply.
+ * We do it on the fly so that our packet size is effectively unlimited
+ */
+static void
+read_memory(unsigned int addr, unsigned int nbytes)
+{
+  int checksum = 0;
+  gdb_putc('$');
+
+  if ((addr & 0x3) == 0 && (nbytes & 0x3) == 0){	// word aligned
+    union {
+      unsigned int	i;
+      unsigned char	c[4];
+    } u;
+
+    unsigned int *p = (unsigned int *) addr;
+    unsigned int length = nbytes / 4;
+
+    for (unsigned int i = 0; i < length; i++){
+      u.i = p[i];	// do a word read
+      checksum = put_hex8_checksum(u.c[0], checksum);
+      checksum = put_hex8_checksum(u.c[1], checksum);
+      checksum = put_hex8_checksum(u.c[2], checksum);
+      checksum = put_hex8_checksum(u.c[3], checksum);
+    }
+  }
+  else {						// byte aligned
+    unsigned char *p = (unsigned char *) addr;
+    for (unsigned int i = 0; i < nbytes; i++)
+      checksum = put_hex8_checksum(p[i], checksum);
+  }
+
+  put_packet_trailer(checksum);
+}
+
+static unsigned int
+get_unaligned_int(const unsigned char *p)
+{
+  // we're bigendian
+  return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]);
+}
+
+static bool
+write_memory(unsigned int addr, size_t nbytes,
+	     const unsigned char *data)
+{
+  if ((addr & 0x3) == 0 && (nbytes & 0x3) == 0){	// word-aligned dst
+    unsigned int *dst = (unsigned int *) addr;
+    size_t length = nbytes / 4;
+    for (size_t i = 0; i < length; i++){
+      unsigned int t = get_unaligned_int(&data[4*i]);
+      dst[i] = t;					// word writes
+    }
+  }
+  else {						// non-word-aligned dst
+    unsigned char *dst = (unsigned char *) addr;
+    for (size_t i = 0; i < nbytes; i++){
+      dst[i] = data[i];
+    }
+  }
+  return true;
+}
+
+void
+gdbstub2_main_loop(void)
+{
+  unsigned char inpkt[MAX_PACKET + 24];
+  unsigned char binary_data[MAX_PACKET/2] __attribute__((aligned (4)));
+
+  hal_uart_set_mode(UART_MODE_RAW); //tell UART HAL not to map \n to \r\n
+
+  while (1){
+    size_t	inpkt_len;
+    bool ok = get_packet(inpkt, sizeof(inpkt), &inpkt_len);
+    if (!ok){
+      gdb_putc('-');
+      continue;
+    }
+    gdb_putc('+');
+
+    const unsigned char *buf = inpkt;
+    const unsigned char *end = inpkt + inpkt_len;
+    unsigned char ch;
+
+    if (!parse_char(&buf, end, &ch)){	// empty packet
+      put_packet(0, 0);
+      continue;
+    }
+
+    unsigned int addr;
+    unsigned int length;
+
+    switch(ch){
+    case 'm':		// m<addr>,<length>  -- read <length> bytes starting at <addr>
+      if (!(parse_addr_length(&buf, end, &addr, &length) && expect_end(&buf, end))){
+	put_error(1);
+      }
+      else {
+	read_memory(addr, length);
+      }
+      break;
+
+    case 'M':		// M<addr>,<length>:XX...  -- write <length> bytes starting at <addr>
+			//   XX... is the data in hex
+      if (!(parse_addr_length(&buf, end, &addr, &length)
+	    && expect_char(&buf, end, ':')
+	    && (end - buf) == 2 * length)){
+	put_error(1);
+      }
+      else {
+	if (!hex_to_bin_array(binary_data, buf, length))
+	  put_error(2);
+	else if (!write_memory(addr, length, binary_data))
+	  put_error(3);
+	else
+	  put_ok();
+      }
+      break;
+
+    case 'X':		// X<addr>,<length>:XX...  -- write <length> bytes starting at <addr>
+			//   XX... is the data in binary
+      if (!(parse_addr_length(&buf, end, &addr, &length)
+	    && expect_char(&buf, end, ':')
+	    && (end - buf) == length)){
+	put_error(1);
+      }
+      else {
+	if (!write_memory(addr, length, buf))
+	  put_error(3);
+	else
+	  put_ok();
+      }
+      break;
+
+    case 'c':		// c<addr>	-- continue.  <addr> is the address to resume (goto).
+      if (!(parse_number(&buf, end, &addr)
+	    && expect_end(&buf, end))){
+	put_error(1);
+      }
+      else {
+	typedef void (*fptr_t)(void);
+	(*(fptr_t) addr)();	// most likely no return
+      }
+      break;
+/*
+    case 0x80:
+      {
+	unsigned char *output = binary_data;  // reuse
+	size_t sizeof_output = sizeof(binary_data);
+	size_t actual_olen;
+	loader_parser(buf, end-buf,
+		      output, sizeof_output, &actual_olen);
+	put_packet(output, actual_olen);
+      }
+      break;
+*/
+    default:		// unknown packet type
+      put_packet(0, 0);
+      break;
+    }
+  }
+}