command_handler: change 'cmd_ctx' to CMD_CTX
[fw/openocd] / src / server / gdb_server.c
index d5c3f3510ae9104097eba4de1898424403a1f169..9605f81abef45ef443ff839323da92b14aa883fb 100644 (file)
@@ -2,7 +2,7 @@
  *   Copyright (C) 2005 by Dominic Rath                                    *
  *   Dominic.Rath@gmx.de                                                   *
  *                                                                         *
- *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
+ *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
  *   oyvind.harboe@zylin.com                                               *
  *                                                                         *
  *   Copyright (C) 2008 by Spencer Oliver                                  *
 #include "config.h"
 #endif
 
-#include "gdb_server.h"
+#include "breakpoints.h"
 #include "target_request.h"
 #include "register.h"
 #include "server.h"
 #include "flash.h"
+#include "gdb_server.h"
 #include "image.h"
 #include "jtag.h"
 
 #define _DEBUG_GDB_IO_
 #endif
 
+static struct gdb_connection *current_gdb_connection;
+
 static int gdb_breakpoint_override;
 static enum breakpoint_type gdb_breakpoint_override_type;
 
-extern int gdb_error(connection_t *connection, int retval);
-static unsigned short gdb_port;
+extern int gdb_error(struct connection *connection, int retval);
+static unsigned short gdb_port = 3333;
 static const char *DIGITS = "0123456789abcdef";
 
-static void gdb_log_callback(void *priv, const char *file, int line,
+static void gdb_log_callback(void *priv, const char *file, unsigned line,
                const char *function, const char *string);
 
-enum gdb_detach_mode
-{
-       GDB_DETACH_RESUME,
-       GDB_DETACH_RESET,
-       GDB_DETACH_HALT,
-       GDB_DETACH_NOTHING
-};
-
-/* target behaviour on gdb detach */
-enum gdb_detach_mode detach_mode = GDB_DETACH_RESUME;
-
 /* number of gdb connections, mainly to supress gdb related debugging spam
  * in helper/log.c when no gdb connections are actually active */
 int gdb_actual_connections;
@@ -76,7 +68,7 @@ int gdb_flash_program = 1;
  * see the code in gdb_read_memory_packet() for further explanations */
 int gdb_report_data_abort = 0;
 
-int gdb_last_signal(target_t *target)
+int gdb_last_signal(struct target *target)
 {
        switch (target->debug_reason)
        {
@@ -96,20 +88,20 @@ int gdb_last_signal(target_t *target)
        }
 }
 
-int check_pending(connection_t *connection, int timeout_s, int *got_data)
+int check_pending(struct connection *connection, int timeout_s, int *got_data)
 {
        /* a non-blocking socket will block if there is 0 bytes available on the socket,
         * but return with as many bytes as are available immediately
         */
        struct timeval tv;
        fd_set read_fds;
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        int t;
-       if (got_data==NULL)
+       if (got_data == NULL)
                got_data=&t;
-       *got_data=0;
+       *got_data = 0;
 
-       if (gdb_con->buf_cnt>0)
+       if (gdb_con->buf_cnt > 0)
        {
                *got_data = 1;
                return ERROR_OK;
@@ -125,7 +117,7 @@ int check_pending(connection_t *connection, int timeout_s, int *got_data)
                /* This can typically be because a "monitor" command took too long
                 * before printing any progress messages
                 */
-               if (timeout_s>0)
+               if (timeout_s > 0)
                {
                        return ERROR_GDB_TIMEOUT;
                } else
@@ -133,14 +125,14 @@ int check_pending(connection_t *connection, int timeout_s, int *got_data)
                        return ERROR_OK;
                }
        }
-       *got_data=FD_ISSET(connection->fd, &read_fds)!=0;
+       *got_data = FD_ISSET(connection->fd, &read_fds) != 0;
        return ERROR_OK;
 }
 
-int gdb_get_char(connection_t *connection, int* next_char)
+int gdb_get_char(struct connection *connection, int* next_char)
 {
-       gdb_connection_t *gdb_con = connection->priv;
-       int retval=ERROR_OK;
+       struct gdb_connection *gdb_con = connection->priv;
+       int retval = ERROR_OK;
 
 #ifdef _DEBUG_GDB_IO_
        char *debug_buffer;
@@ -188,7 +180,7 @@ int gdb_get_char(connection_t *connection, int* next_char)
 #ifdef _WIN32
                errno = WSAGetLastError();
 
-               switch(errno)
+               switch (errno)
                {
                        case WSAEWOULDBLOCK:
                                usleep(1000);
@@ -204,7 +196,7 @@ int gdb_get_char(connection_t *connection, int* next_char)
                                exit(-1);
                }
 #else
-               switch(errno)
+               switch (errno)
                {
                        case EAGAIN:
                                usleep(1000);
@@ -245,9 +237,9 @@ int gdb_get_char(connection_t *connection, int* next_char)
        return retval;
 }
 
-int gdb_putback_char(connection_t *connection, int last_char)
+int gdb_putback_char(struct connection *connection, int last_char)
 {
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
 
        if (gdb_con->buf_p > gdb_con->buffer)
        {
@@ -265,9 +257,9 @@ int gdb_putback_char(connection_t *connection, int last_char)
 /* The only way we can detect that the socket is closed is the first time
  * we write to it, we will fail. Subsequent write operations will
  * succeed. Shudder! */
-int gdb_write(connection_t *connection, void *data, int len)
+int gdb_write(struct connection *connection, void *data, int len)
 {
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        if (gdb_con->closed)
                return ERROR_SERVER_REMOTE_CLOSED;
 
@@ -290,7 +282,7 @@ int gdb_write(connection_t *connection, void *data, int len)
        return ERROR_SERVER_REMOTE_CLOSED;
 }
 
-int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
+int gdb_put_packet_inner(struct connection *connection, char *buffer, int len)
 {
        int i;
        unsigned char my_checksum = 0;
@@ -299,7 +291,7 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
 #endif
        int reply;
        int retval;
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
 
        for (i = 0; i < len; i++)
                my_checksum += buffer[i];
@@ -313,15 +305,15 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
        int gotdata;
        for (;;)
        {
-               if ((retval=check_pending(connection, 0, &gotdata))!=ERROR_OK)
+               if ((retval = check_pending(connection, 0, &gotdata)) != ERROR_OK)
                        return retval;
                if (!gotdata)
                        break;
                if ((retval = gdb_get_char(connection, &reply)) != ERROR_OK)
                        return retval;
-               if( reply == '$' ){
+               if (reply == '$') {
                        /* fix a problem with some IAR tools */
-                       gdb_putback_char( connection, reply );
+                       gdb_putback_char(connection, reply);
                        LOG_DEBUG("Unexpected start of new packet");
                        break;
                }
@@ -345,11 +337,11 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
                if ((size_t)len + 4 <= sizeof(local_buffer))
                {
                        /* performance gain on smaller packets by only a single call to gdb_write() */
-                       memcpy(local_buffer+1, buffer, len++);
+                       memcpy(local_buffer + 1, buffer, len++);
                        local_buffer[len++] = '#';
                        local_buffer[len++] = DIGITS[(my_checksum >> 4) & 0xf];
                        local_buffer[len++] = DIGITS[my_checksum & 0xf];
-                       if((retval = gdb_write(connection, local_buffer, len)) != ERROR_OK)
+                       if ((retval = gdb_write(connection, local_buffer, len)) != ERROR_OK)
                        {
                                return retval;
                        }
@@ -361,15 +353,15 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
                        local_buffer[1] = '#';
                        local_buffer[2] = DIGITS[(my_checksum >> 4) & 0xf];
                        local_buffer[3] = DIGITS[my_checksum & 0xf];
-                       if((retval = gdb_write(connection, local_buffer, 1)) != ERROR_OK)
+                       if ((retval = gdb_write(connection, local_buffer, 1)) != ERROR_OK)
                        {
                                return retval;
                        }
-                       if((retval = gdb_write(connection, buffer, len)) != ERROR_OK)
+                       if ((retval = gdb_write(connection, buffer, len)) != ERROR_OK)
                        {
                                return retval;
                        }
-                       if((retval = gdb_write(connection, local_buffer+1, 3)) != ERROR_OK)
+                       if ((retval = gdb_write(connection, local_buffer + 1, 3)) != ERROR_OK)
                        {
                                return retval;
                        }
@@ -402,26 +394,26 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
                                log_remove_callback(gdb_log_callback, connection);
                                LOG_WARNING("negative reply, retrying");
                        }
-                       else if( reply == '$' ){
+                       else if (reply == '$') {
                                LOG_ERROR("GDB missing ack(1) - assumed good");
-                               gdb_putback_char( connection, reply );
+                               gdb_putback_char(connection, reply);
                                return ERROR_OK;
                        } else {
 
                                LOG_ERROR("unknown character(1) 0x%2.2x in reply, dropping connection", reply);
-                               gdb_con->closed=1;
+                               gdb_con->closed = 1;
                                return ERROR_SERVER_REMOTE_CLOSED;
                        }
                }
-               else if( reply == '$' ){
+               else if (reply == '$') {
                        LOG_ERROR("GDB missing ack(2) - assumed good");
-                       gdb_putback_char( connection, reply );
+                       gdb_putback_char(connection, reply);
                        return ERROR_OK;
                }
                else
                {
                        LOG_ERROR("unknown character(2) 0x%2.2x in reply, dropping connection", reply);
-                       gdb_con->closed=1;
+                       gdb_con->closed = 1;
                        return ERROR_SERVER_REMOTE_CLOSED;
                }
        }
@@ -431,9 +423,9 @@ int gdb_put_packet_inner(connection_t *connection, char *buffer, int len)
        return ERROR_OK;
 }
 
-int gdb_put_packet(connection_t *connection, char *buffer, int len)
+int gdb_put_packet(struct connection *connection, char *buffer, int len)
 {
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        gdb_con->busy = 1;
        int retval = gdb_put_packet_inner(connection, buffer, len);
        gdb_con->busy = 0;
@@ -444,14 +436,14 @@ int gdb_put_packet(connection_t *connection, char *buffer, int len)
        return retval;
 }
 
-static __inline__ int fetch_packet(connection_t *connection, int *checksum_ok, int noack, int *len, char *buffer)
+static __inline__ int fetch_packet(struct connection *connection, int *checksum_ok, int noack, int *len, char *buffer)
 {
        unsigned char my_checksum = 0;
        char checksum[3];
        int character;
        int retval;
 
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        my_checksum = 0;
        int count = 0;
        count = 0;
@@ -461,7 +453,7 @@ static __inline__ int fetch_packet(connection_t *connection, int *checksum_ok, i
                 * We need to leave at least 2 bytes in the buffer to have
                 * gdb_get_char() update various bits and bobs correctly.
                 */
-               if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt+count) < *len))
+               if ((gdb_con->buf_cnt > 2) && ((gdb_con->buf_cnt + count) < *len))
                {
                        /* The compiler will struggle a bit with constant propagation and
                         * aliasing, so we help it by showing that these values do not
@@ -547,17 +539,17 @@ static __inline__ int fetch_packet(connection_t *connection, int *checksum_ok, i
 
        if (!noack)
        {
-               *checksum_ok=(my_checksum == strtoul(checksum, NULL, 16));
+               *checksum_ok = (my_checksum == strtoul(checksum, NULL, 16));
        }
 
        return ERROR_OK;
 }
 
-int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len)
+int gdb_get_packet_inner(struct connection *connection, char *buffer, int *len)
 {
        int character;
        int retval;
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
 
        while (1)
        {
@@ -600,11 +592,11 @@ int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len)
                 */
                if (gdb_con->noack_mode)
                {
-                       if ((retval=fetch_packet(connection, &checksum_ok, 1, len, buffer))!=ERROR_OK)
+                       if ((retval = fetch_packet(connection, &checksum_ok, 1, len, buffer)) != ERROR_OK)
                                return retval;
                } else
                {
-                       if ((retval=fetch_packet(connection, &checksum_ok, 0, len, buffer))!=ERROR_OK)
+                       if ((retval = fetch_packet(connection, &checksum_ok, 0, len, buffer)) != ERROR_OK)
                                return retval;
                }
 
@@ -628,16 +620,16 @@ int gdb_get_packet_inner(connection_t *connection, char *buffer, int *len)
        return ERROR_OK;
 }
 
-int gdb_get_packet(connection_t *connection, char *buffer, int *len)
+int gdb_get_packet(struct connection *connection, char *buffer, int *len)
 {
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        gdb_con->busy = 1;
        int retval = gdb_get_packet_inner(connection, buffer, len);
        gdb_con->busy = 0;
        return retval;
 }
 
-int gdb_output_con(connection_t *connection, const char* line)
+int gdb_output_con(struct connection *connection, const char* line)
 {
        char *hex_buffer;
        int i, bin_size;
@@ -649,9 +641,9 @@ int gdb_output_con(connection_t *connection, const char* line)
                return ERROR_GDB_BUFFER_TOO_SMALL;
 
        hex_buffer[0] = 'O';
-       for (i=0; i<bin_size; i++)
+       for (i = 0; i < bin_size; i++)
                snprintf(hex_buffer + 1 + i*2, 3, "%2.2x", line[i]);
-       hex_buffer[bin_size*2+1] = 0;
+       hex_buffer[bin_size*2 + 1] = 0;
 
        int retval = gdb_put_packet(connection, hex_buffer, bin_size*2 + 1);
 
@@ -659,7 +651,7 @@ int gdb_output_con(connection_t *connection, const char* line)
        return retval;
 }
 
-int gdb_output(struct command_context_s *context, const char* line)
+int gdb_output(struct command_context *context, const char* line)
 {
        /* this will be dumped to the log and also sent as an O packet if possible */
        LOG_USER_N("%s", line);
@@ -667,11 +659,11 @@ int gdb_output(struct command_context_s *context, const char* line)
 }
 
 
-static void gdb_frontend_halted(struct target_s *target, connection_t *connection)
+static void gdb_frontend_halted(struct target *target, struct connection *connection)
 {
-       gdb_connection_t *gdb_connection = connection->priv;
+       struct gdb_connection *gdb_connection = connection->priv;
 
-       /* In the GDB protocol when we are stepping or coninuing execution,
+       /* In the GDB protocol when we are stepping or continuing execution,
         * we have a lingering reply. Upon receiving a halted event
         * when we have that lingering packet, we reply to the original
         * step or continue packet.
@@ -704,23 +696,23 @@ static void gdb_frontend_halted(struct target_s *target, connection_t *connectio
        }
 }
 
-int gdb_target_callback_event_handler(struct target_s *target, enum target_event event, void *priv)
+int gdb_target_callback_event_handler(struct target *target, enum target_event event, void *priv)
 {
        int retval;
-       connection_t *connection = priv;
+       struct connection *connection = priv;
 
-       target_handle_event( target, event );
+       target_handle_event(target, event);
        switch (event)
        {
-               case TARGET_EVENT_EARLY_HALTED:
+               case TARGET_EVENT_GDB_HALT:
                        gdb_frontend_halted(target, connection);
                        break;
                case TARGET_EVENT_HALTED:
                        target_call_event_callbacks(target, TARGET_EVENT_GDB_END);
                        break;
                case TARGET_EVENT_GDB_FLASH_ERASE_START:
-                       target_handle_event( target, TARGET_EVENT_OLD_gdb_program_config );
-                       if((retval = jtag_execute_queue()) != ERROR_OK)
+                       target_handle_event(target, TARGET_EVENT_OLD_gdb_program_config);
+                       if ((retval = jtag_execute_queue()) != ERROR_OK)
                        {
                                return retval;
                        }
@@ -732,10 +724,10 @@ int gdb_target_callback_event_handler(struct target_s *target, enum target_event
        return ERROR_OK;
 }
 
-int gdb_new_connection(connection_t *connection)
+int gdb_new_connection(struct connection *connection)
 {
-       gdb_connection_t *gdb_connection = malloc(sizeof(gdb_connection_t));
-       gdb_service_t *gdb_service = connection->service->priv;
+       struct gdb_connection *gdb_connection = malloc(sizeof(struct gdb_connection));
+       struct gdb_service *gdb_service = connection->service->priv;
        int retval;
        int initial_ack;
 
@@ -750,6 +742,7 @@ int gdb_new_connection(connection_t *connection)
        gdb_connection->closed = 0;
        gdb_connection->busy = 0;
        gdb_connection->noack_mode = 0;
+       gdb_connection->sync = true;
 
        /* send ACK to GDB for debug request */
        gdb_write(connection, "+", 1);
@@ -767,30 +760,6 @@ int gdb_new_connection(connection_t *connection)
        /* register callback to be informed about target events */
        target_register_event_callback(gdb_target_callback_event_handler, connection);
 
-       /* a gdb session just attached, try to put the target in halt mode.
-        *
-        * DANGER!!!!
-        *
-        * If the halt fails(e.g. target needs a reset, JTAG communication not
-        * working, etc.), then the GDB connect will succeed as
-        * the get_gdb_reg_list() will lie and return a register list with
-        * dummy values.
-        *
-        * This allows GDB monitor commands to be run from a GDB init script to
-        * initialize the target
-        *
-        * Also, since the halt() is asynchronous target connect will be
-        * instantaneous and thus avoiding annoying timeout problems during
-        * connect.
-        */
-       target_halt(gdb_service->target);
-       /* FIX!!!! could extended-remote work better here?
-        *
-        *  wait a tiny bit for halted state or we just continue. The
-        * GDB register packet will then contain garbage
-        */
-       target_wait_state(gdb_service->target, TARGET_HALTED, 500);
-
        /* remove the initial ACK from the incoming buffer */
        if ((retval = gdb_get_char(connection, &initial_ack)) != ERROR_OK)
                return retval;
@@ -800,19 +769,32 @@ int gdb_new_connection(connection_t *connection)
         */
        if (initial_ack != '+')
                gdb_putback_char(connection, initial_ack);
-       target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH );
+       target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_ATTACH);
 
        gdb_actual_connections++;
+       LOG_DEBUG("New GDB Connection: %d, Target %s, state: %s",
+                 gdb_actual_connections,
+                 gdb_service->target->cmd_name,
+                 target_state_name(gdb_service->target));
 
        return ERROR_OK;
 }
 
-int gdb_connection_closed(connection_t *connection)
+int gdb_connection_closed(struct connection *connection)
 {
-       gdb_service_t *gdb_service = connection->service->priv;
-       gdb_connection_t *gdb_connection = connection->priv;
+       struct gdb_service *gdb_service = connection->service->priv;
+       struct gdb_connection *gdb_connection = connection->priv;
+
+       /* we're done forwarding messages. Tear down callback before
+        * cleaning up connection.
+        */
+       log_remove_callback(gdb_log_callback, connection);
 
        gdb_actual_connections--;
+       LOG_DEBUG("GDB Close, Target: %s, state: %s, gdb_actual_connections=%d",
+                 gdb_service->target->cmd_name,
+                 target_state_name(gdb_service->target),
+                 gdb_actual_connections);
 
        /* see if an image built with vFlash commands is left */
        if (gdb_connection->vflash_image)
@@ -835,23 +817,24 @@ int gdb_connection_closed(connection_t *connection)
                LOG_ERROR("BUG: connection->priv == NULL");
        }
 
+
        target_unregister_event_callback(gdb_target_callback_event_handler, connection);
+
        target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_END);
-       log_remove_callback(gdb_log_callback, connection);
 
-       target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH );
+       target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
 
        return ERROR_OK;
 }
 
-void gdb_send_error(connection_t *connection, u8 the_error)
+void gdb_send_error(struct connection *connection, uint8_t the_error)
 {
        char err[4];
-       snprintf(err, 4, "E%2.2X", the_error );
+       snprintf(err, 4, "E%2.2X", the_error);
        gdb_put_packet(connection, err, 3);
 }
 
-int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
+int gdb_last_signal_packet(struct connection *connection, struct target *target, char* packet, int packet_size)
 {
        char sig_reply[4];
        int signal;
@@ -864,7 +847,7 @@ int gdb_last_signal_packet(connection_t *connection, target_t *target, char* pac
        return ERROR_OK;
 }
 
-static int gdb_reg_pos(target_t *target, int pos, int len)
+static int gdb_reg_pos(struct target *target, int pos, int len)
 {
        if (target->endianness == TARGET_LITTLE_ENDIAN)
                return pos;
@@ -881,20 +864,20 @@ static int gdb_reg_pos(target_t *target, int pos, int len)
  * The format of reg->value is little endian
  *
  */
-void gdb_str_to_target(target_t *target, char *tstr, reg_t *reg)
+void gdb_str_to_target(struct target *target, char *tstr, struct reg *reg)
 {
        int i;
 
-       u8 *buf;
+       uint8_t *buf;
        int buf_len;
        buf = reg->value;
-       buf_len = CEIL(reg->size, 8);
+       buf_len = DIV_ROUND_UP(reg->size, 8);
 
        for (i = 0; i < buf_len; i++)
        {
                int j = gdb_reg_pos(target, i, buf_len);
                tstr[i*2]   = DIGITS[(buf[j]>>4) & 0xf];
-               tstr[i*2+1] = DIGITS[buf[j]&0xf];
+               tstr[i*2 + 1] = DIGITS[buf[j]&0xf];
        }
 }
 
@@ -904,7 +887,7 @@ static int hextoint(char c)
        {
                return c-'0';
        }
-       c=toupper(c);
+       c = toupper(c);
        if (c>='A'&&c<='F')
        {
                return c-'A'+10;
@@ -914,7 +897,7 @@ static int hextoint(char c)
 }
 
 /* copy over in register buffer */
-void gdb_target_to_reg(target_t *target, char *tstr, int str_len, u8 *bin)
+void gdb_target_to_reg(struct target *target, char *tstr, int str_len, uint8_t *bin)
 {
        if (str_len % 2)
        {
@@ -923,19 +906,19 @@ void gdb_target_to_reg(target_t *target, char *tstr, int str_len, u8 *bin)
        }
 
        int i;
-       for (i = 0; i < str_len; i+=2)
+       for (i = 0; i < str_len; i += 2)
        {
-               u8 t = hextoint(tstr[i])<<4;
-               t |= hextoint(tstr[i+1]);
+               uint8_t t = hextoint(tstr[i]) << 4;
+               t |= hextoint(tstr[i + 1]);
 
                int j = gdb_reg_pos(target, i/2, str_len/2);
                bin[j] = t;
        }
 }
 
-int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
+int gdb_get_registers_packet(struct connection *connection, struct target *target, char* packet, int packet_size)
 {
-       reg_t **reg_list;
+       struct reg **reg_list;
        int reg_list_size;
        int retval;
        int reg_packet_size = 0;
@@ -957,25 +940,25 @@ int gdb_get_registers_packet(connection_t *connection, target_t *target, char* p
                reg_packet_size += reg_list[i]->size;
        }
 
-       reg_packet = malloc(CEIL(reg_packet_size, 8) * 2);
+       reg_packet = malloc(DIV_ROUND_UP(reg_packet_size, 8) * 2);
        reg_packet_p = reg_packet;
 
        for (i = 0; i < reg_list_size; i++)
        {
                gdb_str_to_target(target, reg_packet_p, reg_list[i]);
-               reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
+               reg_packet_p += DIV_ROUND_UP(reg_list[i]->size, 8) * 2;
        }
 
 #ifdef _DEBUG_GDB_IO_
        {
                char *reg_packet_p;
-               reg_packet_p = strndup(reg_packet, CEIL(reg_packet_size, 8) * 2);
+               reg_packet_p = strndup(reg_packet, DIV_ROUND_UP(reg_packet_size, 8) * 2);
                LOG_DEBUG("reg_packet: %s", reg_packet_p);
                free(reg_packet_p);
        }
 #endif
 
-       gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2);
+       gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_packet_size, 8) * 2);
        free(reg_packet);
 
        free(reg_list);
@@ -983,10 +966,10 @@ int gdb_get_registers_packet(connection_t *connection, target_t *target, char* p
        return ERROR_OK;
 }
 
-int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_set_registers_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        int i;
-       reg_t **reg_list;
+       struct reg **reg_list;
        int reg_list_size;
        int retval;
        char *packet_p;
@@ -1013,22 +996,18 @@ int gdb_set_registers_packet(connection_t *connection, target_t *target, char *p
        packet_p = packet;
        for (i = 0; i < reg_list_size; i++)
        {
-               u8 *bin_buf;
-               int chars = (CEIL(reg_list[i]->size, 8) * 2);
+               uint8_t *bin_buf;
+               int chars = (DIV_ROUND_UP(reg_list[i]->size, 8) * 2);
 
                if (packet_p + chars > packet + packet_size)
                {
                        LOG_ERROR("BUG: register packet is too small for registers");
                }
 
-               reg_arch_type_t *arch_type;
-               bin_buf = malloc(CEIL(reg_list[i]->size, 8));
+               bin_buf = malloc(DIV_ROUND_UP(reg_list[i]->size, 8));
                gdb_target_to_reg(target, packet_p, chars, bin_buf);
 
-               /* get register arch_type, and call set method */
-               arch_type = register_get_arch_type(reg_list[i]->arch_type);
-
-               arch_type->set(reg_list[i], bin_buf);
+               reg_list[i]->type->set(reg_list[i], bin_buf);
 
                /* advance packet pointer */
                packet_p += chars;
@@ -1037,7 +1016,7 @@ int gdb_set_registers_packet(connection_t *connection, target_t *target, char *p
                free(bin_buf);
        }
 
-       /* free reg_t *reg_list[] array allocated by get_gdb_reg_list */
+       /* free struct reg *reg_list[] array allocated by get_gdb_reg_list */
        free(reg_list);
 
        gdb_put_packet(connection, "OK", 2);
@@ -1045,11 +1024,11 @@ int gdb_set_registers_packet(connection_t *connection, target_t *target, char *p
        return ERROR_OK;
 }
 
-int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_get_register_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        char *reg_packet;
        int reg_num = strtoul(packet + 1, NULL, 16);
-       reg_t **reg_list;
+       struct reg **reg_list;
        int reg_list_size;
        int retval;
 
@@ -1068,11 +1047,11 @@ int gdb_get_register_packet(connection_t *connection, target_t *target, char *pa
                exit(-1);
        }
 
-       reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
+       reg_packet = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
 
        gdb_str_to_target(target, reg_packet, reg_list[reg_num]);
 
-       gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);
+       gdb_put_packet(connection, reg_packet, DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
 
        free(reg_list);
        free(reg_packet);
@@ -1080,15 +1059,14 @@ int gdb_get_register_packet(connection_t *connection, target_t *target, char *pa
        return ERROR_OK;
 }
 
-int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_set_register_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        char *separator;
-       u8 *bin_buf;
+       uint8_t *bin_buf;
        int reg_num = strtoul(packet + 1, &separator, 16);
-       reg_t **reg_list;
+       struct reg **reg_list;
        int reg_list_size;
        int retval;
-       reg_arch_type_t *arch_type;
 
        LOG_DEBUG("-");
 
@@ -1110,16 +1088,14 @@ int gdb_set_register_packet(connection_t *connection, target_t *target, char *pa
        }
 
        /* convert from GDB-string (target-endian) to hex-string (big-endian) */
-       bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8));
-       int chars = (CEIL(reg_list[reg_num]->size, 8) * 2);
+       bin_buf = malloc(DIV_ROUND_UP(reg_list[reg_num]->size, 8));
+       int chars = (DIV_ROUND_UP(reg_list[reg_num]->size, 8) * 2);
 
        /* fix!!! add some sanity checks on packet size here */
 
        gdb_target_to_reg(target, separator + 1, chars, bin_buf);
 
-               /* get register arch_type, and call set method */
-       arch_type = register_get_arch_type(reg_list[reg_num]->arch_type);
-       arch_type->set(reg_list[reg_num], bin_buf);
+       reg_list[reg_num]->type->set(reg_list[reg_num], bin_buf);
 
        gdb_put_packet(connection, "OK", 2);
 
@@ -1129,7 +1105,7 @@ int gdb_set_register_packet(connection_t *connection, target_t *target, char *pa
        return ERROR_OK;
 }
 
-int gdb_error(connection_t *connection, int retval)
+int gdb_error(struct connection *connection, int retval)
 {
        switch (retval)
        {
@@ -1160,13 +1136,13 @@ int gdb_error(connection_t *connection, int retval)
  *
  * 8191 bytes by the looks of it. Why 8191 bytes instead of 8192?????
  */
-int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_read_memory_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        char *separator;
-       u32 addr = 0;
-       u32 len = 0;
+       uint32_t addr = 0;
+       uint32_t len = 0;
 
-       u8 *buffer;
+       uint8_t *buffer;
        char *hex_buffer;
 
        int retval = ERROR_OK;
@@ -1182,15 +1158,15 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac
                return ERROR_SERVER_REMOTE_CLOSED;
        }
 
-       len = strtoul(separator+1, NULL, 16);
+       len = strtoul(separator + 1, NULL, 16);
 
        buffer = malloc(len);
 
-       LOG_DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
+       LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
 
        retval = target_read_buffer(target, addr, len, buffer);
 
-       if ((retval!=ERROR_OK)&&!gdb_report_data_abort)
+       if ((retval != ERROR_OK)&&!gdb_report_data_abort)
        {
                /* TODO : Here we have to lie and send back all zero's lest stack traces won't work.
                 * At some point this might be fixed in GDB, in which case this code can be removed.
@@ -1199,7 +1175,7 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac
                 * gained by involving the user in this problem that hopefully will get resolved
                 * eventually
                 *
-                * http://sourceware.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gdb&pr=2395
+                * http://sourceware.org/cgi-bin/gnatsweb.pl?cmd = view%20audit-trail&database = gdb&pr = 2395
                 *
                 * For now, the default is to fix up things to make current GDB versions work.
                 * This can be overwritten using the gdb_report_data_abort <'enable'|'disable'> command.
@@ -1212,10 +1188,10 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac
        {
                hex_buffer = malloc(len * 2 + 1);
 
-               u32 i;
+               uint32_t i;
                for (i = 0; i < len; i++)
                {
-                       u8 t = buffer[i];
+                       uint8_t t = buffer[i];
                        hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
                        hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
                }
@@ -1234,15 +1210,15 @@ int gdb_read_memory_packet(connection_t *connection, target_t *target, char *pac
        return retval;
 }
 
-int gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_write_memory_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        char *separator;
-       u32 addr = 0;
-       u32 len = 0;
+       uint32_t addr = 0;
+       uint32_t len = 0;
 
-       u8 *buffer;
+       uint8_t *buffer;
 
-       u32 i;
+       uint32_t i;
        int retval;
 
        /* skip command character */
@@ -1256,7 +1232,7 @@ int gdb_write_memory_packet(connection_t *connection, target_t *target, char *pa
                return ERROR_SERVER_REMOTE_CLOSED;
        }
 
-       len = strtoul(separator+1, &separator, 16);
+       len = strtoul(separator + 1, &separator, 16);
 
        if (*(separator++) != ':')
        {
@@ -1266,12 +1242,12 @@ int gdb_write_memory_packet(connection_t *connection, target_t *target, char *pa
 
        buffer = malloc(len);
 
-       LOG_DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
+       LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
 
-       for (i=0; i<len; i++)
+       for (i = 0; i < len; i++)
        {
-               u32 tmp;
-               sscanf(separator + 2*i, "%2x", &tmp);
+               uint32_t tmp;
+               sscanf(separator + 2*i, "%2" SCNx32 , &tmp);
                buffer[i] = tmp;
        }
 
@@ -1291,11 +1267,11 @@ int gdb_write_memory_packet(connection_t *connection, target_t *target, char *pa
        return retval;
 }
 
-int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_write_memory_binary_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        char *separator;
-       u32 addr = 0;
-       u32 len = 0;
+       uint32_t addr = 0;
+       uint32_t len = 0;
 
        int retval;
 
@@ -1310,7 +1286,7 @@ int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, c
                return ERROR_SERVER_REMOTE_CLOSED;
        }
 
-       len = strtoul(separator+1, &separator, 16);
+       len = strtoul(separator + 1, &separator, 16);
 
        if (*(separator++) != ':')
        {
@@ -1321,9 +1297,9 @@ int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, c
        retval = ERROR_OK;
        if (len)
        {
-               LOG_DEBUG("addr: 0x%8.8x, len: 0x%8.8x", addr, len);
+               LOG_DEBUG("addr: 0x%8.8" PRIx32 ", len: 0x%8.8" PRIx32 "", addr, len);
 
-               retval = target_write_buffer(target, addr, len, (u8*)separator);
+               retval = target_write_buffer(target, addr, len, (uint8_t*)separator);
        }
 
        if (retval == ERROR_OK)
@@ -1339,11 +1315,11 @@ int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, c
        return ERROR_OK;
 }
 
-int gdb_step_continue_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_step_continue_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        int current = 0;
-       u32 address = 0x0;
-       int retval=ERROR_OK;
+       uint32_t address = 0x0;
+       int retval = ERROR_OK;
 
        LOG_DEBUG("-");
 
@@ -1360,8 +1336,8 @@ int gdb_step_continue_packet(connection_t *connection, target_t *target, char *p
        if (packet[0] == 'c')
        {
                LOG_DEBUG("continue");
-               target_handle_event( target, TARGET_EVENT_OLD_pre_resume );
-               retval=target_resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
+               target_handle_event(target, TARGET_EVENT_OLD_pre_resume);
+               retval = target_resume(target, current, address, 0, 0); /* resume at current address, don't handle breakpoints, not debugging */
        }
        else if (packet[0] == 's')
        {
@@ -1372,13 +1348,13 @@ int gdb_step_continue_packet(connection_t *connection, target_t *target, char *p
        return retval;
 }
 
-int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_breakpoint_watchpoint_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
        int type;
        enum breakpoint_type bp_type = BKPT_SOFT /* dummy init to avoid warning */;
        enum watchpoint_rw wp_type;
-       u32 address;
-       u32 size;
+       uint32_t address;
+       uint32_t size;
        char *separator;
        int retval;
 
@@ -1397,9 +1373,9 @@ int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target,
        else if (type == 4) /* access watchpoint */
                wp_type = WPT_ACCESS;
 
-       if (gdb_breakpoint_override&&((bp_type==BKPT_SOFT)||(bp_type==BKPT_HARD)))
+       if (gdb_breakpoint_override && ((bp_type == BKPT_SOFT)||(bp_type == BKPT_HARD)))
        {
-               bp_type=gdb_breakpoint_override_type;
+               bp_type = gdb_breakpoint_override_type;
        }
 
        if (*separator != ',')
@@ -1408,7 +1384,7 @@ int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target,
                return ERROR_SERVER_REMOTE_CLOSED;
        }
 
-       address = strtoul(separator+1, &separator, 16);
+       address = strtoul(separator + 1, &separator, 16);
 
        if (*separator != ',')
        {
@@ -1416,7 +1392,7 @@ int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target,
                return ERROR_SERVER_REMOTE_CLOSED;
        }
 
-       size = strtoul(separator+1, &separator, 16);
+       size = strtoul(separator + 1, &separator, 16);
 
        switch (type)
        {
@@ -1533,19 +1509,19 @@ static int decode_xfer_read(char *buf, char **annex, int *ofs, unsigned int *len
        if (*separator != ',')
                return -1;
 
-       *len = strtoul(separator+1, NULL, 16);
+       *len = strtoul(separator + 1, NULL, 16);
 
        return 0;
 }
 
-int gdb_calc_blocksize(flash_bank_t *bank)
+int gdb_calc_blocksize(struct flash_bank *bank)
 {
-       u32 i;
-       u32 block_size = 0xffffffff;
+       uint32_t i;
+       uint32_t block_size = 0xffffffff;
 
        /* loop through all sectors and return smallest sector size */
 
-       for (i = 0; i < (u32)bank->num_sectors; i++)
+       for (i = 0; i < (uint32_t)bank->num_sectors; i++)
        {
                if (bank->sectors[i].size < block_size)
                        block_size = bank->sectors[i].size;
@@ -1556,14 +1532,14 @@ int gdb_calc_blocksize(flash_bank_t *bank)
 
 static int compare_bank (const void * a, const void * b)
 {
-       flash_bank_t *b1, *b2;
-       b1=*((flash_bank_t **)a);
-       b2=*((flash_bank_t **)b);
+       struct flash_bank *b1, *b2;
+       b1=*((struct flash_bank **)a);
+       b2=*((struct flash_bank **)b);
 
-       if (b1->base==b2->base)
+       if (b1->base == b2->base)
        {
                return 0;
-       } else if (b1->base>b2->base)
+       } else if (b1->base > b2->base)
        {
                return 1;
        } else
@@ -1572,10 +1548,10 @@ static int compare_bank (const void * a, const void * b)
        }
 }
 
-int gdb_query_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_query_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
-       command_context_t *cmd_ctx = connection->cmd_ctx;
-       gdb_connection_t *gdb_connection = connection->priv;
+       struct command_context *cmd_ctx = connection->cmd_ctx;
+       struct gdb_connection *gdb_connection = connection->priv;
 
        if (strstr(packet, "qRcmd,"))
        {
@@ -1584,10 +1560,10 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                        char *cmd;
                        int i;
                        cmd = malloc((packet_size - 6)/2 + 1);
-                       for (i=0; i < (packet_size - 6)/2; i++)
+                       for (i = 0; i < (packet_size - 6)/2; i++)
                        {
-                               u32 tmp;
-                               sscanf(packet + 6 + 2*i, "%2x", &tmp);
+                               uint32_t tmp;
+                               sscanf(packet + 6 + 2*i, "%2" SCNx32 , &tmp);
                                cmd[i] = tmp;
                        }
                        cmd[(packet_size - 6)/2] = 0x0;
@@ -1595,7 +1571,11 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                        /* We want to print all debug output to GDB connection */
                        log_add_callback(gdb_log_callback, connection);
                        target_call_timer_callbacks_now();
+                       /* some commands need to know the GDB connection, make note of current
+                        * GDB connection. */
+                       current_gdb_connection = gdb_connection;
                        command_run_line(cmd_ctx, cmd);
+                       current_gdb_connection = NULL;
                        target_call_timer_callbacks_now();
                        log_remove_callback(gdb_log_callback, connection);
                        free(cmd);
@@ -1610,9 +1590,9 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                        int retval;
                        char gdb_reply[10];
                        char *separator;
-                       u32 checksum;
-                       u32 addr = 0;
-                       u32 len = 0;
+                       uint32_t checksum;
+                       uint32_t addr = 0;
+                       uint32_t len = 0;
 
                        /* skip command character */
                        packet += 5;
@@ -1631,7 +1611,7 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
 
                        if (retval == ERROR_OK)
                        {
-                               snprintf(gdb_reply, 10, "C%8.8x", checksum);
+                               snprintf(gdb_reply, 10, "C%8.8" PRIx32 "", checksum);
                                gdb_put_packet(connection, gdb_reply, 9);
                        }
                        else
@@ -1654,7 +1634,7 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
 
                xml_printf(&retval, &buffer, &pos, &size,
                                "PacketSize=%x;qXfer:memory-map:read%c;qXfer:features:read-;QStartNoAckMode+",
-                               (GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1)&&(flash_get_bank_count()>0)) ? '+' : '-');
+                               (GDB_BUFFER_SIZE - 1), ((gdb_use_memory_map == 1) && (flash_get_bank_count() > 0)) ? '+' : '-');
 
                if (retval != ERROR_OK)
                {
@@ -1667,7 +1647,7 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
 
                return ERROR_OK;
        }
-       else if (strstr(packet, "qXfer:memory-map:read::")&&(flash_get_bank_count()>0))
+       else if (strstr(packet, "qXfer:memory-map:read::") && (flash_get_bank_count() > 0))
        {
                /* We get away with only specifying flash here. Regions that are not
                 * specified are treated as if we provided no memory map(if not we
@@ -1675,7 +1655,7 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                 * Normally we only execute this code once, but no big deal if we
                 * have to regenerate it a couple of times. */
 
-               flash_bank_t *p;
+               struct flash_bank *p;
                char *xml = NULL;
                int size = 0;
                int pos = 0;
@@ -1699,10 +1679,10 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                read/write) by default for GDB.
                GDB does not have a concept of non-cacheable read/write memory.
                 */
-               flash_bank_t **banks=malloc(sizeof(flash_bank_t *)*flash_get_bank_count());
+               struct flash_bank **banks = malloc(sizeof(struct flash_bank *)*flash_get_bank_count());
                int i;
 
-               for (i=0; i<flash_get_bank_count(); i++)
+               for (i = 0; i < flash_get_bank_count(); i++)
                {
                        p = get_flash_bank_by_num(i);
                        if (p == NULL)
@@ -1715,14 +1695,14 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                        banks[i]=p;
                }
 
-               qsort(banks, flash_get_bank_count(), sizeof(flash_bank_t *), compare_bank);
+               qsort(banks, flash_get_bank_count(), sizeof(struct flash_bank *), compare_bank);
 
-               u32 ram_start=0;
-               for (i=0; i<flash_get_bank_count(); i++)
+               uint32_t ram_start = 0;
+               for (i = 0; i < flash_get_bank_count(); i++)
                {
                        p = banks[i];
 
-                       if (ram_start<p->base)
+                       if (ram_start < p->base)
                        {
                                xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
                                        ram_start, p->base-ram_start);
@@ -1736,9 +1716,9 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                                "<property name=\"blocksize\">0x%x</property>\n" \
                                "</memory>\n", \
                                p->base, p->size, blocksize);
-                       ram_start=p->base+p->size;
+                       ram_start = p->base + p->size;
                }
-               if (ram_start!=0)
+               if (ram_start != 0)
                {
                        xml_printf(&retval, &xml, &pos, &size, "<memory type=\"ram\" start=\"0x%x\" length=\"0x%x\"/>\n",
                                ram_start, 0-ram_start);
@@ -1800,7 +1780,7 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
                }
 
                xml_printf(&retval, &xml, &pos, &size, \
-                       "l<target version=\"1.0\">\n<architecture>arm</architecture>\n</target>\n");
+                       "l < target version=\"1.0\">\n < architecture > arm</architecture>\n</target>\n");
 
                if (retval != ERROR_OK)
                {
@@ -1824,10 +1804,10 @@ int gdb_query_packet(connection_t *connection, target_t *target, char *packet, i
        return ERROR_OK;
 }
 
-int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_v_packet(struct connection *connection, struct target *target, char *packet, int packet_size)
 {
-       gdb_connection_t *gdb_connection = connection->priv;
-       gdb_service_t *gdb_service = connection->service->priv;
+       struct gdb_connection *gdb_connection = connection->priv;
+       struct gdb_service *gdb_service = connection->service->priv;
        int result;
 
        /* if flash programming disabled - send a empty reply */
@@ -1872,7 +1852,7 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p
 
                /* perform any target specific operations before the erase */
                target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_ERASE_START);
-               result = flash_erase_address_range(gdb_service->target, addr, length );
+               result = flash_erase_address_range(gdb_service->target, addr, length);
                target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_ERASE_END);
 
                /* perform erase */
@@ -1913,12 +1893,12 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p
                /* create a new image if there isn't already one */
                if (gdb_connection->vflash_image == NULL)
                {
-                       gdb_connection->vflash_image = malloc(sizeof(image_t));
+                       gdb_connection->vflash_image = malloc(sizeof(struct image));
                        image_open(gdb_connection->vflash_image, "", "build");
                }
 
                /* create new section with content from packet buffer */
-               if((retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (u8*)parse)) != ERROR_OK)
+               if ((retval = image_add_section(gdb_connection->vflash_image, addr, length, 0x0, (uint8_t*)parse)) != ERROR_OK)
                {
                        return retval;
                }
@@ -1930,14 +1910,14 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p
 
        if (!strcmp(packet, "vFlashDone"))
        {
-               u32 written;
+               uint32_t written;
 
                /* process the flashing buffer. No need to erase as GDB
                 * always issues a vFlashErase first. */
                target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_START);
                result = flash_write(gdb_service->target, gdb_connection->vflash_image, &written, 0);
                target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_FLASH_WRITE_END);
-               if ( result != ERROR_OK)
+               if (result != ERROR_OK)
                {
                        if (result == ERROR_FLASH_DST_OUT_OF_BANK)
                                gdb_put_packet(connection, "E.memtype", 9);
@@ -1946,7 +1926,7 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p
                        }
                else
                {
-                       LOG_DEBUG("wrote %u bytes from vFlash image to flash", written);
+                       LOG_DEBUG("wrote %u bytes from vFlash image to flash", (unsigned)written);
                        gdb_put_packet(connection, "OK", 2);
                }
 
@@ -1961,38 +1941,20 @@ int gdb_v_packet(connection_t *connection, target_t *target, char *packet, int p
        return ERROR_OK;
 }
 
-int gdb_detach(connection_t *connection, target_t *target)
+int gdb_detach(struct connection *connection, struct target *target)
 {
+       struct gdb_service *gdb_service = connection->service->priv;
 
-       switch( detach_mode )
-       {
-               case GDB_DETACH_RESUME:
-                       target_handle_event( target, TARGET_EVENT_OLD_pre_resume );
-                       target_resume(target, 1, 0, 1, 0);
-                       break;
+       target_call_event_callbacks(gdb_service->target, TARGET_EVENT_GDB_DETACH);
 
-               case GDB_DETACH_RESET:
-                       /* FIX?? make this configurable?? */
-                       target_process_reset(connection->cmd_ctx, RESET_HALT);
-                       break;
-
-               case GDB_DETACH_HALT:
-                       target_halt(target);
-                       break;
-
-               case GDB_DETACH_NOTHING:
-                       break;
-       }
-
-       gdb_put_packet(connection, "OK", 2);
-       return ERROR_OK;
+       return gdb_put_packet(connection, "OK", 2);
 }
 
-static void gdb_log_callback(void *priv, const char *file, int line,
+static void gdb_log_callback(void *priv, const char *file, unsigned line,
                const char *function, const char *string)
 {
-       connection_t *connection = priv;
-       gdb_connection_t *gdb_con = connection->priv;
+       struct connection *connection = priv;
+       struct gdb_connection *gdb_con = connection->priv;
 
        if (gdb_con->busy)
        {
@@ -2006,7 +1968,7 @@ static void gdb_log_callback(void *priv, const char *file, int line,
 /* Do not allocate this on the stack */
 char gdb_packet_buffer[GDB_BUFFER_SIZE];
 
-static void gdb_sig_halted(connection_t *connection)
+static void gdb_sig_halted(struct connection *connection)
 {
        char sig_reply[4];
        snprintf(sig_reply, 4, "T%2.2x", 2);
@@ -2014,14 +1976,14 @@ static void gdb_sig_halted(connection_t *connection)
 
 }
 
-int gdb_input_inner(connection_t *connection)
+int gdb_input_inner(struct connection *connection)
 {
-       gdb_service_t *gdb_service = connection->service->priv;
-       target_t *target = gdb_service->target;
-       char *packet=gdb_packet_buffer;
+       struct gdb_service *gdb_service = connection->service->priv;
+       struct target *target = gdb_service->target;
+       char *packet = gdb_packet_buffer;
        int packet_size;
        int retval;
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        static int extended_protocol = 0;
 
        /* drain input buffer */
@@ -2036,18 +1998,18 @@ int gdb_input_inner(connection_t *connection)
                /* terminate with zero */
                packet[packet_size] = 0;
 
-               if( LOG_LEVEL_IS( LOG_LVL_DEBUG ) ){
-                       if( packet[0] == 'X' ){
+               if (LOG_LEVEL_IS(LOG_LVL_DEBUG)) {
+                       if (packet[0] == 'X') {
                                // binary packets spew junk into the debug log stream
                                char buf[ 50 ];
                                int x;
-                               for( x = 0 ; (x < 49) && (packet[x] != ':') ; x++ ){
+                               for (x = 0 ; (x < 49) && (packet[x] != ':') ; x++) {
                                        buf[x] = packet[x];
                                }
                                buf[x] = 0;
-                               LOG_DEBUG("received packet: '%s:<binary-data>'", buf );
+                               LOG_DEBUG("received packet: '%s:<binary-data>'", buf);
                        } else {
-                               LOG_DEBUG("received packet: '%s'", packet );
+                               LOG_DEBUG("received packet: '%s'", packet);
                        }
                }
 
@@ -2093,23 +2055,55 @@ int gdb_input_inner(connection_t *connection)
                                case 'c':
                                case 's':
                                        {
-                                               if (target->state != TARGET_HALTED)
+                                               int retval = ERROR_OK;
+
+                                               struct gdb_connection *gdb_con = connection->priv;
+                                               log_add_callback(gdb_log_callback, connection);
+
+                                               bool nostep = false;
+                                               if (target->state == TARGET_RUNNING)
+                                               {
+                                                       LOG_WARNING("The target is already running. Halt target before stepi/continue.");
+                                                       retval = target_halt(target);
+                                                       if (retval == ERROR_OK)
+                                                               retval = target_wait_state(target, TARGET_HALTED, 100);
+                                               } else if (target->state != TARGET_HALTED)
+                                               {
+                                                       LOG_WARNING("The target is not in the halted nor running stated, stepi/continue ignored.");
+                                                       nostep = true;
+                                               } else if ((packet[0] == 's') && gdb_con->sync)
+                                               {
+                                                       /* Hmm..... when you issue a continue in GDB, then a "stepi" is
+                                                        * sent by GDB first to OpenOCD, thus defeating the check to
+                                                        * make only the single stepping have the sync feature...
+                                                        */
+                                                       nostep = true;
+                                                       LOG_WARNING("stepi ignored. GDB will now fetch the register state from the target.");
+                                               }
+                                               gdb_con->sync = false;
+
+                                               if ((retval!=ERROR_OK) || nostep)
                                                {
-                                                       /* If the target isn't in the halted state, then we can't
+                                                       /* Either the target isn't in the halted state, then we can't
                                                         * step/continue. This might be early setup, etc.
+                                                        *
+                                                        * Or we want to allow GDB to pick up a fresh set of
+                                                        * register values without modifying the target state.
+                                                        *
                                                         */
                                                        gdb_sig_halted(connection);
+
+                                                       /* stop forwarding log packets! */
+                                                       log_remove_callback(gdb_log_callback, connection);
                                                } else
                                                {
                                                        /* We're running/stepping, in which case we can
                                                         * forward log output until the target is halted
                                                         */
-                                                       gdb_connection_t *gdb_con = connection->priv;
                                                        gdb_con->frontend_state = TARGET_RUNNING;
-                                                       log_add_callback(gdb_log_callback, connection);
                                                        target_call_event_callbacks(target, TARGET_EVENT_GDB_START);
-                                                       int retval=gdb_step_continue_packet(connection, target, packet, packet_size);
-                                                       if (retval!=ERROR_OK)
+                                                       int retval = gdb_step_continue_packet(connection, target, packet, packet_size);
+                                                       if (retval != ERROR_OK)
                                                        {
                                                                /* we'll never receive a halted condition... issue a false one.. */
                                                                gdb_frontend_halted(target, connection);
@@ -2142,7 +2136,9 @@ int gdb_input_inner(connection_t *connection)
                                        /* handle extended restart packet */
                                        breakpoint_clear_target(gdb_service->target);
                                        watchpoint_clear_target(gdb_service->target);
-                                       command_run_linef(connection->cmd_ctx, "ocd_gdb_restart %d", get_num_by_target(target));
+                                       command_run_linef(connection->cmd_ctx,
+                                                       "ocd_gdb_restart %s",
+                                                       target->cmd_name);
                                        break;
                                default:
                                        /* ignore unkown packets */
@@ -2160,8 +2156,16 @@ int gdb_input_inner(connection_t *connection)
                {
                        if (target->state == TARGET_RUNNING)
                        {
-                               target_halt(target);
+                               retval = target_halt(target);
+                               if (retval != ERROR_OK)
+                               {
+                                       target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
+                               }
                                gdb_con->ctrl_c = 0;
+                       } else
+                       {
+                               LOG_INFO("The target is not running when halt was requested, stopping GDB.");
+                               target_call_event_callbacks(target, TARGET_EVENT_GDB_HALT);
                        }
                }
 
@@ -2170,10 +2174,10 @@ int gdb_input_inner(connection_t *connection)
        return ERROR_OK;
 }
 
-int gdb_input(connection_t *connection)
+int gdb_input(struct connection *connection)
 {
        int retval = gdb_input_inner(connection);
-       gdb_connection_t *gdb_con = connection->priv;
+       struct gdb_connection *gdb_con = connection->priv;
        if (retval == ERROR_SERVER_REMOTE_CLOSED)
                return retval;
 
@@ -2187,8 +2191,8 @@ int gdb_input(connection_t *connection)
 
 int gdb_init(void)
 {
-       gdb_service_t *gdb_service;
-       target_t *target = all_targets;
+       struct gdb_service *gdb_service;
+       struct target *target = all_targets;
 
        if (!target)
        {
@@ -2198,15 +2202,15 @@ int gdb_init(void)
 
        if (gdb_port == 0 && server_use_pipes == 0)
        {
-               LOG_DEBUG("no gdb port specified, using default port 3333");
-               gdb_port = 3333;
+               LOG_INFO("gdb port disabled");
+               return ERROR_OK;
        }
 
        if (server_use_pipes)
        {
                /* only a single gdb connection when using a pipe */
 
-               gdb_service = malloc(sizeof(gdb_service_t));
+               gdb_service = malloc(sizeof(struct gdb_service));
                gdb_service->target = target;
 
                add_service("gdb", CONNECTION_PIPE, 0, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service);
@@ -2216,149 +2220,133 @@ int gdb_init(void)
        }
        else
        {
+               unsigned short port = gdb_port;
+
                while (target)
                {
-                       gdb_service = malloc(sizeof(gdb_service_t));
+                       gdb_service = malloc(sizeof(struct gdb_service));
                        gdb_service->target = target;
 
-                       add_service("gdb", CONNECTION_TCP, gdb_port + target->target_number, 1, gdb_new_connection, gdb_input, gdb_connection_closed, gdb_service);
+                       add_service("gdb", CONNECTION_TCP,
+                                       port, 1,
+                                       gdb_new_connection, gdb_input,
+                                       gdb_connection_closed, gdb_service);
 
-                       LOG_DEBUG("gdb service for target %s at port %i",
+                       LOG_DEBUG("gdb service for target %s at TCP port %i",
                                        target_get_name(target),
-                                       gdb_port + target->target_number);
+                                       port);
                        target = target->next;
+                       port++;
                }
        }
 
        return ERROR_OK;
 }
 
-/* daemon configuration command gdb_port */
-int handle_gdb_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+COMMAND_HANDLER(handle_gdb_sync_command)
 {
-       if (argc == 0)
+       if (CMD_ARGC != 0)
        {
-               command_print(cmd_ctx, "%d", gdb_port);
-               return ERROR_OK;
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+
+       if (current_gdb_connection == NULL)
+       {
+               command_print(CMD_CTX,
+                               "gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
+               return ERROR_FAIL;
        }
 
-       /* only if the port wasn't overwritten by cmdline */
-       if (gdb_port == 0)
-               gdb_port = strtoul(args[0], NULL, 0);
+       current_gdb_connection->sync = true;
 
        return ERROR_OK;
 }
 
-int handle_gdb_detach_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+/* daemon configuration command gdb_port */
+COMMAND_HANDLER(handle_gdb_port_command)
 {
-       if (argc == 1)
-       {
-               if (strcmp(args[0], "resume") == 0)
-               {
-                       detach_mode = GDB_DETACH_RESUME;
-                       return ERROR_OK;
-               }
-               else if (strcmp(args[0], "reset") == 0)
-               {
-                       detach_mode = GDB_DETACH_RESET;
-                       return ERROR_OK;
-               }
-               else if (strcmp(args[0], "halt") == 0)
-               {
-                       detach_mode = GDB_DETACH_HALT;
-                       return ERROR_OK;
-               }
-               else if (strcmp(args[0], "nothing") == 0)
-               {
-                       detach_mode = GDB_DETACH_NOTHING;
-                       return ERROR_OK;
-               }
-               else
-                       LOG_WARNING("invalid gdb_detach configuration directive: %s", args[0]);
-       }
-
-       return ERROR_COMMAND_SYNTAX_ERROR;
+       return CALL_COMMAND_HANDLER(server_port_command, &gdb_port);
 }
 
-int handle_gdb_memory_map_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+COMMAND_HANDLER(handle_gdb_memory_map_command)
 {
-       if (argc == 1)
+       if (CMD_ARGC == 1)
        {
-               if (strcmp(args[0], "enable") == 0)
+               if (strcmp(CMD_ARGV[0], "enable") == 0)
                {
                        gdb_use_memory_map = 1;
                        return ERROR_OK;
                }
-               else if (strcmp(args[0], "disable") == 0)
+               else if (strcmp(CMD_ARGV[0], "disable") == 0)
                {
                        gdb_use_memory_map = 0;
                        return ERROR_OK;
                }
                else
-                       LOG_WARNING("invalid gdb_memory_map configuration directive %s", args[0]);
+                       LOG_WARNING("invalid gdb_memory_map configuration directive %s", CMD_ARGV[0]);
        }
 
        return ERROR_COMMAND_SYNTAX_ERROR;
 }
 
-int handle_gdb_flash_program_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+COMMAND_HANDLER(handle_gdb_flash_program_command)
 {
-       if (argc == 1)
+       if (CMD_ARGC == 1)
        {
-               if (strcmp(args[0], "enable") == 0)
+               if (strcmp(CMD_ARGV[0], "enable") == 0)
                {
                        gdb_flash_program = 1;
                        return ERROR_OK;
                }
-               else if (strcmp(args[0], "disable") == 0)
+               else if (strcmp(CMD_ARGV[0], "disable") == 0)
                {
                        gdb_flash_program = 0;
                        return ERROR_OK;
                }
                else
-                       LOG_WARNING("invalid gdb_flash_program configuration directive: %s", args[0]);
+                       LOG_WARNING("invalid gdb_flash_program configuration directive: %s", CMD_ARGV[0]);
        }
 
        return ERROR_COMMAND_SYNTAX_ERROR;
 }
 
-int handle_gdb_report_data_abort_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+COMMAND_HANDLER(handle_gdb_report_data_abort_command)
 {
-       if (argc == 1)
+       if (CMD_ARGC == 1)
        {
-               if (strcmp(args[0], "enable") == 0)
+               if (strcmp(CMD_ARGV[0], "enable") == 0)
                {
                        gdb_report_data_abort = 1;
                        return ERROR_OK;
                }
-               else if (strcmp(args[0], "disable") == 0)
+               else if (strcmp(CMD_ARGV[0], "disable") == 0)
                {
                        gdb_report_data_abort = 0;
                        return ERROR_OK;
                }
                else
-                       LOG_WARNING("invalid gdb_report_data_abort configuration directive: %s", args[0]);
+                       LOG_WARNING("invalid gdb_report_data_abort configuration directive: %s", CMD_ARGV[0]);
        }
 
        return ERROR_COMMAND_SYNTAX_ERROR;
 }
 
 /* gdb_breakpoint_override */
-int handle_gdb_breakpoint_override_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+COMMAND_HANDLER(handle_gdb_breakpoint_override_command)
 {
-       if (argc == 0)
+       if (CMD_ARGC == 0)
        {
 
-       } else if (argc==1)
+       } else if (CMD_ARGC == 1)
        {
                gdb_breakpoint_override = 1;
-               if (strcmp(args[0], "hard")==0)
+               if (strcmp(CMD_ARGV[0], "hard") == 0)
                {
-                       gdb_breakpoint_override_type=BKPT_HARD;
-               } else if (strcmp(args[0], "soft")==0)
+                       gdb_breakpoint_override_type = BKPT_HARD;
+               } else if (strcmp(CMD_ARGV[0], "soft") == 0)
                {
-                       gdb_breakpoint_override_type=BKPT_SOFT;
-               } else if (strcmp(args[0], "disable") == 0)
+                       gdb_breakpoint_override_type = BKPT_SOFT;
+               } else if (strcmp(CMD_ARGV[0], "disable") == 0)
                {
                        gdb_breakpoint_override = 0;
                }
@@ -2368,7 +2356,7 @@ int handle_gdb_breakpoint_override_command(struct command_context_s *cmd_ctx, ch
        }
        if (gdb_breakpoint_override)
        {
-               LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type==BKPT_HARD)?"hard":"soft");
+               LOG_USER("force %s breakpoints", (gdb_breakpoint_override_type == BKPT_HARD)?"hard":"soft");
        } else
        {
                LOG_USER("breakpoint type is not overriden");
@@ -2377,20 +2365,27 @@ int handle_gdb_breakpoint_override_command(struct command_context_s *cmd_ctx, ch
        return ERROR_OK;
 }
 
-int gdb_register_commands(command_context_t *command_context)
+int gdb_register_commands(struct command_context *command_context)
 {
-       register_command(command_context, NULL, "gdb_port", handle_gdb_port_command,
-                       COMMAND_ANY, "daemon configuration command gdb_port");
-       register_command(command_context, NULL, "gdb_detach", handle_gdb_detach_command,
-                       COMMAND_CONFIG, "resume/reset/halt/nothing - "
-                       "specify behavior when GDB detaches from the target");
-       register_command(command_context, NULL, "gdb_memory_map", handle_gdb_memory_map_command,
-                       COMMAND_CONFIG, "enable or disable memory map");
-       register_command(command_context, NULL, "gdb_flash_program", handle_gdb_flash_program_command,
-                       COMMAND_CONFIG, "enable or disable flash program");
-       register_command(command_context, NULL, "gdb_report_data_abort", handle_gdb_report_data_abort_command,
-                       COMMAND_CONFIG, "enable or disable reporting data aborts");
-       register_command(command_context, NULL, "gdb_breakpoint_override", handle_gdb_breakpoint_override_command,
-                       COMMAND_EXEC, "hard/soft/disable - force breakpoint type for gdb 'break' commands.");
+       register_command(command_context, NULL, "gdb_sync",
+                       handle_gdb_sync_command, COMMAND_ANY,
+                       "next stepi will return immediately allowing GDB to "
+                       "fetch register state without affecting target state");
+       register_command(command_context, NULL, "gdb_port",
+                       handle_gdb_port_command, COMMAND_ANY,
+                       "daemon configuration command gdb_port");
+       register_command(command_context, NULL, "gdb_memory_map",
+                       handle_gdb_memory_map_command, COMMAND_CONFIG,
+                       "enable or disable memory map");
+       register_command(command_context, NULL, "gdb_flash_program",
+                       handle_gdb_flash_program_command, COMMAND_CONFIG,
+                       "enable or disable flash program");
+       register_command(command_context, NULL, "gdb_report_data_abort",
+                       handle_gdb_report_data_abort_command, COMMAND_CONFIG,
+                       "enable or disable reporting data aborts");
+       register_command(command_context, NULL, "gdb_breakpoint_override",
+                       handle_gdb_breakpoint_override_command, COMMAND_EXEC,
+                       "hard/soft/disable - force type of breakpoint "
+                       "used by gdb 'break' commands.");
        return ERROR_OK;
 }