helper/command: return proper JIM error code
[openocd.git] / src / helper / command.c
index 0561c6c5bcbcb53a3e80bb870da64b6fe91649a1..7a3c2d4fe47a6b129d55bdf3e76b7533c5b493b1 100644 (file)
  *   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, write to the                         *
- *   Free Software Foundation, Inc.,                                       *
- *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#if !BUILD_ECOSBOARD
-/* see Embedder-HOWTO.txt in Jim Tcl project hosted on BerliOS*/
+/* see Embedded-HOWTO.txt in Jim Tcl project hosted on BerliOS*/
 #define JIM_EMBEDDED
-#endif
 
-// @todo the inclusion of target.h here is a layering violation
-#include "target.h"
+/* @todo the inclusion of target.h here is a layering violation */
+#include <jtag/jtag.h>
+#include <target/target.h>
 #include "command.h"
 #include "configuration.h"
 #include "log.h"
 #include "time_support.h"
 #include "jim-eventloop.h"
 
-
-Jim_Interp *interp = NULL;
+/* nice short description of source file */
+#define __THIS__FILE__ "command.c"
 
 static int run_command(struct command_context *context,
                struct command *c, const char *words[], unsigned num_words);
 
+struct log_capture_state {
+       Jim_Interp *interp;
+       Jim_Obj *output;
+};
+
 static void tcl_output(void *privData, const char *file, unsigned line,
-               const char *function, const char *string)
+       const char *function, const char *string)
+{
+       struct log_capture_state *state = privData;
+       Jim_AppendString(state->interp, state->output, string, strlen(string));
+}
+
+static struct log_capture_state *command_log_capture_start(Jim_Interp *interp)
 {
-       Jim_Obj *tclOutput = (Jim_Obj *)privData;
-       Jim_AppendString(interp, tclOutput, string, strlen(string));
+       /* capture log output and return it. A garbage collect can
+        * happen, so we need a reference count to this object */
+       Jim_Obj *tclOutput = Jim_NewStringObj(interp, "", 0);
+       if (NULL == tclOutput)
+               return NULL;
+
+       struct log_capture_state *state = malloc(sizeof(*state));
+       if (NULL == state)
+               return NULL;
+
+       state->interp = interp;
+       Jim_IncrRefCount(tclOutput);
+       state->output = tclOutput;
+
+       log_add_callback(tcl_output, state);
+
+       return state;
+}
+
+/* Classic openocd commands provide progress output which we
+ * will capture and return as a Tcl return value.
+ *
+ * However, if a non-openocd command has been invoked, then it
+ * makes sense to return the tcl return value from that command.
+ *
+ * The tcl return value is empty for openocd commands that provide
+ * progress output.
+ *
+ * Therefore we set the tcl return value only if we actually
+ * captured output.
+ */
+static void command_log_capture_finish(struct log_capture_state *state)
+{
+       if (NULL == state)
+               return;
+
+       log_remove_callback(tcl_output, state);
+
+       int length;
+       Jim_GetString(state->output, &length);
+
+       if (length > 0)
+               Jim_SetResult(state->interp, state->output);
+       else {
+               /* No output captured, use tcl return value (which could
+                * be empty too). */
+       }
+       Jim_DecrRefCount(state->interp, state->output);
+
+       free(state);
+}
+
+static int command_retval_set(Jim_Interp *interp, int retval)
+{
+       int *return_retval = Jim_GetAssocData(interp, "retval");
+       if (return_retval != NULL)
+               *return_retval = retval;
+
+       return (retval == ERROR_OK) ? JIM_OK : retval;
 }
 
 extern struct command_context *global_cmd_ctx;
 
+/* dump a single line to the log for the command.
+ * Do nothing in case we are not at debug level 3 */
 void script_debug(Jim_Interp *interp, const char *name,
-               unsigned argc, Jim_Obj *const *argv)
+       unsigned argc, Jim_Obj * const *argv)
 {
-       LOG_DEBUG("command - %s", name);
-       for (unsigned i = 0; i < argc; i++)
-       {
+       if (debug_level < LOG_LVL_DEBUG)
+               return;
+
+       char *dbg = alloc_printf("command - %s", name);
+       for (unsigned i = 0; i < argc; i++) {
                int len;
                const char *w = Jim_GetString(argv[i], &len);
-
-               /* end of line comment? */
-               if (*w == '#')
-                       break;
-
-               LOG_DEBUG("%s - argv[%d]=%s", name, i, w);
+               char *t = alloc_printf("%s %s", dbg, w);
+               free(dbg);
+               dbg = t;
        }
+       LOG_DEBUG("%s", dbg);
+       free(dbg);
 }
 
-static void script_command_args_free(const char **words, unsigned nwords)
+static void script_command_args_free(char **words, unsigned nwords)
 {
        for (unsigned i = 0; i < nwords; i++)
-               free((void *)words[i]);
+               free(words[i]);
        free(words);
 }
-static const char **script_command_args_alloc(
-               unsigned argc, Jim_Obj *const *argv, unsigned *nwords)
+
+static char **script_command_args_alloc(
+       unsigned argc, Jim_Obj * const *argv, unsigned *nwords)
 {
-       const char **words = malloc(argc * sizeof(char *));
+       char **words = malloc(argc * sizeof(char *));
        if (NULL == words)
                return NULL;
 
        unsigned i;
-       for (i = 0; i < argc; i++)
-       {
+       for (i = 0; i < argc; i++) {
                int len;
                const char *w = Jim_GetString(argv[i], &len);
-               /* a comment may end the line early */
-               if (*w == '#')
-                       break;
-
                words[i] = strdup(w);
-               if (words[i] == NULL)
-               {
+               if (words[i] == NULL) {
                        script_command_args_free(words, i);
                        return NULL;
                }
@@ -108,72 +172,63 @@ static const char **script_command_args_alloc(
        return words;
 }
 
-static int script_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+struct command_context *current_command_context(Jim_Interp *interp)
 {
-       /* the private data is stashed in the interp structure */
-       struct command *c;
-       struct command_context *context;
-       int retval;
-
-       /* DANGER!!!! be careful what we invoke here, since interp->cmdPrivData might
-        * get overwritten by running other Jim commands! Treat it as an
-        * emphemeral global variable that is used in lieu of an argument
-        * to the fn and fish it out manually.
-        */
-       c = interp->cmdPrivData;
-       if (c == NULL)
-       {
-               LOG_ERROR("BUG: interp->cmdPrivData == NULL");
-               return JIM_ERR;
-       }
-       target_call_timer_callbacks_now();
-       LOG_USER_N("%s", ""); /* Keep GDB connection alive*/
-
-       script_debug(interp, c->name, argc, argv);
-
-       unsigned nwords;
-       const char **words = script_command_args_alloc(argc, argv, &nwords);
-       if (NULL == words)
-               return JIM_ERR;
-
        /* grab the command context from the associated data */
-       context = Jim_GetAssocData(interp, "context");
-       if (context == NULL)
-       {
+       struct command_context *cmd_ctx = Jim_GetAssocData(interp, "context");
+       if (NULL == cmd_ctx) {
                /* Tcl can invoke commands directly instead of via command_run_line(). This would
-                * happen when the Jim Tcl interpreter is provided by eCos.
+                * happen when the Jim Tcl interpreter is provided by eCos or if we are running
+                * commands in a startup script.
+                *
+                * A telnet or gdb server would provide a non-default command context to
+                * handle piping of error output, have a separate current target, etc.
                 */
-               context = global_cmd_ctx;
+               cmd_ctx = global_cmd_ctx;
        }
+       return cmd_ctx;
+}
 
-       /* capture log output and return it */
-       Jim_Obj *tclOutput = Jim_NewStringObj(interp, "", 0);
-       /* a garbage collect can happen, so we need a reference count to this object */
-       Jim_IncrRefCount(tclOutput);
+static int script_command_run(Jim_Interp *interp,
+       int argc, Jim_Obj * const *argv, struct command *c, bool capture)
+{
+       target_call_timer_callbacks_now();
+       LOG_USER_N("%s", "");   /* Keep GDB connection alive*/
 
-       log_add_callback(tcl_output, tclOutput);
+       unsigned nwords;
+       char **words = script_command_args_alloc(argc, argv, &nwords);
+       if (NULL == words)
+               return JIM_ERR;
 
-       retval = run_command(context, c, (const char **)words, nwords);
+       struct log_capture_state *state = NULL;
+       if (capture)
+               state = command_log_capture_start(interp);
 
-       log_remove_callback(tcl_output, tclOutput);
+       struct command_context *cmd_ctx = current_command_context(interp);
+       int retval = run_command(cmd_ctx, c, (const char **)words, nwords);
 
-       /* We dump output into this local variable */
-       Jim_SetResult(interp, tclOutput);
-       Jim_DecrRefCount(interp, tclOutput);
+       command_log_capture_finish(state);
 
        script_command_args_free(words, nwords);
+       return command_retval_set(interp, retval);
+}
 
-       int *return_retval = Jim_GetAssocData(interp, "retval");
-       if (return_retval != NULL)
-       {
-               *return_retval = retval;
-       }
+static int script_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+       /* the private data is stashed in the interp structure */
 
-       return (retval == ERROR_OK)?JIM_OK:JIM_ERR;
+       struct command *c = interp->cmdPrivData;
+       assert(c);
+       script_debug(interp, c->name, argc, argv);
+       return script_command_run(interp, argc, argv, c, true);
 }
 
-/* nice short description of source file */
-#define __THIS__FILE__ "command.c"
+static struct command *command_root(struct command *c)
+{
+       while (NULL != c->parent)
+               c = c->parent;
+       return c;
+}
 
 /**
  * Find a command by name from a list of commands.
@@ -182,14 +237,24 @@ static int script_command(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
  */
 static struct command *command_find(struct command *head, const char *name)
 {
-       for (struct command *cc = head; cc; cc = cc->next)
-       {
+       for (struct command *cc = head; cc; cc = cc->next) {
                if (strcmp(cc->name, name) == 0)
                        return cc;
        }
        return NULL;
 }
 
+struct command *command_find_in_context(struct command_context *cmd_ctx,
+       const char *name)
+{
+       return command_find(cmd_ctx->commands, name);
+}
+struct command *command_find_in_parent(struct command *parent,
+       const char *name)
+{
+       return command_find(parent->children, name);
+}
+
 /**
  * Add the command into the linked list, sorted by name.
  * @param head Address to head of command list pointer, which may be
@@ -199,8 +264,7 @@ static struct command *command_find(struct command *head, const char *name)
 static void command_add_child(struct command **head, struct command *c)
 {
        assert(head);
-       if (NULL == *head)
-       {
+       if (NULL == *head) {
                *head = c;
                return;
        }
@@ -218,100 +282,180 @@ static void command_add_child(struct command **head, struct command *c)
 }
 
 static struct command **command_list_for_parent(
-               struct command_context *cmd_ctx, struct command *parent)
+       struct command_context *cmd_ctx, struct command *parent)
 {
        return parent ? &parent->children : &cmd_ctx->commands;
 }
 
+static void command_free(struct command *c)
+{
+       /** @todo if command has a handler, unregister its jim command! */
+
+       while (NULL != c->children) {
+               struct command *tmp = c->children;
+               c->children = tmp->next;
+               command_free(tmp);
+       }
+
+       free(c->name);
+       free(c->help);
+       free(c->usage);
+       free(c);
+}
+
 static struct command *command_new(struct command_context *cmd_ctx,
-               struct command *parent, const char *name,
-               command_handler_t handler, enum command_mode mode,
-               const char *help)
+       struct command *parent, const struct command_registration *cr)
 {
-       assert(name);
+       assert(cr->name);
 
-       struct command *c = malloc(sizeof(struct command));
-       memset(c, 0, sizeof(struct command));
+       /*
+        * If it is a non-jim command with no .usage specified,
+        * log an error.
+        *
+        * strlen(.usage) == 0 means that the command takes no
+        * arguments.
+       */
+       if ((cr->jim_handler == NULL) && (cr->usage == NULL)) {
+               LOG_DEBUG("BUG: command '%s%s%s' does not have the "
+                       "'.usage' field filled out",
+                       parent && parent->name ? parent->name : "",
+                       parent && parent->name ? " " : "",
+                       cr->name);
+       }
+
+       struct command *c = calloc(1, sizeof(struct command));
+       if (NULL == c)
+               return NULL;
+
+       c->name = strdup(cr->name);
+       if (cr->help)
+               c->help = strdup(cr->help);
+       if (cr->usage)
+               c->usage = strdup(cr->usage);
+
+       if (!c->name || (cr->help && !c->help) || (cr->usage && !c->usage))
+               goto command_new_error;
 
-       c->name = strdup(name);
-       if (help)
-               c->help = strdup(help);
        c->parent = parent;
-       c->handler = handler;
-       c->mode = mode;
+       c->handler = cr->handler;
+       c->jim_handler = cr->jim_handler;
+       c->jim_handler_data = cr->jim_handler_data;
+       c->mode = cr->mode;
 
        command_add_child(command_list_for_parent(cmd_ctx, parent), c);
 
        return c;
+
+command_new_error:
+       command_free(c);
+       return NULL;
 }
-static void command_free(struct command *c)
+
+static int command_unknown(Jim_Interp *interp, int argc, Jim_Obj *const *argv);
+
+static int register_command_handler(struct command_context *cmd_ctx,
+       struct command *c)
 {
-       /// @todo if command has a handler, unregister its jim command!
+       Jim_Interp *interp = cmd_ctx->interp;
+       char *ocd_name = alloc_printf("ocd_%s", c->name);
+       if (NULL == ocd_name)
+               return JIM_ERR;
 
-       while (NULL != c->children)
-       {
-               struct command *tmp = c->children;
-               c->children = tmp->next;
-               command_free(tmp);
-       }
+       LOG_DEBUG("registering '%s'...", ocd_name);
 
-       if (c->name)
-               free(c->name);
-       if (c->help)
-               free((void*)c->help);
-       free(c);
+       Jim_CmdProc *func = c->handler ? &script_command : &command_unknown;
+       int retval = Jim_CreateCommand(interp, ocd_name, func, c, NULL);
+       free(ocd_name);
+       if (JIM_OK != retval)
+               return retval;
+
+       /* we now need to add an overrideable proc */
+       char *override_name = alloc_printf(
+                       "proc %s {args} {eval ocd_bouncer %s $args}",
+                       c->name, c->name);
+       if (NULL == override_name)
+               return JIM_ERR;
+
+       retval = Jim_Eval_Named(interp, override_name, 0, 0);
+       free(override_name);
+
+       return retval;
 }
 
-struct command* register_command(struct command_context *context,
-               struct command *parent, const char *name,
-               command_handler_t handler, enum command_mode mode,
-               const char *help)
+struct command *register_command(struct command_context *context,
+       struct command *parent, const struct command_registration *cr)
 {
-       if (!context || !name)
+       if (!context || !cr->name)
                return NULL;
 
+       const char *name = cr->name;
        struct command **head = command_list_for_parent(context, parent);
        struct command *c = command_find(*head, name);
-       if (NULL != c)
-       {
-               LOG_ERROR("command '%s' is already registered in '%s' context",
-                               name, parent ? parent->name : "<global>");
+       if (NULL != c) {
+               /* TODO: originally we treated attempting to register a cmd twice as an error
+                * Sometimes we need this behaviour, such as with flash banks.
+                * http://www.mail-archive.com/openocd-development@lists.berlios.de/msg11152.html */
+               LOG_DEBUG("command '%s' is already registered in '%s' context",
+                       name, parent ? parent->name : "<global>");
                return c;
        }
 
-       c = command_new(context, parent, name, handler, mode, help);
-       /* if allocation failed or it is a placeholder (no handler), we're done */
-       if (NULL == c || NULL == c->handler)
-               return c;
-
-       const char *full_name = command_name(c, '_');
-
-       const char *ocd_name = alloc_printf("ocd_%s", full_name);
-       Jim_CreateCommand(interp, ocd_name, script_command, c, NULL);
-       free((void *)ocd_name);
-
-       /* we now need to add an overrideable proc */
-       const char *override_name = alloc_printf("proc %s {args} {"
-                       "if {[catch {eval ocd_%s $args}] == 0} "
-                       "{return \"\"} else {return -code error}}",
-                       full_name, full_name);
-       Jim_Eval_Named(interp, override_name, __THIS__FILE__, __LINE__);
-       free((void *)override_name);
+       c = command_new(context, parent, cr);
+       if (NULL == c)
+               return NULL;
 
-       free((void *)full_name);
+       int retval = ERROR_OK;
+       if (NULL != cr->jim_handler && NULL == parent) {
+               retval = Jim_CreateCommand(context->interp, cr->name,
+                               cr->jim_handler, cr->jim_handler_data, NULL);
+       } else if (NULL != cr->handler || NULL != parent)
+               retval = register_command_handler(context, command_root(c));
 
+       if (ERROR_OK != retval) {
+               unregister_command(context, parent, name);
+               c = NULL;
+       }
        return c;
 }
 
+int register_commands(struct command_context *cmd_ctx, struct command *parent,
+       const struct command_registration *cmds)
+{
+       int retval = ERROR_OK;
+       unsigned i;
+       for (i = 0; cmds[i].name || cmds[i].chain; i++) {
+               const struct command_registration *cr = cmds + i;
+
+               struct command *c = NULL;
+               if (NULL != cr->name) {
+                       c = register_command(cmd_ctx, parent, cr);
+                       if (NULL == c) {
+                               retval = ERROR_FAIL;
+                               break;
+                       }
+               }
+               if (NULL != cr->chain) {
+                       struct command *p = c ? : parent;
+                       retval = register_commands(cmd_ctx, p, cr->chain);
+                       if (ERROR_OK != retval)
+                               break;
+               }
+       }
+       if (ERROR_OK != retval) {
+               for (unsigned j = 0; j < i; j++)
+                       unregister_command(cmd_ctx, parent, cmds[j].name);
+       }
+       return retval;
+}
+
 int unregister_all_commands(struct command_context *context,
-               struct command *parent)
+       struct command *parent)
 {
        if (context == NULL)
                return ERROR_OK;
 
        struct command **head = command_list_for_parent(context, parent);
-       while (NULL != *head)
-       {
+       while (NULL != *head) {
                struct command *tmp = *head;
                *head = tmp->next;
                command_free(tmp);
@@ -321,15 +465,14 @@ int unregister_all_commands(struct command_context *context,
 }
 
 int unregister_command(struct command_context *context,
-               struct command *parent, const char *name)
+       struct command *parent, const char *name)
 {
        if ((!context) || (!name))
-               return ERROR_INVALID_ARGUMENTS;
+               return ERROR_COMMAND_SYNTAX_ERROR;
 
        struct command *p = NULL;
        struct command **head = command_list_for_parent(context, parent);
-       for (struct command *c = *head; NULL != c; p = c, c = c->next)
-       {
+       for (struct command *c = *head; NULL != c; p = c, c = c->next) {
                if (strcmp(name, c->name) != 0)
                        continue;
 
@@ -345,11 +488,18 @@ int unregister_command(struct command_context *context,
        return ERROR_OK;
 }
 
+void command_set_handler_data(struct command *c, void *p)
+{
+       if (NULL != c->handler || NULL != c->jim_handler)
+               c->jim_handler_data = p;
+       for (struct command *cc = c->children; NULL != cc; cc = cc->next)
+               command_set_handler_data(cc, p);
+}
+
 void command_output_text(struct command_context *context, const char *data)
 {
-       if (context && context->output_handler && data) {
+       if (context && context->output_handler && data)
                context->output_handler(context, data);
-       }
 }
 
 void command_print_sameline(struct command_context *context, const char *format, ...)
@@ -360,16 +510,15 @@ void command_print_sameline(struct command_context *context, const char *format,
        va_start(ap, format);
 
        string = alloc_vprintf(format, ap);
-       if (string != NULL)
-       {
+       if (string != NULL) {
                /* we want this collected in the log + we also want to pick it up as a tcl return
                 * value.
                 *
                 * The latter bit isn't precisely neat, but will do for now.
                 */
                LOG_USER_N("%s", string);
-               /* We already printed it above */
-               /* command_output_text(context, string); */
+               /* We already printed it above
+                * command_output_text(context, string); */
                free(string);
        }
 
@@ -384,17 +533,17 @@ void command_print(struct command_context *context, const char *format, ...)
        va_start(ap, format);
 
        string = alloc_vprintf(format, ap);
-       if (string != NULL)
-       {
-               strcat(string, "\n"); /* alloc_vprintf guaranteed the buffer to be at least one char longer */
+       if (string != NULL) {
+               strcat(string, "\n");   /* alloc_vprintf guaranteed the buffer to be at least one
+                                        *char longer */
                /* we want this collected in the log + we also want to pick it up as a tcl return
                 * value.
                 *
                 * The latter bit isn't precisely neat, but will do for now.
                 */
                LOG_USER_N("%s", string);
-               /* We already printed it above */
-               /* command_output_text(context, string); */
+               /* We already printed it above
+                * command_output_text(context, string); */
                free(string);
        }
 
@@ -406,11 +555,15 @@ static char *__command_name(struct command *c, char delim, unsigned extra)
        char *name;
        unsigned len = strlen(c->name);
        if (NULL == c->parent) {
-               // allocate enough for the name, child names, and '\0'
+               /* allocate enough for the name, child names, and '\0' */
                name = malloc(len + extra + 1);
+               if (!name) {
+                       LOG_ERROR("Out of memory");
+                       return NULL;
+               }
                strcpy(name, c->name);
        } else {
-               // parent's extra must include both the space and name
+               /* parent's extra must include both the space and name */
                name = __command_name(c->parent, delim, 1 + len + extra);
                char dstr[2] = { delim, 0 };
                strcat(name, dstr);
@@ -418,48 +571,85 @@ static char *__command_name(struct command *c, char delim, unsigned extra)
        }
        return name;
 }
+
 char *command_name(struct command *c, char delim)
 {
        return __command_name(c, delim, 0);
 }
 
+static bool command_can_run(struct command_context *cmd_ctx, struct command *c)
+{
+       if (c->mode == COMMAND_ANY || c->mode == cmd_ctx->mode)
+               return true;
+
+       /* Many commands may be run only before/after 'init' */
+       const char *when;
+       switch (c->mode) {
+               case COMMAND_CONFIG:
+                       when = "before";
+                       break;
+               case COMMAND_EXEC:
+                       when = "after";
+                       break;
+               /* handle the impossible with humor; it guarantees a bug report! */
+               default:
+                       when = "if Cthulhu is summoned by";
+                       break;
+       }
+       char *full_name = command_name(c, ' ');
+       LOG_ERROR("The '%s' command must be used %s 'init'.",
+                       full_name ? full_name : c->name, when);
+       free(full_name);
+       return false;
+}
+
 static int run_command(struct command_context *context,
-               struct command *c, const char *words[], unsigned num_words)
+       struct command *c, const char *words[], unsigned num_words)
 {
-       if (!((context->mode == COMMAND_CONFIG) || (c->mode == COMMAND_ANY) || (c->mode == context->mode)))
-       {
-               /* Config commands can not run after the config stage */
-               LOG_ERROR("Command '%s' only runs during configuration stage", c->name);
+       if (!command_can_run(context, c))
                return ERROR_FAIL;
-       }
 
        struct command_invocation cmd = {
-                       .ctx = context,
-                       .name = c->name,
-                       .argc = num_words - 1,
-                       .argv = words + 1,
-               };
+               .ctx = context,
+               .current = c,
+               .name = c->name,
+               .argc = num_words - 1,
+               .argv = words + 1,
+       };
+       /* Black magic of overridden current target:
+        * If the command we are going to handle has a target prefix,
+        * override the current target temporarily for the time
+        * of processing the command.
+        * current_target_override is used also for event handlers
+        * therefore we prevent touching it if command has no prefix.
+        * Previous override is saved and restored back to ensure
+        * correct work when run_command() is re-entered. */
+       struct target *saved_target_override = context->current_target_override;
+       if (c->jim_handler_data)
+               context->current_target_override = c->jim_handler_data;
+
        int retval = c->handler(&cmd);
-       if (retval == ERROR_COMMAND_SYNTAX_ERROR)
-       {
+
+       if (c->jim_handler_data)
+               context->current_target_override = saved_target_override;
+
+       if (retval == ERROR_COMMAND_SYNTAX_ERROR) {
                /* Print help for command */
                char *full_name = command_name(c, ' ');
                if (NULL != full_name) {
-                       command_run_linef(context, "help %s", full_name);
+                       command_run_linef(context, "usage %s", full_name);
                        free(full_name);
-               } else
-                       retval = -ENOMEM;
-       }
-       else if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
-       {
+               }
+       } else if (retval == ERROR_COMMAND_CLOSE_CONNECTION) {
                /* just fall through for a shutdown request */
-       }
-       else if (retval != ERROR_OK)
-       {
+       } else if (retval != ERROR_OK) {
                /* we do not print out an error message because the command *should*
                 * have printed out an error
                 */
-               LOG_DEBUG("Command failed with error code %d", retval);
+               char *full_name = command_name(c, ' ');
+               LOG_DEBUG("Command '%s' failed with error code %d",
+                                       full_name ? full_name : c->name, retval);
+               free(full_name);
        }
 
        return retval;
@@ -479,47 +669,31 @@ int command_run_line(struct command_context *context, char *line)
         * happen when the Jim Tcl interpreter is provided by eCos for
         * instance.
         */
+       context->current_target_override = NULL;
+
+       Jim_Interp *interp = context->interp;
        Jim_DeleteAssocData(interp, "context");
        retcode = Jim_SetAssocData(interp, "context", NULL, context);
-       if (retcode == JIM_OK)
-       {
+       if (retcode == JIM_OK) {
                /* associated the return value */
                Jim_DeleteAssocData(interp, "retval");
                retcode = Jim_SetAssocData(interp, "retval", NULL, &retval);
-               if (retcode == JIM_OK)
-               {
-                       retcode = Jim_Eval_Named(interp, line, __THIS__FILE__, __LINE__);
+               if (retcode == JIM_OK) {
+                       retcode = Jim_Eval_Named(interp, line, 0, 0);
 
                        Jim_DeleteAssocData(interp, "retval");
                }
                Jim_DeleteAssocData(interp, "context");
        }
-       if (retcode == JIM_ERR) {
-               if (retval != ERROR_COMMAND_CLOSE_CONNECTION)
-               {
-                       /* We do not print the connection closed error message */
-                       Jim_PrintErrorMessage(interp);
-               }
-               if (retval == ERROR_OK)
-               {
-                       /* It wasn't a low level OpenOCD command that failed */
-                       return ERROR_FAIL;
-               }
-               return retval;
-       } else if (retcode == JIM_EXIT) {
-               /* ignore. */
-               /* exit(Jim_GetExitCode(interp)); */
-       } else {
+       if (retcode == JIM_OK) {
                const char *result;
                int reslen;
 
                result = Jim_GetString(Jim_GetResult(interp), &reslen);
-               if (reslen > 0)
-               {
+               if (reslen > 0) {
                        int i;
                        char buff[256 + 1];
-                       for (i = 0; i < reslen; i += 256)
-                       {
+                       for (i = 0; i < reslen; i += 256) {
                                int chunk;
                                chunk = reslen - i;
                                if (chunk > 256)
@@ -528,10 +702,25 @@ int command_run_line(struct command_context *context, char *line)
                                buff[chunk] = 0;
                                LOG_USER_N("%s", buff);
                        }
-                       LOG_USER_N("%s", "\n");
+                       LOG_USER_N("\n");
                }
                retval = ERROR_OK;
+       } else if (retcode == JIM_EXIT) {
+               /* ignore.
+                * exit(Jim_GetExitCode(interp)); */
+       } else if (retcode == ERROR_COMMAND_CLOSE_CONNECTION) {
+               return retcode;
+       } else {
+               Jim_MakeErrorMessage(interp);
+               LOG_USER("%s", Jim_GetString(Jim_GetResult(interp), NULL));
+
+               if (retval == ERROR_OK) {
+                       /* It wasn't a low level OpenOCD command that failed */
+                       return ERROR_FAIL;
+               }
+               return retval;
        }
+
        return retval;
 }
 
@@ -542,36 +731,36 @@ int command_run_linef(struct command_context *context, const char *format, ...)
        va_list ap;
        va_start(ap, format);
        string = alloc_vprintf(format, ap);
-       if (string != NULL)
-       {
+       if (string != NULL) {
                retval = command_run_line(context, string);
+               free(string);
        }
        va_end(ap);
        return retval;
 }
 
-void command_set_output_handler(struct command_contextcontext,
-               command_output_handler_t output_handler, void *priv)
+void command_set_output_handler(struct command_context *context,
+       command_output_handler_t output_handler, void *priv)
 {
        context->output_handler = output_handler;
        context->output_handler_priv = priv;
 }
 
-struct command_context* copy_command_context(struct command_context* context)
+struct command_context *copy_command_context(struct command_context *context)
 {
-       struct command_contextcopy_context = malloc(sizeof(struct command_context));
+       struct command_context *copy_context = malloc(sizeof(struct command_context));
 
        *copy_context = *context;
 
        return copy_context;
 }
 
-int command_done(struct command_context *context)
+void command_done(struct command_context *cmd_ctx)
 {
-       free(context);
-       context = NULL;
+       if (NULL == cmd_ctx)
+               return;
 
-       return ERROR_OK;
+       free(cmd_ctx);
 }
 
 /* find full path to file */
@@ -590,243 +779,423 @@ static int jim_find(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
        return JIM_OK;
 }
 
-static int jim_echo(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+COMMAND_HANDLER(jim_echo)
 {
-       if (argc != 2)
+       if (CMD_ARGC == 2 && !strcmp(CMD_ARGV[0], "-n")) {
+               LOG_USER_N("%s", CMD_ARGV[1]);
+               return JIM_OK;
+       }
+       if (CMD_ARGC != 1)
                return JIM_ERR;
-       const char *str = Jim_GetString(argv[1], NULL);
-       LOG_USER("%s", str);
+       LOG_USER("%s", CMD_ARGV[0]);
        return JIM_OK;
 }
 
-static size_t openocd_jim_fwrite(const void *_ptr, size_t size, size_t n, void *cookie)
-{
-       size_t nbytes;
-       const char *ptr;
-       Jim_Interp *interp;
-
-       /* make it a char easier to read code */
-       ptr = _ptr;
-       interp = cookie;
-       nbytes = size * n;
-       if (ptr == NULL || interp == NULL || nbytes == 0) {
-               return 0;
-       }
-
-       /* do we have to chunk it? */
-       if (ptr[nbytes] == 0)
-       {
-               /* no it is a C style string */
-               LOG_USER_N("%s", ptr);
-               return strlen(ptr);
-       }
-       /* GRR we must chunk - not null terminated */
-       while (nbytes) {
-               char chunk[128 + 1];
-               int x;
-
-               x = nbytes;
-               if (x > 128) {
-                       x = 128;
-               }
-               /* copy it */
-               memcpy(chunk, ptr, x);
-               /* terminate it */
-               chunk[n] = 0;
-               /* output it */
-               LOG_USER_N("%s", chunk);
-               ptr += x;
-               nbytes -= x;
-       }
-
-       return n;
-}
-
-static size_t openocd_jim_fread(void *ptr, size_t size, size_t n, void *cookie)
-{
-       /* TCL wants to read... tell him no */
-       return 0;
-}
-
-static int openocd_jim_vfprintf(void *cookie, const char *fmt, va_list ap)
-{
-       char *cp;
-       int n;
-       Jim_Interp *interp;
-
-       n = -1;
-       interp = cookie;
-       if (interp == NULL)
-               return n;
-
-       cp = alloc_vprintf(fmt, ap);
-       if (cp)
-       {
-               LOG_USER_N("%s", cp);
-               n = strlen(cp);
-               free(cp);
-       }
-       return n;
-}
-
-static int openocd_jim_fflush(void *cookie)
-{
-       /* nothing to flush */
-       return 0;
-}
-
-static char* openocd_jim_fgets(char *s, int size, void *cookie)
-{
-       /* not supported */
-       errno = ENOTSUP;
-       return NULL;
-}
-
+/* Capture progress output and return as tcl return value. If the
+ * progress output was empty, return tcl return value.
+ */
 static int jim_capture(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
 {
        if (argc != 2)
                return JIM_ERR;
-       int retcode;
-       const char *str = Jim_GetString(argv[1], NULL);
 
-       /* capture log output and return it */
-       Jim_Obj *tclOutput = Jim_NewStringObj(interp, "", 0);
-       /* a garbage collect can happen, so we need a reference count to this object */
-       Jim_IncrRefCount(tclOutput);
+       struct log_capture_state *state = command_log_capture_start(interp);
+
+       /* disable polling during capture. This avoids capturing output
+        * from polling.
+        *
+        * This is necessary in order to avoid accidentally getting a non-empty
+        * string for tcl fn's.
+        */
+       bool save_poll = jtag_poll_get_enabled();
 
-       log_add_callback(tcl_output, tclOutput);
+       jtag_poll_set_enabled(false);
 
-       retcode = Jim_Eval_Named(interp, str, __THIS__FILE__, __LINE__);
+       const char *str = Jim_GetString(argv[1], NULL);
+       int retcode = Jim_Eval_Named(interp, str, __THIS__FILE__, __LINE__);
 
-       log_remove_callback(tcl_output, tclOutput);
+       jtag_poll_set_enabled(save_poll);
 
-       /* We dump output into this local variable */
-       Jim_SetResult(interp, tclOutput);
-       Jim_DecrRefCount(interp, tclOutput);
+       command_log_capture_finish(state);
 
        return retcode;
 }
 
 static COMMAND_HELPER(command_help_find, struct command *head,
-               struct command **out)
+       struct command **out)
 {
        if (0 == CMD_ARGC)
-               return ERROR_INVALID_ARGUMENTS;
+               return ERROR_COMMAND_SYNTAX_ERROR;
        *out = command_find(head, CMD_ARGV[0]);
+       if (NULL == *out && strncmp(CMD_ARGV[0], "ocd_", 4) == 0)
+               *out = command_find(head, CMD_ARGV[0] + 4);
        if (NULL == *out)
-               return ERROR_INVALID_ARGUMENTS;
+               return ERROR_COMMAND_SYNTAX_ERROR;
        if (--CMD_ARGC == 0)
                return ERROR_OK;
        CMD_ARGV++;
        return CALL_COMMAND_HANDLER(command_help_find, (*out)->children, out);
 }
 
-static COMMAND_HELPER(command_help_show, struct command *c, unsigned n);
+static COMMAND_HELPER(command_help_show, struct command *c, unsigned n,
+       bool show_help, const char *cmd_match);
 
-static COMMAND_HELPER(command_help_show_list, struct command *head, unsigned n)
+static COMMAND_HELPER(command_help_show_list, struct command *head, unsigned n,
+       bool show_help, const char *cmd_match)
 {
        for (struct command *c = head; NULL != c; c = c->next)
-               CALL_COMMAND_HANDLER(command_help_show, c, n);
+               CALL_COMMAND_HANDLER(command_help_show, c, n, show_help, cmd_match);
        return ERROR_OK;
 }
-static COMMAND_HELPER(command_help_show, struct command *c, unsigned n)
+
+#define HELP_LINE_WIDTH(_n) (int)(76 - (2 * _n))
+
+static void command_help_show_indent(unsigned n)
+{
+       for (unsigned i = 0; i < n; i++)
+               LOG_USER_N("  ");
+}
+static void command_help_show_wrap(const char *str, unsigned n, unsigned n2)
 {
-       command_run_linef(CMD_CTX, "cmd_help {%s} {%s} %d", command_name(c, ' '),
-                       c->help ? : "no help available", n);
+       const char *cp = str, *last = str;
+       while (*cp) {
+               const char *next = last;
+               do {
+                       cp = next;
+                       do {
+                               next++;
+                       } while (*next != ' ' && *next != '\t' && *next != '\0');
+               } while ((next - last < HELP_LINE_WIDTH(n)) && *next != '\0');
+               if (next - last < HELP_LINE_WIDTH(n))
+                       cp = next;
+               command_help_show_indent(n);
+               LOG_USER("%.*s", (int)(cp - last), last);
+               last = cp + 1;
+               n = n2;
+       }
+}
 
-       if (++n >= 2)
-               return ERROR_OK;
+static COMMAND_HELPER(command_help_show, struct command *c, unsigned n,
+       bool show_help, const char *cmd_match)
+{
+       char *cmd_name = command_name(c, ' ');
+       if (NULL == cmd_name)
+               return ERROR_FAIL;
+
+       /* If the match string occurs anywhere, we print out
+        * stuff for this command. */
+       bool is_match = (strstr(cmd_name, cmd_match) != NULL) ||
+               ((c->usage != NULL) && (strstr(c->usage, cmd_match) != NULL)) ||
+               ((c->help != NULL) && (strstr(c->help, cmd_match) != NULL));
 
-       return CALL_COMMAND_HANDLER(command_help_show_list, c->children, n);
+       if (is_match) {
+               command_help_show_indent(n);
+               LOG_USER_N("%s", cmd_name);
+       }
+       free(cmd_name);
+
+       if (is_match) {
+               if (c->usage && strlen(c->usage) > 0) {
+                       LOG_USER_N(" ");
+                       command_help_show_wrap(c->usage, 0, n + 5);
+               } else
+                       LOG_USER_N("\n");
+       }
+
+       if (is_match && show_help) {
+               char *msg;
+
+               /* Normal commands are runtime-only; highlight exceptions */
+               if (c->mode != COMMAND_EXEC) {
+                       const char *stage_msg = "";
+
+                       switch (c->mode) {
+                               case COMMAND_CONFIG:
+                                       stage_msg = " (configuration command)";
+                                       break;
+                               case COMMAND_ANY:
+                                       stage_msg = " (command valid any time)";
+                                       break;
+                               default:
+                                       stage_msg = " (?mode error?)";
+                                       break;
+                       }
+                       msg = alloc_printf("%s%s", c->help ? : "", stage_msg);
+               } else
+                       msg = alloc_printf("%s", c->help ? : "");
+
+               if (NULL != msg) {
+                       command_help_show_wrap(msg, n + 3, n + 3);
+                       free(msg);
+               } else
+                       return -ENOMEM;
+       }
+
+       if (++n > 5) {
+               LOG_ERROR("command recursion exceeded");
+               return ERROR_FAIL;
+       }
+
+       return CALL_COMMAND_HANDLER(command_help_show_list,
+               c->children, n, show_help, cmd_match);
 }
+
 COMMAND_HANDLER(handle_help_command)
 {
+       bool full = strcmp(CMD_NAME, "help") == 0;
+       int retval;
        struct command *c = CMD_CTX->commands;
+       char *cmd_match = NULL;
+
+       if (CMD_ARGC == 0)
+               cmd_match = "";
+       else if (CMD_ARGC >= 1) {
+               unsigned i;
+
+               for (i = 0; i < CMD_ARGC; ++i) {
+                       if (NULL != cmd_match) {
+                               char *prev = cmd_match;
+
+                               cmd_match = alloc_printf("%s %s", cmd_match, CMD_ARGV[i]);
+                               free(prev);
+                               if (NULL == cmd_match) {
+                                       LOG_ERROR("unable to build search string");
+                                       return -ENOMEM;
+                               }
+                       } else {
+                               cmd_match = alloc_printf("%s", CMD_ARGV[i]);
+                               if (NULL == cmd_match) {
+                                       LOG_ERROR("unable to build search string");
+                                       return -ENOMEM;
+                               }
+                       }
+               }
+       } else
+               return ERROR_COMMAND_SYNTAX_ERROR;
 
-       if (0 == CMD_ARGC)
-               return CALL_COMMAND_HANDLER(command_help_show_list, c, 0);
+       retval = CALL_COMMAND_HANDLER(command_help_show_list,
+                       c, 0, full, cmd_match);
 
-       int retval = CALL_COMMAND_HANDLER(command_help_find, c, &c);
-       if (ERROR_OK != retval)
-               return retval;
+       if (CMD_ARGC >= 1)
+               free(cmd_match);
+       return retval;
+}
+
+static int command_unknown_find(unsigned argc, Jim_Obj *const *argv,
+       struct command *head, struct command **out, bool top_level)
+{
+       if (0 == argc)
+               return argc;
+       const char *cmd_name = Jim_GetString(argv[0], NULL);
+       struct command *c = command_find(head, cmd_name);
+       if (NULL == c && top_level && strncmp(cmd_name, "ocd_", 4) == 0)
+               c = command_find(head, cmd_name + 4);
+       if (NULL == c)
+               return argc;
+       *out = c;
+       return command_unknown_find(--argc, ++argv, (*out)->children, out, false);
+}
+
+static int command_unknown(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+       const char *cmd_name = Jim_GetString(argv[0], NULL);
+       if (strcmp(cmd_name, "unknown") == 0) {
+               if (argc == 1)
+                       return JIM_OK;
+               argc--;
+               argv++;
+       }
+       script_debug(interp, cmd_name, argc, argv);
+
+       struct command_context *cmd_ctx = current_command_context(interp);
+       struct command *c = cmd_ctx->commands;
+       int remaining = command_unknown_find(argc, argv, c, &c, true);
+       /* if nothing could be consumed, then it's really an unknown command */
+       if (remaining == argc) {
+               const char *cmd = Jim_GetString(argv[0], NULL);
+               LOG_ERROR("Unknown command:\n  %s", cmd);
+               return JIM_OK;
+       }
+
+       bool found = true;
+       Jim_Obj *const *start;
+       unsigned count;
+       if (c->handler || c->jim_handler) {
+               /* include the command name in the list */
+               count = remaining + 1;
+               start = argv + (argc - remaining - 1);
+       } else {
+               c = command_find(cmd_ctx->commands, "usage");
+               if (NULL == c) {
+                       LOG_ERROR("unknown command, but usage is missing too");
+                       return JIM_ERR;
+               }
+               count = argc - remaining;
+               start = argv;
+               found = false;
+       }
+       /* pass the command through to the intended handler */
+       if (c->jim_handler) {
+               if (!command_can_run(cmd_ctx, c))
+                       return JIM_ERR;
 
-       return CALL_COMMAND_HANDLER(command_help_show, c, 0);
+               interp->cmdPrivData = c->jim_handler_data;
+               return (*c->jim_handler)(interp, count, start);
+       }
+
+       return script_command_run(interp, count, start, c, found);
+}
+
+static int jim_command_mode(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+       struct command_context *cmd_ctx = current_command_context(interp);
+       enum command_mode mode;
+
+       if (argc > 1) {
+               struct command *c = cmd_ctx->commands;
+               int remaining = command_unknown_find(argc - 1, argv + 1, c, &c, true);
+               /* if nothing could be consumed, then it's an unknown command */
+               if (remaining == argc - 1) {
+                       Jim_SetResultString(interp, "unknown", -1);
+                       return JIM_OK;
+               }
+               mode = c->mode;
+       } else
+               mode = cmd_ctx->mode;
+
+       const char *mode_str;
+       switch (mode) {
+               case COMMAND_ANY:
+                       mode_str = "any";
+                       break;
+               case COMMAND_CONFIG:
+                       mode_str = "config";
+                       break;
+               case COMMAND_EXEC:
+                       mode_str = "exec";
+                       break;
+               default:
+                       mode_str = "unknown";
+                       break;
+       }
+       Jim_SetResultString(interp, mode_str, -1);
+       return JIM_OK;
 }
 
+static int jim_command_type(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
+{
+       if (1 == argc)
+               return JIM_ERR;
+
+       struct command_context *cmd_ctx = current_command_context(interp);
+       struct command *c = cmd_ctx->commands;
+       int remaining = command_unknown_find(argc - 1, argv + 1, c, &c, true);
+       /* if nothing could be consumed, then it's an unknown command */
+       if (remaining == argc - 1) {
+               Jim_SetResultString(interp, "unknown", -1);
+               return JIM_OK;
+       }
+
+       if (c->jim_handler)
+               Jim_SetResultString(interp, "native", -1);
+       else if (c->handler)
+               Jim_SetResultString(interp, "simple", -1);
+       else if (remaining == 0)
+               Jim_SetResultString(interp, "group", -1);
+       else
+               Jim_SetResultString(interp, "unknown", -1);
+
+       return JIM_OK;
+}
 
 int help_add_command(struct command_context *cmd_ctx, struct command *parent,
-               const char *cmd_name, const char *help_text)
+       const char *cmd_name, const char *help_text, const char *usage)
 {
        struct command **head = command_list_for_parent(cmd_ctx, parent);
        struct command *nc = command_find(*head, cmd_name);
-       if (NULL == nc)
-       {
-               // add a new command with help text
-               nc = register_command(cmd_ctx, parent, cmd_name,
-                               NULL, COMMAND_ANY, help_text);
-               if (NULL == nc)
-               {
+       if (NULL == nc) {
+               /* add a new command with help text */
+               struct command_registration cr = {
+                       .name = cmd_name,
+                       .mode = COMMAND_ANY,
+                       .help = help_text,
+                       .usage = usage,
+               };
+               nc = register_command(cmd_ctx, parent, &cr);
+               if (NULL == nc) {
                        LOG_ERROR("failed to add '%s' help text", cmd_name);
                        return ERROR_FAIL;
                }
                LOG_DEBUG("added '%s' help text", cmd_name);
+               return ERROR_OK;
        }
-       else
-       {
+       if (help_text) {
                bool replaced = false;
-               if (nc->help)
-               {
-                       free((void *)nc->help);
+               if (nc->help) {
+                       free(nc->help);
                        replaced = true;
                }
                nc->help = strdup(help_text);
-
                if (replaced)
                        LOG_INFO("replaced existing '%s' help", cmd_name);
                else
                        LOG_DEBUG("added '%s' help text", cmd_name);
        }
+       if (usage) {
+               bool replaced = false;
+               if (nc->usage) {
+                       free(nc->usage);
+                       replaced = true;
+               }
+               nc->usage = strdup(usage);
+               if (replaced)
+                       LOG_INFO("replaced existing '%s' usage", cmd_name);
+               else
+                       LOG_DEBUG("added '%s' usage text", cmd_name);
+       }
        return ERROR_OK;
 }
 
 COMMAND_HANDLER(handle_help_add_command)
 {
-       if (CMD_ARGC < 2)
-       {
+       if (CMD_ARGC < 2) {
                LOG_ERROR("%s: insufficient arguments", CMD_NAME);
-               return ERROR_INVALID_ARGUMENTS;
+               return ERROR_COMMAND_SYNTAX_ERROR;
        }
 
-       // save help text and remove it from argument list
-       const char *help_text = CMD_ARGV[--CMD_ARGC];
-       // likewise for the leaf command name
+       /* save help text and remove it from argument list */
+       const char *str = CMD_ARGV[--CMD_ARGC];
+       const char *help = !strcmp(CMD_NAME, "add_help_text") ? str : NULL;
+       const char *usage = !strcmp(CMD_NAME, "add_usage_text") ? str : NULL;
+       if (!help && !usage) {
+               LOG_ERROR("command name '%s' is unknown", CMD_NAME);
+               return ERROR_COMMAND_SYNTAX_ERROR;
+       }
+       /* likewise for the leaf command name */
        const char *cmd_name = CMD_ARGV[--CMD_ARGC];
 
        struct command *c = NULL;
-       if (CMD_ARGC > 0)
-       {
+       if (CMD_ARGC > 0) {
                c = CMD_CTX->commands;
                int retval = CALL_COMMAND_HANDLER(command_help_find, c, &c);
                if (ERROR_OK != retval)
                        return retval;
        }
-       return help_add_command(CMD_CTX, c, cmd_name, help_text);
+       return help_add_command(CMD_CTX, c, cmd_name, help, usage);
 }
 
-/* sleep command sleeps for <n> miliseconds
+/* sleep command sleeps for <n> milliseconds
  * this is useful in target startup scripts
  */
 COMMAND_HANDLER(handle_sleep_command)
 {
        bool busy = false;
-       if (CMD_ARGC == 2)
-       {
+       if (CMD_ARGC == 2) {
                if (strcmp(CMD_ARGV[1], "busy") == 0)
                        busy = true;
                else
                        return ERROR_COMMAND_SYNTAX_ERROR;
-       }
-       else if (CMD_ARGC < 1 || CMD_ARGC > 2)
+       } else if (CMD_ARGC < 1 || CMD_ARGC > 2)
                return ERROR_COMMAND_SYNTAX_ERROR;
 
        unsigned long duration = 0;
@@ -834,40 +1203,120 @@ COMMAND_HANDLER(handle_sleep_command)
        if (ERROR_OK != retval)
                return retval;
 
-       if (!busy)
-       {
-               long long then = timeval_ms();
-               while (timeval_ms() - then < (long long)duration)
-               {
+       if (!busy) {
+               int64_t then = timeval_ms();
+               while (timeval_ms() - then < (int64_t)duration) {
                        target_call_timer_callbacks_now();
                        usleep(1000);
                }
-       }
-       else
+       } else
                busy_sleep(duration);
 
        return ERROR_OK;
 }
 
-struct command_context* command_init(const char *startup_tcl)
+static const struct command_registration command_subcommand_handlers[] = {
+       {
+               .name = "mode",
+               .mode = COMMAND_ANY,
+               .jim_handler = jim_command_mode,
+               .usage = "[command_name ...]",
+               .help = "Returns the command modes allowed by a  command:"
+                       "'any', 'config', or 'exec'.  If no command is"
+                       "specified, returns the current command mode.  "
+                       "Returns 'unknown' if an unknown command is given. "
+                       "Command can be multiple tokens.",
+       },
+       {
+               .name = "type",
+               .mode = COMMAND_ANY,
+               .jim_handler = jim_command_type,
+               .usage = "command_name [...]",
+               .help = "Returns the type of built-in command:"
+                       "'native', 'simple', 'group', or 'unknown'. "
+                       "Command can be multiple tokens.",
+       },
+       COMMAND_REGISTRATION_DONE
+};
+
+static const struct command_registration command_builtin_handlers[] = {
+       {
+               .name = "echo",
+               .handler = jim_echo,
+               .mode = COMMAND_ANY,
+               .help = "Logs a message at \"user\" priority. "
+                       "Output message to stdout. "
+                       "Option \"-n\" suppresses trailing newline",
+               .usage = "[-n] string",
+       },
+       {
+               .name = "add_help_text",
+               .handler = handle_help_add_command,
+               .mode = COMMAND_ANY,
+               .help = "Add new command help text; "
+                       "Command can be multiple tokens.",
+               .usage = "command_name helptext_string",
+       },
+       {
+               .name = "add_usage_text",
+               .handler = handle_help_add_command,
+               .mode = COMMAND_ANY,
+               .help = "Add new command usage text; "
+                       "command can be multiple tokens.",
+               .usage = "command_name usage_string",
+       },
+       {
+               .name = "sleep",
+               .handler = handle_sleep_command,
+               .mode = COMMAND_ANY,
+               .help = "Sleep for specified number of milliseconds.  "
+                       "\"busy\" will busy wait instead (avoid this).",
+               .usage = "milliseconds ['busy']",
+       },
+       {
+               .name = "help",
+               .handler = handle_help_command,
+               .mode = COMMAND_ANY,
+               .help = "Show full command help; "
+                       "command can be multiple tokens.",
+               .usage = "[command_name]",
+       },
+       {
+               .name = "usage",
+               .handler = handle_help_command,
+               .mode = COMMAND_ANY,
+               .help = "Show basic command usage; "
+                       "command can be multiple tokens.",
+               .usage = "[command_name]",
+       },
+       {
+               .name = "command",
+               .mode = COMMAND_ANY,
+               .help = "core command group (introspection)",
+               .chain = command_subcommand_handlers,
+       },
+       COMMAND_REGISTRATION_DONE
+};
+
+struct command_context *command_init(const char *startup_tcl, Jim_Interp *interp)
 {
-       struct command_context* context = malloc(sizeof(struct command_context));
+       struct command_context *context = calloc(1, sizeof(struct command_context));
        const char *HostOs;
 
        context->mode = COMMAND_EXEC;
-       context->commands = NULL;
-       context->current_target = 0;
-       context->output_handler = NULL;
-       context->output_handler_priv = NULL;
-
-#if !BUILD_ECOSBOARD
-       Jim_InitEmbedded();
-       /* Create an interpreter */
-       interp = Jim_CreateInterp();
-       /* Add all the Jim core commands */
-       Jim_RegisterCoreCommands(interp);
-#endif
 
+       /* Create a jim interpreter if we were not handed one */
+       if (interp == NULL) {
+               /* Create an interpreter */
+               interp = Jim_CreateInterp();
+               /* Add all the Jim core commands */
+               Jim_RegisterCoreCommands(interp);
+               Jim_InitStaticExtensions(interp);
+       }
+
+       context->interp = interp;
+
+       /* Stick to lowercase for HostOS strings. */
 #if defined(_MSC_VER)
        /* WinXX - is generic, the forward
         * looking problem is this:
@@ -879,7 +1328,7 @@ struct command_context* command_init(const char *startup_tcl)
        HostOs = "winxx";
 #elif defined(__linux__)
        HostOs = "linux";
-#elif defined(__DARWIN__)
+#elif defined(__APPLE__) || defined(__DARWIN__)
        HostOs = "darwin";
 #elif defined(__CYGWIN__)
        HostOs = "cygwin";
@@ -887,154 +1336,128 @@ struct command_context* command_init(const char *startup_tcl)
        HostOs = "mingw32";
 #elif defined(__ECOS)
        HostOs = "ecos";
+#elif defined(__FreeBSD__)
+       HostOs = "freebsd";
+#elif defined(__NetBSD__)
+       HostOs = "netbsd";
+#elif defined(__OpenBSD__)
+       HostOs = "openbsd";
 #else
-#warn unrecognized host OS...
+#warning "Unrecognized host OS..."
        HostOs = "other";
 #endif
        Jim_SetGlobalVariableStr(interp, "ocd_HOSTOS",
-                       Jim_NewStringObj(interp, HostOs , strlen(HostOs)));
+               Jim_NewStringObj(interp, HostOs, strlen(HostOs)));
 
        Jim_CreateCommand(interp, "ocd_find", jim_find, NULL, NULL);
-       Jim_CreateCommand(interp, "echo", jim_echo, NULL, NULL);
        Jim_CreateCommand(interp, "capture", jim_capture, NULL, NULL);
 
-       /* Set Jim's STDIO */
-       interp->cookie_stdin = interp;
-       interp->cookie_stdout = interp;
-       interp->cookie_stderr = interp;
-       interp->cb_fwrite = openocd_jim_fwrite;
-       interp->cb_fread = openocd_jim_fread ;
-       interp->cb_vfprintf = openocd_jim_vfprintf;
-       interp->cb_fflush = openocd_jim_fflush;
-       interp->cb_fgets = openocd_jim_fgets;
-
-       COMMAND_REGISTER(context, NULL, "add_help_text",
-                       handle_help_add_command, COMMAND_ANY,
-                       "<command> [...] <help_text>] - "
-                       "add new command help text");
-
-#if !BUILD_ECOSBOARD
-       Jim_EventLoopOnLoad(interp);
-#endif
+       register_commands(context, NULL, command_builtin_handlers);
+
        Jim_SetAssocData(interp, "context", NULL, context);
-       if (Jim_Eval_Named(interp, startup_tcl, "embedded:startup.tcl",1) == JIM_ERR)
-       {
+       if (Jim_Eval_Named(interp, startup_tcl, "embedded:startup.tcl", 1) == JIM_ERR) {
                LOG_ERROR("Failed to run startup.tcl (embedded into OpenOCD)");
-               Jim_PrintErrorMessage(interp);
+               Jim_MakeErrorMessage(interp);
+               LOG_USER_N("%s", Jim_GetString(Jim_GetResult(interp), NULL));
                exit(-1);
        }
        Jim_DeleteAssocData(interp, "context");
 
-       COMMAND_REGISTER(context, NULL, "sleep",
-                       handle_sleep_command, COMMAND_ANY,
-                       "<n> [busy] - sleep for n milliseconds. "
-                       "\"busy\" means busy wait");
+       return context;
+}
 
-       COMMAND_REGISTER(context, NULL, "help",
-                       &handle_help_command, COMMAND_ANY,
-                       "[<command_name> ...] - show built-in command help");
+void command_exit(struct command_context *context)
+{
+       if (!context)
+               return;
 
-       return context;
+       Jim_FreeInterp(context->interp);
+       command_done(context);
 }
 
 int command_context_mode(struct command_context *cmd_ctx, enum command_mode mode)
 {
        if (!cmd_ctx)
-               return ERROR_INVALID_ARGUMENTS;
+               return ERROR_COMMAND_SYNTAX_ERROR;
 
        cmd_ctx->mode = mode;
        return ERROR_OK;
 }
 
-void process_jim_events(void)
+void process_jim_events(struct command_context *cmd_ctx)
 {
-#if !BUILD_ECOSBOARD
-       static int recursion = 0;
-
-       if (!recursion)
-       {
-               recursion++;
-               Jim_ProcessEvents (interp, JIM_ALL_EVENTS | JIM_DONT_WAIT);
-               recursion--;
-       }
-#endif
-}
-
-void register_jim(struct command_context *cmd_ctx, const char *name,
-               Jim_CmdProc cmd, const char *help)
-{
-       Jim_CreateCommand(interp, name, cmd, NULL, NULL);
-
-       Jim_Obj *cmd_list = Jim_NewListObj(interp, NULL, 0);
-       Jim_ListAppendElement(interp, cmd_list,
-                       Jim_NewStringObj(interp, name, -1));
+       static int recursion;
+       if (recursion)
+               return;
 
-       help_add_command(cmd_ctx, NULL, name, help);
+       recursion++;
+       Jim_ProcessEvents(cmd_ctx->interp, JIM_ALL_EVENTS | JIM_DONT_WAIT);
+       recursion--;
 }
 
 #define DEFINE_PARSE_NUM_TYPE(name, type, func, min, max) \
-       int parse##name(const char *str, type *ul) \
+       int parse ## name(const char *str, type * ul) \
        { \
-               if (!*str) \
-               { \
+               if (!*str) { \
                        LOG_ERROR("Invalid command argument"); \
                        return ERROR_COMMAND_ARGUMENT_INVALID; \
                } \
                char *end; \
                *ul = func(str, &end, 0); \
-               if (*end) \
-               { \
+               if (*end) { \
                        LOG_ERROR("Invalid command argument"); \
                        return ERROR_COMMAND_ARGUMENT_INVALID; \
                } \
-               if ((max == *ul) && (ERANGE == errno)) \
-               { \
-                       LOG_ERROR("Argument overflow"); \
-                       return ERROR_COMMAND_ARGUMENT_OVERFLOW; \
+               if ((max == *ul) && (ERANGE == errno)) { \
+                       LOG_ERROR("Argument overflow"); \
+                       return ERROR_COMMAND_ARGUMENT_OVERFLOW; \
                } \
-               if (min && (min == *ul) && (ERANGE == errno)) \
-               { \
+               if (min && (min == *ul) && (ERANGE == errno)) { \
                        LOG_ERROR("Argument underflow"); \
                        return ERROR_COMMAND_ARGUMENT_UNDERFLOW; \
                } \
                return ERROR_OK; \
        }
-DEFINE_PARSE_NUM_TYPE(_ulong, unsigned long , strtoul, 0, ULONG_MAX)
+DEFINE_PARSE_NUM_TYPE(_ulong, unsigned long, strtoul, 0, ULONG_MAX)
 DEFINE_PARSE_NUM_TYPE(_ullong, unsigned long long, strtoull, 0, ULLONG_MAX)
-DEFINE_PARSE_NUM_TYPE(_long, long , strtol, LONG_MIN, LONG_MAX)
+DEFINE_PARSE_NUM_TYPE(_long, long, strtol, LONG_MIN, LONG_MAX)
 DEFINE_PARSE_NUM_TYPE(_llong, long long, strtoll, LLONG_MIN, LLONG_MAX)
 
 #define DEFINE_PARSE_WRAPPER(name, type, min, max, functype, funcname) \
-       int parse##name(const char *str, type *ul) \
+       int parse ## name(const char *str, type * ul) \
        { \
                functype n; \
-               int retval = parse##funcname(str, &n); \
-               if (ERROR_OK != retval) \
+               int retval = parse ## funcname(str, &n); \
+               if (ERROR_OK != retval) \
                        return retval; \
                if (n > max) \
-                       return ERROR_COMMAND_ARGUMENT_OVERFLOW; \
+                       return ERROR_COMMAND_ARGUMENT_OVERFLOW; \
                if (min) \
                        return ERROR_COMMAND_ARGUMENT_UNDERFLOW; \
                *ul = n; \
                return ERROR_OK; \
        }
 
-#define DEFINE_PARSE_ULONG(name, type, min, max) \
-       DEFINE_PARSE_WRAPPER(name, type, min, max, unsigned long, _ulong)
-DEFINE_PARSE_ULONG(_uint, unsigned, 0, UINT_MAX)
-DEFINE_PARSE_ULONG(_u32, uint32_t, 0, UINT32_MAX)
-DEFINE_PARSE_ULONG(_u16, uint16_t, 0, UINT16_MAX)
-DEFINE_PARSE_ULONG(_u8, uint8_t, 0, UINT8_MAX)
+#define DEFINE_PARSE_ULONGLONG(name, type, min, max) \
+       DEFINE_PARSE_WRAPPER(name, type, min, max, unsigned long long, _ullong)
+DEFINE_PARSE_ULONGLONG(_uint, unsigned, 0, UINT_MAX)
+DEFINE_PARSE_ULONGLONG(_u64,  uint64_t, 0, UINT64_MAX)
+DEFINE_PARSE_ULONGLONG(_u32,  uint32_t, 0, UINT32_MAX)
+DEFINE_PARSE_ULONGLONG(_u16,  uint16_t, 0, UINT16_MAX)
+DEFINE_PARSE_ULONGLONG(_u8,   uint8_t,  0, UINT8_MAX)
+
+DEFINE_PARSE_ULONGLONG(_target_addr, target_addr_t, 0, TARGET_ADDR_MAX)
 
-#define DEFINE_PARSE_LONG(name, type, min, max) \
-       DEFINE_PARSE_WRAPPER(name, type, min, max, long, _long)
-DEFINE_PARSE_LONG(_int, int, n < INT_MIN, INT_MAX)
-DEFINE_PARSE_LONG(_s32, int32_t, n < INT32_MIN, INT32_MAX)
-DEFINE_PARSE_LONG(_s16, int16_t, n < INT16_MIN, INT16_MAX)
-DEFINE_PARSE_LONG(_s8, int8_t, n < INT8_MIN, INT8_MAX)
+#define DEFINE_PARSE_LONGLONG(name, type, min, max) \
+       DEFINE_PARSE_WRAPPER(name, type, min, max, long long, _llong)
+DEFINE_PARSE_LONGLONG(_int, int,     n < INT_MIN,   INT_MAX)
+DEFINE_PARSE_LONGLONG(_s64, int64_t, n < INT64_MIN, INT64_MAX)
+DEFINE_PARSE_LONGLONG(_s32, int32_t, n < INT32_MIN, INT32_MAX)
+DEFINE_PARSE_LONGLONG(_s16, int16_t, n < INT16_MIN, INT16_MAX)
+DEFINE_PARSE_LONGLONG(_s8,  int8_t,  n < INT8_MIN,  INT8_MAX)
 
 static int command_parse_bool(const char *in, bool *out,
-               const char *on, const char *off)
+       const char *on, const char *off)
 {
        if (strcasecmp(in, on) == 0)
                *out = true;
@@ -1042,7 +1465,7 @@ static int command_parse_bool(const char *in, bool *out,
                *out = false;
        else
                return ERROR_COMMAND_SYNTAX_ERROR;
-       return  ERROR_OK;
+       return ERROR_OK;
 }
 
 int command_parse_bool_arg(const char *in, bool *out)
@@ -1057,26 +1480,25 @@ int command_parse_bool_arg(const char *in, bool *out)
                return ERROR_OK;
        if (command_parse_bool(in, out, "1", "0") == ERROR_OK)
                return ERROR_OK;
-       return ERROR_INVALID_ARGUMENTS;
+       return ERROR_COMMAND_SYNTAX_ERROR;
 }
 
 COMMAND_HELPER(handle_command_parse_bool, bool *out, const char *label)
 {
        switch (CMD_ARGC) {
-       case 1: {
-               const char *in = CMD_ARGV[0];
-               if (command_parse_bool_arg(in, out) != ERROR_OK)
-               {
-                       LOG_ERROR("%s: argument '%s' is not valid", CMD_NAME, in);
-                       return ERROR_INVALID_ARGUMENTS;
+               case 1: {
+                       const char *in = CMD_ARGV[0];
+                       if (command_parse_bool_arg(in, out) != ERROR_OK) {
+                               LOG_ERROR("%s: argument '%s' is not valid", CMD_NAME, in);
+                               return ERROR_COMMAND_SYNTAX_ERROR;
+                       }
                }
-               // fall through
-       }
-       case 0:
-               LOG_INFO("%s is %s", label, *out ? "enabled" : "disabled");
-               break;
-       default:
-               return ERROR_INVALID_ARGUMENTS;
+                       /* fallthrough */
+               case 0:
+                       LOG_INFO("%s is %s", label, *out ? "enabled" : "disabled");
+                       break;
+               default:
+                       return ERROR_COMMAND_SYNTAX_ERROR;
        }
        return ERROR_OK;
 }

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