rtos: Fix regression preventing use of first RTOS & clean up rtos_qsymbol()

ThreadX support was not working due to it being first in the list of RTOS - regression.
Auto-detect off, an RTOS was always be marked as successfully detected, even if symbols are not found.
Lines 223-227 were unnecessary as they are done in rtos_try_next()
Added lots of comments
Improved readability by separating: GDB not finding a symbol vs no more symbols being available

Regression caused by patch which was allowed only 52 minutes for review : http://openocd.zylin.com/895

Change-Id: Ib4decb01db595ddb3796837c6d8338ce6b9a91ca
Signed-off-by: Evan Hunter <ehunter@broadcom.com>
Reviewed-on: http://openocd.zylin.com/986
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>

diff --git a/src/rtos/rtos.c b/src/rtos/rtos.c
index 28bbe5ee169072668bc4e1b62c6e8ea243c04ca3..61fc7936ff20f4a0f3f0c173e27e8ccb05baf731 100644 (file)
--- a/src/rtos/rtos.c
+++ b/src/rtos/rtos.c
@@ -199,13 +199,30 @@ int rtos_qsymbol(struct connection *connection, char *packet, int packet_size)
        if (!os)
                goto done;
 
-       if (sscanf(packet, "qSymbol:%" SCNx64 ":", &addr))
-               hex_to_str(cur_sym, strchr(packet + 8, ':') + 1);
-       else if (target->rtos_auto_detect && !rtos_try_next(target))
-               goto done;
+       /* Decode any symbol name in the packet*/
+       hex_to_str(cur_sym, strchr(packet + 8, ':') + 1);
+
+       if ((strcmp(packet, "qSymbol::") != 0) &&               /* GDB is not offering symbol lookup for the first time */
+           (!sscanf(packet, "qSymbol:%" SCNx64 ":", &addr))) { /* GDB did not found an address for a symbol */
+               /* GDB could not find an address for the previous symbol */
+               if (!target->rtos_auto_detect) {
+                       LOG_WARNING("RTOS %s not detected. (GDB could not find symbol \'%s\')", os->type->name, cur_sym);
+                       goto done;
+               } else {
+                       /* Autodetecting RTOS - try next RTOS */
+                       if (!rtos_try_next(target))
+                               goto done;
 
+                       /* Next RTOS selected - invalidate current symbol */
+                       cur_sym[0] = '\x00';
+
+               }
+       }
        next_sym = next_symbol(os, cur_sym, addr);
+
        if (!next_sym) {
+               /* No more symbols need looking up */
+
                if (!target->rtos_auto_detect) {
                        rtos_detected = 1;
                        goto done;
@@ -215,16 +232,10 @@ int rtos_qsymbol(struct connection *connection, char *packet, int packet_size)
                        LOG_OUTPUT("Auto-detected RTOS: %s\r\n", os->type->name);
                        rtos_detected = 1;
                        goto done;
-               }
-
-               if (!rtos_try_next(target))
-                       goto done;
-
-               os->type->get_symbol_list_to_lookup(&os->symbols);
-
-               next_sym = os->symbols[0].symbol_name;
-               if (!next_sym)
+               } else {
+                       LOG_WARNING("No RTOS could be auto-detected!");
                        goto done;
+               }
        }
 
        if (8 + (strlen(next_sym) * 2) + 1 > sizeof(reply)) {