target: cortex_m: fix segfault with HLA

The HLA target shares an examine handler with cortex_m but since it
lacks direct access to DAP, some operations need to be omitted.

Change-Id: Ifdd9d3da4a3a3c2e1c9721284b21d041b3ccaa7a
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/3183
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

diff --git a/src/target/cortex_m.c b/src/target/cortex_m.c
index d539a8241667c9e55f18e6524b4795e8d3a8cca3..6786c46c97e9d6a90dced8112174a9d19d0c2ec7 100644 (file)
--- a/src/target/cortex_m.c
+++ b/src/target/cortex_m.c
@@ -1891,25 +1891,25 @@ int cortex_m_examine(struct target *target)
        struct adiv5_dap *swjdp = cortex_m->armv7m.arm.dap;
        struct armv7m_common *armv7m = target_to_armv7m(target);
 
-       retval = dap_dp_init(swjdp);
-       if (retval != ERROR_OK) {
-               LOG_ERROR("Could not initialize the debug port");
-               return retval;
-       }
-
-       /* Search for the MEM-AP */
-       retval = dap_find_ap(swjdp, AP_TYPE_AHB_AP, &armv7m->debug_ap);
-       if (retval != ERROR_OK) {
-               LOG_ERROR("Could not find MEM-AP to control the core");
-               return retval;
-       }
-
-       /* Leave (only) generic DAP stuff for debugport_init(); */
-       armv7m->debug_ap->memaccess_tck = 8;
-
        /* stlink shares the examine handler but does not support
         * all its calls */
        if (!armv7m->stlink) {
+               retval = dap_dp_init(swjdp);
+               if (retval != ERROR_OK) {
+                       LOG_ERROR("Could not initialize the debug port");
+                       return retval;
+               }
+
+               /* Search for the MEM-AP */
+               retval = dap_find_ap(swjdp, AP_TYPE_AHB_AP, &armv7m->debug_ap);
+               if (retval != ERROR_OK) {
+                       LOG_ERROR("Could not find MEM-AP to control the core");
+                       return retval;
+               }
+
+               /* Leave (only) generic DAP stuff for debugport_init(); */
+               armv7m->debug_ap->memaccess_tck = 8;
+
                retval = mem_ap_init(armv7m->debug_ap);
                if (retval != ERROR_OK)
                        return retval;
@@ -1959,7 +1959,7 @@ int cortex_m_examine(struct target *target)
                        armv7m->arm.core_cache->num_regs = ARMV7M_NUM_CORE_REGS_NOFP;
                }
 
-               if (i == 4 || i == 3) {
+               if ((i == 4 || i == 3) && !armv7m->stlink) {
                        /* Cortex-M3/M4 has 4096 bytes autoincrement range */
                        armv7m->debug_ap->tar_autoincr_block = (1 << 12);
                }