target/arm926ejs: fix memory leaks

The memory leaks detected and fixed are:
- arm register cache;
- EmbeddedICE register cache;
- arm_jtag_reset_callback internal data;
- struct arm926ejs_common.

Issue identified with valgrind.
Tested on SPEAr320 based on arm926ejs.

Change-Id: If2bed02c516051ce4d0eb29b204a3f3337fe5d6a
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5698
Tested-by: jenkins

src/target/arm7_9_common.c

@@ -2682,6 +2682,15 @@ int arm7_9_examine(struct target *target)
 	return retval;
 }
 
+void arm7_9_deinit(struct target *target)
+{
+	struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
+
+	if (target_was_examined(target))
+		embeddedice_free_reg_cache(arm7_9->eice_cache);
+
+	arm_jtag_close_connection(&arm7_9->jtag_info);
+}
 
 int arm7_9_check_reset(struct target *target)
 {

src/target/arm7_9_common.h

@@ -186,6 +186,7 @@ int arm7_9_execute_sys_speed(struct target *target);
 
 int arm7_9_init_arch_info(struct target *target, struct arm7_9_common *arm7_9);
 int arm7_9_examine(struct target *target);
+void arm7_9_deinit(struct target *target);
 int arm7_9_check_reset(struct target *target);
 
 int arm7_9_endianness_callback(jtag_callback_data_t pu8_in,

src/target/arm926ejs.c

@@ -723,6 +723,16 @@ static int arm926ejs_target_create(struct target *target, Jim_Interp *interp)
 	return arm926ejs_init_arch_info(target, arm926ejs, target->tap);
 }
 
+void arm926ejs_deinit_target(struct target *target)
+{
+	struct arm *arm = target_to_arm(target);
+	struct arm926ejs_common *arm926ejs = target_to_arm926(target);
+
+	arm7_9_deinit(target);
+	arm_free_reg_cache(arm);
+	free(arm926ejs);
+}
+
 COMMAND_HANDLER(arm926ejs_handle_cache_info_command)
 {
 	int retval;
@@ -823,6 +833,7 @@ struct target_type arm926ejs_target = {
 	.commands = arm926ejs_command_handlers,
 	.target_create = arm926ejs_target_create,
 	.init_target = arm9tdmi_init_target,
+	.deinit_target = arm926ejs_deinit_target,
 	.examine = arm7_9_examine,
 	.check_reset = arm7_9_check_reset,
 	.virt2phys = arm926ejs_virt2phys,

src/target/arm_jtag.c

@@ -92,3 +92,8 @@ int arm_jtag_setup_connection(struct arm_jtag *jtag_info)
 
 	return jtag_register_event_callback(arm_jtag_reset_callback, jtag_info);
 }
+
+int arm_jtag_close_connection(struct arm_jtag *jtag_info)
+{
+	return jtag_unregister_event_callback(arm_jtag_reset_callback, jtag_info);
+}

src/target/arm_jtag.h

@@ -61,6 +61,7 @@ static inline int arm_jtag_scann(struct arm_jtag *jtag_info, uint32_t new_scan_c
 }
 
 int arm_jtag_setup_connection(struct arm_jtag *jtag_info);
+int arm_jtag_close_connection(struct arm_jtag *jtag_info);
 
 /* use this as a static so we can inline it in -O3 and refer to it via a pointer  */
 static inline void arm7flip32(jtag_callback_data_t arg)

src/target/embeddedice.c

@@ -303,6 +303,22 @@ struct reg_cache *embeddedice_build_reg_cache(struct target *target,
 	return reg_cache;
 }
 
+/**
+ * Free all memory allocated for EmbeddedICE register cache
+ */
+void embeddedice_free_reg_cache(struct reg_cache *reg_cache)
+{
+	if (!reg_cache)
+		return;
+
+	for (unsigned int i = 0; i < reg_cache->num_regs; i++)
+		free(reg_cache->reg_list[i].value);
+
+	free(reg_cache->reg_list[0].arch_info);
+	free(reg_cache->reg_list);
+	free(reg_cache);
+}
+
 /**
  * Initialize EmbeddedICE module, if needed.
  */

src/target/embeddedice.h

@@ -88,6 +88,7 @@ struct embeddedice_reg {
 
 struct reg_cache *embeddedice_build_reg_cache(struct target *target,
 		struct arm7_9_common *arm7_9);
+void embeddedice_free_reg_cache(struct reg_cache *reg_cache);
 
 int embeddedice_setup(struct target *target);