ARC: add private register_get_by_name function

In ARC case we have TCL function arc_set_reg_exists to mark register as existing.
In this function register_get_by_name() is called, which currently skips
register, if it is not existing. Thats why we introduce private version without
existance check.

Commit is based on:
zephyrproject-rtos/openocd@5b23e3b

Signed-off-by: Evgeniy Didin <didin@synopsys.com>

src/target/arc.c

@@ -38,6 +38,35 @@ void arc_add_reg_data_type(struct target *target,
  list_add_tail(&data_type->list, &arc->reg_data_types);
 }
 
+/* ----- Exported functions ------------------------------------------------ */
+
+/**
+ * Private implementation of register_get_by_name() for ARC that
+ * doesn't skip not [yet] existing registers. Used in many places
+ * for iteration through registers and even for marking required registers as
+ * existing.
+ */
+struct reg *arc32_register_get_by_name(struct reg_cache *first,
+ const char *name, bool search_all)
+{
+ unsigned i;
+ struct reg_cache *cache = first;
+
+ while (cache) {
+ for (i = 0; i < cache->num_regs; i++) {
+ if (strcmp(cache->reg_list[i].name, name) == 0)
+ return &(cache->reg_list[i]);
+ }
+
+ if (search_all)
+ cache = cache->next;
+ else
+ break;
+ }
+
+ return NULL;
+}
+
 
 /* Initialize arc_common structure, which passes to openocd target instance */
 int arc_init_arch_info(struct target *target, struct arc_common *arc,

src/target/arc.h

@@ -216,4 +216,8 @@ int arc_add_reg(struct target *target, struct arc_reg_desc *arc_reg,
 int arc_build_reg_cache(struct target *target);
 int arc_build_bcr_reg_cache(struct target *target);
 
+
+struct reg *arc32_register_get_by_name(struct reg_cache *first,
+ const char *name, bool search_all);
+
 #endif /* ARC_H */