gdb_server: support gdb target description

* Add a parameter in .get_gdb_reg_list() to return different
  register lists as generating target description.
* Modify STRUCT REG to let gdb generate target description
  according to register information.

The modified structure of register is
struct reg {
        const char *name;
        uint32_t number;  /* for regnum="num" */
        struct reg_feature *feature;  /* for register group feature name */
        bool caller_save;  /* for save-restore="yes|no" */
        void *value;
        bool dirty;
        bool valid;
        bool exist;
        uint32_t size;
        struct reg_data_type *reg_data_type;  /* for type="type" */
        const char *group;  /* for group="general|float|vector" */
        void *arch_info;
        const struct reg_arch_type *type;
};

Change-Id: I2096b67adf94518ba0b8b23d8c6a9f64ad7932b8
Signed-off-by: Hsiangkai Wang <hsiangkai@gmail.com>
Reviewed-on: http://openocd.zylin.com/1382
Tested-by: jenkins
Reviewed-by: Franck Jullien <franck.jullien@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/src/target/register.h b/src/target/register.h
index 3810d14..9e0f1ce 100644
--- a/src/target/register.h
+++ b/src/target/register.h
@@ -26,12 +26,105 @@
 
 struct target;
 
+enum reg_type {
+	REG_TYPE_INT8,
+	REG_TYPE_INT16,
+	REG_TYPE_INT32,
+	REG_TYPE_INT64,
+	REG_TYPE_INT128,
+	REG_TYPE_UINT8,
+	REG_TYPE_UINT16,
+	REG_TYPE_UINT32,
+	REG_TYPE_UINT64,
+	REG_TYPE_UINT128,
+	REG_TYPE_CODE_PTR,
+	REG_TYPE_DATA_PTR,
+	REG_TYPE_IEEE_SINGLE,
+	REG_TYPE_IEEE_DOUBLE,
+	REG_TYPE_ARCH_DEFINED,
+};
+
+struct reg_feature {
+	const char *name;
+};
+
+struct reg_data_type_vector {
+	struct reg_data_type *type;
+	uint32_t count;
+};
+
+struct reg_data_type_union_field {
+	const char *name;
+	struct reg_data_type *type;
+	struct reg_data_type_union_field *next;
+};
+
+struct reg_data_type_union {
+	struct reg_data_type_union_field *fields;
+};
+
+struct reg_data_type_bitfield {
+	uint32_t start;
+	uint32_t end;
+};
+
+struct reg_data_type_struct_field {
+	const char *name;
+	bool use_bitfields;
+	union {
+		struct reg_data_type_bitfield *bitfield;
+		struct reg_data_type *type;
+	};
+	struct reg_data_type_struct_field *next;
+};
+
+struct reg_data_type_struct {
+	uint32_t size;
+	struct reg_data_type_struct_field *fields;
+};
+
+struct reg_data_type_flags_field {
+	const char *name;
+	struct reg_data_type_bitfield *bitfield;
+	struct reg_data_type_flags_field *next;
+};
+
+struct reg_data_type_flags {
+	uint32_t size;
+	struct reg_data_type_flags_field *fields;
+};
+
+enum reg_data_type_class {
+	REG_TYPE_CLASS_VECTOR,
+	REG_TYPE_CLASS_UNION,
+	REG_TYPE_CLASS_STRUCT,
+	REG_TYPE_CLASS_FLAGS,
+};
+
+struct reg_data_type {
+	enum reg_type type;
+	const char *id;
+	enum reg_data_type_class type_class;
+	union {
+		struct reg_data_type_vector *reg_type_vector;
+		struct reg_data_type_union *reg_type_union;
+		struct reg_data_type_struct *reg_type_struct;
+		struct reg_data_type_flags *reg_type_flags;
+	};
+};
+
 struct reg {
 	const char *name;
+	uint32_t number;
+	struct reg_feature *feature;
+	bool caller_save;
 	void *value;
 	bool dirty;
 	bool valid;
+	bool exist;
 	uint32_t size;
+	struct reg_data_type *reg_data_type;
+	const char *group;
 	void *arch_info;
 	const struct reg_arch_type *type;
 };