stm8 : new target

New STM8 target based mostly on mips4k. Target communication
through STLINK/SWIM. No flash driver yet but it is still possible
to program flash through load_image command. The usual target debug
methods are implemented.

Change-Id: I7216f231d3ac7c70cae20f1cd8463c2ed864a329
Signed-off-by: Ake Rehnman <ake.rehnman@gmail.com>
Reviewed-on: http://openocd.zylin.com/3953
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

src/target/Makefile.am

@@ -19,6 +19,7 @@ noinst_LTLIBRARIES += %D%/libtarget.la
 	$(AVR32_SRC) \
 	$(MIPS32_SRC) \
 	$(NDS32_SRC) \
+	$(STM8_SRC) \
 	$(INTEL_IA32_SRC) \
 	%D%/avrt.c \
 	%D%/dsp563xx.c \
@@ -124,6 +125,9 @@ NDS32_SRC = \
 	%D%/nds32_v3m.c \
 	%D%/nds32_aice.c
 
+STM8_SRC = \
+	%D%/stm8.c
+
 INTEL_IA32_SRC = \
 	%D%/quark_x10xx.c \
 	%D%/quark_d20xx.c \
@@ -205,6 +209,7 @@ INTEL_IA32_SRC = \
 	%D%/nds32_v3.h \
 	%D%/nds32_v3m.h \
 	%D%/nds32_aice.h \
+	%D%/stm8.h \
 	%D%/lakemont.h \
 	%D%/x86_32_common.h \
 	%D%/arm_cti.h

src/target/stm8.h

@@ -0,0 +1,75 @@
+/*
+    OpenOCD STM8 target driver
+    Copyright (C) 2017  Ake Rehnman
+    ake.rehnman(at)gmail.com
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef OPENOCD_TARGET_STM8_H
+#define OPENOCD_TARGET_STM8_H
+
+struct target;
+
+#define STM8_COMMON_MAGIC	0x53544D38
+#define STM8_NUM_CORE_REGS 6
+
+struct stm8_common {
+	uint32_t common_magic;
+	void *arch_info;
+	struct reg_cache *core_cache;
+	uint32_t core_regs[STM8_NUM_CORE_REGS];
+
+	/* working area for fastdata access */
+	struct working_area *fast_data_area;
+
+	bool swim_configured;
+	bool bp_scanned;
+	uint8_t num_hw_bpoints;
+	uint8_t num_hw_bpoints_avail;
+	struct stm8_comparator *hw_break_list;
+	uint32_t blocksize;
+	uint32_t flashstart;
+	uint32_t flashend;
+	uint32_t eepromstart;
+	uint32_t eepromend;
+	uint32_t optionstart;
+	uint32_t optionend;
+	bool enable_step_irq;
+
+	bool enable_stm8l;
+	uint32_t flash_cr2;
+	uint32_t flash_ncr2;
+	uint32_t flash_iapsr;
+	uint32_t flash_dukr;
+	uint32_t flash_pukr;
+
+	/* cc value used for interrupt flags restore */
+	uint32_t cc;
+	bool cc_valid;
+
+	/* register cache to processor synchronization */
+	int (*read_core_reg)(struct target *target, unsigned int num);
+	int (*write_core_reg)(struct target *target, unsigned int num);
+};
+
+static inline struct stm8_common *
+target_to_stm8(struct target *target)
+{
+	return target->arch_info;
+}
+
+const struct command_registration stm8_command_handlers[];
+
+#endif /* OPENOCD_TARGET_STM8_H */

src/target/target.c

@@ -105,6 +105,7 @@ extern struct target_type nds32_v3m_target;
 extern struct target_type or1k_target;
 extern struct target_type quark_x10xx_target;
 extern struct target_type quark_d20xx_target;
+extern struct target_type stm8_target;
 
 static struct target_type *target_types[] = {
 	&arm7tdmi_target,
@@ -136,6 +137,7 @@ static struct target_type *target_types[] = {
 	&or1k_target,
 	&quark_x10xx_target,
 	&quark_d20xx_target,
+	&stm8_target,
 #if BUILD_TARGET64
 	&aarch64_target,
 #endif