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>

4 files changed, 95 insertions, 1 deletions

diff --git a/contrib/loaders/Makefile b/contrib/loaders/Makefile
index 31cccb5f..a9a27706 100644
--- a/contrib/loaders/Makefile
+++ b/contrib/loaders/Makefile
@@ -1,6 +1,6 @@
 .PHONY: arm clean-arm
 
-all: arm
+all: arm stm8
 
 common_dirs = \
 	checksum \
@@ -32,3 +32,6 @@ clean: clean-arm
 	for d in $(common_dirs); do \
 		$(MAKE) -C $$d clean; \
 	done
+
+stm8:
+	$(MAKE) -C erase_check stm8
diff --git a/contrib/loaders/erase_check/Makefile b/contrib/loaders/erase_check/Makefile
index 01e62dea..427fa0c0 100644
--- a/contrib/loaders/erase_check/Makefile
+++ b/contrib/loaders/erase_check/Makefile
@@ -6,6 +6,12 @@ ARM_OBJCOPY ?= $(ARM_CROSS_COMPILE)objcopy
 
 ARM_AFLAGS = -EL
 
+STM8_CROSS_COMPILE ?= stm8-
+STM8_AS      ?= $(STM8_CROSS_COMPILE)as
+STM8_OBJCOPY ?= $(STM8_CROSS_COMPILE)objcopy
+
+STM8_AFLAGS =
+
 arm: armv4_5_erase_check.inc armv7m_erase_check.inc armv7m_0_erase_check.inc
 
 armv4_5_%.elf: armv4_5_%.s
@@ -26,5 +32,16 @@ armv7m_%.bin: armv7m_%.elf
 armv7m_%.inc: armv7m_%.bin
 	$(BIN2C) < $< > $@
 
+stm8: stm8_erase_check.inc
+
+stm8_%.elf: stm8_%.s
+	$(STM8_AS) $(STM8_AFLAGS) $< -o $@
+
+stm8_%.bin: stm8_%.elf
+	$(STM8_OBJCOPY) -Obinary $< $@
+
+stm8_%.inc: stm8_%.bin
+	$(BIN2C) < $< > $@
+
 clean:
 	-rm -f *.elf *.bin *.inc
diff --git a/contrib/loaders/erase_check/stm8_erase_check.inc b/contrib/loaders/erase_check/stm8_erase_check.inc
new file mode 100644
index 00000000..66b4ec7f
--- /dev/null
+++ b/contrib/loaders/erase_check/stm8_erase_check.inc
@@ -0,0 +1,5 @@
+/* Autogenerated with ../../../src/helper/bin2char.sh */
+0x00,0x80,0x00,0x00,0x80,0x00,0x96,0xcf,0x00,0x22,0x1e,0x01,0x16,0x04,0xa6,0xff,
+0x90,0x5d,0x26,0x04,0x0d,0x03,0x27,0x17,0x90,0x5d,0x26,0x02,0x0a,0x03,0x90,0x5a,
+0x92,0xbc,0x00,0x00,0xa1,0xff,0x26,0x07,0x5c,0x26,0xe5,0x0c,0x00,0x20,0xe1,0x1f,
+0x01,0x17,0x04,0x8b,
diff --git a/contrib/loaders/erase_check/stm8_erase_check.s b/contrib/loaders/erase_check/stm8_erase_check.s
new file mode 100644
index 00000000..62694006
--- /dev/null
+++ b/contrib/loaders/erase_check/stm8_erase_check.s
@@ -0,0 +1,69 @@
+/*
+    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/>.
+*/
+;;
+;; erase check memory code
+;;
+ .org 0x0
+;; start address
+ start_addr: .byte 0x00
+       .word 0x8000
+;; byte count
+ byte_cnt: .byte 0x00
+       .word 0x8000
+;
+; SP must point to start_addr on entry
+; first relocate start_addr to the location
+; we are running at
+start:
+	ldw X,SP
+	ldw .cont+2,X
+	ldw X,(start_addr+1,SP)	;start addr
+	ldw Y,(byte_cnt+1,SP)	;count
+	ld A,#0xff
+;
+; if count == 0 return
+.L1:
+	tnzw Y
+	jrne .decrcnt	;continue if low word != 0
+	tnz (byte_cnt,SP)	;high byte
+	jreq .exit	;goto exit
+;
+; decrement count (byte_cnt)
+.decrcnt:
+	tnzw Y	;low word count
+	jrne .decr1
+	dec (byte_cnt,SP)	;high byte
+.decr1:
+	decw Y;	decr low word
+;
+; first check if [start_addr] is 0xff
+.cont:
+	ldf A, [start_addr.e]
+	cp A,#0xff
+	jrne .exit ;exit if not 0xff
+;
+; increment start_addr (addr)
+	incw X
+	jrne .L1
+	inc (start_addr,SP)	;increment high byte
+	jra .L1
+;
+.exit:
+	ldw (start_addr+1,SP),X	;start addr
+	ldw (byte_cnt+1,SP),Y	;count
+	break