From b0e61a103125d4eee18c802d4b5612d13722c564 Mon Sep 17 00:00:00 2001
From: Robin Krens <robin@robinkrens.nl>
Date: Tue, 7 Jun 2022 21:55:39 +0200
Subject: [PATCH] refactor: use for ia86-elf-gcc toolchain + linker file

- use of gas style assembly in entry.S
	- copy to RAM func
	- jump to C
- main.c tests for .bss (global) and .data data
- makefile changes for toolchain
- added swan.ld linker file to make layout sections easier
---
 Makefile    |  60 +++++++++-------
 romheader   | Bin 0 -> 17200 bytes
 src/entry.S |  54 +++++++++++++++
 src/init.s  | 222 ------------------------------------------------------------
 src/main.c  | 122 ++++++++++-----------------------
 swan.ld     |  26 +++++++
 6 files changed, 150 insertions(+), 334 deletions(-)
 create mode 100755 romheader
 create mode 100644 src/entry.S
 delete mode 100644 src/init.s
 create mode 100644 swan.ld

diff --git a/Makefile b/Makefile
index de9a494..f949274 100644
--- a/Makefile
+++ b/Makefile
@@ -1,31 +1,39 @@
-# simple makefile
-INC=./inc
-CC=bcc
-LD=ld86
-AS=nasm
-MED=mednafen
-
-#$(LD) -M src/*.o
-
-# -d delete headers
-# -s strip symbols
-all:
-	$(LD) -T0x0 -D0xF000 src/*.o -d -s -o test.wsc
-
-# use -x to for -ffreestanding
-c-files:
-	$(CC) -0 -c src/*.c -I$(INC)
-init:
-	$(AS) -fas86 src/*.s -i $(INC)
+#
+# makefile for swan-sdk
+#
 
-add:
-	cp test.wsc tools/
-	cd tools && ./romheader
+OUT = test.wsc
+CC = ia16-elf-gcc
+LD = ia16-elf-ld
+ODIR = obj
+ADIR = objs
+SDIR = src
+INC = -Iinc
 
-run:
-	$(MED) tools/test.wsc
+CFLAGS = -march=v30 -ffreestanding # use NEC v30 chip
 
-clean:
-	rm -rf src/*.o test.wsc
+_OBJS = entry.o main.o # todo: make sure entry is forced as entry point for linker
+
+OBJS = $(patsubst %,$(ODIR)/%,$(_OBJS))
+
+LDFILE = swan.ld
+
+
+$(ODIR)/%.o: $(SDIR)/%.c
+	$(CC) -c $(INC) -o $@ $< $(CFLAGS)
 
+$(ODIR)/entry.o: $(SDIR)/entry.S
+	$(CC) -c $(INC) -o $@ $< $(CFLAGS)
 
+$(OUT): $(OBJS)
+	$(LD) -T $(LDFILE) $^ -o $(OUT)
+
+add:
+	./romheader
+run:
+	mednafen test.wsc
+
+.PHONY: clean
+
+clean:
+	rm -f $(ODIR)/*.o $(OUT)
diff --git a/romheader b/romheader
new file mode 100755
index 0000000000000000000000000000000000000000..19a4bafd81b2d40885585dc08cdb479dbdcd3a86
GIT binary patch
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diff --git a/src/entry.S b/src/entry.S
new file mode 100644
index 0000000..e1393e5
--- /dev/null
+++ b/src/entry.S
@@ -0,0 +1,54 @@
+# File              : entry.S
+# Author            : Robin Krens <robin@robinkrens.nl>
+# Date              : 07.06.2022
+# Last Modified Date: 07.06.2022
+# Last Modified By  : Robin Krens <robin@robinkrens.nl>
+
+.org	0
+.code16
+
+.extern	main
+.extern _stext
+.extern _etext
+.extern _sdata
+.extern _edata
+.global _start
+
+_start:
+	# reset flags and registers
+	cli
+	cld
+	xor %ax,%ax
+	mov %ax,%bx
+	mov %ax,%bp
+	mov %ax,%ss
+	
+	# set stack pointer for wonderswan
+	# color
+	mov $0xFE00 - 2,%ax
+	mov %ax,%sp
+	
+copy_to_ram:
+	mov $_etext, %ax
+	# set data segment to ROM bank
+	mov $0x2000, %bx
+	mov %bx, %ds
+	mov %ax, %si
+	mov $_sdata, %bx
+	mov %bx, %di
+	# calculate size
+	mov $_edata, %ax
+	mov $_sdata, %bx
+	sub %bx, %ax
+	mov %ax, %cx
+	rep movsb
+	# reset data segment to RAM
+	xor %ax, %ax
+	mov %ax, %ds
+
+	# jump to C
+	call main
+
+	# should not be here
+loop:	nop
+	jmp loop
diff --git a/src/init.s b/src/init.s
deleted file mode 100644
index cb1bb03..0000000
--- a/src/init.s
+++ /dev/null
@@ -1,222 +0,0 @@
-
-%include "WonderSwan.inc"
-
-extern	_main
-extern 	_test_copy
-extern 	__etext
-extern	__seg1DL
-extern	__seg1DH
-extern 	__edata
-extern 	__end
-
-MYSEGMENT	equ	0xF000
-USER_RAM	equ 	0x1000
-
-; Set Maps and Sprite Table at the end of first part of ram
-fgmap		equ	WSC_TILE_BANK1-MAP_SIZE
-bgmap		equ	fgmap-MAP_SIZE
-sprtable	equ	bgmap-SPR_TABLE_SIZE
-
-
-	cpu	186
-	bits	16
-
-	;PADDING	15		; Pad 15 Sections
-
-	section .text
-
-	;ORG	0x0000
-
-..start:
-	cli			; Disable Interrupts
-	cld			; Offset in Increment mode
-
-	xor	ax,ax		; Clear all registers
-	mov	bx,ax
-	mov	cx,ax
-	mov	dx,ax
-	mov	si,ax
-	mov	di,ax
-	mov	ds,ax		; Clear Segments
-	mov	es,ax
-	
-	mov	bp,ax		; Setup stack
-	mov	ss,ax
-	mov	sp,WS_STACK
-
-	in	al,IO_HARDWARE_TYPE	; Check Wonderswan Mono/Color
-	test	al,WS_COLOR 
-.mono:	jz	.mono		; We loop forever if Mono
-
-	mov	sp,WSC_STACK	; New stack
-	
-	;call	_main
-
-	xor	ax,ax		; Clear Ram
-	mov	di,0x100
-	mov	cx,0x7E80
-	rep	stosw
-
-	out	IO_SRAM_BANK,al
-
-
-	;mov	cx, 0x100
-
-	; Video Init
-	in	al,IO_VIDEO_MODE
-	or	al,VMODE_16C_CHK | VMODE_CLEANINIT
-	out	IO_VIDEO_MODE,al
-
-	xor	ax,ax
-
-	out	IO_BG_X,al
-	out	IO_BG_Y,al
-	out	IO_FG_X,al
-	out	IO_FG_Y,al
-
-	out	IO_SPR_START,al
-	out	IO_SPR_STOP,al
-
-	mov	al,BG_MAP(bgmap) | FG_MAP(fgmap)
-	out	IO_FGBG_MAP,al
-
-	mov	al,SPR_TABLE(sprtable)
-	out	IO_SPR_TABLE,al
-
-	in	al,IO_LCD_CTRL
-	or	al,LCD_ON
-	out	IO_LCD_CTRL,al
-
-	xor	al,al
-	out	IO_LCD_ICONS,al
-
-	; Setup VBlank Int
-	mov	ax,INT_BASE
-	out	IO_INT_BASE,al
-
-	mov	di,INTVEC_VBLANK_START
-	add	di,ax
-	shl	di,2			; *4
-	mov	word [es:di],VBlank
-	mov	word [es:di+0x2],MYSEGMENT
-
-	xor	ax,ax			; Clear HBL & Timer
-	out	IOw_HBLANK_FREQ,ax
-	out	IO_TIMER_CTRL,al
-
-	dec	al			; Ack all Int
-	out	IO_INT_ACK,al
-
-	mov	al,INT_VBLANK_START	; Enable VBL Int
-	out	IO_INT_ENABLE,al
-
-	sti				; Enable Interrupts !
-
-;--------------------------------
-
-	; Set Segments for Copy
-	mov	ax,0x2000 ; ! note, try	0x2000, 0x4000, etc..
-	mov	ds,ax
-	xor	ax,ax
-	mov	es,ax
-
-	mov	si, __seg1DL
-	mov	di, USER_RAM
-	mov	ax, __seg1DH
-	mov	bx, __seg1DL
-	sub	bx, ax
-	mov	cx, ax
-	rep	movsb
-	; Make BG
-
-	mov	si,TileGfx
-	mov	di,WSC_TILE_BANK1
-	mov	cx,(TileGfxE-TileGfx)/2
-	rep	movsw
-
-	;mov	si,TilePal
-	;mov	di,WSC_PALETTES
-	;mov	cx,32
-	;rep	movsb
-;back:
-	call	_main
-	;call	_main
-	;call	_test_copy
-	;call	_test_copy
-	;jmp	back
-
-	mov	ax,BG_CHR(0,0,0,0,0)	; Initial Tile, Pal 0, Bank 0
-	mov	di,bgmap
-	mov	cx,MAP_TWIDTH*MAP_THEIGHT
-	rep	stosw
-
-	; Display !
-	mov	al,BG_ON | FG_ON
-	out	IO_DISPLAY_CTRL,al
-
-blaat:
-	jmp	blaat
-
-	; Loop Read Buttons
-loop:
-	mov	al,KEYPAD_READ_BUTTONS
-	out	IO_KEYPAD,al
-	nop
-	nop
-	nop
-	nop
-	in	al,IO_KEYPAD
-
-	test	al,PAD_A	; Press A for Audio
-	jz	loop
-
-	call	_main
-	jmp	loop
-
-;******************************************
-
-VBlank:
-	push	ax
-
-	mov	al,[es:VBLcnt]
-	inc	al
-	mov	[es:VBLcnt],al
-	and	al,3
-	jnz	.noscroll
-
-	in	al,IO_BG_X	; Infinite Scroll
-	inc	al
-	out	IO_BG_X,al
-
-	in	al,IO_BG_Y
-	inc	al
-	out	IO_BG_Y,al
-
-.noscroll:
-	in	al,IO_INT_ACK
-	or	al,INT_VBLANK_START
-	out	IO_INT_ACK,al
-
-	pop	ax
-	iret
-
-;******************************************
-
-	align	2
-
-TilePal:	incbin	"gfx/bgtile.pal"
-TileGfx:	incbin	"gfx/bgtile.gfx"
-TileGfxE:
-
-;******************************************
-
-	;ROM_HEADER	__end, MYSEGMENT, 0x42, RH_WS_COLOR, RH_ROM_8MBITS, RH_NO_SRAM, RH_HORIZONTAL
-
-;******************************************
-
-	;section .bss	
-
-	;start=0x0100	; Keep space for Int Vectors
-
-VBLcnt:		resb	0	; Our datas in RAM
-
diff --git a/src/main.c b/src/main.c
index 3763f3c..502d63c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,101 +1,51 @@
-/* #include <code16bit.h> */
-#include <memory.h>
 
-void outport(c)
-	unsigned c;
-{
-#asm
-	xor dx, dx
-	mov dx, ax
-	shr dx, 8
-	out dx, al
-	;out 0x15, al
-#endasm
-}
-
-static unsigned char data[] = {
-0x65, 0x06, 0x67, 0x06, 0x79, 0x07, 0x8c, 0x08, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f,
-0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f
+/* sprite data */
+unsigned char bgtile_gfx[] = {
+  0x31, 0x22, 0x31, 0x32, 0x22, 0x31, 0x23, 0x21, 0x13, 0x13, 0x31, 0x32,
+  0x32, 0x31, 0x23, 0x12, 0x21, 0x32, 0x13, 0x23, 0x23, 0x13, 0x31, 0x31,
+  0x12, 0x32, 0x13, 0x22, 0x23, 0x13, 0x22, 0x13
 };
 
-static unsigned char data2[] = {
-0x65, 0x06, 0x67, 0x06, 0x79, 0x07, 0x8c, 0x08, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f,
-0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f
+/* palette data */
+unsigned char bgtile_pal[] = {
+  0x65, 0x06, 0x67, 0x06, 0x79, 0x07, 0x8c, 0x08, 0xff, 0x0f, 0xff, 0x0f,
+  0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f,
+  0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f
 };
 
-static unsigned char data3[] = {
-0x65, 0x06, 0x67, 0x06, 0x79, 0x07, 0x8c, 0x08, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f,
-0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f, 0xff, 0x0f
-};
-	
 
+/* data */
+unsigned char lol[5] = { 0xAA, 0x2, 0x3, 0x4, 0x5};
+unsigned char lol2[5] = { 0x1, 0x2, 0x3, 0x4, 0x5};
+unsigned char lol3[5] = { 0x1, 0x2, 0x3, 0x4, 0x5};
+#define PALETTE (*(volatile unsigned *)0xFE00)
+#define PALETTE_T (volatile unsigned *)0xFE00
+#define SPRITE_T (volatile unsigned *)0x4000
 
-unsigned short *memcpy(dest, src, cnt)
-	unsigned short *dest;
-	unsigned short *src;
-	int cnt;
-{
-
-	int i;
-#asm
-	;push ds
-	;push es
-	mov ax, 0x0
-	mov ds, ax
-	xor ax, ax
-	mov es, ax
-#endasm
-	for (i = 0; i < cnt; ++i) {
-		*dest++ = *src++;
-		//*dest++ = 0x66;
-	}
-#asm	
-	;pop es
-	;pop ds
-	mov ds, 0xF000
-#endasm
-	return dest;
-}
-
-void test_copy()
-{
-#asm 
-	;mov ds, 0
-#endasm
-      
-//	unsigned short dest = 0xFE00;
-//	unsigned * ptr = dest;
-//	*ptr++ = 0xDEAD;
-//	*ptr++ = 0xAAAA;
-//	*ptr++ = 0xDEAD;
-    	memcpy(0xFE00, 0x1000, 16);
-#asm 
-	;mov ds, 0xF000
-#endasm
-	//wmemcpy(WSC_PALETTES, 0x2F000, 32);
-	return;
-}
+/* bss */
+static unsigned char blaat[100];
 
-int main()
+int main(void)
 {
-	unsigned short data_seg = 0xF000;
-	unsigned short data_ram = 0x1000;
-	unsigned short rel_ram = data_seg - data_ram;
+	lol[0] = 0xDD;
+	lol[1] = 0xDD;
 
-	/* dummy */
-    	memcpy(0x0, 0x0, 0);
-
-	memcpy(0xFE00, data - rel_ram, 16);
-	//memcpy(0xFE00, data_seg + data, 16);
+	blaat[0] = 0xEE;
+	blaat[1] = 0xEE;
+	blaat[32] = 0xEE;
 	
-	//while(1) {
-	//	/* outport(0x15EE); */
-	//	unsigned reg = 0x15;
-	//	unsigned val = 0xEE;
-	//	outport((reg << 8) | val);
-
-	//}
+	unsigned char * ptr = PALETTE_T;
+	for (int i = 0; i < sizeof(bgtile_pal); ++i) {
+		*ptr++ = bgtile_pal[i];
+	}
+	
+	ptr = SPRITE_T;
+	for (int i = 0; i < sizeof(bgtile_gfx); ++i) {
+		*ptr++ = bgtile_gfx[i];
+	}
 
+	while(1) {
+	}
 
 	return 0;
 }
diff --git a/swan.ld b/swan.ld
new file mode 100644
index 0000000..e3c7449
--- /dev/null
+++ b/swan.ld
@@ -0,0 +1,26 @@
+OUTPUT_FORMAT(binary)
+ENTRY(_start)
+SECTIONS
+{
+    . = 0x0;
+    .text :
+    {
+	_stext = .;
+        *(.text);
+	_etext = .;
+    }
+    . = 0x1000;
+    .data : AT(_etext)
+    {
+	_sdata = .;
+        *(.data);
+	_edata = .;
+        *(.bss);
+        *(.rodata);
+    }
+    _heap = ALIGN(4);
+    /DISCARD/ : 
+    {
+         *(.eh_frame)
+    }
+}
-- 
2.7.4