initial cd image build system

.gitignore

@@ -1,3 +1,12 @@
 *.pyc
 __pycache__
 .~*
+*.BIN
+*.bin
+*.elf
+*.d
+*.iso
+*.cdi
+*.o
+scramble
+cdi4dc

ABSTRACT.TXT

@@ -0,0 +1 @@
+abstract

BIBLIOGR.TXT

@@ -0,0 +1 @@
+bibliography

COPYRIGH.TXT

@@ -0,0 +1 @@
+Copyright(c) SEGA ENTERPRISES, LTD. 1998

Makefile

@@ -0,0 +1 @@
+include common.mk

common.mk

@@ -0,0 +1,112 @@
+LIB ?= .
+OPT ?= -Og
+DEBUG ?= -g -gdwarf-4
+GENERATED ?=
+
+AARCH = --isa=sh4 --little
+AFLAGS = --fatal-warnings
+
+CARCH = -m4-single-only -ml
+CFLAGS += -falign-functions=4 -ffunction-sections -fdata-sections -fshort-enums -ffreestanding -nostdlib
+CFLAGS += -Wall -Werror -Wfatal-errors -Wno-error=unused-variable
+DEPFLAGS = -MMD -E
+# --print-gc-sections
+LDFLAGS = --gc-sections --no-warn-rwx-segment --print-memory-usage --entry=_start --orphan-handling=error
+CXXFLAGS = -std=c++20 -fno-exceptions -fno-non-call-exceptions -fno-rtti -fno-threadsafe-statics
+
+TARGET = sh4-none-elf-
+CC = $(TARGET)gcc
+CXX = $(TARGET)g++
+AS = $(TARGET)as
+LD = $(TARGET)ld
+OBJCOPY = $(TARGET)objcopy
+OBJDUMP = $(TARGET)objdump
+
+IP_OBJ = \
+	systemid.o \
+	toc.o \
+	sg/sg_sec.o \
+	sg/sg_arejp.o \
+	sg/sg_areus.o \
+	sg/sg_areec.o \
+	sg/sg_are00.o \
+	sg/sg_are01.o \
+	sg/sg_are02.o \
+	sg/sg_are03.o \
+	sg/sg_are04.o \
+	sg/sg_ini.o \
+	sg/aip.o
+
+all: main.elf
+
+%.o: %.obj
+	$(OBJCOPY) -g \
+		--rename-section IP=.text.$* \
+		$< $@
+
+%.o: %.s
+	$(AS) $(AARCH) $(AFLAGS) $(DEBUG) $< -o $@
+
+%.c.d: | $(GENERATED)
+	$(CC) $(CARCH) $(CFLAGS) $(OPT) $(DEBUG) $(DEPFLAGS) -c $(basename $@) -MF $@ -o /dev/null
+
+%.o: %.c %.c.d
+	$(CC) $(CARCH) $(CFLAGS) $(OPT) $(DEBUG) -c $< -o $@
+
+main.elf: main.o
+	$(LD) $(LDFLAGS) -T $(LIB)/main.lds $^ -o $@
+
+%.bin: %.elf
+	$(OBJCOPY) -O binary $< $@
+
+ip.elf: $(IP_OBJ)
+	$(LD) --print-memory-usage -T $(LIB)/ip.lds $^ -o $@
+
+audio.pcm:
+	sox \
+		--rate 44100 \
+		--encoding signed-integer \
+		--bits 16 \
+		--channels 2 \
+		--endian little \
+		--null \
+		$@.raw \
+		synth 1 sin 440 vol -10dB
+	mv $@.raw $@
+
+1ST_READ.BIN: main.bin
+	./scramble main.bin 1ST_READ.BIN
+
+%.iso: 1ST_READ.BIN ip.bin
+	mkisofs \
+		-C 0,11702 \
+		-sysid     "SEGA SEGAKATANA" \
+		-volid     "SAMPLE_GAME_TITLE" \
+		-volset    "SAMPLE_GAME_TITLE" \
+		-publisher "SEGA ENTERPRISES, LTD." \
+		-preparer  "CRI CD CRAFT VER.2.27" \
+		-copyright "COPYRIGH.TXT" \
+		-abstract  "ABSTRACT.TXT" \
+		-biblio    "BIBLIOGR.TXT" \
+		-sectype data \
+		-G ip.bin \
+		-o $@ \
+		-graft-points \
+		/=./1ST_READ.BIN \
+		/=./COPYRIGH.TXT \
+		/=./ABSTRACT.TXT \
+		/=./BIBLIOGR.TXT
+
+%.cdi: %.iso
+	./cdi4dc $< $@ >/dev/null
+
+.SUFFIXES:
+.INTERMEDIATE:
+.SECONDARY:
+.PHONY: all clean
+
+%: RCS/%,v
+%: RCS/%
+%: %,v
+%: s.%
+%: SCCS/s.%

ip.lds

@@ -0,0 +1,56 @@
+OUTPUT_FORMAT("elf32-shl", "elf32-shl", "elf32-shl")
+
+MEMORY
+{
+  systemid (arx) : ORIGIN = 0x8c008000, LENGTH = 0x100
+  toc      (arx) : ORIGIN = 0x8c008100, LENGTH = 0x200
+  sg_sec   (arx) : ORIGIN = 0x8c008300, LENGTH = 0x3400
+  sg_are   (arx) : ORIGIN = 0x8c00b700, LENGTH = 0x100
+  sg_ini   (arx) : ORIGIN = 0x8c00b800, LENGTH = 0x2800
+  aip      (arx) : ORIGIN = 0x8c00e000, LENGTH = 0x2000
+}
+
+SECTIONS
+{
+  .text.systemid :
+  {
+    KEEP(*(.text.systemid))
+  } > systemid
+
+  .text.toc :
+  {
+    KEEP(*(.text.toc))
+  } > toc
+
+  .text.sg_sec :
+  {
+    KEEP(*(.text.sg_sec))
+  } > sg_sec
+
+  .text.sg_are :
+  {
+    KEEP(*(.text.sg_arejp))
+    KEEP(*(.text.sg_areus))
+    KEEP(*(.text.sg_areec))
+    KEEP(*(.text.sg_are00))
+    KEEP(*(.text.sg_are01))
+    KEEP(*(.text.sg_are02))
+    KEEP(*(.text.sg_are03))
+    KEEP(*(.text.sg_are04))
+  } > sg_are
+
+  .text.sg_ini :
+  {
+    KEEP(*(.text.sg_ini))
+  } > sg_ini
+
+  .text.aip :
+  {
+    KEEP(*(.text.aip))
+  } > aip
+
+  /DISCARD/ :
+  {
+    *(*)
+  }
+}

main.c

@@ -0,0 +1,53 @@
+#include <stdint.h>
+
+volatile uint8_t * SCFTDR2 = (volatile uint8_t *)0xFFE8000C;
+
+volatile uint32_t * SOFT_RESET  = (volatile uint32_t *)0xa05f8008;
+volatile uint32_t * STARTRENDER = (volatile uint32_t *)0xa05f8014;
+volatile uint32_t * VO_CONTROL = (volatile uint32_t *)0xa05f80e8;
+volatile uint32_t * VO_BORDER_COL = (volatile uint32_t *)0xa05f8040;
+
+volatile uint32_t * FB_R_SOF1 = (volatile uint32_t *)0xa05f8050;
+
+volatile uint32_t * RAM = (volatile uint32_t *)0xa5000000;
+
+volatile uint32_t * SPG_STATUS = (volatile uint32_t *)0xa05f810;
+
+void start()
+{
+  *SCFTDR2 = 'H';
+  *SCFTDR2 = 'e';
+  *SCFTDR2 = 'l';
+  *SCFTDR2 = 'l';
+  *SCFTDR2 = '3';
+
+  *SOFT_RESET = 0b111;
+  *SOFT_RESET = 0b000;
+
+  *VO_CONTROL |= 1 << 3;
+  *VO_BORDER_COL = 31;
+
+  for (int i = 0; i < (2*1024*1024 + 1024 * 2 + 512 + 4) / 4; i++) {
+    RAM[i] = 0x1;
+  }
+
+  while (1) {
+  }
+}
+
+/*
+    {
+        DM_640x480,
+        640, 480,
+	VID_INTERLACE, // flags
+        CT_VGA, // cable type
+        0, // pixel mode
+        0x20C, 0x359, // scanlines, clocks per scanline
+        0xAC, 0x28,   // bitmap x, bitmap y
+        0x15, 0x104,  // first scanline interrupt, second scanline interrupt
+        0x7E, 0x345,  // border x start, border x stop
+        0x24, 0x204,  // border y start, border y stop
+        0, 1,         // current framebuffer, number of framebuffers
+        { 0, 0, 0, 0 } // offset to framebuffers
+    },
+*/

main.lds

@@ -0,0 +1,53 @@
+OUTPUT_FORMAT("elf32-shl", "elf32-shl", "elf32-shl")
+MEMORY
+{
+  ram : ORIGIN = 0x8c010000, LENGTH = 1M
+}
+SECTIONS
+{
+  . = 0x8c010000;
+
+  .text ALIGN(4) : SUBALIGN(4)
+  {
+    KEEP(*(.text.start))
+    *(.text)
+    *(.text.*)
+  } > ram
+
+  .data ALIGN(4) : SUBALIGN(4)
+  {
+    *(.data)
+    *(.data.*)
+  } > ram
+
+  .rodata ALIGN(4) : SUBALIGN(4)
+  {
+    *(.rodata)
+    *(.rodata.*)
+  } > ram
+
+  .ctors ALIGN(4) : SUBALIGN(4)
+  {
+    KEEP(*(.ctors))
+    KEEP(*(.ctors.*))
+  } > ram
+
+  .bss ALIGN(4) (NOLOAD) : SUBALIGN(4)
+  {
+    *(.bss)
+    *(.bss.*)
+  } > ram
+
+  /DISCARD/ :
+  {
+    *(.debug*)
+    *(.comment*)
+    *(.rela*)
+  }
+
+  __bss_link_start = ADDR(.bss);
+  __bss_link_end = ADDR(.bss) + SIZEOF(.bss);
+
+  __ctors_link_start = ADDR(.ctors);
+  __ctors_link_end = ADDR(.ctors) + SIZEOF(.ctors);
+}

scramble.c

@@ -0,0 +1,259 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define MAXCHUNK (2048*1024)
+
+static unsigned int seed;
+
+void my_srand(unsigned int n)
+{
+  seed = n & 0xffff;
+}
+
+unsigned int my_rand()
+{
+  seed = (seed * 2109 + 9273) & 0x7fff;
+  return (seed + 0xc000) & 0xffff;
+}
+
+void load(FILE *fh, unsigned char *ptr, unsigned long sz)
+{
+  if(fread(ptr, 1, sz, fh) != sz)
+    {
+      fprintf(stderr, "Read error!\n");
+      exit(1);
+    }
+}
+
+void load_chunk(FILE *fh, unsigned char *ptr, unsigned long sz)
+{
+  static int idx[MAXCHUNK/32];
+  int i;
+
+  /* Convert chunk size to number of slices */
+  sz /= 32;
+
+  /* Initialize index table with unity,
+     so that each slice gets loaded exactly once */
+  for(i = 0; i < sz; i++)
+    idx[i] = i;
+
+  for(i = sz-1; i >= 0; --i)
+    {
+      /* Select a replacement index */
+      int x = (my_rand() * i) >> 16;
+
+      /* Swap */
+      int tmp = idx[i];
+      idx[i] = idx[x];
+      idx[x] = tmp;
+
+      /* Load resulting slice */
+      load(fh, ptr+32*idx[i], 32);
+    }
+}
+
+void load_file(FILE *fh, unsigned char *ptr, unsigned long filesz)
+{
+  unsigned long chunksz;
+
+  my_srand(filesz);
+
+  /* Descramble 2 meg blocks for as long as possible, then
+     gradually reduce the window down to 32 bytes (1 slice) */
+  for(chunksz = MAXCHUNK; chunksz >= 32; chunksz >>= 1)
+    while(filesz >= chunksz)
+      {
+	load_chunk(fh, ptr, chunksz);
+	filesz -= chunksz;
+	ptr += chunksz;
+      }
+
+  /* Load final incomplete slice */
+  if(filesz)
+    load(fh, ptr, filesz);
+}
+
+void read_file(char *filename, unsigned char **ptr, unsigned long *sz)
+{
+  FILE *fh = fopen(filename, "rb");
+  if(fh == NULL)
+    {
+      fprintf(stderr, "Can't open \"%s\".\n", filename);
+      exit(1);
+    }
+  if(fseek(fh, 0, SEEK_END)<0)
+    {
+      fprintf(stderr, "Seek error.\n");
+      exit(1);
+    }
+  *sz = ftell(fh);
+  *ptr = malloc(*sz);
+  if( *ptr == NULL )
+    {
+      fprintf(stderr, "Out of memory.\n");
+      exit(1);
+    }
+  if(fseek(fh, 0, SEEK_SET)<0)
+    {
+      fprintf(stderr, "Seek error.\n");
+      exit(1);
+    }
+  load_file(fh, *ptr, *sz);
+  fclose(fh);
+}
+
+void save(FILE *fh, unsigned char *ptr, unsigned long sz)
+{
+  if(fwrite(ptr, 1, sz, fh) != sz)
+    {
+      fprintf(stderr, "Write error!\n");
+      exit(1);
+    }
+}
+
+void save_chunk(FILE *fh, unsigned char *ptr, unsigned long sz)
+{
+  static int idx[MAXCHUNK/32];
+  int i;
+
+  /* Convert chunk size to number of slices */
+  sz /= 32;
+
+  /* Initialize index table with unity,
+     so that each slice gets saved exactly once */
+  for(i = 0; i < sz; i++)
+    idx[i] = i;
+
+  for(i = sz-1; i >= 0; --i)
+    {
+      /* Select a replacement index */
+      int x = (my_rand() * i) >> 16;
+
+      /* Swap */
+      int tmp = idx[i];
+      idx[i] = idx[x];
+      idx[x] = tmp;
+
+      /* Save resulting slice */
+      save(fh, ptr+32*idx[i], 32);
+    }
+}
+
+void save_file(FILE *fh, unsigned char *ptr, unsigned long filesz)
+{
+  unsigned long chunksz;
+
+  my_srand(filesz);
+
+  /* Descramble 2 meg blocks for as long as possible, then
+     gradually reduce the window down to 32 bytes (1 slice) */
+  for(chunksz = MAXCHUNK; chunksz >= 32; chunksz >>= 1)
+    while(filesz >= chunksz)
+      {
+	save_chunk(fh, ptr, chunksz);
+	filesz -= chunksz;
+	ptr += chunksz;
+      }
+
+  /* Save final incomplete slice */
+  if(filesz)
+    save(fh, ptr, filesz);
+}
+
+void write_file(char *filename, unsigned char *ptr, unsigned long sz)
+{
+  FILE *fh = fopen(filename, "wb");
+  if(fh == NULL)
+    {
+      fprintf(stderr, "Can't open \"%s\".\n", filename);
+      exit(1);
+    }
+  save_file(fh, ptr, sz);
+  fclose(fh);
+}
+
+void descramble(char *src, char *dst)
+{
+  unsigned char *ptr = NULL;
+  unsigned long sz = 0;
+  FILE *fh;
+
+  read_file(src, &ptr, &sz);
+
+  fh = fopen(dst, "wb");
+  if(fh == NULL)
+    {
+      fprintf(stderr, "Can't open \"%s\".\n", dst);
+      exit(1);
+    }
+  if( fwrite(ptr, 1, sz, fh) != sz )
+    {
+      fprintf(stderr, "Write error.\n");
+      exit(1);
+    }
+  fclose(fh);
+  free(ptr);
+}
+
+void scramble(char *src, char *dst)
+{
+  unsigned char *ptr = NULL;
+  unsigned long sz = 0;
+  FILE *fh;
+
+  fh = fopen(src, "rb");
+  if(fh == NULL)
+    {
+      fprintf(stderr, "Can't open \"%s\".\n", src);
+      exit(1);
+    }
+  if(fseek(fh, 0, SEEK_END)<0)
+    {
+      fprintf(stderr, "Seek error.\n");
+      exit(1);
+    }
+  sz = ftell(fh);
+  ptr = malloc(sz);
+  if( ptr == NULL )
+    {
+      fprintf(stderr, "Out of memory.\n");
+      exit(1);
+    }
+  if(fseek(fh, 0, SEEK_SET)<0)
+    {
+      fprintf(stderr, "Seek error.\n");
+      exit(1);
+    }
+  if( fread(ptr, 1, sz, fh) != sz )
+    {
+      fprintf(stderr, "Read error.\n");
+      exit(1);
+    }
+  fclose(fh);
+
+  write_file(dst, ptr, sz);
+
+  free(ptr);
+}
+
+int main(int argc, char *argv[])
+{
+  int opt = 0;
+
+  if(argc > 1 && !strcmp(argv[1], "-d"))
+    opt ++;
+
+  if(argc != 3+opt)
+    {
+      fprintf(stderr, "Usage: %s [-d] from to\n", argv[0]);
+      exit(1);
+    }
+  
+  if(opt)
+    descramble(argv[2], argv[3]);
+  else
+    scramble(argv[1], argv[2]);
+
+  return 0;
+}

systemid.s

@@ -0,0 +1,52 @@
+	/*
+<A><-------B------> <C->
+
+1100 0000 0000 0000 1000 0001 0000
+
+0000 0000 0000 0000 0000 0000 0000
+^^^^ ^^^^ ^^^^ ^^^^ ^^^^    ^    ^
+|||| |||| |||| |||| ||||    |    |
+|||| |||| |||| |||| ||||    |    +----- Uses Windows CE
+|||| |||| |||| |||| ||||    |
+|||| |||| |||| |||| ||||    +-----  VGA box support
+|||| |||| |||| |||| ||||
+|||| |||| |||| |||| |||+----- Other expansions
+|||| |||| |||| |||| ||+----- Puru Puru pack
+|||| |||| |||| |||| |+----- Mike device
+|||| |||| |||| |||| +----- Memory card
+|||| |||| |||| |||+------ Start + A + B + Directions
+|||| |||| |||| ||+------ C button
+|||| |||| |||| |+------ D button
+|||| |||| |||| +------ X button
+|||| |||| |||+------- Y button
+|||| |||| ||+------- Z button
+|||| |||| |+------- Expanded direction buttons
+|||| |||| +------- Analog R trigger
+|||| |||+-------- Analog L trigger
+|||| ||+-------- Analog horizontal controller
+|||| |+-------- Analog vertical controller
+|||| +-------- Expanded analog horizontal
+|||+--------- Expanded analog vertical
+||+--------- Gun
+|+--------- Keyboard
++--------- Mouse
+	*/
+
+	.section .text.systemid
+
+	.ascii "SEGA SEGAKATANA " /* H/W identifier */
+	.ascii "SEGA ENTERPRISES" /* H/W Vendor ID */
+	.ascii "39F1 "            /* Media ID */
+	.ascii      "GD-ROM1/1  " /* Media information */
+	.ascii "JUE     "         /* Compatible Area Symbol */
+	.ascii         "C000810	" /* Compatible peripherals */
+	.ascii "HDR-0900  "       /* Product number */
+	.ascii           "V0.000" /* Version number */
+	.ascii "19980901"         /* Release date */
+	.ascii         "        " /* Reserved */
+	.ascii "1ST_READ.BIN"
+	.ascii             "    " /* Reserved */
+	.ascii "SEGA LC-KAISYAID" /* Maker identifier */
+	.ascii "SAMPLE GAME     " /* Game title */
+	.fill  (96-16),1,0x20     /* Game title */
+	.fill  32,1,0x20          /* Reserved */

toc.s

@@ -0,0 +1,4 @@
+	.section .text.toc
+
+	.fill (101*4),1,0xff
+	.fill (27 *4),1,0x00