native_java_io_printstream_write

.gitignore

@@ -5,6 +5,7 @@
 *.csv
 *.class
 *.out
+*.elf
 main
 print_class
 __pycache__

Makefile

@@ -1,48 +1,23 @@
 %.csv: %.ods
 	libreoffice --headless --convert-to csv:"Text - txt - csv (StarCalc)":44,34,76,,,,true --outdir $(dir $@) $<
 
-%.class: %.java
-	javac $<
-
-java/lang/%.class: java/lang/%.java
-	javac --source 8 --target 8 --boot-class-path . $<
-
-OBJ = \
-	c/decode.o \
-	c/class_file.o \
-	c/debug_class_file.o \
-	c/malloc.o \
-	c/file.o \
-	c/execute.o \
-	c/memory_allocator.o \
-	c/class_resolver.o \
-	c/hash_table.o \
-	c/frame.o \
-	c/printf.o \
-	c/parse.o \
-	c/unparse.o
-
-MAIN_OBJ = \
-	$(OBJ) \
-	c/main.o
-
-PRINT_CLASS_OBJ = \
-	$(OBJ) \
-	c/print_class.o \
+include java.mk
 
 CC ?= gcc
 ARCH = -m32
-CFLAGS ?= -Wall -Werror -Wfatal-errors -Wno-error=unused-variable -fstack-protector -std=c2x -DDEBUG -g
+CFLAGS += -Wall -Werror -Wfatal-errors -Wno-error=unused-variable -fstack-protector -std=c2x -g
+CFLAGS += -DDEBUG
+#CFLAGS += -DDEBUG_PRINT
 OPT ?= -O0
 DEPFLAGS = -MMD -MP
 
 %.o: %.c
 	$(CC) $(ARCH) $(CFLAGS) $(OPT) $(DEPFLAGS) -MF ${<}.d -c $< -o $@
 
-print_class: $(PRINT_CLASS_OBJ)
+print_class: $(OBJ) $(PRINT_CLASS_OBJ)
 	$(CC) $(ARCH) $^ -o $@
 
-main: $(MAIN_OBJ)
+main: $(OBJ) $(MAIN_HOSTED_OBJ)
 	$(CC) $(ARCH) $^ -o $@
 
 clean:

Makefile.dreamcast.mk

@@ -0,0 +1,57 @@
+all: $(patsubst %.cpp,%.elf,$(wildcard example/*.cpp))
+
+OPT = -O0
+
+MAKEFILE_PATH := $(patsubst %/,%,$(dir $(abspath $(firstword $(MAKEFILE_LIST)))))
+LIB ?= $(MAKEFILE_PATH)/dreamcast
+CFLAGS += -D__dreamcast__
+CFLAGS += -DDEBUG
+#CFLAGS += -DDEBUG_PRINT
+CFLAGS += -I$(MAKEFILE_PATH)
+CFLAGS += -I$(MAKEFILE_PATH)/dreamcast/
+CARCH = -m4-single -ml
+
+include dreamcast/base.mk
+include dreamcast/common.mk
+include dreamcast/headers.mk
+
+include java.mk
+
+%.class.o: %.class
+	$(BUILD_BINARY_O)
+
+%.class.h: %.class
+	$(BUILD_BINARY_H)
+
+libgcc/%.o: $(LIBGCC)
+	@mkdir -p $(dir $@)
+	ar x --output $(dir $@) $(LIBGCC) $(notdir $@)
+	sh4-none-elf-objdump -t $@ \
+		| grep -E '[.]hidden' \
+		| grep -vE 'UND' \
+		| cut -d' ' -f10 \
+		| xargs rebind --visibility=default $@
+
+LIBGCC_OBJ = \
+	libgcc/_divdi3.o \
+	libgcc/_udiv_qrnnd_16.o \
+	libgcc/_clz.o \
+	libgcc/_moddi3.o \
+	libgcc/_fixdfdi.o \
+	libgcc/_fixunsdfdi.o \
+	libgcc/_fixunssfdi.o \
+	libgcc/_floatdisf.o \
+	libgcc/_floatdidf.o \
+	libgcc/_sdivsi3.o \
+	libgcc/_fixsfdi.o \
+	libgcc/_div_table.o
+
+CLASS_FILES = \
+	p/Native.class.o \
+	java/lang/String.class.o \
+	java/lang/System.class.o \
+	java/io/PrintStream.class.o \
+	java/lang/Object.class.o
+
+main.elf: LDSCRIPT = $(LIB)/main.lds
+main.elf: $(START_OBJ) $(OBJ) $(MAIN_OBJ) $(MAIN_DREAMCAST_OBJ) $(LIBGCC_OBJ) $(CLASS_FILES)

c/assert.h

@@ -1,11 +1,7 @@
 #pragma once
 
-#if defined(__linux__)
-#include "assert_hosted.h"
-#elif defined(_WIN32)
-#include "assert_hosted.h"
-#elif defined(__APPLE__)
-#include "assert_hosted.h"
-#else
+#if defined(__dreamcast__)
 #include "assert_dreamcast.h"
+#else
+#include "assert_hosted.h"
 #endif

c/assert_dreamcast.h

@@ -1,3 +1,11 @@
 #pragma once
 
-#define assert(b)
+#include "printf.h"
+
+#define assert(b)                                                       \
+  do {                                                                  \
+    if (!(b)) {                                                         \
+      printf("%s:%d %s: assertion `%s` failed\n", __FILE__, __LINE__, __func__, #b); \
+      while (1);                                                        \
+    }                                                                   \
+  } while (0);

c/class_resolver.c

@@ -147,9 +147,7 @@ static void class_resolver_allocate_attribute_entry(struct class_entry * class_e
   class_entry->attribute_entry = attribute_entry;
 }
 
-struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t * class_names[],
-                                                           const int class_names_length[],
-                                                           uint8_t * buffers[],
+struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t ** buffers,
                                                            int length,
                                                            int * hash_table_length)
 {
@@ -167,10 +165,15 @@ struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t * class
     class_entry[i].class_file = class_file;
     class_entry[i].initialization_state = CLASS_UNINITIALIZED;
 
+    struct constant * class_constant = &class_file->constant_pool[class_file->this_class - 1];
+    assert(class_constant->tag == CONSTANT_Class);
+    struct constant * class_name_constant = &class_file->constant_pool[class_constant->class.name_index - 1];
+    assert(class_name_constant->tag == CONSTANT_Utf8);
+
     hash_table_add(class_hash_table_length,
                    class_hash_table,
-                   class_names[i],
-                   class_names_length[i],
+                   class_name_constant->utf8.bytes,
+                   class_name_constant->utf8.length,
                    &class_entry[i]);
 
     // make hash table for interfaces

c/class_resolver.h

@@ -48,9 +48,7 @@ struct class_entry {
   } methods;
 };
 
-struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t * class_names[],
-                                                           const int class_names_length[],
-                                                           uint8_t * buffers[],
+struct hash_table_entry * class_resolver_load_from_buffers(const uint8_t ** buffers,
                                                            int length,
                                                            int * hash_table_length);
 struct class_entry * class_resolver_lookup_class(int class_hash_table_length,

c/debug_class_file.c

@@ -1,5 +1,4 @@
 #include <stdint.h>
-#include <inttypes.h>
 
 #include "assert.h"
 #include "class_file.h"
@@ -51,7 +50,7 @@ void print_constant(struct constant * constant)
            *(float *)(&constant->_float.bytes));
     break;
   case CONSTANT_Long:
-    debugf("CONSTANT_Long bytes=%" PRId64 "\n",
+    debugf("CONSTANT_Long bytes=%l\n",
            constant->_long.bytes);
     break;
   case CONSTANT_Double:

c/decode.c

@@ -94,4 +94,7 @@ static inline int32_t aligned_s4(const void * buf)
 
 #define WIDE_NEXT_PC 0
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
 #include "decode.inc.c"
+#pragma GCC diagnostic pop

c/frame.c

@@ -2,7 +2,6 @@
 
 #include "assert.h"
 #include "class_file.h"
-#include "memory.h"
 #include "debug_class_file.h"
 #include "bytes.h"
 #include "decode.h"
@@ -10,6 +9,7 @@
 #include "class_resolver.h"
 #include "printf.h"
 #include "string.h"
+#include "native.h"
 
 struct Code_attribute * get_code_attribute(int code_name_index,
                                            int attributes_count,
@@ -75,9 +75,17 @@ static int descriptor_nargs(struct constant * descriptor_constant, uint8_t * ret
       nargs += 1;
       while (descriptor_constant->utf8.bytes[i] != ';') i += 1;
       break;
-    default:
+    case 'B': [[fallthrough]];
+    case 'C': [[fallthrough]];
+    case 'F': [[fallthrough]];
+    case 'I': [[fallthrough]];
+    case 'S': [[fallthrough]];
+    case 'Z':
       nargs += 1;
       break;
+    default:
+      assert(false);
+      break;
     }
     i += 1;
   }
@@ -187,18 +195,49 @@ bool vm_initialize_class(struct vm * vm, struct class_entry * class_entry)
   return true;
 }
 
-void vm_special_method_call(struct vm * vm, struct class_entry * class_entry, struct method_info * method_info)
+void vm_native_method_call(struct vm * vm, struct class_entry * class_entry, struct method_info * method_info, int nargs, uint8_t return_type)
 {
-  /* If the method is not native, the nargs argument values are popped from the
-     operand stack. A new frame is created on the Java Virtual Machine stack for
-     the method being invoked. The nargs argument values are consecutively made
-     the values of local variables of the new frame, with arg1 in local variable
-     0 (or, if arg1 is of type long or double, in local variables 0 and 1) and
-     so on. The new frame is then made current, and the Java Virtual Machine pc
-     is set to the opcode of the first instruction of the method to be
-     invoked. Execution continues with the first instruction of the method.
-  */
+  debugf("vm_static_native_method_call: nargs %d\n", nargs);
 
+  uint32_t args[nargs];
+  for (int i = 0; i < nargs; i++) {
+    uint32_t value = operand_stack_pop_u32(vm->current_frame);
+    debugf("args[%d] = %x\n", nargs - i - 1, value);
+    args[nargs - i - 1] = value;
+  }
+
+  debugf("native:\n  ");
+  struct constant * class_constant = &class_entry->class_file->constant_pool[class_entry->class_file->this_class - 1];
+  struct constant * class_name_constant = &class_entry->class_file->constant_pool[class_constant->class.name_index - 1];
+  print_constant(class_name_constant);
+  debugf("  ");
+  struct constant * method_name_constant = &class_entry->class_file->constant_pool[method_info->name_index - 1];
+  print_constant(method_name_constant);
+
+  int java_io_printstream_length = 19;
+  bool java_io_printstream =
+    class_name_constant->utf8.length == java_io_printstream_length &&
+    hash_table_key_equal(class_name_constant->utf8.bytes, (const uint8_t *)"java/io/PrintStream", class_name_constant->utf8.length);
+  if (java_io_printstream) {
+    int write_length = 5;
+    bool write =
+      method_name_constant->utf8.length == write_length &&
+      hash_table_key_equal(method_name_constant->utf8.bytes, (const uint8_t *)"write", method_name_constant->utf8.length);
+    if (write) {
+      if (nargs == 1) {
+        native_java_io_printstream_write_1(args);
+        return;
+      } else if (nargs == 2) {
+        native_java_io_printstream_write_2(args);
+        return;
+      }
+    }
+  }
+  assert(false);
+}
+
+void vm_method_call(struct vm * vm, struct class_entry * class_entry, struct method_info * method_info, int nargs, uint8_t return_type)
+{
   int code_name_index = find_code_name_index(class_entry->class_file);
   assert(code_name_index > 0);
 
@@ -215,11 +254,8 @@ void vm_special_method_call(struct vm * vm, struct class_entry * class_entry, st
   vm->current_frame->operand_stack = stack_push_data(&vm->data_stack, code->max_stack);
   vm->current_frame->operand_stack_ix = 0;
   vm->current_frame->initialization_frame = 0;
+  vm->current_frame->return_type = return_type;
 
-  struct constant * descriptor_constant = &class_entry->class_file->constant_pool[method_info->descriptor_index - 1];
-  int nargs = descriptor_nargs(descriptor_constant, &vm->current_frame->return_type);
-  nargs += 1;
-  debugf("nargs+1: %d\n", nargs);
   for (int i = 0; i < nargs; i++) {
     uint32_t value = operand_stack_pop_u32(old_frame);
     debugf("local[%d] = %x\n", nargs - i - 1, value);
@@ -233,6 +269,31 @@ void vm_special_method_call(struct vm * vm, struct class_entry * class_entry, st
   debugf("operand_stack_ix: %d\n", vm->current_frame->operand_stack_ix);
 }
 
+void vm_special_method_call(struct vm * vm, struct class_entry * class_entry, struct method_info * method_info)
+{
+  /* If the method is not native, the nargs argument values are popped from the
+     operand stack. A new frame is created on the Java Virtual Machine stack for
+     the method being invoked. The nargs argument values are consecutively made
+     the values of local variables of the new frame, with arg1 in local variable
+     0 (or, if arg1 is of type long or double, in local variables 0 and 1) and
+     so on. The new frame is then made current, and the Java Virtual Machine pc
+     is set to the opcode of the first instruction of the method to be
+     invoked. Execution continues with the first instruction of the method.
+  */
+
+  uint8_t return_type;
+  struct constant * descriptor_constant = &class_entry->class_file->constant_pool[method_info->descriptor_index - 1];
+  int nargs = descriptor_nargs(descriptor_constant, &return_type);
+  nargs += 1;
+  debugf("nargs+1: %d\n", nargs);
+
+  if (method_info->access_flags & METHOD_ACC_NATIVE) {
+    vm_native_method_call(vm, class_entry, method_info, nargs, return_type);
+  } else {
+    vm_method_call(vm, class_entry, method_info, nargs, return_type);
+  }
+}
+
 void vm_static_method_call(struct vm * vm, struct class_entry * class_entry, struct method_info * method_info)
 {
   /* If the method is not native, the nargs argument values are popped from the
@@ -245,38 +306,16 @@ void vm_static_method_call(struct vm * vm, struct class_entry * class_entry, str
      invoked. Execution continues with the first instruction of the method.
   */
 
-  int code_name_index = find_code_name_index(class_entry->class_file);
-  assert(code_name_index > 0);
-
-  struct Code_attribute * code = get_code_attribute(code_name_index,
-                                                    method_info->attributes_count,
-                                                    method_info->attributes);
-  assert(code != nullptr);
-
-  struct frame * old_frame = vm->current_frame;
-
-  vm->current_frame = stack_push_frame(&vm->frame_stack, 1);
-  vm->current_frame->code = code;
-  vm->current_frame->local_variable = stack_push_data(&vm->data_stack, code->max_locals);
-  vm->current_frame->operand_stack = stack_push_data(&vm->data_stack, code->max_stack);
-  vm->current_frame->operand_stack_ix = 0;
-  vm->current_frame->initialization_frame = 0;
-
+  uint8_t return_type;
   struct constant * descriptor_constant = &class_entry->class_file->constant_pool[method_info->descriptor_index - 1];
-  int nargs = descriptor_nargs(descriptor_constant, &vm->current_frame->return_type);
+  int nargs = descriptor_nargs(descriptor_constant, &return_type);
   debugf("nargs %d\n", nargs);
-  for (int i = 0; i < nargs; i++) {
-    uint32_t value = operand_stack_pop_u32(old_frame);
-    debugf("local[%d] = %x\n", nargs - i - 1, value);
-    vm->current_frame->local_variable[nargs - i - 1] = value;
+
+  if (method_info->access_flags & METHOD_ACC_NATIVE) {
+    vm_native_method_call(vm, class_entry, method_info, nargs, return_type);
+  } else {
+    vm_method_call(vm, class_entry, method_info, nargs, return_type);
   }
-  ;
-
-  vm->current_frame->pc = 0;
-  vm->current_frame->class_entry = class_entry;
-  vm->current_frame->method = method_info;
-
-  debugf("operand_stack_ix: %d\n", vm->current_frame->operand_stack_ix);
 }
 
 void vm_method_return(struct vm * vm)
@@ -399,6 +438,7 @@ void vm_start(int class_hash_table_length,
                                                                  class_hash_table,
                                                                  main_class,
                                                                  main_class_length);
+
   assert(class_entry != nullptr);
 
   const char * method_name = "main";

c/hash_table.c

@@ -77,15 +77,6 @@ void hash_table_add(int hash_table_length,
   e->value = value;
 }
 
-static inline bool key_equal(const uint8_t * a, const uint8_t * b, int length)
-{
-  for (int i = 0; i < length; i++) {
-    if (a[i] != b[i])
-      return false;
-  }
-  return true;
-}
-
 struct hash_table_entry * hash_table_find(int hash_table_length,
                                           struct hash_table_entry * entry,
                                           const uint8_t * key,
@@ -99,7 +90,7 @@ struct hash_table_entry * hash_table_find(int hash_table_length,
   while (e != nullptr && e->key != nullptr) {
     //debugf("key find: %p ", e->key);
     //print_key(e->key, e->key_length);
-    if (e->key_length == key_length && key_equal(key, e->key, e->key_length)) {
+    if (e->key_length == key_length && hash_table_key_equal(key, e->key, e->key_length)) {
       return e;
     }
     e = e->next;

c/hash_table.h

@@ -40,13 +40,11 @@ struct hash_table_entry * hash_table_find2(int hash_table_length,
                                            const uint8_t * key2,
                                            int key2_length);
 
-/*
-void hash_table_add_int(int hash_table_length,
-                        struct hash_table_entry * entry,
-                        int key,
-                        void * value);
-
-struct hash_table_entry * hash_table_find_int(int hash_table_length,
-                                              struct hash_table_entry * entry,
-                                              int key);
-*/
+static inline bool hash_table_key_equal(const uint8_t * a, const uint8_t * b, int length)
+{
+  for (int i = 0; i < length; i++) {
+    if (a[i] != b[i])
+      return false;
+  }
+  return true;
+}

c/main_dreamcast.c

@@ -0,0 +1,41 @@
+#include <stdint.h>
+
+#include "string.h"
+#include "class_resolver.h"
+#include "frame.h"
+#include "printf.h"
+
+#include "sh7091_scif.h"
+
+#include "p/Native.class.h"
+#include "java/lang/String.class.h"
+#include "java/lang/System.class.h"
+#include "java/io/PrintStream.class.h"
+#include "java/lang/Object.class.h"
+
+void main()
+{
+  scif_init(0);
+
+  const uint8_t * class_file_buffers[] = {
+    (const uint8_t *)&_binary_p_Native_class_start,
+    (const uint8_t *)&_binary_java_lang_String_class_start,
+    (const uint8_t *)&_binary_java_lang_System_class_start,
+    (const uint8_t *)&_binary_java_io_PrintStream_class_start,
+    (const uint8_t *)&_binary_java_lang_Object_class_start,
+  };
+  int class_file_buffers_length = (sizeof (class_file_buffers)) / (sizeof (class_file_buffers[0]));
+
+  const uint8_t * main_class = (const uint8_t *)"p/Native";
+  int main_class_length = string_length((const char *)main_class);
+
+  int class_hash_table_length;
+  struct hash_table_entry * class_hash_table = class_resolver_load_from_buffers(class_file_buffers,
+                                                                                class_file_buffers_length,
+                                                                                &class_hash_table_length);
+
+  vm_start(class_hash_table_length,
+           class_hash_table,
+           main_class,
+           main_class_length);
+}

c/main_hosted.c

@@ -9,29 +9,15 @@
 
 static struct hash_table_entry * load_from_filenames(const char * filenames[], int length, int * hash_table_length)
 {
-  const uint8_t ** class_names = (const uint8_t **)filenames;
-  int class_names_length[length];
   uint8_t * buffers[length];
   size_t file_size[length];
 
   for (int i = 0; i < length; i++) {
-    uint32_t filename_length = string_length(filenames[i]);
-    const char * suffix = ".class";
-    uint32_t suffix_length = string_length(suffix);
-    const char * filename_suffix = &filenames[i][filename_length - suffix_length];
-    if (filename_length <= suffix_length || !string_equal(suffix, filename_suffix)) {
-      printf("invalid class filename: %s\n", filenames[i]);
-      continue;
-    }
-    class_names_length[i] = filename_length - suffix_length;
     printf("load class: %s\n", filenames[i]);
-
     buffers[i] = file_read(filenames[i], &file_size[i]);
   }
 
-  struct hash_table_entry * class_hash_table = class_resolver_load_from_buffers(class_names,
-                                                                                class_names_length,
-                                                                                buffers,
+  struct hash_table_entry * class_hash_table = class_resolver_load_from_buffers((const uint8_t **)buffers,
                                                                                 length,
                                                                                 hash_table_length);
 

c/native.c

@@ -0,0 +1,22 @@
+#include "native.h"
+#include "printf.h"
+
+void native_java_io_printstream_write(uint32_t * arrayref)
+{
+  uint32_t length = arrayref[0];
+  char * buf = (char *)&arrayref[1];
+  print_string(buf, length);
+}
+
+void native_java_io_printstream_write_1(uint32_t * args)
+{
+  uint32_t * arrayref = (uint32_t *)args[0];
+  native_java_io_printstream_write(arrayref);
+}
+
+void native_java_io_printstream_write_2(uint32_t * args)
+{
+  //uint32_t this = args[0];
+  uint32_t * arrayref = (uint32_t *)args[1];
+  native_java_io_printstream_write(arrayref);
+}

c/native.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <stdint.h>
+
+void native_java_io_printstream_write(uint32_t * arrayref);
+void native_java_io_printstream_write_1(uint32_t * args);
+void native_java_io_printstream_write_2(uint32_t * args);

c/printf.h

@@ -25,9 +25,16 @@ void print_cstring(const char * s);
 void _printf(const char * format, ...);
 
 #define printf(...) _printf(__VA_ARGS__)
+
+#if defined(DEBUG_PRINT)
 #define debugf(...) _printf(__VA_ARGS__)
 #define debugc(c) print_char(c)
 #define debugs(s) print_cstring(s)
+#else
+#define debugf(...)
+#define debugc(c)
+#define debugs(c)
+#endif
 
 #ifdef __cplusplus
 }

c/sh7091_scif.cpp

@@ -3,6 +3,62 @@
 
 #include "sh7091_scif.h"
 
+void scif_init_wait()
+{
+  sh7091.TMU.TSTR &= (~tmu::tstr::str1::counter_start) & 0xff; // stop TCNT1
+  sh7091.TMU.TOCR = tmu::tocr::tcoe::tclk_is_external_clock_or_input_capture;
+  sh7091.TMU.TCR1 = tmu::tcr1::tpsc::p_phi_1024; // 1024 / 50MHz = 20.48 μs
+  sh7091.TMU.TCOR1 = 0xffff'ffff;
+  sh7091.TMU.TCNT1 = 0xffff'ffff;
+  sh7091.TMU.TSTR |= tmu::tstr::str1::counter_start;
+
+  uint32_t start = sh7091.TMU.TCNT1;
+  while ((start - sh7091.TMU.TCNT1) < 20);
+
+  sh7091.TMU.TSTR &= (~tmu::tstr::str1::counter_start) & 0xff; // stop TCNT1
+}
+
+void scif_init(int bit_rate)
+{
+  using namespace scif;
+
+  sh7091.SCIF.SCSCR2 = 0; // disable transmission / reception
+
+  sh7091.SCIF.SCSPTR2 = 0; // clear output data pins
+
+  sh7091.SCIF.SCFCR2 = scfcr2::tfrst::reset_operation_enabled
+                     | scfcr2::rfrst::reset_operation_enabled;
+
+  sh7091.SCIF.SCSMR2 = scsmr2::chr::_8_bit_data
+		     | scsmr2::pe::parity_disabled
+		     | scsmr2::stop::_1_stop_bit
+		     | scsmr2::cks::p_phi_clock;
+
+  sh7091.SCIF.SCBRR2 = bit_rate; // bps = 1562500 / (SCBRR2 + 1)
+
+  sh7091.SCIF.SCFSR2 = (~scfsr2::er::bit_mask)
+		     & (~scfsr2::tend::bit_mask)
+		     & (~scfsr2::tdfe::bit_mask)
+		     & (~scfsr2::brk::bit_mask)
+		     & (~scfsr2::rdf::bit_mask)
+		     & (~scfsr2::dr::bit_mask)
+		     & 0xffff;
+
+
+  // wait 1 bit interval
+  scif_init_wait();
+
+  sh7091.SCIF.SCFCR2 = scfcr2::rtrg::trigger_on_1_byte
+		     | scfcr2::ttrg::trigger_on_8_bytes
+		     //| scfcr2::mce::modem_signals_enabled
+		     ;
+
+  sh7091.SCIF.SCSCR2 = scscr2::te::transmission_enabled
+                     | scscr2::re::reception_enabled;
+
+  sh7091.SCIF.SCLSR2 = 0; // clear ORER
+}
+
 void scif_character(const char c)
 {
   using namespace scif;

c/sh7091_scif.h

@@ -4,6 +4,8 @@
 extern "C" {
 #endif
 
+void scif_init_wait();
+void scif_init(int bit_rate);
 void scif_character(const char c);
 
 #ifdef __cplusplus

dreamcast

@@ -0,0 +1 @@
+../dreamcast

java.mk

@@ -0,0 +1,32 @@
+%.class: %.java
+	javac $<
+
+java/%.class: java/%.java
+	javac --source 8 --target 8 --boot-class-path . $<
+
+OBJ = \
+	c/decode.o \
+	c/class_file.o \
+	c/debug_class_file.o \
+	c/malloc.o \
+	c/execute.o \
+	c/memory_allocator.o \
+	c/class_resolver.o \
+	c/hash_table.o \
+	c/frame.o \
+	c/printf.o \
+	c/parse.o \
+	c/unparse.o \
+	c/native.o
+
+MAIN_DREAMCAST_OBJ = \
+	c/sh7091_scif.o \
+	c/main_dreamcast.o
+
+MAIN_HOSTED_OBJ = \
+	c/file.o \
+	c/main_hosted.o
+
+PRINT_CLASS_OBJ = \
+	c/file.o \
+	c/print_class.o

java/io/PrintStream.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_java_io_PrintStream_class_start __asm("_binary_java_io_PrintStream_class_start");
+extern uint32_t _binary_java_io_PrintStream_class_end __asm("_binary_java_io_PrintStream_class_end");
+extern uint32_t _binary_java_io_PrintStream_class_size __asm("_binary_java_io_PrintStream_class_size");
+
+#ifdef __cplusplus
+}
+#endif

java/io/PrintStream.java

@@ -0,0 +1,35 @@
+package java.io;
+
+import java.lang.String;
+
+public class PrintStream
+{
+    public PrintStream() {
+    }
+
+    private final byte[] newline = {'\n'};
+
+    public static native void write(byte[] buf);
+
+    public void println() {
+        write(newline);
+    }
+
+    public void println(byte[] buf) {
+        write(buf);
+        write(newline);
+    }
+
+    public void println(String s) {
+        write(s.getBytes());
+        write(newline);
+    }
+
+    public void print(byte[] buf) {
+        write(buf);
+    }
+
+    public void print(String s) {
+        write(s.getBytes());
+    }
+}

java/lang/Object.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_java_lang_Object_class_start __asm("_binary_java_lang_Object_class_start");
+extern uint32_t _binary_java_lang_Object_class_end __asm("_binary_java_lang_Object_class_end");
+extern uint32_t _binary_java_lang_Object_class_size __asm("_binary_java_lang_Object_class_size");
+
+#ifdef __cplusplus
+}
+#endif

java/lang/Object.java

@@ -1,5 +1,5 @@
 package java.lang;
 
-class Object {
+public class Object {
     public Object() {}
 }

java/lang/String.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_java_lang_String_class_start __asm("_binary_java_lang_String_class_start");
+extern uint32_t _binary_java_lang_String_class_end __asm("_binary_java_lang_String_class_end");
+extern uint32_t _binary_java_lang_String_class_size __asm("_binary_java_lang_String_class_size");
+
+#ifdef __cplusplus
+}
+#endif

java/lang/String.java

@@ -1,6 +1,6 @@
 package java.lang;
 
-class String {
+public class String {
     private final byte[] value;
 
     public String() {

java/lang/System.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_java_lang_System_class_start __asm("_binary_java_lang_System_class_start");
+extern uint32_t _binary_java_lang_System_class_end __asm("_binary_java_lang_System_class_end");
+extern uint32_t _binary_java_lang_System_class_size __asm("_binary_java_lang_System_class_size");
+
+#ifdef __cplusplus
+}
+#endif

java/lang/System.java

@@ -0,0 +1,13 @@
+package java.lang;
+
+import java.io.PrintStream;
+
+public final class System {
+    public static PrintStream out = null;
+
+    private System() {
+    }
+    static {
+        out = new PrintStream();
+    }
+}

p/Multiply.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_p_Multiply_class_start __asm("_binary_p_Multiply_class_start");
+extern uint32_t _binary_p_Multiply_class_end __asm("_binary_p_Multiply_class_end");
+extern uint32_t _binary_p_Multiply_class_size __asm("_binary_p_Multiply_class_size");
+
+#ifdef __cplusplus
+}
+#endif

p/Multiply.java

@@ -0,0 +1,10 @@
+package p;
+
+class Multiply {
+    static int test(int a, int b) {
+        return a * b;
+    }
+    public static void main() {
+        test(6, 8);
+    }
+}

p/Native.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern uint32_t _binary_p_Native_class_start __asm("_binary_p_Native_class_start");
+extern uint32_t _binary_p_Native_class_end __asm("_binary_p_Native_class_end");
+extern uint32_t _binary_p_Native_class_size __asm("_binary_p_Native_class_size");
+
+#ifdef __cplusplus
+}
+#endif

p/Native.java

@@ -0,0 +1,10 @@
+package p;
+
+import java.io.IOException;
+
+class Native {
+    public static void main() {
+        String foo = "hello Dreamcast";
+        System.out.println(foo);
+    }
+}