Create README.md

now can render window

.gitignore

@@ -6,6 +6,8 @@
 *.ko
 *.obj
 *.elf
+.*.swp
+*.gb
 
 # Linker output
 *.ilk

Makefile

@@ -1,18 +1,10 @@
-CC=tcc
-CFLAGS= -c -Wall -g -Wextra 
-SRC:=$(wildcard *.c)
-OBJ:=$(SRC:.c=.o)
+CFLAGS= -Wall -g
 
 all: gb
 
 clean:
-	make clean -C co/
-	rm -f $(OBJ)
+	rm -f *.o
 	rm -f gb
 	
-%.o: %.c gb.h
-	$(CC) $(CFLAGS) -o $@ $<	
-
 gb: $(OBJ)
-	make all -C co/
-	$(CC) co/*.o *.o -lucontext -lSDL2 -g  -o gb
+	$(CC) jmp.S *.c -lSDL2 -o gb $(CFLAGS) 

README.md

@@ -0,0 +1,4 @@
+# gameboy emulator
+
+* only for x86-64
+* dependency: sdl2

co/Makefile

@@ -1,15 +0,0 @@
-CC=tcc
-CFLAGS= -c -Wall -g
-SRC:=$(wildcard *.c)
-OBJ:=$(SRC:.c=.o)
-
-all: co
-
-clean:
-	rm -f $(OBJ)
-	
-%.o: %.c
-	$(CC) $(CFLAGS) -o $@ $<	
-
-co: $(OBJ)
-

co/README.md

@@ -1,2 +0,0 @@
-# coroutine library
-  https://github.com/Hojun-Cho/coroutine

co/channel.c

@@ -1,356 +0,0 @@
-#include "taskimpl.h"
-
-Channel*
-newchan(int elemsize, int bufsize)
-{
-  Channel* c;
-
-  c = malloc(sizeof *c + bufsize * elemsize);
-  if (c == 0) {
-    exit(1);
-  }
-  *c = (Channel){
-    .elemsize = elemsize,
-    .bufsize = bufsize,
-    .nbuf = 0,
-    .buf = (uchar*)&c[1],
-  };
-  return c;
-}
-
-void
-deletechan(Channel* c)
-{
-  if (c == 0)
-    return;
-  free(c->name);
-  free(c->asend.a);
-  free(c->arecv.a);
-  free(c);
-}
-
-static void
-addarray(Altarray* a, Alt* alt)
-{
-  if (a->n == a->m) {
-    a->m += 16;
-    a->a = realloc(a->a, a->m * sizeof a->a[0]);
-    if (a->a == nil) {
-      exit(1);
-    }
-  }
-  a->a[a->n++] = alt;
-}
-
-static void
-amove(void* dst, void* src, uint n)
-{
-  if (dst) {
-    if (src == nil)
-      memset(dst, 0, n);
-    else
-      memmove(dst, src, n);
-  }
-}
-
-static void
-delarray(Altarray* a, int i)
-{
-  --a->n;
-  a->a[i] = a->a[a->n];
-}
-
-static enum chan_op
-otherop(enum chan_op op)
-{
-  return (CHANSND + CHANRCV) - op;
-}
-
-static Altarray*
-chanarray(Channel* c, enum chan_op op)
-{
-  switch (op) {
-    default:
-      return nil;
-    case CHANSND:
-      return &c->asend;
-    case CHANRCV:
-      return &c->arecv;
-  }
-}
-
-/*
- * 3 players: sender, reciver, 'channel itself'
- * if chann.empty
- *			send(send to reciver);
- */
-static void
-altcopy(Alt* s, Alt* r)
-{
-  Channel* c;
-  uchar* cp;
-
-  if (s == nil && r == nil)
-    return;
-  assert(s != nil); /* sender must not nil */
-  c = s->c;
-  if (s->op == CHANRCV) {
-    Alt* t = s;
-    s = r;
-    r = t;
-  }
-  assert(s == nil || s->op == CHANSND); /* sender */
-  assert(r == nil || r->op == CHANRCV); /* reciver */
-
-  /* Channel is unbufferd */
-  if (s && r && c->nbuf == 0) {
-    amove(r->v, s->v, c->elemsize);
-    return;
-  }
-  if (r) {
-    /* recive buffred data first */
-    cp = c->buf + c->off * c->elemsize;
-    amove(r->v, cp, c->elemsize);
-    --c->nbuf;
-    if (++c->off == c->bufsize)
-      c->off = 0;
-  }
-  if (s) {
-    cp = c->buf + (c->off + c->nbuf) % c->bufsize * c->elemsize;
-    amove(cp, s->v, c->elemsize);
-    ++c->nbuf;
-  }
-}
-
-static void
-altdeque(Alt* a)
-{
-  Altarray* ar;
-
-  ar = chanarray(a->c, a->op);
-  if (ar == nil) {
-    exit(1);
-  }
-
-  for (uint i = 0; i < ar->n; ++i) {
-    if (ar->a[i] == a) {
-      delarray(ar, i);
-      return;
-    }
-  }
-  /* can't find self in altdq */
-  exit(1);
-}
-
-static void
-altqueue(Alt* a)
-{
-  Altarray* ar;
-
-  ar = chanarray(a->c, a->op);
-  addarray(ar, a);
-}
-
-static void
-altalldeque(Alt* a)
-{
-  for (int i = 0; a[i].op != CHANEND && a[i].op != CHANNOBLK; i++) {
-    if (a[i].op != CHANNOP)
-      altdeque(&a[i]);
-  }
-}
-
-static void
-altexec(Alt* a)
-{
-  Altarray* ar;
-  Channel* c;
-
-  c = a->c;
-  ar = chanarray(c, otherop(a->op));
-  if (ar && ar->n) {
-    int i = rand() % ar->n; /* find any other palyer */
-    Alt* other = ar->a[i];
-    altcopy(a, other);        /* copy data to other's buffer */
-    altalldeque(other->xalt); /* delete because now request is completed */
-    other->xalt[0].xalt = other;
-    taskready(other->task);
-  } else
-    altcopy(a, nil); /* if channel is unbufferd then do nothing */
-}
-
-static int
-altcanexec(Alt* a)
-{
-  Channel* c;
-
-  if (a->op == CHANNOP)
-    return 0;
-  c = a->c;
-  if (c->bufsize == 0) {
-    Altarray* ar = chanarray(c, otherop(a->op));
-    return ar && ar->n;
-  }
-  switch (a->op) {
-    default:
-      return 0;
-    case CHANSND:
-      return c->nbuf < c->bufsize;
-    case CHANRCV:
-      return c->nbuf > 0;
-  }
-}
-
-int
-chanalt(Alt* a)
-{
-  int i, j, ncan, n, canblock;
-  Task* t;
-
-  assertstack(512);
-  for (i = 0; a[i].op != CHANEND && a[i].op != CHANNOBLK; ++i)
-    ;
-  n = i;
-  canblock = (a[i].op == CHANEND);
-  t = taskrunning;
-  for (i = 0; i < n; ++i) {
-    a[i].task = t;
-    a[i].xalt = a;
-  }
-  ncan = 0;
-  for (i = 0; i < n; i++) {
-    if (altcanexec(&a[i])) {
-      ncan++;
-    }
-  }
-  if (ncan) {
-    j = rand() % ncan;
-    for (i = 0; i < n; ++i) {
-      if (altcanexec(&a[i])) {
-        if (j-- == 0) {
-          altexec(&a[i]);
-          return i;
-        }
-      }
-    }
-  }
-  if (canblock == 0)
-    return -1;
-  for (i = 0; i < n; ++i) {
-    if (a[i].op != CHANNOP)
-      altqueue(&a[i]);
-  }
-  taskswitch();
-  return a[0].xalt - a; /* calculate offset */
-}
-
-static int
-_chanop(Channel* c, int op, void* p, int canblock)
-{
-  Alt ar[2];
-
-  ar[0] = (Alt){
-    .c = c,
-    .op = op,
-    .v = p,
-  };
-  ar[1] = (Alt){
-    .op = canblock ? CHANEND : CHANNOBLK,
-  };
-  if (chanalt(ar) < 0)
-    return -1;
-  return 1;
-}
-
-int
-chansend(Channel* c, void* v)
-{
-  return _chanop(c, CHANSND, v, 1);
-}
-
-int
-chanbsend(Channel* c, void* v)
-{
-  return _chanop(c, CHANSND, v, 0);
-}
-
-int
-chanrecv(Channel* c, void* v)
-{
-  return _chanop(c, CHANRCV, v, 1);
-}
-
-int
-chanbrecv(Channel* c, void* v)
-{
-  return _chanop(c, CHANSND, v, 0);
-}
-
-int
-chansendp(Channel* c, void* v)
-{
-  return _chanop(c, CHANSND, &v, 1);
-}
-
-void*
-chanrecvp(Channel* c)
-{
-  void* v;
-
-  _chanop(c, CHANRCV, &v, 1);
-  return v;
-}
-
-int
-channbsendp(Channel* c, void* v)
-{
-  return _chanop(c, CHANSND, (void*)&v, 0);
-}
-
-void*
-channbrecvp(Channel* c)
-{
-  void* v;
-
-  _chanop(c, CHANRCV, &v, 0);
-  return v;
-}
-
-int
-chansendul(Channel* c, ulong v)
-{
-  return _chanop(c, CHANSND, &v, 1);
-}
-
-ulong
-chanrecvul(Channel* c)
-{
-  ulong v;
-
-  _chanop(c, CHANRCV, &v, 1);
-  return v;
-}
-
-int
-channbsendul(Channel* c, ulong v)
-{
-  return _chanop(c, CHANSND, &v, 0);
-}
-
-int
-channbrecvul(Channel* c, ulong v)
-{
-  return _chanop(c, CHANRCV, &v, 0);
-}
-
-int
-channbsend(Channel* c, void* v)
-{
-  return _chanop(c, CHANSND, v, 0);
-}
-
-int
-channbrecv(Channel* c, void* v)
-{
-  return _chanop(c, CHANRCV, v, 0);
-}

co/qlock.c

@@ -1,60 +0,0 @@
-#include "taskimpl.h"
-
-int
-_qlock(QLock* l, int block)
-{
-  if (l->owner == nil) {
-    l->owner = taskrunning;
-    return 1;
-  }
-  if (!block)
-    return 0;
-  addtask(&l->waiting, taskrunning);
-  taskswitch(); /* wait until own lock */
-  if (l->owner != taskrunning) {
-    /* TODO: */
-    exit(1);
-  }
-  return 1;
-}
-
-void
-qlock(QLock* l)
-{
-  _qlock(l, 1);
-}
-
-int
-canqlock(QLock* l)
-{
-  return _qlock(l, 0);
-}
-
-void
-qunlock(QLock* l)
-{
-  Task* ready;
-
-  if (l->owner == nil) {
-    /* TODO: */
-    exit(1);
-  }
-  l->owner = ready = l->waiting.head;
-  if (l->owner != nil) {
-    deltask(&l->waiting, ready);
-    taskready(ready);
-  }
-}
-
-QLock*
-newqlock()
-{
-  QLock* l;
-
-  l = malloc(sizeof *l);
-  if (l == nil)
-    exit(1);
-  l->owner = 0;
-  l->waiting = (Tasklist){ 0 };
-  return l;
-}

co/rendez.c

@@ -1,54 +0,0 @@
-#include "taskimpl.h"
-
-void
-tasksleep(Rendez* r)
-{
-  addtask(&r->waiting, taskrunning);
-  if (r->l)
-    qunlock(r->l);
-  taskswitch();
-  if (r->l)
-    qlock(r->l);
-}
-
-static int
-_taskwakeup(Rendez* r, int all)
-{
-  int i;
-  Task* t;
-
-  for (i = 0;; ++i) {
-    if (i == 1 && !all)
-      break;
-    if ((t = r->waiting.head) == nil)
-      break;
-    deltask(&r->waiting, t);
-    taskready(t);
-  }
-  return i;
-}
-
-int
-taskwakeup(Rendez* r)
-{
-  return _taskwakeup(r, 0);
-}
-
-int
-taskwakeupall(Rendez* r)
-{
-  return _taskwakeup(r, 1);
-}
-
-Rendez*
-newrendez(QLock* l)
-{
-  Rendez* r;
-
-  r = malloc(sizeof *r);
-  if (r == nil)
-    exit(1);
-  r->l = l;
-  r->waiting = (Tasklist){ 0 };
-  return r;
-}

co/task.c

@@ -1,253 +0,0 @@
-#include "taskimpl.h"
-#include <stdio.h>
-
-int taskcount;
-int taskidgen;
-int tasknswitch;
-int taskexitval;
-
-Task* taskrunning;
-ucontext_t taskschedcontext;
-Tasklist taskrunqueue;
-Task** alltask;
-int nalltask;
-
-static void
-contextswitch(ucontext_t* from, ucontext_t* to);
-void
-assertstack(uint n);
-
-static void
-taskinfo(int s)
-{
-  int i;
-  Task* t;
-  char* extra;
-
-  for (i = 0; i < nalltask; ++i) {
-    t = alltask[i];
-    if (t == taskrunning)
-      extra = " (running)";
-    else if (t->ready)
-      extra = " (ready)";
-    else
-      extra = "";
-    printf("%s\n", extra);
-  }
-}
-
-static void
-taskstart(uint x, uint y)
-{
-  Task* t;
-  ulong z;
-
-  z = x << 16;
-  z <<= 16;
-  z |= y;
-  t = (Task*)z;
-  t->startfn(t->startarg);
-  taskexit(0);
-}
-
-static Task*
-taskalloc(void (*fn)(void*), void* arg, uint stk)
-{
-  Task* t;
-  sigset_t zero;
-  uint x, y;
-  ulong z;
-
-  if ((t = malloc(sizeof *t + stk)) == nil) {
-    exit(1);
-  }
-  *t = (Task){
-    .stk = (uchar*)(&t[1]),
-    .stksize = stk,
-    .id = ++taskidgen,
-    .startfn = fn,
-    .startarg = arg,
-  };
-  sigemptyset(&zero);
-  sigprocmask(SIG_BLOCK, &zero, &t->uc.uc_sigmask);
-  if (getcontext(&t->uc)) {
-    exit(1);
-  }
-  t->uc.uc_stack.ss_sp = t->stk + 8;
-  t->uc.uc_stack.ss_size = t->stksize - 64;
-
-  z = (ulong)t;
-  y = z;
-  z >>= 16;
-  x = z >> 16;
-  makecontext(&t->uc, (void (*)())taskstart, 2, x, y);
-  return t;
-}
-
-int
-taskcreate(void (*fn)(void*), void* arg, uint stk)
-{
-  int id;
-  Task* t;
-
-  t = taskalloc(fn, arg, stk);
-  taskcount++;
-  id = t->id;
-  if (nalltask % 64 == 0) {
-    alltask = realloc(alltask, (nalltask + 64) * sizeof(alltask[0]));
-    if (alltask == 0) {
-      exit(1);
-    }
-  }
-  t->alltaskslot = nalltask;
-  alltask[nalltask++] = t;
-  taskready(t);
-  return id;
-}
-
-void
-taskready(Task* t)
-{
-  t->ready = 1;
-  addtask(&taskrunqueue, t);
-}
-
-void
-taskswitch(void)
-{
-  assertstack(0);
-  contextswitch(&taskrunning->uc, &taskschedcontext);
-}
-
-int
-taskyield(void)
-{
-  int n;
-
-  n = tasknswitch;
-  taskready(taskrunning);
-  taskswitch();
-  return tasknswitch - n - 1;
-}
-
-void
-taskexit(int val)
-{
-  taskexitval = val;
-  taskrunning->exiting = 1;
-  taskswitch();
-}
-
-void
-taskexitall(int val)
-{
-  exit(val);
-}
-
-void
-deltask(Tasklist* l, Task* t)
-{
-  if (t->prev)
-    t->prev->next = t->next;
-  else
-    l->head = t->next;
-  if (t->next)
-    t->next->prev = t->prev;
-  else
-    l->tail = t->prev;
-}
-
-void
-addtask(Tasklist* l, Task* t)
-{
-  if (l->tail) {
-    l->tail->next = t;
-    t->prev = l->tail;
-  } else {
-    l->head = t;
-    t->prev = nil;
-  }
-  l->tail = t;
-  t->next = nil;
-}
-
-static void
-contextswitch(ucontext_t* from, ucontext_t* to)
-{
-  if (swapcontext(from, to) < 0) {
-    printf("swapcontext is fail\n");
-    exit(1);
-  }
-}
-
-void
-assertstack(uint n)
-{
-  Task* t;
-
-  t = taskrunning;
-  if ((uchar*)&t <= (uchar*)t->stk || (uchar*)&t - (uchar*)t->stk < 256 + n) {
-    /* satck over flow */
-    exit(1);
-  }
-}
-
-static void
-taskscheduler(void)
-{
-  int i;
-  Task* t;
-
-  for (;;) {
-    if (taskcount == 0)
-      exit(taskexitval);
-    t = taskrunqueue.head;
-    if (t == nil) {
-      /* nothing to do */
-      exit(1);
-    }
-    deltask(&taskrunqueue, t); /* delete from runqueue */
-    t->ready = 0;
-    taskrunning = t;
-    tasknswitch++;
-    contextswitch(&taskschedcontext, &t->uc);
-    taskrunning = nil; /* ready for next task */
-    if (t->exiting) {
-      taskcount--;
-      i = t->alltaskslot;
-      alltask[i] = alltask[--nalltask];
-      alltask[i]->alltaskslot = i;
-      free(t);
-    }
-  }
-}
-
-static char* argv0;
-static int taskargc;
-static char** taskargv;
-int mainstacksize;
-
-static void
-taskmainstart(void* v)
-{
-  taskmain(taskargc, taskargv);
-}
-
-int
-main(int argc, char** argv)
-{
-  struct sigaction sa, osa;
-
-  memset(&sa, 0, sizeof(sigaction));
-  sa.sa_handler = taskinfo;
-  sa.sa_flags = SA_RESTART;
-  sigaction(SIGQUIT, &sa, &osa);
-  /*sigaction(SIGINFO, &sa, &osa);*/
-  argv0 = argv[0];
-  taskargc = argc;
-  taskargv = argv;
-  mainstacksize = 256 * 1024;
-  taskcreate(taskmainstart, nil, mainstacksize);
-  taskscheduler();
-  exit(0);
-}

co/task.h

@@ -1,138 +0,0 @@
-#ifndef _TASK_H_
-#define _TASK_H_
-
-typedef struct Task Task;
-typedef struct Tasklist Tasklist;
-
-struct Tasklist
-{
-  Task* head;
-  Task* tail;
-};
-
-typedef struct QLock
-{
-  Task* owner;
-  Tasklist waiting;
-} QLock;
-
-void
-taskmain(int argc, char** argv);
-int
-taskyield(void);
-void
-taskexitall(int val);
-int
-taskcreate(void (*fn)(void*), void* arg, unsigned int stk);
-void
-taskready(Task* t);
-void
-taskexit(int val);
-void
-taskswitch(void);
-void
-assertstack(unsigned int n);
-
-void
-qlock(QLock*);
-int
-canqlock(QLock*);
-void
-qunlock(QLock*);
-QLock*
-newqlock();
-
-typedef struct Rendez Rendez;
-struct Rendez
-{
-  QLock* l;
-  Tasklist waiting;
-};
-
-void
-tasksleep(Rendez*);
-int
-taskwakeup(Rendez*);
-int
-taskwakeupall(Rendez*);
-Rendez*
-newrendez(QLock* l);
-
-extern Task* taskrunning;
-extern int taskcount;
-
-typedef struct Alt Alt;
-typedef struct Altarray Altarray;
-typedef struct Channel Channel;
-
-enum chan_op
-{
-  CHANEND,
-  CHANSND,
-  CHANRCV,
-  CHANNOP,
-  CHANNOBLK,
-};
-
-struct Alt
-{
-  Channel* c;
-  void* v;
-  enum chan_op op;
-  Task* task;
-  Alt* xalt;
-};
-
-struct Altarray
-{
-  Alt** a;
-  unsigned int n;
-  unsigned int m;
-};
-
-struct Channel
-{
-  unsigned int bufsize;
-  unsigned int elemsize;
-  unsigned char* buf;
-  unsigned int nbuf;
-  unsigned int off;
-  Altarray asend;
-  Altarray arecv;
-  char* name;
-};
-
-Channel*
-newchan(int elemsize, int bufsize);
-void
-deletechan(Channel* c);
-int
-chansend(Channel* c, void* v);
-int
-chanbsend(Channel* c, void* v);
-int
-chanrecv(Channel* c, void* v);
-int
-chanbrecv(Channel* c, void* v);
-int
-chansendp(Channel* c, void* v);
-void*
-chanrecvp(Channel* c);
-int
-channbsend(Channel* c, void* v);
-int
-channbsendp(Channel* c, void* v);
-void*
-channbrecvp(Channel* c);
-int
-channbrecv(Channel* c, void* v);
-int
-chansendul(Channel* c, unsigned long v);
-unsigned long
-chanrecvul(Channel* c);
-int
-channbsendul(Channel* c, unsigned long v);
-int
-channbrecvul(Channel* c, unsigned long v);
-
-#endif

co/taskimpl.h

@@ -1,44 +0,0 @@
-#include "task.h"
-#include <assert.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ucontext.h>
-
-#define nil ((void*)0)
-#define nelem(x) (sizeof(x) / sizeof((x)[0]))
-
-typedef unsigned long ulong;
-typedef unsigned int uint;
-typedef unsigned char uchar;
-typedef unsigned long long uvlong;
-typedef long long vlong;
-
-enum
-{
-  STACK = 8192,
-};
-
-struct Task
-{
-  Task* next;
-  Task* prev;
-  Task* allnext;
-  Task* allprev;
-  ucontext_t uc;
-  uvlong alarmtime;
-  uint id;
-  uchar* stk;
-  uint stksize;
-  int exiting;
-  int alltaskslot;
-  int ready;
-  void (*startfn)(void*);
-  void* startarg;
-};
-
-void
-deltask(Tasklist* l, Task* t);
-
-void
-addtask(Tasklist* l, Task* t);

cpu.c

@@ -1,5 +1,5 @@
 #include "gb.h"
-#include <stdio.h>
+#include "print.h"
 
 #define BC() ((u16)r[rB] << 8 | r[rC])
 #define DE() ((u16)r[rD] << 8 | r[rE])
@@ -30,10 +30,13 @@ u8 r[8], ime;
 u16 pc, sp, curpc;
 int halt;
 
+Var cpuvars[] = {ARR(r), VAR(ime), VAR(pc), VAR(curpc), VAR(sp), VAR(halt),
+									{nil, 0, 0}};
+
 void
 state(void)
 {
-  printf("A:%02X F:%02X B:%02X C:%02X D:%02X E:%02X H:%02X L:%02X SP:%04X "
+  print("A:%02X F:%02X B:%02X C:%02X D:%02X E:%02X H:%02X L:%02X SP:%04X "
          "PC:%04X PCMEM:%02X,%02X,%02X,%02X\n",
          r[rA],
          r[rF],

error.c

@@ -1,30 +1,29 @@
 #include "gb.h"
-#include <stdarg.h>
-#include <stdio.h>
+#include "print.h"
 #include <stdlib.h>
 #include <string.h>
 
 void
-panic(const char* fmt, ...)
+panic(char* fmt, ...)
 {
   va_list ap;
 
   va_start(ap, fmt);
-  fprintf(stderr, "panic:");
-  vfprintf(stderr, fmt, ap);
-  fprintf(stderr, "\n");
+  fprint(2, "panic:");
+  vfprint(2, fmt, ap);
+  fprint(2, "\n");
   exit(1);
 }
 
 void
-error(const char* fmt, ...)
+error(char* fmt, ...)
 {
   va_list ap;
 
   va_start(ap, fmt);
-  fprintf(stderr, "panic:");
-  vfprintf(stderr, fmt, ap);
-  fprintf(stderr, "\n");
+  fprint(2, "panic:");
+  vfprint(2, fmt, ap);
+  fprint(2, "\n");
 }
 
 void*

eui.c

@@ -9,7 +9,7 @@ u8* pic;
 SDL_Renderer* renderer;
 SDL_Texture* bitmapTex;
 
-static void
+void
 render()
 {
   SDL_UpdateTexture(bitmapTex, nil, pic, 160 * sizeof(u32));
@@ -29,6 +29,8 @@ joypadevent(void*_)
     case SDL_KEYUP: keys = 0; break;
     case SDL_KEYDOWN:
       switch (evt.key.keysym.scancode) {
+				case SDL_SCANCODE_F1: savereq = 1; break;
+				case SDL_SCANCODE_F2: loadreq = 1; break;
         case SDL_SCANCODE_X: keys = GB_KEY_A; break;
         case SDL_SCANCODE_Z: keys = GB_KEY_B; break;
         case SDL_SCANCODE_UP: keys = GB_KEY_UP; break;
@@ -45,12 +47,6 @@ joypadevent(void*_)
   return;
 }
 
-void
-flush()
-{
-  render();
-}
-
 void
 initwindow(int scale)
 {

ev.c

@@ -1,8 +1,11 @@
 #include "gb.h"
 
 Event evhblank, evjoypad;
+Event *events[NEVENT] = {&evhblank, &evjoypad};
 Event* elist;
 
+Var evvars[] = {{nil, 0, 0}};
+
 void
 addevent(Event* ev, int time)
 {

gb.c

@@ -1,40 +1,95 @@
 #include "gb.h"
-#include "co/task.h"
-#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
 
-int cpuhalt;
-int backup;
+int savereq, loadreq;
 int savefd = -1;
-u64 clock;
-u8 mbc, feat, mode;
+int saveframes;
+const char *romname;
+u8 mbc, mode;
+
+void
+writeback(void)
+{
+	if(saveframes == 0)
+		saveframes = 15;
+}
+
+void
+flushback(void)
+{
+	if(savefd >= 0)
+		pwrite(savefd, back, nback, 0);
+	saveframes = 0;
+}
+
+static void
+_flushback(void)
+{
+	flushback();
+	close(savefd);
+}
+
+static void
+loadsave(const char *file)
+{
+	u8 *buf, *p;
+
+	buf = xalloc(strlen(file) + 4);
+	strcpy(buf, file);
+	p = strrchr(buf, '.');
+	if(p == nil)
+		p = buf + strlen(buf);
+	strcpy(p, ".sav");
+	savefd = open(buf, O_RDWR);
+	if(savefd == -1){
+		savefd = open(buf, O_RDWR|O_CREAT, 0664);
+		if(savefd == -1)
+			error("Can't load save file '%s'", file);
+		back = xalloc(nback);
+		if(write(savefd, back, nback)!= nback)
+			error("Can't Write %d byte to savefile", nback);
+		atexit(_flushback);
+		free(buf);
+		return;
+	}
+	back = xalloc(nback);
+	if(read(savefd, back, nback) != nback)
+		error("savefile size is not matched\n");
+	atexit(_flushback);
+	free(buf);
+}
 
 static void
 loadrom(const char* file)
 {
-  FILE* f;
+  int rc;
+  int feat;
+  int fd;
   long sz;
   static u8 mbctab[31] = { 0, 1, 1, 1, -1, 2, 2, -1, 0,  0, -1, 6, 6, 6, -1, 3,
                            3, 3, 3, 3, -1, 4, 4, 4,  -1, 5, 5,  5, 5, 5, 5 };
-	static u8 feattab[31] = {
-		0, 0, FEATRAM, FEATRAM|FEATBAT, 0, FEATRAM, FEATRAM|FEATBAT, 0,
-		FEATRAM, FEATRAM|FEATBAT, 0, 0, FEATRAM, FEATRAM|FEATBAT, 0, FEATTIM|FEATBAT,
-		FEATTIM|FEATRAM|FEATBAT, 0, FEATRAM, FEATRAM|FEATBAT, 0, 0, FEATRAM, FEATRAM|FEATBAT,
-		0, 0, FEATRAM, FEATRAM|FEATBAT, 0, FEATRAM, FEATRAM|FEATBAT,
-	};
+  static u8 feattab[31] = {
+  	0, 0, FEATRAM, FEATRAM|FEATBAT, 0, FEATRAM, FEATRAM|FEATBAT, 0,
+  	FEATRAM, FEATRAM|FEATBAT, 0, 0, FEATRAM, FEATRAM|FEATBAT, 0, FEATTIM|FEATBAT,
+  	FEATTIM|FEATRAM|FEATBAT, 0, FEATRAM, FEATRAM|FEATBAT, 0, 0, FEATRAM, FEATRAM|FEATBAT,
+  	0, 0, FEATRAM, FEATRAM|FEATBAT, 0, FEATRAM, FEATRAM|FEATBAT,
+  };
 	
-  f = fopen(file, "r");
-  if (f == nil)
+  fd = open(file, O_RDONLY);
+  if (fd == nil)
     panic("can't open %s", file);
-  fseek(f, 0, SEEK_END);
-  sz = ftell(f);
-  if (sz < 0 || sz > 32 * 1024 * 1024)
-    panic("bad size %d", sz);
-  fseek(f, 0, SEEK_SET);
+  sz = lseek(fd, 0, SEEK_END);
+  if(sz <= 0 || sz > 32*1024*1024)
+  	panic("invalid file size %d", sz);
+  lseek(fd, 0, SEEK_SET);
   nrom = sz;
   rom = xalloc(nrom);
-  if (fread(rom, 1, nrom, f) != nrom)
-    panic("siz is different %z", nrom);
-  fclose(f);
+  if((rc = read(fd, rom, nrom)) != nrom)
+	  panic("rom size is not matched %d\n", rc);
+  close(fd);
   if (rom[0x147] > 0x1F)
     panic("bad cartidge type %d\n", rom[0x147]);
   mbc = mbctab[rom[0x147]];
@@ -48,7 +103,6 @@ loadrom(const char* file)
 		default: panic("Unkown Ram size %d\n", rom[0x149]);
 		}
 	}
-	back = xalloc(nback);
 	if(nback == 0)
 		nbackbank = 1;
 	else
@@ -58,18 +112,40 @@ loadrom(const char* file)
       break;
     default: panic("unsupported mbc %d", mbc);
   }
-  if ((rom[0x143] & 0x80) != 0 && (mode & FORCEDMG) == 0)
-    mode = CGB | COL;
+  if (rom[0x143] & 0x80 != 0)
+		panic("unsupported color");
+	if((feat & FEATBAT) != 0)
+		loadsave(file);
+}
+
+void
+flush()
+{
+	static char *savestatename;
+	if (savestatename == 0){
+		int len = strlen(romname);
+		savestatename = xalloc(len + 4);
+		strncpy(savestatename, romname, len);
+		strcpy(savestatename + len, "-state.save");
+	}
+
+  render();
+	if(saveframes > 0 && -- saveframes == 0)
+		flushback();
+	if(savereq){
+		savestate(savestatename);
+		savereq = 0;
+	}
+	if(loadreq){
+		loadstate(savestatename);
+		loadreq = 0;
+	}
 }
 
 static void
 colinit(void)
 {
-  union
-  {
-    u8 c[4];
-    u32 l;
-  } c;
+  union {u8 c[4]; u32 l;}c;
 
   c.c[3] = 0;
   for (int i = 0; i < 4; i++) {
@@ -78,16 +154,16 @@ colinit(void)
   }
 }
 
-void
-taskmain(int argc, char* argv[])
+int
+main(int argc, char* argv[])
 {
+  loadrom(romname = argv[1]);
   colinit();
-  loadrom(argv[1]);
   initwindow(5);
   initevent();
   meminit();
   reset();
-  taskcreate(pputask, 0, 32768);
+	ppuinit();
 
   for (;;) {
     int t = step();

gb.h

@@ -1,5 +1,9 @@
 #include <stdint.h>
 
+#define nelem(x) (sizeof(x)/sizeof(x[0]))
+
+#define VAR(a) {&a, sizeof(a), 1}
+#define ARR(a) {a, sizeof(*a), nelem(a)}
 #define nil ((void*)0)
 #define JOYPAD_CYCLE (30)
 
@@ -128,6 +132,14 @@ enum
   GB_KEY_START = 0x80
 };
 
+enum { NEVENT = 2 };
+
+enum
+{
+	REG_RIP = 7,
+	REG_RSP = 6,
+};
+
 typedef uint8_t u8;
 typedef uint16_t u16;
 typedef int8_t i8;
@@ -136,6 +148,7 @@ typedef int32_t i32;
 typedef uint64_t u64;
 typedef int64_t i64;
 typedef struct Event Event;
+typedef struct Var Var;
 
 struct Event
 {
@@ -145,6 +158,15 @@ struct Event
   void* aux;
 };
 
+struct Var
+{
+	void *a;
+	int s, n;
+};
+
+#define VAR(a) {&a, sizeof(a), 1}
+#define ARR(a) {a, sizeof(*a), nelem(a)}
+
 extern u8 *rom, *back, reg[256], oam[256];
 extern u8 vram[16384];
 extern int nrom, nback, nbackbank;
@@ -152,17 +174,18 @@ extern u32 pal[64];
 extern u8 dma;
 extern u32 divclock;
 extern u64 clock;
-extern u8 ppuy, ppustate, ppuw;
+extern u8 ppuy, ppustate;
 extern u8 keys;
 extern int prish;
 extern u8 mode;
-extern u8 mbc, feat;
+extern u8 mbc;
 extern Event* elist;
 extern Event evhblank, evjoypad;
 extern u32 moncols[4];
-extern u32 white;
 extern u8* pic;
 extern int (*mapper)(int, int);
+extern Event *events[NEVENT];
+extern int savereq, loadreq;
 
 /* joypad */
 void
@@ -192,7 +215,7 @@ hblanktick(void*);
 void
 ppusync(void);
 void
-pputask(void*);
+ppuinit(void);
 
 /* cpu */
 int
@@ -202,14 +225,28 @@ reset(void);
 
 /* graphic */
 void
-flush();
-void
 initwindow(int scale);
+void
+render();
+
+/* save */
+void
+putvars(Var *v);
+void
+getvars(Var *v);
+void
+flush();
+int
+savestate(const char *fname);
+int
+loadstate(const char *fname);
+void
+writeback(void);
 
 /* error */
 void
-error(const char*, ...);
+error(char*, ...);
 void
-panic(const char*, ...);
+panic(char*, ...);
 void*
 xalloc(long);

jmp.S

@@ -0,0 +1,30 @@
+.global psetjmp
+.type psetjmp,@function
+psetjmp:
+	mov %rbx,(%rdi)         /* rdi is jmp_buf, move registers onto it */
+	mov %rbp,8(%rdi)
+	mov %r12,16(%rdi)
+	mov %r13,24(%rdi)
+	mov %r14,32(%rdi)
+	mov %r15,40(%rdi)
+	lea 8(%rsp),%rdx        /* this is our rsp WITHOUT current ret addr */
+	mov %rdx,48(%rdi)
+	mov (%rsp),%rdx         /* save return addr ptr for new rip */
+	mov %rdx,56(%rdi)
+	xor %eax,%eax           /* always return 0 */
+	ret
+
+.global plongjmp
+.type plongjmp,@function
+plongjmp:
+	xor %eax,%eax
+	cmp $1,%esi             /* CF = val ? 0 : 1 */
+	adc %esi,%eax           /* eax = val + !val */
+	mov (%rdi),%rbx         /* rdi is the jmp_buf, restore regs from it */
+	mov 8(%rdi),%rbp
+	mov 16(%rdi),%r12
+	mov 24(%rdi),%r13
+	mov 32(%rdi),%r14
+	mov 40(%rdi),%r15
+	mov 48(%rdi),%rsp
+	jmp *56(%rdi)     

mem.c

@@ -9,17 +9,18 @@ u8* rom;
 u8 *romb, *vramb, *wramb, *eramb;
 u8 wram[32768], vram[16384], oam[256], reg[256];
 u8* back;
-u8 palm[128];
 u32 pal[64];
 int nrom, nback, nbackbank;
+u64 clock;
 u32 divclock;
 int prish;
-u8 dma;
 u32 moncols[4];
 u32 white;
 int (*mappers[])(int, int) = { mbc0, mbc1 };
 int (*mapper)(int, int);
 
+Var memvars[] = {ARR(wram), ARR(vram), ARR(oam), ARR(reg), VAR(clock), VAR(divclock), {nil, 0, 0}};
+
 static u8
 regread(u16 a)
 {
@@ -70,7 +71,6 @@ regwrite(u16 a, u8 v)
       ppusync();
       if ((~v & reg[a] & LCDEN) != 0) {
         ppuy = 0;
-        ppuw = 0;
         ppustate = 0;
         delevent(&evhblank);
       }
@@ -159,6 +159,7 @@ memwrite(u16 a, u8 v)
         eramb[a - 0xa000] = v;
       else
         mapper(a, v);
+			writeback();
       return;
     case 12: case 14:
       wram[a & 0xFFF] = v;
@@ -198,29 +199,29 @@ static int
 mbc1(int a, int v)
 {
 	static u8 ramen, b0, b1, romram;
+	static Var mbc1vars[] = {VAR(ramen), VAR(b0), VAR(b1), VAR(romram),
+														{nil, 0,0}};
 	u16 b;
 
 	if (a < 0) {
 		switch(a) {
 		case INIT: return 0;
-		case SAVE:
-		case RSTR:
-			break;
-		case READ:
-			return -1;
+		case SAVE: putvars(mbc1vars); break;
+		case RSTR: getvars(mbc1vars); break;
+		case READ: return -1;
 		default: panic("MBC1 does not have function of %d", a);
 		}
 	}
 	switch (a >> 13) {
 	case 0: ramen = (v & 0xF) == 0xA; break;
 	case 1: v &= 0x1F; b0 = v != 0 ? v : 1; break;
-	case 2: b1 = v & 3; b1 % nbackbank; break;
+	case 2: b1 = v & 3; b1 %= nbackbank; break;
 	case 3: romram = v & 1; break;
 	}
 	b = b0;
 	if (romram == 0)
 		b |= b1 << 5;
-	b %= nrom >> 14; /* 32KB => 2bank */
+	b %= nrom >> 14;
 	romb = rom + (b << 14);
 	if (ramen) {
 		if (romram)
@@ -234,13 +235,9 @@ mbc1(int a, int v)
 }
 
 void
-meminit(void)
+meminit()
 {
-  union
-  {
-    u8 c[4];
-    u32 l;
-  } c;
+  union {u8 c[4]; u32 l;}c;
 
   c.c[0] = c.c[1] = c.c[2] = 0;
   c.c[3] = 1;
@@ -248,14 +245,12 @@ meminit(void)
     c.l >>= 1;
   c.c[0] = c.c[1] = c.c[2] = 0xff;
   c.c[3] = 0;
-  white = c.l;
 
   romb = rom + 0x4000;
   wramb = wram + 0x1000;
   vramb = vram;
   mapper = mappers[mbc];
   mapper(INIT, 0);
-
   reg[LCDC] = 0x91;
   reg[IF] = 0xE0;
   reg[SVBK] = 0xff;

ppu.c

@@ -1,15 +1,17 @@
-#include "co/task.h"
 #include "gb.h"
 #include <string.h>
 
+#define ryield() {if(psetjmp(renderjmp) == 0) plongjmp(mainjmp, 1);}
+#define myield() {if(psetjmp(mainjmp) == 0) plongjmp(renderjmp, 1);}
 #define eat(nc)                                                                \
   if (cyc <= nc) {                                                             \
     for (i = 0; i < nc; i++)                                                   \
       if (--cyc == 0)                                                          \
-        taskyield();                                                           \
+        ryield();                                                           \
   } else                                                                       \
     cyc -= nc;
 
+typedef void *jmp_buf[10];
 typedef struct sprite sprite;
 struct sprite
 {
@@ -31,19 +33,28 @@ enum
   TILSPR = 0x04,
 };
 
-u8 ppustate, ppuy, ppuw;
+jmp_buf mainjmp,renderjmp;
+u8 ppustate, ppuy;
 u64 hblclock, rendclock;
 static int cyc, ppux, ppux0;
 sprite spr[10], *sprm;
 
-void
-pputask(void* _)
+Var ppuvars[] = {VAR(ppustate), VAR(ppuy), VAR(hblclock), VAR(rendclock),
+									{nil, 0, 0}};
+
+extern int psetjmp(jmp_buf buf);
+extern void plongjmp(jmp_buf buf, int v);
+
+static void
+ppurender(void)
 {
   int x, y, i, n, m, win;
   u16 ta, ca, chr;
   u8 tile;
   u32 sr[8], *picp;
 
+	ryield();
+
   for (;;) {
     eat(6 * 2);
     m = 168 + (reg[SCX] & 7);
@@ -79,7 +90,7 @@ pputask(void* _)
       if (cyc <= 2 * 8) {
         for (i = 0; i < 2 * 8; ++i)
           if (--cyc == 0)
-            taskyield();
+            ryield();
         y = ppuy + reg[SCY] << 1 & 14;
         ta = 0x1800 | reg[LCDC] << 7 & 0x400 | ppuy + reg[SCY] << 2 & 0x3E0 |
              ta & 0x1F;
@@ -99,13 +110,13 @@ pputask(void* _)
     } while (m > 8);
     if (win == -1) {
       win = 1;
-      ta = 0x1800 | reg[LCDC] << 4 & 0x400 | ppuw - reg[WY] << 2 & 0x3E0;
-      y = ppuw - reg[WY] << 1 & 14;
-      cyc += 2;
+      ta = 0x1800 | reg[LCDC] << 4 & 0x400 | ppuy - reg[WY] << 2 & 0x3E0;
+      y = ppuy - reg[WY] << 1 & 14;
+      cyc += 12;
       m = 175 - reg[WX];
       goto restart;
     }
-    taskyield();
+    ryield();
   }
 }
 
@@ -182,11 +193,11 @@ sprites(void)
     for (; x < x1; ++x) {
       attr = picp[x] >> prish;
       chr = q->chr;
-      if ((chr & ((q->t & SPRXFL) != 0 ? 0x0101 : 0x8080)) != 0 &&
+      if((chr & ((q->t & SPRXFL) != 0 ? 0x0101 : 0x8080)) != 0 &&
           (attr & TILSPR) == 0 &&
           ((mode & COL) != 0 && (reg[LCDC] & BGPRI) == 0 ||
            (attr & TILCOL0) != 0 ||
-           (attr & TILPRI) == 0 && (q->t & SPRPRI) == 0)) {
+           (attr & TILPRI) == 0 && (q->t & SPRPRI) == 0)){
         if ((q->t & SPRXFL) == 0)
           picp[x] = pal[q->pal | chr >> 15 | chr >> 6 & 2] | TILSPR << prish;
         else
@@ -208,7 +219,7 @@ ppusync(void)
     return;
   cyc = clock - rendclock;
   if (cyc != 0)
-    taskyield();
+    myield();
   sprites();
   rendclock = clock;
 }
@@ -234,8 +245,6 @@ hblanktick(void* _)
   switch (ppustate) {
   case 0:
     hblclock = clock + evhblank.time;
-    if (reg[WX] <= 166 && reg[WY] <= 143)
-      ppuw++;
     if (++ppuy == 144) {
       ppustate = 1;
       if (reg[STAT] & IRQM1)
@@ -254,11 +263,8 @@ hblanktick(void* _)
     break;
   case 1:
     hblclock = clock + evhblank.time;
-    if (reg[WX] <= 166 && reg[WY] <= 143)
-      ppuw++;
     if (++ppuy == 154) {
       ppuy = 0;
-      ppuw = 0;
       ppustate = 2;
       if (reg[STAT] & IRQM2)
         reg[IF] |= IRQLCDS;
@@ -284,3 +290,13 @@ hblanktick(void* _)
     break;
   }
 }
+
+void
+ppuinit(void)
+{
+	static u8 stk[8192];
+
+	renderjmp[REG_RSP] = stk + sizeof(stk) - 64;
+	renderjmp[REG_RIP] = ppurender;
+	myield();
+}

print.c

@@ -0,0 +1,222 @@
+#include "print.h"
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <assert.h>
+
+enum
+{
+	FlagLong = 1<<0,
+	FlagLongLong = 1<<1,
+	FlagUnsigned = 1<<2,
+};
+
+static char*
+printstr(char *dst, char *edst, char *s, int sz)
+{
+	int l, n, isneg;
+
+	isneg = 0;
+	if(sz < 0){
+		sz = -sz;
+		isneg = 1;
+	}
+	if(dst >= edst)
+		return dst;
+	n = l = strlen(s);
+	if(n < sz)
+		n = sz;
+	if(n >= edst - dst)
+		n = (edst - dst) - 1;
+	if(l > n)
+		l = n;
+	if(isneg){
+		memmove(dst, s, l);
+		if(n - l)
+			memset(dst + l, ' ', n - l);
+	}else{
+		if(n - l)
+			memset(dst, ' ', n - l);
+		memmove(dst + n - l, s, l);
+	}
+	return dst + n;
+}
+
+char*
+vseprint(char *dst, char *edst, char *fmt, va_list arg)
+{
+	int fl, sz, sign, base;
+	char *p, *w;
+	char cbuf[2];
+
+	w = dst;
+	for(p = fmt; *p && w < edst - 1; p++){
+		switch(*p){
+		default:
+			*w++ = *p;
+			break;
+		case '%':
+			sign = 1;
+			fl = sz = 0;
+			for(p++; *p; p++){
+				switch(*p){
+				case '-': sign = -1; break;
+				case '0': case '1': case '2': case '3': case '4':
+				case '5': case '6': case '7': case '8': case '9':
+					sz = sz * 10  + *p - '0';
+					break;
+				case 'l': if(fl & FlagLong)fl |= FlagLongLong;break;
+				case 'u': fl |= FlagUnsigned; break;
+				case 'i': case 'd': 
+					base = 10; goto num;
+				case 'o': base = 8; goto num;
+				case 'p': case 'x': case 'X':
+					base = 16;
+					goto num;
+				num:
+				{
+					static char digits[] = "0123456789abcdef";
+					char buf[30], *p;
+					int neg, zero;
+					unsigned long long luv;
+
+					if(fl & FlagLongLong){
+						if(fl & FlagUnsigned)
+							luv = va_arg(arg,  unsigned long long);
+						else
+							luv = va_arg(arg, long long);
+					}else{
+						if(fl & FlagLong){
+							if(fl & FlagUnsigned)
+								luv = va_arg(arg, unsigned long);
+							else
+								luv = va_arg(arg, long);
+						}else{
+							if(fl & FlagUnsigned)
+								luv = va_arg(arg, unsigned int);
+							else
+								luv = va_arg(arg, int);
+						}
+					}
+					p = buf + sizeof(buf);
+					neg = zero = 0;
+					if((fl & FlagUnsigned) == 0 && (long long)luv < 0){
+						neg = 1;
+						luv = -luv;
+					}
+					if(luv == 0)
+						zero  = 1;
+					*--p = 0;
+					while(luv){
+						*--p = digits[luv % base];
+						luv /= base;
+					}
+					if(base == 16){
+						*--p = 'x';
+						*--p = '0';
+					}
+					if(base == 8 || zero)
+						*--p = '0';
+					w = printstr(w, edst,p, sz * sign);	
+					goto break2;
+				}
+				case 'c':
+					cbuf[0] = va_arg(arg, int);
+					cbuf[1] = 0;
+					w = printstr(w, edst, cbuf, sz * sign);
+					goto break2;
+				case 's':
+					w = printstr(w, edst, va_arg(arg, char*), sz*sign);
+					goto break2;
+				case 'r':
+					w = printstr(w, edst, strerror(errno), sz*sign);
+					goto break2;
+				default:
+					p = "error";
+					goto break2;
+				}
+			}
+			break2:
+				break;
+		}
+	}
+	assert(w < edst);
+	*w = 0;
+	return dst;
+}
+
+char*
+vsnprint(char *dst, unsigned int n, char *fmt, va_list arg)
+{
+	return vseprint(dst, dst + n, fmt, arg);
+}
+
+char*
+snprint(char *dst, unsigned int n, char *fmt, ...)
+{
+	va_list arg;
+
+	va_start(arg, fmt);
+	vsnprint(dst, n, fmt, arg);
+	va_end(arg);
+	return dst;
+}
+
+char*
+seprint(char* dst, char* edst, char* fmt, ...)
+{
+	va_list arg;
+
+	va_start(arg, fmt);
+	vseprint(dst, edst, fmt, arg);
+	va_end(arg);
+	return dst;
+}
+
+int
+vfprint(int fd, char *fmt, va_list arg)
+{
+	char buf[1024];
+
+	vseprint(buf, buf + sizeof buf, fmt, arg);
+	return write(fd, buf, strlen(buf));
+}
+
+
+int
+vprint(char *fmt, va_list arg)
+{
+	return vfprint(1, fmt, arg);
+}
+
+int
+fprint(int fd, char *fmt, ...)
+{
+	int n;
+	va_list arg;
+
+	va_start(arg, fmt);
+	n = vfprint(fd, fmt, arg);
+	va_end(arg);
+	return n;
+}
+
+int
+print(char *fmt, ...)
+{
+	int n;
+	va_list arg;
+
+	va_start(arg, fmt);
+	n = vprint(fmt, arg);
+	va_end(arg);
+	return n;
+}
+
+char*
+strecpy(char *dst, char *edst, char *src)
+{
+	*printstr(dst, edst, src, 0) = 0;
+	return dst;
+}

print.h

@@ -0,0 +1,11 @@
+#include <stdarg.h>
+
+char* vseprint(char *dst, char *edst, char *fmt, va_list arg);
+char* vsnprint(char *dst, unsigned int n, char *fmt, va_list arg);
+char* snprint(char *dst, unsigned int n, char *fmt, ...);
+char* seprint(char* dst, char* edst, char* fmt, ...);
+int vfprint(int fd, char *fmt, va_list arg);
+int vprint(char *fmt, va_list arg);
+int fprint(int fd, char *fmt, ...);
+int print(char *fmt, ...);
+char* strecpy(char *dst, char *edst, char *src);

save.c

@@ -0,0 +1,163 @@
+#include "gb.h"
+#include <stdio.h>
+
+extern Var cpuvars[], ppuvars[], memvars[], evvars[];
+static FILE *fp;
+
+void
+putevents(void)
+{
+	u8 i, j;
+	Event *e;
+
+	for(i = 0; i < NEVENT; ++i)
+		if(elist == events[i]) /* find head */
+			break;
+	if(i == NEVENT && elist != nil)
+		error("Unkown event in chain [%p]", elist);
+	fputc(i, fp);
+	for(i = 0; i < NEVENT; ++i){
+		e = events[i];
+		fputc(e->time & 0x000000ff, fp);
+		fputc(e->time & 0x0000ff00, fp);
+		fputc(e->time & 0x00ff0000, fp);
+		fputc(e->time & 0xff000000, fp);
+		for(j = 0; j < NEVENT; ++j)
+			if(e->next == events[j]) /* find next */
+				break;
+		if(j == NEVENT && e->next != nil)
+			error("Unkown event in chain [%p]", e->next);
+		fputc(j, fp);
+	}
+}
+
+void
+putvars(Var *v)
+{
+	int n;
+	u16 *p;
+	u32 *q;
+
+	for(; v->a != nil; v++){
+		switch(v->s){
+		case 1:
+			fwrite(v->a, 1, v->n, fp);
+			break;
+		case 2:
+			n = v->n;
+			p = v->a;
+			while(n--){
+				fputc(*p & 0xff, fp);
+				fputc(*p++ >> 8, fp);
+			}
+			break;
+		case 4:
+			n = v->n;
+			q = v->a;
+			while(n--){
+				fputc(*q, fp);
+				fputc(*q >> 8, fp);
+				fputc(*q >> 16, fp);
+				fputc(*q >> 24, fp);
+			}
+			break;
+		}
+	}
+}
+
+void
+getvars(Var *v)
+{
+	int n;
+	u16 *p, w;
+	u32 *q, l;
+
+	for(; v->a != nil; v++){
+		switch(v->s){
+		case 1: fread(v->a, v->n, 1, fp); break;
+		case 2:
+			n = v->n;
+			p = v->a;
+			while(n--){
+				w = fgetc(fp);
+				w |= fgetc(fp) << 8;
+				*p++ = w;
+			}
+			break;
+		case 4:
+			n = v->n;
+			q = v->a;
+			while(n--){
+				l  = fgetc(fp);
+				l |= fgetc(fp) << 8;
+				l |= fgetc(fp) << 16;
+				l |= fgetc(fp) << 24;
+				*q++ = l;
+			}
+			break;
+		}
+	}
+}
+
+int
+savestate(const char *fname)
+{
+	fp = fopen(fname, "w");
+	if(fp == 0){
+		error("Can't open '%s'", fname);
+		return -1;
+	}
+	putvars(cpuvars);
+	putvars(ppuvars);
+	putvars(memvars);
+	putvars(evvars);
+	putevents();
+	mapper(SAVE, 0);
+	fclose(fp);
+	fp = 0;
+	return 0;
+}
+
+static void
+getevents(void)
+{
+	int i, j;
+	Event *e;
+
+	i = fgetc(fp);
+	if(i >= NEVENT)
+		elist = nil;
+	else
+		elist = events[i];
+	for(i = 0; i < NEVENT; ++i){
+		e = events[i];
+		e->time = fgetc(fp);
+		e->time |= fgetc(fp) << 8;
+		e->time |= fgetc(fp) << 16;
+		e->time |= fgetc(fp) << 24;
+		j = fgetc(fp);
+		if(j >= NEVENT)
+			e->next = nil;
+		else
+			e->next = events[j];
+	}
+}
+
+int
+loadstate(const char *fname)
+{
+	fp = fopen(fname, "r");
+	if(fp == 0){
+		error("Can't load '%s'", fname);
+		return -1;
+	}
+	getvars(cpuvars);
+	getvars(ppuvars);
+	getvars(memvars);
+	getvars(evvars);
+	getevents();
+	mapper(RSTR, 0);
+	fclose(fp);
+	fp = 0;
+	return 0;
+}