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Area.c
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Area.c
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// This is part of Pico Library
// (c) Copyright 2004 Dave, All rights reserved.
// (c) Copyright 2006 notaz, All rights reserved.
// Free for non-commercial use.
// For commercial use, separate licencing terms must be obtained.
#include "PicoInt.h"
// sn76496
/*extern int *sn76496_regs;*/
struct PicoArea { void *data; int len; char *name; };
// strange observation on Symbian OS 9.1, m600 organizer fw r3a06:
// taking an address of fread or fwrite causes "application could't be started" error
// on startup randomly depending on binary layout of executable file.
arearw *areaRead = (arearw *) 0; // fread; // read and write function pointers for
arearw *areaWrite = (arearw *) 0; // fwrite; // gzip save state ability
areaeof *areaEof = (areaeof *) 0;
areaseek *areaSeek = (areaseek *) 0;
areaclose *areaClose = (areaclose *) 0;
// Scan one variable and callback
static int ScanVar(void *data,int len,char *name,void *PmovFile,int PmovAction)
{
int ret = 0;
if ((PmovAction&3)==1) ret = areaWrite(data,1,len,PmovFile);
if ((PmovAction&3)==2) ret = areaRead (data,1,len,PmovFile);
return (ret != len);
}
#define SCAN_VAR(x,y) ScanVar(&x,sizeof(x),y,PmovFile,PmovAction);
#define SCANP(x) ScanVar(&Pico.x,sizeof(Pico.x),#x,PmovFile,PmovAction);
// Pack the cpu into a common format:
PICO_INTERNAL int PicoAreaPackCpu(unsigned char *cpu, int is_sub)
{
unsigned int pc=0;
#if defined(EMU_C68K)
struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
memcpy(cpu,context->d,0x40);
pc=context->pc-context->membase;
*(unsigned int *)(cpu+0x44)=CycloneGetSr(context);
*(unsigned int *)(cpu+0x48)=context->osp;
cpu[0x4c] = context->irq;
cpu[0x4d] = context->state_flags & 1;
#elif defined(EMU_M68K)
void *oldcontext = m68ki_cpu_p;
m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
memcpy(cpu,m68ki_cpu_p->dar,0x40);
pc=m68ki_cpu_p->pc;
*(unsigned int *)(cpu+0x44)=m68k_get_reg(NULL, M68K_REG_SR);
*(unsigned int *)(cpu+0x48)=m68ki_cpu_p->sp[0];
cpu[0x4c] = CPU_INT_LEVEL>>8;
cpu[0x4d] = CPU_STOPPED;
m68k_set_context(oldcontext);
#elif defined(EMU_F68K)
M68K_CONTEXT *context = is_sub ? 0 : &PicoCpuFM68k;
memcpy(cpu,context->dreg,0x40);
pc=context->pc;
*(unsigned int *)(cpu+0x44)=context->sr;
*(unsigned int *)(cpu+0x48)=context->asp;
cpu[0x4c] = context->interrupts[0];
cpu[0x4d] = (context->execinfo & FM68K_HALTED) ? 1 : 0;
#endif
*(unsigned int *)(cpu+0x40)=pc;
return 0;
}
PICO_INTERNAL int PicoAreaUnpackCpu(unsigned char *cpu, int is_sub)
{
#if defined(EMU_C68K)
struct Cyclone *context = is_sub ? &PicoCpuCS68k : &PicoCpuCM68k;
CycloneSetSr(context, *(unsigned int *)(cpu+0x44));
context->osp=*(unsigned int *)(cpu+0x48);
memcpy(context->d,cpu,0x40);
context->membase=0;
context->pc = context->checkpc(*(unsigned int *)(cpu+0x40)); // Base pc
context->irq = cpu[0x4c];
context->state_flags = 0;
if (cpu[0x4d])
context->state_flags |= 1;
#elif defined(EMU_M68K)
void *oldcontext = m68ki_cpu_p;
m68k_set_context(is_sub ? &PicoCpuMS68k : &PicoCpuMM68k);
memcpy(m68ki_cpu_p->dar,cpu,0x40);
m68ki_cpu_p->pc=*(unsigned int *)(cpu+0x40);
m68k_set_reg(M68K_REG_SR, *(unsigned int *)(cpu+0x44));
m68ki_cpu_p->sp[0]=*(unsigned int *)(cpu+0x48);
CPU_INT_LEVEL = cpu[0x4c] << 8;
CPU_STOPPED = cpu[0x4d];
m68k_set_context(oldcontext);
#elif defined(EMU_F68K)
M68K_CONTEXT *context = is_sub ? 0 : &PicoCpuFM68k;
memcpy(context->dreg,cpu,0x40);
context->pc =*(unsigned int *)(cpu+0x40);
context->sr =*(unsigned int *)(cpu+0x44);
context->asp=*(unsigned int *)(cpu+0x48);
context->interrupts[0] = cpu[0x4c];
context->execinfo &= ~FM68K_HALTED;
if (cpu[0x4d]&1) context->execinfo |= FM68K_HALTED;
#endif
return 0;
}
// Scan the contents of the virtual machine's memory for saving or loading
static int PicoAreaScan(int PmovAction,unsigned int ver, void *PmovFile)
{
unsigned char cpu[0x60];
unsigned char cpu_z80[0x60];
int ret;
memset(&cpu,0,sizeof(cpu));
memset(&cpu_z80,0,sizeof(cpu_z80));
if (PmovAction&4)
{
Pico.m.scanline=0;
// Scan all the memory areas:
SCANP(ram) SCANP(vram) SCANP(zram) SCANP(cram) SCANP(vsram)
// Pack, scan and unpack the cpu data:
if((PmovAction&3)==1) PicoAreaPackCpu(cpu, 0);
//SekInit(); // notaz: do we really have to do this here?
//PicoMemInit();
SCAN_VAR(cpu,"cpu")
if((PmovAction&3)==2) PicoAreaUnpackCpu(cpu, 0);
SCAN_VAR(Pico.m ,"misc")
SCAN_VAR(Pico.video,"video")
// notaz: save/load z80, YM2612, sn76496 states instead of Pico.s (which is unused anyway)
if(PicoOpt&7) {
ret = SCAN_VAR(cpu_z80,"cpu_z80")
// do not unpack if we fail to load z80 state
if((PmovAction&3)==2) {
/* else z80_unpack(cpu_z80);*/
}
}
/* if(PicoOpt&3)
ScanVar(sn76496_regs,28*4,"SN76496state", PmovFile, PmovAction);*/ // regs and other stuff
}
return 0;
}
// ---------------------------------------------------------------------------
// Helper code to save/load to a file handle
// Save or load the state from PmovFile:
int PmovState(int PmovAction, void *PmovFile)
{
int minimum=0;
unsigned char head[32];
/*if (PicoMCD & 1)
{
if (PmovAction&1) return PicoCdSaveState(PmovFile);
if (PmovAction&2) return PicoCdLoadState(PmovFile);
}*/
memset(head,0,sizeof(head));
// Find out minimal compatible version:
//PicoAreaScan(PmovAction&0xc,&minimum);
minimum = 0x0021;
memcpy(head,"Pico",4);
*(unsigned int *)(head+0x8)=PicoVer;
*(unsigned int *)(head+0xc)=minimum;
// Scan header:
if (PmovAction&1) areaWrite(head,1,sizeof(head),PmovFile);
if (PmovAction&2) areaRead (head,1,sizeof(head),PmovFile);
// Scan memory areas:
PicoAreaScan(PmovAction, *(unsigned int *)(head+0x8), PmovFile);
return 0;
}