X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2FMemory.c;h=2b253d80e0322f141587eb77ea0458daae995c2c;hb=a4f0cc8647c019f149541df380a2d30e14aeb75c;hp=c9c9a020cc0f9a000f930bc9d56934b13478f3a0;hpb=fa1e5e2948e9b06dec3353081081173f7ae4d742;p=picodrive.git

diff --git a/Pico/Memory.c b/Pico/Memory.c
index c9c9a02..2b253d8 100644
--- a/Pico/Memory.c
+++ b/Pico/Memory.c
@@ -7,7 +7,7 @@
 // For commercial use, separate licencing terms must be obtained.
 
 
-//#define __debug_io
+#define __debug_io
 
 #include "PicoInt.h"
 
@@ -22,8 +22,8 @@ typedef unsigned int   u32;
 extern unsigned int lastSSRamWrite; // used by serial SRAM code
 
 #ifdef _ASM_MEMORY_C
-u8   PicoRead8(u32 a);
-u16  PicoRead16(u32 a);
+u32  PicoRead8(u32 a);
+u32  PicoRead16(u32 a);
 void PicoWriteRomHW_SSF2(u32 a,u32 d);
 void PicoWriteRomHW_in1 (u32 a,u32 d);
 #endif
@@ -69,9 +69,13 @@ static u32 CPU_CALL PicoCheckPc(u32 pc)
   u32 ret=0;
 #if defined(EMU_C68K)
   pc-=PicoCpu.membase; // Get real pc
-  pc&=0xfffffe;
+//  pc&=0xfffffe;
+  pc&=~1;
+  if ((pc<<8) == 0)
+    return (int)Pico.rom + Pico.romsize; // common crash condition, can happen if acc timing is off
 
-  PicoCpu.membase=PicoMemBase(pc);
+  PicoCpu.membase=PicoMemBase(pc&0x00ffffff);
+  PicoCpu.membase-=pc&0xff000000;
 
   ret = PicoCpu.membase+pc;
 #elif defined(EMU_A68K)
@@ -192,6 +196,7 @@ static void OtherWrite8End(u32 a,u32 d,int realsize)
   //if(a==0x200000) dprintf("cc : %02x @ %06x [%i|%i]", d, SekPc, SekCyclesDoneT(), SekCyclesDone());
   //if(a==0x200001) dprintf("w8 : %02x @ %06x [%i]", d, SekPc, SekCyclesDoneT());
   if(a >= SRam.start && a <= SRam.end) {
+    dprintf("sram w%i: %06x, %08x @%06x", realsize, a&0xffffff, d, SekPc);
     unsigned int sreg = Pico.m.sram_reg;
     if(!(sreg & 0x10)) {
       // not detected SRAM
@@ -229,7 +234,9 @@ static void OtherWrite8End(u32 a,u32 d,int realsize)
 #else
   // sram access register
   if(a == 0xA130F1) {
-    Pico.m.sram_reg = (u8)(d&3);
+    dprintf("sram reg=%02x", d);
+    Pico.m.sram_reg &= ~3;
+    Pico.m.sram_reg |= (u8)(d&3);
     return;
   }
 #endif
@@ -259,7 +266,7 @@ static void OtherWrite8End(u32 a,u32 d,int realsize)
 //                     Read Rom and read Ram
 
 #ifndef _ASM_MEMORY_C
-u8 CPU_CALL PicoRead8(u32 a)
+u32 CPU_CALL PicoRead8(u32 a)
 {
   u32 d=0;
 
@@ -302,17 +309,17 @@ u8 CPU_CALL PicoRead8(u32 a)
   dprintf("r8 : %06x,   %02x @%06x", a&0xffffff, (u8)d, SekPc);
 #endif
 #if defined(EMU_C68K) && defined(EMU_M68K)
-  if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
+  if(a>=Pico.romsize/*&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b*/) {
     lastread_a = a;
     lastread_d[lrp_cyc++&15] = (u8)d;
   }
 #endif
-  return (u8)d;
+  return d;
 }
 
-u16 CPU_CALL PicoRead16(u32 a)
+u32 CPU_CALL PicoRead16(u32 a)
 {
-  u16 d=0;
+  u32 d=0;
 
   if ((a&0xe00000)==0xe00000) { d=*(u16 *)(Pico.ram+(a&0xfffe)); goto end; } // Ram
 
@@ -321,14 +328,14 @@ u16 CPU_CALL PicoRead16(u32 a)
 #if !(defined(EMU_C68K) && defined(EMU_M68K))
   // sram
   if(a >= SRam.start && a <= SRam.end && (Pico.m.sram_reg & 1)) {
-    d = (u16) SRAMRead(a);
+    d = SRAMRead(a);
     goto end;
   }
 #endif
 
   if (a<Pico.romsize) { d = *(u16 *)(Pico.rom+a); goto end; } // Rom
 
-  d = (u16)OtherRead16(a, 16);
+  d = OtherRead16(a, 16);
 
   end:
   //if ((a&0xe0ffff)==0xe0AF0E+0x69c||(a&0xe0ffff)==0xe0A9A8+0x69c||(a&0xe0ffff)==0xe0A9AA+0x69c||(a&0xe0ffff)==0xe0A9AC+0x69c)
@@ -338,7 +345,7 @@ u16 CPU_CALL PicoRead16(u32 a)
   dprintf("r16: %06x, %04x  @%06x", a&0xffffff, d, SekPc);
 #endif
 #if defined(EMU_C68K) && defined(EMU_M68K)
-  if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
+  if(a>=Pico.romsize/*&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b*/) {
     lastread_a = a;
     lastread_d[lrp_cyc++&15] = d;
   }
@@ -369,7 +376,7 @@ u32 CPU_CALL PicoRead32(u32 a)
   dprintf("r32: %06x, %08x @%06x", a&0xffffff, d, SekPc);
 #endif
 #if defined(EMU_C68K) && defined(EMU_M68K)
-  if(a>=Pico.romsize&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b) {
+  if(a>=Pico.romsize/*&&(ppop&0x3f)!=0x3a&&(ppop&0x3f)!=0x3b*/) {
     lastread_a = a;
     lastread_d[lrp_cyc++&15] = d;
   }
@@ -392,16 +399,13 @@ static void CPU_CALL PicoWrite8(u32 a,u8 d)
   //if ((a&0xe0ffff)==0xe0a9ba+0x69c)
   //  dprintf("w8 : %06x,   %02x @%06x", a&0xffffff, d, SekPc);
 
-
-  if ((a&0xe00000)==0xe00000) {
-	  if((a&0xffff)==0xf62a) dprintf("(f62a) = %02x [%i|%i] @ %x", d, Pico.m.scanline, SekCyclesDone(), SekPc);
-	   u8 *pm=(u8 *)(Pico.ram+((a^1)&0xffff)); pm[0]=d; return; } // Ram
+  if ((a&0xe00000)==0xe00000) { *(u8 *)(Pico.ram+((a^1)&0xffff))=d; return; } // Ram
 
   a&=0xffffff;
   OtherWrite8(a,d,8);
 }
 
-static void CPU_CALL PicoWrite16(u32 a,u16 d)
+void CPU_CALL PicoWrite16(u32 a,u16 d)
 {
 #ifdef __debug_io
   dprintf("w16: %06x, %04x", a&0xffffff, d);
@@ -498,39 +502,78 @@ unsigned int  m68k_read_pcrelative_CD16(unsigned int a);
 unsigned int  m68k_read_pcrelative_CD32(unsigned int a);
 
 // these are allowed to access RAM
-unsigned int  m68k_read_pcrelative_8 (unsigned int a) {
+static unsigned int  m68k_read_8 (unsigned int a, int do_fake) {
   a&=0xffffff;
   if(PicoMCD&1) return m68k_read_pcrelative_CD8(a);
   if(a<Pico.romsize)         return *(u8 *)(Pico.rom+(a^1)); // Rom
+#ifdef EMU_C68K
+  if(do_fake&&((ppop&0x3f)==0x3a||(ppop&0x3f)==0x3b)) return lastread_d[lrp_mus++&15];
+#endif
   if((a&0xe00000)==0xe00000) return *(u8 *)(Pico.ram+((a^1)&0xffff)); // Ram
-  return 0;//(u8)  lastread_d;
+  return 0;
 }
-unsigned int  m68k_read_pcrelative_16(unsigned int a) {
+static unsigned int  m68k_read_16(unsigned int a, int do_fake) {
   a&=0xffffff;
   if(PicoMCD&1) return m68k_read_pcrelative_CD16(a);
   if(a<Pico.romsize)         return *(u16 *)(Pico.rom+(a&~1)); // Rom
+#ifdef EMU_C68K
+  if(do_fake&&((ppop&0x3f)==0x3a||(ppop&0x3f)==0x3b)) return lastread_d[lrp_mus++&15];
+#endif
   if((a&0xe00000)==0xe00000) return *(u16 *)(Pico.ram+(a&0xfffe)); // Ram
-  return 0;//(u16) lastread_d;
+  return 0;
 }
-unsigned int  m68k_read_pcrelative_32(unsigned int a) {
+static unsigned int  m68k_read_32(unsigned int a, int do_fake) {
   a&=0xffffff;
   if(PicoMCD&1) return m68k_read_pcrelative_CD32(a);
   if(a<Pico.romsize)         { u16 *pm=(u16 *)(Pico.rom+(a&~1));     return (pm[0]<<16)|pm[1]; }
+#ifdef EMU_C68K
+  if(do_fake&&((ppop&0x3f)==0x3a||(ppop&0x3f)==0x3b)) return lastread_d[lrp_mus++&15];
+#endif
   if((a&0xe00000)==0xe00000) { u16 *pm=(u16 *)(Pico.ram+(a&0xfffe)); return (pm[0]<<16)|pm[1]; } // Ram
-  return 0;//lastread_d;
+  return 0;
 }
 
-unsigned int m68k_read_immediate_16(unsigned int a)    { return m68k_read_pcrelative_16(a); }
-unsigned int m68k_read_immediate_32(unsigned int a)    { return m68k_read_pcrelative_32(a); }
-unsigned int m68k_read_disassembler_8 (unsigned int a) { return m68k_read_pcrelative_8 (a); }
-unsigned int m68k_read_disassembler_16(unsigned int a) { return m68k_read_pcrelative_16(a); }
-unsigned int m68k_read_disassembler_32(unsigned int a) { return m68k_read_pcrelative_32(a); }
+unsigned int m68k_read_pcrelative_8 (unsigned int a)   { return m68k_read_8 (a, 1); }
+unsigned int m68k_read_pcrelative_16(unsigned int a)   { return m68k_read_16(a, 1); }
+unsigned int m68k_read_pcrelative_32(unsigned int a)   { return m68k_read_32(a, 1); }
+unsigned int m68k_read_immediate_16(unsigned int a)    { return m68k_read_16(a, 0); }
+unsigned int m68k_read_immediate_32(unsigned int a)    { return m68k_read_32(a, 0); }
+unsigned int m68k_read_disassembler_8 (unsigned int a) { return m68k_read_8 (a, 0); }
+unsigned int m68k_read_disassembler_16(unsigned int a) { return m68k_read_16(a, 0); }
+unsigned int m68k_read_disassembler_32(unsigned int a) { return m68k_read_32(a, 0); }
 
 #ifdef EMU_C68K
 // ROM only
-unsigned int  m68k_read_memory_8(unsigned int a)  { if(a<Pico.romsize) return  *(u8 *) (Pico.rom+(a^1)); return (u8)  lastread_d[lrp_mus++&15]; }
-unsigned int  m68k_read_memory_16(unsigned int a) { if(a<Pico.romsize) return  *(u16 *)(Pico.rom+(a&~1));return (u16) lastread_d[lrp_mus++&15]; }
-unsigned int  m68k_read_memory_32(unsigned int a) { if(a<Pico.romsize) {u16 *pm=(u16 *)(Pico.rom+(a&~1));return (pm[0]<<16)|pm[1];} return lastread_d[lrp_mus++&15]; }
+unsigned int m68k_read_memory_8(unsigned int a)
+{
+  u8 d;
+  if(a<Pico.romsize) d = *(u8 *) (Pico.rom+(a^1));
+  else d = (u8) lastread_d[lrp_mus++&15];
+#ifdef __debug_io
+  dprintf("r8_mu : %06x,   %02x @%06x", a&0xffffff, d, SekPc);
+#endif
+  return d;
+}
+unsigned int m68k_read_memory_16(unsigned int a)
+{
+  u16 d;
+  if(a<Pico.romsize) d = *(u16 *)(Pico.rom+(a&~1));
+  else d = (u16) lastread_d[lrp_mus++&15];
+#ifdef __debug_io
+  dprintf("r16_mu: %06x, %04x @%06x", a&0xffffff, d, SekPc);
+#endif
+  return d;
+}
+unsigned int m68k_read_memory_32(unsigned int a)
+{
+  u32 d;
+  if(a<Pico.romsize) {u16 *pm=(u16 *)(Pico.rom+(a&~1));d=(pm[0]<<16)|pm[1];}
+  else d = lastread_d[lrp_mus++&15];
+#ifdef __debug_io
+  dprintf("r32_mu: %06x, %08x @%06x", a&0xffffff, d, SekPc);
+#endif
+  return d;
+}
 
 // ignore writes, Cyclone already done that
 void m68k_write_memory_8(unsigned int address, unsigned int value)  { lastwrite_mus_d[lwp_mus++&15] = value; }