Added new Z80 core

1 files changed, 366 insertions, 0 deletions

diff --git a/src/z80.c b/src/z80.c
new file mode 100644
index 0000000..60dbca4
--- /dev/null
+++ b/src/z80.c
@@ -0,0 +1,366 @@
+/*
+
+    z80 - Z80 Emulator
+
+    Copyright (C) 2006  Ian Cowburn <ianc@noddybox.co.uk>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    -------------------------------------------------------------------------
+
+    $Id$
+
+    Z80
+
+*/
+#include <stdlib.h>
+#include <string.h>
+
+#include "z80.h"
+#include "z80_private.h"
+
+static const char ident[]="$Id$";
+static const char ident_z80_header[]=Z80_H;
+static const char ident_z80_private_header[]=Z80_PRIVATE_H;
+
+Z80Label        *z80_labels=NULL;
+
+/* ---------------------------------------- PRIVATE FUNCTIONS
+*/
+static void InitTables()
+{
+    static int init=FALSE;
+
+    if (init)
+    	return;
+
+    init=TRUE;
+
+    Z80_InitialiseInternals();
+}
+
+static void Z80_CheckInterrupt(Z80 *cpu)
+{
+    /* Check interrupts
+    */
+    if (cpu->raise)
+    {
+    	if (cpu->nmi)
+	{
+	    if (cpu->halt)
+	    {
+		cpu->halt=FALSE;
+		CALLBACK(eZ80_Halt,0);
+		cpu->PC++;
+	    }
+
+	    TSTATE(2);
+	    cpu->IFF1=0;
+	    cpu->nmi=FALSE;
+	    PUSH(cpu->PC);
+	    cpu->PC=0x66;
+	}
+    	else if (cpu->IFF1)
+	{
+	    if (cpu->halt)
+	    {
+		cpu->halt=FALSE;
+		CALLBACK(eZ80_Halt,0);
+		cpu->PC++;
+	    }
+
+	    TSTATE(2);
+
+	    switch(cpu->IM)
+	    {
+		default:
+		case 0:
+		    INC_R;
+		    Z80_Decode(cpu,cpu->devbyte);
+		    return;
+		    break;
+
+		case 1:
+		    PUSH(cpu->PC);
+		    cpu->PC=0x38;
+		    break;
+
+		case 2:
+		    PUSH(cpu->PC);
+		    cpu->PC=(Z80Word)cpu->I*256+cpu->devbyte;
+		    break;
+	    }
+	}
+
+	cpu->raise=FALSE;
+    }
+}
+
+
+/* ---------------------------------------- INTERFACES
+*/
+
+Z80	*Z80Init(Z80ReadMemory read_memory,
+		 Z80WriteMemory write_memory,
+		 Z80ReadPort read_port,
+		 Z80WritePort write_port,
+		 Z80ReadMemory read_disassem)
+{
+    Z80 *cpu;
+    int f;
+    int r;
+
+    InitTables();
+
+    if (!read_memory || !write_memory)
+    	return NULL;
+
+    cpu=malloc(sizeof *cpu);
+
+    if (cpu)
+    {
+	cpu->mread=read_memory;
+	cpu->mwrite=write_memory;
+	cpu->pread=read_port;
+	cpu->pwrite=write_port;
+	cpu->disread=read_disassem;
+
+	for(f=0;f<eZ80_NO_CALLBACK;f++)
+	    for(r=0;r<MAX_PER_CALLBACK;r++)
+		cpu->callback[f][r]=NULL;
+
+	Z80Reset(cpu);
+    }
+
+    return cpu;
+}
+
+
+void Z80Reset(Z80 *cpu)
+{
+    cpu->cycle=0;
+    cpu->PC=0;
+
+    cpu->AF.w=0xffff;
+    cpu->BC.w=0xffff;
+    cpu->DE.w=0xffff;
+    cpu->HL.w=0xffff;
+    cpu->AF_=0xffff;
+    cpu->BC_=0xffff;
+    cpu->DE_=0xffff;
+    cpu->HL_=0xffff;
+
+    cpu->IX.w=0xffff;
+    cpu->IY.w=0xffff;
+
+    cpu->SP=0xffff;
+    cpu->IFF1=0;
+    cpu->IFF2=0;
+    cpu->IM=0;
+    cpu->I=0;
+    cpu->R=0;
+    cpu->halt=0;
+
+    cpu->raise=FALSE;
+    cpu->nmi=FALSE;
+}
+
+
+void Z80SetPC(Z80 *cpu,Z80Word PC)
+{
+    cpu->PC=PC;
+}
+
+
+Z80Word Z80GetPC(Z80 *cpu)
+{
+    return cpu->PC;
+}
+
+
+void Z80ResetCycles(Z80 *cpu, Z80Val cycles)
+{
+    cpu->cycle=cycles;
+}
+
+
+int Z80LodgeCallback(Z80 *cpu, Z80CallbackReason reason, Z80Callback callback)
+{
+    int f;
+
+    for(f=0;f<MAX_PER_CALLBACK;f++)
+    {
+    	if (!cpu->callback[reason][f])
+	{
+	    cpu->callback[reason][f]=callback;
+	    return TRUE;
+	}
+    }
+
+    return FALSE;
+}
+
+
+void Z80RemoveCallback(Z80 *cpu, Z80CallbackReason reason, Z80Callback callback)
+{
+    int f;
+
+    for(f=0;f<MAX_PER_CALLBACK;f++)
+    	if (cpu->callback[reason][f]==callback)
+	    cpu->callback[reason][f]=NULL;
+}
+
+
+void Z80Interrupt(Z80 *cpu, Z80Byte devbyte)
+{
+    cpu->raise=TRUE;
+    cpu->devbyte=devbyte;
+    cpu->nmi=FALSE;
+}
+
+
+void Z80NMI(Z80 *cpu)
+{
+    cpu->raise=TRUE;
+    cpu->nmi=TRUE;
+}
+
+
+int Z80SingleStep(Z80 *cpu)
+{
+    Z80Byte opcode;
+
+    cpu->last_cb=TRUE;
+    cpu->shift=0;
+
+    Z80_CheckInterrupt(cpu);
+
+    CALLBACK(eZ80_Instruction,cpu->cycle);
+
+    INC_R;
+
+    opcode=FETCH_BYTE;
+
+    Z80_Decode(cpu,opcode);
+
+    return cpu->last_cb;
+}
+
+
+void Z80Exec(Z80 *cpu)
+{
+    while (Z80SingleStep(cpu));
+}
+
+
+void Z80GetState(Z80 *cpu, Z80State *state)
+{
+    state->cycle=	cpu->cycle;
+
+    state->AF	=	cpu->AF.w;
+    state->BC	=	cpu->BC.w;
+    state->DE	=	cpu->DE.w;
+    state->HL	=	cpu->HL.w;
+
+    state->AF_	=	cpu->AF_;
+    state->BC_	=	cpu->BC_;
+    state->DE_	=	cpu->DE_;
+    state->HL_	=	cpu->HL_;
+
+    state->IX	=	cpu->IX.w;
+    state->IY	=	cpu->IY.w;
+
+    state->SP	=	cpu->SP;
+    state->PC	=	cpu->PC;
+
+    state->IFF1	=	cpu->IFF1;
+    state->IFF2	=	cpu->IFF2;
+    state->IM	=	cpu->IM;
+    state->I	=	cpu->I;
+    state->R	=	cpu->R;
+}
+
+
+void Z80SetState(Z80 *cpu, const Z80State *state)
+{
+    cpu->cycle	=	state->cycle;
+
+    cpu->AF.w	=	state->AF;
+    cpu->BC.w	=	state->BC;
+    cpu->DE.w	=	state->DE;
+    cpu->HL.w	=	state->HL;
+
+    cpu->AF_	=	state->AF_;
+    cpu->BC_	=	state->BC_;
+    cpu->DE_	=	state->DE_;
+    cpu->HL_	=	state->HL_;
+
+    cpu->IX.w	=	state->IX;
+    cpu->IY.w	=	state->IY;
+
+    cpu->SP	=	state->SP;
+    cpu->PC	=	state->PC;
+
+    cpu->IFF1	=	state->IFF1;
+    cpu->IFF2	=	state->IFF2;
+    cpu->IM	=	state->IM;
+    cpu->I	=	state->I;
+    cpu->R	=	state->R;
+}
+
+
+Z80Val Z80Cycles(Z80 *cpu)
+{
+    return cpu->cycle;
+}
+
+
+void Z80SetLabels(Z80Label labels[])
+{
+    z80_labels=labels;
+}
+
+
+const char *Z80Disassemble(Z80 *cpu, Z80Word *pc)
+{
+#ifdef ENABLE_DISASSEM
+    static char s[80];
+    Z80Word opc,npc;
+    Z80Byte op;
+    int f;
+
+    opc=*pc;
+    op=Z80_Dis_FetchByte(cpu,pc);
+    dis_opcode_z80[op](cpu,op,pc);
+    npc=*pc;
+
+    strcpy(s,Z80_Dis_Printf("%-5s",Z80_Dis_GetOp()));
+    strcat(s,Z80_Dis_Printf("%-40s ;",Z80_Dis_GetArg()));
+
+    for(f=0;f<5 && opc!=npc;f++)
+	strcat(s,Z80_Dis_Printf(" %.2x",(int)cpu->disread(cpu,opc++)));
+
+    if (opc!=npc)
+	for(f=1;f<3;f++)
+	    s[strlen(s)-f]='.';
+
+    return s;
+#else
+    (*pc)+=4;
+    return "NO DISASSEMBLER";
+#endif
+}
+
+/* END OF FILE */