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sim7.c
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/*
* Z80SIM - a Z80-CPU simulator
*
* Copyright (C) 1987-2007 by Udo Munk
*
* History:
* 28-SEP-87 Development on TARGON/35 with AT&T Unix System V.3
* 11-JAN-89 Release 1.1
* 08-FEB-89 Release 1.2
* 13-MAR-89 Release 1.3
* 09-FEB-90 Release 1.4 Ported to TARGON/31 M10/30
* 20-DEC-90 Release 1.5 Ported to COHERENT 3.0
* 10-JUN-92 Release 1.6 long casting problem solved with COHERENT 3.2
* and some optimization
* 25-JUN-92 Release 1.7 comments in english and ported to COHERENT 4.0
* 02-OCT-06 Release 1.8 modified to compile on modern POSIX OS's
* 18-NOV-06 Release 1.9 modified to work with CP/M sources
* 08-DEC-06 Release 1.10 modified MMU for working with CP/NET
* 17-DEC-06 Release 1.11 TCP/IP sockets for CP/NET
* 25-DEC-06 Release 1.12 CPU speed option
* 19-FEB-07 Release 1.13 various improvements
*/
/*
* Like the function "cpu()" this one emulates 4 byte opcodes
* starting with 0xfd 0xcb
*/
#include "sim.h"
#include "simglb.h"
static int trap_fdcb(void);
static int op_tb0iyd(int), op_tb1iyd(int), op_tb2iyd(int), op_tb3iyd(int);
static int op_tb4iyd(int), op_tb5iyd(int), op_tb6iyd(int), op_tb7iyd(int);
static int op_rb0iyd(int), op_rb1iyd(int), op_rb2iyd(int), op_rb3iyd(int);
static int op_rb4iyd(int), op_rb5iyd(int), op_rb6iyd(int), op_rb7iyd(int);
static int op_sb0iyd(int), op_sb1iyd(int), op_sb2iyd(int), op_sb3iyd(int);
static int op_sb4iyd(int), op_sb5iyd(int), op_sb6iyd(int), op_sb7iyd(int);
static int op_rlciyd(int), op_rrciyd(int), op_rliyd(int), op_rriyd(int);
static int op_slaiyd(int), op_sraiyd(int), op_srliyd(int);
int op_fdcb_handel(void)
{
static int (*op_fdcb[256]) () = {
trap_fdcb, /* 0x00 */
trap_fdcb, /* 0x01 */
trap_fdcb, /* 0x02 */
trap_fdcb, /* 0x03 */
trap_fdcb, /* 0x04 */
trap_fdcb, /* 0x05 */
op_rlciyd, /* 0x06 */
trap_fdcb, /* 0x07 */
trap_fdcb, /* 0x08 */
trap_fdcb, /* 0x09 */
trap_fdcb, /* 0x0a */
trap_fdcb, /* 0x0b */
trap_fdcb, /* 0x0c */
trap_fdcb, /* 0x0d */
op_rrciyd, /* 0x0e */
trap_fdcb, /* 0x0f */
trap_fdcb, /* 0x10 */
trap_fdcb, /* 0x11 */
trap_fdcb, /* 0x12 */
trap_fdcb, /* 0x13 */
trap_fdcb, /* 0x14 */
trap_fdcb, /* 0x15 */
op_rliyd, /* 0x16 */
trap_fdcb, /* 0x17 */
trap_fdcb, /* 0x18 */
trap_fdcb, /* 0x19 */
trap_fdcb, /* 0x1a */
trap_fdcb, /* 0x1b */
trap_fdcb, /* 0x1c */
trap_fdcb, /* 0x1d */
op_rriyd, /* 0x1e */
trap_fdcb, /* 0x1f */
trap_fdcb, /* 0x20 */
trap_fdcb, /* 0x21 */
trap_fdcb, /* 0x22 */
trap_fdcb, /* 0x23 */
trap_fdcb, /* 0x24 */
trap_fdcb, /* 0x25 */
op_slaiyd, /* 0x26 */
trap_fdcb, /* 0x27 */
trap_fdcb, /* 0x28 */
trap_fdcb, /* 0x29 */
trap_fdcb, /* 0x2a */
trap_fdcb, /* 0x2b */
trap_fdcb, /* 0x2c */
trap_fdcb, /* 0x2d */
op_sraiyd, /* 0x2e */
trap_fdcb, /* 0x2f */
trap_fdcb, /* 0x30 */
trap_fdcb, /* 0x31 */
trap_fdcb, /* 0x32 */
trap_fdcb, /* 0x33 */
trap_fdcb, /* 0x34 */
trap_fdcb, /* 0x35 */
trap_fdcb, /* 0x36 */
trap_fdcb, /* 0x37 */
trap_fdcb, /* 0x38 */
trap_fdcb, /* 0x39 */
trap_fdcb, /* 0x3a */
trap_fdcb, /* 0x3b */
trap_fdcb, /* 0x3c */
trap_fdcb, /* 0x3d */
op_srliyd, /* 0x3e */
trap_fdcb, /* 0x3f */
trap_fdcb, /* 0x40 */
trap_fdcb, /* 0x41 */
trap_fdcb, /* 0x42 */
trap_fdcb, /* 0x43 */
trap_fdcb, /* 0x44 */
trap_fdcb, /* 0x45 */
op_tb0iyd, /* 0x46 */
trap_fdcb, /* 0x47 */
trap_fdcb, /* 0x48 */
trap_fdcb, /* 0x49 */
trap_fdcb, /* 0x4a */
trap_fdcb, /* 0x4b */
trap_fdcb, /* 0x4c */
trap_fdcb, /* 0x4d */
op_tb1iyd, /* 0x4e */
trap_fdcb, /* 0x4f */
trap_fdcb, /* 0x50 */
trap_fdcb, /* 0x51 */
trap_fdcb, /* 0x52 */
trap_fdcb, /* 0x53 */
trap_fdcb, /* 0x54 */
trap_fdcb, /* 0x55 */
op_tb2iyd, /* 0x56 */
trap_fdcb, /* 0x57 */
trap_fdcb, /* 0x58 */
trap_fdcb, /* 0x59 */
trap_fdcb, /* 0x5a */
trap_fdcb, /* 0x5b */
trap_fdcb, /* 0x5c */
trap_fdcb, /* 0x5d */
op_tb3iyd, /* 0x5e */
trap_fdcb, /* 0x5f */
trap_fdcb, /* 0x60 */
trap_fdcb, /* 0x61 */
trap_fdcb, /* 0x62 */
trap_fdcb, /* 0x63 */
trap_fdcb, /* 0x64 */
trap_fdcb, /* 0x65 */
op_tb4iyd, /* 0x66 */
trap_fdcb, /* 0x67 */
trap_fdcb, /* 0x68 */
trap_fdcb, /* 0x69 */
trap_fdcb, /* 0x6a */
trap_fdcb, /* 0x6b */
trap_fdcb, /* 0x6c */
trap_fdcb, /* 0x6d */
op_tb5iyd, /* 0x6e */
trap_fdcb, /* 0x6f */
trap_fdcb, /* 0x70 */
trap_fdcb, /* 0x71 */
trap_fdcb, /* 0x72 */
trap_fdcb, /* 0x73 */
trap_fdcb, /* 0x74 */
trap_fdcb, /* 0x75 */
op_tb6iyd, /* 0x76 */
trap_fdcb, /* 0x77 */
trap_fdcb, /* 0x78 */
trap_fdcb, /* 0x79 */
trap_fdcb, /* 0x7a */
trap_fdcb, /* 0x7b */
trap_fdcb, /* 0x7c */
trap_fdcb, /* 0x7d */
op_tb7iyd, /* 0x7e */
trap_fdcb, /* 0x7f */
trap_fdcb, /* 0x80 */
trap_fdcb, /* 0x81 */
trap_fdcb, /* 0x82 */
trap_fdcb, /* 0x83 */
trap_fdcb, /* 0x84 */
trap_fdcb, /* 0x85 */
op_rb0iyd, /* 0x86 */
trap_fdcb, /* 0x87 */
trap_fdcb, /* 0x88 */
trap_fdcb, /* 0x89 */
trap_fdcb, /* 0x8a */
trap_fdcb, /* 0x8b */
trap_fdcb, /* 0x8c */
trap_fdcb, /* 0x8d */
op_rb1iyd, /* 0x8e */
trap_fdcb, /* 0x8f */
trap_fdcb, /* 0x90 */
trap_fdcb, /* 0x91 */
trap_fdcb, /* 0x92 */
trap_fdcb, /* 0x93 */
trap_fdcb, /* 0x94 */
trap_fdcb, /* 0x95 */
op_rb2iyd, /* 0x96 */
trap_fdcb, /* 0x97 */
trap_fdcb, /* 0x98 */
trap_fdcb, /* 0x99 */
trap_fdcb, /* 0x9a */
trap_fdcb, /* 0x9b */
trap_fdcb, /* 0x9c */
trap_fdcb, /* 0x9d */
op_rb3iyd, /* 0x9e */
trap_fdcb, /* 0x9f */
trap_fdcb, /* 0xa0 */
trap_fdcb, /* 0xa1 */
trap_fdcb, /* 0xa2 */
trap_fdcb, /* 0xa3 */
trap_fdcb, /* 0xa4 */
trap_fdcb, /* 0xa5 */
op_rb4iyd, /* 0xa6 */
trap_fdcb, /* 0xa7 */
trap_fdcb, /* 0xa8 */
trap_fdcb, /* 0xa9 */
trap_fdcb, /* 0xaa */
trap_fdcb, /* 0xab */
trap_fdcb, /* 0xac */
trap_fdcb, /* 0xad */
op_rb5iyd, /* 0xae */
trap_fdcb, /* 0xaf */
trap_fdcb, /* 0xb0 */
trap_fdcb, /* 0xb1 */
trap_fdcb, /* 0xb2 */
trap_fdcb, /* 0xb3 */
trap_fdcb, /* 0xb4 */
trap_fdcb, /* 0xb5 */
op_rb6iyd, /* 0xb6 */
trap_fdcb, /* 0xb7 */
trap_fdcb, /* 0xb8 */
trap_fdcb, /* 0xb9 */
trap_fdcb, /* 0xba */
trap_fdcb, /* 0xbb */
trap_fdcb, /* 0xbc */
trap_fdcb, /* 0xbd */
op_rb7iyd, /* 0xbe */
trap_fdcb, /* 0xbf */
trap_fdcb, /* 0xc0 */
trap_fdcb, /* 0xc1 */
trap_fdcb, /* 0xc2 */
trap_fdcb, /* 0xc3 */
trap_fdcb, /* 0xc4 */
trap_fdcb, /* 0xc5 */
op_sb0iyd, /* 0xc6 */
trap_fdcb, /* 0xc7 */
trap_fdcb, /* 0xc8 */
trap_fdcb, /* 0xc9 */
trap_fdcb, /* 0xca */
trap_fdcb, /* 0xcb */
trap_fdcb, /* 0xcc */
trap_fdcb, /* 0xcd */
op_sb1iyd, /* 0xce */
trap_fdcb, /* 0xcf */
trap_fdcb, /* 0xd0 */
trap_fdcb, /* 0xd1 */
trap_fdcb, /* 0xd2 */
trap_fdcb, /* 0xd3 */
trap_fdcb, /* 0xd4 */
trap_fdcb, /* 0xd5 */
op_sb2iyd, /* 0xd6 */
trap_fdcb, /* 0xd7 */
trap_fdcb, /* 0xd8 */
trap_fdcb, /* 0xd9 */
trap_fdcb, /* 0xda */
trap_fdcb, /* 0xdb */
trap_fdcb, /* 0xdc */
trap_fdcb, /* 0xdd */
op_sb3iyd, /* 0xde */
trap_fdcb, /* 0xdf */
trap_fdcb, /* 0xe0 */
trap_fdcb, /* 0xe1 */
trap_fdcb, /* 0xe2 */
trap_fdcb, /* 0xe3 */
trap_fdcb, /* 0xe4 */
trap_fdcb, /* 0xe5 */
op_sb4iyd, /* 0xe6 */
trap_fdcb, /* 0xe7 */
trap_fdcb, /* 0xe8 */
trap_fdcb, /* 0xe9 */
trap_fdcb, /* 0xea */
trap_fdcb, /* 0xeb */
trap_fdcb, /* 0xec */
trap_fdcb, /* 0xed */
op_sb5iyd, /* 0xee */
trap_fdcb, /* 0xef */
trap_fdcb, /* 0xf0 */
trap_fdcb, /* 0xf1 */
trap_fdcb, /* 0xf2 */
trap_fdcb, /* 0xf3 */
trap_fdcb, /* 0xf4 */
trap_fdcb, /* 0xf5 */
op_sb6iyd, /* 0xf6 */
trap_fdcb, /* 0xf7 */
trap_fdcb, /* 0xf8 */
trap_fdcb, /* 0xf9 */
trap_fdcb, /* 0xfa */
trap_fdcb, /* 0xfb */
trap_fdcb, /* 0xfc */
trap_fdcb, /* 0xfd */
op_sb7iyd, /* 0xfe */
trap_fdcb /* 0xff */
};
register int d;
register int t;
d = (char) *PC++;
#ifdef WANT_PCC
if (PC > ram + 65535) /* correct PC overrun */
PC = ram;
#endif
#ifdef WANT_TIM
t = (*op_fdcb[*PC++]) (d); /* execute next opcode */
#else
(*op_fdcb[*PC++]) (d);
#endif
#ifdef WANT_PCC
if (PC > ram + 65535) /* again correct PC overrun */
PC = ram;
#endif
return(t);
}
/*
* This function traps all illegal opcodes following the
* initial 0xfd 0xcb of a 4 byte opcode.
*/
static int trap_fdcb(void)
{
cpu_error = OPTRAP4;
cpu_state = STOPPED;
return(0L);
}
static int op_tb0iyd(int data) /* BIT 0,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 1) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb1iyd(int data) /* BIT 1,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 2) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb2iyd(int data) /* BIT 2,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 4) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb3iyd(int data) /* BIT 3,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 8) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb4iyd(int data) /* BIT 4,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 16) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb5iyd(int data) /* BIT 5,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 32) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb6iyd(int data) /* BIT 6,(IY+d) */
{
F &= ~(N_FLAG | S_FLAG);
F |= H_FLAG;
(*(ram + IY + data) & 64) ? (F &= ~(Z_FLAG | P_FLAG))
: (F |= (Z_FLAG | P_FLAG));
return(20);
}
static int op_tb7iyd(int data) /* BIT 7,(IY+d) */
{
F &= ~N_FLAG;
F |= H_FLAG;
if (*(ram + IY + data) & 128) {
F &= ~(Z_FLAG | P_FLAG);
F |= S_FLAG;
} else {
F |= (Z_FLAG | P_FLAG);
F &= ~S_FLAG;
}
return(20);
}
static int op_rb0iyd(int data) /* RES 0,(IY+d) */
{
*(ram + IY + data) &= ~1;
return(23);
}
static int op_rb1iyd(int data) /* RES 1,(IY+d) */
{
*(ram + IY + data) &= ~2;
return(23);
}
static int op_rb2iyd(int data) /* RES 2,(IY+d) */
{
*(ram + IY + data) &= ~4;
return(23);
}
static int op_rb3iyd(int data) /* RES 3,(IY+d) */
{
*(ram + IY + data) &= ~8;
return(23);
}
static int op_rb4iyd(int data) /* RES 4,(IY+d) */
{
*(ram + IY + data) &= ~16;
return(23);
}
static int op_rb5iyd(int data) /* RES 5,(IY+d) */
{
*(ram + IY + data) &= ~32;
return(23);
}
static int op_rb6iyd(int data) /* RES 6,(IY+d) */
{
*(ram + IY + data) &= ~64;
return(23);
}
static int op_rb7iyd(int data) /* RES 7,(IY+d) */
{
*(ram + IY + data) &= ~128;
return(23);
}
static int op_sb0iyd(int data) /* SET 0,(IY+d) */
{
*(ram + IY + data) |= 1;
return(23);
}
static int op_sb1iyd(int data) /* SET 1,(IY+d) */
{
*(ram + IY + data) |= 2;
return(23);
}
static int op_sb2iyd(int data) /* SET 2,(IY+d) */
{
*(ram + IY + data) |= 4;
return(23);
}
static int op_sb3iyd(int data) /* SET 3,(IY+d) */
{
*(ram + IY + data) |= 8;
return(23);
}
static int op_sb4iyd(int data) /* SET 4,(IY+d) */
{
*(ram + IY + data) |= 16;
return(23);
}
static int op_sb5iyd(int data) /* SET 5,(IY+d) */
{
*(ram + IY + data) |= 32;
return(23);
}
static int op_sb6iyd(int data) /* SET 6,(IY+d) */
{
*(ram + IY + data) |= 64;
return(23);
}
static int op_sb7iyd(int data) /* SET 7,(IY+d) */
{
*(ram + IY + data) |= 128;
return(23);
}
static int op_rlciyd(int data) /* RLC (IY+d) */
{
register int i;
register BYTE *p;
p = ram + IY + data;
i = *p & 128;
(i) ? (F |= C_FLAG) : (F &= ~C_FLAG);
F &= ~(H_FLAG | N_FLAG);
*p <<= 1;
if (i) *p |= 1;
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}
static int op_rrciyd(int data) /* RRC (IY+d) */
{
register int i;
register BYTE *p;
p = ram + IY + data;
i = *p & 1;
(i) ? (F |= C_FLAG) : (F &= ~C_FLAG);
F &= ~(H_FLAG | N_FLAG);
*p >>= 1;
if (i) *p |= 128;
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}
static int op_rliyd(int data) /* RL (IY+d) */
{
register int old_c_flag;
register BYTE *p;
p = ram + IY + data;
old_c_flag = F & C_FLAG;
(*p & 128) ? (F |= C_FLAG) : (F &= ~C_FLAG);
*p <<= 1;
if (old_c_flag) *p |= 1;
F &= ~(H_FLAG | N_FLAG);
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}
static int op_rriyd(int data) /* RR (IY+d) */
{
register int old_c_flag;
register BYTE *p;
old_c_flag = F & C_FLAG;
p = ram + IY + data;
(*p & 1) ? (F |= C_FLAG) : (F &= ~C_FLAG);
*p >>= 1;
if (old_c_flag) *p |= 128;
F &= ~(H_FLAG | N_FLAG);
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}
static int op_slaiyd(int data) /* SLA (IY+d) */
{
register BYTE *p;
p = ram + IY + data;
(*p & 128) ? (F |= C_FLAG) : (F &= ~C_FLAG);
*p <<= 1;
F &= ~(H_FLAG | N_FLAG);
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}
static int op_sraiyd(int data) /* SRA (IY+d) */
{
register int i;
register BYTE *p;
p = ram + IY + data;
i = *p & 128;
(*p & 1) ? (F |= C_FLAG) : (F &= ~C_FLAG);
*p >>= 1;
*p |= i;
F &= ~(H_FLAG | N_FLAG);
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}
static int op_srliyd(int data) /* SRL (IY+d) */
{
register BYTE *p;
p = ram + IY + data;
(*p & 1) ? (F |= C_FLAG) : (F &= ~C_FLAG);
*p >>= 1;
F &= ~(H_FLAG | N_FLAG);
(*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG);
(*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG);
(parrity[*p]) ? (F &= ~P_FLAG) : (F |= P_FLAG);
return(23);
}