/* * Z80SIM - a Z80-CPU simulator * * Copyright (C) 1987-92 by Udo Munk * * This module of the Z80-CPU simulator must not be modified by a user, * see license agreement! * * 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 */ /* * Like the function "cpu()" this one emulates multi byte opcodes * starting with 0xfd */ #include "sim.h" #include "simglb.h" long op_fd_handel() { long trap_fd(); long op_popiy(), op_pusiy(); long op_jpiy(); long op_exspy(); long op_ldspy(); long op_ldiynn(), op_ldiyinn(), op_ldiny(); long op_adayd(), op_acayd(), op_suayd(), op_scayd(); long op_andyd(), op_xoryd(), op_oryd(), op_cpyd(); long op_decyd(), op_incyd(); long op_addyb(), op_addyd(), op_addys(), op_addyy(); long op_andyd(), op_xoryd(), op_oryd(), op_cpyd(); long op_decyd(), op_incyd(); long op_inciy(), op_deciy(); long op_ldayd(), op_ldbyd(), op_ldcyd(), op_lddyd(), op_ldeyd(); long op_ldhyd(), op_ldlyd(); long op_ldyda(), op_ldydb(), op_ldydc(), op_ldydd(), op_ldyde(); long op_ldydh(), op_ldydl(), op_ldydn(); extern long op_fdcb_handel(); static long (*op_fd[256]) () = { trap_fd, /* 0x00 */ trap_fd, /* 0x01 */ trap_fd, /* 0x02 */ trap_fd, /* 0x03 */ trap_fd, /* 0x04 */ trap_fd, /* 0x05 */ trap_fd, /* 0x06 */ trap_fd, /* 0x07 */ trap_fd, /* 0x08 */ op_addyb, /* 0x09 */ trap_fd, /* 0x0a */ trap_fd, /* 0x0b */ trap_fd, /* 0x0c */ trap_fd, /* 0x0d */ trap_fd, /* 0x0e */ trap_fd, /* 0x0f */ trap_fd, /* 0x10 */ trap_fd, /* 0x11 */ trap_fd, /* 0x12 */ trap_fd, /* 0x13 */ trap_fd, /* 0x14 */ trap_fd, /* 0x15 */ trap_fd, /* 0x16 */ trap_fd, /* 0x17 */ trap_fd, /* 0x18 */ op_addyd, /* 0x19 */ trap_fd, /* 0x1a */ trap_fd, /* 0x1b */ trap_fd, /* 0x1c */ trap_fd, /* 0x1d */ trap_fd, /* 0x1e */ trap_fd, /* 0x1f */ trap_fd, /* 0x20 */ op_ldiynn, /* 0x21 */ op_ldiny, /* 0x22 */ op_inciy, /* 0x23 */ trap_fd, /* 0x24 */ trap_fd, /* 0x25 */ trap_fd, /* 0x26 */ trap_fd, /* 0x27 */ trap_fd, /* 0x28 */ op_addyy, /* 0x29 */ op_ldiyinn, /* 0x2a */ op_deciy, /* 0x2b */ trap_fd, /* 0x2c */ trap_fd, /* 0x2d */ trap_fd, /* 0x2e */ trap_fd, /* 0x2f */ trap_fd, /* 0x30 */ trap_fd, /* 0x31 */ trap_fd, /* 0x32 */ trap_fd, /* 0x33 */ op_incyd, /* 0x34 */ op_decyd, /* 0x35 */ op_ldydn, /* 0x36 */ trap_fd, /* 0x37 */ trap_fd, /* 0x38 */ op_addys, /* 0x39 */ trap_fd, /* 0x3a */ trap_fd, /* 0x3b */ trap_fd, /* 0x3c */ trap_fd, /* 0x3d */ trap_fd, /* 0x3e */ trap_fd, /* 0x3f */ trap_fd, /* 0x40 */ trap_fd, /* 0x41 */ trap_fd, /* 0x42 */ trap_fd, /* 0x43 */ trap_fd, /* 0x44 */ trap_fd, /* 0x45 */ op_ldbyd, /* 0x46 */ trap_fd, /* 0x47 */ trap_fd, /* 0x48 */ trap_fd, /* 0x49 */ trap_fd, /* 0x4a */ trap_fd, /* 0x4b */ trap_fd, /* 0x4c */ trap_fd, /* 0x4d */ op_ldcyd, /* 0x4e */ trap_fd, /* 0x4f */ trap_fd, /* 0x50 */ trap_fd, /* 0x51 */ trap_fd, /* 0x52 */ trap_fd, /* 0x53 */ trap_fd, /* 0x54 */ trap_fd, /* 0x55 */ op_lddyd, /* 0x56 */ trap_fd, /* 0x57 */ trap_fd, /* 0x58 */ trap_fd, /* 0x59 */ trap_fd, /* 0x5a */ trap_fd, /* 0x5b */ trap_fd, /* 0x5c */ trap_fd, /* 0x5d */ op_ldeyd, /* 0x5e */ trap_fd, /* 0x5f */ trap_fd, /* 0x60 */ trap_fd, /* 0x61 */ trap_fd, /* 0x62 */ trap_fd, /* 0x63 */ trap_fd, /* 0x64 */ trap_fd, /* 0x65 */ op_ldhyd, /* 0x66 */ trap_fd, /* 0x67 */ trap_fd, /* 0x68 */ trap_fd, /* 0x69 */ trap_fd, /* 0x6a */ trap_fd, /* 0x6b */ trap_fd, /* 0x6c */ trap_fd, /* 0x6d */ op_ldlyd, /* 0x6e */ trap_fd, /* 0x6f */ op_ldydb, /* 0x70 */ op_ldydc, /* 0x71 */ op_ldydd, /* 0x72 */ op_ldyde, /* 0x73 */ op_ldydh, /* 0x74 */ op_ldydl, /* 0x75 */ trap_fd, /* 0x76 */ op_ldyda, /* 0x77 */ trap_fd, /* 0x78 */ trap_fd, /* 0x79 */ trap_fd, /* 0x7a */ trap_fd, /* 0x7b */ trap_fd, /* 0x7c */ trap_fd, /* 0x7d */ op_ldayd, /* 0x7e */ trap_fd, /* 0x7f */ trap_fd, /* 0x80 */ trap_fd, /* 0x81 */ trap_fd, /* 0x82 */ trap_fd, /* 0x83 */ trap_fd, /* 0x84 */ trap_fd, /* 0x85 */ op_adayd, /* 0x86 */ trap_fd, /* 0x87 */ trap_fd, /* 0x88 */ trap_fd, /* 0x89 */ trap_fd, /* 0x8a */ trap_fd, /* 0x8b */ trap_fd, /* 0x8c */ trap_fd, /* 0x8d */ op_acayd, /* 0x8e */ trap_fd, /* 0x8f */ trap_fd, /* 0x90 */ trap_fd, /* 0x91 */ trap_fd, /* 0x92 */ trap_fd, /* 0x93 */ trap_fd, /* 0x94 */ trap_fd, /* 0x95 */ op_suayd, /* 0x96 */ trap_fd, /* 0x97 */ trap_fd, /* 0x98 */ trap_fd, /* 0x99 */ trap_fd, /* 0x9a */ trap_fd, /* 0x9b */ trap_fd, /* 0x9c */ trap_fd, /* 0x9d */ op_scayd, /* 0x9e */ trap_fd, /* 0x9f */ trap_fd, /* 0xa0 */ trap_fd, /* 0xa1 */ trap_fd, /* 0xa2 */ trap_fd, /* 0xa3 */ trap_fd, /* 0xa4 */ trap_fd, /* 0xa5 */ op_andyd, /* 0xa6 */ trap_fd, /* 0xa7 */ trap_fd, /* 0xa8 */ trap_fd, /* 0xa9 */ trap_fd, /* 0xaa */ trap_fd, /* 0xab */ trap_fd, /* 0xac */ trap_fd, /* 0xad */ op_xoryd, /* 0xae */ trap_fd, /* 0xaf */ trap_fd, /* 0xb0 */ trap_fd, /* 0xb1 */ trap_fd, /* 0xb2 */ trap_fd, /* 0xb3 */ trap_fd, /* 0xb4 */ trap_fd, /* 0xb5 */ op_oryd, /* 0xb6 */ trap_fd, /* 0xb7 */ trap_fd, /* 0xb8 */ trap_fd, /* 0xb9 */ trap_fd, /* 0xba */ trap_fd, /* 0xbb */ trap_fd, /* 0xbc */ trap_fd, /* 0xbd */ op_cpyd, /* 0xbe */ trap_fd, /* 0xbf */ trap_fd, /* 0xc0 */ trap_fd, /* 0xc1 */ trap_fd, /* 0xc2 */ trap_fd, /* 0xc3 */ trap_fd, /* 0xc4 */ trap_fd, /* 0xc5 */ trap_fd, /* 0xc6 */ trap_fd, /* 0xc7 */ trap_fd, /* 0xc8 */ trap_fd, /* 0xc9 */ trap_fd, /* 0xca */ op_fdcb_handel, /* 0xcb */ trap_fd, /* 0xcc */ trap_fd, /* 0xcd */ trap_fd, /* 0xce */ trap_fd, /* 0xcf */ trap_fd, /* 0xd0 */ trap_fd, /* 0xd1 */ trap_fd, /* 0xd2 */ trap_fd, /* 0xd3 */ trap_fd, /* 0xd4 */ trap_fd, /* 0xd5 */ trap_fd, /* 0xd6 */ trap_fd, /* 0xd7 */ trap_fd, /* 0xd8 */ trap_fd, /* 0xd9 */ trap_fd, /* 0xda */ trap_fd, /* 0xdb */ trap_fd, /* 0xdc */ trap_fd, /* 0xdd */ trap_fd, /* 0xde */ trap_fd, /* 0xdf */ trap_fd, /* 0xe0 */ op_popiy, /* 0xe1 */ trap_fd, /* 0xe2 */ op_exspy, /* 0xe3 */ trap_fd, /* 0xe4 */ op_pusiy, /* 0xe5 */ trap_fd, /* 0xe6 */ trap_fd, /* 0xe7 */ trap_fd, /* 0xe8 */ op_jpiy, /* 0xe9 */ trap_fd, /* 0xea */ trap_fd, /* 0xeb */ trap_fd, /* 0xec */ trap_fd, /* 0xed */ trap_fd, /* 0xee */ trap_fd, /* 0xef */ trap_fd, /* 0xf0 */ trap_fd, /* 0xf1 */ trap_fd, /* 0xf2 */ trap_fd, /* 0xf3 */ trap_fd, /* 0xf4 */ trap_fd, /* 0xf5 */ trap_fd, /* 0xf6 */ trap_fd, /* 0xf7 */ trap_fd, /* 0xf8 */ op_ldspy, /* 0xf9 */ trap_fd, /* 0xfa */ trap_fd, /* 0xfb */ trap_fd, /* 0xfc */ trap_fd, /* 0xfd */ trap_fd, /* 0xfe */ trap_fd /* 0xff */ }; #ifdef WANT_TIM register long t; t = (*op_fd[*PC++]) (); /* execute next opcode */ #else (*op_fd[*PC++]) (); #endif #ifdef WANT_PCC if (PC > ram + 65535) /* correct PC overrun */ PC = ram; #endif #ifdef WANT_TIM return(t); #endif } /* * This function traps all illegal opcodes following the * initial 0xfd of a multi byte opcode. */ static long trap_fd() { cpu_error = OPTRAP2; cpu_state = STOPPED; #ifdef WANT_TIM return(0L); #endif } static long op_popiy() /* POP IY */ { #ifdef WANT_SPC if (STACK <= ram) STACK = ram + 65536L; #endif IY = *STACK++; #ifdef WANT_SPC if (STACK <= ram) STACK = ram + 65536L; #endif IY += *STACK++ << 8; #ifdef WANT_TIM return(14L); #endif } static long op_pusiy() /* PUSH IY */ { #ifdef WANT_SPC if (STACK <= ram) STACK = ram + 65536L; #endif *--STACK = IY >> 8; #ifdef WANT_SPC if (STACK <= ram) STACK = ram + 65536L; #endif *--STACK = IY; #ifdef WANT_TIM return(15L); #endif } static long op_jpiy() /* JP (IY) */ { PC = ram + IY; #ifdef WANT_TIM return(8L); #endif } static long op_exspy() /* EX (SP),IY */ { register int i; i = *STACK + (*(STACK + 1) << 8); *STACK = IY; *(STACK + 1) = IY >> 8; IY = i; #ifdef WANT_TIM return(23L); #endif } static long op_ldspy() /* LD SP,IY */ { STACK = ram + IY; #ifdef WANT_TIM return(10L); #endif } static long op_ldiynn() /* LD IY,nn */ { IY = *PC++; IY += *PC++ << 8; #ifdef WANT_TIM return(14L); #endif } static long op_ldiyinn() /* LD IY,(nn) */ { register BYTE *p; p = ram + *PC++; p += *PC++ << 8; IY = *p++; IY += *p << 8; #ifdef WANT_TIM return(20L); #endif } static long op_ldiny() /* LD (nn),IY */ { register BYTE *p; p = ram + *PC++; p += *PC++ << 8; *p++ = IY; *p = IY >> 8; #ifdef WANT_TIM return(20L); #endif } static long op_adayd() /* ADD A,(IY+d) */ { register int i; register BYTE P; P = *(ram + IY + (char) *PC++); ((A & 0xf) + (P & 0xf) > 0xf) ? (F |= H_FLAG) : (F &= ~H_FLAG); (A + P > 255) ? (F |= C_FLAG) : (F &= ~C_FLAG); A = i = (char) A + (char) P; (i < -128 || i > 127) ? (F |= P_FLAG) : (F &= ~P_FLAG); (i & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F &= ~N_FLAG; #ifdef WANT_TIM return(19L); #endif } static long op_acayd() /* ADC A,(IY+d) */ { register int i, carry; register BYTE P; carry = (F & C_FLAG) ? 1 : 0; P = *(ram + IY + (char) *PC++); ((A & 0xf) + (P & 0xf) + carry > 0xf) ? (F |= H_FLAG) : (F &= ~H_FLAG); (A + P + carry > 255) ? (F |= C_FLAG) : (F &= ~C_FLAG); A = i = (char) A + (char) P + carry; (i < -128 || i > 127) ? (F |= P_FLAG) : (F &= ~P_FLAG); (i & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F &= ~N_FLAG; #ifdef WANT_TIM return(19L); #endif } static long op_suayd() /* SUB A,(IY+d) */ { register int i; register BYTE P; P = *(ram + IY + (char) *PC++); ((P & 0xf) > (A & 0xf)) ? (F |= H_FLAG) : (F &= ~H_FLAG); (P > A) ? (F |= C_FLAG) : (F &= ~C_FLAG); A = i = (char) A - (char) P; (i < -128 || i > 127) ? (F |= P_FLAG) : (F &= ~P_FLAG); (i & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F |= N_FLAG; #ifdef WANT_TIM return(19L); #endif } static long op_scayd() /* SBC A,(IY+d) */ { register int i, carry; register BYTE P; carry = (F & C_FLAG) ? 1 : 0; P = *(ram + IY + (char) *PC++); ((P & 0xf) + carry > (A & 0xf)) ? (F |= H_FLAG) : (F &= ~H_FLAG); (P + carry > A) ? (F |= C_FLAG) : (F &= ~C_FLAG); A = i = (char) A - (char) P - carry; (i < -128 || i > 127) ? (F |= P_FLAG) : (F &= ~P_FLAG); (i & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F |= N_FLAG; #ifdef WANT_TIM return(19L); #endif } static long op_andyd() /* AND (IY+d) */ { A &= *(ram + IY + (char) *PC++); (A & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F |= H_FLAG; (parrity[A]) ? (F &= ~P_FLAG) : (F |= P_FLAG); F &= ~(N_FLAG | C_FLAG); #ifdef WANT_TIM return(19L); #endif } static long op_xoryd() /* XOR (IY+d) */ { A ^= *(ram + IY + (char) *PC++); (A & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); (parrity[A]) ? (F &= ~P_FLAG) : (F |= P_FLAG); F &= ~(H_FLAG | N_FLAG | C_FLAG); #ifdef WANT_TIM return(19L); #endif } static long op_oryd() /* OR (IY+d) */ { A |= *(ram + IY + (char) *PC++); (A & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (A) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); (parrity[A]) ? (F &= ~P_FLAG) : (F |= P_FLAG); F &= ~(H_FLAG | N_FLAG | C_FLAG); #ifdef WANT_TIM return(19L); #endif } static long op_cpyd() /* CP (IY+d) */ { register int i; register BYTE P; P = *(ram + IY + (char) *PC++); ((P & 0xf) > (A & 0xf)) ? (F |= H_FLAG) : (F &= ~H_FLAG); (P > A) ? (F |= C_FLAG) : (F &= ~C_FLAG); i = (char) A - (char) P; (i < -128 || i > 127) ? (F |= P_FLAG) : (F &= ~P_FLAG); (i & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (i) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F |= N_FLAG; #ifdef WANT_TIM return(19L); #endif } static long op_incyd() /* INC (IY+d) */ { register BYTE *p; p = ram + IY + (char) *PC++; ((*p & 0xf) + 1 > 0xf) ? (F |= H_FLAG) : (F &= ~H_FLAG); (*p)++; (*p == 128) ? (F |= P_FLAG) : (F &= ~P_FLAG); (*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F &= ~N_FLAG; #ifdef WANT_TIM return(23L); #endif } static long op_decyd() /* DEC (IY+d) */ { register BYTE *p; p = ram + IY + (char) *PC++; ((*p - 1 & 0xf) == 0xf) ? (F |= H_FLAG) : (F &= ~H_FLAG); (*p)--; (*p == 127) ? (F |= P_FLAG) : (F &= ~P_FLAG); (*p & 128) ? (F |= S_FLAG) : (F &= ~S_FLAG); (*p) ? (F &= ~Z_FLAG) : (F |= Z_FLAG); F |= N_FLAG; #ifdef WANT_TIM return(23L); #endif } static long op_addyb() /* ADD IY,BC */ { register long i; i = (((long)IY) + (((long)B) << 8) + C); (i > 0xffffL) ? (F |= C_FLAG) : (F &= ~C_FLAG); IY = i; F &= ~N_FLAG; #ifdef WANT_TIM return(15L); #endif } static long op_addyd() /* ADD IY,DE */ { register long i; i = (((long)IY) + (((long)D) << 8) + E); (i > 0xffffL) ? (F |= C_FLAG) : (F &= ~C_FLAG); IY = i; F &= ~N_FLAG; #ifdef WANT_TIM return(15L); #endif } static long op_addys() /* ADD IY,SP */ { register long i; i = ((long)IY) + ((long)STACK) - ((long)ram); (i > 0xffffL) ? (F |= C_FLAG) : (F &= ~C_FLAG); IY = i; F &= ~N_FLAG; #ifdef WANT_TIM return(15L); #endif } static long op_addyy() /* ADD IY,IY */ { register long i; i = (((long)IY) << 1); (i > 0xffffL) ? (F |= C_FLAG) : (F &= ~C_FLAG); IY = i; F &= ~N_FLAG; #ifdef WANT_TIM return(15L); #endif } static long op_inciy() /* INC IY */ { IY++; #ifdef WANT_TIM return(10L); #endif } static long op_deciy() /* DEC IY */ { IY--; #ifdef WANT_TIM return(10L); #endif } static long op_ldayd() /* LD A,(IY+d) */ { A = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_ldbyd() /* LD B,(IY+d) */ { B = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_ldcyd() /* LD C,(IY+d) */ { C = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_lddyd() /* LD D,(IY+d) */ { D = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_ldeyd() /* LD E,(IY+d) */ { E = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_ldhyd() /* LD H,(IY+d) */ { H = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_ldlyd() /* LD L,(IY+d) */ { L = *(IY + (char) *PC++ + ram); #ifdef WANT_TIM return(19L); #endif } static long op_ldyda() /* LD (IY+d),A */ { *(IY + (char) *PC++ + ram) = A; #ifdef WANT_TIM return(19L); #endif } static long op_ldydb() /* LD (IY+d),B */ { *(IY + (char) *PC++ + ram) = B; #ifdef WANT_TIM return(19L); #endif } static long op_ldydc() /* LD (IY+d),C */ { *(IY + (char) *PC++ + ram) = C; #ifdef WANT_TIM return(19L); #endif } static long op_ldydd() /* LD (IY+d),D */ { *(IY + (char) *PC++ + ram) = D; #ifdef WANT_TIM return(19L); #endif } static long op_ldyde() /* LD (IY+d),E */ { *(IY + (char) *PC++ + ram) = E; #ifdef WANT_TIM return(19L); #endif } static long op_ldydh() /* LD (IY+d),H */ { *(IY + (char) *PC++ + ram) = H; #ifdef WANT_TIM return(19L); #endif } static long op_ldydl() /* LD (IY+d),L */ { *(IY + (char) *PC++ + ram) = L; #ifdef WANT_TIM return(19L); #endif } static long op_ldydn() /* LD (IY+d),n */ { register int d; d = (char) *PC++; *(IY + d + ram) = *PC++; #ifdef WANT_TIM return(19L); #endif }