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/* rabadr.c */
/*
* Copyright (C) 1989-2009 Alan R. Baldwin
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*
* Alan R. Baldwin
* 721 Berkeley St.
* Kent, Ohio 44240
*
* ported to the Rabbit2000 by
* Ulrich Raich and Razaq Ijoduola
* PS Division
* CERN
* CH-1211 Geneva-23
* email: Ulrich dot Raich at cern dot ch
*/
/*
* Extensions: P. Felber
*
* Altered by Leland Morrison to support rabbit 2000
* and rabbit 4000 instruction sets (2011)
*/
#include "asxxxx.h"
#include "rab.h"
/*
* Read an address specifier. Pack the
* address information into the supplied
* `expr' structure. Return the mode of
* the address.
*
* This addr(esp) routine performs the following addressing decoding:
*
* address mode flag addr base
* #n S_IMMED 0 n NULL
* label s_type ---- s_addr s_area
* [REG] S_IND+icode 0 0 NULL
* [label] S_INDM ---- s_addr s_area
* offset[REG] S_IND+icode ---- offset ----
*/
int
addr(esp)
struct expr *esp;
{
int c, mode, indx;
if ((c = getnb()) == '#') {
expr(esp, 0);
esp->e_mode = S_IMMED;
#if 0
/* ljm - leading digit is used for offset for dd(ix|iy|sp) */
} else if ((c == '-') || ((c >= '0') && (c <= '9'))) {
unget(c);
expr(esp, 0);
esp->e_mode = S_IMMED;
#endif
} else
if (c == LFIND) {
/* ljm comment -
* '(' number ')'
* or '(' register=[hl,ix,iy,sp,bc,de] ')'
* ref to memory, scan the next 'symbol' to see if
* it is a register or an absolute address
*/
if ((indx = admode(R8)) != 0) {
mode = S_INDB;
} else
if ((indx = admode(R8X)) != 0) {
mode = S_R8X;
aerr();
} else
if ((indx = admode(R16X)) != 0) {
mode = S_R16X;
aerr();
} else
if ((indx = admode(R16)) != 0) {
mode = S_INDR;
} else {
mode = S_INDM;
expr(esp, 0);
esp->e_mode = mode;
}
if (indx) {
esp->e_mode = (mode + indx)&0xFF;
esp->e_base.e_ap = NULL;
}
/* ljm comment -
* flag an error if the closing paren is absent
*/
if ((c = getnb()) != RTIND) {
qerr();
}
} else {
unget(c);
/* ljm -
* cases:
* register
* symbol
* symbol(register)
* number
* number(register)
*
* scan the list(s) of registers to see if the
* name matches the name of one of the processor
* registers
*/
if ((indx = admode(R8)) != 0) {
mode = S_R8;
} else
if ((indx = admode(R8X)) != 0) {
mode = S_R8X;
} else
if ((indx = admode(R16X)) != 0) {
mode = S_R16X;
} else
if ((indx = admode(R16)) != 0) {
mode = S_R16;
} else
if ((indx = admode(R32_JKHL)) != 0) {
mode = S_R32_JKHL;
} else
if ((indx = admode(R32_BCDE)) != 0) {
mode = S_R32_BCDE;
} else
if ((indx = admode(RXPC)) != 0) {
mode = S_RXPC;
} else {
mode = S_USER;
expr(esp, 0);
esp->e_mode = mode;
}
if (indx) {
esp->e_addr = indx&0xFF;
esp->e_mode = mode;
esp->e_base.e_ap = NULL;
}
if ((c = getnb()) == LFIND) {
indx = admode(R16);
if ((indx&0xFF)==IX || (indx&0xFF)==IY ||
(indx&0xFF)==SP)
{
esp->e_mode = S_INDR + (indx&0xFF);
} else if ( (indx&0xFF)==HL ) {
esp->e_mode = S_IDHL_OFFSET;
} else {
aerr();
}
if ((c = getnb()) != RTIND)
qerr();
} else {
unget(c);
}
}
return (esp->e_mode);
}
/*
* Enter admode() to search a specific addressing mode table
* for a match. Return the addressing value on a match or
* zero for no match.
*/
int
admode(sp)
struct adsym *sp;
{
char *ptr;
int i;
char *ips;
ips = ip;
unget(getnb());
i = 0;
while ( *(ptr = &sp[i].a_str[0]) ) {
if (srch(ptr)) {
return(sp[i].a_val);
}
i++;
}
ip = ips;
return(0);
}
/*
* srch --- does string match ?
*/
int
srch(str)
char *str;
{
char *ptr;
ptr = ip;
while (*ptr && *str) {
if (ccase[*ptr & 0x007F] != ccase[*str & 0x007F])
break;
ptr++;
str++;
}
if (ccase[*ptr & 0x007F] == ccase[*str & 0x007F]) {
ip = ptr;
return(1);
}
if (!*str) {
if (!(ctype[*ptr & 0x007F] & LTR16)) {
ip = ptr;
return(1);
}
}
return(0);
}
/*
* Registers
*/
struct adsym R8[] = {
{ "b", B|0400 },
{ "c", C|0400 },
{ "d", D|0400 },
{ "e", E|0400 },
{ "h", H|0400 },
{ "l", L|0400 },
{ "a", A|0400 },
{ "", 0000 }
};
struct adsym R8X[] = {
{ "eir", EIR|0400},
{ "iir", IIR|0400},
{ "", 0000 }
};
struct adsym R8IP[] = {
{ "ip", IP|0400 },
{ "", 0000 }
};
struct adsym R16[] = {
{ "bc", BC|0400 },
{ "de", DE|0400 },
{ "hl", HL|0400 },
{ "sp", SP|0400 },
{ "ix", IX|0400 },
{ "iy", IY|0400 },
{ "", 0000 }
};
struct adsym R16X[] = {
{ "af'", AF|0400 }, /* af' must be first !!! */
{ "af", AF|0400 },
{ "", 0000 }
};
struct adsym R32_BCDE[] = {
{ "bcde", BCDE|0400 },
{ "", 0000 }
};
struct adsym R32_JKHL[] = {
{ "jkhl", JKHL|0400 },
{ "", 0000 }
};
struct adsym RXPC[] = {
{ "xpc", 1|0400 },
{ "", 0000 }
};
/*
* Conditional definitions
*/
struct adsym CND[] = {
{ "NZ", NZ|0400 },
{ "Z", Z |0400 },
{ "NC", NC|0400 },
{ "C", CS|0400 },
{ "LZ", PO|0400 },
{ "LO", PE|0400 },
{ "P", P |0400 },
{ "M", M |0400 },
{ "", 0000 }
};
struct adsym ALT_CND[] = {
{ "GT", CC_GT|0400 },
{ "GTU", CC_GTU|0400 },
{ "LT", CC_LT|0400 },
{ "V", CC_V |0400 },
{ "NZ", CC_NZ|0400 },
{ "Z", CC_Z |0400 },
{ "NC", CC_NC|0400 },
{ "C", CC_C |0400 },
{ "", 0000 }
};
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