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opc69.c
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opc69.c
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/*
opc69.c - Part of macxx, a cross assembler family for various micro-processors
Copyright (C) 2008 David Shepperd
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
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/>.
*/
/******************************************************************************
Change Log
12/26/2023 - Bug Fix, Failing to check all symbols of an T.G.
expression for base page
12/07/2023 - Bug Fix, improper use of check for DPAGE T.G.
resulting in DPAGE address mode instead of extended
address mode when not in DPAGE address range.
12/06/2023 - Bug Fix, allow true 16 bit offsets for T.G.
LEAr instructions
11/30/2023 - Fixed errors when using -2 pass option T.G.
MACxx being a single pass assembler with a 2 pass
option both must create the same obj files.
12/27/2022 - Fixed dpage problem that was causing LLF Truncation
warnings for dpage offsets.
Added some Error checking Tim Giddens
12/15/2022 - Fixed optimization problem, was not working for all
@0(r) instructions.
Cleaned up code some. Tim Giddens
03/26/2022 - 6809 CPU support added by Tim Giddens
using David Shepperd's work as a reference
The 6809 has three offset modes
5 bit - uses one byte -16 to +15 n(r)
8 bit - uses two bytes -128 to +127 nn(r)
16 bit - uses three bytes -32768 to +32767 nnnn(r)
Optimization:
Motorola states that any @n(r) or n(r) instruction use 8 bit offset mode
@(r) and @0(r) are both legal instructions and use an offset of zero to perform
the same function only difference is that @(r) uses one byte and @0(r) uses
two bytes. MAC69 has been optimized to convert all @0(r) instructions into
@(r) this saves one byte of memory for each occurrence of these instructions.
******************************************************************************/
#if !defined(MAC_69)
#define MAC_69
#endif
#include "token.h"
#include "pst_tokens.h"
#include "exproper.h"
#include "listctrl.h"
#include "psttkn69.h"
#include "add_defs.h"
#include "memmgt.h"
#define DEFNAM(name,numb) {"name",name,numb},
/* The following are variables specific to the particular assembler */
char macxx_name[] = "mac69";
char *macxx_target = "6809";
char *macxx_descrip = "Cross assembler for the 6809.";
#if 0
unsigned short macxx_rel_salign = 0; /* default alignment for .REL. segment */
unsigned short macxx_rel_dalign = 0; /* default alignment for data in .REL. segment */
unsigned short macxx_abs_salign = 0; /* default alignments for .ABS. segment */
unsigned short macxx_abs_dalign = 0;
#else
unsigned short macxx_salign = 0; /* default alignment segments by LLF */
unsigned short macxx_dalign = 0; /* default alignment data within segment */
#endif
unsigned short macxx_min_dalign = 0;
char macxx_mau = 8; /* number of bits/minimum addressable unit */
char macxx_bytes_mau = 1; /* number of bytes/mau */
char macxx_mau_byte = 1; /* number of mau's in a byte */
char macxx_mau_word = 2; /* number of mau's in a word */
char macxx_mau_long = 4; /* number of mau's in a long */
char macxx_nibbles_byte = 2; /* For the listing output routines */
char macxx_nibbles_word = 4;
char macxx_nibbles_long = 8;
unsigned long macxx_edm_default = ED_AMA | ED_M68 | ED_TRUNC; /* default edmask */
unsigned long macxx_lm_default = ~(LIST_ME | LIST_MEB | LIST_MES | LIST_LD | LIST_COD); /* default list mask */
int current_radix = 16; /* default the radix to hexdecimal */
char expr_open = '<'; /* char that opens an expression */
char expr_close = '>'; /* char that closes an expression */
char expr_escape = '^'; /* char that escapes an expression term */
char macro_arg_open = '<'; /* char that opens a macro argument */
char macro_arg_close = '>'; /* char that closes a macro argument */
char macro_arg_escape = '^'; /* char that escapes a macro argument */
char macro_arg_gensym = '?'; /* char indicating generated symbol for macro */
char macro_arg_genval = '\\'; /* char indicating generated value for macro */
char open_operand = '('; /* char that opens an operand indirection */
char close_operand = ')'; /* char that closes an operand indirection */
int max_opcode_length = 6; /* significant length of opcodes */
int max_symbol_length = 6; /* significant length of symbols */
extern int dotwcontext;
extern int no_white_space_allowed;
static char *am_ptr;
static char *tmp_ptr;
enum
{
CPU_DEFABS, /* default to absolute addressing */
CPU_DEFLNG, /* default to long addressing */
CPU_DEFDIR /* default to direct addressing */
} cpu_defam;
/* End of processor specific stuff */
enum amflag
{
MNBI = 1,
FIN = MNBI << 1,
LFIN = FIN << 1,
OPENAT = LFIN << 1,
OPENBKT = OPENAT << 1,
GOTSTK = OPENBKT << 1
};
typedef struct
{
int flag; /* .ne. if value is expression */
unsigned long value; /* value if not expression */
EXP_stk *exptr; /* ptr to expression stack */
} DPage;
DPage **dpage;
static int dpage_size,dpage_stack;
int ust_init(void)
{
dpage_size = 16;
dpage = (DPage **)MEM_alloc(dpage_size * sizeof(DPage *));
return 0; /* would fill a user symbol table */
}
static int check_4_dpage(EXP_stk *estk)
{
DPage *dp;
EXPR_struct *expr;
expr = estk->stack;
dp = *(dpage + dpage_stack);
if ( dp == 0 )
{
if ( (estk->ptr == 1) && /* or expression is < 256 */
(expr->expr_code == EXPR_VALUE) &&
((expr->expr_value & -256) == 0) &&
(estk->forward_reference == 0) )
return 1;
}
else
{
if ( (estk->ptr == 1) && /* or expression is < 256 */
(expr->expr_code == EXPR_VALUE) &&
((expr->expr_value & -256) == ((dp->value) << 8)) &&
(estk->forward_reference == 0) )
return 1;
}
return 0;
}
static int make_dpage_ref(EXP_stk *estk)
{
DPage *dp;
EXP_stk *dpstk;
EXPR_struct * src,*dst;
int i;
dp = *dpage + dpage_stack;
if ( dp == 0 )
return 0; /* nothing to do */
dst = estk->stack + estk->ptr;
dpstk = dp->exptr;
src = dpstk->stack;
i = dpstk->ptr + estk->ptr + 1;
if ( i >= EXPR_MAXDEPTH )
{
bad_token((char *)0, "Direct page expression too complex");
return 0;
}
memcpy(dst, src, dpstk->ptr * sizeof(EXPR_struct));
dst->expr_value = ((dst->expr_value) << 8);
dst += dpstk->ptr;
dst->expr_code = EXPR_OPER;
dst->expr_value = '-';
estk->ptr += dpstk->ptr + 1;
estk->tag = 'c';
estk->ptr = compress_expr(estk);
return 0;
}
int op_dpage(void)
{
int i, cnt, typ;
DPage *dp;
typ = get_token(); /* pickup the next token */
if ( typ == EOL )
{
pop_dpage:
if ( dpage_stack > 0 )
{
if ( dpage_stack < 2 ||
*dpage + dpage_stack != *dpage + (dpage_stack - 1) )
MEM_free((char *)dpage[dpage_stack]);
*(dpage + dpage_stack) = 0;
--dpage_stack;
}
return 2;
}
i = exprs(1, &EXP0); /* evaluate the expression */
if ( i == 0 || *inp_ptr == ',' )
{ /* are we supposed to save the old dpage? */
int typ;
++inp_ptr; /* eat the comma */
typ = get_token(); /* pick up the next token */
if ( typ == TOKEN_strng )
{
int len = token_value;
if ( strncmp("SAVE", token_pool, len) == 0 )
{
if ( ++dpage_stack >= dpage_size )
{
int new = dpage_stack + dpage_stack / 2;
dpage = (DPage **)MEM_realloc((char *)dpage, new * sizeof(DPage *));
}
if ( i == 0 )
{
*(dpage + dpage_stack) = *(dpage + (dpage_stack - 1));
return 2;
}
}
else if ( strncmp("RESTORE", token_pool, len) == 0 )
{
if ( i > 0 )
bad_token((char *)0, "Expression ignored on dpage RESTORE");
goto pop_dpage;
}
else
{
bad_token(tkn_ptr, "Expected one of SAVE or RESTORE");
f1_eatit();
}
}
else if ( typ == EOL )
goto pop_dpage;
}
if ( i > 0 )
{ /* if 1 or more terms... */
EXP_stk *exp_ptr;
cnt = sizeof(DPage) + i * sizeof(EXPR_struct) + sizeof(EXP_stk);
misc_pool_used += cnt;
dp = (DPage *)MEM_alloc(cnt);
*(dpage + dpage_stack) = dp; /* save it for later */
exp_ptr = (EXP_stk *)(dp + 1);
memcpy(exp_ptr, &EXP0, sizeof(EXP_stk));
exp_ptr->stack = (EXPR_struct *)(exp_ptr + 1);
memcpy(exp_ptr->stack, EXP0.stack, i * sizeof(EXPR_struct));
dp->exptr = exp_ptr;
if ( i == 1 && EXP0SP->expr_code == EXPR_VALUE )
{
if ( EXP0SP->expr_value > 65535 || EXP0SP->expr_value < -65536 )
{
bad_token((char *)0, "Direct page value must resolve to a 16 bit value");
}
else
{
dp->value = exp_ptr->stack->expr_value = EXP0SP->expr_value;
}
}
else
{
dp->flag = 1; /* signal that there's an expression */
}
return 2; /* and quit */
}
EXP0.psuedo_value = 0;
return 2;
}
static void do_branch(Opcode *opc)
{
long offset;
EXPR_struct *exp_ptr;
offset = (opc->op_amode & SPL) ? 4 : 2;
if ( (opc->op_amode & SPL) && (!(opc->op_amode & SP10)) )
offset = 3;
get_token();
if ( exprs(1, &EXP1) < 1 )
{ /* expression nfg or not present */
exp_ptr = EXP1.stack;
exp_ptr->expr_code = EXPR_VALUE; /* make it a 0 */
exp_ptr->expr_value = -offset; /* make it a br . */
EXP1.ptr = 1;
}
else
{
exp_ptr = EXP1.stack + EXP1.ptr;
exp_ptr->expr_code = EXPR_SEG;
exp_ptr->expr_value = current_offset + offset;
(exp_ptr++)->expr_seg = current_section;
exp_ptr->expr_code = EXPR_OPER;
exp_ptr->expr_value = '-';
EXP1.ptr += 2;
}
EXP1.ptr = compress_expr(&EXP1);
/* in file pass2.c tag values */
/* lower case 'y' causes low byte then high byte Upper case 'Y' is high byte then low byte */
EXP1.tag = (opc->op_amode & SPL) ? ((edmask&ED_M68)?'Y':'y') : 'z'; /* set branch type operand */
exp_ptr = EXP1.stack;
if ( EXP1.ptr == 1 && exp_ptr->expr_code == EXPR_VALUE )
{
long max_dist;
max_dist = (opc->op_amode & SPL) ? 32767 : 127;
if ( exp_ptr->expr_value < -(max_dist + 1) || exp_ptr->expr_value > max_dist )
{
long toofar;
toofar = exp_ptr->expr_value;
if ( toofar > 0 )
{
toofar -= max_dist;
}
else
{
toofar = -toofar - (max_dist + 1);
}
sprintf(emsg, "Branch offset 0x%lX byte(s) out of range", toofar);
bad_token((char *)0, emsg);
exp_ptr->expr_value = -offset;
}
}
else
{
EXP1.psuedo_value = 0;
}
return;
}
static int do_operand(Opcode *opc)
{ /* 1 or 2 operands required*/
AModes amdcdnum = ILL_NUM;
int ct;
int j = 0;
int temp = 0;
long amflag = 0;
int z_page = 0; /* zero page */
long con_offset = 0; /* constant offset */
int indexed_mode = 0x00; /* holds current mode flags */
/* mode flags */
int flg_1decr = 0x001; /* one minus sign - decrement by one */
int flg_2decr = 0x002; /* two minus signs - decrement by two */
int flg_5bit = 0x004; /* 5 bit constant offset */
int flg_8bit = 0x008; /* 8 bit constant offset */
int flg_16bit = 0x010; /* 16 bit constant offset */
int flg_indirect = 0x020; /* indirect - @(r) */
int flg_PC = 0x040; /* offset from Program Counter */
int flg_ABD = 0x080; /* Accumulator offset */
int flg_neg = 0x000;
/* indexed/indirect register flags */
int ireg_X = 0x0;
int ireg_Y = 0x1;
int ireg_U = 0x2;
int ireg_S = 0x3;
/* register flags */
int reg_D = 0x0; /* double accumulator D (A & B) - 16bit register */
int reg_X = 0x1; /* index register X - 16bit register */
int reg_Y = 0x2; /* index register Y - 16bit register */
int reg_U = 0x3; /* user stack pointer - 16bit register */
int reg_S = 0x4; /* hardware stack pointer - 16bit register */
int reg_PC = 0x5; /* Program Counter PC - 16bit register */
int reg_A = 0x8; /* accumulator A - 8bit register */
int reg_B = 0x9; /* accumulator B - 8bit register */
int reg_CCR = 0xA; /* condition code register - 8bit register */
int reg_DPR = 0xB; /* direct page register - 8bit register */
ct = get_token(); /* pickup the next token */
switch (ct)
{
case EOL:
{
return -1; /* no operand supplied */
}
case TOKEN_oper:
{
if ( token_value == '-' )
{
flg_neg = 1;
if ( (token_value == '-') && (*inp_ptr == open_operand) && (*(inp_ptr + 2) == close_operand) )
{
indexed_mode++; /* Set one minus sign */
flg_neg = 0;
inp_ptr++; /* eat the open_operand */
}
else if ( (token_value == '-') && (*inp_ptr == '-') && (*(inp_ptr + 1) == open_operand) && (*(inp_ptr + 3) == close_operand) )
{
indexed_mode++;
indexed_mode++; /* Set two minus sign */
flg_neg = 0;
inp_ptr++; /* eat the 2nd '-' */
inp_ptr++; /* eat the open_operand */
}
else
{
inp_ptr--; /* backup to the minus sign */
}
}
else
{
inp_ptr--; /* backup to the minus sign */
}
}
case TOKEN_pcx:
{
if ( token_value == '#' )
{
get_token(); /* get the next token */
if ( exprs(1, &EXP1) < 1 )
break; /* quit if expr nfg */
/* If it is a 2 BYTE immediate mode address */
if ( (opc->op_amode & SPC) == SPC )
{
EXP1.tag = (edmask & ED_M68) ? 'W' : 'w';
}
return I_NUM; /* return with immediate mode address */
}
if ( token_value == open_operand )
{
amflag = FIN;
}
else
{
if ( token_value == '@' )
{
indexed_mode = (indexed_mode | flg_indirect);
if ( *inp_ptr == open_operand )
{
amflag = FIN;
inp_ptr++; /* eat the open_operand */
}
else if ( *inp_ptr != '-' )
{
amflag = OPENAT;
}
else
{
if ( *inp_ptr == '-' )
{
flg_neg = 1;
}
if ( (*inp_ptr == '-') && (*(inp_ptr + 1) == open_operand) && (*(inp_ptr + 3) == close_operand) )
{
indexed_mode++; /* Set one minus sign */
flg_neg = 0;
inp_ptr++; /* eat the minus sign */
inp_ptr++; /* eat the open_operand */
}
else if ( (*inp_ptr == '-') && (*(inp_ptr + 1) == '-') && (*(inp_ptr + 2) == open_operand) && (*(inp_ptr + 4) == close_operand) )
{
indexed_mode++;
indexed_mode++; /* Set two minus sign */
flg_neg = 0;
inp_ptr++; /* eat the minus sign */
inp_ptr++; /* eat the 2nd '-' */
inp_ptr++; /* eat the open_operand */
}
}
}
}
if ( ((indexed_mode & flg_1decr) || (indexed_mode & flg_2decr)) && (flg_neg == 0) )
{ /* ----> Start of -(r), --(r), @-(r), and @--(r) opcodes */
if ( indexed_mode & flg_1decr )
{
if ( indexed_mode & flg_indirect )
{
temp = 0x93; /* decrement by one (0x92) not allowed in indirect mode - so dec. by two (0x93)*/
}
else
{
temp = 0x82;
}
}
if ( indexed_mode & flg_2decr )
{
if ( indexed_mode & flg_indirect )
{
temp = 0x93;
}
else
{
temp = 0x83;
}
}
/* Convert to Upper Case */
j = toupper(*inp_ptr);
if ( j == 'X' )
{
temp = (temp | (ireg_X << 5));
}
else if ( j == 'Y' )
{
temp = (temp | (ireg_Y << 5));
}
else if ( j == 'U' )
{
temp = (temp | (ireg_U << 5));
}
else if ( j == 'S' )
{
temp = (temp | (ireg_S << 5));
}
++inp_ptr; /* eat the reg */
++inp_ptr; /* eat the close_operand */
EXP0SP->expr_value = opc->op_value + 0x20;
EXP1.psuedo_value = EXP1SP->expr_value = temp; /* set operand value */
EXP1SP->expr_code = EXPR_VALUE; /* set expression component is an absolute value */
EXP1.tag = 'b';
EXP1.ptr = 1; /* second stack has operand (1 element) */
return I_NUM;
} /* <---- End of -(r), --(r), @-(r), and @--(r) opcodes */
get_token(); /* pickup the next token */
} /* fall through to rest */
default:
{
tmp_ptr = inp_ptr;
j = 0;
while ( !(cttbl[(int)*inp_ptr] & (CT_EOL | CT_SMC)) )
{
if ( (*inp_ptr == '(') && ((*(inp_ptr + 2) == ')') || (*(inp_ptr + 3) == ')')) )
{
j = 1;
break;
}
inp_ptr++;
}
inp_ptr = tmp_ptr;
if ( token_type == TOKEN_strng )
{
/* ----> Start of PSHS, PSHU, PULS and PULU opcodes */
/* There is a better way to do this, but for now it's down and dirty */
if ( (opc->op_value == 0x34) || (opc->op_value == 0x35) || (opc->op_value == 0x36) || (opc->op_value == 0x37) )
{
temp = 0;
while ( 1 )
{
/* Convert to Upper Case */
j = 0;
while ( token_pool[j] )
{
token_pool[j] = toupper(token_pool[j]);
++j;
}
/* Find - Reg */
if ( strcmp(token_pool, "CCR") == 0 )
{
temp = (temp | 1);
}
if ( strcmp(token_pool, "A") == 0 )
{
temp = (temp | (1 << 1));
}
if ( strcmp(token_pool, "B") == 0 )
{
temp = (temp | (1 << 2));
}
if ( strcmp(token_pool, "D") == 0 )
{
temp = (temp | (1 << 1));
temp = (temp | (1 << 2));
}
if ( strcmp(token_pool, "DPR") == 0 )
{
temp = (temp | (1 << 3));
}
if ( strcmp(token_pool, "X") == 0 )
{
temp = (temp | (1 << 4));
}
if ( strcmp(token_pool, "Y") == 0 )
{
temp = (temp | (1 << 5));
}
if ( strcmp(token_pool, "S") == 0 )
{
temp = (temp | (1 << 6));
}
if ( strcmp(token_pool, "U") == 0 )
{
temp = (temp | (1 << 6));
}
if ( strcmp(token_pool, "PC") == 0 )
{
temp = (temp | (1 << 7));
}
if ( *inp_ptr == ',' )
{
inp_ptr++;
get_token(); /* pickup the next token */
}
else
{
break;
}
}
EXP1.psuedo_value = EXP1SP->expr_value = temp; /* set operand value */
EXP1SP->expr_code = EXPR_VALUE; /* set expression component is an absolute value */
EXP1.tag = 'b';
EXP1.ptr = 1; /* second stack has operand (1 element) */
return I_NUM;
} /* <---- End of PSHS, PSHU, PULS and PULU opcodes */
}
if ( (token_type == TOKEN_numb) && (*inp_ptr == open_operand) )
{
if ( (token_value == 0) && (*inp_ptr == open_operand) && (*(inp_ptr + 2) == close_operand) )
{ /* optimize: if 0(r), 0(r)+, 0(r)++, @0(r), @0(r)+, @0(r)++ */
/* convert to (r), (r)+, (r)++, @(r), @(r)+, @(r)++ */
amflag = FIN;
inp_ptr++; /* eat the open_operand */
get_token(); /* pickup the next token */
}
}
if ( amflag == FIN )
{ /* ----> Start of (r), (r)+, (r)++, @(r), @(r)+, @(r)++ */
/* Convert to Upper Case */
j = 0;
while ( token_pool[j] )
{
token_pool[j] = toupper(token_pool[j]);
++j;
}
if ( *inp_ptr == close_operand )
{
++inp_ptr; /* eat the close_operand */
if ( (*inp_ptr == '+') && (*(inp_ptr + 1) == '+') )
{
if ( indexed_mode & flg_indirect )
{
temp = 0x91;
}
else
{
temp = 0x81;
}
++inp_ptr; /* eat the 1st '+' */
++inp_ptr; /* eat the 2nd '+' */
}
else if ( *inp_ptr == '+' )
{
if ( indexed_mode & flg_indirect )
{
temp = 0x91; /* increment by one (0x90) not allowed in indirect mode */
} /* use increment by two (0x91) */
else
{
temp = 0x80;
}
++inp_ptr; /* eat the '+' */
}
else
{
if ( indexed_mode & flg_indirect ) /* No offset */
{
temp = 0x94;
}
else
{
temp = 0x84;
}
}
if ( strcmp(token_pool, "X") == 0 )
{
temp = (temp | (ireg_X << 5));
}
else if ( strcmp(token_pool, "Y") == 0 )
{
temp = (temp | (ireg_Y << 5));
}
else if ( strcmp(token_pool, "U") == 0 )
{
temp = (temp | (ireg_U << 5));
}
else if ( strcmp(token_pool, "S") == 0 )
{
temp = (temp | (ireg_S << 5));
}
EXP0SP->expr_value = opc->op_value + 0x20;
EXP1.psuedo_value = EXP1SP->expr_value = temp; /* set operand value */
EXP1SP->expr_code = EXPR_VALUE; /* set expression component is an absolute value */
EXP1.tag = 'b';
EXP1.ptr = 1; /* second stack has operand (1 element) */
return I_NUM;
}
sprintf(emsg, "using amflag = FIN error - amflag value = %lX Hex", amflag);
bad_token((char *)0, emsg);
f1_eatit(); /* eat rest of line */
return -1;
} /* <---- End of (r), (r)+, (r)++, @(r), @(r)+, @(r)++ */
if ( (((token_type == TOKEN_strng) || (token_type == TOKEN_numb)) && ((*inp_ptr == open_operand) || (j) || (amflag == OPENAT))) || ((token_type == TOKEN_oper) && (j)) )
{ /* ----> Start of (r) or n(r) or nnnn(r) or @(r) or @n(r) or @nnnn(r) */
if ( j )
{
if ( token_type != TOKEN_oper )
{
if ( strcmp(token_pool, "A") == 0 )
{
indexed_mode = indexed_mode | flg_ABD;
if ( indexed_mode & flg_indirect )
{
temp = 0x96;
}
else
{
temp = 0x86;
}
}
else if ( strcmp(token_pool, "B") == 0 )
{
indexed_mode = indexed_mode | flg_ABD;
if ( indexed_mode & flg_indirect )
{
temp = 0x95;
}
else
{
temp = 0x85;
}
}
else if ( strcmp(token_pool, "D") == 0 )
{
indexed_mode = indexed_mode | flg_ABD;
if ( indexed_mode & flg_indirect )
{
temp = 0x9B;
}
else
{
temp = 0x8B;
}
}
}
if ( (indexed_mode & flg_ABD) == 0 )
{ /* if not ABD flag do this */
if ( exprs(1, &EXP2) < 1 )
{ /* test operand */
sprintf(emsg, "unknown operand ");
bad_token((char *)0, emsg);
f1_eatit(); /* eat rest of line */
return -1;
}
con_offset = EXP2SP->expr_value;
if ( (EXP2SP->expr_code != EXPR_VALUE) || (EXP2.ptr > 1) ||
( ( (getAMATag(current_fnd)) >= 0) && (pass !=0) ) )
{ /* if unknown value in pass 0 then pass 1 must treat it as unknown */
/* if unknown value - treat as 8bit or 16bit mode */
/* check all symbols of an expression for base page */
z_page = 0x1; /* set z_page true */
temp = 0; /* set ABS component to byte */
for(j=0; j<EXP2.ptr; j++)
{ /* Search through the expression for symbols and ABS values */
if((EXP2SP[j].expr_code) == EXPR_SYM)
{ /* if any symbol not base page set z_page false */
z_page = z_page & (EXP2SP[j].expr_sym->flg_base);
}
if((EXP2SP[j].expr_code) == EXPR_VALUE)
{ /* if ABS component goes over 255 set z_page false */
temp = temp + EXP2SP[j].expr_value;
if (temp > 0xFF) z_page = 0; /* set 16 bit mode */
}
}
z_page = z_page & (EXP2.base_page_reference); /* check for base page */
if ( z_page )
{
indexed_mode = indexed_mode | flg_8bit; /* Really seven bit with negative flag */
if ( indexed_mode & flg_indirect )
{
temp = 0x98;
}
else
{
temp = 0x88;
}
}
else
{
indexed_mode = indexed_mode | flg_16bit; /* Really fifteen bit with negative flag */
if ( indexed_mode & flg_indirect )
{
temp = 0x99;
}
else
{
temp = 0x89;
}
}
if ( !pass) /* Tell pass 1 that pass 0 chose an unknown for this instruction*/
{
setAMATag(current_fnd,1);
}
}
else
{ /* if absolute value */
if ( ((con_offset > -17) && (con_offset < 16)) && (!(indexed_mode & flg_indirect)) )
{ /* -17 >< +16 */
indexed_mode = indexed_mode | flg_5bit; /* Really four bit with negative flag */
if ( indexed_mode & flg_indirect )
{
temp = 0x98; /* Force 8 bits for @n(r) */
indexed_mode = (indexed_mode & ~flg_5bit) | flg_8bit;
}
else
{
temp = 0x0;
}
}
else if ( (con_offset > -129) && (con_offset < 128) )
{ /* -129 >< +128 */
indexed_mode = indexed_mode | flg_8bit; /* Really seven bit with negative flag */
if ( indexed_mode & flg_indirect )
{
temp = 0x98;
}
else
{
temp = 0x88;
}
}
else if ( (con_offset > -32769) && (con_offset < 65536) )
{ /* -32769 >< +32768 or Load Effective Address instruction - Note: In 16 bit math any number
between 0xFFFF -> 0x8000 is -1 -> -32768 so must be allowed +32768 + 0x8000 = 65536 */
indexed_mode = indexed_mode | flg_16bit;
if ( indexed_mode & flg_indirect )
{
temp = 0x99;
}
else
{
temp = 0x89;
}
}
else
{
sprintf(emsg, "Only signed 16 bit values allowed - constant offset = %lX Hex", con_offset);
bad_token((char *)0, emsg);
f1_eatit(); /* eat rest of line */
return -1;
}
/* offset is now an absolute variable so it might have a value of zero */
/* If zero offset - set 0(r), @0(r) to (r), @(r) 5bit mode */
if (con_offset == 0)
{
if ( indexed_mode & flg_indirect )
{
temp = 0x94;
}
else
{
temp = 0x84;
}
/* Force 0(r), @0(r) to (r), @(r) */
indexed_mode = ((indexed_mode & ~flg_8bit & ~flg_16bit) | flg_5bit);
}
}
}
if ( *inp_ptr == open_operand )
{
++inp_ptr; /* eat the open_operand */
get_token(); /* pickup the next token */
}
else
{
get_token();
}
/* Convert to Upper Case */
j = 0;
while ( token_pool[j] )
{
token_pool[j] = toupper(token_pool[j]);
++j;
}
if ( *inp_ptr == close_operand )
{
++inp_ptr; /* eat the close_operand */
}
if ( strcmp(token_pool, "X") == 0 )
{
temp = temp | (ireg_X << 5);
}
else if ( strcmp(token_pool, "Y") == 0 )
{
temp = temp | (ireg_Y << 5);
}
else if ( strcmp(token_pool, "U") == 0 )
{
temp = temp | (ireg_U << 5);