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asm6809.c
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asm6809.c
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/* 6800 Assembler
* Copyright
* (C) 2011 Joseph H. Allen
*
* This 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 1, or (at your option) any later version.
*
* It 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 software; see the file COPYING. If not, write to the Free Software Foundation,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "asm6800.h"
#include "utils.h"
unsigned short pseudo_dp; /* Address of direct page */
/* Fixup types */
enum {
FIXUP_EXT, /* An extended address */
FIXUP_DIR, /* An 8-bit address */
FIXUP_REL, /* A branch offset */
FIXUP_LREL, /* A branch offset */
FIXUP_IMM8, /* An 8-bit value, not necessarily an address */
FIXUP_IMM16, /* A 16-bit value, not necessarily an address */
FIXUP_IDX8, /* An 8-bit signed index */
FIXUP_UIDX8, /* An 8-bit unsigned inded */
FIXUP_IDX16, /* A 16-bit signed index */
};
/* A pending fixup */
struct fixup {
struct fixup *next;
unsigned short fixup; /* Address of data which needs to be fixed up */
int type; /* Type of fixup */
int ofst;
};
/* Symbol table */
struct symbol {
struct symbol *next;
char *name; /* Name of symbol */
int valid; /* Set if symbol's value is known */
int val; /* Value of symbol */
struct fixup *fixups; /* Fixups waiting for this symbol */
} *symbols;
struct symbol *find_symbol(char *name)
{
struct symbol *sy;
for (sy = symbols; sy; sy = sy->next)
if (!strcmp(sy->name, name))
return sy;
sy = (struct symbol *)malloc(sizeof(struct symbol));
sy->next = symbols;
symbols = sy;
sy->name = strdup(name);
sy->valid = 0;
sy->val = 0;
sy->fixups = 0;
return sy;
}
/* Get symbol name by address */
char *find_label(unsigned short val)
{
struct symbol *sy;
for (sy = symbols; sy; sy = sy->next)
if (sy->val == val)
return sy->name;
return 0;
}
/* Add a fixup */
void add_fixup(struct symbol *sy, unsigned short addr, int type, int ofst)
{
struct fixup *fix = (struct fixup *)malloc(sizeof(struct fixup));
fix->type = type;
fix->fixup = addr;
fix->next = sy->fixups;
fix->ofst = ofst;
sy->fixups = fix;
}
/* Show symbol table */
void show_syms(FILE *f)
{
struct symbol *sy;
for (sy = symbols; sy; sy = sy->next) {
struct fixup *fix;
if (sy->valid) {
fprintf(f,"%4.4X %s\n", sy->val, sy->name);
} else {
fprintf(f,"???? %s\n", sy->name);
}
for (fix = sy->fixups; fix; fix = fix->next) {
if (fix->type == FIXUP_EXT)
fprintf(f," 16-bit address fixup at %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_DIR)
fprintf(f," 8-bit address fixup at %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_REL)
fprintf(f," 8-bit rel fixup %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_LREL)
fprintf(f," 16-bit rel fixup %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_IMM8)
fprintf(f," 8-bit fixup at %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_IMM16)
fprintf(f," 16-bit fixup at %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_IDX8)
fprintf(f," 8-bit index fixup at %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_UIDX8)
fprintf(f," 8-bit index fixup at %4.4X\n", fix->fixup);
else if (fix->type == FIXUP_IDX16)
fprintf(f," 16-bit index fixup at %4.4X\n", fix->fixup);
}
}
}
/* Clear symbol table */
void clr_syms(void)
{
struct symbol *sy;
while ((sy = symbols)) {
struct fixup *fix;
symbols = sy->next;
while ((fix = sy->fixups)) {
sy->fixups = fix->next;
free(fix);
}
free(sy->name);
free(sy);
}
}
/* Insert value into instruction */
int insert_val(unsigned char *mem, unsigned short addr, int type, int val, int ofst, int show)
{
int v = val + ofst;
if (type == FIXUP_EXT) {
if (v >= 0 && v < 65536) {
mem[addr] = (v >> 8);
mem[addr + 1] = v;
if (show) printf("Address at %4.4X set to %4.4X\n", addr, v);
} else {
printf("Error: Address for %4.4x out of range. It was %d but must be 0 - 65535\n", addr, v);
return -1;
}
} else if (type == FIXUP_DIR) {
if (v >= 0 && v < 256) {
mem[addr] = v;
if (show) printf("Byte at %4.4X set to %2.2X\n", addr, v);
} else {
printf("Error: Direct address for %4.4x out of range. It was %4.4x but must be 0x00 - 0xFF\n", addr, v);
return -1;
}
} else if (type == FIXUP_REL) {
if (v >= 0 && v < 65536) {
v -= addr + 1;
if (v >= -128 && v < 128) {
mem[addr] = v;
if (show) printf("Offset at %4.4X set to %2.2X\n", addr, 255 & v);
} else {
printf("Error: Offset for %4.4x out of range. It was %d but must be -128 to 127\n", addr, v);
return -1;
}
} else {
printf("Error: Address for %4.4x out of range. It was %d but must be 0 - 65535\n", addr, v);
return -1;
}
} else if (type == FIXUP_LREL) {
if (v >= 0 && v < 65536) {
v -= addr + 2;
mem[addr] = (v >> 8);
mem[addr + 1] = v;
if (show) printf("Offset at %4.4X set to %4.4X\n", addr, 65535 & v);
} else {
printf("Error: Address for %4.4x out of range. It was %d but must be 0 - 65535\n", addr, v);
return -1;
}
} else if (type == FIXUP_IMM8) {
if (v >= -128 && v < 256) {
mem[addr] = v;
if (show) printf("Byte at %4.4X set to %2.2X\n", addr, 255 & v);
} else {
printf("Error: Byte for %4.4x out of range. It was %d but must be -128 to 255\n", addr, v);
return -1;
}
} else if (type == FIXUP_IMM16) {
if (v >= -32768 && v < 65536) {
mem[addr] = (v >> 8);
mem[addr + 1] = v;
if (show) printf("Word at %4.4X set to %4.4X\n", addr, 65535 & v);
} else {
printf("Error: Word for %4.4x out of range. It was %d but must be -32768 to 65535\n", addr, v);
return -1;
}
} else if (type == FIXUP_IDX8) {
if (v >= -128 && v < 128) {
mem[addr] = v;
if (show) printf("Index at %4.4X set to %2.2X\n", addr, 255 & v);
} else {
printf("Error: Index for %4.4x out of range. It was %d but must be -128 to 127\n", addr, v);
return -1;
}
} else if (type == FIXUP_UIDX8) {
if (v >= 0 && v < 256) {
mem[addr] = v;
if (show) printf("Index at %4.4X set to %2.2X\n", addr, 255 & v);
} else {
printf("Error: Index for %4.4x out of range. It was %d but must be 0 to 255\n", addr, v);
return -1;
}
} else if (type == FIXUP_IDX16) {
if (v >= -65535 && v < 65536) {
mem[addr] = (v >> 8);
mem[addr + 1] = v;
if (show) printf("Index at %4.4X set to %4.4X\n", addr, 65535 & v);
} else {
printf("Error: Index for %4.4x out of range. It was %d but must be -65535 to 65535\n", addr, v);
return -1;
}
}
return 0;
}
/* Set symbol's value, process pending fixups */
void set_symbol(unsigned char *mem, struct symbol *sy, int val)
{
struct fixup *fix;
if (!sy)
return;
if (sy->valid) {
printf("Symbol '%s' already defined to %4.4x\n", sy->name, sy->val);
return;
}
sy->valid = 1;
sy->val = val;
while ((fix = sy->fixups)) {
sy->fixups = fix->next;
insert_val(mem, fix->fixup, fix->type, val, fix->ofst, 1);
free(fix);
}
}
/* Insert value or add fixup if symbol not yet defined */
int insert_or_add(unsigned char *mem, unsigned short addr, int type, struct symbol *sy, int val, int show)
{
if (sy) {
/* Set it later */
printf("later = %x\n", addr);
add_fixup(sy, addr, type, val);
mem[addr] = 0;
if (type == FIXUP_EXT || type == FIXUP_LREL || type == FIXUP_IMM16 || type == FIXUP_IDX16)
mem[addr + 1] = 0;
return 0;
} else {
/* Set it now */
return insert_val(mem, addr, type, val, 0, show);
}
}
/* Instruction type codes */
enum {
LREL=1, /* Long branch, 16-bit offset */
REL=2, /* Relative branch, 8-bit offset */
IMM8=3,
IMM16=4,
TFR=5,
IND=6, /* Indexed */
SLIST=7,
ULIST=8,
DIR=9, /* Direct */
EXT=10, /* Extended */
FCB=11, /* FCB pseudo-op */
FDB=12, /* FDB pseudo-op */
EQU=13, /* EQU pseudo-op */
RMB=14, /* RMB pseudo-op */
ORG=15, /* ORG pseudo-op */
IGN=16, /* Ignore these pseudo-ops */
NONE=17, /* No operand */
SETDP=18 /* setdp pseudo-op */
};
struct variant
{
unsigned short opcode;
short type;
};
#define VARIANT_COUNT 4
struct insn
{
char *insn;
struct variant variant[VARIANT_COUNT];
} table[] =
{
{ "nop", { { 0x12, NONE } } },
{ "sync", { { 0x13, NONE } } },
{ "lbra", { { 0x16, LREL } } },
{ "lbsr", { { 0x17, LREL } } },
{ "daa", { { 0x19, NONE } } },
{ "orcc", { { 0x1A, IMM8 } } },
{ "andcc", { { 0x1C, IMM8 } } },
{ "sex", { { 0x1D, NONE } } },
{ "exg", { { 0x1E, TFR } } },
{ "tfr", { { 0x1F, TFR } } },
{ "bra", { { 0x20, REL } } },
{ "brn", { { 0x21, REL } } },
{ "bhi", { { 0x22, REL } } },
{ "bls", { { 0x23, REL } } },
{ "bcc", { { 0x24, REL } } },
{ "bhs", { { 0x24, REL } } },
{ "bcs", { { 0x25, REL } } },
{ "blo", { { 0x25, REL } } },
{ "bne", { { 0x26, REL } } },
{ "beq", { { 0x27, REL } } },
{ "bvc", { { 0x28, REL } } },
{ "bvs", { { 0x29, REL } } },
{ "bpl", { { 0x2a, REL } } },
{ "bmi", { { 0x2b, REL } } },
{ "bge", { { 0x2c, REL } } },
{ "blt", { { 0x2d, REL } } },
{ "bgt", { { 0x2e, REL } } },
{ "ble", { { 0x2f, REL } } },
/* { "lbra", { { 0x1020, LREL } }, Use shorter version, opcode=0x16 */
{ "lbrn", { { 0x1021, LREL } } },
{ "lbhi", { { 0x1022, LREL } } },
{ "lbls", { { 0x1023, LREL } } },
{ "lbcc", { { 0x1024, LREL } } },
{ "lbhs", { { 0x1024, LREL } } },
{ "lbcs", { { 0x1025, LREL } } },
{ "lblo", { { 0x1025, LREL } } },
{ "lbne", { { 0x1026, LREL } } },
{ "lbeq", { { 0x1027, LREL } } },
{ "lbvc", { { 0x1028, LREL } } },
{ "lbvs", { { 0x1029, LREL } } },
{ "lbpl", { { 0x102a, LREL } } },
{ "lbmi", { { 0x102b, LREL } } },
{ "lbge", { { 0x102c, LREL } } },
{ "lblt", { { 0x102d, LREL } } },
{ "lbgt", { { 0x102e, LREL } } },
{ "lble", { { 0x102f, LREL } } },
{ "leax", { { 0x30, IND } } },
{ "leay", { { 0x31, IND } } },
{ "leas", { { 0x32, IND } } },
{ "leau", { { 0x33, IND } } },
{ "pshs", { { 0x34, SLIST } } },
{ "puls", { { 0x35, SLIST } } },
{ "pshu", { { 0x36, ULIST } } },
{ "pulu", { { 0x37, ULIST } } },
{ "rts", { { 0x39, NONE } } },
{ "abx", { { 0x3A, NONE } } },
{ "rti", { { 0x3B, NONE } } },
{ "cwai", { { 0x3C, IMM8 } } },
{ "mul", { { 0x3D, NONE } } },
{ "swi", { { 0x3F, NONE } } },
{ "swi2", { { 0x103F, NONE } } },
{ "swi3", { { 0x113F, NONE } } },
{ "nega", { { 0x40, NONE } } },
{ "negb", { { 0x50, NONE } } },
{ "neg", { { 0x60, IND }, { 0x00, DIR }, { 0x70, EXT } } },
{ "coma", { { 0x43, NONE } } },
{ "comb", { { 0x53, NONE } } },
{ "com", { { 0x63, IND }, { 0x03, DIR }, { 0x73, EXT } } },
{ "lsra", { { 0x44, NONE } } },
{ "lsrb", { { 0x54, NONE } } },
{ "lsr", { { 0x64, IND }, { 0x04, DIR }, { 0x74, EXT } } },
{ "rora", { { 0x46, NONE } } },
{ "rorb", { { 0x56, NONE } } },
{ "ror", { { 0x66, IND }, { 0x06, DIR }, { 0x76, EXT } } },
{ "asra", { { 0x47, NONE } } },
{ "asrb", { { 0x57, NONE } } },
{ "asr", { { 0x67, IND }, { 0x07, DIR }, { 0x77, EXT } } },
{ "asla", { { 0x48, NONE } } },
{ "aslb", { { 0x58, NONE } } },
{ "asl", { { 0x68, IND }, { 0x08, DIR }, { 0x78, EXT } } },
{ "lsla", { { 0x48, NONE } } },
{ "lslb", { { 0x58, NONE } } },
{ "lsl", { { 0x68, IND }, { 0x08, DIR }, { 0x78, EXT } } },
{ "rola", { { 0x49, NONE } } },
{ "rolb", { { 0x59, NONE } } },
{ "rol", { { 0x69, IND }, { 0x09, DIR }, { 0x79, EXT } } },
{ "deca", { { 0x4A, NONE } } },
{ "decb", { { 0x5A, NONE } } },
{ "dec", { { 0x6A, IND }, { 0x0A, DIR }, { 0x7A, EXT } } },
{ "inca", { { 0x4C, NONE } } },
{ "incb", { { 0x5C, NONE } } },
{ "inc", { { 0x6C, IND }, { 0x0C, DIR }, { 0x7C, EXT } } },
{ "tsta", { { 0x4D, NONE } } },
{ "tstb", { { 0x5D, NONE } } },
{ "tst", { { 0x6D, IND }, { 0x0D, DIR }, { 0x7D, EXT } } },
{ "jmp", { { 0x6E, IND }, { 0x0E, DIR }, { 0x7E, EXT } } },
{ "clra", { { 0x4F, NONE } } },
{ "clrb", { { 0x5F, NONE } } },
{ "clr", { { 0x6F, IND }, { 0x0F, DIR }, { 0x7F, EXT } } },
{ "suba", { { 0x80, IMM8 }, { 0xA0, IND }, { 0x90, DIR }, { 0xB0, EXT } } },
{ "subb", { { 0xC0, IMM8 }, { 0xE0, IND }, { 0xD0, DIR }, { 0xF0, EXT } } },
{ "cmpa", { { 0x81, IMM8 }, { 0xA1, IND }, { 0x91, DIR }, { 0xB1, EXT } } },
{ "cmpb", { { 0xC1, IMM8 }, { 0xE1, IND }, { 0xD1, DIR }, { 0xF1, EXT } } },
{ "sbca", { { 0x82, IMM8 }, { 0xA2, IND }, { 0x92, DIR }, { 0xB2, EXT } } },
{ "sbcb", { { 0xC2, IMM8 }, { 0xE2, IND }, { 0xD2, DIR }, { 0xF2, EXT } } },
{ "subd", { { 0x83, IMM16 }, { 0xA3, IND }, { 0x93, DIR }, { 0xB3, EXT } } },
{ "cmpd", { { 0x1083, IMM16 }, { 0x10A3, IND }, { 0x1093, DIR }, { 0x10B3, EXT } } },
{ "cmpu", { { 0x1183, IMM16 }, { 0x11A3, IND }, { 0x1193, DIR }, { 0x11B3, EXT } } },
{ "addd", { { 0xC3, IMM16 }, { 0xE3, IND }, { 0xD3, DIR }, { 0xF3, EXT } } },
{ "anda", { { 0x84, IMM8 }, { 0xA4, IND }, { 0x94, DIR }, { 0xB4, EXT } } },
{ "andb", { { 0xC4, IMM8 }, { 0xE4, IND }, { 0xD4, DIR }, { 0xF4, EXT } } },
{ "bita", { { 0x85, IMM8 }, { 0xA5, IND }, { 0x95, DIR }, { 0xB5, EXT } } },
{ "bitb", { { 0xC5, IMM8 }, { 0xE5, IND }, { 0xD5, DIR }, { 0xF5, EXT } } },
{ "lda", { { 0x86, IMM8 }, { 0xA6, IND }, { 0x96, DIR }, { 0xB6, EXT } } },
{ "ldb", { { 0xC6, IMM8 }, { 0xE6, IND }, { 0xD6, DIR }, { 0xF6, EXT } } },
{ "sta", { { 0xA7, IND }, { 0x97, DIR }, { 0xB7, EXT } } },
{ "stb", { { 0xE7, IND }, { 0xD7, DIR }, { 0xF7, EXT } } },
{ "eora", { { 0x88, IMM8 }, { 0xA8, IND }, { 0x98, DIR }, { 0xB8, EXT } } },
{ "eorb", { { 0xC8, IMM8 }, { 0xE8, IND }, { 0xD8, DIR }, { 0xF8, EXT } } },
{ "adca", { { 0x89, IMM8 }, { 0xA9, IND }, { 0x99, DIR }, { 0xB9, EXT } } },
{ "adcb", { { 0xC9, IMM8 }, { 0xE9, IND }, { 0xD9, DIR }, { 0xF9, EXT } } },
{ "ora", { { 0x8A, IMM8 }, { 0xAA, IND }, { 0x9A, DIR }, { 0xBA, EXT } } },
{ "orb", { { 0xCA, IMM8 }, { 0xEA, IND }, { 0xDA, DIR }, { 0xFA, EXT } } },
{ "adda", { { 0x8B, IMM8 }, { 0xAB, IND }, { 0x9B, DIR }, { 0xBB, EXT } } },
{ "addb", { { 0xCB, IMM8 }, { 0xEB, IND }, { 0xDB, DIR }, { 0xFB, EXT } } },
{ "cmpx", { { 0x8C, IMM16 }, { 0xAC, IND }, { 0x9C, DIR }, { 0xBC, EXT } } },
{ "cmpy", { { 0x108C, IMM16 }, { 0x10AC, IND }, { 0x109C, DIR }, { 0x10BC, EXT } } },
{ "cmps", { { 0x118C, IMM16 }, { 0x11AC, IND }, { 0x119C, DIR }, { 0x11BC, EXT } } },
{ "ldd", { { 0xCC, IMM16 }, { 0xEC, IND }, { 0xDC, DIR }, { 0xFC, EXT } } },
{ "bsr", { { 0x8D, REL } } },
{ "jsr", { { 0xAD, IND }, { 0x9D, DIR }, { 0xBD, EXT } } },
{ "std", { { 0xED, IND }, { 0xDD, DIR }, { 0xFD, EXT } } },
{ "ldx", { { 0x8E, IMM16 }, { 0xAE, IND }, { 0x9E, DIR }, { 0xBE, EXT } } },
{ "ldy", { { 0x108E, IMM16 }, { 0x10AE, IND }, { 0x109E, DIR }, { 0x10BE, EXT } } },
{ "ldu", { { 0xCE, IMM16 }, { 0xEE, IND }, { 0xDE, DIR }, { 0xFE, EXT } } },
{ "lds", { { 0x10CE, IMM16 }, { 0x10EE, IND }, { 0x10DE, DIR }, { 0x10FE, EXT } } },
{ "stx", { { 0xAF, IND }, { 0x9F, DIR }, { 0xBF, EXT } } },
{ "sty", { { 0x10AF, IND }, { 0x109F, DIR }, { 0x10BF, EXT } } },
{ "stu", { { 0xEF, IND }, { 0xDF, DIR }, { 0xFF, EXT } } },
{ "sts", { { 0x10EF, IND }, { 0x10DF, DIR }, { 0x10FF, EXT } } },
{ "fcb", { { 0, FCB } } },
{ "fcc", { { 0, FCB } } },
{ "fdb", { { 0, FDB } } },
{ "equ", { { 0, EQU } } },
{ "rmb", { { 0, RMB } } },
{ "org", { { 0, ORG } } },
{ "end", { { 0, IGN } } },
{ "mon", { { 0, IGN } } },
{ "opt", { { 0, IGN } } },
{ "nam", { { 0, IGN } } },
{ "ttl", { { 0, IGN } } },
{ "spc", { { 0, IGN } } },
{ "page", { { 0, IGN } } },
{ "setdp", { { 0, SETDP } } },
{ 0, { { 0, 0 } } }
};
/* Parse a value (this should really be an expression parser) */
/* We return the value, or a symbol for an as-yet unknown value */
int parse_val(char **buf, int *operand, struct symbol **sy, unsigned short addr)
{
char str[80];
*sy = 0;
if (!parse_dec(buf, operand)) {
if (parse_ident(buf, str)) {
char *p;
if (!strcmp(str, "*")) {
*operand = addr;
} else {
*sy = find_symbol(str);
*operand = (*sy)->val;
if ((*sy)->valid)
*sy = 0;
}
p = *buf;
if (*p == '+' || *p == '-') {
char c = *p++;
int ofst;
*buf = p;
if (parse_dec(buf, &ofst)) {
if (c == '+')
*operand += ofst;
else
*operand -= ofst;
} else {
printf("Missing value after + or -\n");
}
}
} else {
return 0;
}
}
return 1;
}
int parse_imm(char **buf, int *operand, struct symbol **sy, unsigned short addr)
{
char *p = *buf;
if (*p == '#')
{
++p;
if (parse_val(&p, operand, sy, addr))
{
*buf = p;
return 1;
}
}
return 0;
}
int parse_tfr_nibble(char **buf, unsigned char *at_cb)
{
unsigned char cb = 0;
char *p = *buf;
char c = to_upper(p[0]);
char d = to_upper(p[1]);
if (c == 'D' && d == 'P') { cb = 0x0B; p += 2; }
else if (c == 'C' && d == 'C') { cb = 0x0A; p += 2; }
else if (c == 'D') { cb = 0x00; p += 1; }
else if (c == 'X') { cb = 0x01; p += 1; }
else if (c == 'Y') { cb = 0x02; p += 1; }
else if (c == 'U') { cb = 0x03; p += 1; }
else if (c == 'S') { cb = 0x04; p += 1; }
else if (c == 'P' && d == 'C') { cb = 0x05; p += 2; }
else if (c == 'A') { cb = 0x08; p += 1; }
else if (c == 'B') { cb = 0x09; p += 1; }
else return 0;
*buf = p;
*at_cb = cb;
return 1;
}
int parse_tfr(char **buf, unsigned char *at_cb)
{
unsigned char upper;
unsigned char lower;
char *p = *buf;
if (parse_tfr_nibble(&p, &upper))
{
if (*p == ',')
{
++p;
if (parse_tfr_nibble(&p, &lower))
{
if ((upper < 0x8 && lower < 0x8) || (upper >= 0x8 && lower >= 0x8))
{
*buf = p;
*at_cb = (upper << 4) + lower;
return 1;
}
}
}
}
return 0;
}
int parse_list(char **buf, unsigned char *at_cb, int up)
{
char *p = *buf;
unsigned char cb = 0;
int more;
do {
char c = to_upper(p[0]);
char d = to_upper(p[1]);
more = 0;
if (c == 'C' && d == 'C')
{
cb |= 0x01;
p += 2;
}
else if (c == 'A')
{
cb |= 0x02;
p += 1;
}
else if (c == 'B')
{
cb |= 0x04;
p += 1;
}
else if (c == 'D' && d == 'P')
{
cb |= 0x08;
p += 2;
}
else if (c == 'D')
{
cb |= 0x06;
p += 1;
}
else if (c == 'X')
{
cb |= 0x10;
p += 1;
}
else if (c == 'Y')
{
cb |= 0x20;
p += 1;
}
else if ((!up && c == 'U') || (up && c == 'S'))
{
cb |= 0x40;
p += 1;
}
else if (c == 'P' && d == 'C')
{
cb |= 0x80;
p += 2;
}
else
{
break;
}
if (*p == ',')
{
p += 1;
more = 1;
}
} while (more);
if (cb)
{
*at_cb = cb;
*buf = p;
return 1;
}
return 0;
}
int parse_ireg(char **buf, unsigned char *cb)
{
char *p = *buf;
char c = to_upper(*p);
if (c == 'X')
{
++p;
}
else if (c == 'Y')
{
*cb |= 0x20;
++p;
}
else if (c == 'U')
{
*cb |= 0x40;
++p;
}
else if (c == 'S')
{
*cb |= 0x60;
++p;
}
else
{
return 0;
}
*buf = p;
return 1;
}
int parse_ind(char **buf, unsigned char *at_cb, int *operand, struct symbol **sy, unsigned short addr, int oplen, int *size)
{
char *p = *buf;
int indirect = 0;
int force_small = 0;
int force_large = 0;
unsigned char cb = 0;
*operand = 0;
if (*p == '<')
{
force_small = 1;
++p;
}
else if (*p == '>')
{
force_large = 1;
++p;
}
if (*p == '[')
{
++p;
indirect = 1;
}
*size = 0;
if (to_upper(p[0]) == 'D' && p[1] == ',')
{
cb = 0x8B;
p += 2;
if (!parse_ireg(&p, &cb))
return 0;
}
else if (to_upper(p[0]) == 'A' && p[1] == ',')
{
cb = 0x86;
p += 2;
if (!parse_ireg(&p, &cb))
return 0;
}
else if (to_upper(p[0]) == 'B' && p[1] == ',')
{
cb = 0x85;
p += 2;
if (!parse_ireg(&p, &cb))
return 0;
}
else if (p[0] == ',')
{
++p;
cb = 0x84;
if (p[0] == '-')
{
cb = 0x82;
++p;
if (p[0] == '-')
{
cb = 0x83;
++p;
}
else if (indirect)
{
return 0; /* Not allowed */
}
}
if (!parse_ireg(&p, &cb))
return 0;
if ((cb & 0x8F) == 0x84)
{
if (p[0] == '+')
{
cb = (cb & 0xF0) + 0x00;
++p;
if (p[0] == '+')
{
cb = (cb & 0xF0) + 0x01;
++p;
}
else if (indirect)
{
return 0; /* Not allowed */
}
}
}
}
else if (parse_val(&p, operand, sy, addr))
{
if (*p == ',')
{
++p;
if (to_upper(p[0]) == 'P' && to_upper(p[1]) == 'C' && to_upper(p[2]) == 'R')
{
int target;
p += 3;
/* Try one byte offset */
target = *operand - (addr + oplen + 2);
if (force_small || (!force_large && !*sy && target >= -128 && target < 128))
{
/* It fits in a single byte */
cb = 0x8C;
*size = 1;
*operand = target;
}
else
{
target = *operand - (addr + oplen + 3); /* Account for larger offset */
*operand = target;
cb = 0x8D;
*size = 2;
}
}
else if (parse_ireg(&p, &cb))
{
/* n,X modes */
if (force_large || (!force_small && (*sy || *operand > 127 || *operand < -128)))
{
cb = (cb & 0x60) | 0x89;
*size = 2;
}
else if (force_small || *operand > 15 || *operand < -16 || indirect)
{
cb = (cb & 0x60) | 0x88;
*size = 1;
}
else
{
cb = (cb & 0x60) | (0x1F & *operand);
*size = 0;
}
}
else
{
return 0;
}
}
else if (indirect)
{
/* Extended */
cb = 0x8F;
*size = 2;
}
else
{
/* Not allowed- prefer DIR/EXT */
return 0;
}
}
else
{
return 0;
}
if (indirect)
{
if (*p == ']')
{
++p;
*buf = p;
cb |= 0x10;
*at_cb = cb;
return 1;
}
else
{
return 0;
}
}
else
{
*buf = p;
*at_cb = cb;
return 1;
}
}
void emit_opcode(unsigned char *mem, unsigned short *addr, unsigned short opcode)
{
if (opcode >= 0x100)
{
mem[*addr] = (opcode >> 8);
*addr = *addr + 1;
}
mem[*addr] = opcode;
*addr = *addr + 1;
}
int allow_dir(char **buf)
{
char *p = *buf;
if (*p == '>')
{
return 0;
}
else if (*p =='<')
{
++p;
*buf = p;
return 1;
}
else
{
return 1;
}
}
int allow_ext(char **buf)
{
char *p = *buf;
if (*p == '>')
{
++p;
*buf = p;
return 1;
}
else if (*p =='<')
{
return 0;
}
else
{
return 1;
}
}
unsigned short assemble(unsigned char *mem, unsigned short addr, char *buf)
{
char str[80];
unsigned short org_addr = addr;
unsigned short label_addr = addr;
struct symbol *label_sy;
struct symbol *sy;
struct insn *insn;
int x;
label_sy = 0;
sy = 0;
if (buf[0] == '*' || !buf[0]) {
/* Comment line, ignore */
goto done;
}
if (parse_ident(&buf, str)) {
/* A label */
label_sy = find_symbol(str);
}
if (ws(&buf) && !parse_ident(&buf, str)) {
printf("Error: Missing instruction\n");
goto fail;
}
/* Lookup instruction */
insn = 0;
for (x = 0; table[x].insn; ++x)
if (!jstricmp(table[x].insn, str)) {
insn = &table[x];
break;
}
if (!insn) {
printf("Error: Unknown instruction\n");
goto fail;
}
/* Determine instruction variant based on operand
First one that works wins */
for (x = 0; x != VARIANT_COUNT && insn->variant[x].type; ++x)
{
char *org_buf = buf;
struct variant *ivariant = &insn->variant[x];
switch (ivariant->type)
{
case IGN:
{
goto done;
}
case NONE:
{
emit_opcode(mem, &addr, ivariant->opcode);
goto check;
}
case REL:
{
int operand;
if (ws(&buf) && parse_val(&buf, &operand, &sy, addr))
{
emit_opcode(mem, &addr, ivariant->opcode);
if (insert_or_add(mem, addr, FIXUP_REL, sy, operand, 0))
goto fail;
addr++;
goto check;
}
break;
}
case LREL:
{
int operand;
if (ws(&buf) && parse_val(&buf, &operand, &sy, addr))
{
emit_opcode(mem, &addr, ivariant->opcode);
if (insert_or_add(mem, addr, FIXUP_LREL, sy, operand, 0))
goto fail;
addr += 2;
goto check;
}
break;
}
case IMM8:
{
int operand;
if (ws(&buf) && parse_imm(&buf, &operand, &sy, addr))