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decode.c
8834 lines (7549 loc) · 337 KB
/
decode.c
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#include "flags.h"
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <math.h>
#include "defines.h"
#include "stack.h"
#include "phase_1.h"
#include "parse.h"
#include "printf.h"
#include "main.h"
extern FILE *g_file_out_ptr;
extern char *g_buffer, *unfolded_buffer, g_label[MAX_NAME_LENGTH + 1], *g_include_dir, *g_full_name, *g_tmp;
extern int g_in_enum, g_in_ramsection, g_in_struct, g_macro_id, g_sizeof_g_tmp, g_fail_quetly_on_non_found_functions;
extern int g_ss, g_source_index, g_parsed_int, g_section_status, g_org_defined, g_bankheader_status, g_macro_active;
extern int g_source_file_size, g_input_number_error_msg, g_verbose_level, g_output_format, g_open_files;
extern int g_last_stack_id, g_latest_stack, g_ss, g_commandline_parsing, g_newline_beginning, g_expect_calculations, g_input_parse_special_chars;
extern int g_instruction_n[256], g_instruction_p[256], g_dsp_enable_label_address_conversion;
extern int g_extra_definitions, g_string_size, g_input_float_mode, g_operand_hint, g_operand_hint_type, g_parse_floats;
extern struct instruction g_instructions_table[];
extern struct macro_runtime *g_macro_stack, *g_macro_runtime_current;
extern struct active_file_info *g_active_file_info_first, *g_active_file_info_last, *g_active_file_info_tmp;
#if defined(MCS6502) || defined(WDC65C02) || defined(CSG65CE02) || defined(W65816) || defined(HUC6280) || defined(MC6800) || defined(MC6801) || defined(MC6809)
extern int g_xbit_size, g_accu_size, g_index_size;
#endif
#if defined(W65816)
extern int g_use_wdc_standard;
#endif
#if defined(SPC700)
extern int g_input_number_expects_dot;
#endif
static struct instruction *s_instruction_tmp;
static int s_parser_source_index;
#define IS_THE_MATCH_COMPLETE(x) (s_instruction_tmp->string[x] == 0 && (g_buffer[s_parser_source_index] == 0x0A || g_buffer[s_parser_source_index] == '\\' || (g_buffer[s_parser_source_index] == ' ' && g_buffer[s_parser_source_index+1] == '\\')))
static void _output_assembled_instruction(struct instruction *instruction, const char *format, ...) {
va_list ap;
if (instruction == NULL)
return;
va_start(ap, format);
vfprintf(g_file_out_ptr, format, ap);
#if defined(WLA_DEBUG)
{
char ttt[256];
va_end(ap);
va_start(ap, format);
vsnprintf(ttt, sizeof(ttt), format, ap);
print_text(YES, "LINE %5d: INSTRUCTION: %16s ::: %s\n", g_active_file_info_last->line_current, instruction->string, ttt);
}
#endif
va_end(ap);
}
#if MC6809
static char s_error_no_u[] = "Was expecting register X/Y/S/PC/A/B/CC/DP";
static char s_error_no_s[] = "Was expecting register X/Y/U/PC/A/B/CC/DP";
static int _parse_push_pull_registers(int accept_u) {
int register_byte = 0, reg, y, z, prev_i;
while (1) {
y = g_source_index;
g_source_index = s_parser_source_index;
prev_i = g_source_index;
z = input_number();
s_parser_source_index = g_source_index;
g_source_index = y;
if (z == INPUT_NUMBER_EOL) {
/* roll back to the index before EOL */
s_parser_source_index = prev_i;
break;
}
if (z != INPUT_NUMBER_ADDRESS_LABEL) {
if (accept_u == 1)
print_error(ERROR_ERR, "%s, got something else instead.\n", s_error_no_s);
else
print_error(ERROR_ERR, "%s, got something else instead.\n", s_error_no_u);
return -1;
}
if (strcaselesscmp(g_label, "X") == 0)
reg = 1 << 4;
else if (strcaselesscmp(g_label, "Y") == 0)
reg = 1 << 5;
else if (strcaselesscmp(g_label, "U") == 0) {
if (accept_u == 0) {
print_error(ERROR_ERR, "%s, got \"%s\" instead.\n", s_error_no_u, g_label);
return -1;
}
reg = 1 << 6;
}
else if (strcaselesscmp(g_label, "S") == 0) {
if (accept_u == 1) {
print_error(ERROR_ERR, "%s, got \"%s\" instead.\n", s_error_no_s, g_label);
return -1;
}
reg = 1 << 6;
}
else if (strcaselesscmp(g_label, "PC") == 0)
reg = 1 << 7;
else if (strcaselesscmp(g_label, "A") == 0)
reg = 1 << 1;
else if (strcaselesscmp(g_label, "B") == 0)
reg = 1 << 2;
else if (strcaselesscmp(g_label, "CC") == 0)
reg = 1 << 0;
else if (strcaselesscmp(g_label, "DP") == 0)
reg = 1 << 3;
else {
if (accept_u == 1)
print_error(ERROR_ERR, "%s, got \"%s\" instead.\n", s_error_no_s, g_label);
else
print_error(ERROR_ERR, "%s, got \"%s\" instead.\n", s_error_no_u, g_label);
return -1;
}
if ((register_byte & reg) != 0) {
print_error(ERROR_ERR, "Register \"%s\" was already defined.\n", g_label);
return -1;
}
register_byte |= reg;
}
if (register_byte == 0) {
if (accept_u == 1)
print_error(ERROR_ERR, "%s, got nothing instead.\n", s_error_no_s);
else
print_error(ERROR_ERR, "%s, got nothing instead.\n", s_error_no_u);
return -1;
}
return register_byte;
}
static int _get_register_byte_from_label_exg_tfr(void) {
/* 16-bit */
if (strcaselesscmp(g_label, "D") == 0)
return 0;
if (strcaselesscmp(g_label, "X") == 0)
return 1;
if (strcaselesscmp(g_label, "Y") == 0)
return 2;
if (strcaselesscmp(g_label, "U") == 0)
return 3;
if (strcaselesscmp(g_label, "S") == 0)
return 4;
if (strcaselesscmp(g_label, "PC") == 0)
return 5;
/* 8-bit */
if (strcaselesscmp(g_label, "A") == 0)
return 8;
if (strcaselesscmp(g_label, "B") == 0)
return 9;
if (strcaselesscmp(g_label, "CC") == 0)
return 0xA;
if (strcaselesscmp(g_label, "DP") == 0)
return 0xB;
print_error(ERROR_ERR, "Was expecting register D/X/Y/U/S/PC/A/B/CC/DP, got \"%s\" instead.\n", g_label);
return -1;
}
static int _parse_exg_tfr_registers(void) {
int register_byte, data, y, z;
/* source register */
y = g_source_index;
g_source_index = s_parser_source_index;
z = input_number();
s_parser_source_index = g_source_index;
g_source_index = y;
if (z != INPUT_NUMBER_ADDRESS_LABEL) {
print_error(ERROR_ERR, "Was expecting register D/X/Y/U/S/PC/A/B/CC/DP, got something else instead.\n");
return -1;
}
data = _get_register_byte_from_label_exg_tfr();
if (data < 0)
return -1;
register_byte = data;
/* destination register */
y = g_source_index;
g_source_index = s_parser_source_index;
z = input_number();
s_parser_source_index = g_source_index;
g_source_index = y;
if (z != INPUT_NUMBER_ADDRESS_LABEL) {
print_error(ERROR_ERR, "Was expecting register D/X/Y/U/S/PC/A/B/CC/DP, got something else instead.\n");
return -1;
}
data = _get_register_byte_from_label_exg_tfr();
if (data < 0)
return -1;
/* are we mixing 16-bit and 8-bit registers? */
if ((register_byte <= 5 && data > 5) || (register_byte > 5 && data <= 5)) {
print_error(ERROR_ERR, "Mixing of 8-bit and 16-bit registers is not allowed here.\n");
return -1;
}
register_byte = (register_byte << 4) | data;
return register_byte;
}
#endif
#if defined(SUPERFX)
/* parse a number [min, max] */
int _parse_tiny_int(int min, int max) {
int old_i, value, res;
old_i = g_source_index;
g_source_index = s_parser_source_index;
res = input_number();
s_parser_source_index = g_source_index;
g_source_index = old_i;
if (res != SUCCEEDED)
return -1;
value = g_parsed_int;
if (value < min || value > max)
return -1;
return value;
}
#endif
#if defined(MC68000)
static int _mc68000_size_check(int data, int size) {
if (size == B8(00000000)) {
/* .b */
if (data > 255 || data < -128) {
print_error(ERROR_NUM, "Out of 8-bit range.\n");
return FAILED;
}
}
else if (size == B8(00000001)) {
/* .w */
if (data > 65535 || data < -32768) {
print_error(ERROR_NUM, "Out of 16-bit range.\n");
return FAILED;
}
}
return SUCCEEDED;
}
static void _mc68000_emit_extra_data(int mode, int reg1, int reg2, int data_type, int data, char *label, int size) {
if (mode == B8(00000111) && reg1 == B8(00000100)) {
/* #<data> */
if (size == B8(00000000)) {
/* .b */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "d0 d%d ", data);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d d0 R%s ", g_active_file_info_last->line_current, label);
else
_output_assembled_instruction(s_instruction_tmp, "d0 c%d ", data);
}
else if (size == B8(00000001)) {
/* .w */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "y%d ", data);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d r%s ", g_active_file_info_last->line_current, label);
else
_output_assembled_instruction(s_instruction_tmp, "C%d ", data);
}
else {
/* .l */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "u%d ", data);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d V%s ", g_active_file_info_last->line_current, label);
else
_output_assembled_instruction(s_instruction_tmp, "U%d ", data);
}
}
else if (mode == B8(00000101) || (mode == B8(00000111) && reg1 == B8(00000000))) {
/* 16-bit */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "y%d ", data);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d r%s ", g_active_file_info_last->line_current, label);
else
_output_assembled_instruction(s_instruction_tmp, "C%d ", data);
}
else if (mode == B8(00000111) && reg1 == B8(00000010)) {
/* (d16,PC) */
stack_create_stack_caddr_offset(data_type, data, label);
_output_assembled_instruction(s_instruction_tmp, "C%d ", g_latest_stack);
}
else if ((mode == B8(00000111) && reg1 == B8(00000001)) || (mode == B8(00000111) && reg1 == B8(00000100))) {
/* 32-bit */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "u%d ", data);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d V%s ", g_active_file_info_last->line_current, label);
else
_output_assembled_instruction(s_instruction_tmp, "U%d ", data);
}
else if (mode == B8(00000111) && reg1 == B8(00000011)) {
/* (d8,Dn,PC) */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "d%d ", reg2 << 4);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d d%d ", g_active_file_info_last->line_current, reg2 << 4);
else
_output_assembled_instruction(s_instruction_tmp, "d%d ", reg2 << 4);
stack_create_stack_caddr_offset_plus_n(data_type, data, label, 1);
_output_assembled_instruction(s_instruction_tmp, "c%d ", g_latest_stack);
}
else if (mode == B8(00000110)) {
/* (d8,An,Dn) */
if (data_type == SUCCEEDED)
_output_assembled_instruction(s_instruction_tmp, "d%d d%d ", reg2 << 4, data);
else if (data_type == INPUT_NUMBER_ADDRESS_LABEL)
_output_assembled_instruction(s_instruction_tmp, "k%d d%d Q%s ", g_active_file_info_last->line_current, reg2 << 4, label);
else
_output_assembled_instruction(s_instruction_tmp, "d%d c%d ", reg2 << 4, data);
}
}
static int _mc68000_reverse_register_list(int list) {
int i, reversed = 0;
for (i = 0; i < 16; i++) {
if ((list & (1 << i)) != 0)
reversed |= 1 << (15 - i);
}
return reversed;
}
/*
mode reg1 reg2 addressing mode
000 - nnn - ??? - Dn
001 - nnn - ??? - An
010 - nnn - ??? - (An)
011 - nnn - ??? - (An)+
100 - nnn - ??? - -(An)
101 - nnn - ??? - (d16,An) / d16(An)
110 - nnn - mmm - (d8,An,Dm)
111 - 000 - ??? - (xxx).W
111 - 001 - ??? - (xxx).L
111 - 100 - ??? - #<data>
111 - 010 - ??? - (d16,PC) / d16(PC)
111 - 011 - nnn - (d8,PC,Dn)
1000 - ??? - ??? - CCR
1001 - ??? - ??? - SR
1010 - ??? - ??? - USP
1011 - lst - ??? - register list, a7-a0/d7-d0
*/
static int _mc68000_parse_ea(char *code, int *index, int *reg1, int *reg2, int *mode, int *data, int *data_type, char *label, unsigned int extras) {
int i = *index, saved_i, predecrement = NO, postincrement = NO, y, z;
char c;
*data_type = FAILED;
if (code[i] == ' ')
i++;
if (code[i] == '-') {
predecrement = YES;
i++;
}
saved_i = i;
c = toupper((int)code[i]);
if (extras == YES) {
if (c == 'C' && toupper((int)code[i+1]) == 'C' && toupper((int)code[i+2]) == 'R' && (code[i+3] == 0xA || (code[i+3] == ' ' && code[i+4] == '\\'))) {
i += 3;
*mode = B8(00001000);
*index = i;
return SUCCEEDED;
}
else if (c == 'S' && toupper((int)code[i+1]) == 'R' && (code[i+2] == 0xA || code[i+2] == ',' || (code[i+2] == ' ' && code[i+3] == '\\'))) {
i += 2;
*mode = B8(00001001);
*index = i;
return SUCCEEDED;
}
else if (c == 'U' && toupper((int)code[i+1]) == 'S' && toupper((int)code[i+2]) == 'P' && (code[i+3] == 0xA || code[i+3] == ',' || (code[i+3] == ' ' && code[i+4] == '\\'))) {
i += 3;
*mode = B8(00001010);
*index = i;
return SUCCEEDED;
}
else if ((c == 'A' || c == 'D') && (code[i+1] >= '0' && code[i+1] <= '7')) {
/* try to parse a register list, could be a single register though */
int old_i = i, registers = 0, list = 0, success = YES, number, c2, number2;
while (1) {
if (code[i] == 0xA || code[i] == ',' || (code[i] == ' ' && code[i+1] == '\\'))
break;
c = toupper((int)code[i]);
i++;
if (code[i] >= '0' && code[i] <= '7')
number = code[i++] - '0';
else {
success = NO;
break;
}
if (code[i] == '/' || code[i] == 0xA || code[i] == ',' || (code[i] == ' ' && code[i+1] == '\\')) {
/* add this register to the list */
if (c == 'A') {
if ((list & (1 << (8 + number))) == 0) {
registers++;
list |= (1 << (8 + number));
}
}
else if (c == 'D') {
if ((list & (1 << number)) == 0) {
registers++;
list |= 1 << number;
}
}
else {
success = NO;
break;
}
if (code[i] == '/')
i++;
}
else if (code[i] == '-') {
/* it's a range! */
i++;
c2 = toupper((int)code[i]);
i++;
if (c2 != c) {
/* different register type */
print_error(ERROR_NUM, "Unsupported register range.\n");
return FAILED;
}
if (code[i] >= '0' && code[i] <= '7')
number2 = code[i++] - '0';
else {
print_error(ERROR_NUM, "Malformed register range.\n");
return FAILED;
}
if (number2 < number) {
/* make number to be less than number2 */
c2 = number;
number = number2;
number2 = c2;
}
/* add registers to the list */
while (number <= number2) {
if (c == 'A') {
if ((list & (1 << (8 + number))) == 0) {
registers++;
list |= (1 << (8 + number));
}
}
else if (c == 'D') {
if ((list & (1 << number)) == 0) {
registers++;
list |= 1 << number;
}
}
else {
success = NO;
break;
}
number++;
}
if (code[i] == '/')
i++;
}
else {
success = NO;
break;
}
}
/* did we get a single register? */
if (registers <= 1 || success == NO) {
/* yes, break and continue */
i = old_i;
c = toupper((int)code[i]);
}
else {
/* no, we got a list! */
*reg1 = list;
*mode = B8(00001011);
*index = i;
return SUCCEEDED;
}
}
}
if (c == 'A' || c == 'D') {
/* An OR Dn */
if (predecrement == YES)
return FAILED;
i++;
if (code[i] >= '0' && code[i] <= '7') {
*reg1 = code[i] - '0';
i++;
if (code[i] == 0xA || code[i] == ',' || (code[i] == ' ' && code[i+1] == '\\')) {
if (c == 'A')
*mode = B8(00000001);
else
*mode = B8(00000000);
*index = i;
return SUCCEEDED;
}
}
}
else if (c == '#') {
/* #<data> */
if (predecrement == YES)
return FAILED;
i++;
y = g_source_index;
g_source_index = i;
z = input_number();
i = g_source_index;
g_source_index = y;
if (!(z == SUCCEEDED || z == INPUT_NUMBER_ADDRESS_LABEL || z == INPUT_NUMBER_STACK))
return FAILED;
*data_type = z;
if (z == INPUT_NUMBER_ADDRESS_LABEL)
strcpy(label, g_label);
else if (z == INPUT_NUMBER_STACK)
*data = g_latest_stack;
else
*data = g_parsed_int;
*mode = B8(00000111);
*reg1 = B8(00000100);
*index = i;
return SUCCEEDED;
}
i = saved_i;
if (c == '(') {
/* (An), (d16,An) etc? */
i++;
c = toupper((int)code[i]);
/* An? */
if (c == 'A') {
i++;
if (code[i] >= '0' && code[i] <= '7') {
*reg1 = code[i] - '0';
i++;
if (code[i] == ')') {
i++;
if (code[i] == '+') {
if (predecrement == YES)
return FAILED;
postincrement = YES;
i++;
}
if (code[i] != 0xA && code[i] != ',' && code[i] != '\\' && (!(code[i] == ' ' && code[i+1] == '\\')))
return FAILED;
if (predecrement == YES)
*mode = B8(00000100);
else if (postincrement == YES)
*mode = B8(00000011);
else
*mode = B8(00000010);
*index = i;
return SUCCEEDED;
}
}
}
/* d8 OR d16 here? */
y = g_source_index;
g_source_index = i;
z = input_number();
i = g_source_index;
g_source_index = y;
if (!(z == SUCCEEDED || z == INPUT_NUMBER_ADDRESS_LABEL || z == INPUT_NUMBER_STACK))
return FAILED;
/* we could have one of the following addressing modes here
101 - nnn - ??? - (d16,An)
110 - nnn - mmm - (d8,An,Dm)
111 - 010 - ??? - (d16,PC)
111 - 011 - nnn - (d8,PC,Dn) */
*data_type = z;
if (z == INPUT_NUMBER_ADDRESS_LABEL)
strcpy(label, g_label);
else if (z == INPUT_NUMBER_STACK)
*data = g_latest_stack;
else
*data = g_parsed_int;
if (code[i] == ',') {
i++;
c = toupper((int)code[i]);
if (c == 'A') {
/* (d16,An) OR (d8,An,Dm) */
if (predecrement == YES)
return FAILED;
i++;
if (code[i] >= '0' && code[i] <= '7') {
*reg1 = code[i] - '0';
i++;
if (code[i] == ')') {
i++;
if (z == SUCCEEDED && (*data > 32767 || *data < -32768)) {
print_error(ERROR_NUM, "Out of signed 16-bit range.\n");
return FAILED;
}
*mode = B8(00000101);
*index = i;
return SUCCEEDED;
}
else if (code[i] == ',') {
i++;
c = toupper((int)code[i]);
if (c == 'D') {
/* (d8,An,Dm) */
i++;
if (code[i] >= '0' && code[i] <= '7') {
*mode = B8(00000110);
*reg2 = code[i] - '0';
i++;
if (z == SUCCEEDED && (*data > 127 || *data < -128)) {
print_error(ERROR_NUM, "Out of signed 8-bit range.\n");
return FAILED;
}
if (code[i] != ')')
return FAILED;
i++;
*index = i;
return SUCCEEDED;
}
}
}
}
}
else if (c == 'P') {
/* (d16,PC) OR (d8,PC,Dn) */
i++;
if (predecrement == YES)
return FAILED;
c = toupper((int)code[i]);
if (c == 'C') {
i++;
if (code[i] == ')') {
i++;
if (z == SUCCEEDED && (*data > 32767 || *data < -32768)) {
print_error(ERROR_NUM, "Out of signed 16-bit range.\n");
return FAILED;
}
*mode = B8(00000111);
*reg1 = B8(00000010);
*index = i;
return SUCCEEDED;
}
else if (code[i] == ',') {
i++;
c = toupper((int)code[i]);
if (c == 'D') {
/* (d8,PC,Dn) */
i++;
if (code[i] >= '0' && code[i] <= '7') {
*reg2 = code[i] - '0';
i++;
if (code[i] == ')') {
i++;
if (z == SUCCEEDED && (*data > 127 || *data < -128)) {
print_error(ERROR_NUM, "Out of signed 8-bit range.\n");
return FAILED;
}
*mode = B8(00000111);
*reg1 = B8(00000011);
*index = i;
return SUCCEEDED;
}
}
}
}
}
}
}
}
i = saved_i;
/* what remains is
101 - nnn - ??? - d16(An)
111 - 000 - ??? - (xxx).W
111 - 001 - ??? - (xxx).L
111 - 010 - ??? - d16(PC) */
y = g_source_index;
g_source_index = i;
g_fail_quetly_on_non_found_functions = YES;
z = input_number();
g_fail_quetly_on_non_found_functions = NO;
i = g_source_index;
g_source_index = y;
if (!(z == SUCCEEDED || z == INPUT_NUMBER_ADDRESS_LABEL || z == INPUT_NUMBER_STACK))
return FAILED;
*data_type = z;
if (z == INPUT_NUMBER_ADDRESS_LABEL)
strcpy(label, g_label);
else if (z == INPUT_NUMBER_STACK)
*data = g_latest_stack;
else
*data = g_parsed_int;
if (code[i] == 0xA || code[i] == ',' || code[i] == '\\' || (code[i] == ' ' && code[i+1] == '\\')) {
/* we have
111 - 000 - ??? - (xxx).W
111 - 001 - ??? - (xxx).L */
*mode = B8(00000111);
if (g_operand_hint == HINT_16BIT)
*reg1 = B8(00000000);
else
*reg1 = B8(00000001);
*index = i;
return SUCCEEDED;
}
else if (code[i] == '(') {
/* we have
101 - nnn - ??? - d16(An)
111 - 010 - ??? - d16(PC) */
i++;
if (z == SUCCEEDED && (*data > 32767 || *data < -32768)) {
print_error(ERROR_NUM, "Out of signed 16-bit range.\n");
return FAILED;
}
c = toupper((int)code[i]);
if (c == 'P') {
/* d16(PC) */
i++;
c = toupper((int)code[i]);
if (c == 'C') {
i++;
if (code[i] == ')') {
i++;
*mode = B8(00000111);
*reg1 = B8(00000010);
*index = i;
return SUCCEEDED;
}
}
}
else if (c == 'A') {
/* d16(An) */
i++;
if (code[i] >= '0' && code[i] <= '7') {
*mode = B8(00000101);
*reg1 = code[i] - '0';
i++;
if (code[i] != ')')
return FAILED;
i++;
*index = i;
return SUCCEEDED;
}
}
}
return FAILED;
}
/*
mode reg addressing mode
000 - nnn - Dn
001 - nnn - An
010 - nnn - (An)
011 - nnn - (An)+
100 - nnn - -(An)
*/
static int _mc68000_parse_register(char *code, int *index, int *reg, int *mode) {
int i = *index, predecrement = NO, postincrement = NO;
char c;
if (code[i] == ' ')
i++;
if (code[i] == '-') {
predecrement = YES;
i++;
}
c = toupper((int)code[i]);
if (c == 'A' || c == 'D') {
if (predecrement == YES)
return FAILED;
i++;
if (code[i] >= '0' && code[i] <= '7') {
*reg = code[i] - '0';
i++;
if (code[i] != 0xA && code[i] != ',' && code[i] != '\\' && (!(code[i] == ' ' && code[i+1] == '\\')))
return FAILED;
if (c == 'A')
*mode = B8(00000001);
else
*mode = B8(00000000);
}
}
else if (c == '(') {
i++;
c = toupper((int)code[i]);
if (c == 'A') {
i++;
if (code[i] >= '0' && code[i] <= '7') {
*reg = code[i] - '0';
i++;
if (code[i] != ')')
return FAILED;
i++;
if (code[i] == '+') {
if (predecrement == YES)
return FAILED;
postincrement = YES;
i++;
}
if (code[i] != 0xA && code[i] != ',' && code[i] != '\\' && (!(code[i] == ' ' && code[i+1] == '\\')))
return FAILED;
if (predecrement == YES)
*mode = B8(00000100);
else if (postincrement == YES)
*mode = B8(00000011);
else
*mode = B8(00000010);
}
else
return FAILED;
}
else
return FAILED;
}
else
return FAILED;
*index = i;
return SUCCEEDED;
}
#endif
int evaluate_token(void) {
int f, x, y, last_stack_id_backup, instruction_i;