static void handle_text(char *s)
{
char *opstart = s;
operand *op;
dblock *db = NULL;
if (db = parse_string(&opstart,*s,8)) {
add_atom(0,new_data_atom(db,1));
s = opstart;
}
if (!db) {
op = new_operand();
s = skip_operand(s);
if (parse_operand(opstart,s-opstart,op,DATA_OPERAND(8))) {
atom *a;
a = new_datadef_atom(8,op);
a->align = 1;
add_atom(0,a);
}
else
syntax_error(8); /* invalid data operand */
}
eol(s);
}
static void handle_stabs(char *s)
{
char *name;
int t,o,d;
if (*s++ == '\"') {
name = s;
while (*s && *s!='\"')
s++;
name = cnvstr(name,s-name);
}
else {
syntax_error(7); /* " expected */
return;
}
s++;
t = comma_constexpr(&s);
o = comma_constexpr(&s);
d = comma_constexpr(&s);
s = skip(s);
if (*s == ',') {
s = skip(s+1);
stab_entry(name,t,o,d,s);
s = skip_operand(s);
}
else
syntax_error(9);
eol(s);
}
static void handle_datadef(char *s,int sz)
{
for (;;) {
char *opstart = s;
operand *op;
dblock *db = NULL;
if (OPSZ_BITS(sz)==8 && (*s=='\"' || *s=='\'')) {
if (db = parse_string(&opstart,*s,8)) {
add_atom(0,new_data_atom(db,1));
s = opstart;
}
}
if (!db) {
op = new_operand();
s = skip_operand(s);
if (parse_operand(opstart,s-opstart,op,DATA_OPERAND(sz)))
add_atom(0,new_datadef_atom(OPSZ_BITS(sz),op));
else
syntax_error(8); /* invalid data operand */
}
s = skip(s);
if (*s == ',')
s = skip(s+1);
else
break;
}
}
static void handle_data_offset(char *s,int size,int offset)
{
for (;;) {
char *opstart = s;
operand *op;
dblock *db = NULL;
if (size==8 && (*s=='\"' || *s=='\'')) {
if (db = parse_string(&opstart,*s,8)) {
if (offset != 0) {
int i;
for (i=0; i<db->size; i++)
db->data[i] = db->data[i] + offset;
}
add_atom(0,new_data_atom(db,1));
s = opstart;
}
}
if (!db) {
op = new_operand();
s = skip_operand(s);
if (parse_operand(opstart,s-opstart,op,DATA_OPERAND(size))) {
atom *a;
if (offset != 0)
op->value = make_expr(ADD,number_expr(offset),op->value);
a = new_datadef_atom(abs(size),op);
a->align = 1;
add_atom(0,a);
}
else
syntax_error(8); /* invalid data operand */
}
s = skip(s);
if (*s == ',') {
s = skip(s+1);
}
else if (*s == commentchar) {
break;
}
else if (*s) {
syntax_error(9); /* , expected */
return;
}
else
break;
}
eol(s);
}
static void handle_stabn(char *s)
{
int t,o,d;
t = parse_constexpr(&s);
o = comma_constexpr(&s);
d = comma_constexpr(&s);
s = skip(s);
if (*s == ',') {
s = skip(s+1);
stab_entry(NULL,t,o,d,s);
s = skip_operand(s);
}
else
syntax_error(9);
eol(s);
}
static void stab_entry(char *name,int type,int othr,int desc,char *s)
{
section *stabs;
if (!(stabs = find_section(stabname,stabattr))) {
section *str;
dblock *db;
stabs = new_section(stabname,stabattr,4);
if (!(str = find_section(stabstrname,stabstrattr))) {
str = new_section(stabstrname,stabstrattr,1);
}
else {
if (str->pc != 0)
ierror(0);
}
/* first byte of .stabstr is 0 */
add_atom(str,new_space_atom(number_expr(1),1,0));
/* compilation unit header has to be patched by output module */
new_stabstr(getfilename());
db = new_dblock();
db->size = 12;
db->data = mymalloc(12);
add_atom(stabs,new_data_atom(db,1));
}
add_const_datadef(stabs,name?new_stabstr(name):0,32,1);
add_const_datadef(stabs,type,8,1);
add_const_datadef(stabs,othr,8,1);
add_const_datadef(stabs,desc,16,1);
if (s) {
operand *op = new_operand();
int len = oplen(skip_operand(s),s);
if (parse_operand(s,len,op,DATA_OPERAND(32))) {
atom *a = new_datadef_atom(32,op);
a->align = 1;
add_atom(stabs,a);
}
else
syntax_error(8);
}
else
add_atom(stabs,new_space_atom(number_expr(4),1,0)); /* no value */
}
/* parse next macro argument */
char *parse_macro_arg(struct macro *m,char *s,
struct namelen *param,struct namelen *arg)
{
arg->len = 0; /* cannot select specific named arguments */
param->name = s;
if (*s=='\"' || *s=='\'') {
s = skip_string(s,*s,NULL);
param->len = s - param->name;
}
else {
s = skip_operand(s);
param->len = s - param->name;
}
return s;
}
static void handle_data(char *s,int size,int noalign)
{
for (;;) {
char *opstart = s;
operand *op;
dblock *db = NULL;
if ((size==8 || size==16) && *s=='\"') {
if (db = parse_string(&opstart,*s,size)) {
add_atom(0,new_data_atom(db,1));
s = opstart;
}
}
if (!db) {
op = new_operand();
s = skip_operand(s);
if (parse_operand(opstart,s-opstart,op,DATA_OPERAND(size))) {
atom *a;
a = new_datadef_atom(size,op);
if (noalign)
a->align=1;
add_atom(0,a);
}
else
syntax_error(8); /* invalid data operand */
}
s = skip(s);
if (*s == ',') {
s = skip(s+1);
}
else if (*s==commentchar)
break;
else if (*s) {
syntax_error(9); /* , expected */
return;
}
else
break;
}
eol(s);
}
static long
skip_operand(long ib, int size)
{
int c = get_byte(ib++);
switch (c >> 4) { /* mode */
case 4: /* indexed */
ib = skip_operand(ib, 0);
break;
case 9: /* autoincrement deferred */
if (c == 0x9f) { /* pc: immediate deferred */
/*
* addresses are always longwords!
*/
ib += 4;
}
break;
case 8: /* autoincrement */
if (c == 0x8f) { /* pc: immediate ==> special syntax */
ib += size;
}
break;
case 11: /* byte displacement deferred/ relative deferred */
case 10: /* byte displacement / relative mode */
ib++;
break;
case 13: /* word displacement deferred */
case 12: /* word displacement */
ib += 2;
break;
case 15: /* long displacement referred */
case 14: /* long displacement */
ib += 4;
break;
}
return ib;
}
static void handle_data(char *s,int size,int noalign,int zeroterm)
{
expr *tree;
dblock *db;
do{
char *opstart=s;
operand *op;
if(size==8&&*s=='\"'){
s=string(s,&db);
add_atom(0,new_data_atom(db,1));
}else{
op=new_operand();
s=skip_operand(s);
if(!parse_operand(opstart,s-opstart,op,DATA_OPERAND(size))){
syntax_error(8);
}else{
atom *a=new_datadef_atom(size,op);
if(noalign)
a->align=1;
add_atom(0,a);
}
}
s=skip(s);
if(*s==','){
s=skip(s+1);
}else if(*s)
syntax_error(9);
}while(*s);
if(zeroterm){
if(size!=8)
ierror(0);
db=new_dblock();
db->size=1;
db->data=mymalloc(1);
*db->data=0;
add_atom(0,new_data_atom(db,1));
}
eol(s);
}
/* Very simple, very incomplete. */
void parse(void)
{
char *s,*line,*inst,*ext[MAX_QUALIFIERS?MAX_QUALIFIERS:1],*op[MAX_OPERANDS];
int inst_len,ext_len[MAX_QUALIFIERS?MAX_QUALIFIERS:1],op_len[MAX_OPERANDS];
int i,ext_cnt,op_cnt,par_cnt;
instruction *ip;
while(line=read_next_line()){
s=line;
if(isalnum((unsigned char)*s)){
/* Handle labels at beginning of line */
char *labname,*equ;
symbol *label;
while(*s&&!isspace((unsigned char)*s)&&*s!=':')
s++;
labname=cnvstr(line,s-line);
s=skip(s+1);
if(!strncmp(s,"equ",3)&&isspace((unsigned char)s[3])){
s=skip(s+3);
label=new_abs(labname,parse_expr(&s));
}else{
label=new_labsym(0,labname);
add_atom(0,new_label_atom(label));
}
free(labname);
}
s=parse_cpu_special(s);
if(handle_directive(s))
continue;
/* skip spaces */
s=skip(s);
if(!*s)
continue;
/* read mnemonic name */
inst=s;
if(!ISIDSTART(*s)){
syntax_error(10);
continue;
}
#if MAX_QUALIFIERS==0
while(*s&&!isspace((unsigned char)*s))
s++;
#else
while(*s&&*s!='.'&&!isspace((unsigned char)*s))
s++;
#endif
inst_len=s-inst;
/* read qualifiers */
ext_cnt=0;
while(*s=='.'&&ext_cnt<MAX_QUALIFIERS){
s++;
ext[ext_cnt]=s;
while(*s&&*s!='.'&&!isspace((unsigned char)*s))
s++;
ext_len[ext_cnt]=s-ext[ext_cnt];
if(ext_len[ext_cnt]<=0)
syntax_error(1);
else
ext_cnt++;
}
if(!isspace((unsigned char)*s)) syntax_error(2);
/* read operands, terminated by comma (unless in parentheses) */
s=skip(s);
op_cnt=0;
while(*s&&op_cnt<MAX_OPERANDS){
op[op_cnt]=s;
s=skip_operand(s);
op_len[op_cnt]=s-op[op_cnt];
if(op_len[op_cnt]<=0)
syntax_error(5);
else
op_cnt++;
s=skip(s);
if(*s!=','){
break;
}else{
s=skip(s+1);
}
}
s=skip(s);
if(*s!=0) syntax_error(6);
ip=new_inst(inst,inst_len,op_cnt,op,op_len);
#if MAX_QUALIFIERS>0
if(ip){
for(i=0;i<ext_cnt;i++)
ip->qualifiers[i]=cnvstr(ext[i],ext_len[i]);
for(;i<MAX_QUALIFIERS;i++)
ip->qualifiers[i]=0;
}
#endif
if(ip){
add_atom(0,new_inst_atom(ip));
}else
;
}
}
void parse(void)
{
char *s,*line,*ext[MAX_QUALIFIERS?MAX_QUALIFIERS:1],*op[MAX_OPERANDS];
char *labname,*start;
int inst_len,ext_len[MAX_QUALIFIERS?MAX_QUALIFIERS:1],op_len[MAX_OPERANDS];
int ext_cnt,op_cnt;
instruction *ip;
while (line=read_next_line()){
if (clev >= MAXCONDLEV)
syntax_error(16,clev); /* nesting depth exceeded */
if (!cond[clev]) {
/* skip source until ELSE or ENDIF */
int idx;
s = line;
idx = check_directive(&s);
if (idx >= 0) {
if (!strncmp(directives[idx].name,"if",2)) {
ifnesting++;
}
else if (ifnesting==0 && !strncmp(directives[idx].name,"else",4)) {
cond[clev] = 1;
}
else if (directives[idx].func == handle_endif) {
if (ifnesting == 0) {
if (clev > 0)
clev--;
else
syntax_error(14); /* endif without if */
}
else
ifnesting--;
}
}
continue;
}
s=skip(line);
if(handle_directive(s))
continue;
/* skip spaces */
s=skip(s);
if(!*s||*s==commentchar)
continue;
/* check for label */
start=s;
if(labname=get_local_label(&s)){ /* local label? */
if(*s!=':'){
s=start;
myfree(labname);
labname=NULL;
}
}
else if(ISIDSTART(*s)){ /* or global label? */
s++;
while(ISIDCHAR(*s)) s++;
if(*s!=':')
s=start;
else
labname=cnvstr(start,s-start);
}
if(labname){
/* we have found a valid global or local label */
add_atom(0,new_label_atom(new_labsym(0,labname)));
s=skip(s+1);
myfree(labname);
}
if(!*s||*s==commentchar)
continue;
s=skip(parse_cpu_special(s));
if(*s==0||*s==commentchar)
continue;
if(handle_directive(s))
continue;
/* read mnemonic name */
start=s;
ext_cnt=0;
if(!ISIDSTART(*s)){
syntax_error(10);
continue;
}
#if MAX_QUALIFIERS==0
while(*s&&!isspace((unsigned char)*s))
s++;
inst_len=s-start;
#else
s=parse_instruction(s,&inst_len,ext,ext_len,&ext_cnt);
#endif
s=skip(s);
if(execute_macro(start,inst_len,ext,ext_len,ext_cnt,s,clev))
continue;
/* read operands, terminated by comma (unless in parentheses) */
op_cnt=0;
while(*s&&*s!=commentchar&&op_cnt<MAX_OPERANDS){
op[op_cnt]=s;
s=skip_operand(s);
op_len[op_cnt]=oplen(s,op[op_cnt]);
#if !ALLOW_EMPTY_OPS
if(op_len[op_cnt]<=0)
syntax_error(5);
else
#endif
op_cnt++;
s=skip(s);
if(*s!=','){
break;
}else{
s=skip(s+1);
}
}
s=skip(s);
if(*s!=0&&*s!=commentchar) syntax_error(6);
ip=new_inst(start,inst_len,op_cnt,op,op_len);
#if MAX_QUALIFIERS>0
if(ip){
int i;
for(i=0;i<ext_cnt;i++)
ip->qualifiers[i]=cnvstr(ext[i],ext_len[i]);
for(;i<MAX_QUALIFIERS;i++)
ip->qualifiers[i]=0;
}
#endif
if(ip){
add_atom(0,new_inst_atom(ip));
}else
;
}
if (clev > 0)
syntax_error(15); /* if without endif */
}
void parse(void)
{
char *s,*line,*inst;
char *ext[MAX_QUALIFIERS?MAX_QUALIFIERS:1];
char *op[MAX_OPERANDS];
int ext_len[MAX_QUALIFIERS?MAX_QUALIFIERS:1];
int op_len[MAX_OPERANDS];
int ext_cnt,op_cnt,inst_len;
instruction *ip;
while (line = read_next_line()) {
if (!cond_state()) {
/* skip source until ELSE or ENDIF */
int idx = -1;
s = skip(line);
if (labname = parse_labeldef(&s,1)) {
if (*s == ':')
s++; /* skip double-colon */
myfree(labname);
s = skip(s);
}
else {
if (inst = skip_identifier(s)) {
inst = skip(inst);
idx = check_directive(&inst);
}
}
if (idx < 0)
idx = check_directive(&s);
if (idx >= 0) {
if (directives[idx].func == handle_if)
cond_skipif();
else if (directives[idx].func == handle_else)
cond_else();
else if (directives[idx].func == handle_endif)
cond_endif();
}
continue;
}
s = skip(line);
again:
if (*s=='\0' || *line=='*' || *s==commentchar)
continue;
if (labname = parse_labeldef(&s,1)) {
/* we have found a valid global or local label */
symbol *sym = new_labsym(0,labname);
if (*s == ':') {
/* double colon automatically declares label as exported */
sym->flags |= EXPORT;
s++;
}
add_atom(0,new_label_atom(sym));
myfree(labname);
s = skip(s);
}
else {
/* there can still be a sym. in the 1st fld and an assignm. directive */
inst = s;
labname = parse_symbol(&s);
if (labname == NULL) {
syntax_error(10); /* identifier expected */
continue;
}
s = skip(s);
/* Now we have labname pointing to the first field in the line
and s pointing to the second. Find out where the directive is. */
if (!ISEOL(s)) {
#ifdef PARSE_CPU_LABEL
if (PARSE_CPU_LABEL(labname,&s)) {
myfree(labname);
continue;
}
#endif
if (handle_directive(s)) {
myfree(labname);
continue;
}
}
/* directive or mnemonic must be in the first field */
myfree(labname);
s = inst;
}
if (!strnicmp(s,".iif",4) || !(strnicmp(s,"iif",3))) {
/* immediate conditional assembly: parse line after ',' when true */
s = skip(*s=='.'?s+4:s+3);
if (do_cond(&s)) {
s = skip(s);
if (*s == ',') {
s = skip(s+1);
goto again;
}
else
syntax_error(0); /* malformed immediate-if */
}
continue;
}
/* check for directives */
s = parse_cpu_special(s);
if (ISEOL(s))
continue;
if (handle_directive(s))
continue;
/* read mnemonic name */
inst = s;
ext_cnt = 0;
if (!ISIDSTART(*s)) {
syntax_error(10); /* identifier expected */
continue;
}
#if MAX_QUALIFIERS==0
while (*s && !isspace((unsigned char)*s))
s++;
inst_len = s - inst;
#else
s = parse_instruction(s,&inst_len,ext,ext_len,&ext_cnt);
#endif
if (!isspace((unsigned char)*s) && *s!='\0')
syntax_error(2); /* no space before operands */
s = skip(s);
if (execute_macro(inst,inst_len,ext,ext_len,ext_cnt,s))
continue;
/* read operands, terminated by comma or blank (unless in parentheses) */
op_cnt = 0;
while (!ISEOL(s) && op_cnt<MAX_OPERANDS) {
op[op_cnt] = s;
s = skip_operand(s);
op_len[op_cnt] = oplen(s,op[op_cnt]);
#if !ALLOW_EMPTY_OPS
if (op_len[op_cnt] <= 0)
syntax_error(5); /* missing operand */
else
#endif
op_cnt++;
s = skip(s);
if (*s != ',')
break;
else
s = skip(s+1);
}
eol(s);
ip = new_inst(inst,inst_len,op_cnt,op,op_len);
#if MAX_QUALIFIERS>0
if (ip) {
int i;
for (i=0; i<ext_cnt; i++)
ip->qualifiers[i] = cnvstr(ext[i],ext_len[i]);
for(; i<MAX_QUALIFIERS; i++)
ip->qualifiers[i] = NULL;
}
#endif
if (ip)
add_atom(0,new_inst_atom(ip));
}
cond_check(); /* check for open conditional blocks */
}
long
skip_opcode(long ib)
{
u_int opc;
int size;
const char *argp; /* pointer into argument-list */
opc = get_byte(ib++);
if (opc >= 0xfd) {
/* two byte op-code */
opc = opc << 8;
opc += get_byte(ib++);
argp = vax_inst2[INDEX_OPCODE(opc)].argdesc;
} else
argp = vax_inst[opc].argdesc;
if (argp == NULL || *argp == '\0')
return ib;
while (*argp) {
switch (*argp) {
case 'b': /* branch displacement */
switch (*(++argp)) {
case 'b':
ib++;
break;
case 'w':
ib += 2;
break;
case 'l':
ib += 4;
break;
}
break;
case 'a': /* absolute addressing mode */
/* FALLTHROUGH */
default:
switch (*(++argp)) {
case 'b': /* Byte */
size = 1;
break;
case 'w': /* Word */
size = 2;
break;
case 'l': /* Long-Word */
case 'f': /* F_Floating */
size = 4;
break;
case 'q': /* Quad-Word */
case 'd': /* D_Floating */
case 'g': /* G_Floating */
size = 8;
break;
case 'o': /* Octa-Word */
case 'h': /* H_Floating */
size = 16;
break;
default:
size = 0;
}
ib = skip_operand(ib, size);
}
if (!*argp || !*++argp)
break;
if (*argp++ != ',')
break;
}
return ib;
}
