static int
bc_align_expand(yasm_bytecode *bc, int span, long old_val, long new_val,
/*@out@*/ long *neg_thres, /*@out@*/ long *pos_thres)
{
bytecode_align *align = (bytecode_align *)bc->contents;
unsigned long end;
unsigned long boundary =
yasm_intnum_get_uint(yasm_expr_get_intnum(&align->boundary, 0));
if (boundary == 0) {
bc->len = 0;
*pos_thres = new_val;
return 0;
}
end = (unsigned long)new_val;
if ((unsigned long)new_val & (boundary-1))
end = ((unsigned long)new_val & ~(boundary-1)) + boundary;
*pos_thres = (long)end;
bc->len = end - (unsigned long)new_val;
if (align->maxskip) {
unsigned long maxskip =
yasm_intnum_get_uint(yasm_expr_get_intnum(&align->maxskip, 0));
if (bc->len > maxskip) {
*pos_thres = (long)end-maxskip-1;
bc->len = 0;
}
}
return 1;
}
static void
x86_dir_cpu(yasm_object *object, yasm_valparamhead *valparams,
yasm_valparamhead *objext_valparams, unsigned long line)
{
yasm_arch_x86 *arch_x86 = (yasm_arch_x86 *)object->arch;
yasm_valparam *vp;
yasm_vps_foreach(vp, valparams) {
/*@null@*/ /*@dependent@*/ const char *s = yasm_vp_string(vp);
if (s)
yasm_x86__parse_cpu(arch_x86, s, strlen(s));
else if (vp->type == YASM_PARAM_EXPR) {
const yasm_intnum *intcpu;
intcpu = yasm_expr_get_intnum(&vp->param.e, 0);
if (!intcpu)
yasm_error_set(YASM_ERROR_SYNTAX,
N_("invalid argument to [%s]"), "CPU");
else {
char strcpu[16];
sprintf(strcpu, "%lu", yasm_intnum_get_uint(intcpu));
yasm_x86__parse_cpu(arch_x86, strcpu, strlen(strcpu));
}
} else
yasm_error_set(YASM_ERROR_SYNTAX, N_("invalid argument to [%s]"),
"CPU");
}
}
static int
bc_incbin_tobytes(yasm_bytecode *bc, unsigned char **bufp,
unsigned char *bufstart, void *d,
yasm_output_value_func output_value,
/*@unused@*/ yasm_output_reloc_func output_reloc)
{
bytecode_incbin *incbin = (bytecode_incbin *)bc->contents;
FILE *f;
/*@dependent@*/ /*@null@*/ const yasm_intnum *num;
unsigned long start = 0;
/* Convert start to integer value */
if (incbin->start) {
num = yasm_expr_get_intnum(&incbin->start, 0);
if (!num)
yasm_internal_error(
N_("could not determine start in bc_tobytes_incbin"));
start = yasm_intnum_get_uint(num);
}
/* Open file */
f = yasm_fopen_include(incbin->filename, incbin->from, "rb", NULL);
if (!f) {
yasm_error_set(YASM_ERROR_IO, N_("`incbin': unable to open file `%s'"),
incbin->filename);
return 1;
}
/* Seek to start of data */
if (fseek(f, (long)start, SEEK_SET) < 0) {
yasm_error_set(YASM_ERROR_IO,
N_("`incbin': unable to seek on file `%s'"),
incbin->filename);
fclose(f);
return 1;
}
/* Read len bytes */
if (fread(*bufp, 1, (size_t)bc->len, f) < (size_t)bc->len) {
yasm_error_set(YASM_ERROR_IO,
N_("`incbin': unable to read %lu bytes from file `%s'"),
bc->len, incbin->filename);
fclose(f);
return 1;
}
*bufp += bc->len;
fclose(f);
return 0;
}
static int
bc_incbin_calc_len(yasm_bytecode *bc, yasm_bc_add_span_func add_span,
void *add_span_data)
{
bytecode_incbin *incbin = (bytecode_incbin *)bc->contents;
FILE *f;
/*@dependent@*/ /*@null@*/ const yasm_intnum *num;
unsigned long start = 0, maxlen = 0xFFFFFFFFUL, flen;
/* Try to convert start to integer value */
if (incbin->start) {
num = yasm_expr_get_intnum(&incbin->start, 0);
if (num)
start = yasm_intnum_get_uint(num);
if (!num) {
/* FIXME */
yasm_error_set(YASM_ERROR_NOT_IMPLEMENTED,
N_("incbin does not yet understand non-constant"));
return -1;
}
}
/* Try to convert maxlen to integer value */
if (incbin->maxlen) {
num = yasm_expr_get_intnum(&incbin->maxlen, 0);
if (num)
maxlen = yasm_intnum_get_uint(num);
if (!num) {
/* FIXME */
yasm_error_set(YASM_ERROR_NOT_IMPLEMENTED,
N_("incbin does not yet understand non-constant"));
return -1;
}
}
/* Open file and determine its length */
f = yasm_fopen_include(incbin->filename, incbin->from, "rb", NULL);
if (!f) {
yasm_error_set(YASM_ERROR_IO,
N_("`incbin': unable to open file `%s'"),
incbin->filename);
return -1;
}
if (fseek(f, 0L, SEEK_END) < 0) {
yasm_error_set(YASM_ERROR_IO,
N_("`incbin': unable to seek on file `%s'"),
incbin->filename);
return -1;
}
flen = (unsigned long)ftell(f);
fclose(f);
/* Compute length of incbin from start, maxlen, and len */
if (start > flen) {
yasm_warn_set(YASM_WARN_GENERAL,
N_("`incbin': start past end of file `%s'"),
incbin->filename);
start = flen;
}
flen -= start;
if (incbin->maxlen)
if (maxlen < flen)
flen = maxlen;
bc->len += flen;
return 0;
}
static int
value_finalize_scan(yasm_value *value, yasm_expr *e,
/*@null@*/ yasm_bytecode *expr_precbc, int ssym_not_ok)
{
int i;
/*@dependent@*/ yasm_section *sect;
/*@dependent@*/ /*@null@*/ yasm_bytecode *precbc;
unsigned long shamt; /* for SHR */
/* Yes, this has a maximum upper bound on 32 terms, based on an
* "insane number of terms" (and ease of implementation) WAG.
* The right way to do this would be a stack-based alloca, but that's
* not ISO C. We really don't want to malloc here as this function is
* hit a lot!
*
* This is a bitmask to keep things small, as this is a recursive
* routine and we don't want to eat up stack space.
*/
unsigned long used; /* for ADD */
/* Thanks to this running after a simplify, we don't need to iterate
* down through IDENTs or handle SUB.
*
* We scan for a single symrec, gathering info along the way. After
* we've found the symrec, we keep scanning but error if we find
* another one. We pull out the single symrec and any legal operations
* performed on it.
*
* Also, if we find a float anywhere, we don't allow mixing of a single
* symrec with it.
*/
switch (e->op) {
case YASM_EXPR_ADD:
/* Okay for single symrec anywhere in expr.
* Check for single symrec anywhere.
* Handle symrec-symrec by checking for (-1*symrec)
* and symrec term pairs (where both symrecs are in the same
* segment).
*/
if (e->numterms > 32)
yasm__fatal(N_("expression on line %d has too many add terms;"
" internal limit of 32"), e->line);
used = 0;
for (i=0; i<e->numterms; i++) {
int j;
yasm_expr *sube;
yasm_intnum *intn;
yasm_symrec *sym;
/*@dependent@*/ yasm_section *sect2;
/*@dependent@*/ /*@null@*/ yasm_bytecode *precbc2;
/* First look for an (-1*symrec) term */
if (e->terms[i].type != YASM_EXPR_EXPR)
continue;
sube = e->terms[i].data.expn;
if (sube->op != YASM_EXPR_MUL || sube->numterms != 2) {
/* recurse instead */
if (value_finalize_scan(value, sube, expr_precbc,
ssym_not_ok))
return 1;
continue;
}
if (sube->terms[0].type == YASM_EXPR_INT &&
sube->terms[1].type == YASM_EXPR_SYM) {
intn = sube->terms[0].data.intn;
sym = sube->terms[1].data.sym;
} else if (sube->terms[0].type == YASM_EXPR_SYM &&
sube->terms[1].type == YASM_EXPR_INT) {
sym = sube->terms[0].data.sym;
intn = sube->terms[1].data.intn;
} else {
if (value_finalize_scan(value, sube, expr_precbc,
ssym_not_ok))
return 1;
continue;
}
if (!yasm_intnum_is_neg1(intn)) {
if (value_finalize_scan(value, sube, expr_precbc,
ssym_not_ok))
return 1;
continue;
}
/* Look for the same symrec term; even if both are external,
* they should cancel out.
*/
for (j=0; j<e->numterms; j++) {
if (e->terms[j].type == YASM_EXPR_SYM
&& e->terms[j].data.sym == sym
&& (used & (1<<j)) == 0) {
/* Mark as used */
used |= 1<<j;
/* Replace both symrec portions with 0 */
yasm_expr_destroy(sube);
e->terms[i].type = YASM_EXPR_INT;
e->terms[i].data.intn = yasm_intnum_create_uint(0);
e->terms[j].type = YASM_EXPR_INT;
e->terms[j].data.intn = yasm_intnum_create_uint(0);
break; /* stop looking */
}
}
if (j != e->numterms)
continue;
if (!yasm_symrec_get_label(sym, &precbc)) {
if (value_finalize_scan(value, sube, expr_precbc,
ssym_not_ok))
return 1;
continue;
}
sect2 = yasm_bc_get_section(precbc);
/* Now look for a unused symrec term in the same segment */
for (j=0; j<e->numterms; j++) {
if (e->terms[j].type == YASM_EXPR_SYM
&& yasm_symrec_get_label(e->terms[j].data.sym,
&precbc2)
&& (sect = yasm_bc_get_section(precbc2))
&& sect == sect2
&& (used & (1<<j)) == 0) {
/* Mark as used */
used |= 1<<j;
break; /* stop looking */
}
}
/* We didn't match in the same segment. If the
* -1*symrec is actually -1*curpos, we can match
* unused symrec terms in other segments and generate
* a curpos-relative reloc.
*
* Similarly, handle -1*symrec in other segment via the
* following transformation:
* other-this = (other-.)+(.-this)
* We can only do this transformation if "this" is in
* this expr's segment.
*
* Don't do this if we've already become curpos-relative.
* The unmatched symrec will be caught below.
*/
if (j == e->numterms && !value->curpos_rel
&& (yasm_symrec_is_curpos(sym)
|| (expr_precbc
&& sect2 == yasm_bc_get_section(expr_precbc)))) {
for (j=0; j<e->numterms; j++) {
if (e->terms[j].type == YASM_EXPR_SYM
&& !yasm_symrec_get_equ(e->terms[j].data.sym)
&& !yasm_symrec_is_special(e->terms[j].data.sym)
&& (used & (1<<j)) == 0) {
/* Mark as used */
used |= 1<<j;
/* Mark value as curpos-relative */
if (value->rel || ssym_not_ok)
return 1;
value->rel = e->terms[j].data.sym;
value->curpos_rel = 1;
if (yasm_symrec_is_curpos(sym)) {
/* Replace both symrec portions with 0 */
yasm_expr_destroy(sube);
e->terms[i].type = YASM_EXPR_INT;
e->terms[i].data.intn =
yasm_intnum_create_uint(0);
e->terms[j].type = YASM_EXPR_INT;
e->terms[j].data.intn =
yasm_intnum_create_uint(0);
} else {
/* Replace positive portion with curpos */
yasm_object *object =
yasm_section_get_object(sect2);
yasm_symtab *symtab = object->symtab;
e->terms[j].data.sym =
yasm_symtab_define_curpos
(symtab, ".", expr_precbc, e->line);
}
break; /* stop looking */
}
}
}
if (j == e->numterms)
return 1; /* We didn't find a match! */
}
/* Look for unmatched symrecs. If we've already found one or
* we don't WANT to find one, error out.
*/
for (i=0; i<e->numterms; i++) {
if (e->terms[i].type == YASM_EXPR_SYM
&& (used & (1<<i)) == 0) {
if (value->rel || ssym_not_ok)
return 1;
value->rel = e->terms[i].data.sym;
/* and replace with 0 */
e->terms[i].type = YASM_EXPR_INT;
e->terms[i].data.intn = yasm_intnum_create_uint(0);
}
}
break;
case YASM_EXPR_SHR:
/* Okay for single symrec in LHS and constant on RHS.
* Single symrecs are not okay on RHS.
* If RHS is non-constant, don't allow single symrec on LHS.
* XXX: should rshift be an expr instead??
*/
/* Check for single sym on LHS */
if (e->terms[0].type != YASM_EXPR_SYM)
break;
/* If we already have a sym, we can't take another one */
if (value->rel || ssym_not_ok)
return 1;
/* RHS must be a positive integer */
if (e->terms[1].type != YASM_EXPR_INT)
return 1; /* can't shift sym by non-constant integer */
shamt = yasm_intnum_get_uint(e->terms[1].data.intn);
if ((shamt + value->rshift) > YASM_VALUE_RSHIFT_MAX)
return 1; /* total shift would be too large */
/* Update value */
value->rshift += shamt;
value->rel = e->terms[0].data.sym;
/* Replace symbol with 0 */
e->terms[0].type = YASM_EXPR_INT;
e->terms[0].data.intn = yasm_intnum_create_uint(0);
/* Just leave SHR in place */
break;
case YASM_EXPR_SEG:
/* Okay for single symrec (can only be done once).
* Not okay for anything BUT a single symrec as an immediate
* child.
*/
if (e->terms[0].type != YASM_EXPR_SYM)
return 1;
if (value->seg_of)
return 1; /* multiple SEG not legal */
value->seg_of = 1;
if (value->rel || ssym_not_ok)
return 1; /* got a relative portion somewhere else? */
value->rel = e->terms[0].data.sym;
/* replace with ident'ed 0 */
e->op = YASM_EXPR_IDENT;
e->terms[0].type = YASM_EXPR_INT;
e->terms[0].data.intn = yasm_intnum_create_uint(0);
break;
case YASM_EXPR_WRT:
/* Okay for single symrec in LHS and either a register or single
* symrec (as an immediate child) on RHS.
* If a single symrec on RHS, can only be done once.
* WRT reg is left in expr for arch to look at.
*/
/* Handle RHS */
switch (e->terms[1].type) {
case YASM_EXPR_SYM:
if (value->wrt)
return 1;
value->wrt = e->terms[1].data.sym;
/* and drop the WRT portion */
e->op = YASM_EXPR_IDENT;
e->numterms = 1;
break;
case YASM_EXPR_REG:
break; /* ignore */
default:
return 1;
}
/* Handle LHS */
switch (e->terms[0].type) {
case YASM_EXPR_SYM:
if (value->rel || ssym_not_ok)
return 1;
value->rel = e->terms[0].data.sym;
/* and replace with 0 */
e->terms[0].type = YASM_EXPR_INT;
e->terms[0].data.intn = yasm_intnum_create_uint(0);
break;
case YASM_EXPR_EXPR:
/* recurse */
return value_finalize_scan(value, e->terms[0].data.expn,
expr_precbc, ssym_not_ok);
default:
break; /* ignore */
}
break;
default:
/* Single symrec not allowed anywhere */
for (i=0; i<e->numterms; i++) {
switch (e->terms[i].type) {
case YASM_EXPR_SYM:
return 1;
case YASM_EXPR_EXPR:
/* recurse */
return value_finalize_scan(value,
e->terms[i].data.expn,
expr_precbc, 1);
default:
break;
}
}
break;
}
return 0;
}
static int
xdf_objfmt_output_sym(yasm_symrec *sym, /*@null@*/ void *d)
{
/*@null@*/ xdf_objfmt_output_info *info = (xdf_objfmt_output_info *)d;
yasm_sym_vis vis = yasm_symrec_get_visibility(sym);
assert(info != NULL);
if (info->all_syms || vis != YASM_SYM_LOCAL) {
/*@only@*/ char *name = yasm_symrec_get_global_name(sym, info->object);
const yasm_expr *equ_val;
const yasm_intnum *intn;
size_t len = strlen(name);
unsigned long value = 0;
long scnum = -3; /* -3 = debugging symbol */
/*@dependent@*/ /*@null@*/ yasm_section *sect;
/*@dependent@*/ /*@null@*/ yasm_bytecode *precbc;
unsigned long flags = 0;
unsigned char *localbuf;
if (vis & YASM_SYM_GLOBAL)
flags = XDF_SYM_GLOBAL;
/* Look at symrec for value/scnum/etc. */
if (yasm_symrec_get_label(sym, &precbc)) {
if (precbc)
sect = yasm_bc_get_section(precbc);
else
sect = NULL;
/* it's a label: get value and offset.
* If there is not a section, leave as debugging symbol.
*/
if (sect) {
/*@dependent@*/ /*@null@*/ xdf_section_data *csectd;
csectd = yasm_section_get_data(sect, &xdf_section_data_cb);
if (csectd)
scnum = csectd->scnum;
else
yasm_internal_error(N_("didn't understand section"));
if (precbc)
value += yasm_bc_next_offset(precbc);
}
} else if ((equ_val = yasm_symrec_get_equ(sym))) {
yasm_expr *equ_val_copy = yasm_expr_copy(equ_val);
intn = yasm_expr_get_intnum(&equ_val_copy, 1);
if (!intn) {
if (vis & YASM_SYM_GLOBAL) {
yasm_error_set(YASM_ERROR_NOT_CONSTANT,
N_("global EQU value not an integer expression"));
yasm_errwarn_propagate(info->errwarns, equ_val->line);
}
} else
value = yasm_intnum_get_uint(intn);
yasm_expr_destroy(equ_val_copy);
flags |= XDF_SYM_EQU;
scnum = -2; /* -2 = absolute symbol */
} else {
if (vis & YASM_SYM_EXTERN) {
flags = XDF_SYM_EXTERN;
scnum = -1;
}
}
localbuf = info->buf;
YASM_WRITE_32_L(localbuf, scnum); /* section number */
YASM_WRITE_32_L(localbuf, value); /* value */
YASM_WRITE_32_L(localbuf, info->strtab_offset);
info->strtab_offset += (unsigned long)(len+1);
YASM_WRITE_32_L(localbuf, flags); /* flags */
fwrite(info->buf, 16, 1, info->f);
yasm_xfree(name);
}
return 0;
}
static int
bc_align_tobytes(yasm_bytecode *bc, unsigned char **bufp, void *d,
yasm_output_value_func output_value,
/*@unused@*/ yasm_output_reloc_func output_reloc)
{
bytecode_align *align = (bytecode_align *)bc->contents;
unsigned long len;
unsigned long boundary =
yasm_intnum_get_uint(yasm_expr_get_intnum(&align->boundary, 0));
if (boundary == 0)
return 0;
else {
unsigned long end = bc->offset;
if (bc->offset & (boundary-1))
end = (bc->offset & ~(boundary-1)) + boundary;
len = end - bc->offset;
if (len == 0)
return 0;
if (align->maxskip) {
unsigned long maxskip =
yasm_intnum_get_uint(yasm_expr_get_intnum(&align->maxskip, 0));
if (len > maxskip)
return 0;
}
}
if (align->fill) {
unsigned long v;
v = yasm_intnum_get_uint(yasm_expr_get_intnum(&align->fill, 0));
memset(*bufp, (int)v, len);
*bufp += len;
} else if (align->code_fill) {
unsigned long maxlen = 15;
while (!align->code_fill[maxlen] && maxlen>0)
maxlen--;
if (maxlen == 0) {
yasm_error_set(YASM_ERROR_GENERAL,
N_("could not find any code alignment size"));
return 1;
}
/* Fill with maximum code fill as much as possible */
while (len > maxlen) {
memcpy(*bufp, align->code_fill[maxlen], maxlen);
*bufp += maxlen;
len -= maxlen;
}
if (!align->code_fill[len]) {
yasm_error_set(YASM_ERROR_VALUE,
N_("invalid alignment size %d"), len);
return 1;
}
/* Handle rest of code fill */
memcpy(*bufp, align->code_fill[len], len);
*bufp += len;
} else {
/* Just fill with 0 */
memset(*bufp, 0, len);
*bufp += len;
}
return 0;
}
