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old-cross-binutils/gas/read.c
Nick Clifton 9497f5ac6b This adjusts equate handling by 
- allowing true forward references (which will always assume the referenced
  symbols have at the point of use) through the new .eqv pseudo-op and the
  new == operator
- disallowing changing .equiv-generated equates (so that the protection this
  provides is both forward and backward)
- snapshotting equates when their value gets changed so that previous uses
  don't get affected by the new value.
- allowing expressions in places where absolute expressions (or register
  names) are needed which were not completely resolvable at the point of
  their definition but which are fully resolvable at the point of use

In addition it fixes PR/288.
2005-10-11 11:16:17 +00:00

5309 lines
125 KiB
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/* read.c - read a source file -
Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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 2, or (at your option)
any later version.
GAS 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 GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
/* If your chars aren't 8 bits, you will change this a bit (eg. to 0xFF).
But then, GNU isn't spozed to run on your machine anyway.
(RMS is so shortsighted sometimes.) */
#define MASK_CHAR ((int)(unsigned char) -1)
/* This is the largest known floating point format (for now). It will
grow when we do 4361 style flonums. */
#define MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT (16)
/* Routines that read assembler source text to build spaghetti in memory.
Another group of these functions is in the expr.c module. */
#include "as.h"
#include "safe-ctype.h"
#include "subsegs.h"
#include "sb.h"
#include "macro.h"
#include "obstack.h"
#include "listing.h"
#include "ecoff.h"
#include "dw2gencfi.h"
#ifndef TC_START_LABEL
#define TC_START_LABEL(x,y) (x == ':')
#endif
/* Set by the object-format or the target. */
#ifndef TC_IMPLICIT_LCOMM_ALIGNMENT
#define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) \
do \
{ \
if ((SIZE) >= 8) \
(P2VAR) = 3; \
else if ((SIZE) >= 4) \
(P2VAR) = 2; \
else if ((SIZE) >= 2) \
(P2VAR) = 1; \
else \
(P2VAR) = 0; \
} \
while (0)
#endif
char *input_line_pointer; /*->next char of source file to parse. */
#if BITS_PER_CHAR != 8
/* The following table is indexed by[(char)] and will break if
a char does not have exactly 256 states (hopefully 0:255!)! */
die horribly;
#endif
#ifndef LEX_AT
#define LEX_AT 0
#endif
#ifndef LEX_BR
/* The RS/6000 assembler uses {,},[,] as parts of symbol names. */
#define LEX_BR 0
#endif
#ifndef LEX_PCT
/* The Delta 68k assembler permits % inside label names. */
#define LEX_PCT 0
#endif
#ifndef LEX_QM
/* The PowerPC Windows NT assemblers permits ? inside label names. */
#define LEX_QM 0
#endif
#ifndef LEX_HASH
/* The IA-64 assembler uses # as a suffix designating a symbol. We include
it in the symbol and strip it out in tc_canonicalize_symbol_name. */
#define LEX_HASH 0
#endif
#ifndef LEX_DOLLAR
#define LEX_DOLLAR 3
#endif
#ifndef LEX_TILDE
/* The Delta 68k assembler permits ~ at start of label names. */
#define LEX_TILDE 0
#endif
/* Used by is_... macros. our ctype[]. */
char lex_type[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ABCDEFGHIJKLMNO */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* PQRSTUVWXYZ[\]^_ */
0, 0, 0, LEX_HASH, LEX_DOLLAR, LEX_PCT, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, /* _!"#$%&'()*+,-./ */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, LEX_QM, /* 0123456789:;<=>? */
LEX_AT, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* @ABCDEFGHIJKLMNO */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, 0, 3, /* PQRSTUVWXYZ[\]^_ */
0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* `abcdefghijklmno */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, LEX_BR, 0, LEX_BR, LEX_TILDE, 0, /* pqrstuvwxyz{|}~. */
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
};
/* In: a character.
Out: 1 if this character ends a line. */
char is_end_of_line[256] = {
#ifdef CR_EOL
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, /* @abcdefghijklmno */
#else
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, /* @abcdefghijklmno */
#endif
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* _!"#$%&'()*+,-./ */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0123456789:;<=>? */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 /* */
};
#ifndef TC_CASE_SENSITIVE
char original_case_string[128];
#endif
/* Functions private to this file. */
static char *buffer; /* 1st char of each buffer of lines is here. */
static char *buffer_limit; /*->1 + last char in buffer. */
/* TARGET_BYTES_BIG_ENDIAN is required to be defined to either 0 or 1
in the tc-<CPU>.h file. See the "Porting GAS" section of the
internals manual. */
int target_big_endian = TARGET_BYTES_BIG_ENDIAN;
/* Variables for handling include file directory table. */
/* Table of pointers to directories to search for .include's. */
char **include_dirs;
/* How many are in the table. */
int include_dir_count;
/* Length of longest in table. */
int include_dir_maxlen = 1;
#ifndef WORKING_DOT_WORD
struct broken_word *broken_words;
int new_broken_words;
#endif
/* The current offset into the absolute section. We don't try to
build frags in the absolute section, since no data can be stored
there. We just keep track of the current offset. */
addressT abs_section_offset;
/* If this line had an MRI style label, it is stored in this variable.
This is used by some of the MRI pseudo-ops. */
symbolS *line_label;
/* This global variable is used to support MRI common sections. We
translate such sections into a common symbol. This variable is
non-NULL when we are in an MRI common section. */
symbolS *mri_common_symbol;
/* In MRI mode, after a dc.b pseudo-op with an odd number of bytes, we
need to align to an even byte boundary unless the next pseudo-op is
dc.b, ds.b, or dcb.b. This variable is set to 1 if an alignment
may be needed. */
static int mri_pending_align;
#ifndef NO_LISTING
#ifdef OBJ_ELF
/* This variable is set to be non-zero if the next string we see might
be the name of the source file in DWARF debugging information. See
the comment in emit_expr for the format we look for. */
static int dwarf_file_string;
#endif
#endif
static void do_s_func (int end_p, const char *default_prefix);
static void do_align (int, char *, int, int);
static void s_align (int, int);
static void s_altmacro (int);
static void s_bad_end (int);
static int hex_float (int, char *);
static segT get_known_segmented_expression (expressionS * expP);
static void pobegin (void);
static int get_line_sb (sb *);
static void generate_file_debug (void);
static char *_find_end_of_line (char *, int, int);
void
read_begin (void)
{
const char *p;
pobegin ();
obj_read_begin_hook ();
/* Something close -- but not too close -- to a multiple of 1024.
The debugging malloc I'm using has 24 bytes of overhead. */
obstack_begin (&notes, chunksize);
obstack_begin (&cond_obstack, chunksize);
/* Use machine dependent syntax. */
for (p = line_separator_chars; *p; p++)
is_end_of_line[(unsigned char) *p] = 1;
/* Use more. FIXME-SOMEDAY. */
if (flag_mri)
lex_type['?'] = 3;
}
#ifndef TC_ADDRESS_BYTES
#define TC_ADDRESS_BYTES address_bytes
static inline int
address_bytes (void)
{
/* Choose smallest of 1, 2, 4, 8 bytes that is large enough to
contain an address. */
int n = (stdoutput->arch_info->bits_per_address - 1) / 8;
n |= n >> 1;
n |= n >> 2;
n += 1;
return n;
}
#endif
/* Set up pseudo-op tables. */
static struct hash_control *po_hash;
static const pseudo_typeS potable[] = {
{"abort", s_abort, 0},
{"align", s_align_ptwo, 0},
{"altmacro", s_altmacro, 1},
{"ascii", stringer, 0},
{"asciz", stringer, 1},
{"balign", s_align_bytes, 0},
{"balignw", s_align_bytes, -2},
{"balignl", s_align_bytes, -4},
/* block */
{"byte", cons, 1},
{"comm", s_comm, 0},
{"common", s_mri_common, 0},
{"common.s", s_mri_common, 1},
{"data", s_data, 0},
{"dc", cons, 2},
#ifdef TC_ADDRESS_BYTES
{"dc.a", cons, 0},
#endif
{"dc.b", cons, 1},
{"dc.d", float_cons, 'd'},
{"dc.l", cons, 4},
{"dc.s", float_cons, 'f'},
{"dc.w", cons, 2},
{"dc.x", float_cons, 'x'},
{"dcb", s_space, 2},
{"dcb.b", s_space, 1},
{"dcb.d", s_float_space, 'd'},
{"dcb.l", s_space, 4},
{"dcb.s", s_float_space, 'f'},
{"dcb.w", s_space, 2},
{"dcb.x", s_float_space, 'x'},
{"ds", s_space, 2},
{"ds.b", s_space, 1},
{"ds.d", s_space, 8},
{"ds.l", s_space, 4},
{"ds.p", s_space, 12},
{"ds.s", s_space, 4},
{"ds.w", s_space, 2},
{"ds.x", s_space, 12},
{"debug", s_ignore, 0},
#ifdef S_SET_DESC
{"desc", s_desc, 0},
#endif
/* dim */
{"double", float_cons, 'd'},
/* dsect */
{"eject", listing_eject, 0}, /* Formfeed listing. */
{"else", s_else, 0},
{"elsec", s_else, 0},
{"elseif", s_elseif, (int) O_ne},
{"end", s_end, 0},
{"endc", s_endif, 0},
{"endfunc", s_func, 1},
{"endif", s_endif, 0},
{"endm", s_bad_end, 0},
{"endr", s_bad_end, 1},
/* endef */
{"equ", s_set, 0},
{"equiv", s_set, 1},
{"eqv", s_set, -1},
{"err", s_err, 0},
{"error", s_errwarn, 1},
{"exitm", s_mexit, 0},
/* extend */
{"extern", s_ignore, 0}, /* We treat all undef as ext. */
{"appfile", s_app_file, 1},
{"appline", s_app_line, 0},
{"fail", s_fail, 0},
{"file", s_app_file, 0},
{"fill", s_fill, 0},
{"float", float_cons, 'f'},
{"format", s_ignore, 0},
{"func", s_func, 0},
{"global", s_globl, 0},
{"globl", s_globl, 0},
{"hword", cons, 2},
{"if", s_if, (int) O_ne},
{"ifb", s_ifb, 1},
{"ifc", s_ifc, 0},
{"ifdef", s_ifdef, 0},
{"ifeq", s_if, (int) O_eq},
{"ifeqs", s_ifeqs, 0},
{"ifge", s_if, (int) O_ge},
{"ifgt", s_if, (int) O_gt},
{"ifle", s_if, (int) O_le},
{"iflt", s_if, (int) O_lt},
{"ifnb", s_ifb, 0},
{"ifnc", s_ifc, 1},
{"ifndef", s_ifdef, 1},
{"ifne", s_if, (int) O_ne},
{"ifnes", s_ifeqs, 1},
{"ifnotdef", s_ifdef, 1},
{"incbin", s_incbin, 0},
{"include", s_include, 0},
{"int", cons, 4},
{"irp", s_irp, 0},
{"irep", s_irp, 0},
{"irpc", s_irp, 1},
{"irepc", s_irp, 1},
{"lcomm", s_lcomm, 0},
{"lflags", listing_flags, 0}, /* Listing flags. */
{"linkonce", s_linkonce, 0},
{"list", listing_list, 1}, /* Turn listing on. */
{"llen", listing_psize, 1},
{"long", cons, 4},
{"lsym", s_lsym, 0},
{"macro", s_macro, 0},
{"mexit", s_mexit, 0},
{"mri", s_mri, 0},
{".mri", s_mri, 0}, /* Special case so .mri works in MRI mode. */
{"name", s_ignore, 0},
{"noaltmacro", s_altmacro, 0},
{"noformat", s_ignore, 0},
{"nolist", listing_list, 0}, /* Turn listing off. */
{"nopage", listing_nopage, 0},
{"octa", cons, 16},
{"offset", s_struct, 0},
{"org", s_org, 0},
{"p2align", s_align_ptwo, 0},
{"p2alignw", s_align_ptwo, -2},
{"p2alignl", s_align_ptwo, -4},
{"page", listing_eject, 0},
{"plen", listing_psize, 0},
{"print", s_print, 0},
{"psize", listing_psize, 0}, /* Set paper size. */
{"purgem", s_purgem, 0},
{"quad", cons, 8},
{"rep", s_rept, 0},
{"rept", s_rept, 0},
{"rva", s_rva, 4},
{"sbttl", listing_title, 1}, /* Subtitle of listing. */
/* scl */
/* sect */
{"set", s_set, 0},
{"short", cons, 2},
{"single", float_cons, 'f'},
/* size */
{"space", s_space, 0},
{"skip", s_space, 0},
{"sleb128", s_leb128, 1},
{"spc", s_ignore, 0},
{"stabd", s_stab, 'd'},
{"stabn", s_stab, 'n'},
{"stabs", s_stab, 's'},
{"string", stringer, 1},
{"struct", s_struct, 0},
/* tag */
{"text", s_text, 0},
/* This is for gcc to use. It's only just been added (2/94), so gcc
won't be able to use it for a while -- probably a year or more.
But once this has been released, check with gcc maintainers
before deleting it or even changing the spelling. */
{"this_GCC_requires_the_GNU_assembler", s_ignore, 0},
/* If we're folding case -- done for some targets, not necessarily
all -- the above string in an input file will be converted to
this one. Match it either way... */
{"this_gcc_requires_the_gnu_assembler", s_ignore, 0},
{"title", listing_title, 0}, /* Listing title. */
{"ttl", listing_title, 0},
/* type */
{"uleb128", s_leb128, 0},
/* use */
/* val */
{"xcom", s_comm, 0},
{"xdef", s_globl, 0},
{"xref", s_ignore, 0},
{"xstabs", s_xstab, 's'},
{"warning", s_errwarn, 0},
{"word", cons, 2},
{"zero", s_space, 0},
{NULL, NULL, 0} /* End sentinel. */
};
static offsetT
get_absolute_expr (expressionS *exp)
{
expression_and_evaluate (exp);
if (exp->X_op != O_constant)
{
if (exp->X_op != O_absent)
as_bad (_("bad or irreducible absolute expression"));
exp->X_add_number = 0;
}
return exp->X_add_number;
}
offsetT
get_absolute_expression (void)
{
expressionS exp;
return get_absolute_expr (&exp);
}
static int pop_override_ok = 0;
static const char *pop_table_name;
void
pop_insert (const pseudo_typeS *table)
{
const char *errtxt;
const pseudo_typeS *pop;
for (pop = table; pop->poc_name; pop++)
{
errtxt = hash_insert (po_hash, pop->poc_name, (char *) pop);
if (errtxt && (!pop_override_ok || strcmp (errtxt, "exists")))
as_fatal (_("error constructing %s pseudo-op table: %s"), pop_table_name,
errtxt);
}
}
#ifndef md_pop_insert
#define md_pop_insert() pop_insert(md_pseudo_table)
#endif
#ifndef obj_pop_insert
#define obj_pop_insert() pop_insert(obj_pseudo_table)
#endif
#ifndef cfi_pop_insert
#define cfi_pop_insert() pop_insert(cfi_pseudo_table)
#endif
static void
pobegin (void)
{
po_hash = hash_new ();
/* Do the target-specific pseudo ops. */
pop_table_name = "md";
md_pop_insert ();
/* Now object specific. Skip any that were in the target table. */
pop_table_name = "obj";
pop_override_ok = 1;
obj_pop_insert ();
/* Now portable ones. Skip any that we've seen already. */
pop_table_name = "standard";
pop_insert (potable);
#ifdef TARGET_USE_CFIPOP
pop_table_name = "cfi";
pop_override_ok = 1;
cfi_pop_insert ();
#endif
}
#define HANDLE_CONDITIONAL_ASSEMBLY() \
if (ignore_input ()) \
{ \
char *eol = find_end_of_line (input_line_pointer, flag_m68k_mri); \
input_line_pointer = (input_line_pointer <= buffer_limit \
&& eol >= buffer_limit) \
? buffer_limit \
: eol + 1; \
continue; \
}
/* This function is used when scrubbing the characters between #APP
and #NO_APP. */
static char *scrub_string;
static char *scrub_string_end;
static int
scrub_from_string (char *buf, int buflen)
{
int copy;
copy = scrub_string_end - scrub_string;
if (copy > buflen)
copy = buflen;
memcpy (buf, scrub_string, copy);
scrub_string += copy;
return copy;
}
/* Helper function of read_a_source_file, which tries to expand a macro. */
static int
try_macro (char term, const char *line)
{
sb out;
const char *err;
macro_entry *macro;
if (check_macro (line, &out, &err, &macro))
{
if (err != NULL)
as_bad ("%s", err);
*input_line_pointer++ = term;
input_scrub_include_sb (&out,
input_line_pointer, 1);
sb_kill (&out);
buffer_limit =
input_scrub_next_buffer (&input_line_pointer);
#ifdef md_macro_info
md_macro_info (macro);
#endif
return 1;
}
return 0;
}
/* We read the file, putting things into a web that represents what we
have been reading. */
void
read_a_source_file (char *name)
{
register char c;
register char *s; /* String of symbol, '\0' appended. */
register int temp;
pseudo_typeS *pop;
#ifdef WARN_COMMENTS
found_comment = 0;
#endif
buffer = input_scrub_new_file (name);
listing_file (name);
listing_newline (NULL);
register_dependency (name);
/* Generate debugging information before we've read anything in to denote
this file as the "main" source file and not a subordinate one
(e.g. N_SO vs N_SOL in stabs). */
generate_file_debug ();
while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
{ /* We have another line to parse. */
#ifndef NO_LISTING
/* In order to avoid listing macro expansion lines with labels
multiple times, keep track of which line was last issued. */
static char *last_eol;
last_eol = NULL;
#endif
know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
while (input_line_pointer < buffer_limit)
{
/* We have more of this buffer to parse. */
/* We now have input_line_pointer->1st char of next line.
If input_line_pointer [-1] == '\n' then we just
scanned another line: so bump line counters. */
if (is_end_of_line[(unsigned char) input_line_pointer[-1]])
{
#ifdef md_start_line_hook
md_start_line_hook ();
#endif
if (input_line_pointer[-1] == '\n')
bump_line_counters ();
line_label = NULL;
if (LABELS_WITHOUT_COLONS || flag_m68k_mri)
{
/* Text at the start of a line must be a label, we
run down and stick a colon in. */
if (is_name_beginner (*input_line_pointer))
{
char *line_start = input_line_pointer;
char c;
int mri_line_macro;
LISTING_NEWLINE ();
HANDLE_CONDITIONAL_ASSEMBLY ();
c = get_symbol_end ();
/* In MRI mode, the EQU and MACRO pseudoops must
be handled specially. */
mri_line_macro = 0;
if (flag_m68k_mri)
{
char *rest = input_line_pointer + 1;
if (*rest == ':')
++rest;
if (*rest == ' ' || *rest == '\t')
++rest;
if ((strncasecmp (rest, "EQU", 3) == 0
|| strncasecmp (rest, "SET", 3) == 0)
&& (rest[3] == ' ' || rest[3] == '\t'))
{
input_line_pointer = rest + 3;
equals (line_start,
strncasecmp (rest, "SET", 3) == 0);
continue;
}
if (strncasecmp (rest, "MACRO", 5) == 0
&& (rest[5] == ' '
|| rest[5] == '\t'
|| is_end_of_line[(unsigned char) rest[5]]))
mri_line_macro = 1;
}
/* In MRI mode, we need to handle the MACRO
pseudo-op specially: we don't want to put the
symbol in the symbol table. */
if (!mri_line_macro
#ifdef TC_START_LABEL_WITHOUT_COLON
&& TC_START_LABEL_WITHOUT_COLON(c,
input_line_pointer)
#endif
)
line_label = colon (line_start);
else
line_label = symbol_create (line_start,
absolute_section,
(valueT) 0,
&zero_address_frag);
*input_line_pointer = c;
if (c == ':')
input_line_pointer++;
}
}
}
/* We are at the beginning of a line, or similar place.
We expect a well-formed assembler statement.
A "symbol-name:" is a statement.
Depending on what compiler is used, the order of these tests
may vary to catch most common case 1st.
Each test is independent of all other tests at the (top) level.
PLEASE make a compiler that doesn't use this assembler.
It is crufty to waste a compiler's time encoding things for this
assembler, which then wastes more time decoding it.
(And communicating via (linear) files is silly!
If you must pass stuff, please pass a tree!) */
if ((c = *input_line_pointer++) == '\t'
|| c == ' '
|| c == '\f'
|| c == 0)
c = *input_line_pointer++;
know (c != ' '); /* No further leading whitespace. */
#ifndef NO_LISTING
/* If listing is on, and we are expanding a macro, then give
the listing code the contents of the expanded line. */
if (listing)
{
if ((listing & LISTING_MACEXP) && macro_nest > 0)
{
char *copy;
int len;
/* Find the end of the current expanded macro line. */
s = find_end_of_line (input_line_pointer - 1, flag_m68k_mri);
if (s != last_eol)
{
last_eol = s;
/* Copy it for safe keeping. Also give an indication of
how much macro nesting is involved at this point. */
len = s - (input_line_pointer - 1);
copy = (char *) xmalloc (len + macro_nest + 2);
memset (copy, '>', macro_nest);
copy[macro_nest] = ' ';
memcpy (copy + macro_nest + 1, input_line_pointer - 1, len);
copy[macro_nest + 1 + len] = '\0';
/* Install the line with the listing facility. */
listing_newline (copy);
}
}
else
listing_newline (NULL);
}
#endif
/* C is the 1st significant character.
Input_line_pointer points after that character. */
if (is_name_beginner (c))
{
/* Want user-defined label or pseudo/opcode. */
HANDLE_CONDITIONAL_ASSEMBLY ();
s = --input_line_pointer;
c = get_symbol_end (); /* name's delimiter. */
/* C is character after symbol.
That character's place in the input line is now '\0'.
S points to the beginning of the symbol.
[In case of pseudo-op, s->'.'.]
Input_line_pointer->'\0' where c was. */
if (TC_START_LABEL (c, input_line_pointer))
{
if (flag_m68k_mri)
{
char *rest = input_line_pointer + 1;
/* In MRI mode, \tsym: set 0 is permitted. */
if (*rest == ':')
++rest;
if (*rest == ' ' || *rest == '\t')
++rest;
if ((strncasecmp (rest, "EQU", 3) == 0
|| strncasecmp (rest, "SET", 3) == 0)
&& (rest[3] == ' ' || rest[3] == '\t'))
{
input_line_pointer = rest + 3;
equals (s, 1);
continue;
}
}
line_label = colon (s); /* User-defined label. */
/* Put ':' back for error messages' sake. */
*input_line_pointer++ = ':';
#ifdef tc_check_label
tc_check_label (line_label);
#endif
/* Input_line_pointer->after ':'. */
SKIP_WHITESPACE ();
}
else if (input_line_pointer[1] == '='
&& (c == '='
|| ((c == ' ' || c == '\t')
&& input_line_pointer[2] == '=')))
{
equals (s, -1);
demand_empty_rest_of_line ();
}
else if ((c == '='
|| ((c == ' ' || c == '\t')
&& input_line_pointer[1] == '='))
#ifdef TC_EQUAL_IN_INSN
&& !TC_EQUAL_IN_INSN (c, s)
#endif
)
{
equals (s, 1);
demand_empty_rest_of_line ();
}
else
{
/* Expect pseudo-op or machine instruction. */
pop = NULL;
#ifndef TC_CASE_SENSITIVE
{
char *s2 = s;
strncpy (original_case_string, s2, sizeof (original_case_string));
original_case_string[sizeof (original_case_string) - 1] = 0;
while (*s2)
{
*s2 = TOLOWER (*s2);
s2++;
}
}
#endif
if (NO_PSEUDO_DOT || flag_m68k_mri)
{
/* The MRI assembler uses pseudo-ops without
a period. */
pop = (pseudo_typeS *) hash_find (po_hash, s);
if (pop != NULL && pop->poc_handler == NULL)
pop = NULL;
}
if (pop != NULL
|| (!flag_m68k_mri && *s == '.'))
{
/* PSEUDO - OP.
WARNING: c has next char, which may be end-of-line.
We lookup the pseudo-op table with s+1 because we
already know that the pseudo-op begins with a '.'. */
if (pop == NULL)
pop = (pseudo_typeS *) hash_find (po_hash, s + 1);
if (pop && !pop->poc_handler)
pop = NULL;
/* In MRI mode, we may need to insert an
automatic alignment directive. What a hack
this is. */
if (mri_pending_align
&& (pop == NULL
|| !((pop->poc_handler == cons
&& pop->poc_val == 1)
|| (pop->poc_handler == s_space
&& pop->poc_val == 1)
#ifdef tc_conditional_pseudoop
|| tc_conditional_pseudoop (pop)
#endif
|| pop->poc_handler == s_if
|| pop->poc_handler == s_ifdef
|| pop->poc_handler == s_ifc
|| pop->poc_handler == s_ifeqs
|| pop->poc_handler == s_else
|| pop->poc_handler == s_endif
|| pop->poc_handler == s_globl
|| pop->poc_handler == s_ignore)))
{
do_align (1, (char *) NULL, 0, 0);
mri_pending_align = 0;
if (line_label != NULL)
{
symbol_set_frag (line_label, frag_now);
S_SET_VALUE (line_label, frag_now_fix ());
}
}
/* Print the error msg now, while we still can. */
if (pop == NULL)
{
char *end = input_line_pointer;
*input_line_pointer = c;
s_ignore (0);
c = *--input_line_pointer;
*input_line_pointer = '\0';
if (! macro_defined || ! try_macro (c, s))
{
*end = '\0';
as_bad (_("unknown pseudo-op: `%s'"), s);
*input_line_pointer++ = c;
}
continue;
}
/* Put it back for error messages etc. */
*input_line_pointer = c;
/* The following skip of whitespace is compulsory.
A well shaped space is sometimes all that separates
keyword from operands. */
if (c == ' ' || c == '\t')
input_line_pointer++;
/* Input_line is restored.
Input_line_pointer->1st non-blank char
after pseudo-operation. */
(*pop->poc_handler) (pop->poc_val);
/* If that was .end, just get out now. */
if (pop->poc_handler == s_end)
goto quit;
}
else
{
/* WARNING: c has char, which may be end-of-line. */
/* Also: input_line_pointer->`\0` where c was. */
*input_line_pointer = c;
input_line_pointer = _find_end_of_line (input_line_pointer, flag_m68k_mri, 1);
c = *input_line_pointer;
*input_line_pointer = '\0';
generate_lineno_debug ();
if (macro_defined && try_macro (c, s))
continue;
if (mri_pending_align)
{
do_align (1, (char *) NULL, 0, 0);
mri_pending_align = 0;
if (line_label != NULL)
{
symbol_set_frag (line_label, frag_now);
S_SET_VALUE (line_label, frag_now_fix ());
}
}
md_assemble (s); /* Assemble 1 instruction. */
*input_line_pointer++ = c;
/* We resume loop AFTER the end-of-line from
this instruction. */
}
}
continue;
}
/* Empty statement? */
if (is_end_of_line[(unsigned char) c])
continue;
if ((LOCAL_LABELS_DOLLAR || LOCAL_LABELS_FB) && ISDIGIT (c))
{
/* local label ("4:") */
char *backup = input_line_pointer;
HANDLE_CONDITIONAL_ASSEMBLY ();
temp = c - '0';
/* Read the whole number. */
while (ISDIGIT (*input_line_pointer))
{
temp = (temp * 10) + *input_line_pointer - '0';
++input_line_pointer;
}
if (LOCAL_LABELS_DOLLAR
&& *input_line_pointer == '$'
&& *(input_line_pointer + 1) == ':')
{
input_line_pointer += 2;
if (dollar_label_defined (temp))
{
as_fatal (_("label \"%d$\" redefined"), temp);
}
define_dollar_label (temp);
colon (dollar_label_name (temp, 0));
continue;
}
if (LOCAL_LABELS_FB
&& *input_line_pointer++ == ':')
{
fb_label_instance_inc (temp);
colon (fb_label_name (temp, 0));
continue;
}
input_line_pointer = backup;
} /* local label ("4:") */
if (c && strchr (line_comment_chars, c))
{ /* Its a comment. Better say APP or NO_APP. */
sb sbuf;
char *ends;
char *new_buf;
char *new_tmp;
unsigned int new_length;
char *tmp_buf = 0;
bump_line_counters ();
s = input_line_pointer;
if (strncmp (s, "APP\n", 4))
continue; /* We ignore it */
s += 4;
sb_new (&sbuf);
ends = strstr (s, "#NO_APP\n");
if (!ends)
{
unsigned int tmp_len;
unsigned int num;
/* The end of the #APP wasn't in this buffer. We
keep reading in buffers until we find the #NO_APP
that goes with this #APP There is one. The specs
guarantee it... */
tmp_len = buffer_limit - s;
tmp_buf = xmalloc (tmp_len + 1);
memcpy (tmp_buf, s, tmp_len);
do
{
new_tmp = input_scrub_next_buffer (&buffer);
if (!new_tmp)
break;
else
buffer_limit = new_tmp;
input_line_pointer = buffer;
ends = strstr (buffer, "#NO_APP\n");
if (ends)
num = ends - buffer;
else
num = buffer_limit - buffer;
tmp_buf = xrealloc (tmp_buf, tmp_len + num);
memcpy (tmp_buf + tmp_len, buffer, num);
tmp_len += num;
}
while (!ends);
input_line_pointer = ends ? ends + 8 : NULL;
s = tmp_buf;
ends = s + tmp_len;
}
else
{
input_line_pointer = ends + 8;
}
scrub_string = s;
scrub_string_end = ends;
new_length = ends - s;
new_buf = (char *) xmalloc (new_length);
new_tmp = new_buf;
for (;;)
{
int space;
int size;
space = (new_buf + new_length) - new_tmp;
size = do_scrub_chars (scrub_from_string, new_tmp, space);
if (size < space)
{
new_tmp[size] = 0;
break;
}
new_buf = xrealloc (new_buf, new_length + 100);
new_tmp = new_buf + new_length;
new_length += 100;
}
if (tmp_buf)
free (tmp_buf);
/* We've "scrubbed" input to the preferred format. In the
process we may have consumed the whole of the remaining
file (and included files). We handle this formatted
input similar to that of macro expansion, letting
actual macro expansion (possibly nested) and other
input expansion work. Beware that in messages, line
numbers and possibly file names will be incorrect. */
sb_add_string (&sbuf, new_buf);
input_scrub_include_sb (&sbuf, input_line_pointer, 0);
sb_kill (&sbuf);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
free (new_buf);
continue;
}
HANDLE_CONDITIONAL_ASSEMBLY ();
#ifdef tc_unrecognized_line
if (tc_unrecognized_line (c))
continue;
#endif
input_line_pointer--;
/* Report unknown char as ignored. */
demand_empty_rest_of_line ();
}
#ifdef md_after_pass_hook
md_after_pass_hook ();
#endif
}
quit:
#ifdef md_cleanup
md_cleanup ();
#endif
/* Close the input file. */
input_scrub_close ();
#ifdef WARN_COMMENTS
{
if (warn_comment && found_comment)
as_warn_where (found_comment_file, found_comment,
"first comment found here");
}
#endif
}
/* Convert O_constant expression EXP into the equivalent O_big representation.
Take the sign of the number from X_unsigned rather than X_add_number. */
static void
convert_to_bignum (expressionS *exp)
{
valueT value;
unsigned int i;
value = exp->X_add_number;
for (i = 0; i < sizeof (exp->X_add_number) / CHARS_PER_LITTLENUM; i++)
{
generic_bignum[i] = value & LITTLENUM_MASK;
value >>= LITTLENUM_NUMBER_OF_BITS;
}
/* Add a sequence of sign bits if the top bit of X_add_number is not
the sign of the original value. */
if ((exp->X_add_number < 0) != !exp->X_unsigned)
generic_bignum[i++] = exp->X_unsigned ? 0 : LITTLENUM_MASK;
exp->X_op = O_big;
exp->X_add_number = i;
}
/* For most MRI pseudo-ops, the line actually ends at the first
nonquoted space. This function looks for that point, stuffs a null
in, and sets *STOPCP to the character that used to be there, and
returns the location.
Until I hear otherwise, I am going to assume that this is only true
for the m68k MRI assembler. */
char *
mri_comment_field (char *stopcp)
{
char *s;
#ifdef TC_M68K
int inquote = 0;
know (flag_m68k_mri);
for (s = input_line_pointer;
((!is_end_of_line[(unsigned char) *s] && *s != ' ' && *s != '\t')
|| inquote);
s++)
{
if (*s == '\'')
inquote = !inquote;
}
#else
for (s = input_line_pointer;
!is_end_of_line[(unsigned char) *s];
s++)
;
#endif
*stopcp = *s;
*s = '\0';
return s;
}
/* Skip to the end of an MRI comment field. */
void
mri_comment_end (char *stop, int stopc)
{
know (flag_mri);
input_line_pointer = stop;
*stop = stopc;
while (!is_end_of_line[(unsigned char) *input_line_pointer])
++input_line_pointer;
}
void
s_abort (int ignore ATTRIBUTE_UNUSED)
{
as_fatal (_(".abort detected. Abandoning ship."));
}
/* Guts of .align directive. N is the power of two to which to align.
FILL may be NULL, or it may point to the bytes of the fill pattern.
LEN is the length of whatever FILL points to, if anything. MAX is
the maximum number of characters to skip when doing the alignment,
or 0 if there is no maximum. */
static void
do_align (int n, char *fill, int len, int max)
{
if (now_seg == absolute_section)
{
if (fill != NULL)
while (len-- > 0)
if (*fill++ != '\0')
{
as_warn (_("ignoring fill value in absolute section"));
break;
}
fill = NULL;
len = 0;
}
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
#ifdef md_do_align
md_do_align (n, fill, len, max, just_record_alignment);
#endif
/* Only make a frag if we HAVE to... */
if (n != 0 && !need_pass_2)
{
if (fill == NULL)
{
if (subseg_text_p (now_seg))
frag_align_code (n, max);
else
frag_align (n, 0, max);
}
else if (len <= 1)
frag_align (n, *fill, max);
else
frag_align_pattern (n, fill, len, max);
}
#ifdef md_do_align
just_record_alignment: ATTRIBUTE_UNUSED_LABEL
#endif
record_alignment (now_seg, n - OCTETS_PER_BYTE_POWER);
}
/* Handle the .align pseudo-op. A positive ARG is a default alignment
(in bytes). A negative ARG is the negative of the length of the
fill pattern. BYTES_P is non-zero if the alignment value should be
interpreted as the byte boundary, rather than the power of 2. */
#define ALIGN_LIMIT (stdoutput->arch_info->bits_per_address - 1)
static void
s_align (int arg, int bytes_p)
{
unsigned int align_limit = ALIGN_LIMIT;
unsigned int align;
char *stop = NULL;
char stopc;
offsetT fill = 0;
int max;
int fill_p;
if (flag_mri)
stop = mri_comment_field (&stopc);
if (is_end_of_line[(unsigned char) *input_line_pointer])
{
if (arg < 0)
align = 0;
else
align = arg; /* Default value from pseudo-op table. */
}
else
{
align = get_absolute_expression ();
SKIP_WHITESPACE ();
}
if (bytes_p)
{
/* Convert to a power of 2. */
if (align != 0)
{
unsigned int i;
for (i = 0; (align & 1) == 0; align >>= 1, ++i)
;
if (align != 1)
as_bad (_("alignment not a power of 2"));
align = i;
}
}
if (align > align_limit)
{
align = align_limit;
as_warn (_("alignment too large: %u assumed"), align);
}
if (*input_line_pointer != ',')
{
fill_p = 0;
max = 0;
}
else
{
++input_line_pointer;
if (*input_line_pointer == ',')
fill_p = 0;
else
{
fill = get_absolute_expression ();
SKIP_WHITESPACE ();
fill_p = 1;
}
if (*input_line_pointer != ',')
max = 0;
else
{
++input_line_pointer;
max = get_absolute_expression ();
}
}
if (!fill_p)
{
if (arg < 0)
as_warn (_("expected fill pattern missing"));
do_align (align, (char *) NULL, 0, max);
}
else
{
int fill_len;
if (arg >= 0)
fill_len = 1;
else
fill_len = -arg;
if (fill_len <= 1)
{
char fill_char;
fill_char = fill;
do_align (align, &fill_char, fill_len, max);
}
else
{
char ab[16];
if ((size_t) fill_len > sizeof ab)
abort ();
md_number_to_chars (ab, fill, fill_len);
do_align (align, ab, fill_len, max);
}
}
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
/* Handle the .align pseudo-op on machines where ".align 4" means
align to a 4 byte boundary. */
void
s_align_bytes (int arg)
{
s_align (arg, 1);
}
/* Handle the .align pseudo-op on machines where ".align 4" means align
to a 2**4 boundary. */
void
s_align_ptwo (int arg)
{
s_align (arg, 0);
}
/* Switch in and out of alternate macro mode. */
void
s_altmacro (int on)
{
demand_empty_rest_of_line ();
macro_set_alternate (on);
}
symbolS *
s_comm_internal (int param,
symbolS *(*comm_parse_extra) (int, symbolS *, addressT))
{
char *name;
char c;
char *p;
offsetT temp, size;
symbolS *symbolP = NULL;
char *stop = NULL;
char stopc;
expressionS exp;
if (flag_mri)
stop = mri_comment_field (&stopc);
name = input_line_pointer;
c = get_symbol_end ();
/* Just after name is now '\0'. */
p = input_line_pointer;
*p = c;
if (name == p)
{
as_bad (_("expected symbol name"));
ignore_rest_of_line ();
goto out;
}
SKIP_WHITESPACE ();
/* Accept an optional comma after the name. The comma used to be
required, but Irix 5 cc does not generate it for .lcomm. */
if (*input_line_pointer == ',')
input_line_pointer++;
temp = get_absolute_expr (&exp);
size = temp;
size &= ((offsetT) 2 << (stdoutput->arch_info->bits_per_address - 1)) - 1;
if (exp.X_op == O_absent)
{
as_bad (_("missing size expression"));
ignore_rest_of_line ();
goto out;
}
else if (temp != size || !exp.X_unsigned)
{
as_warn (_("size (%ld) out of range, ignored"), (long) temp);
ignore_rest_of_line ();
goto out;
}
*p = 0;
symbolP = symbol_find_or_make (name);
if (S_IS_DEFINED (symbolP) && !S_IS_COMMON (symbolP))
{
symbolP = NULL;
as_bad (_("symbol `%s' is already defined"), name);
*p = c;
ignore_rest_of_line ();
goto out;
}
size = S_GET_VALUE (symbolP);
if (size == 0)
size = temp;
else if (size != temp)
as_warn (_("size of \"%s\" is already %ld; not changing to %ld"),
name, (long) size, (long) temp);
*p = c;
if (comm_parse_extra != NULL)
symbolP = (*comm_parse_extra) (param, symbolP, size);
else
{
S_SET_VALUE (symbolP, (valueT) size);
S_SET_EXTERNAL (symbolP);
#ifdef OBJ_VMS
{
extern int flag_one;
if (size == 0 || !flag_one)
S_GET_OTHER (symbolP) = const_flag;
}
#endif
}
demand_empty_rest_of_line ();
out:
if (flag_mri)
mri_comment_end (stop, stopc);
return symbolP;
}
void
s_comm (int ignore)
{
s_comm_internal (ignore, NULL);
}
/* The MRI COMMON pseudo-op. We handle this by creating a common
symbol with the appropriate name. We make s_space do the right
thing by increasing the size. */
void
s_mri_common (int small ATTRIBUTE_UNUSED)
{
char *name;
char c;
char *alc = NULL;
symbolS *sym;
offsetT align;
char *stop = NULL;
char stopc;
if (!flag_mri)
{
s_comm (0);
return;
}
stop = mri_comment_field (&stopc);
SKIP_WHITESPACE ();
name = input_line_pointer;
if (!ISDIGIT (*name))
c = get_symbol_end ();
else
{
do
{
++input_line_pointer;
}
while (ISDIGIT (*input_line_pointer));
c = *input_line_pointer;
*input_line_pointer = '\0';
if (line_label != NULL)
{
alc = (char *) xmalloc (strlen (S_GET_NAME (line_label))
+ (input_line_pointer - name)
+ 1);
sprintf (alc, "%s%s", name, S_GET_NAME (line_label));
name = alc;
}
}
sym = symbol_find_or_make (name);
*input_line_pointer = c;
if (alc != NULL)
free (alc);
if (*input_line_pointer != ',')
align = 0;
else
{
++input_line_pointer;
align = get_absolute_expression ();
}
if (S_IS_DEFINED (sym) && !S_IS_COMMON (sym))
{
as_bad (_("symbol `%s' is already defined"), S_GET_NAME (sym));
ignore_rest_of_line ();
mri_comment_end (stop, stopc);
return;
}
S_SET_EXTERNAL (sym);
mri_common_symbol = sym;
#ifdef S_SET_ALIGN
if (align != 0)
S_SET_ALIGN (sym, align);
#endif
if (line_label != NULL)
{
expressionS exp;
exp.X_op = O_symbol;
exp.X_add_symbol = sym;
exp.X_add_number = 0;
symbol_set_value_expression (line_label, &exp);
symbol_set_frag (line_label, &zero_address_frag);
S_SET_SEGMENT (line_label, expr_section);
}
/* FIXME: We just ignore the small argument, which distinguishes
COMMON and COMMON.S. I don't know what we can do about it. */
/* Ignore the type and hptype. */
if (*input_line_pointer == ',')
input_line_pointer += 2;
if (*input_line_pointer == ',')
input_line_pointer += 2;
demand_empty_rest_of_line ();
mri_comment_end (stop, stopc);
}
void
s_data (int ignore ATTRIBUTE_UNUSED)
{
segT section;
register int temp;
temp = get_absolute_expression ();
if (flag_readonly_data_in_text)
{
section = text_section;
temp += 1000;
}
else
section = data_section;
subseg_set (section, (subsegT) temp);
#ifdef OBJ_VMS
const_flag = 0;
#endif
demand_empty_rest_of_line ();
}
/* Handle the .appfile pseudo-op. This is automatically generated by
do_scrub_chars when a preprocessor # line comment is seen with a
file name. This default definition may be overridden by the object
or CPU specific pseudo-ops. This function is also the default
definition for .file; the APPFILE argument is 1 for .appfile, 0 for
.file. */
void
s_app_file_string (char *file, int appfile ATTRIBUTE_UNUSED)
{
#ifdef LISTING
if (listing)
listing_source_file (file);
#endif
register_dependency (file);
#ifdef obj_app_file
obj_app_file (file, appfile);
#endif
}
void
s_app_file (int appfile)
{
register char *s;
int length;
/* Some assemblers tolerate immediately following '"'. */
if ((s = demand_copy_string (&length)) != 0)
{
/* If this is a fake .appfile, a fake newline was inserted into
the buffer. Passing -2 to new_logical_line tells it to
account for it. */
int may_omit
= (!new_logical_line (s, appfile ? -2 : -1) && appfile);
/* In MRI mode, the preprocessor may have inserted an extraneous
backquote. */
if (flag_m68k_mri
&& *input_line_pointer == '\''
&& is_end_of_line[(unsigned char) input_line_pointer[1]])
++input_line_pointer;
demand_empty_rest_of_line ();
if (!may_omit)
s_app_file_string (s, appfile);
}
}
/* Handle the .appline pseudo-op. This is automatically generated by
do_scrub_chars when a preprocessor # line comment is seen. This
default definition may be overridden by the object or CPU specific
pseudo-ops. */
void
s_app_line (int ignore ATTRIBUTE_UNUSED)
{
int l;
/* The given number is that of the next line. */
l = get_absolute_expression () - 1;
if (l < -1)
/* Some of the back ends can't deal with non-positive line numbers.
Besides, it's silly. GCC however will generate a line number of
zero when it is pre-processing builtins for assembler-with-cpp files:
# 0 "<built-in>"
We do not want to barf on this, especially since such files are used
in the GCC and GDB testsuites. So we check for negative line numbers
rather than non-positive line numbers. */
as_warn (_("line numbers must be positive; line number %d rejected"),
l + 1);
else
{
new_logical_line ((char *) NULL, l);
#ifdef LISTING
if (listing)
listing_source_line (l);
#endif
}
demand_empty_rest_of_line ();
}
/* Handle the .end pseudo-op. Actually, the real work is done in
read_a_source_file. */
void
s_end (int ignore ATTRIBUTE_UNUSED)
{
if (flag_mri)
{
/* The MRI assembler permits the start symbol to follow .end,
but we don't support that. */
SKIP_WHITESPACE ();
if (!is_end_of_line[(unsigned char) *input_line_pointer]
&& *input_line_pointer != '*'
&& *input_line_pointer != '!')
as_warn (_("start address not supported"));
}
}
/* Handle the .err pseudo-op. */
void
s_err (int ignore ATTRIBUTE_UNUSED)
{
as_bad (_(".err encountered"));
demand_empty_rest_of_line ();
}
/* Handle the .error and .warning pseudo-ops. */
void
s_errwarn (int err)
{
int len;
/* The purpose for the conditional assignment is not to
internationalize the directive itself, but that we need a
self-contained message, one that can be passed like the
demand_copy_C_string return value, and with no assumption on the
location of the name of the directive within the message. */
char *msg
= (err ? _(".error directive invoked in source file")
: _(".warning directive invoked in source file"));
if (!is_it_end_of_statement ())
{
if (*input_line_pointer != '\"')
{
as_bad (_("%s argument must be a string"),
err ? ".error" : ".warning");
ignore_rest_of_line ();
return;
}
msg = demand_copy_C_string (&len);
if (msg == NULL)
return;
}
if (err)
as_bad ("%s", msg);
else
as_warn ("%s", msg);
demand_empty_rest_of_line ();
}
/* Handle the MRI fail pseudo-op. */
void
s_fail (int ignore ATTRIBUTE_UNUSED)
{
offsetT temp;
char *stop = NULL;
char stopc;
if (flag_mri)
stop = mri_comment_field (&stopc);
temp = get_absolute_expression ();
if (temp >= 500)
as_warn (_(".fail %ld encountered"), (long) temp);
else
as_bad (_(".fail %ld encountered"), (long) temp);
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
void
s_fill (int ignore ATTRIBUTE_UNUSED)
{
expressionS rep_exp;
long size = 1;
register long fill = 0;
char *p;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
get_known_segmented_expression (&rep_exp);
if (*input_line_pointer == ',')
{
input_line_pointer++;
size = get_absolute_expression ();
if (*input_line_pointer == ',')
{
input_line_pointer++;
fill = get_absolute_expression ();
}
}
/* This is to be compatible with BSD 4.2 AS, not for any rational reason. */
#define BSD_FILL_SIZE_CROCK_8 (8)
if (size > BSD_FILL_SIZE_CROCK_8)
{
as_warn (_(".fill size clamped to %d"), BSD_FILL_SIZE_CROCK_8);
size = BSD_FILL_SIZE_CROCK_8;
}
if (size < 0)
{
as_warn (_("size negative; .fill ignored"));
size = 0;
}
else if (rep_exp.X_op == O_constant && rep_exp.X_add_number <= 0)
{
if (rep_exp.X_add_number < 0)
as_warn (_("repeat < 0; .fill ignored"));
size = 0;
}
if (size && !need_pass_2)
{
if (rep_exp.X_op == O_constant)
{
p = frag_var (rs_fill, (int) size, (int) size,
(relax_substateT) 0, (symbolS *) 0,
(offsetT) rep_exp.X_add_number,
(char *) 0);
}
else
{
/* We don't have a constant repeat count, so we can't use
rs_fill. We can get the same results out of rs_space,
but its argument is in bytes, so we must multiply the
repeat count by size. */
symbolS *rep_sym;
rep_sym = make_expr_symbol (&rep_exp);
if (size != 1)
{
expressionS size_exp;
size_exp.X_op = O_constant;
size_exp.X_add_number = size;
rep_exp.X_op = O_multiply;
rep_exp.X_add_symbol = rep_sym;
rep_exp.X_op_symbol = make_expr_symbol (&size_exp);
rep_exp.X_add_number = 0;
rep_sym = make_expr_symbol (&rep_exp);
}
p = frag_var (rs_space, (int) size, (int) size,
(relax_substateT) 0, rep_sym, (offsetT) 0, (char *) 0);
}
memset (p, 0, (unsigned int) size);
/* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
flavoured AS. The following bizarre behaviour is to be
compatible with above. I guess they tried to take up to 8
bytes from a 4-byte expression and they forgot to sign
extend. */
#define BSD_FILL_SIZE_CROCK_4 (4)
md_number_to_chars (p, (valueT) fill,
(size > BSD_FILL_SIZE_CROCK_4
? BSD_FILL_SIZE_CROCK_4
: (int) size));
/* Note: .fill (),0 emits no frag (since we are asked to .fill 0 bytes)
but emits no error message because it seems a legal thing to do.
It is a degenerate case of .fill but could be emitted by a
compiler. */
}
demand_empty_rest_of_line ();
}
void
s_globl (int ignore ATTRIBUTE_UNUSED)
{
char *name;
int c;
symbolS *symbolP;
char *stop = NULL;
char stopc;
if (flag_mri)
stop = mri_comment_field (&stopc);
do
{
name = input_line_pointer;
c = get_symbol_end ();
symbolP = symbol_find_or_make (name);
S_SET_EXTERNAL (symbolP);
*input_line_pointer = c;
SKIP_WHITESPACE ();
c = *input_line_pointer;
if (c == ',')
{
input_line_pointer++;
SKIP_WHITESPACE ();
if (is_end_of_line[(unsigned char) *input_line_pointer])
c = '\n';
}
}
while (c == ',');
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
/* Handle the MRI IRP and IRPC pseudo-ops. */
void
s_irp (int irpc)
{
char *file, *eol;
unsigned int line;
sb s;
const char *err;
sb out;
as_where (&file, &line);
sb_new (&s);
eol = find_end_of_line (input_line_pointer, 0);
sb_add_buffer (&s, input_line_pointer, eol - input_line_pointer);
input_line_pointer = eol;
sb_new (&out);
err = expand_irp (irpc, 0, &s, &out, get_line_sb);
if (err != NULL)
as_bad_where (file, line, "%s", err);
sb_kill (&s);
input_scrub_include_sb (&out, input_line_pointer, 1);
sb_kill (&out);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Handle the .linkonce pseudo-op. This tells the assembler to mark
the section to only be linked once. However, this is not supported
by most object file formats. This takes an optional argument,
which is what to do about duplicates. */
void
s_linkonce (int ignore ATTRIBUTE_UNUSED)
{
enum linkonce_type type;
SKIP_WHITESPACE ();
type = LINKONCE_DISCARD;
if (!is_end_of_line[(unsigned char) *input_line_pointer])
{
char *s;
char c;
s = input_line_pointer;
c = get_symbol_end ();
if (strcasecmp (s, "discard") == 0)
type = LINKONCE_DISCARD;
else if (strcasecmp (s, "one_only") == 0)
type = LINKONCE_ONE_ONLY;
else if (strcasecmp (s, "same_size") == 0)
type = LINKONCE_SAME_SIZE;
else if (strcasecmp (s, "same_contents") == 0)
type = LINKONCE_SAME_CONTENTS;
else
as_warn (_("unrecognized .linkonce type `%s'"), s);
*input_line_pointer = c;
}
#ifdef obj_handle_link_once
obj_handle_link_once (type);
#else /* ! defined (obj_handle_link_once) */
{
flagword flags;
if ((bfd_applicable_section_flags (stdoutput) & SEC_LINK_ONCE) == 0)
as_warn (_(".linkonce is not supported for this object file format"));
flags = bfd_get_section_flags (stdoutput, now_seg);
flags |= SEC_LINK_ONCE;
switch (type)
{
default:
abort ();
case LINKONCE_DISCARD:
flags |= SEC_LINK_DUPLICATES_DISCARD;
break;
case LINKONCE_ONE_ONLY:
flags |= SEC_LINK_DUPLICATES_ONE_ONLY;
break;
case LINKONCE_SAME_SIZE:
flags |= SEC_LINK_DUPLICATES_SAME_SIZE;
break;
case LINKONCE_SAME_CONTENTS:
flags |= SEC_LINK_DUPLICATES_SAME_CONTENTS;
break;
}
if (!bfd_set_section_flags (stdoutput, now_seg, flags))
as_bad (_("bfd_set_section_flags: %s"),
bfd_errmsg (bfd_get_error ()));
}
#endif /* ! defined (obj_handle_link_once) */
demand_empty_rest_of_line ();
}
void
bss_alloc (symbolS *symbolP, addressT size, int align)
{
char *pfrag;
segT current_seg = now_seg;
subsegT current_subseg = now_subseg;
segT bss_seg = bss_section;
#if defined (TC_MIPS) || defined (TC_ALPHA)
if (OUTPUT_FLAVOR == bfd_target_ecoff_flavour
|| OUTPUT_FLAVOR == bfd_target_elf_flavour)
{
/* For MIPS and Alpha ECOFF or ELF, small objects are put in .sbss. */
if (size <= bfd_get_gp_size (stdoutput))
{
bss_seg = subseg_new (".sbss", 1);
seg_info (bss_seg)->bss = 1;
if (!bfd_set_section_flags (stdoutput, bss_seg, SEC_ALLOC))
as_warn (_("error setting flags for \".sbss\": %s"),
bfd_errmsg (bfd_get_error ()));
}
}
#endif
subseg_set (bss_seg, 1);
if (align)
{
record_alignment (bss_seg, align);
frag_align (align, 0, 0);
}
/* Detach from old frag. */
if (S_GET_SEGMENT (symbolP) == bss_seg)
symbol_get_frag (symbolP)->fr_symbol = NULL;
symbol_set_frag (symbolP, frag_now);
pfrag = frag_var (rs_org, 1, 1, 0, symbolP, size, NULL);
*pfrag = 0;
#ifdef S_SET_SIZE
S_SET_SIZE (symbolP, size);
#endif
S_SET_SEGMENT (symbolP, bss_seg);
#ifdef OBJ_COFF
/* The symbol may already have been created with a preceding
".globl" directive -- be careful not to step on storage class
in that case. Otherwise, set it to static. */
if (S_GET_STORAGE_CLASS (symbolP) != C_EXT)
S_SET_STORAGE_CLASS (symbolP, C_STAT);
#endif /* OBJ_COFF */
subseg_set (current_seg, current_subseg);
}
offsetT
parse_align (int align_bytes)
{
expressionS exp;
addressT align;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
no_align:
as_bad (_("expected alignment after size"));
ignore_rest_of_line ();
return -1;
}
input_line_pointer++;
SKIP_WHITESPACE ();
align = get_absolute_expr (&exp);
if (exp.X_op == O_absent)
goto no_align;
if (!exp.X_unsigned)
{
as_warn (_("alignment negative; 0 assumed"));
align = 0;
}
if (align_bytes && align != 0)
{
/* convert to a power of 2 alignment */
unsigned int alignp2 = 0;
while ((align & 1) == 0)
align >>= 1, ++alignp2;
if (align != 1)
{
as_bad (_("alignment not a power of 2"));
ignore_rest_of_line ();
return -1;
}
align = alignp2;
}
return align;
}
/* Called from s_comm_internal after symbol name and size have been
parsed. NEEDS_ALIGN is 0 if it was an ".lcomm" (2 args only),
1 if this was a ".bss" directive which has a 3rd argument
(alignment as a power of 2), or 2 if this was a ".bss" directive
with alignment in bytes. */
symbolS *
s_lcomm_internal (int needs_align, symbolS *symbolP, addressT size)
{
addressT align = 0;
if (needs_align)
{
align = parse_align (needs_align - 1);
if (align == (addressT) -1)
return NULL;
}
else
/* Assume some objects may require alignment on some systems. */
TC_IMPLICIT_LCOMM_ALIGNMENT (size, align);
bss_alloc (symbolP, size, align);
return symbolP;
}
void
s_lcomm (int needs_align)
{
s_comm_internal (needs_align, s_lcomm_internal);
}
void
s_lcomm_bytes (int needs_align)
{
s_comm_internal (needs_align * 2, s_lcomm_internal);
}
void
s_lsym (int ignore ATTRIBUTE_UNUSED)
{
register char *name;
register char c;
register char *p;
expressionS exp;
register symbolS *symbolP;
/* We permit ANY defined expression: BSD4.2 demands constants. */
name = input_line_pointer;
c = get_symbol_end ();
p = input_line_pointer;
*p = c;
if (name == p)
{
as_bad (_("expected symbol name"));
ignore_rest_of_line ();
return;
}
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
*p = 0;
as_bad (_("expected comma after \"%s\""), name);
*p = c;
ignore_rest_of_line ();
return;
}
input_line_pointer++;
expression_and_evaluate (&exp);
if (exp.X_op != O_constant
&& exp.X_op != O_register)
{
as_bad (_("bad expression"));
ignore_rest_of_line ();
return;
}
*p = 0;
symbolP = symbol_find_or_make (name);
/* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
symbolP->sy_desc == 0) out of this test because coff doesn't have
those fields, and I can't see when they'd ever be tripped. I
don't think I understand why they were here so I may have
introduced a bug. As recently as 1.37 didn't have this test
anyway. xoxorich. */
if (S_GET_SEGMENT (symbolP) == undefined_section
&& S_GET_VALUE (symbolP) == 0)
{
/* The name might be an undefined .global symbol; be sure to
keep the "external" bit. */
S_SET_SEGMENT (symbolP,
(exp.X_op == O_constant
? absolute_section
: reg_section));
S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
}
else
{
as_bad (_("symbol `%s' is already defined"), name);
}
*p = c;
demand_empty_rest_of_line ();
}
/* Read a line into an sb. Returns the character that ended the line
or zero if there are no more lines. */
static int
get_line_sb (sb *line)
{
char *eol;
if (input_line_pointer[-1] == '\n')
bump_line_counters ();
if (input_line_pointer >= buffer_limit)
{
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
if (buffer_limit == 0)
return 0;
}
eol = find_end_of_line (input_line_pointer, flag_m68k_mri);
sb_add_buffer (line, input_line_pointer, eol - input_line_pointer);
input_line_pointer = eol;
/* Don't skip multiple end-of-line characters, because that breaks support
for the IA-64 stop bit (;;) which looks like two consecutive end-of-line
characters but isn't. Instead just skip one end of line character and
return the character skipped so that the caller can re-insert it if
necessary. */
return *input_line_pointer++;
}
/* Define a macro. This is an interface to macro.c. */
void
s_macro (int ignore ATTRIBUTE_UNUSED)
{
char *file, *eol;
unsigned int line;
sb s;
const char *err;
const char *name;
as_where (&file, &line);
sb_new (&s);
eol = find_end_of_line (input_line_pointer, 0);
sb_add_buffer (&s, input_line_pointer, eol - input_line_pointer);
input_line_pointer = eol;
if (line_label != NULL)
{
sb label;
sb_new (&label);
sb_add_string (&label, S_GET_NAME (line_label));
err = define_macro (0, &s, &label, get_line_sb, file, line, &name);
sb_kill (&label);
}
else
err = define_macro (0, &s, NULL, get_line_sb, file, line, &name);
if (err != NULL)
as_bad_where (file, line, err, name);
else
{
if (line_label != NULL)
{
S_SET_SEGMENT (line_label, absolute_section);
S_SET_VALUE (line_label, 0);
symbol_set_frag (line_label, &zero_address_frag);
}
if (((NO_PSEUDO_DOT || flag_m68k_mri)
&& hash_find (po_hash, name) != NULL)
|| (!flag_m68k_mri
&& *name == '.'
&& hash_find (po_hash, name + 1) != NULL))
as_warn_where (file,
line,
_("attempt to redefine pseudo-op `%s' ignored"),
name);
}
sb_kill (&s);
}
/* Handle the .mexit pseudo-op, which immediately exits a macro
expansion. */
void
s_mexit (int ignore ATTRIBUTE_UNUSED)
{
cond_exit_macro (macro_nest);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Switch in and out of MRI mode. */
void
s_mri (int ignore ATTRIBUTE_UNUSED)
{
int on, old_flag;
on = get_absolute_expression ();
old_flag = flag_mri;
if (on != 0)
{
flag_mri = 1;
#ifdef TC_M68K
flag_m68k_mri = 1;
#endif
macro_mri_mode (1);
}
else
{
flag_mri = 0;
#ifdef TC_M68K
flag_m68k_mri = 0;
#endif
macro_mri_mode (0);
}
/* Operator precedence changes in m68k MRI mode, so we need to
update the operator rankings. */
expr_set_precedence ();
#ifdef MRI_MODE_CHANGE
if (on != old_flag)
MRI_MODE_CHANGE (on);
#endif
demand_empty_rest_of_line ();
}
/* Handle changing the location counter. */
static void
do_org (segT segment, expressionS *exp, int fill)
{
if (segment != now_seg && segment != absolute_section)
as_bad (_("invalid segment \"%s\""), segment_name (segment));
if (now_seg == absolute_section)
{
if (fill != 0)
as_warn (_("ignoring fill value in absolute section"));
if (exp->X_op != O_constant)
{
as_bad (_("only constant offsets supported in absolute section"));
exp->X_add_number = 0;
}
abs_section_offset = exp->X_add_number;
}
else
{
char *p;
symbolS *sym = exp->X_add_symbol;
offsetT off = exp->X_add_number * OCTETS_PER_BYTE;
if (exp->X_op != O_constant && exp->X_op != O_symbol)
{
/* Handle complex expressions. */
sym = make_expr_symbol (exp);
off = 0;
}
p = frag_var (rs_org, 1, 1, (relax_substateT) 0, sym, off, (char *) 0);
*p = fill;
}
}
void
s_org (int ignore ATTRIBUTE_UNUSED)
{
register segT segment;
expressionS exp;
register long temp_fill;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
/* The m68k MRI assembler has a different meaning for .org. It
means to create an absolute section at a given address. We can't
support that--use a linker script instead. */
if (flag_m68k_mri)
{
as_bad (_("MRI style ORG pseudo-op not supported"));
ignore_rest_of_line ();
return;
}
/* Don't believe the documentation of BSD 4.2 AS. There is no such
thing as a sub-segment-relative origin. Any absolute origin is
given a warning, then assumed to be segment-relative. Any
segmented origin expression ("foo+42") had better be in the right
segment or the .org is ignored.
BSD 4.2 AS warns if you try to .org backwards. We cannot because
we never know sub-segment sizes when we are reading code. BSD
will crash trying to emit negative numbers of filler bytes in
certain .orgs. We don't crash, but see as-write for that code.
Don't make frag if need_pass_2==1. */
segment = get_known_segmented_expression (&exp);
if (*input_line_pointer == ',')
{
input_line_pointer++;
temp_fill = get_absolute_expression ();
}
else
temp_fill = 0;
if (!need_pass_2)
do_org (segment, &exp, temp_fill);
demand_empty_rest_of_line ();
}
/* Handle parsing for the MRI SECT/SECTION pseudo-op. This should be
called by the obj-format routine which handles section changing
when in MRI mode. It will create a new section, and return it. It
will set *TYPE to the section type: one of 'C' (code), 'D' (data),
'M' (mixed), or 'R' (romable). The flags will be set in the section. */
void
s_mri_sect (char *type ATTRIBUTE_UNUSED)
{
#ifdef TC_M68K
char *name;
char c;
segT seg;
SKIP_WHITESPACE ();
name = input_line_pointer;
if (!ISDIGIT (*name))
c = get_symbol_end ();
else
{
do
{
++input_line_pointer;
}
while (ISDIGIT (*input_line_pointer));
c = *input_line_pointer;
*input_line_pointer = '\0';
}
name = xstrdup (name);
*input_line_pointer = c;
seg = subseg_new (name, 0);
if (*input_line_pointer == ',')
{
int align;
++input_line_pointer;
align = get_absolute_expression ();
record_alignment (seg, align);
}
*type = 'C';
if (*input_line_pointer == ',')
{
c = *++input_line_pointer;
c = TOUPPER (c);
if (c == 'C' || c == 'D' || c == 'M' || c == 'R')
*type = c;
else
as_bad (_("unrecognized section type"));
++input_line_pointer;
{
flagword flags;
flags = SEC_NO_FLAGS;
if (*type == 'C')
flags = SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE;
else if (*type == 'D' || *type == 'M')
flags = SEC_ALLOC | SEC_LOAD | SEC_DATA;
else if (*type == 'R')
flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_READONLY | SEC_ROM;
if (flags != SEC_NO_FLAGS)
{
if (!bfd_set_section_flags (stdoutput, seg, flags))
as_warn (_("error setting flags for \"%s\": %s"),
bfd_section_name (stdoutput, seg),
bfd_errmsg (bfd_get_error ()));
}
}
}
/* Ignore the HP type. */
if (*input_line_pointer == ',')
input_line_pointer += 2;
demand_empty_rest_of_line ();
#else /* ! TC_M68K */
#ifdef TC_I960
char *name;
char c;
segT seg;
SKIP_WHITESPACE ();
name = input_line_pointer;
c = get_symbol_end ();
name = xstrdup (name);
*input_line_pointer = c;
seg = subseg_new (name, 0);
if (*input_line_pointer != ',')
*type = 'C';
else
{
char *sectype;
++input_line_pointer;
SKIP_WHITESPACE ();
sectype = input_line_pointer;
c = get_symbol_end ();
if (*sectype == '\0')
*type = 'C';
else if (strcasecmp (sectype, "text") == 0)
*type = 'C';
else if (strcasecmp (sectype, "data") == 0)
*type = 'D';
else if (strcasecmp (sectype, "romdata") == 0)
*type = 'R';
else
as_warn (_("unrecognized section type `%s'"), sectype);
*input_line_pointer = c;
}
if (*input_line_pointer == ',')
{
char *seccmd;
++input_line_pointer;
SKIP_WHITESPACE ();
seccmd = input_line_pointer;
c = get_symbol_end ();
if (strcasecmp (seccmd, "absolute") == 0)
{
as_bad (_("absolute sections are not supported"));
*input_line_pointer = c;
ignore_rest_of_line ();
return;
}
else if (strcasecmp (seccmd, "align") == 0)
{
int align;
*input_line_pointer = c;
align = get_absolute_expression ();
record_alignment (seg, align);
}
else
{
as_warn (_("unrecognized section command `%s'"), seccmd);
*input_line_pointer = c;
}
}
demand_empty_rest_of_line ();
#else /* ! TC_I960 */
/* The MRI assembler seems to use different forms of .sect for
different targets. */
as_bad ("MRI mode not supported for this target");
ignore_rest_of_line ();
#endif /* ! TC_I960 */
#endif /* ! TC_M68K */
}
/* Handle the .print pseudo-op. */
void
s_print (int ignore ATTRIBUTE_UNUSED)
{
char *s;
int len;
s = demand_copy_C_string (&len);
if (s != NULL)
printf ("%s\n", s);
demand_empty_rest_of_line ();
}
/* Handle the .purgem pseudo-op. */
void
s_purgem (int ignore ATTRIBUTE_UNUSED)
{
if (is_it_end_of_statement ())
{
demand_empty_rest_of_line ();
return;
}
do
{
char *name;
char c;
SKIP_WHITESPACE ();
name = input_line_pointer;
c = get_symbol_end ();
delete_macro (name);
*input_line_pointer = c;
SKIP_WHITESPACE ();
}
while (*input_line_pointer++ == ',');
--input_line_pointer;
demand_empty_rest_of_line ();
}
/* Handle the .endm/.endr pseudo-ops. */
static void
s_bad_end (int endr)
{
as_warn (_(".end%c encountered without preceeding %s"),
endr ? 'r' : 'm',
endr ? ".rept, .irp, or .irpc" : ".macro");
demand_empty_rest_of_line ();
}
/* Handle the .rept pseudo-op. */
void
s_rept (int ignore ATTRIBUTE_UNUSED)
{
int count;
count = get_absolute_expression ();
do_repeat (count, "REPT", "ENDR");
}
/* This function provides a generic repeat block implementation. It allows
different directives to be used as the start/end keys. */
void
do_repeat (int count, const char *start, const char *end)
{
sb one;
sb many;
sb_new (&one);
if (!buffer_and_nest (start, end, &one, get_line_sb))
{
as_bad (_("%s without %s"), start, end);
return;
}
sb_new (&many);
while (count-- > 0)
sb_add_sb (&many, &one);
sb_kill (&one);
input_scrub_include_sb (&many, input_line_pointer, 1);
sb_kill (&many);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Skip to end of current repeat loop; EXTRA indicates how many additional
input buffers to skip. Assumes that conditionals preceding the loop end
are properly nested.
This function makes it easier to implement a premature "break" out of the
loop. The EXTRA arg accounts for other buffers we might have inserted,
such as line substitutions. */
void
end_repeat (int extra)
{
cond_exit_macro (macro_nest);
while (extra-- >= 0)
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
static void
assign_symbol (char *name, int mode)
{
symbolS *symbolP;
if (name[0] == '.' && name[1] == '\0')
{
/* Turn '. = mumble' into a .org mumble. */
segT segment;
expressionS exp;
segment = get_known_segmented_expression (&exp);
if (!need_pass_2)
do_org (segment, &exp, 0);
return;
}
if ((symbolP = symbol_find (name)) == NULL
&& (symbolP = md_undefined_symbol (name)) == NULL)
{
symbolP = symbol_find_or_make (name);
#ifndef NO_LISTING
/* When doing symbol listings, play games with dummy fragments living
outside the normal fragment chain to record the file and line info
for this symbol. */
if (listing & LISTING_SYMBOLS)
{
extern struct list_info_struct *listing_tail;
fragS *dummy_frag = (fragS *) xcalloc (1, sizeof (fragS));
dummy_frag->line = listing_tail;
dummy_frag->fr_symbol = symbolP;
symbol_set_frag (symbolP, dummy_frag);
}
#endif
#ifdef OBJ_COFF
/* "set" symbols are local unless otherwise specified. */
SF_SET_LOCAL (symbolP);
#endif
}
if (S_IS_DEFINED (symbolP))
{
/* Permit register names to be redefined. */
if ((mode != 0 || !S_IS_VOLATILE (symbolP))
&& S_GET_SEGMENT (symbolP) != reg_section)
{
as_bad (_("symbol `%s' is already defined"), name);
symbolP = symbol_clone (symbolP, 0);
}
/* If the symbol is volatile, copy the symbol and replace the
original with the copy, so that previous uses of the symbol will
retain the value of the symbol at the point of use. */
else if (S_IS_VOLATILE (symbolP)
/* This could be avoided when the symbol wasn't used so far, but
the comment in struc-symbol.h says this flag isn't reliable. */
&& (1 || symbol_used_p (symbolP)))
symbolP = symbol_clone (symbolP, 1);
}
if (mode == 0)
S_SET_VOLATILE (symbolP);
else if (mode < 0)
S_SET_FORWARD_REF (symbolP);
pseudo_set (symbolP);
}
/* Handle the .equ, .equiv, .eqv, and .set directives. If EQUIV is 1,
then this is .equiv, and it is an error if the symbol is already
defined. If EQUIV is -1, the symbol additionally is a forward
reference. */
void
s_set (int equiv)
{
char *name;
char delim;
char *end_name;
/* Especial apologies for the random logic:
this just grew, and could be parsed much more simply!
Dean in haste. */
name = input_line_pointer;
delim = get_symbol_end ();
end_name = input_line_pointer;
*end_name = delim;
if (name == end_name)
{
as_bad (_("expected symbol name"));
ignore_rest_of_line ();
return;
}
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
*end_name = 0;
as_bad (_("expected comma after \"%s\""), name);
*end_name = delim;
ignore_rest_of_line ();
return;
}
input_line_pointer++;
*end_name = 0;
assign_symbol (name, equiv);
*end_name = delim;
demand_empty_rest_of_line ();
}
void
s_space (int mult)
{
expressionS exp;
expressionS val;
char *p = 0;
char *stop = NULL;
char stopc;
int bytes;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
if (flag_mri)
stop = mri_comment_field (&stopc);
/* In m68k MRI mode, we need to align to a word boundary, unless
this is ds.b. */
if (flag_m68k_mri && mult > 1)
{
if (now_seg == absolute_section)
{
abs_section_offset += abs_section_offset & 1;
if (line_label != NULL)
S_SET_VALUE (line_label, abs_section_offset);
}
else if (mri_common_symbol != NULL)
{
valueT val;
val = S_GET_VALUE (mri_common_symbol);
if ((val & 1) != 0)
{
S_SET_VALUE (mri_common_symbol, val + 1);
if (line_label != NULL)
{
expressionS *symexp;
symexp = symbol_get_value_expression (line_label);
know (symexp->X_op == O_symbol);
know (symexp->X_add_symbol == mri_common_symbol);
symexp->X_add_number += 1;
}
}
}
else
{
do_align (1, (char *) NULL, 0, 0);
if (line_label != NULL)
{
symbol_set_frag (line_label, frag_now);
S_SET_VALUE (line_label, frag_now_fix ());
}
}
}
bytes = mult;
expression (&exp);
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
{
++input_line_pointer;
expression (&val);
}
else
{
val.X_op = O_constant;
val.X_add_number = 0;
}
if (val.X_op != O_constant
|| val.X_add_number < - 0x80
|| val.X_add_number > 0xff
|| (mult != 0 && mult != 1 && val.X_add_number != 0))
{
resolve_expression (&exp);
if (exp.X_op != O_constant)
as_bad (_("unsupported variable size or fill value"));
else
{
offsetT i;
if (mult == 0)
mult = 1;
bytes = mult * exp.X_add_number;
for (i = 0; i < exp.X_add_number; i++)
emit_expr (&val, mult);
}
}
else
{
if (now_seg == absolute_section || mri_common_symbol != NULL)
resolve_expression (&exp);
if (exp.X_op == O_constant)
{
long repeat;
repeat = exp.X_add_number;
if (mult)
repeat *= mult;
bytes = repeat;
if (repeat <= 0)
{
if (!flag_mri)
as_warn (_(".space repeat count is zero, ignored"));
else if (repeat < 0)
as_warn (_(".space repeat count is negative, ignored"));
goto getout;
}
/* If we are in the absolute section, just bump the offset. */
if (now_seg == absolute_section)
{
abs_section_offset += repeat;
goto getout;
}
/* If we are secretly in an MRI common section, then
creating space just increases the size of the common
symbol. */
if (mri_common_symbol != NULL)
{
S_SET_VALUE (mri_common_symbol,
S_GET_VALUE (mri_common_symbol) + repeat);
goto getout;
}
if (!need_pass_2)
p = frag_var (rs_fill, 1, 1, (relax_substateT) 0, (symbolS *) 0,
(offsetT) repeat, (char *) 0);
}
else
{
if (now_seg == absolute_section)
{
as_bad (_("space allocation too complex in absolute section"));
subseg_set (text_section, 0);
}
if (mri_common_symbol != NULL)
{
as_bad (_("space allocation too complex in common section"));
mri_common_symbol = NULL;
}
if (!need_pass_2)
p = frag_var (rs_space, 1, 1, (relax_substateT) 0,
make_expr_symbol (&exp), (offsetT) 0, (char *) 0);
}
if (p)
*p = val.X_add_number;
}
getout:
/* In MRI mode, after an odd number of bytes, we must align to an
even word boundary, unless the next instruction is a dc.b, ds.b
or dcb.b. */
if (flag_mri && (bytes & 1) != 0)
mri_pending_align = 1;
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
/* This is like s_space, but the value is a floating point number with
the given precision. This is for the MRI dcb.s pseudo-op and
friends. */
void
s_float_space (int float_type)
{
offsetT count;
int flen;
char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
char *stop = NULL;
char stopc;
if (flag_mri)
stop = mri_comment_field (&stopc);
count = get_absolute_expression ();
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
as_bad (_("missing value"));
ignore_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
return;
}
++input_line_pointer;
SKIP_WHITESPACE ();
/* Skip any 0{letter} that may be present. Don't even check if the
* letter is legal. */
if (input_line_pointer[0] == '0'
&& ISALPHA (input_line_pointer[1]))
input_line_pointer += 2;
/* Accept :xxxx, where the x's are hex digits, for a floating point
with the exact digits specified. */
if (input_line_pointer[0] == ':')
{
flen = hex_float (float_type, temp);
if (flen < 0)
{
ignore_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
return;
}
}
else
{
char *err;
err = md_atof (float_type, temp, &flen);
know (flen <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
know (flen > 0);
if (err)
{
as_bad (_("bad floating literal: %s"), err);
ignore_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
return;
}
}
while (--count >= 0)
{
char *p;
p = frag_more (flen);
memcpy (p, temp, (unsigned int) flen);
}
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
/* Handle the .struct pseudo-op, as found in MIPS assemblers. */
void
s_struct (int ignore ATTRIBUTE_UNUSED)
{
char *stop = NULL;
char stopc;
if (flag_mri)
stop = mri_comment_field (&stopc);
abs_section_offset = get_absolute_expression ();
subseg_set (absolute_section, 0);
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
void
s_text (int ignore ATTRIBUTE_UNUSED)
{
register int temp;
temp = get_absolute_expression ();
subseg_set (text_section, (subsegT) temp);
demand_empty_rest_of_line ();
#ifdef OBJ_VMS
const_flag &= ~IN_DEFAULT_SECTION;
#endif
}
/* Verify that we are at the end of a line. If not, issue an error and
skip to EOL. */
void
demand_empty_rest_of_line (void)
{
SKIP_WHITESPACE ();
if (is_end_of_line[(unsigned char) *input_line_pointer])
input_line_pointer++;
else
{
if (ISPRINT (*input_line_pointer))
as_bad (_("junk at end of line, first unrecognized character is `%c'"),
*input_line_pointer);
else
as_bad (_("junk at end of line, first unrecognized character valued 0x%x"),
*input_line_pointer);
ignore_rest_of_line ();
}
/* Return pointing just after end-of-line. */
know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
}
/* Silently advance to the end of line. Use this after already having
issued an error about something bad. */
void
ignore_rest_of_line (void)
{
while (input_line_pointer < buffer_limit
&& !is_end_of_line[(unsigned char) *input_line_pointer])
input_line_pointer++;
input_line_pointer++;
/* Return pointing just after end-of-line. */
know (is_end_of_line[(unsigned char) input_line_pointer[-1]]);
}
/* Sets frag for given symbol to zero_address_frag, except when the
symbol frag is already set to a dummy listing frag. */
static void
set_zero_frag (symbolS *symbolP)
{
if (symbol_get_frag (symbolP)->fr_type != rs_dummy)
symbol_set_frag (symbolP, &zero_address_frag);
}
/* In: Pointer to a symbol.
Input_line_pointer->expression.
Out: Input_line_pointer->just after any whitespace after expression.
Tried to set symbol to value of expression.
Will change symbols type, value, and frag; */
void
pseudo_set (symbolS *symbolP)
{
expressionS exp;
segT seg;
know (symbolP); /* NULL pointer is logic error. */
if (!S_IS_FORWARD_REF (symbolP))
(void) expression (&exp);
else
(void) deferred_expression (&exp);
if (exp.X_op == O_illegal)
as_bad (_("illegal expression"));
else if (exp.X_op == O_absent)
as_bad (_("missing expression"));
else if (exp.X_op == O_big)
{
if (exp.X_add_number > 0)
as_bad (_("bignum invalid"));
else
as_bad (_("floating point number invalid"));
}
else if (exp.X_op == O_subtract
&& !S_IS_FORWARD_REF (symbolP)
&& SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
&& (symbol_get_frag (exp.X_add_symbol)
== symbol_get_frag (exp.X_op_symbol)))
{
exp.X_op = O_constant;
exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
- S_GET_VALUE (exp.X_op_symbol));
}
if (symbol_section_p (symbolP))
{
as_bad ("attempt to set value of section symbol");
return;
}
switch (exp.X_op)
{
case O_illegal:
case O_absent:
case O_big:
exp.X_add_number = 0;
/* Fall through. */
case O_constant:
S_SET_SEGMENT (symbolP, absolute_section);
S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
set_zero_frag (symbolP);
break;
case O_register:
S_SET_SEGMENT (symbolP, reg_section);
S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
set_zero_frag (symbolP);
break;
case O_symbol:
seg = S_GET_SEGMENT (exp.X_add_symbol);
/* For x=undef+const, create an expression symbol.
For x=x+const, just update x except when x is an undefined symbol
For x=defined+const, evaluate x. */
if (symbolP == exp.X_add_symbol
&& (seg != undefined_section
|| !symbol_constant_p (symbolP)))
{
*symbol_X_add_number (symbolP) += exp.X_add_number;
break;
}
else if (!S_IS_FORWARD_REF (symbolP) && seg != undefined_section)
{
symbolS *s = exp.X_add_symbol;
if (S_IS_COMMON (s))
as_bad (_("`%s' can't be equated to common symbol '%s'"),
S_GET_NAME (symbolP), S_GET_NAME (s));
S_SET_SEGMENT (symbolP, seg);
S_SET_VALUE (symbolP, exp.X_add_number + S_GET_VALUE (s));
symbol_set_frag (symbolP, symbol_get_frag (s));
copy_symbol_attributes (symbolP, s);
break;
}
S_SET_SEGMENT (symbolP, undefined_section);
symbol_set_value_expression (symbolP, &exp);
set_zero_frag (symbolP);
break;
default:
/* The value is some complex expression. */
S_SET_SEGMENT (symbolP, expr_section);
symbol_set_value_expression (symbolP, &exp);
set_zero_frag (symbolP);
break;
}
}
/* cons()
CONStruct more frag of .bytes, or .words etc.
Should need_pass_2 be 1 then emit no frag(s).
This understands EXPRESSIONS.
Bug (?)
This has a split personality. We use expression() to read the
value. We can detect if the value won't fit in a byte or word.
But we can't detect if expression() discarded significant digits
in the case of a long. Not worth the crocks required to fix it. */
/* Select a parser for cons expressions. */
/* Some targets need to parse the expression in various fancy ways.
You can define TC_PARSE_CONS_EXPRESSION to do whatever you like
(for example, the HPPA does this). Otherwise, you can define
BITFIELD_CONS_EXPRESSIONS to permit bitfields to be specified, or
REPEAT_CONS_EXPRESSIONS to permit repeat counts. If none of these
are defined, which is the normal case, then only simple expressions
are permitted. */
#ifdef TC_M68K
static void
parse_mri_cons (expressionS *exp, unsigned int nbytes);
#endif
#ifndef TC_PARSE_CONS_EXPRESSION
#ifdef BITFIELD_CONS_EXPRESSIONS
#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_bitfield_cons (EXP, NBYTES)
static void
parse_bitfield_cons (expressionS *exp, unsigned int nbytes);
#endif
#ifdef REPEAT_CONS_EXPRESSIONS
#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) parse_repeat_cons (EXP, NBYTES)
static void
parse_repeat_cons (expressionS *exp, unsigned int nbytes);
#endif
/* If we haven't gotten one yet, just call expression. */
#ifndef TC_PARSE_CONS_EXPRESSION
#define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) expression (EXP)
#endif
#endif
void
do_parse_cons_expression (expressionS *exp,
int nbytes ATTRIBUTE_UNUSED)
{
TC_PARSE_CONS_EXPRESSION (exp, nbytes);
}
/* Worker to do .byte etc statements.
Clobbers input_line_pointer and checks end-of-line. */
static void
cons_worker (register int nbytes, /* 1=.byte, 2=.word, 4=.long. */
int rva)
{
int c;
expressionS exp;
char *stop = NULL;
char stopc;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
if (flag_mri)
stop = mri_comment_field (&stopc);
if (is_it_end_of_statement ())
{
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
return;
}
#ifdef TC_ADDRESS_BYTES
if (nbytes == 0)
nbytes = TC_ADDRESS_BYTES ();
#endif
#ifdef md_cons_align
md_cons_align (nbytes);
#endif
c = 0;
do
{
#ifdef TC_M68K
if (flag_m68k_mri)
parse_mri_cons (&exp, (unsigned int) nbytes);
else
#endif
TC_PARSE_CONS_EXPRESSION (&exp, (unsigned int) nbytes);
if (rva)
{
if (exp.X_op == O_symbol)
exp.X_op = O_symbol_rva;
else
as_fatal (_("rva without symbol"));
}
emit_expr (&exp, (unsigned int) nbytes);
++c;
}
while (*input_line_pointer++ == ',');
/* In MRI mode, after an odd number of bytes, we must align to an
even word boundary, unless the next instruction is a dc.b, ds.b
or dcb.b. */
if (flag_mri && nbytes == 1 && (c & 1) != 0)
mri_pending_align = 1;
input_line_pointer--; /* Put terminator back into stream. */
demand_empty_rest_of_line ();
if (flag_mri)
mri_comment_end (stop, stopc);
}
void
cons (int size)
{
cons_worker (size, 0);
}
void
s_rva (int size)
{
cons_worker (size, 1);
}
/* Put the contents of expression EXP into the object file using
NBYTES bytes. If need_pass_2 is 1, this does nothing. */
void
emit_expr (expressionS *exp, unsigned int nbytes)
{
operatorT op;
register char *p;
valueT extra_digit = 0;
/* Don't do anything if we are going to make another pass. */
if (need_pass_2)
return;
dot_value = frag_now_fix ();
#ifndef NO_LISTING
#ifdef OBJ_ELF
/* When gcc emits DWARF 1 debugging pseudo-ops, a line number will
appear as a four byte positive constant in the .line section,
followed by a 2 byte 0xffff. Look for that case here. */
{
static int dwarf_line = -1;
if (strcmp (segment_name (now_seg), ".line") != 0)
dwarf_line = -1;
else if (dwarf_line >= 0
&& nbytes == 2
&& exp->X_op == O_constant
&& (exp->X_add_number == -1 || exp->X_add_number == 0xffff))
listing_source_line ((unsigned int) dwarf_line);
else if (nbytes == 4
&& exp->X_op == O_constant
&& exp->X_add_number >= 0)
dwarf_line = exp->X_add_number;
else
dwarf_line = -1;
}
/* When gcc emits DWARF 1 debugging pseudo-ops, a file name will
appear as a 2 byte TAG_compile_unit (0x11) followed by a 2 byte
AT_sibling (0x12) followed by a four byte address of the sibling
followed by a 2 byte AT_name (0x38) followed by the name of the
file. We look for that case here. */
{
static int dwarf_file = 0;
if (strcmp (segment_name (now_seg), ".debug") != 0)
dwarf_file = 0;
else if (dwarf_file == 0
&& nbytes == 2
&& exp->X_op == O_constant
&& exp->X_add_number == 0x11)
dwarf_file = 1;
else if (dwarf_file == 1
&& nbytes == 2
&& exp->X_op == O_constant
&& exp->X_add_number == 0x12)
dwarf_file = 2;
else if (dwarf_file == 2
&& nbytes == 4)
dwarf_file = 3;
else if (dwarf_file == 3
&& nbytes == 2
&& exp->X_op == O_constant
&& exp->X_add_number == 0x38)
dwarf_file = 4;
else
dwarf_file = 0;
/* The variable dwarf_file_string tells stringer that the string
may be the name of the source file. */
if (dwarf_file == 4)
dwarf_file_string = 1;
else
dwarf_file_string = 0;
}
#endif
#endif
if (check_eh_frame (exp, &nbytes))
return;
op = exp->X_op;
/* Allow `.word 0' in the absolute section. */
if (now_seg == absolute_section)
{
if (op != O_constant || exp->X_add_number != 0)
as_bad (_("attempt to store value in absolute section"));
abs_section_offset += nbytes;
return;
}
/* Handle a negative bignum. */
if (op == O_uminus
&& exp->X_add_number == 0
&& symbol_get_value_expression (exp->X_add_symbol)->X_op == O_big
&& symbol_get_value_expression (exp->X_add_symbol)->X_add_number > 0)
{
int i;
unsigned long carry;
exp = symbol_get_value_expression (exp->X_add_symbol);
/* Negate the bignum: one's complement each digit and add 1. */
carry = 1;
for (i = 0; i < exp->X_add_number; i++)
{
unsigned long next;
next = (((~(generic_bignum[i] & LITTLENUM_MASK))
& LITTLENUM_MASK)
+ carry);
generic_bignum[i] = next & LITTLENUM_MASK;
carry = next >> LITTLENUM_NUMBER_OF_BITS;
}
/* We can ignore any carry out, because it will be handled by
extra_digit if it is needed. */
extra_digit = (valueT) -1;
op = O_big;
}
if (op == O_absent || op == O_illegal)
{
as_warn (_("zero assumed for missing expression"));
exp->X_add_number = 0;
op = O_constant;
}
else if (op == O_big && exp->X_add_number <= 0)
{
as_bad (_("floating point number invalid"));
exp->X_add_number = 0;
op = O_constant;
}
else if (op == O_register)
{
as_warn (_("register value used as expression"));
op = O_constant;
}
p = frag_more ((int) nbytes);
#ifndef WORKING_DOT_WORD
/* If we have the difference of two symbols in a word, save it on
the broken_words list. See the code in write.c. */
if (op == O_subtract && nbytes == 2)
{
struct broken_word *x;
x = (struct broken_word *) xmalloc (sizeof (struct broken_word));
x->next_broken_word = broken_words;
broken_words = x;
x->seg = now_seg;
x->subseg = now_subseg;
x->frag = frag_now;
x->word_goes_here = p;
x->dispfrag = 0;
x->add = exp->X_add_symbol;
x->sub = exp->X_op_symbol;
x->addnum = exp->X_add_number;
x->added = 0;
x->use_jump = 0;
new_broken_words++;
return;
}
#endif
/* If we have an integer, but the number of bytes is too large to
pass to md_number_to_chars, handle it as a bignum. */
if (op == O_constant && nbytes > sizeof (valueT))
{
extra_digit = exp->X_unsigned ? 0 : -1;
convert_to_bignum (exp);
op = O_big;
}
if (op == O_constant)
{
register valueT get;
register valueT use;
register valueT mask;
valueT hibit;
register valueT unmask;
/* JF << of >= number of bits in the object is undefined. In
particular SPARC (Sun 4) has problems. */
if (nbytes >= sizeof (valueT))
{
mask = 0;
if (nbytes > sizeof (valueT))
hibit = 0;
else
hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1);
}
else
{
/* Don't store these bits. */
mask = ~(valueT) 0 << (BITS_PER_CHAR * nbytes);
hibit = (valueT) 1 << (nbytes * BITS_PER_CHAR - 1);
}
unmask = ~mask; /* Do store these bits. */
#ifdef NEVER
"Do this mod if you want every overflow check to assume SIGNED 2's complement data.";
mask = ~(unmask >> 1); /* Includes sign bit now. */
#endif
get = exp->X_add_number;
use = get & unmask;
if ((get & mask) != 0
&& ((get & mask) != mask
|| (get & hibit) == 0))
{ /* Leading bits contain both 0s & 1s. */
as_warn (_("value 0x%lx truncated to 0x%lx"),
(unsigned long) get, (unsigned long) use);
}
/* Put bytes in right order. */
md_number_to_chars (p, use, (int) nbytes);
}
else if (op == O_big)
{
unsigned int size;
LITTLENUM_TYPE *nums;
know (nbytes % CHARS_PER_LITTLENUM == 0);
size = exp->X_add_number * CHARS_PER_LITTLENUM;
if (nbytes < size)
{
as_warn (_("bignum truncated to %d bytes"), nbytes);
size = nbytes;
}
if (target_big_endian)
{
while (nbytes > size)
{
md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
nbytes -= CHARS_PER_LITTLENUM;
p += CHARS_PER_LITTLENUM;
}
nums = generic_bignum + size / CHARS_PER_LITTLENUM;
while (size >= CHARS_PER_LITTLENUM)
{
--nums;
md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
size -= CHARS_PER_LITTLENUM;
p += CHARS_PER_LITTLENUM;
}
}
else
{
nums = generic_bignum;
while (size >= CHARS_PER_LITTLENUM)
{
md_number_to_chars (p, (valueT) *nums, CHARS_PER_LITTLENUM);
++nums;
size -= CHARS_PER_LITTLENUM;
p += CHARS_PER_LITTLENUM;
nbytes -= CHARS_PER_LITTLENUM;
}
while (nbytes >= CHARS_PER_LITTLENUM)
{
md_number_to_chars (p, extra_digit, CHARS_PER_LITTLENUM);
nbytes -= CHARS_PER_LITTLENUM;
p += CHARS_PER_LITTLENUM;
}
}
}
else
{
memset (p, 0, nbytes);
/* Now we need to generate a fixS to record the symbol value. */
#ifdef TC_CONS_FIX_NEW
TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
#else
{
bfd_reloc_code_real_type r;
switch (nbytes)
{
case 1:
r = BFD_RELOC_8;
break;
case 2:
r = BFD_RELOC_16;
break;
case 4:
r = BFD_RELOC_32;
break;
case 8:
r = BFD_RELOC_64;
break;
default:
as_bad (_("unsupported BFD relocation size %u"), nbytes);
r = BFD_RELOC_32;
break;
}
fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp,
0, r);
}
#endif
}
}
#ifdef BITFIELD_CONS_EXPRESSIONS
/* i960 assemblers, (eg, asm960), allow bitfields after ".byte" as
w:x,y:z, where w and y are bitwidths and x and y are values. They
then pack them all together. We do a little better in that we allow
them in words, longs, etc. and we'll pack them in target byte order
for you.
The rules are: pack least significant bit first, if a field doesn't
entirely fit, put it in the next unit. Overflowing the bitfield is
explicitly *not* even a warning. The bitwidth should be considered
a "mask".
To use this function the tc-XXX.h file should define
BITFIELD_CONS_EXPRESSIONS. */
static void
parse_bitfield_cons (exp, nbytes)
expressionS *exp;
unsigned int nbytes;
{
unsigned int bits_available = BITS_PER_CHAR * nbytes;
char *hold = input_line_pointer;
(void) expression (exp);
if (*input_line_pointer == ':')
{
/* Bitfields. */
long value = 0;
for (;;)
{
unsigned long width;
if (*input_line_pointer != ':')
{
input_line_pointer = hold;
break;
} /* Next piece is not a bitfield. */
/* In the general case, we can't allow
full expressions with symbol
differences and such. The relocation
entries for symbols not defined in this
assembly would require arbitrary field
widths, positions, and masks which most
of our current object formats don't
support.
In the specific case where a symbol
*is* defined in this assembly, we
*could* build fixups and track it, but
this could lead to confusion for the
backends. I'm lazy. I'll take any
SEG_ABSOLUTE. I think that means that
you can use a previous .set or
.equ type symbol. xoxorich. */
if (exp->X_op == O_absent)
{
as_warn (_("using a bit field width of zero"));
exp->X_add_number = 0;
exp->X_op = O_constant;
} /* Implied zero width bitfield. */
if (exp->X_op != O_constant)
{
*input_line_pointer = '\0';
as_bad (_("field width \"%s\" too complex for a bitfield"), hold);
*input_line_pointer = ':';
demand_empty_rest_of_line ();
return;
} /* Too complex. */
if ((width = exp->X_add_number) > (BITS_PER_CHAR * nbytes))
{
as_warn (_("field width %lu too big to fit in %d bytes: truncated to %d bits"),
width, nbytes, (BITS_PER_CHAR * nbytes));
width = BITS_PER_CHAR * nbytes;
} /* Too big. */
if (width > bits_available)
{
/* FIXME-SOMEDAY: backing up and reparsing is wasteful. */
input_line_pointer = hold;
exp->X_add_number = value;
break;
} /* Won't fit. */
/* Skip ':'. */
hold = ++input_line_pointer;
(void) expression (exp);
if (exp->X_op != O_constant)
{
char cache = *input_line_pointer;
*input_line_pointer = '\0';
as_bad (_("field value \"%s\" too complex for a bitfield"), hold);
*input_line_pointer = cache;
demand_empty_rest_of_line ();
return;
} /* Too complex. */
value |= ((~(-1 << width) & exp->X_add_number)
<< ((BITS_PER_CHAR * nbytes) - bits_available));
if ((bits_available -= width) == 0
|| is_it_end_of_statement ()
|| *input_line_pointer != ',')
{
break;
} /* All the bitfields we're gonna get. */
hold = ++input_line_pointer;
(void) expression (exp);
}
exp->X_add_number = value;
exp->X_op = O_constant;
exp->X_unsigned = 1;
}
}
#endif /* BITFIELD_CONS_EXPRESSIONS */
/* Handle an MRI style string expression. */
#ifdef TC_M68K
static void
parse_mri_cons (exp, nbytes)
expressionS *exp;
unsigned int nbytes;
{
if (*input_line_pointer != '\''
&& (input_line_pointer[1] != '\''
|| (*input_line_pointer != 'A'
&& *input_line_pointer != 'E')))
TC_PARSE_CONS_EXPRESSION (exp, nbytes);
else
{
unsigned int scan;
unsigned int result = 0;
/* An MRI style string. Cut into as many bytes as will fit into
a nbyte chunk, left justify if necessary, and separate with
commas so we can try again later. */
if (*input_line_pointer == 'A')
++input_line_pointer;
else if (*input_line_pointer == 'E')
{
as_bad (_("EBCDIC constants are not supported"));
++input_line_pointer;
}
input_line_pointer++;
for (scan = 0; scan < nbytes; scan++)
{
if (*input_line_pointer == '\'')
{
if (input_line_pointer[1] == '\'')
{
input_line_pointer++;
}
else
break;
}
result = (result << 8) | (*input_line_pointer++);
}
/* Left justify. */
while (scan < nbytes)
{
result <<= 8;
scan++;
}
/* Create correct expression. */
exp->X_op = O_constant;
exp->X_add_number = result;
/* Fake it so that we can read the next char too. */
if (input_line_pointer[0] != '\'' ||
(input_line_pointer[0] == '\'' && input_line_pointer[1] == '\''))
{
input_line_pointer -= 2;
input_line_pointer[0] = ',';
input_line_pointer[1] = '\'';
}
else
input_line_pointer++;
}
}
#endif /* TC_M68K */
#ifdef REPEAT_CONS_EXPRESSIONS
/* Parse a repeat expression for cons. This is used by the MIPS
assembler. The format is NUMBER:COUNT; NUMBER appears in the
object file COUNT times.
To use this for a target, define REPEAT_CONS_EXPRESSIONS. */
static void
parse_repeat_cons (exp, nbytes)
expressionS *exp;
unsigned int nbytes;
{
expressionS count;
register int i;
expression (exp);
if (*input_line_pointer != ':')
{
/* No repeat count. */
return;
}
++input_line_pointer;
expression (&count);
if (count.X_op != O_constant
|| count.X_add_number <= 0)
{
as_warn (_("unresolvable or nonpositive repeat count; using 1"));
return;
}
/* The cons function is going to output this expression once. So we
output it count - 1 times. */
for (i = count.X_add_number - 1; i > 0; i--)
emit_expr (exp, nbytes);
}
#endif /* REPEAT_CONS_EXPRESSIONS */
/* Parse a floating point number represented as a hex constant. This
permits users to specify the exact bits they want in the floating
point number. */
static int
hex_float (int float_type, char *bytes)
{
int length;
int i;
switch (float_type)
{
case 'f':
case 'F':
case 's':
case 'S':
length = 4;
break;
case 'd':
case 'D':
case 'r':
case 'R':
length = 8;
break;
case 'x':
case 'X':
length = 12;
break;
case 'p':
case 'P':
length = 12;
break;
default:
as_bad (_("unknown floating type type '%c'"), float_type);
return -1;
}
/* It would be nice if we could go through expression to parse the
hex constant, but if we get a bignum it's a pain to sort it into
the buffer correctly. */
i = 0;
while (hex_p (*input_line_pointer) || *input_line_pointer == '_')
{
int d;
/* The MRI assembler accepts arbitrary underscores strewn about
through the hex constant, so we ignore them as well. */
if (*input_line_pointer == '_')
{
++input_line_pointer;
continue;
}
if (i >= length)
{
as_warn (_("floating point constant too large"));
return -1;
}
d = hex_value (*input_line_pointer) << 4;
++input_line_pointer;
while (*input_line_pointer == '_')
++input_line_pointer;
if (hex_p (*input_line_pointer))
{
d += hex_value (*input_line_pointer);
++input_line_pointer;
}
if (target_big_endian)
bytes[i] = d;
else
bytes[length - i - 1] = d;
++i;
}
if (i < length)
{
if (target_big_endian)
memset (bytes + i, 0, length - i);
else
memset (bytes, 0, length - i);
}
return length;
}
/* float_cons()
CONStruct some more frag chars of .floats .ffloats etc.
Makes 0 or more new frags.
If need_pass_2 == 1, no frags are emitted.
This understands only floating literals, not expressions. Sorry.
A floating constant is defined by atof_generic(), except it is preceded
by 0d 0f 0g or 0h. After observing the STRANGE way my BSD AS does its
reading, I decided to be incompatible. This always tries to give you
rounded bits to the precision of the pseudo-op. Former AS did premature
truncation, restored noisy bits instead of trailing 0s AND gave you
a choice of 2 flavours of noise according to which of 2 floating-point
scanners you directed AS to use.
In: input_line_pointer->whitespace before, or '0' of flonum. */
void
float_cons (/* Clobbers input_line-pointer, checks end-of-line. */
register int float_type /* 'f':.ffloat ... 'F':.float ... */)
{
register char *p;
int length; /* Number of chars in an object. */
register char *err; /* Error from scanning floating literal. */
char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
if (is_it_end_of_statement ())
{
demand_empty_rest_of_line ();
return;
}
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
do
{
/* input_line_pointer->1st char of a flonum (we hope!). */
SKIP_WHITESPACE ();
/* Skip any 0{letter} that may be present. Don't even check if the
letter is legal. Someone may invent a "z" format and this routine
has no use for such information. Lusers beware: you get
diagnostics if your input is ill-conditioned. */
if (input_line_pointer[0] == '0'
&& ISALPHA (input_line_pointer[1]))
input_line_pointer += 2;
/* Accept :xxxx, where the x's are hex digits, for a floating
point with the exact digits specified. */
if (input_line_pointer[0] == ':')
{
++input_line_pointer;
length = hex_float (float_type, temp);
if (length < 0)
{
ignore_rest_of_line ();
return;
}
}
else
{
err = md_atof (float_type, temp, &length);
know (length <= MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT);
know (length > 0);
if (err)
{
as_bad (_("bad floating literal: %s"), err);
ignore_rest_of_line ();
return;
}
}
if (!need_pass_2)
{
int count;
count = 1;
#ifdef REPEAT_CONS_EXPRESSIONS
if (*input_line_pointer == ':')
{
expressionS count_exp;
++input_line_pointer;
expression (&count_exp);
if (count_exp.X_op != O_constant
|| count_exp.X_add_number <= 0)
as_warn (_("unresolvable or nonpositive repeat count; using 1"));
else
count = count_exp.X_add_number;
}
#endif
while (--count >= 0)
{
p = frag_more (length);
memcpy (p, temp, (unsigned int) length);
}
}
SKIP_WHITESPACE ();
}
while (*input_line_pointer++ == ',');
/* Put terminator back into stream. */
--input_line_pointer;
demand_empty_rest_of_line ();
}
/* Return the size of a LEB128 value. */
static inline int
sizeof_sleb128 (offsetT value)
{
register int size = 0;
register unsigned byte;
do
{
byte = (value & 0x7f);
/* Sadly, we cannot rely on typical arithmetic right shift behaviour.
Fortunately, we can structure things so that the extra work reduces
to a noop on systems that do things "properly". */
value = (value >> 7) | ~(-(offsetT)1 >> 7);
size += 1;
}
while (!(((value == 0) && ((byte & 0x40) == 0))
|| ((value == -1) && ((byte & 0x40) != 0))));
return size;
}
static inline int
sizeof_uleb128 (valueT value)
{
register int size = 0;
register unsigned byte;
do
{
byte = (value & 0x7f);
value >>= 7;
size += 1;
}
while (value != 0);
return size;
}
int
sizeof_leb128 (valueT value, int sign)
{
if (sign)
return sizeof_sleb128 ((offsetT) value);
else
return sizeof_uleb128 (value);
}
/* Output a LEB128 value. */
static inline int
output_sleb128 (char *p, offsetT value)
{
register char *orig = p;
register int more;
do
{
unsigned byte = (value & 0x7f);
/* Sadly, we cannot rely on typical arithmetic right shift behaviour.
Fortunately, we can structure things so that the extra work reduces
to a noop on systems that do things "properly". */
value = (value >> 7) | ~(-(offsetT)1 >> 7);
more = !((((value == 0) && ((byte & 0x40) == 0))
|| ((value == -1) && ((byte & 0x40) != 0))));
if (more)
byte |= 0x80;
*p++ = byte;
}
while (more);
return p - orig;
}
static inline int
output_uleb128 (char *p, valueT value)
{
char *orig = p;
do
{
unsigned byte = (value & 0x7f);
value >>= 7;
if (value != 0)
/* More bytes to follow. */
byte |= 0x80;
*p++ = byte;
}
while (value != 0);
return p - orig;
}
int
output_leb128 (char *p, valueT value, int sign)
{
if (sign)
return output_sleb128 (p, (offsetT) value);
else
return output_uleb128 (p, value);
}
/* Do the same for bignums. We combine sizeof with output here in that
we don't output for NULL values of P. It isn't really as critical as
for "normal" values that this be streamlined. */
static inline int
output_big_sleb128 (char *p, LITTLENUM_TYPE *bignum, int size)
{
char *orig = p;
valueT val = 0;
int loaded = 0;
unsigned byte;
/* Strip leading sign extensions off the bignum. */
while (size > 1
&& bignum[size - 1] == LITTLENUM_MASK
&& bignum[size - 2] > LITTLENUM_MASK / 2)
size--;
do
{
/* OR in the next part of the littlenum. */
val |= (*bignum << loaded);
loaded += LITTLENUM_NUMBER_OF_BITS;
size--;
bignum++;
/* Add bytes until there are less than 7 bits left in VAL
or until every non-sign bit has been written. */
do
{
byte = val & 0x7f;
loaded -= 7;
val >>= 7;
if (size > 0
|| val != ((byte & 0x40) == 0 ? 0 : ((valueT) 1 << loaded) - 1))
byte |= 0x80;
if (orig)
*p = byte;
p++;
}
while ((byte & 0x80) != 0 && loaded >= 7);
}
while (size > 0);
/* Mop up any left-over bits (of which there will be less than 7). */
if ((byte & 0x80) != 0)
{
/* Sign-extend VAL. */
if (val & (1 << (loaded - 1)))
val |= ~0 << loaded;
if (orig)
*p = val & 0x7f;
p++;
}
return p - orig;
}
static inline int
output_big_uleb128 (char *p, LITTLENUM_TYPE *bignum, int size)
{
char *orig = p;
valueT val = 0;
int loaded = 0;
unsigned byte;
/* Strip leading zeros off the bignum. */
/* XXX: Is this needed? */
while (size > 0 && bignum[size - 1] == 0)
size--;
do
{
if (loaded < 7 && size > 0)
{
val |= (*bignum << loaded);
loaded += 8 * CHARS_PER_LITTLENUM;
size--;
bignum++;
}
byte = val & 0x7f;
loaded -= 7;
val >>= 7;
if (size > 0 || val)
byte |= 0x80;
if (orig)
*p = byte;
p++;
}
while (byte & 0x80);
return p - orig;
}
static int
output_big_leb128 (char *p, LITTLENUM_TYPE *bignum, int size, int sign)
{
if (sign)
return output_big_sleb128 (p, bignum, size);
else
return output_big_uleb128 (p, bignum, size);
}
/* Generate the appropriate fragments for a given expression to emit a
leb128 value. */
static void
emit_leb128_expr (expressionS *exp, int sign)
{
operatorT op = exp->X_op;
unsigned int nbytes;
if (op == O_absent || op == O_illegal)
{
as_warn (_("zero assumed for missing expression"));
exp->X_add_number = 0;
op = O_constant;
}
else if (op == O_big && exp->X_add_number <= 0)
{
as_bad (_("floating point number invalid"));
exp->X_add_number = 0;
op = O_constant;
}
else if (op == O_register)
{
as_warn (_("register value used as expression"));
op = O_constant;
}
else if (op == O_constant
&& sign
&& (exp->X_add_number < 0) != !exp->X_unsigned)
{
/* We're outputting a signed leb128 and the sign of X_add_number
doesn't reflect the sign of the original value. Convert EXP
to a correctly-extended bignum instead. */
convert_to_bignum (exp);
op = O_big;
}
/* Let check_eh_frame know that data is being emitted. nbytes == -1 is
a signal that this is leb128 data. It shouldn't optimize this away. */
nbytes = (unsigned int) -1;
if (check_eh_frame (exp, &nbytes))
abort ();
/* Let the backend know that subsequent data may be byte aligned. */
#ifdef md_cons_align
md_cons_align (1);
#endif
if (op == O_constant)
{
/* If we've got a constant, emit the thing directly right now. */
valueT value = exp->X_add_number;
int size;
char *p;
size = sizeof_leb128 (value, sign);
p = frag_more (size);
output_leb128 (p, value, sign);
}
else if (op == O_big)
{
/* O_big is a different sort of constant. */
int size;
char *p;
size = output_big_leb128 (NULL, generic_bignum, exp->X_add_number, sign);
p = frag_more (size);
output_big_leb128 (p, generic_bignum, exp->X_add_number, sign);
}
else
{
/* Otherwise, we have to create a variable sized fragment and
resolve things later. */
frag_var (rs_leb128, sizeof_uleb128 (~(valueT) 0), 0, sign,
make_expr_symbol (exp), 0, (char *) NULL);
}
}
/* Parse the .sleb128 and .uleb128 pseudos. */
void
s_leb128 (int sign)
{
expressionS exp;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
do
{
expression (&exp);
emit_leb128_expr (&exp, sign);
}
while (*input_line_pointer++ == ',');
input_line_pointer--;
demand_empty_rest_of_line ();
}
/* We read 0 or more ',' separated, double-quoted strings.
Caller should have checked need_pass_2 is FALSE because we don't
check it. */
void
stringer (/* Worker to do .ascii etc statements. */
/* Checks end-of-line. */
register int append_zero /* 0: don't append '\0', else 1. */)
{
register unsigned int c;
char *start;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
/* The following awkward logic is to parse ZERO or more strings,
comma separated. Recall a string expression includes spaces
before the opening '\"' and spaces after the closing '\"'.
We fake a leading ',' if there is (supposed to be)
a 1st, expression. We keep demanding expressions for each ','. */
if (is_it_end_of_statement ())
{
c = 0; /* Skip loop. */
++input_line_pointer; /* Compensate for end of loop. */
}
else
{
c = ','; /* Do loop. */
}
/* If we have been switched into the abs_section then we
will not have an obstack onto which we can hang strings. */
if (now_seg == absolute_section)
{
as_bad (_("strings must be placed into a section"));
c = 0;
ignore_rest_of_line ();
}
while (c == ',' || c == '<' || c == '"')
{
SKIP_WHITESPACE ();
switch (*input_line_pointer)
{
case '\"':
++input_line_pointer; /*->1st char of string. */
start = input_line_pointer;
while (is_a_char (c = next_char_of_string ()))
{
FRAG_APPEND_1_CHAR (c);
}
if (append_zero)
{
FRAG_APPEND_1_CHAR (0);
}
know (input_line_pointer[-1] == '\"');
#ifndef NO_LISTING
#ifdef OBJ_ELF
/* In ELF, when gcc is emitting DWARF 1 debugging output, it
will emit .string with a filename in the .debug section
after a sequence of constants. See the comment in
emit_expr for the sequence. emit_expr will set
dwarf_file_string to non-zero if this string might be a
source file name. */
if (strcmp (segment_name (now_seg), ".debug") != 0)
dwarf_file_string = 0;
else if (dwarf_file_string)
{
c = input_line_pointer[-1];
input_line_pointer[-1] = '\0';
listing_source_file (start);
input_line_pointer[-1] = c;
}
#endif
#endif
break;
case '<':
input_line_pointer++;
c = get_single_number ();
FRAG_APPEND_1_CHAR (c);
if (*input_line_pointer != '>')
{
as_bad (_("expected <nn>"));
}
input_line_pointer++;
break;
case ',':
input_line_pointer++;
break;
}
SKIP_WHITESPACE ();
c = *input_line_pointer;
}
demand_empty_rest_of_line ();
} /* stringer() */
/* FIXME-SOMEDAY: I had trouble here on characters with the
high bits set. We'll probably also have trouble with
multibyte chars, wide chars, etc. Also be careful about
returning values bigger than 1 byte. xoxorich. */
unsigned int
next_char_of_string (void)
{
register unsigned int c;
c = *input_line_pointer++ & CHAR_MASK;
switch (c)
{
case '\"':
c = NOT_A_CHAR;
break;
case '\n':
as_warn (_("unterminated string; newline inserted"));
bump_line_counters ();
break;
#ifndef NO_STRING_ESCAPES
case '\\':
switch (c = *input_line_pointer++)
{
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'v':
c = '\013';
break;
case '\\':
case '"':
break; /* As itself. */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
long number;
int i;
for (i = 0, number = 0;
ISDIGIT (c) && i < 3;
c = *input_line_pointer++, i++)
{
number = number * 8 + c - '0';
}
c = number & 0xff;
}
--input_line_pointer;
break;
case 'x':
case 'X':
{
long number;
number = 0;
c = *input_line_pointer++;
while (ISXDIGIT (c))
{
if (ISDIGIT (c))
number = number * 16 + c - '0';
else if (ISUPPER (c))
number = number * 16 + c - 'A' + 10;
else
number = number * 16 + c - 'a' + 10;
c = *input_line_pointer++;
}
c = number & 0xff;
--input_line_pointer;
}
break;
case '\n':
/* To be compatible with BSD 4.2 as: give the luser a linefeed!! */
as_warn (_("unterminated string; newline inserted"));
c = '\n';
bump_line_counters ();
break;
default:
#ifdef ONLY_STANDARD_ESCAPES
as_bad (_("bad escaped character in string"));
c = '?';
#endif /* ONLY_STANDARD_ESCAPES */
break;
}
break;
#endif /* ! defined (NO_STRING_ESCAPES) */
default:
break;
}
return (c);
}
static segT
get_segmented_expression (register expressionS *expP)
{
register segT retval;
retval = expression (expP);
if (expP->X_op == O_illegal
|| expP->X_op == O_absent
|| expP->X_op == O_big)
{
as_bad (_("expected address expression"));
expP->X_op = O_constant;
expP->X_add_number = 0;
retval = absolute_section;
}
return retval;
}
static segT
get_known_segmented_expression (register expressionS *expP)
{
register segT retval;
if ((retval = get_segmented_expression (expP)) == undefined_section)
{
/* There is no easy way to extract the undefined symbol from the
expression. */
if (expP->X_add_symbol != NULL
&& S_GET_SEGMENT (expP->X_add_symbol) != expr_section)
as_warn (_("symbol \"%s\" undefined; zero assumed"),
S_GET_NAME (expP->X_add_symbol));
else
as_warn (_("some symbol undefined; zero assumed"));
retval = absolute_section;
expP->X_op = O_constant;
expP->X_add_number = 0;
}
know (retval == absolute_section || SEG_NORMAL (retval));
return (retval);
}
char /* Return terminator. */
get_absolute_expression_and_terminator (long *val_pointer /* Return value of expression. */)
{
/* FIXME: val_pointer should probably be offsetT *. */
*val_pointer = (long) get_absolute_expression ();
return (*input_line_pointer++);
}
/* Like demand_copy_string, but return NULL if the string contains any '\0's.
Give a warning if that happens. */
char *
demand_copy_C_string (int *len_pointer)
{
register char *s;
if ((s = demand_copy_string (len_pointer)) != 0)
{
register int len;
for (len = *len_pointer; len > 0; len--)
{
if (*s == 0)
{
s = 0;
len = 1;
*len_pointer = 0;
as_bad (_("this string may not contain \'\\0\'"));
}
}
}
return s;
}
/* Demand string, but return a safe (=private) copy of the string.
Return NULL if we can't read a string here. */
char *
demand_copy_string (int *lenP)
{
register unsigned int c;
register int len;
char *retval;
len = 0;
SKIP_WHITESPACE ();
if (*input_line_pointer == '\"')
{
input_line_pointer++; /* Skip opening quote. */
while (is_a_char (c = next_char_of_string ()))
{
obstack_1grow (&notes, c);
len++;
}
/* JF this next line is so demand_copy_C_string will return a
null terminated string. */
obstack_1grow (&notes, '\0');
retval = obstack_finish (&notes);
}
else
{
as_bad (_("missing string"));
retval = NULL;
ignore_rest_of_line ();
}
*lenP = len;
return (retval);
}
/* In: Input_line_pointer->next character.
Do: Skip input_line_pointer over all whitespace.
Out: 1 if input_line_pointer->end-of-line. */
int
is_it_end_of_statement (void)
{
SKIP_WHITESPACE ();
return (is_end_of_line[(unsigned char) *input_line_pointer]);
}
void
equals (char *sym_name, int reassign)
{
char *stop = NULL;
char stopc;
input_line_pointer++;
if (*input_line_pointer == '=')
input_line_pointer++;
if (reassign < 0 && *input_line_pointer == '=')
input_line_pointer++;
while (*input_line_pointer == ' ' || *input_line_pointer == '\t')
input_line_pointer++;
if (flag_mri)
stop = mri_comment_field (&stopc);
assign_symbol (sym_name, reassign >= 0 ? !reassign : reassign);
if (flag_mri)
{
demand_empty_rest_of_line ();
mri_comment_end (stop, stopc);
}
}
/* .incbin -- include a file verbatim at the current location. */
void
s_incbin (int x ATTRIBUTE_UNUSED)
{
FILE * binfile;
char * path;
char * filename;
char * binfrag;
long skip = 0;
long count = 0;
long bytes;
int len;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
SKIP_WHITESPACE ();
filename = demand_copy_string (& len);
if (filename == NULL)
return;
SKIP_WHITESPACE ();
/* Look for optional skip and count. */
if (* input_line_pointer == ',')
{
++ input_line_pointer;
skip = get_absolute_expression ();
SKIP_WHITESPACE ();
if (* input_line_pointer == ',')
{
++ input_line_pointer;
count = get_absolute_expression ();
if (count == 0)
as_warn (_(".incbin count zero, ignoring `%s'"), filename);
SKIP_WHITESPACE ();
}
}
demand_empty_rest_of_line ();
/* Try opening absolute path first, then try include dirs. */
binfile = fopen (filename, FOPEN_RB);
if (binfile == NULL)
{
int i;
path = xmalloc ((unsigned long) len + include_dir_maxlen + 5);
for (i = 0; i < include_dir_count; i++)
{
sprintf (path, "%s/%s", include_dirs[i], filename);
binfile = fopen (path, FOPEN_RB);
if (binfile != NULL)
break;
}
if (binfile == NULL)
as_bad (_("file not found: %s"), filename);
}
else
path = xstrdup (filename);
if (binfile)
{
long file_len;
register_dependency (path);
/* Compute the length of the file. */
if (fseek (binfile, 0, SEEK_END) != 0)
{
as_bad (_("seek to end of .incbin file failed `%s'"), path);
goto done;
}
file_len = ftell (binfile);
/* If a count was not specified use the remainder of the file. */
if (count == 0)
count = file_len - skip;
if (skip < 0 || count < 0 || file_len < 0 || skip + count > file_len)
{
as_bad (_("skip (%ld) or count (%ld) invalid for file size (%ld)"),
skip, count, file_len);
goto done;
}
if (fseek (binfile, skip, SEEK_SET) != 0)
{
as_bad (_("could not skip to %ld in file `%s'"), skip, path);
goto done;
}
/* Allocate frag space and store file contents in it. */
binfrag = frag_more (count);
bytes = fread (binfrag, 1, count, binfile);
if (bytes < count)
as_warn (_("truncated file `%s', %ld of %ld bytes read"),
path, bytes, count);
}
done:
if (binfile != NULL)
fclose (binfile);
if (path)
free (path);
}
/* .include -- include a file at this point. */
void
s_include (int arg ATTRIBUTE_UNUSED)
{
char *filename;
int i;
FILE *try;
char *path;
if (!flag_m68k_mri)
{
filename = demand_copy_string (&i);
if (filename == NULL)
{
/* demand_copy_string has already printed an error and
called ignore_rest_of_line. */
return;
}
}
else
{
SKIP_WHITESPACE ();
i = 0;
while (!is_end_of_line[(unsigned char) *input_line_pointer]
&& *input_line_pointer != ' '
&& *input_line_pointer != '\t')
{
obstack_1grow (&notes, *input_line_pointer);
++input_line_pointer;
++i;
}
obstack_1grow (&notes, '\0');
filename = obstack_finish (&notes);
while (!is_end_of_line[(unsigned char) *input_line_pointer])
++input_line_pointer;
}
demand_empty_rest_of_line ();
path = xmalloc ((unsigned long) i + include_dir_maxlen + 5 /* slop */ );
for (i = 0; i < include_dir_count; i++)
{
strcpy (path, include_dirs[i]);
strcat (path, "/");
strcat (path, filename);
if (0 != (try = fopen (path, FOPEN_RT)))
{
fclose (try);
goto gotit;
}
}
free (path);
path = filename;
gotit:
/* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
register_dependency (path);
input_scrub_insert_file (path);
}
void
add_include_dir (char *path)
{
int i;
if (include_dir_count == 0)
{
include_dirs = (char **) xmalloc (2 * sizeof (*include_dirs));
include_dirs[0] = "."; /* Current dir. */
include_dir_count = 2;
}
else
{
include_dir_count++;
include_dirs =
(char **) realloc (include_dirs,
include_dir_count * sizeof (*include_dirs));
}
include_dirs[include_dir_count - 1] = path; /* New one. */
i = strlen (path);
if (i > include_dir_maxlen)
include_dir_maxlen = i;
}
/* Output debugging information to denote the source file. */
static void
generate_file_debug (void)
{
if (debug_type == DEBUG_STABS)
stabs_generate_asm_file ();
}
/* Output line number debugging information for the current source line. */
void
generate_lineno_debug (void)
{
switch (debug_type)
{
case DEBUG_UNSPECIFIED:
case DEBUG_NONE:
case DEBUG_DWARF:
break;
case DEBUG_STABS:
stabs_generate_asm_lineno ();
break;
case DEBUG_ECOFF:
ecoff_generate_asm_lineno ();
break;
case DEBUG_DWARF2:
/* ??? We could here indicate to dwarf2dbg.c that something
has changed. However, since there is additional backend
support that is required (calling dwarf2_emit_insn), we
let dwarf2dbg.c call as_where on its own. */
break;
}
}
/* Output debugging information to mark a function entry point or end point.
END_P is zero for .func, and non-zero for .endfunc. */
void
s_func (int end_p)
{
do_s_func (end_p, NULL);
}
/* Subroutine of s_func so targets can choose a different default prefix.
If DEFAULT_PREFIX is NULL, use the target's "leading char". */
static void
do_s_func (int end_p, const char *default_prefix)
{
/* Record the current function so that we can issue an error message for
misplaced .func,.endfunc, and also so that .endfunc needs no
arguments. */
static char *current_name;
static char *current_label;
if (end_p)
{
if (current_name == NULL)
{
as_bad (_("missing .func"));
ignore_rest_of_line ();
return;
}
if (debug_type == DEBUG_STABS)
stabs_generate_asm_endfunc (current_name, current_label);
current_name = current_label = NULL;
}
else /* ! end_p */
{
char *name, *label;
char delim1, delim2;
if (current_name != NULL)
{
as_bad (_(".endfunc missing for previous .func"));
ignore_rest_of_line ();
return;
}
name = input_line_pointer;
delim1 = get_symbol_end ();
name = xstrdup (name);
*input_line_pointer = delim1;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
if (default_prefix)
asprintf (&label, "%s%s", default_prefix, name);
else
{
char leading_char = bfd_get_symbol_leading_char (stdoutput);
/* Missing entry point, use function's name with the leading
char prepended. */
if (leading_char)
asprintf (&label, "%c%s", leading_char, name);
else
label = name;
}
}
else
{
++input_line_pointer;
SKIP_WHITESPACE ();
label = input_line_pointer;
delim2 = get_symbol_end ();
label = xstrdup (label);
*input_line_pointer = delim2;
}
if (debug_type == DEBUG_STABS)
stabs_generate_asm_func (name, label);
current_name = name;
current_label = label;
}
demand_empty_rest_of_line ();
}
void
s_ignore (int arg ATTRIBUTE_UNUSED)
{
ignore_rest_of_line ();
}
void
read_print_statistics (FILE *file)
{
hash_print_statistics (file, "pseudo-op table", po_hash);
}
/* Inserts the given line into the input stream.
This call avoids macro/conditionals nesting checking, since the contents of
the line are assumed to replace the contents of a line already scanned.
An appropriate use of this function would be substitution of input lines when
called by md_start_line_hook(). The given line is assumed to already be
properly scrubbed. */
void
input_scrub_insert_line (const char *line)
{
sb newline;
sb_new (&newline);
sb_add_string (&newline, line);
input_scrub_include_sb (&newline, input_line_pointer, 0);
sb_kill (&newline);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Insert a file into the input stream; the path must resolve to an actual
file; no include path searching or dependency registering is performed. */
void
input_scrub_insert_file (char *path)
{
input_scrub_include_file (path, input_line_pointer);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Find the end of a line, considering quotation and escaping of quotes. */
#if !defined(TC_SINGLE_QUOTE_STRINGS) && defined(SINGLE_QUOTE_STRINGS)
# define TC_SINGLE_QUOTE_STRINGS 1
#endif
static char *
_find_end_of_line (char *s, int mri_string, int insn ATTRIBUTE_UNUSED)
{
char inquote = '\0';
int inescape = 0;
while (!is_end_of_line[(unsigned char) *s]
|| (inquote && !ISCNTRL (*s))
|| (inquote == '\'' && flag_mri)
#ifdef TC_EOL_IN_INSN
|| (insn && TC_EOL_IN_INSN (s))
#endif
)
{
if (mri_string && *s == '\'')
inquote ^= *s;
else if (inescape)
inescape = 0;
else if (*s == '\\')
inescape = 1;
else if (!inquote
? *s == '"'
#ifdef TC_SINGLE_QUOTE_STRINGS
|| (TC_SINGLE_QUOTE_STRINGS && *s == '\'')
#endif
: *s == inquote)
inquote ^= *s;
++s;
}
if (inquote)
as_warn (_("missing closing `%c'"), inquote);
if (inescape)
as_warn (_("stray `\\'"));
return s;
}
char *
find_end_of_line (char *s, int mri_string)
{
return _find_end_of_line (s, mri_string, 0);
}
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