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binutils-gdb/gas/read.c

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/* read.c - read a source file -
Copyright (C) 1986, 87, 90, 91, 92, 93, 94, 95, 96, 1997
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, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#if 0
#define MASK_CHAR (0xFF) /* If your chars aren't 8 bits, you will
change this a bit. But then, GNU isn't
spozed to run on your machine anyway.
(RMS is so shortsighted sometimes.)
*/
#else
#define MASK_CHAR ((int)(unsigned char)-1)
#endif
/* 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 spagetti in memory.
Another group of these functions is in the expr.c module. */
/* for isdigit() */
#include <ctype.h>
#include "as.h"
#include "subsegs.h"
#include "sb.h"
#include "macro.h"
#include "obstack.h"
#include "listing.h"
#include "ecoff.h"
#ifndef TC_START_LABEL
#define TC_START_LABEL(x,y) (x==':')
#endif
/* The NOP_OPCODE is for the alignment fill value.
* fill it a nop instruction so that the disassembler does not choke
* on it
*/
#ifndef NOP_OPCODE
#define NOP_OPCODE 0x00
#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
/* The m88k unfortunately uses @ as a label beginner. */
#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_DOLLAR
/* The a29k assembler does not permits labels to start with $. */
#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, 0, 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{|}~. */
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,
};
/*
* In: a character.
* Out: 1 if this character ends a line.
*/
#define _ (0)
char is_end_of_line[256] =
{
#ifdef CR_EOL
_, _, _, _, _, _, _, _, _, _, 99, _, _, 99, _, _, /* @abcdefghijklmno */
#else
_, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, _, /* @abcdefghijklmno */
#endif
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
#ifdef TC_HPPA
_,99, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* _!"#$%&'()*+,-./ */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* 0123456789:;<=>? */
#else
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, 99, _, _, _, _, /* 0123456789:;<=>? */
#endif
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, /* */
};
#undef _
/* 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;
static char *old_buffer; /* JF a hack */
static char *old_input;
static char *old_limit;
/* Variables for handling include file directory list. */
char **include_dirs; /* List of pointers to directories to
search for .include's */
int include_dir_count; /* How many are in the list */
int include_dir_maxlen = 1;/* Length of longest in list */
#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;
static void cons_worker PARAMS ((int, int));
static int scrub_from_string PARAMS ((char **));
static void do_align PARAMS ((int, char *, int, int));
static void s_align PARAMS ((int, int));
static int hex_float PARAMS ((int, char *));
static void do_org PARAMS ((segT, expressionS *, int));
char *demand_copy_string PARAMS ((int *lenP));
static segT get_segmented_expression PARAMS ((expressionS *expP));
static segT get_known_segmented_expression PARAMS ((expressionS * expP));
static void pobegin PARAMS ((void));
static int get_line_sb PARAMS ((sb *));
void
read_begin ()
{
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;
}
/* 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},
{"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},
{"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},
{"end", s_end, 0},
{"endc", s_endif, 0},
{"endif", s_endif, 0},
/* endef */
{"equ", s_set, 0},
{"equiv", s_set, 1},
{"err", s_err, 0},
{"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},
{"global", s_globl, 0},
{"globl", s_globl, 0},
{"hword", cons, 2},
{"if", s_if, (int) O_ne},
{"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},
{"ifnc", s_ifc, 1},
{"ifndef", s_ifdef, 1},
{"ifne", s_if, (int) O_ne},
{"ifnes", s_ifeqs, 1},
{"ifnotdef", s_ifdef, 1},
{"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},
{"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'},
{"word", cons, 2},
{"zero", s_space, 0},
{NULL} /* end sentinel */
};
static int pop_override_ok = 0;
static const char *pop_table_name;
void
pop_insert (table)
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
static void
pobegin ()
{
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);
}
#define HANDLE_CONDITIONAL_ASSEMBLY() \
if (ignore_input ()) \
{ \
while (! is_end_of_line[(unsigned char) *input_line_pointer++]) \
if (input_line_pointer == buffer_limit) \
break; \
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 (from)
char **from;
{
int size;
*from = scrub_string;
size = scrub_string_end - scrub_string;
scrub_string = scrub_string_end;
return size;
}
/* read_a_source_file()
*
* We read the file, putting things into a web that
* represents what we have been reading.
*/
void
read_a_source_file (name)
char *name;
{
register char c;
register char *s; /* string of symbol, '\0' appended */
register int temp;
pseudo_typeS *pop;
buffer = input_scrub_new_file (name);
listing_file (name);
listing_newline ("");
register_dependency (name);
while ((buffer_limit = input_scrub_next_buffer (&input_line_pointer)) != 0)
{ /* We have another line to parse. */
know (buffer_limit[-1] == '\n'); /* Must have a sentinel. */
contin: /* JF this goto is my fault I admit it.
Someone brave please re-write the whole
input section here? Pleeze??? */
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 (flag_m68k_mri
#ifdef LABELS_WITHOUT_COLONS
|| 1
#endif
)
{
/* 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)
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 begining 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. */
LISTING_NEWLINE ();
/*
* 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 */
*input_line_pointer++ = ':'; /* Put ':' back for error messages' sake. */
/* Input_line_pointer->after ':'. */
SKIP_WHITESPACE ();
}
else if (c == '='
|| ((c == ' ' || c == '\t')
&& input_line_pointer[1] == '='
#ifdef TC_EQUAL_IN_INSN
&& ! TC_EQUAL_IN_INSN (c, input_line_pointer)
#endif
))
{
equals (s, 1);
demand_empty_rest_of_line ();
}
else
{ /* expect pseudo-op or machine instruction */
pop = NULL;
#define IGNORE_OPCODE_CASE
#ifdef IGNORE_OPCODE_CASE
{
char *s2 = s;
while (*s2)
{
if (isupper (*s2))
*s2 = tolower (*s2);
s2++;
}
}
#endif
if (flag_m68k_mri
#ifdef NO_PSEUDO_DOT
|| 1
#endif
)
{
/* The MRI assembler and the m88k use 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);
/* 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)
{
line_label->sy_frag = frag_now;
S_SET_VALUE (line_label, frag_now_fix ());
}
}
/* Print the error msg now, while we still can */
if (pop == NULL)
{
as_bad ("Unknown pseudo-op: `%s'", s);
*input_line_pointer = c;
s_ignore (0);
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
{
int inquote = 0;
/* WARNING: c has char, which may be end-of-line. */
/* Also: input_line_pointer->`\0` where c was. */
*input_line_pointer = c;
while (!is_end_of_line[(unsigned char) *input_line_pointer]
|| inquote
#ifdef TC_EOL_IN_INSN
|| TC_EOL_IN_INSN (input_line_pointer)
#endif
)
{
if (flag_m68k_mri && *input_line_pointer == '\'')
inquote = ! inquote;
input_line_pointer++;
}
c = *input_line_pointer;
*input_line_pointer = '\0';
if (debug_type == DEBUG_STABS)
stabs_generate_asm_lineno ();
#ifdef OBJ_GENERATE_ASM_LINENO
#ifdef ECOFF_DEBUGGING
/* ECOFF assemblers automatically generate
debugging information. FIXME: This should
probably be handled elsewhere. */
if (debug_type == DEBUG_NONE)
{
if (ecoff_no_current_file ())
debug_type = DEBUG_ECOFF;
}
if (debug_type == DEBUG_ECOFF)
{
unsigned int lineno;
char *s;
as_where (&s, &lineno);
OBJ_GENERATE_ASM_LINENO (s, lineno);
}
#endif
#endif
if (macro_defined)
{
sb out;
const char *err;
if (check_macro (s, &out, '\0', &err))
{
if (err != NULL)
as_bad (err);
*input_line_pointer++ = c;
input_scrub_include_sb (&out,
input_line_pointer);
sb_kill (&out);
buffer_limit =
input_scrub_next_buffer (&input_line_pointer);
continue;
}
}
if (mri_pending_align)
{
do_align (1, (char *) NULL, 0, 0);
mri_pending_align = 0;
if (line_label != NULL)
{
line_label->sy_frag = 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. */
} /* if (*s=='.') */
} /* if c==':' */
continue;
} /* if (is_name_beginner(c) */
/* 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';
while (isdigit (*input_line_pointer))
{
temp = (temp * 10) + *input_line_pointer - '0';
++input_line_pointer;
} /* read the whole number */
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 */
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;
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
guarentee 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;
break;
}
new_buf = xrealloc (new_buf, new_length + 100);
new_tmp = new_buf + new_length;
new_length += 100;
}
if (tmp_buf)
free (tmp_buf);
old_buffer = buffer;
old_input = input_line_pointer;
old_limit = buffer_limit;
buffer = new_buf;
input_line_pointer = new_buf;
buffer_limit = new_tmp;
continue;
}
HANDLE_CONDITIONAL_ASSEMBLY ();
#ifdef tc_unrecognized_line
if (tc_unrecognized_line (c))
continue;
#endif
/* as_warn("Junk character %d.",c); Now done by ignore_rest */
input_line_pointer--; /* Report unknown char as ignored. */
ignore_rest_of_line ();
} /* while (input_line_pointer<buffer_limit) */
#ifdef md_after_pass_hook
md_after_pass_hook ();
#endif
if (old_buffer)
{
free (buffer);
bump_line_counters ();
if (old_input != 0)
{
buffer = old_buffer;
input_line_pointer = old_input;
buffer_limit = old_limit;
old_buffer = 0;
goto contin;
}
}
} /* while (more buffers to scan) */
quit:
#ifdef md_cleanup
md_cleanup();
#endif
input_scrub_close (); /* Close the input file */
}
/* 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 (stopcp)
char *stopcp;
{
#ifdef TC_M68K
char *s;
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;
}
*stopcp = *s;
*s = '\0';
return s;
#else
char *s;
for (s = input_line_pointer; ! is_end_of_line[(unsigned char) *s]; s++)
;
*stopcp = *s;
*s = '\0';
return s;
#endif
}
/* Skip to the end of an MRI comment field. */
void
mri_comment_end (stop, stopc)
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 (ignore)
int ignore;
{
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 (n, fill, len, max)
int n;
char *fill;
int len;
int max;
{
char default_fill;
#ifdef md_do_align
md_do_align (n, fill, len, max, just_record_alignment);
#endif
if (fill == NULL)
{
int maybe_text;
#ifdef BFD_ASSEMBLER
if ((bfd_get_section_flags (stdoutput, now_seg) & SEC_CODE) != 0)
maybe_text = 1;
else
maybe_text = 0;
#else
if (now_seg != data_section && now_seg != bss_section)
maybe_text = 1;
else
maybe_text = 0;
#endif
if (maybe_text)
default_fill = NOP_OPCODE;
else
default_fill = 0;
fill = &default_fill;
len = 1;
}
/* Only make a frag if we HAVE to. . . */
if (n != 0 && !need_pass_2)
{
if (len <= 1)
frag_align (n, *fill, max);
else
frag_align_pattern (n, fill, len, max);
}
#ifdef md_do_align
just_record_alignment:
#endif
record_alignment (now_seg, n);
}
/* 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. */
static void
s_align (arg, bytes_p)
int arg;
int bytes_p;
{
register 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 > 15)
{
align = 15;
as_bad ("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 (fill_len > sizeof ab)
abort ();
md_number_to_chars (ab, fill, fill_len);
do_align (align, ab, fill_len, max);
}
}
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
/* Handle the .align pseudo-op on machines where ".align 4" means
align to a 4 byte boundary. */
void
s_align_bytes (arg)
int arg;
{
s_align (arg, 1);
}
/* Handle the .align pseud-op on machines where ".align 4" means align
to a 2**4 boundary. */
void
s_align_ptwo (arg)
int arg;
{
s_align (arg, 0);
}
void
s_comm (ignore)
int ignore;
{
register char *name;
register char c;
register char *p;
offsetT temp;
register symbolS *symbolP;
char *stop = NULL;
char stopc;
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;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
as_bad ("Expected comma after symbol-name: rest of line ignored.");
if (flag_mri)
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
return;
}
input_line_pointer++; /* skip ',' */
if ((temp = get_absolute_expression ()) < 0)
{
as_warn (".COMMon length (%ld.) <0! Ignored.", (long) temp);
if (flag_mri)
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
return;
}
*p = 0;
symbolP = symbol_find_or_make (name);
*p = c;
if (S_IS_DEFINED (symbolP) && ! S_IS_COMMON (symbolP))
{
as_bad ("Ignoring attempt to re-define symbol `%s'.",
S_GET_NAME (symbolP));
if (flag_mri)
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
return;
}
if (S_GET_VALUE (symbolP))
{
if (S_GET_VALUE (symbolP) != (valueT) temp)
as_bad ("Length of .comm \"%s\" is already %ld. Not changed to %ld.",
S_GET_NAME (symbolP),
(long) S_GET_VALUE (symbolP),
(long) temp);
}
else
{
S_SET_VALUE (symbolP, (valueT) temp);
S_SET_EXTERNAL (symbolP);
}
#ifdef OBJ_VMS
{
extern int flag_one;
if ( (!temp) || !flag_one)
S_GET_OTHER(symbolP) = const_flag;
}
#endif /* not OBJ_VMS */
know (symbolP->sy_frag == &zero_address_frag);
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
} /* s_comm() */
/* 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 (small)
int small;
{
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 ((unsigned char) *name))
c = get_symbol_end ();
else
{
do
{
++input_line_pointer;
}
while (isdigit ((unsigned char) *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 ("attempt to re-define symbol `%s'", S_GET_NAME (sym));
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
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)
{
line_label->sy_value.X_op = O_symbol;
line_label->sy_value.X_add_symbol = sym;
line_label->sy_value.X_add_number = S_GET_VALUE (sym);
line_label->sy_frag = &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;
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
void
s_data (ignore)
int ignore;
{
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 (appfile)
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. */
new_logical_line (s, appfile ? -2 : -1);
/* 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 ();
#ifdef LISTING
if (listing)
listing_source_file (s);
#endif
register_dependency (s);
}
#ifdef obj_app_file
obj_app_file (s);
#endif
}
/* 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 (ignore)
int ignore;
{
int l;
/* The given number is that of the next line. */
l = get_absolute_expression () - 1;
if (l < 0)
/* Some of the back ends can't deal with non-positive line numbers.
Besides, it's silly. */
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 (ignore)
int ignore;
{
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 (ignore)
int ignore;
{
as_bad (".err encountered");
demand_empty_rest_of_line ();
}
/* Handle the MRI fail pseudo-op. */
void
s_fail (ignore)
int ignore;
{
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);
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
void
s_fill (ignore)
int ignore;
{
long temp_repeat = 0;
long temp_size = 1;
register long temp_fill = 0;
char *p;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
temp_repeat = get_absolute_expression ();
if (*input_line_pointer == ',')
{
input_line_pointer++;
temp_size = get_absolute_expression ();
if (*input_line_pointer == ',')
{
input_line_pointer++;
temp_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 (temp_size > BSD_FILL_SIZE_CROCK_8)
{
as_warn (".fill size clamped to %d.", BSD_FILL_SIZE_CROCK_8);
temp_size = BSD_FILL_SIZE_CROCK_8;
}
if (temp_size < 0)
{
as_warn ("Size negative: .fill ignored.");
temp_size = 0;
}
else if (temp_repeat <= 0)
{
if (temp_repeat < 0)
as_warn ("Repeat < 0, .fill ignored");
temp_size = 0;
}
if (temp_size && !need_pass_2)
{
p = frag_var (rs_fill, (int) temp_size, (int) temp_size,
(relax_substateT) 0, (symbolS *) 0, (offsetT) temp_repeat,
(char *) 0);
memset (p, 0, (unsigned int) temp_size);
/* The magic number BSD_FILL_SIZE_CROCK_4 is from BSD 4.2 VAX
* flavoured AS. The following bizzare 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. Un*x Sux. */
#define BSD_FILL_SIZE_CROCK_4 (4)
md_number_to_chars (p, (valueT) temp_fill,
(temp_size > BSD_FILL_SIZE_CROCK_4
? BSD_FILL_SIZE_CROCK_4
: (int) temp_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 (ignore)
int ignore;
{
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);
*input_line_pointer = c;
SKIP_WHITESPACE ();
S_SET_EXTERNAL (symbolP);
if (c == ',')
{
input_line_pointer++;
SKIP_WHITESPACE ();
if (*input_line_pointer == '\n')
c = '\n';
}
}
while (c == ',');
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
/* Handle the MRI IRP and IRPC pseudo-ops. */
void
s_irp (irpc)
int irpc;
{
char *file;
unsigned int line;
sb s;
const char *err;
sb out;
as_where (&file, &line);
sb_new (&s);
while (! is_end_of_line[(unsigned char) *input_line_pointer])
sb_add_char (&s, *input_line_pointer++);
sb_new (&out);
err = expand_irp (irpc, 0, &s, &out, get_line_sb, '\0');
if (err != NULL)
as_bad_where (file, line, "%s", err);
sb_kill (&s);
input_scrub_include_sb (&out, input_line_pointer);
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 (ignore)
int ignore;
{
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) */
#ifdef BFD_ASSEMBLER
{
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 ()));
}
#else /* ! defined (BFD_ASSEMBLER) */
as_warn (".linkonce is not supported for this object file format");
#endif /* ! defined (BFD_ASSEMBLER) */
#endif /* ! defined (obj_handle_link_once) */
demand_empty_rest_of_line ();
}
void
s_lcomm (needs_align)
/* 1 if this was a ".bss" directive, which may require a 3rd argument
(alignment); 0 if it was an ".lcomm" (2 args only) */
int needs_align;
{
register char *name;
register char c;
register char *p;
register int temp;
register symbolS *symbolP;
segT current_seg = now_seg;
subsegT current_subseg = now_subseg;
const int max_alignment = 15;
int align = 0;
segT bss_seg = bss_section;
name = input_line_pointer;
c = get_symbol_end ();
p = input_line_pointer;
*p = c;
SKIP_WHITESPACE ();
/* Accept an optional comma after the name. The comma used to be
required, but Irix 5 cc does not generate it. */
if (*input_line_pointer == ',')
{
++input_line_pointer;
SKIP_WHITESPACE ();
}
if (*input_line_pointer == '\n')
{
as_bad ("Missing size expression");
return;
}
if ((temp = get_absolute_expression ()) < 0)
{
as_warn ("BSS length (%d.) <0! Ignored.", temp);
ignore_rest_of_line ();
return;
}
#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 (temp <= bfd_get_gp_size (stdoutput))
{
bss_seg = subseg_new (".sbss", 1);
seg_info (bss_seg)->bss = 1;
#ifdef BFD_ASSEMBLER
if (! bfd_set_section_flags (stdoutput, bss_seg, SEC_ALLOC))
as_warn ("error setting flags for \".sbss\": %s",
bfd_errmsg (bfd_get_error ()));
#endif
}
}
#endif
if (!needs_align)
{
/* FIXME. This needs to be machine independent. */
if (temp >= 8)
align = 3;
else if (temp >= 4)
align = 2;
else if (temp >= 2)
align = 1;
else
align = 0;
#ifdef OBJ_EVAX
/* FIXME: This needs to be done in a more general fashion. */
align = 3;
#endif
record_alignment(bss_seg, align);
}
if (needs_align)
{
align = 0;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
as_bad ("Expected comma after size");
ignore_rest_of_line ();
return;
}
input_line_pointer++;
SKIP_WHITESPACE ();
if (*input_line_pointer == '\n')
{
as_bad ("Missing alignment");
return;
}
align = get_absolute_expression ();
if (align > max_alignment)
{
align = max_alignment;
as_warn ("Alignment too large: %d. assumed.", align);
}
else if (align < 0)
{
align = 0;
as_warn ("Alignment negative. 0 assumed.");
}
record_alignment (bss_seg, align);
} /* if needs align */
else
{
/* Assume some objects may require alignment on some systems. */
#if defined (TC_ALPHA) && ! defined (VMS)
if (temp > 1)
{
align = ffs (temp) - 1;
if (temp % (1 << align))
abort ();
}
#endif
}
*p = 0;
symbolP = symbol_find_or_make (name);
*p = c;
if (
#if defined(OBJ_AOUT) | defined(OBJ_BOUT)
S_GET_OTHER (symbolP) == 0 &&
S_GET_DESC (symbolP) == 0 &&
#endif /* OBJ_AOUT or OBJ_BOUT */
(S_GET_SEGMENT (symbolP) == bss_seg
|| (!S_IS_DEFINED (symbolP) && S_GET_VALUE (symbolP) == 0)))
{
char *pfrag;
subseg_set (bss_seg, 1);
if (align)
frag_align (align, 0, 0);
/* detach from old frag */
if (S_GET_SEGMENT (symbolP) == bss_seg)
symbolP->sy_frag->fr_symbol = NULL;
symbolP->sy_frag = frag_now;
pfrag = frag_var (rs_org, 1, 1, (relax_substateT)0, symbolP,
(offsetT) temp, (char *) 0);
*pfrag = 0;
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 */
#ifdef S_SET_SIZE
S_SET_SIZE (symbolP, temp);
#endif
}
else
as_bad ("Ignoring attempt to re-define symbol `%s'.",
S_GET_NAME (symbolP));
subseg_set (current_seg, current_subseg);
demand_empty_rest_of_line ();
} /* s_lcomm() */
void
s_lsym (ignore)
int ignore;
{
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;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
*p = 0;
as_bad ("Expected comma after name \"%s\"", name);
*p = c;
ignore_rest_of_line ();
return;
}
input_line_pointer++;
expression (&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 already defined", name);
}
*p = c;
demand_empty_rest_of_line ();
} /* s_lsym() */
/* Read a line into an sb. */
static int
get_line_sb (line)
sb *line;
{
char quote1, quote2, inquote;
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;
}
/* If app.c sets any other characters to LEX_IS_STRINGQUOTE, this
code needs to be changed. */
if (! flag_m68k_mri)
quote1 = '"';
else
quote1 = '\0';
quote2 = '\0';
if (flag_m68k_mri)
quote2 = '\'';
#ifdef LEX_IS_STRINGQUOTE
quote2 = '\'';
#endif
inquote = '\0';
while (! is_end_of_line[(unsigned char) *input_line_pointer]
|| (inquote != '\0' && *input_line_pointer != '\n'))
{
if (inquote == *input_line_pointer)
inquote = '\0';
else if (inquote == '\0')
{
if (*input_line_pointer == quote1)
inquote = quote1;
else if (*input_line_pointer == quote2)
inquote = quote2;
}
sb_add_char (line, *input_line_pointer++);
}
while (input_line_pointer < buffer_limit && *input_line_pointer == '\n')
{
if (input_line_pointer[-1] == '\n')
bump_line_counters ();
++input_line_pointer;
}
return 1;
}
/* Define a macro. This is an interface to macro.c, which is shared
between gas and gasp. */
void
s_macro (ignore)
int ignore;
{
char *file;
unsigned int line;
sb s;
sb label;
const char *err;
const char *name;
as_where (&file, &line);
sb_new (&s);
while (! is_end_of_line[(unsigned char) *input_line_pointer])
sb_add_char (&s, *input_line_pointer++);
sb_new (&label);
if (line_label != NULL)
sb_add_string (&label, S_GET_NAME (line_label));
err = define_macro (0, &s, &label, get_line_sb, &name);
if (err != NULL)
as_bad_where (file, line, "%s", err);
else
{
if (line_label != NULL)
{
S_SET_SEGMENT (line_label, undefined_section);
S_SET_VALUE (line_label, 0);
line_label->sy_frag = &zero_address_frag;
}
if (((flag_m68k_mri
#ifdef NO_PSEUDO_DOT
|| 1
#endif
)
&& hash_find (po_hash, name) != NULL)
|| (! flag_m68k_mri
&& *name == '.'
&& hash_find (po_hash, name + 1) != NULL))
as_warn ("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 (ignore)
int ignore;
{
cond_exit_macro (macro_nest);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Switch in and out of MRI mode. */
void
s_mri (ignore)
int ignore;
{
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
}
else
{
flag_mri = 0;
flag_m68k_mri = 0;
}
#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 (segment, exp, fill)
segT segment;
expressionS *exp;
int fill;
{
if (segment != now_seg && segment != absolute_section)
as_bad ("invalid segment \"%s\"; segment \"%s\" assumed",
segment_name (segment), segment_name (now_seg));
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;
p = frag_var (rs_org, 1, 1, (relax_substateT) 0, exp->X_add_symbol,
exp->X_add_number, (char *) NULL);
*p = fill;
}
}
void
s_org (ignore)
int ignore;
{
register segT segment;
expressionS exp;
register long temp_fill;
/* 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 ();
} /* s_org() */
/* 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). If BFD_ASSEMBLER is defined, the
flags will be set in the section. */
void
s_mri_sect (type)
char *type;
{
#ifdef TC_M68K
char *name;
char c;
segT seg;
SKIP_WHITESPACE ();
name = input_line_pointer;
if (! isdigit ((unsigned char) *name))
c = get_symbol_end ();
else
{
do
{
++input_line_pointer;
}
while (isdigit ((unsigned char) *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 ((unsigned char) c);
if (c == 'C' || c == 'D' || c == 'M' || c == 'R')
*type = c;
else
as_bad ("unrecognized section type");
++input_line_pointer;
#ifdef BFD_ASSEMBLER
{
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 ()));
}
}
#endif
}
/* 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. */
abort ();
#endif /* ! TC_I960 */
#endif /* ! TC_M68K */
}
/* Handle the .print pseudo-op. */
void
s_print (ignore)
int ignore;
{
char *s;
int len;
s = demand_copy_C_string (&len);
printf ("%s\n", s);
demand_empty_rest_of_line ();
}
/* Handle the .purgem pseudo-op. */
void
s_purgem (ignore)
int ignore;
{
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 .rept pseudo-op. */
void
s_rept (ignore)
int ignore;
{
int count;
sb one;
sb many;
count = get_absolute_expression ();
sb_new (&one);
if (! buffer_and_nest ("REPT", "ENDR", &one, get_line_sb))
{
as_bad ("rept without endr");
return;
}
sb_new (&many);
while (count-- > 0)
sb_add_sb (&many, &one);
sb_kill (&one);
input_scrub_include_sb (&many, input_line_pointer);
sb_kill (&many);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
}
/* Handle the .equ, .equiv and .set directives. If EQUIV is 1, then
this is .equiv, and it is an error if the symbol is already
defined. */
void
s_set (equiv)
int equiv;
{
register char *name;
register char delim;
register char *end_name;
register symbolS *symbolP;
/*
* 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;
SKIP_WHITESPACE ();
if (*input_line_pointer != ',')
{
*end_name = 0;
as_bad ("Expected comma after name \"%s\"", name);
*end_name = delim;
ignore_rest_of_line ();
return;
}
input_line_pointer++;
*end_name = 0;
if (name[0] == '.' && name[1] == '\0')
{
/* Turn '. = mumble' into a .org mumble */
register segT segment;
expressionS exp;
segment = get_known_segmented_expression (&exp);
if (!need_pass_2)
do_org (segment, &exp, 0);
*end_name = delim;
return;
}
if ((symbolP = symbol_find (name)) == NULL
&& (symbolP = md_undefined_symbol (name)) == NULL)
{
symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
#ifdef OBJ_COFF
/* "set" symbols are local unless otherwise specified. */
SF_SET_LOCAL (symbolP);
#endif /* OBJ_COFF */
} /* make a new symbol */
symbol_table_insert (symbolP);
*end_name = delim;
if (equiv
&& S_IS_DEFINED (symbolP)
&& S_GET_SEGMENT (symbolP) != reg_section)
as_bad ("symbol `%s' already defined", S_GET_NAME (symbolP));
pseudo_set (symbolP);
demand_empty_rest_of_line ();
} /* s_set() */
void
s_space (mult)
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)
{
know (line_label->sy_value.X_op == O_symbol);
know (line_label->sy_value.X_add_symbol == mri_common_symbol);
line_label->sy_value.X_add_number += 1;
}
}
}
else
{
do_align (1, (char *) NULL, 0, 0);
if (line_label != NULL)
{
line_label->sy_frag = 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))
{
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 (exp.X_op == O_constant)
{
long repeat;
repeat = exp.X_add_number;
if (mult)
repeat *= mult;
bytes = repeat;
if (repeat <= 0)
{
if (! flag_mri || repeat < 0)
as_warn (".space repeat count is %s, ignored",
repeat ? "negative" : "zero");
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;
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
/* 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 (float_type)
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");
if (flag_mri)
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
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)
{
if (flag_mri)
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
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);
if (flag_mri)
mri_comment_end (stop, stopc);
ignore_rest_of_line ();
return;
}
}
while (--count >= 0)
{
char *p;
p = frag_more (flen);
memcpy (p, temp, (unsigned int) flen);
}
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
/* Handle the .struct pseudo-op, as found in MIPS assemblers. */
void
s_struct (ignore)
int ignore;
{
char *stop = NULL;
char stopc;
if (flag_mri)
stop = mri_comment_field (&stopc);
abs_section_offset = get_absolute_expression ();
subseg_set (absolute_section, 0);
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
void
s_text (ignore)
int ignore;
{
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
} /* s_text() */
void
demand_empty_rest_of_line ()
{
SKIP_WHITESPACE ();
if (is_end_of_line[(unsigned char) *input_line_pointer])
{
input_line_pointer++;
}
else
{
ignore_rest_of_line ();
}
/* Return having already swallowed end-of-line. */
} /* Return pointing just after end-of-line. */
void
ignore_rest_of_line () /* For suspect lines: gives warning. */
{
if (!is_end_of_line[(unsigned char) *input_line_pointer])
{
if (isprint (*input_line_pointer))
as_bad ("Rest of line ignored. First ignored character is `%c'.",
*input_line_pointer);
else
as_bad ("Rest of line ignored. First ignored character valued 0x%x.",
*input_line_pointer);
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]]);
}
/*
* pseudo_set()
*
* 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 (symbolP)
symbolS *symbolP;
{
expressionS exp;
#if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
int ext;
#endif /* OBJ_AOUT or OBJ_BOUT */
know (symbolP); /* NULL pointer is logic error. */
#if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
ext = S_IS_EXTERNAL (symbolP);
#endif /* OBJ_AOUT or OBJ_BOUT */
(void) expression (&exp);
if (exp.X_op == O_illegal)
as_bad ("illegal expression; zero assumed");
else if (exp.X_op == O_absent)
as_bad ("missing expression; zero assumed");
else if (exp.X_op == O_big)
as_bad ("%s number invalid; zero assumed",
exp.X_add_number > 0 ? "bignum" : "floating point");
else if (exp.X_op == O_subtract
&& (S_GET_SEGMENT (exp.X_add_symbol)
== S_GET_SEGMENT (exp.X_op_symbol))
&& SEG_NORMAL (S_GET_SEGMENT (exp.X_add_symbol))
&& exp.X_add_symbol->sy_frag == exp.X_op_symbol->sy_frag)
{
exp.X_op = O_constant;
exp.X_add_number = (S_GET_VALUE (exp.X_add_symbol)
- S_GET_VALUE (exp.X_op_symbol));
}
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);
#if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
if (ext)
S_SET_EXTERNAL (symbolP);
else
S_CLEAR_EXTERNAL (symbolP);
#endif /* OBJ_AOUT or OBJ_BOUT */
S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
symbolP->sy_frag = &zero_address_frag;
break;
case O_register:
S_SET_SEGMENT (symbolP, reg_section);
S_SET_VALUE (symbolP, (valueT) exp.X_add_number);
symbolP->sy_frag = &zero_address_frag;
break;
case O_symbol:
if (S_GET_SEGMENT (exp.X_add_symbol) == undefined_section
|| exp.X_add_number != 0)
symbolP->sy_value = exp;
else
{
symbolS *s = exp.X_add_symbol;
S_SET_SEGMENT (symbolP, S_GET_SEGMENT (s));
#if (defined (OBJ_AOUT) || defined (OBJ_BOUT)) && ! defined (BFD_ASSEMBLER)
if (ext)
S_SET_EXTERNAL (symbolP);
else
S_CLEAR_EXTERNAL (symbolP);
#endif /* OBJ_AOUT or OBJ_BOUT */
S_SET_VALUE (symbolP,
exp.X_add_number + S_GET_VALUE (s));
symbolP->sy_frag = s->sy_frag;
copy_symbol_attributes (symbolP, s);
}
break;
default:
/* The value is some complex expression.
FIXME: Should we set the segment to anything? */
symbolP->sy_value = exp;
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. */
static void
parse_mri_cons PARAMS ((expressionS *exp, unsigned int nbytes));
#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 PARAMS ((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 PARAMS ((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
/* worker to do .byte etc statements */
/* clobbers input_line_pointer, checks */
/* end-of-line. */
static void
cons_worker (nbytes, rva)
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 ())
{
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
return;
}
#ifdef md_cons_align
md_cons_align (nbytes);
#endif
c = 0;
do
{
if (flag_m68k_mri)
parse_mri_cons (&exp, (unsigned int) nbytes);
else
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. */
if (flag_mri)
mri_comment_end (stop, stopc);
demand_empty_rest_of_line ();
}
void
cons (size)
int size;
{
cons_worker (size, 0);
}
void
s_rva (size)
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 (exp, nbytes)
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;
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
&& exp->X_add_symbol->sy_value.X_op == O_big
&& exp->X_add_symbol->sy_value.X_add_number > 0)
{
int i;
unsigned long carry;
exp = &exp->X_add_symbol->sy_value;
/* 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; zero assumed");
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->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;
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))
{
valueT val;
int gencnt;
if (! exp->X_unsigned && exp->X_add_number < 0)
extra_digit = (valueT) -1;
val = (valueT) exp->X_add_number;
gencnt = 0;
do
{
generic_bignum[gencnt] = val & LITTLENUM_MASK;
val >>= LITTLENUM_NUMBER_OF_BITS;
++gencnt;
}
while (val != 0);
op = exp->X_op = O_big;
exp->X_add_number = gencnt;
}
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)
{
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 > 0)
{
--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 > 0)
{
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 > 0)
{
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.
This is easy for BFD. For other targets it can be more
complex. For very complex cases (currently, the HPPA and
NS32K), you can define TC_CONS_FIX_NEW to do whatever you
want. For simpler cases, you can define TC_CONS_RELOC to be
the name of the reloc code that should be stored in the fixS.
If neither is defined, the code uses NO_RELOC if it is
defined, and otherwise uses 0. */
#ifdef BFD_ASSEMBLER
#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
#else
#ifdef TC_CONS_FIX_NEW
TC_CONS_FIX_NEW (frag_now, p - frag_now->fr_literal, nbytes, exp);
#else
/* Figure out which reloc number to use. Use TC_CONS_RELOC if
it is defined, otherwise use NO_RELOC if it is defined,
otherwise use 0. */
#ifndef TC_CONS_RELOC
#ifdef NO_RELOC
#define TC_CONS_RELOC NO_RELOC
#else
#define TC_CONS_RELOC 0
#endif
#endif
fix_new_exp (frag_now, p - frag_now->fr_literal, (int) nbytes, exp, 0,
TC_CONS_RELOC);
#endif /* TC_CONS_FIX_NEW */
#endif /* BFD_ASSEMBLER */
}
}
#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 significat 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 */
hold = ++input_line_pointer; /* skip ':' */
(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);
} /* forever loop */
exp->X_add_number = value;
exp->X_op = O_constant;
exp->X_unsigned = 1;
} /* if looks like a bitfield */
} /* parse_bitfield_cons() */
#endif /* BITFIELD_CONS_EXPRESSIONS */
/* Handle an MRI style string expression. */
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
{
int scan = 0;
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++;
}
}
#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 (float_type, bytes)
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
* truncatation, 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 (float_type)
/* 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++ == ',');
--input_line_pointer; /* Put terminator back into stream. */
demand_empty_rest_of_line ();
} /* float_cons() */
/* Return the size of a LEB128 value */
static inline int
sizeof_sleb128 (value)
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 (value)
valueT value;
{
register int size = 0;
register unsigned byte;
do
{
byte = (value & 0x7f);
value >>= 7;
size += 1;
}
while (value != 0);
return size;
}
inline int
sizeof_leb128 (value, sign)
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 (p, value)
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 (p, value)
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;
}
inline int
output_leb128 (p, value, sign)
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 int
output_big_sleb128 (p, bignum, size)
char *p;
LITTLENUM_TYPE *bignum;
int size;
{
char *orig = p;
valueT val;
int loaded = 0;
unsigned byte;
/* Strip leading sign extensions off the bignum. */
while (size > 0 && bignum[size-1] == (LITTLENUM_TYPE)-1)
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)
{
if ((val == 0 && (byte & 0x40) == 0)
|| (~(val | ~(((valueT)1 << loaded) - 1)) == 0
&& (byte & 0x40) != 0))
byte |= 0x80;
}
if (orig)
*p = byte;
p++;
}
while (byte & 0x80);
return p - orig;
}
static int
output_big_uleb128 (p, bignum, size)
char *p;
LITTLENUM_TYPE *bignum;
int size;
{
char *orig = p;
valueT val;
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 inline int
output_big_leb128 (p, bignum, size, sign)
char *p;
LITTLENUM_TYPE *bignum;
int size, 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. */
void
emit_leb128_expr(exp, sign)
expressionS *exp;
int sign;
{
operatorT op = exp->X_op;
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; zero assumed");
exp->X_add_number = 0;
op = O_constant;
}
else if (op == O_register)
{
as_warn ("register value used as expression");
op = O_constant;
}
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 (sign)
int sign;
{
expressionS exp;
do {
expression (&exp);
emit_leb128_expr (&exp, sign);
} while (*input_line_pointer++ == ',');
input_line_pointer--;
demand_empty_rest_of_line ();
}
/*
* stringer()
*
* We read 0 or more ',' seperated, double-quoted strings.
*
* Caller should have checked need_pass_2 is FALSE because we don't check it.
*/
void
stringer (append_zero) /* 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;
#ifdef md_flush_pending_output
md_flush_pending_output ();
#endif
/*
* The following awkward logic is to parse ZERO or more strings,
* comma seperated. 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. */
}
while (c == ',' || c == '<' || c == '"')
{
SKIP_WHITESPACE ();
switch (*input_line_pointer)
{
case '\"':
++input_line_pointer; /*->1st char of string. */
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] == '\"');
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 ()
{
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, '?' assumed");
c = '?';
#endif /* ONLY_STANDARD_ESCAPES */
break;
} /* switch on escaped char */
break;
#endif /* ! defined (NO_STRING_ESCAPES) */
default:
break;
} /* switch on char */
return (c);
} /* next_char_of_string() */
static segT
get_segmented_expression (expP)
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; zero assumed");
expP->X_op = O_constant;
expP->X_add_number = 0;
retval = absolute_section;
}
return retval;
}
static segT
get_known_segmented_expression (expP)
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);
} /* get_known_segmented_expression() */
offsetT
get_absolute_expression ()
{
expressionS exp;
expression (&exp);
if (exp.X_op != O_constant)
{
if (exp.X_op != O_absent)
as_bad ("bad or irreducible absolute expression; zero assumed");
exp.X_add_number = 0;
}
return exp.X_add_number;
}
char /* return terminator */
get_absolute_expression_and_terminator (val_pointer)
long *val_pointer; /* return value of expression */
{
/* FIXME: val_pointer should probably be offsetT *. */
*val_pointer = (long) get_absolute_expression ();
return (*input_line_pointer++);
}
/*
* demand_copy_C_string()
*
* 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 (len_pointer)
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_copy_string()
*
* 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 (lenP)
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_warn ("Missing string");
retval = NULL;
ignore_rest_of_line ();
}
*lenP = len;
return (retval);
} /* demand_copy_string() */
/*
* is_it_end_of_statement()
*
* 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 ()
{
SKIP_WHITESPACE ();
return (is_end_of_line[(unsigned char) *input_line_pointer]);
} /* is_it_end_of_statement() */
void
equals (sym_name, reassign)
char *sym_name;
int reassign;
{
register symbolS *symbolP; /* symbol we are working with */
char *stop;
char stopc;
input_line_pointer++;
if (*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);
if (sym_name[0] == '.' && sym_name[1] == '\0')
{
/* Turn '. = mumble' into a .org mumble */
register segT segment;
expressionS exp;
segment = get_known_segmented_expression (&exp);
if (!need_pass_2)
do_org (segment, &exp, 0);
}
else
{
symbolP = symbol_find_or_make (sym_name);
/* Permit register names to be redefined. */
if (! reassign
&& S_IS_DEFINED (symbolP)
&& S_GET_SEGMENT (symbolP) != reg_section)
as_bad ("symbol `%s' already defined", S_GET_NAME (symbolP));
pseudo_set (symbolP);
}
if (flag_mri)
mri_comment_end (stop, stopc);
} /* equals() */
/* .include -- include a file at this point. */
/* ARGSUSED */
void
s_include (arg)
int arg;
{
char *newbuf;
char *filename;
int i;
FILE *try;
char *path;
if (! flag_m68k_mri)
filename = demand_copy_string (&i);
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, "r")))
{
fclose (try);
goto gotit;
}
}
free (path);
path = filename;
gotit:
/* malloc Storage leak when file is found on path. FIXME-SOMEDAY. */
register_dependency (path);
newbuf = input_scrub_include_file (path, input_line_pointer);
buffer_limit = input_scrub_next_buffer (&input_line_pointer);
} /* s_include() */
void
add_include_dir (path)
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;
} /* add_include_dir() */
void
s_ignore (arg)
int arg;
{
while (!is_end_of_line[(unsigned char) *input_line_pointer])
{
++input_line_pointer;
}
++input_line_pointer;
}
void
read_print_statistics (file)
FILE *file;
{
hash_print_statistics (file, "pseudo-op table", po_hash);
}
/* end of read.c */
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