1999-05-03 09:29:11 +02:00
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/* frags.c - manage frags -
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2001-03-09 00:24:26 +01:00
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Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000
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1999-05-03 09:29:11 +02:00
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Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "as.h"
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#include "subsegs.h"
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#include "obstack.h"
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extern fragS zero_address_frag;
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extern fragS bss_address_frag;
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/* Initialization for frag routines. */
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2000-08-31 20:36:18 +02:00
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1999-05-03 09:29:11 +02:00
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void
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frag_init ()
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{
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zero_address_frag.fr_type = rs_fill;
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bss_address_frag.fr_type = rs_fill;
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}
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/* Allocate a frag on the specified obstack.
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Call this routine from everywhere else, so that all the weird alignment
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hackery can be done in just one place. */
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2000-08-31 20:36:18 +02:00
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1999-05-03 09:29:11 +02:00
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fragS *
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frag_alloc (ob)
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struct obstack *ob;
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{
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fragS *ptr;
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int oalign;
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(void) obstack_alloc (ob, 0);
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oalign = obstack_alignment_mask (ob);
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obstack_alignment_mask (ob) = 0;
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ptr = (fragS *) obstack_alloc (ob, SIZEOF_STRUCT_FRAG);
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obstack_alignment_mask (ob) = oalign;
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memset (ptr, 0, SIZEOF_STRUCT_FRAG);
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return ptr;
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}
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2000-08-31 20:36:18 +02:00
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/* Try to augment current frag by nchars chars.
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If there is no room, close of the current frag with a ".fill 0"
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and begin a new frag. Unless the new frag has nchars chars available
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do not return. Do not set up any fields of *now_frag. */
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void
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1999-05-03 09:29:11 +02:00
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frag_grow (nchars)
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unsigned int nchars;
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{
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2001-11-14 18:43:32 +01:00
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/* Try really hard to grow the obstack. Creating a new obstack can
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disable expression optimisations that would otherwise occur if
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two symbols were located in the same obstack. */
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if (obstack_room (&frchain_now->frch_obstack) < nchars)
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obstack_make_room (& frchain_now->frch_obstack, 2 * nchars);
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1999-05-03 09:29:11 +02:00
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if (obstack_room (&frchain_now->frch_obstack) < nchars)
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{
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unsigned int n;
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long oldc;
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frag_wane (frag_now);
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frag_new (0);
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oldc = frchain_now->frch_obstack.chunk_size;
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frchain_now->frch_obstack.chunk_size = 2 * nchars + SIZEOF_STRUCT_FRAG;
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2000-05-02 02:12:52 +02:00
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if (frchain_now->frch_obstack.chunk_size > 0)
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while ((n = obstack_room (&frchain_now->frch_obstack)) < nchars
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&& (unsigned long) frchain_now->frch_obstack.chunk_size > nchars)
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{
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frag_wane (frag_now);
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frag_new (0);
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}
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1999-05-03 09:29:11 +02:00
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frchain_now->frch_obstack.chunk_size = oldc;
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}
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if (obstack_room (&frchain_now->frch_obstack) < nchars)
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* read.c: Standardize error/warning messages - don't capitalise, no
final period or newline, don't say "ignored" or "zero assumed" for
as_bad messages. In some cases, change the wording to that used
elsewhere for similar messages.
* app.c, as.c, atof-generic.c, cgen.c, cond.c, depend.c, dwarf2dbg.c,
ecoff.c, expr.c, frags.c, input-file.c, input-scrub.c, listing.c,
output-file.c, stabs.c, subsegs.c, symbols.c, write.c: Likewise.
* ecoff.c (ecoff_directive_end): Test for missing name by
comparing input line pointers rather than reading string.
(ecoff_directive_ent): Likewise.
* read.c (s_set): Likewise.
(s_align): Report a warning rather than an error for
alignment too large.
(s_comm): Check for missing symbol name.
(s_lcomm_internal): Likewise.
(s_lsym): Likewise.
(s_globl): Use is_end_of_line instead of looking for '\n'.
(s_lcomm_internal): Likewise.
(ignore_rest_of_line): Report a warning rather than an error.
2001-08-01 03:44:25 +02:00
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as_fatal (_("can't extend frag %u chars"), nchars);
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1999-05-03 09:29:11 +02:00
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}
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2000-08-31 20:36:18 +02:00
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/* Call this to close off a completed frag, and start up a new (empty)
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frag, in the same subsegment as the old frag.
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[frchain_now remains the same but frag_now is updated.]
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Because this calculates the correct value of fr_fix by
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looking at the obstack 'frags', it needs to know how many
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characters at the end of the old frag belong to the maximal
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variable part; The rest must belong to fr_fix.
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It doesn't actually set up the old frag's fr_var. You may have
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set fr_var == 1, but allocated 10 chars to the end of the frag;
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In this case you pass old_frags_var_max_size == 10.
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In fact, you may use fr_var for something totally unrelated to the
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size of the variable part of the frag; None of the generic frag
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handling code makes use of fr_var.
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Make a new frag, initialising some components. Link new frag at end
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of frchain_now. */
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void
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1999-05-03 09:29:11 +02:00
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frag_new (old_frags_var_max_size)
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/* Number of chars (already allocated on obstack frags) in
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2000-08-31 20:36:18 +02:00
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variable_length part of frag. */
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1999-05-03 09:29:11 +02:00
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int old_frags_var_max_size;
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{
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fragS *former_last_fragP;
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frchainS *frchP;
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assert (frchain_now->frch_last == frag_now);
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/* Fix up old frag's fr_fix. */
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2000-02-03 19:20:23 +01:00
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frag_now->fr_fix = frag_now_fix_octets () - old_frags_var_max_size;
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1999-05-03 09:29:11 +02:00
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/* Make sure its type is valid. */
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assert (frag_now->fr_type != 0);
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/* This will align the obstack so the next struct we allocate on it
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2000-08-31 20:36:18 +02:00
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will begin at a correct boundary. */
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1999-05-03 09:29:11 +02:00
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obstack_finish (&frchain_now->frch_obstack);
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frchP = frchain_now;
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know (frchP);
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former_last_fragP = frchP->frch_last;
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assert (former_last_fragP != 0);
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assert (former_last_fragP == frag_now);
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frag_now = frag_alloc (&frchP->frch_obstack);
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as_where (&frag_now->fr_file, &frag_now->fr_line);
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/* Generally, frag_now->points to an address rounded up to next
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alignment. However, characters will add to obstack frags
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IMMEDIATELY after the struct frag, even if they are not starting
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2000-08-31 20:36:18 +02:00
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at an alignment address. */
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1999-05-03 09:29:11 +02:00
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former_last_fragP->fr_next = frag_now;
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frchP->frch_last = frag_now;
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#ifndef NO_LISTING
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{
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extern struct list_info_struct *listing_tail;
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frag_now->line = listing_tail;
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}
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#endif
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assert (frchain_now->frch_last == frag_now);
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frag_now->fr_next = NULL;
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2000-08-31 20:36:18 +02:00
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}
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1999-05-03 09:29:11 +02:00
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2000-08-31 20:36:18 +02:00
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/* Start a new frag unless we have n more chars of room in the current frag.
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Close off the old frag with a .fill 0.
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Return the address of the 1st char to write into. Advance
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frag_now_growth past the new chars. */
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1999-05-03 09:29:11 +02:00
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char *
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frag_more (nchars)
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int nchars;
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{
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register char *retval;
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if (now_seg == absolute_section)
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{
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as_bad (_("attempt to allocate data in absolute section"));
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subseg_set (text_section, 0);
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}
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if (mri_common_symbol != NULL)
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{
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as_bad (_("attempt to allocate data in common section"));
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mri_common_symbol = NULL;
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}
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frag_grow (nchars);
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retval = obstack_next_free (&frchain_now->frch_obstack);
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obstack_blank_fast (&frchain_now->frch_obstack, nchars);
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return (retval);
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2000-08-31 20:36:18 +02:00
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}
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1999-05-03 09:29:11 +02:00
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2000-08-31 20:36:18 +02:00
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/* Start a new frag unless we have max_chars more chars of room in the
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current frag. Close off the old frag with a .fill 0.
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Set up a machine_dependent relaxable frag, then start a new frag.
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Return the address of the 1st char of the var part of the old frag
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to write into. */
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1999-05-03 09:29:11 +02:00
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char *
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frag_var (type, max_chars, var, subtype, symbol, offset, opcode)
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relax_stateT type;
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int max_chars;
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int var;
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relax_substateT subtype;
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symbolS *symbol;
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offsetT offset;
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char *opcode;
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{
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register char *retval;
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frag_grow (max_chars);
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retval = obstack_next_free (&frchain_now->frch_obstack);
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obstack_blank_fast (&frchain_now->frch_obstack, max_chars);
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frag_now->fr_var = var;
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frag_now->fr_type = type;
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frag_now->fr_subtype = subtype;
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frag_now->fr_symbol = symbol;
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frag_now->fr_offset = offset;
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frag_now->fr_opcode = opcode;
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#ifdef USING_CGEN
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frag_now->fr_cgen.insn = 0;
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frag_now->fr_cgen.opindex = 0;
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frag_now->fr_cgen.opinfo = 0;
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#endif
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#ifdef TC_FRAG_INIT
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TC_FRAG_INIT (frag_now);
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#endif
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as_where (&frag_now->fr_file, &frag_now->fr_line);
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frag_new (max_chars);
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return (retval);
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}
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2000-08-31 20:36:18 +02:00
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/* OVE: This variant of frag_var assumes that space for the tail has been
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allocated by caller.
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No call to frag_grow is done. */
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1999-05-03 09:29:11 +02:00
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char *
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frag_variant (type, max_chars, var, subtype, symbol, offset, opcode)
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relax_stateT type;
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int max_chars;
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int var;
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relax_substateT subtype;
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symbolS *symbol;
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offsetT offset;
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char *opcode;
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{
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register char *retval;
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retval = obstack_next_free (&frchain_now->frch_obstack);
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frag_now->fr_var = var;
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frag_now->fr_type = type;
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frag_now->fr_subtype = subtype;
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frag_now->fr_symbol = symbol;
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frag_now->fr_offset = offset;
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frag_now->fr_opcode = opcode;
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#ifdef USING_CGEN
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frag_now->fr_cgen.insn = 0;
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frag_now->fr_cgen.opindex = 0;
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frag_now->fr_cgen.opinfo = 0;
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#endif
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#ifdef TC_FRAG_INIT
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TC_FRAG_INIT (frag_now);
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#endif
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as_where (&frag_now->fr_file, &frag_now->fr_line);
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frag_new (max_chars);
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return (retval);
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2000-08-31 20:36:18 +02:00
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}
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1999-05-03 09:29:11 +02:00
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2000-08-31 20:36:18 +02:00
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/* Reduce the variable end of a frag to a harmless state. */
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void
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1999-05-03 09:29:11 +02:00
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frag_wane (fragP)
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register fragS *fragP;
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{
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fragP->fr_type = rs_fill;
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fragP->fr_offset = 0;
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fragP->fr_var = 0;
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}
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/* Make an alignment frag. The size of this frag will be adjusted to
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force the next frag to have the appropriate alignment. ALIGNMENT
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is the power of two to which to align. FILL_CHARACTER is the
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character to use to fill in any bytes which are skipped. MAX is
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the maximum number of characters to skip when doing the alignment,
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or 0 if there is no maximum. */
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2000-08-31 20:36:18 +02:00
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void
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1999-05-03 09:29:11 +02:00
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frag_align (alignment, fill_character, max)
|
|
|
|
|
int alignment;
|
|
|
|
|
int fill_character;
|
|
|
|
|
int max;
|
|
|
|
|
{
|
|
|
|
|
if (now_seg == absolute_section)
|
|
|
|
|
{
|
|
|
|
|
addressT new_off;
|
2000-07-22 06:23:48 +02:00
|
|
|
|
addressT mask;
|
1999-05-03 09:29:11 +02:00
|
|
|
|
|
2000-08-31 20:36:18 +02:00
|
|
|
|
mask = (~(addressT) 0) << alignment;
|
|
|
|
|
new_off = (abs_section_offset + ~mask) & mask;
|
1999-05-03 09:29:11 +02:00
|
|
|
|
if (max == 0 || new_off - abs_section_offset <= (addressT) max)
|
|
|
|
|
abs_section_offset = new_off;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
char *p;
|
|
|
|
|
|
|
|
|
|
p = frag_var (rs_align, 1, 1, (relax_substateT) max,
|
|
|
|
|
(symbolS *) 0, (offsetT) alignment, (char *) 0);
|
|
|
|
|
*p = fill_character;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Make an alignment frag like frag_align, but fill with a repeating
|
|
|
|
|
pattern rather than a single byte. ALIGNMENT is the power of two
|
|
|
|
|
to which to align. FILL_PATTERN is the fill pattern to repeat in
|
|
|
|
|
the bytes which are skipped. N_FILL is the number of bytes in
|
|
|
|
|
FILL_PATTERN. MAX is the maximum number of characters to skip when
|
|
|
|
|
doing the alignment, or 0 if there is no maximum. */
|
|
|
|
|
|
2000-08-31 20:36:18 +02:00
|
|
|
|
void
|
1999-05-03 09:29:11 +02:00
|
|
|
|
frag_align_pattern (alignment, fill_pattern, n_fill, max)
|
|
|
|
|
int alignment;
|
|
|
|
|
const char *fill_pattern;
|
|
|
|
|
int n_fill;
|
|
|
|
|
int max;
|
|
|
|
|
{
|
|
|
|
|
char *p;
|
|
|
|
|
|
|
|
|
|
p = frag_var (rs_align, n_fill, n_fill, (relax_substateT) max,
|
|
|
|
|
(symbolS *) 0, (offsetT) alignment, (char *) 0);
|
|
|
|
|
memcpy (p, fill_pattern, n_fill);
|
|
|
|
|
}
|
|
|
|
|
|
2000-12-28 11:07:56 +01:00
|
|
|
|
/* The NOP_OPCODE is for the alignment fill value. Fill it with a nop
|
|
|
|
|
instruction so that the disassembler does not choke on it. */
|
|
|
|
|
#ifndef NOP_OPCODE
|
|
|
|
|
#define NOP_OPCODE 0x00
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/* Use this to restrict the amount of memory allocated for representing
|
|
|
|
|
the alignment code. Needs to be large enough to hold any fixed sized
|
|
|
|
|
prologue plus the replicating portion. */
|
|
|
|
|
#ifndef MAX_MEM_FOR_RS_ALIGN_CODE
|
|
|
|
|
/* Assume that if HANDLE_ALIGN is not defined then no special action
|
|
|
|
|
is required to code fill, which means that we get just repeat the
|
|
|
|
|
one NOP_OPCODE byte. */
|
|
|
|
|
# ifndef HANDLE_ALIGN
|
|
|
|
|
# define MAX_MEM_FOR_RS_ALIGN_CODE 1
|
|
|
|
|
# else
|
|
|
|
|
# define MAX_MEM_FOR_RS_ALIGN_CODE ((1 << alignment) - 1)
|
|
|
|
|
# endif
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
frag_align_code (alignment, max)
|
|
|
|
|
int alignment;
|
|
|
|
|
int max;
|
|
|
|
|
{
|
|
|
|
|
char *p;
|
|
|
|
|
|
|
|
|
|
p = frag_var (rs_align_code, MAX_MEM_FOR_RS_ALIGN_CODE, 1,
|
|
|
|
|
(relax_substateT) max, (symbolS *) 0,
|
|
|
|
|
(offsetT) alignment, (char *) 0);
|
|
|
|
|
*p = NOP_OPCODE;
|
|
|
|
|
}
|
|
|
|
|
|
1999-05-03 09:29:11 +02:00
|
|
|
|
addressT
|
2000-02-03 19:20:23 +01:00
|
|
|
|
frag_now_fix_octets ()
|
1999-05-03 09:29:11 +02:00
|
|
|
|
{
|
|
|
|
|
if (now_seg == absolute_section)
|
|
|
|
|
return abs_section_offset;
|
2000-02-03 19:20:23 +01:00
|
|
|
|
|
2000-08-31 20:36:18 +02:00
|
|
|
|
return ((char *) obstack_next_free (&frchain_now->frch_obstack)
|
|
|
|
|
- frag_now->fr_literal);
|
2000-02-03 19:20:23 +01:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
addressT
|
|
|
|
|
frag_now_fix ()
|
|
|
|
|
{
|
2000-08-31 20:36:18 +02:00
|
|
|
|
return frag_now_fix_octets () / OCTETS_PER_BYTE;
|
1999-05-03 09:29:11 +02:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
frag_append_1_char (datum)
|
|
|
|
|
int datum;
|
|
|
|
|
{
|
|
|
|
|
if (obstack_room (&frchain_now->frch_obstack) <= 1)
|
|
|
|
|
{
|
|
|
|
|
frag_wane (frag_now);
|
|
|
|
|
frag_new (0);
|
|
|
|
|
}
|
|
|
|
|
obstack_1grow (&frchain_now->frch_obstack, datum);
|
|
|
|
|
}
|