1358 lines
35 KiB
C
1358 lines
35 KiB
C
/* This module handles expression trees.
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Copyright 1991-2013 Free Software Foundation, Inc.
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Written by Steve Chamberlain of Cygnus Support <sac@cygnus.com>.
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This file is part of the GNU Binutils.
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This program 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 3 of the License, or
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(at your option) any later version.
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This program 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 this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* This module is in charge of working out the contents of expressions.
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It has to keep track of the relative/absness of a symbol etc. This
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is done by keeping all values in a struct (an etree_value_type)
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which contains a value, a section to which it is relative and a
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valid bit. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfdlink.h"
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#include "ld.h"
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#include "ldmain.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldlex.h"
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#include <ldgram.h>
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#include "ldlang.h"
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#include "libiberty.h"
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#include "safe-ctype.h"
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static void exp_fold_tree_1 (etree_type *);
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static bfd_vma align_n (bfd_vma, bfd_vma);
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segment_type *segments;
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struct ldexp_control expld;
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/* Print the string representation of the given token. Surround it
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with spaces if INFIX_P is TRUE. */
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static void
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exp_print_token (token_code_type code, int infix_p)
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{
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static const struct
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{
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token_code_type code;
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const char * name;
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}
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table[] =
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{
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{ INT, "int" },
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{ NAME, "NAME" },
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{ PLUSEQ, "+=" },
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{ MINUSEQ, "-=" },
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{ MULTEQ, "*=" },
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{ DIVEQ, "/=" },
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{ LSHIFTEQ, "<<=" },
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{ RSHIFTEQ, ">>=" },
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{ ANDEQ, "&=" },
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{ OREQ, "|=" },
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{ OROR, "||" },
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{ ANDAND, "&&" },
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{ EQ, "==" },
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{ NE, "!=" },
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{ LE, "<=" },
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{ GE, ">=" },
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{ LSHIFT, "<<" },
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{ RSHIFT, ">>" },
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{ LOG2CEIL, "LOG2CEIL" },
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{ ALIGN_K, "ALIGN" },
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{ BLOCK, "BLOCK" },
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{ QUAD, "QUAD" },
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{ SQUAD, "SQUAD" },
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{ LONG, "LONG" },
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{ SHORT, "SHORT" },
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{ BYTE, "BYTE" },
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{ SECTIONS, "SECTIONS" },
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{ SIZEOF_HEADERS, "SIZEOF_HEADERS" },
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{ MEMORY, "MEMORY" },
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{ DEFINED, "DEFINED" },
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{ TARGET_K, "TARGET" },
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{ SEARCH_DIR, "SEARCH_DIR" },
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{ MAP, "MAP" },
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{ ENTRY, "ENTRY" },
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{ NEXT, "NEXT" },
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{ ALIGNOF, "ALIGNOF" },
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{ SIZEOF, "SIZEOF" },
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{ ADDR, "ADDR" },
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{ LOADADDR, "LOADADDR" },
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{ CONSTANT, "CONSTANT" },
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{ ABSOLUTE, "ABSOLUTE" },
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{ MAX_K, "MAX" },
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{ MIN_K, "MIN" },
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{ ASSERT_K, "ASSERT" },
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{ REL, "relocatable" },
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{ DATA_SEGMENT_ALIGN, "DATA_SEGMENT_ALIGN" },
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{ DATA_SEGMENT_RELRO_END, "DATA_SEGMENT_RELRO_END" },
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{ DATA_SEGMENT_END, "DATA_SEGMENT_END" },
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{ ORIGIN, "ORIGIN" },
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{ LENGTH, "LENGTH" },
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{ SEGMENT_START, "SEGMENT_START" }
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};
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unsigned int idx;
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for (idx = 0; idx < ARRAY_SIZE (table); idx++)
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if (table[idx].code == code)
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break;
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if (infix_p)
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fputc (' ', config.map_file);
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if (idx < ARRAY_SIZE (table))
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fputs (table[idx].name, config.map_file);
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else if (code < 127)
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fputc (code, config.map_file);
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else
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fprintf (config.map_file, "<code %d>", code);
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if (infix_p)
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fputc (' ', config.map_file);
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}
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static void
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make_log2ceil (void)
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{
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bfd_vma value = expld.result.value;
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bfd_vma result = -1;
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bfd_boolean round_up = FALSE;
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do
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{
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result++;
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/* If more than one bit is set in the value we will need to round up. */
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if ((value > 1) && (value & 1))
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round_up = TRUE;
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}
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while (value >>= 1);
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if (round_up)
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result += 1;
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expld.result.section = NULL;
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expld.result.value = result;
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}
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static void
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make_abs (void)
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{
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if (expld.result.section != NULL)
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expld.result.value += expld.result.section->vma;
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expld.result.section = bfd_abs_section_ptr;
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}
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static void
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new_abs (bfd_vma value)
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{
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expld.result.valid_p = TRUE;
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expld.result.section = bfd_abs_section_ptr;
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expld.result.value = value;
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expld.result.str = NULL;
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}
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etree_type *
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exp_intop (bfd_vma value)
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{
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etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->value));
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new_e->type.node_code = INT;
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new_e->type.filename = ldlex_filename ();
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new_e->type.lineno = lineno;
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new_e->value.value = value;
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new_e->value.str = NULL;
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new_e->type.node_class = etree_value;
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return new_e;
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}
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etree_type *
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exp_bigintop (bfd_vma value, char *str)
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{
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etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->value));
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new_e->type.node_code = INT;
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new_e->type.filename = ldlex_filename ();
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new_e->type.lineno = lineno;
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new_e->value.value = value;
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new_e->value.str = str;
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new_e->type.node_class = etree_value;
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return new_e;
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}
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/* Build an expression representing an unnamed relocatable value. */
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etree_type *
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exp_relop (asection *section, bfd_vma value)
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{
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etree_type *new_e = (etree_type *) stat_alloc (sizeof (new_e->rel));
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new_e->type.node_code = REL;
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new_e->type.filename = ldlex_filename ();
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new_e->type.lineno = lineno;
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new_e->type.node_class = etree_rel;
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new_e->rel.section = section;
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new_e->rel.value = value;
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return new_e;
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}
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static void
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new_number (bfd_vma value)
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{
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expld.result.valid_p = TRUE;
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expld.result.value = value;
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expld.result.str = NULL;
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expld.result.section = NULL;
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}
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static void
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new_rel (bfd_vma value, asection *section)
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{
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expld.result.valid_p = TRUE;
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expld.result.value = value;
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expld.result.str = NULL;
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expld.result.section = section;
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}
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static void
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new_rel_from_abs (bfd_vma value)
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{
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asection *s = expld.section;
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if (s == bfd_abs_section_ptr && expld.phase == lang_final_phase_enum)
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s = section_for_dot ();
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expld.result.valid_p = TRUE;
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expld.result.value = value - s->vma;
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expld.result.str = NULL;
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expld.result.section = s;
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}
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static void
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fold_unary (etree_type *tree)
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{
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exp_fold_tree_1 (tree->unary.child);
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if (expld.result.valid_p)
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{
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switch (tree->type.node_code)
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{
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case ALIGN_K:
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if (expld.phase != lang_first_phase_enum)
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new_rel_from_abs (align_n (expld.dot, expld.result.value));
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else
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expld.result.valid_p = FALSE;
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break;
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case ABSOLUTE:
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make_abs ();
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break;
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case LOG2CEIL:
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make_log2ceil ();
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break;
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case '~':
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expld.result.value = ~expld.result.value;
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break;
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case '!':
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expld.result.value = !expld.result.value;
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break;
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case '-':
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expld.result.value = -expld.result.value;
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break;
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case NEXT:
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/* Return next place aligned to value. */
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if (expld.phase != lang_first_phase_enum)
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{
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make_abs ();
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expld.result.value = align_n (expld.dot, expld.result.value);
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}
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else
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expld.result.valid_p = FALSE;
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break;
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case DATA_SEGMENT_END:
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if (expld.phase == lang_first_phase_enum
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|| expld.section != bfd_abs_section_ptr)
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{
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expld.result.valid_p = FALSE;
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}
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else if (expld.dataseg.phase == exp_dataseg_align_seen
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|| expld.dataseg.phase == exp_dataseg_relro_seen)
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{
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expld.dataseg.phase = exp_dataseg_end_seen;
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expld.dataseg.end = expld.result.value;
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}
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else if (expld.dataseg.phase == exp_dataseg_done
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|| expld.dataseg.phase == exp_dataseg_adjust
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|| expld.dataseg.phase == exp_dataseg_relro_adjust)
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{
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/* OK. */
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}
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else
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expld.result.valid_p = FALSE;
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break;
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default:
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FAIL ();
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break;
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}
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}
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}
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static void
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fold_binary (etree_type *tree)
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{
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etree_value_type lhs;
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exp_fold_tree_1 (tree->binary.lhs);
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/* The SEGMENT_START operator is special because its first
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operand is a string, not the name of a symbol. Note that the
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operands have been swapped, so binary.lhs is second (default)
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operand, binary.rhs is first operand. */
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if (expld.result.valid_p && tree->type.node_code == SEGMENT_START)
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{
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const char *segment_name;
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segment_type *seg;
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/* Check to see if the user has overridden the default
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value. */
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segment_name = tree->binary.rhs->name.name;
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for (seg = segments; seg; seg = seg->next)
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if (strcmp (seg->name, segment_name) == 0)
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{
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if (!seg->used
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&& config.magic_demand_paged
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&& (seg->value % config.maxpagesize) != 0)
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einfo (_("%P: warning: address of `%s' isn't multiple of maximum page size\n"),
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segment_name);
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seg->used = TRUE;
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new_rel_from_abs (seg->value);
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break;
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}
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return;
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}
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lhs = expld.result;
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exp_fold_tree_1 (tree->binary.rhs);
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expld.result.valid_p &= lhs.valid_p;
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if (expld.result.valid_p)
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{
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if (lhs.section != expld.result.section)
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{
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/* If the values are from different sections, and neither is
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just a number, make both the source arguments absolute. */
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if (expld.result.section != NULL
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&& lhs.section != NULL)
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{
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make_abs ();
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lhs.value += lhs.section->vma;
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lhs.section = bfd_abs_section_ptr;
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}
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/* If the rhs is just a number, keep the lhs section. */
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else if (expld.result.section == NULL)
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{
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expld.result.section = lhs.section;
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/* Make this NULL so that we know one of the operands
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was just a number, for later tests. */
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lhs.section = NULL;
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}
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}
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/* At this point we know that both operands have the same
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section, or at least one of them is a plain number. */
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switch (tree->type.node_code)
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{
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/* Arithmetic operators, bitwise AND, bitwise OR and XOR
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keep the section of one of their operands only when the
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other operand is a plain number. Losing the section when
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operating on two symbols, ie. a result of a plain number,
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is required for subtraction and XOR. It's justifiable
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for the other operations on the grounds that adding,
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multiplying etc. two section relative values does not
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really make sense unless they are just treated as
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numbers.
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The same argument could be made for many expressions
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involving one symbol and a number. For example,
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"1 << x" and "100 / x" probably should not be given the
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section of x. The trouble is that if we fuss about such
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things the rules become complex and it is onerous to
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document ld expression evaluation. */
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#define BOP(x, y) \
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case x: \
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expld.result.value = lhs.value y expld.result.value; \
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if (expld.result.section == lhs.section) \
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expld.result.section = NULL; \
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break;
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/* Comparison operators, logical AND, and logical OR always
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return a plain number. */
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#define BOPN(x, y) \
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case x: \
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expld.result.value = lhs.value y expld.result.value; \
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expld.result.section = NULL; \
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break;
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BOP ('+', +);
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BOP ('*', *);
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BOP ('-', -);
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BOP (LSHIFT, <<);
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BOP (RSHIFT, >>);
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BOP ('&', &);
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BOP ('^', ^);
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BOP ('|', |);
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BOPN (EQ, ==);
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BOPN (NE, !=);
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BOPN ('<', <);
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BOPN ('>', >);
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BOPN (LE, <=);
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BOPN (GE, >=);
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BOPN (ANDAND, &&);
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BOPN (OROR, ||);
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case '%':
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if (expld.result.value != 0)
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expld.result.value = ((bfd_signed_vma) lhs.value
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% (bfd_signed_vma) expld.result.value);
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else if (expld.phase != lang_mark_phase_enum)
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einfo (_("%F%S %% by zero\n"), tree->binary.rhs);
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if (expld.result.section == lhs.section)
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expld.result.section = NULL;
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break;
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case '/':
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if (expld.result.value != 0)
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expld.result.value = ((bfd_signed_vma) lhs.value
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/ (bfd_signed_vma) expld.result.value);
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else if (expld.phase != lang_mark_phase_enum)
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einfo (_("%F%S / by zero\n"), tree->binary.rhs);
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if (expld.result.section == lhs.section)
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expld.result.section = NULL;
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break;
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case MAX_K:
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if (lhs.value > expld.result.value)
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expld.result.value = lhs.value;
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break;
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case MIN_K:
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if (lhs.value < expld.result.value)
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expld.result.value = lhs.value;
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break;
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case ALIGN_K:
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expld.result.value = align_n (lhs.value, expld.result.value);
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break;
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case DATA_SEGMENT_ALIGN:
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expld.dataseg.relro = exp_dataseg_relro_start;
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if (expld.phase == lang_first_phase_enum
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|| expld.section != bfd_abs_section_ptr)
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expld.result.valid_p = FALSE;
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else
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{
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bfd_vma maxpage = lhs.value;
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bfd_vma commonpage = expld.result.value;
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expld.result.value = align_n (expld.dot, maxpage);
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if (expld.dataseg.phase == exp_dataseg_relro_adjust)
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expld.result.value = expld.dataseg.base;
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else if (expld.dataseg.phase == exp_dataseg_adjust)
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{
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if (commonpage < maxpage)
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expld.result.value += ((expld.dot + commonpage - 1)
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& (maxpage - commonpage));
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}
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else
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{
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expld.result.value += expld.dot & (maxpage - 1);
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if (expld.dataseg.phase == exp_dataseg_done)
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{
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/* OK. */
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}
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else if (expld.dataseg.phase == exp_dataseg_none)
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{
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expld.dataseg.phase = exp_dataseg_align_seen;
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expld.dataseg.min_base = expld.dot;
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expld.dataseg.base = expld.result.value;
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expld.dataseg.pagesize = commonpage;
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expld.dataseg.maxpagesize = maxpage;
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expld.dataseg.relro_end = 0;
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}
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else
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expld.result.valid_p = FALSE;
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}
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}
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break;
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case DATA_SEGMENT_RELRO_END:
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expld.dataseg.relro = exp_dataseg_relro_end;
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if (expld.phase == lang_first_phase_enum
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|| expld.section != bfd_abs_section_ptr)
|
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expld.result.valid_p = FALSE;
|
|
else if (expld.dataseg.phase == exp_dataseg_align_seen
|
|
|| expld.dataseg.phase == exp_dataseg_adjust
|
|
|| expld.dataseg.phase == exp_dataseg_relro_adjust
|
|
|| expld.dataseg.phase == exp_dataseg_done)
|
|
{
|
|
if (expld.dataseg.phase == exp_dataseg_align_seen
|
|
|| expld.dataseg.phase == exp_dataseg_relro_adjust)
|
|
expld.dataseg.relro_end = lhs.value + expld.result.value;
|
|
|
|
if (expld.dataseg.phase == exp_dataseg_relro_adjust
|
|
&& (expld.dataseg.relro_end
|
|
& (expld.dataseg.pagesize - 1)))
|
|
{
|
|
expld.dataseg.relro_end += expld.dataseg.pagesize - 1;
|
|
expld.dataseg.relro_end &= ~(expld.dataseg.pagesize - 1);
|
|
expld.result.value = (expld.dataseg.relro_end
|
|
- expld.result.value);
|
|
}
|
|
else
|
|
expld.result.value = lhs.value;
|
|
|
|
if (expld.dataseg.phase == exp_dataseg_align_seen)
|
|
expld.dataseg.phase = exp_dataseg_relro_seen;
|
|
}
|
|
else
|
|
expld.result.valid_p = FALSE;
|
|
break;
|
|
|
|
default:
|
|
FAIL ();
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
fold_trinary (etree_type *tree)
|
|
{
|
|
exp_fold_tree_1 (tree->trinary.cond);
|
|
if (expld.result.valid_p)
|
|
exp_fold_tree_1 (expld.result.value
|
|
? tree->trinary.lhs
|
|
: tree->trinary.rhs);
|
|
}
|
|
|
|
static void
|
|
fold_name (etree_type *tree)
|
|
{
|
|
memset (&expld.result, 0, sizeof (expld.result));
|
|
|
|
switch (tree->type.node_code)
|
|
{
|
|
case SIZEOF_HEADERS:
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
bfd_vma hdr_size = 0;
|
|
/* Don't find the real header size if only marking sections;
|
|
The bfd function may cache incorrect data. */
|
|
if (expld.phase != lang_mark_phase_enum)
|
|
hdr_size = bfd_sizeof_headers (link_info.output_bfd, &link_info);
|
|
new_number (hdr_size);
|
|
}
|
|
break;
|
|
|
|
case DEFINED:
|
|
if (expld.phase == lang_first_phase_enum)
|
|
lang_track_definedness (tree->name.name);
|
|
else
|
|
{
|
|
struct bfd_link_hash_entry *h;
|
|
int def_iteration
|
|
= lang_symbol_definition_iteration (tree->name.name);
|
|
|
|
h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
|
|
&link_info,
|
|
tree->name.name,
|
|
FALSE, FALSE, TRUE);
|
|
new_number (h != NULL
|
|
&& (h->type == bfd_link_hash_defined
|
|
|| h->type == bfd_link_hash_defweak
|
|
|| h->type == bfd_link_hash_common)
|
|
&& (def_iteration == lang_statement_iteration
|
|
|| def_iteration == -1));
|
|
}
|
|
break;
|
|
|
|
case NAME:
|
|
if (expld.assign_name != NULL
|
|
&& strcmp (expld.assign_name, tree->name.name) == 0)
|
|
expld.assign_name = NULL;
|
|
if (expld.phase == lang_first_phase_enum)
|
|
;
|
|
else if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
|
|
new_rel_from_abs (expld.dot);
|
|
else
|
|
{
|
|
struct bfd_link_hash_entry *h;
|
|
|
|
h = bfd_wrapped_link_hash_lookup (link_info.output_bfd,
|
|
&link_info,
|
|
tree->name.name,
|
|
TRUE, FALSE, TRUE);
|
|
if (!h)
|
|
einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
|
|
else if (h->type == bfd_link_hash_defined
|
|
|| h->type == bfd_link_hash_defweak)
|
|
{
|
|
asection *output_section;
|
|
|
|
output_section = h->u.def.section->output_section;
|
|
if (output_section == NULL)
|
|
{
|
|
if (expld.phase == lang_mark_phase_enum)
|
|
new_rel (h->u.def.value, h->u.def.section);
|
|
else
|
|
einfo (_("%X%S: unresolvable symbol `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
}
|
|
else if (output_section == bfd_abs_section_ptr
|
|
&& (expld.section != bfd_abs_section_ptr
|
|
|| config.sane_expr))
|
|
new_number (h->u.def.value + h->u.def.section->output_offset);
|
|
else
|
|
new_rel (h->u.def.value + h->u.def.section->output_offset,
|
|
output_section);
|
|
}
|
|
else if (expld.phase == lang_final_phase_enum
|
|
|| (expld.phase != lang_mark_phase_enum
|
|
&& expld.assigning_to_dot))
|
|
einfo (_("%F%S: undefined symbol `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
else if (h->type == bfd_link_hash_new)
|
|
{
|
|
h->type = bfd_link_hash_undefined;
|
|
h->u.undef.abfd = NULL;
|
|
if (h->u.undef.next == NULL && h != link_info.hash->undefs_tail)
|
|
bfd_link_add_undef (link_info.hash, h);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case ADDR:
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
lang_output_section_statement_type *os;
|
|
|
|
os = lang_output_section_find (tree->name.name);
|
|
if (os == NULL)
|
|
{
|
|
if (expld.phase == lang_final_phase_enum)
|
|
einfo (_("%F%S: undefined section `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
}
|
|
else if (os->processed_vma)
|
|
new_rel (0, os->bfd_section);
|
|
}
|
|
break;
|
|
|
|
case LOADADDR:
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
lang_output_section_statement_type *os;
|
|
|
|
os = lang_output_section_find (tree->name.name);
|
|
if (os == NULL)
|
|
{
|
|
if (expld.phase == lang_final_phase_enum)
|
|
einfo (_("%F%S: undefined section `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
}
|
|
else if (os->processed_lma)
|
|
{
|
|
if (os->load_base == NULL)
|
|
new_abs (os->bfd_section->lma);
|
|
else
|
|
{
|
|
exp_fold_tree_1 (os->load_base);
|
|
if (expld.result.valid_p)
|
|
make_abs ();
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case SIZEOF:
|
|
case ALIGNOF:
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
lang_output_section_statement_type *os;
|
|
|
|
os = lang_output_section_find (tree->name.name);
|
|
if (os == NULL)
|
|
{
|
|
if (expld.phase == lang_final_phase_enum)
|
|
einfo (_("%F%S: undefined section `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
new_number (0);
|
|
}
|
|
else if (os->bfd_section != NULL)
|
|
{
|
|
bfd_vma val;
|
|
|
|
if (tree->type.node_code == SIZEOF)
|
|
val = (os->bfd_section->size
|
|
/ bfd_octets_per_byte (link_info.output_bfd));
|
|
else
|
|
val = (bfd_vma)1 << os->bfd_section->alignment_power;
|
|
|
|
new_number (val);
|
|
}
|
|
else
|
|
new_number (0);
|
|
}
|
|
break;
|
|
|
|
case LENGTH:
|
|
{
|
|
lang_memory_region_type *mem;
|
|
|
|
mem = lang_memory_region_lookup (tree->name.name, FALSE);
|
|
if (mem != NULL)
|
|
new_number (mem->length);
|
|
else
|
|
einfo (_("%F%S: undefined MEMORY region `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
}
|
|
break;
|
|
|
|
case ORIGIN:
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
lang_memory_region_type *mem;
|
|
|
|
mem = lang_memory_region_lookup (tree->name.name, FALSE);
|
|
if (mem != NULL)
|
|
new_rel_from_abs (mem->origin);
|
|
else
|
|
einfo (_("%F%S: undefined MEMORY region `%s'"
|
|
" referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
}
|
|
break;
|
|
|
|
case CONSTANT:
|
|
if (strcmp (tree->name.name, "MAXPAGESIZE") == 0)
|
|
new_number (config.maxpagesize);
|
|
else if (strcmp (tree->name.name, "COMMONPAGESIZE") == 0)
|
|
new_number (config.commonpagesize);
|
|
else
|
|
einfo (_("%F%S: unknown constant `%s' referenced in expression\n"),
|
|
tree, tree->name.name);
|
|
break;
|
|
|
|
default:
|
|
FAIL ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
exp_fold_tree_1 (etree_type *tree)
|
|
{
|
|
if (tree == NULL)
|
|
{
|
|
memset (&expld.result, 0, sizeof (expld.result));
|
|
return;
|
|
}
|
|
|
|
switch (tree->type.node_class)
|
|
{
|
|
case etree_value:
|
|
if (expld.section == bfd_abs_section_ptr
|
|
&& !config.sane_expr)
|
|
new_abs (tree->value.value);
|
|
else
|
|
new_number (tree->value.value);
|
|
expld.result.str = tree->value.str;
|
|
break;
|
|
|
|
case etree_rel:
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
asection *output_section = tree->rel.section->output_section;
|
|
new_rel (tree->rel.value + tree->rel.section->output_offset,
|
|
output_section);
|
|
}
|
|
else
|
|
memset (&expld.result, 0, sizeof (expld.result));
|
|
break;
|
|
|
|
case etree_assert:
|
|
exp_fold_tree_1 (tree->assert_s.child);
|
|
if (expld.phase == lang_final_phase_enum && !expld.result.value)
|
|
einfo ("%X%P: %s\n", tree->assert_s.message);
|
|
break;
|
|
|
|
case etree_unary:
|
|
fold_unary (tree);
|
|
break;
|
|
|
|
case etree_binary:
|
|
fold_binary (tree);
|
|
break;
|
|
|
|
case etree_trinary:
|
|
fold_trinary (tree);
|
|
break;
|
|
|
|
case etree_assign:
|
|
case etree_provide:
|
|
case etree_provided:
|
|
if (tree->assign.dst[0] == '.' && tree->assign.dst[1] == 0)
|
|
{
|
|
if (tree->type.node_class != etree_assign)
|
|
einfo (_("%F%S can not PROVIDE assignment to"
|
|
" location counter\n"), tree);
|
|
if (expld.phase != lang_first_phase_enum)
|
|
{
|
|
/* Notify the folder that this is an assignment to dot. */
|
|
expld.assigning_to_dot = TRUE;
|
|
exp_fold_tree_1 (tree->assign.src);
|
|
expld.assigning_to_dot = FALSE;
|
|
|
|
if (!expld.result.valid_p)
|
|
{
|
|
if (expld.phase != lang_mark_phase_enum)
|
|
einfo (_("%F%S invalid assignment to"
|
|
" location counter\n"), tree);
|
|
}
|
|
else if (expld.dotp == NULL)
|
|
einfo (_("%F%S assignment to location counter"
|
|
" invalid outside of SECTIONS\n"), tree);
|
|
|
|
/* After allocation, assignment to dot should not be
|
|
done inside an output section since allocation adds a
|
|
padding statement that effectively duplicates the
|
|
assignment. */
|
|
else if (expld.phase <= lang_allocating_phase_enum
|
|
|| expld.section == bfd_abs_section_ptr)
|
|
{
|
|
bfd_vma nextdot;
|
|
|
|
nextdot = expld.result.value;
|
|
if (expld.result.section != NULL)
|
|
nextdot += expld.result.section->vma;
|
|
else
|
|
nextdot += expld.section->vma;
|
|
if (nextdot < expld.dot
|
|
&& expld.section != bfd_abs_section_ptr)
|
|
einfo (_("%F%S cannot move location counter backwards"
|
|
" (from %V to %V)\n"),
|
|
tree, expld.dot, nextdot);
|
|
else
|
|
{
|
|
expld.dot = nextdot;
|
|
*expld.dotp = nextdot;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
memset (&expld.result, 0, sizeof (expld.result));
|
|
}
|
|
else
|
|
{
|
|
struct bfd_link_hash_entry *h = NULL;
|
|
|
|
if (tree->type.node_class == etree_provide)
|
|
{
|
|
h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
|
|
FALSE, FALSE, TRUE);
|
|
if (h == NULL
|
|
|| (h->type != bfd_link_hash_new
|
|
&& h->type != bfd_link_hash_undefined
|
|
&& h->type != bfd_link_hash_common))
|
|
{
|
|
/* Do nothing. The symbol was never referenced, or was
|
|
defined by some object. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
expld.assign_name = tree->assign.dst;
|
|
exp_fold_tree_1 (tree->assign.src);
|
|
/* expld.assign_name remaining equal to tree->assign.dst
|
|
below indicates the evaluation of tree->assign.src did
|
|
not use the value of tree->assign.dst. We don't allow
|
|
self assignment until the final phase for two reasons:
|
|
1) Expressions are evaluated multiple times. With
|
|
relaxation, the number of times may vary.
|
|
2) Section relative symbol values cannot be correctly
|
|
converted to absolute values, as is required by many
|
|
expressions, until final section sizing is complete. */
|
|
if ((expld.result.valid_p
|
|
&& (expld.phase == lang_final_phase_enum
|
|
|| expld.assign_name != NULL))
|
|
|| (expld.phase <= lang_mark_phase_enum
|
|
&& tree->type.node_class == etree_assign
|
|
&& tree->assign.defsym))
|
|
{
|
|
if (h == NULL)
|
|
{
|
|
h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
|
|
TRUE, FALSE, TRUE);
|
|
if (h == NULL)
|
|
einfo (_("%P%F:%s: hash creation failed\n"),
|
|
tree->assign.dst);
|
|
}
|
|
|
|
/* FIXME: Should we worry if the symbol is already
|
|
defined? */
|
|
lang_update_definedness (tree->assign.dst, h);
|
|
h->type = bfd_link_hash_defined;
|
|
h->u.def.value = expld.result.value;
|
|
if (expld.result.section == NULL)
|
|
expld.result.section = expld.section;
|
|
h->u.def.section = expld.result.section;
|
|
if (tree->type.node_class == etree_provide)
|
|
tree->type.node_class = etree_provided;
|
|
|
|
/* Copy the symbol type if this is a simple assignment of
|
|
one symbol to another. This could be more general
|
|
(e.g. a ?: operator with NAMEs in each branch). */
|
|
if (tree->assign.src->type.node_class == etree_name)
|
|
{
|
|
struct bfd_link_hash_entry *hsrc;
|
|
|
|
hsrc = bfd_link_hash_lookup (link_info.hash,
|
|
tree->assign.src->name.name,
|
|
FALSE, FALSE, TRUE);
|
|
if (hsrc)
|
|
bfd_copy_link_hash_symbol_type (link_info.output_bfd, h,
|
|
hsrc);
|
|
}
|
|
}
|
|
else if (expld.phase == lang_final_phase_enum)
|
|
{
|
|
h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
|
|
FALSE, FALSE, TRUE);
|
|
if (h != NULL
|
|
&& h->type == bfd_link_hash_new)
|
|
h->type = bfd_link_hash_undefined;
|
|
}
|
|
expld.assign_name = NULL;
|
|
}
|
|
break;
|
|
|
|
case etree_name:
|
|
fold_name (tree);
|
|
break;
|
|
|
|
default:
|
|
FAIL ();
|
|
memset (&expld.result, 0, sizeof (expld.result));
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
exp_fold_tree (etree_type *tree, asection *current_section, bfd_vma *dotp)
|
|
{
|
|
expld.dot = *dotp;
|
|
expld.dotp = dotp;
|
|
expld.section = current_section;
|
|
exp_fold_tree_1 (tree);
|
|
}
|
|
|
|
void
|
|
exp_fold_tree_no_dot (etree_type *tree)
|
|
{
|
|
expld.dot = 0;
|
|
expld.dotp = NULL;
|
|
expld.section = bfd_abs_section_ptr;
|
|
exp_fold_tree_1 (tree);
|
|
}
|
|
|
|
etree_type *
|
|
exp_binop (int code, etree_type *lhs, etree_type *rhs)
|
|
{
|
|
etree_type value, *new_e;
|
|
|
|
value.type.node_code = code;
|
|
value.type.filename = lhs->type.filename;
|
|
value.type.lineno = lhs->type.lineno;
|
|
value.binary.lhs = lhs;
|
|
value.binary.rhs = rhs;
|
|
value.type.node_class = etree_binary;
|
|
exp_fold_tree_no_dot (&value);
|
|
if (expld.result.valid_p)
|
|
return exp_intop (expld.result.value);
|
|
|
|
new_e = (etree_type *) stat_alloc (sizeof (new_e->binary));
|
|
memcpy (new_e, &value, sizeof (new_e->binary));
|
|
return new_e;
|
|
}
|
|
|
|
etree_type *
|
|
exp_trinop (int code, etree_type *cond, etree_type *lhs, etree_type *rhs)
|
|
{
|
|
etree_type value, *new_e;
|
|
|
|
value.type.node_code = code;
|
|
value.type.filename = cond->type.filename;
|
|
value.type.lineno = cond->type.lineno;
|
|
value.trinary.lhs = lhs;
|
|
value.trinary.cond = cond;
|
|
value.trinary.rhs = rhs;
|
|
value.type.node_class = etree_trinary;
|
|
exp_fold_tree_no_dot (&value);
|
|
if (expld.result.valid_p)
|
|
return exp_intop (expld.result.value);
|
|
|
|
new_e = (etree_type *) stat_alloc (sizeof (new_e->trinary));
|
|
memcpy (new_e, &value, sizeof (new_e->trinary));
|
|
return new_e;
|
|
}
|
|
|
|
etree_type *
|
|
exp_unop (int code, etree_type *child)
|
|
{
|
|
etree_type value, *new_e;
|
|
|
|
value.unary.type.node_code = code;
|
|
value.unary.type.filename = child->type.filename;
|
|
value.unary.type.lineno = child->type.lineno;
|
|
value.unary.child = child;
|
|
value.unary.type.node_class = etree_unary;
|
|
exp_fold_tree_no_dot (&value);
|
|
if (expld.result.valid_p)
|
|
return exp_intop (expld.result.value);
|
|
|
|
new_e = (etree_type *) stat_alloc (sizeof (new_e->unary));
|
|
memcpy (new_e, &value, sizeof (new_e->unary));
|
|
return new_e;
|
|
}
|
|
|
|
etree_type *
|
|
exp_nameop (int code, const char *name)
|
|
{
|
|
etree_type value, *new_e;
|
|
|
|
value.name.type.node_code = code;
|
|
value.name.type.filename = ldlex_filename ();
|
|
value.name.type.lineno = lineno;
|
|
value.name.name = name;
|
|
value.name.type.node_class = etree_name;
|
|
|
|
exp_fold_tree_no_dot (&value);
|
|
if (expld.result.valid_p)
|
|
return exp_intop (expld.result.value);
|
|
|
|
new_e = (etree_type *) stat_alloc (sizeof (new_e->name));
|
|
memcpy (new_e, &value, sizeof (new_e->name));
|
|
return new_e;
|
|
|
|
}
|
|
|
|
static etree_type *
|
|
exp_assop (const char *dst,
|
|
etree_type *src,
|
|
enum node_tree_enum class,
|
|
bfd_boolean defsym,
|
|
bfd_boolean hidden)
|
|
{
|
|
etree_type *n;
|
|
|
|
n = (etree_type *) stat_alloc (sizeof (n->assign));
|
|
n->assign.type.node_code = '=';
|
|
n->assign.type.filename = src->type.filename;
|
|
n->assign.type.lineno = src->type.lineno;
|
|
n->assign.type.node_class = class;
|
|
n->assign.src = src;
|
|
n->assign.dst = dst;
|
|
n->assign.defsym = defsym;
|
|
n->assign.hidden = hidden;
|
|
return n;
|
|
}
|
|
|
|
/* Handle linker script assignments and HIDDEN. */
|
|
|
|
etree_type *
|
|
exp_assign (const char *dst, etree_type *src, bfd_boolean hidden)
|
|
{
|
|
return exp_assop (dst, src, etree_assign, FALSE, hidden);
|
|
}
|
|
|
|
/* Handle --defsym command-line option. */
|
|
|
|
etree_type *
|
|
exp_defsym (const char *dst, etree_type *src)
|
|
{
|
|
return exp_assop (dst, src, etree_assign, TRUE, FALSE);
|
|
}
|
|
|
|
/* Handle PROVIDE. */
|
|
|
|
etree_type *
|
|
exp_provide (const char *dst, etree_type *src, bfd_boolean hidden)
|
|
{
|
|
return exp_assop (dst, src, etree_provide, FALSE, hidden);
|
|
}
|
|
|
|
/* Handle ASSERT. */
|
|
|
|
etree_type *
|
|
exp_assert (etree_type *exp, const char *message)
|
|
{
|
|
etree_type *n;
|
|
|
|
n = (etree_type *) stat_alloc (sizeof (n->assert_s));
|
|
n->assert_s.type.node_code = '!';
|
|
n->assert_s.type.filename = exp->type.filename;
|
|
n->assert_s.type.lineno = exp->type.lineno;
|
|
n->assert_s.type.node_class = etree_assert;
|
|
n->assert_s.child = exp;
|
|
n->assert_s.message = message;
|
|
return n;
|
|
}
|
|
|
|
void
|
|
exp_print_tree (etree_type *tree)
|
|
{
|
|
bfd_boolean function_like;
|
|
|
|
if (config.map_file == NULL)
|
|
config.map_file = stderr;
|
|
|
|
if (tree == NULL)
|
|
{
|
|
minfo ("NULL TREE\n");
|
|
return;
|
|
}
|
|
|
|
switch (tree->type.node_class)
|
|
{
|
|
case etree_value:
|
|
minfo ("0x%v", tree->value.value);
|
|
return;
|
|
case etree_rel:
|
|
if (tree->rel.section->owner != NULL)
|
|
minfo ("%B:", tree->rel.section->owner);
|
|
minfo ("%s+0x%v", tree->rel.section->name, tree->rel.value);
|
|
return;
|
|
case etree_assign:
|
|
fputs (tree->assign.dst, config.map_file);
|
|
exp_print_token (tree->type.node_code, TRUE);
|
|
exp_print_tree (tree->assign.src);
|
|
break;
|
|
case etree_provide:
|
|
case etree_provided:
|
|
fprintf (config.map_file, "PROVIDE (%s, ", tree->assign.dst);
|
|
exp_print_tree (tree->assign.src);
|
|
fputc (')', config.map_file);
|
|
break;
|
|
case etree_binary:
|
|
function_like = FALSE;
|
|
switch (tree->type.node_code)
|
|
{
|
|
case MAX_K:
|
|
case MIN_K:
|
|
case ALIGN_K:
|
|
case DATA_SEGMENT_ALIGN:
|
|
case DATA_SEGMENT_RELRO_END:
|
|
function_like = TRUE;
|
|
break;
|
|
case SEGMENT_START:
|
|
/* Special handling because arguments are in reverse order and
|
|
the segment name is quoted. */
|
|
exp_print_token (tree->type.node_code, FALSE);
|
|
fputs (" (\"", config.map_file);
|
|
exp_print_tree (tree->binary.rhs);
|
|
fputs ("\", ", config.map_file);
|
|
exp_print_tree (tree->binary.lhs);
|
|
fputc (')', config.map_file);
|
|
return;
|
|
}
|
|
if (function_like)
|
|
{
|
|
exp_print_token (tree->type.node_code, FALSE);
|
|
fputc (' ', config.map_file);
|
|
}
|
|
fputc ('(', config.map_file);
|
|
exp_print_tree (tree->binary.lhs);
|
|
if (function_like)
|
|
fprintf (config.map_file, ", ");
|
|
else
|
|
exp_print_token (tree->type.node_code, TRUE);
|
|
exp_print_tree (tree->binary.rhs);
|
|
fputc (')', config.map_file);
|
|
break;
|
|
case etree_trinary:
|
|
exp_print_tree (tree->trinary.cond);
|
|
fputc ('?', config.map_file);
|
|
exp_print_tree (tree->trinary.lhs);
|
|
fputc (':', config.map_file);
|
|
exp_print_tree (tree->trinary.rhs);
|
|
break;
|
|
case etree_unary:
|
|
exp_print_token (tree->unary.type.node_code, FALSE);
|
|
if (tree->unary.child)
|
|
{
|
|
fprintf (config.map_file, " (");
|
|
exp_print_tree (tree->unary.child);
|
|
fputc (')', config.map_file);
|
|
}
|
|
break;
|
|
|
|
case etree_assert:
|
|
fprintf (config.map_file, "ASSERT (");
|
|
exp_print_tree (tree->assert_s.child);
|
|
fprintf (config.map_file, ", %s)", tree->assert_s.message);
|
|
break;
|
|
|
|
case etree_name:
|
|
if (tree->type.node_code == NAME)
|
|
fputs (tree->name.name, config.map_file);
|
|
else
|
|
{
|
|
exp_print_token (tree->type.node_code, FALSE);
|
|
if (tree->name.name)
|
|
fprintf (config.map_file, " (%s)", tree->name.name);
|
|
}
|
|
break;
|
|
default:
|
|
FAIL ();
|
|
break;
|
|
}
|
|
}
|
|
|
|
bfd_vma
|
|
exp_get_vma (etree_type *tree, bfd_vma def, char *name)
|
|
{
|
|
if (tree != NULL)
|
|
{
|
|
exp_fold_tree_no_dot (tree);
|
|
if (expld.result.valid_p)
|
|
return expld.result.value;
|
|
else if (name != NULL && expld.phase != lang_mark_phase_enum)
|
|
einfo (_("%F%S: nonconstant expression for %s\n"),
|
|
tree, name);
|
|
}
|
|
return def;
|
|
}
|
|
|
|
int
|
|
exp_get_value_int (etree_type *tree, int def, char *name)
|
|
{
|
|
return exp_get_vma (tree, def, name);
|
|
}
|
|
|
|
fill_type *
|
|
exp_get_fill (etree_type *tree, fill_type *def, char *name)
|
|
{
|
|
fill_type *fill;
|
|
size_t len;
|
|
unsigned int val;
|
|
|
|
if (tree == NULL)
|
|
return def;
|
|
|
|
exp_fold_tree_no_dot (tree);
|
|
if (!expld.result.valid_p)
|
|
{
|
|
if (name != NULL && expld.phase != lang_mark_phase_enum)
|
|
einfo (_("%F%S: nonconstant expression for %s\n"),
|
|
tree, name);
|
|
return def;
|
|
}
|
|
|
|
if (expld.result.str != NULL && (len = strlen (expld.result.str)) != 0)
|
|
{
|
|
unsigned char *dst;
|
|
unsigned char *s;
|
|
fill = (fill_type *) xmalloc ((len + 1) / 2 + sizeof (*fill) - 1);
|
|
fill->size = (len + 1) / 2;
|
|
dst = fill->data;
|
|
s = (unsigned char *) expld.result.str;
|
|
val = 0;
|
|
do
|
|
{
|
|
unsigned int digit;
|
|
|
|
digit = *s++ - '0';
|
|
if (digit > 9)
|
|
digit = (digit - 'A' + '0' + 10) & 0xf;
|
|
val <<= 4;
|
|
val += digit;
|
|
--len;
|
|
if ((len & 1) == 0)
|
|
{
|
|
*dst++ = val;
|
|
val = 0;
|
|
}
|
|
}
|
|
while (len != 0);
|
|
}
|
|
else
|
|
{
|
|
fill = (fill_type *) xmalloc (4 + sizeof (*fill) - 1);
|
|
val = expld.result.value;
|
|
fill->data[0] = (val >> 24) & 0xff;
|
|
fill->data[1] = (val >> 16) & 0xff;
|
|
fill->data[2] = (val >> 8) & 0xff;
|
|
fill->data[3] = (val >> 0) & 0xff;
|
|
fill->size = 4;
|
|
}
|
|
return fill;
|
|
}
|
|
|
|
bfd_vma
|
|
exp_get_abs_int (etree_type *tree, int def, char *name)
|
|
{
|
|
if (tree != NULL)
|
|
{
|
|
exp_fold_tree_no_dot (tree);
|
|
|
|
if (expld.result.valid_p)
|
|
{
|
|
if (expld.result.section != NULL)
|
|
expld.result.value += expld.result.section->vma;
|
|
return expld.result.value;
|
|
}
|
|
else if (name != NULL && expld.phase != lang_mark_phase_enum)
|
|
{
|
|
einfo (_("%F%S: nonconstant expression for %s\n"),
|
|
tree, name);
|
|
}
|
|
}
|
|
return def;
|
|
}
|
|
|
|
static bfd_vma
|
|
align_n (bfd_vma value, bfd_vma align)
|
|
{
|
|
if (align <= 1)
|
|
return value;
|
|
|
|
value = (value + align - 1) / align;
|
|
return value * align;
|
|
}
|