616 lines
18 KiB
C
616 lines
18 KiB
C
/* Renesas / SuperH specific support for Symbian 32-bit ELF files
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Copyright (C) 2004-2017 Free Software Foundation, Inc.
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Contributed by Red Hat
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This file is part of BFD, the Binary File Descriptor library.
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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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/* Stop elf32-sh.c from defining any target vectors. */
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#define SH_TARGET_ALREADY_DEFINED
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#define sh_find_elf_flags sh_symbian_find_elf_flags
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#define sh_elf_get_flags_from_mach sh_symbian_elf_get_flags_from_mach
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#include "elf32-sh.c"
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//#define SYMBIAN_DEBUG 1
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#define SYMBIAN_DEBUG 0
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#define DIRECTIVE_HEADER "#<SYMEDIT>#\n"
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#define DIRECTIVE_IMPORT "IMPORT "
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#define DIRECTIVE_EXPORT "EXPORT "
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#define DIRECTIVE_AS "AS "
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/* Macro to advance 's' until either it reaches 'e' or the
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character pointed to by 's' is equal to 'c'. If 'e' is
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reached and SYMBIAN_DEBUG is enabled then the error message 'm'
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is displayed. */
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#define SKIP_UNTIL(s,e,c,m) \
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do \
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{ \
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while (s < e && *s != c) \
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++ s; \
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if (s >= e) \
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{ \
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if (SYMBIAN_DEBUG) \
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fprintf (stderr, "Corrupt directive: %s\n", m); \
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result = FALSE; \
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} \
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} \
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while (0); \
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if (!result) \
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break;
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/* Like SKIP_UNTIL except there are two terminator characters
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c1 and c2. */
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#define SKIP_UNTIL2(s,e,c1,c2,m) \
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do \
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{ \
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while (s < e && *s != c1 && *s != c2) \
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++ s; \
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if (s >= e) \
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{ \
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if (SYMBIAN_DEBUG) \
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fprintf (stderr, "Corrupt directive: %s\n", m); \
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result = FALSE; \
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} \
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} \
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while (0); \
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if (!result) \
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break;
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/* Macro to advance 's' until either it reaches 'e' or the
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character pointed to by 's' is not equal to 'c'. If 'e'
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is reached and SYMBIAN_DEBUG is enabled then the error message
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'm' is displayed. */
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#define SKIP_WHILE(s,e,c,m) \
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do \
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{ \
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while (s < e && *s == c) \
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++ s; \
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if (s >= e) \
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{ \
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if (SYMBIAN_DEBUG) \
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fprintf (stderr, "Corrupt directive: %s\n", m); \
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result = FALSE; \
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} \
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} \
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while (0); \
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if (!result) \
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break;
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typedef struct symbol_rename
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{
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struct symbol_rename * next;
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char * current_name;
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char * new_name;
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struct elf_link_hash_entry * current_hash;
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unsigned long new_symndx;
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}
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symbol_rename;
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static symbol_rename * rename_list = NULL;
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/* Accumulate a list of symbols to be renamed. */
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static bfd_boolean
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sh_symbian_import_as (struct bfd_link_info *info, bfd * abfd,
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char * current_name, char * new_name)
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{
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struct elf_link_hash_entry * new_hash;
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symbol_rename * node;
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT '%s' AS '%s'\n", current_name, new_name);
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for (node = rename_list; node; node = node->next)
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if (strcmp (node->current_name, current_name) == 0)
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{
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if (strcmp (node->new_name, new_name) == 0)
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/* Already added to rename list. */
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return TRUE;
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bfd_set_error (bfd_error_invalid_operation);
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/* xgettext:c-format */
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_bfd_error_handler (_("%B: IMPORT AS directive for %s conceals previous IMPORT AS"),
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abfd, current_name);
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return FALSE;
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}
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if ((node = bfd_malloc (sizeof * node)) == NULL)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT AS: No mem for new rename node\n");
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return FALSE;
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}
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if ((node->current_name = bfd_malloc (strlen (current_name) + 1)) == NULL)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT AS: No mem for current name field in rename node\n");
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free (node);
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return FALSE;
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}
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else
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strcpy (node->current_name, current_name);
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if ((node->new_name = bfd_malloc (strlen (new_name) + 1)) == NULL)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT AS: No mem for new name field in rename node\n");
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free (node->current_name);
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free (node);
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return FALSE;
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}
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else
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strcpy (node->new_name, new_name);
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node->next = rename_list;
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node->current_hash = NULL;
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node->new_symndx = 0;
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rename_list = node;
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new_hash = elf_link_hash_lookup (elf_hash_table (info), node->new_name, TRUE, FALSE, TRUE);
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bfd_elf_link_record_dynamic_symbol (info, new_hash);
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if (new_hash->root.type == bfd_link_hash_new)
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new_hash->root.type = bfd_link_hash_undefined;
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return TRUE;
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}
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static bfd_boolean
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sh_symbian_import (bfd * abfd ATTRIBUTE_UNUSED, char * name)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT '%s'\n", name);
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/* XXX: Generate an import somehow ? */
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return TRUE;
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}
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static bfd_boolean
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sh_symbian_export (bfd * abfd ATTRIBUTE_UNUSED, char * name)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "EXPORT '%s'\n", name);
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/* XXX: Generate an export somehow ? */
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return TRUE;
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}
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/* Process any magic embedded commands in the .directive. section.
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Returns TRUE upon sucecss, but if it fails it sets bfd_error and
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returns FALSE. */
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static bfd_boolean
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sh_symbian_process_embedded_commands (struct bfd_link_info *info, bfd * abfd,
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asection * sec, bfd_byte * contents)
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{
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char *s;
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char *e;
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bfd_boolean result = TRUE;
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bfd_size_type sz = sec->rawsize ? sec->rawsize : sec->size;
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for (s = (char *) contents, e = s + sz; s < e;)
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{
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char * directive = s;
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switch (*s)
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{
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/* I want to use "case DIRECTIVE_HEADER [0]:" here but gcc won't let me :-( */
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case '#':
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if (strcmp (s, DIRECTIVE_HEADER))
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result = FALSE;
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else
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/* Just ignore the header.
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XXX: Strictly speaking we ought to check that the header
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is present and that it is the first thing in the file. */
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s += strlen (DIRECTIVE_HEADER) + 1;
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break;
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case 'I':
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if (! CONST_STRNEQ (s, DIRECTIVE_IMPORT))
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result = FALSE;
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else
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{
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char * new_name;
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char * new_name_end;
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char name_end_char;
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/* Skip the IMPORT directive. */
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s += strlen (DIRECTIVE_IMPORT);
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new_name = s;
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/* Find the end of the new name. */
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while (s < e && *s != ' ' && *s != '\n')
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++ s;
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if (s >= e)
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{
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/* We have reached the end of the .directive section
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without encountering a string terminator. This is
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allowed for IMPORT directives. */
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new_name_end = e - 1;
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name_end_char = * new_name_end;
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* new_name_end = 0;
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result = sh_symbian_import (abfd, new_name);
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* new_name_end = name_end_char;
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break;
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}
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/* Remember where the name ends. */
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new_name_end = s;
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/* Skip any whitespace before the 'AS'. */
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SKIP_WHILE (s, e, ' ', "IMPORT: Name just followed by spaces");
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/* Terminate the new name. (Do this after skiping...) */
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name_end_char = * new_name_end;
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* new_name_end = 0;
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/* Check to see if 'AS '... is present. If so we have an
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IMPORT AS directive, otherwise we have an IMPORT directive. */
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if (! CONST_STRNEQ (s, DIRECTIVE_AS))
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{
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/* Skip the new-line at the end of the name. */
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if (SYMBIAN_DEBUG && name_end_char != '\n')
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fprintf (stderr, "IMPORT: No newline at end of directive\n");
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else
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s ++;
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result = sh_symbian_import (abfd, new_name);
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/* Skip past the NUL character. */
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if (* s ++ != 0)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT: No NUL at end of directive\n");
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}
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}
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else
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{
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char * current_name;
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char * current_name_end;
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char current_name_end_char;
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/* Skip the 'AS '. */
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s += strlen (DIRECTIVE_AS);
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/* Skip any white space after the 'AS '. */
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SKIP_WHILE (s, e, ' ', "IMPORT AS: Nothing after AS");
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current_name = s;
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/* Find the end of the current name. */
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SKIP_UNTIL2 (s, e, ' ', '\n', "IMPORT AS: No newline at the end of the current name");
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/* Skip (backwards) over spaces at the end of the current name. */
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current_name_end = s;
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current_name_end_char = * current_name_end;
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SKIP_WHILE (s, e, ' ', "IMPORT AS: Current name just followed by spaces");
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/* Skip past the newline character. */
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if (* s ++ != '\n')
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT AS: No newline at end of directive\n");
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/* Terminate the current name after having performed the skips. */
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* current_name_end = 0;
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result = sh_symbian_import_as (info, abfd, current_name, new_name);
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/* The next character should be a NUL. */
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if (* s != 0)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT AS: Junk at end of directive\n");
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result = FALSE;
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}
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s ++;
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* current_name_end = current_name_end_char;
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}
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/* Restore the characters we overwrote, since
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the .directive section will be emitted. */
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* new_name_end = name_end_char;
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}
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break;
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case 'E':
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if (! CONST_STRNEQ (s, DIRECTIVE_EXPORT))
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result = FALSE;
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else
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{
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char * name;
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char * name_end;
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char name_end_char;
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/* Skip the directive. */
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s += strlen (DIRECTIVE_EXPORT);
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name = s;
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/* Find the end of the name to be exported. */
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SKIP_UNTIL (s, e, '\n', "EXPORT: no newline at end of directive");
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/* Skip (backwards) over spaces at end of exported name. */
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for (name_end = s; name_end[-1] == ' '; name_end --)
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;
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/* name_end now points at the first character after the
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end of the exported name, so we can termiante it */
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name_end_char = * name_end;
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* name_end = 0;
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/* Skip passed the newline character. */
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s ++;
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result = sh_symbian_export (abfd, name);
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/* The next character should be a NUL. */
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if (* s != 0)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "EXPORT: Junk at end of directive\n");
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result = FALSE;
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}
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s++;
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/* Restore the character we deleted. */
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* name_end = name_end_char;
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}
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break;
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default:
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result = FALSE;
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break;
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}
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if (! result)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "offset into .directive section: %ld\n",
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(long) (directive - (char *) contents));
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bfd_set_error (bfd_error_invalid_operation);
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/* xgettext:c-format */
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_bfd_error_handler (_("%B: Unrecognised .directive command: %s"),
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abfd, directive);
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break;
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}
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}
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return result;
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}
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/* Scan a bfd for a .directive section, and if found process it.
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Returns TRUE upon success, FALSE otherwise. */
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static bfd_boolean
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sh_symbian_process_directives (bfd *abfd, struct bfd_link_info *info)
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{
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bfd_boolean result = FALSE;
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bfd_byte * contents;
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asection * sec = bfd_get_section_by_name (abfd, ".directive");
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bfd_size_type sz;
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if (!sec)
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return TRUE;
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sz = sec->rawsize ? sec->rawsize : sec->size;
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contents = bfd_malloc (sz);
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if (!contents)
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bfd_set_error (bfd_error_no_memory);
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else
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{
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if (bfd_get_section_contents (abfd, sec, contents, 0, sz))
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result = sh_symbian_process_embedded_commands (info, abfd, sec, contents);
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free (contents);
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}
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return result;
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}
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/* Intercept the normal sh_relocate_section() function
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and magle the relocs to allow for symbol renaming. */
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static bfd_boolean
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sh_symbian_relocate_section (bfd * output_bfd,
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struct bfd_link_info * info,
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bfd * input_bfd,
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asection * input_section,
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bfd_byte * contents,
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Elf_Internal_Rela * relocs,
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Elf_Internal_Sym * local_syms,
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asection ** local_sections)
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{
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/* When performing a final link we implement the IMPORT AS directives. */
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if (!bfd_link_relocatable (info))
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{
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Elf_Internal_Rela * rel;
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Elf_Internal_Rela * relend;
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Elf_Internal_Shdr * symtab_hdr;
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struct elf_link_hash_entry ** sym_hashes;
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struct elf_link_hash_entry ** sym_hashes_end;
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struct elf_link_hash_table * hash_table;
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symbol_rename * ptr;
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bfd_size_type num_global_syms;
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unsigned long num_local_syms;
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BFD_ASSERT (! elf_bad_symtab (input_bfd));
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symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
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hash_table = elf_hash_table (info);
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num_local_syms = symtab_hdr->sh_info;
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num_global_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
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num_global_syms -= num_local_syms;
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sym_hashes = elf_sym_hashes (input_bfd);
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sym_hashes_end = sym_hashes + num_global_syms;
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/* First scan the rename table, caching the hash entry and the new index. */
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for (ptr = rename_list; ptr; ptr = ptr->next)
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{
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struct elf_link_hash_entry * new_hash;
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struct elf_link_hash_entry ** h;
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ptr->current_hash = elf_link_hash_lookup (hash_table, ptr->current_name, FALSE, FALSE, TRUE);
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if (ptr->current_hash == NULL)
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{
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "IMPORT AS: current symbol '%s' does not exist\n", ptr->current_name);
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continue;
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}
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new_hash = elf_link_hash_lookup (hash_table, ptr->new_name,
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FALSE, FALSE, TRUE);
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/* If we could not find the symbol then it is a new, undefined symbol.
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Symbian want this behaviour - ie they want to be able to rename the
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reference in a reloc from one undefined symbol to another, new and
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undefined symbol. So we create that symbol here. */
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if (new_hash == NULL)
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{
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struct bfd_link_hash_entry *bh = NULL;
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bfd_boolean collect = get_elf_backend_data (input_bfd)->collect;
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if (_bfd_generic_link_add_one_symbol (info, input_bfd,
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ptr->new_name, BSF_GLOBAL,
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bfd_und_section_ptr, 0,
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NULL, FALSE, collect,
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&bh))
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{
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new_hash = (struct elf_link_hash_entry *) bh;
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new_hash->type = STT_FUNC;
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new_hash->non_elf = 0;
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "Created new symbol %s\n", ptr->new_name);
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}
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}
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if (new_hash == NULL)
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{
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/* xgettext:c-format */
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_bfd_error_handler (_("%B: Failed to add renamed symbol %s"),
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input_bfd, ptr->new_name);
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continue;
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}
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/* Convert the new_hash value into a index into the table of symbol hashes. */
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for (h = sym_hashes; h < sym_hashes_end; h ++)
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{
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if (* h == new_hash)
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{
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ptr->new_symndx = h - sym_hashes + num_local_syms;
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if (SYMBIAN_DEBUG)
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fprintf (stderr, "Converted new hash to index of %ld\n", ptr->new_symndx);
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break;
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}
|
|
}
|
|
/* If the new symbol is not in the hash table then it must be
|
|
because it is one of the newly created undefined symbols
|
|
manufactured above. So we extend the sym has table here to
|
|
include this extra symbol. */
|
|
if (h == sym_hashes_end)
|
|
{
|
|
struct elf_link_hash_entry ** new_sym_hashes;
|
|
|
|
/* This is not very efficient, but it works. */
|
|
++ num_global_syms;
|
|
new_sym_hashes = bfd_alloc (input_bfd, num_global_syms * sizeof * sym_hashes);
|
|
if (new_sym_hashes == NULL)
|
|
{
|
|
if (SYMBIAN_DEBUG)
|
|
fprintf (stderr, "Out of memory extending hash table\n");
|
|
continue;
|
|
}
|
|
memcpy (new_sym_hashes, sym_hashes, (num_global_syms - 1) * sizeof * sym_hashes);
|
|
new_sym_hashes[num_global_syms - 1] = new_hash;
|
|
elf_sym_hashes (input_bfd) = sym_hashes = new_sym_hashes;
|
|
sym_hashes_end = sym_hashes + num_global_syms;
|
|
symtab_hdr->sh_size = (num_global_syms + num_local_syms) * sizeof (Elf32_External_Sym);
|
|
|
|
ptr->new_symndx = num_global_syms - 1 + num_local_syms;
|
|
|
|
if (SYMBIAN_DEBUG)
|
|
fprintf (stderr, "Extended symbol hash table to insert new symbol as index %ld\n",
|
|
ptr->new_symndx);
|
|
}
|
|
}
|
|
|
|
/* Walk the reloc list looking for references to renamed symbols.
|
|
When we find one, we alter the index in the reloc to point to the new symbol. */
|
|
for (rel = relocs, relend = relocs + input_section->reloc_count;
|
|
rel < relend;
|
|
rel ++)
|
|
{
|
|
int r_type;
|
|
unsigned long r_symndx;
|
|
struct elf_link_hash_entry * h;
|
|
|
|
r_symndx = ELF32_R_SYM (rel->r_info);
|
|
r_type = ELF32_R_TYPE (rel->r_info);
|
|
|
|
/* Ignore unused relocs. */
|
|
if ((r_type >= (int) R_SH_GNU_VTINHERIT
|
|
&& r_type <= (int) R_SH_LABEL)
|
|
|| r_type == (int) R_SH_NONE
|
|
|| r_type < 0
|
|
|| r_type >= R_SH_max)
|
|
continue;
|
|
|
|
/* Ignore relocs against local symbols. */
|
|
if (r_symndx < num_local_syms)
|
|
continue;
|
|
|
|
BFD_ASSERT (r_symndx < (num_global_syms + num_local_syms));
|
|
h = sym_hashes[r_symndx - num_local_syms];
|
|
BFD_ASSERT (h != NULL);
|
|
|
|
while ( h->root.type == bfd_link_hash_indirect
|
|
|| h->root.type == bfd_link_hash_warning)
|
|
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
|
|
|
/* If the symbol is defined there is no need to rename it.
|
|
XXX - is this true ? */
|
|
if ( h->root.type == bfd_link_hash_defined
|
|
|| h->root.type == bfd_link_hash_defweak
|
|
|| h->root.type == bfd_link_hash_undefweak)
|
|
continue;
|
|
|
|
for (ptr = rename_list; ptr; ptr = ptr->next)
|
|
if (h == ptr->current_hash)
|
|
{
|
|
BFD_ASSERT (ptr->new_symndx);
|
|
if (SYMBIAN_DEBUG)
|
|
fprintf (stderr, "convert reloc %lx from using index %ld to using index %ld\n",
|
|
(unsigned long) rel->r_info,
|
|
(long) ELF32_R_SYM (rel->r_info), ptr->new_symndx);
|
|
rel->r_info = ELF32_R_INFO (ptr->new_symndx, r_type);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return sh_elf_relocate_section (output_bfd, info, input_bfd, input_section,
|
|
contents, relocs, local_syms, local_sections);
|
|
}
|
|
|
|
#define TARGET_LITTLE_SYM sh_elf32_symbian_le_vec
|
|
#define TARGET_LITTLE_NAME "elf32-shl-symbian"
|
|
|
|
#undef elf_backend_relocate_section
|
|
#define elf_backend_relocate_section sh_symbian_relocate_section
|
|
#undef elf_backend_check_directives
|
|
#define elf_backend_check_directives sh_symbian_process_directives
|
|
|
|
#include "elf32-target.h"
|