468 lines
14 KiB
Plaintext
468 lines
14 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# It does some substitutions.
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cat >e${EMULATION_NAME}.c <<EOF
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/* This file is is generated by a shell script. DO NOT EDIT! */
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/* 32 bit ELF emulation code for ${EMULATION_NAME}
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Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
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Written by Steve Chamberlain <sac@cygnus.com>
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ELF support by Ian Lance Taylor <ian@cygnus.com>
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This file is part of GLD, the Gnu Linker.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define TARGET_IS_${EMULATION_NAME}
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#include "bfd.h"
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#include "sysdep.h"
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#include <ctype.h>
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#include "bfdlink.h"
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#include "ld.h"
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#include "config.h"
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#include "ldmain.h"
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#include "ldemul.h"
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#include "ldfile.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldlang.h"
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#include "ldgram.h"
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static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
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static boolean gld${EMULATION_NAME}_open_dynamic_archive
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PARAMS ((const char *, lang_input_statement_type *));
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static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
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static void gld${EMULATION_NAME}_find_statement_assignment
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PARAMS ((lang_statement_union_type *));
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static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
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static boolean gld${EMULATION_NAME}_place_orphan
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PARAMS ((lang_input_statement_type *, asection *));
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static void gld${EMULATION_NAME}_place_section
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PARAMS ((lang_statement_union_type *));
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static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
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static void
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gld${EMULATION_NAME}_before_parse()
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{
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ldfile_output_architecture = bfd_arch_${ARCH};
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config.dynamic_link = ${DYNAMIC_LINK-true};
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}
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/* Try to open a dynamic archive. This is where we know that ELF
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dynamic libraries have an extension of .so. */
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static boolean
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gld${EMULATION_NAME}_open_dynamic_archive (arch, entry)
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const char *arch;
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lang_input_statement_type *entry;
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{
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const char *filename;
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filename = entry->filename;
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if (! ldfile_open_file_search (arch, entry, "lib", ".so"))
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return false;
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/* We have found a dynamic object to include in the link. The ELF
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backend linker will create a DT_NEEDED entry in the .dynamic
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section naming this file. If this file includes a DT_SONAME
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entry, it will be used. Otherwise, the ELF linker will just use
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the name of the file. For an archive found by searching, like
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this one, the DT_NEEDED entry should consist of just the name of
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the file, without the path information used to find it. Note
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that we only need to do this if we have a dynamic object; an
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archive will never be referenced by a DT_NEEDED entry.
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FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
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very pretty. I haven't been able to think of anything that is
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pretty, though. */
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if (bfd_check_format (entry->the_bfd, bfd_object)
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&& (entry->the_bfd->flags & DYNAMIC) != 0)
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{
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char *needed_name;
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ASSERT (entry->is_archive && entry->search_dirs_flag);
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needed_name = (char *) xmalloc (strlen (filename)
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+ strlen (arch)
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+ sizeof "lib.so");
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sprintf (needed_name, "lib%s%s.so", filename, arch);
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bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
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}
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return true;
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}
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/* This is called after the sections have been attached to output
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sections, but before any sizes or addresses have been set. */
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static void
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gld${EMULATION_NAME}_before_allocation ()
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{
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asection *sinterp;
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/* If we are going to make any variable assignments, we need to let
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the ELF backend know about them in case the variables are
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referred to by dynamic objects. */
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lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
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/* Let the ELF backend work out the sizes of any sections required
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by dynamic linking. */
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if (! bfd_elf32_size_dynamic_sections (output_bfd,
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command_line.soname,
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command_line.rpath,
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command_line.export_dynamic,
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&link_info,
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&sinterp))
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einfo ("%P%F: failed to set dynamic section sizes: %E\n");
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/* Let the user override the dynamic linker we are using. */
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if (command_line.interpreter != NULL
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&& sinterp != NULL)
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{
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sinterp->contents = (bfd_byte *) command_line.interpreter;
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sinterp->_raw_size = strlen (command_line.interpreter) + 1;
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}
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/* Look for any sections named .gnu.warning. As a GNU extensions,
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we treat such sections as containing warning messages. We print
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out the warning message, and then zero out the section size so
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that it does not get copied into the output file. */
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{
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LANG_FOR_EACH_INPUT_STATEMENT (is)
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{
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asection *s;
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bfd_size_type sz;
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char *msg;
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boolean ret;
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if (is->just_syms_flag)
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continue;
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s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
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if (s == NULL)
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continue;
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sz = bfd_section_size (is->the_bfd, s);
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msg = xmalloc ((size_t) sz + 1);
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if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
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einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
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is->the_bfd);
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msg[sz] = '\0';
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ret = link_info.callbacks->warning (&link_info, msg);
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ASSERT (ret);
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free (msg);
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/* Clobber the section size, so that we don't waste copying the
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warning into the output file. */
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s->_raw_size = 0;
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}
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}
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}
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/* This is called by the before_allocation routine via
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lang_for_each_statement. It locates any assignment statements, and
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tells the ELF backend about them, in case they are assignments to
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symbols which are referred to by dynamic objects. */
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static void
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gld${EMULATION_NAME}_find_statement_assignment (s)
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lang_statement_union_type *s;
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{
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if (s->header.type == lang_assignment_statement_enum)
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gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
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}
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/* Look through an expression for an assignment statement. */
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static void
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gld${EMULATION_NAME}_find_exp_assignment (exp)
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etree_type *exp;
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{
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switch (exp->type.node_class)
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{
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case etree_assign:
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if (strcmp (exp->assign.dst, ".") != 0)
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{
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if (! bfd_elf32_record_link_assignment (output_bfd, &link_info,
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exp->assign.dst))
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einfo ("%P%F: failed to record assignment to %s: %E\n",
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exp->assign.dst);
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}
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gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
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break;
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case etree_binary:
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gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
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gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
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break;
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case etree_trinary:
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gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
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gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
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gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
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break;
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case etree_unary:
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gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
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break;
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default:
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break;
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}
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}
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/* Place an orphan section. We use this to put random SHF_ALLOC
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sections in the right segment. */
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static asection *hold_section;
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static lang_output_section_statement_type *hold_use;
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static lang_output_section_statement_type *hold_text;
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static lang_output_section_statement_type *hold_data;
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static lang_output_section_statement_type *hold_bss;
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/*ARGSUSED*/
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static boolean
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gld${EMULATION_NAME}_place_orphan (file, s)
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lang_input_statement_type *file;
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asection *s;
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{
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lang_output_section_statement_type *place;
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asection *snew, **pps;
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lang_statement_list_type *old;
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lang_statement_list_type add;
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etree_type *address;
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const char *secname, *ps;
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lang_output_section_statement_type *os;
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if ((s->flags & SEC_ALLOC) == 0)
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return false;
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/* Look through the script to see where to place this section. */
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hold_section = s;
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hold_use = NULL;
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lang_for_each_statement (gld${EMULATION_NAME}_place_section);
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if (hold_use != NULL)
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{
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/* We have already placed a section with this name. */
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wild_doit (&hold_use->children, s, hold_use, file);
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return true;
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}
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/* Decide which segment the section should go in based on the
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section flags. */
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place = NULL;
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if ((s->flags & SEC_HAS_CONTENTS) == 0
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&& hold_bss != NULL)
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place = hold_bss;
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else if ((s->flags & SEC_READONLY) == 0
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&& hold_data != NULL)
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place = hold_data;
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else if ((s->flags & SEC_READONLY) != 0
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&& hold_text != NULL)
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place = hold_text;
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if (place == NULL)
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return false;
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secname = bfd_get_section_name (s->owner, s);
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/* When generating an object which is to be dynamically linked, we
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do not support orphaned reloc sections. This is because all the
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reloc sections must be contiguous in order to generate correct
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DT_REL entries. When this case arises, you can just add the
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appropriate reloc sections to the linker script. Note that the
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.rel.plt section must always be the last reloc section. FIXME:
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This should simply be handled correctly here. */
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ASSERT (strncmp (secname, ".rel", 4) != 0
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|| bfd_get_section_by_name (output_bfd, ".dynamic") == NULL);
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/* Create the section in the output file, and put it in the right
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place. This shuffling to make the output file look neater, and
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also means that the BFD backend does not have to sort the
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sections in order by address. */
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snew = bfd_make_section (output_bfd, secname);
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if (snew == NULL)
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einfo ("%P%F: output format %s cannot represent section called %s\n",
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output_bfd->xvec->name, secname);
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for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
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;
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*pps = snew->next;
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snew->next = place->bfd_section->next;
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place->bfd_section->next = snew;
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/* Start building a list of statements for this section. */
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old = stat_ptr;
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stat_ptr = &add;
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lang_list_init (stat_ptr);
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/* If the name of the section is representable in C, then create
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symbols to mark the start and the end of the section. */
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for (ps = secname; *ps != '\0'; ps++)
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if (! isalnum (*ps) && *ps != '_')
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break;
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if (*ps == '\0' && config.build_constructors)
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{
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char *symname;
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symname = (char *) xmalloc (ps - secname + sizeof "__start_");
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sprintf (symname, "__start_%s", secname);
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lang_add_assignment (exp_assop ('=', symname,
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exp_nameop (NAME, ".")));
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}
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if (! link_info.relocateable)
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address = NULL;
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else
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address = exp_intop ((bfd_vma) 0);
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lang_enter_output_section_statement (secname, address, 0,
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(bfd_vma) 0,
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(etree_type *) NULL,
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(etree_type *) NULL,
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(etree_type *) NULL);
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os = lang_output_section_statement_lookup (secname);
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wild_doit (&os->children, s, os, file);
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lang_leave_output_section_statement ((bfd_vma) 0, "*default*");
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stat_ptr = &add;
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if (*ps == '\0' && config.build_constructors)
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{
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char *symname;
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symname = (char *) xmalloc (ps - secname + sizeof "__stop_");
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sprintf (symname, "__stop_%s", secname);
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lang_add_assignment (exp_assop ('=', symname,
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exp_nameop (NAME, ".")));
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}
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/* Now stick the new statement list right after PLACE. */
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*add.tail = place->header.next;
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place->header.next = add.head;
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stat_ptr = old;
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return true;
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}
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static void
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gld${EMULATION_NAME}_place_section (s)
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lang_statement_union_type *s;
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{
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lang_output_section_statement_type *os;
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if (s->header.type != lang_output_section_statement_enum)
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return;
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os = &s->output_section_statement;
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if (strcmp (os->name, hold_section->name) == 0)
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hold_use = os;
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if (strcmp (os->name, ".text") == 0)
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hold_text = os;
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else if (strcmp (os->name, ".data") == 0)
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hold_data = os;
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else if (strcmp (os->name, ".bss") == 0)
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hold_bss = os;
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}
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static char *
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gld${EMULATION_NAME}_get_script(isfile)
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int *isfile;
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EOF
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if test -n "$COMPILE_IN"
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then
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# Scripts compiled in.
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# sed commands to quote an ld script as a C string.
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sc='s/["\\]/\\&/g
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s/$/\\n\\/
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1s/^/"/
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$s/$/n"/
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'
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cat >>e${EMULATION_NAME}.c <<EOF
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{
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*isfile = 0;
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if (link_info.relocateable == true && config.build_constructors == true)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
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else if (link_info.relocateable == true)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
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else if (!config.text_read_only)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
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else if (!config.magic_demand_paged)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
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else if (link_info.shared)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`;
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else
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return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
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}
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EOF
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else
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# Scripts read from the filesystem.
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cat >>e${EMULATION_NAME}.c <<EOF
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{
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*isfile = 1;
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if (link_info.relocateable == true && config.build_constructors == true)
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return "ldscripts/${EMULATION_NAME}.xu";
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else if (link_info.relocateable == true)
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return "ldscripts/${EMULATION_NAME}.xr";
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else if (!config.text_read_only)
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return "ldscripts/${EMULATION_NAME}.xbn";
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else if (!config.magic_demand_paged)
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return "ldscripts/${EMULATION_NAME}.xn";
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else if (link_info.shared)
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return "ldscripts/${EMULATION_NAME}.xs";
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else
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return "ldscripts/${EMULATION_NAME}.x";
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}
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EOF
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fi
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cat >>e${EMULATION_NAME}.c <<EOF
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struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
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{
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gld${EMULATION_NAME}_before_parse,
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syslib_default,
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hll_default,
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after_parse_default,
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after_open_default,
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after_allocation_default,
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set_output_arch_default,
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ldemul_default_target,
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gld${EMULATION_NAME}_before_allocation,
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gld${EMULATION_NAME}_get_script,
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"${EMULATION_NAME}",
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"${OUTPUT_FORMAT}",
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NULL,
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NULL,
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gld${EMULATION_NAME}_open_dynamic_archive,
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gld${EMULATION_NAME}_place_orphan
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};
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EOF
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