189 lines
6.0 KiB
Plaintext
189 lines
6.0 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright 2000, 2001, 2003 Free Software Foundation, Inc.
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# Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on armelf.em
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#
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# This file is part of GLD, the Gnu Linker.
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#
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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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#
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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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#
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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# This file is sourced from elf32.em, and defines some extra routines for m68k
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# embedded systems using ELF and for some other systems using m68k ELF. While
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# it is sourced from elf32.em for all m68k ELF configurations, here we include
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# only the features we want depending on the configuration.
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case ${target} in
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m68*-*-elf)
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echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c
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;;
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esac
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cat >>e${EMULATION_NAME}.c <<EOF
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#ifdef SUPPORT_EMBEDDED_RELOCS
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static void check_sections (bfd *, asection *, void *);
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#endif
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/* This function is run after all the input files have been opened. */
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static void
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m68k_elf_after_open (void)
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{
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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_after_open ();
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#ifdef SUPPORT_EMBEDDED_RELOCS
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if (command_line.embedded_relocs
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&& (! link_info.relocatable))
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{
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bfd *abfd;
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/* In the embedded relocs mode we create a .emreloc section for each
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input file with a nonzero .data section. The BFD backend will fill in
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these sections with magic numbers which can be used to relocate the
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data section at run time. */
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for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
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{
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asection *datasec;
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/* As first-order business, make sure that each input BFD is either
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COFF or ELF. We need to call a special BFD backend function to
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generate the embedded relocs, and we have such functions only for
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COFF and ELF. */
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if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
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&& bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n");
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datasec = bfd_get_section_by_name (abfd, ".data");
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/* Note that we assume that the reloc_count field has already
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been set up. We could call bfd_get_reloc_upper_bound, but
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that returns the size of a memory buffer rather than a reloc
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count. We do not want to call bfd_canonicalize_reloc,
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because although it would always work it would force us to
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read in the relocs into BFD canonical form, which would waste
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a significant amount of time and memory. */
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if (datasec != NULL && datasec->reloc_count > 0)
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{
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asection *relsec;
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relsec = bfd_make_section (abfd, ".emreloc");
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if (relsec == NULL
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|| ! bfd_set_section_flags (abfd, relsec,
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(SEC_ALLOC
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| SEC_LOAD
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| SEC_HAS_CONTENTS
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| SEC_IN_MEMORY))
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|| ! bfd_set_section_alignment (abfd, relsec, 2)
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|| ! bfd_set_section_size (abfd, relsec,
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datasec->reloc_count * 12))
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einfo ("%F%B: can not create .emreloc section: %E\n");
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}
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/* Double check that all other data sections are empty, as is
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required for embedded PIC code. */
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bfd_map_over_sections (abfd, check_sections, datasec);
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}
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}
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#endif /* SUPPORT_EMBEDDED_RELOCS */
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}
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#ifdef SUPPORT_EMBEDDED_RELOCS
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/* Check that of the data sections, only the .data section has
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relocs. This is called via bfd_map_over_sections. */
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static void
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check_sections (bfd *abfd, asection *sec, void *datasec)
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{
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if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
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&& sec != datasec
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&& sec->reloc_count != 0)
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einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
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abfd, bfd_get_section_name (abfd, sec));
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}
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#endif /* SUPPORT_EMBEDDED_RELOCS */
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/* This function is called after the section sizes and offsets have
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been set. */
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static void
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m68k_elf_after_allocation (void)
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{
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/* Call the standard elf routine. */
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after_allocation_default ();
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#ifdef SUPPORT_EMBEDDED_RELOCS
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if (command_line.embedded_relocs
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&& (! link_info.relocatable))
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{
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bfd *abfd;
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/* If we are generating embedded relocs, call a special BFD backend
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routine to do the work. */
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for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
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{
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asection *datasec, *relsec;
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char *errmsg;
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datasec = bfd_get_section_by_name (abfd, ".data");
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if (datasec == NULL || datasec->reloc_count == 0)
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continue;
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relsec = bfd_get_section_by_name (abfd, ".emreloc");
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ASSERT (relsec != NULL);
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if (bfd_get_flavour (abfd) == bfd_target_coff_flavour)
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{
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if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,
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datasec, relsec,
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&errmsg))
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{
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if (errmsg == NULL)
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einfo ("%B%X: can not create runtime reloc information: %E\n",
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abfd);
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else
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einfo ("%X%B: can not create runtime reloc information: %s\n",
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abfd, errmsg);
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}
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}
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else if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
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{
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if (! bfd_m68k_elf32_create_embedded_relocs (abfd, &link_info,
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datasec, relsec,
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&errmsg))
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{
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if (errmsg == NULL)
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einfo ("%B%X: can not create runtime reloc information: %E\n",
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abfd);
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else
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einfo ("%X%B: can not create runtime reloc information: %s\n",
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abfd, errmsg);
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}
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}
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else
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abort ();
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}
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}
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#endif /* SUPPORT_EMBEDDED_RELOCS */
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}
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EOF
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# We have our own after_open and after_allocation functions, but they call
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# the standard routines, so give them a different name.
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LDEMUL_AFTER_OPEN=m68k_elf_after_open
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LDEMUL_AFTER_ALLOCATION=m68k_elf_after_allocation
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