184 lines
6.2 KiB
Plaintext
184 lines
6.2 KiB
Plaintext
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# Copyright 2002 Free Software Foundation, Inc.
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# Written by Mitch Lichtenberg <mpl@broadcom.com> and
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# Chris Demetriou <cgd@broadcom.com> based on m68kelf.em and mipsecoff.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 shell script emits a C file. -*- C -*-
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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 ${target} in
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mips*-*-elf)
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echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c
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;;
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esac
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cat >>e${EMULATION_NAME}.c <<EOF
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static void mips_elf${ELFSIZE}_after_open PARAMS ((void));
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#ifdef SUPPORT_EMBEDDED_RELOCS
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static void mips_elf${ELFSIZE}_check_sections PARAMS ((bfd *, asection *,
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PTR));
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#endif
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static void mips_elf${ELFSIZE}_after_allocation PARAMS ((void));
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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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mips_elf${ELFSIZE}_after_open()
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{
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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_after_open ();
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#ifdef SUPPORT_EMBEDDED_RELOCS
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if (command_line.embedded_relocs && (! link_info.relocateable))
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{
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bfd *abfd;
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/* In the embedded relocs mode we create a .rel.sdata section for
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each input file with a .sdata section which has has
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relocations. The BFD backend will fill in these sections
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with magic numbers which can be used to relocate the data
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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
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ELF. We need to call a special BFD backend function to
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generate the embedded relocs, and we have that function
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only for ELF */
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if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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einfo ("%F%B: all input objects must be ELF for --embedded-relocs\n");
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if (bfd_get_arch_size (abfd) != ${ELFSIZE})
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einfo ("%F%B: all input objects must be ${ELFSIZE}-bit ELF for --embedded-relocs\n");
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datasec = bfd_get_section_by_name (abfd, ".sdata");
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/* Note that we assume that the reloc_count field has already
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been set up. We could call bfd_get_reloc_upper_bound, but
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that returns the size of a memory buffer rather than a reloc
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count. We do not want to call bfd_canonicalize_reloc,
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because although it would always work it would force us to
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read in the relocs into BFD canonical form, which would waste
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a significant amount of time and memory. */
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if (datasec != NULL && datasec->reloc_count > 0)
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{
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asection *relsec;
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relsec = bfd_make_section (abfd, ".rel.sdata");
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if (relsec == NULL
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|| ! bfd_set_section_flags (abfd, relsec,
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(SEC_ALLOC
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| SEC_LOAD
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| SEC_HAS_CONTENTS
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| SEC_IN_MEMORY))
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|| ! bfd_set_section_alignment (abfd, relsec,
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(${ELFSIZE} == 32) ? 2 : 3)
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|| ! bfd_set_section_size (abfd, relsec,
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datasec->reloc_count
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* ((${ELFSIZE} / 8) + 8)))
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einfo ("%F%B: cannot create .rel.sdata section: %E\n");
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}
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/* Double check that all other data sections have no relocs,
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as is required for embedded PIC code. */
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bfd_map_over_sections (abfd, mips_elf${ELFSIZE}_check_sections,
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(PTR) 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 .sdata 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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mips_elf${ELFSIZE}_check_sections (abfd, sec, sdatasec)
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bfd *abfd;
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asection *sec;
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PTR sdatasec;
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{
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if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
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&& sec != (asection *) sdatasec
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&& sec->reloc_count != 0)
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einfo ("%F%X: section %s has relocs; cannot use --embedded-relocs\n",
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abfd, bfd_get_section_name (abfd, sec));
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}
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#endif /* SUPPORT_EMBEDDED_RELOCS */
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/* This function is called after the section sizes and offsets have
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been set. If we are generating embedded relocs, it calls a special
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BFD backend routine to do the work. */
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static void
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mips_elf${ELFSIZE}_after_allocation ()
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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 && (! link_info.relocateable))
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{
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bfd *abfd;
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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, ".sdata");
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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, ".rel.sdata");
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ASSERT (relsec != NULL);
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if (! bfd_mips_elf${ELFSIZE}_create_embedded_relocs (abfd,
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&link_info,
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datasec,
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relsec,
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&errmsg))
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{
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if (errmsg == NULL)
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einfo ("%B%X: can not create runtime reloc information: %E\n",
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abfd);
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else
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einfo ("%X%B: can not create runtime reloc information: %s\n",
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abfd, errmsg);
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}
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}
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}
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#endif /* SUPPORT_EMBEDDED_RELOCS */
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}
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EOF
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# We have our own after_open and after_allocation functions, but they call
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# the standard routines, so give them a different name.
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LDEMUL_AFTER_OPEN=mips_elf${ELFSIZE}_after_open
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LDEMUL_AFTER_ALLOCATION=mips_elf${ELFSIZE}_after_allocation
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