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Diffstat (limited to 'ld/emultempl/bfin.em')
| -rw-r--r-- | ld/emultempl/bfin.em | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/ld/emultempl/bfin.em b/ld/emultempl/bfin.em new file mode 100644 index 0000000..1c1cd8d --- /dev/null +++ b/ld/emultempl/bfin.em @@ -0,0 +1,174 @@ +# This shell script emits a C file. -*- C -*- +# Copyright 2000, 2001, 2003 Free Software Foundation, Inc. +# Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on armelf.em +# +# This file is part of GLD, the Gnu Linker. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +# This file is sourced from elf32.em, and defines some extra routines for bfin +# embedded systems using ELF and for some other systems using bfin ELF. While +# it is sourced from elf32.em for all bfin ELF configurations, here we include +# only the features we want depending on the configuration. + +case ${target} in + bfin*-*-elf) + echo "#define SUPPORT_EMBEDDED_RELOCS" >>e${EMULATION_NAME}.c + ;; +esac + +cat >>e${EMULATION_NAME}.c <<EOF + +#ifdef SUPPORT_EMBEDDED_RELOCS +static void check_sections (bfd *, asection *, void *); +#endif + +/* This function is run after all the input files have been opened. */ + +static void +bfin_elf_after_open (void) +{ + /* Call the standard elf routine. */ + gld${EMULATION_NAME}_after_open (); + +#ifdef SUPPORT_EMBEDDED_RELOCS + if (command_line.embedded_relocs + && (! link_info.relocatable)) + { + bfd *abfd; + + /* In the embedded relocs mode we create a .emreloc section for each + input file with a nonzero .data section. The BFD backend will fill in + these sections with magic numbers which can be used to relocate the + data section at run time. */ + for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) + { + asection *datasec; + + /* As first-order business, make sure that each input BFD is either + COFF or ELF. We need to call a special BFD backend function to + generate the embedded relocs, and we have such functions only for + COFF and ELF. */ + if (bfd_get_flavour (abfd) != bfd_target_coff_flavour + && bfd_get_flavour (abfd) != bfd_target_elf_flavour) + einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n"); + + datasec = bfd_get_section_by_name (abfd, ".data"); + + /* Note that we assume that the reloc_count field has already + been set up. We could call bfd_get_reloc_upper_bound, but + that returns the size of a memory buffer rather than a reloc + count. We do not want to call bfd_canonicalize_reloc, + because although it would always work it would force us to + read in the relocs into BFD canonical form, which would waste + a significant amount of time and memory. */ + if (datasec != NULL && datasec->reloc_count > 0) + { + asection *relsec; + + relsec = bfd_make_section (abfd, ".emreloc"); + if (relsec == NULL + || ! bfd_set_section_flags (abfd, relsec, + (SEC_ALLOC + | SEC_LOAD + | SEC_HAS_CONTENTS + | SEC_IN_MEMORY)) + || ! bfd_set_section_alignment (abfd, relsec, 2) + || ! bfd_set_section_size (abfd, relsec, + datasec->reloc_count * 12)) + einfo ("%F%B: can not create .emreloc section: %E\n"); + } + + /* Double check that all other data sections are empty, as is + required for embedded PIC code. */ + bfd_map_over_sections (abfd, check_sections, datasec); + } + } +#endif /* SUPPORT_EMBEDDED_RELOCS */ +} + +#ifdef SUPPORT_EMBEDDED_RELOCS +/* Check that of the data sections, only the .data section has + relocs. This is called via bfd_map_over_sections. */ + +static void +check_sections (bfd *abfd, asection *sec, void *datasec) +{ + if ((bfd_get_section_flags (abfd, sec) & SEC_DATA) + && sec != datasec + && sec->reloc_count != 0) + einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n", + abfd, bfd_get_section_name (abfd, sec)); +} + +#endif /* SUPPORT_EMBEDDED_RELOCS */ + +/* This function is called after the section sizes and offsets have + been set. */ + +static void +bfin_elf_after_allocation (void) +{ + /* Call the standard elf routine. */ + after_allocation_default (); + +#ifdef SUPPORT_EMBEDDED_RELOCS + if (command_line.embedded_relocs + && (! link_info.relocatable)) + { + bfd *abfd; + + /* If we are generating embedded relocs, call a special BFD backend + routine to do the work. */ + for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) + { + asection *datasec, *relsec; + char *errmsg; + + datasec = bfd_get_section_by_name (abfd, ".data"); + + if (datasec == NULL || datasec->reloc_count == 0) + continue; + + relsec = bfd_get_section_by_name (abfd, ".emreloc"); + ASSERT (relsec != NULL); + + if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) + { + if (! bfd_bfin_elf32_create_embedded_relocs (abfd, &link_info, + datasec, relsec, + &errmsg)) + { + if (errmsg == NULL) + einfo ("%B%X: can not create runtime reloc information: %E\n", + abfd); + else + einfo ("%X%B: can not create runtime reloc information: %s\n", + abfd, errmsg); + } + } + else + abort (); + } + } +#endif /* SUPPORT_EMBEDDED_RELOCS */ +} + +EOF + +# We have our own after_open and after_allocation functions, but they call +# the standard routines, so give them a different name. +LDEMUL_AFTER_OPEN=bfin_elf_after_open +LDEMUL_AFTER_ALLOCATION=bfin_elf_after_allocation |