From 20bccb34854e0468796b72f96f3c9b1fb1978680 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Fri, 21 Jul 2000 23:31:53 +0000 Subject: Applied Michael's Sokolov's patch to implement --embedded-relocs for m68k coff. --- ld/emultempl/m68kcoff.em | 245 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 245 insertions(+) create mode 100644 ld/emultempl/m68kcoff.em (limited to 'ld/emultempl/m68kcoff.em') diff --git a/ld/emultempl/m68kcoff.em b/ld/emultempl/m68kcoff.em new file mode 100644 index 0000000..06422d3 --- /dev/null +++ b/ld/emultempl/m68kcoff.em @@ -0,0 +1,245 @@ +# This shell script emits a C file. -*- C -*- +# It does some substitutions. +cat >e${EMULATION_NAME}.c <, based on generic.em + by Steve Chamberlain , embedded relocs code based on + mipsecoff.em by Ian Lance Taylor . + +This file is part of GLD, the Gnu Linker. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#define TARGET_IS_${EMULATION_NAME} + +#include "bfd.h" +#include "sysdep.h" +#include "bfdlink.h" + +#include "ld.h" +#include "ldmain.h" +#include "ldemul.h" +#include "ldfile.h" +#include "ldmisc.h" + +static void gld${EMULATION_NAME}_before_parse PARAMS ((void)); +static void gld${EMULATION_NAME}_after_open PARAMS ((void)); +static void check_sections PARAMS ((bfd *, asection *, PTR)); +static void gld${EMULATION_NAME}_after_allocation PARAMS ((void)); +static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile)); + +static void +gld${EMULATION_NAME}_before_parse () +{ +#ifndef TARGET_ /* I.e., if not generic. */ + ldfile_set_output_arch ("`echo ${ARCH}`"); +#endif /* not TARGET_ */ +} + +/* This function is run after all the input files have been opened. + We create a .emreloc section for each input file with a non zero + .data section. The BFD backend will fill in these sections with + magic numbers which can be used to relocate the data section at run + time. */ + +static void +gld${EMULATION_NAME}_after_open () +{ + bfd *abfd; + + if (! command_line.embedded_relocs + || link_info.relocateable) + return; + + 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 COFF. It + better be, as we are directly calling a COFF backend function. */ + if (bfd_get_flavour (abfd) != bfd_target_coff_flavour) + einfo ("%F%B: all input objects must be COFF 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, (PTR) datasec); + } +} + +/* Check that of the data sections, only the .data section has + relocs. This is called via bfd_map_over_sections. */ + +static void +check_sections (abfd, sec, datasec) + bfd *abfd; + asection *sec; + PTR datasec; +{ + if ((bfd_get_section_flags (abfd, sec) & SEC_DATA) + && sec != (asection *) 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)); +} + +/* This function is called after the section sizes and offsets have + been set. If we are generating embedded relocs, it calls a special + BFD backend routine to do the work. */ + +static void +gld${EMULATION_NAME}_after_allocation () +{ + bfd *abfd; + + if (! command_line.embedded_relocs + || link_info.relocateable) + return; + + for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next) + { + asection *datasec, *relsec; + char *errmsg; + + datasec = bfd_get_section_by_name (abfd, ".data"); + + if (datasec == NULL || datasec->reloc_count == 0) + continue; + + relsec = bfd_get_section_by_name (abfd, ".emreloc"); + ASSERT (relsec != NULL); + + if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info, + datasec, relsec, + &errmsg)) + { + if (errmsg == NULL) + einfo ("%B%X: can not create runtime reloc information: %E\n", + abfd); + else + einfo ("%X%B: can not create runtime reloc information: %s\n", + abfd, errmsg); + } + } +} + +static char * +gld${EMULATION_NAME}_get_script(isfile) + int *isfile; +EOF + +if test -n "$COMPILE_IN" +then +# Scripts compiled in. + +# sed commands to quote an ld script as a C string. +sc="-f stringify.sed" + +cat >>e${EMULATION_NAME}.c <> e${EMULATION_NAME}.c +echo ' ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c +sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c +echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c +sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c +echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c +sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c +echo ' ; else return' >> e${EMULATION_NAME}.c +sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c +echo '; }' >> e${EMULATION_NAME}.c + +else +# Scripts read from the filesystem. + +cat >>e${EMULATION_NAME}.c <>e${EMULATION_NAME}.c <