249 lines
7.5 KiB
Plaintext
249 lines
7.5 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# It does some substitutions.
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if [ -z "$MACHINE" ]; then
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OUTPUT_ARCH=${ARCH}
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else
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OUTPUT_ARCH=${ARCH}:${MACHINE}
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fi
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cat >e${EMULATION_NAME}.c <<EOF
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/* This file is is generated by a shell script. DO NOT EDIT! */
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/* Handle embedded relocs for MIPS.
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Copyright 1994, 1995, 1997, 2000, 2002, 2003, 2004
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Free Software Foundation, Inc.
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Written by Ian Lance Taylor <ian@cygnus.com> based on generic.em.
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This file is part of GLD, the Gnu Linker.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define TARGET_IS_${EMULATION_NAME}
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#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
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#include "ld.h"
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#include "ldmain.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 "ldfile.h"
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#include "ldemul.h"
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static void check_sections (bfd *, asection *, void *);
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static void
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gld${EMULATION_NAME}_before_parse (void)
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{
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#ifndef TARGET_ /* I.e., if not generic. */
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ldfile_set_output_arch ("${OUTPUT_ARCH}", bfd_arch_`echo ${ARCH} | sed -e 's/:.*//'`);
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#endif /* not TARGET_ */
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}
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/* This function is run after all the input files have been opened.
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We create a .rel.sdata section for each input file with a non zero
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.sdata section. The BFD backend will fill in these sections with
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magic numbers which can be used to relocate the data section at run
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time. This will only do the right thing if all the input files
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have been compiled using -membedded-pic. */
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static void
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gld${EMULATION_NAME}_after_open (void)
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{
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bfd *abfd;
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if (! command_line.embedded_relocs
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|| link_info.relocatable)
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return;
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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 ECOFF. It
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better be, as we are directly calling an ECOFF backend function. */
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if (bfd_get_flavour (abfd) != bfd_target_ecoff_flavour)
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einfo ("%F%B: all input objects must be ECOFF 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, 2)
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|| ! bfd_set_section_size (abfd, relsec,
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datasec->reloc_count * 4))
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einfo ("%F%B: can not create .rel.sdata 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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/* 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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check_sections (bfd *abfd, asection *sec, void *sdatasec)
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{
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if ((bfd_get_section_flags (abfd, sec) & SEC_CODE) == 0
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&& sec != sdatasec
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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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/* 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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gld${EMULATION_NAME}_after_allocation (void)
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{
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bfd *abfd;
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if (! command_line.embedded_relocs
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|| link_info.relocatable)
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return;
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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_ecoff_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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}
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static char *
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gld${EMULATION_NAME}_get_script (int *isfile)
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EOF
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if test -n "$COMPILE_IN"
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then
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# Scripts compiled in.
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# sed commands to quote an ld script as a C string.
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sc="-f stringify.sed"
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cat >>e${EMULATION_NAME}.c <<EOF
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{
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*isfile = 0;
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if (link_info.relocatable && config.build_constructors)
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return
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EOF
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sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
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echo ' ; else if (link_info.relocatable) return' >> e${EMULATION_NAME}.c
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sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
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echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
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sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
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echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
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sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
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echo ' ; else return' >> e${EMULATION_NAME}.c
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sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
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echo '; }' >> e${EMULATION_NAME}.c
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else
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# Scripts read from the filesystem.
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cat >>e${EMULATION_NAME}.c <<EOF
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{
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*isfile = 1;
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if (link_info.relocatable && config.build_constructors)
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return "ldscripts/${EMULATION_NAME}.xu";
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else if (link_info.relocatable)
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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/${EMULATION_NAME}.xn";
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else
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return "ldscripts/${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${EMULATION_NAME}_before_parse,
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syslib_default,
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hll_default,
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after_parse_default,
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gld${EMULATION_NAME}_after_open,
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gld${EMULATION_NAME}_after_allocation,
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set_output_arch_default,
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ldemul_default_target,
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before_allocation_default,
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gld${EMULATION_NAME}_get_script,
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"${EMULATION_NAME}",
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"${OUTPUT_FORMAT}",
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NULL, /* finish */
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NULL, /* create output section statements */
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NULL, /* open dynamic archive */
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NULL, /* place orphan */
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NULL, /* set symbols */
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NULL, /* parse args */
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NULL, /* add_options */
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NULL, /* handle_option */
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NULL, /* unrecognized file */
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NULL, /* list options */
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NULL, /* recognized file */
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NULL, /* find_potential_libraries */
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NULL /* new_vers_pattern */
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};
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EOF
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