299 lines
8.4 KiB
Plaintext
299 lines
8.4 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# It does some substitutions.
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fragment <<EOF
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/* This file is is generated by a shell script. DO NOT EDIT! */
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/* Emulate the original gld for the given ${EMULATION_NAME}
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Copyright (C) 2014-2015 Free Software Foundation, Inc.
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Written by Steve Chamberlain steve@cygnus.com
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Extended for the MSP430 by Nick Clifton nickc@redhat.com
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This file is part of the GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#define TARGET_IS_${EMULATION_NAME}
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#include "sysdep.h"
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#include "bfd.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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#include "libiberty.h"
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EOF
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# Import any needed special functions and/or overrides.
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#
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if test -n "$EXTRA_EM_FILE" ; then
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source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
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fi
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if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
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fragment <<EOF
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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 ("`echo ${ARCH}`", bfd_arch_unknown);
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#endif /* not TARGET_ */
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/* The MSP430 port *needs* linker relaxtion in order to cope with large
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functions where conditional branches do not fit into a +/- 1024 byte range. */
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if (! link_info.relocatable)
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TARGET_ENABLE_RELAXATION;
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}
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EOF
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fi
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if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
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fragment <<EOF
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static char *
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gld${EMULATION_NAME}_get_script (int *isfile)
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EOF
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if test x"$COMPILE_IN" = xyes
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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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fragment <<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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fragment <<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/${EMULATION_NAME}.x";
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}
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EOF
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fi
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fi
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if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
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fragment <<EOF
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/* Helper function for place_orphan that computes the size
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of sections already mapped to the given statement. */
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static bfd_size_type
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scan_children (lang_statement_union_type * l)
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{
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bfd_size_type amount = 0;
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while (l != NULL)
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{
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switch (l->header.type)
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{
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case lang_input_section_enum:
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if (l->input_section.section->flags & SEC_ALLOC)
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amount += l->input_section.section->size;
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break;
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case lang_constructors_statement_enum:
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case lang_assignment_statement_enum:
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break;
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case lang_wild_statement_enum:
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amount += scan_children (l->wild_statement.children.head);
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break;
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default:
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fprintf (stderr, "msp430 orphan placer: unhandled lang type %d\n", l->header.type);
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break;
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}
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l = l->header.next;
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}
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return amount;
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}
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/* Place an orphan section. We use this to put .either sections
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into either their lower or their upper equivalents. */
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static lang_output_section_statement_type *
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gld${EMULATION_NAME}_place_orphan (asection * s,
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const char * secname,
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int constraint)
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{
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char * lower_name;
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char * upper_name;
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char * name;
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lang_output_section_statement_type * lower;
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lang_output_section_statement_type * upper;
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lang_output_section_statement_type * os;
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if ((s->flags & SEC_ALLOC) == 0)
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return NULL;
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if (link_info.relocatable)
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return NULL;
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/* If constraints are involved let the linker handle the placement normally. */
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if (constraint != 0)
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return NULL;
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/* We only need special handling for .either sections. */
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if (strncmp (secname, ".either.", 8) != 0)
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return NULL;
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/* Skip the .either prefix. */
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secname += 7;
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/* Compute the names of the corresponding upper and lower
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sections. If the input section name contains another period,
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only use the part of the name before the second dot. */
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if (strchr (secname + 1, '.') != NULL)
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{
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name = ACONCAT ((secname, NULL));
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* strchr (name + 1, '.') = 0;
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}
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else
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name = (char *) secname;
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lower_name = ACONCAT ((".lower", name, NULL));
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upper_name = ACONCAT ((".upper", name, NULL));
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/* Find the corresponding lower and upper sections. */
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lower = lang_output_section_find (lower_name);
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upper = lang_output_section_find (upper_name);
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/* If the upper section does not exist, try again without the suffix. */
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if (upper == NULL)
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upper = lang_output_section_find (name);
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if (lower == NULL)
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{
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os = upper;
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if (upper == NULL)
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{
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einfo ("%P: error: no section named %s or %s in linker script\n", lower_name, upper_name);
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return NULL;
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}
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}
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else if (upper == NULL)
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os = lower;
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else if (lower->region == NULL)
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os = lower;
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/* If the section is too big for the region containing
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the lower section then do not even try to use it. */
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else if (lower->region->length < s->size)
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os = upper;
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else
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{
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bfd_size_type amount = 0;
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struct lang_output_section_statement_struct * p;
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amount += scan_children (lower->children.head);
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/* Also check forwards for other statements assigned to the same region. */
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for (p = lower->next; p != NULL; p = p->next)
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if (p->region == lower->region)
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amount += scan_children (p->children.head);
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/* Scan backwards as well. */
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for (p = lower->prev; p != NULL; p = p->prev)
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if (p->region == lower->region)
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amount += scan_children (p->children.head);
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if (amount + s->size >= lower->region->length)
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os = upper;
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else
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os = lower;
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}
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lang_add_section (& os->children, s, NULL, os);
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return os;
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}
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EOF
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fi
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fragment <<EOF
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struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
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{
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${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
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${LDEMUL_SYSLIB-syslib_default},
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${LDEMUL_HLL-hll_default},
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${LDEMUL_AFTER_PARSE-after_parse_default},
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${LDEMUL_AFTER_OPEN-after_open_default},
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${LDEMUL_AFTER_ALLOCATION-after_allocation_default},
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${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
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${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
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${LDEMUL_BEFORE_ALLOCATION-before_allocation_default},
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${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
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"${EMULATION_NAME}",
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"${OUTPUT_FORMAT}",
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${LDEMUL_FINISH-finish_default},
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${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
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${LDEMUL_OPEN_DYNAMIC_ARCHIVE-NULL},
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${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
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${LDEMUL_SET_SYMBOLS-NULL},
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${LDEMUL_PARSE_ARGS-NULL},
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${LDEMUL_ADD_OPTIONS-NULL},
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${LDEMUL_HANDLE_OPTION-NULL},
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${LDEMUL_UNRECOGNIZED_FILE-NULL},
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${LDEMUL_LIST_OPTIONS-NULL},
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${LDEMUL_RECOGNIZED_FILE-NULL},
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${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
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${LDEMUL_NEW_VERS_PATTERN-NULL},
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${LDEMUL_EXTRA_MAP_FILE_TEXT-NULL}
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};
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EOF
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#
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# Local Variables:
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# mode: c
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# End:
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