mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2025-01-06 12:09:26 +08:00
1a9f72a7a8
The MSP430 linker shuffles input sections with names beginning with ".either" between the upper and lower memory regions, to try to avoid one region overflowing when there is space in the other region. However, when an ".either" input section attached to the tail of an output section was moved to a different output section in the other region, that tail wasn't being updated to the new section at the end of the original output section. This caused a bug where a shuffled section could end up in the middle of another section in the output executable, resulting in corrupted code or data. When changing the output section of an input section attached to the tail of its output section, that tail is now updated to point to the new input section at the end of the section list. ld/ChangeLog: 2020-08-06 Jozef Lawrynowicz <jozef.l@mittosystems.com> * emultempl/msp430.em (change_output_section): Update the tail of the output section statement list when moving the original tail to a different output section. (eval_upper_either_sections): Don't move sections from the upper region to the lower region unless the upper region is overflowing.
870 lines
24 KiB
Plaintext
870 lines
24 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 ${EMULATION_NAME}
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Copyright (C) 2014-2020 Free Software Foundation, Inc.
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Written by Steve Chamberlain steve@cygnus.com
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Extended for the MSP430 by Nick Clifton nickc@redhat.com
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This file is part of the GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#define TARGET_IS_${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 "ctf-api.h"
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#include "ld.h"
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#include "getopt.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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#include <ldgram.h>
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enum regions
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{
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REGION_NONE = 0,
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REGION_LOWER,
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REGION_UPPER,
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REGION_EITHER = 3,
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};
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enum either_placement_stage
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{
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LOWER_TO_UPPER,
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UPPER_TO_LOWER,
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};
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enum { ROM, RAM };
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static int data_region = REGION_NONE;
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static int code_region = REGION_NONE;
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static bfd_boolean disable_sec_transformation = FALSE;
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#define MAX_PREFIX_LENGTH 7
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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 ${ARCH}`", bfd_arch_unknown);
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#endif /* not TARGET_ */
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/* The MSP430 port *needs* linker relaxtion in order to cope with large
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functions where conditional branches do not fit into a +/- 1024 byte range. */
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if (!bfd_link_relocatable (&link_info))
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TARGET_ENABLE_RELAXATION;
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}
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EOF
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fi
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if test x"$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 (bfd_link_relocatable (&link_info) && config.build_constructors)
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return
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EOF
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sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
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echo ' ; else if (bfd_link_relocatable (&link_info)) return' >> e${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 (bfd_link_relocatable (&link_info) && config.build_constructors)
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return "ldscripts/${EMULATION_NAME}.xu";
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else if (bfd_link_relocatable (&link_info))
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return "ldscripts/${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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static unsigned int
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data_statement_size (lang_data_statement_type *d)
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{
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unsigned int size = 0;
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switch (d->type)
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{
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case QUAD:
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case SQUAD:
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size = QUAD_SIZE;
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break;
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case LONG:
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size = LONG_SIZE;
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break;
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case SHORT:
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size = SHORT_SIZE;
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break;
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case BYTE:
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size = BYTE_SIZE;
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break;
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default:
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einfo (_("%P: error: unhandled data_statement size\n"));
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FAIL ();
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}
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return size;
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}
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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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case lang_padding_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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case lang_data_statement_enum:
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amount += data_statement_size (&l->data_statement);
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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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#define WARN_UPPER 0
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#define WARN_LOWER 1
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#define WARN_TEXT 0
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#define WARN_DATA 1
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#define WARN_BSS 2
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#define WARN_RODATA 3
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/* Warn only once per output section.
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* NAME starts with ".upper." or ".lower.". */
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static void
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warn_no_output_section (const char *name)
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{
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static bfd_boolean warned[2][4] = {{FALSE, FALSE, FALSE, FALSE},
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{FALSE, FALSE, FALSE, FALSE}};
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int i = WARN_LOWER;
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if (strncmp (name, ".upper.", 7) == 0)
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i = WARN_UPPER;
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if (!warned[i][WARN_TEXT] && strcmp (name + 6, ".text") == 0)
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warned[i][WARN_TEXT] = TRUE;
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else if (!warned[i][WARN_DATA] && strcmp (name + 6, ".data") == 0)
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warned[i][WARN_DATA] = TRUE;
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else if (!warned[i][WARN_BSS] && strcmp (name + 6, ".bss") == 0)
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warned[i][WARN_BSS] = TRUE;
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else if (!warned[i][WARN_RODATA] && strcmp (name + 6, ".rodata") == 0)
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warned[i][WARN_RODATA] = TRUE;
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else
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return;
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einfo ("%P: warning: no input section rule matches %s in linker script\n",
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name);
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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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char * buf = NULL;
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lang_output_section_statement_type * lower;
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lang_output_section_statement_type * upper;
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if ((s->flags & SEC_ALLOC) == 0)
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return NULL;
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if (bfd_link_relocatable (&link_info))
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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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if (strncmp (secname, ".upper.", 7) == 0
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|| strncmp (secname, ".lower.", 7) == 0)
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{
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warn_no_output_section (secname);
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return NULL;
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}
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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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buf = name = xstrdup (secname);
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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 = concat (".lower", name, NULL);
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upper_name = concat (".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 (lower == NULL && upper == NULL)
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{
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einfo (_("%P: error: no section named %s or %s in linker script\n"),
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lower_name, upper_name);
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goto end;
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}
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else if (lower == NULL)
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{
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lower = lang_output_section_find (name);
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if (lower == NULL)
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{
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einfo (_("%P: error: no section named %s in linker script\n"), name);
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goto end;
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}
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}
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/* Always place orphaned sections in lower. Optimal placement of either
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sections is performed later, once section sizes have been finalized. */
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lang_add_section (& lower->children, s, NULL, lower);
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end:
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free (upper_name);
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free (lower_name);
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free (buf);
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return lower;
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}
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EOF
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fi
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fragment <<EOF
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static bfd_boolean
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change_output_section (lang_statement_union_type **head,
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asection *s,
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lang_output_section_statement_type *new_os,
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lang_output_section_statement_type *old_os)
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{
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asection *is;
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lang_statement_union_type * prev = NULL;
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lang_statement_union_type * curr;
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curr = *head;
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while (curr != NULL)
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{
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switch (curr->header.type)
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{
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case lang_input_section_enum:
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is = curr->input_section.section;
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if (is == s)
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{
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lang_statement_list_type *old_list
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= (lang_statement_list_type *) &old_os->children;
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s->output_section = NULL;
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lang_add_section (&new_os->children, s, NULL, new_os);
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/* Remove the section from the old output section. */
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if (prev == NULL)
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*head = curr->header.next;
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else
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prev->header.next = curr->header.next;
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/* If the input section we just moved is the tail of the old
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output section, then we also need to adjust that tail. */
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if (old_list->tail == (lang_statement_union_type **) curr)
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old_list->tail = (lang_statement_union_type **) prev;
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return TRUE;
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}
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break;
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case lang_wild_statement_enum:
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if (change_output_section (&(curr->wild_statement.children.head),
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s, new_os, old_os))
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return TRUE;
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break;
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default:
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break;
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}
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prev = curr;
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curr = curr->header.next;
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}
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return FALSE;
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}
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static void
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add_region_prefix (bfd *abfd ATTRIBUTE_UNUSED, asection *s,
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void *unused ATTRIBUTE_UNUSED)
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{
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const char *curr_name = bfd_section_name (s);
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int region = REGION_NONE;
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if (strncmp (curr_name, ".text", 5) == 0)
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region = code_region;
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else if (strncmp (curr_name, ".data", 5) == 0)
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region = data_region;
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else if (strncmp (curr_name, ".bss", 4) == 0)
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region = data_region;
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else if (strncmp (curr_name, ".rodata", 7) == 0)
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region = data_region;
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else
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return;
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switch (region)
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{
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case REGION_NONE:
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break;
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case REGION_UPPER:
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bfd_rename_section (s, concat (".upper", curr_name, NULL));
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break;
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case REGION_LOWER:
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bfd_rename_section (s, concat (".lower", curr_name, NULL));
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break;
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case REGION_EITHER:
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s->name = concat (".either", curr_name, NULL);
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break;
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default:
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/* Unreachable. */
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FAIL ();
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break;
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}
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}
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static void
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msp430_elf_after_open (void)
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{
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bfd *abfd;
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gld${EMULATION_NAME}_after_open ();
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/* If neither --code-region or --data-region have been passed, do not
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transform sections names. */
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if ((code_region == REGION_NONE && data_region == REGION_NONE)
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|| disable_sec_transformation)
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return;
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for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
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bfd_map_over_sections (abfd, add_region_prefix, NULL);
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}
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#define OPTION_CODE_REGION 321
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#define OPTION_DATA_REGION (OPTION_CODE_REGION + 1)
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#define OPTION_DISABLE_TRANS (OPTION_CODE_REGION + 2)
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static void
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gld${EMULATION_NAME}_add_options
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(int ns, char **shortopts, int nl, struct option **longopts,
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int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
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{
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static const char xtra_short[] = { };
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static const struct option xtra_long[] =
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{
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{ "code-region", required_argument, NULL, OPTION_CODE_REGION },
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{ "data-region", required_argument, NULL, OPTION_DATA_REGION },
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{ "disable-sec-transformation", no_argument, NULL,
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OPTION_DISABLE_TRANS },
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{ NULL, no_argument, NULL, 0 }
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};
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*shortopts = (char *) xrealloc (*shortopts, ns + sizeof (xtra_short));
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memcpy (*shortopts + ns, &xtra_short, sizeof (xtra_short));
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*longopts = (struct option *)
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xrealloc (*longopts, nl * sizeof (struct option) + sizeof (xtra_long));
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memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
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}
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static void
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gld${EMULATION_NAME}_list_options (FILE * file)
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{
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fprintf (file, _(" --code-region={either,lower,upper,none}\n\
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Transform .text* sections to {either,lower,upper,none}.text* sections\n"));
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fprintf (file, _(" --data-region={either,lower,upper,none}\n\
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Transform .data*, .rodata* and .bss* sections to\n\
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{either,lower,upper,none}.{bss,data,rodata}* sections\n"));
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fprintf (file, _(" --disable-sec-transformation\n\
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Disable transformation of .{text,data,bss,rodata}* sections to\n\
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add the {either,lower,upper,none} prefixes\n"));
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}
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static bfd_boolean
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gld${EMULATION_NAME}_handle_option (int optc)
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{
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switch (optc)
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||
{
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case OPTION_CODE_REGION:
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if (strcmp (optarg, "upper") == 0)
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code_region = REGION_UPPER;
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else if (strcmp (optarg, "lower") == 0)
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code_region = REGION_LOWER;
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else if (strcmp (optarg, "either") == 0)
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code_region = REGION_EITHER;
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else if (strcmp (optarg, "none") == 0)
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code_region = REGION_NONE;
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else if (strlen (optarg) == 0)
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{
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einfo (_("%P: --code-region requires an argument: "
|
||
"{upper,lower,either,none}\n"));
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
einfo (_("%P: error: unrecognized argument to --code-region= option: "
|
||
"\"%s\"\n"), optarg);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case OPTION_DATA_REGION:
|
||
if (strcmp (optarg, "upper") == 0)
|
||
data_region = REGION_UPPER;
|
||
else if (strcmp (optarg, "lower") == 0)
|
||
data_region = REGION_LOWER;
|
||
else if (strcmp (optarg, "either") == 0)
|
||
data_region = REGION_EITHER;
|
||
else if (strcmp (optarg, "none") == 0)
|
||
data_region = REGION_NONE;
|
||
else if (strlen (optarg) == 0)
|
||
{
|
||
einfo (_("%P: --data-region requires an argument: "
|
||
"{upper,lower,either,none}\n"));
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
einfo (_("%P: error: unrecognized argument to --data-region= option: "
|
||
"\"%s\"\n"), optarg);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case OPTION_DISABLE_TRANS:
|
||
disable_sec_transformation = TRUE;
|
||
break;
|
||
|
||
default:
|
||
return FALSE;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
static void
|
||
eval_upper_either_sections (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *s, void *data)
|
||
{
|
||
const char * base_sec_name;
|
||
const char * curr_name;
|
||
char * either_name;
|
||
int curr_region;
|
||
|
||
lang_output_section_statement_type * lower;
|
||
lang_output_section_statement_type * upper;
|
||
static bfd_size_type *lower_size = 0;
|
||
static bfd_size_type *upper_size = 0;
|
||
static bfd_size_type lower_size_rom = 0;
|
||
static bfd_size_type lower_size_ram = 0;
|
||
static bfd_size_type upper_size_rom = 0;
|
||
static bfd_size_type upper_size_ram = 0;
|
||
|
||
if ((s->flags & SEC_ALLOC) == 0)
|
||
return;
|
||
if (bfd_link_relocatable (&link_info))
|
||
return;
|
||
|
||
base_sec_name = (const char *) data;
|
||
curr_name = bfd_section_name (s);
|
||
|
||
/* Only concerned with .either input sections in the upper output section. */
|
||
either_name = concat (".either", base_sec_name, NULL);
|
||
if (strncmp (curr_name, either_name, strlen (either_name)) != 0
|
||
|| strncmp (s->output_section->name, ".upper", 6) != 0)
|
||
goto end;
|
||
|
||
lower = lang_output_section_find (concat (".lower", base_sec_name, NULL));
|
||
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
|
||
|
||
if (upper == NULL || upper->region == NULL)
|
||
goto end;
|
||
else if (lower == NULL)
|
||
lower = lang_output_section_find (base_sec_name);
|
||
if (lower == NULL || lower->region == NULL)
|
||
goto end;
|
||
|
||
if (strcmp (base_sec_name, ".text") == 0
|
||
|| strcmp (base_sec_name, ".rodata") == 0)
|
||
curr_region = ROM;
|
||
else
|
||
curr_region = RAM;
|
||
|
||
if (curr_region == ROM)
|
||
{
|
||
if (lower_size_rom == 0)
|
||
{
|
||
lower_size_rom = lower->region->current - lower->region->origin;
|
||
upper_size_rom = upper->region->current - upper->region->origin;
|
||
}
|
||
lower_size = &lower_size_rom;
|
||
upper_size = &upper_size_rom;
|
||
}
|
||
else if (curr_region == RAM)
|
||
{
|
||
if (lower_size_ram == 0)
|
||
{
|
||
lower_size_ram = lower->region->current - lower->region->origin;
|
||
upper_size_ram = upper->region->current - upper->region->origin;
|
||
}
|
||
lower_size = &lower_size_ram;
|
||
upper_size = &upper_size_ram;
|
||
}
|
||
|
||
/* If the upper region is overflowing, try moving sections to the lower
|
||
region.
|
||
Note that there isn't any general benefit to using lower memory over upper
|
||
memory, so we only move sections around with the goal of making the program
|
||
fit. */
|
||
if (*upper_size > upper->region->length
|
||
&& *lower_size + s->size < lower->region->length)
|
||
{
|
||
if (change_output_section (&(upper->children.head), s, lower, upper))
|
||
{
|
||
*upper_size -= s->size;
|
||
*lower_size += s->size;
|
||
}
|
||
}
|
||
end:
|
||
free (either_name);
|
||
}
|
||
|
||
static void
|
||
eval_lower_either_sections (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *s, void *data)
|
||
{
|
||
const char * base_sec_name;
|
||
const char * curr_name;
|
||
char * either_name;
|
||
int curr_region;
|
||
lang_output_section_statement_type * output_sec;
|
||
lang_output_section_statement_type * lower;
|
||
lang_output_section_statement_type * upper;
|
||
|
||
static bfd_size_type *lower_size = 0;
|
||
static bfd_size_type lower_size_rom = 0;
|
||
static bfd_size_type lower_size_ram = 0;
|
||
|
||
if ((s->flags & SEC_ALLOC) == 0)
|
||
return;
|
||
if (bfd_link_relocatable (&link_info))
|
||
return;
|
||
|
||
base_sec_name = (const char *) data;
|
||
curr_name = bfd_section_name (s);
|
||
|
||
/* Only concerned with .either input sections in the lower or "default"
|
||
output section i.e. not in the upper output section. */
|
||
either_name = concat (".either", base_sec_name, NULL);
|
||
if (strncmp (curr_name, either_name, strlen (either_name)) != 0
|
||
|| strncmp (s->output_section->name, ".upper", 6) == 0)
|
||
return;
|
||
|
||
if (strcmp (base_sec_name, ".text") == 0
|
||
|| strcmp (base_sec_name, ".rodata") == 0)
|
||
curr_region = ROM;
|
||
else
|
||
curr_region = RAM;
|
||
|
||
output_sec = lang_output_section_find (s->output_section->name);
|
||
|
||
/* If the output_section doesn't exist, this has already been reported in
|
||
place_orphan, so don't need to warn again. */
|
||
if (output_sec == NULL || output_sec->region == NULL)
|
||
goto end;
|
||
|
||
/* lower and output_sec might be the same, but in some cases an .either
|
||
section can end up in base_sec_name if it hasn't been placed by
|
||
place_orphan. */
|
||
lower = lang_output_section_find (concat (".lower", base_sec_name, NULL));
|
||
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
|
||
if (upper == NULL)
|
||
goto end;
|
||
|
||
if (curr_region == ROM)
|
||
{
|
||
if (lower_size_rom == 0)
|
||
{
|
||
/* Get the size of other items in the lower region that aren't the
|
||
sections to be moved around. */
|
||
lower_size_rom
|
||
= (output_sec->region->current - output_sec->region->origin)
|
||
- scan_children (output_sec->children.head);
|
||
if (output_sec != lower && lower != NULL)
|
||
lower_size_rom -= scan_children (lower->children.head);
|
||
}
|
||
lower_size = &lower_size_rom;
|
||
}
|
||
else if (curr_region == RAM)
|
||
{
|
||
if (lower_size_ram == 0)
|
||
{
|
||
lower_size_ram
|
||
= (output_sec->region->current - output_sec->region->origin)
|
||
- scan_children (output_sec->children.head);
|
||
if (output_sec != lower && lower != NULL)
|
||
lower_size_ram -= scan_children (lower->children.head);
|
||
}
|
||
lower_size = &lower_size_ram;
|
||
}
|
||
/* Move sections that cause the lower region to overflow to the upper region. */
|
||
if (*lower_size + s->size > output_sec->region->length)
|
||
change_output_section (&(output_sec->children.head), s, upper, output_sec);
|
||
else
|
||
*lower_size += s->size;
|
||
end:
|
||
free (either_name);
|
||
}
|
||
|
||
/* This function is similar to lang_relax_sections, but without the size
|
||
evaluation code that is always executed after relaxation. */
|
||
static void
|
||
intermediate_relax_sections (void)
|
||
{
|
||
int i = link_info.relax_pass;
|
||
|
||
/* The backend can use it to determine the current pass. */
|
||
link_info.relax_pass = 0;
|
||
|
||
while (i--)
|
||
{
|
||
bfd_boolean relax_again;
|
||
|
||
link_info.relax_trip = -1;
|
||
do
|
||
{
|
||
link_info.relax_trip++;
|
||
|
||
lang_do_assignments (lang_assigning_phase_enum);
|
||
|
||
lang_reset_memory_regions ();
|
||
|
||
relax_again = FALSE;
|
||
lang_size_sections (&relax_again, FALSE);
|
||
}
|
||
while (relax_again);
|
||
|
||
link_info.relax_pass++;
|
||
}
|
||
}
|
||
|
||
static void
|
||
msp430_elf_after_allocation (void)
|
||
{
|
||
int relax_count = 0;
|
||
unsigned int i;
|
||
/* Go over each section twice, once to place either sections that don't fit
|
||
in lower into upper, and then again to move any sections in upper that
|
||
fit in lower into lower. */
|
||
for (i = 0; i < 8; i++)
|
||
{
|
||
int placement_stage = (i < 4) ? LOWER_TO_UPPER : UPPER_TO_LOWER;
|
||
const char * base_sec_name;
|
||
lang_output_section_statement_type * upper;
|
||
|
||
switch (i % 4)
|
||
{
|
||
default:
|
||
case 0:
|
||
base_sec_name = ".text";
|
||
break;
|
||
case 1:
|
||
base_sec_name = ".data";
|
||
break;
|
||
case 2:
|
||
base_sec_name = ".bss";
|
||
break;
|
||
case 3:
|
||
base_sec_name = ".rodata";
|
||
break;
|
||
}
|
||
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
|
||
if (upper != NULL)
|
||
{
|
||
/* Can't just use one iteration over the all the sections to make
|
||
both lower->upper and upper->lower transformations because the
|
||
iterator encounters upper sections before all lower sections have
|
||
been examined. */
|
||
bfd *abfd;
|
||
|
||
if (placement_stage == LOWER_TO_UPPER)
|
||
{
|
||
/* Perform relaxation and get the final size of sections
|
||
before trying to fit .either sections in the correct
|
||
ouput sections. */
|
||
if (relax_count == 0)
|
||
{
|
||
intermediate_relax_sections ();
|
||
relax_count++;
|
||
}
|
||
for (abfd = link_info.input_bfds; abfd != NULL;
|
||
abfd = abfd->link.next)
|
||
{
|
||
bfd_map_over_sections (abfd, eval_lower_either_sections,
|
||
(void *) base_sec_name);
|
||
}
|
||
}
|
||
else if (placement_stage == UPPER_TO_LOWER)
|
||
{
|
||
/* Relax again before moving upper->lower. */
|
||
if (relax_count == 1)
|
||
{
|
||
intermediate_relax_sections ();
|
||
relax_count++;
|
||
}
|
||
for (abfd = link_info.input_bfds; abfd != NULL;
|
||
abfd = abfd->link.next)
|
||
{
|
||
bfd_map_over_sections (abfd, eval_upper_either_sections,
|
||
(void *) base_sec_name);
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|
||
gld${EMULATION_NAME}_after_allocation ();
|
||
}
|
||
|
||
struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
|
||
{
|
||
${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
|
||
${LDEMUL_SYSLIB-syslib_default},
|
||
${LDEMUL_HLL-hll_default},
|
||
${LDEMUL_AFTER_PARSE-after_parse_default},
|
||
msp430_elf_after_open,
|
||
after_check_relocs_default,
|
||
before_place_orphans_default,
|
||
msp430_elf_after_allocation,
|
||
${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
|
||
${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
|
||
${LDEMUL_BEFORE_ALLOCATION-before_allocation_default},
|
||
${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
|
||
"${EMULATION_NAME}",
|
||
"${OUTPUT_FORMAT}",
|
||
${LDEMUL_FINISH-finish_default},
|
||
${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
|
||
${LDEMUL_OPEN_DYNAMIC_ARCHIVE-NULL},
|
||
${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
|
||
${LDEMUL_SET_SYMBOLS-NULL},
|
||
${LDEMUL_PARSE_ARGS-NULL},
|
||
gld${EMULATION_NAME}_add_options,
|
||
gld${EMULATION_NAME}_handle_option,
|
||
${LDEMUL_UNRECOGNIZED_FILE-NULL},
|
||
gld${EMULATION_NAME}_list_options,
|
||
${LDEMUL_RECOGNIZED_FILE-NULL},
|
||
${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
|
||
${LDEMUL_NEW_VERS_PATTERN-NULL},
|
||
${LDEMUL_EXTRA_MAP_FILE_TEXT-NULL},
|
||
${LDEMUL_EMIT_CTF_EARLY-NULL},
|
||
${LDEMUL_EXAMINE_STRTAB_FOR_CTF-NULL},
|
||
${LDEMUL_PRINT_SYMBOL-NULL}
|
||
};
|
||
EOF
|
||
#
|
||
# Local Variables:
|
||
# mode: c
|
||
# End:
|