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+/* Copyright (C) 1991 Free Software Foundation, Inc.
+
+This file is part of GLD, the Gnu Linker.
+
+GLD 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 1, or (at your option)
+any later version.
+
+GLD 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 GLD; see the file COPYING. If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/*
+ * $Id$
+ *
+ * $Log$
+ * Revision 1.1 1991/03/21 21:29:04 gumby
+ * Initial revision
+ *
+ * Revision 1.2 1991/03/15 18:45:55 rich
+ * foo
+ *
+ * Revision 1.1 1991/03/13 00:48:37 chrisb
+ * Initial revision
+ *
+ * Revision 1.7 1991/03/10 19:15:03 sac
+ * Took out the abort() which had been put in the wrong place
+ * Updated the version #.
+ *
+ * Revision 1.6 1991/03/10 09:31:41 rich
+ * Modified Files:
+ * Makefile config.h ld-emul.c ld-emul.h ld-gld.c ld-gld960.c
+ * ld-lnk960.c ld.h lddigest.c ldexp.c ldexp.h ldfile.c ldfile.h
+ * ldgram.y ldinfo.h ldlang.c ldlang.h ldlex.h ldlex.l ldmain.c
+ * ldmain.h ldmisc.c ldmisc.h ldsym.c ldsym.h ldversion.c
+ * ldversion.h ldwarn.h ldwrite.c ldwrite.h y.tab.h
+ *
+ * As of this round of changes, ld now builds on all hosts of (Intel960)
+ * interest and copy passes my copy test on big endian hosts again.
+ *
+ * Revision 1.5 1991/03/09 03:25:08 sac
+ * Added support for LONG, SHORT and BYTE keywords in scripts
+ *
+ * Revision 1.4 1991/03/06 21:59:34 sac
+ * Completed G++ support
+ *
+ * Revision 1.3 1991/03/06 02:29:52 sac
+ * Added support for partial linking.
+ *
+ * Revision 1.2 1991/02/22 17:15:11 sac
+ * Added RCS keywords and copyrights
+ *
+*/
+
+/*
+ This module writes out the final image by reading sections from the
+ input files, relocating them and writing them out
+
+ There are two main paths through this module, one for normal
+ operation and one for partial linking.
+
+ During normal operation, raw section data is read along with the
+ associated relocation information, the relocation info applied and
+ the section data written out on a section by section basis.
+
+ When partially linking, all the relocation records are read to work
+ out how big the output relocation vector will be. Then raw data is
+ read, relocated and written section by section.
+
+ Written by Steve Chamberlain steve@cygnus.com
+
+*/
+
+
+#include "sysdep.h"
+#include "bfd.h"
+
+#include "ldlang.h"
+#include "ld.h"
+#include "ldwrite.h"
+#include "ldmisc.h"
+#include "ldsym.h"
+#include "ldgram.tab.h"
+
+
+
+char *ldmalloc();
+/* Static vars for do_warnings and subroutines of it */
+int list_unresolved_refs; /* List unresolved refs */
+int list_warning_symbols; /* List warning syms */
+int list_multiple_defs; /* List multiple definitions */
+extern int errno;
+extern char *sys_errlist[];
+
+extern unsigned int undefined_global_sym_count;
+
+extern bfd *output_bfd;
+
+extern struct lang_output_section_statement_struct * create_object_symbols;
+
+extern char lprefix;
+
+#ifdef __STDC__
+void lang_for_each_statement(void (*func)());
+#else /* __STDC__ */
+void lang_for_each_statement();
+#endif /* __STDC__ */
+
+extern size_t largest_section;
+ld_config_type config;
+
+extern unsigned int global_symbol_count;
+
+boolean trace_files;
+
+static void perform_relocation(input_bfd,
+ input_section,
+ data,
+ symbols)
+bfd *input_bfd;
+asection *input_section;
+void *data;
+asymbol **symbols;
+{
+ static asymbol *error_symbol = (asymbol *)NULL;
+ static unsigned int error_count = 0;
+#define MAX_ERRORS_IN_A_ROW 5
+ size_t reloc_size = get_reloc_upper_bound(input_bfd, input_section);
+
+ arelent **reloc_vector = (arelent **)ldmalloc(reloc_size);
+ arelent **parent;
+ bfd *ob = output_bfd;
+ asection *os = input_section->output_section;
+ if (config.relocateable_output == false) ob = (bfd *)NULL;
+
+ if (bfd_canonicalize_reloc(input_bfd,
+ input_section,
+ reloc_vector,
+ symbols) )
+ {
+ for (parent = reloc_vector; *parent; parent++)
+ {
+
+ bfd_reloc_status_enum_type r=
+ bfd_perform_relocation(input_bfd,
+ *parent,
+ data,
+ input_section,
+ ob);
+
+ if (r == bfd_reloc_ok) {
+ if (ob != (bfd *)NULL) {
+ /* A parital link, so keep the relocs */
+ os->orelocation[os->reloc_count] = *parent;
+ os->reloc_count++;
+ }
+ }
+ else
+ {
+ asymbol *s;
+ arelent *p = *parent;
+
+ if (ob != (bfd *)NULL) {
+ /* A parital link, so keep the relocs */
+ os->orelocation[os->reloc_count] = *parent;
+ os->reloc_count++;
+ }
+
+ if (p->sym_ptr_ptr != (asymbol **)NULL) {
+ s = *(p->sym_ptr_ptr);
+ }
+ else {
+ s = (asymbol *)NULL;
+ }
+ switch (r)
+ {
+ case bfd_reloc_undefined:
+ /* We remember the symbol, and never print more than
+ a reasonable number of them in a row */
+ if (s == error_symbol) {
+ error_count++;
+ }
+ else {
+ error_count = 0;
+ error_symbol = s;
+ }
+ if (error_count < MAX_ERRORS_IN_A_ROW) {
+ info("%C: undefined reference to `%T'\n",
+ input_bfd,
+ input_section,
+ symbols,
+ (*parent)->address,
+ s);
+ config.make_executable = false;
+ }
+ else if (error_count == MAX_ERRORS_IN_A_ROW) {
+ info("%C: more undefined references to `%T' follow\n",
+ input_bfd,
+ input_section,
+ symbols,
+ (*parent)->address,
+ s);
+ }
+ else {
+ /* Don't print any more */
+ }
+ break;
+ case bfd_reloc_dangerous:
+ info("%B: relocation may be wrong `%T'\n",
+ input_bfd,
+ s);
+ break;
+ case bfd_reloc_outofrange:
+ info("%B:%s relocation address out of range %T (%x)\n",
+ input_bfd,
+ input_section->name,
+ s,
+ p->address);
+ break;
+ case bfd_reloc_overflow:
+ info("%B:%s relocation overflow in %T reloc type %d\n",
+ input_bfd,
+ input_section->name,
+ s,
+ p->howto->type);
+ break;
+ default:
+ info("%F%B: relocation error, symbol `%T'\n",
+ input_bfd,
+ s);
+ break;
+ }
+ }
+ }
+ }
+ free((char *)reloc_vector);
+}
+
+
+
+
+
+
+void *data_area;
+
+static void
+copy_and_relocate(statement)
+lang_statement_union_type *statement;
+{
+ switch (statement->header.type) {
+ case lang_fill_statement_enum:
+ {
+#if 0
+ bfd_byte play_area[SHORT_SIZE];
+ unsigned int i;
+ bfd_putshort(output_bfd, statement->fill_statement.fill, play_area);
+ /* Write out all entire shorts */
+ for (i = 0;
+ i < statement->fill_statement.size - SHORT_SIZE + 1;
+ i+= SHORT_SIZE)
+ {
+ bfd_set_section_contents(output_bfd,
+ statement->fill_statement.output_section,
+ play_area,
+ statement->data_statement.output_offset +i,
+ SHORT_SIZE);
+
+ }
+
+ /* Now write any remaining byte */
+ if (i < statement->fill_statement.size)
+ {
+ bfd_set_section_contents(output_bfd,
+ statement->fill_statement.output_section,
+ play_area,
+ statement->data_statement.output_offset +i,
+ 1);
+
+ }
+#endif
+ }
+ break;
+ case lang_data_statement_enum:
+ {
+ bfd_vma value = statement->data_statement.value;
+ bfd_byte play_area[LONG_SIZE];
+ unsigned int size;
+ switch (statement->data_statement.type) {
+ case LONG:
+ bfd_putlong(output_bfd, value, play_area);
+ size = LONG_SIZE;
+ break;
+ case SHORT:
+ bfd_putshort(output_bfd, value, play_area);
+ size = SHORT_SIZE;
+ break;
+ case BYTE:
+ bfd_putchar(output_bfd, value, play_area);
+ size = BYTE_SIZE;
+ break;
+ }
+
+ bfd_set_section_contents(output_bfd,
+ statement->data_statement.output_section,
+ play_area,
+ statement->data_statement.output_vma,
+ size);
+
+
+
+
+ }
+ break;
+ case lang_input_section_enum:
+ {
+
+ asection *i = statement->input_section.section;
+ asection *output_section = i->output_section;
+ lang_input_statement_type *ifile = statement->input_section.ifile;
+ bfd *inbfd = ifile->the_bfd;
+ if (output_section->flags & SEC_LOAD && i->size != 0)
+ {
+ if(bfd_get_section_contents(inbfd,
+ i,
+ data_area,
+ 0L,
+ i->size) == false)
+ {
+ info("%F%B error reading section contents %E\n",
+ inbfd);
+ }
+ perform_relocation (inbfd, i, data_area, ifile->asymbols);
+
+
+ if(bfd_set_section_contents(output_bfd,
+ output_section,
+ data_area,
+ (file_ptr)i->output_offset,
+ i->size) == false)
+ {
+ info("%F%B error writing section contents of %E\n",
+ output_bfd);
+ }
+
+ }
+ }
+ break;
+
+ default:
+ /* All the other ones fall through */
+ ;
+
+ }
+}
+
+void
+write_norel()
+{
+ /* Output the text and data segments, relocating as we go. */
+ lang_for_each_statement(copy_and_relocate);
+}
+
+
+static void read_relocs(abfd, section, symbols)
+bfd *abfd;
+asection *section;
+asymbol **symbols;
+{
+ /* Work out the output section ascociated with this input section */
+ asection *output_section = section->output_section;
+
+ size_t reloc_size = get_reloc_upper_bound(abfd, section);
+ arelent **reloc_vector = (arelent **)ldmalloc(reloc_size);
+
+ if (bfd_canonicalize_reloc(abfd,
+ section,
+ reloc_vector,
+ symbols)) {
+ output_section->reloc_count += section->reloc_count;
+ }
+}
+
+
+static void
+write_rel()
+{
+ /*
+ Run through each section of each file and work work out the total
+ number of relocation records which will finally be in each output
+ section
+ */
+
+ LANG_FOR_EACH_INPUT_SECTION
+ (statement, abfd, section,
+ (read_relocs(abfd, section, statement->asymbols)));
+
+
+
+ /*
+ Now run though all the output sections and allocate the space for
+ all the relocations
+ */
+ LANG_FOR_EACH_OUTPUT_SECTION
+ (section,
+ (section->orelocation =
+ (arelent **)ldmalloc((size_t)(sizeof(arelent **)*
+ section->reloc_count)),
+ section->reloc_count = 0,
+ section->flags |= SEC_HAS_CONTENTS));
+
+
+ /*
+ Copy the data, relocating as we go
+ */
+ lang_for_each_statement(copy_and_relocate);
+}
+
+void
+ldwrite ()
+{
+ data_area = (void*) ldmalloc(largest_section);
+ if (config.relocateable_output == true)
+ {
+ write_rel();
+ }
+ else
+ {
+ write_norel();
+ }
+ free(data_area);
+ /* Output the symbol table (both globals and locals). */
+ ldsym_write ();
+
+}
+
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