367 lines
10 KiB
Plaintext
367 lines
10 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# It does some substitutions.
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cat >em_${EMULATION_NAME}.c <<EOF
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/* An emulation for HP PA-RISC ELF linkers.
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Copyright (C) 1991, 1993 Free Software Foundation, Inc.
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Written by Steve Chamberlain steve@cygnus.com
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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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 "config.h"
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#include "ldemul.h"
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#include "ldfile.h"
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#include "ldexp.h"
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#include "ldlang.h"
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#include "ldmisc.h"
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#include "ldmain.h"
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#include "ldctor.h"
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static lang_input_statement_type *stub_file = 0;
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static lang_input_section_type *stub_input_section = NULL;
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/* FIXME. This doesn't belong here. */
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extern lang_statement_list_type file_chain;
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/* Perform some emulation specific initialization. For PA ELF we set
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up the local label prefix and the output architecture. */
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static void
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hppaelf_before_parse ()
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{
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link_info.lprefix = "L$";
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link_info.lprefix_len = 2;
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ldfile_output_architecture = bfd_arch_hppa;
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}
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/* Walk all the lang statements splicing out any padding statements from
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the list. */
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static void
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hppaelf_search_for_padding_statements (s, prev)
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lang_statement_union_type *s;
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lang_statement_union_type **prev;
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{
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lang_statement_union_type *sprev = NULL;
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for (; s != NULL; s = s->next)
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{
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switch (s->header.type)
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{
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/* We want recursively walk these sections. */
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case lang_constructors_statement_enum:
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hppaelf_search_for_padding_statements (constructor_list.head,
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&constructor_list.head);
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break;
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case lang_output_section_statement_enum:
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hppaelf_search_for_padding_statements (s->output_section_statement.
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children.head,
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&s->output_section_statement.
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children.head);
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break;
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/* Huh? What is a lang_wild_statement? */
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case lang_wild_statement_enum:
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hppaelf_search_for_padding_statements(s->wild_statement.
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children.head,
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&s->wild_statement.
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children.head);
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break;
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/* Here's what we are really looking for. Splice these out of
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the list. */
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case lang_padding_statement_enum:
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if (sprev)
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sprev->header.next = s->header.next;
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else
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**prev = *s;
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break;
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/* We don't care about these cases. */
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case lang_data_statement_enum:
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case lang_object_symbols_statement_enum:
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case lang_output_statement_enum:
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case lang_target_statement_enum:
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case lang_input_section_enum:
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case lang_input_statement_enum:
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case lang_assignment_statement_enum:
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case lang_address_statement_enum:
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break;
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default:
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abort ();
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break;
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}
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sprev = s;
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}
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}
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/* Final emulation specific call. For the PA we use this opportunity
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to determine what linker stubs are needed and generate them.
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FIXME: fast-linker work broke this in a big way. statement->asymbols
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doesn't have anything useful in it anymore. And if we slurp in
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the symbol table here and pass it down then we get lots of undefined
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symbols. Egad. */
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static void
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hppaelf_finish ()
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{
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/* Disabled until it's fixed to work with the new linker. A noteworty
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amount of code will still function without linker stubs allowing us
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to continue testing. */
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/* Only create stubs for final objects. */
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if (link_info.relocateable == false)
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{
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lang_input_statement_type *statement;
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/* Look at all the statements. */
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for (statement = (lang_input_statement_type *)file_chain.head;
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statement != NULL;
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statement = (lang_input_statement_type *)statement->next)
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{
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asection *section;
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bfd *abfd = statement->the_bfd;
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/* Look at all the sections attached to the bfd associated with
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the current statement. */
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for (section = abfd->sections;
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section != (asection *)NULL;
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section = section ->next)
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{
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int new_sym_cnt = 0;
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int i,j;
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asymbol *syms;
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/* Do the dirty work; an array of symbols for each new stub
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will be returned. */
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syms = hppa_look_for_stubs_in_section (stub_file->the_bfd,
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abfd,
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output_bfd,
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section,
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&new_sym_cnt,
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&link_info);
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if (new_sym_cnt > 0 && syms)
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{
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struct symbol_cache_entry **old_asymbols;
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old_asymbols = stub_file->asymbols;
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/* Allocate space for the updated symbols */
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stub_file->asymbols
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= xmalloc ((stub_file->symbol_count + new_sym_cnt)
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* sizeof(asymbol *));
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if (stub_file->asymbols == NULL)
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abort ();
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/* Copy the old symbols.
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FIXME. Shouldn't we free the space used by the old
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symbols here? Might there be dangling references
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made within hppa_look_for_stubs_in_section? */
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for (j = 0; j < stub_file->symbol_count; j++)
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stub_file->asymbols[j] = old_asymbols[j];
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/* Copy in the new symbols. */
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for (j = 0, i = stub_file->symbol_count;
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j < new_sym_cnt;
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j++, i++)
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stub_file->asymbols[i] = &syms[j];
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/* Finally, adjust the symbol count. */
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stub_file->symbol_count += new_sym_cnt;
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}
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}
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}
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/* Add a statement to get the linker stubs included in the output. */
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lang_add_wild (".hppa_linker_stubs",NULL);
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/* If stubs were added, then remove all the (now invalid) padding
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statements. */
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hppaelf_search_for_padding_statements (stat_ptr->head,
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&stat_ptr->head);
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}
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/* Size up the sections again. */
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lang_size_sections (stat_ptr->head, abs_output_section,
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&stat_ptr->head, 0, (bfd_vma) 0, false);
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/* FIXME: Do we need to redo the "assignments" too? */
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}
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/* Create any emulation specific output statements. FIXME? Is this
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redundant with above lang_add_wild or the code in the script? */
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static void
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hppaelf_create_output_section_statements ()
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{
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asection *stub_sec;
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asection *output_text_sec = bfd_make_section_old_way (output_bfd, ".text");
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lang_input_section_type *new_input_sec;
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/* Add a new "input file" (the linker stubs themselves). */
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stub_file = lang_add_input_file ("linker stubs",
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lang_input_file_is_fake_enum,
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NULL);
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stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
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stub_file->symbol_count = 0;
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stub_file->the_bfd->sections = 0;
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/* Add a section to the fake input file. */
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stub_sec = bfd_make_section_old_way (stub_file->the_bfd,
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".hppa_linker_stubs");
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stub_sec->output_section = output_text_sec;
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bfd_set_section_flags (stub_file->the_bfd, stub_sec,
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SEC_HAS_CONTENTS | SEC_ALLOC | SEC_CODE | SEC_RELOC);
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/* The user data of a bfd points to the input statement attached. */
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stub_file->the_bfd->usrdata = (void *)stub_file;
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stub_file->common_section = bfd_make_section(stub_file->the_bfd,"COMMON");
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new_input_sec = (lang_input_section_type *)
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stat_alloc (sizeof (lang_input_section_type));
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if (new_input_sec)
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{
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lang_output_section_statement_type *text_output_sec;
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lang_statement_union_type *stmt;
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new_input_sec->section = stub_sec;
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new_input_sec->ifile = stub_file;
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new_input_sec->header.type = lang_input_section_enum;
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new_input_sec->header.next = NULL;
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stub_input_section = new_input_sec;
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/* Find the output_section_statement for .text,
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then find the wild_statement for .hppa_linker_stubs. */
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text_output_sec = lang_output_section_find (".text");
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stmt = text_output_sec->children.head;
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while (stmt && stmt->header.type != lang_wild_statement_enum)
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stmt = stmt->header.next;
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/* Do something with the wild statement. FIXME. */
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if (stmt)
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{
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lang_wild_statement_type *wstmt = (lang_wild_statement_type *)stmt;
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lang_list_init (&wstmt->children);
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lang_statement_append (&wstmt->children,
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(lang_statement_union_type *)new_input_sec,
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&new_input_sec->header.next);
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}
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}
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}
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/* Set the output architecture and machine. */
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static void
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hppaelf_set_output_arch()
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{
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unsigned long machine = 0;
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bfd_set_arch_mach (output_bfd, ldfile_output_architecture, machine);
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}
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/* The script itself gets inserted here. */
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static char *
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hppaelf_get_script(isfile)
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int *isfile;
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EOF
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if test -n "$COMPILE_IN"
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then
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# Scripts compiled in.
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# sed commands to quote an ld script as a C string.
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sc='s/["\\]/\\&/g
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s/$/\\n\\/
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1s/^/"/
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$s/$/n"/
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'
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cat >>em_${EMULATION_NAME}.c <<EOF
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{
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*isfile = 0;
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if (link_info.relocateable == true && config.build_constructors == true)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
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else if (link_info.relocateable == true)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
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else if (!config.text_read_only)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
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else if (!config.magic_demand_paged)
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return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
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else
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return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
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}
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EOF
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else
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# Scripts read from the filesystem.
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cat >>em_${EMULATION_NAME}.c <<EOF
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{
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*isfile = 1;
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if (link_info.relocateable == true && config.build_constructors == true)
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return "ldscripts/${EMULATION_NAME}.xu";
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else if (link_info.relocateable == true)
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return "ldscripts/${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/${EMULATION_NAME}.x";
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}
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EOF
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fi
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cat >>em_${EMULATION_NAME}.c <<EOF
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struct ld_emulation_xfer_struct ld_hppaelf_emulation =
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{
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hppaelf_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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after_allocation_default,
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hppaelf_set_output_arch,
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ldemul_default_target,
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before_allocation_default,
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hppaelf_get_script,
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"hppaelf",
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"elf32-hppa",
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hppaelf_finish,
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hppaelf_create_output_section_statements
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};
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EOF
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