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Add support for ELF shared libraries.

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* ld.h (ld_config_type): Add field dynamic_link.
	* ldmain.c (main): Initialize config.dynamic_link to false.  Warn
	on attempts to use -r with -relax, -call_shared or -s.
	* lexsup.c (longopts): Separate OPTION_CALL_SHARED from
	OPTION_NON_SHARED.  Add OPTION_IGNORE.  Adjust macro values
	accordingly.  Add "dy" and "non_shared" options.  Change "Qy" to
	OPTION_IGNORE for now.  Handle OPTION_CALL_SHARED and
	OPTION_NON_SHARED by setting dynamic_link field accordingly.
	Handle OPTION_IGNORE by ignoring it.  Clear dynamic_link field for
	-r and -Ur.
	* ldfile.c (ldfile_open_file): If config.dynamic_link is true, try
	opening a file with a .so extension first.
	* emultempl/elf32.em: New file.
	* emulparams/elf32_sparc.sh (TEXT_START_ADDR): Change to 0x10000.
	(NONPAGED_TEXT_START_ADDR): Likewise.
	(TEMPLATE_NAME): Define as elf32.
	(DATA_PLT): Define.
	* emulparams/elf_i386.sh (TEMPLATE_NAME): Define as elf32.
	* scripttempl/elf.sc: Add placement for new dynamic sections.
	Don't use CREATE_OBJECT_SYMBOLS.  Define _etext, _edata and _end
	outside of any section.  Don't use ALIGN(8); just let one section
	VMA follow another.  Put .dynbss in .bss.  Don't mention debugging
	sections; they'll be handled correctly anyhow.
	* Makefile.in (eelf_i386.c): Depend upon elf32.em, not generic.em.
This commit is contained in:
Ian Lance Taylor
1994-05-19 18:25:10 +00:00
parent 013dec1ad9
commit 2a9fa50cd8
9 changed files with 410 additions and 170 deletions
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54
ld/ldfile.c
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@@ -1,5 +1,4 @@
/* Copyright (C) 1991 Free Software Foundation, Inc.
/* Copyright (C) 1991, 92, 93, 94 Free Software Foundation, Inc.
This file is part of GLD, the Gnu Linker.
@@ -32,6 +31,7 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "ldlang.h"
#include "ldfile.h"
#include "ldmain.h"
#include "ldgram.h"
#include "ldlex.h"
#include <ctype.h>
@@ -89,7 +89,7 @@ ldfile_add_library_path(name)
char *name;
{
search_dirs_type *new =
(search_dirs_type *)ldmalloc((bfd_size_type)(sizeof(search_dirs_type)));
(search_dirs_type *)xmalloc((bfd_size_type)(sizeof(search_dirs_type)));
new->name = name;
new->next = (search_dirs_type*)NULL;
*search_tail_ptr = new;
@@ -160,41 +160,42 @@ open_a(arch, entry, lib, suffix)
void
ldfile_open_file (entry)
lang_input_statement_type *entry;
lang_input_statement_type *entry;
{
if (entry->superfile)
if (entry->superfile != NULL)
ldfile_open_file (entry->superfile);
if (entry->search_dirs_flag)
if (! entry->search_dirs_flag)
entry->the_bfd = cached_bfd_openr (entry->filename, entry);
else
{
search_arch_type *arch;
/* Try to open <filename><suffix> or lib<filename><suffix>.a */
for (arch = search_arch_head;
arch != (search_arch_type *)NULL;
arch = arch->next) {
if (open_a(arch->name,entry,"lib",".a") != (bfd *)NULL) {
return;
}
arch != (search_arch_type *) NULL;
arch = arch->next)
{
if (config.dynamic_link)
{
/* FIXME: Perhaps we will sometimes want something other
than .so. */
if (open_a (arch->name, entry, "lib", ".so") != (bfd *) NULL)
return;
}
if (open_a (arch->name, entry, "lib", ".a") != (bfd *) NULL)
return;
#ifdef VMS
if (open_a(arch->name,entry,":lib",".a") != (bfd *)NULL) {
return;
}
if (open_a (arch->name, entry, ":lib", ".a") != (bfd *) NULL)
return;
#endif
}
}
}
else {
entry->the_bfd = cached_bfd_openr (entry->filename, entry);
}
if (!entry->the_bfd)
if (entry->the_bfd == NULL)
einfo("%F%P: cannot open %s: %E\n", entry->local_sym_name);
}
/* Try to open NAME; if that fails, try NAME with EXTEN appended to it. */
static FILE *
@@ -264,6 +265,7 @@ char *name;
ldlex_input_stack = ldfile_find_command_file(name, "");
if (ldlex_input_stack == (FILE *)NULL) {
bfd_set_error (bfd_error_system_call);
einfo("%P%F: cannot open linker script file %s: %E\n",name);
}
lex_push_file(ldlex_input_stack, name);
@@ -316,7 +318,7 @@ ldfile_add_arch(name)
char *name;
{
search_arch_type *new =
(search_arch_type *)ldmalloc((bfd_size_type)(sizeof(search_arch_type)));
(search_arch_type *)xmalloc((bfd_size_type)(sizeof(search_arch_type)));
if (*name != '\0') {
@@ -343,7 +345,7 @@ ldfile_add_arch (in_name)
{
char *name = buystring(in_name);
search_arch_type *new =
(search_arch_type *)ldmalloc((bfd_size_type)(sizeof(search_arch_type)));
(search_arch_type *)xmalloc((bfd_size_type)(sizeof(search_arch_type)));
ldfile_output_machine_name = in_name;