467 lines
14 KiB
Text
467 lines
14 KiB
Text
# This shell script emits a C file. -*- C -*-
|
|
# It does some substitutions.
|
|
cat >e${EMULATION_NAME}.c <<EOF
|
|
/* This file is is generated by a shell script. DO NOT EDIT! */
|
|
|
|
/* 32 bit ELF emulation code for ${EMULATION_NAME}
|
|
Copyright (C) 1991, 1993, 1994, 1995 Free Software Foundation, Inc.
|
|
Written by Steve Chamberlain <sac@cygnus.com>
|
|
ELF support by Ian Lance Taylor <ian@cygnus.com>
|
|
|
|
This file is part of GLD, the Gnu Linker.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#define TARGET_IS_${EMULATION_NAME}
|
|
|
|
#include "bfd.h"
|
|
#include "sysdep.h"
|
|
|
|
#include <ctype.h>
|
|
|
|
#include "bfdlink.h"
|
|
|
|
#include "ld.h"
|
|
#include "config.h"
|
|
#include "ldmain.h"
|
|
#include "ldemul.h"
|
|
#include "ldfile.h"
|
|
#include "ldmisc.h"
|
|
#include "ldexp.h"
|
|
#include "ldlang.h"
|
|
#include "ldgram.h"
|
|
|
|
static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
|
|
static boolean gld${EMULATION_NAME}_open_dynamic_archive
|
|
PARAMS ((const char *, lang_input_statement_type *));
|
|
static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
|
|
static void gld${EMULATION_NAME}_find_statement_assignment
|
|
PARAMS ((lang_statement_union_type *));
|
|
static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
|
|
static boolean gld${EMULATION_NAME}_place_orphan
|
|
PARAMS ((lang_input_statement_type *, asection *));
|
|
static void gld${EMULATION_NAME}_place_section
|
|
PARAMS ((lang_statement_union_type *));
|
|
static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_before_parse()
|
|
{
|
|
ldfile_output_architecture = bfd_arch_${ARCH};
|
|
config.dynamic_link = ${DYNAMIC_LINK-true};
|
|
}
|
|
|
|
/* Try to open a dynamic archive. This is where we know that ELF
|
|
dynamic libraries have an extension of .so. */
|
|
|
|
static boolean
|
|
gld${EMULATION_NAME}_open_dynamic_archive (arch, entry)
|
|
const char *arch;
|
|
lang_input_statement_type *entry;
|
|
{
|
|
const char *filename;
|
|
|
|
filename = entry->filename;
|
|
|
|
if (! ldfile_open_file_search (arch, entry, "lib", ".so"))
|
|
return false;
|
|
|
|
/* We have found a dynamic object to include in the link. The ELF
|
|
backend linker will create a DT_NEEDED entry in the .dynamic
|
|
section naming this file. If this file includes a DT_SONAME
|
|
entry, it will be used. Otherwise, the ELF linker will just use
|
|
the name of the file. For an archive found by searching, like
|
|
this one, the DT_NEEDED entry should consist of just the name of
|
|
the file, without the path information used to find it. Note
|
|
that we only need to do this if we have a dynamic object; an
|
|
archive will never be referenced by a DT_NEEDED entry.
|
|
|
|
FIXME: This approach--using bfd_elf_set_dt_needed_name--is not
|
|
very pretty. I haven't been able to think of anything that is
|
|
pretty, though. */
|
|
if (bfd_check_format (entry->the_bfd, bfd_object)
|
|
&& (entry->the_bfd->flags & DYNAMIC) != 0)
|
|
{
|
|
char *needed_name;
|
|
|
|
ASSERT (entry->is_archive && entry->search_dirs_flag);
|
|
needed_name = (char *) xmalloc (strlen (filename)
|
|
+ strlen (arch)
|
|
+ sizeof "lib.so");
|
|
sprintf (needed_name, "lib%s%s.so", filename, arch);
|
|
bfd_elf_set_dt_needed_name (entry->the_bfd, needed_name);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* This is called after the sections have been attached to output
|
|
sections, but before any sizes or addresses have been set. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_before_allocation ()
|
|
{
|
|
asection *sinterp;
|
|
|
|
/* If we are going to make any variable assignments, we need to let
|
|
the ELF backend know about them in case the variables are
|
|
referred to by dynamic objects. */
|
|
lang_for_each_statement (gld${EMULATION_NAME}_find_statement_assignment);
|
|
|
|
/* Let the ELF backend work out the sizes of any sections required
|
|
by dynamic linking. */
|
|
if (! bfd_elf32_size_dynamic_sections (output_bfd,
|
|
command_line.soname,
|
|
command_line.rpath,
|
|
command_line.export_dynamic,
|
|
&link_info,
|
|
&sinterp))
|
|
einfo ("%P%F: failed to set dynamic section sizes: %E\n");
|
|
|
|
/* Let the user override the dynamic linker we are using. */
|
|
if (command_line.interpreter != NULL
|
|
&& sinterp != NULL)
|
|
{
|
|
sinterp->contents = (bfd_byte *) command_line.interpreter;
|
|
sinterp->_raw_size = strlen (command_line.interpreter) + 1;
|
|
}
|
|
|
|
/* Look for any sections named .gnu.warning. As a GNU extensions,
|
|
we treat such sections as containing warning messages. We print
|
|
out the warning message, and then zero out the section size so
|
|
that it does not get copied into the output file. */
|
|
|
|
{
|
|
LANG_FOR_EACH_INPUT_STATEMENT (is)
|
|
{
|
|
asection *s;
|
|
bfd_size_type sz;
|
|
char *msg;
|
|
boolean ret;
|
|
|
|
if (is->just_syms_flag)
|
|
continue;
|
|
|
|
s = bfd_get_section_by_name (is->the_bfd, ".gnu.warning");
|
|
if (s == NULL)
|
|
continue;
|
|
|
|
sz = bfd_section_size (is->the_bfd, s);
|
|
msg = xmalloc ((size_t) sz + 1);
|
|
if (! bfd_get_section_contents (is->the_bfd, s, msg, (file_ptr) 0, sz))
|
|
einfo ("%F%B: Can't read contents of section .gnu.warning: %E\n",
|
|
is->the_bfd);
|
|
msg[sz] = '\0';
|
|
ret = link_info.callbacks->warning (&link_info, msg);
|
|
ASSERT (ret);
|
|
free (msg);
|
|
|
|
/* Clobber the section size, so that we don't waste copying the
|
|
warning into the output file. */
|
|
s->_raw_size = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* This is called by the before_allocation routine via
|
|
lang_for_each_statement. It locates any assignment statements, and
|
|
tells the ELF backend about them, in case they are assignments to
|
|
symbols which are referred to by dynamic objects. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_find_statement_assignment (s)
|
|
lang_statement_union_type *s;
|
|
{
|
|
if (s->header.type == lang_assignment_statement_enum)
|
|
gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
|
|
}
|
|
|
|
/* Look through an expression for an assignment statement. */
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp)
|
|
etree_type *exp;
|
|
{
|
|
switch (exp->type.node_class)
|
|
{
|
|
case etree_assign:
|
|
if (strcmp (exp->assign.dst, ".") != 0)
|
|
{
|
|
if (! bfd_elf32_record_link_assignment (output_bfd, &link_info,
|
|
exp->assign.dst))
|
|
einfo ("%P%F: failed to record assignment to %s: %E\n",
|
|
exp->assign.dst);
|
|
}
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
|
|
break;
|
|
|
|
case etree_binary:
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
|
|
break;
|
|
|
|
case etree_trinary:
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
|
|
break;
|
|
|
|
case etree_unary:
|
|
gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Place an orphan section. We use this to put random SHF_ALLOC
|
|
sections in the right segment. */
|
|
|
|
static asection *hold_section;
|
|
static lang_output_section_statement_type *hold_use;
|
|
static lang_output_section_statement_type *hold_text;
|
|
static lang_output_section_statement_type *hold_data;
|
|
static lang_output_section_statement_type *hold_bss;
|
|
|
|
/*ARGSUSED*/
|
|
static boolean
|
|
gld${EMULATION_NAME}_place_orphan (file, s)
|
|
lang_input_statement_type *file;
|
|
asection *s;
|
|
{
|
|
lang_output_section_statement_type *place;
|
|
asection *snew, **pps;
|
|
lang_statement_list_type *old;
|
|
lang_statement_list_type add;
|
|
etree_type *address;
|
|
const char *secname, *ps;
|
|
lang_output_section_statement_type *os;
|
|
|
|
if ((s->flags & SEC_ALLOC) == 0)
|
|
return false;
|
|
|
|
/* Look through the script to see where to place this section. */
|
|
hold_section = s;
|
|
hold_use = NULL;
|
|
lang_for_each_statement (gld${EMULATION_NAME}_place_section);
|
|
|
|
if (hold_use != NULL)
|
|
{
|
|
/* We have already placed a section with this name. */
|
|
wild_doit (&hold_use->children, s, hold_use, file);
|
|
return true;
|
|
}
|
|
|
|
/* Decide which segment the section should go in based on the
|
|
section flags. */
|
|
place = NULL;
|
|
if ((s->flags & SEC_HAS_CONTENTS) == 0
|
|
&& hold_bss != NULL)
|
|
place = hold_bss;
|
|
else if ((s->flags & SEC_READONLY) == 0
|
|
&& hold_data != NULL)
|
|
place = hold_data;
|
|
else if ((s->flags & SEC_READONLY) != 0
|
|
&& hold_text != NULL)
|
|
place = hold_text;
|
|
if (place == NULL)
|
|
return false;
|
|
|
|
secname = bfd_get_section_name (s->owner, s);
|
|
|
|
/* When generating an object which is to be dynamically linked, we
|
|
do not support orphaned reloc sections. This is because all the
|
|
reloc sections must be contiguous in order to generate correct
|
|
DT_REL entries. When this case arises, you can just add the
|
|
appropriate reloc sections to the linker script. Note that the
|
|
.rel.plt section must always be the last reloc section. FIXME:
|
|
This should simply be handled correctly here. */
|
|
ASSERT (strncmp (secname, ".rel", 4) != 0
|
|
|| bfd_get_section_by_name (output_bfd, ".dynamic") == NULL);
|
|
|
|
/* Create the section in the output file, and put it in the right
|
|
place. This shuffling to make the output file look neater, and
|
|
also means that the BFD backend does not have to sort the
|
|
sections in order by address. */
|
|
snew = bfd_make_section (output_bfd, secname);
|
|
if (snew == NULL)
|
|
einfo ("%P%F: output format %s cannot represent section called %s\n",
|
|
output_bfd->xvec->name, secname);
|
|
for (pps = &output_bfd->sections; *pps != snew; pps = &(*pps)->next)
|
|
;
|
|
*pps = snew->next;
|
|
snew->next = place->bfd_section->next;
|
|
place->bfd_section->next = snew;
|
|
|
|
/* Start building a list of statements for this section. */
|
|
old = stat_ptr;
|
|
stat_ptr = &add;
|
|
lang_list_init (stat_ptr);
|
|
|
|
/* If the name of the section is representable in C, then create
|
|
symbols to mark the start and the end of the section. */
|
|
for (ps = secname; *ps != '\0'; ps++)
|
|
if (! isalnum (*ps) && *ps != '_')
|
|
break;
|
|
if (*ps == '\0' && config.build_constructors)
|
|
{
|
|
char *symname;
|
|
|
|
symname = (char *) xmalloc (ps - secname + sizeof "__start_");
|
|
sprintf (symname, "__start_%s", secname);
|
|
lang_add_assignment (exp_assop ('=', symname,
|
|
exp_nameop (NAME, ".")));
|
|
}
|
|
|
|
if (! link_info.relocateable)
|
|
address = NULL;
|
|
else
|
|
address = exp_intop ((bfd_vma) 0);
|
|
|
|
lang_enter_output_section_statement (secname, address, 0,
|
|
(bfd_vma) 0,
|
|
(etree_type *) NULL,
|
|
(etree_type *) NULL,
|
|
(etree_type *) NULL);
|
|
|
|
os = lang_output_section_statement_lookup (secname);
|
|
wild_doit (&os->children, s, os, file);
|
|
|
|
lang_leave_output_section_statement ((bfd_vma) 0, "*default*");
|
|
stat_ptr = &add;
|
|
|
|
if (*ps == '\0' && config.build_constructors)
|
|
{
|
|
char *symname;
|
|
|
|
symname = (char *) xmalloc (ps - secname + sizeof "__stop_");
|
|
sprintf (symname, "__stop_%s", secname);
|
|
lang_add_assignment (exp_assop ('=', symname,
|
|
exp_nameop (NAME, ".")));
|
|
}
|
|
|
|
/* Now stick the new statement list right after PLACE. */
|
|
*add.tail = place->header.next;
|
|
place->header.next = add.head;
|
|
|
|
stat_ptr = old;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
gld${EMULATION_NAME}_place_section (s)
|
|
lang_statement_union_type *s;
|
|
{
|
|
lang_output_section_statement_type *os;
|
|
|
|
if (s->header.type != lang_output_section_statement_enum)
|
|
return;
|
|
|
|
os = &s->output_section_statement;
|
|
|
|
if (strcmp (os->name, hold_section->name) == 0)
|
|
hold_use = os;
|
|
|
|
if (strcmp (os->name, ".text") == 0)
|
|
hold_text = os;
|
|
else if (strcmp (os->name, ".data") == 0)
|
|
hold_data = os;
|
|
else if (strcmp (os->name, ".bss") == 0)
|
|
hold_bss = os;
|
|
}
|
|
|
|
static char *
|
|
gld${EMULATION_NAME}_get_script(isfile)
|
|
int *isfile;
|
|
EOF
|
|
|
|
if test -n "$COMPILE_IN"
|
|
then
|
|
# Scripts compiled in.
|
|
|
|
# sed commands to quote an ld script as a C string.
|
|
sc='s/["\\]/\\&/g
|
|
s/$/\\n\\/
|
|
1s/^/"/
|
|
$s/$/n"/
|
|
'
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
{
|
|
*isfile = 0;
|
|
|
|
if (link_info.relocateable == true && config.build_constructors == true)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xu`;
|
|
else if (link_info.relocateable == true)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xr`;
|
|
else if (!config.text_read_only)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xbn`;
|
|
else if (!config.magic_demand_paged)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xn`;
|
|
else if (link_info.shared)
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.xs`;
|
|
else
|
|
return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
|
|
}
|
|
EOF
|
|
|
|
else
|
|
# Scripts read from the filesystem.
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
{
|
|
*isfile = 1;
|
|
|
|
if (link_info.relocateable == true && config.build_constructors == true)
|
|
return "ldscripts/${EMULATION_NAME}.xu";
|
|
else if (link_info.relocateable == true)
|
|
return "ldscripts/${EMULATION_NAME}.xr";
|
|
else if (!config.text_read_only)
|
|
return "ldscripts/${EMULATION_NAME}.xbn";
|
|
else if (!config.magic_demand_paged)
|
|
return "ldscripts/${EMULATION_NAME}.xn";
|
|
else if (link_info.shared)
|
|
return "ldscripts/${EMULATION_NAME}.xs";
|
|
else
|
|
return "ldscripts/${EMULATION_NAME}.x";
|
|
}
|
|
EOF
|
|
|
|
fi
|
|
|
|
cat >>e${EMULATION_NAME}.c <<EOF
|
|
|
|
struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
|
|
{
|
|
gld${EMULATION_NAME}_before_parse,
|
|
syslib_default,
|
|
hll_default,
|
|
after_parse_default,
|
|
after_open_default,
|
|
after_allocation_default,
|
|
set_output_arch_default,
|
|
ldemul_default_target,
|
|
gld${EMULATION_NAME}_before_allocation,
|
|
gld${EMULATION_NAME}_get_script,
|
|
"${EMULATION_NAME}",
|
|
"${OUTPUT_FORMAT}",
|
|
NULL,
|
|
NULL,
|
|
gld${EMULATION_NAME}_open_dynamic_archive,
|
|
gld${EMULATION_NAME}_place_orphan
|
|
};
|
|
EOF
|