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|
# This shell script emits a C file. -*- C -*-
# Copyright 2006 Free Software Foundation, Inc.
#
# 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.,
# 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
#
# This file is sourced from elf32.em, and defines extra spu specific
# features.
#
cat >>e${EMULATION_NAME}.c <<EOF
#include "ldctor.h"
#include "elf32-spu.h"
/* Non-zero if no overlay processing should be done. */
static int no_overlays = 0;
/* Non-zero if we want stubs on all calls out of overlay regions. */
static int non_overlay_stubs = 0;
/* Whether to emit symbols for stubs. */
static int emit_stub_syms = 0;
/* Range of valid addresses for loadable sections. */
static bfd_vma local_store_lo = 0;
static bfd_vma local_store_hi = 0x3ffff;
extern void *_binary_builtin_ovl_mgr_start;
extern void *_binary_builtin_ovl_mgr_end;
static const struct _ovl_stream ovl_mgr_stream = {
&_binary_builtin_ovl_mgr_start,
&_binary_builtin_ovl_mgr_end
};
static asection *toe = NULL;
static int
is_spu_target (void)
{
extern const bfd_target bfd_elf32_spu_vec;
return link_info.hash->creator == &bfd_elf32_spu_vec;
}
/* Create our note section. */
static void
spu_after_open (void)
{
if (is_spu_target ()
&& !link_info.relocatable
&& link_info.input_bfds != NULL
&& !spu_elf_create_sections (output_bfd, &link_info))
einfo ("%X%P: can not create note section: %E\n");
gld${EMULATION_NAME}_after_open ();
}
/* Add section S at the end of output section OUTPUT_NAME.
Really, we should be duplicating ldlang.c map_input_to_output_sections
logic here, ie. using the linker script to find where the section
goes. That's rather a lot of code, and we don't want to run
map_input_to_output_sections again because most sections are already
mapped. So cheat, and put the section in a fixed place, ignoring any
attempt via a linker script to put .stub, .ovtab, and built-in
overlay manager code somewhere else. */
static void
spu_place_special_section (asection *s, const char *output_name)
{
lang_output_section_statement_type *os;
os = lang_output_section_find (output_name);
if (os == NULL)
{
const char *save = s->name;
s->name = output_name;
gld${EMULATION_NAME}_place_orphan (s);
s->name = save;
}
else
lang_add_section (&os->children, s, os);
s->output_section->size += s->size;
}
/* Load built-in overlay manager, and tweak overlay section alignment. */
static void
spu_elf_load_ovl_mgr (void)
{
lang_output_section_statement_type *os;
struct elf_link_hash_entry *h;
h = elf_link_hash_lookup (elf_hash_table (&link_info),
"__ovly_load", FALSE, FALSE, FALSE);
if (h != NULL
&& (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
&& h->def_regular)
{
/* User supplied __ovly_load. */
}
else
{
lang_input_statement_type *ovl_is;
ovl_is = lang_add_input_file ("builtin ovl_mgr",
lang_input_file_is_file_enum,
NULL);
if (!spu_elf_open_builtin_lib (&ovl_is->the_bfd, &ovl_mgr_stream))
einfo ("%X%P: can not open built-in overlay manager: %E\n");
else
{
asection *in;
if (!load_symbols (ovl_is, NULL))
einfo ("%X%P: can not load built-in overlay manager: %E\n");
/* Map overlay manager sections to output sections. */
for (in = ovl_is->the_bfd->sections; in != NULL; in = in->next)
if ((in->flags & (SEC_ALLOC | SEC_LOAD))
== (SEC_ALLOC | SEC_LOAD))
spu_place_special_section (in, ".text");
}
}
/* Ensure alignment of overlay sections is sufficient. */
for (os = &lang_output_section_statement.head->output_section_statement;
os != NULL;
os = os->next)
if (os->bfd_section != NULL
&& spu_elf_section_data (os->bfd_section) != NULL
&& spu_elf_section_data (os->bfd_section)->ovl_index != 0)
{
if (os->bfd_section->alignment_power < 4)
os->bfd_section->alignment_power = 4;
/* Also ensure size rounds up. */
os->block_value = 16;
}
}
/* Go find if we need to do anything special for overlays. */
static void
spu_before_allocation (void)
{
if (is_spu_target ()
&& !link_info.relocatable
&& !no_overlays)
{
/* Size the sections. This is premature, but we need to know the
rough layout so that overlays can be found. */
expld.phase = lang_mark_phase_enum;
expld.dataseg.phase = exp_dataseg_none;
one_lang_size_sections_pass (NULL, TRUE);
/* Find overlays by inspecting section vmas. */
if (spu_elf_find_overlays (output_bfd, &link_info))
{
asection *stub, *ovtab;
if (!spu_elf_size_stubs (output_bfd, &link_info, non_overlay_stubs,
&stub, &ovtab, &toe))
einfo ("%X%P: can not size overlay stubs: %E\n");
if (stub != NULL)
{
spu_place_special_section (stub, ".text");
spu_place_special_section (ovtab, ".data");
spu_place_special_section (toe, ".toe");
spu_elf_load_ovl_mgr ();
}
}
/* We must not cache anything from the preliminary sizing. */
lang_reset_memory_regions ();
}
gld${EMULATION_NAME}_before_allocation ();
}
/* Final emulation specific call. */
static void
gld${EMULATION_NAME}_finish (void)
{
int need_laying_out;
need_laying_out = bfd_elf_discard_info (output_bfd, &link_info);
gld${EMULATION_NAME}_map_segments (need_laying_out);
if (is_spu_target () && local_store_lo < local_store_hi)
{
asection *s;
s = spu_elf_check_vma (output_bfd, local_store_lo, local_store_hi);
if (s != NULL)
einfo ("%X%P: %A exceeds local store range\n", s);
}
if (toe != NULL
&& !spu_elf_build_stubs (&link_info,
emit_stub_syms || link_info.emitrelocations,
toe))
einfo ("%X%P: can not build overlay stubs: %E\n");
finish_default ();
}
EOF
# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE='
#define OPTION_SPU_PLUGIN 301
#define OPTION_SPU_NO_OVERLAYS (OPTION_SPU_PLUGIN + 1)
#define OPTION_SPU_STUB_SYMS (OPTION_SPU_NO_OVERLAYS + 1)
#define OPTION_SPU_NON_OVERLAY_STUBS (OPTION_SPU_STUB_SYMS + 1)
#define OPTION_SPU_LOCAL_STORE (OPTION_SPU_NON_OVERLAY_STUBS + 1)
'
PARSE_AND_LIST_LONGOPTS='
{ "plugin", no_argument, NULL, OPTION_SPU_PLUGIN },
{ "no-overlays", no_argument, NULL, OPTION_SPU_NO_OVERLAYS },
{ "emit-stub-syms", no_argument, NULL, OPTION_SPU_STUB_SYMS },
{ "extra-overlay-stubs", no_argument, NULL, OPTION_SPU_NON_OVERLAY_STUBS },
{ "local-store", required_argument, NULL, OPTION_SPU_LOCAL_STORE },
'
PARSE_AND_LIST_OPTIONS='
fprintf (file, _("\
--plugin Make SPU plugin.\n\
--no-overlays No overlay handling.\n\
--emit-stub-syms Add symbols on overlay call stubs.\n\
--extra-overlay-stubs Add stubs on all calls out of overlay regions.\n\
--local-store=lo:hi Valid address range.\n"
));
'
PARSE_AND_LIST_ARGS_CASES='
case OPTION_SPU_PLUGIN:
spu_elf_plugin (1);
break;
case OPTION_SPU_NO_OVERLAYS:
no_overlays = 1;
break;
case OPTION_SPU_STUB_SYMS:
emit_stub_syms = 1;
break;
case OPTION_SPU_NON_OVERLAY_STUBS:
non_overlay_stubs = 1;
break;
case OPTION_SPU_LOCAL_STORE:
{
char *end;
local_store_lo = strtoul (optarg, &end, 0);
if (*end == '\'':'\'')
{
local_store_hi = strtoul (end + 1, &end, 0);
if (*end == 0)
break;
}
einfo (_("%P%F: invalid --local-store address range `%s'\''\n"), optarg);
}
break;
'
LDEMUL_AFTER_OPEN=spu_after_open
LDEMUL_BEFORE_ALLOCATION=spu_before_allocation
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
|
