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