aboutsummaryrefslogtreecommitdiff
path: root/ld/emultempl/spuelf.em
diff options
context:
space:
mode:
Diffstat (limited to 'ld/emultempl/spuelf.em')
-rw-r--r--ld/emultempl/spuelf.em297
1 files changed, 297 insertions, 0 deletions
diff --git a/ld/emultempl/spuelf.em b/ld/emultempl/spuelf.em
new file mode 100644
index 0000000..de6a914
--- /dev/null
+++ b/ld/emultempl/spuelf.em
@@ -0,0 +1,297 @@
+# 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
generated by cgit v1.1 at 2024-12-28 07:34:10 +0000