# This shell script emits a C file. -*- C -*-
-# It does some substitutions.
-cat >em_${EMULATION_NAME}.c <<EOF
-/* An emulation for HP PA-RISC ELF linkers.
- Copyright (C) 1991, 1993 Free Software Foundation, Inc.
- Written by Steve Chamberlain steve@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. */
-
-#include "bfd.h"
-#include "sysdep.h"
-#include "bfdlink.h"
-
-#include "ld.h"
-#include "config.h"
-#include "ldemul.h"
-#include "ldfile.h"
-#include "ldexp.h"
-#include "ldlang.h"
-#include "ldmisc.h"
-#include "ldmain.h"
+# Copyright (C) 1991-2021 Free Software Foundation, Inc.
+#
+# This file is part of the GNU Binutils.
+#
+# 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 3 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 elf.em, and defines extra hppa-elf
+# specific routines.
+#
+fragment <<EOF
+
#include "ldctor.h"
+#include "elf32-hppa.h"
+
+
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
-static lang_input_statement_type *stub_file = 0;
-static lang_input_section_type *stub_input_section = NULL;
+/* Type of import/export stubs to build. For a single sub-space model,
+ we can build smaller import stubs and there is no need for export
+ stubs. */
+static int multi_subspace = 0;
-/* FIXME. This doesn't belong here. */
-extern asymbol *hppa_look_for_stubs_in_section ();
-
-/* Perform some emulation specific initialization. For PA ELF we set
- up the local label prefix and the output architecture. */
+/* Whether we need to call hppa_layout_sections_again. */
+static int need_laying_out = 0;
+
+/* Maximum size of a group of input sections that can be handled by
+ one stub section. A value of +/-1 indicates the bfd back-end
+ should use a suitable default size. */
+static bfd_signed_vma group_size = 1;
+
+/* Stops the linker merging .text sections on a relocatable link,
+ and adds millicode library to the list of input files. */
static void
-hppaelf_before_parse ()
+hppaelf_after_parse (void)
{
- link_info.lprefix = "L$";
- link_info.lprefix_len = 2;
+ if (bfd_link_relocatable (&link_info))
+ lang_add_unique (".text");
+
+ /* Enable this once we split millicode stuff from libgcc:
+ lang_add_input_file ("milli",
+ lang_input_file_is_l_enum,
+ NULL);
+ */
- ldfile_output_architecture = bfd_arch_hppa;
+ ldelf_after_parse ();
}
-/* Walk all the lang statements splicing out any padding statements from
- the list. */
+/* This is called before the input files are opened. We create a new
+ fake input file to hold the stub sections. */
static void
-hppaelf_search_for_padding_statements (s, prev)
- lang_statement_union_type *s;
- lang_statement_union_type **prev;
+hppaelf_create_output_section_statements (void)
{
- lang_statement_union_type *sprev = NULL;
- for (; s != NULL; s = s->next)
+ if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
+ && (elf_object_id (link_info.output_bfd) == HPPA32_ELF_DATA
+ || elf_object_id (link_info.output_bfd) == HPPA64_ELF_DATA)))
+ return;
+
+ stub_file = lang_add_input_file ("linker stubs",
+ lang_input_file_is_fake_enum,
+ NULL);
+ stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
+ if (stub_file->the_bfd == NULL
+ || ! bfd_set_arch_mach (stub_file->the_bfd,
+ bfd_get_arch (link_info.output_bfd),
+ bfd_get_mach (link_info.output_bfd)))
{
- switch (s->header.type)
- {
+ einfo (_("%F%P: can not create BFD: %E\n"));
+ return;
+ }
+
+ stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
+ ldlang_add_file (stub_file);
+ elf32_hppa_init_stub_bfd (stub_file->the_bfd, &link_info);
+}
+
+
+struct hook_stub_info
+{
+ lang_statement_list_type add;
+ asection *input_section;
+};
+
+/* Traverse the linker tree to find the spot where the stub goes. */
+
+static bfd_boolean
+hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
+{
+ lang_statement_union_type *l;
+ bfd_boolean ret;
- /* We want recursively walk these sections. */
+ for (; (l = *lp) != NULL; lp = &l->header.next)
+ {
+ switch (l->header.type)
+ {
case lang_constructors_statement_enum:
- hppaelf_search_for_padding_statements (constructor_list.head,
- &constructor_list.head);
+ ret = hook_in_stub (info, &constructor_list.head);
+ if (ret)
+ return ret;
break;
case lang_output_section_statement_enum:
- hppaelf_search_for_padding_statements (s->output_section_statement.
- children.head,
- &s->output_section_statement.
- children.head);
+ ret = hook_in_stub (info,
+ &l->output_section_statement.children.head);
+ if (ret)
+ return ret;
break;
- /* Huh? What is a lang_wild_statement? */
case lang_wild_statement_enum:
- hppaelf_search_for_padding_statements(s->wild_statement.
- children.head,
- &s->wild_statement.
- children.head);
+ ret = hook_in_stub (info, &l->wild_statement.children.head);
+ if (ret)
+ return ret;
break;
- /* Here's what we are really looking for. Splice these out of
- the list. */
- case lang_padding_statement_enum:
- if (sprev)
- sprev->header.next = s->header.next;
- else
- **prev = *s;
+ case lang_group_statement_enum:
+ ret = hook_in_stub (info, &l->group_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_input_section_enum:
+ if (l->input_section.section == info->input_section)
+ {
+ /* We've found our section. Insert the stub immediately
+ before its associated input section. */
+ *lp = info->add.head;
+ *(info->add.tail) = l;
+ return TRUE;
+ }
break;
- /* We don't care about these cases. */
case lang_data_statement_enum:
+ case lang_reloc_statement_enum:
case lang_object_symbols_statement_enum:
case lang_output_statement_enum:
case lang_target_statement_enum:
- case lang_input_section_enum:
case lang_input_statement_enum:
case lang_assignment_statement_enum:
+ case lang_padding_statement_enum:
case lang_address_statement_enum:
+ case lang_fill_statement_enum:
break;
default:
- abort ();
+ FAIL ();
break;
}
- sprev = s;
}
+ return FALSE;
}
-/* Final emulation specific call. For the PA we use this opportunity
- to determine what linker stubs are needed and generate them.
-
- FIXME: fast-linker work broke this in a big way. statement->asymbols
- doesn't have anything useful in it anymore. And if we slurp in
- the symbol table here and pass it down then we get lots of undefined
- symbols. Egad. */
-static void
-hppaelf_finish ()
-{
+/* Call-back for elf32_hppa_size_stubs. */
- /* Disabled until it's fixed to work with the new linker. A noteworty
- amount of code will still function without linker stubs allowing us
- to continue testing. */
+/* Create a new stub section, and arrange for it to be linked
+ immediately before INPUT_SECTION. */
-#if 0
- /* Only create stubs for final objects. */
- if (link_info.relocateable == false)
- {
- lang_input_statement_type *statement;
-
- /* Look at all the statements. */
- for (statement = (lang_input_statement_type *)file_chain.head;
- statement != NULL;
- statement = (lang_input_statement_type *)statement->next)
- {
- asection *section;
- bfd *abfd = statement->the_bfd;
-
- /* Look at all the sections attached to the bfd associated with
- the current statement. */
- for (section = abfd->sections;
- section != (asection *)NULL;
- section = section ->next)
- {
- int new_sym_cnt = 0;
- int i,j;
- asymbol *syms;
-
- /* Do the dirty work; an array of symbols for each new stub
- will be returned. */
- syms = hppa_look_for_stubs_in_section (stub_file->the_bfd,
- abfd,
- output_bfd,
- section,
- statement->asymbols,
- &new_sym_cnt,
- &link_info);
-
- if (new_sym_cnt > 0 && syms)
- {
- struct symbol_cache_entry **old_asymbols;
-
- old_asymbols = stub_file->asymbols;
-
- /* Allocate space for the updated symbols */
- stub_file->asymbols
- = xmalloc ((stub_file->symbol_count + new_sym_cnt)
- * sizeof(asymbol *));
- if (stub_file->asymbols == NULL)
- abort ();
-
- /* Copy the old symbols.
-
- FIXME. Shouldn't we free the space used by the old
- symbols here? Might there be dangling references
- made within hppa_look_for_stubs_in_section? */
- for (j = 0; j < stub_file->symbol_count; j++)
- stub_file->asymbols[j] = old_asymbols[j];
-
- /* Copy in the new symbols. */
- for (j = 0, i = stub_file->symbol_count;
- j < new_sym_cnt;
- j++, i++)
- stub_file->asymbols[i] = &syms[j];
-
- /* Finally, adjust the symbol count. */
- stub_file->symbol_count += new_sym_cnt;
- }
- }
- }
-
- /* Add a statement to get the linker stubs included in the output. */
- lang_add_wild (".hppa_linker_stubs",NULL);
-
- /* If stubs were added, then remove all the (now invalid) padding
- statements. */
- hppaelf_search_for_padding_statements (stat_ptr->head,
- &stat_ptr->head);
- }
-
- /* Size up the sections again. */
- lang_size_sections (stat_ptr->head, abs_output_section,
- &stat_ptr->head, 0, (bfd_vma) 0, false);
-
- /* FIXME: Do we need to redo the "assignments" too? */
-#endif
+static asection *
+hppaelf_add_stub_section (const char *stub_sec_name, asection *input_section)
+{
+ asection *stub_sec;
+ flagword flags;
+ asection *output_section;
+ lang_output_section_statement_type *os;
+ struct hook_stub_info info;
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+ | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
+ stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
+ stub_sec_name, flags);
+ if (stub_sec == NULL)
+ goto err_ret;
+
+ output_section = input_section->output_section;
+ os = lang_output_section_get (output_section);
+
+ info.input_section = input_section;
+ lang_list_init (&info.add);
+ lang_add_section (&info.add, stub_sec, NULL, os);
+
+ if (info.add.head == NULL)
+ goto err_ret;
+
+ if (hook_in_stub (&info, &os->children.head))
+ return stub_sec;
+
+ err_ret:
+ einfo (_("%X%P: can not make stub section: %E\n"));
+ return NULL;
}
-/* Create any emulation specific output statements. FIXME? Is this
- redundant with above lang_add_wild or the code in the script? */
+
+/* Another call-back for elf32_hppa_size_stubs. */
static void
-hppaelf_create_output_section_statements ()
+hppaelf_layout_sections_again (void)
{
- asection *stub_sec;
- asection *output_text_sec = bfd_make_section_old_way (output_bfd, ".text");
- lang_input_section_type *new_input_sec;
+ /* If we have changed sizes of the stub sections, then we need
+ to recalculate all the section offsets. This may mean we need to
+ add even more stubs. */
+ ldelf_map_segments (TRUE);
+ need_laying_out = -1;
+}
- /* Add a new "input file" (the linker stubs themselves). */
- stub_file = lang_add_input_file ("linker stubs",
- lang_input_file_is_fake_enum,
- NULL);
- stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
- stub_file->symbol_count = 0;
- stub_file->the_bfd->sections = 0;
-
- /* Add a section to the fake input file. */
- stub_sec = bfd_make_section_old_way (stub_file->the_bfd,
- ".hppa_linker_stubs");
- stub_sec->output_section = output_text_sec;
- bfd_set_section_flags (stub_file->the_bfd, stub_sec,
- SEC_HAS_CONTENTS | SEC_ALLOC | SEC_CODE | SEC_RELOC);
-
- /* The user data of a bfd points to the input statement attached. */
- stub_file->the_bfd->usrdata = (void *)stub_file;
- stub_file->common_section = bfd_make_section(stub_file->the_bfd,"COMMON");
-
- new_input_sec = (lang_input_section_type *)
- stat_alloc (sizeof (lang_input_section_type));
-
- if (new_input_sec)
+
+static void
+build_section_lists (lang_statement_union_type *statement)
+{
+ if (statement->header.type == lang_input_section_enum)
{
- lang_output_section_statement_type *text_output_sec;
- lang_statement_union_type *stmt;
-
- new_input_sec->section = stub_sec;
- new_input_sec->ifile = stub_file;
- new_input_sec->header.type = lang_input_section_enum;
- new_input_sec->header.next = NULL;
-
- stub_input_section = new_input_sec;
-
- /* Find the output_section_statement for .text,
- then find the wild_statement for .hppa_linker_stubs. */
- text_output_sec = lang_output_section_find (".text");
-
- stmt = text_output_sec->children.head;
-
- while (stmt && stmt->header.type != lang_wild_statement_enum)
- stmt = stmt->header.next;
-
- /* Do something with the wild statement. FIXME. */
- if (stmt)
- {
- lang_wild_statement_type *wstmt = (lang_wild_statement_type *)stmt;
- lang_list_init (&wstmt->children);
- lang_statement_append (&wstmt->children,
- (lang_statement_union_type *)new_input_sec,
- &new_input_sec->header.next);
- }
+ asection *i = statement->input_section.section;
+
+ if (i->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
+ && (i->flags & SEC_EXCLUDE) == 0
+ && i->output_section != NULL
+ && i->output_section->owner == link_info.output_bfd)
+ {
+ elf32_hppa_next_input_section (&link_info, i);
+ }
}
}
-/* Set the output architecture and machine. */
+
+/* For the PA we use this opportunity to size and build linker stubs. */
static void
-hppaelf_set_output_arch()
+gld${EMULATION_NAME}_after_allocation (void)
{
- unsigned long machine = 0;
+ int ret;
+
+ /* bfd_elf_discard_info just plays with data and debugging sections,
+ ie. doesn't affect code size, so we can delay resizing the
+ sections. It's likely we'll resize everything in the process of
+ adding stubs. */
+ ret = bfd_elf_discard_info (link_info.output_bfd, &link_info);
+ if (ret < 0)
+ {
+ einfo (_("%X%P: .eh_frame/.stab edit: %E\n"));
+ return;
+ }
+ else if (ret > 0)
+ need_laying_out = 1;
- bfd_set_arch_mach (output_bfd, ldfile_output_architecture, machine);
-}
+ /* If generating a relocatable output file, then we don't
+ have to examine the relocs. */
+ if (stub_file != NULL && !bfd_link_relocatable (&link_info))
+ {
+ ret = elf32_hppa_setup_section_lists (link_info.output_bfd, &link_info);
+ if (ret != 0)
+ {
+ if (ret < 0)
+ {
+ einfo (_("%X%P: can not size stub section: %E\n"));
+ return;
+ }
-/* The script itself gets inserted here. */
+ lang_for_each_statement (build_section_lists);
-static char *
-hppaelf_get_script(isfile)
- int *isfile;
-EOF
+ /* Call into the BFD backend to do the real work. */
+ if (! elf32_hppa_size_stubs (link_info.output_bfd,
+ stub_file->the_bfd,
+ &link_info,
+ multi_subspace,
+ group_size,
+ &hppaelf_add_stub_section,
+ &hppaelf_layout_sections_again))
+ {
+ einfo (_("%X%P: can not size stub section: %E\n"));
+ return;
+ }
+ }
+ }
-if test -n "$COMPILE_IN"
-then
-# Scripts compiled in.
+ if (need_laying_out != -1)
+ ldelf_map_segments (need_laying_out);
-# sed commands to quote an ld script as a C string.
-sc='s/["\\]/\\&/g
-s/$/\\n\\/
-1s/^/"/
-$s/$/n"/
-'
+ if (!bfd_link_relocatable (&link_info))
+ {
+ /* Set the global data pointer. */
+ if (! elf32_hppa_set_gp (link_info.output_bfd, &link_info))
+ {
+ einfo (_("%X%P: can not set gp\n"));
+ return;
+ }
-cat >>em_${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
- return `sed "$sc" ldscripts/${EMULATION_NAME}.x`;
+ /* Now build the linker stubs. */
+ if (stub_file != NULL && stub_file->the_bfd->sections != NULL)
+ {
+ if (! elf32_hppa_build_stubs (&link_info))
+ einfo (_("%X%P: can not build stubs: %E\n"));
+ }
+ }
}
-EOF
-else
-# Scripts read from the filesystem.
-
-cat >>em_${EMULATION_NAME}.c <<EOF
-{
- *isfile = 1;
-
- if (link_info.relocateable == true && config.build_constructors == true)
- return "ldscripts/${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/${EMULATION_NAME}.xn";
- else
- return "ldscripts/${EMULATION_NAME}.x";
-}
EOF
-fi
+# 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_MULTI_SUBSPACE 301
+#define OPTION_STUBGROUP_SIZE (OPTION_MULTI_SUBSPACE + 1)
+'
-cat >>em_${EMULATION_NAME}.c <<EOF
+PARSE_AND_LIST_LONGOPTS='
+ { "multi-subspace", no_argument, NULL, OPTION_MULTI_SUBSPACE },
+ { "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
+'
-struct ld_emulation_xfer_struct ld_hppaelf_emulation =
-{
- hppaelf_before_parse,
- syslib_default,
- hll_default,
- after_parse_default,
- after_allocation_default,
- hppaelf_set_output_arch,
- ldemul_default_target,
- before_allocation_default,
- hppaelf_get_script,
- "hppaelf",
- "elf32-hppa",
- hppaelf_finish,
- hppaelf_create_output_section_statements
-};
-EOF
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _("\
+ --multi-subspace Generate import and export stubs to support\n\
+ multiple sub-space shared libraries\n"
+ ));
+ fprintf (file, _("\
+ --stub-group-size=N Maximum size of a group of input sections that\n\
+ can be handled by one stub section. A negative\n\
+ value locates all stubs before their branches\n\
+ (with a group size of -N), while a positive\n\
+ value allows two groups of input sections, one\n\
+ before, and one after each stub section.\n\
+ Values of +/-1 indicate the linker should\n\
+ choose suitable defaults.\n"
+ ));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_MULTI_SUBSPACE:
+ multi_subspace = 1;
+ break;
+
+ case OPTION_STUBGROUP_SIZE:
+ {
+ const char *end;
+ group_size = bfd_scan_vma (optarg, &end, 0);
+ if (*end)
+ einfo (_("%F%P: invalid number `%s'\''\n"), optarg);
+ }
+ break;
+'
+
+# Put these extra hppaelf routines in ld_${EMULATION_NAME}_emulation
+#
+LDEMUL_AFTER_PARSE=hppaelf_after_parse
+LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=hppaelf_create_output_section_statements
projects / thirdparty / binutils-gdb.git / blobdiff