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-rw-r--r--ld/ChangeLog13
-rw-r--r--ld/emultempl/m68hc1xelf.em391
2 files changed, 404 insertions, 0 deletions
diff --git a/ld/ChangeLog b/ld/ChangeLog
index bba7a92..c7664ef 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,16 @@
+2003-04-19 Stephane Carrez <stcarrez@nerim.fr>
+
+ * emultempl/m68hc1xelf.em: New file to generate far trampolines on
+ 68HC11 and 68HC12.
+ (LDEMUL_BEFORE_ALLOCATION): Override to gather the trampolines to
+ generate.
+ (LDEMUL_FINISH): Override to generate the trampolines after gc and
+ linker relaxation.
+ (LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): Override to create the
+ stub file for trampolines.
+ (PARSE_AND_LIST_OPTIONS, PARSE_AND_LIST_LONGOPTS): New options
+ --no-trampoline and --bank-window to control the memory bank window.
+
2003-04-18 H.J. Lu <hjl@gnu.org>
* ldfile.c (ldfile_add_library_path): Remove the unused
diff --git a/ld/emultempl/m68hc1xelf.em b/ld/emultempl/m68hc1xelf.em
new file mode 100644
index 0000000..5e5dc10
--- /dev/null
+++ b/ld/emultempl/m68hc1xelf.em
@@ -0,0 +1,391 @@
+# This shell script emits a C file. -*- C -*-
+# Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003
+# 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#
+
+# This file is sourced from elf32.em, and defines extra m68hc12-elf
+# and m68hc11-elf specific routines. It is used to generate the
+# HC11/HC12 trampolines to call a far function by using a normal 'jsr/bsr'.
+#
+# - The HC11/HC12 relocations are checked to see if there is a
+# R_M68HC11_16 relocation to a symbol marked with STO_M68HC12_FAR.
+# This relocation cannot be made on the symbol but must be made on
+# its trampoline
+# The trampolines to generate are collected during this pass
+# (See elf32_m68hc11_size_stubs)
+#
+# - The trampolines are generated in a ".tramp" section. The generation
+# takes care of HC11 and HC12 specificities.
+# (See elf32_m68hc11_build_stubs)
+#
+# - During relocation the R_M68HC11_16 relocation to the far symbols
+# are redirected to the trampoline that was generated.
+#
+# Copied from hppaelf and adapted for M68HC11/M68HC12 specific needs.
+#
+cat >>e${EMULATION_NAME}.c <<EOF
+
+#include "ldctor.h"
+#include "elf32-m68hc1x.h"
+
+static void m68hc11elf_create_output_section_statements PARAMS ((void));
+static asection *m68hc11elf_add_stub_section
+ PARAMS ((const char *, asection *));
+static void gld${EMULATION_NAME}_finish PARAMS ((void));
+static void m68hc11_elf_${EMULATION_NAME}_before_allocation PARAMS ((void));
+
+
+/* Fake input file for stubs. */
+static lang_input_statement_type *stub_file;
+
+/* By default the HC11/HC12 trampolines to call a far function using
+ a normal 'bsr' and 'jsr' convention are generated during the link.
+ The --no-trampoline option prevents that. */
+static int no_trampoline = 0;
+
+/* Name of memory bank window in the MEMORY description.
+ This is set by --bank-window option. */
+static const char* bank_window_name = 0;
+
+static void
+m68hc11_elf_${EMULATION_NAME}_before_allocation ()
+{
+ lang_memory_region_type* region;
+ int ret;
+
+ gld${EMULATION_NAME}_before_allocation ();
+
+ /* If generating a relocatable output file, then we don't
+ have to generate the trampolines. */
+ if (link_info.relocateable)
+ return;
+
+ ret = elf32_m68hc11_setup_section_lists (output_bfd, &link_info);
+ if (ret != 0 && no_trampoline == 0)
+ {
+ if (ret < 0)
+ {
+ einfo ("%X%P: can not size stub section: %E\n");
+ return;
+ }
+
+ /* Call into the BFD backend to do the real work. */
+ if (!elf32_m68hc11_size_stubs (output_bfd,
+ stub_file->the_bfd,
+ &link_info,
+ &m68hc11elf_add_stub_section))
+ {
+ einfo ("%X%P: can not size stub section: %E\n");
+ return;
+ }
+ }
+
+ if (bank_window_name == 0)
+ return;
+
+ /* The 'bank_window_name' memory region is a special region that describes
+ the memory bank window to access to paged memory. For 68HC12
+ this is fixed and should be:
+
+ window (rx) : ORIGIN = 0x8000, LENGTH = 16K
+
+ But for 68HC11 this is board specific. The definition of such
+ memory region allows to control how this paged memory is accessed. */
+ region = lang_memory_region_lookup (bank_window_name);
+
+ /* Check the length to see if it was defined in the script. */
+ if (region->length != 0)
+ {
+ struct m68hc11_page_info *pinfo;
+ unsigned i;
+
+ /* Get default values */
+ m68hc11_elf_get_bank_parameters (&link_info);
+ pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo;
+
+ /* And override them with the region definition. */
+ pinfo->bank_size = region->length;
+ pinfo->bank_shift = 0;
+ for (i = pinfo->bank_size; i != 0; i >>= 1)
+ pinfo->bank_shift++;
+ pinfo->bank_shift--;
+ pinfo->bank_size = 1L << pinfo->bank_shift;
+ pinfo->bank_mask = (1 << pinfo->bank_shift) - 1;
+ pinfo->bank_physical = region->origin;
+ pinfo->bank_physical_end = region->origin + pinfo->bank_size;
+
+ if (pinfo->bank_size != region->length)
+ {
+ einfo (_("warning: the size of the 'window' memory region "
+ "is not a power of 2\n"));
+ einfo (_("warning: its size %d is truncated to %d\n"),
+ region->length, pinfo->bank_size);
+ }
+ }
+}
+
+/* This is called before the input files are opened. We create a new
+ fake input file to hold the stub sections. */
+
+static void
+m68hc11elf_create_output_section_statements ()
+{
+ 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);
+ if (stub_file->the_bfd == NULL
+ || !bfd_set_arch_mach (stub_file->the_bfd,
+ bfd_get_arch (output_bfd),
+ bfd_get_mach (output_bfd)))
+ {
+ einfo ("%X%P: can not create BFD %E\n");
+ return;
+ }
+
+ ldlang_add_file (stub_file);
+}
+
+
+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
+ PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
+
+static bfd_boolean
+hook_in_stub (info, lp)
+ struct hook_stub_info *info;
+ lang_statement_union_type **lp;
+{
+ lang_statement_union_type *l;
+ bfd_boolean ret;
+
+ for (; (l = *lp) != NULL; lp = &l->header.next)
+ {
+ switch (l->header.type)
+ {
+ case lang_constructors_statement_enum:
+ ret = hook_in_stub (info, &constructor_list.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_output_section_statement_enum:
+ ret = hook_in_stub (info,
+ &l->output_section_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ case lang_wild_statement_enum:
+ ret = hook_in_stub (info, &l->wild_statement.children.head);
+ if (ret)
+ return ret;
+ break;
+
+ 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
+ || strcmp (bfd_get_section_name (output_section,
+ l->input_section.section),
+ bfd_get_section_name (output_section,
+ info->input_section)) == 0)
+ {
+ /* 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;
+
+ 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_statement_enum:
+ case lang_assignment_statement_enum:
+ case lang_padding_statement_enum:
+ case lang_address_statement_enum:
+ case lang_fill_statement_enum:
+ break;
+
+ default:
+ FAIL ();
+ break;
+ }
+ }
+ return FALSE;
+}
+
+
+/* Call-back for elf32_m68hc11_size_stubs. */
+
+/* Create a new stub section, and arrange for it to be linked
+ immediately before INPUT_SECTION. */
+
+static asection *
+m68hc11elf_add_stub_section (stub_sec_name, tramp_section)
+ const char *stub_sec_name;
+ asection *tramp_section;
+{
+ asection *stub_sec;
+ flagword flags;
+ asection *output_section;
+ const char *secname;
+ lang_output_section_statement_type *os;
+ struct hook_stub_info info;
+
+ stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
+ if (stub_sec == NULL)
+ goto err_ret;
+
+ flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+ | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
+ if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
+ goto err_ret;
+
+ output_section = tramp_section->output_section;
+ secname = bfd_get_section_name (output_section->owner, output_section);
+ os = lang_output_section_find (secname);
+
+ /* Try to put the new section at the same place as an existing
+ .tramp section. Such .tramp section exists in most cases and
+ contains the trampoline code. This way we put the generated trampoline
+ at the correct place. */
+ info.input_section = tramp_section;
+ lang_list_init (&info.add);
+ lang_add_section (&info.add, stub_sec, os, stub_file);
+
+ 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;
+}
+
+/* Final emulation specific call. For the 68HC12 we use this opportunity
+ to build linker stubs. */
+
+static void
+gld${EMULATION_NAME}_finish ()
+{
+ /* Now build the linker stubs. */
+ if (stub_file->the_bfd->sections != NULL)
+ {
+ /* Call again the trampoline analyzer to initialize the trampoline
+ stubs with the correct symbol addresses. Since there could have
+ been relaxation, the symbol addresses that were found during
+ first call may no longer be correct. */
+ if (!elf32_m68hc11_size_stubs (output_bfd,
+ stub_file->the_bfd,
+ &link_info, 0))
+ {
+ einfo ("%X%P: can not size stub section: %E\n");
+ return;
+ }
+ if (!elf32_m68hc11_build_stubs (output_bfd, &link_info))
+ einfo ("%X%P: can not build stubs: %E\n");
+ }
+}
+
+
+/* Avoid processing the fake stub_file in vercheck, stat_needed and
+ check_needed routines. */
+
+static void m68hc11_for_each_input_file_wrapper
+ PARAMS ((lang_input_statement_type *));
+static void m68hc11_lang_for_each_input_file
+ PARAMS ((void (*) (lang_input_statement_type *)));
+
+static void (*real_func) PARAMS ((lang_input_statement_type *));
+
+static void m68hc11_for_each_input_file_wrapper (l)
+ lang_input_statement_type *l;
+{
+ if (l != stub_file)
+ (*real_func) (l);
+}
+
+static void
+m68hc11_lang_for_each_input_file (func)
+ void (*func) PARAMS ((lang_input_statement_type *));
+{
+ real_func = func;
+ lang_for_each_input_file (&m68hc11_for_each_input_file_wrapper);
+}
+
+#define lang_for_each_input_file m68hc11_lang_for_each_input_file
+
+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_NO_TRAMPOLINE 300
+#define OPTION_BANK_WINDOW 301
+'
+
+# The options are repeated below so that no abbreviations are allowed.
+# Otherwise -s matches stub-group-size
+PARSE_AND_LIST_LONGOPTS='
+ { "no-trampoline", no_argument, NULL, OPTION_NO_TRAMPOLINE },
+ { "bank-window", required_argument, NULL, OPTION_BANK_WINDOW },
+'
+
+PARSE_AND_LIST_OPTIONS='
+ fprintf (file, _(""
+" --no-trampoline Do not generate the far trampolines used to call\n"
+" a far function using 'jsr' or 'bsr'.\n"
+" --bank-window NAME Specify the name of the memory region describing\n"
+" the layout of the memory bank window.\n"
+ ));
+'
+
+PARSE_AND_LIST_ARGS_CASES='
+ case OPTION_NO_TRAMPOLINE:
+ no_trampoline = 1;
+ break;
+ case OPTION_BANK_WINDOW:
+ bank_window_name = optarg;
+ break;
+'
+
+# Put these extra m68hc11elf routines in ld_${EMULATION_NAME}_emulation
+#
+LDEMUL_BEFORE_ALLOCATION=m68hc11_elf_${EMULATION_NAME}_before_allocation
+LDEMUL_FINISH=gld${EMULATION_NAME}_finish
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=m68hc11elf_create_output_section_statements
generated by cgit v1.1 at 2024-12-12 18:42:19 +0000