Index: emultempl/m68hc1xelf.em =================================================================== RCS file: emultempl/m68hc1xelf.em diff -N emultempl/m68hc1xelf.em --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ emultempl/m68hc1xelf.em 19 Apr 2003 08:00:55 -0000 @@ -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 <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