# 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${EMULATION_NAME}.c <<EOF
#include "ldctor.h"
#include "elf32-m68hc1x.h"
static asection *m68hc11elf_add_stub_section (const char *, asection *);
static lang_input_statement_type *stub_file;
static int no_trampoline = 0;
static const char* bank_window_name = 0;
static void
m68hc11_elf_${EMULATION_NAME}_before_allocation (void)
{
lang_memory_region_type* region;
int ret;
gld${EMULATION_NAME}_before_allocation ();
if (link_info.relocatable)
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;
}
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;
region = lang_memory_region_lookup (bank_window_name, FALSE);
if (region->length != 0)
{
struct m68hc11_page_info *pinfo;
unsigned i;
m68hc11_elf_get_bank_parameters (&link_info);
pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo;
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);
}
}
}
static void
m68hc11elf_create_output_section_statements (void)
{
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;
};
static bfd_boolean
hook_in_stub (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)
{
*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;
}
static asection *
m68hc11elf_add_stub_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);
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;
}
static void
gld${EMULATION_NAME}_finish (void)
{
if (stub_file->the_bfd->sections != NULL)
{
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");
}
}
static void (*real_func) (lang_input_statement_type *);
static void m68hc11_for_each_input_file_wrapper (lang_input_statement_type *l)
{
if (l != stub_file)
(*real_func) (l);
}
static void
m68hc11_lang_for_each_input_file (void (*func) (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