* 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.
This commit is contained in:
Stephane Carrez
parent
62a3fc85ab
commit
67bb994066
13
ld/ChangeLog
13
ld/ChangeLog
@ -1,3 +1,16 @@
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2003-04-19 Stephane Carrez <stcarrez@nerim.fr>
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* emultempl/m68hc1xelf.em: New file to generate far trampolines on
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68HC11 and 68HC12.
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(LDEMUL_BEFORE_ALLOCATION): Override to gather the trampolines to
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generate.
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(LDEMUL_FINISH): Override to generate the trampolines after gc and
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linker relaxation.
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(LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): Override to create the
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stub file for trampolines.
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(PARSE_AND_LIST_OPTIONS, PARSE_AND_LIST_LONGOPTS): New options
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--no-trampoline and --bank-window to control the memory bank window.
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2003-04-18 H.J. Lu <hjl@gnu.org>
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* ldfile.c (ldfile_add_library_path): Remove the unused
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391
ld/emultempl/m68hc1xelf.em
Normal file
391
ld/emultempl/m68hc1xelf.em
Normal file
@ -0,0 +1,391 @@
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# This shell script emits a C file. -*- C -*-
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# Copyright 1991, 1993, 1994, 1997, 1999, 2000, 2001, 2002, 2003
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# Free Software Foundation, Inc.
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#
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# This file is part of GLD, the Gnu Linker.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# This file is sourced from elf32.em, and defines extra m68hc12-elf
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# and m68hc11-elf specific routines. It is used to generate the
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# HC11/HC12 trampolines to call a far function by using a normal 'jsr/bsr'.
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#
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# - The HC11/HC12 relocations are checked to see if there is a
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# R_M68HC11_16 relocation to a symbol marked with STO_M68HC12_FAR.
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# This relocation cannot be made on the symbol but must be made on
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# its trampoline
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# The trampolines to generate are collected during this pass
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# (See elf32_m68hc11_size_stubs)
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#
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# - The trampolines are generated in a ".tramp" section. The generation
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# takes care of HC11 and HC12 specificities.
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# (See elf32_m68hc11_build_stubs)
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#
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# - During relocation the R_M68HC11_16 relocation to the far symbols
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# are redirected to the trampoline that was generated.
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#
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# Copied from hppaelf and adapted for M68HC11/M68HC12 specific needs.
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#
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "ldctor.h"
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#include "elf32-m68hc1x.h"
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static void m68hc11elf_create_output_section_statements PARAMS ((void));
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static asection *m68hc11elf_add_stub_section
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PARAMS ((const char *, asection *));
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static void gld${EMULATION_NAME}_finish PARAMS ((void));
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static void m68hc11_elf_${EMULATION_NAME}_before_allocation PARAMS ((void));
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/* Fake input file for stubs. */
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static lang_input_statement_type *stub_file;
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/* By default the HC11/HC12 trampolines to call a far function using
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a normal 'bsr' and 'jsr' convention are generated during the link.
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The --no-trampoline option prevents that. */
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static int no_trampoline = 0;
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/* Name of memory bank window in the MEMORY description.
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This is set by --bank-window option. */
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static const char* bank_window_name = 0;
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static void
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m68hc11_elf_${EMULATION_NAME}_before_allocation ()
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{
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lang_memory_region_type* region;
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int ret;
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gld${EMULATION_NAME}_before_allocation ();
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/* If generating a relocatable output file, then we don't
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have to generate the trampolines. */
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if (link_info.relocateable)
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return;
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ret = elf32_m68hc11_setup_section_lists (output_bfd, &link_info);
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if (ret != 0 && no_trampoline == 0)
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{
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if (ret < 0)
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{
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einfo ("%X%P: can not size stub section: %E\n");
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return;
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}
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/* Call into the BFD backend to do the real work. */
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if (!elf32_m68hc11_size_stubs (output_bfd,
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stub_file->the_bfd,
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&link_info,
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&m68hc11elf_add_stub_section))
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{
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einfo ("%X%P: can not size stub section: %E\n");
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return;
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}
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}
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if (bank_window_name == 0)
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return;
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/* The 'bank_window_name' memory region is a special region that describes
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the memory bank window to access to paged memory. For 68HC12
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this is fixed and should be:
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window (rx) : ORIGIN = 0x8000, LENGTH = 16K
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But for 68HC11 this is board specific. The definition of such
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memory region allows to control how this paged memory is accessed. */
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region = lang_memory_region_lookup (bank_window_name);
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/* Check the length to see if it was defined in the script. */
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if (region->length != 0)
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{
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struct m68hc11_page_info *pinfo;
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unsigned i;
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/* Get default values */
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m68hc11_elf_get_bank_parameters (&link_info);
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pinfo = &m68hc11_elf_hash_table (&link_info)->pinfo;
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/* And override them with the region definition. */
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pinfo->bank_size = region->length;
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pinfo->bank_shift = 0;
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for (i = pinfo->bank_size; i != 0; i >>= 1)
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pinfo->bank_shift++;
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pinfo->bank_shift--;
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pinfo->bank_size = 1L << pinfo->bank_shift;
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pinfo->bank_mask = (1 << pinfo->bank_shift) - 1;
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pinfo->bank_physical = region->origin;
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pinfo->bank_physical_end = region->origin + pinfo->bank_size;
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if (pinfo->bank_size != region->length)
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{
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einfo (_("warning: the size of the 'window' memory region "
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"is not a power of 2\n"));
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einfo (_("warning: its size %d is truncated to %d\n"),
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region->length, pinfo->bank_size);
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}
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}
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}
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/* This is called before the input files are opened. We create a new
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fake input file to hold the stub sections. */
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static void
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m68hc11elf_create_output_section_statements ()
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{
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stub_file = lang_add_input_file ("linker stubs",
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lang_input_file_is_fake_enum,
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NULL);
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stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
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if (stub_file->the_bfd == NULL
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|| !bfd_set_arch_mach (stub_file->the_bfd,
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bfd_get_arch (output_bfd),
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bfd_get_mach (output_bfd)))
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{
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einfo ("%X%P: can not create BFD %E\n");
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return;
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}
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ldlang_add_file (stub_file);
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}
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struct hook_stub_info
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{
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lang_statement_list_type add;
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asection *input_section;
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};
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/* Traverse the linker tree to find the spot where the stub goes. */
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static bfd_boolean hook_in_stub
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PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
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static bfd_boolean
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hook_in_stub (info, lp)
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struct hook_stub_info *info;
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lang_statement_union_type **lp;
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{
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lang_statement_union_type *l;
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bfd_boolean ret;
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for (; (l = *lp) != NULL; lp = &l->header.next)
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{
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switch (l->header.type)
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{
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case lang_constructors_statement_enum:
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ret = hook_in_stub (info, &constructor_list.head);
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if (ret)
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return ret;
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break;
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case lang_output_section_statement_enum:
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ret = hook_in_stub (info,
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&l->output_section_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_wild_statement_enum:
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ret = hook_in_stub (info, &l->wild_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_group_statement_enum:
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ret = hook_in_stub (info, &l->group_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_input_section_enum:
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if (l->input_section.section == info->input_section
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|| strcmp (bfd_get_section_name (output_section,
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l->input_section.section),
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bfd_get_section_name (output_section,
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info->input_section)) == 0)
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{
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/* We've found our section. Insert the stub immediately
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before its associated input section. */
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*lp = info->add.head;
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*(info->add.tail) = l;
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return TRUE;
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}
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break;
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case lang_data_statement_enum:
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case lang_reloc_statement_enum:
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case lang_object_symbols_statement_enum:
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case lang_output_statement_enum:
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case lang_target_statement_enum:
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case lang_input_statement_enum:
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case lang_assignment_statement_enum:
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case lang_padding_statement_enum:
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case lang_address_statement_enum:
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case lang_fill_statement_enum:
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break;
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default:
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FAIL ();
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break;
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}
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}
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return FALSE;
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}
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/* Call-back for elf32_m68hc11_size_stubs. */
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/* Create a new stub section, and arrange for it to be linked
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immediately before INPUT_SECTION. */
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static asection *
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m68hc11elf_add_stub_section (stub_sec_name, tramp_section)
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const char *stub_sec_name;
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asection *tramp_section;
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{
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asection *stub_sec;
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flagword flags;
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asection *output_section;
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const char *secname;
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lang_output_section_statement_type *os;
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struct hook_stub_info info;
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stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
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if (stub_sec == NULL)
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goto err_ret;
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flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
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| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
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if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
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goto err_ret;
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output_section = tramp_section->output_section;
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secname = bfd_get_section_name (output_section->owner, output_section);
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os = lang_output_section_find (secname);
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/* Try to put the new section at the same place as an existing
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.tramp section. Such .tramp section exists in most cases and
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contains the trampoline code. This way we put the generated trampoline
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at the correct place. */
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info.input_section = tramp_section;
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lang_list_init (&info.add);
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lang_add_section (&info.add, stub_sec, os, stub_file);
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if (info.add.head == NULL)
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goto err_ret;
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if (hook_in_stub (&info, &os->children.head))
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return stub_sec;
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err_ret:
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einfo ("%X%P: can not make stub section: %E\n");
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return NULL;
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}
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/* Final emulation specific call. For the 68HC12 we use this opportunity
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to build linker stubs. */
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static void
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gld${EMULATION_NAME}_finish ()
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{
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/* Now build the linker stubs. */
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if (stub_file->the_bfd->sections != NULL)
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{
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/* Call again the trampoline analyzer to initialize the trampoline
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stubs with the correct symbol addresses. Since there could have
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been relaxation, the symbol addresses that were found during
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first call may no longer be correct. */
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if (!elf32_m68hc11_size_stubs (output_bfd,
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stub_file->the_bfd,
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&link_info, 0))
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{
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einfo ("%X%P: can not size stub section: %E\n");
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return;
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}
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if (!elf32_m68hc11_build_stubs (output_bfd, &link_info))
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einfo ("%X%P: can not build stubs: %E\n");
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}
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}
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/* Avoid processing the fake stub_file in vercheck, stat_needed and
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check_needed routines. */
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static void m68hc11_for_each_input_file_wrapper
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PARAMS ((lang_input_statement_type *));
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static void m68hc11_lang_for_each_input_file
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PARAMS ((void (*) (lang_input_statement_type *)));
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static void (*real_func) PARAMS ((lang_input_statement_type *));
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static void m68hc11_for_each_input_file_wrapper (l)
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lang_input_statement_type *l;
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{
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if (l != stub_file)
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(*real_func) (l);
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}
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static void
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m68hc11_lang_for_each_input_file (func)
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void (*func) PARAMS ((lang_input_statement_type *));
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{
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real_func = func;
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lang_for_each_input_file (&m68hc11_for_each_input_file_wrapper);
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}
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#define lang_for_each_input_file m68hc11_lang_for_each_input_file
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EOF
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# Define some shell vars to insert bits of code into the standard elf
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# parse_args and list_options functions.
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#
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PARSE_AND_LIST_PROLOGUE='
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#define OPTION_NO_TRAMPOLINE 300
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#define OPTION_BANK_WINDOW 301
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'
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# The options are repeated below so that no abbreviations are allowed.
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# Otherwise -s matches stub-group-size
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PARSE_AND_LIST_LONGOPTS='
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{ "no-trampoline", no_argument, NULL, OPTION_NO_TRAMPOLINE },
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{ "bank-window", required_argument, NULL, OPTION_BANK_WINDOW },
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'
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PARSE_AND_LIST_OPTIONS='
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fprintf (file, _(""
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" --no-trampoline Do not generate the far trampolines used to call\n"
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" a far function using 'jsr' or 'bsr'.\n"
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" --bank-window NAME Specify the name of the memory region describing\n"
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" the layout of the memory bank window.\n"
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));
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'
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PARSE_AND_LIST_ARGS_CASES='
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case OPTION_NO_TRAMPOLINE:
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no_trampoline = 1;
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break;
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case OPTION_BANK_WINDOW:
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bank_window_name = optarg;
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break;
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'
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# Put these extra m68hc11elf routines in ld_${EMULATION_NAME}_emulation
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#
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LDEMUL_BEFORE_ALLOCATION=m68hc11_elf_${EMULATION_NAME}_before_allocation
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LDEMUL_FINISH=gld${EMULATION_NAME}_finish
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LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=m68hc11elf_create_output_section_statements
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||||
Loading…
Reference in New Issue
Block a user