268 lines
8.5 KiB
Plaintext
268 lines
8.5 KiB
Plaintext
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# This shell script emits a C file. -*- C -*-
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# Copyright 2006
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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., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301 USA.
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# This file is sourced from elf32.em, and defines extra avr-elf
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# specific routines. It is used to generate the trampolines for the avr6
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# family devices where one needs to address the issue that it is not possible
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# to reach the whole program memory by using 16 bit pointers.
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "elf32-avr.h"
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#include "ldctor.h"
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/* The fake file and it's corresponding section meant to hold
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the linker stubs if needed. */
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static lang_input_statement_type *stub_file;
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static asection *avr_stub_section;
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/* Variables set by the command-line parameters and transfered
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to the bfd without use of global shared variables. */
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static bfd_boolean avr_no_stubs = FALSE;
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static bfd_boolean avr_debug_relax = FALSE;
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static bfd_boolean avr_debug_stubs = FALSE;
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static bfd_boolean avr_replace_call_ret_sequences = TRUE;
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static bfd_vma avr_pc_wrap_around = 0x10000000;
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/* Transfers information to the bfd frontend. */
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static void
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avr_elf_set_global_bfd_parameters (void)
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{
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elf32_avr_setup_params (& link_info,
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stub_file->the_bfd,
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avr_stub_section,
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avr_no_stubs,
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avr_debug_stubs,
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avr_debug_relax,
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avr_pc_wrap_around,
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avr_replace_call_ret_sequences);
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}
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/* Makes a conservative estimate of the trampoline section size that could
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be corrected later on. */
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static void
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avr_elf_${EMULATION_NAME}_before_allocation (void)
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{
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int ret;
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gld${EMULATION_NAME}_before_allocation ();
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/* We only need stubs for the avr6 family. */
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if (strcmp ("${EMULATION_NAME}","avr6"))
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avr_no_stubs = TRUE;
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avr_elf_set_global_bfd_parameters ();
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/* If generating a relocatable output file, then
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we don't have to generate the trampolines. */
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if (link_info.relocatable)
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avr_no_stubs = TRUE;
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if (avr_no_stubs)
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return;
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ret = elf32_avr_setup_section_lists (output_bfd, &link_info);
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if (ret < 0)
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einfo ("%X%P: can not setup the input section list: %E\n");
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if (ret <= 0)
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return;
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/* Call into the BFD backend to do the real "stub"-work. */
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if (! elf32_avr_size_stubs (output_bfd, &link_info, TRUE))
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einfo ("%X%P: can not size stub section: %E\n");
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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 section and generate the section itself. */
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static void
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avr_elf_create_output_section_statements (void)
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{
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flagword flags;
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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 stub BFD %E\n");
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return;
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}
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/* Now we add the stub section. */
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avr_stub_section = bfd_make_section_anyway (stub_file->the_bfd,
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".trampolines");
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if (avr_stub_section == 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, avr_stub_section, flags))
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goto err_ret;
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avr_stub_section->alignment_power = 1;
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ldlang_add_file (stub_file);
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return;
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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;
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}
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/* Re-calculates the size of the stubs so that we won't waste space. */
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static void
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avr_elf_finish (void)
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{
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if (!avr_no_stubs)
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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_avr_size_stubs (output_bfd, &link_info, FALSE))
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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_avr_build_stubs (&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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gld${EMULATION_NAME}_finish ();
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}
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EOF
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PARSE_AND_LIST_PROLOGUE='
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#define OPTION_NO_CALL_RET_REPLACEMENT 301
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#define OPTION_PMEM_WRAP_AROUND 302
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#define OPTION_NO_STUBS 303
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#define OPTION_DEBUG_STUBS 304
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#define OPTION_DEBUG_RELAX 305
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'
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PARSE_AND_LIST_LONGOPTS='
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{ "no-call-ret-replacement", no_argument,
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NULL, OPTION_NO_CALL_RET_REPLACEMENT},
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{ "pmem-wrap-around", required_argument,
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NULL, OPTION_PMEM_WRAP_AROUND},
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{ "no-stubs", no_argument,
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NULL, OPTION_NO_STUBS},
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{ "debug-stubs", no_argument,
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NULL, OPTION_DEBUG_STUBS},
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{ "debug-relax", no_argument,
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NULL, OPTION_DEBUG_RELAX},
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'
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PARSE_AND_LIST_OPTIONS='
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fprintf (file, _(" --pmem-wrap-around=<val> "
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"Make the linker relaxation machine assume that a\n"
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" "
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"program counter wrap-around occures at address\n"
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" "
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"<val>. Supported values are 16k, 32k and 64k.\n"));
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fprintf (file, _(" --no-call-ret-replacement "
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"The relaxation machine normally will\n"
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" "
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"substitute two immediately following call/ret\n"
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" "
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"instructions by a single jump instruction.\n"
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" "
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"This option disables this optimization.\n"));
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fprintf (file, _(" --no-stubs "
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"If the linker detects to attempt to access\n"
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" "
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"an instruction beyond 128k by a reloc that\n"
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" "
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"is limited to 128k max, it inserts a jump\n"
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" "
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"stub. You can de-active this with this switch.\n"));
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fprintf (file, _(" --debug-stubs Used for debugging avr-ld.\n"));
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fprintf (file, _(" --debug-relax Used for debugging avr-ld.\n"));
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'
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PARSE_AND_LIST_ARGS_CASES='
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case OPTION_PMEM_WRAP_AROUND:
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{
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/* This variable is defined in the bfd library. */
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if ((!strcmp (optarg,"32k")) || (!strcmp (optarg,"32K")))
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avr_pc_wrap_around = 32768;
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else if ((!strcmp (optarg,"16k")) || (!strcmp (optarg,"16K")))
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avr_pc_wrap_around = 16384;
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else if ((!strcmp (optarg,"64k")) || (!strcmp (optarg,"64K")))
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avr_pc_wrap_around = 0x10000;
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else
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return FALSE;
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}
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break;
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case OPTION_DEBUG_STUBS:
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avr_debug_stubs = TRUE;
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break;
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case OPTION_DEBUG_RELAX:
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avr_debug_relax = TRUE;
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break;
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case OPTION_NO_STUBS:
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avr_no_stubs = TRUE;
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break;
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case OPTION_NO_CALL_RET_REPLACEMENT:
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{
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/* This variable is defined in the bfd library. */
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avr_replace_call_ret_sequences = FALSE;
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}
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break;
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'
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#
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# Put these extra avr-elf routines in ld_${EMULATION_NAME}_emulation
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#
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LDEMUL_BEFORE_ALLOCATION=avr_elf_${EMULATION_NAME}_before_allocation
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LDEMUL_FINISH=avr_elf_finish
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LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=avr_elf_create_output_section_statements
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