mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
1ff6de0312
This is quite complicated because the CTF section's contents depend on the final contents of the symtab and strtab, because it has two sections whose contents are shuffled to be in 1:1 correspondence with the symtab, and an internal strtab that gets deduplicated against the ELF strtab (with offsets adjusted to point into the ELF strtab instead). It is also compressed if large enough, so its size depends on its contents! So we cannot construct it as early as most sections: we cannot even *begin* construction until after the symtab and strtab are finalized. Thankfully there is already one section treated similarly: compressed debugging sections: the only differences are that compressed debugging sections have extra handling to deal with their changing name if compressed (CTF sections are always called ".ctf" for now, though we have reserved ".ctf.*" against future use), and that compressed debugging sections have previously-uncompressed content which has to be stashed away for later compression, while CTF sections have no content at all until we generate it (very late). BFD also cannot do the link itself: libctf knows how to do it, and BFD cannot call libctf directly because libctf already depends on bfd for file I/O. So we have to use a pair of callbacks, one, examine_strtab, which allows a caller to examine the symtab and strtab after finalization (called from elf_link_swap_symbols_out(), right before the symtabs are written, and after the strtab has been finalized), and one which actually does the emission (called emit_ctf simply because it is grouped with a bunch of section-specific late-emission function calls at the bottom of bfd_elf_final_link, and a section-specific name seems best for that). emit_ctf is actually called *twice*: once from lang_process if the emulation suggests that this bfd target does not examine the symtab or strtab, and once via a bfd callback if it does. (This means that non-ELF targets still get CTF emitted, even though the late CTF emission stage is never called for them). v2: merged with non-ELF support patch: slight commit message adjustments. v3: do not spend time merging CTF, or crash, if the CTF section is explicitly discarded. Do not try to merge or compress CTF unless linking. v4: add CTF_COMPRESSION_THRESHOLD. Annul the freed input ctf_file_t's after writeout: set SEC_IN_MEMORY on the output contents so a future bfd enhancement knows it could free it. Add SEC_LINKER_CREATED | SEC_KEEP to avoid having to add .ctf to the linker script. Drop now-unnecessary ldlang.h-level elf-bfd.h include and hackery around it. Adapt to elf32.em->elf.em and elf-generic.em->ldelf*.c changes. v5: fix tabdamage. Drop #inclusions in .h files: include in .c files, .em files, and use struct forwards instead. Use bfd_section_is_ctf inline function rather than SECTION_IS_CTF macro. Move a few comments. * Makefile.def (dependencies): all-ld depends on all-libctf. * Makefile.in: Regenerated. include/ * bfdlink.h (elf_strtab_hash): New forward. (elf_sym_strtab): Likewise. (struct bfd_link_callbacks <examine_strtab>): New. (struct bfd_link_callbacks <emit_ctf>): Likewise. bfd/ * elf-bfd.h (bfd_section_is_ctf): New inline function. * elf.c (special_sections_c): Add ".ctf". (assign_file_positions_for_non_load_sections): Note that compressed debugging sections etc are not assigned here. Treat CTF sections like SEC_ELF_COMPRESS sections when is_linker_output: sh_offset -1. (assign_file_positions_except_relocs): Likewise. (find_section_in_list): Note that debugging and CTF sections, as well as reloc sections, are assigned later. (_bfd_elf_assign_file_positions_for_non_load): CTF sections get their size and contents updated. (_bfd_elf_set_section_contents): Skip CTF sections: unlike compressed sections, they have no uncompressed content to copy at this stage. * elflink.c (elf_link_swap_symbols_out): Call the examine_strtab callback right before the strtab is written out. (bfd_elf_final_link): Don't cache the section contents of CTF sections: they are not populated yet. Call the emit_ctf callback right at the end, after all the symbols and strings are flushed out. ld/ * ldlang.h: (struct lang_input_statement_struct): Add the_ctf. (struct elf_sym_strtab): Add forward. (struct elf_strtab_hash): Likewise. (ldlang_ctf_apply_strsym): Declare. (ldlang_write_ctf_late): Likewise. * ldemul.h (ldemul_emit_ctf_early): New. (ldemul_examine_strtab_for_ctf): Likewise. (ld_emulation_xfer_type) <emit_ctf_early>: Likewise. (ld_emulation_xfer_type) <examine_strtab_for_ctf>: Likewise. * ldemul.c (ldemul_emit_ctf_early): New. (ldemul_examine_strtab_for_ctf): Likewise. * ldlang.c: Include ctf-api.h. (CTF_COMPRESSION_THRESHOLD): New. (ctf_output): New. Initialized in... (ldlang_open_ctf): ... this new function. Open all the CTF sections in the input files: mark them non-loaded and empty so as not to copy their contents to the output, but linker-created so the section gets created in the target. (ldlang_merge_ctf): New, merge types via ctf_link_add_ctf and ctf_link. (ldlang_ctf_apply_strsym): New, an examine_strtab callback: wrap ldemul_examine_strtab_for_ctf. (lang_write_ctf): New, write out the CTF section. (ldlang_write_ctf_late): New, late call via bfd's emit_ctf hook. (lang_process): Call ldlang_open_ctf, ldlang_merge_ctf, and lang_write_ctf. * ldmain.c (link_callbacks): Add ldlang_ctf_apply_strsym, ldlang_write_ctf_late. * emultempl/aix.em: Add ctf-api.h. * emultempl/armcoff.em: Likewise. * emultempl/beos.em: Likewise. * emultempl/elf.em: Likewise. * emultempl/generic.em: Likewise. * emultempl/linux.em: Likewise. * emultempl/msp430.em: Likewise. * emultempl/pe.em: Likewise. * emultempl/pep.em: Likewise. * emultempl/ticoff.em: Likewise. * emultempl/vanilla.em: Likewise. * ldcref.c: Likewise. * ldctor.c: Likewise. * ldelf.c: Likewise. * ldelfgen.c: Likewise. * ldemul.c: Likewise. * ldexp.c: Likewise. * ldfile.c: Likewise. * ldgram.c: Likewise. * ldlex.l: Likewise. * ldmain.c: Likewise. * ldmisc.c: Likewise. * ldver.c: Likewise. * ldwrite.c: Likewise. * lexsup.c: Likewise. * mri.c: Likewise. * pe-dll.c: Likewise. * plugin.c: Likewise. * ldelfgen.c (ldelf_emit_ctf_early): New. (ldelf_examine_strtab_for_ctf): tell libctf about the symtab and strtab. (struct ctf_strsym_iter_cb_arg): New, state to do so. (ldelf_ctf_strtab_iter_cb): New: tell libctf about each string in the strtab in turn. (ldelf_ctf_symbols_iter_cb): New, tell libctf about each symbol in the symtab in turn. * ldelfgen.h (struct elf_sym_strtab): Add forward. (struct elf_strtab_hash): Likewise. (struct ctf_file): Likewise. (ldelf_emit_ctf_early): Declare. (ldelf_examine_strtab_for_ctf): Likewise. * emultempl/elf-generic.em (LDEMUL_EMIT_CTF_EARLY): Set it. (LDEMUL_EXAMINE_STRTAB_FOR_CTF): Likewise. * emultempl/aix.em (ld_${EMULATION_NAME}_emulation): Add emit_ctf_early and examine_strtab_for_ctf, NULL by default. * emultempl/armcoff.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/beos.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/elf.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/generic.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/linux.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/msp430.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/pe.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/pep.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/ticoff.em (ld_${EMULATION_NAME}_emulation): Likewise. * emultempl/vanilla.em (ld_vanilla_emulation): Likewise. * Makefile.am: Pull in libctf (and zlib, a transitive requirement for compressed CTF section emission). Pass it on to DejaGNU. * configure.ac: Add AM_ZLIB. * aclocal.m4: Added zlib.m4. * Makefile.in: Regenerated. * testsuite/ld-bootstrap/bootstrap.exp: Use it when relinking ld.
857 lines
23 KiB
Plaintext
857 lines
23 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
|
||
# It does some substitutions.
|
||
fragment <<EOF
|
||
/* This file is is generated by a shell script. DO NOT EDIT! */
|
||
|
||
/* Emulate the original gld for the given ${EMULATION_NAME}
|
||
Copyright (C) 2014-2019 Free Software Foundation, Inc.
|
||
Written by Steve Chamberlain steve@cygnus.com
|
||
Extended for the MSP430 by Nick Clifton nickc@redhat.com
|
||
|
||
This file is part of the GNU Binutils.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
||
MA 02110-1301, USA. */
|
||
|
||
#define TARGET_IS_${EMULATION_NAME}
|
||
|
||
#include "sysdep.h"
|
||
#include "bfd.h"
|
||
#include "bfdlink.h"
|
||
#include "ctf-api.h"
|
||
|
||
#include "ld.h"
|
||
#include "getopt.h"
|
||
#include "ldmain.h"
|
||
#include "ldmisc.h"
|
||
#include "ldexp.h"
|
||
#include "ldlang.h"
|
||
#include "ldfile.h"
|
||
#include "ldemul.h"
|
||
#include "libiberty.h"
|
||
#include <ldgram.h>
|
||
|
||
enum regions
|
||
{
|
||
REGION_NONE = 0,
|
||
REGION_LOWER,
|
||
REGION_UPPER,
|
||
REGION_EITHER = 3,
|
||
};
|
||
|
||
enum either_placement_stage
|
||
{
|
||
LOWER_TO_UPPER,
|
||
UPPER_TO_LOWER,
|
||
};
|
||
|
||
enum { ROM, RAM };
|
||
|
||
static int data_region = REGION_NONE;
|
||
static int code_region = REGION_NONE;
|
||
static bfd_boolean disable_sec_transformation = FALSE;
|
||
|
||
#define MAX_PREFIX_LENGTH 7
|
||
|
||
EOF
|
||
|
||
# Import any needed special functions and/or overrides.
|
||
#
|
||
if test -n "$EXTRA_EM_FILE" ; then
|
||
source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
|
||
fi
|
||
|
||
if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
|
||
fragment <<EOF
|
||
|
||
static void
|
||
gld${EMULATION_NAME}_before_parse (void)
|
||
{
|
||
#ifndef TARGET_ /* I.e., if not generic. */
|
||
ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
|
||
#endif /* not TARGET_ */
|
||
|
||
/* The MSP430 port *needs* linker relaxtion in order to cope with large
|
||
functions where conditional branches do not fit into a +/- 1024 byte range. */
|
||
if (!bfd_link_relocatable (&link_info))
|
||
TARGET_ENABLE_RELAXATION;
|
||
}
|
||
|
||
EOF
|
||
fi
|
||
|
||
if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
|
||
fragment <<EOF
|
||
|
||
static char *
|
||
gld${EMULATION_NAME}_get_script (int *isfile)
|
||
EOF
|
||
|
||
if test x"$COMPILE_IN" = xyes
|
||
then
|
||
# Scripts compiled in.
|
||
|
||
# sed commands to quote an ld script as a C string.
|
||
sc="-f stringify.sed"
|
||
|
||
fragment <<EOF
|
||
{
|
||
*isfile = 0;
|
||
|
||
if (bfd_link_relocatable (&link_info) && config.build_constructors)
|
||
return
|
||
EOF
|
||
sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
|
||
echo ' ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
|
||
echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
|
||
echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
|
||
echo ' ; else return' >> e${EMULATION_NAME}.c
|
||
sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
|
||
echo '; }' >> e${EMULATION_NAME}.c
|
||
|
||
else
|
||
# Scripts read from the filesystem.
|
||
|
||
fragment <<EOF
|
||
{
|
||
*isfile = 1;
|
||
|
||
if (bfd_link_relocatable (&link_info) && config.build_constructors)
|
||
return "ldscripts/${EMULATION_NAME}.xu";
|
||
else if (bfd_link_relocatable (&link_info))
|
||
return "ldscripts/${EMULATION_NAME}.xr";
|
||
else if (!config.text_read_only)
|
||
return "ldscripts/${EMULATION_NAME}.xbn";
|
||
else if (!config.magic_demand_paged)
|
||
return "ldscripts/${EMULATION_NAME}.xn";
|
||
else
|
||
return "ldscripts/${EMULATION_NAME}.x";
|
||
}
|
||
EOF
|
||
fi
|
||
fi
|
||
|
||
if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
|
||
fragment <<EOF
|
||
|
||
static unsigned int
|
||
data_statement_size (lang_data_statement_type *d)
|
||
{
|
||
unsigned int size = 0;
|
||
switch (d->type)
|
||
{
|
||
case QUAD:
|
||
case SQUAD:
|
||
size = QUAD_SIZE;
|
||
break;
|
||
case LONG:
|
||
size = LONG_SIZE;
|
||
break;
|
||
case SHORT:
|
||
size = SHORT_SIZE;
|
||
break;
|
||
case BYTE:
|
||
size = BYTE_SIZE;
|
||
break;
|
||
default:
|
||
einfo (_("%P: error: unhandled data_statement size\n"));
|
||
FAIL ();
|
||
}
|
||
return size;
|
||
}
|
||
|
||
/* Helper function for place_orphan that computes the size
|
||
of sections already mapped to the given statement. */
|
||
|
||
static bfd_size_type
|
||
scan_children (lang_statement_union_type * l)
|
||
{
|
||
bfd_size_type amount = 0;
|
||
|
||
while (l != NULL)
|
||
{
|
||
switch (l->header.type)
|
||
{
|
||
case lang_input_section_enum:
|
||
if (l->input_section.section->flags & SEC_ALLOC)
|
||
amount += l->input_section.section->size;
|
||
break;
|
||
|
||
case lang_constructors_statement_enum:
|
||
case lang_assignment_statement_enum:
|
||
case lang_padding_statement_enum:
|
||
break;
|
||
|
||
case lang_wild_statement_enum:
|
||
amount += scan_children (l->wild_statement.children.head);
|
||
break;
|
||
|
||
case lang_data_statement_enum:
|
||
amount += data_statement_size (&l->data_statement);
|
||
break;
|
||
|
||
default:
|
||
fprintf (stderr, "msp430 orphan placer: unhandled lang type %d\n", l->header.type);
|
||
break;
|
||
}
|
||
|
||
l = l->header.next;
|
||
}
|
||
|
||
return amount;
|
||
}
|
||
|
||
#define WARN_UPPER 0
|
||
#define WARN_LOWER 1
|
||
#define WARN_TEXT 0
|
||
#define WARN_DATA 1
|
||
#define WARN_BSS 2
|
||
#define WARN_RODATA 3
|
||
|
||
/* Warn only once per output section.
|
||
* NAME starts with ".upper." or ".lower.". */
|
||
static void
|
||
warn_no_output_section (const char *name)
|
||
{
|
||
static bfd_boolean warned[2][4] = {{FALSE, FALSE, FALSE, FALSE},
|
||
{FALSE, FALSE, FALSE, FALSE}};
|
||
int i = WARN_LOWER;
|
||
|
||
if (strncmp (name, ".upper.", 7) == 0)
|
||
i = WARN_UPPER;
|
||
|
||
if (!warned[i][WARN_TEXT] && strcmp (name + 6, ".text") == 0)
|
||
warned[i][WARN_TEXT] = TRUE;
|
||
else if (!warned[i][WARN_DATA] && strcmp (name + 6, ".data") == 0)
|
||
warned[i][WARN_DATA] = TRUE;
|
||
else if (!warned[i][WARN_BSS] && strcmp (name + 6, ".bss") == 0)
|
||
warned[i][WARN_BSS] = TRUE;
|
||
else if (!warned[i][WARN_RODATA] && strcmp (name + 6, ".rodata") == 0)
|
||
warned[i][WARN_RODATA] = TRUE;
|
||
else
|
||
return;
|
||
einfo ("%P: warning: no input section rule matches %s in linker script\n",
|
||
name);
|
||
}
|
||
|
||
|
||
/* Place an orphan section. We use this to put .either sections
|
||
into either their lower or their upper equivalents. */
|
||
|
||
static lang_output_section_statement_type *
|
||
gld${EMULATION_NAME}_place_orphan (asection * s,
|
||
const char * secname,
|
||
int constraint)
|
||
{
|
||
char * lower_name;
|
||
char * upper_name;
|
||
char * name;
|
||
char * buf = NULL;
|
||
lang_output_section_statement_type * lower;
|
||
lang_output_section_statement_type * upper;
|
||
|
||
if ((s->flags & SEC_ALLOC) == 0)
|
||
return NULL;
|
||
|
||
if (bfd_link_relocatable (&link_info))
|
||
return NULL;
|
||
|
||
/* If constraints are involved let the linker handle the placement normally. */
|
||
if (constraint != 0)
|
||
return NULL;
|
||
|
||
if (strncmp (secname, ".upper.", 7) == 0
|
||
|| strncmp (secname, ".lower.", 7) == 0)
|
||
{
|
||
warn_no_output_section (secname);
|
||
return NULL;
|
||
}
|
||
|
||
/* We only need special handling for .either sections. */
|
||
if (strncmp (secname, ".either.", 8) != 0)
|
||
return NULL;
|
||
|
||
/* Skip the .either prefix. */
|
||
secname += 7;
|
||
|
||
/* Compute the names of the corresponding upper and lower
|
||
sections. If the input section name contains another period,
|
||
only use the part of the name before the second dot. */
|
||
if (strchr (secname + 1, '.') != NULL)
|
||
{
|
||
buf = name = xstrdup (secname);
|
||
|
||
* strchr (name + 1, '.') = 0;
|
||
}
|
||
else
|
||
name = (char *) secname;
|
||
|
||
lower_name = concat (".lower", name, NULL);
|
||
upper_name = concat (".upper", name, NULL);
|
||
|
||
/* Find the corresponding lower and upper sections. */
|
||
lower = lang_output_section_find (lower_name);
|
||
upper = lang_output_section_find (upper_name);
|
||
|
||
if (lower == NULL && upper == NULL)
|
||
{
|
||
einfo (_("%P: error: no section named %s or %s in linker script\n"),
|
||
lower_name, upper_name);
|
||
goto end;
|
||
}
|
||
else if (lower == NULL)
|
||
{
|
||
lower = lang_output_section_find (name);
|
||
if (lower == NULL)
|
||
{
|
||
einfo (_("%P: error: no section named %s in linker script\n"), name);
|
||
goto end;
|
||
}
|
||
}
|
||
|
||
/* Always place orphaned sections in lower. Optimal placement of either
|
||
sections is performed later, once section sizes have been finalized. */
|
||
lang_add_section (& lower->children, s, NULL, lower);
|
||
end:
|
||
free (upper_name);
|
||
free (lower_name);
|
||
if (buf)
|
||
free (buf);
|
||
return lower;
|
||
}
|
||
EOF
|
||
fi
|
||
|
||
fragment <<EOF
|
||
|
||
static bfd_boolean
|
||
change_output_section (lang_statement_union_type ** head,
|
||
asection *s,
|
||
lang_output_section_statement_type * new_output_section)
|
||
{
|
||
asection *is;
|
||
lang_statement_union_type * prev = NULL;
|
||
lang_statement_union_type * curr;
|
||
|
||
curr = *head;
|
||
while (curr != NULL)
|
||
{
|
||
switch (curr->header.type)
|
||
{
|
||
case lang_input_section_enum:
|
||
is = curr->input_section.section;
|
||
if (is == s)
|
||
{
|
||
s->output_section = NULL;
|
||
lang_add_section (& (new_output_section->children), s, NULL,
|
||
new_output_section);
|
||
/* Remove the section from the old output section. */
|
||
if (prev == NULL)
|
||
*head = curr->header.next;
|
||
else
|
||
prev->header.next = curr->header.next;
|
||
return TRUE;
|
||
}
|
||
break;
|
||
case lang_wild_statement_enum:
|
||
if (change_output_section (&(curr->wild_statement.children.head),
|
||
s, new_output_section))
|
||
return TRUE;
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
prev = curr;
|
||
curr = curr->header.next;
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
static void
|
||
add_region_prefix (bfd *abfd ATTRIBUTE_UNUSED, asection *s,
|
||
void *unused ATTRIBUTE_UNUSED)
|
||
{
|
||
const char *curr_name = bfd_section_name (s);
|
||
int region = REGION_NONE;
|
||
|
||
if (strncmp (curr_name, ".text", 5) == 0)
|
||
region = code_region;
|
||
else if (strncmp (curr_name, ".data", 5) == 0)
|
||
region = data_region;
|
||
else if (strncmp (curr_name, ".bss", 4) == 0)
|
||
region = data_region;
|
||
else if (strncmp (curr_name, ".rodata", 7) == 0)
|
||
region = data_region;
|
||
else
|
||
return;
|
||
|
||
switch (region)
|
||
{
|
||
case REGION_NONE:
|
||
break;
|
||
case REGION_UPPER:
|
||
bfd_rename_section (s, concat (".upper", curr_name, NULL));
|
||
break;
|
||
case REGION_LOWER:
|
||
bfd_rename_section (s, concat (".lower", curr_name, NULL));
|
||
break;
|
||
case REGION_EITHER:
|
||
s->name = concat (".either", curr_name, NULL);
|
||
break;
|
||
default:
|
||
/* Unreachable. */
|
||
FAIL ();
|
||
break;
|
||
}
|
||
}
|
||
|
||
static void
|
||
msp430_elf_after_open (void)
|
||
{
|
||
bfd *abfd;
|
||
|
||
gld${EMULATION_NAME}_after_open ();
|
||
|
||
/* If neither --code-region or --data-region have been passed, do not
|
||
transform sections names. */
|
||
if ((code_region == REGION_NONE && data_region == REGION_NONE)
|
||
|| disable_sec_transformation)
|
||
return;
|
||
|
||
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
|
||
bfd_map_over_sections (abfd, add_region_prefix, NULL);
|
||
}
|
||
|
||
#define OPTION_CODE_REGION 321
|
||
#define OPTION_DATA_REGION (OPTION_CODE_REGION + 1)
|
||
#define OPTION_DISABLE_TRANS (OPTION_CODE_REGION + 2)
|
||
|
||
static void
|
||
gld${EMULATION_NAME}_add_options
|
||
(int ns, char **shortopts, int nl, struct option **longopts,
|
||
int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
|
||
{
|
||
static const char xtra_short[] = { };
|
||
|
||
static const struct option xtra_long[] =
|
||
{
|
||
{ "code-region", required_argument, NULL, OPTION_CODE_REGION },
|
||
{ "data-region", required_argument, NULL, OPTION_DATA_REGION },
|
||
{ "disable-sec-transformation", no_argument, NULL,
|
||
OPTION_DISABLE_TRANS },
|
||
{ NULL, no_argument, NULL, 0 }
|
||
};
|
||
|
||
*shortopts = (char *) xrealloc (*shortopts, ns + sizeof (xtra_short));
|
||
memcpy (*shortopts + ns, &xtra_short, sizeof (xtra_short));
|
||
*longopts = (struct option *)
|
||
xrealloc (*longopts, nl * sizeof (struct option) + sizeof (xtra_long));
|
||
memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
|
||
}
|
||
|
||
static void
|
||
gld${EMULATION_NAME}_list_options (FILE * file)
|
||
{
|
||
fprintf (file, _(" --code-region={either,lower,upper,none}\n\
|
||
Transform .text* sections to {either,lower,upper,none}.text* sections\n"));
|
||
fprintf (file, _(" --data-region={either,lower,upper,none}\n\
|
||
Transform .data*, .rodata* and .bss* sections to\n\
|
||
{either,lower,upper,none}.{bss,data,rodata}* sections\n"));
|
||
fprintf (file, _(" --disable-sec-transformation\n\
|
||
Disable transformation of .{text,data,bss,rodata}* sections to\n\
|
||
add the {either,lower,upper,none} prefixes\n"));
|
||
}
|
||
|
||
static bfd_boolean
|
||
gld${EMULATION_NAME}_handle_option (int optc)
|
||
{
|
||
switch (optc)
|
||
{
|
||
case OPTION_CODE_REGION:
|
||
if (strcmp (optarg, "upper") == 0)
|
||
code_region = REGION_UPPER;
|
||
else if (strcmp (optarg, "lower") == 0)
|
||
code_region = REGION_LOWER;
|
||
else if (strcmp (optarg, "either") == 0)
|
||
code_region = REGION_EITHER;
|
||
else if (strcmp (optarg, "none") == 0)
|
||
code_region = REGION_NONE;
|
||
else if (strlen (optarg) == 0)
|
||
{
|
||
einfo (_("%P: --code-region requires an argument: "
|
||
"{upper,lower,either,none}\n"));
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
einfo (_("%P: error: unrecognized argument to --code-region= option: "
|
||
"\"%s\"\n"), optarg);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case OPTION_DATA_REGION:
|
||
if (strcmp (optarg, "upper") == 0)
|
||
data_region = REGION_UPPER;
|
||
else if (strcmp (optarg, "lower") == 0)
|
||
data_region = REGION_LOWER;
|
||
else if (strcmp (optarg, "either") == 0)
|
||
data_region = REGION_EITHER;
|
||
else if (strcmp (optarg, "none") == 0)
|
||
data_region = REGION_NONE;
|
||
else if (strlen (optarg) == 0)
|
||
{
|
||
einfo (_("%P: --data-region requires an argument: "
|
||
"{upper,lower,either,none}\n"));
|
||
return FALSE;
|
||
}
|
||
else
|
||
{
|
||
einfo (_("%P: error: unrecognized argument to --data-region= option: "
|
||
"\"%s\"\n"), optarg);
|
||
return FALSE;
|
||
}
|
||
break;
|
||
|
||
case OPTION_DISABLE_TRANS:
|
||
disable_sec_transformation = TRUE;
|
||
break;
|
||
|
||
default:
|
||
return FALSE;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
static void
|
||
eval_upper_either_sections (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *s, void *data)
|
||
{
|
||
const char * base_sec_name;
|
||
const char * curr_name;
|
||
char * either_name;
|
||
int curr_region;
|
||
|
||
lang_output_section_statement_type * lower;
|
||
lang_output_section_statement_type * upper;
|
||
static bfd_size_type *lower_size = 0;
|
||
static bfd_size_type *upper_size = 0;
|
||
static bfd_size_type lower_size_rom = 0;
|
||
static bfd_size_type lower_size_ram = 0;
|
||
static bfd_size_type upper_size_rom = 0;
|
||
static bfd_size_type upper_size_ram = 0;
|
||
|
||
if ((s->flags & SEC_ALLOC) == 0)
|
||
return;
|
||
if (bfd_link_relocatable (&link_info))
|
||
return;
|
||
|
||
base_sec_name = (const char *) data;
|
||
curr_name = bfd_section_name (s);
|
||
|
||
/* Only concerned with .either input sections in the upper output section. */
|
||
either_name = concat (".either", base_sec_name, NULL);
|
||
if (strncmp (curr_name, either_name, strlen (either_name)) != 0
|
||
|| strncmp (s->output_section->name, ".upper", 6) != 0)
|
||
goto end;
|
||
|
||
lower = lang_output_section_find (concat (".lower", base_sec_name, NULL));
|
||
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
|
||
|
||
if (upper == NULL || upper->region == NULL)
|
||
goto end;
|
||
else if (lower == NULL)
|
||
lower = lang_output_section_find (base_sec_name);
|
||
if (lower == NULL || lower->region == NULL)
|
||
goto end;
|
||
|
||
if (strcmp (base_sec_name, ".text") == 0
|
||
|| strcmp (base_sec_name, ".rodata") == 0)
|
||
curr_region = ROM;
|
||
else
|
||
curr_region = RAM;
|
||
|
||
if (curr_region == ROM)
|
||
{
|
||
if (lower_size_rom == 0)
|
||
{
|
||
lower_size_rom = lower->region->current - lower->region->origin;
|
||
upper_size_rom = upper->region->current - upper->region->origin;
|
||
}
|
||
lower_size = &lower_size_rom;
|
||
upper_size = &upper_size_rom;
|
||
}
|
||
else if (curr_region == RAM)
|
||
{
|
||
if (lower_size_ram == 0)
|
||
{
|
||
lower_size_ram = lower->region->current - lower->region->origin;
|
||
upper_size_ram = upper->region->current - upper->region->origin;
|
||
}
|
||
lower_size = &lower_size_ram;
|
||
upper_size = &upper_size_ram;
|
||
}
|
||
|
||
/* Move sections in the upper region that would fit in the lower
|
||
region to the lower region. */
|
||
if (*lower_size + s->size < lower->region->length)
|
||
{
|
||
if (change_output_section (&(upper->children.head), s, lower))
|
||
{
|
||
*upper_size -= s->size;
|
||
*lower_size += s->size;
|
||
}
|
||
}
|
||
end:
|
||
free (either_name);
|
||
}
|
||
|
||
static void
|
||
eval_lower_either_sections (bfd *abfd ATTRIBUTE_UNUSED,
|
||
asection *s, void *data)
|
||
{
|
||
const char * base_sec_name;
|
||
const char * curr_name;
|
||
char * either_name;
|
||
int curr_region;
|
||
lang_output_section_statement_type * output_sec;
|
||
lang_output_section_statement_type * lower;
|
||
lang_output_section_statement_type * upper;
|
||
|
||
static bfd_size_type *lower_size = 0;
|
||
static bfd_size_type lower_size_rom = 0;
|
||
static bfd_size_type lower_size_ram = 0;
|
||
|
||
if ((s->flags & SEC_ALLOC) == 0)
|
||
return;
|
||
if (bfd_link_relocatable (&link_info))
|
||
return;
|
||
|
||
base_sec_name = (const char *) data;
|
||
curr_name = bfd_section_name (s);
|
||
|
||
/* Only concerned with .either input sections in the lower or "default"
|
||
output section i.e. not in the upper output section. */
|
||
either_name = concat (".either", base_sec_name, NULL);
|
||
if (strncmp (curr_name, either_name, strlen (either_name)) != 0
|
||
|| strncmp (s->output_section->name, ".upper", 6) == 0)
|
||
return;
|
||
|
||
if (strcmp (base_sec_name, ".text") == 0
|
||
|| strcmp (base_sec_name, ".rodata") == 0)
|
||
curr_region = ROM;
|
||
else
|
||
curr_region = RAM;
|
||
|
||
output_sec = lang_output_section_find (s->output_section->name);
|
||
|
||
/* If the output_section doesn't exist, this has already been reported in
|
||
place_orphan, so don't need to warn again. */
|
||
if (output_sec == NULL || output_sec->region == NULL)
|
||
goto end;
|
||
|
||
/* lower and output_sec might be the same, but in some cases an .either
|
||
section can end up in base_sec_name if it hasn't been placed by
|
||
place_orphan. */
|
||
lower = lang_output_section_find (concat (".lower", base_sec_name, NULL));
|
||
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
|
||
if (upper == NULL)
|
||
goto end;
|
||
|
||
if (curr_region == ROM)
|
||
{
|
||
if (lower_size_rom == 0)
|
||
{
|
||
/* Get the size of other items in the lower region that aren't the
|
||
sections to be moved around. */
|
||
lower_size_rom
|
||
= (output_sec->region->current - output_sec->region->origin)
|
||
- scan_children (output_sec->children.head);
|
||
if (output_sec != lower && lower != NULL)
|
||
lower_size_rom -= scan_children (lower->children.head);
|
||
}
|
||
lower_size = &lower_size_rom;
|
||
}
|
||
else if (curr_region == RAM)
|
||
{
|
||
if (lower_size_ram == 0)
|
||
{
|
||
lower_size_ram
|
||
= (output_sec->region->current - output_sec->region->origin)
|
||
- scan_children (output_sec->children.head);
|
||
if (output_sec != lower && lower != NULL)
|
||
lower_size_ram -= scan_children (lower->children.head);
|
||
}
|
||
lower_size = &lower_size_ram;
|
||
}
|
||
/* Move sections that cause the lower region to overflow to the upper region. */
|
||
if (*lower_size + s->size > output_sec->region->length)
|
||
change_output_section (&(output_sec->children.head), s, upper);
|
||
else
|
||
*lower_size += s->size;
|
||
end:
|
||
free (either_name);
|
||
}
|
||
|
||
/* This function is similar to lang_relax_sections, but without the size
|
||
evaluation code that is always executed after relaxation. */
|
||
static void
|
||
intermediate_relax_sections (void)
|
||
{
|
||
int i = link_info.relax_pass;
|
||
|
||
/* The backend can use it to determine the current pass. */
|
||
link_info.relax_pass = 0;
|
||
|
||
while (i--)
|
||
{
|
||
bfd_boolean relax_again;
|
||
|
||
link_info.relax_trip = -1;
|
||
do
|
||
{
|
||
link_info.relax_trip++;
|
||
|
||
lang_do_assignments (lang_assigning_phase_enum);
|
||
|
||
lang_reset_memory_regions ();
|
||
|
||
relax_again = FALSE;
|
||
lang_size_sections (&relax_again, FALSE);
|
||
}
|
||
while (relax_again);
|
||
|
||
link_info.relax_pass++;
|
||
}
|
||
}
|
||
|
||
static void
|
||
msp430_elf_after_allocation (void)
|
||
{
|
||
int relax_count = 0;
|
||
unsigned int i;
|
||
/* Go over each section twice, once to place either sections that don't fit
|
||
in lower into upper, and then again to move any sections in upper that
|
||
fit in lower into lower. */
|
||
for (i = 0; i < 8; i++)
|
||
{
|
||
int placement_stage = (i < 4) ? LOWER_TO_UPPER : UPPER_TO_LOWER;
|
||
const char * base_sec_name;
|
||
lang_output_section_statement_type * upper;
|
||
|
||
switch (i % 4)
|
||
{
|
||
default:
|
||
case 0:
|
||
base_sec_name = ".text";
|
||
break;
|
||
case 1:
|
||
base_sec_name = ".data";
|
||
break;
|
||
case 2:
|
||
base_sec_name = ".bss";
|
||
break;
|
||
case 3:
|
||
base_sec_name = ".rodata";
|
||
break;
|
||
}
|
||
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
|
||
if (upper != NULL)
|
||
{
|
||
/* Can't just use one iteration over the all the sections to make
|
||
both lower->upper and upper->lower transformations because the
|
||
iterator encounters upper sections before all lower sections have
|
||
been examined. */
|
||
bfd *abfd;
|
||
|
||
if (placement_stage == LOWER_TO_UPPER)
|
||
{
|
||
/* Perform relaxation and get the final size of sections
|
||
before trying to fit .either sections in the correct
|
||
ouput sections. */
|
||
if (relax_count == 0)
|
||
{
|
||
intermediate_relax_sections ();
|
||
relax_count++;
|
||
}
|
||
for (abfd = link_info.input_bfds; abfd != NULL;
|
||
abfd = abfd->link.next)
|
||
{
|
||
bfd_map_over_sections (abfd, eval_lower_either_sections,
|
||
(void *) base_sec_name);
|
||
}
|
||
}
|
||
else if (placement_stage == UPPER_TO_LOWER)
|
||
{
|
||
/* Relax again before moving upper->lower. */
|
||
if (relax_count == 1)
|
||
{
|
||
intermediate_relax_sections ();
|
||
relax_count++;
|
||
}
|
||
for (abfd = link_info.input_bfds; abfd != NULL;
|
||
abfd = abfd->link.next)
|
||
{
|
||
bfd_map_over_sections (abfd, eval_upper_either_sections,
|
||
(void *) base_sec_name);
|
||
}
|
||
}
|
||
|
||
}
|
||
}
|
||
gld${EMULATION_NAME}_after_allocation ();
|
||
}
|
||
|
||
struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
|
||
{
|
||
${LDEMUL_BEFORE_PARSE-gld${EMULATION_NAME}_before_parse},
|
||
${LDEMUL_SYSLIB-syslib_default},
|
||
${LDEMUL_HLL-hll_default},
|
||
${LDEMUL_AFTER_PARSE-after_parse_default},
|
||
msp430_elf_after_open,
|
||
after_check_relocs_default,
|
||
msp430_elf_after_allocation,
|
||
${LDEMUL_SET_OUTPUT_ARCH-set_output_arch_default},
|
||
${LDEMUL_CHOOSE_TARGET-ldemul_default_target},
|
||
${LDEMUL_BEFORE_ALLOCATION-before_allocation_default},
|
||
${LDEMUL_GET_SCRIPT-gld${EMULATION_NAME}_get_script},
|
||
"${EMULATION_NAME}",
|
||
"${OUTPUT_FORMAT}",
|
||
${LDEMUL_FINISH-finish_default},
|
||
${LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS-NULL},
|
||
${LDEMUL_OPEN_DYNAMIC_ARCHIVE-NULL},
|
||
${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan},
|
||
${LDEMUL_SET_SYMBOLS-NULL},
|
||
${LDEMUL_PARSE_ARGS-NULL},
|
||
gld${EMULATION_NAME}_add_options,
|
||
gld${EMULATION_NAME}_handle_option,
|
||
${LDEMUL_UNRECOGNIZED_FILE-NULL},
|
||
gld${EMULATION_NAME}_list_options,
|
||
${LDEMUL_RECOGNIZED_FILE-NULL},
|
||
${LDEMUL_FIND_POTENTIAL_LIBRARIES-NULL},
|
||
${LDEMUL_NEW_VERS_PATTERN-NULL},
|
||
${LDEMUL_EXTRA_MAP_FILE_TEXT-NULL},
|
||
${LDEMUL_EMIT_CTF_EARLY-NULL},
|
||
${LDEMUL_EXAMINE_STRTAB_FOR_CTF-NULL}
|
||
};
|
||
EOF
|
||
#
|
||
# Local Variables:
|
||
# mode: c
|
||
# End:
|