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* emultempl/cr16elf.em (cr16_after_open): New function to handle

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CR16 ELF embedded reloc creation (ld --embedded-relocs).
        (check_sections): New function.
        (LDEMUL_AFTER_OPEN): Define.
        * emulparams/elf32cr16.sh (EMBEDDED): Define.
	* NEWS: Add comment on cr16 new feature.
This commit is contained in:
M R Swami Reddy 2008-11-27 12:41:14 +00:00
parent 99706f3093
commit 7251ccbfd7
4 changed files with 126 additions and 0 deletions
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8
ld/ChangeLog
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@ -1,3 +1,11 @@
2008-11-27 M R Swami Reddy <MR.Swami.Reddy@nsc.com>
* emultempl/cr16elf.em (cr16_after_open): New function to handle
CR16 ELF embedded reloc creation (ld --embedded-relocs).
(check_sections): New function.
(LDEMUL_AFTER_OPEN): Define.
* emulparams/elf32cr16.sh (EMBEDDED): Define.
2008-11-26 Alan Modra <amodra@bigpond.net.au>
PR 7047

3
ld/NEWS
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@ -1,5 +1,8 @@
-*- text -*-
* Add CR16 ELF --embedded-relocs (used to embedded relocations into binaries
for Embedded-PIC code) option.
* Add to the PE/PE+ targets the support of two different kinds of
pseudo-relocations. They can be selected by the switches
--enable-runtime-pseudo-reloc-v1 and --enable-runtime-pseudo-reloc-v2.

1
ld/emulparams/elf32cr16.sh
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@ -4,3 +4,4 @@ OUTPUT_FORMAT="elf32-cr16"
ARCH=cr16
ENTRY=_start
EXTRA_EM_FILE=cr16elf
EMBEDDED=yes

114
ld/emultempl/cr16elf.em
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@ -30,6 +30,84 @@ fragment <<EOF
/* Flag for the emulation-specific "--no-relax" option. */
static bfd_boolean disable_relaxation = FALSE;
static void check_sections (bfd *, asection *, void *);
/* This function is run after all the input files have been opened. */
static void
cr16_elf_after_open (void)
{
/* Call the standard elf routine. */
gld${EMULATION_NAME}_after_open ();
if (command_line.embedded_relocs
&& (! link_info.relocatable))
{
bfd *abfd;
/* In the embedded relocs mode we create a .emreloc section for each
input file with a nonzero .data section. The BFD backend will fill in
these sections with magic numbers which can be used to relocate the
data section at run time. */
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
{
asection *datasec;
/* As first-order business, make sure that each input BFD is either
COFF or ELF. We need to call a special BFD backend function to
generate the embedded relocs, and we have such functions only for
COFF and ELF. */
if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
&& bfd_get_flavour (abfd) != bfd_target_elf_flavour)
einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n");
datasec = bfd_get_section_by_name (abfd, ".data.rel");
/* Note that we assume that the reloc_count field has already
been set up. We could call bfd_get_reloc_upper_bound, but
that returns the size of a memory buffer rather than a reloc
count. We do not want to call bfd_canonicalize_reloc,
because although it would always work it would force us to
read in the relocs into BFD canonical form, which would waste
a significant amount of time and memory. */
if (datasec != NULL && datasec->reloc_count > 0)
{
asection *relsec;
relsec = bfd_make_section (abfd, ".emreloc");
if (relsec == NULL
|| ! bfd_set_section_flags (abfd, relsec,
(SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY))
|| ! bfd_set_section_alignment (abfd, relsec, 2)
|| ! bfd_set_section_size (abfd, relsec,
datasec->reloc_count * 8))
einfo ("%F%B: can not create .emreloc section: %E\n");
}
/* Double check that all other data sections are empty, as is
required for embedded PIC code. */
bfd_map_over_sections (abfd, check_sections, datasec);
}
}
}
/* Check that of the data sections, only the .data section has
relocs. This is called via bfd_map_over_sections. */
static void
check_sections (bfd *abfd, asection *sec, void *datasec)
{
if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0)
&& sec != datasec
&& sec->reloc_count == 0 )
einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
abfd, bfd_get_section_name (abfd, sec));
}
static void
cr16elf_after_parse (void)
{
@ -54,6 +132,41 @@ cr16elf_before_allocation (void)
/* Call the default first. */
gld${EMULATION_NAME}_before_allocation ();
if (command_line.embedded_relocs
&& (! link_info.relocatable))
{
bfd *abfd;
/* If we are generating embedded relocs, call a special BFD backend
routine to do the work. */
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
{
asection *datasec, *relsec;
char *errmsg;
datasec = bfd_get_section_by_name (abfd, ".data.rel");
if (datasec == NULL || datasec->reloc_count == 0)
continue;
relsec = bfd_get_section_by_name (abfd, ".emreloc");
ASSERT (relsec != NULL);
if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,
datasec, relsec,
&errmsg))
{
if (errmsg == NULL)
einfo ("%B%X: can not create runtime reloc information: %E\n",
abfd);
else
einfo ("%X%B: can not create runtime reloc information: %s\n",
abfd, errmsg);
}
}
}
/* Enable relaxation by default if the "--no-relax" option was not
specified. This is done here instead of in the before_parse hook
because there is a check in main() to prohibit use of --relax and
@ -88,5 +201,6 @@ PARSE_AND_LIST_ARGS_CASES='
# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_AFTER_OPEN=cr16_elf_after_open
LDEMUL_AFTER_PARSE=cr16elf_after_parse
LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation