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authorM R Swami Reddy <MR.Swami.Reddy@nsc.com>2008-11-27 12:41:14 +0000
committerM R Swami Reddy <MR.Swami.Reddy@nsc.com>2008-11-27 12:41:14 +0000
commit7251ccbfd71701f4f55c193a08ae0c148ce2649d (patch)
treed427010b95dbcc9e152beb569ab3e0b268ad2076 /ld
parent99706f3093b86ab5071023955eba76fef416b493 (diff)
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* 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. * NEWS: Add comment on cr16 new feature.
Diffstat (limited to 'ld')
-rw-r--r--ld/ChangeLog8
-rw-r--r--ld/NEWS3
-rw-r--r--ld/emulparams/elf32cr16.sh1
-rw-r--r--ld/emultempl/cr16elf.em114
4 files changed, 126 insertions, 0 deletions
diff --git a/ld/ChangeLog b/ld/ChangeLog
index e9cf92d..620997a 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -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
diff --git a/ld/NEWS b/ld/NEWS
index 962c2db..e838b4d 100644
--- a/ld/NEWS
+++ b/ld/NEWS
@@ -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.
diff --git a/ld/emulparams/elf32cr16.sh b/ld/emulparams/elf32cr16.sh
index 756d02b..bc9ae51 100644
--- a/ld/emulparams/elf32cr16.sh
+++ b/ld/emulparams/elf32cr16.sh
@@ -4,3 +4,4 @@ OUTPUT_FORMAT="elf32-cr16"
ARCH=cr16
ENTRY=_start
EXTRA_EM_FILE=cr16elf
+EMBEDDED=yes
diff --git a/ld/emultempl/cr16elf.em b/ld/emultempl/cr16elf.em
index fd1a2ed..22fe501 100644
--- a/ld/emultempl/cr16elf.em
+++ b/ld/emultempl/cr16elf.em
@@ -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