instruction. This option could be switched off by a linker switch. */
static int avr_replace_call_ret_sequences = 1;
\f
+
+/* Per-section relaxation related information for avr. */
+
+struct avr_relax_info
+{
+ /* Track the avr property records that apply to this section. */
+
+ struct
+ {
+ /* Number of records in the list. */
+ unsigned count;
+
+ /* How many records worth of space have we allocated. */
+ unsigned allocated;
+
+ /* The records, only COUNT records are initialised. */
+ struct avr_property_record *items;
+ } records;
+};
+
+/* Per section data, specialised for avr. */
+
+struct elf_avr_section_data
+{
+ /* The standard data must appear first. */
+ struct bfd_elf_section_data elf;
+
+ /* Relaxation related information. */
+ struct avr_relax_info relax_info;
+};
+
+/* Possibly initialise avr specific data for new section SEC from ABFD. */
+
+static bfd_boolean
+elf_avr_new_section_hook (bfd *abfd, asection *sec)
+{
+ if (!sec->used_by_bfd)
+ {
+ struct elf_avr_section_data *sdata;
+ bfd_size_type amt = sizeof (*sdata);
+
+ sdata = bfd_zalloc (abfd, amt);
+ if (sdata == NULL)
+ return FALSE;
+ sec->used_by_bfd = sdata;
+ }
+
+ return _bfd_elf_new_section_hook (abfd, sec);
+}
+
+/* Return a pointer to the relaxation information for SEC. */
+
+static struct avr_relax_info *
+get_avr_relax_info (asection *sec)
+{
+ struct elf_avr_section_data *section_data;
+
+ /* No info available if no section or if it is an output section. */
+ if (!sec || sec == sec->output_section)
+ return NULL;
+
+ section_data = (struct elf_avr_section_data *) elf_section_data (sec);
+ return §ion_data->relax_info;
+}
+
+/* Initialise the per section relaxation information for SEC. */
+
+static void
+init_avr_relax_info (asection *sec)
+{
+ struct avr_relax_info *relax_info = get_avr_relax_info (sec);
+
+ relax_info->records.count = 0;
+ relax_info->records.allocated = 0;
+ relax_info->records.items = NULL;
+}
+
/* Initialize an entry in the stub hash table. */
static struct bfd_hash_entry *
struct elf_link_hash_entry **sym_hashes;
struct elf_link_hash_entry **end_hashes;
unsigned int symcount;
+ struct avr_relax_info *relax_info;
+ struct avr_property_record *prop_record = NULL;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
contents = elf_section_data (sec)->this_hdr.contents;
+ relax_info = get_avr_relax_info (sec);
toaddr = sec->size;
+ if (relax_info->records.count > 0)
+ {
+ /* There should be no property record within the range of deleted
+ bytes, however, there might be a property record for ADDR, this is
+ how we handle alignment directives.
+ Find the next (if any) property record after the deleted bytes. */
+ unsigned int i;
+
+ for (i = 0; i < relax_info->records.count; ++i)
+ {
+ bfd_vma offset = relax_info->records.items [i].offset;
+
+ BFD_ASSERT (offset <= addr || offset >= (addr + count));
+ if (offset >= (addr + count))
+ {
+ prop_record = &relax_info->records.items [i];
+ toaddr = offset;
+ break;
+ }
+ }
+ }
+
irel = elf_section_data (sec)->relocs;
irelend = irel + sec->reloc_count;
if (toaddr - addr - count > 0)
memmove (contents + addr, contents + addr + count,
(size_t) (toaddr - addr - count));
- sec->size -= count;
+ if (prop_record == NULL)
+ sec->size -= count;
+ else
+ {
+ /* Use the property record to fill in the bytes we've opened up. */
+ int fill = 0;
+ switch (prop_record->type)
+ {
+ case RECORD_ORG_AND_FILL:
+ fill = prop_record->data.org.fill;
+ /* Fall through. */
+ case RECORD_ORG:
+ break;
+ case RECORD_ALIGN_AND_FILL:
+ fill = prop_record->data.align.fill;
+ /* Fall through. */
+ case RECORD_ALIGN:
+ prop_record->data.align.preceding_deleted += count;
+ break;
+ };
+ memset (contents + toaddr - count, fill, count);
+
+ /* Adjust the TOADDR to avoid moving symbols located at the address
+ of the property record, which has not moved. */
+ toaddr -= count;
+ }
/* Adjust all the reloc addresses. */
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
return offset;
}
+/* Iterate over the property records in R_LIST, and copy each record into
+ the list of records within the relaxation information for the section to
+ which the record applies. */
+
+static void
+avr_elf32_assign_records_to_sections (struct avr_property_record_list *r_list)
+{
+ unsigned int i;
+
+ for (i = 0; i < r_list->record_count; ++i)
+ {
+ struct avr_relax_info *relax_info;
+
+ relax_info = get_avr_relax_info (r_list->records [i].section);
+ BFD_ASSERT (relax_info != NULL);
+
+ if (relax_info->records.count
+ == relax_info->records.allocated)
+ {
+ /* Allocate more space. */
+ bfd_size_type size;
+
+ relax_info->records.allocated += 10;
+ size = (sizeof (struct avr_property_record)
+ * relax_info->records.allocated);
+ relax_info->records.items
+ = bfd_realloc (relax_info->records.items, size);
+ }
+
+ memcpy (&relax_info->records.items [relax_info->records.count],
+ &r_list->records [i],
+ sizeof (struct avr_property_record));
+ relax_info->records.count++;
+ }
+}
+
+/* Compare two STRUCT AVR_PROPERTY_RECORD in AP and BP, used as the
+ ordering callback from QSORT. */
+
+static int
+avr_property_record_compare (const void *ap, const void *bp)
+{
+ const struct avr_property_record *a
+ = (struct avr_property_record *) ap;
+ const struct avr_property_record *b
+ = (struct avr_property_record *) bp;
+
+ if (a->offset != b->offset)
+ return (a->offset - b->offset);
+
+ if (a->section != b->section)
+ return (bfd_get_section_vma (a->section->owner, a->section)
+ - bfd_get_section_vma (b->section->owner, b->section));
+
+ return (a->type - b->type);
+}
+
+/* Load all of the avr property sections from all of the bfd objects
+ referenced from LINK_INFO. All of the records within each property
+ section are assigned to the STRUCT AVR_RELAX_INFO within the section
+ specific data of the appropriate section. */
+
+static void
+avr_load_all_property_sections (struct bfd_link_info *link_info)
+{
+ bfd *abfd;
+ asection *sec;
+
+ /* Initialize the per-section relaxation info. */
+ for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
+ for (sec = abfd->sections; sec != NULL; sec = sec->next)
+ {
+ init_avr_relax_info (sec);
+ }
+
+ /* Load the descriptor tables from .avr.prop sections. */
+ for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
+ {
+ struct avr_property_record_list *r_list;
+
+ r_list = avr_elf32_load_property_records (abfd);
+ if (r_list != NULL)
+ avr_elf32_assign_records_to_sections (r_list);
+
+ free (r_list);
+ }
+
+ /* Now, for every section, ensure that the descriptor list in the
+ relaxation data is sorted by ascending offset within the section. */
+ for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next)
+ for (sec = abfd->sections; sec != NULL; sec = sec->next)
+ {
+ struct avr_relax_info *relax_info = get_avr_relax_info (sec);
+ if (relax_info && relax_info->records.count > 0)
+ {
+ unsigned int i;
+
+ qsort (relax_info->records.items,
+ relax_info->records.count,
+ sizeof (struct avr_property_record),
+ avr_property_record_compare);
+
+ /* For debug purposes, list all the descriptors. */
+ for (i = 0; i < relax_info->records.count; ++i)
+ {
+ switch (relax_info->records.items [i].type)
+ {
+ case RECORD_ORG:
+ break;
+ case RECORD_ORG_AND_FILL:
+ break;
+ case RECORD_ALIGN:
+ break;
+ case RECORD_ALIGN_AND_FILL:
+ break;
+ };
+ }
+ }
+ }
+}
+
/* This function handles relaxing for the avr.
Many important relaxing opportunities within functions are already
realized by the compiler itself.
bfd_byte *contents = NULL;
Elf_Internal_Sym *isymbuf = NULL;
struct elf32_avr_link_hash_table *htab;
+ static bfd_boolean relaxation_initialised = FALSE;
+
+ if (!relaxation_initialised)
+ {
+ relaxation_initialised = TRUE;
+
+ /* Load entries from the .avr.prop sections. */
+ avr_load_all_property_sections (link_info);
+ }
/* If 'shrinkable' is FALSE, do not shrink by deleting bytes while
relaxing. Such shrinking can cause issues for the sections such
}
}
+ if (!*again)
+ {
+ /* Look through all the property records in this section to see if
+ there's any alignment records that can be moved. */
+ struct avr_relax_info *relax_info;
+
+ relax_info = get_avr_relax_info (sec);
+ if (relax_info->records.count > 0)
+ {
+ unsigned int i;
+
+ for (i = 0; i < relax_info->records.count; ++i)
+ {
+ switch (relax_info->records.items [i].type)
+ {
+ case RECORD_ORG:
+ case RECORD_ORG_AND_FILL:
+ break;
+ case RECORD_ALIGN:
+ case RECORD_ALIGN_AND_FILL:
+ {
+ struct avr_property_record *record;
+ unsigned long bytes_to_align;
+ int count = 0;
+
+ /* Look for alignment directives that have had enough
+ bytes deleted before them, such that the directive
+ can be moved backwards and still maintain the
+ required alignment. */
+ record = &relax_info->records.items [i];
+ bytes_to_align
+ = (unsigned long) (1 << record->data.align.bytes);
+ while (record->data.align.preceding_deleted >=
+ bytes_to_align)
+ {
+ record->data.align.preceding_deleted
+ -= bytes_to_align;
+ count += bytes_to_align;
+ }
+
+ if (count > 0)
+ {
+ bfd_vma addr = record->offset;
+
+ /* We can delete COUNT bytes and this alignment
+ directive will still be correctly aligned.
+ First move the alignment directive, then delete
+ the bytes. */
+ record->offset -= count;
+ elf32_avr_relax_delete_bytes (abfd, sec,
+ addr - count,
+ count);
+ *again = TRUE;
+ }
+ }
+ break;
+ }
+ }
+ }
+ }
+
if (contents != NULL
&& elf_section_data (sec)->this_hdr.contents != contents)
{
#define bfd_elf32_bfd_relax_section elf32_avr_relax_section
#define bfd_elf32_bfd_get_relocated_section_contents \
elf32_avr_get_relocated_section_contents
+#define bfd_elf32_new_section_hook elf_avr_new_section_hook
#include "elf32-target.h"
projects / binutils-gdb.git / commitdiff