unsigned char removed : 1;
unsigned char make_relative : 1;
unsigned char make_lsda_relative : 1;
+ unsigned char per_encoding_relative : 1;
};
struct eh_frame_sec_info
bfd *abfd;
struct bfd_link_info *info;
asection *sec, *ehdrsec;
- boolean (*reloc_symbol_deleted_p) (bfd_vma, PTR);
+ boolean (*reloc_symbol_deleted_p) PARAMS ((bfd_vma, PTR));
struct elf_reloc_cookie *cookie;
{
bfd_byte *ehbuf = NULL, *buf;
= cie.make_relative;
sec_info->entry[last_cie_ndx].make_lsda_relative
= cie.make_lsda_relative;
+ sec_info->entry[last_cie_ndx].per_encoding_relative
+ = (cie.per_encoding & 0x70) == DW_EH_PE_pcrel;
}
}
}
read_uleb128 (cie.code_align, buf);
read_sleb128 (cie.data_align, buf);
+ /* Note - in DWARF2 the return address column is an unsigned byte.
+ In DWARF3 it is a ULEB128. We are following DWARF3. For most
+ ports this will not matter as the value will be less than 128.
+ For the others (eg FRV, SH, MMIX, IA64) they need a fixed GCC
+ which conforms to the DWARF3 standard. */
read_uleb128 (cie.ra_column, buf);
ENSURE_NO_RELOCS (buf);
cie.lsda_encoding = DW_EH_PE_omit;
}
/* For shared libraries, try to get rid of as many RELATIVE relocs
- as possible.
- FIXME: For this to work, ELF backends need to perform the
- relocation if omitting dynamic relocs, not skip it. */
- if (0
- && info->shared
+ as possible. */
+ if (info->shared
&& (cie.fde_encoding & 0xf0) == DW_EH_PE_absptr)
cie.make_relative = 1;
- if (0
- && info->shared
+ if (info->shared
&& (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr)
cie.make_lsda_relative = 1;
goto free_no_table;
if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie))
{
- cookie->rel = rel;
/* This is a FDE against discarded section, it should
be deleted. */
new_size -= hdr.length + 4;
sec_info->entry[sec_info->count].removed = 1;
+ memset (rel, 0, sizeof (*rel));
}
else
{
+ if (info->shared
+ && (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr
+ && cie.make_relative == 0)
+ || (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned))
+ {
+ /* If shared library uses absolute pointers
+ which we cannot turn into PC relative,
+ don't create the binary search table,
+ since it is affected by runtime relocations. */
+ hdr_info->table = false;
+ }
cie_usage_count++;
hdr_info->fde_count++;
}
{
sec_info->entry[i].make_relative = make_relative;
sec_info->entry[i].make_lsda_relative = make_lsda_relative;
+ sec_info->entry[i].per_encoding_relative = 0;
}
}
else if (sec_info->entry[i].cie && sec_info->entry[i].sec == sec)
struct eh_frame_hdr_info *hdr_info;
sec = bfd_get_section_by_name (elf_hash_table (info)->dynobj, ".eh_frame_hdr");
- if (sec == NULL)
+ if (sec == NULL || bfd_is_abs_section (sec->output_section))
return true;
hdr_info
/* Count only sections which have at least a single CIE or FDE.
There cannot be any CIE or FDE <= 8 bytes. */
o = bfd_get_section_by_name (abfd, ".eh_frame");
- if (o && o->_raw_size > 8)
+ if (o && o->_raw_size > 8 && !bfd_is_abs_section (o->output_section))
break;
}
if (sec_info->entry[mid].make_relative
&& ! sec_info->entry[mid].cie
&& offset == sec_info->entry[mid].offset + 8)
- return (bfd_vma) -1;
+ return (bfd_vma) -2;
/* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need
for run-time relocation against LSDA field. */
&& (offset
== (sec_info->entry[mid].offset + 8
+ sec_info->entry[mid].lsda_offset)))
- return (bfd_vma) -1;
+ return (bfd_vma) -2;
return (offset + sec_info->entry[mid].new_offset
- sec_info->entry[mid].offset);
/* CIE */
cie_offset = sec_info->entry[i].new_offset;
if (sec_info->entry[i].make_relative
- || sec_info->entry[i].make_lsda_relative)
+ || sec_info->entry[i].make_lsda_relative
+ || sec_info->entry[i].per_encoding_relative)
{
unsigned char *aug;
unsigned int action;
/* Need to find 'R' or 'L' augmentation's argument and modify
DW_EH_PE_* value. */
action = (sec_info->entry[i].make_relative ? 1 : 0)
- | (sec_info->entry[i].make_lsda_relative ? 2 : 0);
+ | (sec_info->entry[i].make_lsda_relative ? 2 : 0)
+ | (sec_info->entry[i].per_encoding_relative ? 4 : 0);
buf = contents + sec_info->entry[i].offset;
/* Skip length, id and version. */
buf += 9;
per_width = get_DW_EH_PE_width (per_encoding,
ptr_size);
BFD_ASSERT (per_width != 0);
+ BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel)
+ == sec_info->entry[i].per_encoding_relative);
if ((per_encoding & 0xf0) == DW_EH_PE_aligned)
buf = (contents
+ ((buf - contents + per_width - 1)
& ~((bfd_size_type) per_width - 1)));
+ if (action & 4)
+ {
+ bfd_vma value;
+
+ value = read_value (abfd, buf, per_width);
+ value += (sec_info->entry[i].offset
+ - sec_info->entry[i].new_offset);
+ write_value (abfd, buf, value, per_width);
+ action &= ~4;
+ }
buf += per_width;
break;
case 'R':
}
}
}
- else
+ else if (sec_info->entry[i].size > 4)
{
/* FDE */
bfd_vma value = 0, address;
}
}
}
+ else
+ /* Terminating FDE must be at the end of .eh_frame section only. */
+ BFD_ASSERT (i == sec_info->count - 1);
BFD_ASSERT (p == contents + sec_info->entry[i].new_offset);
memmove (p, contents + sec_info->entry[i].offset,
projects / binutils-gdb.git / blobdiff