8d2c8c3d17
.gnu.attributes entries from linker input files are merged to the output file, the output having the union of compatible input attributes. Incompatible attributes generally cause a linker error and no output. However in some cases only a warning is emitted, and one of the incompatible input attributes is passed on to the output. PowerPC tends to emit warnings rather than errors, and the output takes the first input attribute. For example, if we have two input files with Tag_GNU_Power_ABI_FP, the first with a value signifying "double-precision hard float, IBM long double", the second with a value signifying "double-precision hard float, IEEE long double", we'll get a warning about incompatible long double types and the output will say "double-precision hard float, IBM long double". The output attribute of course isn't correct. It would be correct to specify "IBM and IEEE long double", but we don't have a way to represent that currently. While it would be possible to extend the encoding, there isn't much gain in doing so. A shared library providing support for both long double types should link against objects using either long double type without warning or error. That is what you'd get if such a shared library had no Tag_GNU_Power_ABI_FP attribute. So this patch provides a way for the backend to omit .gnu.attributes tags from the output. * elf-bfd.h (ATTR_TYPE_FLAG_ERROR, ATTR_TYPE_HAS_ERROR): Define. * elf-attrs.c (is_default_attr): Handle ATTR_TYPE_HAS_ERROR. * elf32-ppc.c (_bfd_elf_ppc_merge_fp_attributes): Use ATTR_TYPE_FLAG_INT_VAL. Set ATTR_TYPE_HAS_ERROR on finding incompatible attribute. (ppc_elf_merge_obj_attributes): Likewise. Return _bfd_elf_merge_object_attributes result. * elf64-ppc.c (ppc64_elf_merge_private_bfd_data): Return _bfd_elf_merge_object_attributes result.
747 lines
20 KiB
C
747 lines
20 KiB
C
/* ELF attributes support (based on ARM EABI attributes).
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Copyright (C) 2005-2018 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libiberty.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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/* Return the number of bytes needed by I in uleb128 format. */
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static int
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uleb128_size (unsigned int i)
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{
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int size;
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size = 1;
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while (i >= 0x80)
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{
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i >>= 7;
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size++;
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}
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return size;
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}
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/* Return TRUE if the attribute has the default value (0/""). */
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static bfd_boolean
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is_default_attr (obj_attribute *attr)
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{
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if (ATTR_TYPE_HAS_ERROR (attr->type))
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return TRUE;
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if (ATTR_TYPE_HAS_INT_VAL (attr->type) && attr->i != 0)
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return FALSE;
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if (ATTR_TYPE_HAS_STR_VAL (attr->type) && attr->s && *attr->s)
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return FALSE;
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if (ATTR_TYPE_HAS_NO_DEFAULT (attr->type))
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return FALSE;
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return TRUE;
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}
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/* Return the size of a single attribute. */
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static bfd_vma
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obj_attr_size (unsigned int tag, obj_attribute *attr)
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{
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bfd_vma size;
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if (is_default_attr (attr))
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return 0;
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size = uleb128_size (tag);
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if (ATTR_TYPE_HAS_INT_VAL (attr->type))
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size += uleb128_size (attr->i);
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if (ATTR_TYPE_HAS_STR_VAL (attr->type))
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size += strlen ((char *)attr->s) + 1;
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return size;
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}
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/* Return the vendor name for a given object attributes section. */
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static const char *
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vendor_obj_attr_name (bfd *abfd, int vendor)
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{
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return (vendor == OBJ_ATTR_PROC
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? get_elf_backend_data (abfd)->obj_attrs_vendor
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: "gnu");
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}
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/* Return the size of the object attributes section for VENDOR
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(OBJ_ATTR_PROC or OBJ_ATTR_GNU), or 0 if there are no attributes
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for that vendor to record and the vendor is OBJ_ATTR_GNU. */
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static bfd_vma
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vendor_obj_attr_size (bfd *abfd, int vendor)
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{
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bfd_vma size;
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obj_attribute *attr;
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obj_attribute_list *list;
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int i;
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const char *vendor_name = vendor_obj_attr_name (abfd, vendor);
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if (!vendor_name)
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return 0;
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attr = elf_known_obj_attributes (abfd)[vendor];
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size = 0;
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for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
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size += obj_attr_size (i, &attr[i]);
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for (list = elf_other_obj_attributes (abfd)[vendor];
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list;
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list = list->next)
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size += obj_attr_size (list->tag, &list->attr);
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/* <size> <vendor_name> NUL 0x1 <size> */
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return ((size || vendor == OBJ_ATTR_PROC)
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? size + 10 + strlen (vendor_name)
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: 0);
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}
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/* Return the size of the object attributes section. */
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bfd_vma
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bfd_elf_obj_attr_size (bfd *abfd)
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{
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bfd_vma size;
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size = vendor_obj_attr_size (abfd, OBJ_ATTR_PROC);
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size += vendor_obj_attr_size (abfd, OBJ_ATTR_GNU);
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/* 'A' <sections for each vendor> */
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return (size ? size + 1 : 0);
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}
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/* Write VAL in uleb128 format to P, returning a pointer to the
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following byte. */
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static bfd_byte *
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write_uleb128 (bfd_byte *p, unsigned int val)
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{
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bfd_byte c;
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do
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{
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c = val & 0x7f;
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val >>= 7;
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if (val)
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c |= 0x80;
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*(p++) = c;
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}
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while (val);
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return p;
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}
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/* Write attribute ATTR to butter P, and return a pointer to the following
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byte. */
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static bfd_byte *
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write_obj_attribute (bfd_byte *p, unsigned int tag, obj_attribute *attr)
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{
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/* Suppress default entries. */
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if (is_default_attr (attr))
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return p;
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p = write_uleb128 (p, tag);
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if (ATTR_TYPE_HAS_INT_VAL (attr->type))
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p = write_uleb128 (p, attr->i);
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if (ATTR_TYPE_HAS_STR_VAL (attr->type))
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{
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int len;
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len = strlen (attr->s) + 1;
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memcpy (p, attr->s, len);
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p += len;
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}
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return p;
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}
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/* Write the contents of the object attributes section (length SIZE)
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for VENDOR to CONTENTS. */
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static void
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vendor_set_obj_attr_contents (bfd *abfd, bfd_byte *contents, bfd_vma size,
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int vendor)
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{
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bfd_byte *p;
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obj_attribute *attr;
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obj_attribute_list *list;
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int i;
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const char *vendor_name = vendor_obj_attr_name (abfd, vendor);
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size_t vendor_length = strlen (vendor_name) + 1;
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p = contents;
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bfd_put_32 (abfd, size, p);
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p += 4;
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memcpy (p, vendor_name, vendor_length);
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p += vendor_length;
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*(p++) = Tag_File;
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bfd_put_32 (abfd, size - 4 - vendor_length, p);
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p += 4;
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attr = elf_known_obj_attributes (abfd)[vendor];
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for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
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{
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unsigned int tag = i;
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if (get_elf_backend_data (abfd)->obj_attrs_order)
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tag = get_elf_backend_data (abfd)->obj_attrs_order (i);
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p = write_obj_attribute (p, tag, &attr[tag]);
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}
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for (list = elf_other_obj_attributes (abfd)[vendor];
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list;
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list = list->next)
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p = write_obj_attribute (p, list->tag, &list->attr);
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}
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/* Write the contents of the object attributes section to CONTENTS. */
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void
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bfd_elf_set_obj_attr_contents (bfd *abfd, bfd_byte *contents, bfd_vma size)
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{
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bfd_byte *p;
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int vendor;
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bfd_vma my_size;
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p = contents;
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*(p++) = 'A';
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my_size = 1;
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for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
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{
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bfd_vma vendor_size = vendor_obj_attr_size (abfd, vendor);
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if (vendor_size)
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vendor_set_obj_attr_contents (abfd, p, vendor_size, vendor);
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p += vendor_size;
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my_size += vendor_size;
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}
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if (size != my_size)
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abort ();
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}
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/* Allocate/find an object attribute. */
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static obj_attribute *
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elf_new_obj_attr (bfd *abfd, int vendor, unsigned int tag)
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{
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obj_attribute *attr;
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obj_attribute_list *list;
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obj_attribute_list *p;
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obj_attribute_list **lastp;
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if (tag < NUM_KNOWN_OBJ_ATTRIBUTES)
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{
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/* Known tags are preallocated. */
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attr = &elf_known_obj_attributes (abfd)[vendor][tag];
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}
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else
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{
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/* Create a new tag. */
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list = (obj_attribute_list *)
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bfd_alloc (abfd, sizeof (obj_attribute_list));
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memset (list, 0, sizeof (obj_attribute_list));
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list->tag = tag;
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/* Keep the tag list in order. */
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lastp = &elf_other_obj_attributes (abfd)[vendor];
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for (p = *lastp; p; p = p->next)
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{
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if (tag < p->tag)
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break;
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lastp = &p->next;
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}
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list->next = *lastp;
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*lastp = list;
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attr = &list->attr;
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}
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return attr;
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}
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/* Return the value of an integer object attribute. */
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int
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bfd_elf_get_obj_attr_int (bfd *abfd, int vendor, unsigned int tag)
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{
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obj_attribute_list *p;
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if (tag < NUM_KNOWN_OBJ_ATTRIBUTES)
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{
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/* Known tags are preallocated. */
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return elf_known_obj_attributes (abfd)[vendor][tag].i;
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}
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else
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{
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for (p = elf_other_obj_attributes (abfd)[vendor];
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p;
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p = p->next)
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{
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if (tag == p->tag)
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return p->attr.i;
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if (tag < p->tag)
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break;
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}
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return 0;
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}
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}
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/* Add an integer object attribute. */
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void
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bfd_elf_add_obj_attr_int (bfd *abfd, int vendor, unsigned int tag, unsigned int i)
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{
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obj_attribute *attr;
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attr = elf_new_obj_attr (abfd, vendor, tag);
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attr->type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
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attr->i = i;
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}
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/* Duplicate an object attribute string value. */
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char *
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_bfd_elf_attr_strdup (bfd *abfd, const char * s)
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{
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char * p;
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int len;
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len = strlen (s) + 1;
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p = (char *) bfd_alloc (abfd, len);
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return (char *) memcpy (p, s, len);
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}
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/* Add a string object attribute. */
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void
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bfd_elf_add_obj_attr_string (bfd *abfd, int vendor, unsigned int tag, const char *s)
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{
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obj_attribute *attr;
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attr = elf_new_obj_attr (abfd, vendor, tag);
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attr->type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
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attr->s = _bfd_elf_attr_strdup (abfd, s);
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}
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/* Add a int+string object attribute. */
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void
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bfd_elf_add_obj_attr_int_string (bfd *abfd, int vendor,
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unsigned int tag,
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unsigned int i, const char *s)
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{
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obj_attribute *attr;
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attr = elf_new_obj_attr (abfd, vendor, tag);
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attr->type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
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attr->i = i;
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attr->s = _bfd_elf_attr_strdup (abfd, s);
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}
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|
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/* Copy the object attributes from IBFD to OBFD. */
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void
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_bfd_elf_copy_obj_attributes (bfd *ibfd, bfd *obfd)
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{
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obj_attribute *in_attr;
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obj_attribute *out_attr;
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obj_attribute_list *list;
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int i;
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int vendor;
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if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
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|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
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return;
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for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
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{
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in_attr
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= &elf_known_obj_attributes (ibfd)[vendor][LEAST_KNOWN_OBJ_ATTRIBUTE];
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out_attr
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= &elf_known_obj_attributes (obfd)[vendor][LEAST_KNOWN_OBJ_ATTRIBUTE];
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for (i = LEAST_KNOWN_OBJ_ATTRIBUTE; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
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{
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out_attr->type = in_attr->type;
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out_attr->i = in_attr->i;
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if (in_attr->s && *in_attr->s)
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out_attr->s = _bfd_elf_attr_strdup (obfd, in_attr->s);
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in_attr++;
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out_attr++;
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}
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for (list = elf_other_obj_attributes (ibfd)[vendor];
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list;
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list = list->next)
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{
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in_attr = &list->attr;
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switch (in_attr->type & (ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL))
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{
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case ATTR_TYPE_FLAG_INT_VAL:
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bfd_elf_add_obj_attr_int (obfd, vendor, list->tag, in_attr->i);
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break;
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case ATTR_TYPE_FLAG_STR_VAL:
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bfd_elf_add_obj_attr_string (obfd, vendor, list->tag,
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in_attr->s);
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break;
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case ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL:
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bfd_elf_add_obj_attr_int_string (obfd, vendor, list->tag,
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in_attr->i, in_attr->s);
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break;
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default:
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abort ();
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}
|
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}
|
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}
|
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}
|
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|
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/* Determine whether a GNU object attribute tag takes an integer, a
|
|
string or both. */
|
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static int
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gnu_obj_attrs_arg_type (unsigned int tag)
|
|
{
|
|
/* Except for Tag_compatibility, for GNU attributes we follow the
|
|
same rule ARM ones > 32 follow: odd-numbered tags take strings
|
|
and even-numbered tags take integers. In addition, tag & 2 is
|
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nonzero for architecture-independent tags and zero for
|
|
architecture-dependent ones. */
|
|
if (tag == Tag_compatibility)
|
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return 3;
|
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else
|
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return (tag & 1) != 0 ? 2 : 1;
|
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}
|
|
|
|
/* Determine what arguments an attribute tag takes. */
|
|
int
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_bfd_elf_obj_attrs_arg_type (bfd *abfd, int vendor, unsigned int tag)
|
|
{
|
|
switch (vendor)
|
|
{
|
|
case OBJ_ATTR_PROC:
|
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return get_elf_backend_data (abfd)->obj_attrs_arg_type (tag);
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|
break;
|
|
case OBJ_ATTR_GNU:
|
|
return gnu_obj_attrs_arg_type (tag);
|
|
break;
|
|
default:
|
|
abort ();
|
|
}
|
|
}
|
|
|
|
/* Parse an object attributes section. */
|
|
void
|
|
_bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr)
|
|
{
|
|
bfd_byte *contents;
|
|
bfd_byte *p;
|
|
bfd_byte *p_end;
|
|
bfd_vma len;
|
|
const char *std_sec;
|
|
|
|
/* PR 17512: file: 2844a11d. */
|
|
if (hdr->sh_size == 0)
|
|
return;
|
|
if (hdr->sh_size > bfd_get_file_size (abfd))
|
|
{
|
|
/* xgettext:c-format */
|
|
_bfd_error_handler (_("%pB: error: attribute section '%pA' too big: %#llx"),
|
|
abfd, hdr->bfd_section, (long long) hdr->sh_size);
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return;
|
|
}
|
|
|
|
contents = (bfd_byte *) bfd_malloc (hdr->sh_size + 1);
|
|
if (!contents)
|
|
return;
|
|
if (!bfd_get_section_contents (abfd, hdr->bfd_section, contents, 0,
|
|
hdr->sh_size))
|
|
{
|
|
free (contents);
|
|
return;
|
|
}
|
|
/* Ensure that the buffer is NUL terminated. */
|
|
contents[hdr->sh_size] = 0;
|
|
p = contents;
|
|
p_end = p + hdr->sh_size;
|
|
std_sec = get_elf_backend_data (abfd)->obj_attrs_vendor;
|
|
|
|
if (*(p++) == 'A')
|
|
{
|
|
len = hdr->sh_size - 1;
|
|
|
|
while (len > 0 && p < p_end - 4)
|
|
{
|
|
unsigned namelen;
|
|
bfd_vma section_len;
|
|
int vendor;
|
|
|
|
section_len = bfd_get_32 (abfd, p);
|
|
p += 4;
|
|
if (section_len == 0)
|
|
break;
|
|
if (section_len > len)
|
|
section_len = len;
|
|
len -= section_len;
|
|
if (section_len <= 4)
|
|
{
|
|
_bfd_error_handler
|
|
(_("%pB: error: attribute section length too small: %" PRId64),
|
|
abfd, (int64_t) section_len);
|
|
break;
|
|
}
|
|
section_len -= 4;
|
|
namelen = strnlen ((char *) p, section_len) + 1;
|
|
if (namelen == 0 || namelen >= section_len)
|
|
break;
|
|
section_len -= namelen;
|
|
if (std_sec && strcmp ((char *) p, std_sec) == 0)
|
|
vendor = OBJ_ATTR_PROC;
|
|
else if (strcmp ((char *) p, "gnu") == 0)
|
|
vendor = OBJ_ATTR_GNU;
|
|
else
|
|
{
|
|
/* Other vendor section. Ignore it. */
|
|
p += namelen + section_len;
|
|
continue;
|
|
}
|
|
|
|
p += namelen;
|
|
while (section_len > 0 && p < p_end)
|
|
{
|
|
unsigned int tag;
|
|
unsigned int n;
|
|
unsigned int val;
|
|
bfd_vma subsection_len;
|
|
bfd_byte *end;
|
|
|
|
tag = _bfd_safe_read_leb128 (abfd, p, &n, FALSE, p_end);
|
|
p += n;
|
|
if (p < p_end - 4)
|
|
subsection_len = bfd_get_32 (abfd, p);
|
|
else
|
|
subsection_len = 0;
|
|
p += 4;
|
|
if (subsection_len == 0)
|
|
break;
|
|
if (subsection_len > section_len)
|
|
subsection_len = section_len;
|
|
section_len -= subsection_len;
|
|
subsection_len -= n + 4;
|
|
end = p + subsection_len;
|
|
/* PR 17512: file: 0e8c0c90. */
|
|
if (end > p_end)
|
|
end = p_end;
|
|
switch (tag)
|
|
{
|
|
case Tag_File:
|
|
while (p < end)
|
|
{
|
|
int type;
|
|
|
|
tag = _bfd_safe_read_leb128 (abfd, p, &n, FALSE, end);
|
|
p += n;
|
|
type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
|
|
switch (type & (ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL))
|
|
{
|
|
case ATTR_TYPE_FLAG_INT_VAL | ATTR_TYPE_FLAG_STR_VAL:
|
|
val = _bfd_safe_read_leb128 (abfd, p, &n, FALSE, end);
|
|
p += n;
|
|
bfd_elf_add_obj_attr_int_string (abfd, vendor, tag,
|
|
val, (char *) p);
|
|
p += strlen ((char *)p) + 1;
|
|
break;
|
|
case ATTR_TYPE_FLAG_STR_VAL:
|
|
bfd_elf_add_obj_attr_string (abfd, vendor, tag,
|
|
(char *) p);
|
|
p += strlen ((char *)p) + 1;
|
|
break;
|
|
case ATTR_TYPE_FLAG_INT_VAL:
|
|
val = _bfd_safe_read_leb128 (abfd, p, &n, FALSE, end);
|
|
p += n;
|
|
bfd_elf_add_obj_attr_int (abfd, vendor, tag, val);
|
|
break;
|
|
default:
|
|
abort ();
|
|
}
|
|
}
|
|
break;
|
|
case Tag_Section:
|
|
case Tag_Symbol:
|
|
/* Don't have anywhere convenient to attach these.
|
|
Fall through for now. */
|
|
default:
|
|
/* Ignore things we don't kow about. */
|
|
p += subsection_len;
|
|
subsection_len = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
free (contents);
|
|
}
|
|
|
|
/* Merge common object attributes from IBFD into OBFD. Raise an error
|
|
if there are conflicting attributes. Any processor-specific
|
|
attributes have already been merged. This must be called from the
|
|
bfd_elfNN_bfd_merge_private_bfd_data hook for each individual
|
|
target, along with any target-specific merging. Because there are
|
|
no common attributes other than Tag_compatibility at present, and
|
|
non-"gnu" Tag_compatibility is not expected in "gnu" sections, this
|
|
is not presently called for targets without their own
|
|
attributes. */
|
|
|
|
bfd_boolean
|
|
_bfd_elf_merge_object_attributes (bfd *ibfd, struct bfd_link_info *info)
|
|
{
|
|
bfd *obfd = info->output_bfd;
|
|
obj_attribute *in_attr;
|
|
obj_attribute *out_attr;
|
|
int vendor;
|
|
|
|
/* The only common attribute is currently Tag_compatibility,
|
|
accepted in both processor and "gnu" sections. */
|
|
for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
|
|
{
|
|
/* Handle Tag_compatibility. The tags are only compatible if the flags
|
|
are identical and, if the flags are '1', the strings are identical.
|
|
If the flags are non-zero, then we can only use the string "gnu". */
|
|
in_attr = &elf_known_obj_attributes (ibfd)[vendor][Tag_compatibility];
|
|
out_attr = &elf_known_obj_attributes (obfd)[vendor][Tag_compatibility];
|
|
|
|
if (in_attr->i > 0 && strcmp (in_attr->s, "gnu") != 0)
|
|
{
|
|
_bfd_error_handler
|
|
/* xgettext:c-format */
|
|
(_("error: %pB: object has vendor-specific contents that "
|
|
"must be processed by the '%s' toolchain"),
|
|
ibfd, in_attr->s);
|
|
return FALSE;
|
|
}
|
|
|
|
if (in_attr->i != out_attr->i
|
|
|| (in_attr->i != 0 && strcmp (in_attr->s, out_attr->s) != 0))
|
|
{
|
|
/* xgettext:c-format */
|
|
_bfd_error_handler (_("error: %pB: object tag '%d, %s' is "
|
|
"incompatible with tag '%d, %s'"),
|
|
ibfd,
|
|
in_attr->i, in_attr->s ? in_attr->s : "",
|
|
out_attr->i, out_attr->s ? out_attr->s : "");
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Merge an unknown processor-specific attribute TAG, within the range
|
|
of known attributes, from IBFD into OBFD; return TRUE if the link
|
|
is OK, FALSE if it must fail. */
|
|
|
|
bfd_boolean
|
|
_bfd_elf_merge_unknown_attribute_low (bfd *ibfd, bfd *obfd, int tag)
|
|
{
|
|
obj_attribute *in_attr;
|
|
obj_attribute *out_attr;
|
|
bfd *err_bfd = NULL;
|
|
bfd_boolean result = TRUE;
|
|
|
|
in_attr = elf_known_obj_attributes_proc (ibfd);
|
|
out_attr = elf_known_obj_attributes_proc (obfd);
|
|
|
|
if (out_attr[tag].i != 0 || out_attr[tag].s != NULL)
|
|
err_bfd = obfd;
|
|
else if (in_attr[tag].i != 0 || in_attr[tag].s != NULL)
|
|
err_bfd = ibfd;
|
|
|
|
if (err_bfd != NULL)
|
|
result
|
|
= get_elf_backend_data (err_bfd)->obj_attrs_handle_unknown (err_bfd, tag);
|
|
|
|
/* Only pass on attributes that match in both inputs. */
|
|
if (in_attr[tag].i != out_attr[tag].i
|
|
|| (in_attr[tag].s == NULL) != (out_attr[tag].s == NULL)
|
|
|| (in_attr[tag].s != NULL && out_attr[tag].s != NULL
|
|
&& strcmp (in_attr[tag].s, out_attr[tag].s) != 0))
|
|
{
|
|
out_attr[tag].i = 0;
|
|
out_attr[tag].s = NULL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Merge the lists of unknown processor-specific attributes, outside
|
|
the known range, from IBFD into OBFD; return TRUE if the link is
|
|
OK, FALSE if it must fail. */
|
|
|
|
bfd_boolean
|
|
_bfd_elf_merge_unknown_attribute_list (bfd *ibfd, bfd *obfd)
|
|
{
|
|
obj_attribute_list *in_list;
|
|
obj_attribute_list *out_list;
|
|
obj_attribute_list **out_listp;
|
|
bfd_boolean result = TRUE;
|
|
|
|
in_list = elf_other_obj_attributes_proc (ibfd);
|
|
out_listp = &elf_other_obj_attributes_proc (obfd);
|
|
out_list = *out_listp;
|
|
|
|
for (; in_list || out_list; )
|
|
{
|
|
bfd *err_bfd = NULL;
|
|
unsigned int err_tag = 0;
|
|
|
|
/* The tags for each list are in numerical order. */
|
|
/* If the tags are equal, then merge. */
|
|
if (out_list && (!in_list || in_list->tag > out_list->tag))
|
|
{
|
|
/* This attribute only exists in obfd. We can't merge, and we don't
|
|
know what the tag means, so delete it. */
|
|
err_bfd = obfd;
|
|
err_tag = out_list->tag;
|
|
*out_listp = out_list->next;
|
|
out_list = *out_listp;
|
|
}
|
|
else if (in_list && (!out_list || in_list->tag < out_list->tag))
|
|
{
|
|
/* This attribute only exists in ibfd. We can't merge, and we don't
|
|
know what the tag means, so ignore it. */
|
|
err_bfd = ibfd;
|
|
err_tag = in_list->tag;
|
|
in_list = in_list->next;
|
|
}
|
|
else /* The tags are equal. */
|
|
{
|
|
/* As present, all attributes in the list are unknown, and
|
|
therefore can't be merged meaningfully. */
|
|
err_bfd = obfd;
|
|
err_tag = out_list->tag;
|
|
|
|
/* Only pass on attributes that match in both inputs. */
|
|
if (in_list->attr.i != out_list->attr.i
|
|
|| (in_list->attr.s == NULL) != (out_list->attr.s == NULL)
|
|
|| (in_list->attr.s && out_list->attr.s
|
|
&& strcmp (in_list->attr.s, out_list->attr.s) != 0))
|
|
{
|
|
/* No match. Delete the attribute. */
|
|
*out_listp = out_list->next;
|
|
out_list = *out_listp;
|
|
}
|
|
else
|
|
{
|
|
/* Matched. Keep the attribute and move to the next. */
|
|
out_list = out_list->next;
|
|
in_list = in_list->next;
|
|
}
|
|
}
|
|
|
|
if (err_bfd)
|
|
result = result
|
|
&& get_elf_backend_data (err_bfd)->obj_attrs_handle_unknown (err_bfd,
|
|
err_tag);
|
|
}
|
|
|
|
return result;
|
|
}
|