mirror of
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97d40d3d4a
us up to version 2.17.50.20070703, at the last GPLv2 commit. Amongst others, this added upstream support for some FreeBSD-specific things that we previously had to manually hack in, such as the OSABI label support, and so on. There are also quite a number of new files, some for cpu's (e.g. SPU) that we may or may not be interested in, but those can be cleaned up later on, if needed.
629 lines
15 KiB
C
629 lines
15 KiB
C
/* ELF attributes support (based on ARM EABI attributes).
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Copyright 2005, 2006, 2007
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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 2 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, 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 & 1) && attr->i != 0)
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return FALSE;
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if ((attr->type & 2) && attr->s && *attr->s)
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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 (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 & 1)
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size += uleb128_size (attr->i);
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if (attr->type & 2)
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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 = 4; 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, 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 & 1)
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p = write_uleb128 (p, attr->i);
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if (attr->type & 2)
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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 = 4; i < NUM_KNOWN_OBJ_ATTRIBUTES; i++)
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p = write_obj_attribute (p, 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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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, 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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/* Knwon 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, 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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/* Knwon 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, 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 = 1;
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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 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, 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 = 2;
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attr->s = _bfd_elf_attr_strdup (abfd, s);
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}
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/* Add a Tag_compatibility object attribute. */
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void
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bfd_elf_add_obj_attr_compat (bfd *abfd, int vendor, unsigned int i,
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const char *s)
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{
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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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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_compatibility;
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list->attr.type = 3;
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list->attr.i = i;
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list->attr.s = _bfd_elf_attr_strdup (abfd, s);
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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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int cmp;
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if (p->tag != Tag_compatibility)
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break;
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cmp = strcmp(s, p->attr.s);
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if (cmp < 0 || (cmp == 0 && i < p->attr.i))
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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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}
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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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for (vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; vendor++)
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{
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in_attr = &elf_known_obj_attributes (ibfd)[vendor][4];
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out_attr = &elf_known_obj_attributes (obfd)[vendor][4];
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for (i = 4; 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)
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{
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case 1:
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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 2:
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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 3:
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bfd_elf_add_obj_attr_compat (obfd, vendor, in_attr->i,
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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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/* Determine whether a GNU object attribute tag takes an integer, a
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string or both. */
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static int
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gnu_obj_attrs_arg_type (int tag)
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{
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/* Except for Tag_compatibility, for GNU attributes we follow the
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same rule ARM ones > 32 follow: odd-numbered tags take strings
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and even-numbered tags take integers. In addition, tag & 2 is
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nonzero for architecture-independent tags and zero for
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architecture-dependent ones. */
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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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}
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/* Determine what arguments an attribute tag takes. */
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int
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_bfd_elf_obj_attrs_arg_type (bfd *abfd, int vendor, int tag)
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{
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switch (vendor)
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{
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case OBJ_ATTR_PROC:
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return get_elf_backend_data (abfd)->obj_attrs_arg_type (tag);
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break;
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case OBJ_ATTR_GNU:
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return gnu_obj_attrs_arg_type (tag);
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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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/* Parse an object attributes section. */
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void
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_bfd_elf_parse_attributes (bfd *abfd, Elf_Internal_Shdr * hdr)
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{
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bfd_byte *contents;
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bfd_byte *p;
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bfd_vma len;
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const char *std_section;
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contents = bfd_malloc (hdr->sh_size);
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if (!contents)
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return;
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if (!bfd_get_section_contents (abfd, hdr->bfd_section, contents, 0,
|
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hdr->sh_size))
|
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{
|
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free (contents);
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return;
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}
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p = contents;
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std_section = get_elf_backend_data (abfd)->obj_attrs_vendor;
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if (*(p++) == 'A')
|
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{
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len = hdr->sh_size - 1;
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while (len > 0)
|
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{
|
|
int namelen;
|
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bfd_vma section_len;
|
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int vendor;
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|
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section_len = bfd_get_32 (abfd, p);
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p += 4;
|
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if (section_len > len)
|
|
section_len = len;
|
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len -= section_len;
|
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namelen = strlen ((char *)p) + 1;
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section_len -= namelen + 4;
|
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if (std_section && strcmp ((char *)p, std_section) == 0)
|
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vendor = OBJ_ATTR_PROC;
|
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else if (strcmp ((char *)p, "gnu") == 0)
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vendor = OBJ_ATTR_GNU;
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else
|
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{
|
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/* Other vendor section. Ignore it. */
|
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p += namelen + section_len;
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continue;
|
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}
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|
|
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p += namelen;
|
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while (section_len > 0)
|
|
{
|
|
int tag;
|
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unsigned int n;
|
|
unsigned int val;
|
|
bfd_vma subsection_len;
|
|
bfd_byte *end;
|
|
|
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tag = read_unsigned_leb128 (abfd, p, &n);
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p += n;
|
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subsection_len = bfd_get_32 (abfd, p);
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p += 4;
|
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if (subsection_len > section_len)
|
|
subsection_len = section_len;
|
|
section_len -= subsection_len;
|
|
subsection_len -= n + 4;
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|
end = p + subsection_len;
|
|
switch (tag)
|
|
{
|
|
case Tag_File:
|
|
while (p < end)
|
|
{
|
|
int type;
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|
|
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tag = read_unsigned_leb128 (abfd, p, &n);
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p += n;
|
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type = _bfd_elf_obj_attrs_arg_type (abfd, vendor, tag);
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switch (type)
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{
|
|
case 3:
|
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val = read_unsigned_leb128 (abfd, p, &n);
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p += n;
|
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bfd_elf_add_obj_attr_compat (abfd, vendor, val,
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(char *)p);
|
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p += strlen ((char *)p) + 1;
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break;
|
|
case 2:
|
|
bfd_elf_add_obj_attr_string (abfd, vendor, tag,
|
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(char *)p);
|
|
p += strlen ((char *)p) + 1;
|
|
break;
|
|
case 1:
|
|
val = read_unsigned_leb128 (abfd, p, &n);
|
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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, bfd *obfd)
|
|
{
|
|
obj_attribute *in_attr;
|
|
obj_attribute *out_attr;
|
|
obj_attribute_list *in_list;
|
|
obj_attribute_list *out_list;
|
|
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++)
|
|
{
|
|
in_list = elf_other_obj_attributes (ibfd)[vendor];
|
|
out_list = elf_other_obj_attributes (ibfd)[vendor];
|
|
while (in_list && in_list->tag == Tag_compatibility)
|
|
{
|
|
in_attr = &in_list->attr;
|
|
if (in_attr->i == 0)
|
|
continue;
|
|
if (in_attr->i == 1 && strcmp (in_attr->s, "gnu") != 0)
|
|
{
|
|
_bfd_error_handler
|
|
(_("ERROR: %B: Must be processed by '%s' toolchain"),
|
|
ibfd, in_attr->s);
|
|
return FALSE;
|
|
}
|
|
if (!out_list || out_list->tag != Tag_compatibility
|
|
|| strcmp (in_attr->s, out_list->attr.s) != 0)
|
|
{
|
|
/* Add this compatibility tag to the output. */
|
|
bfd_elf_add_proc_attr_compat (obfd, in_attr->i, in_attr->s);
|
|
continue;
|
|
}
|
|
out_attr = &out_list->attr;
|
|
/* Check all the input tags with the same identifier. */
|
|
for (;;)
|
|
{
|
|
if (out_list->tag != Tag_compatibility
|
|
|| in_attr->i != out_attr->i
|
|
|| strcmp (in_attr->s, out_attr->s) != 0)
|
|
{
|
|
_bfd_error_handler
|
|
(_("ERROR: %B: Incompatible object tag '%s':%d"),
|
|
ibfd, in_attr->s, in_attr->i);
|
|
return FALSE;
|
|
}
|
|
in_list = in_list->next;
|
|
if (in_list->tag != Tag_compatibility
|
|
|| strcmp (in_attr->s, in_list->attr.s) != 0)
|
|
break;
|
|
in_attr = &in_list->attr;
|
|
out_list = out_list->next;
|
|
if (out_list)
|
|
out_attr = &out_list->attr;
|
|
}
|
|
|
|
/* Check the output doesn't have extra tags with this identifier. */
|
|
if (out_list && out_list->tag == Tag_compatibility
|
|
&& strcmp (in_attr->s, out_list->attr.s) == 0)
|
|
{
|
|
_bfd_error_handler
|
|
(_("ERROR: %B: Incompatible object tag '%s':%d"),
|
|
ibfd, in_attr->s, out_list->attr.i);
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|