562 lines
14 KiB
C
562 lines
14 KiB
C
/* ARC-specific support for 32-bit ELF
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Copyright (C) 1994-2022 Free Software Foundation, Inc.
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Contributed by Cupertino Miranda (cmiranda@synopsys.com).
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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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#ifndef ARC_GOT_H
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#define ARC_GOT_H
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#define TCB_SIZE (8)
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#define align_power(addr, align) \
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(((addr) + ((bfd_vma) 1 << (align)) - 1) & (-((bfd_vma) 1 << (align))))
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enum tls_type_e
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{
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GOT_UNKNOWN = 0,
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GOT_NORMAL,
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GOT_TLS_GD,
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GOT_TLS_IE,
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GOT_TLS_LE
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};
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enum tls_got_entries
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{
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TLS_GOT_NONE = 0,
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TLS_GOT_MOD,
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TLS_GOT_OFF,
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TLS_GOT_MOD_AND_OFF
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};
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struct got_entry
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{
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struct got_entry *next;
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enum tls_type_e type;
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bfd_vma offset;
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bool processed;
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bool created_dyn_relocation;
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enum tls_got_entries existing_entries;
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};
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/* Return the local got list, if not defined, create an empty one. */
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static struct got_entry **
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arc_get_local_got_ents (bfd * abfd)
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{
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if (elf_local_got_ents (abfd) == NULL)
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{
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bfd_size_type amt = (elf_tdata (abfd)->symtab_hdr.sh_info
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* sizeof (*elf_local_got_ents (abfd)));
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elf_local_got_ents (abfd) = bfd_zmalloc (amt);
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if (elf_local_got_ents (abfd) == NULL)
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{
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_bfd_error_handler (_("%pB: cannot allocate memory for local "
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"GOT entries"), abfd);
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bfd_set_error (bfd_error_bad_value);
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return NULL;
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}
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}
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return elf_local_got_ents (abfd);
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}
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static struct got_entry *
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got_entry_for_type (struct got_entry **list,
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enum tls_type_e type)
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{
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struct got_entry **p = list;
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while (*p != NULL)
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{
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if ((*p)->type == type)
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return *p;
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p = &((*p)->next);
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}
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return NULL;
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}
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static void
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new_got_entry_to_list (struct got_entry **list,
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enum tls_type_e type,
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bfd_vma offset,
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enum tls_got_entries existing_entries)
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{
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/* Find list end. Avoid having multiple entries of the same
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type. */
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struct got_entry **p = list;
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struct got_entry *entry;
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while (*p != NULL)
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{
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if ((*p)->type == type)
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return;
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p = &((*p)->next);
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}
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entry = (struct got_entry *) xmalloc (sizeof (struct got_entry));
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entry->type = type;
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entry->offset = offset;
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entry->next = NULL;
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entry->processed = false;
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entry->created_dyn_relocation = false;
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entry->existing_entries = existing_entries;
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ARC_DEBUG ("New GOT got entry added to list: "
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"type: %d, offset: %ld, existing_entries: %d\n",
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type, (long) offset, existing_entries);
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/* Add the entry to the end of the list. */
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*p = entry;
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}
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static enum tls_type_e
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tls_type_for_reloc (reloc_howto_type *howto)
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{
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enum tls_type_e ret = GOT_UNKNOWN;
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if (is_reloc_for_GOT (howto))
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return GOT_NORMAL;
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switch (howto->type)
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{
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case R_ARC_TLS_GD_GOT:
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ret = GOT_TLS_GD;
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break;
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case R_ARC_TLS_IE_GOT:
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ret = GOT_TLS_IE;
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break;
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case R_ARC_TLS_LE_32:
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ret = GOT_TLS_LE;
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break;
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default:
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ret = GOT_UNKNOWN;
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break;
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}
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return ret;
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};
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static struct got_entry **
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get_got_entry_list_for_symbol (bfd *abfd,
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unsigned long r_symndx,
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struct elf_link_hash_entry *h)
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{
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struct elf_arc_link_hash_entry *h1 =
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((struct elf_arc_link_hash_entry *) h);
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if (h1 != NULL)
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{
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return &h1->got_ents;
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}
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else
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{
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return arc_get_local_got_ents (abfd) + r_symndx;
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}
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}
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static enum tls_type_e
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arc_got_entry_type_for_reloc (reloc_howto_type *howto)
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{
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enum tls_type_e type = GOT_UNKNOWN;
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if (is_reloc_for_GOT (howto))
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return GOT_NORMAL;
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if (is_reloc_for_TLS (howto))
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{
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switch (howto->type)
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{
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case R_ARC_TLS_GD_GOT:
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type = GOT_TLS_GD;
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break;
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case R_ARC_TLS_IE_GOT:
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type = GOT_TLS_IE;
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break;
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default:
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break;
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}
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}
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return type;
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}
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#define ADD_SYMBOL_REF_SEC_AND_RELOC(SECNAME, COND_FOR_RELOC, H) \
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htab->s##SECNAME->size; \
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{ \
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if (COND_FOR_RELOC) \
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{ \
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htab->srel##SECNAME->size += sizeof (Elf32_External_Rela); \
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ARC_DEBUG ("arc_info: Added reloc space in " \
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#SECNAME " section at " __FILE__ \
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":%d for symbol %s\n", \
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__LINE__, name_for_global_symbol (H)); \
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} \
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if (H) \
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if (H->dynindx == -1 && !H->forced_local) \
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if (! bfd_elf_link_record_dynamic_symbol (info, H)) \
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return false; \
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htab->s##SECNAME->size += 4; \
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} \
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static bool
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arc_fill_got_info_for_reloc (enum tls_type_e type,
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struct got_entry **list,
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struct bfd_link_info * info,
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struct elf_link_hash_entry *h)
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{
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struct elf_link_hash_table *htab = elf_hash_table (info);
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if (got_entry_for_type (list, type) != NULL)
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return true;
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switch (type)
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{
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case GOT_NORMAL:
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{
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bfd_vma offset
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= ADD_SYMBOL_REF_SEC_AND_RELOC (got, bfd_link_pic (info)
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|| h != NULL, h);
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new_got_entry_to_list (list, type, offset, TLS_GOT_NONE);
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}
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break;
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case GOT_TLS_GD:
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{
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bfd_vma offset
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= ADD_SYMBOL_REF_SEC_AND_RELOC (got, true, h);
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bfd_vma ATTRIBUTE_UNUSED notneeded
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= ADD_SYMBOL_REF_SEC_AND_RELOC (got, true, h);
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new_got_entry_to_list (list, type, offset, TLS_GOT_MOD_AND_OFF);
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}
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break;
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case GOT_TLS_IE:
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case GOT_TLS_LE:
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{
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bfd_vma offset
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= ADD_SYMBOL_REF_SEC_AND_RELOC (got, true, h);
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new_got_entry_to_list (list, type, offset, TLS_GOT_OFF);
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}
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break;
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default:
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return false;
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break;
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}
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return true;
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}
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struct arc_static_sym_data {
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bfd_vma sym_value;
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const char *symbol_name;
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};
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static struct arc_static_sym_data
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get_static_sym_data (unsigned long r_symndx,
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Elf_Internal_Sym *local_syms,
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asection **local_sections,
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struct elf_link_hash_entry *h,
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struct arc_relocation_data *reloc_data)
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{
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static const char local_name[] = "(local)";
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struct arc_static_sym_data ret = { 0, NULL };
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if (h != NULL)
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{
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BFD_ASSERT (h->root.type != bfd_link_hash_undefweak
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&& h->root.type != bfd_link_hash_undefined);
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/* TODO: This should not be here. */
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reloc_data->sym_value = h->root.u.def.value;
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reloc_data->sym_section = h->root.u.def.section;
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ret.sym_value = h->root.u.def.value
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+ h->root.u.def.section->output_section->vma
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+ h->root.u.def.section->output_offset;
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ret.symbol_name = h->root.root.string;
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}
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else
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{
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Elf_Internal_Sym *sym = local_syms + r_symndx;
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asection *sec = local_sections[r_symndx];
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ret.sym_value = sym->st_value
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+ sec->output_section->vma
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+ sec->output_offset;
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ret.symbol_name = local_name;
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}
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return ret;
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}
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static bfd_vma
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relocate_fix_got_relocs_for_got_info (struct got_entry ** list_p,
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enum tls_type_e type,
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struct bfd_link_info * info,
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bfd * output_bfd,
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unsigned long r_symndx,
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Elf_Internal_Sym * local_syms,
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asection ** local_sections,
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struct elf_link_hash_entry * h,
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struct arc_relocation_data * reloc_data)
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{
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struct elf_link_hash_table *htab = elf_hash_table (info);
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struct got_entry *entry = NULL;
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if (list_p == NULL || type == GOT_UNKNOWN || type == GOT_TLS_LE)
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return 0;
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entry = got_entry_for_type (list_p, type);
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BFD_ASSERT (entry);
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if (h == NULL
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|| h->forced_local == true
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|| (! elf_hash_table (info)->dynamic_sections_created
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|| (bfd_link_pic (info)
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&& SYMBOL_REFERENCES_LOCAL (info, h))))
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{
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const char ATTRIBUTE_UNUSED *symbol_name;
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asection *tls_sec = elf_hash_table (info)->tls_sec;
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if (entry && !entry->processed)
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{
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switch (entry->type)
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{
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case GOT_TLS_GD:
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{
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BFD_ASSERT (tls_sec && tls_sec->output_section);
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bfd_vma sec_vma = tls_sec->output_section->vma;
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if (h == NULL || h->forced_local
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|| !elf_hash_table (info)->dynamic_sections_created)
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{
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struct arc_static_sym_data tmp =
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get_static_sym_data (r_symndx, local_syms, local_sections,
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h, reloc_data);
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bfd_put_32 (output_bfd,
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tmp.sym_value - sec_vma
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+ (elf_hash_table (info)->dynamic_sections_created
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? 0
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: (align_power (0,
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tls_sec->alignment_power))),
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htab->sgot->contents + entry->offset
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+ (entry->existing_entries == TLS_GOT_MOD_AND_OFF
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? 4 : 0));
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ARC_DEBUG ("arc_info: FIXED -> %s value = %#lx "
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"@ %lx, for symbol %s\n",
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(entry->type == GOT_TLS_GD ? "GOT_TLS_GD" :
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"GOT_TLS_IE"),
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(long) (sym_value - sec_vma),
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(long) (htab->sgot->output_section->vma
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+ htab->sgot->output_offset
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+ entry->offset
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+ (entry->existing_entries == TLS_GOT_MOD_AND_OFF
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? 4 : 0)),
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tmp.symbol_name);
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}
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}
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break;
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case GOT_TLS_IE:
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{
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BFD_ASSERT (tls_sec && tls_sec->output_section);
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bfd_vma ATTRIBUTE_UNUSED sec_vma
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= tls_sec->output_section->vma;
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struct arc_static_sym_data tmp =
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get_static_sym_data (r_symndx, local_syms, local_sections,
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h, reloc_data);
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bfd_put_32 (output_bfd,
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tmp.sym_value - sec_vma
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+ (elf_hash_table (info)->dynamic_sections_created
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? 0
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: (align_power (TCB_SIZE,
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tls_sec->alignment_power))),
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htab->sgot->contents + entry->offset
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+ (entry->existing_entries == TLS_GOT_MOD_AND_OFF
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? 4 : 0));
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ARC_DEBUG ("arc_info: FIXED -> %s value = %#lx "
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"@ %p, for symbol %s\n",
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(entry->type == GOT_TLS_GD ? "GOT_TLS_GD" :
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"GOT_TLS_IE"),
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(long) (sym_value - sec_vma),
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(long) (htab->sgot->output_section->vma
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+ htab->sgot->output_offset
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+ entry->offset
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+ (entry->existing_entries == TLS_GOT_MOD_AND_OFF
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? 4 : 0)),
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tmp.symbol_name);
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}
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break;
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case GOT_NORMAL:
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{
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bfd_vma sec_vma
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= reloc_data->sym_section->output_section->vma
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+ reloc_data->sym_section->output_offset;
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if (h != NULL
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&& h->root.type == bfd_link_hash_undefweak)
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ARC_DEBUG ("arc_info: PATCHED: NOT_PATCHED "
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"@ %#08lx for sym %s in got offset %#lx "
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"(is undefweak)\n",
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(long) (htab->sgot->output_section->vma
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+ htab->sgot->output_offset
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+ entry->offset),
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symbol_name,
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(long) entry->offset);
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else
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{
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bfd_put_32 (output_bfd,
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reloc_data->sym_value + sec_vma,
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htab->sgot->contents + entry->offset);
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ARC_DEBUG ("arc_info: PATCHED: %#08lx "
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"@ %#08lx for sym %s in got offset %#lx\n",
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(long) (reloc_data->sym_value + sec_vma),
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(long) (htab->sgot->output_section->vma
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+ htab->sgot->output_offset
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+ entry->offset),
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symbol_name,
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(long) entry->offset);
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}
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}
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break;
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default:
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BFD_ASSERT (0);
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break;
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}
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entry->processed = true;
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}
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}
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return entry->offset;
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}
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static void
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create_got_dynrelocs_for_single_entry (struct got_entry *list,
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bfd *output_bfd,
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struct bfd_link_info * info,
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struct elf_link_hash_entry *h)
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{
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if (list == NULL)
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return;
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bfd_vma got_offset = list->offset;
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if (list->type == GOT_NORMAL
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&& !list->created_dyn_relocation)
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{
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if (bfd_link_pic (info)
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&& h != NULL
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&& (info->symbolic || h->dynindx == -1)
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&& h->def_regular)
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{
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ADD_RELA (output_bfd, got, got_offset, 0, R_ARC_RELATIVE, 0);
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}
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/* Do not fully understand the side effects of this condition.
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The relocation space might still being reserved. Perhaps
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I should clear its value. */
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else if (h != NULL && h->dynindx != -1)
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{
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ADD_RELA (output_bfd, got, got_offset, h->dynindx, R_ARC_GLOB_DAT, 0);
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}
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list->created_dyn_relocation = true;
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}
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else if (list->existing_entries != TLS_GOT_NONE
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&& !list->created_dyn_relocation)
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{
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/* TODO TLS: This is not called for local symbols.
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In order to correctly implement TLS, this should also
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be called for all local symbols with tls got entries.
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Should be moved to relocate_section in order to make it
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work for local symbols. */
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struct elf_link_hash_table *htab = elf_hash_table (info);
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enum tls_got_entries e = list->existing_entries;
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BFD_ASSERT (list->type != GOT_TLS_GD
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|| list->existing_entries == TLS_GOT_MOD_AND_OFF);
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bfd_vma dynindx = (h == NULL || h->dynindx == -1) ? 0 : h->dynindx;
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if (e == TLS_GOT_MOD_AND_OFF || e == TLS_GOT_MOD)
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{
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ADD_RELA (output_bfd, got, got_offset, dynindx,
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R_ARC_TLS_DTPMOD, 0);
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ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \
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GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = 0x0\n",
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list->type,
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(long) got_offset,
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(long) (htab->sgot->output_section->vma
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+ htab->sgot->output_offset + got_offset),
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(long) dynindx);
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}
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if (e == TLS_GOT_MOD_AND_OFF || e == TLS_GOT_OFF)
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{
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bfd_vma addend = 0;
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if (list->type == GOT_TLS_IE)
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{
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addend = bfd_get_32 (output_bfd,
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htab->sgot->contents + got_offset);
|
|
}
|
|
|
|
ADD_RELA (output_bfd, got,
|
|
got_offset + (e == TLS_GOT_MOD_AND_OFF ? 4 : 0),
|
|
dynindx,
|
|
(list->type == GOT_TLS_IE ? R_ARC_TLS_TPOFF
|
|
: R_ARC_TLS_DTPOFF),
|
|
addend);
|
|
|
|
ARC_DEBUG ("arc_info: TLS_DYNRELOC: type = %d, \
|
|
GOT_OFFSET = %#lx, GOT_VMA = %#lx, INDEX = %ld, ADDEND = %#lx\n",
|
|
list->type,
|
|
(long) got_offset,
|
|
(long) (htab->sgot->output_section->vma
|
|
+ htab->sgot->output_offset + got_offset),
|
|
(long) dynindx, (long) addend);
|
|
}
|
|
list->created_dyn_relocation = true;
|
|
}
|
|
}
|
|
|
|
static void
|
|
create_got_dynrelocs_for_got_info (struct got_entry **list_p,
|
|
bfd *output_bfd,
|
|
struct bfd_link_info * info,
|
|
struct elf_link_hash_entry *h)
|
|
{
|
|
if (list_p == NULL)
|
|
return;
|
|
|
|
struct got_entry *list = *list_p;
|
|
/* Traverse the list of got entries for this symbol. */
|
|
while (list)
|
|
{
|
|
create_got_dynrelocs_for_single_entry (list, output_bfd, info, h);
|
|
list = list->next;
|
|
}
|
|
}
|
|
|
|
#undef ADD_SYMBOL_REF_SEC_AND_RELOC
|
|
|
|
#endif /* ARC_GOT_H */
|