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-rw-r--r--bfd/elf32-cris.c601
1 files changed, 601 insertions, 0 deletions
diff --git a/bfd/elf32-cris.c b/bfd/elf32-cris.c
new file mode 100644
index 0000000..54bc991
--- /dev/null
+++ b/bfd/elf32-cris.c
@@ -0,0 +1,601 @@
+/* CRIS-specific support for 32-bit ELF.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ Contributed by Axis Communications AB.
+ Written by Hans-Peter Nilsson, based on elf32-fr30.c
+
+This file is part of BFD, the Binary File Descriptor library.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/cris.h"
+
+/* Forward declarations. */
+static reloc_howto_type * cris_reloc_type_lookup
+ PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
+
+static void cris_info_to_howto_rela
+ PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
+
+static boolean cris_elf_relocate_section
+ PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
+ Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
+
+static bfd_reloc_status_type cris_final_link_relocate
+ PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
+ Elf_Internal_Rela *, bfd_vma));
+
+static boolean cris_elf_gc_sweep_hook
+ PARAMS ((bfd *, struct bfd_link_info *, asection *,
+ const Elf_Internal_Rela *));
+
+static asection * cris_elf_gc_mark_hook
+ PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
+ struct elf_link_hash_entry *, Elf_Internal_Sym *));
+
+static reloc_howto_type cris_elf_howto_table [] =
+{
+ /* This reloc does nothing. */
+ HOWTO (R_CRIS_NONE, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_NONE", /* name */
+ false, /* partial_inplace */
+ 0, /* src_mask */
+ 0, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* An 8 bit absolute relocation. */
+ HOWTO (R_CRIS_8, /* type */
+ 0, /* rightshift */
+ 0, /* size (0 = byte, 1 = short, 2 = long) */
+ 8, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_8", /* name */
+ false, /* partial_inplace */
+ 0x0000, /* src_mask */
+ 0x00ff, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* A 16 bit absolute relocation. */
+ HOWTO (R_CRIS_16, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_16", /* name */
+ false, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0x0000ffff, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* A 32 bit absolute relocation. */
+ HOWTO (R_CRIS_32, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_32", /* name */
+ false, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* An 8 bit absolute relocation. */
+ HOWTO (R_CRIS_8_PCREL, /* type */
+ 0, /* rightshift */
+ 0, /* size (0 = byte, 1 = short, 2 = long) */
+ 8, /* bitsize */
+ true, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_8_PCREL", /* name */
+ false, /* partial_inplace */
+ 0x0000, /* src_mask */
+ 0x00ff, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* A 16 bit absolute relocation. */
+ HOWTO (R_CRIS_16_PCREL, /* type */
+ 0, /* rightshift */
+ 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 16, /* bitsize */
+ true, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_16", /* name */
+ false, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0x0000ffff, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* A 32 bit absolute relocation. */
+ HOWTO (R_CRIS_32_PCREL, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 32, /* bitsize */
+ true, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_bitfield, /* complain_on_overflow */
+ bfd_elf_generic_reloc, /* special_function */
+ "R_CRIS_32", /* name */
+ false, /* partial_inplace */
+ 0x00000000, /* src_mask */
+ 0xffffffff, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* GNU extension to record C++ vtable hierarchy */
+ HOWTO (R_CRIS_GNU_VTINHERIT, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 0, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ NULL, /* special_function */
+ "R_CRIS_GNU_VTINHERIT", /* name */
+ false, /* partial_inplace */
+ 0, /* src_mask */
+ 0, /* dst_mask */
+ false), /* pcrel_offset */
+
+ /* GNU extension to record C++ vtable member usage */
+ HOWTO (R_CRIS_GNU_VTENTRY, /* type */
+ 0, /* rightshift */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
+ 0, /* bitsize */
+ false, /* pc_relative */
+ 0, /* bitpos */
+ complain_overflow_dont, /* complain_on_overflow */
+ _bfd_elf_rel_vtable_reloc_fn, /* special_function */
+ "R_CRIS_GNU_VTENTRY", /* name */
+ false, /* partial_inplace */
+ 0, /* src_mask */
+ 0, /* dst_mask */
+ false) /* pcrel_offset */
+};
+
+/* Map BFD reloc types to CRIS ELF reloc types. */
+
+struct cris_reloc_map
+{
+ bfd_reloc_code_real_type bfd_reloc_val;
+ unsigned int cris_reloc_val;
+};
+
+static const struct cris_reloc_map cris_reloc_map [] =
+{
+ { BFD_RELOC_NONE, R_CRIS_NONE },
+ { BFD_RELOC_8, R_CRIS_8 },
+ { BFD_RELOC_16, R_CRIS_16 },
+ { BFD_RELOC_32, R_CRIS_32 },
+ { BFD_RELOC_8_PCREL, R_CRIS_8_PCREL },
+ { BFD_RELOC_16_PCREL, R_CRIS_16_PCREL },
+ { BFD_RELOC_32_PCREL, R_CRIS_32_PCREL },
+ { BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT },
+ { BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }
+};
+
+static reloc_howto_type *
+cris_reloc_type_lookup (abfd, code)
+ bfd * abfd ATTRIBUTE_UNUSED;
+ bfd_reloc_code_real_type code;
+{
+ unsigned int i;
+
+ for (i = sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]);
+ --i;)
+ if (cris_reloc_map [i].bfd_reloc_val == code)
+ return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val];
+
+ return NULL;
+}
+
+/* Set the howto pointer for an CRIS ELF reloc. */
+
+static void
+cris_info_to_howto_rela (abfd, cache_ptr, dst)
+ bfd * abfd ATTRIBUTE_UNUSED;
+ arelent * cache_ptr;
+ Elf32_Internal_Rela * dst;
+{
+ unsigned int r_type;
+
+ r_type = ELF32_R_TYPE (dst->r_info);
+ BFD_ASSERT (r_type < (unsigned int) R_CRIS_max);
+ cache_ptr->howto = & cris_elf_howto_table [r_type];
+}
+
+/* Perform a single relocation. By default we use the standard BFD
+ routines, but we might have to do a few relocs ourselves in the future. */
+
+static bfd_reloc_status_type
+cris_final_link_relocate (howto, input_bfd, input_section, contents, rel,
+ relocation)
+ reloc_howto_type * howto;
+ bfd * input_bfd;
+ asection * input_section;
+ bfd_byte * contents;
+ Elf_Internal_Rela * rel;
+ bfd_vma relocation;
+{
+ bfd_reloc_status_type r
+ = _bfd_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel->r_offset,
+ relocation, rel->r_addend);
+ return r;
+}
+
+/* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
+ copied, for further comments. */
+
+static boolean
+cris_elf_relocate_section (output_bfd, info, input_bfd, input_section,
+ contents, relocs, local_syms, local_sections)
+ bfd * output_bfd ATTRIBUTE_UNUSED;
+ struct bfd_link_info * info;
+ bfd * input_bfd;
+ asection * input_section;
+ bfd_byte * contents;
+ Elf_Internal_Rela * relocs;
+ Elf_Internal_Sym * local_syms;
+ asection ** local_sections;
+{
+ Elf_Internal_Shdr * symtab_hdr;
+ struct elf_link_hash_entry ** sym_hashes;
+ Elf_Internal_Rela * rel;
+ Elf_Internal_Rela * relend;
+
+ symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (input_bfd);
+ relend = relocs + input_section->reloc_count;
+
+ /* It seems this can happen with erroneous or unsupported input (mixing
+ a.out and elf in an archive, for example.) */
+ if (sym_hashes == NULL)
+ return false;
+
+ for (rel = relocs; rel < relend; rel ++)
+ {
+ reloc_howto_type * howto;
+ unsigned long r_symndx;
+ Elf_Internal_Sym * sym;
+ asection * sec;
+ struct elf_link_hash_entry * h;
+ bfd_vma relocation;
+ bfd_reloc_status_type r;
+ const char * name = NULL;
+ int r_type;
+
+ r_type = ELF32_R_TYPE (rel->r_info);
+
+ if ( r_type == R_CRIS_GNU_VTINHERIT
+ || r_type == R_CRIS_GNU_VTENTRY)
+ continue;
+
+ r_symndx = ELF32_R_SYM (rel->r_info);
+
+ if (info->relocateable)
+ {
+ /* This is a relocateable link. We don't have to change
+ anything, unless the reloc is against a section symbol,
+ in which case we have to adjust according to where the
+ section symbol winds up in the output section. */
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+
+ if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
+ {
+ sec = local_sections [r_symndx];
+ rel->r_addend += sec->output_offset + sym->st_value;
+ }
+ }
+
+ continue;
+ }
+
+ /* This is a final link. */
+ howto = cris_elf_howto_table + ELF32_R_TYPE (rel->r_info);
+ h = NULL;
+ sym = NULL;
+ sec = NULL;
+
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+ sec = local_sections [r_symndx];
+ relocation = (sec->output_section->vma
+ + sec->output_offset
+ + sym->st_value);
+
+ name = bfd_elf_string_from_elf_section
+ (input_bfd, symtab_hdr->sh_link, sym->st_name);
+ name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
+#if 0
+ fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n",
+ sec->name, name, sym->st_name,
+ sec->output_section->vma, sec->output_offset,
+ sym->st_value, rel->r_addend);
+#endif
+ }
+ else
+ {
+ h = sym_hashes [r_symndx - symtab_hdr->sh_info];
+
+ while (h->root.type == bfd_link_hash_indirect
+ || h->root.type == bfd_link_hash_warning)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+ name = h->root.root.string;
+
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ {
+ sec = h->root.u.def.section;
+ relocation = (h->root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset);
+#if 0
+ fprintf (stderr,
+ "defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n",
+ sec->name, name, h->root.u.def.value,
+ sec->output_section->vma, sec->output_offset, relocation);
+#endif
+ }
+ else if (h->root.type == bfd_link_hash_undefweak)
+ {
+#if 0
+ fprintf (stderr, "undefined: sec: %s, name: %s\n",
+ sec->name, name);
+#endif
+ relocation = 0;
+ }
+ else if (info->shared
+ && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
+ relocation = 0;
+ else
+ {
+ if (! ((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd,
+ input_section, rel->r_offset, true)))
+ return false;
+#if 0
+ fprintf (stderr, "unknown: name: %s\n", name);
+#endif
+ relocation = 0;
+ }
+ }
+
+ r = cris_final_link_relocate (howto, input_bfd, input_section,
+ contents, rel, relocation);
+
+ if (r != bfd_reloc_ok)
+ {
+ const char * msg = (const char *) NULL;
+
+ switch (r)
+ {
+ case bfd_reloc_overflow:
+ r = info->callbacks->reloc_overflow
+ (info, name, howto->name, (bfd_vma) 0,
+ input_bfd, input_section, rel->r_offset);
+ break;
+
+ case bfd_reloc_undefined:
+ r = info->callbacks->undefined_symbol
+ (info, name, input_bfd, input_section, rel->r_offset,
+ true);
+ break;
+
+ case bfd_reloc_outofrange:
+ msg = _("internal error: out of range error");
+ break;
+
+ case bfd_reloc_notsupported:
+ msg = _("internal error: unsupported relocation error");
+ break;
+
+ case bfd_reloc_dangerous:
+ msg = _("internal error: dangerous relocation");
+ break;
+
+ default:
+ msg = _("internal error: unknown error");
+ break;
+ }
+
+ if (msg)
+ r = info->callbacks->warning
+ (info, msg, name, input_bfd, input_section, rel->r_offset);
+
+ if (! r)
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/* Return the section that should be marked against GC for a given
+ relocation. */
+
+static asection *
+cris_elf_gc_mark_hook (abfd, info, rel, h, sym)
+ bfd * abfd;
+ struct bfd_link_info * info ATTRIBUTE_UNUSED;
+ Elf_Internal_Rela * rel;
+ struct elf_link_hash_entry * h;
+ Elf_Internal_Sym * sym;
+{
+ if (h != NULL)
+ {
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ case R_CRIS_GNU_VTINHERIT:
+ case R_CRIS_GNU_VTENTRY:
+ break;
+
+ default:
+ switch (h->root.type)
+ {
+ case bfd_link_hash_defined:
+ case bfd_link_hash_defweak:
+ return h->root.u.def.section;
+
+ case bfd_link_hash_common:
+ return h->root.u.c.p->section;
+
+ default:
+ break;
+ }
+ }
+ }
+ else
+ {
+ if (!(elf_bad_symtab (abfd)
+ && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
+ && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
+ && sym->st_shndx != SHN_COMMON))
+ {
+ return bfd_section_from_elf_index (abfd, sym->st_shndx);
+ }
+ }
+
+ return NULL;
+}
+
+/* Update the got entry reference counts for the section being removed. */
+
+static boolean
+cris_elf_gc_sweep_hook (abfd, info, sec, relocs)
+ bfd * abfd ATTRIBUTE_UNUSED;
+ struct bfd_link_info * info ATTRIBUTE_UNUSED;
+ asection * sec ATTRIBUTE_UNUSED;
+ const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
+{
+ return true;
+}
+
+/* Look through the relocs for a section during the first phase.
+ Since we don't do .gots or .plts, we just need to consider the
+ virtual table relocs for gc. */
+
+static boolean
+cris_elf_check_relocs (abfd, info, sec, relocs)
+ bfd *abfd;
+ struct bfd_link_info *info;
+ asection *sec;
+ const Elf_Internal_Rela *relocs;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
+
+ if (info->relocateable)
+ return true;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof(Elf32_External_Sym);
+ if (!elf_bad_symtab (abfd))
+ sym_hashes_end -= symtab_hdr->sh_info;
+
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
+ {
+ struct elf_link_hash_entry *h;
+ unsigned long r_symndx;
+
+ r_symndx = ELF32_R_SYM (rel->r_info);
+ if (r_symndx < symtab_hdr->sh_info)
+ h = NULL;
+ else
+ h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ /* This relocation describes the C++ object vtable hierarchy.
+ Reconstruct it for later use during GC. */
+ case R_CRIS_GNU_VTINHERIT:
+ if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
+ return false;
+ break;
+
+ /* This relocation describes which C++ vtable entries are actually
+ used. Record for later use during GC. */
+ case R_CRIS_GNU_VTENTRY:
+ if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ return false;
+ break;
+ }
+ }
+
+ return true;
+}
+
+#define ELF_ARCH bfd_arch_cris
+#define ELF_MACHINE_CODE EM_CRIS
+#define ELF_MAXPAGESIZE 0x2000
+
+#define TARGET_LITTLE_SYM bfd_elf32_cris_vec
+#define TARGET_LITTLE_NAME "elf32-cris"
+
+/* For the time being, we have a leading underscore. Perhaps change to 0
+ later, when
+ 1) a.out isn't as dominating, and we can forget about multiformat links
+ and old assembly code.
+ 2) there's an official solution to the symbol vs. register duality
+ problem; perhaps a % register prefix, optionally enforced. */
+#define elf_symbol_leading_char '_'
+
+#define elf_info_to_howto_rel NULL
+#define elf_info_to_howto cris_info_to_howto_rela
+#define elf_backend_relocate_section cris_elf_relocate_section
+#define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
+#define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
+#define elf_backend_check_relocs cris_elf_check_relocs
+
+#define elf_backend_can_gc_sections 1
+
+#define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
+
+/* Later, we my want to optimize RELA entries into REL entries for dynamic
+ linking and libraries (if it's a win of any significance). Until then,
+ take the easy route. */
+#define elf_backend_may_use_rel_p 0
+#define elf_backend_may_use_rela_p 1
+
+#include "elf32-target.h"
generated by cgit v1.1 at 2024-11-25 22:30:18 +0000